JP4687051B2 - Water pump - Google Patents

Description

  The present invention relates to a water pump, and more particularly to a water pump including a reservoir portion that temporarily stores cooling water so that cooling water leaked from a mechanical seal does not enter a bearing.

  In this type of water pump, the first and second housings that are joined to each other to form a vortex chamber and the rotating shaft supported by the first housing via a bearing are accommodated in the vortex chamber. The first housing includes an impeller and a seal provided between the impeller and the bearing, and a water drain hole is formed in the first housing in the space between the seal and the bearing. There is a type in which a reservoir for storing water flowing down from the other end side of the hole is provided, and a drainage passage is provided at a predetermined height portion of the reservoir (see, for example, Patent Document 1).

As another water pump, a pump unit for discharging cooling water for cooling the engine by rotating the drive shaft, a housing for rotatably supporting the drive shaft via a bearing, and a housing are attached. A pump chamber constituting member that constitutes the pump part, a seal member that is provided between the drive shaft and the housing and prevents the coolant from entering the bearing from the pump part, and between the seal member and the bearing. There is a water pump configured with a water reservoir portion in which water vapor generated in an axial space flows and accumulates, wherein the water reservoir portion is formed between a pump chamber constituent member and a housing (for example, see Patent Document 2).
JP 2002-364585 A JP 2003-155930 A

  However, since the water pump described in Patent Document 1 forms a pool portion by combining the mating surfaces of the first housing and the second housing, it is necessary to process the mating surfaces with high accuracy and increase the cost. Moreover, since it is necessary to provide a reservoir part outside the vortex chamber, and the pump becomes large, it may interfere with other mounting devices and be restricted by mounting conditions.

  In addition, the water pump described in Patent Document 2 includes a pump chamber constituent member for forming a water reservoir, a fastening component for fastening them, a seal component for preventing leakage from a joint surface between the housing and the pump chamber constituent member, and the like. And the number of parts increases.

  Also, there is a type in which a hole is formed in the body, and a reservoir is formed by assembling a plug as a separate member in the hole. This water pump also requires an assembling process such as plug press-fitting, which increases manufacturing costs.

  Therefore, the present invention has been made in view of the above problems, and in the water pump, a reservoir for temporarily storing cooling water leaked from the mechanical seal is formed with a simple configuration, and the pump is formed by the reservoir. The technical problem is to realize an inexpensive water pump without increasing its size.

In order to solve the above-mentioned problem, the technical means taken in the invention of claim 1 includes a bearing inserted in a bearing hole provided in a body forming a water chamber , and one end of a rotating shaft supported by the bearing. An impeller accommodated in the water chamber, a mechanical seal provided between the impeller and the bearing, a space formed between the mechanical seal and the bearing, and the space And a reservoir that stores cooling water that leaks from the mechanical seal into the space and releases steam-like cooling water to the outside air, wherein the reservoir is in the body. The concave portion formed and opened in the bearing hole is closed by the outer peripheral surface of the bearing .

According to this means, it is possible to form the reservoir portion by using a member existing. For this reason, the number of parts can be reduced, and a simple configuration can be achieved. Moreover, an assembly process is not added.

Further , according to this means, the reservoir is formed in the body, and the recess opened in the bearing hole is closed by the outer peripheral surface of the bearing, so that the reservoir is formed in the body and Can be placed next to each other. For this reason, a pump can be reduced in size and mounting property can be improved.

In order to solve the above problems, the technical means taken in the invention of claim 2 is that the concave portion is opened circumferentially in the bearing hole.

  According to this means, since the concave portion is circumferentially opened in the bearing hole, the concave portion can be formed by continuously processing the circumferential shape in the bearing hole, and the concave portion can be easily formed.

According to the present invention, it is possible to form the reservoir portion by using a member existing. For this reason, the number of parts can be reduced, and a simple configuration can be achieved. Moreover, an assembly process is not added.

Further , according to the invention of claim 1 , the reservoir is formed in the body, and the recess formed in the bearing hole is closed by the outer peripheral surface of the bearing, whereby the reservoir is formed in the body. It can be placed adjacent to the bearing hole. For this reason, a pump can be reduced in size and mounting property can be improved.

According to the second aspect of the present invention, since the recess is circumferentially opened in the bearing hole, it can be formed by continuously processing the recess in the bearing hole in the circumferential shape, and the recess is easily formed. it can.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The water pump 1 rotates the impeller 23 accommodated in the water chamber 91 to suck in the cooling water and pressurize and discharge the cooling water.

  In FIG. 1, the body 10 is fixed to a cylinder block 90 by a fixing member (for example, a bolt) to form a water chamber 91. The body 10 is provided with a bearing hole 11. A bearing 20 is inserted into the bearing hole 11, and a rotating shaft 21 is rotatably supported by the bearing 20. A driving pulley 22 is fixed to one end of the rotating shaft 21 by press fitting, and a rotational driving force from the outside is transmitted to the rotating shaft 21 through the driving pulley 22. An impeller 23 is fixed to the other end of the rotating shaft 21 by press-fitting, and the impeller 23 rotates by the rotation of the rotating shaft 21. An annular mechanical seal 40 is disposed between the impeller 23 and the bearing 20. A space 50 is formed between the mechanical seal 40 and the bearing 20. Water droplets (cooling water) in the form of vapor leak from the water chamber 91 accommodated in the impeller 23 into the space 50 through the mechanical seal 18.

  In the body 10, a recess 12 is formed in the bearing hole 11 so as to open in the circumferential direction. The recess 12 is formed in an annular groove shape. For this reason, the recessed part 12 can be processed and formed continuously, and can be formed easily. When the bearing 20 is inserted into the bearing hole 11, the outer peripheral surface 24 of the bearing 20 closes the recess 12 and forms a reservoir 30.

  The body 10 is formed with a drain hole 70 and a discharge hole 60 communicating from the space 50 to the reservoir 30. The drain hole 70 mainly discharges the steam-like cooling water in the space 50 to the reservoir 30 obliquely upward. The discharge hole 22 mainly discharges the water droplet-shaped cooling water in the space 50 to the reservoir 30 obliquely downward. A vapor vent hole 80 communicating with the outside air is formed in the upper part of the reservoir 30. The vapor in the reservoir 30 can be prevented from being released to the outside air and stored in the reservoir 30 through the vapor vent hole 80.

  Further, the cooling water stored in the form of water droplets in the reservoir 30 becomes steam due to heat generated by the engine or the like during engine operation. This steam moves upward along the outer periphery 24 of the bearing 20 in the reservoir 30, or moves upward of the reservoir 30 through the drain hole 60, the space 50 and the discharge hole 70, and the steam vent hole 80. Through the atmosphere. In this case, since the steam can move smoothly upward along the outer periphery 24 of the bearing 20, the steam (cooling water) discharge performance is improved.

  Next, the operation of the water pump 1 will be described.

  In the water pump 1, the drive pulley 22 and the rotary shaft 21 are integrally driven via a belt 25 that is applied to the drive pulley 15 as the external drive source rotates. When the rotary shaft 21 is driven, the impeller 23 that rotates integrally with the rotary shaft 21 rotates in the water chamber 91, sucks cooling water into the water chamber 91, pressurizes it, and discharges it. Is supplied.

  At this time, vapor-like cooling water leaks into the space 50 through the mechanical seal 40, and the vapor-like cooling water is mainly discharged to the outside air through the discharge hole 70, the reservoir 30, and the steam vent hole 80. . On the other hand, the water droplet-shaped cooling water is led to the reservoir 30 mainly through the lower discharge hole 60. The water droplet-shaped cooling water guided to the reservoir 30 becomes steam due to heat generated by the engine or the like during engine operation. The steam moves along the outer periphery 24 of the bearing 20 to the upper side of the reservoir 30 and is discharged to the outside air through the steam vent hole 80.

It is sectional drawing of the water pump in embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Water pump 10 ... Body 11 ... Bearing hole 20 ... Bearing 21 ... Rotary shaft 24 ... Outer peripheral surface 23 ... Impeller 30 ... Reservoir 40 ... Mechanical Seal 50 ... Space 91 ... Water chamber

Claims (2)

A bearing inserted into a bearing hole provided in the body forming the water chamber;
An impeller provided at one end of a rotating shaft supported by the bearing, and housed in the water chamber;
A mechanical seal provided between the impeller and the bearing;
A space formed between the mechanical seal and the bearing;
In the water pump comprising: a reservoir that communicates with the space, stores cooling water that leaks from the mechanical seal to the space, and discharges steam-like cooling water to the outside air;
The reservoir is a water pump formed in the body and having a recess opened in the bearing hole closed by an outer peripheral surface of the bearing . The recess, the water pump according to claim 1 that has been opened circumferentially in the bearing hole.

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