A casting device and method for a steam turbine main steam regulating valve body

Abstract

The present invention discloses a casting device for a main steam regulating valve body of a steam turbine, which is used to cooperate with a ladle and includes: a base; a support shaft, the support shaft being rotatably mounted on the base; a mold, a sand core being provided in the mold; the mold being connected to the support shaft; a pouring port being provided on the mold and cooperating with the water outlet of the ladle; a driving portion, the driving portion having a first state and a second state, wherein when the driving portion is in the first state, the driving portion drives the mold to rotate; when the driving portion is in the second state, the driving portion is separated from the mold. By continuously changing the rotation speed of the mold, the molten metal in the mold is driven to sway, and bubbles in the molten metal are discharged, thereby avoiding the generation of bubbles in the valve body formed by casting and ensuring production quality.

Description

Technical Field

[0001] The present invention relates to the technical field of casting equipment, and in particular to a casting device and method for a main steam regulating valve body of a steam turbine. Background Art

[0002] Steam turbines are the primary equipment in thermal power plants. Steam intake and exhaust are controlled through the coordinated operation of various valves. High-pressure main steam regulating valves regulate the main steam flow. Four high-pressure main steam regulating valves are typically located at the rear end of the main steam valve, symmetrically mounted on either side of the turbine. These valves independently regulate the flow of steam entering the high-pressure cylinders. Each high-pressure main steam regulating valve is equipped with its own oil motor, valve body, valve stem, and valve seat.

[0003] The main steam regulating valve body is a key component of the steam turbine and is generally formed by casting.

[0004] Chinese Patent Application No. CN200710023513.4 discloses a casting method for a steam turbine main steam regulating valve body. This method, which belongs to the field of metal casting, utilizes a flat-cast vertical pouring process, followed by a two-stage heat treatment system. This method overcomes the drawbacks associated with shrinkage feeding, achieves or even exceeds mechanical performance specifications, and successfully achieves mass production of steam turbine main steam regulating valve bodies. This prior art method produces products that may contain air bubbles, which is why this application is filed. Summary of the Invention

[0005] In order to solve at least one of the technical problems existing in the background technology, the present invention provides a casting device and method for a main steam regulating valve body of a steam turbine.

[0006] The present invention provides a casting device for a main steam regulating valve body of a steam turbine, which is used to cooperate with a ladle and comprises:

[0007] base;

[0008] a support shaft, the support shaft being rotatably mounted on the base;

[0009] A mold, wherein a sand core is provided in the mold; the mold is connected to the support shaft; the mold is provided with a pouring port that matches the water outlet of the ladle;

[0010] The driving part has a first state and a second state. When the driving part is in the first state, the driving part drives the mold to rotate; when the driving part is in the second state, the driving part is separated from the mold.

[0011] Preferably, a gear ring is provided on the outer peripheral wall of the mold;

[0012] The driving unit includes:

[0013] cylinder;

[0014] a first support member connected to an output end of the cylinder;

[0015] A first rack is mounted on the first support member and matches the gear ring.

[0016] Preferably, the driving unit further includes:

[0017] a second support member connected to the output end of the cylinder; the second support member and the first support member are arranged on both sides of the ring gear;

[0018] A plurality of second racks are installed on the second support member, the second racks cooperate with the gear ring, and the plurality of second racks and the first rack are arranged at intervals.

[0019] Preferably, the position of the first rack relative to the first support member is adjustable; the position of the second rack relative to the second support member is adjustable.

[0020] Preferably, a liquid inlet pipe is rotatably mounted on the pouring port, the top end of the liquid inlet pipe is in an inverted cone shape, and the top end of the liquid inlet pipe is used to cooperate with the water outlet of the ladle.

[0021] Preferably, the device further comprises an adjusting part, which has state one and state two. When the adjusting part is in state one, the adjusting part closes the liquid inlet pipe; when the adjusting part is in state two, the adjusting part opens the liquid inlet pipe.

[0022] Preferably, the side wall of the liquid inlet pipe is provided with a plurality of through holes evenly distributed at intervals;

[0023] The adjustment portion includes a plurality of adjustment units, and the plurality of adjustment units correspond one-to-one to the plurality of through holes, wherein the adjustment units include:

[0024] a moving member capable of moving relative to the liquid inlet pipe;

[0025] a sealing block, the sealing block being located in the liquid inlet pipe and connected to the moving member, wherein when a plurality of the sealing blocks abut against each other, the plurality of sealing blocks seal the liquid inlet pipe;

[0026] A limiting column, the limiting column is vertically installed on the moving part;

[0027] The device further comprises:

[0028] a cylinder, the cylinder being placed outside the liquid inlet pipe and being threadedly connected to the liquid inlet pipe; an annular limiting plate being provided on the inner circumferential wall of the cylinder, the limiting plate being provided with a plurality of limiting grooves, wherein the limiting posts are located in the limiting grooves;

[0029] A spring is sleeved on the cylinder, with one end of the spring abutting against the cylinder and the other end abutting against the liquid inlet pipe.

[0030] Preferably, an annular sealing ring is provided at the bottom end of the ladle, and the sealing ring is located outside the water outlet, and the sealing ring is used to abut against the top end of the cylinder.

[0031] Preferably, a receiving groove for receiving the sealing ring is provided at the top end of the cylinder.

[0032] A method for casting a main steam regulating valve body of a steam turbine, the method comprising the following steps:

[0033] S1. Connect the water outlet of the ladle to the pouring port to allow the molten metal in the ladle to enter the mold;

[0034] S2. When the molten metal enters the mold, the driving unit is used to drive the mold to rotate or separate from the mold.

[0035] The beneficial effects brought by the present invention are:

[0036] The water outlet of the ladle is connected to the pouring port to allow the molten metal in the ladle to enter the mold; during the process of the molten metal entering the mold, the driving part is used to drive the mold to rotate or separate from the mold.

[0037] When the driving part drives the mold to rotate, the mold has a certain rotation speed. When the driving part is separated from the mold, the rotation speed of the mold decreases.

[0038] In this way, by constantly changing the rotation speed of the mold, the molten metal in the mold is driven to shake, and the bubbles in the molten metal are discharged, thus avoiding the formation of bubbles in the valve body formed by casting and ensuring production quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic structural diagram of one aspect of the present invention;

[0040] Figure 2 A schematic diagram of another perspective disclosed in the present invention;

[0041] Figure 3 A cross-sectional view of the present invention;

[0042] Figure 4 A cross-sectional view of a portion of the area disclosed in the present invention;

[0043] Figure 5A schematic diagram of the liquid inlet pipe, etc. disclosed in the present invention;

[0044] Figure 6 It is a cross-sectional view of the liquid inlet pipe and the like disclosed in the present invention. DETAILED DESCRIPTION

[0045] It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of this application can be combined with each other; the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left" and "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the positions or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limitations of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, unless otherwise expressly specified and limited, the term "connection" should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or a transmission connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two elements or the interaction relationship between two elements.

[0047] Reference Figure 1-6 The present invention proposes a casting device for a main steam regulating valve body of a steam turbine, which is used to cooperate with a ladle A and includes: a base 1, a support shaft 2, a mold 3, and a driving part.

[0048] The support shaft 2 is rotatably mounted on the base 1; a sand core is provided in the mold 3; the mold 3 is connected to the support shaft 2; a pouring port 301 is provided on the mold 3, which cooperates with the water outlet A01 of the ladle A; the driving part has a first state and a second state. When the driving part is in the first state, the driving part drives the mold 3 to rotate; when the driving part is in the second state, the driving part is separated from the mold 3.

[0049] The water outlet A01 of the ladle A is connected to the pouring port 301 to allow the molten metal in the ladle A to enter the mold 3; during the process of the molten metal entering the mold 3, the driving unit is used to drive the mold 3 to rotate or separate from the mold 3.

[0050] When the driving part drives the mold 3 to rotate, the mold 3 has a certain rotation speed. When the driving part is separated from the mold 3, the rotation speed of the mold 3 decreases.

[0051] In this way, by continuously changing the rotation speed of the mold 3, the molten metal in the mold 3 is driven to shake, and the bubbles in the molten metal are discharged, thereby avoiding the generation of bubbles in the valve body formed by casting and ensuring production quality.

[0052] As a further improvement of the above embodiment, in one embodiment, a gear ring 4 is provided on the outer peripheral wall of the mold 3;

[0053] The driving part includes: a cylinder 5 , a first support member 6 , and a first rack 7 .

[0054] The first support member 6 is connected to the output end of the cylinder 5 ; the first rack 7 is installed on the first support member 6 , and the first rack 7 cooperates with the gear ring 4 .

[0055] The cylinder 5 drives the first support member 6 to move back and forth continuously. When the first rack 7 engages the ring gear 4, the mold 3 rotates. When the ring gear 4 separates from the first rack 7, the speed of the ring gear 4 and the mold 3 decreases. By continuously changing the speed of the mold 3, bubbles in the mold 3 are easily discharged, ensuring casting quality.

[0056] By allowing the first rack 7 to move back and forth, the rotation direction of the mold 3 is continuously changed, so that bubbles in the mold 3 are easily discharged and the casting quality is guaranteed.

[0057] As a further improvement of the above embodiment, in one implementation, the driving portion further includes: a second support member 8 and a plurality of second racks 9 .

[0058] The second support member 8 is connected to the output end of the cylinder 5; the second support member 8 and the first support member 6 are arranged on both sides of the ring gear 4; multiple second racks 9 are installed on the second support member 8, the second racks 9 are matched with the ring gear 4, and multiple second racks 9 and first racks 7 are arranged at intervals.

[0059] The cylinder 5 drives the second support 8 and the second rack 9 to move. When the second rack 9 is engaged with the ring gear 4, it drives the ring gear 4 and the mold 3 to rotate. At any time, at most one of the first rack 7 and the second rack 9 is engaged with the ring gear 4.

[0060] The first rack 7 and the second rack 9 drive the gear ring 4 and the mold 3 to rotate in different directions, driving the molten metal in the mold 3 to shake, facilitating the discharge of bubbles and ensuring the casting quality.

[0061] As a further improvement to the above embodiment, in one implementation, the position of the first rack 7 relative to the first support member 6 is adjustable; the position of the second rack 9 relative to the second support member 8 is adjustable. By adjusting the positions of the first rack 7 and the second rack 9, the rotation speed of the mold 3 is adjusted, and the sloshing speed and frequency of the molten metal in the mold 3 are adjusted, thereby adapting to the production of valve bodies of different sizes.

[0062] As a further improvement to the above embodiment, in one embodiment, a liquid inlet pipe 10 is rotatably mounted on the pouring nozzle 301. The top end of the liquid inlet pipe 10 is in an inverted cone shape and is configured to engage with the water outlet A01 of the ladle A. The molten metal in the ladle A passes through the top end of the liquid inlet pipe 10 and enters the liquid inlet pipe 10, the pouring nozzle 301, and the mold 3.

[0063] The top end of the liquid inlet pipe 10 is in an inverted cone shape, which facilitates the entry of molten metal.

[0064] As a further improvement of the above embodiment, in one embodiment, the device also includes an adjustment part, which has state one and state two. When the adjustment part is in state one, the adjustment part closes the liquid inlet pipe 10, thereby preventing debris from entering and ensuring product production quality; when the adjustment part is in state two, the adjustment part opens the liquid inlet pipe 10 and opens it when in use.

[0065] As a further improvement of the above embodiment, in one implementation, a plurality of through holes 1001 evenly spaced apart are provided on the side wall of the liquid inlet pipe 10 .

[0066] The adjustment portion includes a plurality of adjustment units, and the plurality of adjustment units correspond one-to-one to the plurality of through holes 1001 , wherein the adjustment units include: a moving part 11 , a sealing block 12 , and a limiting column 13 .

[0067] The movable part 11 can move relative to the liquid inlet pipe 10; the sealing block 12 is located in the liquid inlet pipe 10, and the sealing block 12 is connected to the movable part 11, wherein, when multiple sealing blocks 12 abut against each other, multiple sealing blocks 12 seal the liquid inlet pipe 10; the limiting column 13 is vertically installed on the movable part 11.

[0068] The device further comprises: a cylinder 14, a spring 15,

[0069] The cylinder 14 is placed on the outside of the liquid inlet pipe 10 and is threadedly connected to the liquid inlet pipe 10. An annular limiting plate 19 is provided on the inner wall of the cylinder 14. The limiting plate 19 is provided with a plurality of limiting grooves 191, wherein the limiting column 13 is located in the limiting groove 191.

[0070] The spring 15 is sleeved on the cylinder 14 , with one end of the spring 15 abutting against the cylinder 14 and the other end of the spring 15 abutting against the liquid inlet pipe 10 .

[0071] The spring 15 is in a compressed state. When not in use, the spring 15 pushes the cylinder 14 upward, and at the same time, the cylinder 14 rotates relative to the liquid inlet pipe 10. This in turn drives the limit plate 19 to rotate, which drives the limit column 13 to move inward through the limit groove 191, and then drives the moving member 11 and the sealing block 12 to move inward, so that multiple sealing blocks 12 abut against each other, sealing the liquid inlet pipe 10 and preventing foreign matter from entering.

[0072] During casting, ladle A descends, and the bottom end of ladle A abuts against cylinder 14 to avoid squeezing cylinder 14. Cylinder 14 descends and rotates in the opposite direction, driving limit column 13, moving part 11, and sealing block 12 to move outward, opening liquid inlet pipe 10 to facilitate entry of molten metal.

[0073] After the casting is completed, the ladle A rises and separates from the cylinder 14 , and the cylinder 14 rises again driven by the spring 15 , and then the liquid inlet pipe 10 is sealed by the sealing block 12 .

[0074] In this embodiment, when not in use, the liquid inlet pipe 10 is sealed using an adjustment member, etc. When in use, the inlet pipe 10 cooperates with the ladle A to open the liquid inlet pipe 10 under the pressure of the ladle A, facilitating the entry of molten metal. This ingenious structural design utilizes multiple components that work together to seal or open the liquid inlet pipe 10.

[0075] As a further improvement to the above embodiment, in one embodiment, an annular sealing ring 16 is provided at the bottom end of the ladle A. The sealing ring 16 is located outside the water outlet A01 and is configured to abut against the top end of the cylinder 14. As a further improvement to the above embodiment, in one embodiment, a receiving groove 17 for receiving the sealing ring 16 is provided at the top end of the cylinder 14.

[0076] When the ladle A descends, the sealing ring 16 is placed in the receiving groove 17 to seal the ladle, thereby preventing outside air from entering and affecting the casting quality.

[0077] As a further improvement to the above embodiment, in one embodiment, a positioning hole 1002 is provided on the liquid inlet pipe 10, and a positioning post 18 is provided on the ladle A to cooperate with the positioning hole 1002. The positioning post 18 is inserted into the positioning hole 1002 to facilitate positioning, and the liquid inlet pipe 10 does not need to rotate with the mold 3.

[0078] In another embodiment, a method for casting a main steam regulating valve body of a steam turbine is also disclosed, the method comprising the following steps:

[0079] S1. Connect the water outlet of the ladle to the pouring port to allow the molten metal in the ladle to enter the mold;

[0080] S2. When the molten metal enters the mold, the driving unit is used to drive the mold to rotate or separate from the mold.

[0081] The product obtained in this embodiment has no bubbles.

[0082] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A casting device for a main steam regulating valve body of a steam turbine, used in conjunction with a ladle, characterized in that: include: base; a support shaft, the support shaft being rotatably mounted on the base; A mold, wherein a sand core is provided in the mold; The mold is connected to the support shaft; the mold is provided with a pouring port that matches the water outlet of the ladle; a driving portion, wherein the driving portion has a first state and a second state. When the driving portion is in the first state, the driving portion drives the mold to rotate; when the driving portion is in the second state, the driving portion is separated from the mold; A liquid inlet pipe is rotatably mounted on the pouring port, the top of which is in an inverted cone shape and is adapted to cooperate with the water outlet of the ladle; The device further includes an adjustment portion, the adjustment portion having a first state and a second state. When the adjustment portion is in the first state, the adjustment portion closes the liquid inlet pipe; when the adjustment portion is in the second state, the adjustment portion opens the liquid inlet pipe. The side wall of the liquid inlet pipe is provided with a plurality of through holes evenly distributed at intervals; The adjustment portion includes a plurality of adjustment units, and the plurality of adjustment units correspond one-to-one to the plurality of through holes, wherein the adjustment units include: a moving member capable of moving relative to the liquid inlet pipe; a sealing block, the sealing block being located in the liquid inlet pipe and connected to the moving member, wherein when a plurality of the sealing blocks abut against each other, the plurality of sealing blocks seal the liquid inlet pipe; A limiting column, the limiting column is vertically installed on the moving part; The device further comprises: a cylinder, the cylinder being placed outside the liquid inlet pipe and being threadedly connected to the liquid inlet pipe; an annular limiting plate being provided on the inner circumferential wall of the cylinder, the limiting plate being provided with a plurality of limiting grooves, wherein the limiting posts are located in the limiting grooves; A spring is sleeved on the cylinder, with one end of the spring abutting against the cylinder and the other end abutting against the liquid inlet pipe.

2. The casting device for the main steam regulating valve body of a steam turbine according to claim 1, characterized in that: A gear ring is provided on the outer peripheral wall of the mold; The driving unit includes: cylinder; a first support member connected to an output end of the cylinder; A first rack is mounted on the first support member and matches the gear ring.

3. The casting device for the main steam regulating valve body of a steam turbine according to claim 2, characterized in that: The driving unit further includes: a second support member connected to the output end of the cylinder; the second support member and the first support member are arranged on both sides of the ring gear; A plurality of second racks are installed on the second support member, the second racks cooperate with the gear ring, and the plurality of second racks and the first rack are arranged at intervals.

4. The casting device for a main steam regulating valve body of a steam turbine according to claim 3, characterized in that: The position of the first rack relative to the first support member is adjustable; the position of the second rack relative to the second support member is adjustable.

5. The casting device for a main steam regulating valve body of a steam turbine according to claim 1, characterized in that: An annular sealing ring is provided at the bottom end of the ladle. The sealing ring is located outside the water outlet and is used to abut against the top end of the cylinder.

6. The casting device for the main steam regulating valve body of a steam turbine according to claim 5, characterized in that: The top end of the cylinder is provided with a receiving groove for receiving the sealing ring.

7. A method for casting a main steam regulating valve body of a steam turbine, used for casting a casting device for a main steam regulating valve body of a steam turbine as claimed in claim 1, characterized in that: The method comprises the following steps: S1. Connect the water outlet of the ladle with the pouring port to allow the molten metal in the ladle to enter the mold; S2. During the process of the molten metal entering the mold, use the driving unit to drive the mold to rotate or separate from the mold.

Images