CN210832580U - Phase-change temperature-controlled vacuum tube explosion-proof water heater - Google Patents

Abstract

The utility model relates to a vacuum tube explosion-proof and synergistic water heater with phase-change temperature control. A light-concentrating plate is fastened on a phase-change heat storage shell by means of reinforcing ribs, and the phase-change heat-storage shell is filled with stepped phase-change materials, which is located in the step-change heat storage shell. An insulating water tank is arranged at the lower part of the material, and the cold water preheating pipe passes through the stepped phase change material to the insulating water tank; the insulating water tank is composed of a preheating water collecting tank and a hot water collecting tank, and the middle is separated by a cold and hot partition; one end of the vacuum glass tube is connected to the preheating water tank. The other end of the hot water collection tank is connected to the hot water collection tank. After the preheated water is heated by the glass vacuum tube, the density of the hot water decreases, and the hot water rises along the lower part of the vacuum glass tube into the hot water collection tank, and the hot water is output through the hot water outlet. It can effectively solve the problems of tube burst and low heat collection efficiency caused by the uneven temperature of the inlet and outlet cold and hot water in the case of sun exposure, and can significantly reduce the temperature difference between the inlet water and the high temperature inner wall of the vacuum tube, and significantly improve the solar energy. The absorption efficiency has reached the effect of instant hot water.

Description

Phase-change temperature-controlled vacuum tube explosion-proof water heater

technical field

The utility model relates to a vacuum tube explosion-proof and efficiency-enhancing water heater, in particular to a vacuum-tube explosion-proof and efficiency-enhancing water heater with phase change temperature control.

Background technique

Although solar energy has many advantages such as inexhaustible inexhaustible supply, it also has shortcomings such as low energy density and inability to continuously supply energy. Therefore, in order to efficiently use the sufficient solar energy during the day for use at night or on cloudy days, or to use the solar energy in summer for heating in winter (seasonal heat storage), it is necessary to ensure that the solar water heater operates efficiently and safely. Therefore, preventing the vacuum tube of the water heater from bursting and improving the heat collection efficiency of the vacuum tube are urgent problems to be solved at this stage.

At present, the collector tube forms of household solar water heaters include vacuum glass tube type, heat pipe type vacuum tube, U-shaped tube type vacuum tube, etc. The vacuum glass tube type collector tube is widely used due to its high heat utilization efficiency, simple manufacturing and long service life. become the mainstream option at this stage. However, because the working process is exposed to the high temperature environment, it is easy to cause problems such as the explosion of the vacuum tube under the condition of water shortage, and the normal heat collection efficiency of the vacuum tube cannot be guaranteed, and there is even a serious safety risk.

Because the traditional method of preventing bursting of vacuum tube water heaters is mainly by arranging several stepped phase change materials around the heat collecting tube, this can reduce the temperature difference between cold and hot water to a certain extent, but it inevitably brings about the large area of the heat collecting tube and the storage capacity of the heat collecting tube. Disadvantages such as low heat and inability to efficiently utilize sufficient solar energy during the day. At the same time, there is also the practice of making heat pipe type heat collectors by using organic working fluid circulation, but this will reduce the selection space of circulating working fluid to a certain extent, increase the cost of circulating working fluid, and significantly reduce the application scope of heat collectors.

Chinese Patent Publication No. CN206310757U discloses a solar water heater that realizes thermal insulation and explosion-proofing. The solar water heater adopts a motor-driven rotatable reflector for explosion-proofing in the absence of water. Although the explosion of the collector tube can be alleviated to a certain extent. However, an additional high-power motor is required to drive the entire reflector, and the stability of the system is low, and under strong light irradiation, due to the high temperature of the inlet and outlet water, this method still has the risk of the vacuum tube bursting. In addition, Chinese Patent Publication No. CN108332436A also discloses a phase-change auxiliary heating trough solar water heater heat collection system, which can increase solar energy utilization efficiency and improve heating speed and working medium heating by designing auxiliary heat collecting devices and main heat collecting devices. The upper temperature limit of the water heater, but the selection of a specific circulating fluid in this method will narrow the working temperature range of the water heater. In the sunny winter when the temperature is low, it will basically stop working, and the equipment has a complex structure and low stability, which is not conducive to large-scale popularization and use.

SUMMARY OF THE INVENTION

The technical problem to be solved by the utility model is that when the vacuum tube of the solar water heater works in a high temperature environment, it is prone to burst and the heat collection efficiency is low. When exposed to the sun, suddenly adding cold water to the vacuum tube leads to the problem of tube bursting, which significantly improves the heat storage effect of the solar water heater, and at the same time achieves the effect of instant use without adding an auxiliary heating device.

The purpose of the present utility model is achieved through the following technical solutions:

A phase-change temperature-controlled vacuum tube explosion-proof and synergistic water heater, comprising a concentrating plate, a phase-change heat storage shell, a cold-water preheating pipe, a stepped phase-change material, a heat-insulating water tank, a heat-insulating layer, a hot-water outlet, a hot-cold partition, a vacuum Glass tubes and headers, the concentrating plate is fixedly connected to the phase change heat storage shell through reinforcing ribs, the phase change heat storage shell is filled with stepped phase change material, and a heat preservation water tank is arranged at the lower part of the stepped phase change material. The cold water preheating pipe passes through the stepped phase change material into the heat preservation water tank; the heat preservation water tank is composed of a preheating water collection tank and a hot water collection tank, the heat preservation water tank is wrapped with a heat insulation layer outside, and the middle is embedded through a cold and hot baffle. The heat insulation layer separates the preheating water collection tank and the hot water collection tank; the upper left side of the insulation water tank is provided with a pressure balance valve for controlling the pressure of the incoming and outgoing water, the lower part of the phase change heat storage shell is connected to the header, and the header is installed A vacuum glass tube, one end of the vacuum glass tube is connected to a preheating water collection tank, and the other end is connected to a hot water collection tank, and a hot water outlet is provided on the side of the hot water collection tank; after the preheated water is heated by the glass vacuum tube, the density of the hot water Lower, rise along the lower part of the vacuum glass tube to the hot water collecting tank, and output the hot water through the hot water outlet.

Further, the phase-change temperature-controlled vacuum tube explosion-proof and synergistic water heater is fixed on the ground through a bracket.

Further, the concentrating plate focuses the solar energy at the focal line of the phase-change heat storage shell, and the focal line of the concentrating plate is parallel to the axis of the cold water preheating pipe.

Further, the interior of the phase change heat storage shell is filled with stepped phase change materials in turn according to the heating direction, wherein the temperature range of the first type of phase change material is 40°C to 70°C, and the temperature range of the second type of phase change material is 70°C. ℃～100℃.

Further, the phase-change heat storage shell is made of a high thermal conductivity alloy, and the condensing radian angle of the concentrating plate is π/3˜2π/3.

Further, the heat preservation water tank and the phase change energy storage shell are arranged coaxially.

The beneficial effects of the present utility model are:

(1) Compared with the existing all-glass vacuum tube, the cold water preheating tube is wrapped with the step phase change material, the water temperature of the cold water entering the vacuum tube is significantly increased, and the tube bursting phenomenon caused by the uneven cooling and heating of the inlet and outlet of the vacuum tube can be avoided.

(2) The concentrating design radian angle of the concentrating plate is π/3～2π/3, so that all the heat energy absorbed by the stepped phase change material comes from the solar energy, and the cold water is used to preheat and heat up, and the solar energy is efficiently utilized, which improves the heat collection efficiency of the vacuum tube.

(3) The cold and hot water are collected into the preheated water collection tank and the hot water collection tank to speed up the heating rate of cold water, which can ensure sufficient hot water in the insulation water tank, and can achieve instant opening without adding auxiliary electric heating device Ready-to-use effects.

In general, the utility model can effectively solve the problems such as tube bursting and low heat collection efficiency caused by the uneven temperature of the inlet and outlet water and the temperature of the inner wall of the glass vacuum tube under the condition of sun exposure. Simple, energy saving and environmental protection, strong practicability.

Description of drawings

Fig. 1 is the front view of the structure of the vacuum tube explosion-proof and synergistic water heater with phase change temperature control of the present invention;

Fig. 2 is the left side view of the structure of the vacuum tube explosion-proof and synergistic water heater with phase change temperature control of the present invention;

In the figure: Concentrator 1, Phase Change Heat Storage Shell 2, Cold Water Preheating Tube 3, Step Phase Change Material 4, Insulation Water Tank 5, Insulation Layer 6, Hot Water Outlet 7, Hot and Cold Separator 8, Vacuum Glass Tube 9 , Header 10 , preheated water collection tank 11 , hot water collection tank 12 , reinforcement rib 13 , pressure balance valve 14 , bracket 15 .

Detailed ways

The present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

A vacuum tube explosion-proof and synergistic water heater with phase change temperature control, as shown in Figure 1, its structure includes a condensing plate 1, a phase change heat storage shell 2, a cold water preheating pipe 3, a stepped phase change material 4, a thermal insulation water tank 5, a partition Thermal layer 6 , hot water outlet 7 , hot and cold partition 8 , vacuum glass tube 9 , header 10 , preheated water collection tank 11 , hot water collection tank 12 , bracket 15 . The concentrating plate 1 is fixedly connected to the phase change heat storage shell 2 through the reinforcing ribs 13. The phase change heat storage shell 2 is filled with the step phase change material 4, and the cold water preheating pipe 3 passes through the step phase change material 4 to the insulation water tank 5. . The tap water absorbs heat after entering the cold water preheating pipe 3 to increase the water temperature. The preheated water collecting tank 11 and the hot water collecting tank 12 constitute the thermal insulation water tank 5 , and the thermal insulation water tank 5 is wrapped with an insulating layer 6 to avoid heat exchange between the step phase change material 4 and the thermal insulation water tank 5 . The heat preservation water tank 5 is arranged coaxially with the phase change energy storage shell 2, and is located at the lower part of the stepped phase change material 4. The hot and cold baffle 8 is embedded in the heat insulation layer 6 in the middle to separate the preheating water collecting tank 11 and the hot water collecting tank 12. The pressure balance valve 14 is located on the upper left side of the heat preservation water tank 5 and is used to control the inlet and outlet water pressures. The header 10 is connected to the lower part of the phase change heat storage shell 2 , and a vacuum glass tube 9 is installed on the header 10 . The hot water header tank 12 is provided with a hot water outlet 7 . The main body of the water heater is fixed on the ground by the bracket 15. After the preheated water in the preheating water collecting tank 11 is heated by the glass vacuum tube 9, the density of the hot water decreases, and then rises along the lower header 10 of the vacuum tube to the hot water collecting tank 12, and passes through the hot water outlet 7. The hot water output reaches the user end. The phase change heat storage shell is made of high thermal conductivity alloy. The interior of the phase change heat storage shell 2 is filled with stepped phase change materials in sequence according to the heating direction, wherein the temperature range of the first type of phase change material is 40°C to 70°C, and the temperature range of the second type of phase change material is 70°C to 100°C. °C.

As shown in FIG. 2 , the concentrating plate 1 is fixed on the phase-change heat storage shell 2 by the reinforcing ribs 13, and the concentrating plate 1 is designed to have a certain radian (the condensing radian angle of the concentrating plate 1 is π/3～2π/3), so that At the focal line of the phase change heat storage shell 2, the focal line of the concentrating plate is parallel to the axis of the cold water preheating tube 3, and the phase change heat storage shell 2 is made of high thermal conductivity alloy to ensure that the condensed heat transmits the phase change as much as possible The material is used to preheat the cold water in the inlet pipe. The pressure balance valve 14 is located at the outer end of the phase change heat storage shell 2 and is used to control the pressure of the inlet and outlet cold and hot water.

Working principle: The main body of the solar water heater is composed of a concentrating part, a cold water preheating part and a heating water storage part. When the solar water heater works under the sunlight, the concentrators focus the sunlight evenly on the focal line of the phase change heat storage shell, and the tap water enters the thermal insulation water tank through the cold water preheating pipe coated with the stepped phase change material, and the cold water absorbs the solar energy. The heat rises rapidly, the preheated water enters the preheated water collection tank in the box, and a certain thickness of heat insulation layer is arranged around the insulation water tank to avoid heat exchange between the phase change material and the preheated water collection tank and the hot water collection tank. The preheated cold water is separated from the high temperature hot water by the hot and cold partitions inside the box. After the preheated water is heated by the vacuum tube, it circulates back to the hot water collection tank due to the low density of the hot water, and is transported to the hot water collection tank through the hot water outlet along the insulation pipeline. Domestic water.

Claims (6)

1. The utility model provides an explosion-proof synergistic water heater of vacuum tube of phase transition accuse temperature, includes solar panel, phase transition heat-retaining shell, cold water preheating tube, step phase change material, holding water box, insulating layer, hot water outlet, cold and hot baffle, vacuum glass pipe, header, its characterized in that: the solar panel is fixedly connected to the phase change heat storage shell through a reinforcing rib, the phase change heat storage shell is filled with a step phase change material, a heat preservation water tank is arranged on the lower portion of the step phase change material, and the cold water preheating pipe penetrates through the step phase change material to be arranged in the heat preservation water tank; the heat preservation water tank consists of a preheated water collection tank and a hot water collection tank, a heat insulation layer is wrapped outside the heat preservation water tank, and the preheated water collection tank and the hot water collection tank are separated through a cold and hot partition plate in the middle; the left upper side of the heat preservation water tank is provided with a pressure balance valve for controlling the pressure of inlet and outlet water, the lower part of the phase change heat storage shell is connected with a header, a vacuum glass tube is arranged on the header, one end of the vacuum glass tube is communicated with a preheated water collection tank, the other end of the vacuum glass tube is communicated with a hot water collection tank, and the side surface of the hot water collection tank is provided with a hot water outlet; after the preheated water is heated by the glass vacuum tube, the density of the hot water is reduced, the preheated water rises along the lower part of the vacuum glass tube to the hot water collecting box, and the hot water is output through the hot water outlet.

2. The phase-change temperature-control vacuum tube explosion-proof synergistic water heater as claimed in claim 1, characterized in that: the phase-change temperature-control explosion-proof synergistic water heater with the vacuum tube is fixed on the ground through a support.

3. The phase-change temperature-control vacuum tube explosion-proof synergistic water heater as claimed in claim 1, characterized in that: the solar energy is focused on the focal line of the phase-change heat storage shell by the light-gathering plate, and the focal line of the light-gathering plate is parallel to the axis of the cold water preheating pipe.

4. The phase-change temperature-control vacuum tube explosion-proof synergistic water heater as claimed in claim 1, characterized in that: the interior of the phase change heat storage shell is sequentially filled with step phase change materials according to the heating direction, wherein the temperature range of the first phase change material is 40-70 ℃, and the temperature range of the second phase change material is 70-100 ℃.

5. The phase-change temperature-control vacuum tube explosion-proof synergistic water heater as claimed in claim 1, characterized in that: the phase-change heat storage shell is made of high-heat-conductivity alloy, and the light-gathering arc angle of the light-gathering plate is pi/3-2 pi/3.

6. The phase-change temperature-control vacuum tube explosion-proof synergistic water heater as claimed in claim 1, characterized in that: the heat preservation water tank and the phase change energy storage shell are coaxially arranged.

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