JPS6035825Y2 - temperature sensitive valve - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a temperature-sensitive valve used in a cooling device for an automobile engine, and more particularly to a temperature-sensitive valve used in a bottom-bypass type cooling device.

The temperature-sensitive valve used in bottom bypass type cooling equipment is
a valve housing generally defining first and second inlet ports and an outlet port and a valve chamber communicating with the ports;
a first valve element 30 disposed within the valve chamber to control the opening of the first inlet port; and a second valve element 30 disposed within the valve chamber to control the opening of the second inlet port 20. and a valve element, which is arranged in the valve chamber and is sensitive to the temperature of the fluid in the valve chamber, and drives the first valve element in the opening direction and the second valve element in the closing direction as the temperature rises. The first inlet port is connected to a coolant outlet port of the radiator, the second inlet port is connected to a coolant outlet port of the engine via a coolant bypass passage, and the outlet port is connected to a coolant outlet port of the engine via a coolant bypass passage. Each is connected to the inlet of the pump.

In a temperature-sensitive valve as described above, when the cooling water temperature is low, the first valve element closes the first inlet port, and the second valve element opens the second inlet port to direct the cooling water to the radiator. When the cooling water temperature is higher than a predetermined value, the first valve element opens the first inlet port, and the second valve element opens the second inlet port. Closed, the cooling water is routed through the radiator to the cooling water pump without flowing to the bypass passage, which speeds up the rise in cooling water temperature during warm-up and also keeps the cooling water temperature substantially constant. It looks like this.

In this case, it is preferable that the temperature sensing element is not affected by the temperature of the cooling water on the radiator side until the temperature of the cooling water reaches a predetermined value, and operates in response only to the temperature of the cooling water flowing through the bypass passage. .

Otherwise, the temperature sensing element will be affected by the temperature of the cold cooling water on the radiator side, and the temperature sensing valve will not operate even if the temperature of the cooling water flowing through the engine cooling water passage reaches a predetermined value.
Cooling water will not flow to the radiator, which may cause the engine to overheat.

This becomes especially noticeable in winter when the temperature is low in cold regions and the temperature of the cooling water on the radiator side is low.

However, in many conventional temperature-sensitive valves, there is an annular valve element directly attached to one end of the temperature-sensing element, and a port on the radiator side at the end of the temperature-sensing element. Since the temperature sensing element is closed, the cooling water from the radiator comes into direct contact with a portion of the temperature sensing element, and the temperature sensing element is influenced to some extent by the temperature of the radiator cooling water.

Conventionally, to deal with this, in addition to the cooling water from the bypass passage, return cooling water from the heater for heating the vehicle interior is guided to the temperature-sensing surface of the temperature-sensing element. This reduces the influence of the temperature of the cooling water on the radiator side.

In view of the above-mentioned problems with conventional temperature-sensitive valves, the present invention proposes that the temperature-sensitive valve is substantially influenced by the temperature of the fluid appearing at the first inlet port, such as the temperature of the cooling water on the radiator side. The purpose of the present invention is to provide a temperature-sensitive valve that is improved to operate without any problems.

According to the present invention, the first inlet port receives the cooling water discharged from the engine water jacket through the radiator, and the second inlet port receives the cooling water discharged from the engine water jacket bypassing the radiator. an inlet port, a valve chamber provided between the first and second inlet ports, an outlet port opening into the valve chamber, and a first valve element that controls opening and closing of the first inlet port. a second valve element for controlling the opening and closing of the second inlet port; and a second valve element disposed within the valve chamber to close the first inlet port when the temperature is low in response to a temperature to which it is sensitive. a temperature sensing element driving the first and second valve elements to open the first inlet port and close the second inlet port when the temperature is high;
Extending around and surrounding the temperature-sensitive surface of the temperature-sensing element, the flow of cooling water flowing into the valve chamber through the first inlet port is diverted from the temperature-sensing surface and into the valve chamber through the second inlet port. It is closely related to a temperature-sensitive valve characterized in that it has an annular wall element that guides a flow of cooling water flowing into the temperature-sensitive surface toward the temperature-sensitive surface, and a guide element that has a hole that communicates the inner and outer spaces it partitions. .

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.

The attached FIG. 1 is a schematic diagram showing one embodiment of an engine cooling system incorporating a temperature-sensitive valve according to the present invention.

In the figure, 1 indicates an engine, and the engine 1 includes a cylinder head 2 and a cylinder block 3, each of which has a cooling water passage 4.5 formed therein.

The engine 1 has a cooling water inlet port 6 communicating with the cooling water passage 5 and a cooling water outlet port 7 communicating with the cooling water passage 4. The cooling water supplied to the cooling water inlet port 6 is supplied to the cooling water passage. 5 and 4 to flow to the cooling water outlet port 7.

The cooling water inlet port 6 is connected to a discharge port 9 of a cooling water pump 8 via a cooling water passage 10 .

The cooling water pump 8 is drivingly connected to a crankshaft (not shown) of the engine 1, and is driven thereby.

The cooling water outlet port 7 is connected to the cooling water passage 11 and the cooling water conduit 1.
2 to a cooling water inlet port 14 of a radiator 13, and the radiator is connected at its cooling water outlet port 15 to one inlet port 18 of a temperature-sensitive valve 17 via a cooling water conduit 16.

Further, a bypass passage 19 is formed by branching from the middle of the cooling water passage 11, and this bypass passage 19 is connected to another inlet port 20 of the temperature-sensitive valve 17.

The temperature-sensitive valve 17 is connected to an inlet 22 of the cooling water pump 8 at one outlet port 21 thereof.

FIG. 2 shows one embodiment of the temperature-sensitive valve 17 on an enlarged scale.

Temperature sensitive valve 17 has a valve housing 24 defining inlet ports 18, 20, outlet port 21, and a valve chamber 23 communicating with each of these ports.

Further, another inlet port 39 is formed in the valve housing 24 to take in return cooling water from the heater for heating the passenger compartment.

A frame 25 is fixed to the valve chamber 23, and a temperature sensing element 26 is arranged inside the frame 25.

The temperature sensing element 26 is fixed to the frame 25 by its piston rod 27, and when a thermally expandable substance 29 such as wax sealed in the case 28 thermally expands, the case 28 moves upward in the figure. ing.

An annular valve element 30 is attached near one end of the case 28 .

The valve element 30 opens and closes the inlet port 18 in cooperation with an annular valve seat portion 31 formed as a part of the frame body 25.

Further, a compression coil spring 3 is provided between the valve element 30 and the frame body 25.
2 is attached, and this spring urges the valve element 30 together with the case 28 downward in the figure, in other words, in the valve closing direction of the valve element 30.

A connecting member 33 is attached to the other end of the case 28, and a disc-shaped valve element 34 is attached to the connecting member so as to be movable over a relatively small stroke in the axial direction.

The valve element 34 is biased upwardly in the figure by a compression coil spring 35.

The valve element 34 is connected to the valve housing 2 when the valve element 30 is in the closed position where the valve element 30 is seated on the valve seat 31 and closes the inlet port 18.
The second inlet port 20 is opened at a position remote from the annular valve seat 36 formed in the case 28, and as the case 28 moves upward in the figure, it approaches the valve seat 36. The seat lower back port 20 is then closed.

The valve element 34 has an outer periphery and a valve housing 2 around it.
A relatively small annular gap 37 is defined between the valve chamber 23 and the wall surface of the valve chamber 23 from the inlet port 20.
The flow rate of cooling water is measured by restricting the flow of cooling water.

That is, the flow rate of cooling water flowing through the bypass passage 19 is controlled by the annular gap 37.

The bypass passage 19 allows water pressure at the cooling water outlet port 7 to pass through the bypass passage to the upper chamber 38 in the view of the valve element 34.
The cross-sectional area of the passage is set to be relatively large so that pressure can be transmitted without causing a large pressure loss.

Note that the bypass passage 19 may be configured to measure the flow rate of the cooling water flowing through the bypass passage 19 instead of the annular gap 37.

Further, a guide element 40 surrounding the case 28 is provided on the outer periphery of the case 28.
is installed.

The guide element 40 defines an annular gap 41 between it and the outer circumferential surface of the case 28, that is, the temperature-sensitive surface.
1 is closed at the end on the inlet port 18 side, and is annularly opened at the end on the inlet port 20 side, and receives cooling water flowing in from the inlet port 20.

Further, the guide element 40 has its open end connected to the hole 2 of the frame body 25.
5a with a relatively small gap, and the inlet port 2
Substantially all of the cooling water flowing into the valve chamber 23 from the valve chamber 23 is guided to the annular gap 41.

A hole 42 is provided in the guide element 40 near its closed end.

The opening area of the hole 42 is made larger than that of the annular gap 37 so that it does not become a substantial constriction.

When the temperature of the cooling water is low and is below a predetermined value, the thermally expandable substance 29 of the temperature sensing element 26 exhibits a solid phase, and the valve element 3
0 is pressed against the valve seat portion 31 by the spring force of the compression coil spring 32, thereby closing the inlet port 18.

At this time, the valve element 34 is spaced apart from the valve seat 36 and opens the inlet port 20.

Therefore, when the engine 1 is driven and the coolant pump 8 is driven, the coolant flows from the discharge port 9 of the coolant pump 8 through the coolant passage 10, through the coolant passages 5 and 4, and then flows through the coolant passages 5 and 4. 11, enters the chamber 38 from the inlet port 20 of the temperature-sensitive valve 17 via the bypass passage 19, and further enters the annular gap 37.
substantially all of it enters the annular gap 41 while being guided by the guide element 40 , flows in contact with the temperature-sensitive surface of the case 28 , flows through the hole 42 to the valve chamber 23 , and flows from the outlet port 21 The cooling water reaches the intake port 22 of the cooling water pump 8 and is resupplied to the engine 1 by the pump.

As described above, all of the cooling water flowing into the valve chamber 23 through the bypass passage 19 is guided toward the temperature-sensitive surface of the temperature-sensing element 26, thereby increasing the heat capacity that this cooling water gives to the temperature-sensing element 26. However, the temperature sensing element 26 is greatly influenced by the temperature of the cooling water, and on the contrary, it is not so much influenced by the temperature of the cooling water of the inlet port 18.

As a result, the temperature sensing element 26 is connected to the valve chamber 2 from the bypass passage 19.
It operates in response to the temperature of the cooling water flowing into the cooling water passageway of the engine, that is, the temperature of the cooling water flowing through the cooling water passage of the engine.

When the temperature of the cooling water flowing into the valve chamber 23 from the bypass passage 19 rises and reaches a predetermined value or higher, the thermally expandable substance 29 melts and expands in volume, causing the case 28
moves upward in the figure against the spring force of the compression coil spring 32.

As the case 28 moves, the valve element 30 is pulled away from the valve seat 31 to open the inlet port 18, and the valve element 34 is seated on the valve seat 36 to close the inlet port 20.

At this time, the cooling water that has flowed out of the cooling water pump 8 and flowed through the cooling water passages 5 and 4 flows to the radiator 13 via the cooling water passage 11 and the cooling water conduit 12, and after passing through the radiator 13, the cooling water flows through the cooling water conduit 16. It then reaches the inlet boat 18 of the temperature-sensitive valve 17, from which it enters the valve chamber 23, and the outlet port 2.
1 and is returned to the cooling water pump 8.

Since the guide element 40 rises as the case 28 rises and surrounds the temperature sensing element 26 even in the raised position,
Even if the inlet port 18 is opened and cold cooling water flows into the valve chamber 23, the temperature sensed by the temperature sensing element 26 will not drop immediately due to the cooling water, and the temperature sensing valve will act as an on/off valve. Return bunching does not occur.

Although the present invention has been described in detail with respect to specific embodiments above, the present invention is not limited to the above-mentioned embodiments, and various other embodiments are possible within the scope of the present invention. This will be obvious to those skilled in the art.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing one embodiment of an engine cooling system incorporating a temperature-sensitive valve according to the present invention, and FIG. 2 is an enlarged sectional view showing one embodiment of the temperature-sensitive valve according to the present invention. . 1... Engine, 2... Cylinder head, 3... Tree cylinder block, 4, 5...
・Cooling water passage, 6...Cooling water inlet port, 7.
...Cooling water outlet port, bottom...Cooling water pump, 9...Discharge port, 10°11...Cooling water passage, 12... Cooling water pipe, 13...
...Radiator, 14...Cooling water inlet port,
15... Cooling water outlet port, 16...
Cooling water conduit, 17...Temperature-sensitive valve, 18...
・Inlet port, 19... Bypass passage, 20.
...Inlet port, 21...Outlet port,
22... Suction port, 23... Valve chamber, 24
... Valve housing, 25 ... Frame body, 2
6... Temperature sensing element, 27... Piston rod, 28... Case, 29... Thermal expandable material, 30... Valve Element, 31...
Valve seat portion, 32... Compression coil spring, 33...
...Connecting member, 34...Valve element, 35...
... Compression coil spring, 36 ... Valve seat part, 37
...Annular gap, 38...Chamber, 39...
... Inlet port, 40 ... Guide element, 4
1... Annular void, 42... Hole.

Claims (1)

[Scope of utility model registration request] a first inlet port 18 for receiving cooling water discharged from the engine water jacket through the radiator;
The second inlet port 2 receives the cooling water discharged from the engine water jacket bypassing the radiator.
0 and said first and second inlet ports 20. a valve chamber 23 provided between the two, and an outlet port 21 that opens into the valve chamber.
a first valve element 30 for controlling the opening and closing of the first inlet port; a second valve element 34 for controlling the opening and closing of the second inlet port; the first inlet port to close the first inlet port when the temperature is low and the second inlet port to open the second inlet port when the temperature is high; and a temperature sensitive element 26 driving the second valve element.
and extending around and surrounding the temperature-sensitive surface of the temperature-sensing element, and diverting a flow of cooling water flowing into the valve chamber from the first inlet port from the temperature-sensing surface and from the second inlet port. A temperature-sensitive valve characterized in that it has an annular wall element for guiding a flow of cooling water flowing into the valve chamber toward the temperature-sensitive surface, and a guide element 40 having a hole 42 communicating between the inner and outer spaces partitioned by the annular wall element.