Stroke conversion structure

Abstract

The utility model discloses a stroke conversion structure which comprises an electric actuating mechanism, a mounting plate, a connecting piece, a guide rod and a valve rod connecting shaft, a guide rod is fixedly mounted on the side, away from the electric actuating mechanism, of the mounting plate; an external thread structure I is formed on an output shaft of the actuating mechanism; the valve rod connecting shaft is provided with an external thread structure II; a screw hole I and a screw hole II which are coaxial and located at the two ends of the connecting piece respectively are formed in the connecting piece, an internal thread structure I matched with the external thread structure I is formed in the screw hole I, an internal thread structure II matched with the external thread structure II is formed in the screw hole II, and a penetrating guide hole matched with the guide rod is formed in the connecting piece; an output shaft of the executing mechanism and a valve rod connecting shaft are in threaded connection with the screw hole I and the screw hole II respectively, and the guide rod is inserted into the penetrating guide hole. The stroke conversion structure is low in cost, compact in structure, ingenious in design and capable of well achieving stroke conversion of a multi-rotation electric actuating mechanism and a straight stroke valve.

Description

Technical Field

[0001] The utility model relates to the technical field of control valves, in particular to a stroke conversion structure, in particular to a stroke conversion structure for a multi-rotation electric actuator to a linear stroke valve body. Background Art

[0002] The electric control valve consists of an electric actuator and a valve body. Electric actuators are available in angular stroke, linear stroke, multi-turn, and partial-turn types, and valve bodies are available in angular stroke and linear stroke types. Usually, a linear stroke valve body is equipped with a linear stroke electric actuator, or a multi-turn electric actuator. When a linear stroke valve body is equipped with a multi-turn electric actuator, it is necessary to convert the rotation of the actuator output shaft into the up and down movement of the valve stem. The commonly used method at present is to achieve the conversion through the form of bearing + threaded sleeve. The rotation of the threaded sleeve drives the valve stem to move. This conversion device is relatively large in size and has a high cost.

[0003] Therefore, it is of great practical significance to develop a travel conversion structure for a multi-turn electric actuator to a linear travel valve body that is compact, ingeniously designed and low-cost. Utility Model Content

[0004] Due to the above-mentioned defects in the prior art, the utility model provides a stroke conversion structure of a multi-turn electric actuator to a linear stroke valve body with a compact structure, ingenious design and low cost, which solves the defects of the existing stroke conversion structure of a multi-turn electric actuator to a linear stroke valve body with large size and high cost.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A stroke conversion structure includes an electric actuator, a mounting plate, a connecting piece, a guide rod and a valve stem connecting shaft;

[0007] The mounting plate is mounted on the electric actuator, a guide rod is fixedly mounted on the mounting plate away from the electric actuator, and an external thread structure I is formed on the actuator output shaft of the electric actuator;

[0008] The valve stem connecting shaft is provided with an external thread structure II;

[0009] The connector is provided with a coaxial screw hole I and a screw hole II respectively located at two ends of the connector, the screw hole I is provided with an internal screw structure I matching the external screw structure I, the screw hole II is provided with an internal screw structure II matching the external screw structure II, and the connector is also provided with a through guide hole matching the guide rod;

[0010] The output shaft of the actuator is threadedly connected to the screw hole I, the guide rod is inserted into the through guide hole, and the valve stem connecting shaft is threadedly connected to the screw hole II.

[0011] The action flow of the above stroke conversion structure is as follows:

[0012] When the electric actuator is actuated, the actuator output shaft will rotate. If there is no guide rod, the connecting piece will rotate with the actuator output shaft and cannot drive the valve stem connecting shaft to move up and down. After the guide rod is installed, the connecting piece cannot rotate with the actuator output shaft, but moves up and down with the rotation of the actuator output shaft, driving the valve stem connecting shaft to move up and down. The valve stem connecting shaft is connected to the valve stem, and the valve stem also moves up and down, thereby successfully converting the rotation of the actuator into the up and down movement of the valve stem.

[0013] The stroke conversion structure of the utility model has a simple overall structure, relatively low cost, compact structure and ingenious design, can well realize the stroke conversion of multi-turn electric actuator and linear stroke valve, has a small overall volume, is particularly suitable for the connection between small thrust multi-turn electric actuator and linear stroke valve, has good application effect and good application prospect.

[0014] As the preferred technical solution:

[0015] In the stroke conversion structure as described above, the screw hole I and the screw hole II are through holes that are interconnected.

[0016] In the stroke conversion structure as described above, the inner diameters of the through holes at various positions are the same.

[0017] In the stroke conversion structure as described above, the mounting plate is fixed on the mounting rod.

[0018] In the stroke conversion structure as described above, there are two mounting rods in total and the two mounting rods are respectively located on two sides of the mounting plate.

[0019] In the stroke conversion structure as described above, the installation rod is provided with a stroke scale sleeve, and the stroke scale sleeve is provided with stroke scale lines along the length direction of the installation rod;

[0020] A travel pointer matching the travel scale sleeve is fixed on the connecting piece, and the travel progress can be obtained in real time through the travel pointer.

[0021] In the stroke conversion structure as described above, the guide rod is threadedly connected to the mounting plate and is locked with thread glue.

[0022] In the stroke conversion structure as described above, the valve stem connecting shaft is connected to the valve stem at the end having the external thread structure II away from the valve stem.

[0023] The above technical solution is only a feasible technical solution of the present utility model, and the protection scope of the present utility model is not limited thereto. Those skilled in the art can reasonably adjust the specific design according to actual needs.

[0024] The above utility model has the following advantages or beneficial effects:

[0025] (1) The stroke conversion structure of the utility model has a simple overall structure and relatively low cost;

[0026] (2) The stroke conversion structure of the utility model is compact and ingeniously designed. It can well realize the stroke conversion of multi-turn electric actuators and linear stroke valves. The overall volume is small and it is particularly suitable for the connection between small-thrust multi-turn electric actuators and linear stroke valves. It has good application effect and good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention and its features, appearance and advantages will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings. The same reference numerals indicate the same parts in all the drawings. The drawings are not drawn to scale, and the emphasis is on illustrating the subject matter of the present invention.

[0028] Figure 1 It is a schematic diagram of the stroke conversion structure of the utility model;

[0029] Among them, 1 is an electric actuator, 2 is an actuator output shaft, 3 is a connecting piece, 4 is a mounting plate, 5 is a mounting rod, 6 is a guide rod, 7 is a valve stem connecting shaft, 8 is a travel scale sleeve, and 9 is a travel pointer. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0031] Example 1

[0032] A stroke conversion structure, such as Figure 1 As shown, it includes an electric actuator 1, a mounting plate 4, a connecting piece 3, a guide rod 6 and a valve stem connecting shaft 7;

[0033] The mounting plate 4 is installed below the electric actuator 1, and a guide rod 6 is fixedly installed on the mounting plate 4 away from the electric actuator 1 (the guide rod 6 is threadedly connected to the mounting plate 4 and locked with thread glue), the mounting plate 4 is fixed on two mounting rods 5, and the two mounting rods 5 (the mounting rod 5 and the guide rod 6 are located on the same side of the mounting plate 4) are respectively located on both sides of the mounting plate 4, and a travel scale sleeve 8 is sleeved on the mounting rod 5, and the travel scale sleeve 8 is provided with travel scale lines along the length direction of the mounting rod 5, and an external thread structure I is opened on the actuator output shaft 2 of the electric actuator 1;

[0034] The valve stem connecting shaft 7 is provided with an external thread structure II, and the valve stem connecting shaft 7 is connected to the valve stem at an end away from the external thread structure II;

[0035] The connecting member 3 is provided with a coaxial screw hole I and a screw hole II respectively located at both ends of the connecting member, the screw hole I and the screw hole II are through holes that are interconnected and have the same inner diameter at each position, the screw hole I is provided with an internal thread structure I that matches the external thread structure I, the screw hole II is provided with an internal thread structure II that matches the external thread structure II, the connecting member 3 is also provided with a through guide hole that matches the guide rod 6, and a travel pointer 9 that matches the travel scale sleeve 8 is fixed on the connecting member 3;

[0036] The output shaft 2 of the actuator is threadedly connected to the screw hole I, the guide rod 6 is inserted into the penetrating guide hole, and the valve stem connecting shaft 7 is threadedly connected to the screw hole II.

[0037] It has been verified that the stroke conversion structure of the utility model has a simple overall structure, relatively low cost, compact structure and ingenious design, can well realize the stroke conversion of multi-turn electric actuators and linear stroke valves, has a small overall volume, and is particularly suitable for the connection between small-thrust multi-turn electric actuators and linear stroke valves, has good application effect and good application prospects.

[0038] Those skilled in the art should understand that those skilled in the art can implement variations by combining the prior art and the above embodiments, which will not be described in detail here. Such variations do not affect the essential content of the present utility model, and will not be described in detail here.

[0039] The above describes the preferred embodiments of the utility model. It should be understood that the utility model is not limited to the above-mentioned specific implementation methods, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the utility model without departing from the scope of the technical solution of the utility model, or modify them into equivalent embodiments of equivalent changes, which does not affect the essential content of the utility model. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the utility model without departing from the content of the technical solution of the utility model still falls within the scope of protection of the technical solution of the utility model.

Claims

1. A stroke conversion structure, characterized in that: It includes an electric actuator, a mounting plate, a connecting piece, a guide rod and a valve stem connecting shaft; The mounting plate is mounted on the electric actuator, a guide rod is fixedly mounted on the mounting plate away from the electric actuator, and an external thread structure I is formed on the actuator output shaft of the electric actuator; The valve stem connecting shaft is provided with an external thread structure II; The connector is provided with a coaxial screw hole I and a screw hole II respectively located at two ends of the connector, the screw hole I is provided with an internal screw structure I matching the external screw structure I, the screw hole II is provided with an internal screw structure II matching the external screw structure II, and the connector is also provided with a through guide hole matching the guide rod; The output shaft of the actuator is threadedly connected to the screw hole I, the guide rod is inserted into the through guide hole, and the valve stem connecting shaft is threadedly connected to the screw hole II.

2. A stroke conversion structure according to claim 1, characterized in that: The screw hole I and the screw hole II are through holes connected to each other.

3. A stroke conversion structure according to claim 2, characterized in that: The inner diameters of the through holes at various positions are the same.

4. A stroke conversion structure according to claim 1, characterized in that: The mounting plate is fixed on the mounting rod.

5. A stroke conversion structure according to claim 4, characterized in that: There are two mounting rods in total and the two mounting rods are respectively located on two sides of the mounting plate.

6. A stroke conversion structure according to claim 4, characterized in that: The installation rod is sleeved with a travel scale sleeve, and the travel scale sleeve is provided with travel scale lines along the length direction of the installation rod; A travel pointer matching the travel scale sleeve is fixed on the connecting piece.

7. A stroke conversion structure according to claim 1, characterized in that: The guide rod is threadedly connected to the mounting plate and is locked with thread glue.

8. A stroke conversion structure according to claim 1, characterized in that: The valve stem connecting shaft is connected to the valve stem at an end far away from the external thread structure II.

Images