JPS5899574A - Water-escape cock to prevent freezing - Google Patents

Abstract

PURPOSE:To prevent the freezing of city water automatically by providing a valve to intercept a water-introduction port by a thermostat inserted in a water- flow line conducted to a tap, an air suction valve to introduce air into the water-flow line in accordance with the movement of the valve, and a restoring- operation handle manually operated. CONSTITUTION:A water-flow pipe 1 is connected to a tap in its connecting port 2 and to an underground water pipe in its introduction port 3, and provided with a water-flow passage 4 inside. A heat-sensing part 6 of a thermostat 5 is inserted into the water-flow passage 4. When the water temperature in the water- flow passage 4 is lowered near the freezing temperature, the volume of wax 7 is reduced, and a fitting rod 17 is pulled upward via a rod 12. Consequently, a control rod 18 caught thereby is shifted to the right by the force of a spring 23, and the introduction port 3 is closed by an interception valve 21. As the control rod 18 is shifted to the right, an air-passing bar 26 is brought down on a cam face 28, and a suction port 31 is opened by an air-suction valve 30. Meanwhile, a drain hole 35 is opened, and the water in the water-flow passage 4 is discharged to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water drain valve for preventing tap water from freezing, which drains and empties water in the flow channel of a water pipe protruding above the ground in order to prevent tap water from freezing. Drain valves that attempt to prevent freezing accidents have been widely known for a long time.

However, conventionally known water drain valves are manually operated, and therefore have the drawback that they may be forgotten to drain water, or may become colder than expected, resulting in freezing accidents.

The present invention eliminates the above-mentioned drawbacks, uses a thermostat to sense the freezing temperature of tap water, automatically drains and drains the water, and when using tap water, manually operates the water to flow through the water channel. It is. An example of this will be explained below with reference to the drawings. 1 is a water pipe with an upper communication port 2 at one end connected to a faucet and an inlet 3 at the lower end connected to an underground water pipe; A temperature sensing portion 6 of a thermostat 5 is inserted into the flow path 4. This temperature-sensing section 6 is optically filled with wax 7, which decreases in volume as the temperature drops and increases in volume as the temperature rises, and one end of the temperature-sensing section shaft 9 is inserted through a sleeve 8 made of a soft elastic material. . This temperature sensing portion shaft 9 has a temperature sensing portion spring 1.
1, the wax 7 is always urged inward by the temperature sensing part 6, and when the tap water approaches freezing temperature and the volume of the wax 7 decreases, the wax 7 is inserted into the temperature sensing part 6 by the amount of volume reduced and moves its position. Along with this movement, the shaft 12 connected and fixed to the lower end is pulled upward in the drawing. A connecting hinge 13 fixedly connected to the lower end of the shaft 12, a storage box 14 fixed to the connecting pin 13, one end of which is slidably inserted into the storage box 14 without being pressed by the spring 15, and the other end is inserted into the storage box 14. As the shaft 12 is raised by σ1, the protruding end 16 projects downward from the storage box 14 and is slidably inserted into the connecting bottle 13, and the fitting rod 17 is positioned inward from the tip of the connecting bottle 13. and pull it upward in the drawing. The fitting rod 17 is fitted and inserted into the fitting hole 19 of the control shaft 18 when tap water is flowing in the flow channel 4, ff1l, that is, when the tap water is not frozen. A split groove 20 into which only the connecting bottle 13 can be inserted is provided on both sides of the fitting hole 19 in the axial direction. The control shaft 18 is provided with a cutoff valve 21 at the other end.
is located facing the inflow side of the tap water inlet 3, and allows free flow of tap water from the water pipe connected to the connection port 22 at all times. In this state, if the faucet is opened, tap water will flow through the flow channel 4, and if the faucet is closed, the flow of tap water will be stopped. In this stopped state, the outside temperature approaches the freezing point, and when the tap water in the flow channel 4 drops to just before the freezing temperature, the temperature sensing section 6 of the thermostat 5 senses this. Temperature sensing part 6
As the wax 7 inside decreases in volume due to a decrease in temperature, the temperature-sensing shaft 9 is inserted into the temperature-sensing part 6 by the pressing force of the temperature-sensing part spring 11 by the amount of the volume reduction, and the shaft 9 and the fitting rod 17 are inserted into the temperature-sensing part 6. The control shaft 18 is pulled up from the fitting hole 19 in the drawing to release the fitting relationship between the fitting rod 17 and the control shaft 18. As a result of this release, the control shaft 18, which was always pressed by the control spring 23 in the direction in which the shutoff valve 21 closes the inlet 3, is pushed and slid by the pressing force of the control spring 23, and the shutoff valve 21 closes the inlet 3. and stop the flow of tap water into the waterway. As the control shaft 18 slides, the lower end is pressed onto the upper surface cam 24 protruding from the upper surface of the control shaft 18, and the cam 24 is slidably inserted into the insertion tube 25 provided in the vertical direction of the flow channel 4. The ventilation shaft 26 descends while sliding on the tapered blood 28 of the upper cam 24 due to its own weight and the pressing force of the descending spring 27, and its lower end abuts the upper surface of the control shaft 18. As the ventilation shaft 26 descends, the air intake valve 30 provided at the upper end of the ventilation shaft 26 opens the air intake hole 31 at the upper end of the insertion tube 25, and the air enters the flow channel 4 through the air introduction path 32. The air flows into the flow channel 4 from the air outlet hole 33 of the insertion tube 25 . Simultaneously with this inflow of air, the drainage hole 35, which had been closed by the shaft valve part 34 of the control shaft 18 when the cutoff valve 21 was opened, is separated from the O-ring 36 of the shaft valve part 34, and the small diameter part 37 is located. All the water in the flow channel 4 is discharged, completely eliminating the cause of freezing accidents.

Next, in order to circulate water, when the handle 38 screwed and fixed to the upper end of the insertion tube 25 is rotated once, the eccentric cam 39 fixed to the lower end of the insertion tube 25 is rotated once. This one rotation is transmitted to the operator's hand of the handle 38 as an impact by the plunger 41 pressed against the outer peripheral collar 40 of the insertion tube 25. With this rotation, the eccentric cam 39 presses the pressing pin 43 fixedly protruding from the upper surface of the control shaft 18 and positioned close to the eccentric cam 39 during the sliding of the control shaft 18, thereby returning the control shaft 18 to its original position. When the control shaft 18 returns to its original position, the cutoff valve 21 opens the inlet 3 and starts introducing tap water into the flow channel 4.

At the same time as the intake port 3 is opened, the shaft valve part 34 of the control shaft 18 closes the communication between the drain hole 35 and the flow channel 4, and the upper cam 24 pushes up the ventilation shaft 26, and the air intake valve 30 opens the air at the upper end of the insertion tube 25. The suction hole 31 is closed to block the introduction of air from the air suction hole 31 to the flow channel 4. In the above operation, the control shaft 18 is restored by the half-rotation operation of the eccentric cam 39, and when the eccentric cam 39 makes a half-rotation or more, the fitting rod 17 is disengaged from the fitting hole 19 as described above, so that the control shaft 18 is restored. 18 tends to move in the direction of closing the shutoff valve 21 due to the restoring force of the control spring 23.

However, when the fitting piece 44 located on the opposite side of the fitting rod 17 through the fitting hole 19 is pressed by the fitting spring 45 and the fitting hole 19 comes to the upper surface when the eccentric cam 39 rotates half a rotation, The control shaft 18 is fitted to prevent the control shaft 18 from sliding in the closing direction of the cutoff valve 21 . In this state, the control shaft 18 completely returns to its original position, and the control spring 23 is no longer able to close the shutoff valve 21, allowing tap water to stably flow through the flow channel 4.

Due to this circulation, when warm tap water that is higher than the freezing temperature comes into contact with the temperature-sensing part 6 of the thermostat 5, the wax 7 in the temperature-sensing part 6 increases in volume due to the warm water temperature, and the temperature-sensing part shaft increases by the volume increase. 9 and press the fitting rod 17 together with the storage box 14 and the connecting bottle 13 in the direction of the fitting hole 19.

Due to this pressing force, the connecting pin 13 directly connected to the shaft 12 is pushed down against the pressing force of the fitting piece 44 and the entire fitting spring 45.
The fitting rod 17, which has a slightly smaller diameter than the fitting piece 44, is inserted into the fitting hole 19 just before the fitting piece 44 is pressed by the connection member 713 and leaves the fitting hole 19. Maintaining the fixed position of the control shaft 18 even when it is detached by the connecting pin 13, and causing the movement of the control shaft 18 by the restoring force of the control spring 23, will not cause the next freezing temperature drop. Also, in this state, when tap water rises in the summer, etc., and the temperature-sensing shaft 9 is pushed out to the maximum extent, and the connecting bottle 13 strongly presses the fitting piece 44, the fitting spring 45 is pushed out to the maximum extent. If you set the amount of contraction for shaft 1
2. There will be no damage to the thermostat 5, etc.

Similarly, even if the tap water in the flow channel 4 is removed and left as is and the outside temperature becomes high, the fitting rod 17 whose lower surface is in contact with the upper surface of the control shaft 18 will contract the spring 15 and close the storage box. rise inside 14, thermostat 5, shaft 1
There is no need to apply excessive force to the second class.

Further, as the transmission mechanism for transmitting the temperature change of tap water detected by the thermostat 5 as an opening movement of the shutoff valve 21, any mechanism other than the one shown in the above embodiment can be used, and the present invention is not limited to the above embodiment. It's not something you can do.

As described above, in the present invention, the freezing temperature of tap water is sensed from the thermostat installed in the flow channel, and the shutoff valve is closed to stop the introduction of tap water into the flow channel and drain the water. It is possible to reliably prevent freezing accidents caused by forgetting to drain the water or getting colder than expected. In addition, since the shutoff valve is opened manually after draining water, the mechanism can be simplified compared to a system that attempts to open the shutoff valve automatically. Since the condition continues, water is automatically drained repeatedly, and tap water is not wasted and drained, which is convenient.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a sectional view, FIG. 2 is a plan view of the control shaft, and FIG. 3 is a plan view showing the relationship between the eccentric cam and the suppression bin. 3...Inlet 4...Flow channel 5...Thermostat 6...Temperature sensing section 21...Shutoff valve 30...・
・Air intake valve 38...Handle

Claims (1)

[Claims] A thermostat with a temperature-sensing part inserted into the flow channel that connects the tap water inlet and the faucet, and when this thermostat detects the freezing temperature of the tap water in the flow channel, it moves a certain distance and closes the tap water inlet. an air intake valve that moves in response to the movement of the isolation valve and introduces outside air into the flow channel; and a restoration valve that rotates manually to open the isolation valve and close the air intake valve. An antifreeze drain valve characterized by comprising an operating handle.