JPH0738854U - Thermo valve - Google Patents

Abstract

(57) [Abstract] [Purpose] When sliding a cylindrical valve element in a cylindrical valve casing, the force point of the thermoelement that presses the valve element and the force point of the spring that opposes this The axial distance is set so as not to exceed 1/2 of the diameter of the valve body to prevent the valve from sticking. [Structure] A cylindrical valve element 11 is slid in a valve case 2 of a thermovalve 10 to open and close the first and second outflow windows 4 and 5. When the valve body 11 is pressed by the tip 7a of the thermo-valve 7, the force of the coil spring 12 acts on the stepped portion 11b, but the axial distance M at the point where these forces act is 1 of the diameter dimension D of the valve body 11. Since it does not exceed / 2, the moment that acts due to eccentricity is small and sticking does not occur.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a thermovalve that switches the flow path of a fluid according to its temperature.

[0002]

[Prior art]

 There is a conventional fluid flow path, for example, a thermo valve is installed in the cooling water pipe of an automobile engine, and the flow path between the heat radiating side and the non-heat radiating side is switched by the thermo-sensing action of the thermo valve. An example thereof is shown in FIG. The thermo valve 1 is provided with a slidable cylindrical valve body 3 in a cylindrical valve case 2 and has first and second outflow windows 4 and 5 provided on the side wall of the valve case 2 at a distance in the axial direction. The movement of the body 3 in the axial direction is switched so that one is closed and the other is opened.

In order to operate the valve body 3, the valve body 3 is pressed through the arm 3a by the tip 7a of the thermovalve 7 arranged on the open end side forming the inflow port 6 of the valve case 2, A coil spring 9 is arranged at the closed end 8 on the opposite side, and one end of the coil spring 9 is seated on the step portion 3b provided on the inner wall of the valve body 3 to press the valve body 3. The thermo valve 7 pushes the rod 7c from the chamber 7b containing the wax as a temperature sensitive material by the expansion of the wax and pushes the valve body 3 with the tip 7a of the rod 7c to contract the coil spring 9 and the first outlet port 4 to the outside. The second outflow window 5 that is opened is closed, and the high-temperature fluid that has flowed in from the inflow port 6 flows out to the first outflow port 4.

When the temperature of the fluid flowing in from the inlet 6 becomes low, the wax in the chamber 7b contracts and the pressing force of the rod 7c disappears, so that the valve body 3 is pushed back by the coil spring 9 and the first outlet window 4 is pushed. Close the second outflow window 5 open. The low temperature fluid thus flows out through the second outflow window 5.

[0005]

[Problems to be solved by the device]

 In the above-mentioned conventional thermovalve 1, since the stepped portion 3b for seating the coil spring 9 on the valve body 3 is provided at a position relatively close to the closed end 8, when the pressing force of the thermoelement 7 acts on the tip 7a, The distance L between the stepped portion 3b, which is the point of reaction force against it, and the tip 7b of the pressing force was relatively large with respect to the diameter dimension D of the valve body 3. Therefore, when the valve body 3 slides in the valve case 2, a strong lateral pressure acts on the inner wall of the valve case 2 due to the moment acting at the distance L even if there is a slight eccentric inclination, and the valve body 3 slides. Is stuck, and the valve body cannot be moved smoothly. Therefore, the switching operation of the high temperature and low temperature flow paths of the fluid becomes inaccurate and the normal operation cannot be performed. This is the same when shifting from low temperature to high temperature and vice versa.

[0006]

[Means for Solving the Problems]

 In this invention, the axial distance between the position where the spring is seated on the valve element and the tip of the thermoelement in the thermovalve as exemplified above does not exceed 1/2 of the diameter of the valve element. It is a thing.

[0007]

[Action]

 In a thermovalve of this configuration, the axial distance between the point where the valve body receives the pressing force of the thermoelement and the seating position of the spring that receives the reaction force is short, and the length is from the tip of the thermoelement to the inner wall of the valve case. Since the distance is less than the distance to the valve (radial length of the valve body), even if the pressing force is eccentric, the component force in the nuclear direction that presses against the inner wall of the valve case as a moment becomes small and sticking to the sliding of the valve body occurs. Does not happen.

[0008]

【Example】

 FIG. 1 shows a thermo valve 10 of the embodiment. FIG. 1 shows a state in which the first outflow window 4 on the high temperature side is opened, and the valve case 2, the first outflow window 4, the second outflow window 5, the inflow port 6, the thermo valve 7, and the tip 7a thereof are It is similar to that of the conventional FIG.

The cylindrical valve element 11 is slidably provided in the valve case 2 and opens and closes the first and second outflow windows 4 and 5 by axial movement thereof. The arm 11 a of the valve body 11 has the same shape as the arm 3 a of FIG. 2 and contacts the tip 7 a of the thermoelement 7. Further, a step portion 11b is provided on the inner wall of the valve body 11 and is seated on the step portion 11b to provide the coil spring 12 between the closed end 8 of the valve case 2. The axial distance M between the stepped portion 11b at which the coil spring 12 is seated and the tip 7a of the thermoelement 7 is a length that does not exceed 1/2 of the diameter D of the valve body. When the temperature of the fluid decreases, the tip 7a of the thermo valve 7 retreats, and the pressing force of the coil spring 12 causes the valve body 11 to move to this position by using the step 2a on the open end side of the valve case 2 as a stopper and to the second position. Open the outflow window 5.

In addition to this embodiment, for example, the temperature-sensitive material of the thermovalve may be bimetal instead of wax, or the closed end side spring may be a leaf spring other than the coil spring. . The flowing fluid can be water, air, oil or other fluids.

[0011]

[Effect of device]

 In this invention, the axial distance between the force points of the pressing force and the reaction force when the cylindrical valve element slides is made short, and it is assumed that it does not exceed 1/2 of the diameter of the cylindrical valve element. The eccentric moment that prevents the valve body from sliding is reduced, the valve slides smoothly without sticking, and the fluid flow path switching action is accurate and reliable.

[Brief description of drawings]

FIG. 1 is a sectional view of an example.

FIG. 2 is a sectional view of a conventional thermovalve.

[Explanation of symbols]

 2 Valve case 4, 5 Outflow window 6 Inlet 7 Thermoelement 11 Valve body 12 Spring

Claims (1)

[Scope of utility model registration request] 1. A first and a second outlet window axially spaced apart are provided on a side wall of a cylindrical valve case having an open end as an inflow port and the other end as a closed end, and slide inside the valve case. A cylindrical valve element is provided so that one of the first and second outflow windows is opened and the other is closed by axial movement of the valve element, and at the tip of the thermoelement which is arranged on the open end side and extends at high temperature. In a thermovalve that presses the valve element toward the closed end, and a spring provided on the closed end side presses the valve element toward the open end, the axial distance between the position where the spring is seated on the valve element and the tip of the thermoelement is A thermovalve characterized in that the diameter of the valve body is not exceeded 1/2.