Valve power conversion mechanism

Abstract

This application relates to the field of valve technology, and more particularly to a power conversion mechanism for valves. It includes a support assembly, a ball screw pair, a power input shaft, a power output shaft, and a guide member. The support assembly has an axially open mounting channel at both ends. The ball screw pair includes a ball screw and a ball nut that mates with the ball screw. The ball nut is rotatably disposed within the mounting channel. The power output shaft is inserted into the mounting channel from one end and fixedly connected to the ball nut. The power output shaft is also inserted into the mounting channel from the other end and fixedly connected to the ball screw. The support assembly has an axially oriented guide groove, and the guide member is slidably disposed within the guide groove and fixedly connected to the power output shaft. The ball screw pair has low friction and high mechanical transmission efficiency. The cooperation of the guide member and the guide groove prevents rotation of the power output shaft, thereby improving the displacement control accuracy of the power output shaft.

Description

Technical Field

[0001] This application relates to the field of valve technology, and in particular to a power conversion mechanism for valves. Background Technology

[0002] In recent years, with the continuous development of modernization, valve technology also needs to adapt to the development of new products, especially valve control actuators for pipeline transportation stations for special goods such as natural gas and oil, which need to have the performance to withstand harsh working conditions.

[0003] Existing actuators mostly use trapezoidal threaded lead screws as power transmission mechanisms in the valve switching process. These are often manufactured using rough machining methods, resulting in low mechanical transmission efficiency due to the trapezoidal thread itself. This leads to frequent damage to the mating nuts and increased clearance. Consequently, the required power of the electric actuator increases, and the control displacement accuracy remains low. Therefore, the industry urgently needs a high-efficiency, durable, and high-precision power conversion mechanism to replace existing actuators. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this application provides a power conversion structure for valves.

[0005] This application provides a power conversion mechanism for valves, including a support assembly, a ball screw pair, a power input shaft, a power output shaft, and a guide member. The support assembly has an axially open mounting channel. The ball screw pair includes a ball screw and a ball nut that mates with the ball screw. The ball nut is rotatably disposed within the mounting channel. The power output shaft is inserted into the mounting channel from the first end and fixedly connected to the ball nut. The power output shaft is inserted into the mounting channel from the second end and fixedly connected to the ball screw. The support assembly has an axially oriented guide groove. The guide member is slidably disposed within the guide groove and fixedly connected to the power output shaft.

[0006] In some embodiments, a limiting mechanism is further included, which is connected between the ball screw nut and the support assembly to limit the axial movement of the ball screw nut.

[0007] In some embodiments, the mounting channel sequentially includes a first channel segment, a second channel segment, and a third channel segment from the first end to the second end. The diameter of the second channel segment is larger than the diameters of the first channel segment and the third channel segment. A first stepped surface is formed between the second channel segment and the first channel segment, and a second stepped surface is formed between the second channel segment and the third channel segment. The outer surface of the ball screw nut is provided with a first flange, which is located between the first stepped surface and the second stepped surface. The limiting mechanism includes two thrust bearings, which are respectively installed between the first flange and the first stepped surface and between the first flange and the second stepped surface.

[0008] In some embodiments, the support assembly includes a support body and a connecting seat that are connected to each other. The support body is provided with a second flange, and the connecting seat is provided with a third flange. The third flange is fixedly connected to the second flange, and the second channel segment is distributed on the connecting seat and the support body.

[0009] In some embodiments, the power output shaft is provided with a first mounting hole along the axial direction, and the ball screw passes through the first mounting hole and is fixed by a fastening screw.

[0010] In some embodiments, the guide includes a first screw, the power output shaft has a first fixing hole, the ball screw has a second fixing hole, the second fixing hole is corresponding to the first fixing hole, and the first screw passes through the guide groove and the first fixing hole in sequence and then connects to the second fixing hole.

[0011] In some embodiments, the guide further includes a roller sleeve rotatably disposed on the first screw and located within the guide groove.

[0012] In some embodiments, a positioning ring is further included, one end of which abuts against the second stepped surface and the other end of which abuts against the thrust bearing, and the ball nut rotatably passes through the positioning ring.

[0013] In some embodiments, a second mounting hole is provided along the axial direction of the power input shaft, and the end of the ball screw away from the power output shaft passes through the second mounting hole.

[0014] In some embodiments, the end of the power output shaft away from the ball screw is used to connect to the valve stem.

[0015] The technical solution provided in this application has the following advantages compared with the prior art:

[0016] The power conversion mechanism for valves provided in this application converts the rotary motion of the ball screw nut into the linear motion of the ball screw through the cooperation of the ball screw and ball nut. The friction of the ball screw pair is small, resulting in high mechanical transmission efficiency. The power output shaft is fixedly connected to the ball screw, and the movement path of the power output shaft is limited by the cooperation of the guide member and guide groove, preventing the power output shaft from rotating and thus improving the displacement control accuracy of the power output shaft. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a cross-sectional view of the power conversion mechanism for the valve described in the embodiment of this application;

[0020] Figure 2 for Figure 1 A magnified view of point A in the middle;

[0021] Figure 3 This is a schematic diagram of the power conversion mechanism for valves described in the embodiments of this application.

[0022] Among them, 1. support assembly; 11. support body; 12. connecting seat; 111. guide groove;

[0023] 2. Ball screw nut; 3. Ball screw; 4. Power input shaft; 5. Power output shaft; 6. Fastening screw; 7. First screw; 8. Roller sleeve; 9. Locating ring; 10. Thrust bearing. Detailed Implementation

[0024] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0025] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0026] like Figures 1 to 3As shown, this application embodiment provides a power conversion mechanism for a valve, including a bracket assembly 1, three sets of ball screws, a power input shaft 4, a power output shaft 5, and a guide member. The bracket assembly 1 is provided with an axially open mounting channel. The three sets of ball screws include a ball screw 3 and a ball nut 2 that cooperates with the ball screw 3. The ball nut 2 is rotatably disposed in the mounting channel. The power output shaft 5 is inserted into the mounting channel from the first end of the mounting channel and fixedly connected to the ball nut 2. The power output shaft 5 is inserted into the mounting channel from the second end of the mounting channel and fixedly connected to the ball screw 3. The bracket assembly 1 is provided with an axially arranged guide groove 111. The guide member is slidably disposed in the guide groove 111 and fixedly connected to the power output shaft 5.

[0027] Specifically, the two open ends of the installation channel are the first end and the second end, as follows: Figure 1 The upper end of the mounting channel is the first end, and the lower end is the second end. The ball screw 3 is located in the mounting channel. The ball nut 2 is rotatably mounted in the mounting channel near the first end of the mounting channel. The ball screw 3 passes through the ball nut 2 and cooperates with the ball nut 2. When the ball nut 2 rotates, it can drive the ball screw 3 to move linearly along the axial direction. The power input shaft 4 is inserted into the mounting channel from the first end of the mounting channel and is fixedly connected to the ball nut 2. The end of the power input shaft 4 away from the ball nut 2 is connected to the power source so as to drive the ball nut 2 to rotate with the power input shaft 4.

[0028] The power output shaft 5 is inserted into the mounting channel from the second end of the mounting channel and fixedly connected to the ball screw 3, moving synchronously with the ball screw 3. The guide member cooperates with the guide groove 111, restricting the movement path of the power output shaft 5, so that the power output shaft 5 can only move axially and cannot rotate circumferentially.

[0029] The power conversion mechanism for valves provided in this application converts the rotary motion of the ball screw nut 2 into the linear motion of the ball screw 3 through the cooperation of the ball screw 3 and the ball screw nut 2. The friction of the ball screw 3 pair is small, resulting in high mechanical transmission efficiency. The power output shaft 5 is fixedly connected to the ball screw 3, and the movement path of the power output shaft 5 is limited by the cooperation of the guide member and the guide groove 111, preventing the power output shaft 5 from rotating, thereby improving the displacement control accuracy of the power output shaft 5.

[0030] In some embodiments of this application, the power conversion mechanism for the valve further includes a limiting mechanism. The limiting structure is connected between the ball screw nut 2 and the support assembly 1 to restrict the axial movement of the ball screw nut 2. That is, the ball screw nut 2 can only rotate circumferentially and cannot move circumferentially, thus avoiding the problem of the ball screw nut 2 moving axially and affecting the valve control accuracy.

[0031] Specifically, in some embodiments of this application, the limiting mechanism includes a thrust bearing 10, which limits the ball screw nut 2 on both sides of the axial direction to prevent the ball screw nut 2 from moving axially.

[0032] The mounting channel, from the first end to the second end, includes a first channel segment, a second channel segment, and a third channel segment arranged sequentially. The diameter of the second channel segment is larger than the diameters of the first and third channel segments. In other words, the diameter of the second channel segment located between the first and third channel segments is larger than the diameters of both the first and third channel segments on either side. A first stepped surface is formed between the second and first channel segments, and a second stepped surface is formed between the third and second channel segments. The outer surface of the ball screw nut 2 is provided with a first flange, located between the first and second stepped surfaces. Two thrust bearings 10 are provided. The first flange has two sides arranged along the axial direction of the mounting channel, namely a first side and a second side. The first side is opposite to the first stepped surface, and the second side is opposite to the second stepped surface. The two thrust bearings 10 are respectively located between the first side and the first stepped surface, and between the second side and the second stepped surface. The thrust bearings 10 cooperate with the first flange, the first stepped surface, and the second stepped surface to fix the ball screw nut 2 axially, preventing axial movement of the ball screw nut 2.

[0033] Furthermore, in some embodiments of this application, the support assembly 1 includes a support body 11 and a connecting seat 12 connected to each other. The support body 11 is provided with a second flange, and the connecting seat 12 is provided with a third flange. The third flange is fixedly connected to the second flange, and a second channel section is respectively located on the connecting seat 12 and the support body 11. Disconnecting the support assembly 1 from the second channel section facilitates the installation of the ball screw 3 sets and the thrust bearing 10.

[0034] Specifically, the connecting seat 12 is provided with a first channel section and a part of the second channel section, and the bracket body 11 is provided with another part of the second channel section and a third channel section. The connecting seat 12 and the bracket body 11 are fixed together by the second flange and the third flange.

[0035] In some embodiments of this application, the power output shaft 5 is provided with a first mounting hole along the axial direction, and the ball screw 3 passes through the first mounting hole. Specifically, as shown... Figure 1 As shown, the lower end of the ball screw 3 passes through the upper end of the first mounting hole, which is used to mount the valve stem. The upper end of the first mounting hole may have an internal thread to engage with the external thread on the ball screw 3. The power output shaft 5 is fixed to the ball screw 3 by rotation. The ball screw 3 and the power output shaft 5 are fixed together by fastening screws 6, allowing them to move synchronously.

[0036] like Figure 2 and Figure 3 As shown, in some embodiments of this application, the guide includes a first screw 7, a first fixing hole on the power output shaft 5, and a second fixing hole on the ball screw 3. The second fixing hole corresponds to the first fixing hole. The first screw 7 passes through the guide groove 111 and the first fixing hole in sequence and then connects to the second fixing hole. Specifically, the screw head of the first screw 7 is located outside the guide groove 111. The first screw 7 is fixed on the power output shaft 5 by cooperating with the first fixing hole or the second fixing hole, and moves synchronously with the power output shaft 5. The guide groove 111 serves as a guide for the power output shaft 5, preventing the power output shaft 5 from rotating circumferentially.

[0037] In some embodiments of this application, the guide further includes a roller sleeve 8, which is rotatably disposed on the first screw 7 and located in the guide groove 111. The roller sleeve 8 is rotatably disposed between the first screw 7 and the guide groove 111, thereby reducing the friction between the guide and the guide groove 111.

[0038] In some embodiments of this application, the power conversion mechanism for the valve further includes a positioning ring 9, one end of which abuts against the second stepped surface, and the other end abuts against the thrust bearing 10. The ball nut 2 rotatably passes through the positioning ring 9. The positioning ring 9 can be selected for installation according to actual needs. The main function of the positioning ring 9 is to fill the gap between the thrust bearing 10 and the second stepped surface.

[0039] In some embodiments of this application, the power input shaft 4 is provided with a second mounting hole along the axial direction, and the end of the ball screw 3 away from the power output shaft 5 passes through the second mounting hole. The lower end of the power input shaft 4 is provided with a shoulder. The power input shaft 4 is installed into the mounting channel from the lower end of the connecting seat 12. The power output shaft 5 passes through the first channel section, and the shoulder is located in the second channel section and cannot pass through the first channel section. The lower surface of the shoulder is in contact with the first side of the first flange, and the thrust bearing 10 is located between the upper surface of the shoulder and the first stepped surface.

[0040] In summary, the power conversion mechanism for valves provided in this application embodiment uses three sets of ball screws, which improves the overall positioning accuracy of the valve, reduces the power required for the power source, and lowers the overall manufacturing cost of the valve.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0042] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power conversion mechanism for a valve, characterized by comprising: The device includes a bracket assembly, a ball screw pair, a power input shaft, a power output shaft, and a guide member. The bracket assembly has an axially open mounting channel. The ball screw pair includes a ball screw and a ball nut that mates with the ball screw. The ball nut is rotatably disposed within the mounting channel. The power input shaft is inserted into the mounting channel from the first end and fixedly connected to the ball nut. The power output shaft is inserted into the mounting channel from the second end and fixedly connected to the ball screw. The bracket assembly has an axially oriented guide groove. The guide member is slidably disposed within the guide groove and fixedly connected to the power output shaft.

2. The power conversion mechanism for a valve according to claim 1, characterized by It also includes a limiting mechanism connected between the ball screw nut and the support assembly, which is used to limit the axial movement of the ball screw nut.

3. The power conversion mechanism for a valve according to claim 2, characterized by The installation channel includes a first channel segment, a second channel segment, and a third channel segment sequentially from the first end to the second end. The diameter of the second channel segment is larger than the diameters of the first channel segment and the third channel segment. A first stepped surface is formed between the second channel segment and the first channel segment, and a second stepped surface is formed between the second channel segment and the third channel segment. The outer surface of the ball screw nut is provided with a first flange, which is located between the first stepped surface and the second stepped surface. The limiting mechanism includes two thrust bearings, which are respectively installed between the first flange and the first stepped surface and between the first flange and the second stepped surface.

4. The power conversion mechanism for a valve according to claim 3, characterized by The support assembly includes a support body and a connecting seat that are connected to each other. The support body is provided with a second flange, and the connecting seat is provided with a third flange. The third flange is fixedly connected to the second flange, and the second channel segment is distributed on the connecting seat and the support body.

5. The power conversion mechanism for a valve according to claim 1, characterized by The power output shaft is provided with a first mounting hole along the axial direction, and the ball screw passes through the first mounting hole and is fixed by a fastening screw.

6. The power conversion mechanism for a valve according to claim 5, characterized by The guide includes a first screw, a first fixing hole on the power output shaft, and a second fixing hole on the ball screw. The second fixing hole corresponds to the first fixing hole, and the first screw passes through the guide groove and the first fixing hole in sequence before connecting to the second fixing hole.

7. The power conversion mechanism for a valve according to claim 6, characterized by The guide also includes a roller sleeve, which is rotatably mounted on the first screw and located within the guide groove.

8. The power conversion mechanism for a valve according to claim 3, characterized by It also includes a positioning ring, one end of which abuts against the second stepped surface and the other end of which abuts against the thrust bearing, and the ball nut rotatably passes through the positioning ring.

9. The power conversion mechanism for a valve according to claim 1, characterized by A second mounting hole is provided along the axial direction of the power input shaft, and the end of the ball screw away from the power output shaft passes through the second mounting hole.

10. The power conversion mechanism for a valve according to claim 1, characterized by The end of the power output shaft away from the ball screw is used to connect to the valve stem.

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