JPH0536099U - Heater for water pump - Google Patents

Abstract

(57) [Summary] [Purpose] The installation on the water pump is reliable and reliable,
(EN) Provided is a heater for a water pump, which has excellent safety and high heat transfer efficiency. [Structure] A resistance element having lead wires 2 made of covered electric wire at both ends is housed in a ceramic case 11 and is filled with an inorganic insulator 12. At least one surface of the ceramic case is a water pump. It has a curved surface 11a that is substantially along the outer peripheral surface. Further, the resistance element is formed into a curved shape substantially along the curved surface 11a, and further, the three surfaces of the heater are heat insulating sheets.
Cover with 13 to prevent unnecessary heat dissipation.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an antifreezing heater for a water pump used in a water heater with a reheating function.

[0002]

[Prior Art]

 The water pump has, for example, a rated output of 30 to 50 W, an outer diameter dimension of 85 mmφ, and a mounting surface width of about 20 mm. As a conventional heater (rated power of 15 to 30 W) attached to this water pump, as shown in FIG. 5, for example, the resistance element 1 is covered with silicone rubber, and the external lead cords 2 are connected to both ends by the connector 3 as shown in FIG. The adhesive tape 4 or the like was used to adhere to the surface of the metal foil 5, which was used.

One surface of the heater configured as described above is attached in close contact with the outer peripheral surface of the liquid pool tank portion of the water pump, and Joule heat generated by energizing the heater is applied to the tank to freeze the liquid inside. I was trying to prevent.

[0004]

[Problems to be solved by the device]

 However, such a heater is usually fixed to the tank part using adhesive tape, but water drops due to dew condensation enter the adhesive surface or deterioration due to heating over time causes the tank surface to gradually disappear. Not only did it lift up from the ground, the heat transfer efficiency dropped dramatically, but it eventually peeled off, which could lead to a serious accident.

The present invention is intended to solve such a problem, and provides a heater for a water pump, which is reliably attached to the water pump, has excellent reliability and safety, and has high heat transfer efficiency. With the goal.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention has a structure in which a resistive element with a lead wire made of a covered electric wire is housed in a ceramic case and is filled with an inorganic insulator, and at least one surface of the ceramic case is The water pump has a curved surface that is substantially along the outer peripheral surface of the water pump.

Further, the resistance element housed in the ceramic case has a curved shape substantially along a curved surface provided on the ceramic case, and further has three surfaces excluding the lead wire drawing surface of the ceramic case and the mounting surface to the water pump. Is covered with a heat insulating sheet.

[0008]

[Action]

 According to the above configuration, since the resistance element is covered with the ceramic case and the filling material, the reliability and safety of the heater are extremely high, and the curved surface provided on the case is in close contact with the outer peripheral surface of the water pump, so that the heat transfer is prevented. Efficiency is also high.

Further, in the case where the resistance element is curved corresponding to the curved surface of the case, the heat distribution becomes uniform, and the heat dissipation that becomes ineffective by covering the outer surface with the heat insulating sheet decreases, Use efficiency of heat becomes high.

[0010]

【Example】

 Hereinafter, embodiments will be described in detail with reference to the drawings. FIG. 1 shows a heater 10 for a water pump according to an embodiment of the present invention, in which 11 is a ceramic case, one surface of which is a curved surface 11a which is substantially along the outer peripheral surface of the water pump. Inside the ceramic case 11, there is housed a resistance element in which the lead wire 2 made of a covered electric wire is joined at both ends. Reference numeral 12 is an inorganic insulator filled in the ceramic case 11 so as to bury the resistance element.

Reference numeral 13 is a heat insulating sheet made of, for example, artificial mica, which covers three surfaces of the ceramic case 11 in order to suppress heat dissipation from surfaces other than the mounting surface of the heater 10 to the water pump as much as possible. ..

When the water pump heater 10 having the above-described structure is attached to the pump, the heater 10 is placed on the bracket 15 as shown in FIG. 2, for example, and the tip of the fixed claw 15a is provided as shown in FIG. After being bent and fixed, the bracket 15 is attached in close contact with the outer peripheral surface of the liquid pool tank portion of the water pump 16, and the mounting portion 15b is screwed to the pump flange portion.

The water pump heater 10 according to the present embodiment adopts such a mounting method, so that the mounting is reliable, and one surface of the heater is adhered to the pump through the bracket 15 as in the conventional case. Since it does not float or fall off, it is extremely safe, highly reliable, and has good heat transfer efficiency. Further, since the heat insulating sheet 13 is covered, the heat dissipation can be suppressed, and the heat utilization efficiency is also improved.

FIG. 4 shows another embodiment of the present invention, in which the opposing side surfaces of the ceramic case 21 are both curved surfaces, and the resistance element has a curved shape substantially along the curved surface. 23 is stored, and the inorganic insulator 12 is filled from above.

In the case of the present embodiment, since the shape of the resistance element 23 is substantially along the mounting surface of the ceramic case 21 to the pump, the temperature distribution on the mounting surface is substantially uniform, and the heat transfer efficiency is correspondingly increased. Has the advantage that

[0016]

[Effect of the device]

 As described above, according to the present invention, the heater itself is structurally solid, the mounting on the pump is mechanically stable, and the safety is high, and the heater when mounted on the pump is high. Since the surface is in close contact with the outer peripheral surface of the pump, the heat transfer efficiency is extremely high.

Further, when the resistance element is curved along the curved surface of the case, the heat distribution becomes uniform, and by covering the outer surface with a heat insulating sheet, the heat utilization efficiency becomes high, which is a great effect. Is played.

[Brief description of drawings]

FIG. 1 is a perspective view of a heater for a water pump according to an embodiment of the present invention.

FIG. 2 is a view showing a bracket for mounting the heater on a pump.

FIG. 3 is a diagram showing a state in which the heater is attached to a pump.

FIG. 4 is a plan view of a water pump heater according to another embodiment of the present invention.

FIG. 5 is a perspective view of a conventional example.

[Explanation of symbols]

2… Lead wire, 10,20… Heater for water pump, 11,21… Ceramic case, 11a… Curved surface, 12
… Inorganic insulator.

Claims (3)

[Scope of utility model registration request] 1. A heater for preventing freezing of a pump, which is closely attached to an outer peripheral surface of a water pump used for a water heater and the like, wherein a resistance element with a lead wire made of a covered electric wire is housed in a ceramic case. A heater for a water pump having a structure filled with an inorganic insulating material, wherein at least one surface of the ceramic case has a curved surface substantially along the outer peripheral surface of the water pump. 2. The heater for a water pump according to claim 1, wherein the resistance element housed in the ceramic case has a curved shape substantially along a curved surface provided on the ceramic case. 3. The heater for a water pump according to claim 1, wherein three surfaces of the ceramic case except the lead wire lead-out surface and the mounting surface to the water pump are covered with a heat insulating sheet.