JP2018076866A - water pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water pump.SOLUTION: The invention provides a water pump including: a driving shaft which is rotated by exterior driving force transmitted thereto; an impeller which is connected with the driving shaft and rotates; a cover frame including a main frame in which a housing space which houses the impeller is formed, a suction pipe which is formed so as to communicate with one side of the main frame and through which a fluid is suctioned into the housing space, and a partition wall extending from the suction pipe and disposed at one side between the main frame and the impeller. The water pump according to the invention prevents inflow of foreign objects into an impeller upper end part by adding the partition wall in between the main frame and the impeller. Further, the water pump according to the invention enables foreign objects to be smoothly discharged from the water pump by inclining an outer end of an impeller base.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a water pump, and more particularly to a water pump that sucks cooling water and circulates the cooling water inside an engine and a water pump used in a vehicle cooling system.

  The water pump means a pump that forcibly circulates cooling water inside the engine and a product that cools electrical components inside the vehicle. Generally, an engine that obtains power using the explosive force of a fuel, such as an automobile engine, generates high-temperature heat during operation. If this cannot be properly controlled, it will adversely affect not only the engine itself but also other adjacent engines. Therefore, cooling water is essentially used as a means for cooling the heat.

Generally, a water pump of an internal combustion engine is forcibly driven by a belt connected to a crankshaft of the engine to rotate an impeller inside the pump.
In the case of an environment-friendly vehicle such as an electric vehicle, a hybrid, a plug-in hybrid, and a fuel cell, a cooling water (water) pump is provided for cooling an inverter, an HSG, a stack, and the like.

Such a cooling water pump is configured to be driven in conjunction with a normal engine, or is configured to be driven by being supplied with a separate power source.
The rotating impeller sucks cooling water in the center, applies centrifugal force to the sucked cooling water, and allows the cooling water to circulate inside the engine.

  The cooling water flowing into the water pump is small but often contains foreign matter. When such foreign matter flows into the water pump, the driving of the water pump can be stopped. As a result, the cooling water cannot be circulated, and the engine and the inverter are seriously damaged by overheating.

  Patent Document 1 has been devised to reduce the influence of such a foreign matter on the water pump. Referring to FIG. 1, Patent Document 1 relates to a foreign matter removing apparatus for a pump that can discharge foreign matter sandwiched between an impeller 1 and a casing 2, and more specifically, a fluid is sucked in. The present invention relates to a foreign matter removing apparatus for a pump, which mainly includes a scraper ring 3 that slides in the direction in which the foreign matter flows between the impeller 1 and the casing 2.

  At this time, according to Patent Document 1, it is impossible to prevent the inflow of foreign matter between the upper end portion of the impeller and the upper end portion frame of the water pump. That is, the foreign matter once flowed in can be easily removed, but the foreign matter inflow itself cannot be fundamentally prevented.

  Further, Patent Document 1 does not disclose any method for preventing the foreign matter flowing into the impeller from flowing into the water pump. That is, there are many incidental equipment such as a bearing and a seal unit between the rotating shaft and the water pump frame, but it is impossible to prevent foreign matter from flowing into such equipment.

  Therefore, there is an increasing need for a water pump having a separate structure for minimizing the inflow of foreign matter contained in the cooling water into the water pump.

Korea Registered Patent No. 10-1635538

  The present invention has been devised to achieve the above-described object, and provides a water pump having a structure that minimizes the inflow of foreign matter between the water pump impeller and the main frame. Has its purpose. Another object of the present invention is to provide a water pump having a structure for easily discharging foreign matter that has flowed into the impeller.

  The present invention includes a drive shaft that is rotated by being transmitted with an external drive force, an impeller that is coupled to the drive shaft and is rotated, a main frame in which a housing space for housing the impeller is formed, and the main frame A suction pipe that is formed so as to communicate with one side of the housing space, and a fluid is sucked into the housing space, and extends through the suction pipe, and is disposed on one side between the main frame and the impeller. A water pump including a partition wall and a cover frame including the partition wall is provided.

  The impeller includes a disk-like base to which the drive shaft is connected at the center, a plurality of blades coupled to the upper surface of the base and extending radially from the center of the base, and an upper end of the blade. A disk-shaped shroud to be coupled, and an inflow pipe that is formed to communicate with one side of the shroud, and into which fluid flows into the impeller, and the partition wall is disposed inside the inflow pipe. Can be extended.

The cover frame may include a pair of projecting pieces projecting from the main frame and disposed on the outer peripheral surfaces of the shroud and the base to form a discharge port through which fluid flowing into the impeller is discharged. .
The base may be formed with an inclined outer end to guide fluid to the center of the discharge port.

  According to the water pump of the present invention, by adding a partition wall between the main frame and the impeller, foreign substances can be prevented from flowing into the impeller and the main frame. Further, according to the water pump of the present invention, there is an object in that the flow path is configured so that the outer end of the impeller base is inclined and the foreign matter is smoothly discharged from the water pump.

It is sectional drawing which shows the conventional water pump. It is sectional drawing of the water pump by one Embodiment of this invention. It is sectional drawing which shows the movement of the cooling water and foreign material which flow in into the conventional water pump. It is sectional drawing which shows the movement of the cooling water and foreign material which flow in into the water pump by one Embodiment of this invention.

  Although the present invention has been described with reference to the embodiment shown in the drawings, this is merely an example, and those skilled in the art can make various modifications and equivalent other embodiments. You will understand that. Therefore, the true technical protection scope of the present invention should be determined by the technical idea of the claims.

  Even if the water pump according to an embodiment of the present invention is provided inside the automobile and sucks the cooling water circulated inside the automobile engine, the inverter and the like, this is only one embodiment, It goes without saying that the structure of the water pump according to the present invention can be applied to any pump having a structure for sucking and discharging a fluid using the rotational force of the impeller. Therefore, although it will be described below using the words “cooling water” and “water pump”, it can be understood that this means any fluid including cooling water and any pump type including a water pump.

Referring to FIG. 2, the water pump 100 according to the embodiment of the present invention includes a drive shaft 110, an impeller 120, and a cover frame 130.
The driving shaft 110 is rotated by receiving an external driving force. Although not shown separately, even if the external driving force is transmitted to the driving shaft 110 by a driving motor provided separately, the driving force is driven by a belt connected to the crankshaft of the engine. It may be transmitted to the shaft 110.

  The impeller 120 is connected to the drive shaft 110 and rotates. More specifically, the impeller 120 includes a disk-shaped base 121 that is connected to the drive shaft 110 at the center, and a plurality of impellers 120 that extend radially from the center of the base 121. A plurality of blades 122, a disk-like shroud 123 coupled to the upper end of the blade 122, and an inflow pipe 124 that is formed to communicate with one side of the shroud 123 and into which fluid flows into the impeller. And can be included.

  The cover frame 130 is formed to communicate with a main frame 131 in which an accommodation space 131a in which the impeller 120 is accommodated is formed, and to one side of the main frame 131, and in the accommodation space 131a. A suction pipe 132 into which fluid is sucked; and a partition wall 133 extending from the suction pipe 132 and disposed on one side between the main frame 131 and the impeller 120.

At this time, the partition wall 133 may extend inside the inflow pipe 124. Since the inflow pipe 124 and the partition wall 133 form a double wall, it is possible to prevent foreign matter from flowing into the space generated between the shroud 123 and the upper portion of the main frame 131.
The cover frame 130 protrudes inside the main frame 131 and is disposed on the outer peripheral surfaces of the shroud 123 and the base 121, and forms a pair of discharge ports 134a through which the fluid flowing into the impeller 120 is discharged. The protruding piece 134 may be included.

  The discharge port 134a is cooled from the water pump 100 so that cooling water that flows into the impeller 120, receives rotational force from the blade 122, and flows out of the impeller 120 flows into the engine and the inverter. This is the exit from which water is expelled. Transfer of cooling water from the discharge port 134a to an engine such as an engine is designed by various methods, and since this is a known technique, detailed description thereof is omitted.

  The base 121 may be formed with an inclined outer end to guide a fluid to the center of the discharge port 134a. This is to prevent foreign matter from flowing into the lower end of the base 121.

  Preferably, the outer end of the base 121 is bent upward, and the velocity vector of the cooling water that escapes from the impeller 120 is directed toward the upper end. As a result, foreign matter can be discharged to the discharge port 134a without flowing into the lower end of the base 121. However, this is merely an embodiment of the present invention, and the shape of the base 121 for guiding the fluid to the center of the discharge port 134a may be formed in various shapes according to the designer's choice.

  The water pump 100 according to an embodiment of the present invention may further include a shaft frame 140, a seal unit 150, and a bearing 160.

  The shaft frame 140 has an upper end coupled to the cover frame 130 and accommodates the drive shaft 110, the seal unit 150, and the bearing 160 therein.

  The seal unit 150 is a mechanical element that prevents cooling water from flowing into the shaft frame 140. Although FIG. 2 shows that the seal unit 150 is directly coupled to the drive shaft 110, this is only one embodiment. Even if the seal unit 150 itself has a structure in which the inner surface rotates like a bearing and the outer surface is fixed to an external object, after the separate bearing is coupled to the shaft, the seal unit 150 is attached to the outer surface of the bearing. It may also be a structure that bonds 150.

  The bearing 160 supports the drive shaft 110 by coupling an inner surface with the drive shaft 110 and an outer surface with the shaft frame 140. The bearing is a mechanical element that rotates the shaft while fixing the rotating shaft at a fixed position and supporting the weight of the shaft and the load applied to the shaft. Although FIG. 2 illustrates a ball bearing, this is only one embodiment, and various types of bearings are used.

  The features of the present invention can be clearly understood by comparing and referring to FIGS. 3A and 3B. FIG. 3A shows a moving path of cooling water and foreign matter flowing into a conventional water pump, and FIG. 3B shows cooling water and foreign matter flowing into the water pump 100 according to an embodiment of the present invention. The travel route is shown. Referring to FIG. 3A, the conventional water pump has no partition wall and is not inclined at the outer end of the impeller base, and foreign matter flows between the water pump impeller and the main frame. However, referring to FIG. 3B, the water pump 100 according to an embodiment of the present invention includes a partition wall 133, and an outer end of the impeller base 121 is inclined, so that the foreign matter is separated from the water pump impeller 120 and the main body. It does not flow into the frame 131 and is immediately discharged to the discharge port 134a. Thereby, it is possible to smoothly circulate the cooling water to the engine and the inverter while preventing the water pump 100 from being damaged by the foreign matter.

  The present invention is applicable to technical fields related to water pumps.

DESCRIPTION OF SYMBOLS 100: Water pump 110: Drive shaft 20: Impeller 121: Base 122: Blade 123: Shroud 124: Inflow pipe 130: Cover frame 131: Main frame 132: Suction pipe 133: Bulkhead 134: Projection piece

Claims (4)

A drive shaft that is rotated by receiving an external drive force; and
An impeller coupled to the drive shaft and rotating;
A main frame in which an accommodation space in which the impeller is accommodated is formed; a suction pipe that is formed to communicate with one side of the main frame; and a fluid that is sucked into the accommodation space; and the suction pipe A cover frame including a partition wall extending on the one side between the main frame and the impeller,
Including water pump. The impeller has a disk-like base to which the drive shaft is connected at the center;
A plurality of blades coupled to the upper surface of the base and extending radially from the center of the base;
A disk-shaped shroud coupled to the upper end of the blade;
An inflow pipe that is formed to communicate with one side of the shroud and into which a fluid flows into the impeller.
The water pump according to claim 1, wherein the partition wall is extended inside the inflow pipe.   The cover frame includes a pair of projecting pieces projecting from the main frame and disposed on the outer peripheral surfaces of the shroud and the base, and forming a discharge port through which the fluid flowing into the impeller is discharged. Item 3. A water pump according to item 2.   The water pump according to claim 3, wherein the base is formed with an outer end inclined to guide the fluid to the center of the discharge port.