CN215675845U - Water resistance type electric shock prevention device and electric water heater - Google Patents

Abstract

The utility model discloses a water resistance type electric shock prevention device and an electric water heater, comprising: the core tube is arranged in the outer tube body and is communicated with one end of the outer tube body, so that an inner cavity of the core tube forms a first flow channel; the inner sleeve is embedded from the other end of the outer tube body and sleeved on the core tube through the second inner cavity, the second inner cavity forms a second flow channel, and the first inner cavity forms a third flow channel; the first flow channel, the second flow channel and the third flow channel are communicated in a roundabout way; the core pipe is eccentrically arranged in the outer pipe body, the second inner cavity is sleeved on the core pipe and then is divided into a left part and a right part by the core pipe, and the first flow passage, the second flow passage and the third flow passage are all in a single cylinder shape. The utility model has the characteristics of small volume, large flow and low cost.

Description

Water resistance type electric shock prevention device and electric water heater

Technical Field

The utility model relates to the technical field of electric water heaters, in particular to a water resistance type electric shock prevention device and an electric water heater.

Background

In an electric water heater, in order to ensure the safety of water use, a water resistance structure is usually arranged on a water inlet pipe and a water outlet pipe of the electric water heater. At present, the water resistance structure of the water inlet and outlet pipe of the existing electric water heater on the market can be roughly divided into two types: one is a pipeline with the functions of insulating and reducing water resistance, such as a built-in insulating pipe structure. The other is a pipeline without an insulation effect, such as a common stainless steel pipe, but the product is generally externally connected with a device with the functions of insulation and water resistance reduction, and an external electricity-proof wall is commonly used; compared with an internal insulation tube structure, the external electricity-proof wall has better reliability because the external electricity-proof wall is not in a hot water environment; however, the external devices have more types and complex structures, and most of the external devices have water leakage and potential safety hazards.

At present, the technology of the built-in insulating tube is widely adopted by electric water heaters due to low cost, no occupation of external installation space, small flow influence, and better manufacturability and reliability. As the internal insulation tube technology is laid out by other enterprises, high special fees need to be paid, and a plurality of external electricity-proof wall structures with the same cost advantage are developed in the industry.

The utility model discloses a chinese utility model patent that publication number is CN 212390631U discloses an electricity-proof wall structure that electric water heater used, including outer tube, inner tube and core pipe, the both ends of outer tube are equipped with first mouth of pipe and second mouth of pipe respectively, locate in the outer tube in the core pipe is coaxial and the one end and the first mouth of pipe of core pipe are linked together, the inner tube from the second mouth of pipe embedded in the outer tube and overcoat in core pipe, be equipped with flowing water cavity, tye and outlet pipe mouth on the inner tube, flowing water cavity keeps away from the other end of first mouth of pipe with the core pipe and is linked together, flowing water cavity is linked together through tye and outlet pipe mouth, the tye encircles on the outer wall of inner tube. The utility model discloses an although can be through the purpose that the extension water course and then increase water resistance, the tye encircles and constitutes annular flow channel between the outer wall of locating the inner tube, inner tube and the core pipe for rivers are dispersion, whole prevent that electric wall structure blocks up easily, space utilization is not well controlled, manufacturability is also relatively poor. When in use, the filter screen is often combined for use. In addition, the water flow dispersing structure can cause the water resistance to be larger, and further cause the water flow to be smaller, generally about 5.5L/min. This amount of water flow can result in a reduction in the hot water output of the liner.

As another prior application by the present applicant, a chinese utility model patent with publication No. CN209744738U discloses a water resistance type electric shock prevention device, which is characterized by comprising: the outer pipe body and the valve core are insulating pieces; the valve core comprises two end pieces and at least three spacers positioned between the two end pieces, two ends of each spacer are respectively connected with the two end pieces, a water flow channel is formed by connecting the two spacers and the inner wall of the outer tube body in a surrounding manner, the water flow channels are sequentially communicated end to form a circuitous water channel, and a water inlet and a water outlet which are connected with the circuitous water channel are respectively arranged on the two end pieces. Although the water flow channel has a large span and is not easy to be blocked, the sealing performance of the valve core and the outer pipe body is difficult to ensure, and water resistance failure is easy to cause; in addition, due to the structural design of the three spacers, the manufacturability is poor, and each spacer is required to have a thicker thickness (the flow channel space is limited), so that the strength of the three spacers can be ensured, and the deformation caused by cold and hot impact is avoided; therefore, the cost of popularization and application is higher.

Disclosure of Invention

Aiming at the problems in the prior art, the utility model aims to provide the water resistance type electric shock prevention device which is small in size, low in application cost and good in manufacturability.

The utility model also provides an electric water heater with the water resistance type electric shock prevention device.

In order to achieve the purpose, the utility model adopts the following technical scheme.

A water-resistance type electric shock preventing device comprising: the core tube is arranged in the outer tube body and is communicated with one end of the outer tube body, so that an inner cavity of the core tube forms a first flow channel; the inner sleeve is embedded from the other end of the outer tube body and sleeved on the core tube through the second inner cavity, the second inner cavity forms a second flow channel, and the first inner cavity forms a third flow channel; the first flow channel, the second flow channel and the third flow channel are communicated in a roundabout way; the core pipe is eccentrically arranged in the outer pipe body, the second inner cavity is sleeved on the core pipe and then is divided into a left part and a right part by the core pipe, and the first flow passage, the second flow passage and the third flow passage are all in a single cylinder shape.

More preferably, the cross-sectional area of the second lumen is two or more times the cross-sectional area of the first lumen.

More preferably, the difference between the cross-sectional areas of the first flow passage, the second flow passage and the third flow passage is less than or equal to 20mm in comparison with each other²。

More preferably, the cross-sectional areas of the first flow passage, the second flow passage, and the third flow passage are the same.

More preferably, the outer tube body, the inner sleeve and the core tube are all hydrophilic insulating pieces, and the hydrophilic insulating pieces are PPR pieces, PA pieces or PP pieces.

More preferably, an external thread insert and an internal thread insert are respectively arranged at two ends of the outer tube body, and a sealing ring is arranged in the internal thread insert; the external thread insert and the internal thread insert are both metal pieces.

More preferably, a filter screen is arranged at an inlet of the first flow channel, and a water through hole is formed in the pipe wall of the core pipe and used for communicating the first flow channel with the second flow channel; and the inner sleeve is sleeved on the core pipe, and the lower edge of the inner sleeve is higher than the bottom of the core pipe and is used for communicating the second flow channel with the third flow channel.

More preferably, a positioning structure for preventing the inner sleeve from rotating is arranged between the outer pipe body and the inner sleeve; the positioning structure includes: a male/female structure disposed on the outer body, and a female/male structure disposed on the inner cannula that mates with the male/female structure.

More preferably, the inner sleeve is provided with a boss which is matched with an inlet pipe or an outlet pipe of the electric water heater, and the boss is of a hollow structure and is communicated with the third flow channel.

An electric water heater is characterized in that the water resistance type electric shock prevention device is arranged on the water inlet and/or the water outlet of the electric water heater.

The utility model has the beneficial effects.

First, because first runner, second runner and third runner are single barrel-shaped structure, its cross-section conveniently sets up to circular or approximate circular, can furthest promote space utilization, increase rivers passageway, promote discharge, also be difficult for causing the jam. Experiments prove that under the condition of adopting the same outer tube body structure, the water flow of the traditional annular scheme can be increased to about 5L/min to about 9L/min; the problem of the reduction of the hot water output rate of the inner container caused by the reduction of the water flow is completely avoided. Meanwhile, as only a single flow channel is formed on the outer wall of the inner sleeve, structures such as an additional positioning block arranged at the bottom of the inner sleeve and an additional connecting hole arranged at the top of the inner sleeve are not needed; therefore, the injection molding of the inner sleeve is simpler, the manufacturability is good, and the manufacturing cost is low; and further achieves or even is superior to the built-in electricity-proof wall structure in the aspects of volume, flow, manufacturability, cost, reliability and the like, and has great popularization and application values.

Second, through set up location structure between outer body and inner tube cover, prevent effectively that outer body and interior sleeve pipe from taking place to rotate in the axial, and then avoid rotating the effective usable floor area of second runner cross-section that leads to because of the accident and change, also avoid discharge and leakage current to change better.

And the combined design of the external thread insert and the internal thread insert is convenient for realizing the connection of the water resistance type electric shock prevention device with the water heater joint and the external pipeline, and the water resistance type electric shock prevention device is good in universality and convenient to install and use. In addition, the arrangement of the internal thread insert is convenient for the installation and fixation of the sealing ring.

Drawings

Fig. 1 is a schematic structural view of a water-resistance electric shock preventing device provided by the present invention.

Fig. 2 is an exploded view of the water-resistance electric shock preventing apparatus according to the present invention.

Fig. 3 is a sectional view of the water-resistance type electric shock preventing apparatus according to the present invention.

Fig. 4 is a schematic water flow diagram of the water resistance type electric shock preventing apparatus according to the present invention 1.

Fig. 5 is a schematic structural diagram of an electric water heater provided by the present invention.

Fig. 6 is a schematic view showing an assembly structure of the water inlet pipe and the water-resistance electric shock preventing device.

Fig. 7 is a schematic view of an assembly structure of the water outlet pipe and the water-resistance electric shock preventing device.

Reference numerals indicate the same.

1: outer tube, 2: inner sleeve, 3: core tube, 4: first flow passage, 5: second flow passage, 6: third flow passage, 7: male threaded insert, 8: internal thread insert, 9: electric water heater, 10: seal ring, 11: inlet tube, 12: water outlet pipe, 13: water resistance type electric shock preventing device, 14: positioning structure, 15: and (4) a filter screen.

Detailed Description

In the description of the present invention, it should be noted that, for the terms of orientation, such as "central", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., it indicates that the orientation and positional relationship shown in the drawings are based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated without limiting the specific scope of protection of the present invention.

Furthermore, if the terms "first" and "second" are used for descriptive purposes only, they are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. Thus, a definition of "a first" or "a second" feature may explicitly or implicitly include one or more of the feature, and in the description of the utility model, "at least" means one or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "assembled", "connected", and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; or may be a mechanical connection; the two elements can be directly connected or connected through an intermediate medium, and the two elements can be communicated with each other. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.

In the present application, unless otherwise specified or limited, "above" or "below" a first feature may include the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other through another feature therebetween. Also, the first feature being "above," "below," and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply an elevation which indicates a level of the first feature being higher than an elevation of the second feature. The first feature being "above", "below" and "beneath" the second feature includes the first feature being directly below or obliquely below the second feature, or merely means that the first feature is at a lower level than the second feature.

The following describes the embodiments of the present invention with reference to the drawings of the specification, so that the technical solutions and the advantages thereof are more clear and clear. The embodiments described below are exemplary and are intended to be illustrative of the utility model, but are not to be construed as limiting the utility model.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

As shown in fig. 1 to 3, a water resistance type electric shock preventing apparatus includes: the outer pipe body 1, the inner sleeve 2 and the core pipe 3, the core pipe 3 is arranged in the outer pipe body 1 and communicated with one end of the outer pipe body 1, so that the inner cavity of the core pipe 3 forms a first flow channel 4; the inner sleeve 2 comprises a first inner cavity and a second inner cavity, the sectional area of the second inner cavity is larger than that of the first inner cavity, the inner sleeve 2 is embedded from the other end of the outer tube body 1 and sleeved on the core tube 3 through the second inner cavity, the second inner cavity forms a second flow channel 5, and the first inner cavity forms a third flow channel 6; the first flow channel 4, the second flow channel 5 and the third flow channel 6 are in circuitous communication.

The core tube 3 is eccentrically arranged in the outer tube body 1, and the second inner cavity is sleeved on the core tube 3 and then is divided into a left part and a right part by the core tube 3. Therefore, the first flow channel 4, the second flow channel 5 and the third flow channel 6 are all in a single cylinder shape, the cross sections of the first flow channel, the second flow channel and the third flow channel are conveniently arranged in a circular shape or an approximately circular shape, the space utilization rate can be improved to the maximum extent, the water flow channels are enlarged, the water flow is improved, and the blockage is not easily caused.

In this embodiment, the cross-sectional area of the second inner cavity is preferably two or more times the cross-sectional area of the first inner cavity, and the cross-sectional areas of the first flow channel 4, the second flow channel 5, and the third flow channel 6 are preferably the same; in other embodiments, the cross-sectional areas of the first flow channel 4, the second flow channel 5 and the third flow channel 6 may be similar, and in the similar case, it is preferable that the differences between the cross-sectional areas of the first flow channel, the second flow channel and the third flow channel are less than or equal to 20mm in comparison with each other². Here, the same or similar (in particular identical) cross-sections have the following advantages: 1) under the condition of adopting the same outer tube body structure, the maximum water flow can be ensured; 2) under the same water resistance performance requirement, the height of the outer pipe body can be shortened to be optimal, and the installation space is reduced.

Referring to fig. 4, in actual operation, after flowing in from the water inlet, the water flows through the first flow channel 4, the second flow channel, and the third flow channel 6 in sequence, and then flows out from the water outlet. So set up, can be with original water resistance length extension for original triple, reduce leakage current to a great extent, reduce the human injury.

Experiments prove that under the condition of adopting the same outer tube body structure, the water flow of the traditional annular scheme can be increased to about 5L/min to about 9L/min; the problem of the reduction of the hot water output rate of the inner container caused by the reduction of the water flow is completely avoided.

It should be noted that the outer tube body 1, the inner sleeve 2 and the core tube 3 are all hydrophilic insulating pieces, such as PPR pieces, PA pieces, PP pieces, etc.; the leakage current can be reduced better. In this embodiment, the outer tube 1 and the inner tube 2 are integrally formed. During design, the inner diameters and the lengths of the first flow passage 4, the second flow passage 5 and the third flow passage 6 need to meet the design requirement that the leakage current is less than 5mA, so that the water resistance type electric shock prevention device can play a role, and the safety is ensured. In particular, in order to facilitate connection of the water resistance type electric shock prevention device to a connection object such as a water heater, it is preferable that the outer wall of the water resistance type electric shock prevention device is provided with a shape, such as a hexagon, which is convenient to detach by using a tool.

The two ends of the outer tube body 1 are respectively provided with an external thread insert 7 and an internal thread insert 8. The combined design of the external thread insert 7 and the internal thread insert 8 is convenient for realizing the connection of the water resistance type electric shock prevention device with the water heater joint and the external pipeline, and has good universality and convenient installation and use. In addition, the arrangement of the internal thread insert 8 is also convenient for the installation and fixation of the sealing ring 10.

In this embodiment, it is preferable that the male insert 7 and the female insert 8 are made of metal members, such as copper members, stainless steel members, etc., so as to achieve sufficient strength and torsion.

It should be noted that a filter screen 15 is arranged at the inlet of the first flow channel 4, and a U-shaped notch is arranged on the tube wall of the core tube 3 for communicating the first flow channel 4 with the second flow channel 5; the inner sleeve 2 is sleeved on the core pipe 3, and the lower edge of the inner sleeve 2 is higher than the bottom of the core pipe 3 and is used for communicating the second flow channel 5 with the third flow channel 6. The advantage of this arrangement is that the assembly of the inner sleeve 2 and the core tube 3 is facilitated, and no gap needs to be reserved on the top of the core tube 3 for water passing. Of course, those skilled in the art may use water holes with other shapes such as circular through holes, oval through holes, square through holes, etc. instead of the U-shaped notches, and the present invention is not limited to this embodiment.

A positioning structure 14 is provided between the outer tube 1 and the inner tube cover 2. Here, the positioning structure 14 is used to prevent the inner sleeve 2 from rotating in the outer tube body 1, which would result in a low space utilization and a low water flow rate of the second flow channel, and also would risk blocking of the second flow channel. The arrangement of the positioning structure 14 can avoid the change of the sectional areas of the second flow passage and the third flow passage caused by the rotation of the inner sleeve 2, and ensure that the water flow in the use process is consistent with the initial design.

In this embodiment, it is preferable that the positioning structure 14 includes: the convex structure of setting on outer body 1, and set up interior sleeve pipe 2 go up with convex structure complex concave structure utilizes concave-convex structure to carry on spacingly, can prevent effectively that interior sleeve pipe and outer body from taking place to rotate. Obviously, the skilled person can interchange the positions of the above-mentioned male structure and the above-mentioned female structure according to different needs, for example, the female structure is provided on the outer tube body 1, and the corresponding male structure is provided on the inner sleeve 2; the present embodiment is not limited.

It should be emphasized that, compared with the CN 212390631U in the prior art, the injection molding of the inner sleeve 2 in this embodiment is simpler, the manufacturability is good, the manufacturing cost is low, and a strong support is provided for replacing the built-in electricity-proof wall with the external electricity-proof wall.

Compared with various external electricity-proof wall structures in the prior art, the water-resistance type electricity-proof device provided by the embodiment has the technical effects of small volume and large flow, and also has the advantages of good manufacturability, low cost and good reliability, and has great popularization and use values.

It should also be emphasized that an inner jacket tube can additionally be inserted outside the inner jacket tube 2, so that two inner jacket tubes can be stacked to form 5 flow channels. Of course, without limiting the outer casing volume, the number of inner casings may be n, and accordingly, the number of flows becomes 2n +1 (n =1,2, 3.).

As shown in fig. 5, in practical application, the water resistance type electric shock protection device 13 is installed outside the water inlet and the water outlet of the electric water heater 9, and adopts a reciprocating streaming manner to extend a water path in a limited space, extend water resistance, reduce leakage current of the electric water heater, and ensure the use safety of the electric water heater. Obviously, when the water resistance type electric shock protection device 13 is installed on the water inlet pipe 11 or the water outlet pipe 12 of the electric water heater 9, only the water flow direction is changed, and there is no other difference in performance and use effect.

Referring to fig. 6, a boss is provided on the inner sleeve 2, the boss is of a hollow structure, and the inner sleeve 2 is matched with a water inlet pipe 11 of the electric water heater through the boss. Here, the benefit of setting up the boss is, is convenient for realize the installation cooperation of external electric wall and inlet tube of preventing, can prevent with the inlet tube with external electric wall structure constitution part that prevents, reduces the material, reduce cost, reduces the installation step, raises the efficiency. In other embodiments, the bosses may also be omitted. Obviously, the above-mentioned boss can also cooperate with the water outlet pipe 12 of the electric water heater, as shown in fig. 7, can achieve the similar technical effects as this embodiment, and will not be described here again.

It will be appreciated by those skilled in the art from the foregoing description of construction and principles that the utility model is not limited to the specific embodiments described above, and that modifications and substitutions based on the teachings of the art may be made without departing from the scope of the utility model as defined by the appended claims and their equivalents. The details not described in the detailed description are prior art or common general knowledge.

Claims (10)

1. A water-resistance type electric shock preventing device comprising: the core tube is arranged in the outer tube body and is communicated with one end of the outer tube body, so that an inner cavity of the core tube forms a first flow channel; the inner sleeve is embedded from the other end of the outer tube body and sleeved on the core tube through the second inner cavity, the second inner cavity forms a second flow channel, and the first inner cavity forms a third flow channel; the first flow channel, the second flow channel and the third flow channel are communicated in a roundabout way; the core pipe is eccentrically arranged in the outer pipe body, the second inner cavity is sleeved on the core pipe and then is divided into a left part and a right part by the core pipe, and the first flow passage, the second flow passage and the third flow passage are all in a single cylinder shape.

2. The water-resistant electric shock preventing device according to claim 1, wherein the cross-sectional area of the second cavity is more than twice the cross-sectional area of the first cavity.

3. The water-resistance electric shock prevention device as recited in claim 1 wherein the difference between the cross-sectional areas of the first flow channel, the second flow channel and the third flow channel is less than or equal to 20mm²。

4. A water-resistive electric shock preventer according to claim 1,2 or 3, wherein the cross-sectional areas of the first flow passage, the second flow passage and the third flow passage are the same.

5. The water-resistant electric shock preventing device according to claim 1, wherein the outer tube body, the inner sleeve and the core tube are all hydrophilic insulators, and the hydrophilic insulators are PPR pieces, PA pieces or PP pieces.

6. The water resistance type electric shock prevention device according to claim 1, wherein an external thread insert and an internal thread insert are respectively arranged at two ends of the outer tube body, and a sealing ring is arranged in the internal thread insert; the external thread insert and the internal thread insert are both metal pieces.

7. The water-resistance electric shock preventing device according to claim 1, wherein a filter screen is provided at an inlet of the first flow passage, and a water through hole is provided in a pipe wall of the core pipe for communicating the first flow passage with the second flow passage; and the inner sleeve is sleeved on the core pipe, and the lower edge of the inner sleeve is higher than the bottom of the core pipe and is used for communicating the second flow channel with the third flow channel.

8. The water-resistance electric shock prevention device as claimed in claim 1 wherein a positioning structure is provided between the outer tube and the inner tube to prevent the inner tube from rotating; the positioning structure includes: a male/female structure disposed on the outer body, and a female/male structure disposed on the inner cannula that mates with the male/female structure.

9. The water-resistance electric shock prevention device according to claim 1, wherein a boss which is matched with an inlet pipe or an outlet pipe of an electric water heater is arranged on the inner sleeve, and the boss is of a hollow structure and is communicated with the third flow channel.

10. An electric water heater, characterized in that the water resistance type electric shock preventing device as claimed in any one of claims 1-9 is installed on the water inlet and/or the water outlet of the electric water heater.

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