KR20020036868A - Impeller of water pump - Google Patents

Abstract

PURPOSE: An impeller of water pump is provided to achieve improved combustion efficiency of engine by preventing engine overheat during high speed travel, while reducing emission of toxic gas during the initial start of engine. CONSTITUTION: An impeller(30) comprises a first stage impeller(31), a second stage impeller(35) and a coupling member(40). The first stage impeller includes a first stage blade(32) for applying a centrifugal force to the water coolant; and a plurality of accommodation grooves formed along the outer periphery of a shaft hole so as to accommodate the coupling member to be coupled with the second stage impeller when the water coolant has a high temperature. The first stage impeller is inserted to an end of a rotating shaft(22) so that the first stage impeller rotates together with the rotating shaft. The second stage impeller includes a second stage blade(36) having an outer diameter larger than the outer diameter of the first stage impeller, and which applies a centrifugal force to the water coolant; and a plurality of coupling holes formed along the outer periphery of a shaft hole such that the coupling holes are symmetrical to the accommodation grooves formed at the shaft hole of the first impeller. The second stage impeller is coupled to the rotating shaft. The coupling member operates to transfer the rotating force of the first stage impeller to the second stage impeller when the temperature of water coolant rises due to the high speed rotation of engine.

Description

Impeller of water pump

The present invention relates to an impeller of a water pump. More specifically, when the engine is warmed up or running at low speed, only one stage of the impeller is rotated, and when the engine is running at high speed, a key operated according to the temperature of the coolant is connected. It relates to an impeller of a water pump capable of circulating the coolant to match the engine speed by allowing the second stage impeller to rotate together with the first stage impeller.

Generally, the engine is powered by passing fuel, and the temperature of the combustion gas that is burned in the cylinder reaches 2000 ° C or higher, but not all of the heat of combustion is converted into power, and a considerable amount of heat is transferred to the cylinder head and the piston. Absorbed, causing heat loss and overheating of these parts.

As a result, excessively high temperatures, such as cylinders, may cause deformation of the cylinder or damage of the oil film on the cylinder wall, resulting in poor lubrication, and severe damage to the engine and worsening of combustion, resulting in knocking and premature ignition. The output will be drastically reduced.

As a result, the engine is cooled to prevent overheating of the engine. On the contrary, if the engine is too cooled, the heat generated by combustion cannot be converted into power, and the amount of loss due to cooling is increased, thereby lowering thermal efficiency and increasing fuel consumption. A gasoline insufficiency mixer is supplied to the engine to dilute the engine oil by gasoline to promote cylinder wear.

For this reason, a cooling system that cools the engine to prevent overheating and keeps it at a constant temperature is used in the engine. As shown in FIG. 4, the water jacket 1 surrounding the cylinder and the combustion chamber and the water circulating through the cylinder A water-cooled chiller (4) including a water pump (10), a radiator (2) that cools the engine to transfer heat of coolant whose temperature has risen to the outside, and cools it, and a cooling fan (3) that helps ventilate the radiator is mainly used. have.

The water-cooled cooling device (4) is provided with a device for changing the flow of the cooling water in accordance with the temperature of the cooling water, called the thermostat (5) .In the beginning of the low temperature of the engine, the cooling water does not flow to the radiator (2) side for heat radiation cooling By allowing the engine to circulate again through the bypass pipe (6), the temperature of the engine is quickly raised to the normal temperature. When the engine reaches the normal temperature, the thermostat (5) follows the cooling water temperature to prevent the engine from overheating. Since the cooling water is circulated to the radiator 2 to be opened, the heat dissipation is cooled, and the engine is circulated to maintain the temperature.

The warp pump 10 for forced circulation of the cooling water is composed of a pump housing 11, an impeller 12, a rotation shaft 13, a bearing 14, a pulley 15, and the like.

In addition, the side of the impeller 12 is formed with a blade 16 for forced circulation of the cooling water, the impeller 12 having the blade 16 is configured to circulate while causing the cooling water to vortex while rotating.

In other words, if the engine is warmed up or running at low speed, the rotation speed of the water pump should be slowed down to reduce the amount of coolant circulated by reducing the supply of cooling water.In the case of the engine running at high speed, the amount of cooling water should be increased by increasing the rotation speed of the water pump. Should be circulated to the cylinder block.

However, in the case of the conventional water pump as described above, only one impeller integrally formed with the rotation of the rotating shaft pumps the coolant, and thus there is a limit in circulating the appropriate amount of coolant at the initial and high speed driving. There was a problem that can not achieve the cooling effect.

Therefore, the present invention has been made to solve the above problems, more specifically, when the engine is warm-up or low-speed driving, only one stage of the impeller is rotated, when the engine is running at high speed operating in accordance with the temperature of the coolant It is an object of the present invention to provide an impeller of a water pump capable of circulating a coolant to match an engine speed by connecting a key so that a second stage impeller is rotated together with a first stage impeller.

The present invention as a means for achieving the above object,

In the impeller is inserted into the rotation shaft of the water pump to circulate toward the cylinder head by applying centrifugal force to the cooling water,

The first stage blade is formed on one side to apply the centrifugal force to the cooling water, and a plurality of receiving grooves are formed on the outer circumference of the shaft hole to accommodate the coupling means for coupling with the second stage impeller when the temperature of the cooling water is high temperature, so as to rotate together with the rotating shaft. A first stage impeller inserted into one end of the rotating shaft;

The outer diameter is larger than the outer diameter of the first stage impeller and a two stage blade is formed on one side to apply centrifugal force to the coolant, and a number of coupling holes are formed on the outer circumference of the shaft hole so as to be symmetrical with the receiving groove. A two-stage impeller axially coupled to the rotating shaft so as to be idle by;

When the engine is rotated at a high speed to increase the temperature of the coolant, the coupling means is operated to transfer the rotational force of the first stage impeller to the second stage impeller; Characterized in that consists of,

The coupling means is filled with one side of the first impeller receiving groove is characterized in that it is formed of a wax body that is expanded when the temperature of the cooling water rises, the rod is elastically supported by the spring to operate when the wax body is expanded.

1 is a cross-sectional view of a water pump constructed by the present invention.

Figure 2 is an enlarged cross-sectional view of the water pump impeller according to the present invention.

Figure 3 is an operating state of the impeller according to the present invention.

Figure 4 is a view for explaining the prior art.

5 is a cross-sectional view of a conventional water pump.

※ Explanation of code for main part of drawing

20: water pump 21: housing

22: axis of rotation 23: pulley

30: impeller 31: first stage impeller

32: 1st stage blade 33: receiving groove

35: two-stage impeller 36: two-stage blade

37: coupling hole 39: bearing

40: bonding means 41: wax body

42: rod 43: spring

DETAILED DESCRIPTION OF THE EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with the accompanying drawings.

1 is a cross-sectional view of a water pump constructed by the present invention, Figure 2 is an enlarged cross-sectional view of the water pump impeller according to the present invention, Figure 3 is an operating state diagram of the impeller according to the present invention, the reference numeral 20 shown in the drawing It is a water pump constructed by the invention.

The housing 21 of the water pump 20 is configured to be mounted on one side of the cylinder block by a bolt as in the prior art, the pulley 23 receiving the rotational force of the crankshaft in the center of the housing 21 The rotating shaft 22 is formed is coupled shaft. A bearing 24 for smooth rotation of the rotating shaft 22 is formed in the bearing portion of the housing 21, and a seal 25 is formed as in the related art to prevent cooling water from flowing out of the housing 21.

In addition, an impeller 30 is formed at one end of the rotating shaft 22 positioned inside the housing 21 to apply centrifugal force to the coolant. The impeller 30 is a one-stage impeller having a two-stage structure unlike the related art. 31) and a two-stage impeller (35).

One side of the first stage impeller 31 is formed with a first stage blade 32, the outer periphery of the shaft hole 34 is formed with a plurality of receiving grooves 33 for receiving the coupling means 40, the second stage impeller ( Two-sided blade 26 is formed on one side of the 35 and the coupling hole 37 is formed on the outer circumference of the shaft hole 38 to match the position of the receiving groove 33.

In particular, the shaft hole 34 of the first stage impeller 31 is fixed to the rotating shaft 22 and rotated together with the shaft, and the shaft hole 38 of the second stage impeller 35 has the rotating shaft with the bearing 39 mounted thereon. Axially coupled to (22).

And the coupling means 40 for coupling the first stage impeller 31 and the second stage impeller 35 has a wax body 41 which expands in volume when the temperature of the cooling water rises, and one side when the wax body 41 expands. It consists of a rod 42 which is movable. That is, the rod 42 is inserted into the receiving groove 33 of the first stage impeller 31 so as to be elastically supported by the spring 43, and then the wax body 41 is filled in the remaining space of the receiving groove 33 and the bolt ( 45), the airtightness of the wax body 41 is maintained.

Referring to the operation of the water pump equipped with an impeller configured as described above are as follows.

When the engine is warmed up or running at low speed, the temperature of the coolant circulating in the cylinder block is at a low temperature, so if the coolant is circulated too rapidly, the engine is overcooled to obtain proper output. However, in the impeller 30 of the water pump 20 constructed by the present invention, when the temperature of the cooling water is below a predetermined temperature, the rod 42 is removed from the coupling hole 37 as shown in FIG. 2, and the first stage impeller 31 is provided. ) Is driven to lower the cooling water circulation rate, thereby preventing the engine from being overcooled. At this time, in the case of the two-stage impeller (35), it is held by the bearing (39) so that it is idle and does not pump the coolant. Therefore, the coolant is circulated only by the first stage impeller 31 at the time of initial engine driving, and thus the cooling performance of the coolant is reduced, which enables fast warm-up of the engine, thereby generating harmful exhaust gas generated during initial engine driving. Can be suppressed as much as possible. This means that the activation temperature of a general catalyst should be about 350 ° C., since only one stage of the impeller 31 is driven, the cooling performance of the cooling water is lowered, so that the activation temperature of the catalyst can be reduced within a short time. will be.

And when the engine is running at high speed, the temperature of the cooling water circulating the cylinder block is a high temperature, the circulation of the cooling water must also be fast to prevent overheating of the engine. At this time, when the temperature of the coolant flowing through the cylinder block and flowing into the water pump 2 reaches a predetermined temperature or more, the volume of the wax body 41 filled in the receiving groove 33 is expanded, and the wax body (in a sealed space) As the 41 is expanded, the log 42 pushes the spring 43 and is pushed toward the coupling hole 37. As the rod 42 is gradually pushed while the first stage impeller 31 rotates, the end of the rod 42 is coupled to the coupling hole 37. That is, the two-stage impeller 35 is rotated together with the first-stage impeller 31, thereby applying a stronger centrifugal force to the cooling water, thereby increasing the cooling efficiency.

Therefore, the impeller 30 is rotated in one or two stages according to the operating speed of the engine, so that the engine is properly cooled and the engine is properly cooled according to the running speed, thereby increasing the combustion efficiency of the fuel and discharging it after the combustion of the fuel. It is possible to suppress the generation of harmful emissions.

The present invention as described above is equipped with a coupling means operating in accordance with the temperature of the cooling water to cool the engine to the first stage impeller to automatically operate the second stage impeller for more efficient cooling when the engine is running at high speed, Enough cooling to prevent overheating of the engine improves the combustion efficiency of the engine.In the initial start-up of the engine, the cooling efficiency of the coolant is lowered so that the catalyst is brought to the activation temperature (about 350 ℃) in a short time. There is a great advantage that can suppress the generation of harmful gas (Emission) as much as possible.

Claims (2)

In the impeller is inserted into the rotation shaft of the water pump to circulate toward the cylinder head by applying centrifugal force to the cooling water, On one side is formed a first stage blade 32 to apply the centrifugal force to the cooling water, the receiving groove 33 is accommodated for the coupling means 40 for engaging with the second stage impeller 35 when the temperature of the cooling water is high temperature shaft ( A plurality of first stage impellers 31 formed on an outer circumference of the 34 and inserted into one end of the rotating shaft 22 so as to rotate together with the rotating shaft 22; The outer diameter is larger than the outer diameter of the one-stage impeller 31 described above, and a two-stage blade 36 is formed on one side to apply centrifugal force to the coolant, and the coupling hole is symmetrical with the receiving groove 33 on the outer circumference of the shaft hole 37 ( 37 and a plurality of two-stage impeller 35 is axially coupled to the rotating shaft 22 to be idle by the bearing 39 on the outer surface of the first stage impeller 31; When the engine is rotated at a high speed to increase the temperature of the coolant, the coupling means 40 is operated to transfer the rotational force of the first stage impeller 31 to the second stage impeller 35; Impeller of the water pump, characterized in that consisting of. The method of claim 1, The coupling means 40 is filled on one side of the receiving groove 33, the wax body 41 is expanded when the temperature of the cooling water rises, and is elastically supported by the spring 43 to operate when the wax body 41 is expanded Impeller of the water pump, characterized in that formed by the rod 42.