RU92489U1 - TWO SCREW PUMP FOR PUMPING HIGH VISCOUS MULTI-PHASE MEDIA - Google Patents

Abstract

A twin-screw pump for pumping highly viscous multiphase media, containing a detachable body with a flow part, in the cylindrical bores of which, with the formation of suction and discharge cavities, the left and right screws are interconnected, the twin-screw part of which is installed in the suction cavity, the cycloid part is in the discharge cavity, kinematically interconnected through the drive and driven shafts and through the synchronizing gears, the suction and discharge pipes, elements that provide durable spacing and tightness of the flowing part, characterized in that it has a block design, the screws have special engagement in the suction chamber and cycloid engagement in the discharge chamber, while the ends of the screws are placed in the stuffing box, in which the sealing rings, as well as the drive, driven shafts and plain bearings placed in a bearing assembly, a synchronous drive assembly, in which synchronizing gears and an elastic coupling, a gear motor, and a discharge chamber cover are installed on the drive and driven shafts and the mounting plate of the gearmotor are pulled together with studs.

Description

The utility model relates to the field of engineering, in particular to screw pumps, and can be used in the food and cosmetic industry for pumping highly viscous multiphase media, such as minced meat or bone gruel.

A known design of a multiphase screw pump for pumping gas-liquid media, comprising a housing with inlet and outlet nozzles placed in the housing bores on the bearing bearings by the driving and driven rotors, on the shafts of which are installed synchronizing gears placed in a separate chamber with a lubricating fluid (patent RU 2346186, IPC F04C 2/16, 29/02; 2006).

The known design can be used for pumping gas-liquid media, and is not applicable for more viscous media, the pump intensively mixes (foams) and grinds the pumped medium, which is unacceptable when pumping a number of products and substances, both in the food and cosmetic industries.

The closest in technical essence and result is a screw pump according to the invention RU 2095630, IPC F04C 2/16, s. 03/07/1995, op. 11/10/1997 - a prototype. The prototype pump is a casing with a cage installed in it with two cylindrical bores in which single-lead screw drive and driven rotors are installed tightly combined with each other. On screw rotors, ridges and depressions are made within the cage, and screws are located in the suction cavity. The drive of the driving rotor is carried out remotely through the transmission shaft, and the driven through the block of synchronizing gears.

The pump is designed for pumping highly viscous liquids. During operation, the pump must be immersed in the pumped liquid, while the entire suction cavity is filled with liquid. The drive rotor is driven through a remote drive, which drives the driven rotor into synchronous rotation through the gears. Rotating rotor screws with their crests capture the liquid and feed it to the lower edge of the holder, where the liquid fills the hollows of the rotors. When the ridges of the rotors are closed, a certain volume of liquid is cut off and fed along the rotor into the injection cavity.

The known pump in the discharge part has a design of rotors with sharp edges of the ridges, which are capable of grinding a medium inhomogeneous in structure, which is not permissible for pumping some multiphase media. Not in all cases it is acceptable to immerse the pump in a transported medium, in particular when transporting food semi-finished products.

The task underlying the utility model is to create a compact, reliable and multi-functional pump for pumping highly viscous multiphase media without mixing and grinding, designed for use in the food and cosmetic industry.

The problem is solved in the proposed design twin-screw pump block design.

The essence of the utility model is illustrated by drawings:

- Figure 1. - General form.;

- Figure 2. - Front view with the purpose of sections .;

- Figure 3. - Section AA. The main elements of the pump .;

- Figure 4. - Section BB. Cycloidal engagement of screws in the discharge chamber .;

- Figure 5. - Section B-B. Special screw engagement in the suction chamber.

The pump consists of blocks: forcing chamber 1 (Figure 1); suction chamber 2; stuffing box 3; bearing assembly 4; node synchronous drive 5; gear motor 6; bases 7.

The mounting plate of the motor gearbox 29 (Figure 3), the housing of the synchronous drive assembly 30, the housing of the bearing assembly 31, the housing of the stuffing box 32, the housing of the suction chamber 33, the housing of the discharge chamber 34 and the cover of the discharge chamber 35 are fixed from the lateral displacements by pins 36 and tightened studs 38 form a one-piece structure in which the working elements of the pump are located. The flow part of the pump is two combined cylinders and is formed by the inner surfaces of the cover of the discharge chamber 35, the case of the discharge chamber 34, the housing of the suction chamber 33 and the end surface of the housing of the stuffing box 32. The tightness of the flow part is ensured by the use of gaskets 37. The suction chamber has a rectangular suction nozzle with threaded holes for flange mounting, the cover of the discharge chamber has a discharge pipe with pipe threads d. The main working elements of the pump are two screws tightly adjacent to each other: screw left 21 and screw right 22. Their screw part is located in the flow part of the pump, and the shanks in the stuffing box.

The screws in the suction chamber are in the form of double-auger screws and form a special engagement. At the junction of the suction chamber with the injection chamber, the screws from the screws smoothly go into the form in which they form a cycloid engagement (Figure 4).

The stuffing box 3 (Figure 1) is designed to prevent the penetration of pumping products into the drive mechanism. The sealing elements of the stuffing box are sealing rings 23 and 24 for the left and right screws, respectively (Figure 3). The tightness of the o-rings to the shanks of the screws is ensured by nuts 25 and 26. The nuts 25 and 26 are secured against unscrewing with the lock nuts 27 and 28. The bearing assembly 4 consists of a housing 31, in the bores of which the drive shaft 11 is mounted on the bearings 17, 18 and on the bearings 19, 20, a driven shaft 16 is installed. Synchronous gears 13 and 14 are installed at the ends of the drive shaft 11 and the driven shaft 16 in the case of the synchronous drive assembly 30, an elastic coupling 9 is installed that transmits torque from the output shaft of the gear motor 6 to the drive shaft 11. Moto The p-reducer is bolted to the plate 29. The prefabricated structure of blocks 1, 2, 3, 4, 5, 6 is bolted to the base 7.

The twin-screw pump operates as follows.

The pumped medium is supplied to the nozzle of the suction chamber 2. The torque from the output shaft of the gear motor is transmitted through the keys 8, 10 (Fig. 3) and the elastic coupling 9 to the drive shaft 11. The torque to the driven shaft 16 is transmitted through the keys 12, 15 and synchronizing gears 13 and 14. The drive shaft 11 and the driven shaft 16 rotate synchronously and counterclockwise. The drive shaft 11 and the driven shaft 16 at the output ends have grooves characteristic for fork engagement, in which the ends of the screws of the left 21 and right 22 are fixed. Torques transmitted from the drive shaft 11 to the left screw 21 and from the driven shaft 16 to the right screw 22, create counter-rotation of the screws. The transported medium that fills the troughs of the twin-screw screws, when they rotate from the suction chamber, enters the discharge chamber and fills the troughs of the cycloidal engagement of the screws. When the ridges of the cycloid profile of the screws are closed, part of the transported medium is cut off. Since the screw feed of the screws of the transported medium is greater than the pump capacity, a smooth and constant support is created at the smooth transition of the screws into cycloidal gearing regardless of the viscosity of the transported medium, which ensures good filling of the hollows of the screws rotating in the cycloidal gearing in the discharge chamber. The cross-sections of the screws in cycloidal engagement are the area limited by the given contours of the mutually mating arcs. Between the screws at such their cross sections and synchronous counter rotation, regardless of the angle of rotation, there is always a tight contact. It is this construction of the structure that prevents the transported medium from penetrating between the screws perpendicular to the axes of their rotation, which eliminates the mixing and grinding of the medium when it is pumped by a pump.

Claims (1)

A twin-screw pump for pumping highly viscous multiphase media, containing a detachable body with a flow part, in the cylindrical bores of which, with the formation of suction and discharge cavities, the left and right screws are interconnected, the twin-screw part of which is installed in the suction cavity, the cycloid part is in the discharge cavity, kinematically interconnected through the drive and driven shafts and through the synchronizing gears, the suction and discharge nozzles, elements that provide durable spacing and tightness of the flowing part, characterized in that it has a block design, the screws have special engagement in the suction chamber and cycloid engagement in the discharge chamber, while the ends of the screws are placed in the stuffing box, in which the sealing rings are installed, as well as the drive, driven shafts and plain bearings placed in a bearing assembly, a synchronous drive assembly, in which synchronizing gears and an elastic coupling, a gear motor, and a discharge chamber cover are installed on the drive and driven shafts and the mounting plate of the gearmotor are pulled together with studs.