JPS5919782A - Air vent valve - Google Patents

Abstract

PURPOSE:To reduce troubles, by making valve body depressing operation unnecessary in pouring water by constructing a float valve floated on the surface of cooling water to serve as an air vent valve, and eliminating restriction in a cooling water passage by omitting a return spring. CONSTITUTION:Since there is no cooling water in a valve at the time of starting water pouring operation and a valve element 24 of a float valve is lowered to the position where it is held in contact with a flange portion 20A, air carried from a port 21 is passed through air vent holes 24A and the inside of a sleeve and then discharged to the outside from a hole 23A formed in a cover 23. When cooling water comes to the position of the air vent holes 24A formed in the valve element 24, the valve element 24 is raised upward until it comes into contact with the cover 23 and the inner space of the valve is filled with cooling water, so that the valve element 24 is pressed against the cover 23 in a watertight manner by means of an O-ring 25. Here, since the watertightness is increased with increasing of the pressure of cooling water, a positive seal can be obtained against pressure change of cooling water.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air bleed valve suitable for bleeding air from a heater core of a heating system for a low-temperature automobile in which the total heat source of the cooling water of a water-cooled engine is shut off.

This type of heating device has a system configuration shown in FIG.

The cooling water in the water jacket of the water-cooled engine 1 is circulated by the engine-driven water pump 2, and when the water temperature is higher than the operating temperature of the thermostat 3, it is sent to the radiator 4 to be cooled, and then returned to the water jacket, where it is Adjusted to a constant temperature. In addition, the engine cooling water is circulated through the hot water valve 5 in the required amount to the heater core 6 side, and in the heater core 6 it exchanges heat with heating air.
It serves as a heating heat source by blowing heated air into the vehicle interior.

In such a hot water heating system, it is necessary to bleed air when injecting cooling water from the water inlet of the radiator 4 to the water jacket and heater core, and for this air bleed, the heater core 6 has an air bleed valve located high in the cooling water circulation path. 7
A valve 7 is provided to open the valve 7 to release air when cooling water is injected.

As the conventional air bleed valve 7, a three-way valve shown in FIG. 2 is used. In the valve body 8, a cooling water passage is formed in a boat 8A that communicates with the heater core 6 and a boat 8B that communicates with the water pump 2, and a spool 9 is disposed in a sleeve 8C that is held above and perpendicular to the cooling water passage. provided. The spool 9 is connected to the sleeve 8 by the return spring 10.
It is lifted in the direction C and is closed from the air vent hole 8De provided in the sleeve 8C from the cooling water passage. Spool 9
A sealing O-ring 11 is provided between the sleeve 8C and the sleeve 8C. The top of the sleeve 80 is provided with an operating rod through hole for pushing and operating the spool 9. The second device is shown closed from the cooling water passage of the air bleed boat 8Di, and to inject water into the heater core 6, push the spool 9 with the operation rod 12 as shown in FIG.
8Dt: Vent air (indicated by arrow) by communicating with the cooling water passage.

Such a conventional three-way valve requires a jig and effort for pressing down the spool 9 when water is poured by the user or at a maintenance shop. In addition, the valve structure requires a push-back spring 10, and the spring 10 is located in the cooling water passage, increasing passage resistance.
There was also a fear that it would overflow.

The object of the present invention is to provide an air release device which eliminates the problems of the conventional method by using a float type spool.

FIG. 3 is a partially cutaway perspective view showing an embodiment of the present invention.

A flange portion 2OA is provided at or at a higher position on the cylindrical valve body 20 with the axial direction being the vertical direction. The upper end surface of the valve body 20 has a small hole 23A in the center as an air release boat.
'(i=closed by the lid 23 held by the valve body 20, a sleeve is formed between the lid 23 of the valve body 20 and the flange portion 2OA, and a cylindrical float valve body 24 is fitted into the sleeve so as to be slidable in the axial direction. The float valve body 24 is provided with a plurality of air relief holes 24A in the circumferential direction that penetrate in the sliding direction inside the seven flange portions 20A. A groove 24B is provided in which the sealing O-ring 25 is fitted.The sealing O-ring 25 is provided in the air release hole 24A.
The diameter is set to be inside the hole 23A of the lid 23 and outside the hole 23A of the lid 23. Further, the float valve body 24 is provided with a cavity portion (see FIG. 4) 240 apart from the air relief hole 24Ai, and is configured to float on the cooling water.

Although the valve body and the float valve body are described as having a cylindrical shape, the present invention is not limited to this, and it goes without saying that the valve body and the float valve body may have a rectangular shape.

In this configuration, when water injection starts, there is no cooling water in the valve, and air in the heater core is pumped in from the inlet boat 21. In this state, as shown in the fourth position, the float valve body 24 has been lowered to a position where it faces the flange portion 20A, and the air sent from the boat 21 is pumped into the sleeve from the air relief hole 24A as shown by the arrow. through the hole 23A of the lid 23.

This air bleeding is continued until the heater core 6 is filled with cooling water and the cooling water passage leading to the artificial boat 21 and the water pump 2 is filled with cooling water. Then, when the cooling water enters the air relief hole 24AK of the valve body 24, the valve body 24 begins to rise with buoyancy relative to the cooling water, and the air in the sleeve is also removed, until the valve body 24 is lifted in position 1 where it faces the lid 23. This state is the fourth
As shown in Figure [Bl], the inside of the valve is filled with cooling water,
The valve body 24 and the lid 23 are pressed in a watertight state by an O-ring. In this sealed state, the degree of water tightness increases according to the cooling water pressure due to the rotation speed of the water pump 2,
A reliable seal is ensured even when the pressure of the cooling water changes.

Therefore, according to the present invention, since the float valve that floats on the cooling water is used as the air release side valve, there is no need to push down the valve body during water injection work as in the past, and there is no need to use a push-back spring to cool the air. Without obstructing the entire water passage, it is possible to reliably bleed air even when water is poured by the user, and to reduce the causes of failure.

[Brief explanation of the drawing]

Fig. 1 is a system configuration diagram of a hot water type automobile heating system, Fig. 2 is a sectional view of a conventional three-way air vent valve, Fig. 3 is a partially cutaway perspective view showing an embodiment of the present invention, and Fig. 4 is a sectional view for explaining the operation of FIG. 3; 6... Heater core, 7... Air bleed valve, 20...
Valve body, 21... Inlet boat, 22... Outlet port, 23... Lid, 23A... Small hole for air release boat,
24... Valve body, 24A... Air relief hole, 24B...
・Groove, 25...0 ring. Figure 1

Claims (1)

[Claims] The axial inner metal has a vertical valve body, a water inlet boat and an outlet port that communicate with the lower circumferential surface of the valve body, and an inner circumferential surface of the valve body that extends in the axial direction above the position of both boats. A valve body that is slidably fitted and has an air release through hole in the axial direction and a cavity for floating on water, and the upper end surface of the valve body is closed and floated with an air release hole. An air vent valve characterized in that the above-mentioned valve body is equipped with a lid that becomes watertight.