JPH0421085Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a temperature detector, and is suitable for detecting, for example, the temperature of water flowing through a water supply pipe or a water supply pipe of a water heater.

(b) Conventional technology In recent years, as disclosed in Japanese Patent Application Laid-Open No. 57-155046, a heating device having a once-through type heating device and a hot water storage tank,
In a water heater that sends water from a hot water storage tank to a heating device, returns the hot water heated by the heating device to the hot water storage tank, stores the hot water, and then supplies hot water. A detection device controls the operation of the circulation pump.

As this type of temperature detection device, the one shown in FIG. 3 is generally used. In Fig. 3, 1 is a liquid pipe through which liquid such as hot water flows, 2 is an opening provided in the upper pipe wall of this liquid pipe 1, and 3 is attached to this opening 2 in a watertight manner by welding, etc., and an annular ring is attached to the inner periphery. A metal socket 4 is provided with a protrusion 3a and a threaded portion 3b on the outer periphery.The metal socket 4 consists of a small-diameter temperature-sensing element storage part 4a and a large-diameter mounting base 4b, and the temperature-sensing element storage part 4a is inserted through the socket 3. 5 is a metal temperature-sensing element protection tube that faces the inside of the liquid tube 1 and has a mounting base 4b inserted inside the socket 3; A temperature sensing element such as a thermistor, 6 is a lead wire of the temperature sensing element 5, 7 is an outlet wire, 8 is filled in the temperature sensing element protection tube 4, and a connection between the temperature sensing element 5, the lead wire 6, and the outlet wire 7. 9 is a rubber O-ring interposed between the protrusion 3a of the socket 3 and the mounting base 4b of the protective tube 4; 10 is the socket 3;
This is a pressing body that is screwed together and presses the mounting base 4b of the protection tube 4 to compress the O-ring 9, and a metal cap nut is used.

In the above-described temperature detection device, the heat received in the temperature-sensing element storage part 4a of the temperature-sensing element protection tube 4 is transmitted to the mounting base 4b, the pressing body 10, and the socket 3. The amount of heat given to 5 will be less. Furthermore, since heat transfers until all of these parts reach the same temperature, there is a drawback that the response time of the temperature detection device is slow.

(c) Problems to be solved by the invention The problem to be solved by this invention is to reduce the transfer of heat from the temperature-sensitive element storage part to other parts and to speed up the response time.

(d) Means for solving the problem According to this invention, the above problem is solved by a socket that is installed in a watertight manner in an opening provided in a wall facing the liquid and has an annular protrusion on the inner periphery, and A temperature sensing element protection tube inserted into the liquid through the socket, a mounting flange fixed to the outer wall of the temperature sensing element protection tube located inside the socket, a pressing body screwed into the socket, and a protrusion of the socket. The solution is to provide a heat insulating member interposed between the mounting flange and the mounting flange, and between the mounting flange and the pressing body, and at least one of the thermal insulating members is made of an elastic material and is compressed by the pressing body. be done.

(E) Function The mounting flange is fixed to the outer wall of the temperature sensing element protection tube located inside the socket, and this mounting flange is sandwiched between the annular protrusion of the socket and the pressing body via a heat insulating member. Heat transfer from the hot element protection tube to the pressing body and the socket is prevented by the heat insulating member. Further, since the mounting flange may be extremely thin and has a small heat capacity, the heat of the liquid is quickly transferred to the temperature sensing element via the temperature sensing element protection tube.
Moreover, between the protrusion of the socket and the mounting flange,
In addition, one of the heat insulating members interposed between the mounting flange and the pressing body is made of an elastic material and is compressed by the pressing body, so that a part of the heat insulating member comes into close contact with the mounting flange and the socket. Prevent water leaks.

(f) Examples Hereinafter, examples of this invention shown in the drawings will be described.

FIG. 1 shows an embodiment of this invention. In Fig. 1, 11 is a liquid pipe through which liquid such as hot water flows, 12 is an opening provided in the pipe wall of this liquid pipe 11, and 13 is attached to this opening 12 in a watertight manner by welding, etc., and has an annular projection on the inner periphery. 13a is provided, and a metal socket 14 is provided with a threaded portion 13b on the outer periphery.
This is a temperature-sensitive element protection tube exposed to the inside, and is made of SUS metal tube with excellent ductility, with an outer diameter of 2 mm, an inner diameter of 1.5 mm, and a wall thickness of 0.25 mm. 15 is a mounting flange fixed by welding to the outer wall of the temperature sensing element protection tube 14 located inside the socket 13;
It is made of SUS, the same as protection tube 14, and has a plate thickness of 0.5mm. Reference numeral 16 denotes a pressing body screwed onto the threaded portion 13b of the socket 13, and a metal cap nut is used. 17 is a temperature sensing element such as a glass-covered thermistor housed in the closed end of the temperature sensing element protection tube 14; 18 is a lead wire of the temperature sensing element 17;
9 is a lead wire; 20 is an electrically insulating member that is filled in the thermosensor protection tube 14 and covers the thermosensor 17 and the lead wire 18 ; The connected portion of the lead wire 18 and the lead wire 19 and the lead wire 1 are fitted together.
9 is an electrically and thermally insulated insulating tube that protects the insertion portion of the pressing body 16; 22 and 23 are the sockets 13;
It is a heat insulating member interposed between the projection 13a and the mounting flange 15 and between the mounting flange 15 and the pressing body 16. A rubber O-ring is used for the heat insulating member 22, and the heat insulating member 23 is made of cylindrical resin.

The temperature detection device described above connects the mounting flange 15 fixed to the outer wall of the temperature sensing element protection tube 14 to the socket 13.
Since it is located inside and sandwiched between the protrusion 13a of the socket 13 and the pressing body 16 via the heat insulating members 22 and 23, the heat of the liquid such as hot water flowing inside the liquid pipe 11 is transferred to the temperature sensing element. It is possible to prevent the pressure from being transmitted to the pressing body 16 and the socket 13 via the protective tube 14 and the mounting flange 15. In addition, the mounting flange 15 can be extremely thin, and the temperature-sensitive element protection tube 14 is also made of SUS to make the wall thickness as thin as possible to reduce the heat capacity. More heat is applied and response time is shorter. Moreover, the pressing force from the pressing body 16 is transmitted to the mounting flange 15 via the heat insulating member 23 and compresses the heat insulating member 22, so that the heat insulating member 22 is pressed against the protrusion 13 of the socket 13.
a and the inner peripheral wall and the mounting flange 15,
Water leakage can be reliably prevented.

FIG. 2 shows another embodiment of the invention, in which parts common to those shown in FIG. 1 are given the same reference numerals. 2, the difference from that in FIG. 1 is that a projection 23a is provided on the heat insulating member 23, and the outer periphery of the mounting flange 15 is covered with this projection 23a. In this way, heat transfer between the mounting flange 15 and the socket 13 is more reliably prevented.

In the above embodiment, the thermal insulating member 22 is made of an elastic material, but the thermal insulating member 23 or both the thermal insulating members 22 and 23 may be made of an elastic material. Further, the pressing body 16 may be screwed into the inner peripheral side of the socket 13.

(g) Effects of the invention This invention is structured as described above, so
While preventing heat transfer from the thermosensitive element protection tube to other components with a heat insulating member, the heat capacity of the member supporting the thermosensor protection tube can be reduced, and the heat of the liquid can be transferred to the thermosensor through the thermosensor protection tube. The information is transmitted quickly and the response time can be significantly shortened. Furthermore, since at least a portion of the heat insulating member is made of an elastic material and is also used as a gasket when the temperature sensing element protection tube is attached, water leakage can be reliably prevented.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a temperature detecting device according to an embodiment of the present invention, FIG. 2 is a sectional view showing another embodiment of the device according to the invention, and FIG. 3 is a sectional view showing an example of a conventional device. 11...Liquid pipe, 12...Opening, 13...Socket, 13a...Protrusion, 14...Temperature sensing element protection tube,
15... Mounting flange, 16... Pressing body, 22,
23...Heat insulation member.

Claims (1)

[Scope of utility model registration request] A socket that is watertightly attached to an opening provided in a wall facing the liquid and has an annular protrusion on the inner periphery, a temperature-sensitive element protection tube that is inserted into the liquid through the socket, and a temperature-sensitive element protection tube that is located inside the socket. Heat generated between the mounting flange fixed to the outer wall of the temperature-sensing element protection tube, the pressing body screwed into the socket, the protrusion of the socket and the mounting flange, and between the mounting flange and the pressing body. 1. A temperature detection device comprising: an insulating member; at least one of the thermally insulating members is made of an elastic material and is compressed by a pressing body.