FR2977743A1

FR2977743A1 - Device for cooling an electric motor

Info

Publication number: FR2977743A1
Application number: FR1102092A
Authority: FR
Inventors: Jean Paul Domen
Original assignee: Tmw
Priority date: 2011-07-04
Filing date: 2011-07-04
Publication date: 2013-01-11
Also published as: WO2013004725A2; WO2013004725A3

Abstract

This cooling device of an electric motor (10) is constituted by a chamber (16) of polymer, having two mouths (26-28) for the entry and exit of a liquid; this enclosure (16) has a concave inner wall (15), over-molding most of the outer surface of the motor (10). The motor (10) of a motor pump (10-12), equipped with such a cooling device, is cooled by the water pumped by this pump. This device is manufactured by (a) an extrusion blow-molding of a polymer parison between the jaws of a suitable mold, in which the overmolding motor (10) has been inserted beforehand, and (b) by cutting out manufacturing plugs. Applications: Motor cooling of pump motor pumps. Cooling of electric motors of some kW.

Description

10 15 20 25 30 35 40 2977743 DEVICE FOR COOLING AN ELECTRIC MOTOR

According to the invention, a cooling device of an electric motor is constituted by an enclosure provided with two mouths allowing entry and exit of a liquid; this enclosure has a concave wall, overmoulding most of the external surface of the motor; this device is manufactured by (a) an extrusion blow-molding of a polymer parison between the jaws of a suitable mold, in which the overmolding motor has been inserted beforehand, and then (b) by cutting the plugs of manufacturing. According to a variant of the invention, a cooling device of an electric motor: - is constituted by an enclosure provided with two mouths permitting the entry and the exit of a liquid; - This enclosure is manufactured by (a) an extrusion blow-molding of a polymer parison, between the jaws of a suitable mold, and (b) by cutting the plugs manufacturing; - This device further comprises an elastic sheath, in particular rubber, adapted to match the convex shape of the engine to be cooled; this sheath is sealingly connected to the edge of the wall of this enclosure. According to a particular provision, this electric motor is coupled to a pump and the liquid concerned is a part or all of the liquid circulated by this pump. Thanks to these provisions, such a cooling device makes it possible to permanently use a motor pump pumping water, without having to pay attention to the ambient conditions. It also allows to use, all things being equal, an electric motor of smaller dimensions. Indeed, such a cooler is much more effective for removing heat from the engine, since it uses pumped water instead of air; and this, all the more so, when this pumped water is cold. In addition, in the case of a pump motor pump, the heat taken away, produced by the engine thus cooled, is removed by the large free surface of the pool, without significantly modifying the temperature of the water.

The features and advantages of the invention will emerge more specifically from the following description, given by way of non-limiting example with reference to the drawing in which: - Figure 1A a side view of a motor pump equipped with a cooling device according to the invention; - Figure 1B is a top view of the cooling device of this motor pump; - Figure 1C is a view of a motor pump cooler, installed at the edge of a pool.

According to FIGS. 1A, 1B and 1C, an electric motor 10, of 2 kW, coupled to a pump 12, is overmolded by the concave inner wall 15 of an enclosure 16 with a hollow wall 18 (supposed to be transparent for the drawing), constituting the cooling device according to the invention. The insert 16 has a bottom 25 cm in diameter, a length of 30 cm and a thickness of 3 cm, between inner and outer walls 17. These walls are made of polymer and they have 2 mm thick. The dimensions, diameter and length, of the motor 10 and those of the concave wall 15 of the enclosure 16 are identical and measure respectively 20 and 25 cm. The pump 12 has an axial inlet pipe 20 and an outlet side pipe 22, both 12 cm in diameter, the pipe 22 having an angled outlet. In the vicinity of the edge 19 of the enclosure 16, hollow wall 18, constituting the cooling device, an inlet pipe 26 is molded integral with the outer wall 17 of the enclosure 16. On this outer wall, a large tubing outlet 28 is integrally molded. FIGS. 1B and 1C show the top view and the profile view of this tubing 28: a rectangular upstream mouthpiece 20 cm long and 10 cm wide with a similar but bent downstream mouth. The motor pump 10-12, equipped with its cooling chamber 16, is placed on a cushion 30, vibration damper, motor pump and cushion being fixedly installed on a shelf 32 integral with the wall 34 of a pool. The outlet pipe 28 of the cooler 18 opens above this pool. The embodiment by extrusion blow molding of such an overmolding of an electric motor, by a hollow-walled polymer enclosure, comprises a complementary operation of eliminating the two production plugs that comprise the mouths 26 and 28 of the enclosure 16 With these arrangements, the pool water can be constantly pumped, filtered, treated, and / or reheated, and then dumped into this pool. The motor pump 10-12, equipped with its cooling chamber 16, constantly traversed by this water at moderate temperature, can operate continuously, without risking any damage, due to a too high operating temperature. By providing this enclosure 16, inlet pipes 26 and outlet 28 with large sections, on the one hand, and hollow walls 15-17, with a large internal thickness (3 cm), on the other hand, the power consumed by the passage of water through this enclosure 16 is negligible. In addition, the dimensions and therefore the price of the motor 10 of the pump 12 can be reduced because of the better heat exchange at its wall. The description of the variant, presented above, for this cooling device of an electric motor is deduced directly from FIG. 1A. The inner wall 15 of the enclosure 16, overmolding the motor 10 in Figure 1A, is removed and replaced by a planar manufacturing plug, to be cut. An elastic sheath (rubber) replaces this flat cap and is adapted to take the same shape as the previous wall 15, when motor and sheath are engaged in the enclosure 16 thus modified. This sheath is manufactured by molding and has edges adapted to be engaged in a sealed manner on appropriate edges 19, which comprises the modified concave chamber 16. Under these conditions, this engine 10 has a cooling device to liquid (water or oil) quite comparable to the previous one. The power of the electric motors, equipped with one or the other of these two liquid cooling devices, can be up to a few tens of kW. 10 15 20

Claims

REVENDICATIONS1. Apparatus for cooling an electric motor (10), - constituted by an enclosure (16), provided with two mouths (26-28) allowing the entry and the exit of a liquid; - This enclosure (16) has a concave inner wall (15) overmolding most of the outer surface of the motor (10); this device is manufactured by (a) an extrusion blow-molding of a polymer parison between the jaws of a suitable mold, in which the motor (10) to be overmolded has been inserted beforehand, and then (b) by a cut-out manufacturing plugs.
2. Cooling device of an electric motor (10): - constituted by an enclosure (16), with two mouths (26-28) for the entry and exit of a liquid; - This device is manufactured by (a) an extrusion blow-molding of a polymer parison, between the jaws of a suitable mold, and (b) by cutting the plugs; - This device further comprises an elastic sheath, in particular rubber, adapted to match the convex shape of the motor (10) to be cooled; - This sheath is sealingly connected to the edge (19) of the wall (17) of the enclosure (16).
3. Cooling device of a motor pump (10-12) according to claim 1 or 2, wherein the liquid is a part or all of the liquid pumped by this pump. 25 30 35