Rod-shaped submerged PTC (Positive Temperature Coefficient) liquid heater

Abstract

The utility model discloses a rod-shaped submerged PTC (Positive Temperature Coefficient) liquid heater, which comprises a heating assembly, the heating assembly comprises PTC heating strips, the PTC heating strips are embedded on a PTC heating strip mounting mother tire, and the PTC heating strip mounting mother tire is sealed between an inner-layer stainless steel tube and an outer-layer stainless steel tube which are concentrically arranged. A connecting piece is arranged above the heating assembly, and a plurality of power supply binding posts used for being connected with power supply outgoing lines of the PTC heating strips are arranged above the connecting piece; the PTC heating strip directly exchanges heat with circulating water, the heat loss is small, the heat transfer temperature difference between the PTC heating strip and the circulating water is small, the temperature of the PTC heating strip is low, the service life is long, the unique heating structure design is adopted, the positive temperature coefficient (PTC) performance is not obvious when the water temperature ranges from 25 DEG C to 85 DEG C, the water temperature rises from 25 DEG C to 85 DEG C, the heating power per kW is reduced by 3%, and the heating power is almost constant.

Description

Technical Field

[0001] The utility model relates to a heater, in particular to a rod-type submersible PTC liquid heater. Background Art

[0002] As a heating component of electric water boilers, PTC liquid heaters have been widely used by domestic electric boiler manufacturers in recent years. Many PTC liquid heater products have appeared on the market. Looking at these PTC liquid heaters, they all have a through-type heating structure. The heating structure of the through-type PTC liquid heater is designed so that the circulating water flows in from the water inlet and out from the water outlet of the through-type PTC liquid heater, that is, the circulating water of the electric boiler flows in from the water inlet and out from the water outlet of the through-type PTC liquid heater through the hydraulic distribution of the upper and lower water distributors, thereby heating the circulating water.

[0003] Disadvantages of existing products:

[0004] Large heat loss.

[0005] The heating structure of the through-type PTC liquid heater is designed as circulating water flowing into the water inlet and out of the water outlet of the through-type PTC liquid heater, and the PTC heating strip indirectly exchanges heat with the circulating water, with many heat transfer links and large heat loss.

[0006] The service life is short.

[0007] The heating structure of the through-type PTC liquid heater is designed as circulating water flowing in from the water inlet and out from the water outlet of the through-type PTC liquid heater. The PTC heating strip indirectly exchanges heat with the circulating water. There is a large heat transfer temperature difference between the two. The temperature of the PTC heating strip is relatively high. If the PTC heating strip works under high temperature conditions for a long time, its service life will be shortened.

[0008] Power decreases as temperature increases.

[0009] The heating power of the through-type PTC liquid heater decreases with the increase of temperature. The positive temperature coefficient characteristic (PTC) is significant in the water temperature range of 25℃ to 85℃. According to the measured data, the heating power per kW decreases by 5‰ for every 1℃ increase in water temperature. When the water temperature increases from 25℃ to 85℃, the heating power per kW decreases by 30%.

[0010] The failure rate is high.

[0011] Since the through-type PTC liquid heater has at least two connection ports, namely the water inlet and the water outlet, it needs to be connected through the upper and lower water dividers. Too many connection ports increase the leakage points and the failure rate is high.

[0012] The manufacturing cost is relatively high.

[0013] Since the through-type PTC liquid heater has at least two connection ports, namely a water inlet and a water outlet, which need to be connected through upper and lower water dividers, too many connection ports increase the labor cost of boiler manufacturing. Utility Model Content

[0014] The utility model provides a rod-type submersible PTC liquid heater for overcoming the defects of large heat loss, high failure rate and short service life of the through-type PTC liquid heater in the prior art.

[0015] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0016] The utility model discloses a rod-type submersible PTC liquid heater, comprising a heating component, wherein the heating component comprises a PTC heating strip, the PTC heating strip is embedded in a PTC heating strip mounting mother tire, the PTC heating strip mounting mother tire is sealed between an inner stainless steel pipe and an outer stainless steel pipe which are concentrically arranged, a connecting piece is provided above the heating component, and a plurality of power supply terminals for connecting power supply lead wires of the PTC heating strip are provided above the connecting piece.

[0017] Furthermore, the external thread of the heating component on the heating component is connected to the internal thread of the connecting piece.

[0018] Furthermore, the PTC heating strip installation mother tire is sealed with an insulating thermally conductive sealant.

[0019] Furthermore, the PTC heating strip is made of a PTC ceramic heating sheet, and the outside is insulated and packaged by a polyimide film to form a strip structure.

[0020] Furthermore, the connector is provided with an external connector thread, which is used for threaded connection and installation of the threadedly mounted rod-type submersible PTC liquid heater on the electric boiler.

[0021] The beneficial effects achieved by the utility model are:

[0022] Less heat loss.

[0023] The PTC heating strip of the threaded rod type submersible PTC liquid heater directly exchanges heat with the circulating water, resulting in less heat loss.

[0024] Long service life.

[0025] The PTC heating strip of the threaded rod type submersible PTC liquid heater directly exchanges heat with the circulating water. The heat transfer temperature difference between the two is small, the temperature of the PTC heating strip is low, and the service life is long.

[0026] The heating power is constant.

[0027] Due to its unique heating structure design, the positive temperature coefficient characteristic (PTC) of the threaded rod submersible PTC liquid heater is not obvious in the water temperature range of 25℃ to 85℃. When the water temperature rises from 25℃ to 85℃, the heating power per kW decreases by 3%, and the heating power is almost constant.

[0028] The failure rate is reduced.

[0029] The electric water boiler with threaded rod submersible PTC liquid heater has one-half fewer connection ports than the electric water boiler with through-type PTC liquid heater, and the failure rate is reduced by one-half.

[0030] Manufacturing costs are reduced.

[0031] The number of connection ports of an electric water boiler with a threaded rod type submerged PTC liquid heater is reduced by half compared to an electric water boiler with a through-type PTC liquid heater, and the labor cost of boiler manufacturing is reduced by half. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0033] Figure 1 It is a structural schematic diagram of the utility model;

[0034] Figure 2 It is a structural schematic diagram of the connecting piece of the utility model;

[0035] Figure 3 It is a structural schematic diagram of the heating component of the utility model;

[0036] Figure 4 It is a schematic cross-sectional view of the end portion of the heating component of the utility model.

[0037] In the figure: 1. PTC heating strip; 2. Inner stainless steel tube; 3. PTC heating strip mounting mother tire; 4. Outer stainless steel tube; 5. Connector; 6. Connector external thread; 7. Power terminal; 8. Heating component; 9. Heating component external thread. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0039] Example 1

[0040] like Figure 1-4As shown, a rod-type submersible PTC liquid heater includes a heating component 8, wherein the heating component 8 includes a PTC heating strip 1, wherein the PTC heating strip 1 is embedded in a PTC heating strip mounting matrix 3, wherein the PTC heating strip mounting matrix 3 is sealed between an inner stainless steel tube 2 and an outer stainless steel tube 4 which are concentrically arranged, wherein a connecting piece 5 is provided above the heating component 8, wherein a plurality of power terminals 7 for connecting the power lead wires of the PTC heating strip 1 are provided above the connecting piece 5.

[0041] The external thread 9 of the heating component 8 is connected to the internal thread of the connecting member 5 .

[0042] The PTC heating strip mounting mother tire 3 is sealed with insulating heat-conductive sealant.

[0043] The PTC heating strip 1 is made of a PTC ceramic heating sheet, and is insulated and packaged with a polyimide film to form a strip structure.

[0044] The connector 5 is provided with an external connector thread 6, which is used for threaded connection and installation of the threadedly mounted rod-type submersible PTC liquid heater on the electric boiler.

[0045] Working principle: The threaded rod-type submersible PTC liquid heater is installed on the furnace of the atmospheric pressure electric hot water boiler through the external thread 6 of the connector. The heating component 8 is directly submerged in the water. After power is turned on, the heating component 8 directly heats the water. The heat generated by the PTC heating strip 1 is completely absorbed by the water. There are fewer heat transfer links, less heat transfer loss, and high thermoelectric conversion efficiency.

[0046] It should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the above embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the above embodiments, or to replace some of the technical features therein by equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention. The terms used in the description of this application are only for describing specific implementations, and are not intended to limit the exemplary implementations according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and devices known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and devices should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0047] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0048] It should be noted that, in the description of the present application, the orientation or positional relationship indicated by terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these orientation words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

Claims

1. A rod-type submersible PTC liquid heater, characterized in that: It includes a heating component, which includes a PTC heating strip. The PTC heating strip is embedded in a PTC heating strip mounting mother mold. The PTC heating strip mounting mother mold is sealed between an inner stainless steel tube and an outer stainless steel tube that are concentrically arranged. A connecting piece is provided above the heating component, and a plurality of power terminals for connecting the power lead wires of the PTC heating strip are provided above the connecting piece.

2. The rod-type submersible PTC liquid heater according to claim 1, characterized in that: The external thread of the heating component on the heating component is connected with the internal thread of the connecting piece.

3. The rod-type submersible PTC liquid heater according to claim 1, characterized in that: The PTC heating strip installation mother tire is sealed by insulating heat-conductive sealant.

4. The rod-type submersible PTC liquid heater according to claim 1, characterized in that: The PTC heating strip is made of a PTC ceramic heating sheet, and the outside is insulated and packaged by a polyimide film to form a strip structure.

5. The rod-type submersible PTC liquid heater according to claim 1, characterized in that: The connecting piece is provided with an external connecting piece thread, which is used for threaded connection and installation of a rod-type submersible PTC liquid heater installed on an electric boiler.

Images