JPH03225022A - Circulating circuit for cooling water - Google Patents

Abstract

PURPOSE:To prevent a large quantity of cooling water from unnecessarily flowing when a thermostat valve is opened, by providing a flow control valve having multiple radial notches from a small-diameter through hole in the suction side path of a water pump. CONSTITUTION:A flow control valve 8 made of an elastic sheet member 9 is provided in the suction path 7 of a circulating circuit of cooling water circulating the cooling water to a cooled section such as a cylinder block with a water pump 2. The flow control valve 8 has a through hole 10 with the diameter smaller than that of the suction path 7 at the center section and also has multiple notches 11 radially from the through hole 10. When the quantity of the cooling water flowing in the suction path 7 is large, tongue pieces 11a made by the notches 11 are bent, the area of the through hole 10 is increased, when the flow is small, the area of the through hole 10 is decreased to squeeze the cooling water. When a thermostat valve is opened, a large quantity of the cooling water is prevented from unnecessarily flowing, and the driving power of the water pump 2 can be prevented from being wasted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cooling water circulation circuit used for cooling engine cylinder blocks and the like.

[Conventional technology]

For example, in the conventional engine cooling water circulation circuit, the 15th
As shown in the figure, a suction pipe 3 of a water pump 2 that supplies cooling water to the cylinder block 1 is connected to the outlet side of a radiator 5 and a bypass circuit 6 via a thermostatic valve 4, and is connected to the bypass circuit 6 for cooling. When the water temperature is low, the water pump 2 circulates only a small constant flow of cooling water from the bypass circuit 6. When the temperature of this cooling water rises to a certain temperature or higher, the thermostat valve 4 is opened, and the cooling water from the cooling water passage passing through the radiator 5 flows into the suction pipe 3 of the water pump 2 and flows into the cylinder block 1. A large amount of cooling water is circulated.

The relationship with respect to changes in water temperature in this conventional example is shown in FIG.
1, a constant small amount of cooling water flows through the bypass circuit, the water temperature a reaches a predetermined temperature, and when the thermostat valve 4 is opened, it increases rapidly. The water pump driving horsepower C changes in proportion to the change in the circulating flow rate, and increases rapidly when the thermostatic valve 4 is open.

[Problems to be Solved by the Invention] In the conventional cooling water circulation circuit described above, the amount of water changes rapidly due to the opening and closing of the thermostat valve 4, and the water amount is relatively too high near the temperature T1 at which the thermostat valve 4 opens. Even when the water temperature is low, the opening operation of the thermostatic valve 4 results in an unnecessarily large flow of water, which causes a problem in that the water pump driving horsepower is wasted.

In addition, when the cooling water temperature is low, the thermostat valve 4 is closed and a constant amount of cooling water is circulated through the binox circuit 6. If it is necessary to raise the water temperature, the flow rate flowing through the circuit 6 may still be large, and it may take time to raise the water temperature.

The present invention has been made in consideration of the above-mentioned problem, and the amount of water when the thermostatic valve opens as the temperature of the cooling water rises changes in accordance with the rise in water temperature, and the thermostat valve opens. This prevents a large flow of cooling water from flowing unnecessarily when the thermostatic valve is closed, which prevents the water pump drive horsepower from being wasted.Also, when the thermostat valve is closed, the amount of circulating water changes depending on the temperature, and the water temperature It is an object of the present invention to provide a cooling water circulation circuit in which the amount of circulating water is small when the temperature is low, and the temperature of the cooling water can be quickly raised at low temperatures.

[Means to solve the problem]

In order to achieve the above object, a cooling water circulation circuit according to the present invention is provided in a cooling water circulation circuit in which a water pump circulates cooling water to a cooled part such as a cylinder block. , is made of an elastic sheet member such as rubber or plastic, and has a through hole in the center with a diameter smaller than the diameter of the passage on the suction side, and a plurality of notches radially extending from the through hole. It has a structure with a valve installed.

The sheet member constituting the flow control valve is made of a material that easily deforms as the temperature rises.

Further, a shape memory alloy may be embedded in the flexible deformable portion of the flow control valve made of the sheet member so that this portion flexibly deforms as the temperature rises.

Furthermore, the plurality of tongues formed by the notches of the flow rate control valve may be formed of a shape memory alloy that bends and deforms as the temperature rises.

[For production]

The amount of cooling water circulated by the water pump in the cooling water circulation circuit is controlled by a flow rate control valve.

In the flow rate control valve, when the flow rate flowing through the suction passage of the water pump is large, the tongue piece formed by the notch bends and the through hole area becomes large, and when the above flow rate is low, the through hole area becomes small and the valve is throttled. It will be done.

Further, the throttle resistance of the flow control valve changes depending on the temperature of the cooling water, and the throttle resistance decreases as the temperature increases.

[Example] An example of the present invention will be described based on FIGS. 1 to 13. In this embodiment, the same members as those in the conventional example shown in FIG. 15 are designated by the same reference numerals, and the explanation thereof will be omitted.

A flow control valve 8 is interposed in the suction passage 7 of the water pump 2. The flow rate control valve 8 is shown in FIGS. 1 to 3, and is configured to close the suction passage 7 with an elastic sheet member 9 made of rubber or plastic. The sheet member 9 has a through hole 10 having a diameter smaller than the diameter of the suction passage 7 in the center thereof, and a plurality of notches 11 are provided radially from the through hole 10 to form a plurality of tongue pieces 11a. The flow control valve 8 has its outer edge connected to the connecting flange 12a of the suction passage 7.
, 12b.

As mentioned above, the constituent material of the flow control valve 8 is made of rubber or plastic, and its flexibility changes slightly depending on the temperature, and as the temperature rises, it becomes a little softer and the elastic repulsive force becomes smaller. It is designed to be easily deformed.

The operation of the above configuration will be explained below.

In FIG. 10, when the cylinder block 1 is at a low temperature, the coolant temperature is low, so the thermostat valve 4 is closed, and the coolant is circulated through the bypass circuit 6 as shown by the dotted arrow in the figure. At this time, the water passing through the suction passage 7 of the water pump 2 is throttled by the flow control valve 8. For example, when the engine starts at low speed (idling), the rotation speed of the water pump 2 is low, so the water suction force is small, and the water temperature at this time is low, so the flow rate control valve 8
Due to the strong elastic repulsion force, the tongue piece 1 of the flow control valve 8
1a is difficult to open, and the amount of suction is reduced. Also, if the water temperature is low and the thermostat valve 4 does not open even when driving at high speed, the tongue piece 11a of the flow rate control valve 8 will not open as described above because the water temperature is low even if the rotation speed of the water pump 2 is high. Therefore, the amount of circulating water is also reduced and the driving horsepower of the water pump 2 is also reduced.

As the cooling water temperature rises, the temperature of the flow rate control valve 8 rises, which makes it a little softer and its elastic repulsive force becomes smaller, and the tongue piece 11a becomes easier to deform and its opening area gradually increases. Therefore, the amount of water passing through the bypass circuit 6 also gradually increases.

Then, when the temperature of the cooling water further increases and the thermostat valve 4 is opened, the bypass circuit 6 is closed and the entire amount of cooling water is circulated from the cylinder block 1 through the radiator 5.

At this time, the flow rate control valve 8 is pushed open by the water flow at this time as shown in FIG. The tongue piece 11a of the control valve 8 is not deformed into a fully open state, so the cooling water is throttled by the flow rate control valve 8.

When the cooling water gradually rises from this state, the flow control valve 8
The elastic repulsive force of the sheet member 9 gradually decreases, the degree of opening thereof also gradually increases, and the amount of circulating water gradually increases.

The relationship in the change in water temperature at this time is shown in Fig. 13, and as the water temperature a gradually increases, the amount of circulating water remains in a small amount range until the opening temperature of the thermostat valve 4 reaches T1. The amount of circulating water gradually increases until the amount of water exceeds T, and reaches a predetermined amount of circulating water after a predetermined time t has elapsed since the thermostat valve 4 was opened.

Further, the driving horsepower C of the water pump 2 at this time increases approximately in proportion to the amount of circulating water.

In the above embodiment, as shown in FIG. 10, the thermostat valve 4 is installed on the upstream side of the water pump 2. However, as shown in FIG. A valve 4 may also be provided.

Further, when the temperature of the cooling water is low, the flow rate control valve 8 sufficiently restricts the circulation amount, so that the bypass circuit and thermostat may be omitted as shown in FIG. 11.

As described above, the example in which the flow rate control valve 8 is constructed of a sheet member whose elastic repulsion force gradually decreases as the temperature rises has been described. Alternatively, the tongue piece 11a may be made of shape memory plywood, and its opening area may change depending on the temperature of the cooling water.

Figures 4 to 7 show examples of the implementation.
As shown in FIG. 5, a shape memory alloy 13 is embedded in the base of each tongue piece 11a so as to be deformed as the temperature rises. At this time, in order to speed up the response of the shape memory alloy 13 to the water temperature, the tongue piece 11 is
A hole 14 may be provided in a to expose the shape memory alloy 13 so that it comes into direct contact with the cooling water.

Furthermore, as shown in FIGS. 8 and 9, each tongue piece may be made of a shape memory alloy 15. At this time,
The tongue may be combined with other metals in the radial direction.

Note that the intervening position of the flow j1 control valve 8 is not limited to the suction passage 7 of the water pump 2, but also the circuit from the outlet side of the cylinder block 5 including the inlet side of the radiator 5 to the inlet of the water pump 2. Anywhere inside is fine.

〔Effect of the invention〕

According to the present invention, as the temperature of the cooling water rises, the amount of water when the thermostat valve opens changes in accordance with the rise in water temperature, and when the thermostat valve opens, the amount of water increases unnecessarily. Cooling water no longer flows, and water pump drive horsepower can be prevented from being wasted. Further, the amount of circulating water when the thermostat valve is closed changes depending on the temperature, and the amount of circulating water is small when the water temperature is low, so that the temperature of the cooling water can be quickly raised at low temperatures.

Furthermore, according to the present invention, the amount of circulating water at low temperatures can be reduced to a small amount using the flow rate control valve 8. Therefore, in the case of an engine cooling water circulation circuit, the conventionally used bypass circuit and thermostat valve can be reduced. It is also possible to abolish it.

Furthermore, since the flow rate control valve 8 is constituted by the elastic sheet member 9, the flow rate control valve can be interposed between the water pump 2 and the suction passage (inlet cover), so that the flow rate control valve can be inserted between the water pump 2 and the suction passage (inlet cover). The gasket that was conventionally used in this part can be used in place of the gasket inserted in the part, and the cost can be reduced.

[Brief explanation of drawings]

Figures 1 to 13 show embodiments of the present invention, with Figure 1 being a sectional view of the main parts, Figure 2 being a plan view of the flow control valve, and Figure 3 showing the deflection state of the flow control valve. The perspective view shown and FIGS. 4 to 9 show other embodiments, and FIGS. 4 and 5 are front views showing an example in which a shape memory alloy is embedded in the base of the tongue piece,
6 and 7 are cross-sectional views showing the working state, and FIGS. 6 and 7 are front views showing examples in which a part of the shape memory alloy is exposed, and cross-sectional views, FIGS. 8 and 9, are tongue pieces made of shape memory alloy It is a front view and a sectional view showing an example constituted by. 10 to 12 are cooling water circulation circuit diagrams, FIGS. 13 and 14 are explanatory diagrams of the relationship between the present invention and the conventional cooling water temperature, and FIG. 15 is a conventional cooling water circulation circuit diagram. 1 is a cylinder block, 2 is a water pump, 7 is a suction passage, 8 is a flow control valve, 9 is a seat member, 10 is a through hole, 11
is notched, 13 shape memory alloy.

Claims (4)

[Claims] (1) In a cooling water circulation circuit in which the water pump 2 circulates cooling water to parts to be cooled such as the cylinder block 1, a sheet member 9 made of elastic material such as rubber or plastic is installed in the passage on the suction side of the water pump 2. A flow control valve 8 having a through hole 10 having a smaller diameter than the suction side passage in the center and having a plurality of notches 11 radially extending from the through hole 10 is interposed therein. A cooling water circulation circuit featuring: (2) The cooling water circulation circuit according to claim (1), wherein the sheet member 9 constituting the flow control valve 8 is made of a material that easily deforms as the temperature rises. (3) The cooling water according to claim (1), characterized in that a shape memory alloy is embedded in the flexible deformable portion of the flow rate control valve 8 made of the sheet member 9 so that this portion flexibly deforms as the temperature rises. circulation circuit. (4) In the cooling water circulation circuit in which the water pump 2 circulates cooling water to parts to be cooled such as the cylinder block 1, the diameter of the suction side passage is placed in the center of the suction side passage of the water pump 2. The through hole 10 has a smaller diameter through hole 10 and a plurality of cuts 11 are provided radially from the through hole 10.
A plurality of tongue pieces 11a are constructed around the tongue piece 11a, and each tongue piece 11a
A cooling water circulation circuit characterized in that a flow control valve 8 is interposed therein by a shape memory alloy that bends and deforms as the temperature rises.