CN205593158U - PTC concurrent flow heater - Google Patents

Abstract

The utility model discloses a PTC parallel flow heater, comprising: a liquid separating pipe, one end of which communicates with a liquid inlet; a liquid collecting pipe, one end of which communicates with a liquid outlet; n mixing pipes, any mixing pipe having a An opening and a second opening; n+1 heat exchange tube groups, which include a plurality of flat heat exchange tubes arranged in parallel and at intervals, and a group of PTC heating elements are arranged between any two adjacent flat heat exchange tubes, wherein , when n=1, one end of the two heat exchange tube groups is connected with the other end of the liquid distribution pipe and the liquid collection pipe respectively, and the other ends are connected with the mixing pipe; when n>1, the first heat exchange tube group and the One end of the second heat exchange tube group communicates with the other end of the liquid distribution pipe and the liquid collection pipe respectively, and the other ends of the first heat exchange tube group and the second heat exchange tube group respectively communicate with the first opening or the first opening of one of the mixing tubes. The two openings are connected, and the two ends of the remaining heat exchange tube groups are respectively connected with the two mixing tubes. The heating efficiency of the heater of the utility model is higher, and the temperature of the water outlet is more stable.

Description

PTC parallel flow heater

technical field

The utility model relates to the technical field of PTC heaters. More specifically, the utility model relates to a PTC parallel flow heater.

Background technique

After the PTC thermistor is energized, it will heat up to the resistance value and enter the transition zone, and its surface temperature will remain constant. This temperature is only related to the Curie temperature and the applied voltage of the PTC thermistor, and basically has nothing to do with the ambient temperature. Ordinary PTC heaters are heating devices designed by using constant temperature heating PTC thermistor constant temperature heating characteristics. However, since PTC elements cannot be directly used to heat liquids, most PTC liquid heaters use partition heat exchange, that is, PTC heating elements pass through the pipe wall. For heat exchange, the heat exchange effect of this method depends on the thermal conductivity of the material itself, the heat transfer area and the circulation time.

At present, the common structure of the PTC liquid heater is composed of the heater body (heating chamber) and the PTC element chamber, which solves the problem of water and electricity separation heating, and the heating chamber uses a variety of structural forms, and the gap between its surface and the PTC element is relatively small. The large size cannot fit well, which affects the heat transfer; because the thermal conductivity of aluminum itself is smaller than that of copper, in order to increase the heat conduction area and flow time, the structure is often made into a multi-stroke method, so that the flow rate is fast and the heating time is short, requiring a large However, metal aluminum is easily oxidized when heated at high temperature for a long time, resulting in a decrease in heat transfer efficiency and increased energy consumption.

Utility model content

An object of the present invention is to solve at least the above-mentioned problems and provide at least the advantages which will be described later.

Another purpose of the utility model is to provide a PTC parallel flow heater, by setting a PTC heating element between two flat heat exchange tubes to form the main body of the heater, so as to realize separate heating of water and electricity, and to realize heating by multiple mixing tubes. The mixing and splitting of water makes the water go through the mixed flow to improve the stability of the heater outlet temperature.

In order to achieve these purposes and other advantages according to the utility model, a PTC parallel flow heater is provided, comprising:

A liquid pipe, one end of which communicates with the liquid inlet;

A liquid collecting pipe, one end of which communicates with the liquid outlet;

n mixing tubes, for any mixing tube, it has a first opening and a second opening, n is a natural number greater than or equal to 1;

n+1 heat exchange tube groups, for any heat exchange tube group, it includes a plurality of flat heat exchange tubes arranged in parallel and at intervals, the flat heat exchange tubes are provided with through holes extending along their length direction, any 2 A group of PTC heating elements is arranged between two adjacent flat heat exchange tubes, wherein, when n=1, one end of the two heat exchange tube groups communicates with the other end of the liquid distribution pipe and the liquid collection pipe respectively, and the other ends are both It communicates with the mixing tube; when n>1, one end of the first heat exchange tube group communicates with the other end of the liquid pipe, one end of the second heat exchange tube group communicates with the other end of the liquid collector, and the first heat exchange tube The other end of the group communicates with the first opening of one of the mixing tubes, the other end of the second heat exchange tube group communicates with the second opening of one of the mixing tubes, and the two ends of the remaining heat exchange tube groups communicate with the two mixing tubes respectively ;

The liquid distribution pipe, the liquid collection pipe, the mixing pipe and the flat heat exchange pipe are all made of red copper.

Preferably, in the PTC parallel flow heater, the plurality of flat heat exchange tubes are arranged at equal intervals.

Preferably, in the PTC parallel flow heater, four flat through-holes are arranged in the plurality of flat heat exchange tubes along the width direction thereof.

Preferably, in the PTC parallel flow heater, n+1 heat exchange tube groups are arranged in parallel.

Preferably, in the PTC parallel flow heater, a set of PTC heating elements includes two PTC heating elements, and the leads of the two PTC heating elements are arranged facing each other inwardly.

Preferably, in the PTC parallel flow heater, the n mixing tubes are 3 mixing tubes.

Preferably, the PTC parallel flow heater includes 3-5 flat heat exchange tubes for any heat exchange tube group.

The utility model at least includes the following beneficial effects:

The heater of the utility model has a simple structure and is easy to realize industrialized production;

The pipes used in the heater of the utility model are all made of copper, which is not easy to oxidize and durable;

The heater of the utility model is heated by parallel flow and multi-circuit overcurrent, and has high heat exchange efficiency. It only needs to set the number of flat heat exchange tubes or the number of mixing tubes in each heat exchange tube group to realize the heating requirement, and the equipment processing is simple. , and can easily meet heaters with different heating power;

The heater of the utility model uses a mixing tube, and the fluid in the flat heat exchange tube undergoes mixed flow treatment, so that the temperature of the liquid outlet is more stable, avoiding high-temperature burns or low-temperature cold, and providing convenience for consumers.

Other advantages, objectives and features of the utility model will partly be embodied through the following description, and partly will be understood by those skilled in the art through the research and practice of the utility model.

Description of drawings

Fig. 1 is the structural representation when the PTC parallel flow heater n=1 of the utility model;

Fig. 2 is a schematic structural view of the flat heat exchange tube described in the present invention;

Fig. 3 is the structural representation when the PTC parallel flow heater n=3 of the utility model;

Fig. 4 is the structural representation of PTC heating element;

Fig. 5 is a schematic diagram of the structural dimensions of the heater main body used in the first embodiment;

Fig. 6 is a schematic diagram of the dimension of the section A-A in Fig. 5 .

detailed description

The utility model will be described in further detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it by referring to the description.

It should be noted that the experimental methods described in the following embodiments, if no special instructions, are conventional methods, and the reagents and materials, if no special instructions, can be obtained from commercial sources; in the description of the utility model , the terms "landscape", "portrait", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" , "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply the referred devices or components Must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the invention.

As shown in Figure 1-6, the utility model provides a PTC parallel flow heater, including:

Liquid pipe 1, one end of which communicates with the liquid inlet;

Liquid collecting pipe 2, one end of which communicates with the liquid outlet;

n mixing tubes 3, for any mixing tube, it has a first opening and a second opening, n is a natural number greater than or equal to 1;

n+1 heat exchange tube groups, for any heat exchange tube group, it includes a plurality of flat heat exchange tubes 4 arranged in parallel and at intervals, and the flat heat exchange tubes 4 are provided with through holes extending along their length direction , the number of through holes in a flat heat exchange tube can be 1, 2, 3 or more, the number of through holes in the flat heat exchange tube shown in Figure 2 is 4, any two adjacent flat heat exchange tubes A group of PTC heating elements 5 are arranged between the tubes, wherein, when n=1, one end of the two heat exchange tube groups communicates with the other end of the liquid distribution tube 1 and the liquid collection tube 2 respectively, and the other ends are connected with the mixing tube 3 connected, as shown in Figure 1; when n>1, one end of the first heat exchange tube group communicates with the other end of the liquid pipe 1, and one end of the second heat exchange tube group communicates with the other end of the liquid collection pipe 2, The other end of the first heat exchange tube group communicates with the first opening of one of the mixing tubes 3, the other end of the second heat exchange tube group communicates with the second opening of one of the mixing tubes 3, and the other ends of the remaining heat exchange tube groups Be communicated with two mixing tubes respectively, the quantity of the mixing tube as shown in Figure 3 is 3, promptly n=3; The first opening and the second opening here correspond to the flow of the fluid entering and leaving the mixing tube with respect to the mixing tube respectively. Inlet and outlet, and any one of the first opening or the second opening communicates with the same side of a plurality of flat heat exchange tubes in a heat exchange tube group, which means that the first opening can have the same number as the plurality of flat heat exchange tubes Corresponding drain hole.

The liquid distribution pipe 1, the liquid collection pipe 2, the mixing pipe 3 and the flat heat exchange pipe 4 are all made of red copper.

In another technical solution, in the PTC parallel flow heater, the plurality of flat heat exchange tubes 4 are arranged at equal intervals, and the distance between any two flat heat exchange tubes can be equal to that of a PTC heating element. The thickness is appropriate, so that heat exchange can be fully performed, heat loss can be reduced, and the heating efficiency of the heater can be improved.

In another technical solution, in the PTC parallel flow heater, the plurality of flat heat exchange tubes 4 are provided with four flat through holes along the width direction thereof. The number of through holes in the flat heat exchange tube is related to its heating efficiency and its size. Since the size of the flat heat exchange tube is related to the size of the PTC heating element, setting the number of through holes reasonably will help to improve the heating efficiency of the heater.

In another technical solution, in the PTC parallel flow heater, n+1 heat exchange tube groups are arranged in parallel, so that the heat exchange tubes in the heater are in one plane, making the heater more compact , easy to achieve system insulation.

In another technical solution, for the PTC parallel flow heater, a group of PTC heating elements includes 2 PTC heating elements 5, and the leads of the 2 PTC heating elements 5 are arranged inwardly, so that a plurality of PTC heating elements The lead wires of the heating element are gathered in the center to form a lead wire interface 6 connected to an external power supply as shown in FIG. 1 , which makes the layout of the heater power supply circuit simple and reasonable.

In another technical solution, in the PTC parallel flow heater, the n mixing tubes are 3 mixing tubes 3, as shown in FIG. 3 .

In another technical solution, the PTC parallel flow heater includes 3-5 flat heat exchange tubes 4 for any heat exchange tube group.

The PTC liquid heater adopts the parallel flow tube heat exchange chamber and the PTC element to form the main body of the heater to realize the separation of water and electricity for heating. The heat exchange cavity is arranged in an array of multiple flat heat exchange tubes arranged in parallel, with a wall thickness of 0.5mm; between the flat heat exchange tubes arranged in adjacent arrays, a PTC element cavity is formed, and the flat heat exchange tubes and PTC elements can be fixed by screws Compression, the lead wire of the PTC element is arranged in the middle part of the heater body; the inlet and outlet and drainage pipes are connected with the liquid collection and distribution pipes to form a fluid inlet and outlet channel; when a large power is required, parallel flow heat exchange tubes and PTC devices can be added The quantity forms the main body of the composite heater; the main body of the heater has a compact structure, which is easy to realize system insulation.

PTC parallel flow liquid heater, the fluid flows through the liquid separation tube in turn, exchanges heat with the PTC element in the parallel flow heat exchange tube, mixes in the liquid mixing tube, conducts heat exchange again in the parallel flow heat exchange tube, and finally passes through The liquid collection pipe flows out; the liquid is in full contact with the inner wall of the pipe, and the heating is uniform, which can balance the multi-circuit flow, and the resistance is easy to balance, which can meet the requirements of different heating powers, and it is easy to realize circuit control and easy maintenance and replacement; the main body of the heater has a compact structure. It is easy to realize industrial optimization design and production.

<Implementation Mode 1>

In order to illustrate the beneficial effect of the PTC parallel flow heater of the present invention, the inventor of the present invention obtained the following related conclusions by means of experiments.

Test conditions: The heater body with the structure shown in Figure 1 is used, and the structural size of the heater body is used as shown in Figure 5. The size of the flat heat exchange tubes and their array layout dimensions refer to Figure 6, which is the size of Figure 5. A-A cross-sectional size diagram, the unit of each dimension in Figure 5 and Figure 6 is mm, the flat heat exchange tube and the PTC element are fixed and compressed by screws, and the inlet and outlet of the tube are standard 4-point interfaces; the size of the PTC element is 100mm×21mm×5mm, a total of 14 pieces, each with a voltage of 220V and a power of 160W; a 220V small circulating water pump with a head of 8m and a maximum flow of 60L/min.

Comparative test piece: a common PTC liquid heater (composed of serpentine heat exchange tubes and PTC heating elements), the inlet and outlet of the nozzle are standard 4-point interface, the size of the PTC element is 100mm×21mm×5mm, a total of 14 pieces, single Voltage 220V, power 160W.

Test method: Borrow 3 10-column steel radiators, then connect the water pump and heater in turn, fill the lap test system with water, and install a pressure sensor and a temperature sensor at the inlet end of the water pump and the outlet end of the heater respectively, set When the temperature at the inlet end of the water pump reaches 50°C, the system stops running, and no corresponding insulation measures are implemented for the heater part.

According to the real-time pressure and temperature test data, the pressure drop of the heater shown in the utility model patent is 1030Pa, and the pressure drop of the comparative test piece is 750Pa; the heater outlet temperature shown in the utility model patent is higher than that of the comparative test heater outlet temperature 2.5°C higher; the heater shown in the utility model patent works for 280s and stops running, and the comparative test piece works for 465s and stops running.

<Implementation Mode 2>

In the floor low-temperature radiation heating system and radiator heating mode, the heating heat source is hot water at 55°C/45°C, and the wall-hung boiler mainly uses natural gas, liquefied petroleum gas, city gas and electricity as energy sources. The utility model patent PTC The parallel flow liquid heater has high heat exchange efficiency and can replace wall-hung boilers that use electricity as energy consumption in floor low-temperature radiant heating systems (with electric heating tubes as the main method), and can achieve certain energy-saving benefits.

<Implementation Mode Three>

For instant electric water heaters, because of its excessive power (minimum power 4500W), many potential safety hazards will be caused during use. Using the PTC liquid heater of the utility model, the separation of water and electricity is really realized, and the power is relatively small (about 2200W or so), with low water flow resistance and high heat transfer efficiency, it is an ideal instant liquid heater.

Although the embodiment of the present utility model has been disclosed as above, it is not limited to the use listed in the description and the implementation, and it can be applied to various fields suitable for the present utility model. For those familiar with the art, Further modifications can be readily effected, so the invention is not limited to the specific details and examples shown and described herein without departing from the general concept defined by the claims and their equivalents.

Claims (7)

1. A PTC parallel flow heater, characterized in that, comprising: A liquid pipe, one end of which communicates with the liquid inlet; A liquid collecting pipe, one end of which communicates with the liquid outlet; n mixing tubes, for any mixing tube, it has a first opening and a second opening, n is a natural number greater than or equal to 1; n+1 heat exchange tube groups, for any heat exchange tube group, it includes a plurality of flat heat exchange tubes arranged in parallel and at intervals, the flat heat exchange tubes are provided with through holes extending along their length direction, any 2 A group of PTC heating elements is arranged between two adjacent flat heat exchange tubes, wherein, when n=1, one end of the two heat exchange tube groups communicates with the other end of the liquid distribution pipe and the liquid collection pipe respectively, and the other ends are both It communicates with the mixing tube; when n>1, one end of the first heat exchange tube group communicates with the other end of the liquid pipe, one end of the second heat exchange tube group communicates with the other end of the liquid collector, and the first heat exchange tube The other end of the group communicates with the first opening of one of the mixing tubes, the other end of the second heat exchange tube group communicates with the second opening of one of the mixing tubes, and the two ends of the remaining heat exchange tube groups communicate with the two mixing tubes respectively ; The liquid distribution pipe, the liquid collection pipe, the mixing pipe and the flat heat exchange pipe are all made of red copper. 2. The PTC parallel flow heater according to claim 1, wherein the plurality of flat heat exchange tubes are arranged at equal intervals. 3 . The PTC parallel flow heater according to claim 1 , wherein four flat through-holes are arranged in the plurality of flat heat exchange tubes along the width direction thereof. 4 . 4. The PTC parallel flow heater according to claim 1, characterized in that, n+1 heat exchange tube groups are arranged in parallel in pairs. 5 . The PTC parallel flow heater as claimed in claim 1 , wherein a set of PTC heating elements includes two PTC heating elements, and the lead wires of the two PTC heating elements are arranged facing each other inwardly. 6. The PTC parallel flow heater as claimed in claim 1, wherein the n mixing tubes are 3 mixing tubes. 7. The PTC parallel flow heater according to claim 1, characterized in that, for any heat exchange tube group, it includes 3-5 flat heat exchange tubes.