KR102613471B1 - Water pump - Google Patents

Abstract

The water pump of the present invention forms an impeller accommodating space inside which the impeller is accommodated by combining the upper casing and the lower casing, and a discharge channel communicating with the impeller accommodating space in the radial direction is formed outside the impeller accommodating space in a circumferential direction. It is formed to extend along, and the end of the discharge channel is connected to a discharge port communicating with the outside of the upper casing and the lower casing. Additionally, the start and end ends of the discharge channels are adjacent to each other but spaced apart, and the start and end ends of the adjacent discharge channels are connected by a communication passage, so that when the impeller rotates, the impact of the fluid near the end of the discharge channel is prevented. This is about a water pump that can reduce noise and vibration.

Description

Water pump {Water pump}

The present invention relates to a water pump that pumps coolant by rotating an impeller, and more specifically, to a water pump with an improved shape of an outlet flow path through which coolant is discharged.

A water pump is a device that circulates coolant in an engine or heater for engine cooling or indoor heating. 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 an 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.

1 and 2 are front cross-sectional views and partially exploded perspective views showing an example of a conventional electric water pump.

As shown, a conventional electric water pump may largely include an upper casing 10, a lower casing 20, a motor housing 30, an impeller 40, a stator 50, and a rotor 60. An inlet 10a through which fluid flows is formed in the upper casing 10. In addition, the upper casing 10 and the lower casing 20 each have concave impeller seating grooves 11 and 21 in which the impeller 40 is rotatably placed, and the impeller seating grooves 11 and 21 are formed in a radial direction. On the outside, discharge channels 12 and 22 through which the pressure of the fluid discharged from the impeller flows and is increased are formed concavely. In addition, the discharge channels 12 and 22 are formed to extend along the circumferential direction, and the end 22b of the discharge channels 12 and 22 is a discharge port through which fluid is discharged to the outside of the upper casing 10 and the lower casing 20. It is connected to (23). Here, the start end (22a) and the end end (22b) of the discharge channel 22 are adjacent to each other but are spaced apart, and the fluid that is maximally pressurized while flowing along the discharge channel 22 can be discharged through the discharge port 23. The space between the start end 22a and the end end 22b of the discharge channel 22 is blocked by a blocking portion 22c. That is, it is configured to minimize fluid leakage between the start end (22a) and the end end (22b) of the discharge channel 22.

However, when the water pump operates, as the impeller rotates, the fluid hits the end of the discharge channel due to the blocking portion, causing an increase in noise and vibration.

KR 10-1457816 B1 (2014.10.28.) “Electric water pump”

The present invention was created to solve the problems described above. The purpose of the present invention is to improve the flow path shape at the end portions of the discharge channels of the upper and lower casings where the impeller is accommodated, thereby reducing noise generated when the impeller rotates. The goal is to provide a water pump that can reduce vibration.

The water pump of the present invention for achieving the above-described object includes an upper casing and a lower casing coupled to each other, with an impeller accommodating space formed therein in which the impeller is rotatably accommodated, and the upper casing accommodates the impeller. An inlet through which fluid flows into the space is formed, and an outlet through which fluid is discharged to the outside of the upper casing and the lower casing is formed in at least one of the upper casing and the lower casing, and at least one of the upper casing and the lower casing A discharge channel is formed extending in the circumferential direction on the radial outer side of the impeller receiving space so that the fluid discharged from the impeller can flow, the discharge channel communicates with the impeller receiving space, and the end of the discharge channel is connected to the discharge port, The starting end and the ending end of the discharge channel are disposed adjacent to each other but spaced apart, and a communication passage connecting the starting end and the ending end may be formed in an area where the starting end and the ending end of the discharge channel are adjacent to each other.

In addition, the width (W) of the communication passage is the shortest distance from the outer peripheral surface of the impeller to the outermost part of the communication passage, and the width (W) of the communication passage is 25% to 45% of the end diameter (D) of the discharge channel. It can be formed in a range.

Additionally, the discharge channel may be formed to gradually increase in width or diameter from the start end to the end.

In addition, the upper casing has an upper resting groove formed concavely upward from the bottom to allow the upper side of the impeller to be inserted, and is spaced radially to the outside of the upper resting groove so that the fluid discharged from the impeller can flow upward. A concave upper discharge channel is formed, and the lower casing has a concave lower resting groove formed from the upper side to the lower side so that the lower side of the impeller is inserted, and the lower resting groove is radially formed so that the fluid discharged from the impeller can flow. A lower discharge channel is formed to be spaced apart from the outside and concave downward, and the upper discharge channel and the lower discharge channel may be disposed to correspond to each other to form the discharge channel.

In addition, the upper casing has a protruding upper partition wall dividing it between the upper resting groove and the upper discharge channel, and the lower casing has a protruding lower partition wall partitioning it between the lower resting groove and the lower discharge channel, and the upper partition wall and The lower partition walls may be formed at positions corresponding to each other in the radial direction and may be spaced apart from each other in the vertical direction.

In addition, the communication passage may be formed in a corresponding area between the upper and lower partitions in the vertical direction, and the entire area of the communication passage in the circumferential direction may be open and communicate with the upper and lower seating grooves. there is.

In addition, it further includes an impeller provided in an internal impeller accommodating space where the upper casing and the lower casing are combined, and the impeller may be a centrifugal impeller.

In addition, the lower casing may have a rotor accommodating portion in the central portion protruding downward, with a rotor accommodating space concavely formed from the upper surface to the lower side, and may further include a rotor provided in the rotor accommodating portion and coupled to an impeller.

In addition, a motor housing formed in the form of a concave container with an open upper side and coupled to the lower casing; and a stator provided inside the motor housing and coupled to the rotor receiving portion of the lower casing by being inserted into the central portion. It may further include.

In the present invention, the start and end ends of adjacent discharge channels of the upper and lower casings where the impeller is accommodated are connected by a communication passage, so that when the impeller rotates, the noise generated by the impact of the fluid near the end of the discharge channel is reduced. It has the advantage of reducing vibration.

1 and 2 are front cross-sectional views and partially exploded perspective views showing an example of a conventional electric water pump.
3 to 5 are an assembled perspective view, an exploded perspective view, and a front cross-sectional view showing a water pump according to an embodiment of the present invention.
Figure 6 is a perspective view of the upper casing of the water pump according to an embodiment of the present invention turned over.
Figure 7 is a lower plan cross-sectional view showing the upper casing of a water pump according to an embodiment of the present invention.
Figure 8 is a lower plan cross-sectional view showing the end portion of the discharge channel including the upper casing and impeller in the water pump according to an embodiment of the present invention.
Figure 9 is a top plan view showing the lower casing of a water pump according to an embodiment of the present invention.
Figure 10 is a graph evaluating the noise of a water pump according to an embodiment of the present invention.
Figure 11 is a graph analyzing the noise by frequency of a conventional water pump with a W/D ratio of 15% or less.
Figure 12 is a graph analyzing the noise by frequency of the water pump of the present invention with a W/D ratio of 25% to 45%.

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

Figures 3 to 5 are an assembled perspective view, an exploded perspective view, and a front cross-sectional view showing a water pump according to an embodiment of the present invention, and Figure 6 shows the bottom and top of the inlet portion in the upper casing of the water pump according to an embodiment of the present invention. This is a partial cross-sectional perspective view showing the bearing mounting part.

As shown, the water pump according to an embodiment of the present invention may largely include an upper casing 600 and a lower casing 200, an impeller 500, a rotor 400, a motor housing 300, It may further include a stator 100.

The upper casing 600 is coupled to the upper side of the lower casing 200, and an impeller ( An impeller accommodating space 601 in which 500) can be accommodated is formed. Additionally, an upper seating groove 630 may be formed on the lower surface of the upper casing 600 to be concave upward so that a portion of the impeller 500 can be inserted. In addition, an upper flow groove 632 is formed on the lower surface of the upper casing 600 outside the upper resting groove 630 in the radial direction, so that the fluid discharged from the impeller 500 flows along the upper flow groove 632. You can. Here, the upper resting groove 630 and the upper flow groove 632 may be formed adjacent to each other but spaced apart, and the upper resting groove 630 and the upper flow groove 632 may communicate in the radial direction, but the upper partition wall 631 Some areas may be partitioned in the vertical direction at positions between them. In addition, the upper casing 600 may be formed with an inlet 610 through which fluid flows in, and, for example, an outlet 620 through which fluid is discharged may be formed in the upper casing 600. In addition, the upper casing 600 has an inlet 610 disposed in the center, so that the inlet 610 communicates with the impeller receiving space 601, and the discharge port 620 is connected to the end of the upper flow groove 632 to communicate. You can. In addition, the upper casing 600 may have an upper bearing mounting portion 602 extending from near the bottom of the inlet 610 toward the impeller receiving space 601, and the upper bearing mounting portion 602 may have a plurality of supports 612. More may be included. The plurality of supports 612 may be arranged to be spaced apart from each other along the circumferential direction. The upper end of each of the plurality of supports 612 may be connected to the lower inner wall of the inlet 610 and the lower end may be connected to the bearing mounting portion 602, and the plurality of supports 612 move radially inward from the upper end to the lower end. It may be formed to extend in a shape slanted toward. In addition, the upper bearing mounting portion 602 has an inclined surface 603 formed so that the upper side slopes upward and radially inward, and the lower ends of the plurality of supports 612 are connected to the inclined surface 603 of the upper bearing mounting portion 602. You can. That is, the upper bearing mounting portion 602 may be formed in a shape in which the outer diameter gradually becomes smaller from approximately the midpoint in the vertical direction toward the upper direction. In addition, the upper bearing 412 may be coupled to the upper bearing mounting portion 602, and the upper bearing 412 includes a bushing (B) and a rotating shaft that can radially support the top of the rotating shaft 410 of the rotor 400. (410) It may include a support pin (P) that can support the top in the axial direction. Additionally, the upper bearing mounting portion 602 and the support 612 may be formed integrally with the upper casing 600 by injection molding.

The lower casing 200 is coupled to the lower side of the upper casing 600, and an impeller ( An impeller accommodating space 601 in which 500) can be accommodated may be formed. The lower casing 200 has a lower resting groove 210 formed concavely from the upper surface to the lower side so that the lower part of the impeller 500 can be inserted, and the impeller 500 is formed outside the lower resting groove 210 in the radial direction. ) The lower flow path groove 212 may be formed concavely so that the fluid discharged from ) can flow. Here, the lower flow groove 212 may be formed adjacent to, but spaced apart from, the lower resting groove 210. In addition, the lower resting groove 210 and the lower flow groove 212 communicate in the radial direction, but some areas may be partitioned in the vertical direction at a position between them by the lower partition wall 211. In addition, the lower casing 200 has a rotor accommodating portion 220 formed in a shape that protrudes downward from the center of the lower resting groove 210, and the rotor accommodating portion 220 is formed in the shape of a container concave downward on the upper side. You can. In addition, the rotor accommodating part 220 has a lower bearing mounting part 222 formed at the bottom of the rotor accommodating space 221, which is a concave interior, so that the lower bearing 411 can be coupled to the lower bearing mounting part 222. Here, the lower bearing 411 includes a bushing (B) capable of supporting the lower end of the rotating shaft 410 of the rotor 400 in the radial direction and a support pin (P) capable of supporting the lower end of the rotating shaft 410 in the axial direction. It can be included. Thus, the rotor 400 is inserted into and placed in the rotor accommodating space 221 inside the rotor accommodating part 220, and the outer peripheral surface of the rotor 400 may be arranged to be spaced apart from the inner peripheral surface of the rotor accommodating part 220. Additionally, the rotor receiving portion 220 may be formed integrally with the lower casing 200 by injection molding. In addition, the rotor accommodating part 220 of the lower casing 200 is inserted into the hollow inside of the stator 100 so that the rotor accommodating part 220 penetrates the stator 100 and the lower end of the rotor accommodating part 220 is connected to the stator. It may protrude downward from the lower end of the rotor housing 220, and the lower end of the rotor receiving portion 220 may be spaced apart from the bottom surface of the motor housing 300. Additionally, the outer peripheral surface of the rotor receiving portion 220 may be in contact with the inner peripheral surface of the stator 100 and coupled in a close contact state.

The impeller 500 is provided in the impeller receiving space 601, which is an internal space formed by combining the upper casing 600 and the lower casing 200, and the impeller 500 is connected to the rotor 400 to accommodate the rotor 400. The impeller 500 may rotate together with the driving of . And, for example, the impeller 500 may be a centrifugal impeller.

And in at least one of the upper casing 600 and the lower casing 200, a discharge channel is formed extending in the circumferential direction outside the radial direction of the impeller receiving space 601 so that the fluid discharged from the impeller 500 can flow. The discharge channel communicates with the impeller receiving space 601 and the end of the discharge channel may be connected to the discharge port 620. In addition, the start and end ends of the discharge channels in the circumferential direction are arranged adjacent to each other but spaced apart, and a blocking portion 640 is formed to block the start and end ends of the discharge channels adjacent to each other, where the start and end ends of the discharge channels are adjacent to each other. A communication passage connecting the start and end of the discharge channel may be formed in a form in which a portion of the blocking portion is removed from the impeller receiving space radially outward. Referring to FIG. 8, a portion 641 in which part of the blocking portion has been removed may become a communication passage. Here, the discharge channel may be the upper flow groove 632 formed in the upper casing 600 and the lower flow groove 212 formed in the lower casing 200, and the communication flow path is at the start and end of the upper flow groove 632. It may be the upper connection groove 633 connecting the and the lower connection groove 213 connecting the start and end ends of the lower flow groove 212.

Therefore, when the impeller 500 is rotated, the fluid introduced through the inlet 610 passes through the impeller 500 and then moves in a circumferential direction along the space formed by the upper flow groove 632 and the lower flow groove 212, which are discharge channels. It can be pressured while flowing and then discharged to the outside through the discharge port 620. At this time, a portion of the fluid discharged from the impeller 500 at the end of the discharge channel may flow toward the starting end of the discharge channel through the space formed by the upper connection groove 633 and the lower connection groove 213, which are communication channels. , noise and vibration generated by fluid impact near the end of the discharge channel connected to the discharge port 620 can be reduced.

Figure 7 is a lower plan cross-sectional view showing the upper casing of a water pump according to an embodiment of the present invention, and Figure 8 is a lower plan view showing the end portion of the discharge channel including the upper casing and impeller in the water pump according to an embodiment of the present invention. It is a plan cross-sectional view, and Figure 9 is a top plan view showing the lower casing of a water pump according to an embodiment of the present invention.

Here, the upper casing 600 is described as an example. In the present invention, with the upper connection groove 633 formed, one end of the upper flow groove 632 in the circumferential direction is the start end (S) of the discharge channel, and the upper flow groove 633 is formed as an example. The other end of 632 may be the end (E) of the discharge channel. And the lower casing 200 may be formed in a shape corresponding to the upper casing 600. In addition, the width (W) of the communication passage is the shortest distance from the outer peripheral surface of the impeller to the outermost part of the communication passage, and the width (W) of the communication passage is in the range of 25% to 45% of the end diameter (D) of the discharge channel. can be formed. That is, the shortest distance from the outer peripheral surface of the impeller 500 to the outermost side of the upper connection groove 633 of the upper casing 600 can be the width (W) of the communication passage, and the W/D ratio is It can be 25% to 45%. Figure 10 is a graph evaluating the noise of a water pump according to an embodiment of the present invention. As shown, when the W/D ratio is less than 25%, the noise and vibration reduction effect is small, so it can be seen that the W/D ratio must be greater than 25% to satisfy the customer's noise standard (noise standard). . Although not shown, if the W/D ratio exceeds 45%, the performance requirements such as discharge pressure and discharge flow rate of the water pump cannot be satisfied, so it is desirable that the W/D ratio be set to a maximum of 45% or less. . Figure 11 is a graph analyzing the noise by frequency of the water pump of the prior art with a W/D ratio of 15% or less, and Figure 12 is a graph analyzing the noise by frequency of the water pump of the present invention with a W/D ratio of 25% to 45%. This is the analyzed graph. As shown, it can be seen that the noise reduction effect of the water pump of the present invention is significant compared to the prior art.

Additionally, the discharge channel may be formed with a width or diameter that gradually increases from the start to the end. In addition, the communication passage is formed in a corresponding area between the upper and lower partitions in the vertical direction, and the entire area of the communication passage in the circumferential direction may be open and communicate with the upper resting groove and the lower resting groove.

The motor housing 300 may be formed in the form of a concave container made of metal, with an empty interior and an open top. Additionally, the motor housing 300 has a closed bottom, a cylindrical side, and a flange that protrudes radially outward from the outer peripheral surface at the top.

The stator 100, for example, has a plurality of teeth protruding radially inward from the inner peripheral surface of a cylindrical core, the teeth are arranged to be spaced apart from each other in the circumferential direction, and an insulator made of an electrically insulating material surrounds the core and the teeth and is surrounded by the insulator. It may be in the form of coils wound around the outside of the tooth. And the central part can be open at the top and bottom. In addition, the stator 100 may be formed in various shapes and configurations. Additionally, the stator 100 is provided inside the motor housing 300, and the outer peripheral surface of the stator 100 may be coupled and fixed in close contact with the inner peripheral surface of the motor housing 300.

The rotor 400 is provided in the rotor accommodating space 221 of the lower casing 200, and the outer peripheral surface of the rotor 400 is arranged to be spaced apart from the inner peripheral surface of the rotor accommodating portion 220 and may be rotatable. In addition, the rotor 400 has a permanent magnet coupled to the radial outer portion of the core and a rotation axis 410 coupled to the central axis of the core. Additionally, the rotor 400 may have a lower end of the rotating shaft 410 rotatably coupled to the lower bearing 411 and an upper end rotatably coupled to the upper bearing 412.

The impeller 500 may include an upper plate 510, a lower plate 520, and blades 530, and a plurality of blades 530 are placed between the upper plate 510 and the lower plate 520 spaced apart from each other upward and downward. It may be formed to be spaced apart along the circumferential direction. In addition, a through hole is formed in the center of the upper plate 510, penetrating both sides up and down, and the inside of the impeller 500 communicates with the inlet 610 through this through hole. In addition, the outer periphery of the impeller 500 is disposed close to the lower flow groove 212 and the upper flow groove 632, so that the fluid discharged from the impeller 500 flows through the discharge flow path 621 formed by the flow grooves. After flowing along, it can be discharged through the discharge port 620 of the upper casing 600. In addition, as an example, the impeller 500 may be formed such that the blades 530 and the lower plate 520 are formed integrally with the core portion of the rotor 400, and the upper plate 510 is coupled to the upper side of the blades 530. can be formed. In addition, impellers can be formed in various shapes. Thus, the fluid flowing into the inlet 610 of the upper casing 600 flows into the interior of the impeller 500 through the through hole of the upper plate 510 of the impeller 500, and is affected by centrifugal force due to the rotation of the impeller 500. It can be pressurized and flow along the discharge channel and then discharged to the outside through the discharge port 620.

The present invention is not limited to the above-described embodiments, and its scope of application is diverse, and anyone skilled in the art can understand it without departing from the gist of the invention as claimed in the claims. Of course, various modifications are possible.

100: Stator
200: lower casing
210: Lower resting groove 211: Lower bulkhead
212: lower flow groove 213: lower connection groove
220: Rotor receiving part
221: Rotor accommodation space 222: Lower bearing mounting portion
300: motor housing
400: rotor 410: rotation axis
411: lower bearing 412: upper bearing
420: Insertion groove
B: Bushing P: Support pin
500: Impeller
510: top plate 520: bottom plate
530: blade
600: upper casing
601: Impeller accommodation space 602: Upper bearing mounting portion
603: slope
610: inlet 612: support
620: discharge port
630: upper seating groove 631: upper bulkhead
632: upper flow groove 633: upper connection groove
640: Blocking unit
641: Part of the blocking part deleted
S: Start end of discharge channel E: End end of discharge channel

Claims (9)

An impeller accommodating space in which the impeller is rotatably accommodated is formed therein, and includes an upper casing and a lower casing coupled to each other,
An inlet through which fluid flows into the impeller receiving space is formed in the upper casing, and an outlet through which fluid is discharged to the outside of the upper casing and the lower casing is formed at least one of the upper casing and the lower casing,
A discharge channel is formed in at least one of the upper casing and the lower casing extending along the circumferential direction radially outside the impeller receiving space so that the fluid discharged from the impeller can flow, and the discharge channel communicates with the impeller receiving space. The end of the discharge channel is connected to the discharge port,
The starting and ending ends of the discharge channels are arranged adjacent to each other but spaced apart, and a blocking portion is formed to block between the starting and ending ends of the adjacent discharge channels, from the impeller receiving space in the area where the starting and ending ends of the discharge channels are adjacent to each other. A water pump, characterized in that a communication passage connecting the start and end of the discharge channel is formed in a form in which a portion of the blocking portion is removed radially outward.
According to paragraph 1,
The width (W) of the communication passage is the shortest distance from the outer peripheral surface of the impeller to the outermost of the communication passage,
A water pump, wherein the width (W) of the communication passage is formed in the range of 25% to 45% of the end diameter (D) of the discharge channel.
According to paragraph 1,
The water pump is characterized in that the width or diameter of the discharge channel gradually increases from the start end to the end.
According to paragraph 1,
The upper casing is,
An upper resting groove is formed concave upward from the bottom to allow the upper side of the impeller to be inserted, and an upper flow groove is formed concave upward and spaced apart from the upper resting groove in the radial direction so that the fluid discharged from the impeller can flow. And
The lower casing is,
A lower resting groove is formed concavely from the upper surface to the lower side so that the lower side of the impeller is inserted, and a lower flow groove is formed concave downward and spaced apart from the lower resting groove in the radial direction so that the fluid discharged from the impeller can flow. And
A water pump, wherein the upper flow groove and the lower flow groove are arranged to correspond to each other to form the discharge channel.
According to paragraph 4,
The upper casing has a protruding upper partition wall dividing it between the upper resting groove and the upper discharge channel, and the lower casing has a protruding lower partition wall partitioning it between the lower resting groove and the lower discharge channel,
The water pump is characterized in that the upper and lower partitions are formed at positions corresponding to each other in the radial direction and are spaced apart from each other in the vertical direction.
According to clause 5,
The communication passage is formed in a corresponding area between the upper and lower partitions in the vertical direction,
The water pump is characterized in that the entire area of the communication passage in the circumferential direction is open and in communication with the upper and lower seating grooves.
According to paragraph 1,
It further includes an impeller provided in an internal impeller receiving space where the upper casing and the lower casing are combined,
A water pump, characterized in that the impeller is a centrifugal impeller.
In clause 7,
The lower casing has a rotor accommodating portion protruding downward in the central portion, with a rotor accommodating space concavely formed from the upper surface to the lower side,
A water pump further comprising a rotor provided in the rotor receiving portion and coupled to an impeller.
According to clause 8,
a motor housing formed in the form of a concave container with an open upper side and coupled to the lower casing; and
A stator provided inside the motor housing and coupled to the rotor receiving portion of the lower casing by being inserted into the central portion; A water pump further comprising:

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