JPH0124343Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a thermostat for stopping the function of a radiator during warm-up operation of an internal combustion engine, and more particularly to an air venting device for the thermostat.

[Prior Art] In general, cooling water that has flowed through the engine's water chamber enters the upper tank of the radiator, is cooled by a heat exchanger, flows to the lower tank, and is then returned to the engine's water chamber by a water pump. It's getting old.

However, when the engine is warmed up, a thermostatic valve stops the circulation of cooling water between the engine and the radiator, and when the temperature of the cooling water exceeds a predetermined value, the upper tank of the engine and radiator A passageway will be opened to connect them.

On the other hand, when replacing or filling cooling water, if the passage connecting the engine and the upper tank of the radiator is not opened, the internal air cannot be removed. A jiggle valve as shown in Publication No. 57-28961 is provided. However, conventional jiggle valves do not have sufficient passage blocking performance, and coolant leaks into the radiator during warm-up, which prevents shortening of warm-up time.

The jiggle valve disclosed in Japanese Utility Model Application Publication No. 49-139431 is constructed so that when the valve body housed in the mesh basket rises due to buoyancy, the air vent hole in the valve plate closes. In this configuration, the size of the valve body is limited by the net cage, and if sufficient buoyancy is not obtained, the valve body may sway under the influence of the water flow or get caught in the middle of the net basket, causing air to bleed. The hole may not close completely.

[Problems to be Solved by the Invention] The purpose of the present invention is to have a simple structure, to have an air vent hole to ensure that air can escape when replacing cooling water, and to ensure that air escapes normally, including during warm-up operation. To provide an air venting device for a thermostat, in which an air venting hole is closed at the same time, thereby making it possible to shorten the warm-up operation.

[Means for Solving the Problem] In order to achieve the above object, the configuration of the present invention includes a valve plate of a thermostat disposed in a passage connecting the water chamber of the engine and the upper tank of the radiator to partition the two. An air vent hole is provided in the valve plate, and a stabilizing leg is provided on the bottom of the float located on the upper side of the valve plate, while a stem of the valve body is provided with a conical surface that is located on the lower side of the valve plate and can be engaged with the air vent hole. It is connected to a float.

[Function] Since the float 30 is disposed above the valve plate 19, the dimensions are not restricted and a sufficiently large buoyancy is applied.
The valve body 32 is brought into close contact with the air vent hole 33. Since the float 31 is disposed above the valve plate 29, it is less affected by the water flow on the water chamber side and is stable.

During water injection, the float 31 is supported on the valve plate 29 by the stabilizing legs 34, so that the state in which the valve body 32 opens the air vent hole 33 is maintained.

[Embodiment of the invention] As shown in FIG. 1, a water pump 6 driven by the engine 10 is arranged, and the suction port of the water pump 6 is connected to one end of a known water chamber provided inside the engine. Ru. The outlet of the water pump 6 is connected via a passage 7 to an inlet 14 of the casing 9. Casing 9
The outlet 13 of is connected to the other end of the water chamber by a passage 12. Further, the outlet 16 of the casing 9 is connected to the passage 8.
The upper tank 2 of the radiator 3 is connected to the upper tank 2 of the radiator 3, and the lower tank 5 is connected to the suction port of the water pump 6 through a passage 15, respectively. The radiator 3 has a heat exchange section 4 connected between an upper tank 2 and a lower tank 5, and cooling water is cooled while flowing from the upper tank 2 to the lower tank 5 via the heat exchange section 4.

The thermostat has a divided body 21a and a divided body 21b.
A housing 21 consisting of an outlet 13 and an outlet 1
The valve plate 29 is attached to the inside of the casing 9 so as to partition the valve plate 29 from the housing 21, and a valve plate 29 is housed inside the housing 21.

The valve plate 29 is arranged so that the inside of the housing 21 can be isolated or communicated with the chamber 24 and the chamber 25, and has a thermally-responsive case formed by filling a flexible case 28 with a thermal expansion body 26 in the center. Bodies are joined. The top end of the rod 35 connected to this thermally responsive body is pressed by a spring 36 against the adjustment bolt 22 screwed into the divided body 21a. Chamber 24 is divided body 2
The chamber 25 connects to the outlet 16 through the through hole provided in the divided body 21b, and the outlet 13 and the inlet 1 through the through hole provided in the divided body 21b.
4, respectively. Such a configuration is almost the same as the conventional one.

According to the present invention, the valve plate 29 is provided with an air vent hole 33 that is opened and closed by a float valve 30. As shown in FIG. 2, the float valve 30 is attached to an air vent hole 33 provided in a valve plate 29. A poppet-shaped valve body 32 is housed in the chamber 25, and the air vent hole 33 is inserted from the valve body 32. A stem 35 that projects into the chamber 24 is passed through a hollow float 31 made of synthetic resin or the like, and the top end thereof is fixed by caulking via a washer 37. Three stabilizing legs 34 that engage with the valve plate 29 are integrally provided on the lower surface of the float 31, and an air vent hole 33 is opened in the illustrated state.

Next, the operation of the device of the present invention will be explained. If cooling water is not filled inside the engine 10,
The thermostat is in the state shown in FIG. 1, and the float valve 30 has an air vent hole 33 as shown in FIG. Therefore, when cooling water is injected from the upper tank 2, it passes through the heat exchange section 4, the lower tank 5, the passage 15, and the suction port of the water pump 6 to the engine 1.
0 water chamber is filled. At this time, air in the water chamber of the engine 10 enters the casing 9 through the passage 12, and is further expelled to the upper tank 2 through the chamber 25, the air vent hole 33, the chamber 24, and the passage 8.

When the engine 10 is filled with cooling water and the water level rises to the upper side of the valve plate 29 of the thermostat, that is, to the chamber 24, buoyancy acts on the float 31, causing the valve body 32 to float up and open the air vent hole, as shown in FIG. 33
is closed.

During warm-up operation, cooling water is sent from the water chamber of the engine 10 to the inside of the casing 9 via the passage 7 by the water pump 6 in FIG. 1, but the chamber 25 is isolated from the chamber 24 by the valve plate 29. Therefore, the cooling water is circulated through the passage 12 to the water chamber of the engine 10, and the warm-up operation is completed within a short time. When the temperature of the cooling water reaches a predetermined value, the thermal expansion body 26 expands, the valve plate 29 is pushed down against the force of the spring 36, and the divided body 21
The engagement with a is released. The chamber 25 and the chamber 24 are communicated with each other, and the cooling water sent from the engine 10 to the casing 9 via the passage 7 by the water pump 6 is transmitted between the chambers 25 and 2.
4, outlet 16, passage 8, flows to upper tank 2,
The water is cooled in the heat exchange section 4, enters the lower tank 5, and is further returned to the engine 10 via the passage 15 by the water pump 6.

[Effects of the invention] As mentioned above, the present invention provides an air vent hole in the valve plate of the thermostat that is installed in the passage connecting the water chamber of the engine and the upper tank of the radiator and partitions the two. Stabilizing legs are provided on the bottom of the float located on the upper side, while the stem of the valve body is connected to the float and has a conical surface that is located on the underside of the valve plate and can be engaged with the air vent hole. Since the dimensions of are not restricted and a sufficiently large buoyancy can be obtained,
The operation is reliable, and since the float is placed above the valve plate, the influence of the water flow on the water chamber side is small and stable. Therefore, as long as the engine is sufficiently filled with cooling water, the float valve will work. Since the air vent hole is reliably closed, a portion of the cooling water does not leak into the radiator during warm-up, and the warm-up time is shortened.

When water is injected, the float is supported by the stabilizing legs on the valve plate, so the air holes are stably maintained in an open state.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing a cooling system of an engine equipped with a thermostat air bleed device according to the present invention;
FIG. 2 is a sectional side view of the device, and FIG. 3 is a side view of the device in a closed state. 3: Radiator, 6: Water pump, 10: Engine,
13, 16: Outlet, 14: Inlet, 21: Housing, 26: Thermal expansion body, 29: Valve plate, 30: Float valve, 32: Valve body, 33: Air vent hole, 34: Stable leg, 35: Stem, 36 : Spring.

Claims (1)

[Scope of utility model registration request] An air vent hole is provided in the valve plate of the thermostat, which is installed in the passageway connecting the engine's water chamber and the upper tank of the radiator to partition the two, and stabilizing legs are provided on the bottom of the float placed above the valve plate. On the other hand, there is an air venting device for a thermostat in which the stem of a valve body, which is disposed on the underside of a valve plate and has a conical surface that can be engaged with an air vent hole, is coupled to a float.