UA152042U - Device for dosing and feeding bulk materials into the transporting pneumatic system - Google Patents

Abstract

The device for dosing and supplying bulk materials to the transporting pneumatic system contains a body equipped with loading and unloading openings, inside which a dosing body is placed. The dosing body is made in the form of a rotor, which interacts with four dosing elements placed radially relative to the rotor and adjacent to each other by means of an elastic-elastic connection. Each dosing element is equipped with a receiving cavity made to be isolated by the inner surface of the housing during rotor rotation.

Description

A useful model belongs to power engineering and can be used for metered supply of burnt products of thermal power plants, which have a high temperature during unloading and are transported to the place of disposal or storage with the help of a transporting working body, as such compressed air is used.

A useful model can be used if it is necessary to prevent the loss of compressed air when loading bulk product being transported, obtained as a result of fuel combustion at thermal power plants.

The design of the unloading device is known, which includes a body with loading and unloading nozzles, two end caps, a bladed perforated rotor consisting of a hollow perforated shaft, on which blades with conical holes are fixed. The movable air connection consists of a body, flange, stuffing box. The drive of the device consists of a gear motor. The drive is hermetically sealed from foreign impurities. The device is attached to the flange of the hopper housing outlet by the flange of the housing (Patent VSH Mo 2526403 for the invention).

The disadvantage of the known device is its low performance, which is explained by the need to transport a low-density product in a suspended state. The use of the burnt ash of thermal power plants as a product to be transported is not possible due to the wide range of particle size composition in which there are relatively large fractions compared to the flour that is transported in the known device.

The design of a continuous feeder for bulk material is known, which is equipped with a cylindrical body on the outside with a conical cavity on the inside. Inside the case, two conical drums connected to each other are rigidly mounted on the shaft, on the surface of which dosing holes are made, located at the same distance from each other in circumference and length. The cylindrical body has an inlet channel on top for receiving loose materials, and an outlet channel for unloading loose materials from the feeder is made on the bottom. Conical drums are centered internally by a bearing unit and secured on both ends by sealing flanges with seals. A cylindrical driving variable gear is rigidly fixed to the shaft at one end to transmit the rotation of the shaft from the drive. On the surface of the conical drums, metering holes are made, located at an equal distance from each other

From a circle and in several rows along the length. On the shaft in front of the cylindrical leading variable gear there is a thrust sleeve (Patent VI Mo 2708780 for the invention).

The disadvantage of the known device is that, like the similar device described above, it does not provide a high performance of bulk medium dosing, which is especially necessary for transporting ash of powerful thermal power plants. A significant drawback of the known device is that its operation requires a stable high-quality granulometric composition, which is impossible for the transportation of ash from thermal power plants without preliminary preparation and sorting.

The closest analogue is the unloading device, which consists of a body and a shell pressed into it. A rotor with pockets rotates inside the housing. There is a certain gap between the rotor and the shell. When the rotor is turned 90", the transported product is pushed out of the pockets by the alkaline solution from the high-pressure windows. Cams with a variable diameter are used to compensate for the gap in the feeder.

During the operation of the feeder, when a gap is formed between the housing shell and the rotating rotor, cams are used to compensate for it from the side of maximum wear. The cam on half of the circle has a constant diameter, and in the second half the diameter gradually increases and exceeds the diameter of the second half of the cam. Thus, the diameter difference is used to compensate for the gap in the feeder. Compensation of the gap in the feeder is carried out due to the periodic rotation of the cam (Patent VI Mo 1612017 for the invention).

The disadvantage of the known device is that its design does not ensure the necessary tightness of the system, and therefore the specified feeder cannot be used for pneumatic transportation of products. The use of movable cams as wear compensators complicates the design of the device, which reduces its operational resource and makes it possible for unscheduled or emergency repairs to occur.

The implementation of the device is possible for the transportation of a large fractional product using hydraulic delivery to the place of processing or storage.

The basis of the useful model is the task of improving the design of the dosing device and supplying bulk materials to the transporting pneumatic system due to: - implementation of the dosing body in the form of a rotor with radially located dosing elements; bo - provision of an elastic connection between the rotor and dosing elements;

- placement of dosing elements adjacent to each other with side surfaces; - execution of dosing elements equipped with open receiving cavities; - isolation of the containers of the dosing elements by the inner surface of the device body.

The task is solved by the fact that the device for dosing and feeding loose materials into the transporting pneumatic system, which contains a body equipped with loading and unloading holes, inside which the dosing body is placed, according to the useful model, the dosing body is made in the form of a rotor, which interacts with the help of elastic flexible connection with four dosing elements, located radially relative to the rotor and adjacent to each other side surfaces, and each dosing element is provided with a receiving cavity, made with the possibility of isolation by the inner surface of the case when the rotor rotates.

The technical result of the implementation of the useful model is that: - high tightness of the transport system is ensured after loading the bulk mixture and its movement to the place of disposal or storage; - the design of the device ensures the minimization of the time between loading and unloading cycles of the bulk mixture, which makes maximum use of the useful capacity of the pipeline; - depending on the design parameters of the dosing device, high productivity of transportation of bulk fuel combustion products of thermal power plants is ensured; - the device has a significant operational resource, which leads to high repairability; - the device has a wide range of applications in various branches of industry where it is necessary to transport unbound loose mass using pneumatic transport; - the use of an elastic-flexible connection between the rotor and the transport containers allows to prevent the leakage of compressed air from the main line of the pneumatic line.

The claimed useful model is illustrated by a block diagram of a device for dosing and supplying bulk materials to the transporting pneumatic system.

The device for dosing and feeding loose materials into the transporting pneumatic system includes a body 3, which is equipped with a loading hole 1, connected to the receiving hopper 2 of the boiler of the thermal power plant.

З Inside the case З there are four dosing elements 4, 5, 6, 7, which are connected to the rotor 8 by means of an elastic connection 9.

The receiving containers (not shown in the diagram) inside the dosing elements 4, 5, 6, 7 are isolated by the inner cylindrical surface of the housing 3.

The lower part of the case C is equipped with an unloading hole 10. The unloading hole 10 is connected to a pneumoduct 11 for transporting the bulk product to the place of storage or disposal.

The device works as follows.

As a result of the operation of power plants of thermal power plants, as a rule, fine fractional ash is formed, which is a loose product. As research has shown, ash is composed or used as a multi-component raw material for various industries.

The formed ash enters the receiving hopper 2. From the receiving hopper 2, the ash under the action of gravity or with the help of a feeding device enters the loading hole 1 of the device.

From the loading hole 1, ash enters one of the dosing elements 4, 5, 6, 7 of the dosing body located inside the cylindrical cavity of the housing 3.

Each dosing element 4, 5, 6, 7 receiving capacity.

The peculiarity of the device is that inside the cylindrical cavity of the body C there are four dosing elements 4, 5, 6, 7, which adjoin each other with their side parts.

This arrangement allows you to fill the internal space of the dosing organ as completely as possible and prevent the leakage of main compressed air.

Supply of bulk product is carried out continuously due to the rotation of the dosing body, therefore, air leaks are inevitable due to leaks that occur between the frictional surfaces of the housings of the dosing elements and the inner cylindrical surface of the device. These leaks increase during the operation of the device for transporting the bulk product.

The solution to the task of preventing possible air leaks during the operation of the device is to provide an elastic connection 9 between the dosing elements 4, 5, 6, 7 and the rotor 8.

Research has established that the use of an elastic connection 9 between the dosing elements 4, 5, 6, 7 and the rotor 8 in the form of springs or elastic plates allows for constant contact between the rubbing surfaces. Due to the elastic connection 9, there is a constant compensation of the wear of the rubbing surfaces and a constant force of contact between the interacting parts.

The operation of the device is ensured by the rotation of the rotor 8, which interacts inside the cylindrical cavity of the body with the dosing elements 4, 5, 6, 7 with open receiving containers.

For transportation, the bulk fuel combustion product of thermal power plants from the receiving hopper 2 under the action of gravity or a suitable feeder enters the loading hole 1 of the device. From the loading opening 1, the bulk product enters the open receiving container of one of the dosing elements 4, 5, 6, 7. After filling the cavity of the receiving container of one of the dosing elements 4, 5, 6, 7, due to the rotation of the rotor 8, the dosing cavity is moved inside the body З device and overlaps with its inner cylindrical surface. After the displacement of one of the loaded dosing elements 4, 5, 6, 7, the next dosing element enters the loading hole 1, which similarly enters under loading and is filled with a loose mixture.

Dosing elements 4, 5, 6, 7 filled with a bulk product, moving in a circle, one by one reach the unloading hole 10. Since the rotation of the rotor 8 has a sufficient speed, due to centrifugal forces, the bulk product is quickly and completely removed from the cavities of the dosing elements 4, 5, 6, 7 in the unloading hole 10. From the unloading hole 10, the bulk product enters the transporting pneumatic system 11 for moving to the place of storage or disposal.

Claims (1)

FORMULA OF THE USEFUL MODEL A device for dosing and feeding bulk materials into the transporting pneumatic system, containing a body equipped with loading and unloading holes, inside which a dosing body is placed, which is distinguished by the fact that the dosing body is made in the form of a rotor, which interacts with the help of an elastic-flexible connection connection with four dosing elements, located radially relative to the rotor and with side surfaces adjacent to each other, and each dosing element is provided with a receiving cavity, made with the possibility of isolation by the inner surface of the housing when the rotor rotates.