JPS5947186B2 - thermo valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermopulp used, for example, in controlling the temperature of cooling water in a water-cooled internal combustion engine.

In this type of valve, when a heat-sensitive cylinder filled with wax senses a predetermined cooling water temperature and operates to open the valve,
In order to prevent the hunting phenomenon of the valve caused by pressure fluctuations before and after the valve due to the rapid opening of the valve, and to prevent the actual valve opening temperature from increasing, the valve is equipped with a constant temperature rise of the heat-sensitive cylinder. It consists of a sub-valve that opens a small valve opening when the water gets hot, and a main valve that opens a large valve opening when the water temperature rises further and reaches another predetermined temperature. However, since the main valve and the sub-valve are formed separately, the structure becomes complicated and the flow rate cannot be controlled accurately. The present invention has been made in order to improve such disadvantages, and the main valve itself serves as the valve or valve seat of the auxiliary valve, and the case of the heat-sensitive tube itself also operates as the valve or valve seat of the auxiliary valve. In this way, it is an object of the present invention to provide a thermovalve whose structure is simplified and whose flow rate can be controlled accurately.

To explain this with reference to the illustrated embodiment, reference numeral 1 denotes a frame formed in an annular flange, a valve seat 2 having a predetermined length is formed on the inner circumference of the frame 1, and a frame 1 is formed on the outflow side of the valve seat 2. 1 has a heat-sensitive cylinder 3 via a shaft holder 1a.
A main spring 6 is provided on the passenger side of the frame 1 to support a spring receiver 5 which is fixed to the heat-sensitive tube 3 via a spring holder Ib. T is a main valve seated on the valve seat 2, and the main valve T has a sub-valve port 7a seated on a sub-valve seat 3a formed on the case itself of the heat-sensitive tube 3.
The spring receiver 5 is formed into an annular body having an inner periphery thereof.
The valve seat 2 is secured to the valve seat 2 by a sub-spring 8 supported by the valve seat 2. A locking piece 9 is attached to the heat-sensitive tube 3 on the outflow side of the main valve 7, and the locking piece 9 maintains a predetermined distance from the main valve T seated on the valve seat 2 in order to engage with the main valve T. The pore 10 is formed in a disc shape so as to be in contact with the main valve T with an arc without tilting, and furthermore, the small hole 10 is provided to ensure the flow rate from the sub-valve port Ta during the engagement. is formed.

In the figure, 11 indicates a protective film covering the main valve 7. Since the present invention is constructed as described above, when the heat-sensitive cylinder 3 reaches a certain temperature due to the temperature rise of the cooling water on the inflow side from the closed state shown in FIG. It moves downward against the force and opens the sub-valve port 7a, and the cooling water on the inflow side is guided to the outflow side through the valve port 7a, and then the cooling water on the inflow side rises further. When the heat-sensitive cylinder 3 moves downward by more than a certain amount, the locking piece 9 engages with the main valve 7 and opens the valve seat 2 of the main valve 7 against the elastic force of the auxiliary spring 8. Furthermore, since the valve seat 2 has a predetermined length along the moving direction of the main valve 7, a required opening distance is required before the main valve 7 opens. In order to operate the valve, the cooling water temperature must be maintained at or above the set temperature.

This means that if the main valve does not have the required opening distance as in the past, the main valve may open and close repeatedly due to fluctuations in the cooling water temperature around the set valve opening cooling water temperature. This can prevent the problem of fluctuations in the flow rate of the cooling water, which may also be a cause of the hunting phenomenon of the main valve.

In this embodiment, both the main valve 7 and the valve seat 2 have a predetermined length, but even if only one of them has a predetermined length, there is no significant difference in terms of operation and effect. . According to the present invention, the sub-valve seat 3a is formed in the case of the heat-sensitive cylinder 3, and the sub-valve port 7a that seats on the sub-valve seat 3a is formed in the main valve 7. The valve functions as a sub-valve together with the heat-sensitive tube 3, and although the main valve and the sub-valve are formed separately as in the conventional example described above, is the structure simple and simple to avoid complication? However, since the main valve 7 was made to hit the valve seat 2 via the auxiliary spring 8 supported by the spring support 5 of the heat-sensitive cylinder 3, the main valve 7 was hit by the spring with a weak spring force and its Opening/closing control is performed accurately, and the secondary spring is downsized, requiring less installation space.
It has the advantage of being able to be assembled easily and compactly.

[Brief explanation of the drawing]

The drawings show one embodiment of the heather invention, and FIG. 1 is a cutaway sectional view, and FIG. 2 is a plan view. 1...Frame, 2...Valve seat, 3...Thermosensitive cylinder, 3
a... Sub-valve seat, 4... Support shaft, 5... Spring receiver, 6
...Main spring, 7...Main valve, 7a...Sub-valve port, 8.
... Sub-spring, 9... Locking piece, 10... Small hole.

Claims (1)

[Claims] 1. A heat-sensitive tube that is fitted onto a support shaft that passes through the valve seat on the inflow side of a valve seat formed in the frame and is supported by a spring, and a heat-sensitive tube that is supported by the heat-sensitive tube. In the thermovalve including a main valve seated on the valve seat, the main valve is provided with a sub-valve port that seats on a sub-valve seat formed in the heat-sensitive cylinder and closes a fluid flow path leading to the outflow side. The main valve is elastically attached to the valve seat of the main valve via a sub-spring supported by a spring holder of the heat-sensitive tube, and further engaged with the heat-sensitive tube with a predetermined gap between the main valve and the outflow side. A thermovalve characterized by having a locking piece that fits together. 2. The thermovalve according to claim 1, wherein the locking piece is disc-shaped and has a pore provided therein.