CN211457386U

CN211457386U - PTC water heater

Info

Publication number: CN211457386U
Application number: CN202020225214.XU
Authority: CN
Inventors: 吴翔; 闻俊涛; 鄂新刚
Original assignee: SHENZHEN SHARING ELECTRONICS CO Ltd
Current assignee: SHENZHEN SHARING ELECTRONICS CO Ltd
Priority date: 2020-02-27
Filing date: 2020-02-27
Publication date: 2020-09-08
Anticipated expiration: 2030-02-27

Abstract

The utility model discloses a PTC water heater belongs to heater technical field. The utility model discloses a PTC water heater include the PTC heat-generating body and with the metal casing that the PTC heat-generating body links to each other, be provided with the water cavity in the metal casing, the metal casing with cross and set up the first insulation layer between the water cavity, with will metal casing and the water insulation in the water cavity. The utility model discloses a PTC water heater has better barrier propterty, can be with crossing water cavity and external insulation to avoid crossing the water in the water cavity electrified and cause the potential safety hazard to the user.

Description

PTC water heater

Technical Field

The utility model relates to a heater technical field, concretely relates to PTC water heater.

Background

The PTC water heater is widely applied to the fields of SPA and the like, water flows through a water cavity of the PTC water heater, the water in the water cavity is heated through the PTC heating element, and the heated water is contacted with a human body. In the prior art, a water cavity of the PTC water heater is made of a conductive material, when the PTC heating element leaks electricity, voltage is applied to water in the water cavity, and the heated water is in contact with a human body, so that the human body can generate electric shock feeling or even electric shock, and potential safety hazards exist.

SUMMERY OF THE UTILITY MODEL

In order to solve the not enough or partial not enough of solving prior art of prior art, the embodiment of the utility model provides a PTC water heater can insulate metal casing and the water of crossing in the water cavity to guarantee PTC water heater's security.

An embodiment of the utility model provides a PTC water heater, including the PTC heat-generating body and with the metal casing that the PTC heat-generating body links to each other, be provided with the water cavity in the metal casing, the metal casing with set up the first insulation layer between the water cavity, with will metal casing is with crossing the water insulation in the water cavity.

Optionally, the first insulating layer includes a plastic powder layer sprayed on an inner wall of the metal shell connected to the water passing cavity.

Optionally, the first insulating layer includes an electrophoresis layer disposed on an inner wall of the metal housing connected to the water passing cavity and a plastic powder layer covering an outer surface of the electrophoresis layer.

Optionally, a second insulating layer is provided on a surface of the PTC heating element.

Optionally, the second insulating layer includes a PI film layer covering the surface of the PTC heating element and an aluminum foil insulating film provided on an outer surface of the PI film layer.

Optionally, the metal housing is an aluminum housing.

Optionally, a ground wire for grounding is connected to the metal housing.

Optionally, the PTC heating element is strip-shaped, and two opposite side surfaces of the PTC heating element are respectively attached and connected with the metal shell.

Optionally, the metal shells on two opposite sides of the PTC heating element are a connected whole.

Optionally, a plurality of reserved mounting holes are formed in the metal shell.

The utility model has the advantages that:

the utility model discloses a PTC water heater, including the PTC heat-generating body and with the metal casing that the PTC heat-generating body links to each other, be provided with the water cavity in the metal casing, the metal casing with cross and set up the first insulation layer between the water cavity, with will metal casing and the water insulation in the water cavity. The utility model discloses a PTC water heater has better barrier propterty, can be with crossing water cavity and external insulation to avoid crossing the water in the water cavity electrified and cause the potential safety hazard to the user.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of a PTC water heater according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a PTC water heater according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a first insulating layer according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a PTC heating element according to an embodiment of the present invention.

Wherein, the corresponding relations between the reference numbers and the part names in fig. 1 to fig. 4 are as follows:

1. a PTC heating element; 10. a second insulating layer; 100. a PI film layer; 101. an aluminum foil film layer; 2. a metal housing; 20. mounting holes; 3. a water passing cavity; 4. a first insulating layer; 40. an electrophoretic layer; 41. a plastic powder layer.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

As fig. 1, shows the structure of the PTC water heater of an embodiment of the present invention, as fig. 2, shows the structure of the PTC water heater of another embodiment of the present invention, refer to fig. 1 and fig. 2, an embodiment of the present invention provides a PTC water heater, including PTC heating element 1, metal shell 2 is connected with PTC heating element 1, is provided with water cavity 3 in metal shell 2, is provided with first insulation layer 4 between metal shell 2 and water cavity 3, and first insulation layer 4 insulates the water inside water cavity 3 from metal shell 2. The metal shell 2 has good heat conducting performance, and is connected with the PTC heating element 1 to conduct heat generated by the PTC heating element 1 and heat water in the water passing cavity 3, generally, the PTC heating element 1 is arranged in an insulating mode, however, when the insulation structure of the PTC heating element 1 is damaged, water in the PTC heating element 1, the metal shell 2 and the water passing cavity 3 can be electrically connected, at the moment, if the water in the water passing cavity 3 is in contact with a human body, an electric shock feeling can be generated slightly, and an electric shock can be seriously caused, in the embodiment, the first insulation layer 4 is arranged between the metal shell 2 and the water passing cavity 3, so that the problem that the water in the water passing cavity 3 is electrified due to electric leakage of the PTC heating element 1 can be avoided, and the safety of the PTC water heater is improved.

In an alternative embodiment of the present invention, the first insulating layer 4 comprises a plastic powder layer coated on the inner wall of the metal shell 2 connected to the water passing cavity 3. The molding powder is a material of a common plastic spraying process, and is simply sprayed on the surface of the material by air supplied by compressed air after being heated at high temperature. The plastic powder layer is formed by plastic powder, the plastic has good insulativity, and the plastic powder layer is formed at the joint of the metal shell 2 and the water passing cavity 3 through the plastic powder, so that good electric barrier capability can be achieved.

As shown in fig. 1 and 2, the metal shell 2 and the water passing cavity 3 extend in the direction of the view angle shown in the figures, and it is difficult to directly spray the metal shell 2 to form a plastic powder layer. In an optional embodiment, the spraying tool is in a long rod shape, and the tail end of the spraying tool is bent, so that the spraying tool can extend into the water passing cavity 3 for spraying, the spraying surface can be over against the joint of the metal shell 2 and the water passing cavity 3 to ensure the spraying quality, or in an optional embodiment, the spraying tool can be arranged in the middle of the metal shell 2 and the water passing cavity 3 to be provided with a dismounting surface, the metal shell 2 and the water passing cavity 3 are formed by splicing two or more sections of parts, so that the parts are respectively sprayed to form a plastic powder layer, then the joints are sprayed and insulated in a key mode after the sections are spliced, but attention needs to be paid, and sealing treatment needs to be carried out after the sections are spliced to avoid water leakage.

In another alternative embodiment of the present invention, as shown in fig. 1 to 3, the first insulating layer 4 includes an electrophoretic layer 40 disposed on the inner wall of the intersection of the metal shell 2 and the water passing cavity 3 and a molding powder layer 41 covering the outer surface of the electrophoretic layer 40. It is known that the metal housing 2 and the water flowing cavity 3 extend along a direction perpendicular to the direction shown in fig. 1 and 2, and even though the spraying tool can extend into the water flowing cavity 3 and adapt to the structure of the water flowing cavity 3, it is difficult for an operator to clearly distinguish the spraying condition in the water flowing cavity 3, and thus it is still troublesome to form the first insulating layer 4, and it is difficult to really ensure the insulating property of the first insulating layer 4, and for this reason, in the present embodiment, the electrophoresis process is used to form the electrophoresis layer 40 having the insulating property at the intersection of the metal housing 2 and the water flowing cavity 3. The principle of the electrophoretic layer 40 is the same as the formation principle of the electrophoretic paint, that is, the electrophoretic layer 40 corresponds to the electrophoretic paint having the insulating property. Electrophoretic paint, also called electrophoretic paint, and electrophoretic paint and coating method are industrially applied in the 60 s of 20 th century, a fully closed circulating system can be operated by adopting the electrophoretic paint, the utilization rate of the paint can reach about 95 percent, the electrophoretic paint takes water-soluble or water-dispersible ionic polymer as a film forming matter, and a coated workpiece can be an anode or a cathode. In this embodiment, the water passing cavity 3 is filled with an electrolyte, the metal case 2 serves as a cathode of the electrode, an anode connected to the metal case 2 is disposed in the electrolyte, and after the electrolyte is powered on, under the action between the metal case 2 and the anode, ions generated by the cathode are gradually deposited to form a film, and finally the electrophoretic layer 40 is formed. Note that after the electrophoretic layer 40 is formed, the electrophoretic layer 40 is also subjected to baking or the like.

Adopt electrophoresis layer 40 to compare in relying on the spraying to form first insulating layer 4 as first insulating layer 4, it is more convenient to prepare, and fashioned membrane is more even, and the effect is better, but electrophoresis layer 40's insulating properties often is less than the insulating nature of plastic powder layer. Therefore, in an alternative embodiment of the present invention, a plastic powder layer 41 is further disposed on the outer surface of the electrophoretic layer 40, and the plastic powder layer 41 may be formed by spraying on the surface of the electrophoretic layer 40 by using the above-mentioned spraying process. However, in this embodiment, compared to the above-mentioned solution using only the plastic powder layer as the first insulating layer 4, the requirement for spraying is low, the plastic powder layer 41 supplements and reinforces the insulating property of the electrophoretic layer 40, and the plastic powder layer 41 does not depend on the plastic powder layer 41 to insulate the metal housing 2 from the water in the water passing cavity 3, so the molding of the plastic powder layer 41 is more convenient in this embodiment.

The metal shell 2 can be made of aluminum, has good electric and heat conducting properties, is relatively cheap and has strong machinability, and is beneficial to reducing the manufacturing cost of the PTC water heater.

As shown in fig. 4, in the embodiment of the present invention, a second insulating layer 10 is provided on the surface of the PTC heating element 1. The second insulating layer 10 serves to electrically isolate the electric device to which the PTC heating element 1 is connected from the metal case 2.

The second insulating layer 10 includes a PI film layer 100 covering the surface of the PTC heating element 1 and an aluminum foil insulating film 101 provided on the outer surface of the PI film layer 100. The PI (polyimide) film is formed by performing polycondensation and casting on pyromellitic dianhydride and diaminodiphenyl ether in a strong polar solvent to form a film and then performing imidization, is yellow and transparent, has excellent high temperature and low temperature resistance, electrical insulation, cohesiveness, radiation resistance and medium resistance, is particularly suitable to be used as an insulation material of the PTC heating element 1, can bear the high-temperature environment in which the PTC heating element 1 works, and ensures the insulation of the PTC heating element 1. In this embodiment, an aluminum foil insulating film 101 is further provided on the outer surface of the PI film layer 100 to further enhance the insulating performance of the PTC heater 1 and protect the PI film layer 100.

According to the technical scheme, the second insulating layer 10 and the first insulating layer 4 are respectively arranged on the surface of the PTC heating body 1 and the joint of the metal shell 2 and the water passing cavity 3, and the two layers of insulating protection structures are matched with each other, so that the PTC water heater is ensured to be in good insulation, and even if one insulating layer is damaged, the water heated by the PTC water heater is not electrified due to electric leakage. In addition, in the embodiment of the present invention, the metal shell 2 is further connected to a ground wire (not shown in the figure) for grounding. When the metal shell 2 is grounded through the ground wire during operation, even if the first insulating layer 4 and the second insulating layer 10 are damaged, the heated water can be prevented from contacting with a human body to get an electric shock.

Referring to fig. 1 and 2, the PTC heating element 1 is in a strip shape, and the PTC heating element 1 and the metal shell 2 are in surface contact to perform heat exchange, so as to increase the heat exchange efficiency. Optionally, the metal shells 2 are respectively attached to two opposite side surfaces of the PTC heating element 1, and the water passing cavities 3 are respectively arranged in the metal shells 2 at the two sides of the PTC heating element 1, so as to improve the utilization efficiency of the PTC heating element 1.

Alternatively, the metal case 2 on the opposite two side surfaces of the PTC heating element 1 is a connected whole, in this embodiment, a mounting groove for mounting the PTC heating element 1 may be formed in advance between the metal case 2, and after the PTC heating element 3 is mounted in the mounting groove, in order to ensure that the metal case 2 is sufficiently attached to the PTC heating element 1, the metal case 2 may be optionally pressed from the end of the metal case 2 away from the PTC heating element 1, so that the end of the metal case 2 connected to the PTC heating element 1 is deformed toward the PTC heating element 1, and the outer surface of the end of the metal case 2 toward the PTC heating element 1 is sufficiently attached to the PTC heating element 1.

Alternatively, the metal shells 2 on the two opposite side surfaces of the PTC heating element 1 are two separate bodies, and the metal shells 2 on the two opposite side surfaces of the PTC heating element 1 are respectively attached to the two side surfaces of the PTC heating element 1, so that the above extrusion method can be adopted to ensure sufficient attachment, and the separate structure is more convenient to install.

Still be provided with a plurality of mounting holes 20 of reserving on the metal casing 2, the PTC water heater of this embodiment passes through mounting hole 20 carries out quick, reliable installation fixedly.

In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of description, but do 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, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the communication may be direct, indirect via an intermediate medium, or internal to both elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. The PTC water heater is characterized by comprising a PTC heating body and a metal shell connected with the PTC heating body, wherein a water passing cavity is arranged in the metal shell, and a first insulating layer is arranged between the metal shell and the water passing cavity to insulate the metal shell from water in the water passing cavity.

2. The PTC water heater according to claim 1, wherein the first insulating layer comprises a plastic powder layer sprayed on an inner wall of the metal housing that meets the water passing cavity.

3. The PTC water heater according to claim 1, wherein the first insulation layer comprises an electrophoretic layer disposed on an inner wall of the metal case connected to the water passing chamber, and a plastic powder layer covering an outer surface of the electrophoretic layer.

4. The PTC water heater according to claim 1, wherein a surface of the PTC heat-generating body is provided with a second insulating layer.

5. The PTC water heater according to claim 4, wherein the second insulating layer comprises a PI film layer covering a surface of the PTC heating element and an aluminum foil insulating film provided on an outer surface of the PI film layer.

6. The PTC water heater according to claim 1, wherein the metal housing is an aluminum shell.

7. The PTC water heater according to claim 6, wherein a ground wire for grounding is connected to the metal housing.

8. A PTC water heater according to claim 1, wherein the PTC heating element is strip-shaped, and the opposite side surfaces of the PTC heating element are respectively attached to the metal case.

9. A PTC water heater according to claim 8, wherein the metal housings of opposite sides of the PTC heating element are a connected whole.

10. The PTC water heater according to claim 1, wherein the metal housing is provided with a plurality of mounting holes.