JPH06103118B2 - Electric instant water heater - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an electric instant water heater.

2. Description of the Related Art As shown in FIG. 5, a pressure detector 12 of a conventional electric instant water heater comprises a pressure detection unit 1 and a switch unit 2, and the pressure detection unit 1 receives a pressure for guiding a pressure applied to a tank. It consists of a pipe 3a, a pressure receiving plate 3 for detecting the pressure, and a raised button 4 for transmitting the pressure to an electric circuit.
It is composed of a switch 5 for turning off and a mounting bracket 6 for fixing the switch 5. The switch 5 is fixed to a mounting bracket 6 with two screws 7.

A conventional electric instant water heater has a tank 8 as shown in FIG.
Heater 9, water inlet pipe 10, hot water outlet pipe 11, the pressure detector 12
Is watertightly joined, a flow valve (not shown) is provided on the primary side of the water inlet pipe 10, and a shower head 13 is attached to the outlet of the hot water outlet pipe 11. Depending on the opening of the flow valve (not shown), water sequentially flows into the water inlet pipe 10, the tank 8, the hot water outlet pipe 11, and the shower head 13, and when the pressure in the tank 8 reaches the preset pressure, the pressure detector 12, the heater 9 is turned on, and the heater 9 warms the water in the tank 8 at any time, and the water flows from the shower head 13 through the hot water pipe 11. The hot water temperature at this time is determined by the wattage of the heater 9, that is, the heat generation amount, the incoming water temperature, and the flow rate. Therefore, the flow rate is adjusted to obtain hot water of an appropriate temperature for the shower.
14 is a thermal cutout that shuts off the electric circuit in the event of an abnormality.

Problems to be Solved by the Invention In such a conventional structure, the switch 5 of the pressure detector 12 is fixed to the mounting bracket 6 with two screws 7.
The dimensional variation between the pressure receiving plate 3 and the raised button 4 of the pressure detection unit 1 cannot be avoided. However, in such a structure, the operating point with the switch 5 cannot be adjusted, and as a result, the switch 5 is turned on / off for heating the heater 9 for heating the water at a predetermined operating pressure.
However, the heater 9 is not energized even if the operating pressure is lower than the predetermined operating pressure, or the heater 9 is not energized even when the operating pressure is higher than the predetermined operating pressure. In the former case, the hot water is too hot. Or, in the latter case, there is a problem in use because it does not become hot water.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems by providing a configuration in which the operating point can be easily adjusted with high accuracy, and the adjustment point does not shift even after the adjustment.

Means for Solving the Problems A tank having a heater and a water inlet pipe, a hot water outlet pipe, and a pressure detector that are watertightly joined to the tank are provided, and the pressure detector slides due to pressure applied from the water inlet pipe. It comprises a pressure detection part having a possible shaft and a switch part having a switch for converting the movement of the shaft into an electric signal, and the switch part is swingable at a protrusion protruding from the frame of the pressure detection part at one end thereof. A support part to be attached to the switch part, and an adjusting screw provided on the other end of the switch part,
The operating point of the switch can be adjusted by making the shaft forming the support portion and the adjusting screw orthogonal to each other and screwing the adjusting screw into the frame.

Action The action of this technical means is as follows. In other words, by providing a floating adjustment screw on the pressure detector, it is possible to make delicate adjustments and absorb variations in the operating point of the switch, the size of each component, and assembly variations, and adjust the operating point in the process. In terms of performance, it will be possible to easily adjust the low water pressure operation required in a short time.

As a result, unlike the prior art, it takes no time to adjust the operating point in the process, and in terms of performance, the low water pressure operation adjustment can be easily performed.

Embodiment One embodiment of the present invention will be described below with reference to the accompanying drawings. In FIG. 3, in the electric instant water heater 15, the water flowing from the inlet 16 enters the tank 19 through the flow valve 17 and the water inlet pipe 18, flows around the heater 20 in the tank 19 and is heated, and the hot water outlet pipe It flows out from the shower head 22 via 21. twenty three
Is a pressure detector. When the water pressure reaches a predetermined pressure, the electric circuit is closed, the heater 20 heats the water, and the flow valve 17
By adjusting the flow rate, the hot water of appropriate temperature is obtained. 25 is a thermal cutout that shuts off electricity in the event of an abnormality and keeps safety.

FIG. 4 shows a detailed view of the pressure detector 23. The water flowing from the inlet 16 flows through the flow valve 17 to the water inlet pipe 18, and the pressure detector 23 is composed of a pressure detector 26 and a switch 27. The pressure detection unit 26 includes a frame 31, a diaphragm 30, a pressure receiving plate 28, a shaft 29, and a bearing.
33, the pressure is applied to the diaphragm 30 when a predetermined pressure is reached, the pressure is transmitted to the switch unit 27 via the slidable integrated pressure receiving plate 28 and the shaft 29, and the electric circuit is closed. The heater 20 of the tank 19 is energized. A detailed view of the switch unit 27 is shown in FIG. Switch part 27
Is attached to the frame 31 of the pressure detection unit 26.

32 is a switch, one end of which is fixed to a mounting bracket 34 with a screw 35. The other end is provided with a fulcrum 36 on a protrusion 31a protruding from the frame 31 of the pressure detection unit 26 and is loosely fitted together with the mounting bracket 34 so as to be swingable. Then, at a position opposite to the fulcrum 36 of the fitting 34 that is loosely fitted so as to be swingable, the fulcrum 36
The adjusting screw 37 is fitted in a direction orthogonal to the swing axis of the.
The adjusting screw 37 is screwed into the frame on the side opposite to the protrusion 31a, and the operating points of the shaft 29 and the switch 32 are adjusted.

2 shows a coil spring on the outer circumference of the adjusting screw 37 of the switch unit 27.
The structure in which 39 is inserted and the distance A between the shaft 29 and the switch 32 is always kept constant is provided so that the operation points can be adjusted more easily.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) By providing a floating adjustment screw on the pressure detector, variations in parts dimensions, variations in assembly, etc. can be absorbed, delicate adjustments can be made easily, and no strict dimensional accuracy requirements are required. Since adjustment can be done in a short time,
The cost can be greatly reduced.

(2) One end of the switch part is used as a fulcrum, and the mounting bracket at the other end of the switch part can be changed with one adjusting screw, making it possible to make delicate adjustments regardless of the size of the water pressure range and easily adjust the operating point.

(3) Since the pressure is transmitted to the shaft that is slidable and is integrated with the pressure receiving plate, it is possible to prevent the malfunction of the switch due to the dimensional variation of parts.

[Brief description of drawings]

FIG. 1 is an enlarged view of a pressure detector according to an embodiment of the present invention, FIG.
FIG. 3 is an enlarged view of a pressure detector according to another embodiment of the present invention, FIG.
a and b are an external view and an internal structure of an electric instant water heater to which the pressure detector of the present invention is applied, FIG. 4 is an internal structure of the pressure detector of the present invention, and FIGS. FIG. 6 is a front view and a side view of the pressure detector, and FIG. 6 is an internal structure diagram of an electric instant water heater to which the conventional pressure detector is applied. 18 ... Water pipe, 19 ... Tank, 20 ... Heater 21 ... Hot water pipe, 23 ... Pressure detector 26 ... Pressure detection part, 27 ... Switch part 29 ... Shaft, 31 ... Frame, 34 ... Mounting bracket 36 ... Support point, 37 … Adjusting screw, 15… Electric instant water heater 32… Switch, 31a… Projection.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuo Takai 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP 57-20633 (JP, A) (JP, U) Actual development Sho 58-190336 (JP, U) Actual public Sho 55-13644 (JP, Y1)

Claims (2)

[Claims] 1. A shaft having a heater and a water inlet pipe, a hot water outlet pipe, and a pressure detector joined in a watertight manner to the tank, the pressure detector being a shaft slidable by a pressure applied from the water inlet pipe. And a switch section having a switch for converting the movement of the shaft into an electric signal. The switch section is swingably mounted on a protrusion protruding from the frame of the pressure detection section. A switch having a support portion and an adjustment screw provided at the other end of the switch portion, the shaft forming the support portion and the adjustment screw are orthogonal to each other, and the adjustment screw is screwed with the frame. An electric instant water heater configured to adjust the operating point. 2. The electric instant water heater according to claim 1, wherein a coil spring is attached to the adjusting screw of the switch portion of the pressure detector.