JPH0712086A - Pump device - Google Patents

Abstract

PURPOSE:To prevent freezing by means of a heater which is excellent in safety and has high thermal insulation efficiency by arranging a positive temperature coefficient resistance element heater under a pump casing in order to heat water staying in the casing so as not to freeze. CONSTITUTION:When a pump is stopped, the inside of a water channel is held in a full water condition. When an atmosphere temperature becomes 0 deg.C or below in this condition, staying water in a part constituting the pump freezes, and the pump constituting part is broken down. In order to prevent this, when a temperature becomes a constant temperature or below, a temperature relay 25 is closed, and an electric current is carried to a positive temperature coefficient resistance element heater 19, and it is heated. A part of generated heat is conducted to a casing 2 through a heater receiving part 18, and reaches a certain constant temperature respectively by a temperature rise in the staying water in the casing 2 or by circulation of the staying water in a check valve 4 or a separating chamber 7, and can prevent freezing. A part of the heat is conducted to a suction joint 5 through a heater presser 20, and the staying water in the suction joint 5 and a suction flange 6 rises in temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump device, and more particularly to a pump device having an antifreezing heater.

[0002]

2. Description of the Related Art A conventional pump device is provided with a lamp receptacle for protection against freezing, and a customer installs a lamp as necessary to prevent freezing and damage to parts due to freezing. A device related to this type of device is, for example, the device described in Japanese Utility Model Publication No. 45-7810.

[0003]

However, the conventional pump device is highly dangerous because the lamp receptacle is always energized, and the lamp itself has a long life due to inrush current at the time of starting the pump, dew condensation, or the like. It became shorter, and improvements were needed in terms of freeze prevention and safety.

An object of the present invention is to obtain the same protection effect as a lamp by using a heater which is excellent in safety and heat retention efficiency.

[0005]

The features of the present invention include a casing having an impeller that is rotated by a rotating shaft of an electric motor to perform a pumping action, and a suction valve that supplies water to the impeller and has a check valve on the way. A pump device is comprised of a joint, a discharge joint that discharges water from the impeller and has a separation chamber in the middle, and a positive temperature coefficient resistance element heater that heats water that has accumulated in the casing so as not to freeze.

[0006]

According to such a pump device, the heat generated by the positive temperature coefficient resistance element heater is transferred to the accumulated water in the casing 2 and the temperature rises to prevent freezing.

Further, by using the positive temperature coefficient resistance element heater, the lower the temperature is, the larger the amount of heat generation is, so that the heating is performed, so that the heat retention efficiency can be improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

A rotating shaft (not shown) of the electric motor 1 penetrates the casing 2, an impeller (not shown) is fixed to the rotating shaft in the casing 2, and a separation chamber 7 is provided in the upper part of the casing. These are fixed to the pump base 3. A check valve 4 and a suction joint 5 are watertightly fixed to the upstream side of the casing 2. A suction flange 6 to which a commercially available valve socket can be screwed is fixed to the suction joint 5 in order to allow piping from a water source.

On the downstream side of the separation chamber 7, a flow switch body 8, a float 10 containing a magnet 9, a reed switch 11 can be inserted, and a pressure switch 13 can be screwed on. The switch 14 is watertightly fixed via the discharge joint 15. A tank joint 16 to which a pressure tank 26 is screwed is formed downstream of the flow rate switch 14. To the tank joint 16 and the flow switch body 8, a discharge flange 17 to which a commercially available valve socket can be screwed is fixed so that piping to each faucet is possible.

A heater receiving portion 18 is integrally provided on the lower portion of the casing 2, and one surface of the positive temperature coefficient resistance element heater 19 is in contact with the end surface of the heater receiving portion 18. The other surface is in contact with the heater retainer 20 to which the positive temperature coefficient resistance element heater 19 can be adhered, and the heater retainer 20 is in contact with and adhered to the suction joint 5. That is, the heater retainer 20 has a hole 22 fixed with a bolt 21 at the same time as the suction joint 5, and an arm bending portion 23 for giving a spring action so as to come into contact with the heater receiving portion 18 of the casing 2. It is configured.

As shown in the circuit diagram of FIG. 4, the positive temperature coefficient resistance element heater 19 is connected in series with a temperature relay 25 fixed to the central portion of the electric motor 1, and these are connected in parallel with the electric motor 1 circuit. .

The pressure switch 13 and the flow rate switch 14 are connected in parallel and are connected in series to the electric motor 1 circuit.

The pump device is constructed by covering the pumps constructed as described above with the pump cover 24.

The operation of the pump will be described below. The water accumulated in the pressure tank 26 flows out by opening the water faucet, the pump internal pressure decreases, the pressure switch 13 turns on, the electric motor 1 rotates, and the impeller (not shown) in the casing 2 rotates. ,
It sucks up water from a water source, pressurizes it, and discharges it. According to the above-mentioned path, it flows out from the suction flange 6 to the discharge flange 17. In the process, the float 10 in the flow switch 14 floats up, and the magnet 9 in the float 10 causes
Reed switch 11 is closed and flow rate switch 14 is ON.
However, continuous operation is performed.

When the water faucet is closed, the internal pressure of the pump rises and the pressure switch 13 is turned off, but the flow rate switch 14 continues the continuous operation. When the faucet is further closed, the float 10 sinks due to the weight of the float 10 and the magnet 9, and the flow rate switch 14 is turned off.
Stops. The pump device operates by repeating the above. Therefore, when the pump is stopped, the water passages of the joints are kept full of water. In this state, when the ambient temperature becomes 0 ° C. or lower, the accumulated water in the components that make up the pump freezes, and the components of the pump are destroyed. In order to prevent this, a temperature relay 25 is installed that can energize the heater 19 when the temperature falls below a certain temperature. Therefore, when the temperature becomes equal to or lower than a certain temperature, the temperature relay 25 is closed, the energization of the positive temperature coefficient resistance element heater 19 is started, and the positive temperature coefficient resistance element heater 19 generates heat. Part of the heat generated by the positive temperature coefficient resistance element heater 19 is the heater receiving portion 18
Through the casing 2, the temperature of the accumulated water in the casing 2 further rises, and the accumulated water in the check valve 4 and the separation chamber 7 circulates to a certain temperature to prevent freezing. . Further, a part of the heat is transferred to the suction joint 5 via the heater retainer 20, and the accumulated water in the suction joint 5'and the suction flange rises in temperature.

[0017]

As described above, according to the present invention, the accumulated water in the casing can be protected from freezing by using the positive temperature coefficient resistance element heater, in which the lower the temperature, the larger the amount of heat generation. It is possible to protect the pump device from freezing by using a heater that is excellent in heat insulation efficiency.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a pump device showing an embodiment of the present invention.

FIG. 2 is a perspective view of the pump device.

FIG. 3 is a perspective view of a main part of the pump device.

FIG. 4 is a circuit diagram of the pump device.

[Explanation of symbols]

1 ... Electric motor, 2 ... Casing, 3 ... Pump base, 5 ...
Suction joint, 6 ... Suction flange, 7 ... Separation chamber, 18 ... Heater receiving part, 19 ... Positive temperature coefficient resistance element heater, 20 ...
Heater retainer, 24 ... Pump cover.

Claims (1)

[Claims] 1. A casing having an impeller rotated by a rotating shaft of an electric motor to perform a pump action, a suction joint having water supplied to the impeller and having a check valve in the middle, and water discharged from the impeller. A pump device comprising a discharge joint having a separation chamber in the middle thereof and a positive temperature coefficient resistance element heater for heating the water accumulated in the casing without freezing.