TWI629857B - Temperature controlling protection device of water pump - Google Patents

Abstract

The invention relates to a temperature control and protection device for a water pump, which comprises a power supply end; a temperature detecting circuit electrically connected to the power supply end, the temperature detecting circuit comprises a thermistor and a plurality of series or parallel connected to each other a comparator circuit is electrically connected to the temperature detecting circuit, the comparing circuit compares a reference voltage and an output voltage of the temperature detecting circuit with a comparator; and a switching circuit, the input terminals are electrically connected The output of the circuit is electrically connected to a water pump; thereby, the temperature detecting circuit can determine whether the temperature of the current pump is too high according to the thermistor, so that the switch circuit determines whether to close the pump.

Description

Pump temperature control protection device

The invention relates to a water pump, in particular to a temperature control protection device capable of selecting a temperature control circuit of different configurations according to environmental factors, which can quickly power the pump motor when the temperature of the pump motor of the water pump is too high. Cut off to prevent the parts or circuits of the pump from being damaged due to the high temperature.

Press, from high-rise buildings, general homes to aquaculture farms and other places will use the Water Pump, which is used to pump water from a low point to a high place, so that people on higher floors or high places can use water or Water is transported to other places for use. The most common problem during use is that the temperature of the pump motor is too high. The pump motor overheating will cause the pump to stop or damage directly. Usually, the cause of overheating is air leakage or being stuck by foreign objects. Especially after the water is stopped in the area, it will cause the pumping motor to be pumped and overheated. In severe cases, it will even burn and cause fire. Therefore, when the water supply is not smooth, you should pay attention to whether there is any problem with the pumping motor of the pump.

The Republic of China Patent Notice No. TW M538276 "Pumping motor water shut-off device" provides a device for automatic power-off when water is not used. When the pipe is stopped or the water volume is small, the flat swinging member of the magnetic component of the valve body accommodation chamber will Keeping the normal sag, once the magnet on the flat oscillating member is away from the reed switch, the contact will be loosened, the transmission line will interrupt the conduction signal, so that the control module will not operate, and the output power line will not be able to output power, so that the pumping motor is powered off. When the water is not pumpable, the pumping motor will not be idling; in addition, the Republic of China Patent Publication No. TW 529858 "Safety Control Circuit Device for Lifting the Pumping Motor" provides a device for sensing the state of overheating when the pumping motor is water-free. When the water source is input in the tube, the pumping motor will increase the temperature due to idling, and the thermistor will sense the temperature and cooperate with the water level detection of the float switch or the water level switch. When the water level is too low, the pump motor will be used. The power supply is cut off, so that the pumping motor stops running to control the pumping motor to stop running when there is no water source.

However, these prior patents mainly deal with power outages in the absence of water, and in the case of other overheating, they cannot provide countermeasures; in addition, due to the different environment in which each pump is placed, the natural temperature difference in some areas The change is quite large, so the outside temperature will directly affect the temperature of the pump. In general, the temperature of the pump motor is simply detected. The operation of the pump motor may be turned off frequently due to changes in the outside temperature, which means that it is not because the pump motor is overheated. When the operation is closed, this process will cause inconvenience in use.

In this way, how to provide a temperature control device that can respond to temperature changes in various environments, and apply it to a water pump, so that the temperature sensing device of the water pump does not easily change the pumping motor of the water pump due to external temperature changes. That is to become the direction that the inventor thought.

Nowadays, the inventor is that in view of the fact that the temperature sensing device of the above-mentioned conventional water pump has many defects in actual use, it is a tireless spirit and is supported by its rich professional knowledge and years of practical experience. Improvements have been made, and the present invention has been developed based on this.

The main object of the present invention is to provide a temperature control and protection device for a water pump, which can select a suitable temperature control circuit according to different environments, whether the pump is installed in a region with large or stable ambient temperature, and can accurately be in the pumping motor. When the temperature is too high, the power of the pumping motor is quickly cut off to prevent the parts or circuits of the pump from being damaged due to the temperature being maintained at a high temperature.

In order to achieve the above-mentioned implementation, the present invention relates to a temperature control and protection device for a water pump, which comprises a power supply end; a temperature detecting circuit electrically connected to the power supply end, the temperature detecting circuit comprises a thermistor and a plurality of two The pole body is electrically connected in series or in parallel; a comparison circuit is electrically connected to the temperature detecting circuit, the comparing circuit compares the output voltage of the temperature detecting circuit and a reference voltage with a comparator; and a switching circuit, the input end thereof The output of the comparison circuit is electrically connected, and the output end is electrically connected to a water pump.

In an embodiment of the invention, the switching circuit is a transistor and a relay electrically connected to the transistor.

In an embodiment of the invention, the water pump includes a motor body and a pump body.

In an embodiment of the invention, the motor body includes a bearing housing, a motor stator, and an impeller.

In an embodiment of the invention, the motor stator houses a motor coil in a steel sheet frame.

In an embodiment of the invention, the reference voltage is output by a voltage dividing circuit.

In an embodiment of the invention, the power supply terminal is powered by a constant voltage type (CONSTANT VOLTAGE) or a constant current type (CONSTANT CURRENT).

In an embodiment of the invention, the temperature detecting circuit further has a resistor connected in series with the thermistor and the plurality of diodes.

The object of the present invention and its structural and functional advantages will be explained in conjunction with the specific embodiments according to the structure shown in the following drawings, so that the reviewing committee can have a more in-depth and specific understanding of the present invention.

Referring to the first figure, a temperature control protection device for a water pump includes a power supply terminal (1), which is powered by a constant voltage type (CONSTANT VOLTAGE) or a constant current type (CONSTANT CURRENT); a temperature detecting circuit (2) electrically connected to the power supply terminal (1), the temperature detecting circuit (2) comprises a thermistor (21) and a plurality of diodes (22) electrically connected in series or in parallel, that is, In the second and third figures, further, the thermistor (21) and the plurality of diodes (22) are connected in series with a resistor Rx; a comparison circuit (3) is electrically connected to the temperature detecting circuit ( 2), the comparison circuit (3) compares the output voltage of the temperature detecting circuit (2) and a reference voltage by a comparator (31), the reference voltage is output by a voltage dividing circuit; and a switching circuit (4) The switch circuit (4) is a transistor (41) and a relay (42) electrically connected to the transistor (41), and the input end thereof is electrically connected to the output of the comparison circuit (3), and the output end is electrically connected. A pump (5).

The pump (5) includes a motor body and a pump body, and the motor body includes a bearing seat, a motor stator and an impeller. The motor stator further houses a motor coil in a steel sheet frame.

In addition, the scope of the invention may be further exemplified by the following specific examples, which are not intended to limit the scope of the invention.

Please continue to refer to the first figure. The temperature detecting circuit (2) of the temperature control protection device of the water pump of the present invention is mainly electrically connected to the plurality of diodes (22) by the thermistor (21), and the thermistor (21) There are two kinds of positive temperature coefficient (PTC) and negative temperature coefficient (NTC). The positive temperature coefficient changes with the increase of temperature, and the negative temperature coefficient is The change of resistance decreases with the increase of temperature, and the present invention adopts a thermistor (21) with a negative temperature coefficient and a specification of 20 kΩ; the diode (22) uses a small signal diode of enamel ( 22) (Small Signal Silicon Diode), when a small current flows through the PN junction of the diode (22), it is quite sensitive to the temperature change reaction, and the linear resistance of the internal resistance is very good, if the connection is more The polar body (22), the more sensitive the temperature change can be detected, the equivalent resistance of the temperature detecting circuit (2) is represented by R _s .

Furthermore, in order to reduce the influence of the change of the ambient temperature, the electrical connection manner of the thermistor (21) and the plurality of diodes (22) is further divided into series or parallel, as shown in the second and third figures. The structure is a schematic diagram of the temperature detecting circuit (2); the connection method of the thermistor (21) and the plurality of diodes (22) is configured according to the environment installed by the water pump (5), The difference is that when the thermistor (21) is connected in series to the diode (22), it is sensitive to changes in temperature, so it is suitable for a temperature-stable environment. If it is used in an environment with a large temperature change. The series connection method will cause the relay (42) of the switch circuit (4) to continuously excite and de-energize, which will make the pump (5) consume considerable power; if the thermistor (21) is connected in parallel to the diode (22) It can be used to detect changes in temperature, so it can be used in environments with large temperature changes. If this parallel connection is used in a temperature-stable environment, the temperature detection circuit (2) may not be instantaneous. Reflecting the overheating of the pump (5), and making the switch circuit (4) The relay (42) is delayed until the switch is turned off. The change relationship is known from the fourth figure. The resistance change value ΔR of the series and parallel is fixed in the figure. It is necessary to check the temperature change of series and parallel to reach ΔR. In series, between the temperature t ₃ and t ₄ , the thermistor (21) has the resistance change value ΔR, and the parallel connection is between the temperatures t ₁ and t ₂ to have the resistance change value ΔR. The temperature range is narrower, while the parallel mode has a wider temperature tolerance range.

In actual use, the temperature detecting circuit (2) may be disposed on the silicon steel frame or motor coil of the motor stator of the water pump (5), in the outer casing of the motor body, in the casing or on the bearing housing or in the casing of the pump body, In the outer side or in the pipeline, the setting method is mainly surface-mounting or embedding. The steel sheet frame and the motor coil are all places where the motor body can be directly detected. The bearing seat is due to long-term operation. The high temperature is generated by the loss. In this way, whether the superheat is detected or not, the pipeline of the pump body is to detect the internal water temperature, or the abnormal temperature rise may cause the watertightness of the pump body to fail, and water leakage or leakage occurs. Gas, so avoiding the temperature overheating of the pump body is also a place to pay attention.

First, the power supply terminal (1) supplies power to the temperature detecting circuit (2), and the thermistor (21) of the temperature detecting circuit (2) and the diode (22) are connected in series or in parallel. In the example, three diodes (22) are taken as an example. The thermistor (21), the diode (22) and the resistor R _x of the temperature detecting circuit (2) form a voltage dividing circuit, and the output voltage thereof is V _o ;

Successively, V _{o is} transmitted to one of the inputs of the comparator (31) of the comparison circuit (3), and the other input of the comparator (31) receives a reference voltage V _REF whose reference voltage V _REF is stabilized The voltage IC and the resistors R1 and R2 are also composed of a voltage dividing circuit and connected with a voltage of 12 V, so V _REF is 12×(R2/R1+R2), and the comparator (31) compares V _{o .} With V _REF , at the normal temperature of the pump (5), V _o will be greater than V _REF , the comparison circuit ( 3 ) will output positive voltage to drive the switching circuit ( 4 ) , and the transistor ( 41 ) of the switching circuit ( 4 ) will act as a relay . (42) The coil side is excited to make the switch side normally closed (NC) state, so that the pump (5) connected to the switch side is turned on, the motor body is started, the impeller is driven, and the water flows through the pump body and is sent to Use where you need it.

When the temperature of the water pump (5) rises, the resistance value of the thermistor (21) of the temperature detecting circuit (2) is lowered, so that the output voltage V _{o is} lowered, and at this time, the V _REF received by the comparator (31) It will be greater than V _o , and the comparison circuit (3) will instantaneously flip and output a negative voltage to stop the operation of the transistor (41) TR, so that no voltage and current pass through the coil side of the relay (42), and the excitation state cannot be maintained. Switch to the Normal Open (NO) state and disconnect the power of the pump (5), indicating that the motor body will not continue to operate to ensure that the pump (5) will not be damaged by overheating.

Among them, the power supply terminal (1) can be selected from constant voltage or constant current type, and the constant voltage type is as shown in the fifth figure, that is, through the voltage regulator IC (11) to provide a constant voltage, the temperature detection circuit in the figure (2) The original equivalent resistance is represented by R _s , and its output voltage V _o is 12 × (R _{s -} ΔR) / R _x + (R _{s -} ΔR); the constant current type is shown in the sixth figure, The diode (12) is connected in parallel with the resistor R _c and the transistor. The original equivalent resistance of the temperature detecting circuit (2) is also represented by R _s , and the current i is the voltage of the second diode (12). V _{ZD is} divided by the resistance R _c , the current i is about 1 to 2 mA, and the output voltage V _{o is} i × (R _{s -} ΔR).

It can be seen from the above description that the present invention has the following advantages compared with the prior art:

1. The temperature detecting circuit of the temperature control protection device of the water pump of the present invention has a thermistor and a diode, which can sensitively detect the temperature change of the pumping device and overheat the pumping machine by the characteristics of the thermistor and the diode. It can be directly detected by the temperature detecting circuit, and the power of the pump is disconnected immediately through the switching circuit, thereby ensuring that the pump is not damaged by overheating.

2. The thermistor and the diode of the temperature control protection device of the pump of the present invention can be electrically connected in series or in parallel, which is configured according to the requirements of the environment, and can be connected in parallel in the environment with large temperature change. The environment with small environment can be connected in series, so that the external environment factor directly affects the pump, it will not affect the temperature detection circuit, and can accurately determine whether the overheating state is the pump itself.

3. The temperature control protection device of the water pump of the invention determines whether the power is cut off according to the detected temperature, and some pumping opportunities are equipped with a proximity switch, which can be used to detect whether there is water in the pump. Now, the present invention can prevent the pump from being When the proximity switch of the pump body fails to operate normally, the motor is idling without water and causing overheating and burning. The invention can immediately stop the power failure when detecting that the temperature of the pump body is too high.

In summary, the temperature control and protection device of the water pump of the present invention can achieve the intended use efficiency by the above disclosed embodiments, and the present invention has not been disclosed before the application, and has completely complied with the patent law. Regulations and requirements.爰Issuing an application for a patent for invention in accordance with the law, and asking for a review, and granting a patent, is truly sensible.

The illustrations and descriptions of the present invention are merely preferred embodiments of the present invention, and are not intended to limit the scope of the present invention; those skilled in the art, which are characterized by the scope of the present invention, Equivalent variations or modifications are considered to be within the scope of the design of the invention.

(1)‧‧‧Power supply end
(11) ‧‧‧Regulator IC

(12) ‧‧ ‧ 二 二 二
(2) ‧ ‧ temperature detection circuit

(21)‧‧‧Thermistors
(22) ‧‧‧Dipole

(3) ‧‧‧Comparative circuit
(31)‧‧‧ Comparator

(4)‧‧‧Switch circuit
(41)‧‧‧Optoelectronics

(42)‧‧‧Relay
(5)‧‧‧Water pump

First Figure: A circuit diagram of the overall architecture of a preferred embodiment of the present invention.

Second: A schematic diagram of a series circuit of temperature detecting circuits in accordance with a preferred embodiment of the present invention.

Third: A schematic diagram of a parallel circuit of a temperature detecting circuit in accordance with a preferred embodiment of the present invention.

Figure 4 is a graph showing the resistance-temperature relationship of the temperature detecting circuit of the preferred embodiment of the present invention.

Figure 5 is a circuit diagram of a constant voltage power supply terminal of a preferred embodiment of the present invention.

Figure 6 is a circuit diagram of a constant current power supply terminal of a preferred embodiment of the present invention.

Claims (8)

A temperature control protection device for a water pump, comprising: a power supply end; a temperature detecting circuit electrically connected to the power supply end, the temperature detecting circuit comprising a thermistor and a plurality of series or parallel connected to each other a comparator circuit electrically connected to the temperature detecting circuit, wherein the comparing circuit compares a reference voltage and an output voltage of the temperature detecting circuit with a comparator; and a switching circuit whose input end is electrically The output of the comparison circuit is connected, and the output end is electrically connected to a water pump. The temperature control protection device of the water pump according to claim 1, wherein the switch circuit is a transistor and a relay electrically connected to the transistor. The temperature control protection device of the water pump of claim 1, wherein the water pump comprises a motor body and a pump body. The temperature control protection device of the water pump according to claim 3, wherein the motor body comprises a bearing seat, a motor stator and an impeller. The temperature control and protection device for a water pump according to claim 4, wherein the motor stator houses a motor coil in a steel sheet frame. The temperature control protection device of the water pump according to claim 1, wherein the reference voltage is output by a voltage dividing circuit. The temperature control protection device of the water pump according to claim 1, wherein the power supply terminal is powered by a constant voltage type (CONSTANT VOLTAGE) or a constant current type (CONSTANT CURRENT). The temperature control circuit of the water pump of claim 1, wherein the temperature detecting circuit further has a resistor connected in series with the thermistor and the plurality of diodes.