A jet-type cooler with multi-armed jet nozzles for electric motors

Abstract

The invention relates to a jet-type cooler with multi-armed jet nozzles for electric motors, which increases cooling efficiency by using a venturi-shaped structure.

Description

[0001] A JET-TYPE COOLER WITH MULTI-ARMED JET NOZZLES FOR ELECTRIC MOTORS

[0002] TECHNICAL FIELD

[0003] The invention relates to a jet-type cooler with multi-armed jet nozzles for electric motors, which increases cooling efficiency by using a venturi-shaped structure.

[0004] BACKGROUND

[0005] Cooling of electric motors is crucial for maintaining optimal operating temperatures, ensuring efficiency, and extending the motor’s lifespan. In the known state of the art, electric motor cooling systems include:

[0006] • Air cooling,

[0007] • Totally enclosed fan cooling,

[0008] • Water cooling,

[0009] • Oil cooling

[0010] • Finned passive cooling.

[0011] Among these, air cooling and enclosed fan systems are often insufficient. While water and oil cooling systems provide good cooling performance, they are not economical and stand out due to their operational and maintenance difficulties. Finned passive cooling systems are rarely preferred due to their very limited cooling capacity.

[0012] In summary, electric motors require a cooling system that is simple, economical, has very low operating costs, and offers high performance.

[0013] Existing air-cooled systems typically work by drawing ambient air using a fan and blowing it — generally from the rear — onto the motor surface to remove unwanted heat. However, the air directed at the motor body quickly loses momentum due to interaction with the surrounding environment and mixes with the ambient air before reaching the front of the motor. This leads to non-uniform cooling of the motor body, creates temperature gradients along its surface, and causes thermal stress. This not only reduces performance but also shortens the lifespan of the motor housing material.

[0014] Water and oil cooling systems, on the other hand, are not economical due to high initial manufacturing costs, operational complexity, and the need for constant monitoring and maintenance. Finned passive cooling systems offer very limited heat transfer performance and are generally preferred only for small and low-power motors.

[0015] LIST OF FIGURES

[0016] Figure 1. Exploded isometric general view of the system

[0017] Figure 2. Illustration of the connection between the grille fan cap, fan impeller, and shaft

[0018] Figure 3. Illustration of the fan body component

[0019] Figure 4a. Isometric view of the venturi-shaped connector

[0020] Figure 4b. Side view of the venturi-shaped connector

[0021] Figure 5. Illustration of the expansion chamber component

[0022] Figure 6. Illustration of the transfer connector components

[0023] Figure 7. Illustration of the jet nozzle arms

[0024] Figure 8. Illustration of the electric motor component

[0025] Reference numbers in figures:

[0026] 1. Grilled Fan Cap

[0027] 1 .1 . Bolt / nut connection point

[0028] 1.2. Fan shaft bearing

[0029] 2. Fan Impeller and Shaft

[0030] 2.1 . Keyed impeller shaft connection

[0031] 3. Fan Body

[0032] 4. Venturi-Shaped Connector

[0033] 5. Expansion Chamber

[0034] 5.1 . Expansion chamber duct holes

[0035] 5.2. Fan shaft bearing in the expansion chamber

[0036] 6. Transfer Connectors

[0037] 7. Jet Nozzle Arms

[0038] 7.1 . Circular jet nozzles

[0039] 8. Electric Motor Body

[0040] 8.1. Slotted tail shaft

[0041] 8.2. Motor power transmission shaft DETAILED DESCRIPTION OF THE INVENTION

[0042] The invention is based on jet-type air cooling systems. The system subject to the invention is designed to be retrofitted to almost all electric motors. In this design, dimensions can be adjusted, and the jet nozzle arms can be positioned at angles and made of flexible material.

[0043] The invention consists of the following components assembled to cool an electric motor (8): a grilled fan cap (1 ), a fan impeller and shaft (2), a fan body (3), a venturi-shaped connector (4), an expansion chamber (5), transfer connectors (6), jet nozzle arms (7).

[0044] The working principle of our invention is explained in this section. Ambient air is gathered into a cylindrical volume with the help of a fan impeller (2) that is connected to the slotted tail (rotor) shaft (8.1 ) of an electric motor (8) via a keyed fit (or other coupling types such as press-fit depending on the design).

[0045] The ambient air collected in this area is then directed with less turbulence through the venturi-shaped connector (4) into the expansion chamber (5), in order to be guided smoothly to the jet nozzle arms (7).

[0046] The air entering the expansion chamber (5) is distributed via twenty axial profile openings (this number may vary depending on system size) and directed into jet nozzle arms (7) mounted on transfer connectors (6) attached to these openings.

[0047] The jet nozzle arms (7) are elongated rectangular prisms with a conical structure. Circular jet nozzles (7.1 ) are placed on the inner surfaces of these arms (facing the motor body). There are eight jet nozzles per arm (the number can be adjusted based on the system size). These nozzles may be of equal diameter or arranged in sequentially decreasing diameters toward the tip to increase jet velocity.

[0048] Air guided from the system body into the jet nozzle arms (7) exits through these jet nozzles (7.1 ) and directly impacts the surface or fins of the electric motor body (8), sweeping away unwanted heat from these regions.

[0049] The grilled fan cap (1 ) and the fan body (3) are connected by four bolt / nut connections (1.1 ). Sealing materials such as O-rings, gaskets, or silicone are used between the connection surfaces.

[0050] Inside the assembly formed by the grilled fan cap (1 ) and fan body (3), the fan impeller and shaft (2) are centered. This centering is achieved by placing the fan shaft in a bearing (1.2) located in the center of the grilled fan cap (1 ). The venturi-shaped connector (4), fixed to the fan body (3) by four bolts / nuts, is similarly connected to the expansion chamber (5) using four bolts / nuts.

[0051] The transfer connectors (6), mounted into the duct holes (5.1 ) on the bottom surface of the expansion chamber (5), are made of flexible and durable material and serve as the link between the expansion chamber (5) and the jet nozzle arms (7).

[0052] Jet nozzle arms (7) are attached to the expansion chamber (5) via transfer connectors (6) and are positioned onto the electric motor body (8).

[0053] The fan shaft (2) passes through the fan body (3) and venturi-shaped connector

[0054] (4), is seated in the bearing holes (5.1 ) in the center of the expansion chamber (5), and is fixed to the slotted tail shaft (8.1 ) at the back of the electric motor body (8) via a keyed shaft connection (2.1 ).

[0055] Driven by the slotted tail shaft (8.1 ) of the electric motor, the fan shaft (2) is supported at both ends and can freely rotate. This rotation creates axial air flow via the fan impeller (2) mounted on the shaft.

[0056] This airflow enters through the grilled fan cap (1), passes through the fan body (3), venturi-shaped connector (4), expansion chamber (5), and transfer connectors (6), and finally reaches the jet nozzle arms (7).

[0057] The cooling air, now directed into the jet nozzle arms (7), exits through the circular jet nozzles (7.1 ) and strikes the surface of the electric motor body (8), thereby achieving cooling.

[0058] The cooled electric motor then transfers mechanical power to the connected system through the power transmission shaft (8.2).

[0059] Grilled Fan Cap (1): Also referred to as the suction mouth where ambient air is drawn in, this component ensures rough filtration of the air and directs it correctly through guide vanes toward the fan impeller. The center of this part contains a ball-bearing fan shaft housing (1 .2) that allows the fan shaft to rotate freely and with low friction.

[0060] Fan Impeller and Shaft (2): The fan impeller has eight blades designed to create axial airflow and is mounted onto a shaft using a keyed fit. The shaft is supported by bearings located in the grilled fan cap (1 ) and at the center of the expansion chamber

[0061] (5) (fan shaft housing (5.2)), allowing it to rotate freely. It is driven by the electric motor’s rotor tail shaft (8.1 ), to which it is fixed via press-fit or keyed coupling. Fan Body (3): This part encloses the fan impeller and shaft (2), isolates them from the ambient environment, and forms the outer casing of the air intake chamber. It is mounted to the grilled fan cap (1 ) and to the venturi-shaped connector (4) via four boltnut connections.

[0062] Venturi-Shaped Connector (4): This component connects the fan body (3) to the expansion chamber (5). It gathers ambient air into a cylindrical area, then directs it through a venturi-shaped profile toward the jet nozzle arms (7) with reduced turbulence. This custom geometry — narrowing and then widening again — helps streamline airflow and reduce turbulence, resulting in more uniform air delivery to the jet arms.

[0063] Expansion Chamber (5): Acts as an intermediate volume between the venturi connector (4) and the jet nozzle arms (7). Its roles are to guide and stabilize airflow, and to distribute it through transfer connectors (6). The chamber increases air pressure by calming the flow, then redirects the air into the jet arms. With these functions, the expansion chamber is both a novel and vital component of the invention.

[0064] Transfer Connectors (6): These elements transfer the air collected and stabilized in the expansion chamber (5) into the jet nozzle arms (7). They are made of flexible and mechanically robust material, allowing angled positioning. Depending on the number of jet nozzle arms required, they are mounted accordingly to the expansion chamber (5).

[0065] Jet Nozzle Arms (7): These components are designed to spread the cooling air evenly over the surface ofthe target electric motor and its fins, ensuring homogeneous surface cooling. The number and dimensions of the jet arms can be adjusted based on the structural features of the motor. Each arm is a rectangular prism-shaped channel with multiple circular jet nozzles (7.1 ) on the inner surface (facing the motor). These nozzles discharge air toward the surface to be cooled, ensuring effective and uniform heat removal. The unique profile design represents a novelty aspect by enabling equal distribution of cooling air over the entire motor surface. Electric Motor Body (8): This component represents the electric motor onto which the cooling system is mounted. The motor body can have finned or non-finned surfaces.

Claims

CLAIMS1 . A jet-type cooler to be connected to the tail (rotor) shaft (8.1 ) of an electric motor (8) for electric motors, characterized by comprising: o a grilled fan cap (1 ), o a fan impeller and shaft (2), o a fan body (3), o a venturi-shaped connector (4) having a geometry that narrows and then widens again, o an expansion chamber (5) with axial profile openings (5.1), o transfer connectors (6), o jet nozzle arms (7), and o circular jet nozzles (7.1 ) on the surface of the jet nozzle arms (7) facing the electric motor body (8).

2. The jet-type cooler according to claim 1 , characterized in that the electric motor body (8) includes a slotted tail shaft (8.1 ) and a motor power transmission shaft (8-2).

3. The jet-type cooler according to claim 2, characterized in that the fan impeller and shaft (2) comprise a keyed shaft connection (2.1 ) enabling fixation to the tail shaft (8.1 ) located at the rear of the electric motor body (8).

4. The circular jet nozzles (7.1 ) mentioned in claim 1 , characterized in that the holes may have equal diameters or sequentially decreasing diameters to increase jet velocity.

5. The jet-type cooler according to claim 1 , characterized in that sealing materials such as O-rings, gaskets, or silicone are used between the grilled fan cap (1 ) and the fan body (3).

6. The grilled fan cap (1 ) mentioned in claim 1 , characterized in that its center includes a ball-bearing fan shaft housing (1.2) that allows the fan shaft (2) to rotate freely and with low friction.

7. The expansion chamber (5) mentioned in claim 1 , characterized in that it includes a fan shaft housing (5.2) that supports the rotation of the fan impeller and shaft (2).

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