JP5973715B2 - water pump - Google Patents

Description

  The present invention provides a casing having a ventilation hole for discharging steam and an inclined drain hole for discharging leakage water, and prevents intrusion of dust from the ventilation hole or intrusion of muddy water, etc. The present invention relates to a water pump that can extremely simplify a configuration in which a fixed amount is stored and only an overflow is discharged without being discharged at once.

  A water pump is used as a cooling device for an automobile engine. The water pump is usually equipped with a mechanical seal that watertightly partitions between the pump chamber in which the impeller is disposed and the bearing chamber in which the bearing with the shaft is mounted. However, even if a mechanical seal is attached, water slightly enters the bearing chamber side from the pump chamber.

  Therefore, leakage water and steam accumulate on the bearing chamber side, and if this leakage water accumulates, there is a possibility that the shaft bearing mounted in the bearing chamber is corroded. Therefore, a drain hole for discharging leaked water and a ventilation hole for exhausting steam generated from the leaked water are formed in the casing.

  Patent Documents 1 to 3 exist as an example of a casing of a water pump having such ventilation holes and drain holes. An outline of the configuration of Patent Document 1 will be described. In addition, in the following description, the code | symbol attached | subjected to the member uses what was described in patent document 1 as it is. Also, the reference numerals in FIGS. 6A and 6B showing the prior art are parenthesized to differentiate from the reference numerals of the present invention.

  First, mainly in Patent Document 1, a body 23 fixed to the mounting surface 33 of the engine block 22, a rotary shaft 27 supported by a central bore 24 of the body 23 via a bearing 28, and the rotary shaft 27 The impeller 29 is supported and forcibly supplies cooling water from the cooling water inlet 33 to the outlet 34.

  A water drain hole 36 is provided between the mechanical seal 32 and the bearing 28, and a water reservoir 35 communicating with the water drain hole 36 is provided in at least one of the engine block 22 and the body 23. When the body 23 is fixed to the mounting surface 33, the water reservoir 35 is in a watertight state.

  A drain port 37 is formed above the water reservoir 35 in the figure. The drain port 37 is also opened to the mounting surface 30 side of the engine block 22 and becomes a port that opens the water reservoir 35 to the outside by fixing the body 23 to the mounting surface 30. When the water reservoir 35 is full of water, the water leakage in the water reservoir 35 is discharged to the outside via the drain port 37, and the leakage leaked into the space in the central bore 24 between the water drain hole 36 and the mechanical seal 32 and the bearing 28. Prevent water filling. The water reservoir 35 is formed as a space-shaped casing with the periphery covered.

  A ventilation hole for discharging steam is provided above the central bore 24. And in patent document 1, when forming the ventilation hole and the drain hole 36 in the casing manufactured by casting, it drills from the position where the said ventilation hole is formed toward the position where the drain hole is formed, etc. Perforated. In the above processing, the ventilation hole and the drainage hole 36 are formed along a straight line so as not to break through the water reservoir 35 with a drill.

JP 2002-285998 A JP 2002-122100 A JP 2002-155546 A

  In Patent Document 1, since the ventilation hole and the drainage hole 36 are formed by the above-described cutting process, the ventilation hole has a structure in which the opening on the outer side is opened as it is above the central bore 24 as it is. For this reason, dust, dust, or the like enters from the opening of the ventilation hole, or water easily enters.

  Therefore, in order to prevent the intrusion of dust and dirt from the opening of the ventilation hole and the intrusion of water, the projecting portion 1f disclosed in Patent Document 2, the circumferential rib 7 disclosed in Patent Document 3, etc. It is also conceivable that a portion is formed, covers the opening of the ventilation hole, and has a hole passage that bends the ventilation hole into a substantially L shape so that dust, dust, water, etc. are difficult to enter.

  In the casing in Patent Document 1, when the ventilation hole and the drainage hole are cut using a drill or the like, since the water reservoir 35 exists, the drainage is performed from the ventilation hole forming side as described above. Drilling with a drill toward the hole 35 side. However, as shown in FIG. 6 (B), if portions corresponding to the projecting portion 1f (Patent Document 2) and the circumferential rib 7 (Patent Document 3) are provided, these become obstructive, and ventilation holes and drainage are removed. It is extremely difficult to cut (perforate) a hole, and practically impossible. Further, cutting (drilling) by a drill from the drain hole 35 side is naturally impossible because the water reservoir 35 is present (see FIG. 6B).

  Therefore, in Patent Document 1, since the cutting process by casting and drilling is possible, the ventilation hole is simply in a straight line and remains open above the central bore 24 [FIG. 6]. (See (A)). Thus, in patent document 1, the penetration | invasion of dust, refuse, etc. from a ventilation hole and the penetration | invasion of water will become an unavoidable thing. An object (technical problem to be solved) of the present invention is to provide a casing of a water pump that prevents intrusion of dust, dirt, etc. from the ventilation holes and intrusion of water, and has a drain hole and a water reservoir. It is to make it easy to manufacture.

  In view of this, the inventor has intensively and researched to solve the above problems, and as a result, the invention of claim 1 is orthogonal to the bearing boss portion in which the bearing chamber is formed and the axial direction of the bearing boss portion. In a casing comprising a pump housing part extending in the direction and having a seal chamber inside, the inside and outside of the casing are inclined with respect to the vertical direction when the casing is attached to equipment such as an engine. And an inclined drain hole that communicates with the reservoir, a water reservoir portion that is formed in the pump housing portion and communicates through an intersection at an intermediate position of the inclined drain hole, an inner side of the casing, and an upper upper portion of the casing. And a ventilation roof part covering the ventilation opening of the ventilation hole at a predetermined position above the outer surface of the bearing boss part, and the inclined drain hole and the ventilation hole are It is arranged in a straight line, the water reservoir section by which a water pump comprising positioned below the inclined water drain hole at the intersection edge part, the above-mentioned problems are eliminated.

  According to a second aspect of the present invention, in the first aspect, the water reservoir is a water pump in which a reservoir recess is formed below a lowermost position of the intersecting portion, thereby solving the above problem. According to a third aspect of the present invention, in the first or second aspect, the intersecting portion is a water pump configured so that a linear direction of the inclined drain hole penetrates the water pool portion. Settled. According to a fourth aspect of the present invention, in the first or second aspect, the intersecting portion is configured such that an inner peripheral side surface of the inclined drainage hole and a part of the water reservoir portion communicate with the water reservoir portion. The above problem was solved by using a water pump.

  In the invention of claim 1, a casing having a ventilation hole having a ventilation roof part, an inclined drainage hole, and a water pool part can be manufactured very easily. In particular, the casing can be manufactured only by casting, or can be easily performed by either casting or cutting by drilling. First, the inclined drain hole is configured to communicate the inside of the casing and the lower outside with an inclination. The water reservoir communicates with the inclined drain hole through the intersection.

  And when casting the casing with the mold, the water reservoir is formed in the cavity of the mold, and the molding pins for forming the inclined drain holes and ventilation holes can be inserted and removed freely in the mold It is set as the structure which can be attached to. By using such a mold, when the molding pin is pulled out of the mold in the process of casting the casing with the mold, the inclined drain hole and the ventilation hole are formed in a straight line, and the inclined water is formed by casting. A casing in which a ventilated roof, a vent hole, a water reservoir, a ventilation hole, and a ventilation roof covering the ventilation opening are integrally formed can be manufactured by a single casting.

  In addition, when a mold having no inclined drain hole or ventilation hole is used in the casing at the time of casting, the inclined drain hole is drilled with a drill or the like. In the present invention, even in such a case, the inclined drainage hole and the water pool portion communicate with each other by drilling the inclined water drain hole at a position where it intersects the water reservoir portion. Can do. At the same time, by forming the inclined drainage hole and the ventilation hole along a straight line from the position where the inclined drainage hole is formed with a drill, the ventilation roof part is not interfered with at all. An opening of a ventilation hole is formed in the part, and the opening can be structured to communicate with the outside through a ventilation roof part.

  In the invention of claim 2, the water reservoir is configured such that a reservoir recess is formed below the lowest end position of the intersection. With such a configuration, the water leaked from the pump housing portion into the bearing boss portion enters the water reservoir portion from the intersecting portion while flowing down the drain hole, and is temporarily stored in the reservoir recess portion of the water reservoir portion. Then, the water stored in the reservoir recess evaporates and disappears before it becomes full.

  Therefore, the leaked water in the casing is not exhausted entirely from the drain hole, but is temporarily stored in a water reservoir located in the middle of the drain hole, and is accumulated. Since the amount of water is very small, it almost evaporates and disappears. Therefore, leaked water is hardly discharged from the drain hole to the outside of the casing, and even if it is discharged, the amount is very small.

  According to a third aspect of the present invention, the intersecting portion is configured such that the linear direction of the drain hole penetrates the water reservoir portion, so that the water reservoir portion has the same diameter as the drain hole. As a result, the width of the intersecting portion can be maximized, and the leaked water can be reliably fed into the water reservoir.

  In the invention of claim 4, since the intersection portion is configured such that the inner peripheral side surface of the drain hole and a part of the water reservoir portion communicate with the water reservoir portion, the area of the intersection portion is reduced. Thus, the volume of the reservoir recess can be increased by that amount, and the storage capacity of leaked water can be increased. As a result, a large amount of leaked water is stored when the humidity is high such as in the rainy season or rainy weather, and the leaked water is difficult to evaporate, and the dripping of water from the drain hole can be prevented.

(A) is a front view of 1st Embodiment of this invention, (B) is Y1-Y1 arrow sectional drawing of (A), (C) is Y2-Y2 arrow sectional drawing of (B). (A), (B) is a vertical side view of the step of mold casting the casing in the present invention, and (C) is a vertical side view of the cast casing. (A) thru | or (C) are principal part sectional drawings which show the effect | action of a drain hole and a water reservoir. It is a principal part enlarged view of 2nd Embodiment of this invention. It is a principal part perspective view which shows a ventilation roof part and its vicinity. (A) And (B) is a vertical side view which shows a prior art.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. There are a plurality of embodiments of the present invention, and the first embodiment will be described first. It is mainly composed of a casing A, a shaft bearing 91, a mechanical seal 92, and an impeller 93 (see FIGS. 1A and 1B).

  The casing A is made of an aluminum alloy, but other materials may be used. In the present invention, the casing A on which the bearing 91 with shaft, the mechanical seal 92, and the impeller 93 are mounted is used as a pump alone with the casing cover A1, but without the casing cover A1, The casing A may be used by being directly attached to a predetermined position of a device such as an engine.

  As shown in FIG. 1B, the casing A includes a bearing boss portion 1 having a substantially hollow cylindrical shape and a pump housing portion 2 having a flat plate shape. The bearing boss portion 1 and the pump housing portion 2 are integrally formed. The bearing boss portion 1 is formed with a bearing chamber 11 surrounded by the inner peripheral side. In addition, a seal mounting chamber 21 in which a mechanical seal 92 is mounted is formed in the pump housing portion 2.

  A bearing portion of a bearing 91 with a shaft is mounted in the bearing chamber 11, and a mechanical seal 92 is mounted in the seal mounting chamber (see FIG. 1B). The shaft of the bearing 91 with the shaft penetrates the mechanical seal 92 while the outer peripheral side surface is sealed watertight by the mechanical seal 92. An impeller 93 is attached to one axial end of the shaft. Reference numeral 94 in the figure denotes a belt wheel attached to the shaft of the bearing 91 with shaft, and reference numeral 95 denotes a belt attached to the belt wheel 94.

  A gap chamber 3 is formed between the bearing chamber 11 of the casing A and the seal mounting chamber 21 (see FIGS. 1B and 2C). The gap chamber 3 is a space formed between the bearing portion of the bearing 91 with the shaft mounted in the bearing chamber 11 and the mechanical seal 92 mounted in the seal mounting chamber 21.

  In the casing A, an inclined drain hole 4 and a ventilation hole 5 are formed in an inclined state with respect to the horizontal or vertical direction of the extension direction of the pump housing part 2 [FIGS. 1A, 1C, FIG. 3, see FIG. Specifically, when the inclination angle θ of the inclined drain hole 4 is assumed to be a virtual axis La of the inclined drain hole 4, when it is attached in a proper state to a device such as an engine to which the water pump of the present invention is attached. The angle θ of the axis La of the drain hole 4 with respect to the vertical direction line L is about 30 to 60 degrees (see FIGS. 1A and 1C), and as an embodiment of the present invention Is about 45 degrees.

  The inclined drain hole 4 and the ventilation hole 5 are holes that penetrate the inside and the outside of the casing A, and the cooling that has leaked and accumulated in the gap chamber 3 formed between the mechanical seal 92 and the bearing 91 with the shaft. It serves to discharge water out of the casing A. The inclined drain hole 4 and the ventilation hole 5 are pipe-like holes penetrating the inner side and the outer side of the gap chamber 3 in the casing A, and both are linear holes. The ventilation holes 5 are formed on a straight line (including a substantially straight line) [see FIGS. 1A, 1B, 1C].

  A water reservoir 8 is formed in the pump housing 2 (see FIG. 1). The water reservoir 8 communicates with the inclined drain hole 4 through the intersection 41. Moreover, the water reservoir 8 is formed so as to be located immediately below the inclined drain hole 4 located on the upper side of the intersection 41 with respect to the position of the intersection 41 (FIG. 1C). reference〕. The intersecting portion 41 is a portion where the inclined drain hole 4 and the water reservoir portion 8 intersect, and leakage water flowing through the inclined drain hole 4 communicates with the water reservoir portion 8 via the intersecting portion 41. Yes.

  The water reservoir 8 is formed in the side wall of the mounting surface 23 of the pump housing portion 2 so as to be recessed in the axial direction, and a part thereof is an open surface along the side wall of the mounting surface 23 [FIG. )reference〕. That is, the water reservoir 8 constitutes a substantially closed space by directly joining the mounting surface 23 to the casing cover A1 or the engine housing.

  The water reservoir 8 has a reservoir recess 81 formed below the lowermost position of the intersection 41. The reservoir recess 81 is a portion that is recessed so as to be dug down below the pump housing portion 2. The reservoir recess 81 is formed below the lowest end position 41a of the intersection 41 and has a structure capable of storing a certain amount of water.

  Then, in the state where the water has accumulated in the reservoir recess 81, the water is almost evaporated and disappears before the reservoir recess 81 becomes full as shown in FIGS. Even if there is a case where water overflows from the reservoir recess 81, the amount is small, and this small amount of water is discharged from the inclined drain hole 4 to the outside of the casing A.

  The inclined drain hole 4 and the water reservoir 8 communicate with each other through the intersection 41, and the intersection 41 has two embodiments. First, in the first embodiment, as shown in FIG. 1C, the linear direction of the inclined drain hole 4 penetrates the both side surfaces of the water reservoir 8 in the vertical direction. . That is, the water reservoir 8 has an upper communication opening 8a and a lower communication opening 8b.

  Water enters from the upper communication opening 8 a and is stored in the concave portion 81 as it is. The water overflowing in the reservoir recess 81 flows from the lower communication opening 8b to the inclined drain hole 4 and is discharged from the casing A. Further, the communication opening 8 b on the lower side in the water reservoir 8 is at a position equal to the lowest end position 41 a of the intersection 41.

  In the second embodiment of the intersection 41, the inner peripheral side surface of the inclined drain hole 4 and a part of the water reservoir 8 communicate with the water reservoir 8. . In this embodiment, the linear direction of the inclined drain hole 4 does not penetrate the vertical direction of the water reservoir 8, but a part of the inclined water drain hole 4 in the diameter direction and a part of the water reservoir 8 are formed. It communicates so that it may mix.

  The intersection 41 of the second embodiment has a smaller area than the intersection 41 of the first embodiment, and an opening that communicates with the water reservoir 8 is formed on a part of the inner peripheral side surface of the inclined drain hole 4. It is a thing. Therefore, the water reservoir 8 has only one inlet / outlet opening 8 c communicating with the inclined drain hole 4. That is, as in the first embodiment, the upper communication opening 8a and the lower communication opening 8b do not exist.

  In the second embodiment, the lowermost edge of the entrance / exit opening 8c corresponds to the lowermost position 41a at the intersection 41. In the second embodiment, inflow and outflow of water are performed from the inlet / outlet opening 8 c between the inclined drain hole 4 and the water reservoir 8. A portion below the intersecting portion 41 of the inclined drainage hole 4 is used as a drain hole portion 42 (see FIGS. 1B and 1C). The drain hole 42 is a part of the inclined drain hole 4, and the diameter of the hole is the same between the inclined drain hole 4 and the drain hole 42.

  A ventilated roof portion 6 is formed outside the casing A [see FIGS. 1A and 1B]. The ventilation roof portion 6 is formed at a predetermined position above the outer surface of the bearing boss portion 1 and is formed so as to protrude along the axial direction of the bearing boss portion 1 from the pump housing portion 2 side. The ventilation roof 6 covers the ventilation opening 51 on the outside of the casing A of the ventilation hole 5 and on the discharge side of the ventilation hole 5 and also serves as a reinforcement of the casing A [FIG. 1 (A), ( See B)].

  The ventilated roof portion 6 is a substantially arch-shaped formation formed in a substantially halved pipe shape or a tunnel shape above the outer peripheral side surface of the bearing boss portion 1 [see FIG. 1 (A), FIG. 5 (A)]. ]. The ventilation opening 51 of the ventilation hole 5 further passes through the ventilation roof portion 6 and communicates with the outside of the casing A. The ventilated roof portion 6 serves to suppress intrusion of dust, dust, or water from the ventilation opening 51 of the ventilation hole 5 into the casing A.

  The rib 7 is formed in a plate shape and is formed so as to be continuously connected from the bolt mounting portion 22 formed on the outer peripheral edge of the pump housing portion 2 toward the diameter center of the bearing boss portion 1. Has been. The rib 7 is formed continuously with respect to the ventilated roof portion 6 and is formed at the top portion of the ventilated roof portion 6. The rib 7 and the ventilated roof portion 6 constitute one reinforcing rib.

  In the present invention, the casing A is cast and formed by the molds 100A and 100B and the forming pin 100C (see FIG. 2). Specifically, the molding pin 100C is detachably mounted on the mold 100A [see FIG. 2 (B)]. The forming pin 100C serves to form the inclined drain hole 4 and the ventilation hole 5 in the casing A.

  First, the molding pin 100C is inserted into the mold 100A through the insertion hole, and the mold 100B is joined to the mold 100A. Molten metal is poured into cavities inside the joined molds 100A and 100B [see FIG. 2 (A)]. After a predetermined time has elapsed, the forming pin 100C is removed from the mold 100A [see FIG. 2 (B)]. As a result, the casing A in which the inclined drain hole 4 and the ventilation hole 5 are integrally formed is manufactured (see FIG. 2C).

  In this casting, the inclined drain hole 4 and the water reservoir 8 that intersect with each other through the intersection 41 are formed at a time only by allowing the molding pin 100C to pass through the molding location of the water reservoir 8. It is something that can be done. Moreover, the ventilation opening 51 of the ventilation hole 5 and the ventilation roof part 6 are connected by setting so that the front-end | tip of the shaping | molding pin 100C may reach the ventilation roof part 6 shape | molded by casting of metal mold | die 100A, 100B. Can be made to structure.

  In addition, the molds 100A and 100B have a structure in which the molding pin 100C is not provided, and in the casting stage, only the casing A in which the drain hole 4 and the ventilation hole 5 are not formed is formed, and the casting molding of the casing A is completed. Later, the inclined drain hole 4 and the ventilation hole 5 can be formed by cutting with a drill. In this case, a drill is inserted from the position where the inclined drain hole 4 is formed, and drilling is performed toward the ventilation roof portion 6.

  Next, the operation of the drain hole 4 and the water reservoir 8 will be described. The water reservoir 8 is positioned below the inclined drain hole 4 with reference to the position of the intersection 41 with the inclined drain hole 4. In addition, a storage recess 81 is formed below the lowermost position 41a of the intersection 41.

  Therefore, the water leaked from the mechanical seal 92 mounted inside the pump housing portion 2 into the bearing boss portion 1 enters the water pool portion 8 from the intersection portion 41 while flowing down the inclined drain hole 4 and is stored. It is stored in the recess 81 [see FIG. 3 (A)]. In the state where water is accumulated in the reservoir recess 81, the water is almost evaporated as time passes and disappears before the reservoir recess 81 becomes full (see FIGS. 3B and 3C).

  Further, even if the water accumulated in the recess 81 overflows, the amount is very small, and this small amount of water is discharged from the inclined drain hole 4 to the outside of the casing A. However, in practice, almost no water is discharged. Therefore, the leakage of the leaked water from the drain hole 4 does not occur, and it is possible to prevent a misunderstanding due to a misunderstanding that a malfunction has occurred in the sealing device such as the mechanical seal 92 of the casing A. .

A ... casing, 1 ... bearing boss, 11 ... bearing chamber,
2 ... Pump housing part, 21 ... Seal chamber, 4 ... Inclined drain hole, 41 ... Intersection part,
5 ... Ventilation hole, 51 ... Ventilation opening, 6 ... Ventilation roof part, 8 ... Water reservoir, 81 ... Reservoir recess.

Claims (4)

A casing comprising a bearing boss portion having a bearing chamber formed therein and a pump housing portion extending in a direction orthogonal to the axial direction of the bearing boss portion and having a seal chamber inward. An inclined drainage hole that communicates with the lower part in a vertical direction when the casing is attached to a device such as an engine, and an inclined drainage hole that is formed in the pump housing portion and the inclined drainage hole. A water reservoir that communicates through an intersection at an intermediate location, a ventilation hole that communicates the inside and outside of the casing, and a ventilation opening of the ventilation hole at a predetermined position above the outer surface of the bearing boss. The inclined drainage hole and the ventilation hole are arranged in a straight line, and the water reservoir is located below the inclined drainage hole at the intersection. Water pump, characterized in that it is composed of.   2. The water pump according to claim 1, wherein the water reservoir has a reservoir recess formed below the lowest end position of the intersection.   3. The water pump according to claim 1, wherein the intersecting portion has a configuration in which a linear direction of the inclined drain hole penetrates the water pool portion.   3. The water pump according to claim 1, wherein the intersecting portion is configured such that an inner peripheral side surface of the inclined drain hole and a part of the pool portion communicate with the pool portion. .

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