SU1555536A1 - Sealed pump - Google Patents

Abstract

The purpose of the invention is to save energy, increase pump reliability and heating efficiency of the pumped medium, reducing weight, size and cost. The hermetic pump contains an electromagnetic clutch 6 with an excitation coil 7, a hermetic metal screen 11, the latter being made of metal, and the drive of the coil 7 is made of an alloy with low and high electrical resistances, respectively. When the pump is operating, the working medium washes the screen 11, effectively cooling it and the excitation coil 7, which, by increasing the reliability of the pump by cooling the heat-loaded elements, also increases the efficiency of heating the working medium. Making the coil 7 wire from an alloy with high heat resistance allows to obtain large current densities and to reduce the cross section and the number of wires, which reduces the weight, size and cost of the pump.

Description

one

(21) 4335762 / 31-29

(22) 11/30/87

(46) 04/07/90. Bul № 13

(71) North-West Correspondence Polytechnic Institute

(72) V.L.Veits, L.K.Ginzburg and L.N. Salamatov

(53) 621.671 (088.8)

(56) Development of centrifugal compact pumps for liquid refrigerant pumping systems. R & D report. SZPI, 1980 Published VNTIC inv. No. B 982052.

(54) PRESSURE PUMP

(57) The purpose of the invention is to save energy, increase pump reliability and heating efficiency of the pumped medium, and reduce mass, size and cost. Sealed pump

contains an electromagnetic clutch 6 with the excitation coil 7, a sealed metal screen 11, the latter being made of metal, and the drive of the coil 7 is made of an alloy with low and high electrical resistances, respectively. When the pump is operating, the working medium washes the screen 11, effectively cooling it and the excitation coil 7, which, by increasing the reliability of the pump by cooling the heat-loaded elements, also increases the efficiency of heating the working medium. Making the coil 7 wire from an alloy with high heat resistance allows to obtain large current densities and to reduce the cross section and the number of wires, which reduces the weight, size and cost of the pump. 1 il.

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The invention relates to a pump construction, namely to hermetic pumps with a heated working medium.

The purpose of the invention is to save energy, increase reliability, reduce weight and size by using thermal energy released during operation of the electromagnetic clutch, for heating the working environment, cooling the working medium with heat-loaded pump elements and reducing the area of heat-generating surfaces while increasing efficiency - removal of the latter by increasing the efficiency of heating the pumped medium by increasing the amount of heat released on the sealed screen; reducing the cost of the pump by using cheaper materials. The drawing shows a sealed pump, a longitudinal section.

The hermetic pump includes a housing 1 with suction and discharge nozzles 2 and 3 and an impeller 4 with blades 5 installed in it, an electromagnetic clutch 6 with a cylindrical excitation coil 7 including a drive and a driven coupling half 8 and 9, the last of which is fixed on the hollow shaft 10 and a sealing metal screen 11c with a thin-walled cylindrical shell 12 placed between the coupling halves 8 and 9 and the end wall 13. The excitation coil 7 is located inside the screen 11, the shaft 10 of the driven coupling half 9 inside the suction nozzle 2. The blades 5 of the impeller 4 are made at the end 14 of the driven half coupling 9 on the side of the end wall 13 of the screen 11 In the driven coupling half 9 there are diverting axial channels 15, the screen 11 in the area of the coil 7 is installed in the housing 1 to form an annular cavity 16, and the input 17 the impeller 4 communicates with the discharge pipe 3 through the discharge channels 15 and the annular cavity 16.

 Sealed screen 11 is made of metal with low electrical resistance.

The wire of the excitation coil 7 is made of an alloy with high electrical resistance and heat resistance, and its insulation is made of heat-resistant material.

The pump works as follows. When applied to the coil 7, the excitation of a constant voltage and rotation

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The drive of the drive half coupling 8 rotates and driven half coupling 9. In this case, the blades 5 move the working medium, which further through the outgoing axial channels 15 and the annular cavity 16 enters the delivery nozzle 3. The working medium directly flows over and cools the end wall 13 and the thin-walled cylindrical shell 12 is a sealed metal screen 11 within which the excitation coil 7 is located closely. The working medium itself is heated, effectively cooling the screen 11 and the excitation coil 7, excluding possible losses of thermal energy.

Making the screen 11 with a small electrical resistance leads to an increase in eddy currents and heat generation in it, making the wire of the coil 7 of an alloy with high electrical resistance increases the heat generation, which increases the heating efficiency of the pumped medium.

Making the wire of the coil 7 from an alloy with high heat resistance allows to allow high current densities and specific surface load, reducing its cross section and quantity, as a result of which the weight, size and cost of the pump are reduced.

Isolation of the coil 7 from a heat-resistant material and effective cooling of the heat-loaded elements by the working medium increases the reliability of the pump.

Claims (3)

Invention Formula one . A sealed pump, comprising a housing with suction and discharge nozzles and an impeller with blades installed in it, an electromagnetic coupling with a cylindrical excitation coil, including driving and driven coupling halves, the latter of which are fixed on the hollow shaft, and a sealing metal screen with thin-walled a cylindrical shell placed between the coupling halves and an end wall, characterized in that, in order to save energy, increase reliability, reduce weight and dimensions by using heat energy released during operation of the electromagnetic clutch for heating the working environment, cooling the working environment of the heat-loaded elec five 0 50 55 pump and reducing the area of heat-generating surfaces while increasing the efficiency of heat removal from the latter, the excitation coil is located inside the shield, the driven half coupling shaft - inside the suction inlet, the impeller blades are made on the butt coupling half from the end wall of the shield; channels, a screen in the location area of the coil is installed in the housing with the formation of an annular cavity, and the impeller inlet is in communication with the discharge nozzle through Nala and the annular cavity. 0 five 2. Pump pop. 1, characterized in that, in order to increase the efficiency of heating the pumped medium by increasing the amount of heat released on the hermetic screen, the latter is made of metal with a small electrical resistance. 3. Pump pop. 1, characterized in that, in order to reduce the cost of the pump by using cheaper materials, the wire of the excitation coil is made of an alloy with high electrical resistance and heat resistance, and its insulation is made of heat-resistant material.