Partitioned heating device for local heat treatment of shaft products

Abstract

The utility model discloses a shaft product local heat treatment partition heating device, relates to a steam turbine rotor partition heating control device, and aims to solve the problem that the local heat treatment temperature cannot be uniform and consistent after rotor surfacing. The vertical sections of a lower furnace body and an upper furnace body are semicircular, and the lower furnace body and the upper furnace body form a cylindrical structure; the asbestos layer is arranged on the inner side of the cylindrical structure; the multiple sets of heating pieces are each of an annular structure formed by an upper heating piece and a lower heating piece, the multiple sets of heating pieces are evenly fixed to the inner side of the asbestos layer in the shaft diameter length direction of the shaft diameter to be heated, and joints of the multiple sets of heating pieces extend out of the butt joint position of the lower furnace body and the upper furnace body. The shaft diameter to be heated is arranged in the multiple sets of heating pieces, and the multiple sets of heating pieces are connected with different power output channels of the intelligent temperature control cabinet through power lines respectively. A shaft diameter heat treatment temperature curve is arranged on the intelligent temperature control cabinet, and different shaft diameter heat treatment temperature curves are respectively introduced into the multiple groups of heating sheets according to different heating parts. The beneficial effect is that the heat treatment temperature can be uniform and consistent.

Description

Technical Field

[0001] The utility model relates to a steam turbine rotor zone heating device. Background Art

[0002] The combination of all rotating parts in a steam turbine is called a rotor, which includes the main shaft, impeller, moving blades, couplings and other parts mounted on the shaft; the steam turbine rotor is the heart of the steam turbine, and its working conditions are very harsh; the steam turbine rotor rotates at high speed in high-temperature steam, and not only bears the force of the airflow and the stress caused by the centrifugal force of the blades and impeller itself, but also bears the thermal stress caused by the temperature difference.

[0003] During operation, adhesion and sintering are very likely to occur between the shaft diameter and bearing of the rotor main shaft, and between the rotor thrust plate and the bearing shell, which may cause shaft system abnormalities. Therefore, the rotor shaft diameter and thrust plate need to be clad with different materials. However, during the local heat treatment of the rotor cladding position after cladding, the heating temperature cannot be stabilized and consistent due to uneven heat dissipation on both sides of the local heat treatment position, resulting in inconsistent hardness of the shaft diameter and thrust plate position after heat treatment, which endangers the safe operation of the rotor and even the unit. Utility Model Content

[0004] The utility model aims to solve the problem that the temperature of the local heat treatment of the rotor cannot be uniform after surfacing welding, and proposes a zoned heating device for the local heat treatment of shaft products.

[0005] The utility model discloses a zoned heating device for local heat treatment of shaft products, which comprises a lower furnace body, an upper furnace body, an asbestos layer and a plurality of groups of heating plates;

[0006] The vertical cross-sections of the lower furnace body and the upper furnace body are both semicircular, the opening end of the upper furnace body is relatively arranged on the opening end of the lower furnace body, and the lower furnace body and the upper furnace body form a cylindrical structure;

[0007] The asbestos layer is arranged inside the cylindrical structure;

[0008] The multiple groups of heating plates are all annular structures composed of an upper heating plate and a lower heating plate. The multiple groups of heating plates are evenly fixed on the inner side of the asbestos layer along the length direction of the shaft diameter to be heated, and the joints of the multiple groups of heating plates extend from the joints of the lower furnace body and the upper furnace body; the shaft diameter to be heated is arranged in the multiple groups of heating plates, and the joints of the multiple groups of heating plates are respectively connected to different power output channels of the intelligent temperature control cabinet through power cords; a shaft diameter heat treatment temperature curve is set on the intelligent temperature control cabinet, and different shaft diameter heat treatment temperature curves are respectively introduced into the multiple groups of heating plates according to different heating parts.

[0009] Furthermore, the lower furnace body and the upper furnace body are respectively and evenly provided with a plurality of fixing holes;

[0010] The asbestos layer and the plurality of heating plates are fixed on the cylindrical structure formed by the lower furnace body and the upper furnace body through a plurality of fixing holes.

[0011] Furthermore, the length of the cylindrical structure formed by the lower furnace body and the upper furnace body is greater than the length of the diameter of the shaft to be heated.

[0012] Furthermore, the lower furnace body and the upper furnace body form a cylindrical structure which is extended by 200 mm to 300 mm on both sides along the length direction of the shaft diameter to be heated.

[0013] Furthermore, the diameter of the cylindrical structure formed by the lower furnace body and the upper furnace body is larger than the diameter of the shaft to be heated.

[0014] Furthermore, the central axis of the cylindrical structure formed by the lower furnace body and the upper furnace body coincides with the central axis of the shaft diameter to be heated, and the outer surface of the shaft diameter to be heated is 100mm to 200mm away from the inner surface of the multiple groups of heating plates.

[0015] Furthermore, the widths of the multiple groups of heating plates are the same, and the widths of the multiple groups of heating plates are all N;

[0016] The value range of N is: 200mm to 300mm.

[0017] Furthermore, two circles of thermal insulation asbestos are wrapped around the two ends of the shaft to be heated in a circumferentially wound manner; and the width of the thermal insulation asbestos is set to 200mm to 300mm.

[0018] Furthermore, angle iron or round steel is used to fix the lower furnace body at the outer bottom thereof.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The shaft diameter to be heated in the utility model is the surfacing area of ​​the steam turbine rotor. According to the different heating temperatures required for different parts of the surfacing area of ​​the steam turbine rotor, different shaft diameter heat treatment temperature curves are set for multiple groups of heating plates, and the thermal insulation effect of the asbestos layer is utilized to realize the heat treatment of the rotor by furnace partition control. The heat treatment temperature of the rotor surfacing area can be uniform, the hardness of the product is uniform in the subsequent hardness inspection, and the product quality is guaranteed. The utility model can also be applied to the heat treatment of other similar shaft products at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view of a zoned heating device for local heat treatment of shaft products described in the first specific implementation mode;

[0022] Figure 2 It is a side view of a zoned heating device for local heat treatment of shaft products according to the first specific implementation mode;

[0023] Among them, 1 is the diameter of the shaft to be heated; 2 is the lower furnace body; 3 is the upper furnace body; 4 is the asbestos layer; and 5 is a plurality of groups of heating plates. DETAILED DESCRIPTION

[0024] Specific implementation method 1. Combination Figure 1 to Figure 2 The present embodiment is described as a zoned heating device for local heat treatment of shaft products, the heating device comprising a lower furnace body 2, an upper furnace body 3, an asbestos layer 4 and a plurality of groups of heating plates 5;

[0025] The vertical cross-sections of the lower furnace body 2 and the upper furnace body 3 are both semicircular, the opening end of the upper furnace body 3 is relatively arranged on the opening end of the lower furnace body 2, and the lower furnace body 2 and the upper furnace body 3 form a cylindrical structure;

[0026] The asbestos layer 4 is arranged inside the cylindrical structure; the asbestos layer 4 has the function of heat preservation and insulation, preventing the heat generated by the heating plate 5 from being dissipated through the lower furnace body 2 or the upper furnace body 3;

[0027] The multiple groups of heating plates 5 are all annular structures composed of an upper heating plate and a lower heating plate. The multiple groups of heating plates 5 are evenly fixed on the inner side of the asbestos layer 4 along the length direction of the shaft diameter 1 to be heated, and the joints of the multiple groups of heating plates 5 extend from the joints of the lower furnace body 2 and the upper furnace body 3; the shaft diameter 1 to be heated is arranged in the multiple groups of heating plates 5, and the joints of the multiple groups of heating plates 5 are respectively connected to different power output channels of the intelligent temperature control cabinet through power lines; a shaft diameter heat treatment temperature curve is set on the intelligent temperature control cabinet, and according to different heating parts, different shaft diameter heat treatment temperature curves are respectively passed through the multiple groups of heating plates 5.

[0028] In this embodiment, the zoning of the shaft diameter 1 to be heated is achieved by using multiple groups of heating plates 5, each group of heating plates 5 is a zone, and different shaft diameter heat treatment temperature curves are set in the multiple groups of heating plates 5 by using an intelligent temperature control cabinet to achieve zone control of different heat treatment temperatures in different parts, and utilize the thermal insulation effect of the asbestos layer 4 to achieve the purpose of uniform local heat treatment temperature in the turbine rotor surfacing area; the asbestos layer 4 is thermal insulation asbestos.

[0029] In this embodiment, the shaft diameter heat treatment temperature curve refers to a curve in which each group of heating plates 5 generates different temperatures at different times; the temperature generated by each group of heating plates 5 is directly proportional to the current passed through each group of heating plates 5; the different shaft diameter heat treatment temperature curves refer to the different temperatures generated by multiple groups of heating plates 5 at the same time; in this embodiment, at the same time, the temperature generated by the heating plates 5 located at the edge is greater than the temperature generated by the adjacent heating plates, that is, the temperature generated by a group of heating plates or two groups of heating plates located in the middle is the lowest, and the temperature generated by the two groups of heating plates located at the two ends is the highest, thereby ensuring that the heating temperature of all parts of the shaft diameter 1 to be heated is uniform.

[0030] Specific implementation method 2: This implementation method further defines the local heat treatment zone heating device for shaft products described in specific implementation method 1. In this implementation method, a plurality of fixing holes are evenly opened on the lower furnace body 2 and the upper furnace body 3 respectively;

[0031] The asbestos layer 4 and the plurality of heating plates 5 are fixed to the cylindrical structure formed by the lower furnace body 2 and the upper furnace body 3 through a plurality of fixing holes.

[0032] In this embodiment, the asbestos layer 4 and the multiple groups of heating plates 5 are fixed by using the fixing holes opened on the lower furnace body 2 and the upper furnace body 3, so that the asbestos layer 4 is close to the cylindrical structure formed by the lower furnace body 2 and the upper furnace body 3, and the multiple groups of heating plates 5 are close to the asbestos layer 4, thereby enhancing the thermal insulation effect of the asbestos layer 4 and facilitating fixation.

[0033] Specific embodiment three: This embodiment further limits the local heat treatment zone heating device for shaft products described in specific embodiment one or two. In this embodiment, the length of the cylindrical structure formed by the lower furnace body 2 and the upper furnace body 3 is greater than the length of the shaft diameter 1 to be heated.

[0034] In this embodiment, the lower furnace body 2 and the upper furnace body 3 are both made of iron plates; the length of the cylindrical structure is greater than the length of the shaft diameter 1 to be heated in order to ensure that all parts of the shaft diameter 1 to be heated can be heated simultaneously.

[0035] Specific embodiment 4. This embodiment further limits the local heat treatment zone heating device for shaft products described in specific embodiment 3. In this embodiment, the lower furnace body 2 and the upper furnace body 3 form a cylindrical structure that extends 200 mm to 300 mm on both sides along the length direction of the shaft diameter 1 to be heated.

[0036] In this embodiment, the cylindrical structure is extended by 200 mm to 300 mm on both sides along the length direction of the shaft diameter 1 to be heated, which can meet the heating effect and avoid the cylindrical structure being too long and wasting electricity; therefore, this size is most suitable.

[0037] Specific embodiment 5. This embodiment further limits the local heat treatment zone heating device for shaft products described in specific embodiment 1 or 2. In this embodiment, the diameter of the cylindrical structure formed by the lower furnace body 2 and the upper furnace body 3 is larger than the diameter of the shaft diameter 1 to be heated.

[0038] In this embodiment, the diameter of the cylindrical structure is larger than the diameter of the shaft diameter 1 to be heated in order to ensure that the heating shaft diameter 1 can be fully placed in the cylindrical structure.

[0039] Specific embodiment six. This embodiment further limits the zoned heating device for local heat treatment of shaft products described in specific embodiment five. In this embodiment, the central axis of the cylindrical structure formed by the lower furnace body 2 and the upper furnace body 3 coincides with the central axis of the shaft diameter 1 to be heated, and the outer surface of the shaft diameter 1 to be heated is at a distance of 100 mm to 200 mm from the inner surface of the multiple groups of heating plates 5.

[0040] In this embodiment, the shaft diameter 1 to be heated is arranged in a central manner inside the cylindrical structure formed by the lower furnace body 2 and the upper furnace body 3, and the distance between the outer surface of the shaft diameter 1 to be heated and the inner surfaces of the multiple groups of heating plates 5 should not be too large, as too large a distance will lead to a poor heating effect; at the same time, the distance between the outer surface of the shaft diameter 1 to be heated and the inner surfaces of the multiple groups of heating plates 5 should not be too small, as too small a distance will cause the multiple groups of heating plates 5 to adhere to the shaft diameter 1 to be heated, thereby damaging the shaft diameter 1 to be heated.

[0041] Specific embodiment 7. This embodiment further defines the local heat treatment zone heating device for shaft products described in specific embodiment 6. In this embodiment, the widths of the multiple groups of heating plates 5 are the same, and the widths of the multiple groups of heating plates 5 are all N.

[0042] The value range of N is: 200mm to 300mm.

[0043] In this embodiment, the plurality of groups of heating plates 5 are evenly fixed on the inner side of the asbestos layer 4 in a flat manner, and the widths of the plurality of groups of heating plates 5 are mainly arranged to meet the requirements of zoned heating.

[0044] Specific embodiment eight, this embodiment further limits the local heat treatment zone heating device for shaft products described in specific embodiment one. In this embodiment, two circles of thermal insulation asbestos are wrapped circumferentially at both ends of the shaft diameter 1 to be heated; and the setting width of the thermal insulation asbestos is 200mm to 300mm.

[0045] In this embodiment, thermal insulation asbestos is set at both ends of the shaft diameter 1 to be heated, and the thermal insulation asbestos is used to improve the thermal insulation effect of the shaft diameter 1 to be heated and prevent the heat generated by the multiple groups of heating plates 5 from being lost from the two ends of the shaft diameter 1 to be heated.

[0046] Specific embodiment 9. This embodiment further limits the local heat treatment zone heating device for shaft products described in specific embodiment 1. In this embodiment, angle iron or round steel is used to fix the outer bottom of the lower furnace body 2.

[0047] In this embodiment, the lower furnace body 2 is fixed by angle iron or round steel to ensure the stability of the lower furnace body 2 during the heating process and prevent the shaft diameter 1 to be heated from tipping over or falling when rotating during the heat treatment process.

[0048] In this embodiment, the manufacturing and installation method of the local heat treatment zone heating device for shaft products is:

[0049] 1. According to the length and diameter of the shaft diameter 1 to be heated, the length direction of the shaft diameter 1 to be heated is extended by 300 mm on both sides, and the diameter direction is extended by 400 mm on both sides, and the length and circumference of the cylindrical structure formed by the lower furnace body 2 and the upper furnace body 3 are calculated. The iron plate is cut into a rectangular structure according to the above dimensions, and the iron plate of the rectangular structure is rounded in the width direction. After rounding, it is split into two halves along the horizontal plane passing through the central axis of the cylindrical structure. The part below the horizontal plane is the lower furnace body 2, and the part above the horizontal plane is the upper furnace body 3;

[0050] Second, evenly punch fixing holes on the lower furnace body 2 and the upper furnace body 3, respectively, and cover the inner side of the lower furnace body 2 and the upper furnace body 3 with asbestos layers 4, and fix the asbestos layers 4; select multiple groups of heating plates 5, lay and fix the upper heating plates at equal intervals on the inner side of the asbestos layer 4 of the upper furnace body 3; lay and fix the lower heating plates at equal intervals on the inner side of the asbestos layer 4 of the lower furnace body 2, and at the same time, the multiple groups of upper heating plates correspond to the multiple groups of lower heating plates one by one; wherein the diameter of the selected multiple groups of heating plates 5 is smaller than the diameter of the vertical cross-section circle of the cylindrical structure;

[0051] 3. Place the shaft diameter 1 to be heated on the roller, wrap the two ends of the shaft diameter 1 to be heated with insulating asbestos, and then place the lower furnace body 2 with the lower heating plate under the heated shaft diameter 1, leave a heating distance between multiple groups of lower heating plates and the shaft diameter 1 to be heated, and use round steel or angle iron to support and fix the outer side of the lower furnace body 2, and then hoist the upper furnace body 3 with the upper heating plate above the shaft diameter 1 to be heated, so that the open end of the upper furnace body 3 is fitted together with the open end of the lower furnace body 2, and the upper furnace body 3 and the lower furnace body 2 are wrapped with an asbestos layer 4.

[0052] In this embodiment, a heating method based on a zoned heating device for local heat treatment of shaft products is:

[0053] Connect one end of multiple power cords to the intelligent temperature control cabinet, plug the other end of the multiple power cords into the designated heating plate 5 and keep records, test the power cords connected to the intelligent temperature control cabinet, and on the premise of ensuring that the power cord circuit is unobstructed; set the shaft diameter heat treatment temperature curve on the intelligent temperature control cabinet, and set different shaft diameter heat treatment temperature curves for each group of heating plates 5 according to different parts to achieve zoned control of different heat treatment temperatures of different parts.

[0054] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A zoned heating device for local heat treatment of shaft products, characterized in that: The heating device comprises a lower furnace body (2), an upper furnace body (3), an asbestos layer (4) and a plurality of groups of heating plates (5); The vertical cross-sections of the lower furnace body (2) and the upper furnace body (3) are both semicircular, the opening end of the upper furnace body (3) is relatively arranged on the opening end of the lower furnace body (2), and the lower furnace body (2) and the upper furnace body (3) form a cylindrical structure; The asbestos layer (4) is arranged inside the cylindrical structure; The plurality of groups of heating plates (5) are uniformly fixed on the inner side of the asbestos layer (4) along the length direction of the shaft diameter (1) to be heated; the plurality of groups of heating plates (5) are each composed of an upper heating plate and a lower heating plate to form a ring structure, and the joints of the plurality of groups of heating plates (5) extend from the joints of the lower furnace body (2) and the upper furnace body (3); the shaft diameter (1) to be heated is arranged in the plurality of groups of heating plates (5), and the joints of the plurality of groups of heating plates (5) are respectively connected to different power output channels of the intelligent temperature control cabinet through power lines; a shaft diameter heat treatment temperature curve is arranged on the intelligent temperature control cabinet, and different shaft diameter heat treatment temperature curves are respectively introduced into the plurality of groups of heating plates (5) according to different heating positions.

2. A zoned heating device for local heat treatment of shaft products according to claim 1, characterized in that: The lower furnace body (2) and the upper furnace body (3) are respectively and evenly provided with a plurality of fixing holes; The asbestos layer (4) and the plurality of heating plates (5) are fixed to the cylindrical structure formed by the lower furnace body (2) and the upper furnace body (3) through a plurality of fixing holes.

3. A zoned heating device for local heat treatment of shaft products according to claim 1 or 2, characterized in that: The length of the cylindrical structure formed by the lower furnace body (2) and the upper furnace body (3) is greater than the length of the shaft diameter (1) to be heated.

4. A zoned heating device for local heat treatment of shaft products according to claim 3, characterized in that: The lower furnace body (2) and the upper furnace body (3) form a cylindrical structure which is extended by 200 mm to 300 mm on both sides along the length direction of the shaft diameter (1) to be heated.

5. A zoned heating device for local heat treatment of shaft products according to claim 1 or 2, characterized in that: The diameter of the cylindrical structure formed by the lower furnace body (2) and the upper furnace body (3) is greater than the diameter of the shaft diameter (1) to be heated.

6. A zoned heating device for local heat treatment of shaft products according to claim 5, characterized in that: The central axis of the cylindrical structure formed by the lower furnace body (2) and the upper furnace body (3) coincides with the central axis of the shaft diameter (1) to be heated, and the outer surface of the shaft diameter (1) to be heated is at a distance of 100 mm to 200 mm from the inner surface of the plurality of heating plates (5).

7. A zoned heating device for local heat treatment of shaft products according to claim 6, characterized in that: The widths of the multiple groups of heating plates (5) are the same, and the widths of the multiple groups of heating plates (5) are all N; The value range of N is: 200mm to 300mm.

8. The device for local heat treatment of shaft products according to claim 1 is characterized in that: Two circles of thermal insulation asbestos are wrapped around the two ends of the shaft diameter (1) to be heated in a circumferentially wound manner; and the width of the thermal insulation asbestos is set to 200 mm to 300 mm.

9. The device for local heat treatment of shaft products according to claim 1 is characterized in that: Angle iron or round steel is used to fix the outer bottom of the lower furnace body (2).

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