CN208075302U - Electric water heater - Google Patents

Abstract

The utility model belongs to the technical field of water heaters, and discloses an electric water heater. A water pipe screw head is provided at a water inlet and/or a water outlet. The water pipe screw head includes an insulating body, and the insulating body is provided with a protective resistor. One end of the protection resistor is grounded, and the other end is connected to the inner tank of the electric water heater and/or the electric heater and/or the water body in the electric water heater. When the electric water heater itself leaks electricity, the leakage voltage can be reduced below the safe voltage through the protection resistor, so that the voltage exported to the ground electrode drops below the safe voltage, and the impact on the surrounding electrical appliances connected to the ground electrode at the same time is weakened. When the leakage of other surrounding electrical appliances is conducted to the protection resistor of the electric water heater, the protection resistor can reduce the voltage transmitted to the electric water heater to below the safe voltage, effectively protecting the electric water heater from the influence of other electrical leakage, and thus ensuring the safety of the user. Personal safety.

Description

an electric water heater

technical field

The utility model relates to the technical field of water heaters, in particular to an electric water heater.

Background technique

At present, with the improvement of people's living standards, water heaters have entered thousands of households. As a special electrical product, water heaters have particularly important safety features. Once the water heater leaks, it will directly endanger people's lives. The electric water heater is a household appliance. In order to ensure the personal safety of the user, the electric water heater needs to be grounded for leakage protection. The electric water heater includes an inner tank, an insulating layer wrapped around the inner tank, and an outer shell wrapped around the insulating layer; an electric heater for heating is also included.

Because the water pipes of existing water heaters usually adopt plastic pipe fittings and the insulation layer is an insulating layer, even if the water in the electric water heater is charged, it can ensure that the water pipes and the shell are not charged. In the prior art, the electric water heater realizes the leakage protection of the outlet water through the anti-electric wall structure. Specifically, a water resistance with a large resistance value is formed through a certain length of isolated water column, and the leakage voltage is reduced below the safe voltage by using the principle of resistive voltage division.

The structures that require leakage protection on the electric water heater also include an inner tank and an electric heater. In the prior art, the inner tank and the electric heater are grounded to realize leakage protection.

At present, the grounding wires of various household appliances in the user’s residence are connected to each other. When the electric water heater has a leakage problem, once the grounding end is not truly grounded and a virtual connection is formed, other household appliances will be charged through the grounding wire, affecting the use of the user, and even endanger the personal safety of users.

Utility model content

The purpose of this utility model is to provide an electric water heater. When the electric water heater leaks electricity, the voltage derived from the electric water heater to the ground electrode can be reduced to below the safe voltage through the protection resistor, and the influence on the surrounding electrical appliances connected to the ground electrode at the same time can be weakened. , to ensure the personal safety of users.

For this purpose, the utility model adopts the following technical solutions:

An electric water heater, a water pipe screw head is provided at the water inlet and/or water outlet, the water pipe screw head includes an insulating body, a protective resistor is provided on the insulating body, one end of the protective resistor is grounded, and the other end is connected to the The liner of the electric water heater and/or the electric heater and/or the water body in the electric water heater.

Preferably, one end of the protection resistor is connected to a metal connection terminal, and the metal connection terminal is grounded.

Preferably, the insulating body is connected with an insulating water pipe communicating with it, the other end of the protection resistor is connected to the water flow in the insulating body, the insulating water pipe extends into the inner tank and the top of the insulating water pipe The isolated water column between the bottom and the bottom can reduce the conducted voltage to below the safe voltage.

Preferably, the isolated water column between the end of the protection resistor connected to the water flow and the end of the insulating body not connected to the insulated water pipe can reduce the conducted voltage to below a safe voltage.

Preferably, a metal insert is provided at one end of the insulating body close to the water inlet or the water outlet, the metal insert is connected to the inner tank of the electric water heater, and one end of the protection resistor is connected to the metal inserts.

Preferably, the insulating body is composed of an insulating tube body, and the protection resistor is integrally formed in the insulating tube body.

Preferably, the electric water heater includes an insulation layer wrapping the inner tank, and the protection resistor and the metal connection terminals are both placed in the insulation layer.

Preferably, the resistance value of the protection resistor is 100KΩ-150KΩ.

Beneficial effects of the utility model: when the electric water heater itself leaks electricity, the leakage voltage can be reduced below the safe voltage through the protection resistor, so that the voltage exported to the grounding electrode is lowered below the safe voltage, and the impact on the surrounding electrical appliances connected to the grounding electrode at the same time is weakened. Impact. When the leakage of other surrounding electrical appliances is conducted to the protection resistor of the electric water heater, the protection resistor can reduce the voltage transmitted to the electric water heater to below the safe voltage, effectively protecting the electric water heater from the influence of other electrical leakage, and thus ensuring the safety of the user. Personal safety.

Description of drawings

Fig. 1 is the structural representation of electric water heater of the present utility model;

Fig. 2 is a schematic diagram of the installation position of the protection resistor described in the first embodiment of the utility model;

Fig. 3 is a schematic diagram of the installation position of the protection resistor described in the second embodiment of the present invention.

In the picture:

1. Housing; 2. Liner; 3. Electric heater; 4. Water pipe screw head; 5. Protection resistor; 6. Metal terminal; 7. Insulated water pipe; 8. Outer sleeve; 9. Metal insert; 41 , Insulation body.

Detailed ways

The technical scheme of the utility model will be further described below in conjunction with the accompanying drawings and through specific embodiments.

Embodiment one

This embodiment provides an electric water heater. As shown in FIG. 3 and the water pipe screw head 4, an insulation layer (marked in the figure) is laid in the above-mentioned housing 1, and the above-mentioned liner 2 and the electric heater 3 are all arranged in the insulation layer. Through the above-mentioned insulation layer, the electric heater can be guaranteed The housing 1 of 3 will not be charged.

Specifically, the above-mentioned water pipe screw head 4 of this embodiment is arranged at the water inlet and/or water outlet. Referring to FIG. A protection resistor 5, one end of the protection resistor 5 is grounded, and the other end is connected to the inner tank 2 of the electric water heater and/or the electric heater 3 and/or the water body in the electric water heater.

Further, one end of the protective resistor 5 in this embodiment is connected to a metal connection terminal 6 and grounded through the metal connection terminal 6 . When the electric water heater itself leaks electricity, the leakage voltage can be reduced below the safe voltage through the above-mentioned protection resistor 5, so that the voltage derived from the metal terminal 6 to the grounding electrode drops below the safe voltage, and the impact on the surrounding electrical appliances connected to the grounding electrode at the same time is weakened. influences.

Moreover, through the above-mentioned protection resistor 5 in this embodiment, when other surrounding electrical appliances leak and conduct the leakage voltage to the metal terminal 6 of the electric water heater, due to the effect of the protection resistor 5, the leakage voltage conducted to the electric water heater can be reduced to a safe level. Below the voltage, the electric water heater is effectively protected from the leakage of other electrical appliances, thereby ensuring the personal safety of users.

In this embodiment, the above-mentioned protective resistor 5 and the metal terminal 6 are placed in the insulation layer, thereby preventing the electric water heater from being electrified by the leakage voltage when the electric water heater leaks, thereby preventing the user from being threatened by safety.

Specifically, please refer to Fig. 2, the above-mentioned water pipe screw head 4 of this embodiment is connected with an insulating water pipe 7 extending into the inner tank 2, the insulating water pipe 7 is connected to the insulating body 41, and the top of the insulating water pipe 7 is connected to the bottom. The isolated water column between them will form a large resistance. Using the principle of resistance voltage division, the voltage conducted by the water body in the electric water heater can be reduced to below the safe voltage. When the water body in the inner tank 2 is charged, the voltage can be reduced to Below the safe voltage, it also ensures that the outlet water voltage of the electric water heater is below the safe voltage, ensuring the safety of water for users. Further, in this embodiment, an outer sleeve 8 is sheathed on the top of the above-mentioned insulating water pipe 7, and a passage for water supply and circulation is formed between the outer sleeve 8 and the insulating water pipe 7, and the passage communicates with the insulating water pipe 7, further increasing the The length of the isolation water injection mentioned above.

In this embodiment, further, the isolated water column between the end of the protective resistor 5 connected to the water flow and the end of the insulating body 41 not connected to the insulating water pipe 7 can reduce the voltage conducted by the water body to below the safe voltage. Through the arrangement of this structure, it can further ensure that the outlet water voltage of the electric water heater is below the safe voltage.

In this embodiment, the above-mentioned insulating body 41 is composed of an insulating tube body, and the above-mentioned protective resistor 5 is integrally formed in the insulating tube body, and one end of the protective resistor 5 is connected to the water flow in the insulating body 41, and the other end of the protective resistor 5 is The metal connection terminal 6 is connected, and the end of the metal connection terminal 6 not connected to the protection resistor 5 is placed outside the water flow channel. Through this structure, when the electric heater 3 or the liner 2 leaks, the leakage voltage of the electric heater 3 and the liner 2 can be conducted to the insulating tube body through the water body in the liner 2, and the isolated water column in the insulating tube body When the voltage is lowered below the safe voltage, the voltage at the protective resistor 5 is pulled down to achieve good protection for the grounding electrode, which also reduces the impact of the simultaneous connection of the grounding electrode due to the leakage of the electric heater 3 and the inner tank 2. The influence of surrounding electrical appliances.

It should be pointed out that in this embodiment, the above-mentioned liner 2 and the electric heater 3 can also be directly connected to the above-mentioned protective resistor 5 through the terminal, specifically connected to the end of the protective resistor 5 that is connected to the water flow. When the heater 3 and the inner tank 2 leak electricity, the leakage voltage can be directly reduced to below the safe voltage through the protection resistor 5, and the grounding electrode can also be well protected, weakening the leakage caused by the electric heater 3 and the inner tank 2. The influence caused by the surrounding electrical appliances connected to the ground electrode.

It can be understood that the above-mentioned electric water heater in this embodiment can reduce the leakage voltage of the electric heater 3, the inner tank 2 and the water body below the safe voltage when the electric heater 3, the liner 2, and the water body leak electricity, so as to protect the surrounding electrical appliances, and can also conduct the electrical leakage of the surrounding electrical appliances. The leakage voltage to the electric water heater drops below the safe voltage. Specifically, when the surrounding electrical appliances leak, the leakage voltage can be lowered by the protection resistor 5, thereby ensuring the safety of the electric water heater.

In this embodiment, the resistance value of the protective resistor 5 is 100KΩ-150KΩ, so as to ensure that when the leakage voltage passes through the protective resistor 5, the protective resistor 5 can reduce the leakage voltage below the safe voltage.

Embodiment two

The difference between this embodiment and Embodiment 1 is that the setting position of the protective resistor 5 of this embodiment is different. Specifically, refer to FIG. 9, the metal insert 9 is connected to the inner tank 2 of the electric water heater, and one end of the protective resistor 5 is connected to the metal insert 9. When the inner tank 2 leaks, the leakage voltage can be transmitted to the protective resistor 5 through the metal insert 9 , the voltage is lowered to below the safe voltage by the protection resistor 5. And when the electric heater 3 leaks, it can be conducted to the inner tank 2 through the water body in the inner tank 2, and finally conducted to the protection resistor 5 through the metal insert 9, and the voltage is lowered by the protection resistor 5.

It can be understood that the above-mentioned electric heater 3 in this embodiment can also be directly connected to the above-mentioned protective resistor 5 through a connection terminal, specifically connected to the end where the protective resistor 5 is connected to the metal insert 9. At this time, when the electric heater 3 In case of leakage, the leakage voltage can be directly reduced to below the safe voltage through the protection resistor 5 .

Other structures of the electric water heater of this embodiment are the same as those of the electric water heater of Embodiment 1, and will not be repeated here.

Apparently, the above-mentioned embodiments of the present utility model are only examples for clearly illustrating the present utility model, rather than limiting the implementation manner of the present utility model. For those of ordinary skill in the art, on the basis of the above description, other changes or changes in different forms can also be made. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the utility model shall be included in the protection scope of the claims of the utility model.

Claims (8)

1. a kind of electric heater, which is characterized in that be equipped with water pipe screw head, the water pipe screw head in water inlet and/or water outlet Including insulating body, the insulating body is equipped with protective resistance, protective resistance one end ground connection, and the other end connects the electricity The liner and/or electric heater and/or the water body in the electric heater of water heater.

2. electric heater according to claim 1, which is characterized in that one end of the protective resistance is connected with metal connection Terminal, the metal wiring terminal ground connection setting.

3. electric heater according to claim 1, which is characterized in that the insulating body is connected with the insulation communicated therewith Water pipe, the other end of the protective resistance stretch into the liner with the water conduction in the insulating body, the insulation water pipe It is arranged and the voltage of conduction can be down to safe voltage or less by the insulation water pipe top to the isolation water column between bottom end.

4. electric heater according to claim 3, which is characterized in that one end and institute of the protective resistance and water conduction Safe voltage can be down to by the voltage of conduction by stating the isolation water column that insulating body is not connected between one end of the insulation water pipe Below.

5. electric heater according to claim 1, which is characterized in that the insulating body is close to the water inlet or described Water outlet one end is equipped with metal insert, and the metal insert is connected to the liner of the electric heater, and the one of the protective resistance End is connected to the metal insert.

6. according to any electric heaters of claim 2-5, which is characterized in that the insulating body is by insulation tube body structure At the protective resistance is shaped in the insulation tube body.

7. electric heater according to claim 2, which is characterized in that the electric heater includes the heat preservation for wrapping up liner Layer, the protective resistance and the metal wiring terminal are placed in the insulating layer.

8. electric heater according to claim 1, which is characterized in that the resistance value of the protective resistance is 100K Ω- 150KΩ。