JP3062979B2 - solenoid valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve, and more particularly, to a solenoid valve which incorporates a temperature sensor and a heater and can be easily disassembled.

[0002]

2. Description of the Related Art In cold regions, water temperature falls at night and freezes, and accidents such as bursting of water pipes and cracks frequently occur. For this reason, the present inventor uses a flexible rubber or plastic hose as a water pipe, and when the temperature drops at night, drains the water in the hose from the middle part of the hanging hose. We devised a water supply system that solved the problem.

[0003] Although it is desirable to use an electromagnetic valve for draining water from such a water supply piping device, there is a risk that a normal electromagnetic valve will not operate due to freezing of water droplets. The inventor of the present invention has conducted intensive research on what structure is desirable as a solenoid valve for drainage provided in the middle of the hose in such a water supply pipe device, and as a result, the present invention was completed. It is a thing.

[0004]

SUMMARY OF THE INVENTION The present invention incorporates a temperature sensor and a heater so that when the air temperature or water temperature falls to a predetermined temperature, the heater is automatically operated to heat the periphery of the valve. It is another object of the present invention to provide an electromagnetic valve capable of preventing the operation of the valve due to the freezing of water droplets, and also enabling the bottom member to be easily removed and disassembled.

[0005]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a valve having a bottom opening of a valve body, a passage whose both ends project as water passages at symmetrical positions of side surfaces, and a center of the passage. A valve seat is formed at a branch point of a drain passage that branches downward from the portion, and a bottom member provided with an air communication port communicating with the inside of the valve body at the center of the passage is detachably attached. A valve body is fixed to the lower end of a shaft rod having an upper end portion detachably connected to a plunger, an opening / closing plate of an air flow opening is fixed to a central portion in the axial direction, and a temperature sensor and a heater are further mounted on the bottom member. , While a heater is provided on the opening / closing plate of the air flow opening.

[0006]

Next, the operation of the present invention will be described. When the temperature sensor detects that the temperature has become freezing, the solenoid coil is energized, the valve body rises from the valve seat, and is drained from the drain passage. At this time, the air circulation port is also opened, so that the air flows into the passage to improve the drainage of water. On the other hand, the heater automatically starts operating upon detection of the temperature sensor, and heats the periphery of the valve body to prevent freezing of water droplets. Therefore, the valve can be maintained in a state where the valve can be operated at any time even when the air temperature or the water temperature drops. The heater also heats the opening / closing plate of the air circulation port by the heater at the same time as the heating of the valve body, so that the opening / closing of the water drop is not hindered by the freezing of water droplets. Also, when the temperature and water temperature rise and become higher than the predetermined temperature,
The heater automatically stops operating.

Further, when disassembling, first, the set screw is removed, the bottom member is removed from the valve body, and then the connecting pin is pulled out to remove the shaft rod from the plunger.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In the figure, reference numeral 1 denotes a solenoid valve main body. 2 is a valve body, 3 is a solenoid coil, and 4 is a magnetic pole core. Reference numeral 5 denotes a plunger, and 6 denotes a shaft rod having an upper end connected to the plunger 5, and is supported by a support plate 7a in the valve body 2 .
The support tube 7 is supported so as to be able to move up and down freely. The shaft 6 is connected to the plunger 5 via a connecting pin 8 so that the shaft 6 can be easily removed by pulling out the connecting pin 8. Ma
In addition, the shaft 6 includes a support plate 7a and an opening / closing plate for an air circulation port, which will be described later.
Always move downward through the coil spring 6a provided between
May be energized.

Reference numeral 9 denotes a bottom member which is detachably attached to the bottom opening of the valve body 2, and has a passage 12 having openings 10 and 11 at both ends symmetrically located on the side surfaces thereof, and a center of the passage 12. Drainage passage 1 branching downward from the part
3 and 14, a valve seat 15 is formed at a branch point between the drain passages 13 and 14, and an air flow port 16 communicating with the inside of the valve body 2 is provided at the center of the passage 12. In the illustrated embodiment, the drain passages 13 and 14 are provided.
However, this is for draining water from the large-diameter drain passage 13 and for introducing air from the small-diameter drain passage 14, and both may have the same diameter. 1
Reference numerals 7 and 17 denote stop screws for connecting the bottom member 9 to the valve body 2.

Reference numeral 18 denotes a valve body fixed to the lower end of the shaft 6 for opening and closing the drain passages 13 and 14. Further, the valve element 18 raises the plunger 5 by energizing the solenoid coil 3, thereby raising the plunger 5 to an open state. Thus, the water in the passage 12 is discharged through the drain passages 13 and 14.

Reference numeral 19 denotes an air flow opening / closing plate fixed to the center of the shaft 6 in the axial direction. 20a is the above
A disk-shaped packing provided on the lower surface of the opening / closing plate 19 of the air flow opening . Incidentally, instead of the packing 20, as shown in FIG.
O-ring shaped packing 20b may be used. Reference numeral 21 denotes a temperature sensor disposed on the bottom member 9, which detects an air temperature or a water temperature and sends an operating signal to the solenoid coil 3 and a heater described later.

Reference numeral 22 denotes a heater disposed on the bottom member 9, which is activated when the temperature drops, and which is used for drainage passages 13 and 14.
Is heated to prevent freezing of water droplets. This can prevent the valve body 18 from malfunctioning due to freezing of water droplets.

Reference numeral 23 denotes a heater disposed on the opening / closing plate 19 of the air flow opening so as to prevent the operation of the opening / closing plate 23 of the air flow opening due to freezing of water droplets.

[0014]

The present invention has the above-described structure and operation,
The temperature or water temperature is detected by a temperature sensor, and when the temperature drops to a predetermined temperature, the heater is automatically operated to heat the valve body, so that the valve is not operated due to freezing of water droplets. This can be reliably prevented. Further, the bottom member can be easily removed from the valve body and disassembled.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional front view of an embodiment of the present invention.

FIG. 2 It is explanatory drawing of another example of packing.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Solenoid valve main body 2 Valve body 3 Solenoid coil 4 Magnetic pole iron core 5 Plunger 6 Shaft rod 6a Coil spring 7 Supporting cylinder 7a Support plate 9 Bottom member 10 Opening of passage 11 Opening of passage 12 Passage 13 Drain passage 14 Drain passage 15 Valve seat 16 Air flow port 18 Valve element 19 Opening / closing plate 20a of air flow port Disc-shaped packing 20b O-ring packing 21 Temperature sensor 22 Heater 23 Heater

Claims (1)

(57) [Claims] 1. A valve seat is provided at a bottom opening of a valve body at a symmetrical position of a side surface, a passage whose both ends protrude as a water passage, and a branch point of a drainage passage branching downward from a central portion of the passage. A bottom member provided with an air flow opening communicating with the inside of the valve body at the center of the passage is detachably attached, and a lower end of the shaft is detachably connected to an upper end of the passage to a plunger. A valve body is fixed to the opening, and an opening / closing plate of an air flow opening is fixed at a central portion in the axial direction. Further, a temperature sensor and a heater are provided on the bottom member, and a heater is provided on the opening / closing plate of the air flow opening. An electromagnetic valve characterized by being provided.