JPH1137338A - Thermal valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To omit trouble of preparing a power supply during piping work or providing a bypass separately by providing a thermal reaction element with a valve opening/closing lever which protrudes right and left and can be manually operated and providing slits on a body for enabling movement of the valve opening/closing lever in the opening/closing direction. SOLUTION: When a valve is to be opened manually, a valve opening/closing lever 34 is pushed down against an energizing force of a return spring 29, and a thermal reaction element 27 fixed to the valve opening/closing lever 34 through a snap ring 36 is also pushed down, without carrying electricity to a heat generating body 28, and then, a valve element 24 can be opened through an operating shaft 26, a spacer 37 and the valve element 24. When pushing down of the valve opening/closing lever 34 is stopped, the valve opening/closing lever 34 and the thermal reaction element 27 return to their original position by the energizing force of the return spring 29. At the same time, the valve element 24 is pushed up by a spring 25, seated on a valve seat 33 and brought into the closed state. In a case 22, slits 35 and 35' are formed for vertically moving the valve opening/closing lever 34 provided on the thermal reaction element 27.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a thermal valve. In detail, in order to control the flow of heat medium such as hot water and cold water in the heating and hot water supply system, the operating part of the heat responsive element is slowly expanded and contracted by the temperature change of the heating element, and the gentle opening and closing operation of the valve is performed. The present invention relates to the improvement of a thermal valve.

[0002]

2. Description of the Related Art A conventional thermal valve generally comprises a fluid passage 3 having a fluid inlet 1 and a fluid outlet 2, and a valve seat 4 provided in the fluid passage 3, as shown in FIG. Body 5, a valve body 6 for opening and closing the fluid passage 3, a valve shaft 7 having one end connected to the valve body 6, and an operating shaft 8 contacting the other end of the valve shaft 7. , A heating element 10 such as a positive temperature coefficient thermistor, which is in thermal contact with the heat responsive element 9 and generates heat when energized, the heat responsive element 9 and the heating element 10 And a valve spring 12 for returning the valve body 6 and the like. When the power is supplied, the temperature of the heat-responsive element 9 changes due to the amount of heat of the heating element 10 and the operation thereof is performed. The shaft 8 protrudes to hold the valve body 6 in an open state,
Further, when the power supply is stopped, the operating shaft 8 is pushed back by the spring load of the valve spring 12 abutting on the valve body 6 and is immersed by the cooling of the thermally responsive element 9 to maintain the valve closed state. Has become.

Such a thermal valve can prevent the opening and closing operation sound of the valve element 6 from being generated by the slow operation of the thermal responsive element 9, and can also be used when controlling the on / off of the flow of fluid. Since the phenomenon can be prevented from occurring, it is widely used as a control valve for controlling the flow of a heat medium such as hot and cold water in a hot air heating, a floor heating, a water heater or the like.

[0004]

However, in the above-mentioned conventional thermal valve, the opening and closing of the valve 6 can be controlled only by the amount of heat by energizing the heating element 10. There is a problem that it is necessary to prepare a power supply to open and close the tub, or a separate bypass is required, and the piping work is troublesome.

The present invention has been made in consideration of the above-described conventional problems, and has as its object to realize a thermal valve that does not require a power supply during piping work or a separate bypass.

[0006]

SUMMARY OF THE INVENTION In the thermal valve of the present invention, a body having a fluid passage, a valve seat provided in the middle of the fluid passage, and a fluid provided opposite to the valve seat are provided. A valve body for opening and closing the passage, a thermal responsive element having an operating shaft in contact with the other end of the valve shaft of the valve body, and a thermal valve including a heating element for operating the thermal responsive element, The thermal responsive element is provided with a valve opening / closing lever protruding left and right and capable of being manually operated, and a slit is provided in the main body so as to allow the valve opening / closing lever to move in the valve opening / closing direction.

[0007] In addition, in addition to the above, a step for locking the valve opening / closing lever is provided in a slit in which the valve opening / closing lever moves. In addition, a plurality of steps for locking the valve opening / closing lever are provided.

[0008] By adopting this configuration, a thermal valve which does not require a power source during piping work or a separate bypass is required.

[0009]

FIG. 1 is a view showing a first embodiment of the present invention. FIG. 1 (a) is a front view, and FIG. 1 (b) is a view of FIG.
It is sectional drawing in the -b line. In the present embodiment, a main body 20 including a body 21 and a case 22 as shown in FIG.
, A valve body 24 having a valve shaft 23, a valve spring 25 for urging the valve body in the closing direction,
6, a thermally responsive element 27 such as a wax thermoelement displaced up and down, and comes into thermal contact with the thermally responsive element 27;
Heating element 28 such as a positive temperature coefficient thermistor that generates heat when energized
And a return spring 29 for pressing the heat responsive element 27 against the heating element 28.

The body 21 is provided with a fluid passage 32 having a fluid inlet 30 and a fluid outlet 31 at both ends, and a valve seat 33 formed in the middle of the fluid passage 32.
The valve body 24 is pressed against the valve seat 33 by the valve spring 25 and is seated thereon. The case 22 has a space for accommodating the thermal response element 27 and slits 35 and 3 in which a valve opening / closing lever 34 provided in the thermal response element 27 described later can move up and down.
5 'is formed.

A left / right protruding valve opening / closing lever 34 is fixed to the thermoresponsive element 27 by a retaining ring 36. The thermoresponsive element 27 is housed in the case 22 and its operating shaft 26 is connected to the valve via a spacer 37. It is in contact with the upper end of the shaft 23. A heating element 28 is attached to the upper part of the case 22 by a heater cover 38, and the heat-responsive element 27 is pressed by the return spring 29 against the heating element 28, and the heat-sensitive portion 27 a is in contact with the heating element 28. . In addition, 3
9 is a cover for closing the lower opening of the body 21, 40 is an O-ring for sealing between the body 21 and the valve shaft 23, and 41 is a terminal of the heating element 28.

The wax thermoelement used for the thermoresponsive element 27 has a wax sealed therein, and the volume expansion and contraction of the wax due to the temperature change can be changed to the protrusion and retraction of the operating shaft 26 via the diaphragm. Convert. Further, the positive temperature coefficient thermistor used for the heating element 28 is generally called a PTC heater, and has a characteristic that when the temperature of the oxide semiconductor is higher than the Curie point, the electric resistance rapidly increases. It has a control function and is widely used as a constant temperature heating element.

In the first embodiment constructed as described above, when the heating element 28 is not energized, the valve body 24 is pushed upward by the spring pressure of the valve spring 25 as shown in FIG. The fluid passage 32 is closed in a closed state. At the same time, the operating shaft 26 of the thermoresponsive element 27 is also pushed upward through the valve shaft 23 and is immersed.

FIG. 2 shows the case where the heating element 28 is energized.
The heating element 28 generates heat, and the amount of heat is heated by the return spring 29 to heat the heat-sensitive portion 27a on the upper part of the heat-sensitive element 27 which is in close contact with the heat-sensitive element 27 to expand the volume of the wax inside and gradually operate the operating shaft 26. Let it protrude. The protruding operating shaft 26 pushes down the valve shaft 23 via the spacer 37 to open the valve body 24. Since the positive temperature coefficient thermistor of the heating element 28 keeps the heating temperature constant by its self-temperature control function, the wax thermoelement of the heat responsive element 27 always maintains a constant displacement amount and keeps the valve opening degree constant during energization. To hold.

When the power supply to the heating element 29 is stopped, the volume of the wax thermoelement of the thermoresponsive element 27 is reduced by cooling. Therefore, the operating shaft 26 is pressed by the valve spring 25 via the valve shaft 23 and the spacer 37, and is gently immersed. At the same time, the valve body 24 also performs the valve closing operation.

When the valve is manually opened, the valve opening / closing lever 34 is pushed down against the urging force of the return spring 29 without energizing the heating element 28 as shown in FIG. Since the heat responsive element 27 fixed to the valve opening / closing lever 34 via the retaining ring 36 is also pushed down, the valve body 24 can be opened via the operating shaft 26, the spacer 37, and the valve shaft 23. When the depression of the valve opening / closing lever 34 is stopped, the valve opening / closing lever 34 and the thermoresponsive element 27 return to the original positions by the urging force of the return spring 29, and at the same time, the valve body 24 is pushed up by the valve spring 25 and seated on the valve seat 33. And the valve is closed.

FIG. 4 is a view showing a second embodiment of the present invention. This embodiment is almost the same as the previous embodiment, except for the slit 3 provided in the case 22.
5, 35 '. That is, in the previous embodiment, the slits 35 and 35 ′ are simply rectangles that are long in the vertical direction, but in the present embodiment, the horizontal step 42 is provided in the middle in the vertical direction in the circumferential direction.

In this embodiment constructed as described above, the valve opening / closing lever 34 can be locked to the step portion 42 by pushing down and rotating the valve opening / closing lever 34. As a result, the open state of the valve body 24 can be maintained.

FIG. 5 is a view showing a third embodiment of the present invention. This embodiment is almost the same as the previous embodiment, except that a plurality of steps are provided in the slits 35 and 35 '. In the present embodiment configured as described above, the valve opening can be set according to the plurality of steps 42, and the fluid flow can be manually adjusted without energizing the heating element 28. it can.

[0020]

According to the present invention, a valve for opening and closing a valve is provided on a thermally responsive element so that a valve can be opened and closed manually, so that a power source can be prepared at the time of piping work or a separate bypass can be provided. It is possible to easily perform the piping work without the need for a pipe.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention, in which (a)
Is a front view, and (b) is a cross-sectional view taken along line bb in (a).

FIG. 2 is a diagram illustrating a state in which a heating element according to the first embodiment of the present invention is energized to open a valve.

FIG. 3 is a diagram illustrating a state in which the heating element according to the first embodiment of the present invention is not operated and the valve opening / closing lever is manually operated to open the valve.

FIG. 4 is a front view showing a second embodiment of the present invention.

FIG. 5 is a front view showing a third embodiment of the present invention.

FIG. 6 is a longitudinal sectional view showing a conventional thermal valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 ... Body 21 ... Body 22 ... Case 23 ... Valve shaft 24 ... Valve body 25 ... Valve spring 26 ... Actuating shaft 27 ... Thermal response element 28 ... Heating element 29 ... Return spring 30 ... Fluid inlet 31 ... Fluid outlet 32 ... Fluid passage 33 ... Valve seat 34 ... Valve opening / closing lever 35, 35 '... Slit 36 ... Retaining ring 37 ... Spacer 38 ... Heater cover 39 ... Cover 40 ... O-ring 41 ... Terminal 42 ... Step

Claims (3)

[Claims] A fluid passage (32) and said fluid passage (3).
A body (20) having a valve seat (33) provided in the middle of 2), a valve body (24) provided opposite to the valve seat (33) to open and close a fluid passage, and a valve body (24). ) Valve shaft (23)
A thermally actuated element (27) having an operating shaft (26) in contact with the other end of the heat-operating element, and a heating element (28) for operating the thermally-responsive element (27). The response element (27) is provided with a valve opening / closing lever (34) that projects to the left and right and can be manually operated, and the main body (20) has a slit (34) that allows the valve opening / closing lever (34) to move in the valve opening / closing direction. 35, 35 '). 2. A step (42) for locking the valve opening / closing lever (34) in a slit (35, 35 ') in which the valve opening / closing lever (34) moves. 1. The thermal valve according to 1. 3. The thermal valve according to claim 2, wherein a plurality of steps (42) for locking the valve opening / closing lever (34) are provided.