RU201830U1 - Fan - Google Patents

Abstract

The utility model relates to devices used in gas cleaning and aspiration systems for transporting air, aerosols and gases in various chemical-technological processes, and can be used in chemical laboratories, galvanic lines, non-ferrous metallurgy enterprises and other enterprises where media are present. causing increased corrosion. To achieve the specified technical result, a fan is proposed, consisting of a fan housing (coiled tubing), an electric motor mounted on a frame, an impeller mounted on an electric motor shaft, a condensate drain pipe, and the fan casing and the impeller are made of sheet thermoplastics with a thickness of 3 to 20 mm. As sheet thermoplastics, polypropylene (homopolymer and its copolymers), polyethylene, polyvinyl chloride (PVC), chlorinated polyvinyl chloride (PVC-X), polyvinylidene fluoride (PVDF, PVDF), ethylene chlorotrifluoroethylene, fluoroplastics and other sheet thicknesses from thermoplastics 3 to 20 mm.

Description

The utility model relates to devices used in gas cleaning and aspiration systems for transporting air, aerosols and gases in various chemical-technological processes, and can be used in chemical laboratories, galvanic lines, non-ferrous metallurgy enterprises and other enterprises where there are media, causing increased corrosion.

A beet pump is known from the current state of the art, patent RU No. 2702772, published on 11.10.2019. Beet pump containing a housing with suction and delivery nozzles and an impeller mounted on the shaft, consisting of front and rear disks in the form of cones and curved blades reinforced between them, on the inner surface of the casing and on the surfaces of the impeller there are covers made of elastic material, while the curved blade the impeller is made of a composite material, which includes a rubber-fabric shell and a prefabricated frame containing a main section, which is a rigid structure and a shank, which is a flexible structure, and the rubber-fabric shell is evenly distributed throughout the entire volume of the prefabricated frame, and on the shank over the surface of the rubber-fabric shell covered with elastic material, curved grooves are made, converging to the exit of the curved blade, while curved grooves are made on the inner surface of the discharge pipe, the tangent of which has a clockwise direction, and the tangent of the curved grooves on the shank along the surface of the rubber-fabric shell has a counterclockwise direction, and the impeller shaft is equipped with a drive with a speed regulator, and the speed regulator is connected to a pressure regulator connected to a pressure sensor located in the discharge pipe, while the pressure regulator contains interconnected comparison and task units, electronic and magnetic amplifiers and a nonlinear feedback unit, in addition, the rotation speed controller is made in the form of a block of electromagnetic powder clutches, characterized in that the suction pipe of the beet pump is made of bimetal, and the material is bimetal from the side of the moving stream, transporting beets, has a coefficient of thermal conductivity 2.0-2.5 times higher than the coefficient of thermal conductivity of the material from the ambient air side.

The disadvantage of the described technical solution is the impossibility of using the device as an industrial radial fan when operated as part of ducted and channelless ventilation systems.

A universal radial fan is known from the state of the art, patent RU No. 90539. A universal radial fan including an inlet manifold, an impeller and a motor located in a housing containing a first end wall with an inlet communicated with the inlet manifold and a second end wall with an externally attached motor, at least two opposite longitudinal walls located between end walls, and at least one outlet pipe for discharging the flow from the body, and the outlet pipe is located at an angle α to the plane of rotation of the impeller and communicated with the opening in the body located between the longitudinal walls, while the impeller is made with a carrier associated with the engine , and cover, having an inlet, disks and blades curved backward in the direction of rotation, located between the carrier and cover disks, having outer diameters D1 of the carrier and D2 of the cover disks protruding beyond the outer edges of the blades, with the formation of an ejection channel between the annular walls, while work blade the wheels are made with a beveled outer edge located in such a way that the diameter D3 of the location of the point of abutment of the outer edge of the blades to the carrier disk refers to the diameter D4 of the location of the point of abutment of the outer edge of the blades to the cover disk as 0.91≤D3: D4≤0.98, and the outer diameter D1 of the bearing disc is at least 0.98 times less than the outer diameter D2 of the covering disc, while the diameter D2 of the covering disc is not more than 0.25D4 greater than the diameter D4 of the point of abutment of the outer edge of the blades.

The disadvantage of the above-described technical solution is the short service life of the device when working in an aggressive environment, low corrosion resistance.

The closest technical solution is the BP 80-75 series fan, described in the information source: https://ventilator.spb.ru/catalog/obshcheobmennye-ventilyatory/radialnye/radialnye_ventilyatory_vr_80-75/. This fan is designed as a monoblock design. On the welded metal frame there is a spiral casing “snail” with two branch pipes, on the flanges of which there are holes for mounting equipment to the air ducts of the ventilation network. The body has the ability to rotate angularly around the frame, multiples of 45 °, which allows you to set the outlet at the desired angle to the horizon. Inside the housing there is an impeller (impeller) with twelve blades bent in the opposite direction to rotation. In the direction of its rotation, right and left radial fans are distinguished. To fasten the frame to the base, there are holes for anchoring in its lower supporting part (it is recommended to use additional spring vibration dampers during installation). The BP 80-75 low pressure radial fan is to be used as part of duct and ductless ventilation systems. They can be connected to a duct system, or installed on the roof or walls of a building. Working environment - air with a concentration of fine dust and suspended particles up to 100 mg / m3. Permissible air temperature - up to + 80 ° С. The working environment must be free from sticky, explosive and fibrous inclusions.

The disadvantage of the prototype is the short service life of the device when operating in an aggressive environment, low corrosion resistance due to the design of the device body made of metallic materials.

The task of the proposed utility model is to eliminate the above disadvantages.

The technical result of the claimed utility model is an increase in the service life of the device when operating in aggressive environments while maintaining mechanical stability, the acquisition of the device properties of immunity to aggressive environments, no susceptibility to corrosion, the ability to move gases at elevated temperatures (up to 100 degrees Celsius).

To achieve the specified technical result, a fan is proposed, consisting of a fan housing (coiled tubing), an electric motor mounted on a frame, an impeller mounted on an electric motor shaft, a condensate drain pipe, and the fan casing and the impeller are made of sheet thermoplastics with a thickness of 3 to 20 mm. As sheet thermoplastics can be used polypropylene (homopolymer and copolymers), polyethylene, polyvinyl chloride (PVC), chlorinated polyvinyl chloride (PVC-X), polyvinylidene fluoride (PVDF, PVDF), ethylene chlorotrifluoroethylene, fluoroplastic and other sheet plastic materials that meet the thickness criteria 3 to 20 mm.

The essence of the invention is illustrated by drawings. Figure 1 shows a general view of an industrial radial fan, figure 2 shows a side view of an industrial radial fan, where:

1- building;

2- electric motor;

3- frame;

4- impeller;

5- fan exhaust.

The fan consists of a spiral-rotating casing 1, which can be made as a right-handed or left-handed casing. A frame 3 is installed from the outer part of the body, on which the fan motor 2 is fixed, and the fan impeller 4 is installed on the electric motor shaft. The impeller (impeller) is a device of n-th number of blades, the blades of which can be bent both forward and back. All working parts of the fan can be treated with a polymer coating in order to reduce wear when working in aggressive environments. The place of the fan 4 exhaust and connection to the air duct can be equipped with a flexible insert (not shown in the figures) in order to prevent the transmission of vibration from the fan to the air duct and to further seal the ventilation joints and joints. Flexible insert can be made in the form of round or rectangular section. Vibration isolators (not shown in the figures) of the fan are attached to the frame with fasteners. The condensate drain is installed at the lowest point of the housing. The fan casing is manufactured by extrusion welding of sheet thermoplastics or using bending and docking machines for plastic welding. The fan casing can be made of different thickness, as a rule, the side wall is thinner, and the front and rear walls are thicker. The fan casing can be covered with PVC fabric for additional reinforcement. In the event of an accident, fragments of the impeller will not fly apart in different directions. The fan casing and the impeller can be made from the same material or from different materials that fall under the group of sheet thermoplastics.

The fan is used in the following way: the fan is usually delivered to the installation site in an assembled state. Assembled fans can be installed on foundations, metal brackets or platforms. The choice of a structure is determined by the geological and hydrogeological conditions of the construction site, the nature and purpose of the structure to be erected, and the values of the existing loads. When installing fans on spring or rubber vibration isolators, it is necessary to ensure that the load is evenly distributed, while the vibration isolators must have the same draft. When aligning the installed fan, it is necessary to ensure that its shaft is located strictly horizontally, and the walls of the housing are not distorted.

Example # 1:

Industrial radial fan consisting of a right-hand rotation casing made of polypropylene sheet material, a copolymer block 3 mm thick, an impeller made of polypropylene sheet material, a copolymer block 3 mm thick, an electric motor mounted on a frame, an impeller mounted on an electric motor shaft, flexible inserts of round and rectangular cross-section and vibration isolators fixed to the frame, a branch pipe for draining condensate. This fan is small in size and can be used as an exhaust fan for chemical fume hoods in laboratory or experimental plants. At the same time, the service life of the fan significantly exceeds the service life of the fan selected as a prototype and reaches 30-50 years.

Example # 2:

Industrial radial fan, consisting of a right-hand rotation casing made of polyethylene sheet (HDPE) with 11.5 mm thick elements, an electric motor mounted on a frame, an impeller mounted on an electric motor shaft, flexible inserts at the intake and exhaust, vibration isolators fixed on frame, condensate drain pipe, and the fan impeller is made of polyethylene (HDPE) with 10 mm thick elements. This fan can be made in different sizes with suction diameter from 110mm to 1600mm. At the same time, the useful life of the fan reaches up to 50 years when operated at temperatures from -50 to +80 degrees Celsius.

Example # 3:

Industrial radial fan, consisting of a left-hand rotation casing made of PVC sheet with a thickness of 20 mm, an electric motor mounted on the frame, an impeller mounted on the electric motor shaft, vibration isolators fixed on the frame, a condensate drain pipe, and a fan impeller made of polyethylene sheet (HDPE) 20 mm thick. In this case, the fan casing is made of different thickness. This fan can be made in different sizes with suction diameter from 110mm to 1600mm. At the same time, the useful life of the fan can reach up to 50 years when operated at temperatures from 0 to +60 degrees Celsius.

Example No. 4

A fan consisting of a right-hand rotation casing made of polypropylene sheet material, a copolymer block 1.5 mm thick, an electric motor mounted on a frame, an impeller mounted on an electric motor shaft, a flexible square section, a condensate drain pipe, and the fan impeller is made polypropylene copolymer block 2 mm thick. The use of a fan made of materials with such parameters is not possible due to the fact that the thickness of the fan casing is insufficient both to ensure chemical resistance and mechanical strength due to vibration and pressure generated by the fan impeller and the general loads experienced by the fan. The fan wheel is a fan element that experiences maximum loads due to rotation, the load on the blades due to air movement and chemical attack, a thickness of 2 mm is not enough to ensure the mechanical strength of the impeller.

Example No. 5

A fan consisting of a right-hand rotation casing made of polypropylene sheet material, a copolymer block 25 mm thick, an electric motor mounted on a frame, an impeller mounted on an electric motor shaft, a flexible square section, a condensate drain pipe, and a fan impeller made of polypropylene copolymer block 25 mm thick. The use of a fan made of materials with such parameters is not advisable, since it violates a number of norms for welding sheet thermoplastics, including the radii of cold bending of sheet thermoplastics, even taking into account the maximum dimensions of the fans. Also, increased material thickness will change the aerodynamic characteristics of the fan.

To achieve the specified in the present application for a utility model, the whole set of features of an independent claim of a utility model is important, namely: a fan consisting of a fan housing, an electric motor mounted on a frame, an impeller mounted on an electric motor shaft, a condensate drain pipe, and the housing the fan and impeller are made of sheet thermoplastics with a thickness of 3 to 20 mm. The thickness of thermoplastic sheets is directly important for increasing the service life in corrosive environments, taking into account the preservation of the mechanical resistance of the device, since the thickness of thermoplastics, from which the casing and impeller of the fan are made, is directly related to the service life of the fan, since during the operation of the fan, part of the material from of which the device is made, which is in contact with the medium, changes its structure, which is why the thickness of the material should be selected not only for mechanical strength, but also with the calculation of the expected service life of the device. In addition, the use of such a material as sheet thermoplastics is also directly related to the claimed technical result, since sheet thermoplastics are more resistant to aggressive environments and temperature changes, have high chemical resistance, good resistance to abrasion and corrosion cracking. Under normal conditions, thermoplastic sheets are resistant to organic solvents such as alcohols, esters and ketones, as well as acids, even at high concentrations and temperatures above 60 ° C. Thermoplastic sheets are resistant to mineral and vegetable oils even after prolonged exposure. Only strong oxidants can have a noticeable effect on sheet thermoplastics: chlorosulfonic acid, sulfuric (oleum) and concentrated nitric acid, chromium mixture.

No technical solutions have been identified that coincide with the set of essential features of the claimed utility model, which makes it possible to conclude that the claimed utility model complies with such a condition of patentability as "novelty".

Claims (7)

1. A fan consisting of a fan casing, an electric motor mounted on a frame, an impeller mounted on the electric motor shaft, a condensate drain pipe, characterized in that the fan casing and the impeller are made of sheet thermoplastics with a thickness of 3 to 20 mm. 2. The fan according to claim 1, characterized in that it contains at least one flexible insert. 3. The fan according to claim 1, characterized in that vibration isolators are mounted on the frame. 4. The fan according to claim 1, characterized in that the fan casing is made of different thickness. 5. The fan according to claim 1, characterized in that the fan impeller is made of different thickness. 6. The fan according to claim 1, characterized in that the fan casing is covered with PVC fabric. 7. The fan according to claim 1, characterized in that the working parts of the fan are treated with a polymer coating.

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