KR20240045874A - Impeller Assembly for Electronic Water Pump - Google Patents

Abstract

The present invention relates to an impeller assembly for an electronic water pump that is joined by frictional heat generated by applying ultrasonic vibration when joining a blade and a sub constituting an electronic water pump. Ultrasonic welding is performed when joining a blade and a sub constituting an impeller. By preventing the burrs that are inevitably generated along the way from being exposed, the process of burr removal is eliminated, and a welded part is formed on the protrusion formed on the sub, and the burr that is generated at the same time as the welded part is welded by ultrasonic welding after joining the joint of the blade. It relates to an impeller assembly for an electronic water pump in which a positioning groove is formed.

Description

Impeller assembly for electronic water pump { Impeller Assembly for Electronic Water Pump }

The present invention relates to an impeller assembly, and more specifically, to an impeller assembly for an electronic water pump in which a blade and a sub constituting an electronic water pump are joined by frictional heat generated by applying ultrasonic vibration when joining them.

First, looking at the prior art,

Generally, a vehicle obtains driving force by driving an engine, and the engine temperature must be maintained within a certain temperature range by processing heat obtained as a by-product of engine operation.

There are two types of engine cooling methods: air-cooling and water-cooling. However, except for special vehicles, water-cooling, which is a realistically stable cooling method, is used.

In a water-cooled engine, a water pump is installed to circulate coolant through a water jacket formed in the engine to cool the engine.

Currently, the direction of vehicle development is focusing on eco-friendly, high-efficiency, and high-fuel-efficiency vehicles, and to achieve this goal, electrification of automobile parts is being carried out.

Research is being actively conducted to electrify the water pump, which is a key component for circulating coolant in the engine and heater for the cooling system and interior heating of automobile engines.

The coolant discharged from the water pump performs heat exchange with the engine, heater, or radiator, circulates, and then flows back into the water pump. These water pumps are largely divided into mechanical water pumps and electronic (electric) water pumps.

The mechanical water pump is connected by a pulley and belt fixed to the engine's crankshaft and is driven by the rotation of the crankshaft, that is, the rotational driving force of the engine, so the flow rate of coolant discharged from the mechanical water pump is determined by the rotational speed of the engine. do.

However, the flow rate of coolant required by the heater and radiator is fixed regardless of the rotation speed of the engine.

Therefore, the heater and radiator could not operate normally in areas where the engine speed was low, and the engine speed had to be increased to operate the heater and radiator normally.

As a result, a problem occurred in which the fuel efficiency of the vehicle was reduced.

In addition, since the mechanical water pump runs along with the rotation of the engine, engine cooling cannot be arbitrarily controlled in optimal conditions, increases engine load, reduces fuel efficiency of the entire vehicle, and makes the structure around the engine complicated and bulky. There was a problem.

Accordingly, an electronic water pump was developed to improve the problems of the mechanical water pump. Unlike the mechanical water pump, the electronic water pump uses a battery as its power source and is driven by a motor whose power supply is controlled by a control device, thereby reducing the engine's power. It has the advantage of being able to determine the flow rate of the coolant regardless of the rotation speed.

However, since the parts used in the electronic water pump operate by electricity, it is important to ensure that the electrically operated parts have sufficient waterproof performance, and securing sufficient waterproof performance is the key to increasing the performance and durability of the electronic water pump. It is becoming.

The electronic water pump is formed with an inlet through which coolant flows in and an outlet through which coolant is discharged, and basically includes an impeller rotatably provided inside and an electric motor provided inside the case to rotate the impeller.

At this time, when the electric motor is a DC motor, the impeller shaft combined with the rotary shaft of the DC motor and the impeller engages and rotates, and the impeller shaft is rotationally supported by a bearing like a mechanical water pump, so that the electronic motor using the DC motor Water pumps have the disadvantage of being bulky as the length of the DC motor and impeller shaft, and requiring separate sealing or bypass lines to prevent coolant from infiltrating the bearings.

Accordingly, in order to transform the electronic water pump into a compact and optimized configuration, a BLDC motor was used as the electric motor, the shaft was fixed to the inner center of the motor case, the stator and rotor were installed, and the impeller was inserted into the rotor together. An electronic water pump has been developed that is rotatably inserted into a shaft so that the impeller rotates with the rotation of the rotor.

However, since the electronic water pump according to the prior art has a structure that rotates by inserting an injection molded product with a rotor and impeller integrated into a fixed shaft, the structure was complicated and difficult to assemble, and the inner diameter surface in contact with the shaft was prone to high-speed rotation. As a result, it deteriorates and is easily scratched or damaged, and the center of rotation is slightly distorted due to thermal expansion, which reduces durability and makes quantitative pumping difficult.

Accordingly, in the past, ‘vehicular water pump impeller’ under registration number 10-0633868, ‘automotive water pump’ under registration number 10-1256198, and ‘automotive electric water pump with built-in cooling member’ under registration number 10-1332853. , 'Electronic Water Pump' under Registration No. 10-2027834 and 'Impeller Assembly for Electric Water Pump for Removing Foreign Matter' under Registration No. 10-2015958 have been disclosed, but the above-mentioned problems are still not being improved.

The present invention was devised to solve the problems of the prior art described above, and prevents the burrs that are inevitably generated during ultrasonic welding when joining the blades and subs constituting the impeller from being exposed, thereby facilitating the process of burr removal. An impeller assembly for an electronic water pump is provided in which a welded part is formed on the protrusion formed on the sub, and the welded part is joined to the coupling part of the blade and then welded by ultrasonic welding, and at the same time, a burr position groove is formed where the generated burr is located. It was completed as a technical task with a focus on.

Accordingly, the present invention is an impeller assembly comprised of an electronic water pump and composed of a blade on which a coupling portion is formed, a sub on which a protrusion corresponding to the coupling portion is formed, a magnet, and a shaft, wherein a guide groove of a certain depth is formed at the coupling portion of the blade. Its technical feature is an impeller assembly for an electronic water pump, wherein a welded portion is formed on the protrusion of the sub and is inserted into the guide groove and joined by ultrasonic welding.

According to the impeller assembly for an electronic water pump of the present invention, the burr generated during ultrasonic welding for joining the blade and the sub is not exposed to the outside, so a burr removal process is unnecessary, and the bonding strength between the blade and the sub can be increased due to the non-exposure of the burr. It is a very effective invention, as it minimizes the durability and noise of the product due to the non-exposure of the burr, and prevents foreign substances from being generated when the water pump is operated.

1 is a perspective view showing the impeller of the present invention
Figure 2 is a perspective view showing a blade in the configuration of the present invention
Figure 3 is a perspective view showing the connection of the sub, magnet, and shaft among the components of the present invention.
Figure 4 is a perspective view showing a sub among the components of the present invention
Figure 5 is a perspective view showing a partial enlargement of Figure 4
Figure 6 is a perspective view showing the bottom of Figure 2
Figure 7 is a perspective view showing a partial enlargement of Figure 6
Figure 8 is a bottom view showing another embodiment of Figure 2
Figure 9 is a bottom view showing a partial enlargement of Figure 8

Hereinafter, the preferred configuration and operation of the present invention for achieving the above object will be described with reference to FIGS. 1 to 9 in relation to the accompanying drawings.

First, the impeller assembly 10 for an electronic water pump according to the present invention is,

In the impeller assembly comprised of an electronic water pump and composed of a blade (100) with a coupling portion, a sub (200) with a protrusion corresponding to the coupling portion, a magnet (300), and a shaft (400), the blade (100) A guide groove 120 of a certain depth is formed in the coupling portion 110, and a welded portion 220 is inserted into the guide groove 120 and joined by ultrasonic welding on the protrusion 210 of the sub 200. It is formed.

If the above-described present invention is described in more detail,

First, description of the general components and operation of the electronic warper pump will be omitted as they are the same as before.

The impeller assembly 10 of the present invention includes a blade 100 with a coupling portion, a sub 200 with a protrusion corresponding to the coupling portion, a magnet 300, and a shaft 400.

A coupling portion 110 is formed on the lower portion (bottom) of the blade 100.

The coupling portion 110 is formed from the outside to the center with a certain depth and is formed in a round shape.

The outer side of the coupling portion 110 is open, and the inner end is formed in a semicircular, oval, or square shape.

In addition, the coupling portion 110 may be formed to become deeper as it goes from the inside to the outside, or may be formed as to become deeper as it goes from the outside to the inside, or may have the same depth on the inside and outside, but may be formed to become deeper as it goes toward the center. .

A guide groove 120 is formed in the coupling portion 110.

The guide groove 120 is formed at a certain depth in the coupling portion 110, and is formed in the same shape as the welded portion 220, but is formed integrally without separation (see FIGS. 6 and 7) or the welded portion 220. They may be formed in the same shape, but may be formed in multiple numbers at regular intervals (see FIGS. 8 and 9), or may be formed as one or multiple pieces in the shape of a groove, or may be formed as one or multiple pieces in a square shape.

A plurality of auxiliary guide grooves (not shown) may be formed in the guide groove 120 at regular intervals in the longitudinal direction.

The auxiliary guide groove is intended to increase bonding strength by allowing the welded portion 220, which is melted by ultrasonic vibration, to penetrate into the auxiliary guide groove.

A burr position groove 130 is formed in the coupling portion 110 where a burr generated by ultrasonic welding is located.

The bur position groove 130 is formed in the coupling portion 110 and adjacent to the guide groove 120.

In addition, the button groove 130 may be formed with a plurality of grooves of a certain depth in a portion adjacent to the guide groove 120, or may be formed on the outer periphery of the coupling portion 110 as shown in FIG. 7. .

When the button groove 130 is formed on the outer periphery of the coupling portion 110, both ends may be open, or one side may be open and the other side may be closed.

Due to the formation of the burwich groove 130, the welded portion 220 begins to melt due to frictional heat generated when ultrasonic vibration is applied after the guide groove 120 and the welded portion 220 are joined, thereby forming the blade 100 and the sub. (200) is joined.

At this time, when a portion of the molten welded portion 220 is exposed through the gap between the coupling portion 110 and the protrusion 210, it becomes a burr. In the present invention, a portion of the molten welded portion 220 is formed in the burr position groove 130. ) so that it is not exposed to the outside and at the same time, the bonding strength is increased.

The button groove 130 is formed with a partition wall spaced apart from each other at a certain interval.

Due to the partition, durability of the blade 100 at the portion where the burr groove 130 is formed can be increased.

Additionally, one or more through grooves may be formed in the partition wall.

The molten welded portion 220 permeates into the through groove, thereby increasing bonding strength and bonding strength.

A protrusion 210 having the same shape as the coupling portion 110 of the blade 100 is formed on the sub 200.

Generally, multiple units are formed spaced apart from each other.

A welded portion 220 is formed on the upper part of the protrusion 210 so that it can be inserted into the guide groove 120 and joined by ultrasonic welding.

The welded portion 220 is formed on the upper part of the protrusion 210 and is formed in a square or round shape.

In addition, the shape of the welded portion 220 is applied the same as the shape of the guide groove 120, or the guide groove 120 is formed as an integrated piece (see FIGS. 6 and 7), and the welded portion 220 is spaced at regular intervals. It can also be a separate type (see FIGS. 3, 4, and 5) that is spaced apart and consists of multiple units.

At least one welding groove is formed in the upper part of the welding portion 200 in the longitudinal direction.

The welding groove may vary depending on the amount of the welded portion 200 that is melted.

The guide groove 120 has a width of 0.3 mm, a depth of 0.3 mm, and the end width of the depth is 0.1 mm, and the welded portion 220 has a width of 0.6 mm and a depth of 0.7 mm, and the end of the depth is a corner. there is.

The sizes of the guide groove 120 and the welded portion 220 may have an error of + or - 0.1 mm, and the optimal size is to prevent burrs from being exposed through minute gaps after the coupling portion 110 and the protruding portion 210 are joined. is the dimension of

According to the present invention as described above, the burr generated during ultrasonic welding for joining the blade and the sub is not exposed to the outside, so a burr removal process is unnecessary, and the bonding force between the blade and the sub can be increased due to the non-exposure of the burr. Due to non-exposure, the durability and noise of the product can be minimized, and foreign substances are not generated when operating the water pump.

10: Impeller assembly
100: Blade 110: Coupler 120: Guide groove
130: Burwich Home
200: Sub 210: Protrusion 220: Welded portion
300: Magnet 400: Shaft

Claims (4)

In the impeller assembly, which is configured in an electronic water pump and consists of a blade 100 with a coupling portion, a sub 200 with a protrusion corresponding to the coupling portion, a magnet 300, and a shaft 400,
A guide groove 120 of a certain depth is formed in the coupling portion 110 of the blade 100,
An impeller assembly for an electronic water pump, characterized in that a welded portion 220 is formed on the protrusion 210 of the sub 200 and is inserted into the guide groove 120 and joined by ultrasonic welding.
According to clause 1,
An impeller assembly for an electronic water pump, characterized in that the coupling portion 110 is formed with a burr position groove 130 where a burr generated by ultrasonic welding is located.
According to clause 1,
The impeller assembly for an electronic water pump, characterized in that the welded portion 220 is formed integrally or is formed in plural numbers at regular intervals.
According to clause 1,
The guide groove 120 has a width of 0.3 mm, a depth of 0.3 mm, and a width at the end of the depth of 0.1 mm,
The welded portion 220 is an impeller assembly for an electronic water pump, characterized in that the width is 0.6 mm, the depth is 0.7 mm, and the end of the depth is a corner.