High-temperature three-eccentric center butterfly valve with elastic compensation

Abstract

The utility model discloses a high-temperature three-eccentric center butterfly valve with elastic compensation, which comprises a valve body, a butterfly plate arranged in the valve body, a valve rod arranged in the valve body in a penetrating manner and connected with the butterfly plate, a valve cover fixed at the top of the valve body and an end cover fixed at the bottom of the valve body, the thrust washer is supported on the end cover, and a belleville spring is arranged between the thrust washer and the end cover. According to the utility model, the thrust washer and the belleville spring are arranged, and the belleville spring is compressed and extended under different working conditions, so that elastic compensation is provided for the movement of the valve rod. Under the high-temperature working condition, when the valve rod is heated to extend, the belleville spring below the thrust washer can be extruded, a compensation space is reserved for thermal expansion, and the shaft end of the valve rod cannot be tightly ejected; under the normal temperature condition, the thrust washer can abut against the shaft end of the valve rod under the action of the belleville spring, the valve rod is kept at the stable relative position, and therefore it is guaranteed that the valve plate is vertically guided and fixed when the valve is opened and closed.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field especially relates to a high temperature three eccentric butterfly valve with elastic compensation. BACKGROUND

[0002] Three eccentric butterfly valve is a kind of specially designed valve, it realizes high-efficiency fluid control by three eccentric design (valve body, valve rod, valve seat), the sealing performance between butterfly plate and valve seat has been significantly improved, leakage rate is extremely low.Three eccentric butterfly valve is compact, light, corrosion resistance is strong, fluid control ability is strong, and adjustment performance is good, safety is high, and it is widely used in chemical industry, heating, environmental protection, food and pharmaceutical, water treatment and many other fields.

[0003] High temperature three eccentric butterfly valve is suitable for high temperature environment, can withstand higher temperature and pressure, and performance is excellent in fluid control, but high temperature three eccentric butterfly valve is opened, and valve rod first contacts medium under high temperature working condition, and valve rod will first expand by heat, since valve rod and disc plate are connected by pin and cannot be connected in series, valve rod will expand and elongate to two ends, leading to valve rod shaft end extrusion and dead end, cause operating failure. CONTENT OF THE UTILITY MODEL

[0004] The utility model discloses a kind of high temperature three eccentric butterfly valves with elastic compensation, which can avoid valve rod shaft end dead end.

[0005] To achieve the above object, the utility model provides a kind of high temperature three eccentric butterfly valve with elastic compensation, including valve body, the disc plate being installed in the valve body, the valve rod being connected with the disc plate and being penetrated in the valve body, the valve cover being fixed at the top of the valve body and the end cover being fixed at the bottom of the valve body, the bottom of the valve rod is equipped with thrust washer, the thrust washer is supported on the end cover, and disc spring is arranged between the thrust washer and the end cover.

[0006] Further, the top surface of the end cover is provided with a mounting groove, and the thrust washer is located in the mounting groove.

[0007] Further, a limiting groove is formed on the bottom wall of the mounting groove, and a limiting block is arranged on the bottom of the thrust washer, and the limiting block is clamped in the limiting groove.

[0008] Further, a hardened layer is arranged on the top surface of the thrust washer.

[0009] Further, a thrust bearing is arranged on the lower end of the valve rod, a first key groove is formed on the bottom inner side of the thrust bearing, a second key groove is formed on the lower end of the valve rod, and a connecting key is arranged in the first key groove and the second key groove.

[0010] Further, the connecting key is in the shape of a flat waist round block.

[0011] Further, the upper part of the valve stem is sequentially sleeved with a shaft spacer, a sealing ring and an upper bearing from top to bottom, the upper bearing of the valve stem is partially hardened, and a upper dustproof ring is arranged between the lower end of the upper bearing and the valve stem.

[0012] Further, the lower part of the valve stem is sleeved with a lower bearing, the lower bearing of the valve stem is partially hardened, and a lower dustproof ring is arranged between the upper end of the lower bearing and the valve stem.

[0013] Further, the hardening design is realized by spraying or hardening a layer of hardening layer.

[0014] Further, the valve cover is of an elongated structure, the valve stem and the valve cover are sequentially sleeved with a packing pressing plate, a packing and a packing seat from top to bottom, the upper inner circumferential surface of the valve cover is provided with a step, and the packing pressing plate, the packing and the packing seat are located in the step.

[0015] The beneficial effects of the utility model lie in:

[0016] The utility model discloses a thrust washer and disc spring are set, and the elastic compensation is provided for the movement of valve stem through the compression elongation of disc spring under different working conditions. When the valve stem is heated and elongated under high temperature working condition, the disc spring below the thrust washer is extruded, and the compensation space reserved for thermal expansion is not caused to the dead end of valve stem shaft end. Under normal temperature, the thrust washer is tightly pressed to the valve stem shaft end under the action of disc spring, and the relative position of valve stem is kept stable, so that the fixedness of valve plate up and down guide is guaranteed when the valve is opened and closed. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the sectional structure schematic view of high temperature three eccentric butterfly valve of one embodiment of the utility model with elastic compensation.

[0018] Figure 2 It is the enlarged view of A in Figure 1

[0019] Figure 3 It is the structure schematic view of thrust washer in butterfly valve shown in Figure 1

[0020] Figure 4 It is the installation structure partial explosion drawing of thrust washer and disc spring in butterfly valve shown in Figure 1

[0021] Figure 5 It is the installation structure partial explosion drawing of connecting key in butterfly valve shown in Figure 1

[0022] ​​​​Explanation of reference signs: 1, valve body; 2, disc plate; 3, valve rod; 31, second key groove; 4, valve cover; 5, end cover; 51, mounting groove; 52, limiting groove; 6, thrust washer; 61, limiting block; 62, hardening layer; 7, disc spring; 8, thrust bearing; 81, first key groove; 9, connecting key; 10, shaft spacer; 11, sealing ring; 12, upper bearing; 13, upper dustproof ring; 14, lower bearing; 15, lower dustproof ring; 16, packing plate; 17, packing; 18, packing seat; 19, bearing washer. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The embodiments in the present application and the features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0024] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0025] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes A scheme, or B scheme, or A and B schemes. In addition, "multiple" means two or more. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist.

[0026] Reference is made to Figures 1 to 5 .

[0027] The utility model discloses a high temperature three eccentric butterfly valve with elastic compensation, which comprises a valve body 1, a disc plate 2 installed in the valve body 1, a valve rod 3 connected with the disc plate 2 and arranged in the valve body 1, a valve cover 4 fixed on the top of the valve body 1, and an end cover 5 fixed on the bottom of the valve body 1.

[0028] The utility model discloses a thrust washer and disc spring are set up, and the compression elongation of disc spring under different working conditions provides elastic compensation for the movement of valve rod.

[0029] In an embodiment, the top surface of the end cover 5 is provided with a mounting groove 51, and the thrust washer 6 is located in the mounting groove 51.

[0030] In an embodiment, the bottom wall of the mounting groove 51 is provided with a limiting groove 52, and the bottom of the thrust washer 6 is provided with a limiting block 61 which is clamped in the limiting groove 52.

[0031] In specific implementation, the limiting groove 52 and the limiting block 61 can be cuboids or other non-circular cross-section shapes, as long as they can limit the rotation of the thrust washer.

[0032] In an embodiment, the top surface of the thrust washer 6 is provided with a hardened layer 62.

[0033] In an embodiment, the lower end of the valve rod 3 is sleeved with a thrust bearing 8, a first key groove 81 is formed in the bottom inner side of the thrust bearing 8, a second key groove 31 is formed in the lower end of the valve rod 3 at a position corresponding to the first key groove 81, and a connecting key 9 is installed in the first key groove 81 and the second key groove 31. In the prior art, the valve rod and the thrust bearing are not fixedly connected at the connecting position, the movement direction is not accurate, and the connection is unstable. The connecting key is installed in the key grooves, so that the high-precision stable connection between the thrust bearing and the valve rod is ensured, and the thrust bearing can closely and synchronously move with the valve rod, thereby realizing the more accurate thrust function when the valve rod moves upward.

[0034] In the specific implementation, two pairs of connecting keys 9 can be symmetrically arranged on both sides of the valve rod 3 and the thrust bearing 8, and the effect is more reliable. In addition, the top surface of the thrust bearing 8 can be subjected to hardening treatment, so that the surface can stably move relative to the bearing or the spacer sleeve above, thereby ensuring accurate positioning during operation.

[0035] In an embodiment, the connecting key 9 is a flat waist-round block.

[0036] In an embodiment, the upper part of the valve rod 3 is sequentially sleeved with an axle spacer 10, a sealing ring 11 and an upper bearing 12 from top to bottom, the part of the valve rod 3 corresponding to the upper bearing 12 is designed to be hardened, and an upper dustproof ring 13 is arranged between the lower end of the upper bearing 12 and the valve rod 3.

[0037] In an embodiment, the lower part of the valve rod 3 is sleeved with a lower bearing 14, the part of the valve rod 3 corresponding to the lower bearing 14 is designed to be hardened, and a lower dustproof ring 15 is arranged between the upper end of the lower bearing 14 and the valve rod 3.

[0038] In the prior art, the valve rod is designed in one piece, and under high-temperature working conditions, the normal cooperation between the valve rod and the bearing will be affected due to the decrease of the hardness and the mechanical properties of the metal material. If the hardness of the valve rod is too low, the valve rod is easily deformed by the extrusion of the bearing during operation, the cooperation gap between the bearing and the valve rod is increased, and the sealing performance and the transmission accuracy are affected.

[0039] The part of the valve rod corresponding to the upper and lower bearings is designed to be hardened, the hardness difference between the contact surfaces of the valve rod and the bearing is formed, the wear is reduced, a good cooperation relationship is formed, and the reliability of the sealing is ensured.

[0040] The hardening design in the utility model is realized by spraying or welding a layer of hardening layer.

[0041] The hardening layer can be selected from hard alloy such as Stellite alloy, nickel-based alloy, or sprayed tungsten carbide, and the hardness is above HRC40, which is not particularly limited in the utility model.

[0042] In the embodiment, a bearing gasket 19 is arranged between the lower bearing 14 and the thrust bearing 8.

[0043] In an embodiment, the valve cover 4 is of an elongated structure, the valve stem 3 and the valve cover 4 are sequentially sleeved with a packing pressing plate 16, a packing 17 and a packing seat 18 from top to bottom, and the upper inner circumferential surface of the valve cover 4 is provided with a step, and the packing pressing plate 16, the packing 17 and the packing seat 18 are located in the step. The shorter valve cover may be affected by the temperature and pressure of the medium in a high-temperature environment. The valve cover is designed to be elongated (the length can be elongated by 150-600 mm according to the actual working temperature, and the high-temperature medium does not affect the packing sealing, and the utility model is not particularly limited), the multiple sealing structures prevent the high-temperature medium from entering the packing, provide better protection for the packing, reduce the direct impact and erosion of the high-temperature medium on the packing, and thus improve the sealing performance of the valve.

[0044] The above only describes the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A high-temperature triple eccentric butterfly valve with elastic compensation, comprising a valve body, a disc mounted within the valve body, a valve stem passing through the valve body and connected to the disc, a valve cover fixed to the top of the valve body, and an end cover fixed to the bottom of the valve body, characterized in that, The bottom pad of the valve rod is provided with a thrust washer, the thrust washer is supported on the end cover, and a disc spring is arranged between the thrust washer and the end cover; The top surface of the end cover is provided with a mounting groove, and the thrust washer is arranged in the mounting groove; The bottom wall of the mounting groove is provided with a limiting groove, and the bottom of the thrust washer is provided with a limiting block which is clamped in the limiting groove.

2. The high temperature triple offset butterfly valve with elastic compensation of claim 1, wherein, The top surface of the thrust washer is provided with a hardened layer.

3. The high temperature triple offset butterfly valve with elastic compensation according to claim 1 or 2, characterized in that, The lower end of the valve rod is sleeved with a thrust bearing, the inner side of the bottom of the thrust bearing is provided with a first key groove, the lower end of the valve rod is provided with a second key groove at a position corresponding to the first key groove, and a connecting key is arranged in the first key groove and the second key groove.

4. The high temperature triple offset butterfly valve with elastic compensation of claim 3, wherein, The connecting key is a flat waist round block.

5. The high temperature triple offset butterfly valve with elastic compensation according to claim 1 or 2, characterized in that, The upper part of the valve rod is sequentially sleeved with a shaft spacer, a sealing ring and an upper bearing from top to bottom, the part of the valve rod corresponding to the upper bearing is designed to be hardened, and an upper dustproof ring is arranged between the lower end of the upper bearing and the valve rod.

6. The high temperature triple offset butterfly valve with elastic compensation of claim 5, wherein, The lower part of the valve rod is sleeved with a lower bearing, the part of the valve rod corresponding to the lower bearing is designed to be hardened, and a lower dustproof ring is arranged between the upper end of the lower bearing and the valve rod.

7. The high temperature triple offset butterfly valve with elastic compensation of claim 6, wherein, The hardened design is realized by spraying or surfacing a hardened layer.

8. The high temperature triple offset butterfly valve with elastic compensation according to claim 1 or 2, characterized in that, The valve cover is of an elongated structure, the valve rod and the valve cover are sequentially sleeved with a packing pressing plate, a packing and a packing seat from top to bottom, the inner circumferential surface of the upper part of the valve cover is provided with a step, and the packing pressing plate, the packing and the packing seat are arranged in the step.

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