High-temperature two-way sealing butterfly valve

Abstract

The utility model relates to a high-temperature two-way sealing butterfly valve, and relates to the field of valves. According to the technical scheme, an extended valve body, a valve plate, an upper valve shaft and a lower valve shaft are arranged, the valve plate is installed in a flow channel of the valve body, and a water circulation flow guide pipe is installed on the valve plate; the upper valve shaft is installed in an upper shaft hole of the valve body, the upper end of the upper valve shaft is connected with the executing mechanism, and the lower end of the upper valve shaft is connected with the valve plate. The lower valve shaft is mounted in a lower shaft hole of the valve body; the upper end of the lower valve shaft is connected with the valve plate; a valve body water inlet in the lower end of the valve body is communicated with a lower valve shaft water inlet in the lower end of the lower valve shaft, a lower valve shaft water outlet in the upper end of the lower valve shaft is communicated with the lower end of the water circulation flow guide pipe, and the upper end of the water circulation flow guide pipe is communicated with an upper valve shaft water inlet in the lower end of the upper valve shaft. And an upper valve shaft water outlet at the upper end of the upper valve shaft is communicated with a valve body water outlet at the upper end of the valve body. Under the condition, the high-temperature two-way sealing butterfly valve is low in cost and resistant to high temperature.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a high-temperature bidirectional sealing butterfly valve. Background Technology

[0002] Existing triple eccentric butterfly valves face multiple technical bottlenecks in high-temperature environments: First, the valve seat and sealing ring undergo asymmetrical deformation due to differences in their thermal expansion coefficients, leading to excessive dynamic fit clearance and resulting in excessive media leakage. Second, the metal sealing surface undergoes creep relaxation under thermal cycling, reducing the initial preload and causing bidirectional sealing failure. Third, traditional graphite-based sealing materials shrink in high-temperature oxidizing environments, exacerbating the seizing and jamming phenomenon of the sealing pair. These defects necessitate frequent shutdowns for maintenance during the high-temperature service life of the valve, severely restricting the continuous operation capability of the equipment.

[0003] Currently, high-temperature butterfly valves generally employ nickel-based alloys or surface modification technologies, resulting in high raw material costs and processing energy consumption. More importantly, to balance high-temperature strength and thermal shock resistance, existing designs must adopt multi-layer composite structures, leading to an increase in the number of parts and severely weakening the lightweight advantage of butterfly valves. Furthermore, the residual stress generated by the welding process further reduces the fatigue life of the sealing pair, creating a technical dilemma of high cost and low lifespan. Summary of the Invention

[0004] The purpose of this invention is to provide a high-temperature bidirectional sealing butterfly valve to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A high-temperature bidirectional sealing butterfly valve includes a valve body, wherein the valve body is an extended type, and the high-temperature bidirectional sealing butterfly valve further includes:

[0007] A valve plate is installed in the flow channel of the valve body, and a water circulation guide pipe is installed on the valve plate;

[0008] An upper valve shaft is installed in the upper shaft hole of the valve body, its upper end is connected to the actuator, and its lower end is connected to the valve plate; and

[0009] The lower valve shaft is installed in the lower shaft hole of the valve body, and its upper end is connected to the valve plate;

[0010] The valve body inlet at the lower end of the valve body is connected to the lower valve shaft inlet at the lower end of the lower valve shaft. The lower valve shaft outlet at the upper end of the lower valve shaft is connected to the lower end of the water circulation guide pipe. The upper end of the water circulation guide pipe is connected to the upper valve shaft inlet at the lower end of the upper valve shaft. The upper valve shaft outlet at the upper end of the upper valve shaft is connected to the valve body outlet at the upper end of the valve body.

[0011] In one possible implementation, the valve body is provided with a cavity, a plurality of cavity inlets connected to the lower end of the cavity, and a plurality of cavity outlets connected to the upper end of the cavity.

[0012] In one possible implementation, a stuffing box, a support adjusting ring, a compression bushing, and a high-temperature braided packing ring are sequentially provided between the upper valve shaft and the upper shaft hole of the valve body, and between the lower valve shaft and the lower shaft hole of the valve body, along the directions opposite to the upper valve shaft and the lower valve shaft.

[0013] In one possible implementation, limit rings are installed between the upper shaft hole end face of the valve body and the valve plate, and between the lower shaft hole end face of the valve body and the valve plate.

[0014] In one possible implementation, a sealing ring is also mounted on the valve plate, the sealing ring being located on the side of the reverse medium flow.

[0015] In one possible implementation, the stuffing box includes a lower packing, a packing spacer, and an upper packing arranged sequentially along the direction opposite to the upper valve shaft and the lower valve shaft, wherein the packing spacer has small holes evenly distributed on it.

[0016] The small holes on the packing sleeve of the upper valve shaft are connected to the outlet of the upper valve shaft and the outlet of the valve body, respectively; the small holes on the packing sleeve of the lower valve shaft are connected to the inlet of the lower valve shaft and the inlet of the valve body, respectively.

[0017] In one possible implementation, the lower filler and the upper filler are high-temperature oxidation-resistant graphite.

[0018] In one possible implementation, the high-temperature braided packing ring is a dustproof graphite packing.

[0019] In one possible implementation, there is a 2mm gap between the stuffing box and the support adjustment ring.

[0020] In one possible implementation, water ripple grooves are provided on both the inner and outer sides of the clamping bushing.

[0021] The beneficial effects of the technical solution provided by this utility model include at least the following:

[0022] This technical solution includes an extended valve body, valve plate, upper valve shaft, and lower valve shaft. The valve plate is installed within the flow channel of the valve body, and a water circulation guide pipe is mounted on the valve plate. The upper valve shaft is installed within the upper shaft hole of the valve body, with its upper end connected to the actuator and its lower end connected to the valve plate. The lower valve shaft is installed within the lower shaft hole of the valve body, with its upper end connected to the valve plate. The valve body inlet at the lower end of the valve body is connected to the lower valve shaft inlet at the lower end of the lower valve shaft. The lower valve shaft outlet at the upper end of the lower valve shaft is connected to the lower end of the water circulation guide pipe, and the upper end of the water circulation guide pipe is connected to the upper valve shaft inlet at the lower end of the upper valve shaft. The upper valve shaft outlet at the upper end of the upper valve shaft is connected to the valve body outlet at the upper end of the valve body. This provides a low-cost, high-temperature resistant, high-temperature bidirectional sealing butterfly valve. Attached Figure Description

[0023] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0024] Figure 1 A front sectional view of a high-temperature bidirectional sealing butterfly valve provided in an exemplary embodiment of the present invention is shown.

[0025] Figure 2 A side sectional view of a high-temperature bidirectional sealing butterfly valve provided in an exemplary embodiment of the present invention is shown.

[0026] Figure 3 This diagram shows a partially enlarged view of the stuffing gland of a high-temperature bidirectional sealing butterfly valve provided in an exemplary embodiment of the present invention.

[0027] In the picture:

[0028] 1. Valve body; 2. Valve plate; 3. Upper valve shaft; 4. Lower valve shaft; 5. Limiting ring; 6. Stuffing box; 7. Compression bushing; 8. High-temperature braided packing ring; 9. Water circulation guide pipe; 10. Support and adjusting ring; 11. Sealing ring; 12. Actuator;

[0029] 101. Valve body inlet; 102. Valve body outlet; 103. Cavity; 104. Cavity inlet; 105. Cavity outlet;

[0030] 301. Upper valve shaft inlet; 302. Upper valve shaft outlet;

[0031] 401. Lower valve shaft inlet; 402. Lower valve shaft outlet;

[0032] 601, lower packing; 602, packing spacer; 6021, small hole; 603, upper packing. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] In this specification, identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings of this utility model, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions towards or away from a specific component, respectively. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more.

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0036] Figure 1 This illustration shows a main sectional view of a high-temperature bidirectional sealing butterfly valve provided in an exemplary embodiment of the present invention. Figure 2 This illustration shows a side sectional view of a high-temperature bidirectional sealing butterfly valve provided in an exemplary embodiment of the present invention. The high-temperature bidirectional sealing butterfly valve includes an extended valve body 1, a valve plate 2, an upper valve shaft 3, and a lower valve shaft 4. The valve plate 2 is installed within the flow channel of the valve body 1, and a water circulation guide pipe 9 is mounted on the valve plate 2. The upper valve shaft 3 is installed within the upper shaft hole of the valve body 1, with its upper end connected to an actuator 12 and its lower end connected to the valve plate 2. The lower valve shaft 4 is installed within the lower shaft of the valve body 1. Inside the shaft hole, its upper end is connected to the valve plate 2; wherein, the valve body inlet 101 at the lower end of the valve body 1 is connected to the lower valve shaft inlet 401 at the lower end of the lower valve shaft 4, the lower valve shaft outlet 402 at the upper end of the lower valve shaft 4 is connected to the lower end of the water circulation guide pipe 9, the upper end of the water circulation guide pipe 9 is connected to the upper valve shaft inlet 301 at the lower end of the upper valve shaft 3, and the upper valve shaft outlet 302 at the upper end of the upper valve shaft 3 is connected to the valve body outlet 102 at the upper end of the valve body 1.

[0037] In this embodiment, the valve body 1 is an extended type, with its upper and lower extension sections integrated with the valve body. This reduces the assembly interface, ensures uniform distribution of thermal expansion deformation, prevents the sealing surface from failing due to local stress concentration, eliminates the flange sealing interface of traditional split valve bodies, and avoids the risk of leakage caused by the difference in thermal expansion of bolts at high temperatures.

[0038] In this embodiment, cooling water flows in from the valve body inlet 101 at the lower end of the valve body 1, and flows sequentially through the lower valve shaft inlet 401 at the lower end of the lower valve shaft 4, the lower valve shaft outlet 402 at the upper end of the lower valve shaft 4, the lower end of the water circulation guide pipe 9, the upper end of the water circulation guide pipe 9, the upper valve shaft inlet 301 at the lower end of the upper valve shaft 3, and the upper valve shaft outlet 302 at the upper end of the upper valve shaft 3, and finally flows out from the valve body outlet 102 at the upper end of the valve body 1, forming a cooling circulation water path for the valve shaft and valve plate. When the valve shaft expands axially due to the influence of high temperature medium, the risk of the valve shaft driving the valve plate to move to one end is reduced, thereby improving the sealing performance of the valve.

[0039] As a current technology, the actuator of a high-temperature bidirectional sealing butterfly valve refers to a drive device (such as an electric, pneumatic, or hydraulic mechanism) installed on the upper end of the valve body and directly connected to the upper valve shaft. Its function is to drive the upper valve shaft to rotate, thereby causing the valve plate to rotate precisely within the flow channel of the valve body, realizing the opening and closing of the valve and flow control. This actuator needs to have the ability to perform high-precision positioning and stable output torque to ensure that the valve plate can fit tightly against the valve seat under bidirectional medium pressure, maintaining bidirectional sealing performance, while adapting to the thermal expansion compensation requirements under high-temperature and high-pressure conditions, ensuring long-term reliable operation of the valve.

[0040] Furthermore, the valve body 1 is provided with a cavity 103, a plurality of cavity inlets 104 connected to the lower end of the cavity 103, and a plurality of cavity outlets 105 connected to the upper end of the cavity 103.

[0041] In this embodiment, the cavity 103 is welded and fixed to the outer flow channel of the valve body 1. Cooling water flows in from the cavity inlet 104 at the lower end and flows out from the cavity outlet 105 at the upper end, forming a cooling circulation water path for the valve body. This increases the upper limit temperature that the valve body material can withstand, reduces the deformation of the valve seat caused by high temperature, and improves the sealing performance of the valve.

[0042] In one example, there are two cavity inlets 104 and two cavity outlets 105.

[0043] Furthermore, a stuffing box 6, a support adjusting ring 10, a compression bushing 7, and a high-temperature braided packing ring 8 are sequentially provided between the upper valve shaft 3 and the upper shaft hole of the valve body 1, and between the lower valve shaft 4 and the lower shaft hole of the valve body 1, along the opposite directions of the upper valve shaft 3 and the lower valve shaft 4.

[0044] In one example, the high-temperature braided packing ring 8 is a dustproof graphite packing.

[0045] It is worth mentioning that there is a 2mm gap between the stuffing box 6 and the support adjustment ring 10, which is used to adjust the high-temperature braided packing ring 8 on the other side of the compression bushing 7 to prevent impurities in the medium from entering the compression bushing 7 and causing the valve to jam.

[0046] It should be noted that the inner and outer sides of the clamping bushing 7 are provided with water ripple grooves, which facilitates the adhesion of high-temperature grease to the clamping bushing 7, reduces the friction coefficient between the clamping bushing 7 and the valve shaft, and reduces the valve torque.

[0047] Figure 3 This diagram shows a partially enlarged view of the stuffing box of a high-temperature bidirectional sealing butterfly valve provided in an exemplary embodiment of the present invention. The stuffing box 6 includes a lower packing 601, a packing spacer 602, and an upper packing 603 arranged sequentially along the opposite directions of the upper valve shaft 3 and the lower valve shaft 4. The packing spacer 602 has small holes 6021 evenly distributed on it. The small holes 6021 on the packing spacer 602 of the upper valve shaft 3 are respectively connected to the water outlet 302 of the upper valve shaft and the water outlet 102 of the valve body. The small holes 6021 on the packing spacer 602 of the lower valve shaft 4 are respectively connected to the water inlet 401 of the lower valve shaft and the water inlet 101 of the valve body.

[0048] In one example, the lower filler 601 and the upper filler 603 are high-temperature antioxidant graphite.

[0049] Preferably, a layer of braided packing is added to both ends of the lower packing 601 and both ends of the upper packing 603 to form a valve shaft seal.

[0050] From a sealing perspective, the lower packing 601 and upper packing 603 effectively prevent media leakage along the valve shaft, providing basic sealing protection for the valve. The packing spacer 602 serves a separating and regulating function, with its evenly distributed small holes 6021 being crucial. For the upper valve shaft 3, the small holes 6021 connect the upper valve shaft outlet 302 to the valve body outlet 102; for the lower valve shaft 4, the small holes 6021 connect the lower valve shaft inlet 401 to the valve body inlet 101. This interconnected design forms a pressure balance system, allowing cooling water to flow through the packing spacer 602 area, providing cooling and lubrication. On one hand, this reduces the rate of packing aging and wear caused by high temperatures, extending the packing's service life; on the other hand, by balancing pressure, it reduces the impact of the media on the packing, making the sealing performance more stable and reliable, thereby ensuring the overall sealing and stability of the valve during operation.

[0051] In some embodiments, limit rings 5 ​​are installed between the upper shaft hole end face of the valve body 1 and the valve plate 2, and between the lower shaft hole end face of the valve body 1 and the valve plate 2, to ensure that the cantilever between the compression bushing 7 and the sealing pair is zero. When the medium flows in the opposite direction, the valve shaft and the valve plate will not change position and affect the sealing performance. A sealing ring 11 is also installed on the valve plate 2. The sealing ring 11 is located on the side of the reverse medium flow and forms a double sealing line with the valve seat under reverse pressure, thereby improving the reliability of bidirectional sealing.

[0052] Next, the working principle of a high-temperature bidirectional sealing butterfly valve involved in the embodiments of this utility model will be explained.

[0053] This high-temperature bidirectional sealing butterfly valve eliminates thermal stress concentration under high temperatures through an integrated extended valve body. It employs a dual-circulation cooling water system to actively control thermal deformation: the valve shaft-valve plate cooling water system (lower valve shaft → guide pipe → upper valve shaft) and the valve body cavity cooling water system (bottom inlet → top outlet) work together to continuously remove heat from the high-temperature medium, suppressing misalignment of the sealing pair caused by axial expansion of the valve shaft. The layered sealing structure (lower packing-spacer-upper packing) connects to the cooling water system through evenly distributed small holes in the packing spacer, forming a dynamic pressure balance and lubrication interface. Combined with the water-groove grease reservoir design of the pressure bushing, it reduces frictional torque.

[0054] In the embodiments disclosed in this utility model, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this utility model according to the specific circumstances.

[0055] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A high temperature bidirectional sealing butterfly valve comprising a valve body (1), characterized in that, The valve body (1) is elongated, and the high-temperature bidirectional sealing butterfly valve further comprises: a valve plate (2) installed in a flow channel of the valve body (1), wherein a water circulation guide pipe (9) is installed on the valve plate (2); an upper valve shaft (3) installed in an upper shaft hole of the valve body (1), wherein an upper end of the upper valve shaft (3) is connected with an actuator (12), and a lower end of the upper valve shaft (3) is connected with the valve plate (2); and a lower valve shaft (4) installed in a lower shaft hole of the valve body (1), wherein an upper end of the lower valve shaft (4) is connected with the valve plate (2). The valve body water inlet (101) at a lower end of the valve body (1) is connected with the lower valve shaft water inlet (401) at a lower end of the lower valve shaft (4), the lower valve shaft water outlet (402) at an upper end of the lower valve shaft (4) is connected with a lower end of the water circulation guide pipe (9), an upper end of the water circulation guide pipe (9) is connected with the upper valve shaft water inlet (301) at a lower end of the upper valve shaft (3), and the upper valve shaft water outlet (302) at an upper end of the upper valve shaft (3) is connected with the valve body water outlet (102) at an upper end of the valve body (1).

2. The high temperature, bidirectional-sealing butterfly valve of claim 1, wherein, A cavity (103) is arranged on the valve body (1), a plurality of cavity water inlets (104) are connected with a lower end of the cavity (103), and a plurality of cavity water outlets (105) are connected with an upper end of the cavity (103).

3. The high temperature, bidirectional-sealing butterfly valve of claim 1, wherein, Between the upper valve shaft (3) and the upper shaft hole of the valve body (1) and between the lower valve shaft (4) and the lower shaft hole of the valve body (1), a packing gland (6), a support adjusting ring (10), a compression bushing (7) and a high-temperature woven packing ring (8) are sequentially arranged in a direction opposite to the upper valve shaft (3) and the lower valve shaft (4).

4. The high temperature, bidirectional-sealing butterfly valve of claim 1, wherein, A limit ring (5) is installed between an upper shaft hole end surface of the valve body (1) and the valve plate (2) and between a lower shaft hole end surface of the valve body (1) and the valve plate (2).

5. The high temperature, bidirectional-sealing butterfly valve of claim 1, wherein, A sealing ring (11) is further installed on the valve plate (2), and the sealing ring (11) is located on a side of reverse medium flow.

6. The high temperature bi-directional sealing butterfly valve of claim 3, wherein, The packing gland (6) comprises a lower layer packing (601), a packing spacer sleeve (602) and an upper layer packing (603) sequentially arranged in a direction opposite to the upper valve shaft (3) and the lower valve shaft (4), and a plurality of small holes (6021) are uniformly arranged on the packing spacer sleeve (602). The small holes (6021) on the packing spacer sleeve (602) of the upper valve shaft (3) are respectively connected with the upper valve shaft water outlet (302) and the valve body water outlet (102); and the small holes (6021) on the packing spacer sleeve (602) of the lower valve shaft (4) are respectively connected with the lower valve shaft water inlet (401) and the valve body water inlet (101).

7. The high temperature bi-directional sealing butterfly valve of claim 6, wherein, The lower layer packing (601) and the upper layer packing (603) are high-temperature antioxidant graphite.

8. The high temperature bi-directional seal butterfly valve of claim 3, wherein, The high-temperature woven packing ring (8) is a dustproof graphite packing.

9. The high temperature bi-directional seal butterfly valve of claim 3, wherein, A 2mm gap is provided between the packing gland (6) and the support adjusting ring (10).

10. The high temperature bi-directional seal butterfly valve of claim 3, wherein, Water line grooves are arranged on the inner and outer sides of the compression bushing (7).

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