A sealing structure for negative pressure box of rake type sootblower

Abstract

The present invention discloses a sealing structure for a negative pressure box of a rake-type soot blower, and relates to the technical field of waste gas treatment. It is used to solve the problems of large degree of wear of the sealing strip and easy air leakage in the existing rake-type soot blower for denitration. The rake-type soot blower comprises: a negative pressure box, a cylinder, a slot, and a flange; the first end of the cylinder is fixed above the negative pressure box through a cylinder frame, the second end of the cylinder is connected to the first end of a connecting rod, and the second end of the connecting rod is respectively connected to the protruding ends of two slots; when the connecting rod reciprocates perpendicular to the negative pressure box, the two slots are driven to open and close by the connecting rod; the connecting ends of the two slots are arranged on one side of the negative pressure box, and flanges and the sealing gaskets are arranged in sequence between the connecting ends of the two slots and the negative pressure box; a semicircular sealing ring is arranged in the slot, and when the two slots are closed, the semicircular sealing rings are in contact with the outer surface of the outer tube, and the slot is in contact with a circular sealing ring arranged on the side of the flange away from the negative pressure box.

Description

Technical Field

[0001] The invention relates to the technical field of waste gas treatment, and more specifically to a sealing structure of a negative pressure box of a rake-type sootblower. Background Art

[0002] At present, the rake soot blower for denitrification is composed of a sports car structure, a lifting valve, inner and outer pipes, a negative pressure box and other components. The seal between the outer tube of the soot blower and the denitrification shell is composed of four 1 / 4 circular slots, a graphite packing seal and a spring. The graphite packing seal is installed in the slot, and the four 1 / 4 circular slots are formed into a full circle by a circular spring. This structure is a sealing component and is installed in the negative pressure box. Ensure that when the outer tube moves axially with the soot blower sports car, the graphite packing seal can fit on the outer wall of the outer tube, thereby achieving the sealing effect.

[0003] The existing rake soot blower has the following disadvantages when used in denitrification equipment: due to the high temperature of flue gas treated by the denitrification system, the shell of the denitrification equipment expands when heated. In addition, the error in the installation of the rake soot blower itself causes a certain degree of deviation in the coaxiality between the outer tube of the soot blower and the rake tube. This deviation causes the plane of the graphite packing sealing strip to be not perpendicular to the outer tube, and there is a certain gap between the outer tube, which causes air leakage in the equipment; the operating environment of the outer tube of the rake soot blower is poor, and a certain amount of butter is applied to the outer surface of the outer tube itself. At the same time, a certain amount of dust will adhere to the surface of the outer tube during the backward movement of the outer tube of the soot blower, which will cause the graphite packing sealing strip to be poorly sealed and aggravate the wear of the sealing strip; the sealing assembly and the negative pressure box are connected by two bolts, and the sealing between the negative pressure box and the sealing assembly is not considered, which will also cause air leakage in the denitrification shell.

[0004] In summary, the existing rake-type soot blowers for denitrification have the problems of large degree of wear of the sealing strip and easy air leakage. Summary of the invention

[0005] The embodiment of the present invention provides a negative pressure box sealing structure of a rake soot blower, which is used to solve the problems of large wear degree of sealing strip and easy air leakage in the existing rake soot blower for denitration.

[0006] The embodiment of the present invention provides a sealing structure of a negative pressure box of a rake-type sootblower, comprising: a semicircular sealing ring, a slot, a negative pressure box, a flange, a cylinder, a circular sealing ring, and a sealing gasket;

[0007] The first end of the cylinder is fixed above the negative pressure box through a cylinder frame, the second end of the cylinder is connected to the first end of the connecting rod, and the second end of the connecting rod is connected to the protruding ends of the two slots respectively; when the connecting rod reciprocates perpendicular to the negative pressure box, it drives the two slots to open and close;

[0008] The connecting ends of the two card slots are arranged on one side of the negative pressure box, and the flange and the sealing gasket are arranged in sequence between the connecting ends of the two card slots and the negative pressure box;

[0009] The semicircular sealing ring is arranged in the groove. When the two grooves are closed, the semicircular sealing rings are in contact with the outer surface of the outer tube. The inner annular arc surface of the groove close to the negative pressure box is in contact with the circular sealing ring arranged on the side of the flange away from the negative pressure box.

[0010] Preferably, the sealing gasket and the flange are sequentially arranged on one side of the negative pressure box, and the sealing gasket is located between the negative pressure box and the flange.

[0011] Preferably, it further comprises a frame, both ends of which are provided with mounting holes, the negative pressure box is arranged on the mounting holes through a bolt shaft, and the negative pressure box can rotate around the bolt shaft.

[0012] Preferably, the two card slots are U-shaped card slots, and when the two U-shaped card slots are closed, a circular hole is formed;

[0013] When the two U-shaped slots are closed, the outer tube passes through the circular hole, and the outer surfaces of the outer tube are in contact with the semicircular sealing ring.

[0014] Preferably, a boss is provided on a side of the flange away from the negative pressure box, and the boss is used to set the circular sealing ring.

[0015] The embodiment of the present invention provides a method for controlling a sealing structure of a negative pressure box of a rake sootblower, comprising:

[0016] When the cylinder is controlled by PLC to move perpendicularly to the negative pressure box and toward the negative pressure box, the connecting rod connected to the second end of the cylinder drives the two slots to rotate, so that the two slots are in an open state, and the rake soot blower works;

[0017] When the cylinder is controlled by PLC to move perpendicularly to the negative pressure box and away from the negative pressure box, the connecting rod drives the two slots to rotate so that the two slots are in a closed state, the rake soot blower stops working, and the semicircular density ring on the inner side of the slot contacts the outer surface of the outer tube passing through the slot, and the inner annular arc surface on the side of the slot close to the negative pressure box contacts the circular sealing ring on the flange.

[0018] The embodiment of the present invention provides a sealing structure of a negative pressure box of a rake-type soot blower, comprising: a semicircular sealing ring, a slot, a negative pressure box, a flange, a cylinder, a circular sealing ring, and a sealing gasket; the first end of the cylinder is fixed above the negative pressure box through a cylinder frame, the second end of the cylinder is connected to the first end of a connecting rod, and the second end of the connecting rod is respectively connected to the protruding ends of two slots; when the connecting rod reciprocates perpendicular to the negative pressure box, the two slots are driven to open and close by the connecting rod; the connecting ends of the two slots are arranged on one side of the negative pressure box, and the flange and the sealing gasket are arranged in sequence between the connecting ends of the two slots and the negative pressure box; the semicircular sealing ring is arranged in the slot, and when the two slots are closed, the semicircular sealing rings are both in contact with the outer surface of the outer tube, and the inner annular arc surface of the slot close to the negative pressure box is in contact with the circular sealing ring arranged on the side of the flange away from the negative pressure box. The sealing gasket added between the flange and the negative pressure box of the rake type soot blower can ensure the sealing problem between the negative pressure box and the sealing assembly, and solves the problem of air leakage between the negative pressure box and the sealing assembly; furthermore, the opening and closing states of the slot can be realized through the movement of the cylinder, a semicircular sealing ring is arranged in the slot, and a circular sealing ring is arranged on the surface where the inner annular arc surface of the slot close to the negative pressure box side and the flange ring are in contact, thereby solving the problem of sealing air leakage between the outer tube and the pin-off shell when the rake type soot blower stops working. Furthermore, through this arrangement, the service life of the sealing strip can be extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0020] Figure 1 A schematic diagram of the installation position structure of a negative pressure box sealing structure of a rake-type sootblower provided in an embodiment of the present invention;

[0021] Figure 2 A schematic structural diagram of the negative pressure box sealing structure of a rake-type sootblower provided in an embodiment of the present invention in an open state;

[0022] Figure 3 A schematic diagram of the closed state structure of the negative pressure box sealing structure of the rake sootblower provided by an embodiment of the present invention;

[0023] Figure 4 For Figure 3 The corresponding AA section structure diagram;

[0024] Figure 5 for Figure 4 ⅠAmplified schematic diagram of area;

[0025] In the figure, 1~negative pressure box; 2~sealing gasket; 3~cylinder frame; 4~cylinder; 5~flange; 6~sealing ring; 7~slot; 8~semicircular sealing ring; 9~connecting rod; 10~outer tube; 11~frame. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Figure 1 A schematic diagram of the installation position structure of a negative pressure box sealing structure of a rake-type sootblower provided in an embodiment of the present invention; Figure 2 A schematic structural diagram of the negative pressure box sealing structure of a rake-type sootblower provided in an embodiment of the present invention in an open state; Figure 3 A schematic diagram of the closed state structure of the negative pressure box sealing structure of the rake sootblower provided by an embodiment of the present invention; Figure 4 For Figure 3 The corresponding AA section structure diagram; Figure 5 for Figure 4 Ⅰ Area Enlarged Schematic Diagram; The following is combined Figures 1 to 5 Taking the negative pressure box sealing structure of the rake sootblower as an example, the sealing structure is introduced in detail.

[0028] The sealing structure of the negative pressure box 1 of the rake-type sootblower provided in the embodiment of the present invention mainly comprises: a sealing component, a negative pressure box 1 and a cylinder 4.

[0029] Specifically, the sealing assembly includes a sealing gasket 2, a flange 5, a sealing ring 6, a slot 7, a semicircular sealing ring 8, etc. The sealing gasket 2 and the flange 5 are fixed on one side of the negative pressure box 1, and the sealing gasket 2 is located between the flange 5 and the negative pressure box 1. By arranging the sealing gasket 2 between the flange 5 and the negative pressure box 1, the sealing problem between the negative pressure box 1 and the flange 5 can be ensured, thereby solving the problem of air leakage between the negative pressure box 1 and the flange 5.

[0030] In this embodiment, the negative pressure box 1 is arranged on the frame 11, wherein mounting holes are arranged at both ends of the frame 11, and both ends of the negative pressure box 1 are arranged on the mounting holes through bolt shafts, so that the negative pressure box 1 can be arranged on the frame 11. Further, since the negative pressure box 1 is arranged on the mounting holes through the bolt shafts, the negative pressure box 1 can rotate around the bolt shafts.

[0031] Further, the first end of the cylinder 4 is arranged above the negative pressure box 1 through the cylinder 4 frame 3, the second end of the cylinder 4 is fixedly connected to the first end of the connecting rod 9, and the second end of the connecting rod 9 is connected to the protruding ends of the two card slots 7 respectively. The cylinder 4 frame 3 is arranged on the negative pressure box 1, which can ensure that the connecting rod 9 can reciprocate perpendicular to the negative pressure box 1. In the embodiment of the present invention, when the connecting rod 9 reciprocates perpendicular to the negative pressure box 1, since the second end of the connecting rod 9 is respectively connected to the protruding ends of the two card slots 7, the two card slots 7 can be driven to operate, thereby realizing the opening and closing of the card slots 7.

[0032] Furthermore, the connecting ends of the two card slots 7 are arranged on one side of the negative pressure box 1 through a pin shaft, that is, the two card slots 7 can rotate around the pin shaft. In the embodiment of the present invention, a flange 5 and a sealing gasket 2 are also arranged between the two card slots 7 and the negative pressure box 1, that is, the two card slots 7 and the flange 5 are arranged on the same side of the negative pressure box 1. Among them, the inner annular arc of the two card slots 7 on the side close to the negative pressure box 1 is in contact with the circular sealing ring 6 arranged on the side of the flange 5 away from the negative pressure box 1. Through this arrangement, when the two card slots 7 are closed, the two card slots 7 can be completely in contact with the circular sealing ring 6, thereby achieving sealing between the card slots 7 and the negative pressure box 1.

[0033] It should be noted that, in order to be able to arrange the circular sealing ring 6 on the side of the flange 5 away from the negative pressure box 1, preferably, a boss is provided on the flange 5, through which the circular sealing ring 6 can be conveniently arranged.

[0034] Furthermore, a semicircular sealing ring 6 is provided on the inner side of the slot 7, that is, a semicircular sealing ring 6 is provided on the inner side of each slot 7. Since the connecting ends of the two slots 7 are provided on one side of the negative pressure box 1, the protruding ends of the two slots 7 are respectively connected to the second end of the connecting rod 9. Therefore, when the cylinder 4 reciprocates perpendicular to the negative pressure box 1, the protruding ends of the two slots 7 will correspondingly drive the two slots 7 to open or close, thereby realizing the opening and closing of the slots 7.

[0035] In the embodiment of the present invention, both of the two slots 7 are U-shaped slots 7, and the connecting ends of the two U-shaped slots 7 are arranged on the negative pressure box 1, and the protruding ends of the two U-shaped slots 7 are connected to the second end of the connecting rod 9. When the two U-shaped slots 7 are closed under the drive of the connecting rod 9, the two U-shaped slots 7 form a circular hole. Furthermore, the outer surface of the outer tube 10 passing through the circular hole will contact the semicircular sealing ring 6 arranged on the inner side of the U-shaped slot 7. Through this arrangement, when the two U-shaped slots 7 are closed, the outer surface of the outer tube 10 can be bent and contact with the two semicircular sealing rings 6, thereby improving the sealing between the slot 7 and the outer tube 10 and avoiding the problem of sealing leakage between the outer tube 10 and the de-pinning shell.

[0036] In order to more clearly introduce the rake soot blower, the control method of the rake soot blower is introduced below. It should be noted that the rake soot blower mainly controls the cylinder 4 through the PLC, so that the slot 7 can be opened and closed.

[0037] Specifically, the cylinder 4 is controlled by PLC. Generally, the opening time of the cylinder 4 is about 3 seconds earlier than the starting time of the rake soot blower. When the PLC controls the cylinder 4 to open, the connecting rod 9 extends out, that is, the connecting rod 9 is perpendicular to the negative pressure box 1 and moves toward the negative pressure box 1, and the connecting rod 9 is connected to the protruding ends of the two slots 7. The connecting rod 9 drives the two slots 7 to rotate, so that the two slots 7 reach the open state, and the rake soot blower performs a blowing action; when the rake soot blower completes the blowing, the PLC controls the cylinder 4 to close, and the connecting rod 9 is retracted, that is, the connecting rod 9 is perpendicular to the negative pressure box 1 and moves away from the negative pressure box 1, and the connecting rod 9 drives the two slots 7 to rotate so that the two slots 7 reach the closed state. In this state, the semicircular density rings on the inner sides of the two slots 7 are in contact with the outer surface of the outer tube 10 that passes through the slot 7, and the inner annular arc surface of the slot 7 close to the negative pressure box 1 is in contact with the circular sealing ring 6 on the flange 5. Thereby, the problem of air leakage between the negative pressure box 1 and the flange 5 and the problem of air leakage between the clamping groove 7 and the outer tube 10 are solved.

[0038] In summary, an embodiment of the present invention provides a sealing structure of a negative pressure box of a rake-type soot blower, comprising: a semicircular sealing ring, a slot, a negative pressure box, a flange, a cylinder, a circular sealing ring, and a sealing gasket; the first end of the cylinder is fixed above the negative pressure box through a cylinder frame, the second end of the cylinder is connected to the first end of a connecting rod, and the second end of the connecting rod is respectively connected to the protruding ends of two slots; when the connecting rod reciprocates perpendicular to the negative pressure box, the two slots are driven to open and close by the connecting rod; the connecting ends of the two slots are arranged on one side of the negative pressure box, and the flange and the sealing gasket are arranged in sequence between the connecting ends of the two slots and the negative pressure box; the semicircular sealing ring is arranged in the slot, and when the two slots are closed, the semicircular sealing rings are both in contact with the outer surface of the outer tube, and the inner annular arc surface of the slot close to the negative pressure box is in contact with the circular sealing ring arranged on the side of the flange away from the negative pressure box. The sealing gasket added between the flange and the negative pressure box in the sealing structure of the rake type soot blower negative pressure box can ensure the sealing problem between the negative pressure box and the sealing assembly, and solve the problem of air leakage between the negative pressure box and the sealing assembly; furthermore, the opening and closing states of the card slot can be realized through the movement of the cylinder, a semicircular sealing ring is arranged in the card slot, and a circular sealing ring is arranged on the contact surface between the card slot and the flange ring, thereby solving the problem of sealing air leakage between the outer tube and the pin-off shell when the rake type soot blower stops working; furthermore, through this arrangement, the service life of the sealing strip can be extended.

[0039] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0040] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A sealing structure for a negative pressure box of a rake sootblower, characterized in that: include: Semicircular sealing ring, card slot, negative pressure box, flange, cylinder, circular sealing ring, sealing gasket, connecting rod; The first end of the cylinder is fixed above the negative pressure box through a cylinder frame, the second end of the cylinder is connected to the first end of the connecting rod, and the second end of the connecting rod is connected to the protruding ends of the two slots respectively; when the connecting rod reciprocates perpendicular to the negative pressure box, the two slots are driven to open and close through the connecting rod; The connecting ends of the two card slots are arranged on one side of the negative pressure box, and the flange and the sealing gasket are arranged in sequence between the connecting ends of the two card slots and the negative pressure box; The semicircular sealing ring is arranged in the groove. When the two grooves are closed, the semicircular sealing rings are in contact with the outer surface of the outer tube. The inner annular arc surface of the groove close to the negative pressure box is in contact with the circular sealing ring arranged on the side of the flange away from the negative pressure box.

2. The sealing structure of the negative pressure box of the rake sootblower according to claim 1, characterized in that: The sealing gasket and the flange are sequentially arranged on one side of the negative pressure box, and the sealing gasket is located between the negative pressure box and the flange.

3. The sealing structure of the negative pressure box of the rake sootblower according to claim 1, characterized in that: It also includes a frame, both ends of which are provided with mounting holes, the negative pressure box is arranged on the mounting holes through a bolt axis, and the negative pressure box can rotate around the bolt axis.

4. The sealing structure of the negative pressure box of the rake sootblower according to claim 1, characterized in that: The two card slots are U-shaped card slots, and when the two U-shaped card slots are closed, a circular hole is formed; When the two U-shaped slots are closed, the outer tube passes through the circular hole, and the outer surfaces of the outer tube are in contact with the semicircular sealing ring.

5. The sealing structure of the negative pressure box of the rake sootblower according to claim 1, characterized in that: A boss is arranged on one side of the flange away from the negative pressure box, and the boss is used to arrange the circular sealing ring.

6. A method for controlling the sealing structure of a negative pressure box of a rake sootblower, characterized in that: The negative pressure box sealing structure of a rake sootblower applied to any one of claims 1 to 5 comprises: When the cylinder is controlled by PLC to move perpendicularly to the negative pressure box and toward the negative pressure box, the connecting rod connected to the second end of the cylinder drives the two slots to rotate, so that the two slots are in an open state, and the rake soot blower works; When the cylinder is controlled by PLC to move perpendicularly to the negative pressure box and away from the negative pressure box, the connecting rod drives the two slots to rotate so that the two slots are in a closed state, the rake soot blower stops working, and the semicircular density ring on the inner side of the slot contacts the outer surface of the outer tube passing through the slot, and the inner annular arc surface on the side of the slot close to the negative pressure box contacts the circular sealing ring on the flange.

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