JPH0447552Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a pressure detection device for detecting the water level of a bathtub in a hot water reheating type bath device such as a bath kettle that can automatically reheat hot water. It is something.

(Prior art) In a bathtub that can automatically reheat hot water, it is necessary to detect the water level in the bathtub, for example, when automatically adding hot water into the bathtub. A water level sensor is installed. For example, as shown in FIG. 4, such a water level sensor is constructed by attaching a mounting member c provided with a water guide passage b to a hot water pipe communicating with a bathtub, such as a return pipe a from the bathtub, and attaching a pressure sensor d such as a semiconductor pressure sensor to this mounting member c. is installed and configured. In this configuration, pressure corresponding to the water level in the bathtub is transmitted from hot water in pipe a to hot water in water guide passage b to pressure sensor d, and the water level is detected from the pressure detected in this way. The pressure sensor d connects a pressure sensitive body e such as a semiconductor element to a pressure sensitive chamber f.
In addition, a diaphragm g is provided in the pressure sensitive chamber f on the side that comes into contact with hot water, and a sealing liquid such as silicone oil is sealed in the pressure sensitive chamber f partitioned by the diaphragm. It consists of

(Problem to be solved by the invention) Conventionally, a sealing liquid such as silicone oil is sealed in the pressure sensitive chamber f partitioned by the diaphragm g, which requires skill and is expensive. At the same time, the influence of the diaphragm appears on linearity, temperature characteristics, etc.

The present invention aims to solve such problems.

(Means for solving the problem) The configuration of the present invention is shown in Figs. 1 to 3 corresponding to the embodiment.
With reference to the drawings, the pressure sensor 1 is connected at one end l of a pressure-conducting pipe 4 to the upper part of a pressure-sensing chamber 3 in which a pressure-sensing body 2 of the pressure sensor 1 is installed.
A connecting member 5 for connecting to a pipe or the like is provided at the other end u of the pressure guiding pipe 4, and the pressure sensing chamber 3 is connected to the pressure guiding pipe 4 via the pressure guiding pipe 4.
The sealing liquid 6 is filled in the pressure pipe 4 to a predetermined height.
The sealing liquid 6 is filled in the chamber, and the part above the surface of the sealing liquid 6 is open to the atmosphere. As another configuration, the device of the present invention is configured such that a vertical loop 7 is formed at a suitable position on the other end u of the pressure guiding pipe 4 in the device described in the first paragraph.

(Function and Examples) In the above configuration, the device of the present invention can be attached to the upper part of the hot water return pipe 8 from the bathtub in a hot water reheating type bath device using the connecting member 5 such as a cap nut. Used by connecting to member 9.

Therefore, the pressure of hot water corresponding to the water level in the bathtub (not shown) is transferred from the air in the mounting member 9 through the hot water in the return pipe 8 to the air layer 10 in the pressure guiding pipe 4 and the sealing liquid 6 such as silicone oil. The water pressure is transmitted directly to the pressure sensitive body 2 via the pressure sensitive body 2, and the water level in the bathtub can be detected by the water pressure of the hot water detected in this way. The hot water in the return pipe 8 rises to a point where its water pressure balances the air pressure in the mounting member 9 and the air pressure in the air layer 10, but it does not rise any further, and the pressure in the pressure pipe 4
Do not penetrate inside.

When the device of the present invention is incorporated into a hot water reheating bath device or is incorporated into a bath pot, it may be tilted and the upper surface of the sealing liquid 6 may be lower than the top 11 of the pressure pipe 4. If it is located above, in the configuration shown in FIG. 1, the pressure guiding pipe 4 and the sealing liquid 6 in the pressure sensitive chamber 3 may all flow out.

On the other hand, as shown in Figures 2 and 3,
If a vertical loop is formed at a suitable location on the other end u side of the pressure guiding pipe 4, the sealing liquid 6 above the loop 7 will flow out, but the sealing liquid 6 below will not flow out. By properly configuring the position of the sealing liquid 6, the necessary amount of sealing liquid 6 can be secured.

(Effect of the invention) As described above, the present invention connects one end of the pressure guiding pipe to the upper part of the pressure sensitive chamber in which the pressure sensitive body of the pressure sensor is installed, and connects the other end of the pressure guiding pipe to piping, etc. The sealing liquid was filled into the pressure sensitive chamber and the pressure guiding pipe to a predetermined height through the pressure guiding pipe, and the upper part of the sealing liquid was opened to the atmosphere. It is easy to manufacture, including filling with a stopper liquid, and costs can be reduced, and since a diaphragm is not used, its characteristics are not affected. In addition, by forming a vertical loop in the pressure pipe, the present invention prevents unnecessary leakage of sealing fluid even if the pressure pipe is tilted during transportation or construction of the bathtub or other parts. This has the effect of being able to prevent.

[Brief explanation of the drawing]

1 and 2 are explanatory sectional views of main parts corresponding to embodiments of the device of the present invention, FIG. 3 is an explanatory sectional view showing an example of the usage state of the device of the present invention, and FIG. 4 is a conventional sectional view of the device of the present invention. It is an explanatory cross-sectional view of the main part of an example. Code 1...Pressure sensor, 2...Pressure sensitive body, 3...
Pressure sensitive chamber, 4... Pressure pipe, 5... Connection member, 6
... Sealing liquid, 7 ... Loop, 8 ... Return piping, 9
...Mounting member, 10...Air layer, 11...Top part,
u...one end, l...other end.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) One end of the pressure guiding pipe is connected above the pressure sensitive chamber in which the pressure sensitive body of the pressure sensor is installed, and the other end of the pressure guiding pipe is connected to piping, etc. Provide the members,
The hot water supply adder is characterized in that the pressure sensitive chamber and the pressure guiding pipe are filled with sealing liquid to a predetermined height through the pressure guiding pipe, and the upper part of the liquid level of the sealing liquid is open to the atmosphere. Pressure detection device for detecting bathtub water level in fire-burning bath equipment. (2) In the device described in paragraph 1, a pressure for detecting the bathtub water level in a hot water reheating bath device is characterized in that a vertical loop is formed at a suitable location on the other end side of the pressure guiding pipe. Detection device.