A triple eccentric butterfly valve and its manufacturing method

Abstract

The present invention provides a triple eccentric butterfly valve and a manufacturing method thereof, which adopts a valve seat and a valve body split design, that is, the main valve body, the auxiliary valve body and the valve seat constituting the valve body are three independent parts, which can be processed separately, and the valve seat is arranged between the main valve body and the auxiliary valve body, and the main valve body, the auxiliary valve body and the valve seat are combined into a complete valve body by welding. The technical solution of the present invention reduces the manufacturing difficulty and manufacturing cost of the triple eccentric butterfly valve.

Description

Technical Field

[0001] The invention belongs to the technical field of butterfly valves, and in particular relates to a welded face-sealed three-eccentric butterfly valve and a manufacturing method thereof. Background Art

[0002] As a component used to realize the on-off and flow control of pipeline systems, butterfly valves have been widely used in many fields such as petroleum, chemical industry, metallurgy, hydropower, etc. Because butterfly valves have the advantages of compact structure, flexible operation, reliable sealing and adjustable flow, they are favored by the majority of users. When choosing large-caliber valves, people prefer butterfly valves. Among them, metal hard-sealed butterfly valves have been widely used under high temperature, high pressure, wear and corrosion conditions, and their market demand is increasing year by year.

[0003] At present, the valve body of large-diameter metal hard-sealed butterfly valves is usually made from cast or forged blanks. During the blank manufacturing process, high mold costs, complex manufacturing processes and long manufacturing cycles all lead to high manufacturing costs for the blanks.

[0004] In addition, currently large-diameter metal hard-sealed butterfly valves usually adopt an integrated valve body and valve seat design, which has two obvious disadvantages: first, since the valve seat sealing surface needs to be internally processed, the manufacturing difficulty is high, resulting in high manufacturing costs; second, for the integrated valve body and valve seat design, it is necessary to spray the corresponding material layer on the valve seat surface to make the valve seat surface and the valve body The material is different, resulting in a more complicated manufacturing process and a higher manufacturing cost.

[0005] To sum up, the main problem with large-diameter metal hard-sealed butterfly valves is that the manufacturing cost is high and it is difficult to popularize and promote them on a large scale. Summary of the invention

[0006] In view of this, the present invention provides a triple-eccentric butterfly valve and a manufacturing method thereof, which can reduce the manufacturing difficulty and manufacturing cost of the triple-eccentric butterfly valve.

[0007] Based on the above purpose, the present invention provides a triple eccentric butterfly valve, comprising: a main valve body, an auxiliary valve body, a valve stem, a butterfly plate, a sealing ring and a valve seat; wherein:

[0008] The main valve body, the auxiliary valve body and the valve seat are independently manufactured components;

[0009] The main valve body and the auxiliary valve body constitute the valve body of the butterfly valve, the valve seat is arranged between the main valve body and the auxiliary valve body, and the main valve body and the auxiliary valve body are fixedly connected by welding;

[0010] The valve body includes a valve channel, the butterfly plate is arranged in the valve channel, a sealing ring is arranged on the outer peripheral surface of the butterfly plate, a sealing surface is formed between the sealing ring and the valve seat when the butterfly valve is closed, and the sealing form of the sealing surface is a surface seal.

[0011] Preferably, the main valve body is provided with a first boss, a first inner peripheral surface connected to the first boss, and a first side surface connected to the first inner peripheral surface;

[0012] The valve seat is arranged on the first boss.

[0013] Preferably, the auxiliary valve body is arranged on the valve seat;

[0014] The auxiliary valve body is in a roll shape, and has a first outer peripheral surface, and the first outer peripheral surface is in contact with the first inner peripheral surface;

[0015] When the main valve body and the auxiliary valve body are welded, a weld is formed on the first side surface and the first outer peripheral surface.

[0016] Preferably, the auxiliary valve body is arranged on the valve seat;

[0017] The auxiliary valve body has a first outer peripheral surface, and a second boss formed on the first outer peripheral surface, the second boss includes a second side surface connected to the first outer peripheral surface, and a second outer peripheral surface connected to the second side surface, the first outer peripheral surface contacts the first inner peripheral surface, and the second side surface contacts the first side surface;

[0018] When the main valve body and the auxiliary valve body are welded, a weld is formed on the first side surface and the second outer peripheral surface.

[0019] Preferably, a positioning pin is provided at a position where the main valve body contacts the valve seat, and a positioning hole is provided at a position of the valve seat corresponding to the positioning pin.

[0020] Preferably, a sealing strip is provided at the position where the auxiliary valve body contacts the valve seat.

[0021] Preferably, a groove is formed at a position where the auxiliary valve body contacts the valve seat, and the sealing strip is arranged in the groove.

[0022] Preferably, the main valve body and / or the auxiliary valve body are formed by rolling steel plates.

[0023] Preferably, the material of the main valve body and the auxiliary valve body is different from the material of the valve seat.

[0024] Preferably, the top and bottom ends of the valve body are provided with axial holes, the valve stem is arranged in the axial holes, and the valve stem is connected to the butterfly plate to drive the butterfly plate to rotate.

[0025] Preferably, a notch is formed on the outer circumferential surface of the butterfly plate, the sealing ring is arranged in the notch, and the outer circumferential surface of the sealing ring protrudes from the outer circumferential surface of the butterfly plate.

[0026] Preferably, the outer circumferential surface of the sealing ring and the inner circumferential surface of the valve seat are parts of a conical surface in space.

[0027] The embodiment of the present invention also provides a method for manufacturing a triple-eccentric butterfly valve, comprising:

[0028] The main valve body, auxiliary valve body and valve seat are manufactured respectively;

[0029] The valve seat is arranged inside the main valve body, and the auxiliary valve body is arranged on the valve seat;

[0030] The main valve body and the auxiliary valve body are fixedly connected by welding.

[0031] Preferably, the process of manufacturing the main valve body includes: rolling a steel plate to form the main valve body;

[0032] The process of manufacturing the auxiliary valve body includes: rolling a steel plate to form the auxiliary valve body.

[0033] The beneficial effects of the above technical solution of the present invention are as follows:

[0034] The three-eccentric butterfly valve and its manufacturing method provided in the embodiment of the present invention adopts a split design of valve seat and valve body, that is, the main valve body and auxiliary valve body constituting the valve body are three independent parts with the valve seat, which can be processed separately, and the valve seat is arranged between the main valve body and the auxiliary valve body, and the main valve body, the auxiliary valve body and the valve seat are combined into a complete valve body by welding. Compared with the integrated design of valve body and valve seat, and the prior art processed by casting or forging blanks, the technical solution of the present invention can reduce the manufacturing difficulty and manufacturing cost of the three-eccentric butterfly valve; at the same time, the split design of valve body and valve seat can also realize the use of different materials for the valve body and valve seat, thereby further reducing the manufacturing cost under the premise of ensuring that the main performance of the product remains unchanged, so that the three-eccentric butterfly valve provided by the present invention is suitable for large-scale popularization and promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0036] Figure 1 A schematic diagram of the main structure of a triple eccentric butterfly valve provided in an embodiment of the present invention;

[0037] Figure 2 for Figure 1 Schematic diagram of the main body along the AA section;

[0038] Figure 3 for Figure 1 Schematic diagram of the main body along the BB section Figure 1 ;

[0039] Figure 4 for Figure 3 The schematic diagram is a partial enlarged schematic diagram at position Y;

[0040] Figure 5 for Figure 1 Schematic diagram of the main body along the BB section Figure 2 ;

[0041] Figure 6 for Figure 5 The schematic diagram is a partial enlarged schematic diagram at position Y;

[0042] Figure 7 A schematic flow chart of a method for manufacturing a triple-eccentric butterfly valve provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in detail with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] like Figure 1-6 As shown, the triple-eccentric butterfly valve provided in the embodiment of the present invention may specifically include: a main valve body 1, an auxiliary valve body 2, a valve seat 3, a butterfly plate 4, a sealing ring 5 and a valve stem 6.

[0045] Wherein: the main valve body 1, the auxiliary valve body 2 and the valve seat 3 are independently manufactured components.

[0046] The main valve body 1 and the auxiliary valve body 2 constitute the valve body of the butterfly valve, the valve seat 3 is arranged between the main valve body 1 and the auxiliary valve body 2, and the fixed connection between the main valve body 1 and the auxiliary valve body 2 is achieved by welding.

[0047] The valve body includes a valve channel, a butterfly plate 4 is arranged in the valve channel, a sealing ring 5 is arranged on the outer peripheral surface of the butterfly plate 4, and a sealing surface is formed between the sealing ring 5 and the valve seat 3 when the butterfly valve is closed. The sealing form of the sealing surface is a face seal.

[0048] In the embodiment of the present invention, the main valve body 1 may specifically be provided with a first boss 11 , a first inner peripheral surface 12 connected to the first boss 11 , and a first side surface 13 connected to the first inner peripheral surface 12 .

[0049] In the embodiment of the present invention, the valve seat 3 may be specifically disposed on the first boss 11 .

[0050] In a specific embodiment, a positioning pin 14 is provided at the position where the main valve body 1 contacts the valve seat 3. Correspondingly, a positioning hole 31 is provided at the position of the valve seat 3 corresponding to the positioning pin 14. In this way, the main valve body 1 and the valve seat 3 can be stably connected through the cooperation of the positioning pin 14 and the positioning hole 31. Specifically, the circumferential position of the valve seat 3 can be determined by the positioning pin 14, and the axial position of the valve seat 3 can be determined by welding between the main valve body 1 and the auxiliary valve body 2, thereby avoiding displacement of the valve seat 3 during use and ensuring the stability and reliability of the three-eccentric butterfly valve. At the same time, the correct position of the valve seat 3 relative to the overall valve body can also be ensured.

[0051] In the embodiment of the present invention, the auxiliary valve body 2 may be specifically disposed on the valve seat 3 .

[0052] In a specific embodiment, the auxiliary valve body 2 is in the shape of a roll. Figure 3 As shown, the auxiliary valve body 2 has a first outer peripheral surface 21 , and the first outer peripheral surface 21 can specifically contact the first inner peripheral surface 12 of the main valve body 1 .

[0053] So, if Figure 3 , 4 As shown, when the main valve body 1 and the auxiliary valve body 2 are welded, the weld 7 is formed on the first side surface 13 and the first outer peripheral surface 21 .

[0054] In another specific embodiment, Figure 5 As shown, the auxiliary valve body 2 has a first outer peripheral surface 21, and a second boss 22 formed on the first outer peripheral surface 21, the second boss 22 includes a second side surface 23 connected to the first outer peripheral surface 21, and a second outer peripheral surface 24 connected to the second side surface 23, the first outer peripheral surface 21 contacts the first inner peripheral surface 12 of the main valve body 1, and the second side surface 23 contacts the first side surface 13 of the main valve body 1.

[0055] So, if Figure 5 , 6 As shown, when the main valve body 1 and the auxiliary valve body 2 are welded, the weld 7 is formed on the first side surface 13 and the second outer peripheral surface 24 .

[0056] In a specific embodiment, a sealing strip 25 is provided at the position where the auxiliary valve body 2 contacts the valve seat 3 , so as to ensure the sealing between the auxiliary valve body 2 and the valve seat 3 .

[0057] Optionally, a groove may be formed at the position where the auxiliary valve body 2 contacts the valve seat 3, and the sealing strip 25 may be specifically arranged in the groove and may protrude from the groove by a preset height to ensure the sealing between the auxiliary valve body 2 and the valve seat 3 and the entire three-eccentric butterfly valve.

[0058] In a specific embodiment, a notch 41 is formed on the outer circumference of the butterfly plate 4, and the sealing ring 5 is arranged in the notch 41. The outer circumference of the sealing ring 5 can protrude from the outer circumference of the butterfly plate 4, and the structure of the outer circumference of the sealing ring 5 is arranged to correspond to the inner circumference of the valve seat 3, thereby achieving "surface sealing" between the sealing ring 5 and the valve seat 3. In a specific embodiment, the outer circumference of the sealing ring 5 and the inner circumference of the valve seat 3 can be a part of a conical surface in space.

[0059] The top and bottom ends of the valve body composed of the main valve body 1 and the auxiliary valve body 2 are respectively provided with axial holes (81, 82), so that the valve stem 6 can be set in the axial holes (81, 82) and fixedly connected with the butterfly plate 4 through a fixing device, so as to drive the butterfly plate 4 to rotate and realize the change of the opening and closing state of the three-eccentric butterfly valve.

[0060] In the embodiment of the present invention, the main valve body 1 and the auxiliary valve body 2 which are independently and separately manufactured can be specifically formed by rolling the steel plates used to manufacture the pressure vessel, thereby reducing the manufacturing cost and process difficulty of the triple eccentric butterfly valve.

[0061] Since the main valve body 1, the auxiliary valve body 2 and the valve seat 3 involved in the embodiment of the present invention are independently manufactured components, the material of the main valve body 1 and the auxiliary valve body 2 can be different from the material of the valve seat 3. The valve seat 3 can be made of a material with higher hardness, which not only reduces the manufacturing cost but also ensures the reliability of the operation of the three-eccentric butterfly valve.

[0062] The triple eccentric butterfly valve provided in the embodiment of the present invention has the same or similar “triple eccentric” structural features as those of the existing triple eccentric butterfly valve, which will not be described in detail here.

[0063] The embodiment of the present invention also provides a method for manufacturing a triple eccentric butterfly valve, such as Figure 7 As shown, the method may specifically include:

[0064] Step 71, respectively manufacturing the main valve body 1, the auxiliary valve body 2 and the valve seat 3;

[0065] Step 72, disposing the valve seat 3 inside the main valve body 1, and disposing the auxiliary valve body 2 on the valve seat 3;

[0066] Step 73, the main valve body 1 and the auxiliary valve body 2 are fixedly connected by welding.

[0067] In a specific embodiment, the method for manufacturing a triple-eccentric butterfly valve may include, during the process of manufacturing the main valve body 1 and the auxiliary valve body 2 respectively: rolling a steel plate to form the main valve body; and rolling a steel plate to form the auxiliary valve body.

[0068] The three-eccentric butterfly valve provided in the embodiment of the present invention adopts a split-type design of valve seat and valve body, that is, the main valve body and the auxiliary valve body constituting the valve body are three independent parts from the valve seat and can be processed separately. The valve seat is arranged between the main valve body and the auxiliary valve body, and the main valve body, the auxiliary valve body and the valve seat are welded together to form a complete valve body. Compared with the integrated design of the valve body and valve seat, and the existing technology processed by casting or forging blanks, the manufacturing difficulty and manufacturing cost of the three-eccentric butterfly valve are significantly reduced; at the same time, the split-type design of the valve body and valve seat can also realize the use of different materials for the valve body and valve seat, thereby further reducing the manufacturing cost while ensuring that the main performance of the product remains unchanged, so that the three-eccentric butterfly valve provided by the present invention is suitable for large-scale popularization and promotion.

[0069] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A triple eccentric butterfly valve, characterized in that: include: Main valve body, auxiliary valve body, valve stem, butterfly plate, sealing ring and valve seat; among which: The main valve body, the auxiliary valve body and the valve seat are independently manufactured components; The main valve body and the auxiliary valve body constitute the valve body of the butterfly valve, the valve seat is arranged between the main valve body and the auxiliary valve body, and the main valve body and the auxiliary valve body are fixedly connected by welding; The valve body includes a valve channel, the butterfly plate is arranged in the valve channel, a sealing ring is arranged on the outer peripheral surface of the butterfly plate, a sealing surface is formed between the sealing ring and the valve seat when the butterfly valve is closed, and the sealing form of the sealing surface is a surface seal; The main valve body is provided with a first boss, a first inner peripheral surface connected to the first boss, and a first side surface connected to the first inner peripheral surface; The valve seat is arranged on the first boss; The auxiliary valve body is arranged on the valve seat; The auxiliary valve body is in a roll shape, and has a first outer peripheral surface, the first outer peripheral surface is in contact with the first inner peripheral surface, and when the main valve body and the auxiliary valve body are welded, a weld is formed on the first side surface and the first outer peripheral surface; or, The auxiliary valve body has a first outer peripheral surface, and a second boss formed on the first outer peripheral surface, the second boss includes a second side surface connected to the first outer peripheral surface, and a second outer peripheral surface connected to the second side surface, the first outer peripheral surface contacts the first inner peripheral surface, and the second side surface contacts the first side surface; When welding the main valve body and the auxiliary valve body, a weld is formed on the first side surface and the second outer peripheral surface; A positioning pin is provided at a position where the main valve body contacts the valve seat, and a positioning hole is provided at a position of the valve seat corresponding to the positioning pin.

2. The triple eccentric butterfly valve according to claim 1, characterized in that: A sealing strip is provided at a position where the auxiliary valve body contacts the valve seat.

3. The triple eccentric butterfly valve according to claim 2, characterized in that: A groove is formed at a position where the auxiliary valve body contacts the valve seat, and the sealing strip is arranged in the groove.

4. The triple eccentric butterfly valve according to claim 1, characterized in that: The main valve body and / or the auxiliary valve body are formed by rolling steel plates.

5. The triple eccentric butterfly valve according to claim 1, characterized in that: The material of the main valve body and the auxiliary valve body is different from the material of the valve seat.

6. The triple eccentric butterfly valve according to claim 1, characterized in that: The top and bottom ends of the valve body are provided with shaft holes, the valve stem is arranged in the shaft holes, and the valve stem is connected to the butterfly plate to drive the butterfly plate to rotate.

7. The triple eccentric butterfly valve according to claim 1, characterized in that: A notch is formed on the outer circumference of the butterfly plate, the sealing ring is arranged in the notch, and the outer circumference of the sealing ring protrudes from the outer circumference of the butterfly plate.

8. The triple eccentric butterfly valve according to claim 1, characterized in that: The outer circumferential surface of the sealing ring and the inner circumferential surface of the valve seat are parts of a conical surface in space.

9. A method for manufacturing a triple eccentric butterfly valve, characterized in that: Used to manufacture the triple eccentric butterfly valve according to claim 1; the method comprises: The main valve body, auxiliary valve body and valve seat are manufactured separately; The valve seat is arranged inside the main valve body, and the auxiliary valve body is arranged on the valve seat; The main valve body and the auxiliary valve body are fixedly connected by welding.

10. The method for manufacturing a triple eccentric butterfly valve according to claim 9, characterized in that: The process of manufacturing the main valve body includes: rolling a steel plate to form the main valve body; The process of manufacturing the auxiliary valve body includes: rolling a steel plate to form the auxiliary valve body.

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