JPS6314158Y2 - - Google Patents

Description

[Detailed Description of the Invention] In a thermostatic trap whose valve closing temperature can be adjusted, erosion and scaling of the valve body by high-temperature condensate are a major cause of malfunction. Therefore, the applicant of the present application
In Japanese Patent No. 56-49487 and Japanese Patent Application No. 54-123449), we proposed a technique to solve this problem by using a rolling effect produced by using a hard gold transition ball as a valve body.

However, although the above-mentioned rolling effect appears greatly when the valve stem driven by the bimetal and the ball valve are in point contact, it is not greatly hindered by the expansion of the contact area due to a dent on the lower end surface of the valve stem or by scratches. , confirmed by subsequent experiments.

In view of the above points, the present invention organically combines a configuration in which a hard metal ball valve is provided and a configuration in which a hard metal ball valve contact body is fixedly attached to the end of the valve stem. By doing so, we propose a trap that can always exhibit a perfect rolling effect.

Embodiments of the present invention will be described below with reference to the drawings. First, to explain the embodiments shown in FIGS. 1, 2, and 3, A is a casing, which includes a barrel 1, an outlet lid 2 with an outlet 4 screwed onto the upper end thereof, and a lid 2 with an outlet 4 screwed onto the lower end of the barrel 1. It consists of an inlet cover 3 with an inlet 5.
6 is a valve seat screwed into the upper center part of the inlet cover 3;
A truncated conical valve seat surface 6a is formed in the center,
A valve hole 7 is bored through which the center of the valve seat surface communicates with the inlet 5. 8 is a guide body integrally formed on the upper part of the valve seat 6, and a guide hole 9 is bored in the center of the guide body.
Further, a plurality of horizontal holes 10 radially extending to the guide hole 9 are drilled in the intermediate portion thereof in an evenly distributed manner. 1
Reference numeral 1 denotes a bolt mounting wall formed at the center of the outlet cover 2, and a plurality of orifices 12 are bored in the outer circumference of this wall. An adjustment bolt 13 is screwed into the center of the mounting wall 11, and an engagement groove 14 for an adjustment tool is provided at its upper end, and a recessed hole 15 is provided at its lower end. In this way, within the heat-sensitive chamber C surrounded by the barrel cylinder 1, the valve seat 6, the mounting wall 11, etc., the lower end can be freely slid into the guide hole 9, and the upper end can be slid freely into the recessed hole 15 of the adjustment bolt 13. At the center of the guided valve stem 16 is a bimetal laminate B consisting of a pair of bimetal layers with their low expansion sides facing inward.
is fitted onto the outside in a skewered manner, the upper end surface of the laminate B is in contact with the lower end 13a of the adjustment bolt 13, and the lower end surface of the laminate B is in contact with the E-ring 1 engaged with the valve stem 16.
7. Therefore, if the adjustment bolt 13 is screwed to increase the amount of downward protrusion, the lower end 13
Since the distance between a and the E-ring 17 is reduced, even if the bimetal laminate B is slightly bent, the force will be transmitted to the valve stem 16. That is, the valve rod 16 is configured to be forced downward as the bolt 13 is protruded downward at a lower temperature. 16b
is a contacting body made of a steel ball or a metal with a hardness close to that; in this example, it is made of a steel ball, and is fixed by being fitted into the lower end recess 16c of the valve stem body 16a and then caulked. Further, 18 is a ball valve made of a steel ball, which is interposed between the valve seat surface 6a and the contact body 16b, and makes point contact with the lower end surface of the contact body 16b. Reference numeral 19 denotes a locking ring for the bolt 13.

Next, to explain the action of the trap, when heated fluid with a temperature lower than the set temperature reaches the inlet 5 side, the bimetal laminate B will restore its flat shape as shown in Fig. 2 because the temperature in the heat sensitive chamber C is low. Then, the valve stem 16 is moved upward by the pressure acting on the ball valve element 18 from the valve hole 7, the ball valve element 18 is unseated, and the low temperature fluid flows into the radial horizontal hole 10.
Then, it passes through the orifice 12 of the mounting wall 11 and is discharged from the outlet 4 while making uniform contact with the circumferential surface of the bimetal laminate B.
As shown in FIG. 1, when the heated fluid at a temperature higher than the set temperature reaches the inlet 5 side, the bimetal laminate B bends and pushes the valve stem 16 downward via the E-ring 17, so that the ball valve 18 It is forcibly seated and the valve hole 7 is closed. In this way, the ball valve 18 is opened and closed, and the temperature of the fluid on the inlet 5 side is kept constant.

In the above, when the valve stem 16 pushes the ball valve element 18 downward to close the valve, the ball valve element 18 and the valve stem 16
If there is an extreme difference in hardness between the abutting body 16b of the valve stem 16b, it would be fine if a dent is formed by chance at the best position, but normally this does not occur, and the dent occurs at an eccentric position, and the valve closing force is reduced to the valve stem 1.
6, which causes valve closing failure. However, in the present invention, the abutting body 16b of the valve stem 16 and the ball valve 18 are set to have the same hardness or close to it, so that there is no dent or scratch on both, and the valve closing force is always on the axis of the valve stem 18. It never deviates from the position.

Next, to explain how to set the temperature of the trap, first, at room temperature, when the bimetal laminate B has completely restored its flat shape, screw the adjustment bolt 13 all the way in to find the zero point, and then unscrew the bolt 13 from there. However, the discharge temperature at each pressure of the heating fluid, that is, the unseating temperature of the ball valve 18 is determined by the number of rotations of the screw back. However, at this time, when the bolt 13 is screwed in, the ball valve 18 is pressed against the valve seat surface 6a through the abutting body 16b of the valve stem 16, so if there is a large difference in hardness between the abutting body and the ball valve, the softness may occur. However, in the present invention, there is almost no difference in hardness between the two, so no dents or the like occur.

In addition, although the example in which the abutting body 16b fixed to the lower end of the valve stem body 16a is spherical has been described above, the present invention also allows the abutting body 6b to be cylindrical as shown in FIG. It is also possible to fix it to the lower end of the valve stem body 16a in the form of a cap as shown in FIG.

As is clear from the above explanation, in the present invention, a valve seat with a valve hole is provided so as to be located between the inlet and the outlet of the casing, and a plurality of valve seats are formed on the cylindrical guide formed on the outlet side of the valve seat. Horizontal holes are equally distributed to form a heat-sensitive chamber on the outlet side of the guide body through which all the waste water reaching the outlet flows, and a bimetal and its temperature-sensitive bending are formed at the center of the heat-sensitive chamber. A valve stem that moves linearly is arranged, and the outlet of the heat-sensitive chamber is communicated with the outlet through a plurality of orifices located on the outer periphery of the heat-sensitive chamber, so that even a small amount of waste water reaching the outlet is concentrated in the center of the bimetal. This ensures that there is no delay in the operation of the bimetal, ensuring accurate drainage temperature, and that a hard metal ball is placed between the valve stem and the valve seat, which move in a straight line due to the bending of the bimetal. Since the valve is inserted, even if the center of the valve stem and the center of the ball valve are slightly misaligned, the ball valve can be completely seated and unseated, making assembly easy. Because it is lighter than the valve, when the valve is open, even a small amount of wastewater rolls freely due to the flow, making it difficult for scale to adhere to the ball valve, and the ball valve rolling while contacting the valve seat surface. Because of this, scale on the valve seat surface can be automatically removed, and uneven wear on the ball valve and valve seat is also eliminated. In addition, in this invention,
The contact part of the valve stem to the ball valve is formed by a hard metal contact body that is separate from the valve stem body, and the hardness of the valve stem contact body and the ball valve are set to be the same or close to it. , and because the rolling range of the ball valve is limited by the guide body, there will be no dents or scratches on both, and the valve closing force will not always deviate from the axis of the valve stem. The rolling effect of the ball valve is not hindered by dents or scratches on the valve stem, and there are almost no problems in terms of processing or cost unlike when the entire valve stem is made hard.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the embodiment of the present invention in the valve closed state;
3 is a partially cutaway side view of the valve stem, and FIGS. 4 and 5 are partially cutaway side views of different modifications of the valve stem. A: Housing, 4: Outlet, 5: Inlet, 6: Valve seat, 6
a: valve seat surface, 7: valve hole, B: bimetal laminate,
C: heat sensitive chamber, 8: guide body, 10: side hole, 12: orifice, 16: valve stem, 16a: valve stem body, 16
b: Contact body, 18: Ball valve, 13: Adjustment bolt.

Claims (1)

[Scope of utility model registration request] A valve seat with a valve hole is provided so as to be located between the inlet and outlet of the housing, and a plurality of horizontal holes are evenly distributed in a cylindrical guide body formed on the outlet side of the valve seat. A heat-sensitive chamber is formed on the outlet side of the body through which all the waste water reaching the outlet flows, and a bimetal and a valve stem that moves in a straight line due to the thermo-sensitive bending of the bimetal are disposed in the center of the interior of the heat-sensitive chamber. One end of the rod is formed of a hard metal abutting body that is separate from the valve stem main body and is fixed to the main body, and is fitted into the guide body, with a valve hole formed between the corresponding abutting body and the valve seat. A hard metal ball valve for opening and closing is interposed, the hard metal contact body is set to have the same hardness as or close to the hard metal ball valve, and the outlet portion of the heat sensitive chamber is located on the outer periphery of the hard metal contact body. A thermostatic trap, characterized in that the trap communicates with the outlet through a plurality of orifices located therein.