Multi-blow-out prevention valve rod structure of three-eccentric center butterfly valve

Abstract

The utility model relates to the technical field of butterfly valves, in particular to a multiple blow-out prevention valve rod structure of a three-eccentric center butterfly valve. Comprising a valve body, a butterfly plate, a valve rod, a pin shaft, a bearing and a gearbox, the valve rod penetrates through the valve body, the bearing is arranged between the valve rod and the valve body, the butterfly plate is arranged in the valve body and connected with the middle of the valve rod through the pin shaft, and the upper end of the valve rod is connected with the gearbox; the double-end-face ball valve further comprises a pressing ring, a valve seat sealing ring, an end cover, a bolt, a bearing, padding, a thrust backing ring, a pressing sleeve, a check ring, a pressing plate, an upper shaft split ring, a lower shaft split ring, a stud and a nut. According to the three-eccentric center butterfly valve, the working principle of the three-eccentric center butterfly valve is utilized, multiple anti-blow-out structures are designed, friction between the valve plate and the sealing ring is reduced, the sealing effect is improved, it is ensured that the valve is tightly attached when closed, zero leakage is achieved, a guarantee is provided for basic blow-out prevention through lower shaft blow-out prevention, and safety guarantee can still be provided when the portion above the middle section of the valve rod is overloaded and forged to be cracked and the portion above the upper shaft blow-out prevention is achieved; and the valve rod is ensured not to blow out under various working conditions.

Description

TECHNICAL FIELD

[0001] The utility model belongs to butterfly valve field, concretely relates to a kind of multiple blowout-preventing valve stem structures of three eccentric butterfly valve. BACKGROUND

[0002] The butterfly valve can be used to control the flow of air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive medium, etc. In the pipeline, it mainly plays the role of cutting off and throttling. The existing conventional three eccentric butterfly valve has the problem of unreasonable design of valve stem blowout-preventing structure, and the valve stem is easy to blow out under pressure, causing accidents. CONTENT OF UTILITY MODEL

[0003] To make up for the problems of the prior art, the utility model aims to provide a kind of multiple blowout-preventing valve stem structures of three eccentric butterfly valve, which ensures that the valve stem will not blow out under various working conditions by designing multiple blowout-preventing structures.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0005] A kind of multiple blowout-preventing valve stem structures of three eccentric butterfly valve, including valve body, butterfly plate, valve stem, pin shaft, bearing, gear box, the valve body is equipped with conical sealing surface;The valve stem is arranged through the valve body, and bearing is arranged between the valve stem and the valve body, the butterfly plate is connected with the middle part of the valve stem by pin shaft, and the upper end of the valve stem is connected with the gear box;It is characterized by further comprising compression ring, valve seat sealing ring, end cover, bolt, bearing, packing, thrust washer, pressure sleeve, check ring, pressing plate, upper shaft split ring, lower shaft split ring, stud, nut;

[0006] The lower shaft part of the valve stem is provided with a step, and the lower shaft part of the valve stem is further provided with a lower shaft split ring;The check ring and the thrust washer are arranged between the lower end of the valve body and the lower end of the valve stem;The check ring is in abutment with the lower shaft split ring, and the thrust washer is in abutment with the step of the valve body;The sealing ring is connected with the two ends of the butterfly plate through the compression ring, and a contact seal is formed between the butterfly plate and the conical sealing surface of the valve body;The packing is arranged between the upper part of the valve stem and the valve body, the packing is encapsulated between the valve stem and the valve body by the pressure sleeve, the upper shaft part of the valve body is provided with an upper shaft split ring, the pressure plate is sleeved on the outside of the upper shaft split ring, the pressure plate is in abutment with the pressure sleeve, and the pressure plate is fixedly connected with the upper end of the valve body by the stud and the nut.

[0007] Further, the pin shaft between the valve stem and the butterfly plate is at least two.

[0008] Further, the pin shaft is fixedly connected on the butterfly plate by sealing welding.

[0009] The present application has the following advantages:

[0010] The application utilizes the working principle of the three eccentric butterfly valve, and is provided with the blow-out prevention structure of the lower section of the valve rod, the blow-out prevention structure of the middle section of the valve rod and the blow-out prevention structure of the upper section of the valve rod, that is, the multiple blow-out prevention structures are designed to reduce the friction between the valve plate and the sealing ring, improve the sealing effect, ensure that the valve is tightly closed when the valve is closed, realize zero leakage, and provide protection for the basic blow-out prevention of the lower shaft, and the upper shaft blow-out prevention can still provide safety protection when the middle section of the valve rod is overloaded and is cracked, so that the valve rod will not blow out under various working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a structural schematic view of the utility model;

[0012] Figure 2 It is a blow-out prevention structure schematic view of the upper section of the valve rod;

[0013] Figure 3 It is a blow-out prevention structure schematic view of the middle section of the valve rod;

[0014] Figure 4 It is a blow-out prevention structure schematic view of the lower section of the valve rod;

[0015] In the drawing: 1, valve body; 2, butterfly plate; 3, valve rod; 4, pin shaft; 5, pressure ring; 6, valve seat sealing ring; 7, end cover; 8, bolt; 9, bearing; 10, packing; 12, thrust washer; 13, pressure sleeve; 14, check ring; 15, pressing plate; 16, upper shaft split ring; 17, lower shaft split ring; 18, stud; 19, nut; 20, gear box DETAILED DESCRIPTION

[0016] The application will be described in detail below in combination with the drawings, but it should be understood that these descriptions are only exemplary, and the specific embodiments described herein are only used to illustrate and explain the utility model, and are not intended to limit the scope of the application. In addition, in the following description, the description of the structure and technical common knowledge is omitted to avoid unnecessary confusion of the concept of the application.

[0017] Example 1: in combination with the drawings Figures 1-4 The application discloses a three eccentric butterfly valve multiple blow-out prevention valve rod structure, which comprises a valve body 1, a butterfly plate 2, a valve rod 3, a pin shaft 4, a bearing 9 and a gear box 20, the valve body 1 is provided with a conical sealing surface; the valve body 1 is provided with the valve rod 3 in a penetrating mode, the bearing 9 is arranged between the valve rod 3 and the valve body 1, the valve body 1 is provided with the butterfly plate 2, the butterfly plate 2 is connected with the middle part of the valve rod 3 through the pin shaft 4, and the upper end of the valve rod 3 is connected with the gear box 20; characterized by further comprising a pressure ring 5, a valve seat sealing ring 6, an end cover 7, a bolt 8, the bearing 9, packing 10, a thrust washer 12, a pressure sleeve 13, a check ring 14, a pressing plate 15, an upper shaft split ring 16, a lower shaft split ring 17, a stud 18 and a nut 19.

[0018] The lower shaft part of the valve rod 3 is provided with a step, and the lower shaft part of the valve rod 3 is further provided with a lower shaft split ring 17; the lower end of the valve body 1 and the lower end of the valve rod 3 are provided with a check ring 14 and a thrust washer 12; the check ring 14 abuts against the lower shaft split ring 17, and the thrust washer 12 abuts against the step of the valve body 1; the upward thrust of the valve rod 3 under the action of the medium is transmitted to the step of the valve body 1 by the lower shaft split ring 17, the check ring 14 and the thrust washer 12, thereby forming a first heavy blowout prevention structure;

[0019] The sealing ring 6 is connected with both ends of the butterfly plate 2 through the compression ring 5, and a contact seal is formed between the butterfly plate 2 and the conical sealing surface of the valve body 1; the upward thrust of the valve rod 3 under the action of the medium is transmitted to the conical sealing surface of the valve body 1 by the butterfly plate 2, the compression ring 5 and the sealing ring 6, thereby forming a second heavy blowout prevention structure;

[0020] The upper part of the valve rod 3 and the valve body 1 are provided with a packing 10, the packing 10 is encapsulated between the valve rod 3 and the valve body 1 through a compression sleeve 13, the upper shaft part of the valve body 1 is provided with an upper shaft split ring 16, the upper shaft split ring 16 is sleeved with a pressing plate 15 on the outside, the pressing plate 15 abuts against the compression sleeve 13, and the pressing plate 15 is fixedly connected with the upper end of the valve body 1 through a stud 18 and a nut 19; the upward thrust of the valve rod 3 under the action of the medium is transmitted to the upper shaft split ring 16, the pressing plate 15, the stud 18 and the nut 19 through the valve rod 3, thereby forming a third heavy blowout prevention structure.

[0021] Further, the pin shaft 4 between the valve rod 3 and the butterfly plate 2 is at least two.

[0022] Further, the pin shaft 4 is fixedly connected on the butterfly plate 2 through sealing welding.

[0023] The above embodiments are only for illustrating the technical concept and characteristics of the utility model, and the purpose is to enable persons skilled in the art to understand the content of the utility model and implement it, and it cannot limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit and essence of the utility model shall be covered within the protection scope of the utility model.

Claims

1. A triple offset butterfly valve multiple blowout-proof stem structure, comprising a valve body (1), a butterfly plate (2), a valve stem (3), a pin shaft (4), a bearing (9), a gear box (20), the valve body (1) is provided with a tapered sealing surface; the valve body (1) is provided with a valve stem (3) penetratingly, a bearing (9) is arranged between the valve stem (3) and the valve body (1), the valve body (1) is provided with a butterfly plate (2), the butterfly plate (2) is connected with the middle part of the valve stem (3) through a pin shaft (4), and the upper end of the valve stem (3) is connected with the gear box (20); characterized in that: Also include the gland (5), valve seat sealing ring (6), end cover (7), bolts (8), bearings (9), packing (10), thrust washer (12), pressure sleeve (13), check ring (14), pressure plate (15), upper shaft split ring (16), lower shaft split ring (17), stud (18), nut (19); The lower shaft part of the valve stem (3) is provided with a step, and the lower shaft part of the valve stem (3) is also provided with a lower shaft split ring (17); The lower end of the valve body (1) and the lower end of the valve stem (3) are provided with a check ring (14) and a thrust washer (12); The check ring (14) abuts against the lower shaft split ring (17), and the thrust washer (12) abuts against the step of the valve body (1); The sealing ring (6) is connected with the butterfly plate (2) at both ends through the gland (5), and the butterfly plate (2) and the conical sealing surface of the valve body (1) form a contact seal; The upper part of the valve stem (3) and the valve body (1) are provided with packing (10), which is packaged between the valve stem (3) and the valve body (1) through the pressure sleeve (13), the upper shaft part of the valve body (1) is provided with an upper shaft split ring (16), the upper shaft split ring (16) is sleeved with a pressure plate (15) outside, the pressure plate (15) abuts against the pressure sleeve (13), and the pressure plate (15) is fixedly connected with the upper end of the valve body (1) through the stud (18) and the nut (19).

2. The triple offset butterfly valve multiple blowout proof stem construction of claim 1 further characterized by: The pin shaft (4) between the valve stem (3) and the butterfly plate (2) is at least 2.

3. The triple offset butterfly valve multiple blowout proof stem construction of claim 2 further characterized by: The pin shaft (4) is fixedly connected on the butterfly plate (2) by sealing welding.

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