A seal structure for a flue gas damper valve

Abstract

This utility model discloses a sealing structure for a flue gas gate valve, including a self-sealing sealing strip disposed at the valve port of the valve body for sealing the valve plate. The self-sealing sealing strip is disposed on the valve body via a packing gland, and a packing gland for pressing the self-sealing sealing strip is disposed between the self-sealing sealing strip and the packing pressure rod. The side of the self-sealing sealing strip facing the valve plate is a planar structure, and the side of the self-sealing sealing strip away from the valve plate has several slots for deformation when the self-sealing sealing strip is compressed. The flue gas gate valve sealing structure provided by this utility model has a self-sealing sealing strip with slots on its back disposed at the valve port of the valve body. When compressed by the valve plate, it can change the intensity of compression towards the slots according to the compression force of the valve plate, automatically compensating for the widening of the packing gland caused by the change in valve plate thickness, so that the valve plate and the self-sealing sealing strip fit tightly together, thereby improving the sealing performance of the flue gas gate valve.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, and more specifically to a sealing structure for a flue gas gate valve. Background Technology

[0002] The structure of the flue gas gate valve is as follows: Figures 1 to 2 As shown, the valve consists of a valve body 3, a valve plate 2, a drive device 1, packing, and a packing gland 4. The drive device 1 moves the valve plate 2 up and down to open and close the valve. The packing gland presses the packing to seal the valve plate and prevent flue gas leakage.

[0003] The valve plate is welded together from two layers of panels on the left and right sides, with a reinforcing rib in the middle. Due to unevenness in the rib during welding, and the continuous weld between the upper and lower baffles and the panels, the valve plate becomes uneven after welding. The top and lower surfaces of the rib fit well together, but the middle surface does not, resulting in a difference in thickness between the upper and lower sides and the middle of the valve plate. The flatness of the valve plate is 3-4 mm. The sealing structure of a traditional flue gas gate valve is as follows... Figure 3 As shown, a graphite packing 5 is installed on the valve body through a packing gland to seal the valve plate. When the valve plate is not flat, the middle of the valve plate is thick when the valve plate moves up and down. When the middle of the valve plate reaches the stuffing box, it squeezes the graphite packing and narrows the graphite packing. When the valve plate moves to the top or bottom, the valve plate and the graphite packing do not fit together due to the narrowing of the packing, resulting in flue gas leakage. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a flue gas gate valve sealing structure to solve the problems in the background art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows.

[0006] A flue gas gate valve sealing structure includes a self-sealing sealing strip disposed at the valve port of the valve body for sealing the valve plate. The self-sealing sealing strip is disposed on the valve body through a packing gland. A packing gland for pressing the self-sealing sealing strip is disposed between the self-sealing sealing strip and the packing pressure rod. The side of the self-sealing sealing strip facing the valve plate is a planar structure, and the side of the self-sealing sealing strip away from the valve plate has a plurality of slots for deformation when the self-sealing sealing strip is compressed.

[0007] To further optimize the technical solution, a baffle is provided on the valve body inside the slot to limit the deformation width of the self-sealing sealing strip.

[0008] To further optimize the technical solution, the self-sealing sealing strip is a soft silicone sealing strip.

[0009] To further optimize the technical solution, the width of the self-sealing sealing strip is 5mm larger than the width of the stuffing box.

[0010] To further optimize the technical solution, the width of the slot is consistent with the width of the self-sealing strip between adjacent slots.

[0011] The technological advancements achieved by this utility model are as follows, due to the adoption of the above technical solutions.

[0012] This utility model provides a sealing structure for a flue gas gate valve. A self-sealing sealing strip with a groove on the back is provided at the valve port of the valve body. When squeezed by the valve plate, it can change the squeezing intensity towards the groove according to the squeezing force of the valve plate, automatically compensating for the widening of the stuffing gland caused by the change in valve plate thickness, so that the valve plate and the self-sealing sealing strip fit tightly together, thereby improving the sealing performance of the flue gas gate valve. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a flue gas gate valve; Figure 2 This is a side view of a flue gas gate valve. Figure 3 This is a schematic diagram of the sealing structure of a traditional flue gas gate valve. Figure 4 This is a schematic diagram of the sealing structure of the flue gas gate valve of this utility model; Figure 5 This is a schematic diagram of the structure of the self-sealing sealing strip of this utility model.

[0014] The components are: 1. drive unit, 2. valve plate, 3. valve body, 4. packing gland, 5. graphite packing, 6. self-sealing sealing strip, 7. stuffing box, 8. baffle, and 9. slot. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] A flue gas gate valve sealing structure, combined with Figures 4 to 5 As shown, it includes a self-sealing sealing strip 6 installed at the valve port of the valve body 3 to achieve the sealing of the valve plate 2. The self-sealing sealing strip 6 is installed on the valve body 3 through the packing gland 4. A packing gland 7 is provided between the self-sealing sealing strip 6 and the packing gland 4 to compress the self-sealing sealing ring.

[0017] The self-sealing sealing strip 6 has a planar structure on the side facing the valve plate 2, and several slots 9 are opened on the side of the self-sealing sealing strip 6 away from the valve plate 3. These slots are used to deform the self-sealing sealing strip when it is squeezed, thereby achieving a seal between the self-sealing sealing strip and the valve plate.

[0018] A baffle 8 is provided on the valve body 3 inside the slot 9 to limit the deformation width of the self-sealing sealing strip 6, and at the same time to reset the squeezed self-sealing sealing strip.

[0019] The self-sealing sealing strip 6 is a soft silicone sealing strip. The width of the self-sealing sealing strip 6 is 5mm larger than the width of the stuffing box 7. The width of the groove 9 is consistent with the width of the self-sealing sealing strip between adjacent grooves. This ensures that the self-sealing sealing strip deforms when squeezed and rebounds when the squeeze is released.

[0020] This invention relates to a system where, after the self-sealing sealing strip is pressed into the stuffing box, the self-sealing sealing strip can change the intensity of its compression towards the groove according to the pressure exerted by the valve plate when it is squeezed by the valve plate. This automatically compensates for the widening of the stuffing box caused by changes in the valve plate thickness, ensuring a tight fit between the valve plate and the self-sealing sealing strip, thereby improving the sealing performance of the flue gas gate valve.

Claims

1. A sealing structure for a flue gas gate valve, characterized in that: The valve body (3) includes a self-sealing sealing strip (6) installed at the valve port to achieve sealing of the valve plate (2). The self-sealing sealing strip (6) is installed on the valve body (3) through a packing gland (4). A packing gland (7) for pressing the self-sealing sealing strip is provided between the self-sealing sealing strip (6) and the packing gland (4). The side of the self-sealing sealing strip (6) facing the valve plate (2) is a planar structure, and the side of the self-sealing sealing strip (6) away from the valve plate (2) has several slots (9) for deformation when the self-sealing sealing strip is squeezed.

2. The flue gas gate valve sealing structure according to claim 1, characterized in that: A baffle (8) is provided on the valve body (3) inside the slot (9) to limit the deformation width of the self-sealing sealing strip (6).

3. The flue gas gate valve sealing structure according to claim 1, characterized in that: The self-sealing sealing strip (6) is a soft silicone sealing strip.

4. The flue gas gate valve sealing structure according to claim 3, characterized in that: The width of the self-sealing sealing strip (6) is 5 mm larger than the width of the stuffing box (7).

5. The sealing structure of a flue gas gate valve according to claim 1, characterized in that: The width of the slot (9) is consistent with the width of the self-sealing strip between adjacent slots.

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