Adjustable explosion door of boiler flue

Abstract

The utility model relates to the field of explosion-proof devices of boiler flues, in particular to an adjustable explosion-proof door of a boiler flue, which comprises a door cover hinged on the outer side wall of a flue pipe and used for preventing the pressure of a flue gas side from being increased too much instantly. The adjusting screw rod is hinged to the outer side wall of the flue pipe, the adjusting screw rod is located above the portion, away from the flue gas side, of the door cover, the adjusting screw rod is located at the center position of the door cover, a balancing weight capable of adjusting the position is arranged on the adjusting screw rod in a threaded fit mode, a pressing hole is formed in the adjusting screw rod, and a pressing screw rod capable of pressing the door cover is inserted into the pressing hole. And the pressing screw rod is positioned on the adjusting screw rod above the balancing weight. According to the utility model, the position of the counter weight is adjusted by screwing the counter weight block, so that the pressure bearing capacity of the door cover can be adjusted, and the requirements of different flue explosion-proof pressures can be met.

Description

Technical Field

[0001] The utility model relates to the field of explosion-proof devices for boiler flues, in particular to an adjustable explosion-proof door for boiler flues. Background Art

[0002] The normal operation of the flue gas side of the boiler in a thermal power plant is a negative pressure condition. When the boiler explodes or the steam-water pipeline leaks, the negative pressure condition on the flue gas side instantly turns into a positive pressure, causing the pressure on the flue gas side to increase by hundreds to thousands of times, resulting in the pressure on the flue gas side exceeding the pressure-bearing capacity of the flue, ultimately causing equipment damage. Therefore, in order to prevent equipment damage, a flue explosion-proof door is installed.

[0003] At present, the flue explosion-proof door generally uses its own fixed gravity to deal with the sudden increase in pressure. However, due to the different operating pressures in different parts of the flue and the different pressures generated by the deflagration, the same type of explosion-proof door cannot meet the needs. When it is necessary to use explosion-proof doors with different gravity, the entire explosion-proof door can only be replaced, which is troublesome to operate. Utility Model Content

[0004] The utility model is intended to provide an adjustable explosion-proof door for a boiler flue, so as to solve the problem that the existing explosion-proof door changes its own gravity under different explosion-proof pressure requirements, needs to be replaced as a whole, and the replacement operation is troublesome.

[0005] The adjustable explosion-proof door of the boiler flue in this scheme includes a door cover hinged on the outer side wall of the flue pipe to prevent the flue gas side pressure from increasing too much instantly;

[0006] It also includes an adjusting screw hinged on the outer wall of the flue pipe, the adjusting screw is located above the door cover away from the smoke side, the adjusting screw is located in the center of the door cover, the adjusting screw is threaded with a counterweight block capable of adjusting the position, a clamping hole is opened on the adjusting screw, a clamping screw capable of clamping the door cover is inserted into the clamping hole, and the clamping screw is on the adjusting screw located above the counterweight block.

[0007] The beneficial effects of this program are:

[0008] In actual use, by screwing the counterweight to adjust the position of the counterweight, the door cover can be adjusted to withstand the pressure of the counterweight on the adjusting screw to meet the needs of different smoke duct explosion-proof pressures. There is no need to replace the cover door as a whole, which makes the operation more convenient. At the same time, the setting of the compression screw can adjust the stability of the door cover. The upper hinge plays a fixing role in the installation of the entire explosion-proof door.

[0009] Furthermore, the length of the threaded section on the adjusting screw accounts for one third of the total length of the adjusting screw, and the diameter of the adjusting screw is 20-30 mm.

[0010] The beneficial effect is that the range of adjusting the position of the counterweight block can be limited by adjusting the length of the threaded section on the screw.

[0011] Furthermore, the clamping screw is located at a middle position of the adjusting screw, and a diameter of the clamping screw is smaller than a diameter of the adjusting screw.

[0012] The beneficial effect is that the position setting of the clamping screw can serve as a fulcrum for the counterweight block to adjust the counterweight pressure, so as to clamp the door cover, so as to adjust different explosion-proof pressure requirements.

[0013] Furthermore, the compression screw comprises a threaded rod body and a nut threadedly engaged with the threaded rod body, and the thread on the threaded rod body extends to the entire length.

[0014] The beneficial effect is that the setting of the pressing screw can adjust the distance between the counterweight block and the door cover, so as to adjust the counterweight pressure.

[0015] Furthermore, the longitudinal section of the clamping hole is hourglass-shaped, the diameter of the wide section of the clamping hole is 1-2 mm larger than the diameter of the narrow section in the middle, and the narrow section in the middle of the clamping hole is provided with an internal thread that cooperates with the clamping screw.

[0016] The beneficial effect is that the shape and size setting of the clamping hole can automatically shift according to the different inclination directions of the adjusting screw during the adjustment of the clamping screw to perform the adjustment operation of the counterweight block.

[0017] Furthermore, a support rod is fixedly provided in the radial direction of one end of the adjusting screw away from the counterweight block, and supports are hinged at both ends of the support rod, and the supports are fixed on the outer side wall of the flue pipe.

[0018] The beneficial effect is that the adjusting screw is installed through the support rod and the support, which can facilitate the installation of the adjusting screw and limit the displacement amplitude of the adjusting screw in the lateral direction.

[0019] Furthermore, the radial cross section of the door cover is wide-mouthed, and the diameter of the door cover is larger than the opening diameter of the flue pipe.

[0020] The beneficial effect is that the shape of the door cover can completely cover the through hole, so as to reduce as much as possible the airflow overflowing from the gap opened by the door cover when the pressure increases sharply.

[0021] Furthermore, a plurality of adjustment blocks capable of increasing the weight are threadedly engaged on the outer wall of the counterweight block, and the thickness of the adjustment blocks is one third of the thickness of the counterweight block.

[0022] The beneficial effect is that by setting an adjustment block with a smaller thickness on the counterweight block, the weight of the counterweight block can be quickly changed according to actual needs, and the center of gravity position of the counterweight block after the weight is increased can be quickly and accurately adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a longitudinal cross-sectional view of the first embodiment of the adjustable explosion-proof door of the boiler flue of the utility model;

[0024] Figure 2 for Figure 1 Right view of;

[0025] Figure 3 It is a longitudinal cross-sectional view of the compression hole in the first embodiment of the adjustable explosion-proof door of the boiler flue of the utility model;

[0026] Figure 4 It is the front view of the second embodiment of the adjustable explosion-proof door of the boiler flue of the utility model. DETAILED DESCRIPTION

[0027] The following is further explained in detail through specific implementation methods.

[0028] The reference numerals in the drawings of the specification include: door cover 1, adjusting screw 2, counterweight block 3, clamping screw 4, support 5, support rod 6, clamping hole 7, and adjusting block 8.

[0029] Embodiment 1

[0030] Adjustable explosion-proof door for boiler flue, such as Figure 1 and Figure 2 As shown: it includes a door cover 1 hinged on the outer wall of the flue pipe to prevent the pressure on the flue gas side from increasing too much instantly. The hinge method of the door cover 1 is existing, such as hinged by hinges and shafts, which will not be repeated here. The shape of the door cover 1 is set according to the opening on the flue pipe, such as a disc shape. The radial cross-section of the door cover 1 is wide-mouthed, and the diameter of the door cover 1 is larger than the opening diameter on the flue pipe, so that it can cover the opening to prevent too much airflow from overflowing due to a sudden increase in pressure.

[0031] It also includes an adjusting screw 2 hinged on the outer wall of the flue pipe, the adjusting screw 2 is located above the door cover 1 away from the smoke side, the adjusting screw 2 is located in the center of the door cover 1, and a support rod 6 is welded radially at one end of the adjusting screw 2 away from the counterweight 3, and supports 5 are hinged at both ends of the support rod 6. The support rod 6 and the support 5 can be hinged by a hinge or an empty sleeve, and the support 5 is welded to the outer wall of the flue pipe.

[0032] The adjusting screw 2 is threaded with a counterweight 3 capable of adjusting the position, and a pressing hole 7 is provided on the adjusting screw 2. A pressing screw 4 capable of pressing the door cover 1 is inserted into the pressing hole 7, and the pressing screw 4 is located on the adjusting screw 2 above the counterweight 3. The length of the thread section on the adjusting screw 2 accounts for one third of the total length of the adjusting screw 2, and the diameter of the adjusting screw 2 is 20-30 mm.

[0033] The clamping screw 4 is located in the middle of the adjusting screw 2, and the diameter of the clamping screw 4 is smaller than the diameter of the adjusting screw 2, and the diameter of the clamping screw 4 is greater than half of the diameter of the adjusting screw 2, that is, assuming that the diameter of the clamping screw 4 is L1, and the diameter of the adjusting screw 2 is L2, the value range of L1 is [0.5*L2, L2), so as to maintain sufficient strength of the clamping screw 4 during the force-bearing process. The clamping screw 4 includes a threaded rod body and a nut threadedly fitted on the threaded rod body, and the thread on the threaded rod body extends to the entire length.

[0034] like Figure 3 As shown, the longitudinal section of the clamping hole 7 is hourglass-shaped, the diameter of the wide section of the clamping hole 7 is 1-2 mm larger than the diameter of the narrow section in the middle, and the narrow section in the middle of the clamping hole 7 is provided with an internal thread that cooperates with the clamping screw 4.

[0035] The specific implementation process is as follows:

[0036] When preventing the problem of sudden pressure increase caused by deflagration on the flue side of the boiler, cover the air hole with the door cover 1, hinge the adjusting screw 2 at the position directly above the door cover 1, and let the adjusting screw 2 be located in the middle of the door cover 1. Adjust the position of the counterweight by screwing the counterweight 3, and adjust the stability of the door cover 1 by adjusting the clamping screw 4. This can adjust the pressure-bearing capacity of the door cover 1 to meet the needs of different flue explosion-proof pressures. There is no need to replace the cover door as a whole, which makes the operation more convenient. At the same time, after the support rod 6 is welded to the adjusting screw 2, the support 5 limits the left and right movement of the support rod 6 and the left and right swing angle of the adjusting screw 2, so that the door panel is stable and cannot move left and right. The setting of the clamping screw 4 can adjust the stability of the door cover 1. The upper hinge plays a fixing role in the installation of the entire explosion-proof door.

[0037] Embodiment 2

[0038] The adjustable explosion-proof door of the boiler flue is different from the first embodiment in that Figure 4 As shown, the outer wall of the counterweight block 3 is threaded with a number of adjustment blocks 8 that can increase the weight. The thickness of the adjustment block 8 is one-third of the thickness of the counterweight block 3. The number of the adjustment blocks 8 can be set to one, two or three according to actual needs. When the weight of the counterweight block 3 needs to be changed, a better and heavier counterweight block 3 can be directly used; or the adjustment block 8 can be screwed on the counterweight block 3. For example, in actual application, if the weight of the counterweight block 3 is not enough and the counterweight block 3 cannot be removed to replace the counterweight block 3 of other weight, the adjustment block 8 can be screwed on the counterweight block 3. The position and number of the adjustment blocks 8 can also be screwed according to the needs to adjust the center of gravity of the counterweight block 3 after the weight is increased to improve the explosion-proof effect.

[0039] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An adjustable explosion-proof door for a boiler flue, comprising a door cover hinged on the outer side wall of the flue pipe to prevent the flue gas side pressure from increasing too much instantly; characterized in that: It also includes an adjusting screw hinged on the outer wall of the flue pipe, the adjusting screw is located above the door cover away from the smoke side, the adjusting screw is located in the center of the door cover, the adjusting screw is threaded with a counterweight block capable of adjusting the position, a clamping hole is opened on the adjusting screw, a clamping screw capable of clamping the door cover is inserted into the clamping hole, and the clamping screw is on the adjusting screw located above the counterweight block.

2. The adjustable explosion-proof door for boiler flue according to claim 1 is characterized by: The length of the threaded section on the adjusting screw accounts for one third of the total length of the adjusting screw, and the diameter of the adjusting screw is 20-30 mm.

3. The adjustable explosion-proof door for boiler flue according to claim 2 is characterized by: The pressing screw is located at the middle position of the adjusting screw, and the diameter of the pressing screw is smaller than the diameter of the adjusting screw.

4. The adjustable explosion-proof door for boiler flue according to claim 1 is characterized by: The compression screw comprises a threaded rod body and a nut threadedly matched on the threaded rod body, and the thread on the threaded rod body extends to the entire length.

5. The adjustable explosion-proof door for boiler flue according to claim 1 is characterized by: The longitudinal section of the clamping hole is hourglass-shaped, the diameter of the wide section of the clamping hole is 1-2 mm larger than the diameter of the narrow section in the middle, and the narrow section in the middle of the clamping hole is provided with an internal thread that cooperates with the clamping screw.

6. The adjustable explosion-proof door for boiler flue according to claim 1, characterized in that: A support rod is fixedly provided in the radial direction of one end of the adjusting screw rod away from the counterweight block, and supports are respectively hinged at both ends of the support rod, and the supports are fixed on the outer side wall of the flue pipe.

7. The adjustable explosion-proof door for boiler flue according to claim 1 is characterized by: The radial cross section of the door cover is wide-mouthed, and the diameter of the door cover is larger than the opening diameter of the flue pipe.

8. The adjustable explosion-proof door of a boiler flue according to any one of claims 1 to 7, characterized in that: A plurality of adjustment blocks capable of increasing the weight are threadedly engaged on the outer wall of the counterweight block, and the thickness of the adjustment blocks is one third of the thickness of the counterweight block.

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