KR102697715B1 - Water pump - Google Patents

Abstract

The water pump of the present invention comprises: an outer housing having an inlet formed on one side for introducing fluid and an outlet formed on the other side for discharging fluid; an inner housing inserted into the interior of the outer housing; a driving screw and a driven screw arranged inside the inner housing and rotatably engaged with each other; a stator coupled to the interior of the outer housing; and a rotor arranged spaced apart from the inside of the stator and having a rotational shaft coupled to the driving screw; The present invention relates to a water pump capable of improving heat generation and performance of a motor by allowing the stator and the rotor to be cooled by direct contact with a fluid to be pumped.

Description

Water pump {Water pump}

The present invention relates to a water pump that rotates a screw by driving a motor to supply cooling water.

A water pump is a device that circulates coolant to an engine or heater for cooling the engine or heating the interior. These water pumps are largely divided into mechanical water pumps and electric water pumps.

A mechanical water pump is a pump that is connected to the crankshaft of the engine and driven by the rotation of the crankshaft, while an electric water pump is a pump that is driven by the rotation of a motor controlled by a control device.

An electric water pump is a pump that largely includes a motor section and a pump section, and is a drive type pump in which the pump impeller is coupled to the drive shaft of the motor section and rotates.

And among electric water pumps, a screw pump is a pump that transfers fluid from the low pressure side to the high pressure side by means of a male screw that is coupled to the drive shaft of the motor and rotates and a female screw that is meshed with the male screw and rotates.

Figure 1 is a drawing showing a conventional screw pump.

As described above, in a conventional screw pump, a driving screw (9) and an auxiliary screw (10) are arranged inside a housing (7), and a plurality of screws (9, 10) are rotatably coupled to the housing (7), and the driving screw (9) is extended to the outside of the housing (7), so that a free end (11) of the driving screw (9) can be coupled to a driving shaft of an electric motor and driven. In addition, an inlet opening (14) that connects the inside and the outside of the housing (7) is formed on one side of the housing (7), and an outlet opening (13) is formed on the other side of the housing (7). That is, since a fluid passes through the inside of a housing (7) equipped with a plurality of screws in a conventional screw pump, the remaining portion of the housing (7) except for the inlet opening (14) and the outlet opening (13) is configured to be sealed, thereby preventing the fluid from flowing toward the motor, thereby maintaining electrical insulation of the motor.

However, in the structure of a screw pump like this, it is difficult to cool the motor part that drives the screw, making it difficult to improve the performance of the motor. In addition, since the motor part and the pump part must be manufactured separately and assembled, productivity may decrease and the assembly quality may deteriorate.

KR 10-1788952 B1 (2017.10.16.) "Screw pump formed by two or more members"

The present invention has been made to solve the problems described above, and an object of the present invention is to provide a water pump capable of improving the heat generation and performance of a motor by exposing the inside of the motor portion to a pressurized fluid to cool the motor portion.

In addition, a water pump capable of manufacturing the motor section and the pump section as one unit is provided.

In order to achieve the above-described purpose, the water pump of the present invention may include: an outer housing having an inlet formed on one side for introducing fluid and an outlet formed on the other side for discharging fluid; an inner housing having an opening formed on one side for communicating with the inlet and a communication hole formed on the other side for communicating the inside and the outside, and inserted and coupled into the inside of the outer housing; a driving screw and a driven screw arranged inside the inner housing and rotatably coupled to each other in an interlocking manner; a stator inserted and coupled into the inside of the outer housing and arranged spaced apart from the other side of the inner housing; and a rotor arranged spaced apart from the inside of the stator and having a rotational shaft coupled to the driving screw.

Additionally, at least a portion of the outer surface of the inner housing may be spaced apart from the inner surface of the outer housing to form a cooling channel through which fluid flows.

Additionally, the cooling channel may be communicated with a communication hole of the inner housing.

Additionally, the other side of the inner housing may have a flow space separated from the rotor and stator that may be communicated with the cooling channel.

In addition, a stator receiving portion that is expanded in steps is formed on the other side of the outer housing, and a stator can be inserted and coupled into the inner side of the stator receiving portion.

Additionally, the stator may have a space formed between adjacent teeth in a circumferential direction to allow fluid to pass therethrough.

In addition, the stator may further include a rotation shaft support coupled to the other side, and a rotation shaft of the rotor may be rotatably coupled to the center of the rotation shaft support, and a fluid outlet may be formed through both sides of the rotation shaft support to allow fluid to pass therethrough.

In addition, the outer housing may further include a substrate receiving portion formed outwardly on an outer surface adjacent to the cooling channel, and a control substrate coupled to the outer housing and arranged on the inner side of the substrate receiving portion.

In addition, the outer housing may further include a thrust key that is inserted and coupled into the interior thereof and supports one end of the driving screw and the driven screw.

In addition, the outlet cover may further include a cover that covers and blocks the open side of the outer housing and has a discharge port formed in communication with the interior of the outer housing through which fluid is discharged.

In addition, the invention may further include an inlet cover that covers and blocks an open side of the outer housing and has an inlet port formed to communicate with the interior of the inner housing and allow fluid to flow in.

The water pump of the present invention has the advantage of improving the heat generation and performance of the motor because the motor part is cooled by being exposed to the fluid being pumped.

In addition, there is an advantage in that the motor and pump parts can be manufactured integrally, which can improve productivity and assembly quality.

Figure 1 is a drawing showing an example of a conventional screw pump.
FIGS. 2 and 3 are front cross-sectional views showing a water pump according to one embodiment of the present invention.
FIG. 4 is a plan cross-sectional view showing a water pump according to one embodiment of the present invention.
FIG. 5 is a side cross-sectional view showing a screw portion of a water pump according to one embodiment of the present invention.
FIG. 6 is a side cross-sectional view showing the stator and rotor portions of a water pump according to one embodiment of the present invention.
Figure 7 is a front cross-sectional view showing a water pump according to another embodiment of the present invention.

Hereinafter, the water pump of the present invention will be described in detail with reference to the attached drawings.

FIGS. 2 to 4 are a front cross-sectional view and a plan cross-sectional view showing a water pump according to an embodiment of the present invention, and FIGS. 5 and 6 are a side cross-sectional view showing a screw portion and a side cross-sectional view showing a stator portion of a water pump according to an embodiment of the present invention.

As described above, a water pump according to an embodiment of the present invention may largely include an outer housing (100), an inner housing (200), a driving screw (410), a driven screw (420), a stator (500), and a rotor (600). In addition, the water pump of the present invention may further include a thrust key (300), may further include a rotational shaft support member (550), and may further include at least one of an outlet cover (120) and an inlet cover (110). In addition, the fluid may be diverse, and may be, for example, coolant (water).

The outer housing (100) is formed in a tubular shape with both sides open and can communicate with the inside. An inlet (111) for introducing fluid may be formed on one side of the outer housing (100), and an outlet (121) for discharging fluid may be formed on the other side of the outer housing (100). For example, an inlet cover (110) may be coupled to the open side of the outer housing (100), and the inlet cover (110) may be fitted to the outside of the outer housing (100) to cover and block the open side of the outer housing (100). In addition, an inlet (111) may be formed in the inlet cover (110), and the inlet (111) may be communicated with the outer housing (100). In addition, a key insertion groove is formed concavely on the inner side of the inlet cover (110), and a thrust key (300) can be inserted and coupled into the key insertion groove. An outlet cover (120) can be coupled to the open other side of the outer housing (100), and the outlet cover (120) can be coupled to the outer housing (100) in various forms to cover and block the open other side of the outer housing (100). In addition, an outlet (121) is formed in the outlet cover (120), and the outlet (121) can be communicated with the outer housing (100).

The inner housing (200) may be formed in a container shape with one side open. For example, the inner housing (200) may be formed in a cylinder shape so that the interior is empty, an opening may be formed on one side, and a communication hole (210) may be formed on the other side. Thus, the inner housing (200) may be communicated with the inlet (111) through the opening on one side, and may be communicated with the interior of the outer housing (100) through the communication hole (210) on the other side. The communication holes (210) may be formed in multiple numbers, and a through hole (230) penetrating both sides is formed on the other side of the inner housing (200), so that the rotational shaft (610) of the rotor (600) may be inserted into the through hole (230). In addition, the interior of the inner housing (200) may be formed in a shape corresponding to a shape in which the driving screw (410) and the driven screw (420) are engaged. In addition, the inner housing (200) can be inserted into the inner side of the outer housing (100) from the other side to one side, and for example, one side of the inner housing (200) can be press-fitted into the inner side of the outer housing (100) and joined. In addition, a support pin (220) can be formed to protrude from the inner wall on the other side of the inner housing (200), and a coupling (430) can be provided on the inside of the other side of the inner housing (200).

The thrust key (300) can be inserted and coupled into the key insertion groove of the inlet cover (110), and the thrust key (300) can be interposed and sandwiched between the inlet cover (110) and the inner housing (200). For example, the thrust key (300) can be formed in the shape of a square bar having a square cross section and a length that is longer than its thickness and width. In addition, the thrust key (300) can be inserted into the interior of the outer housing (100), and the thrust key (300) can serve to support one end of the driving screw (410) and the driven screw (420).

The driving screw (410) may be a male screw having a spiral projection formed along the outer surface. One end of the driving screw (410) is supported by a thrust key (300), and the other end of the driving screw (410) is coupled to a rotational shaft (610) of a rotor (600) through a coupling (430), so that the rotational shaft (610) and the driving screw (410) may be configured to rotate smoothly together.

The driven screw (420) may be a female screw having a spiral groove concavely formed along the outer surface of the rotation shaft, and the spiral groove of the driven screw (420) may be formed in a shape corresponding to the spiral projection of the driving screw (410), so that the driving screw (410) and the driven screw (420) may be configured to interlock and rotate together. In addition, one end of the driven screw (420) may be supported by a thrust key (300) and the other end of the driven screw (420) may be supported by a support pin (220) of the inner housing (200) so as to rotate smoothly.

The stator (500) is arranged inside the outer housing (100), and the stator (500) can be fixedly coupled with its outer surface in close contact with the inner surface of the outer housing (100). In addition, one side of the stator (500) can be arranged to be spaced apart from the inner housing (200), and the other side can be arranged to be spaced apart from the outlet cover (120). In addition, the stator (500) can have a space formed between teeth adjacent to each other in the circumferential direction so that a fluid can pass through it. Here, a stator receiving portion (101) can be formed in a stepped form on the other side of the outer housing (100), and the stator (500) can be inserted and coupled inside the stator receiving portion (101) so that the stator (500) can be seated in an accurate position.

In addition, a rotation shaft support member (550) may be coupled to the other side of the stator (500). The rotation shaft support member (550) has a hole formed in the center penetrating both sides, into which the other side of the rotation shaft (610) of the rotor (600) may be inserted, and the rotation shaft (610) may be rotatably coupled to the hole of the rotation shaft support member (550). Here, a bushing or bearing is coupled to the hole of the rotation shaft support member (550) to which the rotation shaft (610) is rotatably coupled and the through hole (230) of the inner housing (200), and the rotation shaft (610) is inserted and coupled inside thereof, so that the rotor (600) may rotate smoothly. And the rotating shaft support member (550) may be formed with a plurality of fluid outlets (551) penetrating both sides, and the fluid outlets (551) may be connected to a space spaced apart between neighboring teeth in the circumferential direction of the stator (500) so that fluid may pass through, and the fluid outlets (551) may also be formed to be connected to a gap between the inner side of the stator (500) and the outer side of the rotor (600).

The rotor (600) is arranged inside the outer housing (100) and inserted into the inner side of the stator (500), and is arranged spaced apart from the inner side of the stator (500) but adjacent to it, and one side of the rotational shaft (610) can be coupled to the driving screw (410) by passing through the through hole (230) formed in the inner housing (200). Here, the other end of the driving screw (410) is inserted into the coupling (430) with the coupling (430) interposed therebetween, and one end of the rotational shaft (610) of the rotor (600) is inserted into the coupling (430), so that the driving screw (410) and the rotational shaft (610) can be connected.

Thus, as illustrated, the fluid introduced through the inlet (111) from the outside of the water pump is pressurized as it passes between the driving screw (410) and the driven screw (420) that rotate inside the inner housing (200), and then flows through the communication hole (210) of the inner housing (200) into the flow space (250) between the other side of the inner housing (200) and the stator (500) and the rotor (600). Thereafter, a portion of the fluid in the flow space (250) flows along the spaced apart between the neighboring teeth of the stator (500) and can be discharged to the outside of the water pump through the fluid outlet (551) of the rotation shaft support (550) and the discharge port (121). And the remainder of the fluid in the flow space (250) can flow along the gap between the stator (500) and the rotating rotor (600) and be discharged to the outside of the water pump through the fluid outlet (551) of the rotating shaft support (550) and the discharge port (121).

Thus, the water pump of the present invention can improve the heat generation and performance of the motor since the stator and rotor are directly cooled by being exposed to the fluid being conveyed. In addition, since the gap between the stator and the rotor can be minimized and no structure is arranged between the stator and the motor, the performance of the motor can be improved. In addition, since the motor section including the stator and the rotor and the pump section including a plurality of screws can be easily manufactured as one piece, productivity and assembly quality can be improved.

In addition, at least a portion of the outer surface of the inner housing (200) may be spaced apart from the inner surface of the outer housing (100) to form a cooling channel (150) through which fluid flows. For example, the upper side of the inner housing (200) may be spaced apart from the outer housing (100) to form a cooling channel (150) between the upper outer surface of the inner housing (200) and the upper inner surface of the outer housing (100). In addition, the lower side of the inner housing (200) may be in contact with the outer housing (100). Here, the cooling channel (150) may be communicated with the communication hole (210) of the inner housing (200), and the cooling channel (150) may be communicated with the flow space (250). Thus, some of the fluid that is pressurized inside the inner housing (200) and flows into the flow space (250) through the communication hole (210) can flow along the cooling channel (150) and cool a component adjacent to the cooling channel (150).

For example, the water pump of the present invention may further include a control board (700), and the control board (700) may be coupled to the upper outer side of the outer housing (100) adjacent to the cooling channel (150), so that the control board (700) may be effectively cooled by the fluid flowing along the cooling channel (150). In addition, the outer housing (100) may have a substrate receiving portion (710) extended outward from the outer surface adjacent to the cooling channel (150), and the control board (700) may be arranged on the inner side of the substrate receiving portion (710) and coupled to the outer housing (100). In addition, a cover (720) may be coupled to the open upper side of the substrate receiving portion (710) to cover and block it.

FIG. 6 is a side cross-sectional view showing the stator and rotor portions of a water pump according to one embodiment of the present invention.

As illustrated, the stator (500) may be formed in such a way that, for example, a plurality of teeth (520) are formed to protrude radially inwardly from the inner surface of a cylindrical core (510), the teeth (520) are arranged to be spaced apart from each other in the circumferential direction, an insulator (530) made of an electrically insulating material surrounds the core (510) and the teeth (520), and coils (540) are wound on the outer side of the teeth (520) surrounded by the insulator (530). In addition, the stator may be formed in a form in which the central portion is open. In addition, the stator (500) may be formed in various ways.

Figure 7 is a front cross-sectional view showing a water pump according to another embodiment of the present invention.

As illustrated, a water pump according to another embodiment of the present invention is a form in which a coating layer (541) is added to the stator (500) of the above-described embodiment. For example, the coating layer (541) may be formed by over-molding the stator (500), and may also be formed by various other methods. In addition to the illustrated form, the coating layer (541) may be formed in various forms on the surface of the stator (500) that may come into contact with the fluid. Accordingly, the stator may be sealed by the coating layer and may not come into direct contact with the fluid, thereby preventing corrosion and maintaining electrical insulation.

The present invention is not limited to the above-described embodiments, and the scope of application is diverse. Anyone with ordinary skill in the art can make various modifications without departing from the gist of the present invention as claimed in the claims.

100: Outer housing 101: Stator housing
110 : Inlet cover 111 : Inlet
120 : Outlet cover 121 : Exhaust outlet
150 : Cooling Channel
200 : Inner housing 210 : Flue gasket
220 : Support pin 230 : Through hole
250 : Fluid space
300 : Thrust Key
410 : Driving screw 420 : Driven screw
430 : Coupling
500 : Stator 510 : Core
520 : Teeth 530 : Insulator
540: Coil 541: Coating layer
550 : Rotation shaft support
551 : Fluid outlet
600 : Rotor 610 : Rotating shaft
700: Control board 710: Board receiving section
720 : Cover

Claims (11)

An outer housing having an inlet formed on one side for introducing fluid and an outlet formed on the other side for discharging fluid;
An inner housing having an opening formed on one side to communicate with the inlet port and a communication hole formed on the other side to communicate the inside and the outside, and inserted and combined into the inside of the outer housing;
A driving screw and a driven screw which are arranged inside the inner housing and rotatably coupled to each other in mesh;
A stator inserted and coupled into the interior of the outer housing and arranged spaced apart from the other side of the inner housing; and
A rotor is disposed spaced apart from the inside of the stator and has a rotational axis coupled to the driving screw;
At least a portion of the outer surface of the inner housing is arranged to be spaced apart from the inner surface of the outer housing, thereby forming a cooling channel through which fluid flows.
The above outer housing has a substrate receiving portion formed outwardly on the outer surface adjacent to the cooling channel,
A water pump further comprising a control circuit board positioned inside the substrate receiving portion and coupled to the outer housing.
delete In the first paragraph,
A water pump, characterized in that the above cooling channel is communicated with the communication hole of the inner housing.
In the third paragraph,
A water pump, characterized in that the other side of the inner housing has a flow space separated from the rotor and stator and is connected to the cooling channel.
In the first paragraph,
A water pump characterized in that a stator receiving portion expanded in a stepwise manner is formed on the other side of the outer housing, and a stator is inserted and coupled inside the stator receiving portion.
In the first paragraph,
A water pump characterized in that the stator has a space formed between adjacent teeth in a circumferential direction so that fluid can pass therethrough.
In the first paragraph,
Further comprising a rotating shaft support member coupled to the other side of the stator,
A water pump characterized in that the rotation shaft of the rotor is rotatably coupled to the center of the rotation shaft support, and a fluid outlet is formed through both sides of the rotation shaft support through which fluid can pass.
delete In the first paragraph,
A water pump further comprising a thrust key that is inserted and coupled into the interior of the outer housing and supports one end of the driving screw and the driven screw.
In the first paragraph,
A water pump further comprising an outlet cover that covers and blocks the open other side of the outer housing and has a discharge port formed in communication with the interior of the outer housing through which fluid is discharged.
In the first paragraph,
A water pump further comprising an inlet cover that covers and blocks an open side of the outer housing and has an inlet port formed to communicate with the inside of the inner housing and through which fluid flows.

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