WO2010016157A1

WO2010016157A1 - Reservoir tank

Info

Publication number: WO2010016157A1
Application number: PCT/JP2008/065235
Authority: WO
Inventors: 哲次宮崎; 秀樹荒木
Original assignee: タイガースポリマー株式会社
Priority date: 2008-08-05
Filing date: 2008-08-27
Publication date: 2010-02-11
Also published as: JPWO2010016157A1

Abstract

Provided is a reservoir tank in which cooling water can be prevented from leaking out of an injection opening even if the tank is violently vibrated and in which the space efficiency is improved. In the reservoir tank connected to an engine cooling water system, a cylindrical water leakage prevention member (2) is secured integrally to the reservoir so as to extend from the lower end of the cooling water injection opening (12) toward the inside lower part of the tank. The lower end of the water leakage prevention member (2) is located at a position lower than the liquid level (L) when a predetermined amount of cooling water is injected into the tank. A through hole (23) for communicating the inside and the outside of the water leakage prevention member (2) with each other is provided in the water leakage prevention member (2) at a position higher than the liquid level (L).

Description

Reservoir tank

The present invention relates to a reservoir tank. In particular, the present invention relates to a reservoir tank that can prevent leakage of cooling water due to vibration of the tank.

An internal combustion engine such as an automobile is often provided with a cooling system that circulates cooling water. In these cooling systems, in order to cope with a volume change due to a temperature change of the cooling water and a decrease in the cooling water due to evaporation, Typically, a cooling water replenishment tank called a reservoir tank is provided. In such a reservoir tank, the inside of the reservoir tank is connected to the cooling system by a pipe or the like, and in order to prevent a change in the atmospheric pressure inside the reservoir tank accompanying the movement of the cooling water, the reservoir tank is provided with a cooling water inlet or an injection cap. Vent holes are often provided.

As such a reservoir tank, a technique as disclosed in Patent Document 1 is exemplified. In the technique of Patent Document 1, in order to prevent cooling water that undulates inside the reservoir tank from reaching the inlet or cap due to vehicle vibration or the like and leaking from the vent hole, the inlet is placed inside the tank. It is disclosed that a substantially disk-shaped inclined member is provided in the vicinity of the opening that opens toward the opening to prevent leakage of cooling water.

Patent Document 2 discloses a technique in which a cylindrical protective wall is integrally formed from the upper surface of the tank body toward the lower side inside the tank in a water reservoir used for a reserve tank or the like. In this technique, it is disclosed that the cooling water can be prevented from reaching the tank welded portion by the function of the defense wall.
JP 7-332087 A Utility Model Registration No. 2593104

However, in the reservoir tank described in Patent Document 1, when the vibration of the vehicle becomes intense, if the coolant that swells violently at the top of the tank so as to reach the tank wall reaches the inlet, it cannot be prevented from entering, resulting in cooling. There is a possibility that water may leak, and it has been desired to further improve the liquid leakage prevention property.

Further, in the reservoir tank described in Patent Document 2, the defense wall can prevent the coolant from reaching the weld, but can prevent water from reaching the coolant inlet and from the vicinity of the inlet. It wasn't. Further, in the reservoir tank described in Patent Document 2, the space defined by the outer surface of the defense wall and the inner surface of the tank accumulates air and cannot be filled with cooling water, so that space saving is required. It has been desired to further increase the space efficiency in the engine room of automobiles.

Accordingly, an object of the present invention is to provide a reservoir tank that can prevent cooling water from leaking from the inlet even when vibrated vigorously.
Another object of the present invention is to improve the space efficiency of the reservoir tank.

As a result of intensive studies, the inventor has attached a cylindrical water leakage prevention member integrally to the lower end portion of the cooling water inlet in the reservoir tank, and the lower end of the water leakage prevention member is lower than the cooling water level of the tank. It has been found that the above-mentioned problem can be solved by providing a through hole at a position above the liquid level of the water leakage preventing member while being on the lower side, and the present invention has been completed.

The present invention is connected to an engine cooling water system by a pipe to exchange the cooling water with the cooling water system, and a cap is attached to an upper end portion of a cylindrical cooling water inlet provided in an upper part of the tank. A reservoir tank provided with a vent hole in the vicinity for communicating with the outside air inside the tank, and a cylindrical water leakage prevention member is provided so as to extend from the lower end of the cooling water inlet toward the inside of the tank. The tank internal space and the outside are communicated with each other via the inlet internal space and the internal space of the water leakage prevention member, and the lower end of the water leakage prevention member is connected to the tank with a predetermined amount of cooling water. Penetrating the water leakage prevention member so that the inside and outside of the water leakage prevention member communicate with each other at a position above the liquid surface. A reservoir tank, characterized in that is provided.

In the reservoir tank of the present invention, it is preferable that the cross-sectional area of the internal space of the water leakage preventing member is substantially equal to the cross-sectional area of the internal space of the cooling water inlet.
In addition, the reservoir tank of the present invention is preferably one in which a preformed water leakage prevention member is insert-molded into a cooling water inlet with respect to a blown reservoir tank. Item 3).

According to the present invention, due to the action of the cylindrical water leakage preventing member, undulations are suppressed inside the water leakage preventing member, and water leakage is suppressed. Moreover, even if the undulations occur outside the water leakage preventing member, the water leakage preventing member can serve as a protective wall to prevent the wave from reaching the inlet and suppress the water leakage.
In addition, since the water leakage prevention member is provided with a through hole at a position above the intended liquid level, the cooling water can be put into the tank above the lower end of the water leakage prevention member, and the cooling water is retained. Capacity can be increased and space efficiency can be improved.

In addition, if the cross-sectional area of the inlet and the cross-sectional area of the water leakage prevention member are substantially equal, liquid leakage due to the ripples of the cooling water can be more effectively suppressed, and the injection of the cooling water into the reservoir tank can be efficiently performed. The operator can know the water injection level at the time of water injection.

When a preformed water leakage prevention member is integrated by insert molding for a blow-molded reservoir tank, the water leakage prevention member is secured while providing a highly liquid-tight tank body by blow molding. The reservoir tank of the present invention integrated with the lower end of the inlet can be provided efficiently and economically.

It is sectional drawing which shows embodiment of the reservoir tank of this invention. It is a fragmentary sectional view showing an embodiment of a reservoir tank of the present invention. It is a figure which shows the manufacturing process of the reservoir tank of this invention. It is a figure which shows the manufacturing process of the reservoir tank of this invention. It is a figure which shows the manufacturing process of the reservoir tank of this invention. It is sectional drawing which shows other embodiment of a water leak prevention member. It is sectional drawing which shows other embodiment of a water leak prevention member. It is sectional drawing which shows other embodiment of the reservoir tank of this invention. It is a partial sectional view showing other embodiments of a water leak prevention member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tank main body 11 Tank part 12 Inlet 2 Water leak prevention member 21 Cylindrical part 22 Flange 23 Through-hole 25 Baffle plate 30 Pipe 40 Cap 41 Ventilation hole 50 Cooling water 61 Air blowing nozzle 62 Blow molding die 70 Parison

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an embodiment of a reservoir tank of the present invention. The reservoir tank is configured by screwing a cap 40 fixed so that the pipe 30 penetrates into the cooling water inlet 12 of the tank body 1, and holds the cooling water 50 therein. The pipe 30 has its tip inserted into the cooling water 50 to the vicinity of the bottom surface of the tank body 1 and the other end connected to a circuit on the atmospheric pressure side via a pressure reducing valve of a cooling system circuit of the automobile engine. When the volume of the cooling water expands / shrinks due to an increase / decrease of the cooling water temperature, the cooling water 50 in the reservoir tank is exchanged so as to be supplied / returned to / from the cooling system so as to compensate for it.

The cap 40 is provided with a vent hole 41 that allows the internal space of the reservoir tank to communicate with the outside (atmosphere). Even if the cooling water in the reservoir tank increases or decreases due to the exchange of water with the cooling water system, air is exhausted / supplied so as to compensate for the ventilation holes 41, and the pressure in the reservoir tank is kept constant. It has come to droop. The vent hole 41 is not necessarily provided in the cap 40, and may be provided in the upper end portion of the inlet 12 of the tank body to which the cap 40 is screwed. In short, the vent hole 41 is provided in the vicinity of the cap attachment portion. Just do it.

FIG. 2 shows a cross-sectional view of the main part of the tank body 1. The tank body 1 includes a tank part 11 formed in a bag shape so as to store cooling water 50 therein, and an upper part from the upper end of the tank part 11. A separately formed water leakage preventing member 2 is joined and integrated with a member integrally formed with a substantially cylindrical injection port 12 provided so as to protrude. The water leakage preventing member 2 is a member formed in a cylindrical shape having a diameter substantially equal to that of the inlet 12. From the lower end of the inlet at which the inlet 12 is connected to the upper end surface of the tank portion 11, It is attached to extend toward. Therefore, the internal space of the tank and the outside are connected via the internal space of the water leakage preventing member 2 and the internal space of the inlet 12.

Here, the lower end portion 24 of the water leakage preventing member 2 is below the liquid level L when a predetermined amount of cooling water 50 is put in the reservoir tank, and the lower end portion 24 is immersed in the cooling water 50. The length is set. Furthermore, the inner side and the outer side of the water leakage preventing member 2 are communicated with the cylindrical portion 21 of the water leakage preventing member 2 at a position above the liquid level L (particularly in the vicinity of the connecting portion with the tank upper surface). A through-hole 23 having a circular cross section is provided. Further, a flange 22 is provided at the upper end of the water leakage preventing member 2 so as to expand outward in the radial direction, and the inlet 12 is formed so that the flange 22 meshes with the lower end of the inlet 12. Thus, the water leakage preventing member 2 is joined and integrated with the inlet 12.

The tank portion 11 and the injection port 12 are made of a thermoplastic resin that is not affected by the cooling water 50, such as polyethylene resin (PE) or polypropylene resin (PP). The water leakage preventing member 2 may be made of a thermoplastic resin that is not affected by the cooling water 50, such as polyethylene resin (PE) or polypropylene resin (PP), or a metal plate such as a plated steel plate. Also good.

The reservoir tank manufacturing method of the present invention can be performed, for example, as follows. First, the cylindrical water leakage preventing member 2 having the through holes 23 is manufactured in advance by plastic working of a metal plate, injection molding of a thermoplastic resin, or the like. Next, while integrally forming the tank portion 11 and the water injection port 12 by blow molding, the water leakage preventing member 2 is joined and integrated by insert molding. Hereinafter, the process will be described with reference to FIGS. In the following steps, the reservoir tank is molded in such a posture that the inlet is on the lower side, that is, in a posture that is upside down when in use. First, as shown in FIG. 3, the water leakage preventing member 2 is temporarily held at the tip of the air blowing nozzle 61 with the

molds

62, 62 of the blow molding apparatus being opened. The temporary holding may be performed by using the elastic force of the member. In this state, a semi-molten cylindrical parison 70 is pushed out so as to surround the nozzle 61 and the water leakage preventing member 2 (FIG. 4), and the

molds

62 and 62 are closed. By closing the mold, the flange portion 22 provided on the water leakage preventing member 2 is surrounded by the semi-molten parison, and the water leakage preventing member 2 is joined and integrated with the water inlet 12. After closing the mold, air is blown from the nozzle 61 to expand the parison (FIG. 5), and the tank portion 11 and the water inlet 12 having a shape corresponding to the inner surface shape of the

molds

62 and 62 are integrally formed. A tank in which the tank part 11, the water inlet 12 and the water leakage preventing member 2 are firmly integrated by cooling after the expansion, opening the mold, pulling out the molded parts upward, and deburring. The main body 1 can be obtained.

The operational effects of the reservoir tank of the present invention will be described. In the present invention, the water leakage prevention member 2 having a length that reaches the predetermined coolant level L is integrated with the inlet 12, so that even if severe vibration is applied to the reservoir tank, the passage of the reservoir tank is prevented. Water leakage from the pores 41 is suppressed. That is, on the outside of the water leakage preventing member 2, even if the liquid level may swell violently due to the interaction between the vibration and the tank wall surface, on the inside of the water leakage preventing member 2 directly connected to the inlet, The liquid level is kept calm and the cooling liquid is prevented from reaching the vent hole 41. Further, even if the liquid level violently swells outside the water leakage preventing member 2, the water leakage preventing member 2 works as a protective wall and prevents the coolant from reaching the vent hole 41.

According to the present invention, since the through hole 23 is provided in the cylindrical portion 21 of the water leakage preventing member 2, the space efficiency of the reservoir tank can be increased. That is, when the through hole 23 is not provided, when the coolant level L reaches the lower end of the cylinder part 21 when water is poured into the tank, the outer surface of the cylinder part 21, the upper inner surface of the tank part 11, and the liquid level. Since the space S surrounded by L becomes a closed space, cooling water cannot be injected any more. Therefore, if there is no through hole 23, the space above the tank portion 11 cannot be used effectively, and a sufficient cooling water capacity cannot be secured. On the other hand, according to the present invention, the space S and the internal space of the inlet 12 and the water leakage prevention member 2 communicate with each other through the through hole 23, so that air accumulated in the space S is exhausted from the through hole 23. As a result, the cooling water can be filled into the space S up to the height at which the through hole 23 is provided. Therefore, according to the present invention, the cooling water can be filled up to the vicinity of the upper end of the tank portion 11, a large amount of cooling water can be stored, and the space utilization efficiency is high.

Therefore, in the present invention, the through hole 23 provided in the cylindrical portion 21 of the water leakage preventing member 2 is below the upper end surface of the tank portion 11 and is a liquid level when a predetermined amount of cooling water is introduced. It is preferable to be provided on the upper side or at a height equal to the liquid level, and on the side closer to the upper end surface of the tank portion 11 in the cylindrical portion 21.

In order to further enhance the effect of suppressing water leakage, it is preferable that the through hole 23 provided in the cylindrical portion 21 of the water leakage preventing member 2 has a small diameter, preferably 5 mm or less. In addition, it is preferable that the through hole is provided so as to be inclined downward in a substantially horizontal direction or from the outside to the inside of the water leakage preventing member 2 in order to further enhance the effect of suppressing water leakage.

Furthermore, as an embodiment of the present invention, it is preferable that the cross-sectional area of the internal space of the cylindrical water leakage preventing member 2 is provided so as to be substantially equal to the internal space cross-sectional area of the inlet 12. Here, the cross-sectional areas of both are substantially equal means that one has a relationship of 30% to 300% of the other, more preferably 50% to 200%, and still more preferably 70% to 150%. By making the cross-sectional area of the cylindrical water leakage prevention member 2 so as to make the size of the internal space of the water leakage prevention member 2 sufficiently smaller than the size of the internal space of the tank portion 11. It is possible to more reliably suppress the liquid level from violently flowing inside the water leakage preventing member 2.

In addition, since the cross-sectional area of the cylindrical water leakage prevention member 2 is substantially equal to the cross-sectional area of the inlet 12, the cooling water does not stagnate at the portion of the water leakage prevention member 2 when water is poured. Water injection can be performed efficiently. In addition, since the cross section of the water leakage preventing member 2 is smaller than the cross sectional area of the tank portion 11, when the water is poured and the liquid level reaches the lower end of the water leakage preventing member 2, the water leakage preventing member The liquid level suddenly rises inside the inlet 2 and the inlet 12 so that the water injection operator can know that the cooling water has entered the lower end of the water leakage preventing member 2. In the present invention, the liquid level once rising inside the water leakage prevention member 2 is then lowered as the air in the space S is discharged from the through hole 23, and the water leakage prevention member as shown in FIG. The inner side and the outer side of 2 are settled in the same level.

The size of the water leakage preventing member 2 and the water injection port 12 is determined so that water can be easily injected and the cap 40 can be easily attached. Usually, the diameter is about 20 mm to 50 mm. A preferable size of the through hole 23 is 1 mm to 10 mm in diameter, and is determined so as to have a cross-sectional area of about 1/1000 to 1/4 of the cross-sectional area of the water injection port 12 or the water leakage preventing member 2. By changing the size of the through-hole 23, it is possible to adjust the water injection level detectability and the water injection efficiency.

As described above, the reserve tank of the present invention can be manufactured by inserting the preformed water leakage preventing member 2 so as to be integrally joined to the cooling water inlet 12 and then blow-molding the tank body. preferable. According to such a manufacturing method, the hollow tank portion 11 having a complicated tank shape, the water injection port 12, and the water leakage preventing member 2 extending toward the inside lower side of the tank are integrally formed, and the water leakage A reserve tank having a very complicated shape in which the through hole 23 is provided in the cylindrical portion 21 of the prevention member 2 in a substantially horizontal direction can be manufactured reliably and efficiently.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, The thing which added various modification | change is included in the range which does not change the property largely.

For example, the tube portion 21 of the water leakage preventing member 2 is not limited to a cylindrical shape, and may be a square tube having a square cross section, for example. Moreover, the cylinder part 21 is not necessarily limited to what has a uniform cross section, For example, the cross section may change to an axial direction, such as becoming a taper shape.

Moreover, in the said embodiment, although the cylindrical part 21 of the water leak prevention member 2 demonstrated what was a cylindrical shape by which the upper end and the lower end part were open | released, as shown in FIG.6 and FIG.7, as shown in FIG. It is also a preferred embodiment to provide a baffle plate 25 at the lower end or the middle of 21. The baffle plate 25 is a disk-shaped member provided with a through-hole for passing the pipe 30 in the center, and is integrally formed inside the cylindrical portion 21. By providing the baffle plate 25, it is possible to suppress the liquid level change inside the water leakage preventing member 2 and the cooling water from splashing upward, so that the water leakage can be more reliably suppressed. In addition, provision of the baffle plate 25 at the center portion or the lower end portion of the cylindrical portion facilitates temporary holding during insert molding.

In addition, the shape of the through hole 23 provided in the water leakage preventing member 2 is not limited to a circular hole, and may be an elliptical shape, an elliptical shape, a slit shape, a square hole shape, or the like. For example, as shown in FIG. 9, it is good also as the slit-shaped through-hole 23 which follows the axial direction of the cylinder part 21 of the water leak prevention member 2. As shown in FIG. If the slit reaches the lower end portion of the cylindrical portion 21 as a slit-like through hole, it is convenient to manufacture the water leakage preventing member 2 by resin injection molding. In addition, when making a through-hole into an ellipse shape or a slit shape, as shown in FIG. 9, while making the longitudinal direction follow the axial direction of the cylinder part 21, the penetration direction of the through-hole 23 is a cylinder part. It is preferable that a predetermined angle θ is formed with the radial direction of 21 and the through hole is provided in a direction along the inner peripheral surface of the cylindrical portion 21. The angle θ is set to 20 ° to 70 °, more preferably 30 ° to 60 °. By providing the angle θ, the undulating cooling water that tries to enter the inside of the water leakage preventing member 2 from the slit-like through hole 23 is changed in the direction along the inner periphery of the cylindrical portion 21. It is possible to more effectively prevent the cooling water from reaching the cap portion.

Moreover, the manufacturing method of the reserve tank of this invention is not limited to the said insert blow molding method, You may be based on another manufacturing method. For example, the reserve tank may be manufactured by integrating a half-cracked body formed by injection molding into a half-crack shape in the vertical direction by heat welding or adhesion. For example, as shown in FIG. 8, after the water injection port 12 and the tank portion 11 are integrally formed by blow molding, a separately manufactured water leakage preventing member 2 ′ is inserted and fixed in the water injection port 12, thereby The reserve tank may be manufactured. As in this embodiment, a part of the water leakage preventing member 2 ′ may be fitted inside the water inlet 12. In addition, it is preferable to provide a protrusion, a stopper or the like on the outer peripheral surface of the water leakage preventing member 2 ′ in order to prevent the member from falling off.

The reserve tank of the present invention can be used, for example, as a reserve tank for a cooling water system of an automobile engine, and can suppress water leakage from a vent hole even when severe vibration is applied. The space utilization efficiency is high because it can be satisfied, and the industrial utility value is high.

Claims

A pipe is connected to the engine cooling water system to exchange cooling water with the cooling water system, and a cap is attached to the upper end of the cylindrical cooling water inlet provided in the upper part of the tank. A reservoir tank provided with a vent hole communicating with the outside air,
A cylindrical water leakage prevention member is integrally attached so as to extend downward from the lower end of the cooling water inlet to the inside of the tank, and the tank inner space and the outside are connected to the inlet inner space and the water leakage prevention member. In addition to being contacted through the internal space,
The lower end of the water leakage preventing member is positioned below the liquid level when a predetermined amount of cooling water is put into the tank,
The reservoir tank is characterized in that the water leakage preventing member is provided with a through hole that communicates the inside and the outside of the water leakage preventing member at a position above the liquid level.
2. The reservoir tank according to claim 1, wherein a cross-sectional area of the internal space of the water leakage preventing member is substantially equal to a cross-sectional area of the internal space of the cooling water inlet.
The water tank according to claim 1 or 2, wherein a preformed water leakage prevention member is integrally attached to a cooling water inlet by being molded to a blown reservoir tank. Reservoir tank.