Baffle door shaft sealing structure

Abstract

The utility model discloses a baffle door shaft sealing structure. The baffle door shaft sealing structure comprises a sealing kit and a protective shell. The protective shell comprises a radial protective shell and a protective end cover; the protection end covers are located at the two ends of the sealing kit correspondingly and detachably connected with the radial protection shell. The sealing kit is arranged outside one end, extending out of the air duct, of the baffle door shaft in a sleeving manner, is positioned on the inner side of the radial protection shell, and comprises an inner sealing sleeve and an outer sealing sleeve which are sleeved inside and outside; the section of the contact face of the inner sealing sleeve and the outer sealing sleeve is in a matched slope shape. The protection end cover connected with the air duct side and the baffle door shaft are sealed through the arranged inner sealing sleeve; the contact faces of the inner sealing sleeve and the outer sealing sleeve are arranged to be matched inclined faces respectively, the inner sealing sleeve and the outer sealing sleeve are in a tight abutting state all the time, the inner sealing sleeve abuts against the baffle door shaft all the time after being pressed by the outer sealing sleeve, and therefore the inner sealing sleeve and the baffle door shaft are in a sealed state all the time.

Description

Technical Field

[0001] The present application relates to a baffle door shaft sealing structure, belonging to the field of baffle door shaft heads of smoke and air ducts of thermal power plants. Background Art

[0002] The damper door shaft head of the smoke and air duct of a thermal power plant generally uses fillers to squeeze and seal the flue side wall and the door shaft. However, the opening of the damper door requires the rotation of the damper door shaft driven by an external device. This causes the sealing system between the flue side wall and the door shaft to be easily worn during the long-term circulation of the damper door, resulting in leakage of the flue side wall, which not only causes on-site environmental pollution, but also poses a hidden danger to the normal operation of surrounding electrical and thermal control equipment. Utility Model Content

[0003] In view of this, the present application provides a baffle door shaft sealing structure to solve the problem that the sealing system in the prior art fails due to wear after long-term use, thereby causing the flue side wall to leak easily. The specific solution is:

[0004] A baffle door shaft sealing structure, comprising a sealing kit and a protective shell;

[0005] The protective shell includes a radial protective shell and a protective end cover;

[0006] The protective end covers are respectively located at both ends of the sealing kit, and the protective end covers are respectively detachably connected to the radial protective shell;

[0007] The sealing kit is sleeved outside the end of the baffle door shaft extending out of the air duct, the sealing kit is located on the inner side of the radial protection shell, and the sealing kit includes an inner sealing sleeve and an outer sealing sleeve which are fitted inside and outside;

[0008] The cross-section of the contact surface between the inner sealing sleeve and the outer sealing sleeve is in a matching slope shape;

[0009] The inner sealing sleeve is sleeved on the baffle door shaft, and the inner sealing sleeve is in a horizontally placed T-shaped structure as a whole. The end of the inner sealing sleeve facing the air duct is inserted into the protective end cover located at the end of the radial protective shell facing the air duct;

[0010] The outer sealing sleeve is provided with a return spring;

[0011] One end of the return spring abuts against the inner sealing sleeve, and the other end of the return spring abuts against a protective end cover located at one end of the radial protective housing facing the air duct.

[0012] Preferably, the radial protection shell is cylindrical, and an annular baffle is provided on the inner side of one end of the radial protection shell close to the air duct;

[0013] The inner ring of the annular baffle is sleeved on the baffle door shaft, the outer ring of the annular baffle is connected to the radial protection shell, one side of the annular baffle is connected to the end of the inner sealing sleeve away from the air duct, and an adjustment component is provided between the annular baffle and the protective end cover at the end of the radial protection shell facing away from the air duct;

[0014] The adjustment assembly comprises: a radial pressure block, a pressure spring and a pressure ring which are arranged in sequence from the inside to the outside;

[0015] There are a plurality of radial pressing blocks, and the plurality of radial pressing blocks are evenly arranged along the baffle door shaft in the circumferential direction, one end of the radial pressing block abuts against the baffle door shaft, and the ends of the plurality of radial pressing blocks abutting against the baffle door shaft abut against each other to form a sealing opening of the baffle door shaft;

[0016] One end of the compression spring is connected to the other end of the radial compression block, and the other end of the compression spring is connected to the inner wall of the compression ring;

[0017] The two ends of the pressure ring respectively abut against the annular baffle and the protective end cover located at one end of the radial protective shell facing away from the air duct.

[0018] Preferably, a limiting groove is provided on the inner side of the pressure ring;

[0019] The radial pressure block is inserted into the limiting groove toward one end of the pressure ring;

[0020] One end of the compression spring is connected to the limiting groove, and the other end of the compression spring is connected to one end of the radial pressure block inserted into the limiting groove.

[0021] Preferably, the depth of the limiting groove is smaller than the height of the radial pressure block, and the depth of the limiting groove is greater than the length of the compression spring in a natural state.

[0022] Preferably, the end of the radial pressing block facing the baffle door axis is an arc-shaped surface;

[0023] The arc surface matches the outer diameter of the baffle door shaft.

[0024] Preferably, the inner diameter of the annular baffle is smaller than the outer diameter of the end of the inner sealing sleeve facing away from the air duct.

[0025] Preferably, the outer sealing sleeve is a bellows.

[0026] Preferably, a sealing ring is provided between the protective end cover at one end of the radial protective housing facing away from the air duct and the baffle door shaft;

[0027] The inner ring of the sealing ring abuts against the baffle door shaft, and the outer ring of the sealing ring abuts against the protective end cover.

[0028] Preferably, a mounting ring is provided on the protective end cover at one end of the radial protective housing facing the air duct;

[0029] The mounting ring is an annular structure, one end of the mounting ring is connected to the side of the protective end cover located at the end of the radial protective shell facing the air duct facing away from the air duct, and the other end of the mounting ring is connected to the end of the outer sealing sleeve facing the air duct;

[0030] One end of the return spring facing the air duct is sleeved outside the mounting ring.

[0031] The beneficial effects of this application include:

[0032] The present application seals between the protective end cover connected to the air duct side and the baffle door shaft by setting an inner sealing sleeve; by setting an outer sealing sleeve outside the inner sealing sleeve, the contact surfaces of the inner sealing sleeve and the outer sealing sleeve are respectively set in matching inclined surfaces, so that the inner sealing sleeve and the outer sealing sleeve are always in a tightly abutting state, and the inner sealing sleeve is pressed by the outer sealing sleeve and always keeps in close contact with the baffle door shaft, so that the inner sealing sleeve is always in a sealed state with the baffle door shaft;

[0033] The present application sets an annular baffle on the inner side of the radial protective shell, and sets an adjustment assembly between the annular baffle and the protective end cover. The radial pressure block in the adjustment assembly is always in contact with the baffle door shaft due to the action of the compression spring, thereby maintaining a sealed state with the baffle door shaft, thereby preventing dust from entering the sealing kit. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is an exploded view of the assembly of a baffle door shaft sealing structure of the present application;

[0035] Figure 2 This is an assembly cross-sectional view of a baffle door shaft sealing structure of the present application;

[0036] Figure 3 This is an assembly diagram of a baffle door shaft sealing structure for this application;

[0037] Figure 4 The radial cross-section of an adjusting component in a baffle door shaft sealing structure of the present application is a schematic diagram.

[0038] List of parts and reference numerals:

[0039] 1- radial protective shell; 11- retaining ring, 101- annular baffle; 2- adjusting assembly; 20- mounting ring sleeve; 21- sealing block; 3- first end cover; 4- baffle door shaft; 5- inner sealing sleeve; 6- outer sealing sleeve; 7- reset spring; 8- second end cover; 9- connecting bolt; 10- sealing ring; 80- mounting ring platform; 10- sealing ring; 20- limiting groove; 21- radial pressure block; 22- compression spring; 23- compression ring. DETAILED DESCRIPTION

[0040] The present application is described in detail below with reference to embodiments, but the present application is not limited to these embodiments.

[0041] A baffle door shaft sealing structure, comprising: a protective shell with an overall cylindrical structure, a sealing kit, and an adjustment component;

[0042] The sealing kit includes an inner sealing sleeve 5, an outer sealing sleeve 6 and a return spring 7;

[0043] The inner sealing sleeve 5 is sleeved on the end of the baffle door shaft 4 extending out of the air duct. The inner sealing sleeve 5 is an isosceles trapezoid as a whole. The upper base of the isosceles trapezoid, i.e., the end with a small outer diameter, is arranged toward the air duct and abuts against the side wall of the air duct.

[0044] The inner wall of the outer sealing sleeve 6 matches the inclination of the outer wall of the inner sealing sleeve 5. The outer sealing sleeve 6 is a tapered tube, wherein the outer diameter of the outer sealing sleeve 6 decreases linearly in the direction toward the outside of the air duct, and the inner diameter of the outer sealing sleeve 6 increases linearly in the direction toward the outside of the air duct; so that the cross-section of the contact surface between the inner sealing sleeve 5 and the outer sealing sleeve 6 is in a matching slope shape; since the end of the inner sealing sleeve 5 facing the air duct is always in contact with the baffle door shaft 4 and the protective end cover located at the end of the radial protective shell 1 facing the air duct, sealing toward the air duct end is achieved; since the cross-section of the contact surface between the inner sealing sleeve 5 and the outer sealing sleeve 6 is in a matching slope structure, the outer sealing sleeve 6 is always pressed against the inner sealing sleeve 5.

[0045] A return spring 7 is arranged outside the outer sealing sleeve 6. Since the outer sealing sleeve 6 is a bellows, the return spring 7 can drive the outer sealing sleeve 6 to move axially along the inner sealing sleeve 5, thereby adjusting the axial direction, and further realizing that the outer sealing sleeve 6 is always pressed against the inner sealing sleeve 5.

[0046] The inner sealing sleeve 5 is a horizontally placed T-shaped structure, one end of the crossbeam of the T-shaped structure is arranged to face away from the air duct, and the specific structure of the inner sealing sleeve 5 is that a retaining ring 11 is arranged on the outer wall of the end of the inner sealing sleeve 5 facing the outside of the air duct, the retaining ring 11 extends out of the end of the inner sealing sleeve 5 facing the outside of the air duct, and an inner thread is arranged on the end of the inner sealing sleeve 5 extending out of the retaining ring 11;

[0047] The retaining ring 11 is fixedly connected to the outside of the inner sealing sleeve 5. In one embodiment of the present application, the retaining ring and the inner sealing sleeve 5 are integrally arranged;

[0048] In the present application, the specific structure of the protection shell is as follows: it includes a radial protection shell 1 and two protection end covers;

[0049] The radial protection housing 1 is sleeved outside the return spring 7;

[0050] The return spring 7 is sleeved outside the outer sealing sleeve 6, one end of the return spring abuts against the side of the retaining ring 11 facing the air duct, and the other end of the return spring 7 faces the air duct;

[0051] The two protective end covers are respectively located at the two ends of the radial protective shell 1, and the two protective end covers include a first end cover 3 and a second end cover 8; the first end cover 3 and the second end cover 8 are respectively detachably connected to the radial protective shell 1 (wherein the detachable connection is by but not limited to screw connection).

[0052] Among them, the first end cover 3 is located at the end of the radial protection shell 1 facing the outside of the air duct; the second end cover 8 is located at the end of the radial protection shell 1 facing the inside of the air duct, and the second end cover 8 is sleeved on the end of the inner sealing sleeve 5 facing the inside of the air duct. During installation, the second end cover 8 is fixedly connected to the outer wall of the air duct on the side facing the air duct.

[0053] Furthermore, an annular baffle 101 is provided on the inner side of one end of the radial protection shell 1 facing the outside of the air duct;

[0054] The annular baffle 101 is located on the side of the retaining ring 11 facing the outside of the air duct. The outer ring of the annular baffle 101 is fixedly connected to the radial protection shell 1. A connecting protrusion is provided on the side of the annular baffle 101 facing the retaining ring 11. The connecting protrusion is hollow and connected to the side of the annular baffle 101 facing the air duct. An external thread matching the internal thread is provided on the outside of the connecting protrusion. The connecting protrusion is threadedly connected to one end of the inner sealing sleeve 5 extending out of the retaining ring 11.

[0055] In one embodiment of the present application, the annular baffle 101 is integrally provided with the radial protection shell 1 .

[0056] Furthermore, the radial protection shell 1 is cylindrical, and an annular baffle 101 is arranged on the inner side of one end of the radial protection shell 1 close to the air duct;

[0057] The inner ring of the annular baffle is sleeved on the baffle door shaft 4, the outer ring of the annular baffle 101 is connected to the radial protection shell, one side of the annular baffle 101 is connected to the end of the inner sealing sleeve away from the air duct, and an adjustment component 2 is arranged between the annular baffle and the protection end cover (i.e., the first end cover 3) at the end of the radial protection shell facing away from the air duct;

[0058] The adjustment assembly 2 comprises: a radial pressure block 21, a pressure spring 22 and a pressure ring 23 which are arranged in sequence from the inside to the outside;

[0059] There are several radial pressing blocks, at least two of which are arranged uniformly along the baffle door shaft 4, one end of the radial pressing block abuts against the baffle door shaft 4, and the ends of several radial pressing blocks abutting against the baffle door shaft abut against each other to form a sealing opening of the baffle door shaft, that is, two adjacent sides of adjacent radial pressing blocks facing one end of the baffle door shaft 4 abut against each other;

[0060] One end of the compression spring 22 is connected to the other end of the radial compression block, and the other end of the compression spring 22 is connected to the inner wall of the compression ring;

[0061] The two ends of the pressure ring respectively abut against the annular baffle and the protective end cover located at one end of the radial protective shell facing away from the air duct.

[0062] Furthermore, a limiting groove 20 is provided on the inner side of the pressure ring;

[0063] The radial pressure block 21 is inserted into the limiting groove 20 toward one end of the pressure ring;

[0064] One end of the compression spring 22 is connected to the limiting groove 20 , and the other end of the compression spring 22 is connected to one end of the radial pressure block inserted into the limiting groove.

[0065] Furthermore, the depth of the limiting groove 20 is smaller than the height of the radial pressure block 21 , and the depth of the limiting groove is greater than the length of the compression spring 22 in a natural state.

[0066] Furthermore, one end of the radial pressing block 21 facing the baffle door axis is an arc-shaped surface;

[0067] The arc surface matches the size and shape of the outer diameter of the baffle door shaft 4.

[0068] Furthermore, the inner diameter of the annular baffle 101 is smaller than the outer diameter of the end of the inner sealing sleeve facing away from the air duct;

[0069] Furthermore, a sealing ring 10 is provided between the protective end cover (i.e., the first end cover 3) at one end of the radial protective housing facing away from the air duct and the baffle door shaft 4;

[0070] The inner ring of the sealing ring abuts against the baffle door shaft, and the outer ring of the sealing ring abuts against the protective end cover.

[0071] Furthermore, a mounting ring 80 is provided on the protective end cover (i.e., the second end cover 8) located at one end of the radial protective housing facing the air duct;

[0072] The mounting ring is an annular structure, one end of the mounting ring is connected to the side of the protective end cover located at the end of the radial protective shell facing the air duct facing away from the air duct, and the other end of the mounting ring is connected to the end of the outer sealing sleeve facing the air duct;

[0073] One end of the return spring 7 facing the air duct is sleeved outside the mounting ring.

[0074] In the present application, the baffle door shaft 4 passes through the air duct and sequentially passes through the inner sealing sleeve 5, the annular baffle 101, the adjustment component 2, and the first end cover 3, and then is connected to the external device. A sealing ring 10 is arranged between the first end cover 3 and the baffle door shaft 4, and the sealing ring 10 is sleeved on the baffle door shaft 4. The sealing ring 10 seals the connection between the first end cover 3 and the baffle door shaft 4;

[0075] The first end cover 3 is located on the side of the pressure ring facing the outside of the air duct, the first end cover 3 is sleeved on the baffle door shaft 4, and is connected to the radial protection shell 1, and the entire second adjustment assembly 2 is located in the cavity formed by the first end cover 3 and the annular baffle 101;

[0076] When the baffle door shaft 4 moves axially, the annular sealing block 21 is always sealed with the baffle door shaft 4 due to the compression spring 22, thereby preventing the annular sealing block 21 from preventing dust from entering the protective shell from one end of the first end cover 3 when the baffle door shaft 4 moves.

[0077] Furthermore, the inner diameter of the annular baffle 101 is smaller than the outer diameter of the inner sealing sleeve 5 .

[0078] In the present application, the detachable connection between the radial protection shell 1 and the first end cover 3 and the second end cover 8 is achieved by connecting bolts 9;

[0079] In one embodiment of the present application, the mounting ring 80 is integrally formed with the first end cover 3 .

[0080] The installation process of this application is:

[0081] The first step is to connect the end with a larger outer diameter of the outer sealing sleeve 6 to the end of the mounting ring 80 of the second end cover 8 away from the second end cover 8, and to sleeve the return spring 7 outside the outer sealing sleeve 6. At this time, one end of the return spring 7 is sleeved on the mounting ring 80, and the installation of the second end cover 8, the return spring 7 and the outer sealing sleeve 6 is completed;

[0082] In the second step, the second end cover 8, the return spring 7 and the outer sealing sleeve 6 assembly installed in the first step are installed from the end with the smaller outer diameter of the inner sealing sleeve 5 to the end with the larger outer diameter to complete the installation of the inner and outer sealing sleeves;

[0083] The third step is to sleeve the inner sealing sleeve 5 with the outer sealing sleeve assembly installed on the baffle door shaft 4 until the end with a smaller outer diameter of the inner sealing sleeve 5 abuts against the side wall of the air duct, and then fix the second end cover 8 to the side wall of the air duct;

[0084] The fourth step is to cover the radial protective shell 1 on the outside of the reset spring 7, and connect the second end cover 8 to the radial protective shell 1. During installation, the connection between the second end cover 8 and the radial protective shell 1 is sealed;

[0085] The fifth step is to install the adjustment assembly 2, and put the connection opening formed by each radial pressing block 21 on the baffle door shaft 4, so that each radial pressing block 21 abuts against the baffle door shaft 4;

[0086] Step 6: Sleeve the sealing ring 10 on the mounting hole in the middle of the first end cover 3, then sleeve the first end cover 3 with the sealing ring 10 on the baffle door shaft 4, and move the first end cover 3 toward the side of the annular baffle 101 until one end of the pressure ring 23 abuts against the side of the annular baffle 101 facing away from the baffle ring 11;

[0087] Then, the first end cover 3 is fixed to the end of the radial protection shell 1 facing away from the second end cover 8, thereby completing the installation of the entire baffle door shaft sealing structure.

[0088] The above are only a few embodiments of the present application and do not constitute any form of limitation to the present application. Although the present application is disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technician familiar with the profession, without departing from the scope of the technical solution of the present application, using the technical content disclosed above to make slight changes or modifications are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A baffle door shaft sealing structure, characterized in that: Includes sealing kit and protective housing; The protective shell includes a radial protective shell and a protective end cover; The protective end covers are respectively located at both ends of the sealing kit, and the protective end covers are respectively detachably connected to the radial protective shell; The sealing kit is sleeved outside the end of the baffle door shaft extending out of the air duct, the sealing kit is located on the inner side of the radial protection shell, and the sealing kit includes an inner sealing sleeve and an outer sealing sleeve which are fitted inside and outside; The cross-section of the contact surface between the inner sealing sleeve and the outer sealing sleeve is in a matching slope shape; The inner sealing sleeve is sleeved on the baffle door shaft, and the inner sealing sleeve is in a horizontally placed T-shaped structure as a whole. The end of the inner sealing sleeve facing the air duct is inserted into the protective end cover located at the end of the radial protective shell facing the air duct; The outer sealing sleeve is provided with a return spring; One end of the return spring abuts against the inner sealing sleeve, and the other end of the return spring abuts against a protective end cover located at one end of the radial protective housing facing the air duct.

2. A baffle door shaft sealing structure according to claim 1, characterized in that: The radial protection shell is cylindrical, and an annular baffle is arranged on the inner side of one end of the radial protection shell close to the air duct; The inner ring of the annular baffle is sleeved on the baffle door shaft, the outer ring of the annular baffle is connected to the radial protection shell, one side of the annular baffle is connected to the end of the inner sealing sleeve away from the air duct, and an adjustment component is provided between the annular baffle and the protective end cover at the end of the radial protection shell facing away from the air duct; The adjustment assembly comprises: a radial pressure block, a pressure spring and a pressure ring which are arranged in sequence from the inside to the outside; There are a plurality of radial pressing blocks, and the plurality of radial pressing blocks are evenly arranged along the baffle door shaft in the circumferential direction, one end of the radial pressing block abuts against the baffle door shaft, and the ends of the plurality of radial pressing blocks abutting against the baffle door shaft abut against each other to form a sealing opening of the baffle door shaft; One end of the compression spring is connected to the other end of the radial compression block, and the other end of the compression spring is connected to the inner wall of the compression ring; The two ends of the pressure ring respectively abut against the annular baffle and the protective end cover located at one end of the radial protective shell facing away from the air duct.

3. A baffle door shaft sealing structure according to claim 2, characterized in that: A limiting groove is provided on the inner side of the pressure ring; The radial pressure block is inserted into the limiting groove toward one end of the pressure ring; One end of the compression spring is connected to the limiting groove, and the other end of the compression spring is connected to one end of the radial pressure block inserted into the limiting groove.

4. A baffle door shaft sealing structure according to claim 3, characterized in that: The depth of the limiting groove is smaller than the height of the radial pressure block, and the depth of the limiting groove is greater than the length of the compression spring in a natural state.

5. The baffle door shaft sealing structure according to claim 2, characterized in that: One end of the radial pressing block facing the baffle door axis is an arc-shaped surface; The arc surface matches the outer diameter of the baffle door shaft.

6. The baffle door shaft sealing structure according to claim 2, characterized in that: The inner diameter of the annular baffle is smaller than the outer diameter of the end of the inner sealing sleeve facing away from the air duct.

7. The baffle door shaft sealing structure according to claim 1, characterized in that: The outer sealing sleeve is a bellows.

8. The baffle door shaft sealing structure according to claim 1, characterized in that: A sealing ring is provided between the protective end cover at one end of the radial protective housing facing away from the air duct and the baffle door shaft; The inner ring of the sealing ring abuts against the baffle door shaft, and the outer ring of the sealing ring abuts against the protective end cover.

9. The baffle door shaft sealing structure according to claim 1, characterized in that: A mounting ring is provided on the protective end cover located at one end of the radial protective housing facing the air duct; The mounting ring is an annular structure, one end of the mounting ring is connected to the side of the protective end cover located at the end of the radial protective shell facing the air duct facing away from the air duct, and the other end of the mounting ring is connected to the end of the outer sealing sleeve facing the air duct; One end of the return spring facing the air duct is sleeved outside the mounting ring.

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