A self-operated regulating valve for high temperature gas

Abstract

The present invention discloses a self-operated regulating valve for high-temperature gas, which relates to the technical field of regulating valves. The valve is based on a conventional pressure regulating valve. Since the pressure of high-temperature gas fluctuates due to the influence of its own temperature environment, the conventional regulating valve structure is improved in this regard, which is manifested in that an action component is added to the valve core block. The action component is based on a corrugated air pressure tube and an inner cooperative rod. When the valve core block maintains vertical movement, the inner cooperative block performs secondary movement with the change of the internal pressure of the valve body, and during the pressure conversion process of the corrugated air pressure tube and the air film sleeve, the upper pressure plate provides downward pressure to the limiting block. The purpose is to achieve adaptive movement of the valve core block through the secondary sliding process without affecting the medium pressure, and to perform free opening adjustment on the basis of maintaining the process requirements for the internal opening of the valve body.

Description

Technical Field

[0001] The present invention relates to the technical field of regulating valves, and in particular to a self-operated regulating valve for high-temperature gas. Background Art

[0002] Pressure regulating valves are mainly used in regulating structures of media such as gas or liquid, and are used to directly change the pressure of the medium. Further improvements to the regulating valves are required based on the physical or chemical properties of the medium. Please refer to the relevant contents in publication numbers CN116677807A and CN118564703A.

[0003] Taking high-temperature gas (high-temperature steam) as an example, pressure adjustment is required according to relevant parameters. However, it should be noted that the pressure of the high-temperature gas itself fluctuates, and the influence of the high-temperature environment will further interfere with the pressure. For example, when the pressure of the high-temperature gas is in a relatively constant state, combined with the ideal gas equation, it can be understood that the actual pressure of the high-temperature gas increases due to temperature, which will further affect the pressure adjustment process and increase the workload of the sealing structure in the valve stem. This application proposes a solution to this problem. Summary of the Invention

[0004] The purpose of the present invention is to provide a self-operated regulating valve for high-temperature gas, and the invention is described with reference to a pressure regulating valve used for high-temperature gas. Because high-temperature gas is affected by the high-temperature environment, its actual pressure is significantly higher than the high-temperature gas's own pressure. This process will directly affect the pressure regulation process and also increase the workload of the sealing structure in the valve stem.

[0005] The object of the present invention can be achieved by the following technical solution: A self-operated regulating valve for high-temperature gas, comprising a valve body, a valve core block, and an actuator, wherein the actuator is equipped with an upper valve stem arranged downward, the valve core block is located inside the valve body and a lower valve stem is installed at the center point of the upper end, and an action assembly is provided between the upper valve stem and the lower valve stem;

[0006] The action component includes a corrugated air pressure tube, an air film sleeve, and a limit block. The upper end of the valve body is respectively installed with a fixed sleeve and a second-order sleeve corresponding to the corrugated air pressure tube and the air film sleeve from bottom to top. The lower valve stem passes through the valve body and the fixed sleeve upward, and the upper end of the lower valve stem is connected to the limit block. A vertically arranged inner cooperating rod is slidably installed inside the lower valve stem, and the upper end of the inner cooperating rod is connected to the lower end of the corrugated air pressure tube.

[0007] It is further configured as follows: a pressure cone cap is installed on the lower end of the inner cooperative rod, the upper end of the corrugated air pressure tube is fixedly connected to the internal upper end of the fixed sleeve, and the lower end of the corrugated air pressure tube is slidably connected to the inner wall of the fixed sleeve.

[0008] It is further configured as follows: an oblique wedge block corresponding to the direction limiting block is installed at the lower end position inside the fixing sleeve, and the cross section of the direction limiting block is truncated cone-shaped.

[0009] It is further configured as follows: a connecting spring is installed at the lower end of the limiting block, and the lower end of the connecting spring is installed in the inner wall of the fixing sleeve.

[0010] It is further configured as follows: an upper pressure plate is slidably installed at a middle position of the fixed sleeve corresponding to the corrugated air pressure tube and the limiting block, and the upper pressure plate is slidably connected to the inner cooperating rod.

[0011] It is further configured as follows: the air film sleeve is arranged in the internal position of the second-order sleeve, and the air film sleeve is located in the middle position of the upper valve stem, the upper end position of the upper valve stem and the second-order sleeve are fixedly connected, and the lower end position of the upper valve stem and the upper end position of the fixed sleeve are slidingly connected, and the lower valve stem and the lower end position of the fixed sleeve are slidingly connected.

[0012] It is further configured as follows: the interior of the lower end portion of the upper valve stem is hollow, and the interior of the air film sleeve is communicated with the interior of the corrugated air pressure tube through the upper valve stem.

[0013] It is further configured as follows: the internal space of the fixed sleeve corresponding to the corrugated air pressure tube and the upper pressure plate is configured as a back pressure chamber, a vent pipe is installed on the external position of the second-order sleeve and the fixed sleeve, and the interior of the air film sleeve is connected to the interior of the back pressure chamber through the vent pipe.

[0014] The present invention has the following beneficial effects:

[0015] 1. Based on a conventional pressure regulating valve, the present invention addresses the phenomenon that high-temperature gas experiences fluctuations in its own pressure environment due to the influence of the temperature environment. The present invention improves the structure of the conventional pressure regulating valve. Specifically, the present invention improves the valve core block's actuating assembly, which comprises a bellows, an inner cooperating rod, and an air film sleeve. While the valve core block maintains its normal opening via an actuator, the inner cooperating rod undergoes a secondary sliding process relative to the lower valve stem. The pressure source during the sliding of the inner cooperating rod is derived from the medium pressure. During this process, the high-temperature gas within the valve body does not directly act on the actuator and the actuating assembly. However, the key lies in the pressure conversion process through the bellows and the air film sleeve, in which the pressure change is reversely applied directly to the upper pressure plate, providing downward pressure on the limiting block. Consequently, during operation, the valve core block maintains its basic opening, but, under the influence of pressure fluctuations, undergoes multiple irregular secondary sliding processes, specifically for varying the valve core block's opening and achieving autonomous regulation of the medium's discharge pressure.

[0016] 2. Based on the above content, the overall structure is based on a conventional pressure regulating valve. In order to realize the above-mentioned secondary sliding process, it is specifically aimed at the connection method of the upper valve stem and the lower valve stem relative to the second-order sleeve and the fixed sleeve. The lower valve stem cooperates with the inner cooperative rod to realize the above-mentioned secondary sliding and further adjust the opening of the valve core block. 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 following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0018] Figure 1 This is a structural schematic diagram of a self-operated regulating valve for high-temperature gas proposed by the present invention;

[0019] Figure 2 The present invention proposes a self-operated regulating valve for high temperature gas Figure 1 sectional view of

[0020] Figure 3 This is a cross-sectional view of a valve body in a self-operated regulating valve for high-temperature gas proposed by the present invention;

[0021] Figure 4 This is a cutaway and exploded view of an actuating component in a self-operated regulating valve for high-temperature gas proposed by the present invention;

[0022] Figure 5 The present invention proposes a self-operated regulating valve for high temperature gas Figure 4 Split diagram of ;

[0023] Figure 6 The present invention proposes a self-operated regulating valve for high temperature gas Figure 4 Cutaway view of the action assembly.

[0024] In the figure: 1. Valve body; 2. Fixed sleeve; 3. Second-stage sleeve; 4. Actuator; 5. Upper valve stem; 6. Air film sleeve; 7. Bellows; 8. Valve core block; 9. Pressure cone cap; 10. Inner cooperating rod; 11. Lower valve stem; 12. Upper pressure plate; 13. Limit block; 14. Connecting spring; 15. Vent pipe. DETAILED DESCRIPTION

[0025] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] Example 1: The essence of a conventional pressure regulating valve is to adjust the discharge pressure of the medium by changing the opening of the internal valve core block structure. It can be applied to a variety of media. However, for high-temperature gases, such as high-temperature steam, the actual pressure of the high-temperature gas is significantly higher than the high-temperature gas pressure itself because of the influence of the high-temperature environment. This process directly affects the pressure regulation process and also increases the workload of the sealing structure in the valve stem. In this regard, the following technical solution is proposed:

[0027] Reference Figures 1 to 6 In this embodiment, a self-operated regulating valve for high-temperature gas includes a valve body 1, a valve core block 8, and an actuator 4. The actuator 4 is equipped with an upper valve stem 5 arranged downward. The valve core block 8 is located inside the valve body 1 and has a lower valve stem 11 installed at the center of its upper end. An actuating assembly is provided between the upper valve stem 5 and the lower valve stem 11.

[0028] The action component includes a bellows air pressure tube 7, an air film sleeve 6, and a limiting block 13. The upper end of the valve body 1 is respectively installed with a fixed sleeve 2 and a second-order sleeve 3 corresponding to the bellows air pressure tube 7 and the air film sleeve 6 from bottom to top. The lower valve stem 11 passes through the valve body 1 and the fixed sleeve 2 upward, and the upper end of the lower valve stem 11 is connected to the limiting block 13. The lower valve stem 11 is slidably installed with a vertically arranged inner cooperative rod 10. The upper end of the inner cooperative rod 10 is connected to the lower end of the bellows air pressure tube 7. A pressure cone cap 9 is installed on the lower end of the inner cooperative rod 10. The upper end of the bellows air pressure tube 7 is fixedly connected to the internal upper end of the fixed sleeve 2, and the lower end of the bellows air pressure tube 7 is slidably connected to the inner wall of the fixed sleeve 2.

[0029] Working principle: For the structure of conventional pressure regulating valve, Figure 2 For example, the actuator 4 drives the valve core block 8 to move in the vertical direction. The movement stroke of the valve core block 8 is used to change the opening inside the valve body 1, which is used to change the flow mode of the medium. This part is the operating principle of the conventional pressure regulating valve and is not explained in detail in the present invention.

[0030] However, the present invention adds an action component to the conventional valve stem structure. Specifically, the upper valve stem 5 and the lower valve stem 11 cooperate with the second-stage sleeve 3 and the fixed sleeve 2 to form a valve stem structure. Specifically, the actuator 4 is used as the power source of the entire structure, and includes the following actions:

[0031] Closing channel action: the upper end of the upper valve stem 5 maintains sliding with the second-order sleeve 3, so that when the upper valve stem 5 moves downward, it first squeezes the air film sleeve 6, and the air film sleeve 6 is in a compressed state and reaches a state that is difficult to be compressed further. In this process, because the lower end of the upper valve stem 5 and the fixed sleeve 2 are fixedly connected, the upper valve stem 5 also drives the fixed sleeve 2 to move downward, and the lower valve stem 11 and the fixed sleeve 2 are fixedly connected, so that the fixed sleeve 2 directly drives the lower valve stem 11 and the valve core block 8 to move downward, directly blocking the medium flow channel inside the valve body 1;

[0032] Open channel action: Based on the channel closing action, when the actuator 4 drives the upper valve stem 5 to move upward, the air film sleeve 6 therein can be understood as being in a pulled state, so that the lower valve stem 11 is not subjected to the pressure from the upper valve stem 5, and the valve core block 8 is subjected to the medium pressure and tends to move upward, so that the medium channel inside the valve body 1 is opened.

[0033] Example 2: Supplementary explanation of the sliding process of the inner cooperating rod in Example 1:

[0034] An oblique wedge block corresponding to the limit block 13 is installed at the lower end position of the fixed sleeve 2. The cross-section of the limit block 13 is truncated cone-shaped. A connecting spring 14 is installed at the lower end position of the limit block 13. The lower end position of the connecting spring 14 is installed in the inner wall position of the fixed sleeve 2. An upper pressure plate 12 is slidably installed at the middle position of the fixed sleeve 2 corresponding to the corrugated air pressure tube 7 and the limit block 13. The upper pressure plate 12 is slidably connected to the inner cooperation rod 10.

[0035] Solution Description: Refer to Figure 3 and Figure 5 To illustrate, when the valve core block 8 is in the channel opening action or channel closing action in the first embodiment, the pressure cone cap 9 therein is subjected to the medium pressure from the valve body 1, thereby cooperating to drive the inner cooperating rod 10 to move upward. More specifically, when in the channel closing action, the pressure cone cap 9 is subjected to greater pressure because the medium is difficult to discharge; when in the channel opening action, a portion of the medium continues to flow through the medium channel in the valve body 1, thereby reducing the pressure on the pressure cone cap 9.

[0036] In conjunction with the above, it should be noted that because the pressure regulating valve proposed in the present invention is primarily intended for use with high-temperature gas as a medium, according to the ideal gas equation, in a relatively closed space, the gas pressure increases as the gas temperature rises. When the valve body 1 is in the closed channel action, a completely closed space is formed inside, causing the internal pressure to continue to rise. In this state, the inner cooperating rod 10 moves upward at a greater amplitude.

[0037] When in the open channel action, part of the medium has already flowed out through the medium channel, but similarly, due to the change in medium temperature, part of the medium pressure will act on the pressure cone cap 9, which will also cause the inner cooperative rod 10 to show an upward movement trend. The only difference is that the upward movement amplitude of the inner cooperative rod 10 in the open channel action is relatively low.

[0038] Example 3: The present invention uses the upper valve stem and the lower valve stem as the valve stem structure in a conventional pressure regulating valve. This example provides a supplementary explanation of the movement process of the upper valve stem and the lower valve stem:

[0039] The air film sleeve 6 is arranged in the internal position of the second-order sleeve 3, and the air film sleeve 6 is located in the middle position of the upper valve stem 5, the upper end position of the upper valve stem 5 and the second-order sleeve 3 are fixedly connected, and the lower end position of the upper valve stem 5 and the upper end position of the fixed sleeve 2 are slidingly connected, and the lower valve stem 11 and the lower end position of the fixed sleeve 2 are slidingly connected. The interior of the lower end part of the upper valve stem 5 is hollow, and the interior of the air film sleeve 6 is connected to the interior of the corrugated air pressure tube 7 through the upper valve stem 5. The internal space of the fixed sleeve 2 corresponding to the corrugated air pressure tube 7 and the upper pressure plate 12 is set as a back-pressure chamber, and a vent pipe 15 is installed on the external position of the second-order sleeve 3 and the fixed sleeve 2. The interior of the air film sleeve 6 is connected to the interior of the back-pressure chamber through the vent pipe 15.

[0040] Solution description: Combined with Example 1 and Example 2, in order to ensure that the interior of the valve body 1 is in the action of closing the channel, it is necessary to ensure that the upper valve stem 5 of the upper part completely squeezes the air film sleeve 6, so that the force can be directly transmitted to the fixed sleeve 2. Because the upper end of the corrugated air pressure tube 7 is directly fixed in the internal position of the fixed sleeve 2, it should be noted that the gas squeezed out of the air film sleeve 6 is directly injected into the back pressure chamber through the vent pipe 15. In this process, the gas squeezed into the back pressure chamber will provide downward pressure on the upper pressure plate 12, ensuring that the limit block 13 drives the valve core block 8 to show a downward movement trend. Relevant instructions are required for this:

[0041] S1: Because the lower valve stem 11 needs to ensure that the valve core block 8 can move, and the movement direction is limited to the downward direction, an inclined wedge block corresponding to the limit block 13 is provided inside the fixed sleeve 2. The purpose is to ensure that the limit block 13 can move slightly downward relative to the inclined wedge block, but will not have an upward movement trend. The upper pressure plate 12 will not interfere with the movement process of the inner cooperating rod 10. Only when the upper pressure plate 12 is under pressure, the pressure is transferred to the limit block 13.

[0042] S2: The following is explained in conjunction with the inner cooperating rod 10: whether in the channel closing action or the channel opening action, the inner cooperating rod 10 moves upward under the action of the medium pressure, referring to Figure 6 To illustrate, the bellows air pressure tube 7 is supported by the inner cooperative rod 10, so that the internal volume of the bellows air pressure tube 7 is reduced. However, because the lower end portion of the upper valve stem 5 is hollow, the bellows air pressure tube 7 squeezes the internal gas into the air film sleeve 6 when compressed. This is supplemented by the opening channel action or the closing channel action:

[0043] S2-1: When the channel is opened, the squeezing force of the upper valve stem 5 on the air film sleeve 6 is reduced, and after the air film sleeve 6 is replenished with gas from the corrugated air pressure tube 7, it will indirectly squeeze the internal gas of the two back into the back pressure chamber, thereby continuing to provide downward pressure on the valve core block 8. Its essence is to maintain the opening of the valve core block 8 relative to the valve body 1, and prevent the valve core block 8 from being further opened due to "extra pressure";

[0044] S2-2: When the channel is closed, because the air film sleeve 6 is in a completely squeezed state, even if the air film sleeve 6 is replenished with gas from the inside of the corrugated air pressure tube 7, it will directly flow back to the back pressure chamber to increase the contact strength between the valve core block 8 and the inside of the valve body 1, and avoid the problem of internal leakage caused by separation between the valve core block 8 and the inside of the valve body 1 due to large fluctuations in the medium pressure.

[0045] Combined with the above-mentioned S1 and S2, it can be understood that: no matter whether the medium channel inside the valve body 1 is in an open or closed state, the secondary sliding process caused by the change of medium pressure on the inner cooperative rod 10 is specifically utilized to make the inner cooperative rod 10 generate upward pressure, and through the gas replenishment process generated by the volume change, the gas inside the air film sleeve 6 and the corrugated air pressure tube 7 is re-replenished into the back pressure chamber, so that the overall limiting block 13 and the valve core block 8 are subjected to pressure in the opposite direction to the medium pressure, which is used to maintain the opening of the valve core block 8 relative to the valve body 1.

[0046] In summary: Based on the conventional pressure regulating valve, because the high-temperature gas is affected by its own temperature environment, its pressure fluctuates. In this regard, the conventional regulating valve structure is improved, which is manifested in adding an action component for the valve core block. The action component is based on a corrugated air pressure tube and an internal cooperative rod. When the valve core block maintains vertical movement, the internal cooperative block performs a secondary movement with the change of the internal pressure of the valve body, and during the pressure conversion process of the corrugated air pressure tube and the air film sleeve, the upper pressure plate provides downward pressure to the limit block. Its purpose is: on the basis of not affecting the medium pressure, the adaptive movement of the valve core block is achieved through the secondary sliding process, and on the basis of maintaining the process requirements of the internal opening of the valve body, the free opening can also be adjusted.

[0047] The above contents are merely examples and explanations of the structure of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they shall fall within the scope of protection of the present invention.

[0048] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0049] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A self-operated regulating valve for high-temperature gas, comprising a valve body, a valve core block and an actuator, characterized in that: The actuator is equipped with an upper valve stem arranged downward, the valve core block is located inside the valve body and a lower valve stem is installed at the center point of the upper end, and an action component is arranged between the upper valve stem and the lower valve stem; The action assembly includes a bellows air pressure tube, an air film sleeve, and a direction limiting block. The upper end of the valve body is respectively installed with a fixed sleeve and a second-order sleeve corresponding to the bellows air pressure tube and the air film sleeve from bottom to top. The lower valve stem passes through the valve body and the fixed sleeve upward, and the upper end of the lower valve stem is connected to the direction limiting block. A vertically arranged inner cooperating rod is slidably installed inside the lower valve stem, and the upper end of the inner cooperating rod is connected to the lower end of the bellows air pressure tube. A pressure cone cap is installed at the lower end of the inner cooperating rod, the upper end of the corrugated air pressure tube is fixedly connected to the upper end of the interior of the fixed sleeve, and the lower end of the corrugated air pressure tube is slidably connected to the inner wall of the fixed sleeve, and an inclined wedge block corresponding to the limit block is installed at the lower end of the interior of the fixed sleeve, and the cross section of the limit block is truncated cone-shaped; An upper pressure plate is slidably installed inside the fixed sleeve at the middle position corresponding to the corrugated air pressure tube and the limiting block, the upper pressure plate and the inner cooperative rod are slidably connected, the air film sleeve is arranged in the internal position of the second-order sleeve, and the air film sleeve is located at the middle position of the upper valve stem, the upper end position of the upper valve stem and the second-order sleeve are fixedly connected, and the lower end position of the upper valve stem and the upper end position of the fixed sleeve are slidably connected, the lower valve stem and the lower end position of the fixed sleeve are slidably connected, the internal space of the fixed sleeve corresponding to the corrugated air pressure tube and the upper pressure plate is set as a back-pressure chamber, and a ventilation pipe is installed on the external position of the second-order sleeve and the fixed sleeve, and the interior of the air film sleeve is connected with the interior of the back-pressure chamber through the ventilation pipe.

2. A self-operated regulating valve for high temperature gas according to claim 1, characterized in that: A connecting spring is installed at the lower end of the limiting block, and the lower end of the connecting spring is installed in the inner wall of the fixing sleeve.

3. A self-operated regulating valve for high temperature gas according to claim 1, characterized in that: The interior of the lower end portion of the upper valve stem is hollow, and the interior of the air film sleeve is communicated with the interior of the corrugated air pressure tube through the upper valve stem.

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