Circulating auxiliary heating device for central heating

By combining solar heating and electric heating rods in a circulating heating device, the problems of reduced hot water return temperature and wasted electricity are solved, achieving a highly efficient and energy-saving auxiliary heating effect.

CN223954257UActive Publication Date: 2026-02-27FUSHUN MINING ZHONGJI HEATING CO LTD
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Patent Information

Application Number
CN202520509997.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-03-21
Publication Date
2026-02-27
Estimated Expiration
2035-03-21

AI Technical Summary

Technical Problem

In existing centralized heating systems, the temperature drops after hot water is recirculated, affecting the auxiliary heating effect, and the energy consumption is relatively high.

Method used

The system combines a solar heating mechanism with photovoltaic panels and electric heating rods. The water is preheated and reheated through solar tubes and electric heating rods. The water flow path is controlled by an electronically controlled valve to achieve circulating heating and reduce energy consumption.

Benefits of technology

This improved the auxiliary heating efficiency of the heating pipes, reduced electricity consumption, and ensured heating quality.

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Abstract

The utility model discloses a circulating auxiliary heating device for central heating, which belongs to the technical field of central heating and comprises a heating cylinder and a heating pipe, and a solar heating mechanism is arranged on the side of the heating cylinder. According to the utility model, when hot water in the heat preservation chamber is pumped into the heating pipe through the first water pump and the water guide steel pipe to carry out auxiliary heating on heating water in the heating pipe, water subjected to heat exchange in the heating pipe is guided into the pre-storage chamber from the water return steel pipe to be temporarily stored, and backflow water is guided into the inner cavity of the heating chamber through the first electric control valve; low-temperature water is reheated through a first electric heating rod in the inner cavity of the heating chamber, and when the low-temperature water is reheated to the temperature the same as that of hot water in the inner cavity of the heat preservation chamber, the hot water in the inner cavity of the heating chamber is guided into the heat preservation chamber through a second electric control valve, so that water in a heating pipe is subjected to auxiliary heating through the hot water subsequently; and the practicability of the device is improved.
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Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of central heating, more particularly to a circulating auxiliary heating device for central heating. BACKGROUND

[0002] Heating is a basic social service to meet the basic living needs of heating in winter, and winter heating is a major event related to the livelihood of millions of households, and is an important symbol of social and economic development and improvement of people's living standards. In central heating, the heating pipe needs to deliver hot water to a long distance, which is easy to cause heat loss during transportation and affect the quality of user heating.

[0003] After searching, the utility model patent with publication number CN217785272U discloses a circulating auxiliary heating device for central heating, which comprises a heating pipe and further comprises: a heating box, the heating box is internally connected with an outlet pipe and an inlet pipe, the outlet pipe and the inlet pipe are connected with a heating pipe, the heating pipe is internally provided with a heating pipe for central heating, the heating pipe is externally sleeved with an auxiliary heating wire, and a water pump is arranged on the outlet pipe; a heating sheet, the heating box is internally provided with a support rod, the support rod is externally sleeved with a plurality of sliding blocks, the sliding blocks are provided with fixed plates on one side, and the fixed plates are provided with heating sheets between them; the heated water is pumped into the heating pipe, the heating pipe of the central heating system is assisted to heat, the heated water is discharged into the heating box through the inlet pipe, the circulating auxiliary heating of the central heating system is realized, and the heating efficiency is improved.

[0004] However, the above-mentioned patent still has the following disadvantages: after the hot water enters the heating pipe to assist the heating of the heating pipe, the temperature of the water flowing back to the heating box will decrease, which will affect the temperature of the original water in the heating box and affect the subsequent auxiliary heating of the heating pipe; in addition, it is more wasteful of electric energy to heat the auxiliary heating water by electric energy, and the cost is high. Therefore, we propose a circulating auxiliary heating device for central heating. UTILITY MODEL CONTENTS

[0005] In view of the problems in the prior art, the purpose of the utility model is to provide a circulating auxiliary heating device for central heating.

[0006] In order to solve the above problems, the utility model discloses the following technical scheme: a circulating auxiliary heating device for central heating, including heating cylinder and heating pipe, the side of heating cylinder is provided with solar heating mechanism, the inside of heating cylinder is provided with prestore room, the inside of heating cylinder is provided with heating chamber, the inside of heating cylinder is provided with heat preservation chamber, the top of heating chamber inner chamber is fixedly installed with first electric control valve, and the top of first electric control valve extends to the inner chamber of prestore room, the top of heat preservation chamber inner chamber is fixedly installed with second electric control valve, and the top of second electric control valve extends to the inner chamber of heating chamber, the bottom of heating chamber inner chamber is fixedly installed with a plurality of first electric heating rod, the inner wall of heating chamber is fixedly installed with first water level sensor, the inner wall of heating chamber is fixedly installed with first temperature sensor, the outside of heating pipe is fixedly sleeved with heating pipe, the side of heating cylinder is fixedly installed with first water pump, and the input end of first water pump extends to the bottom of heat preservation chamber inner chamber, the output end of first water pump is fixedly connected with water guide steel pipe, the top of water guide steel pipe is fixedly sleeved to the inner chamber of one end of heating pipe, the bottom of the other end of heating pipe is fixedly sleeved with backwater steel pipe, and the bottom of backwater steel pipe is fixedly sleeved to the inner chamber of prestore room.

[0007] As a preferred scheme of the utility model, the solar heating mechanism includes two support columns fixedly connected to the side of the heating cylinder, the end of the two support columns is fixedly connected with a water storage tank, the side of the water storage tank is fixedly connected with two support boxes, a plurality of solar tubes are fixedly sleeved between the two support boxes, the top of the water storage tank is fixedly sleeved with a water inlet pipe, the top of the water inlet pipe is fixedly connected with a third electric control valve, the end of the third electric control valve is fixedly sleeved to the bottom of the inner chamber of the prestore room, the bottom of the water storage tank is fixedly installed with a fourth electric control valve, the top of the fourth electric control valve extends to the inner chamber of the water storage tank, the bottom of the fourth electric control valve is fixedly connected with a water outlet pipe, the bottom of the water outlet pipe is fixedly sleeved to the top of the inner chamber of the heat preservation chamber, the inner wall of the water storage tank is fixedly installed with a third temperature sensor, and the inner wall of the water storage tank is fixedly installed with a second water level sensor.

[0008] As a preferred scheme of the utility model, the side of the heating cylinder is fixedly connected with a support frame, the top of the support frame is fixedly installed with a photovoltaic power generation panel, the bottom of the support frame is provided with a storage battery, and the bottom of the support frame is fixedly installed with a controller.

[0009] As a preferred scheme of the utility model, the bottom of the inner chamber of the heat preservation chamber is fixedly installed with a plurality of second electric heating rods, and the inner wall of the heat preservation chamber is fixedly installed with a second temperature sensor.

[0010] As one preferred scheme of the utility model, the top surface of the heating cylinder is fixedly installed with a second water pump, the output end of the second water pump extends to the inner cavity of the prestorage chamber, the input end of the second water pump is fixedly connected with a water supply pipe, the side surface of the heating cylinder is fixedly installed with a drain valve, and the end portion of the drain valve extends to the bottom of the inner cavity of the heat preservation chamber.

[0011] As one preferred scheme of the utility model, the outer side of the water guide steel pipe is sleeved with heat preservation cotton.

[0012] Compared with the prior art, the utility model has the advantages that when the hot water in the heat preservation chamber is pumped to the heating pipe through the first water pump and the water guide steel pipe to assist in heating the heating water in the heating pipe, the heat-exchanged water in the heating pipe is guided into the prestorage chamber for temporary storage, so that the influence of the backflow low-temperature water on the auxiliary heating hot water is avoided, in addition, the backflow water is guided into the inner cavity of the heating chamber through the first electric control valve, the first electric heating rod in the inner cavity of the heating chamber is utilized to reheat the low-temperature water, when the low-temperature water is re-heated to the same temperature as the hot water in the inner cavity of the heat preservation chamber, the second electric control valve is utilized to guide the hot water in the inner cavity of the heating chamber into the heat preservation chamber, so that the hot water is utilized to assist in heating the water in the heating pipe subsequently, and the effect of assisting in heating the heating pipe is ensured.

[0013] In the utility model, the backflow water in the inner cavity of the prestorage chamber can be guided into the water storage tank, the supporting box and the solar pipe through the water inlet pipe and the third electric control valve, solar energy is converted into heat energy by the solar pipe, the water is heated by the heat energy, the water temperature in the water storage tank is detected by the third temperature sensor, and the heated hot water is guided into the heat preservation chamber through the fourth electric control valve and the water outlet pipe, so that the heating pipe is assisted in heating subsequently, and the electric energy consumption for heating the water is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the whole structure schematic view of the front of the utility model;

[0015] Figure 2 It is the whole structure schematic view of the back of the utility model;

[0016] Figure 3 It is the whole cross section schematic view of the utility model;

[0017] Figure 4 It is the cross section schematic view of the water storage tank of the utility model.

[0018] Explanation of reference numerals in the drawing:

[0019] 1, heating cylinder; 2, solar heating mechanism; 3, pre-storage chamber; 4, heating chamber; 5, heat preservation chamber; 6, second electric heating rod; 7, first electric heating rod; 8, first water level sensor; 9, first temperature sensor; 10, first electric control valve; 11, second electric control valve; 12, first water pump; 13, water guide steel pipe; 14, heating pipe; 15, backwater steel pipe; 16, heating pipe; 17, support column; 18, water storage tank; 19, support box; 20, solar tube; 21, water inlet pipe; 22, third electric control valve; 23, fourth electric control valve; 24, water outlet pipe; 25, second water level sensor; 26, third temperature sensor; 27, support frame; 28, photovoltaic power generation panel; 29, battery; 30, controller; 31, heat preservation cotton; 32, drain valve; 33, second water pump; 34, water supply pipe; 35, second temperature sensor. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0021] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "sleeved / connected", "connected" and the like should be broadly understood, for example, "connected" can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. Embodiment 1

[0023] Please refer to Figures 1-4The utility model provides a circulating auxiliary heating device for central heating, including heating cylinder 1 and heating pipe 16, the side of heating cylinder 1 is provided with solar heating mechanism 2, the inside of heating cylinder 1 is provided with prestore room 3, the inside of heating cylinder 1 is provided with heating chamber 4, the inside of heating cylinder 1 is provided with heat preservation room 5, the top of heating chamber 4 inner chamber is fixedly installed with first electric control valve 10, and the top of first electric control valve 10 extends to the inner chamber of prestore room 3, the top of heat preservation room 5 inner chamber is fixedly installed with second electric control valve 11, and the top of second electric control valve 11 extends to the inner chamber of heating chamber 4, and the bottom of heating chamber 4 inner chamber is fixedly installed with a plurality of first electric heating rod 7, and the inner wall of heating chamber 4 is fixedly installed with first water level sensor 8, and the inner wall of heating chamber 4 is fixedly installed with first temperature sensor 9, and the outside of heating pipe 16 is fixedly sleeved with heating pipe 14, and the side of heating cylinder 1 is fixedly installed with first water pump 12, and the input end of first water pump 12 extends to the bottom of heat preservation room 5 inner chamber, and the output end of first water pump 12 is fixedly connected with water guide steel pipe 13, and the top of water guide steel pipe 13 is fixedly sleeved to the inner chamber of one end of heating pipe 14, and the bottom of the other end of heating pipe 14 is fixedly sleeved with backwater steel pipe 15, and the bottom of backwater steel pipe 15 is fixedly sleeved to the inner chamber of prestore room 3.

[0024] In the embodiment, the first electric heating rod 7 is used to heat the water in the heating chamber 4, and the first temperature sensor 9 is used to detect the temperature of the water in the heating chamber 4. In addition, the size of the inner chamber of the heating chamber 4 is smaller than the size of the inner chambers of the prestore room 3 and the heat preservation room 5, so that the prestore room 3 and the heat preservation room 5 can store water.

[0025] Specifically, please refer to Figure 1 , Figure 2 and Figure 4 , the solar heating mechanism 2 includes two support columns 17 fixedly connected to the side of the heating cylinder 1, two support columns 17 end fixedly connected with water storage tank 18, the side of water storage tank 18 is fixedly connected with two support boxes 19, two support boxes 19 between fixedly sleeved with a plurality of solar tubes 20, the top surface of water storage tank 18 is fixedly sleeved with water inlet pipe 21, the top of water inlet pipe 21 is fixedly connected with third electric control valve 22, the end of third electric control valve 22 is fixedly sleeved to the bottom of the inner chamber of prestore room 3, the bottom surface of water storage tank 18 is fixedly installed with fourth electric control valve 23, the top of fourth electric control valve 23 extends to the inner chamber of water storage tank 18, the bottom of fourth electric control valve 23 is fixedly connected with water outlet pipe 24, the bottom of water outlet pipe 24 is fixedly sleeved to the top of the inner chamber of heat preservation room 5, the inner wall of water storage tank 18 is fixedly installed with third temperature sensor 26, and the inner wall of water storage tank 18 is fixedly installed with second water level sensor 25.

[0026] In the embodiment, the second water level sensor 25 is used to detect the water level in the water storage tank 18, the support tank 19 and the solar tube 20, the solar tube 20 is used to convert solar energy into heat energy, the heat energy is used to heat the water in the water storage tank 18, the support tank 19 and the solar tube 20, and the third temperature sensor 26 is used to detect the temperature of the heated water.

[0027] Specifically, please refer to Figure 1 and Figure 2 The side of the heating cylinder 1 is fixedly connected with a support frame 27, the top surface of the support frame 27 is fixedly installed with a photovoltaic power generation panel 28, the bottom surface of the support frame 27 is provided with a storage battery 29, and the bottom surface of the support frame 27 is fixedly installed with a controller 30.

[0028] In the embodiment, the photovoltaic power generation panel 28 is used to convert solar energy into electrical energy and store it in the storage battery 29, the storage battery 29 is used to supply power to the device, and the controller 30 is used to control the device.

[0029] Specifically, please refer to Figure 3 A plurality of second electric heating rods 6 are fixedly installed at the bottom of the inner cavity of the heat preservation chamber 5, and a second temperature sensor 35 is fixedly installed on the inner wall of the heat preservation chamber 5.

[0030] In the embodiment, the second electric heating rods 6 are used to heat and preserve the water in the inner cavity of the heat preservation chamber 5, so that the water in the heat preservation chamber 5 is at a constant temperature, and the second temperature sensor 35 is used to detect the temperature of the water in the inner cavity of the heat preservation chamber 5.

[0031] Specifically, please refer to Figure 2 and Figure 3 A second water pump 33 is fixedly installed on the top surface of the heating cylinder 1, the output end of the second water pump 33 extends to the inner cavity of the pre-storage chamber 3, the input end of the second water pump 33 is fixedly connected with a water supply pipe 34, a drain valve 32 is fixedly installed on the side of the heating cylinder 1, and the end of the drain valve 32 extends to the bottom of the inner cavity of the heat preservation chamber 5.

[0032] In the embodiment, the end of the water supply pipe 34 is connected with an external water source, so that water is added to the heating cylinder 1 through the second water pump 33 and the water supply pipe 34, and the water in the heat preservation chamber 5 is discharged through the drain valve 32, so that the heat exchange water is replaced.

[0033] Specifically, please refer to Figure 1 The outer side of the water guide steel pipe 13 is sleeved with heat preservation cotton 31.

[0034] In the embodiment, the heat preservation cotton 31 is used to preserve the heat of the hot water in the water guide steel pipe 13, so as to avoid heat loss.

[0035] Working principle: in use, first open the first electric control valve 10, the second electric control valve 11 and the third electric control valve 22, start the second water pump 33 so that the water supply pipe 34 water in the external water source is pumped to the inner cavity of the pre storage room 3, and through the first electric control valve 10, the second electric control valve 11 and the third electric control valve 22, water is injected into the heating chamber 4, the heat preservation chamber 5 and the inner cavity of the water storage tank 18, so that the inner cavity of the heating chamber 4, the heat preservation chamber 5 and the water storage tank 18 is filled with cold water, at this time, close the second water pump 33, and close the first electric control valve 10, the second electric control valve 11 and the third electric control valve 22, then power on the first electric heating rod 7 and the second electric heating rod 6 respectively, heat the cold water in the heat preservation chamber 5 and the heating chamber 4 through the second electric heating rod 6 and the first electric heating rod 7, at the same time, detect the water temperature in the inner cavity of the heat preservation chamber 5 and the heating chamber 4 by using the second temperature sensor 35 and the first temperature sensor 9, at the same time, convert the external solar energy into heat energy by using the solar tube 20, heat the cold water in the water storage tank 18, the support tank 19 and the solar tube 20 by using the heat energy, and detect the water temperature in the inner cavity of the water storage tank 18 by using the third temperature sensor 26, then when the second temperature sensor 35 detects that the water temperature reaches the predetermined auxiliary heating temperature, start the first water pump 12 to guide the hot water in the heat preservation chamber 5 from the water guide steel pipe 13 into the inner cavity of the heating pipe 14, heat the heating water in the heating pipe 16 by using the hot water in the inner cavity of the heating pipe 14, and make the hot water in the heating pipe 14 flow back to the inner cavity of the pre storage room 3 for storage from the backwater steel pipe 15, in addition, when the first temperature sensor 9 detects that the water temperature in the inner cavity of the heating chamber 4 and the water temperature in the inner cavity of the heat preservation chamber 5 are the same, the controller 30 controls the second electric control valve 11 to open for a predetermined time, so that the water in the inner cavity of the heating chamber 4 enters the inner cavity of the heat preservation chamber 5, when the hot water in the inner cavity of the heating chamber 4 is completely discharged, close the second electric control valve 11, use the controller 30 to control the first electric control valve 10 to open, so that the backflow water in the pre storage room 3 enters the inner cavity of the heating chamber 4, when the first water level sensor 8 detects that the water in the inner cavity of the heating chamber 4 reaches a certain height, use the controller 30 to control the first electric control valve 10 to close, reheat the backflow water by the first electric heating rod 7 in the inner cavity of the heating chamber 4, so that the water in the heating chamber 4 is heated again to the same temperature as the water in the heat preservation chamber 5 and is introduced into the inner cavity of the heat preservation chamber 5, finally, when the second water level sensor 25 detects that the water temperature in the inner cavity of the water storage tank 18 and the water temperature in the inner cavity of the heat preservation chamber 5 are the same, use the controller 30 to control the fourth electric control valve 23 to open for a predetermined time, so that the water in the water storage tank 18, the support tank 19 and the solar tube 20 is guided from the fourth electric control valve 23 and the water outlet pipe 24 into the inner cavity of the heat preservation chamber 5, and then close the fourth electric control valve 23 and open the third electric control valve 22, so that the water in the inner cavity of the pre storage room 3 is guided from the third electric control valve 22 and the water inlet pipe 21 into the inner cavity of the water storage tank 18, when the second water level sensor 25 detects that the water level in the inner cavity of the water storage tank 18 reaches a predetermined height, use the controller 30 to control the third electric control valve 22 to close, heat the water by using solar energy again, and it is finished.

[0036] The above merely describes a preferred embodiment of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art, according to the technical scheme and improvement concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A circulating auxiliary heating device for central heating, comprising a heating cylinder (1) and a heating pipe (16), characterized in that: The side of the heating cylinder (1) is provided with a solar heating mechanism (2), the inside of the heating cylinder (1) is provided with a pre-storage chamber (3), the inside of the heating cylinder (1) is provided with a heating chamber (4), the inside of the heating cylinder (1) is provided with a heat preservation chamber (5), the top of the inner cavity of the heating chamber (4) is fixedly installed with a first electric control valve (10), the top end of the first electric control valve (10) extends to the inner cavity of the pre-storage chamber (3), the top of the inner cavity of the heat preservation chamber (5) is fixedly installed with a second electric control valve (11), the top end of the second electric control valve (11) extends to the inner cavity of the heating chamber (4), the bottom of the inner cavity of the heating chamber (4) is fixedly installed with a plurality of first electric heating rods (7), the inner wall of the heating chamber (4) is fixedly installed with a first water level sensor (8), the inner wall of the heating chamber (4) is fixedly installed with a first temperature sensor (9), the outer side of the heating pipe (16) is fixedly sleeved with a heating pipe (14), the side of the heating cylinder (1) is fixedly installed with a first water pump (12), the input end of the first water pump (12) extends to the bottom of the inner cavity of the heat preservation chamber (5), the output end of the first water pump (12) is fixedly connected with a water guide steel pipe (13), the top end of the water guide steel pipe (13) is fixedly sleeved to the inner cavity of one end of the heating pipe (14), the bottom of the other end of the heating pipe (14) is fixedly sleeved with a backwater steel pipe (15), and the bottom end of the backwater steel pipe (15) is fixedly sleeved to the inner cavity of the pre-storage chamber (3).

2. A circulating auxiliary heating device for central heating according to claim 1, characterized in that: The solar heating mechanism (2) comprises two support columns (17) fixedly connected to the side of the heating cylinder (1), the ends of the two support columns (17) are fixedly connected with a water storage tank (18), the side of the water storage tank (18) is fixedly connected with two support boxes (19), a plurality of solar energy pipes (20) are fixedly sleeved between the two support boxes (19), the top surface of the water storage tank (18) is fixedly sleeved with a water inlet pipe (21), the top end of the water inlet pipe (21) is fixedly connected with a third electric control valve (22), the end of the third electric control valve (22) is fixedly sleeved to the bottom of the inner cavity of the pre-storage chamber (3), the bottom surface of the water storage tank (18) is fixedly installed with a fourth electric control valve (23), the top end of the fourth electric control valve (23) extends to the inner cavity of the water storage tank (18), the bottom end of the fourth electric control valve (23) is fixedly connected with a water outlet pipe (24), and the bottom end of the water outlet pipe (24) is fixedly sleeved to the top of the inner cavity of the heat preservation chamber (5). The inner wall of the water storage tank (18) is fixedly installed with a third temperature sensor (26), and the inner wall of the water storage tank (18) is fixedly installed with a second water level sensor (25).

3. The circulating auxiliary heating device for central heating according to claim 1, characterized in that: The side of the heating cylinder (1) is fixedly connected with a support frame (27), the top surface of the support frame (27) is fixedly installed with a photovoltaic power generation panel (28), the bottom surface of the support frame (27) is provided with a storage battery (29), and the bottom surface of the support frame (27) is fixedly installed with a controller (30).

4. The circulating auxiliary heating device for central heating according to claim 1, characterized in that: A plurality of second electric heating rods (6) are fixedly installed at the bottom of the inner cavity of the heat preservation chamber (5), and a second temperature sensor (35) is fixedly installed on the inner wall of the heat preservation chamber (5).

5. The circulating auxiliary heating device for central heating according to claim 1, characterized in that: A second water pump (33) is fixedly installed on the top surface of the heating cylinder (1), the output end of the second water pump (33) extends to the inner cavity of the pre-storage chamber (3), a water supply pipe (34) is fixedly connected to the input end of the second water pump (33), a drain valve (32) is fixedly installed on the side surface of the heating cylinder (1), and the end portion of the drain valve (32) extends to the bottom of the inner cavity of the heat preservation chamber (5).

6. The circulating auxiliary heating device for central heating according to claim 1, characterized in that: The outer side of the water guide steel pipe (13) is sleeved with heat preservation cotton (31).

Citation Information

Patent Citations

  • Circulating auxiliary heating device based on central heating

    CN217785272U