A steam circuit regulating butterfly valve

Abstract

The present invention relates to the technical field of regulating valves, and specifically to a steam circuit regulating butterfly valve, which includes a valve body, a valve plate and a protective member. When steam flows through the valve body, the inner diameter of the valve body is equal to the inner diameter of the steam pipe, reducing the impact of steam on the valve body. The valve plate is fixedly connected to the positioning shaft. If the valve plate and the valve body are required to block the steam pipe, the sealing surface of the valve plate abuts against the sealing ring on the valve body. When the steam pipe needs to be conducted, the positioning shaft is rotated, and the positioning shaft drives the valve plate to rotate inside the valve body. The valve plate gradually disengages from the contact sealing ring during the rotation process. During the rotation of the valve plate, the protective member protects the sealing surface of the valve plate to prevent impurities carried in the flowing steam from impacting the sealing surface of the valve plate. If some impurities in the flowing steam adhere to the sealing surface of the valve plate, the protective member can clean them to ensure that the sealing surface of the valve plate maintains good performance, thereby reducing the probability of sealing failure of the valve plate.

Description

Technical Field

[0001] The invention relates to the technical field of regulating valves, and in particular to a steam circuit regulating butterfly valve. Background Art

[0002] In many industrial fields, the steam circuit system plays a key role. As an important component for controlling steam flow and pressure, the performance of the valve directly affects the operating efficiency and safety of the entire system. The three-eccentric butterfly valve has been widely used in steam circuits due to its compact structure and easy operation.

[0003] The three-eccentric butterfly valve mainly relies on the close contact between the valve plate sealing surface and the valve body to achieve the sealing function. In the initial stage of normal operation, it can effectively control the circulation of steam. After long-term use, on the one hand, the high-temperature steam in the steam circuit will accelerate the oxidation and chemical reaction of the metal material, causing the material performance of the valve plate sealing surface to gradually decline. The impact of the steam constantly wears the valve plate sealing surface. Long-term accumulation leads to damage to the valve plate sealing surface and destroys the integrity of the seal. On the other hand, solid particle impurities inevitably exist in the high-temperature steam. These impurities are easy to adhere to the valve plate sealing surface during the flow of steam. With the continuous accumulation of impurities, it will not only further aggravate the wear of the valve plate sealing surface, but also change the flatness and fit of the valve plate sealing surface, making the originally tight sealing effect greatly reduced. Once the seal between the valve plate sealing surface and the valve body fails, the entire three-eccentric butterfly valve cannot effectively control the leakage of steam, resulting in unstable pressure and flow of the steam circuit system, affecting the normal progress of industrial production. Summary of the invention

[0004] The invention provides a steam circuit regulating butterfly valve to solve the problem that sealing failure is easy to occur during the use of the existing butterfly valve.

[0005] A steam circuit regulating butterfly valve of the present invention adopts the following technical solution:

[0006] A steam circuit regulating butterfly valve comprises a valve body, a valve plate and a protective member.

[0007] The valve body is fixedly arranged on the steam pipe, the inner diameter of the valve body is equal to the inner diameter of the steam pipe, and a sealing ring is fixedly arranged on the inner wall of the valve body; a positioning shaft is arranged on the valve body along the direction of its own diameter, and the positioning shaft can rotate on the valve body; the cross-section of the valve body where the positioning shaft is located and the cross-section of the valve body where the sealing ring is located are arranged at an interval; the valve plate is fixedly connected to the positioning shaft, and the valve plate has an annular sealing surface, and the sealing surface of the valve plate can abut against the sealing ring; the protective member is used to protect the sealing surface of the valve plate when the valve plate is unblocked from the valve body, and the protective member can also clean up impurities attached to the sealing surface of the valve plate; the protective member includes a protective sleeve and a connecting ring, the connecting ring is coaxially fixedly connected to the valve plate, and a connecting member is arranged between the protective sleeve and the connecting ring, when the valve plate is unblocking the valve body, the end face of the protective sleeve is in a state of abutting against the side wall of the sealing ring, and in the process of the valve plate unblocking the valve body, the protective sleeve can move along the axial direction of the valve body, and the protective sleeve gradually changes to a state of being sleeved on the outside of the sealing surface.

[0008] Furthermore, the connecting member includes a driving plate, a first connecting rod and a second connecting rod. The driving plate and the connecting ring are coaxially arranged. The first connecting rod can be telescopically arranged between the driving plate and the connecting ring. The extension direction of the first connecting rod is parallel to the axial direction of the driving plate. There are multiple second connecting rods, and multiple second connecting rods are arranged between the protective cover and the driving plate.

[0009] Furthermore, the protective part also includes an air guide channel and a one-way valve. The air guide channel is arranged inside the protective cover, inside the second connecting rod, inside the driving plate and inside the first connecting rod. The one-way valve is arranged on the first connecting rod. When the first connecting rod is extended, the steam in the steam pipe can enter the air guide channel through the one-way valve. The protective cover is provided with a plurality of blowing ports connecting the external environment and the inside of the air guide channel.

[0010] Furthermore, the one-way valve has an air inlet and an air outlet, the air inlet of the one-way valve is arranged outside the air guide channel, the air outlet of the one-way valve is arranged inside the air guide channel, and a filter is arranged at the air inlet of the one-way valve.

[0011] Furthermore, the first connecting rod includes a first section and a second section, the first section and the second section are both hollow inside, the inner diameter of the first section is equal to the outer diameter of the second section, and the first section and the second section are slidingly connected; a first elastic member is arranged between the first section and the second section, and the first elastic member always has a tendency to drive the first connecting rod to extend.

[0012] Furthermore, a baffle is provided on the inner wall of the valve body, and the baffle can be deformed when squeezed by external force; a baffle is provided on the protective sleeve, and the baffle can squeeze the baffle when the valve plate is sealing or conducting the valve body.

[0013] Furthermore, the baffle has a first inclined surface and a second inclined surface, a first preset angle is formed between the first inclined surface and the inner wall of the valve body, a second preset angle is formed between the second inclined surface and the inner wall of the valve body, and the size of the first preset angle is smaller than the size of the second preset angle; the resistance when the baffle squeezes the first inclined surface is smaller than the resistance when the baffle squeezes the second inclined surface.

[0014] Furthermore, the positioning shaft passes through the side wall of the valve body, and one end of the positioning shaft extending to the outside of the valve body is connected to a rotating ring.

[0015] Furthermore, a sealing ring is provided at the connection between the valve body and the positioning shaft.

[0016] The beneficial effects of the present invention are as follows: a steam circuit regulating butterfly valve of the present invention includes a valve body, a valve plate and a protective member. When steam is transported, in order to facilitate the regulation of steam flow and pressure, the valve body is fixedly arranged on the steam pipeline. When steam flows through the valve body, the inner diameter of the valve body is equal to the inner diameter of the steam pipeline, reducing the impact of steam on the valve body. The valve plate is fixedly connected to the positioning shaft. If the valve plate and the valve body are required to block the steam pipeline, the sealing surface of the valve plate abuts against the sealing ring on the valve body. When the steam pipeline needs to be conducted, the positioning shaft is rotated, and the positioning shaft drives the valve plate to rotate inside the valve body. The valve plate gradually disengages from the contact sealing ring during the rotation process. During the rotation process of the valve plate, the protective member protects the sealing surface of the valve plate to prevent the impurities carried in the flowing steam from impacting the sealing surface of the valve plate. If some impurities in the flowing steam adhere to the sealing surface of the valve plate, the protective member can clean them to ensure that the sealing surface of the valve plate maintains good performance, thereby reducing the probability of sealing failure of the valve plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 A schematic structural diagram of a steam circuit regulating butterfly valve provided in an embodiment of the present invention;

[0019] Figure 2 A front view of a steam circuit regulating butterfly valve provided by an embodiment of the present invention;

[0020] Figure 3 for Figure 2 Sectional view in the AA direction;

[0021] Figure 4 for Figure 3 A partial enlarged view of point B in the middle;

[0022] Figure 5 for Figure 3 A partial enlarged view of point C in the middle;

[0023] Figure 6 A schematic diagram of the structure of a steam circuit regulating butterfly valve provided by an embodiment of the present invention when a valve plate in the valve body is released from blocking;

[0024] Figure 7 A cross-sectional view of a steam circuit regulating butterfly valve provided by an embodiment of the present invention when a valve plate is released from blocking a valve body;

[0025] Figure 8 for Figure 7 A partial enlarged view of point D in the middle.

[0026] In the figure: 110, valve body; 120, sealing ring; 130, valve plate; 140, positioning shaft; 210, protective sleeve; 220, connecting ring; 230, driving plate; 240, first connecting rod; 241, compression spring; 250, second connecting rod; 260, air guide channel; 270, one-way valve; 280, baffle; 281, first inclined surface; 282, second inclined surface; 290, baffle. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 creative work are within the scope of protection of the present invention.

[0028] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0029] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] like Figures 1 to 8 As shown, an embodiment of the present invention provides a steam circuit regulating butterfly valve, which includes a valve body 110, a valve plate 130 and a protective member.

[0031] The valve body 110 is fixedly arranged on the steam pipe. Specifically, a connecting flange is arranged at the end of the valve body 110. The valve body 110 is arranged in the middle of the steam pipe and is fixedly connected to the steam pipe through the connecting flange. The inner diameter of the valve body 110 is equal to the inner diameter of the steam pipe. When the steam flows through the valve body 110, the impact of the steam on the inside of the valve body 110 is reduced, and the service life of the valve body 110 is improved. A sealing ring 120 is fixedly arranged on the inner wall of the valve body 110. The outer diameter of the sealing ring 120 is equal to the inner diameter of the valve body 110. The material of the sealing ring 120 is the same as that of the valve body 110. In order to improve the stability of the connection between the sealing ring 120 and the valve body 110, the sealing ring 120 and the valve body 110 are an integrally formed structure. The valve body 110 is provided with a positioning shaft 140 along the diameter direction thereof. The positioning shaft 140 can rotate on the valve body 110; the cross section of the valve body 110 where the positioning shaft 140 is located is arranged at an interval with the cross section of the valve body 110 where the sealing ring 120 is located. Specifically, in the extending direction of the axis of the valve body 110 , there is a gap between the position where the sealing ring 120 is located and the position where the positioning shaft 140 is located.

[0032] The valve plate 130 is fixedly connected to the positioning shaft 140, and the valve plate 130 has an annular sealing surface, and the sealing surface of the valve plate 130 can abut against the sealing ring 120. Specifically, the valve plate 130 is set to be annular, and the outer diameter of the valve plate 130 is equal to the inner diameter of the sealing ring 120. The valve plate 130 is fixedly connected to the positioning shaft 140. When the steam pipeline needs to transport steam, the positioning shaft 140 is rotated, and the positioning shaft 140 drives the sealing surface of the valve plate 130 to be separated from the abutting sealing ring 120; when the steam pipeline does not need to transport steam, the positioning shaft 140 is rotated, and the positioning shaft 140 drives the sealing surface of the valve plate 130 to abut against the sealing ring 120.

[0033] The protective member is used to protect the sealing surface of the valve plate 130 when the valve plate 130 releases the sealing of the valve body 110. The protective member can also clean the impurities attached to the sealing surface of the valve plate 130. Specifically, when the steam pipeline needs to transport steam, the positioning shaft 140 is rotated. The positioning shaft 140 drives the sealing surface of the valve plate 130 to disengage from the abutment sealing ring 120. The valve plate 130 gradually disengages from the contact sealing ring 120 during the rotation. During the rotation of the valve plate 130, the protective member protects the sealing surface of the valve plate 130 to prevent impurities carried in the flowing steam from impacting the sealing surface of the valve plate 130. If some impurities in the flowing steam adhere to the sealing surface of the valve plate 130, the protective member can clean them.

[0034] A steam circuit regulating butterfly valve of the present invention, when transporting steam, in order to facilitate the regulation of steam flow and pressure, the valve body 110 is fixedly arranged on the steam pipe. When the steam flows through the valve body 110, the inner diameter of the valve body 110 is equal to the inner diameter of the steam pipe, reducing the impact of the steam on the valve body 110. The valve plate 130 is fixedly connected to the positioning shaft 140. If the valve plate 130 and the valve body 110 are needed to seal the steam pipe, the sealing surface of the valve plate 130 abuts against the sealing ring 120 on the valve body 110. When the steam pipeline needs to be opened, the positioning shaft 140 is rotated, and the positioning shaft 140 drives the valve plate 130 to rotate inside the valve body 110. The valve plate 130 gradually disengages from the sealing ring 120 during the rotation. During the rotation of the valve plate 130, the protective component protects the sealing surface of the valve plate 130 to prevent impurities carried in the flowing steam from impacting the sealing surface of the valve plate 130. If some impurities in the flowing steam adhere to the sealing surface of the valve plate 130, the protective component can clean them to ensure that the sealing surface of the valve plate 130 maintains good performance, thereby reducing the probability of sealing failure of the valve plate 130.

[0035] In one embodiment, the protective member includes a protective sleeve 210 and a connecting ring 220. The connecting ring 220 is coaxially fixedly connected to the valve plate 130. There is a gap between the connecting ring 220 and the valve plate 130. It is easy to understand that the connecting ring 220 and the valve plate 130 are spaced apart, and the connecting ring 220 and the positioning shaft 140 are in an indirect fixed connection state. A connecting member is provided between the protective sleeve 210 and the connecting ring 220. When the valve plate 130 blocks the valve body 110, the end face of the protective sleeve 210 is in a state of abutting against the side wall of the sealing ring 120. In the process of the valve plate 130 unblocking the valve body 110, the protective sleeve 210 can move along the axial direction of the valve body 110, and the protective sleeve 210 gradually changes to a state of being sleeved outside the sealing surface. Furthermore, the inner diameter of the protective sleeve 210 is slightly larger than the outer diameter of the valve plate 130. When the sealing surface of the valve plate 130 is in contact with the sealing ring 120, the end face of the protective sleeve 210 is in contact with the side wall of the sealing ring 120. During the rotation of the valve plate 130, the rotation of the protective sleeve 210 is hindered by the side wall of the sealing ring 120, so that the protective sleeve 210 moves along its own axial direction, and the gap between the protective sleeve 210 and the positioning shaft 140 changes, so that the protective sleeve 210 is no longer hindered by the sealing ring 120. At this time, the protective sleeve 210 moves along its own axial direction again until the protective sleeve 210 is sleeved on the outside of the sealing surface of the valve plate 130, thereby protecting the sealing surface of the valve plate 130 when steam flows.

[0036] In one embodiment, the connecting member includes a driving plate 230, a first connecting rod 240 and a second connecting rod 250. The driving plate 230 is coaxially arranged with the connecting ring 220. The first connecting rod 240 can be telescopically arranged between the driving plate 230 and the connecting ring 220. The extension direction of the first connecting rod 240 is parallel to the axial direction of the driving plate 230. By setting the first connecting rod 240 as a telescopic structure, when the valve plate 130 changes from a state of blocking the valve body 110 to a state of unblocking the valve body 110, the protective sleeve 210 needs to move along its own axial direction. At this time, the first connecting rod 240 contracts. When the first connecting rod 240 contracts, the gap between the connecting ring 220 and the driving plate 230 is reduced, thereby ensuring that the protective sleeve 210 can move smoothly along its own axial direction. A plurality of second connecting rods 250 are provided, and the plurality of second connecting rods 250 are provided between the protective cover 210 and the driving plate 230. By providing a plurality of second connecting rods 250, the movement of the protective cover 210 can be smoothly transmitted to the driving plate 230. Accordingly, the movement of the driving plate 230 is transmitted by the second connecting rods 250, and the protective cover 210 can move synchronously.

[0037] In one embodiment, the protective member also includes an air guide channel 260 and a one-way valve 270. The air guide channel 260 is arranged inside the protective cover 210, inside the second connecting rod 250, inside the driving plate 230 and inside the first connecting rod 240. Specifically, the interior of the protective cover 210 is hollow, the interior of the second connecting rod 250 is hollow, the interior of the driving plate 230 is hollow, and the interior of the first connecting rod 240 is hollow. The hollow chambers inside the protective cover 210, the second connecting rod 250, the driving plate 230 and the first connecting rod 240 are connected to each other, and a connected air guide channel 260 is formed inside the protective cover 210, the second connecting rod 250, the driving plate 230 and the first connecting rod 240. The one-way valve 270 is disposed on the first connecting rod 240. When the first connecting rod 240 is extended, the steam in the steam pipe can enter the interior of the air guide channel 260 through the one-way valve 270. On the contrary, when the first connecting rod 240 is shortened, the gas in the air guide channel 260 cannot enter the steam pipe through the one-way valve 270. The protective cover 210 is provided with a plurality of blowing ports connecting the external environment and the interior of the air guide channel 260. It is easy to understand that when the first connecting rod 240 is extended, the steam in the steam pipe can enter the interior of the air guide channel 260 through the one-way valve 270; when the first connecting rod 240 is shortened, the gas in the air guide channel 260 is discharged from the air guide channel 260 through the blowing ports.

[0038] Furthermore, when the valve plate 130 changes from the state of blocking the valve body 110 to the state of unblocking the valve body 110, the protective sleeve 210 needs to move along its own axis. At this time, the first connecting rod 240 contracts, and the gas in the air guide channel 260 is discharged from the air guide channel 260 through the air blowing port. The gas flowing out of the air blowing port acts on the sealing surface of the valve plate 130 and the sealing ring 120 of the valve body 110. The gas flowing out of the air blowing port cleans the sealing surface of the valve plate 130 and the sealing ring 120 of the valve body 110. When the valve plate 130 unblocks the valve body 110, the first connecting rod 240 actively resets and extends. When the first connecting rod 240 extends, the steam in the steam pipe can enter the inside of the air guide channel 260 through the one-way valve 270, thereby replenishing the air in the air guide channel 260.

[0039] In one embodiment, the one-way valve 270 has an air inlet and an air outlet, the air inlet of the one-way valve 270 is arranged outside the air guide channel 260, the air outlet of the one-way valve 270 is arranged inside the air guide channel 260, and a filter is arranged at the air inlet of the one-way valve 270. By arranging the filter at the air inlet of the one-way valve 270, when the air guide channel 260 is replenished with air, particles in the steam are prevented from entering the air guide channel 260, thereby preventing particles carried in the gas flowing out of the blowing port from damaging the sealing surface of the valve plate 130 and the sealing ring 120 of the valve body 110.

[0040] In one embodiment, the first connecting rod 240 includes a first section and a second section, the first section and the second section are both hollow inside, the inner diameter of the first section is equal to the outer diameter of the second section, and the first section and the second section are slidably connected; a first elastic member is arranged between the first section and the second section, and the first elastic member always has a tendency to drive the first connecting rod 240 to extend. Specifically, the first elastic member is a compression spring 241, and the axial direction of the compression spring 241 is the same as the axial direction of the first connecting rod 240. One end of the compression spring 241 is fixedly connected to the first section, and the other end of the compression spring 241 is fixedly connected to the second section. The compression spring 241 is always in a compressed state. Under the action of the compression spring 241, the first connecting rod 240 always has a tendency to stretch, and the protective sleeve 210 has a tendency to approach the valve plate 130. When the valve plate 130 changes from a state of blocking the valve body 110 to a state of unblocking the valve body 110, the first connecting rod 240 is shortened first. When the sealing ring 120 on the valve body 110 does not hinder the protective sleeve 210, the first connecting rod 240 quickly stretches, so that the protective sleeve 210 quickly changes to a state of being sleeved on the outside of the sealing surface of the valve plate 130.

[0041] In one embodiment, a baffle 280 is provided on the inner wall of the valve body 110, and the baffle 280 can be deformed when being squeezed by an external force; a stopper 290 is provided on the protective sleeve 210, and the stopper 290 can squeeze the baffle 280 when the valve plate 130 is blocking or conducting the valve body 110. Specifically, when the baffle 280 is deformed, an appropriate squeezing force is required. When the valve plate 130 is in the state of blocking the valve body 110, the stopper 290 is in the state of abutting against the baffle 280, and at this time, the stopper 290 does not squeeze the baffle 280. When the valve plate 130 changes from the state of blocking the valve body 110 to the state of unblocking the valve body 110, the block 290 squeezes the baffle 280. When the protective sleeve 210 is no longer blocked by the sealing ring 120, the block 290 squeezes the baffle 280 to deform it, so that the baffle 280 no longer blocks the block 290. When the valve plate 130 changes from the state of unblocking the valve body 110 to the state of blocking the valve body 110, the partial end face of the protective sleeve 210 first contacts the side wall of the sealing ring 120 of the valve body 110. As the protective sleeve 210 rotates, the protective sleeve 210 is partially blocked by the sealing ring The side wall of 120 is squeezed, so that the first connecting rod 240 is shortened first. As the valve body 110 continues to rotate, the block 290 on the protective sleeve 210 contacts the baffle 280 again. At this time, the baffle 280 blocks the block 290, and the first connecting rod 240 is further compressed. When the valve plate 130 is about to block the valve body 110, the baffle 280 is squeezed and deformed by the block 290, so that the baffle 280 no longer blocks the block 290, and the valve plate 130 gradually returns to the state of blocking the valve body 110. At the same time, the protective sleeve 210 is transformed into a state of abutting the sealing ring 120.

[0042] In one embodiment, the baffle 280 has a first inclined surface 281 and a second inclined surface 282, a first preset angle is formed between the first inclined surface 281 and the inner wall of the valve body 110, and a second preset angle is formed between the second inclined surface 282 and the inner wall of the valve body 110, and the size of the first preset angle is smaller than the size of the second preset angle; the resistance when the block 290 squeezes the first inclined surface 281 is smaller than the resistance when the block 290 squeezes the second inclined surface 282. Specifically, when the valve plate 130 changes from a state of blocking the valve body 110 to a state of unblocking the valve body 110, the block 290 contacts the first inclined surface 281 of the baffle 280, and when the valve plate 130 changes from a state of unblocking the valve body 110 to a state of blocking the valve body 110, the block 290 contacts the second inclined surface 282 of the baffle 280. By limiting the baffle 280, it is ensured that when the valve plate 130 changes from a state of unblocking the valve body 110 to a state of blocking the valve body 110, the shortening time of the first connecting rod 240 increases, thereby extending the time for gas to flow out of the blowing port, and the time for gas in the air guide channel 260 to be discharged from the air guide channel 260 through the blowing port increases, thereby ensuring that the degree of cleaning of the sealing surface of the valve plate 130 and the sealing ring 120 of the valve body 110 by the gas flowing out of the blowing port increases.

[0043] In one embodiment, the positioning shaft 140 passes through the side wall of the valve body 110 , and one end of the positioning shaft 140 extending to the outside of the valve body 110 is connected to a rotating ring. By providing the rotating ring, the convenience of rotating the positioning shaft 140 is improved.

[0044] In one embodiment, a sealing ring is provided at the connection between the valve body 110 and the positioning shaft 140 , and the sealing ring can prevent steam from leaking from the gap between the positioning shaft 140 and the valve body 110 .

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A steam circuit regulating butterfly valve, characterized in that: include: The valve body is fixedly arranged on the steam pipe, the inner diameter of the valve body is equal to the inner diameter of the steam pipe, and a sealing ring is fixedly arranged on the inner wall of the valve body; a positioning shaft is arranged on the valve body along the direction of its own diameter, and the positioning shaft can rotate on the valve body; the cross section of the valve body where the positioning shaft is located is spaced from the cross section of the valve body where the sealing ring is located; A valve plate, the valve plate is fixedly connected to the positioning shaft, the valve plate has an annular sealing surface, and the sealing surface of the valve plate can abut against the sealing ring; Protective parts, which are used to protect the sealing surface of the valve plate when the valve plate is released from blocking the valve body. The protective parts can also clean the impurities attached to the sealing surface of the valve plate; The protective part includes a protective sleeve and a connecting ring. The connecting ring is coaxially fixedly connected to the valve plate. A connecting part is arranged between the protective sleeve and the connecting ring. When the valve plate blocks the valve body, the end face of the protective sleeve is in a state of abutting against the side wall of the sealing ring. During the process of the valve plate releasing the sealing of the valve body, the protective sleeve can move along the axial direction of the valve body, and the protective sleeve gradually changes into a state of being sleeved on the outside of the sealing surface.

2. A steam circuit regulating butterfly valve according to claim 1, characterized in that: The connecting member includes a driving plate, a first connecting rod and a second connecting rod. The driving plate and the connecting ring are coaxially arranged. The first connecting rod can be telescopically arranged between the driving plate and the connecting ring. The extension direction of the first connecting rod is parallel to the axial direction of the driving plate. There are multiple second connecting rods, and multiple second connecting rods are arranged between the protective cover and the driving plate.

3. A steam circuit regulating butterfly valve according to claim 2, characterized in that: The protective part also includes an air guide channel and a one-way valve. The air guide channel is arranged inside the protective cover, inside the second connecting rod, inside the driving plate and inside the first connecting rod. The one-way valve is arranged on the first connecting rod. When the first connecting rod is extended, the steam in the steam pipe can enter the air guide channel through the one-way valve. The protective cover is provided with multiple blowing ports connecting the external environment and the inside of the air guide channel.

4. A steam circuit regulating butterfly valve according to claim 3, characterized in that: The one-way valve has an air inlet and an air outlet. The air inlet of the one-way valve is arranged outside the air guide channel, and the air outlet of the one-way valve is arranged inside the air guide channel. A filter is arranged at the air inlet of the one-way valve.

5. The steam circuit regulating butterfly valve according to claim 3, characterized in that: The first connecting rod includes a first section and a second section. The first section and the second section are both hollow inside. The inner diameter of the first section is equal to the outer diameter of the second section. The first section and the second section are slidably connected. A first elastic member is arranged between the first section and the second section. The first elastic member always has a tendency to drive the first connecting rod to extend.

6. The steam circuit regulating butterfly valve according to claim 1, characterized in that: A baffle is arranged on the inner wall of the valve body, and the baffle can be deformed when squeezed by external force; a baffle is arranged on the protective sleeve, and the baffle can squeeze the baffle when the valve plate is sealing or conducting the valve body.

7. A steam circuit regulating butterfly valve according to claim 6, characterized in that: The baffle has a first inclined surface and a second inclined surface, a first preset angle is formed between the first inclined surface and the inner wall of the valve body, a second preset angle is formed between the second inclined surface and the inner wall of the valve body, and the first preset angle is smaller than the second preset angle; The resistance when the stopper squeezes the first inclined surface is smaller than the resistance when the stopper squeezes the second inclined surface.

8. The steam circuit regulating butterfly valve according to claim 1, characterized in that: The positioning shaft passes through the side wall of the valve body, and one end of the positioning shaft extending to the outside of the valve body is connected with a rotating ring.

9. A steam circuit regulating butterfly valve according to claim 8, characterized in that: A sealing ring is arranged at the connection between the valve body and the positioning shaft.

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