CN2913945Y - Electroshock preventing device for electric water heater - Google Patents

Abstract

Electric water heater anti-shock device. According to the design scheme provided by the utility model, there are at least two passages in the forming pipe, one of which is the water inlet passage and the other is the water outlet passage, the upper end of the water inlet passage is connected with the water inlet, and the lower end of the water inlet passage is connected with the water outlet passage. The lower end of the water outlet channel communicates with the water outlet provided at the upper end of the forming tube. The utility model can simplify the structure and improve the effect of preventing electric shock.

Description

Electric water heater anti-shock device

technical field

The utility model belongs to an electric shock prevention device, in particular to an electric shock prevention device suitable for being installed in an electric water heater.

Background technique

National GB13955-2005 "Installation and Operation of Residual Current Action Protection Devices" stipulates in 5.8.3: "The electrical equipment installed in specific areas such as swimming pools, water feature fountains, water amusement parks, bathrooms, etc. should use a rated residual operating current of 10mA", When the water heater leaks electricity for some reason, this current in a safe state can ensure personal safety. For this reason, a kind of anti-shock device must be installed at the water inlet and outlet places of these electrical equipment. In the prior art, the structure of the anti-shock device used is relatively complicated, and the anti-shock effect is unstable, which often affects the normal use of this type of electrical equipment.

Contents of the invention

The purpose of the utility model is to design an electric water heater anti-shock device to simplify the structure and improve the anti-shock effect.

According to the design scheme provided by the utility model, there are at least two passages in the forming pipe, one of which is the water inlet passage and the other is the water outlet passage, the upper end of the water inlet passage is connected with the water inlet, and the lower end of the water inlet passage is connected with the water outlet passage. The lower end of the water outlet channel communicates with the water outlet provided at the upper end of the forming tube.

A straight pipe is connected to the upper end of the forming pipe, and there is a plug at the lower end of the forming pipe. The water inlet channel communicates with the cavity formed in the straight pipe. The wire insert has a pre-embedded inner wire insert at the lower end of the connector, and a sealing ring is arranged between the inner wire insert and the straight pipe. There are two water inlet passages and two water outlet passages respectively.

In the forming tube, upper and lower ends of the water inlet channel and the water outlet channel are respectively provided with an upper chamber and a lower chamber, wherein the upper chamber communicates with the water inlet channel, and the lower chamber communicates with the water inlet channel and the water outlet channel. The water outlet is inclined. There are two forming pipes, and the two ends of the two forming pipes are respectively connected to each other by pipes, and two connecting pieces are respectively installed on each forming pipe.

Compared with the prior art, the invention has the following advantages: compact and reasonable structure, easy and convenient installation, greatly improved safety, greatly reduced manufacturing cost, and both safety, economy and rationality. On the premise of ensuring the water flow, the design principle of reducing the pipe diameter and increasing the number of water passages ensures the safety requirements, and its length is shortened, which is more economical and reasonable.

Description of drawings

Fig. 1 is a structural diagram of the utility model.

Fig. 2 is a B-B view of Fig. 1 .

Fig. 3 is the A-A view of Fig. 1 .

Fig. 4 Another form of the utility model.

Fig. 5 is another form of the utility model.

Detailed ways

As shown in Figures 1, 2, and 3: a straight pipe 5 is connected to the upper end of the forming pipe 6, a plug 7 is provided at the lower end of the forming pipe 6, and there are 4 channels in the forming pipe 6, two of which are water inlet channels 9 . Connected, the upper end of this water outlet channel 14,15 communicates with the water outlet 13 that is arranged on the forming pipe 6 upper ends. Connector 2 is installed on the upper end of straight pipe 5, there is embedded outer wire insert 1 at the upper end of connector 2, and there is embedded inner wire insert 4 at the lower end of connector 2, and inner wire insert 4 and A sealing ring 3 is arranged between the straight pipes 5 .

In the forming tube 6, the upper and lower ends of the water inlet passages 9, 10 and the water outlet passages 14, 15 are respectively provided with an upper chamber 11 and a lower chamber 8, wherein the upper chamber 11 communicates with the water inlet passages 9, 10, and the lower chamber 8 communicates with the inlet water passages. The lower ends of the water channels 9, 10 and the water outlet channels 14, 15 communicate. The water outlet 13 is inclined.

The difference between the structure shown in Figure 4 and the structure shown in Figure 1 is that there is only one water inlet channel and two water outlet channels, and the rest of the structure is the same as in Figure 1 .

Fig. 5 is another form of the utility model, and this figure provides a set of anti-shock device matched with the electric water heater, and it is made up of two parts of water inlet system and water outlet system. The water inlet system consists of an anti-leakage joint insert 19, a sealing ring 18, a PP-R connecting pipe 17, a PP-R elbow 16, a PP-R forming pipe 6, and an anti-leakage outer wire insert 20. It is connected to the water inlet and outlet pipe thread of the electric water heater, and the water inlet and outlet assembly is placed outside the electric water heater, and its structural form adopts an O shape. The two parts of the water inlet system and the water outlet system are integrated through the advanced injection molding process, so that compared with the prior art, the installation is convenient, the structure is firm, the maintenance is convenient, the appearance is clean and beautiful, and it is practical. The electric shock prevention device is particularly suitable for being installed outside the electric water heater. Among them, the anti-leakage outer wire insert 20 on the right is used to connect with the water inlet pipe network; the leakage outer wire insert 20' on the left is used to connect with the user's hot water pipe network; The anti-leakage joint insert 19' is connected with the outlet pipe of the electric water heater; the anti-leakage joint insert 19 on the right is connected with the water inlet pipe of the electric water heater; the sealing ring 18 is used for sealing to prevent leakage; the elbow 16 And the PP-R connecting pipe 17 connects the two forming pipes 6 together, so that the system forms a closed-loop passage.

The utility model provides a set of anti-shock device matching with the electric water heater, which is composed of two parts: a water inlet assembly and a water outlet assembly. The water inlet assembly consists of anti-leakage outer wire insert 1, connector 2, sealing ring 3, anti-leakage inner wire insert 4, PP-R straight pipe 5, PP-R shaped pipe 6, PP-R plug 7 . The water outlet component consists of an anti-leakage outer wire insert, a connector, a sealing ring, an anti-leakage inner wire insert, and a PP-R horn tube. When installing, connect the product of the utility model to the thread of the water inlet and outlet pipe of the electric water heater, place the water inlet and outlet assembly in the inner tank of the electric water heater, and its structural form adopts an inverted mountain shape; or a porous straight pipe shape; Without reducing the flow of water, the pipe diameter is reduced to meet the safety requirements of electric shock prevention and save material costs.

The composition and function of the device are shown in the figure: in the water inlet assembly, the anti-leakage outer wire insert 1 is used to connect with the water inlet pipe network; The insert 4 is connected as a whole; the sealing ring 3 is used for sealing to prevent leakage; the anti-leakage inner wire insert 4 is connected with the water inlet pipe of the water heater; the PP-R straight pipe 5 and the PP-R shaped pipe 6 are used as water The process pipeline; the PP-R plug 7 is welded on the PP-R formed pipe 6 by hot melting. The composition and function of the water outlet component: the anti-leakage outer wire insert is used to connect with the user's hot water pipe network; , To prevent leakage, the anti-leakage inner wire insert is connected to the outlet pipe of the water heater, and the PP-R horn pipe is a hot water flow pipe.

According to national regulations: the rated residual operating current of electrical equipment in some specific areas should be 10mA. When leakage occurs in the water heater for some reason, the resistance in the water R = 220V/10*10 ^-3 A = 22*10 ³ Ω, After a lot of tests, we have shown that when the temperature of the water in the water heater is 50°C, the resistivity ρ of the water is 7700Ω.mm; if the length of the PP-R tube is L (mm), the inner diameter of the PP-R tube is d, The resistance of the water is R, and the resistivity of water is ρ, then:

L＝R.πd ² /4ρ＝22*10 ³ *3.14d ² /4*7700＝2.2d ²

It can be seen from the above formula that as long as we ensure that the flow of water in the PP-R pipe is greater than or equal to 2.2d ² , we can ensure the safety of users. We are designing based on the above design ideas.

Utilizing the characteristics of PP-R homogeneous hot-melt, the whole device is integrated without leakage, which further ensures the safety of users.

This device uses advanced injection molding technology to completely isolate water from metal conductors throughout the process, which further ensures the safety of use.

Through a large number of simulation tests on various physical characteristics of electric water heaters in use, it is concluded that when the temperature of water in the electric water heater is 50°C, the resistivity ρ of the water is 7700Ω.mm; The resistivity is much smaller than 13000Ω.mm. As long as we ensure that the flow of water in the PP-R pipe is greater than or equal to 2.2d ² , it will be safer and more reliable than the existing technology, ensuring the safety of users.

Claims (6)

1. The electric water heater anti-shock device is characterized in that there are at least two channels in the forming tube (6), one of which is the water inlet channel and the other is the water outlet channel, the upper end of the water inlet channel is connected with the water inlet, and the water inlet The lower end of the channel communicates with the lower end of the water outlet channel, and the upper end of the water outlet channel communicates with the water outlet (13) arranged at the upper end of the forming tube. 2. The electric water heater anti-shock device according to claim 1, characterized in that: the upper end of the forming pipe (6) is connected with a straight pipe (5), and there is a plug (7) at the lower end of the forming pipe (6), The water passage communicates with the cavity (12) formed in the straight pipe (5), and a connector (2) is installed on the upper end of the straight pipe (5), and there is a pre-embedded outer wire insert at the upper end of the connector (2) (1), there is a pre-embedded inner wire insert (4) at the lower end of the connector (2), and a sealing ring (3) is arranged between the inner wire insert (4) and the straight pipe (5). 3. The electric water heater anti-shock device according to claim 1, characterized in that: there are two water inlet channels and two water outlet channels respectively. 4. The electric water heater anti-shock device according to claim 1, characterized in that: an upper cavity (11) and a lower cavity (8) are respectively arranged in the forming tube (6), at the upper and lower ends of the water inlet channel and the water outlet channel , wherein the upper chamber (11) communicates with the water inlet channel, and the lower chamber (8) communicates with the water inlet channel and the water outlet channel. 5. The electric water heater anti-shock device according to claim 1, characterized in that: the water outlet (13) is inclined. 6. The electric water heater anti-shock device according to claim 1, characterized in that: there are two forming tubes (6), and the two ends of the two forming tubes (6) are connected to each other by pipes, and each forming tube (6) install two connectors respectively.

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