A semicircular heating device for steam valve

Abstract

The present invention relates to a semicircular valve heating device, comprising a lifting component and two semicircular heaters, each of which is a hollow semi-cylindrical structure. Each semicircular heater is provided with a semicircular plate at the end and a flat bracket inside. The two ends of the flat bracket are fixed by the semicircular plate, and the flat bracket is also connected to the inner wall of the semicircular heater by a plurality of support rods. The two semicircular heaters are arranged up and down, and the lifting component is located between the two semicircular heaters and contacts the flat brackets of the two semicircular heaters respectively. Compared with the prior art, the present invention enables the semicircular heater to contact the steam valve tightly, ensuring the heating effect, and the installation process is time-saving and labor-saving, improving efficiency and reducing the safety risk of injury.

Description

Technical Field

[0001] The invention relates to the field of steam valve heat treatment equipment, in particular to a semicircular steam valve heating device. Background Art

[0002] After welding, steam valves require heat treatment with a dedicated heater. For example, during a power plant overhaul, when a steam valve repair is required, the existing cartridge heater must be placed entirely within the valve. Therefore, sufficient clearance must be left when customizing the heater to prevent the cartridge heater from becoming stuck or unable to fit within the valve. However, existing solutions have the following drawbacks:

[0003] 1. What needs to be considered is that due to gravity, the iron sheet outside the tubular heater has better contact with the lower contact surface of the valve, and the gap reserved to facilitate the entry and exit of the tubular heater often makes it difficult for the upper contact surface to conduct heat well.

[0004] 2. Consider that after multiple heat treatments, cartridge heaters will expand due to thermal expansion and contraction, potentially causing deformation of the outer metal covering, creating gaps between the heater and the outer metal covering. Cartridge heaters primarily utilize indirect heat transfer, with the outer metal covering conducting heat to the steam valve. Given the resulting gaps and indirect heat transfer losses, the heat treatment effect cannot be guaranteed.

[0005] 3. What needs to be considered is that the interior of the cylindrical heater is a hollow structure and cannot be filled with enough insulation cotton to reduce heat dissipation. Summary of the Invention

[0006] The purpose of the present invention is to provide a semicircular valve heating device in order to overcome the defect in the prior art that the cylindrical heater and the upper contact surface of the steam valve cannot have good contact and heat conduction.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A semicircular valve heating device comprises a lifting component and two semicircular heaters, each of which is a hollow semi-cylindrical structure, each of which is provided with a semicircular plate at the end and a flat bracket inside, the two ends of the flat bracket being fixed by the semicircular plate, and the flat brackets are further connected to the inner walls of the semicircular heaters through a plurality of support rods;

[0009] The two semicircular heaters are arranged up and down, and the lifting component is located between the two semicircular heaters and contacts the plane supports of the two semicircular heaters respectively.

[0010] Furthermore, the lifting component is a scissor jack.

[0011] Furthermore, the multiple support rods arranged on the planar bracket include a left support rod located at the left end of the planar bracket, a middle support rod located in the middle of the planar bracket, and a right support rod located at the right end of the planar bracket. The angles between the left support rod and the right support rod and the planar bracket are both 120 degrees, and the middle support rod is perpendicular to the planar bracket.

[0012] Furthermore, the lifting component and the two semicircular heaters are both installed in the steam valve, the two semicircular heaters are respectively located at upper and lower positions in the steam valve, and a thermocouple is provided between the semicircular heaters and the steam valve.

[0013] Furthermore, the thermocouple contacts the semicircular heater and the steam valve respectively.

[0014] Furthermore, the steam valve is a high-pressure main steam valve, a high-pressure regulating valve, a medium-pressure main steam valve or a medium-pressure regulating valve of a steam turbine.

[0015] Furthermore, thermal insulation cotton is embedded in the interlayer of the semicircular heater.

[0016] Furthermore, a handle is provided on the semicircular plate.

[0017] Furthermore, the planar bracket is located on one side of the center of the semicircular heater.

[0018] Furthermore, the distance between the two planar supports of the semicircular heaters is within the variable height range of the lifting component.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] (1) This solution divides the original cylindrical heater into two parts, constructing two semicircular heaters, with a flat bracket inside, which is lifted and supported by a scissor jack set between the two semicircular heaters. The upper semicircular heater is stably supported by the flat bracket and support rod, so that the semicircular heater can be in close contact with the steam valve, ensuring the heating effect.

[0021] (2) In this solution, the thermocouples are arranged up and down during the heat treatment process, which makes the measured temperature more accurate and the temperature control effect better. The heat is evenly transferred to the circumference, reducing the influence of thermal stress inside the valve seat.

[0022] (3) The volume of the semicircular valve heating device is half of the original one, and a flat bracket is used inside to reduce the weight, so the weight is half of the original one. This saves time and effort when arranging the semicircular valve heating device, improves efficiency, and reduces the safety risk of injury. Originally, it required three heat treatment workers to cooperate to place the cylindrical heater as a whole into the steam valve. Now, it only takes two heat treatment workers in two times to place the semicircular valve heating device into the steam valve, which reduces a certain amount of labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic front view of the structure of a semicircular valve heating device provided in an embodiment of the present invention;

[0024] Figure 2 This is a schematic left side view of the structure of a semicircular valve heating device provided in an embodiment of the present invention;

[0025] Figure 3 This is a schematic top view of the structure of a semicircular valve heating device provided in an embodiment of the present invention;

[0026] Figure 4 A schematic diagram of the structure and cross-sectional dimensions of a steam valve using a semicircular steam valve heating device provided in an embodiment of the present invention;

[0027] In the figure, 1. semicircular heater, 2. flat bracket, 3. support rod, 4. handle, 5. steam valve. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0031] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0032] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0033] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0034] Example 1

[0035] like Figure 1-3 As shown, this embodiment provides a semicircular valve heating device, including a lifting component and two semicircular heaters 1. Each semicircular heater 1 is a hollow semi-cylindrical structure. Each semicircular heater 1 is provided with a semicircular plate at the end and a flat bracket 2 inside. The two ends of the flat bracket 2 are fixed by the semicircular plate. The flat bracket 2 is also connected to the inner wall of the semicircular heater 1 through a plurality of support rods 3.

[0036] The two semicircular heaters 1 are arranged up and down, and the lifting component is located between the two semicircular heaters 1 and contacts the planar supports 2 of the two semicircular heaters 1 respectively.

[0037] The planar support 2 is located on one side of the center of the semicircular heater 1 , and the distance between the planar supports 2 in the two semicircular heaters 1 is within the variable height range of the lifting component.

[0038] The lifting component is a device with lifting and supporting functions, preferably a scissor jack.

[0039] The improved heater in this solution splits the original cylindrical heater into two, symmetrically designed. First, the iron sheet covering the original heater must be removed to allow the heater to directly contact and exchange heat with the steam valve. Secondly, to allow the heater to better contact the steam valve, the two heater molds can be arranged one above the other, with a supporting force in the middle to ensure good contact between the upper and lower contact surfaces. This solution uses a scissor jack to balance the upper and lower molds. A scissor jack is a type of lifting equipment that can lift and support the upper and lower molds. It is stable, reliable, and not afraid of high temperatures. Placing it between the two molds can achieve a balanced and stable working state.

[0040] In order to provide a fulcrum for its upper and lower support rods 3, a flat bracket 2 (T = 5 mm) must be added to the mold;

[0041] In order to evenly transmit the force on the fulcrum to the plane bracket 2, a support rod 3 (T = 5mm) is added at 60°, 90°, and 120° to ensure the stability and reliability of the mold; specifically, the multiple support rods 3 provided on the plane bracket 2 include a left end support rod located at the left end of the plane bracket 2, a middle support rod located in the middle of the plane bracket 2, and a right end support rod located at the right end of the plane bracket 2, as shown in FIG. Figure 1 As shown, the included angle a between the left support rod and the right support rod and the plane support 2 is 120 degrees, and the middle support rod is perpendicular to the plane support 2.

[0042] The heating plate is fixed by punching holes outside the mold so that the heating plate can contact the steam valve tightly to ensure the heating effect.

[0043] Finally, thermal insulation cotton with a thickness of 50mm is embedded in the interlayer of the heater mold. This can reduce heat loss during the heating and insulation process of the heater, and transfer heat energy to the valve side as much as possible to ensure that the valve heat treatment achieves the desired effect.

[0044] In order to facilitate the movement of the semicircular heater, preferably, a handle 4 is provided on the semicircular plate on one side of the semicircular heater.

[0045] The above-mentioned semicircular steam valve heating device can be used for heat treatment of high-pressure main steam valve, high-pressure regulating valve, medium-pressure main steam valve or medium-pressure regulating valve of steam turbine.

[0046] like Figure 4 As shown, the application process of the above-mentioned semicircular valve heating device is introduced below by taking the turbine medium-pressure main steam valve 5 as an example.

[0047] Weld a flat bracket (2) into the semicircular iron plate according to the design drawings. The steam valve length is 460mm, as shown in the drawings. To accommodate the heater, and considering the 500mm gap between the steam port and the valve opening, the semicircular heater is approximately 1000mm long. Weld two 10mm thick handles (4) between the semicircular iron plate and the flat bracket (2) to facilitate lifting and moving the semicircular heater.

[0048] Based on the drawings, the valve inner diameter is known. The distance from the edge of the semicircular iron plate to the center is equal to the valve inner diameter minus the thickness of the heating ceramic (10mm), the thickness of the semicircular iron plate (2mm), and the insulation thickness (50mm). The calculation formula is: 555-(2×2+50)×2=447. The height from the center of the circle to flat bracket 2 is 80mm. The scissor jack has specifications of 465*95*100mm and a variable height range of 100-440mm. The distance of 160mm between the upper and lower flat brackets 2 is sufficient to accommodate the scissor jack. The following are the specific steps for valve heat treatment:

[0049] 1. Glue the thermocouples at the 6 o'clock and 12 o'clock positions to meet the requirement that the semicircular heater 40KW needs two thermocouples for upper and lower temperature control.

[0050] 2. Arrange the two semicircular steam valve heating devices up and down, place a semicircular heater at the bottom of the steam valve first; then place the other semicircular steam valve heating device on it, and temporarily use the semicircular iron plate as a support to ensure balance.

[0051] 3. Place the scissor jack between the upper and lower flat supports, with the upper and lower fulcrums centered (500mm) above the valve semicircular heater. Rotate the rocker clockwise, raising the jack until the upper and lower thermocouples contact and mate with valve 5 and the semicircular heater. Once the scissor jack is in a stable and balanced state, connect it to the heat treatment line for heat treatment.

[0052] This semi-circular valve heater is half the size of the original design, and its weight is reduced to half by using a flat internal bracket. This reduces the time and effort required by heat treaters when installing the semi-circular valve heater, improving efficiency and reducing the risk of injury. Previously, it took three heat treaters to complete the placement of the cylindrical heater in the steam valve. Now, only two heat treaters can complete the placement in two steps, significantly reducing labor costs.

[0053] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A semicircular valve heating device, characterized in that: It comprises a lifting component and two semicircular heaters (1), each of the semicircular heaters (1) is a hollow semi-cylindrical structure, each of the semicircular heaters (1) is provided with a semicircular plate at the end and a plane bracket (2) inside, the two ends of the plane bracket (2) are fixed by the semicircular plate, and the plane bracket (2) is also connected to the inner wall of the semicircular heater (1) through a plurality of support rods (3); The two semicircular heaters (1) are arranged one above the other, and the lifting component is located between the two semicircular heaters (1) and contacts the planar supports (2) of the two semicircular heaters (1) respectively; A plurality of support rods (3) provided on the planar support (2) include a left support rod located at the left end of the planar support (2), a middle support rod located in the middle of the planar support (2), and a right support rod located at the right end of the planar support (2), wherein the angles between the left support rod and the right support rod and the planar support (2) are both 120 degrees, and the middle support rod is perpendicular to the planar support (2); The lifting component and the two semicircular heaters (1) are both installed in the steam valve (5). The two semicircular heaters (1) are respectively located at upper and lower positions in the steam valve (5). A thermocouple is provided between the semicircular heaters (1) and the steam valve (5).

2. A semicircular valve heating device according to claim 1, characterized in that: The lifting component is a scissor jack.

3. A semicircular valve heating device according to claim 1, characterized in that: The thermocouple contacts the semicircular heater (1) and the steam valve (5) respectively.

4. A semicircular valve heating device according to claim 1, characterized in that: The steam valve (5) is a high-pressure main steam valve, a high-pressure regulating valve, a medium-pressure main steam valve or a medium-pressure regulating valve of a steam turbine.

5. A semicircular valve heating device according to claim 1, characterized in that: Thermal insulation cotton is embedded in the interlayer of the semicircular heater (1).

6. A semicircular valve heating device according to claim 1, characterized in that: A handle (4) is provided on the semicircular plate.

7. A semicircular valve heating device according to claim 1, characterized in that: The planar support (2) is located on one side of the center of the semicircular heater (1).

8. A semicircular valve heating device according to claim 7, characterized in that: The distance between the midplane supports (2) of the two semicircular heaters (1) is within the variable height range of the lifting component.

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