Gas circulation pump with magnetic coupling

Abstract

A gas circulation pump with a magnetic coupling for pumping gases at pressures up to 28 bar and temperatures up to 220 °C, comprising: a driving part (1) comprising a rotor (2), a pumping part (3) enclosed by a housing (4) and comprising a driven element (5), a magnetic coupling configured to transmit torgue from the driving part (1) to the pumping part (3), wherein the pump further comprises at least one thermal insulation element (7) arranged around the magnetic coupling on its outer side for thermally shielding the magnetic coupling from the pumping part (3), and a thermal insulation jacket of thermal insulation boards (8) arranged around the housing (4) of the pumping part (3) for thermally shielding the pumping part (3).

Description

[0001] Gas circulation pump with magnetic coupling

[0002] Technical field

[0003] The invention relates to the field of fluid technology, specifically gas circulation pumps, and is intended for applications in environments with high temperatures (up to 220°C) and high pressures (up to 28 bar).

[0004] Background art

[0005] A conventional gas pump essentially consists of a pumping part and a driving part which are connected by a coupling that enables the transmission of torque from the driving part to the pumping part. This coupling may be mechanical or magnetic.

[0006] Current gas circulation pumps suitable for applications in environments with high temperatures (up to 220°C) and high pressures (up to 28 bar) use mechanical couplings. However, these require mechanical seals which are maintenance-intensive and have low reliability, because individual components wear rapidly at high pressures and temperatures, and gas leakage subsequently occurs.

[0007] Gas pumps using magnetic couplings are currently used only for applications that do not require high pressures and temperatures. At high pressures and temperatures, a loss of magnetic properties of ferromagnetic materials occurs. At high pressures and temperatures, mechanical deformation of the coupling housing or bearings may also occur, thereby weakening the transmission of torque.

[0008] On the other hand, the use of magnetic couplings has certain advantages over mechanical couplings, such as the fact that the drive section is hermetically separated from the pumping section without the need for a mechanical seal between the individual parts. Eliminating mechanical seals reduces maintenance requirements and increases the service life of the pump. The magnetic coupling minimises energy losses, thereby increasing the overall efficiency of the system.The aim of this invention is to provide a gas circulation pump with a magnetic coupling suitable for pumping gases at high pressures and temperatures.

[0009] Summary of the invention

[0010] A gas circulation pump with a magnetic coupling suitable for pumping gases at high pressures and temperatures, according to the present invention, comprises:

[0011] - a driving part comprising a rotor,

[0012] - a pumping part enclosed by a housing and comprising a driven element, - a magnetic coupling for transmitting torque from the driving part to the pumping part, wherein the magnetic coupling comprises:

[0013] o a first part rigidly connected to the rotor of the driving part and comprising a first magnetic surface, and

[0014] o a second part rigidly connected to the driven element of the pumping part and comprising a second magnetic surface,

[0015] wherein the first and second magnetic surfaces are configured for mutual magnetic coupling,

[0016] wherein the pump further comprises:

[0017] - a thermal insulation element (casing) arranged around the magnetic coupling on its outer side for thermally shielding the magnetic coupling from the pumping part, and

[0018] a thermal insulation jacket made of thermal insulation boards arranged around the pump section cover to provide thermal shielding of the pump section.

[0019] High temperature is understood to mean a temperature from 100 °C to 220 °C, and high pressure is understood to mean a pressure from 10 bar to 28 bar, which corresponds to a pressure from 1 to 2.8 MPa.

[0020] The thermal insulation element and the thermal insulation jacket are made of thermal insulation boards and together form a pump shield which enables the use of a magnetic coupling also for pumps intended for pumping gases under high pressure and temperature.According to a preferred embodiment, the thermal insulation element and the thermal insulation boards have a thickness of 15 to 30 mm, preferably 20 to 25 mm. The thermal insulation element and the thermal insulation boards are preferably pressed thermal insulation boards of ceramic fibres, i.e. ceramic insulation panels.

[0021] The pumping part is the part that directly interacts with the gaseous medium and is designed from materials resistant to high temperatures and pressures, such as stainless steel and ceramics.

[0022] The driving part represents the drive unit, such as an AC, DC or BLDC (brushless direct-current) electric motor, stepper motors, servomotors, or another power source providing torque.

[0023] The pump according to the present invention comprises a magnetic coupling which transmits torque from the driving part to the pumping part by means of a magnetic field, thereby eliminating the need for a mechanical connection. The magnetic coupling hermetically separates the pumping part from the driving part, thereby preventing gas leakage and seal wear. Eliminating mechanical seals reduces maintenance requirements and increases the service life of the pump. The magnetic coupling minimises energy losses, thereby increasing the overall efficiency of the system.

[0024] The pump according to the present invention is capable of operating efficiently at temperatures up to 220 °C and pressures up to 28 bar, due to the use of durable materials and an optimised design.

[0025] The pump housing is made of stainless material which is known for its high temperature resistance (~300-800 °C) and corrosion resistance. The rotating part (the driven element), i.e. the impeller, is made of an aluminium alloy, which has lower temperature resistance compared to stainless steel but is advantageous due to its low density and good thermal conductivity (structural alloys: ~ 200-250 °C). For rotationalmovement, special bushings made of composite materials such as carbon and ceramic composites are used, which can have thermal resistance up to 1000 °C and more, depending on the specific material properties.

[0026] Brief description of the drawings

[0027] The attached figure 1 shows a sectional view of a magnetic circulation pump.

[0028] Detailed description

[0029] A gas circulation pump with a magnetic coupling for pumping gases at pressures up to 28 bar and temperatures up to 220 °C, the cross-section of which is shown in the attached figure, comprises a driving part 1, which is a motor comprising a rotor 2. It further comprises a pumping part 3, enclosed by a housing 4, and comprising a driven element 5. Between the driving part 1 and the pumping part 3, a magnetic coupling is arranged, configured to transmit torque from the driving part 1 to the pumping part 3. The magnetic coupling comprises a first part 6a rigidly connected to the rotor 2 of the driving part 1 and comprising a first magnetic surface, and a second part 6b rigidly connected to the driven element 5 of the pumping part 3 and comprising a second magnetic surface. The first and second magnetic surfaces are configured for mutual magnetic coupling. The gas circulation pump further comprises a thermal insulation element 7 arranged around the magnetic coupling on its outer side for thermally shielding the magnetic coupling from the pumping part 3, and a thermal insulation jacket of thermal insulation boards 8 arranged around the housing 4 of the pumping part 3 for thermally shielding the pumping part 3.

Claims

Claims1. A gas circulation pump with a magnetic coupling for pumping gases at pressures from 1 to 2.8 MPa and temperatures from 100 to 220 °C, comprising:- a driving part (1) comprising a rotor (2),- a pumping part (3) enclosed by a housing (4) and comprising a driven element (5),- a magnetic coupling for transmitting torque from the driving part (1) to the pumping part(3), wherein the magnetic coupling comprises:o a first part (6a) rigidly connected to the rotor (2) of the driving part (1) and comprising a first magnetic surface, ando a second part (6b) rigidly connected to the driven element (5) of the pumping part (3) and comprising a second magnetic surface, wherein the first and second magnetic surfaces are configured for mutual magnetic coupling,characterised in that the pump further comprises:- at least one thermal insulation element (7) arranged around the magnetic coupling on its outer side for thermally shielding the magnetic coupling from the pumping part (3), anda thermal insulation jacket made of thermal insulation boards (8) arranged around the housing (4) of the pumping part (3) for thermally shielding the pumping part (3).

2. The gas circulation pump with a magnetic coupling according to claim 1, characterised in that the thermal insulation element (7) and the thermal insulation boards (8) have a thickness of 15 to 30 mm, preferably 20 to 25 mm.

3. The gas circulation pump with a magnetic coupling according to claim 1 or 2, characterised in that the thermal insulation boards (8) and / or the thermal insulation element (7) are ceramic insulation panels.

4. The gas circulation pump with a magnetic coupling according to claim 1, 2 or 3, characterised in that the pumping part (3) is made of stainless steel or ceramics.

5. The gas circulation pump with a magnetic coupling according to claim 1, 2 or 3, characterised in that the driving part (1) is a drive unit, preferably an AC electric motor, a DC electric motor, a brushless DC electric motor, a stepper motor or a servomotor.

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