Anti-leakage type gas heat exchanger flue gas inlet stop valve

Abstract

The utility model relates to the technical field of stop valves, in particular to an anti-leakage type gas heat exchanger flue gas inlet stop valve which comprises a three-way pipe, a stop valve body is arranged at the top of the three-way pipe, anti-leakage rings are fixedly connected to the side walls of the two ends of the three-way pipe, flue gas conveying pipes are arranged at the two ends of the three-way pipe, and the anti-leakage rings extend into the flue gas conveying pipes. Wherein one flue gas conveying pipe is fixedly connected to the air inlet end of the heat exchanger, flange plates are fixedly connected to the outer walls of the ends, close to each other, of the two flue gas conveying pipes and the three-way pipe, and a plurality of fixing holes which are evenly distributed at equal intervals are formed in the side walls of the flange plates; the opposite ends of the two three-way pipes and the two flue gas conveying pipes are respectively provided with an anti-leakage mechanism for preventing gas leakage. Compared with the prior art, the problems that a traditional sealing structure is single and multi-stage leakage prevention cannot be achieved are solved through the leakage prevention mechanism, and the strict requirements of a modern gas system for high airtightness and high safety are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to cut -off valve technical field especially relates to a kind of leakage-proof type coal gas heat exchanger flue gas import cut -off valve. BACKGROUND

[0002] Coal gas heat exchanger is a kind of equipment using high-temperature coal gas to other medium heat transfer, commonly used in steel, chemical industry and other industrial fields waste heat recovery and energy utilization optimization, leakage-proof type coal gas heat exchanger flue gas import cut -off valve is a kind of safety device specially used for controlling and isolating coal gas heat exchanger flue gas inlet passage, with the characteristics of quick cut-off and tight seal, the valve can quickly close flue gas passage when heat exchanger operates abnormally or stops maintenance, prevent high-temperature harmful flue gas from leaking to external environment, effectively guarantee the safety of operating personnel and the reliability of equipment operation.

[0003] Chinese patent discloses: a kind of leakage-proof type double protection valve lock, patent announcement number: CN222416310U, the patent "by the rotation of knob and switch connection, realize double protection effect, when needing to open valve, first need to place magnet in the inside of recess, at this time trigger rod is attracted by the magnetic force of magnet, so that trigger rod is displaced along the inside of card slot until carding in the inside of linkage hole, at this time trigger rod is located in the inside of card slot and linkage hole, at this time rotate knob can control the closure of switch".

[0004] Although the valve can improve sealing effect by first sealing ring and second sealing ring, achieve the effect of preventing leakage, but when the valve lock is used in coal gas heat exchanger inlet pipe, only two sealing rings are sealed and connected with flue gas inlet pipe, although it can achieve basic sealing effect in a short time, but due to the single sealing structure, it is difficult to achieve multi-stage leakage prevention, once the sealing ring fails due to high temperature aging, corrosion or mechanical wear, it is easy to cause flue gas leakage, not only reduces the sealing reliability of equipment, but also increases the risk of fire, poisoning and other safety accidents, it is difficult to meet the current use demand of high air tightness and high safety coal gas system, therefore, it is urgent to provide a cut-off valve with multi-stage leakage prevention capability, which can realize efficient sealing at multiple points, effectively improve operation stability and use safety. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model aims at providing a kind of leakage-proof type coal gas heat exchanger flue gas import cut -off valve to solve the problem that existing cut -off valve is sealed and connected with flue gas inlet pipe by two sealing rings, but due to the single sealing structure, it is difficult to achieve multi-stage leakage prevention, and it is difficult to meet the current use demand of high air tightness and high safety coal gas system.

[0006] To achieve the above objectives, this utility model provides a leak-proof flue gas inlet shut-off valve for a gas heat exchanger, comprising a three-way pipe, a shut-off valve body at the top of the three-way pipe, leak-proof rings fixedly connected to the side walls at both ends of the three-way pipe, flue gas delivery pipes at both ends of the three-way pipe, the leak-proof rings extending into the flue gas delivery pipes, one of the flue gas delivery pipes being fixedly connected to the gas inlet end of the heat exchanger, flanges fixedly connected to the outer walls of the two flue gas delivery pipes and the three-way pipe at their adjacent ends, the side walls of the flanges having multiple evenly distributed fixing holes, and leak-proof mechanisms for preventing gas leakage being provided at the opposite ends of the two three-way pipes and the two flue gas delivery pipes.

[0007] Preferably, the leak-proof mechanism includes a sealing ring fixedly connected to the outer wall of the leak-proof ring. The number of sealing rings is three, and the three sealing rings are arranged vertically. A plurality of equally spaced and evenly distributed sealing strips are fixedly connected between the outer walls of the three sealing rings. The plurality of equally spaced and evenly distributed sealing strips are arranged horizontally. The three sealing rings and the plurality of equally spaced and evenly distributed sealing strips are arranged in a mesh shape. The outer walls of the sealing rings and sealing strips are tightly fitted to the inner wall of the flue gas conveying pipe.

[0008] Preferably, a first corrugated strip is fixedly connected to the sidewalls of both ends of the two flue gas conveying pipes near the tee pipe. A sliding groove is opened on the sidewalls of both ends of the tee pipe near the first corrugated strip. A spring is fixedly connected inside the sliding groove. A second corrugated strip is fixedly connected to one end of the spring. The second corrugated strip is slidably connected in the sliding groove. The sidewalls of the first corrugated strip and the sidewalls of the second corrugated strip are adapted to each other.

[0009] Preferably, expansion bags are fitted on the outer walls of both ends of the three-way pipe and the opposite ends of the two flue gas conveying pipes, and binding straps are fitted on both sides of the two expansion bags, with the two binding straps respectively installed on the two ends of the three-way pipe and the outer walls of the flue gas conveying pipes.

[0010] Preferably, a fixing cover is fixedly connected to the outer wall of both ends of the three-way pipe, a pressure sensor is fixedly connected to the top of the inner wall of the fixing cover, and an alarm light is fixedly connected to the top of the outer wall of the fixing cover.

[0011] Preferably, when the expansion bag expands, the top of the expansion bag and the bottom of the pressure sensor come into contact with each other.

[0012] The beneficial effects of this utility model are:

[0013] 1. This leak-proof gas heat exchanger flue gas inlet shut-off valve features a leak-proof mechanism that incorporates three sealing rings and multiple horizontally equidistant sealing strips within the connection area between the tee pipe and the flue gas delivery pipe. The sealing strips and rings are arranged in a crisscross pattern, significantly increasing the contact area between the sealing components and the pipe wall. This achieves multi-directional compression sealing, effectively preventing flue gas leakage. Simultaneously, a first corrugated strip at the end of the flue gas delivery pipe axially compresses an internal second corrugated strip. The second corrugated strip pushes a spring to generate a reverse elastic force, causing the first corrugated strip to embed into a groove, achieving dynamic sealing of the wavy contact surface. This multi-stage collaborative structure maintains stable fit even under high-temperature expansion or mechanical vibration environments, significantly improving sealing reliability and operational safety. It overcomes the problem of traditional single-stage sealing structures lacking multi-stage leak prevention, meeting the stringent requirements of modern gas systems for high airtightness and high safety.

[0014] 2. This leak-proof flue gas inlet shut-off valve for the gas heat exchanger utilizes an expansion bag around the tee pipe and flue gas delivery pipe, forming a multi-stage leak-proof structure with early warning capabilities. When a small amount of flue gas leaks due to seal failure, the leaking gas first enters the expansion bag. As the gas accumulates, the expansion bag expands and applies pressure to the pressure sensor, causing it to quickly detect the pressure change and transmit a signal to the alarm light. The alarm light immediately activates, alerting relevant personnel to perform maintenance. This structure enables automatic detection and alarm in the early stages of leakage, effectively preventing the fault from spreading, improving the sealing monitoring capability and safety response efficiency of the gas heat exchanger system, and significantly enhancing the operational safety and multi-stage protection capabilities of the device. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0017] Figure 2 This is a three-dimensional structural diagram of the leak-proof mechanism of this utility model;

[0018] Figure 3 This is a schematic diagram of the internal structure of the fixing cover of this utility model;

[0019] Figure 4 This is a schematic diagram of the expansion bag and pressure sensor structure of this utility model;

[0020] Figure 5 This utility model Figure 4Enlarged structural diagram at point A in the middle.

[0021] The diagram is marked as follows:

[0022] 1. Tee pipe; 2. Shut-off valve body; 3. Fixing hole; 4. Leakage prevention ring; 5. Flue gas conveying pipe; 6. Flange; 7. Sealing ring; 8. Sealing strip; 9. First corrugated strip; 10. Slide groove; 11. Spring; 12. Second corrugated strip; 13. Expansion bag; 14. Strap; 15. Fixing cover; 16. Pressure sensor; 17. Alarm light. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0024] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] like Figures 1 to 5 As shown, a leak-proof flue gas inlet shut-off valve for a gas heat exchanger includes a three-way pipe 1, a shut-off valve body 2 at the top of the three-way pipe 1, leak-proof rings 4 fixedly connected to the side walls at both ends of the three-way pipe 1, and flue gas delivery pipes 5 at both ends of the three-way pipe 1. The leak-proof rings 4 extend into the flue gas delivery pipes 5. One of the flue gas delivery pipes 5 is fixedly connected to the gas inlet end of the heat exchanger. Flanges 6 are fixedly connected to the outer walls of the two flue gas delivery pipes 5 and the three-way pipe 1 at their respective close ends. Multiple evenly distributed fixing holes 3 are opened on the side walls of the flanges 6. Leak-proof mechanisms for preventing gas leakage are respectively provided at the opposite ends of the two three-way pipes 1 and the two flue gas delivery pipes 5.

[0026] Further, see attached document. Figures 2 to 3As shown, the leak prevention mechanism includes a sealing ring 7 fixedly connected to the outer wall of the leak prevention ring 4. There are three sealing rings 7, which are arranged vertically. Multiple equally spaced and evenly distributed sealing strips 8 are fixedly connected between the outer walls of the three sealing rings 7. The multiple equally spaced and evenly distributed sealing strips 8 are arranged horizontally. The three sealing rings 7 and the multiple equally spaced and evenly distributed sealing strips 8 are arranged in a mesh shape. The outer walls of the sealing rings 7 and sealing strips 8 are tightly fitted to the inner wall of the flue gas conveying pipe 5. The two flue gas conveying pipes 5 are fixedly connected to the side walls of both ends near the three-way pipe 1. The two ends of the three-way pipe 1 are provided with sliding grooves 10 near the side walls of the first corrugated strips 9. A spring 11 is fixedly connected inside the sliding groove 10. A second corrugated strip 12 is fixedly connected to one end of the spring 11. The second corrugated strip 12 is slidably connected in the sliding groove 10. The side walls of the first corrugated strip 9 and the side walls of the second corrugated strip 12 are adapted to each other.

[0027] When using the leak prevention mechanism, firstly, the three-way pipe 1 and one end of the flue gas conveying pipe 5 are tightly connected through the flange 6. Then, three sealing rings 7 and multiple horizontally equidistant sealing strips 8 are set between the inner walls of the connection area between the three-way pipe 1 and the flue gas conveying pipe 5. The sealing strips 8 and sealing rings 7 are arranged in a cross pattern and are tightly fitted to the inner wall of the flue gas conveying pipe 5. This cross pattern significantly increases the contact area between the sealing components and the inner wall, and at the same time forms a multi-directional pressing effect, which enhances the overall sealing performance and effectively prevents the leakage of flue gas in multiple directions. It is worth mentioning that this structure can still maintain a stable fit when exposed to high temperature expansion or mechanical vibration, further improving the sealing reliability between the flue gas conveying pipe 5 and the three-way pipe 1.

[0028] In addition, a first corrugated strip 9 is provided at one end of the flue gas conveying pipe 5. During use, it can move axially and squeeze the second corrugated strip 12 located inside it. When the second corrugated strip 12 is compressed, it pushes the spring 11 inside it to generate a reverse elastic force, so that the first corrugated strip 9 can be smoothly embedded in the groove 10 provided in the inner wall of the conveying pipe. Through the guiding effect of the groove 10 structure and the staggered cooperation of the wave-shaped contact surfaces provided on the opposite surfaces of the first corrugated strip 9 and the second corrugated strip 12, dynamic sealing and effective prevention of flue gas leakage are achieved. The overall structure is multi-stage coordinated, which not only improves the sealing ability, but also adapts to the changes of complex working conditions during operation, and has excellent anti-leakage effect and operational safety.

[0029] In the leak-proof mechanism, three sealing rings 7 and multiple horizontally equidistant sealing strips 8 are set in the connection area between the tee pipe 1 and the flue gas conveying pipe 5. The sealing strips 8 and sealing rings 7 are arranged in a cross pattern, which significantly increases the contact area between the sealing components and the pipe wall, achieving multi-directional compression sealing and effectively preventing flue gas leakage. At the same time, the end of the flue gas conveying pipe 5 is provided with a first corrugated strip 9, which can axially compress the inner second corrugated strip 12. The second corrugated strip 12 pushes the spring 11 to generate a reverse elastic force, so that the first corrugated strip 9 is embedded in the sliding groove 10, realizing the dynamic sealing fit of the wave-shaped contact surface. This multi-stage cooperative structure can still maintain stable fit under high temperature expansion or mechanical vibration environment, greatly improving sealing reliability and operational safety. It overcomes the problem of traditional sealing structures being single and unable to prevent leakage in multiple stages, meeting the stringent requirements of modern gas systems for high airtightness and high safety.

[0030] Further, see attached document. Figure 4 and Figure 5 As shown, expansion bags 13 are fitted on the outer walls of the three-way pipe 1 and the two flue gas conveying pipes 5 at opposite ends. Two straps 14 are fitted on both sides of the two expansion bags 13. The two straps 14 are respectively installed on the two ends of the three-way pipe 1 and the outer wall of the flue gas conveying pipe 5. A fixing cover 15 is fixedly connected to the outer wall of one end of the three-way pipe 1. A pressure sensor 16 is fixedly connected to the top of the inner wall of the fixing cover 15. When the expansion bag 13 expands, the top of the expansion bag 13 and the bottom of the pressure sensor 16 come into contact with each other. An alarm light 17 is fixedly connected to the top of the outer wall of the fixing cover 15. The pressure sensor 16 and the alarm light 17 are electrically connected.

[0031] By setting expansion bags 13 at both ends of the three-way pipe 1 and around the flue gas conveying pipe 5, the real-time monitoring and alarm function of flue gas leakage is further realized, and a multi-level anti-leakage structure is constructed. When a small amount of flue gas leaks from between the three-way pipe 1 and the flue gas conveying pipe 5 due to sealing failure, the leaked flue gas will preferentially enter the expansion bag 13 set at that position. As the flue gas continues to enter, the expansion bag 13 gradually expands. When it expands to a certain extent, it will generate a squeezing force to act on the adjacent pressure sensor 16.

[0032] After being squeezed by the expansion bag 13, the pressure sensor 16 quickly senses the pressure change and transmits the signal to the alarm light 17. Upon receiving the signal, the alarm light 17 immediately activates the alarm to remind the operator or maintenance personnel that there is a sealing abnormality in the equipment and that timely inspection and maintenance are required. Through this mechanism, even if there is a slight leak in the sealing structure, early warning can be achieved, effectively preventing the leak from expanding further, thereby ensuring the safe and stable operation of the gas heat exchanger system and significantly improving the safety management level and multi-level protection capabilities of the device.

[0033] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0034] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A leak-proof flue gas inlet shut-off valve for a gas heat exchanger, comprising a three-way pipe (1), wherein a shut-off valve body (2) is provided at the top of the three-way pipe (1), characterized in that: Leakage-proof rings (4) are fixedly connected to the side walls of both ends of the three-way pipe (1). Flue gas conveying pipes (5) are provided at both ends of the three-way pipe (1). The leakage-proof rings (4) extend into the flue gas conveying pipes (5). One of the flue gas conveying pipes (5) is fixedly connected to the air inlet end of the heat exchanger. Flanges (6) are fixedly connected to the outer walls of the two flue gas conveying pipes (5) and the three-way pipe (1) that are close to each other. Multiple fixing holes (3) are evenly distributed at equal intervals on the side wall of the flange (6). Leakage-proof mechanisms for preventing gas leakage are respectively provided at the opposite ends of the two three-way pipes (1) and the two flue gas conveying pipes (5).

2. The leak-proof flue gas inlet shut-off valve for a gas heat exchanger according to claim 1, characterized in that, The leak prevention mechanism includes a sealing ring (7) fixedly connected to the outer wall of the leak prevention ring (4). There are three sealing rings (7). The three sealing rings (7) are arranged vertically. Multiple equally spaced and evenly distributed sealing strips (8) are fixedly connected between the outer walls of the three sealing rings (7). The multiple equally spaced and evenly distributed sealing strips (8) are arranged horizontally. The three sealing rings (7) and the multiple equally spaced and evenly distributed sealing strips (8) are arranged in a mesh shape. The outer walls of the sealing rings (7) and sealing strips (8) are tightly fitted to the inner wall of the flue gas conveying pipe (5).

3. The leak-proof flue gas inlet shut-off valve for a gas heat exchanger according to claim 2, characterized in that, The two flue gas conveying pipes (5) are fixedly connected to the side walls of the two ends of the three-way pipe (1) with first corrugated strips (9). The two ends of the three-way pipe (1) are provided with sliding grooves (10) on the side walls of the first corrugated strips (9). A spring (11) is fixedly connected inside the sliding groove (10). A second corrugated strip (12) is fixedly connected to one end of the spring (11). The second corrugated strip (12) is slidably connected in the sliding groove (10). The side walls of the first corrugated strip (9) and the side walls of the second corrugated strip (12) are adapted to each other.

4. The leak-proof flue gas inlet shut-off valve for a gas heat exchanger according to claim 3, characterized in that, Expansion bags (13) are fitted on both ends of the three-way pipe (1) and on the outer walls of the opposite ends of the two flue gas conveying pipes (5). Straps (14) are fitted on both sides of the two expansion bags (13). The two straps (14) are respectively installed on both ends of the three-way pipe (1) and on the outer walls of the flue gas conveying pipes (5).

5. The leak-proof flue gas inlet shut-off valve for a gas heat exchanger according to claim 4, characterized in that, The outer walls of both ends of the three-way pipe (1) are fixedly connected to a fixed cover (15), the top of the inner wall of the fixed cover (15) is fixedly connected to a pressure sensor (16), and the top of the outer wall of the fixed cover (15) is fixedly connected to an alarm light (17).

6. The leak-proof flue gas inlet shut-off valve for a gas heat exchanger according to claim 4, characterized in that, When the expansion bag (13) expands, the top of the expansion bag (13) and the bottom of the pressure sensor (16) come into contact with each other.

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