RU180228U1 - DOUBLE VALVE FLASH VALVE - Google Patents

Abstract

Scope: heat power engineering. The flasher valve (KM) is installed on the outlet heat (PM) 10 from the bulk feed hopper into the grinding mill of the boiler unit dust preparation system. KM contains a housing 20 and a flat shutter (TK) 30 connected to a lever-hinge system (RCS) 40 of its rotation under the influence of counterbalanced loads (PG) 50. TK 30 KM is double-wing with partial overlap of the free ends of the shutters 31, 32 in the closed position . Each of the flaps 31, 32 KM has a rectangular shape and is equipped on the periphery with a profile sealing coating 311, 321 of heat-resistant rubber. The lever-hinge system (RCS) 40 is made with the arrangement of the PG 50 on one side of the KM and the kinematic scheme, which ensures the closing of the shutters 31, 32 in the sequence necessary for sealing the shutter PZ 30. EFFECT: simplification of the KM design, elimination of gaps between the shutter of the KM KZ and the PM bunker estrus, even pouring of coal over the estrus section. 4 ill.

Description

Technical field

The utility model relates to the field of thermal energy and can be used in dust preparation systems of thermal power plants operating on solid fuel.

State of the art

When operating a dust preparation system for coal-fired boilers, it is important to ensure the integrity of the installation. This is due to the fact that increased suction in the tract lead to a deterioration in the efficiency of the drying-mill system and to a violation of the conditions for its safe operation. To ensure the tightness of the dust preparation systems at TPPs, flasher valves (KM) installed on hopper chutes are used.

Known is the KM adopted as a prototype of the patented utility model, installed on the outlet heat from the lump fuel supply hopper to the grinding mill of the boiler unit dust preparation system, comprising a housing, the upper part of which is hermetically mated to the outlet portion of said heat placed inside it and a flat single-leaf (single-leaf) shutter connected to the lever-articulated system of its rotation under the influence of counterweight (SU 1495577 A1 of 07.23.1989 [1].) According to [1] the lever-rotary mechanism The valve is equipped with two clamps, providing a sharp opening and closing of the shutter in order to prevent the passage of fuel passing on it.

KM according to [1] inherent in the following disadvantages:

- the KM shutter rotation mechanism is in the zone of possible contact with coal dust, which reduces the reliability of its operation;

- low maintainability of the structure;

- complexity of installation;

- bulkiness and increased metal consumption of the structure;

- insufficient tightness of the system in the closed position of the shutter KM;

- uneven filling with fuel the output section of the CM when it is opened, which can lead to clogging with fuel;

- low range of regulation of the mass of fuel at which the KM shutter opens.

Utility Model Disclosure

The objective of the patented utility model is to ensure high tightness of the system and the reliability of the KM, and the technical result is to simplify the design of the KM, eliminate the gaps between the KM shutter and the bunker heat, and spread coal evenly over the heat section.

To solve this problem, by achieving the indicated technical results in the CM installed on the outlet heat from the lump fuel supply hopper to the grinding mill of the dust preparation system of the boiler unit, which contains a housing, the upper part of which is hermetically connected to the outlet part of the specified heat, placed inside it, and a flat shutter, connected to the lever-articulated system of its rotation under the influence of counterweight.

According to the patented utility model, the KM shutter is made of two-leaf (two-leaf) with a partial overlap of the free ends of the wings in the closed position,

moreover, each of the KM flaps has a rectangular shape and is equipped on the periphery with a profile sealing coating of heat-resistant rubber, which ensures complete sealing of the shutter when closing the flaps,

and the lever-hinge system for its rotation is made with the arrangement of counterbalanced weights on one side of the KM and a kinematic scheme that ensures the closing of the valves in the sequence necessary for sealing the shutter.

A causal relationship between the totality of the features of a patentable utility model and the technical results achieved is as follows. The execution of the KM shutter with a double leaf with partial overlapping of the free ends of the flaps in the closed position, each of the KM flaps having a rectangular shape and equipped with a profile sealing coating of heat-resistant rubber on the periphery, completely eliminates the gaps between the KM shutter and the hopper chute, and also ensures the double leaf design shutter evenly over the heat section coal sprinkling. The arrangement of counterbalanced loads on one side of the KM and the kinematic scheme that provides the shutter closures in the sequence necessary for sealing the shutter can eliminate the possibility of a loose shutter shutter with a violation of the tightness of the dust system.

Simplification of the design, ensuring compactness with a corresponding reduction in metal consumption, as well as improving maintainability and simplifying the installation of KM are achieved by eliminating the need to use the KM design according to [1] with the means of fixing and abruptly shutting its shutter under the action of return springs in order to prevent sticking of fuel. According to the patented utility model, fuel sticking is prevented by the full opening of the outlet section of the estrus due to the two-leaf shutter structure.

Brief Description of the Drawings

In FIG. 1 schematically shows a general view of the CM in the closed position of the shutter; in FIG. 2 - view of the lever-hinge system of the shutter KM in the closed position; in FIG. 3 is a general view of the KM in the open position of the shutter; in FIG. 4 is a view of the lever-hinge system of the KM shutter in the open position.

Legend

KU - O-ring seal;

KM - flasher valve;

GHG - counterweight;

PZ - flat shutter;

ON - rotary axis;

PS - subsystems;

RCS - lever-hinge system;

PM - estrus.

List of drawing items

10 - PM; 11, 12 - respectively, the upper and lower sections of the PM; 13 - KU; 20 - case; 30 - PZ; 31, 32 - sash; 311, 312 - profile sealing coating, respectively 31, 32; 40 - RCS; 41, 42 - PS; 421, 422, 423 - links of a three-link lever; 424, 425, 426 - inter-link joints; 43 - software; 50 - PG

Utility Model Implementation

KM is installed (Fig. 1, 3) at the outlet end of the estrus (PM) 10 from the lump fuel supply hopper to the grinding mill of the boiler unit dust preparation system (not shown) and contains a housing 20, the upper part of which is hermetically mated to the outlet portion of the indicated inside estrus and a flat shutter (ПЗ) 30, which is connected to a lever-hinge system (RCS) 40 (Fig. 2, 4) of its rotation under the influence of counterbalanced loads (ПГ) 50. To reduce the sticking of coal, PM 10 is made of two (upper and lower) sections respectively 11 and 12 with n a large cone-shaped extension of the lower ones. The sealing of the junction of the housing 20 with the lower part of the PM 10 heat pipe is provided by an annular sealing gasket (KU) 13. The PM 10 heat pipe section 12 for pairing with the shutter PZ 30 of the patented KM must have a rectangular shape in its output section.

PZ 30 according to the patented utility model is made of double-leaf (two-leaf) with leaflets 31 and 32 with partial overlapping by the free end of the leaf 32 of the free end of the leaf 31 in the closed position. Each of the flaps 31, 32 has a rectangular shape and is provided on the periphery with a profile sealing coating, respectively 311, 321 of heat-resistant rubber. Shutters for light weight and prevent sticking of coal on them are made of ultra high molecular weight polyethylene. RCS 40 is made with the arrangement of PG 50 on one side of the KM and a kinematic scheme that provides closing of the shutters 31 and 32 in the sequence necessary for sealing PZ 30. In this example of a constructive implementation, this is achieved by using each of the shutters 31 and 32 to rotate kinematically different lever-hinge subsystems PS 41 and PS 42, united by a common rotary axis (PO) 43. The PS 41 is connected to the closing first folding 31 PZ 30 and is made in the form of a single link short lever. PS 42 is attached to the sash 32 and is made in the form of a three-link lever with links 421, 422, 423 and three inter-link hinges 424, 425, 436. The delay in closing the sash 32 relative to the closing of the sash 31 is due to the additional time required for the sequential rotation these links one relative to the other on the indicated inter-link joints.

The work of the CM is as follows:

Coal from PM 10 accumulates on closed leaves 31 and 32, held in a closed position by counterbalanced cargoes PG 50, placed on the output end of the lever of the single-link subsystem PS 41 of the RCS 40 lever-hinge system. The amount of coal falling down during one opening of the leaves 31, 32 the shutter ПЗ 30, is regulated by the number and weight of the installed counterbalanced cargo ПГ 50. The tightness of the KM in the closed position is ensured by the presence of KU 13 in the place of coupling of the upper part of the body 20 KM with the lower part 12 of the heat of the PM 10, as well as the profile pack otnitelnym coated with heat-resistant rubber on the periphery of said flaps. Reliability of sealing is additionally ensured by the mutual overlapping of these wings.

Under the influence of the fuel column, the shutters 31, 32 open (Fig. 3, 4), and a portion of coal is supplied to the mill (not shown) through the housing 20 KM, smoothly passing into a standard pipeline. After this, the shutters 31 and 32 under the influence of the cargoes of the PG 50 and the lever-hinge system of the RCS 40 return to their original position in the sequence determined by the kinematics of this system described above.

Industrial applicability

Semi-synthetic double-petal flasher valve according to the patented utility model meets the condition of "industrial applicability". The essence of the technical solution is disclosed in the formula, description and figures of the drawing is sufficiently clear for understanding and industrial implementation by relevant specialists on the basis of the current level of technology in the field of heat power.

Claims (1)

Flasher valve installed on the outlet heat from the lump fuel supply hopper to the grinding mill of the boiler unit dust preparation system, comprising a body, the upper part of which is hermetically connected to the outlet part of the specified heat, placed inside it, and a flat shutter connected to the lever-hinge system of its rotation under the influence of counterweight, characterized in that the valve shutter is double-wing with a partial overlap of the free ends of the wings in the closed position, each valve flaps has a rectangular shape and is provided on the periphery of the sealing profile a heat-resistant rubber coating, and lever-system of its hinge pivot is provided with location cargo counterweight on one side of the valve and the kinematics ensuring closure flaps in the desired sealing shutter sequence.

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