JPH074562Y2 - Integrated water temperature / water detection sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a sensor used in combination with an antifreeze plug,
More specifically, the present invention relates to an integrated water temperature / water detection sensor in which a water temperature sensor for detecting water temperature and a water detection sensor for detecting the presence of water are integrated.

Problems to be Solved by Conventional Technology and Invention Conventionally, in cold regions and the like, antifreeze plugs have been used to prevent freezing of water in water pipes. In addition to the manual type inside these antifreeze plugs, a temperature sensor is installed at the rising part of the water pipe, and when the temperature sensor detects that the temperature of the water at the rising part is below the set temperature. , There is an automatic type that activates the actuator of the antifreezing plug to activate the spindle of the antifreezing plug to drain the water at the rising part.

An example of such a system for automatically draining water is disclosed in JP-A-61-262275.

The system will be briefly described with reference to FIG.
In the figure, 1 is a rising part of a water pipe, and 2 is a faucet. Reference numeral 3 is a water pipe, and an antifreeze plug 4 is installed on the way. The details of this antifreezing stopper are well known in the art, and thus the description thereof will be omitted. Reference numeral 5 is an integrated water temperature / water detection sensor installed in the rising portion. A water temperature sensor that detects the temperature of water in the rising portion and a water detection sensor that detects whether or not water is present in the rising portion. It is an integrated one. A control circuit 6 receives signals from the water temperature / water detection sensor and controls the operation of the antifreezing plug. Reference numeral 7 is an intake valve. In this system, when the water temperature sensor detects that the water temperature of the rising portion 1 is below the freezing predicted temperature for a certain period of time, the control circuit 6 sends a water removal signal to operate the antifreezing plug 4 to set the water removal state. However, at the same time, the presence of water in the rising portion 1 is monitored by the water detection sensor. The antifreeze plug 4 does not operate normally even if the water drain signal is issued from the control circuit 6, or the antifreeze plug 4
Even if it is activated, if it is detected that water still exists in the rising portion 1 for a certain period of time after the water drain signal is generated due to another cause such as a failure of the intake valve 7, the control is performed. An alarm device connected to the circuit is activated to notify the abnormality.

By the way, FIG. 4 shows a schematic view of an integrated water temperature / water detection sensor conventionally used in such a system.

Reference numeral 11 denotes a plastic main body, which has a cavity 11a therein, and an upper opening thereof is sealed by a connector terminal body 14. Two axial holes 11b are provided from the outside in the lower part of the main body 11, and a stainless steel electrode rod 12 constituting a water detection sensor is inserted into each of them. The body 11 is further provided with an axial hole 11c reaching the vicinity of the lower end of the body 11 at the bottom of the cavity 11a, and a thermistor 13 as a water temperature sensor is arranged in the hole 11c. Reference numeral 15 is a circuit board. The electrode rod 12 is attached to the main body 11 by a screw 16 inserted from the upper surface side of the circuit board 15, and its end face and hole are
The packing 17 provided between the bottom surface of 11b and the bottom surface of 11b is compressed to achieve the seal of this portion. Electrode rod 12
Is electrically connected to each connector terminal 19 via the screw 16, the circuit board 15 and the wiring 18, the thermistor 13 is connected to the lower surface of the circuit board 15, and the through hole of the board 15 and the wiring 18 are connected. It is also connected to one of the connector terminals 19 via. The cavity 11a is filled with the silicon adhesive seal material 20.

However, the conventional integrated water temperature configured as described above
The water detection sensor uses two electrode rods 12 for the water detection sensor. At least one of the insertion holes 11b must be formed off the axial center position of the main body 11, and the difficulty and cost of processing when forming such an off-center hole by machining. In consideration of the above, the main body 11 is integrally formed of plastic. Since the thermistor 13 is arranged in the hole 11c of the plastic body 11, the response of the thermistor 13 is poor due to the influence of the thermal conductivity of the plastic, and there is a problem that the timing of generation of the drain signal is delayed. . Further, since the hole 11b is also die-molded, its dimensional accuracy is inferior, and a small amount of water invades between the hole 11b and the electrode rod 12, and when it freezes, the electrode rod 12 is tilted in the hole 11b and packed 17 The sealing performance is deteriorated, and the water finally reaches the lower surface side of the circuit board 15. Cavity 11
Although the sealing material 20 is filled in a, the circuit board 15
The sealing material does not easily flow to the lower surface side of the. For this reason, the water reaching the lower surface of the circuit board 15 short-circuits the circuit pattern formed on the circuit board 15, causing both the water temperature sensor and the water detection sensor to give an erroneous signal, causing the control operation of the control circuit 6 to be disturbed. Was there.

Means for Solving the Problems The present invention has been made to solve the above problems. According to the present invention, a water detection sensor including two metallic electrode bodies and a water temperature detection sensor including a temperature sensing element are integrated. An integrated water temperature / water detection sensor in which a hole is formed inside one electrode tip of the electrode body, and the water temperature detection sensor is arranged in this hole. Will be provided.

In one embodiment, the water detection sensor includes a cylindrical electrode body having a through hole and a rod-shaped electrode body inserted into the through hole via an insulating member and attached to the cylindrical electrode body. The hole in which the sensor is arranged is formed in the rod-shaped electrode body.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of the present invention. In the figure, reference numeral 31 is a main body made of a conductive metal material, and a screw 31a is engraved on the outer peripheral portion in the vicinity of one end portion thereof, and is attached to the water pipe rising portion 1 in FIG. The tip 31b can contact the water in the water pipe. Reference numeral 32 is a main body cover formed by inserting the main body 31.

A through hole 31c is formed inside the main body 31. A stainless steel electrode rod 35 is inserted into the through hole 31c through an insulating collar 33 and an insulating O-ring holder. The upper end surface of the insulating collar 33 contacts a shoulder portion 31d provided in the middle of the through hole 31c, and the upper end surface of the electrode rod 35 contacts a shoulder portion 33a formed in the middle of the inner through hole of the insulating collar 33. A tapered portion 35a is formed in the approximate center of the electrode rod 35 in the longitudinal direction, and a reduced diameter electrode tip portion 35b is formed in the through hole 3 of the main body 31.
It projects from 1c. A screw is engraved on the lower end of the through hole 31c, and a screw engraved on the outer periphery of the O-ring retainer 34 is screwed into the screw. Two O-rings 36, 37 and a backup ring 38 arranged between them are provided between the O-ring retainer 34 and the insulating collar 33. A taper portion 34a corresponding to the taper portion 35a of the electrode rod 35 is provided in the through hole of the O-ring retainer 34. Therefore, the O-ring retainer 34 is screwed onto the main body 31 and tightened, whereby the electrode rod 35 is attached to the main body 31, and the O-ring is pressed.
36 and 37 provide sealing between the main body 31 and the electrode rod. The body 31 and the electrode rod 35 constitute a water detection sensor.

A blind hole 39 is formed inside the electrode rod 35 from its upper end to the electrode tip 35b, and a thermistor 40 as a water temperature sensor is arranged at the lower end of this blind hole 39. Body 3
1, the electrode rod 35, and the thermistor 40 are connector members 4
It is connected to the connector terminal of 1 using a conductor.

The connector member 41 is attached to the main body cover 32 with a screw 42 through a sealing material 43, and closes an upper opening of the main body 31.
Through hole 31c inside the body 31 and blind hole 39 inside the electrode rod 35
The void is filled with the silicone adhesive sealant 44. Further, the lower end side void portion of the through hole 31c is filled with an epoxy resin.

In the present embodiment configured as described above, since the water detection sensor is configured by the cylindrical main body 31 and the electrode rod 35 that is inserted thereinto, the dimensional accuracy of both should be extremely high. It is possible to improve the sealing effect between the two.

FIG. 2 is a schematic configuration diagram in which the integrated water temperature / water detection sensor of this embodiment is connected to the control circuit 47, and 46 is a resistor. The resistor R is provided to distinguish between the detection of the absence of water by the water detection sensor and the disconnection of the conducting wire. When water is present in the water pipe, the resistor 46 and the main body 31-electrode are provided. rod
Current flows between terminals 42a and 42b through 35, current flows only through resistor 46 when water is present, and current does not flow between terminals 42a and 42b when the conductor is broken. .

Effect of the Invention As is clear from the above description, in the present invention, the water temperature detection sensor is arranged in the hole provided inside the electrode tip of the metal electrode body, so that the water temperature sensor is provided in the plastic body. Compared to the conventional example, it has the effect that the water temperature sensor's responsiveness is far superior due to the good thermal conductivity of the metal, and the timing of issuing the water drain signal is not delayed, and the antifreeze is operated reliably. It can be drained to prevent the water pipe from freezing.

[Brief description of drawings]

FIG. 1 is a sectional view of an integrated water temperature / water detection sensor according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram in which the integrated water temperature / water detection sensor is combined with a control circuit, and FIG. 3 is a water temperature. A configuration diagram showing an example of use of the water detection sensor, and FIG. 4 is a sectional view showing a conventional integrated water temperature / water detection sensor. 30 …… Integrated water temperature / water detection sensor, 31 …… Main body 31c …… Hole, 35 …… Electrode rod 40 …… Thermistor

Claims (1)

[Scope of utility model registration request] 1. An integrated water temperature / water detection sensor which is formed by integrating a water detection sensor composed of two metal electrode bodies and a water temperature detection sensor composed of a temperature sensitive element, and which is used by being attached to a water pipe. Two electrode bodies of the water detection sensor, a tubular electrode body having a through hole inside, and inserted through the through hole of the tubular electrode body through an insulating member, and
The tip is attached in a state of protruding from the cylindrical electrode body, and is composed of a rod-shaped electrode body having a blind hole in which the tip side is closed, and the water temperature detection sensor is provided in the blind hole of the rod-shaped electrode body. An integrated water temperature / water detection sensor, characterized in that a mounting screw for mounting to the water pipe is engraved on the outer peripheral portion of the tubular electrode body.