Electric actuator capable of preventing valve rod from being suspended

Abstract

The utility model discloses an electric actuator for preventing a valve rod from being suspended, relates to the field of electric actuators, and solves the problem that the structure is unreliable when the actuator and a valve are suspended. The edge of the top end of the heightening cylinder is hinged to the flange plate so that the heightening cylinder can be arranged between the flange plate and the top end flange in a turnover mode, a containing cavity allowing the valve rod to penetrate through is formed in the center of the heightening cylinder, and the top end and the bottom end of the heightening cylinder are provided with a top connecting part and a bottom connecting part respectively. And the top connecting part and the bottom connecting part are fixedly connected with the flange plate and the top end flange respectively after the heightening cylinder is turned over. The turnover heightening cylinder is arranged on the flange plate, the installation distance between the actuator and the valve can be compensated according to actual needs, it is ensured that the actuator and the valve are tightly connected, the problem of suspension caused by the fact that a valve rod is too long is solved, and the installation stability and reliability are improved; extra torque generated by the valve rod due to the fact that the valve rod bears the weight of the actuator is reduced, and therefore the problem that the valve rod is deformed or fractured due to long-term pressure bearing is avoided.

Description

Technical Field

[0001] The utility model relates to the field of electric valve actuators, in particular to an electric actuator capable of preventing a valve stem from being suspended in the air. Background Art

[0002] Electric actuators are an indispensable component of industrial automation control systems and are widely used in a variety of fields, including petroleum, chemical, power, and water treatment. Their primary function is to convert electrical energy into mechanical energy to drive valves or other devices, achieving precise control of fluid flow, pressure, and other parameters. However, in practical applications, installation issues arise. For example, since valves and actuators are typically manufactured by different manufacturers, mismatches can occur. Mismatched mounting distances between valves and actuators are common, especially in the case of long valve stems. This can easily lead to overhangs between the actuator and valve, compromising installation stability and reliability. Furthermore, when the valve stem length exceeds a certain limit, the weight of the actuator places additional torque on the stem, causing excessive stress on the stem. This can lead to long-term deformation or even fracture, impacting valve function and service life. Summary of the Invention

[0003] The purpose of the utility model is to overcome the defects of the prior art, provide an electric actuator that can prevent the valve stem from hanging in the air, and solve the problem of structural unreliability caused by hanging between the actuator and the valve.

[0004] The technical solution of the present utility model includes a shell and a flange connected to the valve, the valve includes a valve stem and a top flange, a movable raising cylinder is provided on the flange, the top edge of the raising cylinder is hinged to the flange so that the raising cylinder can be flipped and placed between the flange and the top flange, and a cavity for the valve stem to pass through is formed at the center of the raising cylinder, the top and bottom ends of the raising cylinder respectively have a top connecting part and a bottom connecting part, and the top connecting part and the bottom connecting part are fixedly connected to the flange and the top flange respectively after the raising cylinder is flipped.

[0005] By adopting the above technical solution, a reversible spacer is set on the flange, and the installation distance between the actuator and the valve can be compensated according to actual needs, ensuring that the actuator and the valve are tightly connected, eliminating the problem of suspension caused by the valve stem being too long, and improving the stability and reliability of the installation; the valve stem can pass through the cavity of the spacer, avoiding the situation where the gravity of the actuator directly acts on the valve stem, reducing the additional torque generated by the valve stem due to the weight of the actuator, thereby avoiding the deformation or breakage of the valve stem due to long-term pressure, and extending the service life of the valve.

[0006] In a possible design, the raising cylinder includes two semi-circular cylinders that can form a full circle. When the two semi-circular cylinders are combined, a cavity is formed at their center. The two semi-circular cylinders are hinged to the flanges respectively.

[0007] With the above design, the two semi-circular ring cylinders are flipped inward and merged into a whole circular raising cylinder. The separate setting of the raising cylinder into two semi-circular ring cylinders is conducive to the uniform distribution of the weight of the actuator, reducing the problem of excessive space occupied by the flipping of the whole circular raising cylinder, making installation and disassembly easier and more convenient.

[0008] In a possible design, a hanging ear is provided on the top edge of the semi-circular cylinder, a hanging ear is integrally connected to the flange, and a hinge is formed between the hanging ear and the hanging ear via a rotating shaft.

[0009] With the above design, quick assembly and disassembly can be achieved through the cooperation of the hanging ears and the suspension ears, which reduces the number of screws or other fasteners required for traditional fixing methods, simplifies the assembly steps, and improves work efficiency.

[0010] In a possible design, a guide block is protruding from the outer circumference of the semi-circular cylinder, and the guide blocks of the two semi-circular cylinders have contact planes that abut against each other.

[0011] With the above design, the contact plane is used to increase the contact area, ensuring that the two semi-circular ring cylinders can be accurately aligned when merged, avoiding the problem of unstable connection due to inaccurate alignment, improving the concentricity of the semi-circular ring cylinders after merging, and thus improving the alignment accuracy of the overall structure.

[0012] In a possible design, a tapered edge is fixedly provided on the contact plane of one of the guide blocks, and a positioning groove is provided on the contact plane of the other guide block, and the tapered edge is placed in the positioning groove to form a limiting fit.

[0013] With the above design, this limit fit allows each installation to maintain consistent centering accuracy, improves the reliability of the overall structure, prevents misalignment, and simplifies installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of a specific embodiment of the utility model;

[0015] Figure 2 This is a structural diagram of the utility model's raising cylinder;

[0016] Figure 3 This is a schematic diagram of the structure of a single semi-circular ring cylinder of the utility model Figure 1 ;

[0017] Figure 4 This is a schematic diagram of the structure of a single semi-circular ring cylinder of the utility model Figure 2 ;

[0018] Among them, 1. Shell; 2. Flange; 3. Valve stem; 4. Top flange; 5. Spacer cylinder; 51. Cavity; 52. Top connection part; 53. Bottom connection part; 54. Semi-circular ring cylinder; 55. Hanging ear; 21. Suspended ear; 56. Guide block; 561. Contact plane; 562. Conical edge; 563. Positioning groove. DETAILED DESCRIPTION

[0019] like Figure 1-Figure 2 The electric actuator for preventing valve stem from hanging in the air shown in the figure comprises a housing 1 and a flange 2 connectable to a valve, the valve comprising a valve stem 3 and a top flange 4, a movable spacer 5 provided on the flange 2, the top edge of the spacer 5 being hinged to the flange 2 to form a rotational connection, so that the spacer 5 can be flipped over and placed between the flange 2 and the top flange 4, a cavity 51 is formed at the center of the spacer 5 for the valve stem 3 to pass through, the top and bottom ends of the spacer 5 respectively having a top connecting portion 52 and a bottom connecting portion 53, which are respectively fixedly connected to the flange 2 and the top flange 4 after the spacer 5 is flipped over. When there is a certain distance between the flange 2 and the top flange 4, the spacer 5 is rotated from its hanging position around the hinge so that it is flipped over and placed between the flange 2 and the top flange 4, and the top connecting portion 52 and the bottom connecting portion 53 of the spacer 5 are respectively fastened to the flange 2 and the top flange 4 by bolts. Generally, the height of the valve stem 3 extending beyond the top flange 4 is typically between 15 and 30 cm, and the height of the spacer 5 is set between 5 and 20 cm. For example, suppose the valve stem 3 extends 28 cm beyond the top flange 4, and the spacer 5 is set to 15 cm. In this case, if the actuator is directly installed without the spacer 5, a gap of approximately 10 cm may remain between the flange 2 and the top flange 4, resulting in an overhang. If the spacer 5 is 15 cm high, flipping the spacer 5 into place and securing it, the remaining height is 13 cm: the height of the valve stem 3 extending beyond the top flange 4 (28 cm) minus the height of the spacer 5 (15 cm). This means that the valve stem 3 extends 13 cm beyond the spacer 5, and at this height, the valve stem 3 still forms an effective transmission connection with the actuator output. Alternatively, if the overhang is not present, flipping the spacer 5 back into place and directly securing the flange 2 and top flange 4 will allow the valve stem 3 to maintain a normal connection with the actuator.

[0020] like Figure 2-Figure 4As shown, since the space involved in the flipping process of the raising cylinder 5 is too large, in order to reduce the flipping range, the raising cylinder 5 is divided into two parts, which include two semi-circular ring cylinders 54 that can form a full circle. When the two semi-circular ring cylinders 54 are combined, their center positions form a cavity 51. One side of the two semi-circular ring cylinders 54 is rotatably connected to the flange 2. In this way, the space occupied by the two semi-circular ring cylinders 54 when flipped is smaller and more evenly distributed, making installation and removal easier and more convenient.

[0021] The top edge of the semi-circular cylinder 54 features a lug 55. A cantilever lug 21 is integrally connected to the flange 2. The cantilever lug 21 and the lug 55 are hingedly connected via a pivot. This allows the semi-circular cylinder 54 to be freely rotated during installation, facilitating adjustment of its position according to actual conditions and making the installation process more flexible and convenient. This provides greater operating space and convenience, particularly in installation environments with limited space or limited access. For maintenance or inspection, the semi-circular cylinder 54 can be easily opened, allowing internal components to be inspected or adjusted without disassembling the entire actuator.

[0022] A guide block 56 is protruded from the outer circumference of the semi-circular cylinder 54. The guide block 56 extends radially outward, and the guide blocks 56 of the two semi-circular cylinders 54 have contact surfaces 561 that abut against each other. This ensures a tight fit between the two semi-circular cylinders 54 when they are joined, reduces gaps caused by installation errors, helps prevent operational errors caused by poor connection, and improves the safety and reliability of the structure.

[0023] A tapered edge 562 is fixedly mounted on the contact surface 561 of one pilot block 56, while a positioning slot 563 is defined on the contact surface 561 of the other pilot block 56. The tapered edge 562 fits within the positioning slot 563 to form a retaining fit. This retaining fit between the tapered edge 562 and the positioning hole effectively prevents the two semi-circular cylinders 54 from misalignment or loosening due to external factors (such as vibration) during use, enhancing the stability of the connection. This also simplifies and speeds up the installation process. The operator simply inserts the tapered edge 562 into the positioning hole to complete the positioning process, eliminating the need for additional tools or complex adjustment steps, thus improving installation efficiency.

Claims

1. An electric actuator for preventing a valve stem from hanging in the air, comprising a housing (1) and a flange (2) connected to a valve, wherein the valve comprises a valve stem (3) and a top flange (4), and is characterized in that: A movable raising cylinder (5) is provided on the flange (2), and the top edge of the raising cylinder (5) is hinged to the flange (2) so that the raising cylinder (5) can be flipped and placed between the flange (2) and the top flange (4). The center position of the raising cylinder (5) forms a cavity (51) for the valve stem (3) to pass through. The top and bottom ends of the raising cylinder (5) respectively have a top connecting portion (52) and a bottom connecting portion (53). The top connecting portion (52) and the bottom connecting portion (53) are respectively fixedly connected to the flange (2) and the top flange (4) after the raising cylinder (5) is flipped.

2. The electric actuator for preventing valve stem from hanging in the air according to claim 1, characterized in that: The raising cylinder (5) includes two semi-circular cylinders (54) that can form a full circle. When the two semi-circular cylinders (54) are combined, their central positions form the cavity (51). The two semi-circular cylinders (54) are hinged to the flange (2) respectively.

3. The electric actuator for preventing valve stem from hanging in the air according to claim 2, characterized in that: The top edge of the semi-circular cylinder (54) is provided with a hanging ear (55), and the flange (2) is integrally connected with a hanging ear (21), and the hanging ear (21) and the hanging ear (55) are hinged via a rotating shaft.

4. The electric actuator for preventing valve stem from hanging in the air according to claim 2, characterized in that: A guide block (56) is protrudingly provided at the outer circumference of the semi-circular cylinder (54), and the guide blocks (56) of the two semi-circular cylinders (54) have contact planes (561) that abut against each other.

5. The electric actuator for preventing valve stem from hanging in the air according to claim 2, characterized in that: A conical edge (562) is fixedly provided on the contact plane (561) of one of the guide blocks (56), and a positioning groove (563) is provided on the contact plane (561) of the other guide block (56), wherein the conical edge (562) is placed in the positioning groove (563) to form a limiting fit.

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