A boiler heating system with return water heating function

Abstract

This invention discloses a boiler heating system with a return water heating function, relating to the field of boiler technology. The boiler heating system includes a boiler body, a steam chamber at the top of the boiler body, a circulating heating pipeline on one side of the steam chamber, a filter assembly, an expansion tank, and a thermostatic assembly on the circulating heating pipeline. The expansion tank includes a tank body and an expansion bag. The fixed end of the expansion bag is located on one side of the tank body, and the movable end of the expansion bag is provided with a stretching assembly. The fixed part of the stretching assembly is located on the other side of the tank body. A heat insulation plate is provided at the bottom of the tank body. This invention uses the contraction of the stretching assembly to stretch and deform the expansion bag, increasing the heat exchange area between the expansion bag and the hot steam in the tank body. The high-frequency reciprocating movement of the stretching assembly's extension and retraction end disturbs the water in the expansion bag, accelerating the heat exchange between the hot steam and the return water in the expansion bag, reducing the heat exchange time of the low-temperature return water in the steam chamber, and improving the efficiency of circulating heating.

Description

Technical Field

[0001] This invention relates to the field of boiler technology, specifically to a boiler heating system with a return water heating function. Background Technology

[0002] A boiler is an energy conversion device. By inputting energy into the boiler, it outputs steam or high-temperature water with thermal energy. Boilers are widely used in industrial production and people's daily lives.

[0003] Boilers generate enormous heat during operation, forming a large amount of steam within them. Heating systems for users utilize this steam to meet their heating needs. Chinese Patent CN113124450A discloses a boiler heating system with a high-temperature hot water boiler return water heating function. This system includes a boiler, a variable frequency pump unit, an outlet pipe, and a return pipe, further comprising a return water heating pipe. The outlet of the variable frequency pump unit is connected to the boiler inlet via a connecting pipe. The return pipe is connected to the inlet of the variable frequency pump unit, and the outlet pipe is connected to the boiler outlet. Both ends of the return water heating pipe are equipped with T-joints. However, before the water in the outlet pipe and its contents, heated by the boiler, is supplied to the heating pipes, the lack of heat collection and utilization functions leads to heat loss from the outlet pipe. This results in the temperature of the water supplied to the heating pipes being lower than the preset standard, increasing fuel consumption.

[0004] In addition, during the use of the expansion tank in the boiler heating system, condensation will form on the surface of the elastic bag inside the tank due to the temperature difference between the inside and outside. The accumulation of condensation in the tank is not conducive to the rise of the water temperature in the bag, which affects the heating efficiency of the heating unit. At the same time, when the ambient temperature is high, if the heating temperature is also maintained at a high temperature, the lack of heating temperature regulation function will lead to excessively high indoor temperature in the heating unit, causing discomfort to the human body.

[0005] Therefore, a boiler heating system with a return water heating function is proposed to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to disclose a boiler heating system with a return water heating function to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution: a boiler heating system with a return water heating function, comprising a boiler body, a steam chamber at the top of the boiler body, a circulating heating pipeline on one side of the steam chamber, and a filter assembly, an expansion tank and a constant temperature assembly on the circulating heating pipeline;

[0008] The expansion tank includes a tank body and an expansion bag. The fixed end of the expansion bag is located on one side of the tank body, and the movable end of the expansion bag is provided with a tensioning component. The fixed part of the tensioning component is located on the other side of the tank body.

[0009] The bottom of the box is provided with a heat insulation plate, the top of the heat insulation plate is provided with a water collection port, the bottom of the heat insulation plate is provided with a water storage bag, the top of the water storage bag is provided with a water storage head, the bottom of the heat insulation plate is provided with a pressure plate, and the pressure plate is magnetically connected to the movable end of the expansion bag.

[0010] The constant temperature component includes an air outlet connector and an outer sleeve. One end of the outer sleeve is connected to the housing via an air supply pipe. The housing is connected to the steam chamber via a return air pipe, and a steam pump is installed on the return air pipe.

[0011] Optionally, the circulating heating pipeline includes an outlet pipe, a first return water pipe and a second return water pipe. One end of the outlet pipe is connected to a heating pipe, and one end of the heating pipe is connected to the first return water pipe. The filter assembly is installed on the first return water pipe, and the expansion tank is installed between the first return water pipe and the second return water pipe.

[0012] The first return water pipe has one end that passes through the expansion tank and is connected to the expansion bag. The second return water pipe has one end that passes through the expansion tank and is connected to the expansion bag. The end of the second return water pipe that passes through the expansion tank is a flexible hose.

[0013] Optionally, the steam chamber is equipped with a heat exchange tube, the end of the liquid outlet pipe away from the heating pipe is connected to the outlet end of the heat exchange tube, the end of the second return water pipe away from the expansion tank is connected to the inlet end of the heat exchange tube, and the second return water pipe is equipped with a variable frequency circulating pump and a control valve.

[0014] Optionally, the filter assembly includes a filter box, inside which is a filter layer arranged at an angle, and a storage box is provided on one side of the filter box, the storage box corresponding to the bottom of the filter layer.

[0015] Optionally, the filter layer includes an upper filter layer and a lower filter layer, with an elastic element, which is a spring, provided between the upper filter layer and the lower filter layer, and the filtration pore size of the lower filter layer is smaller than that of the upper filter layer.

[0016] Optionally, the storage box is made of transparent material, and a sealing connector is provided at the joint of the storage box. The storage box can be detachably installed on one side of the filter box through the sealing connector.

[0017] Optionally, the expansion bag is a corrugated expansion bag, the stretching assembly is an electric telescopic rod, and the movable part of the stretching assembly is fixedly connected to the movable end of the expansion bag;

[0018] The water inlet is located on both sides of the heat insulation plate, which has sloping sides. The heat insulation plate divides the box into an upper chamber and a lower chamber. The water storage bag is located in the lower chamber. The top of both sides of the water storage bag is provided with connecting pipes. The water storage bag is connected to the water storage head through the connecting pipes. The water storage head is matched with the water inlet.

[0019] A first magnetic block is provided on the top of one side of the pressure plate, and a second magnetic block is provided at the bottom of the movable end of the expansion bag, which corresponds to and cooperates with the first magnetic block.

[0020] The bottom of the heat insulation plate is provided with a fixing plate, and one end of the water storage bag is fixedly connected to the fixing plate.

[0021] Optionally, a limiting member is provided on the outer side of the movable end of the expansion bag;

[0022] The limiting component includes a limiting groove formed inside the box, and a limiting plate is fixedly connected to the side of the expansion bag near the second return water pipe, with the limiting plate corresponding to and cooperating with the limiting groove.

[0023] The limiting plate is rotatably connected to a ball bearing at one end located within the limiting groove.

[0024] Optionally, the outer sleeve is connected to the steam chamber via an air outlet connector, and the outer sleeve is fitted over the outside of the liquid outlet pipe and the first return water pipe.

[0025] The technical effects and advantages of this invention are as follows:

[0026] 1. In this invention, after the water temperature decreases after passing through the heating pipe, the return water is transported back to the heat exchange pipe for heating under the drive of the variable frequency circulation pump, ensuring the temperature of the water in the heating pipe. In order to reduce heat loss when the heating pipe transports high-temperature water, an outer sleeve is used to insulate the outlet pipe and the first return water pipe. At the same time, the return water is preheated in advance by using internal water vapor and the recovery of heat from the outlet pipe and the first return water pipe.

[0027] 2. This invention stretches and deforms the expansion bag by contracting the stretching component, increasing the heat exchange area between the expansion bag and the hot steam in the box, thereby increasing the heating rate of the return water. The high-frequency reciprocating movement of the stretching component's extension end disturbs the water in the expansion bag, accelerating the heat exchange between the hot steam and the return water in the expansion bag, reducing the heat exchange time of the low-temperature return water in the steam chamber, and improving the efficiency of circulating heating.

[0028] 3. The heat exchange between water vapor and low-temperature return water in this invention will continuously generate condensate on the outer surface of the expansion bag. The condensate entering the lower chamber of the insulation plate will reduce the impact on the heat absorption of the water in the expansion bag, thereby improving the heat exchange efficiency between the water in the expansion bag and the high-temperature water vapor in the box.

[0029] 4. When the heating temperature of the heating unit reaches the superheat level, the expansion bag is repeatedly compressed by the extension and contraction of the stretching end of the stretching component. The pressure plate moves synchronously with the movable end of the expansion bag under the magnetic force of the first and second magnetic blocks, thereby compressing the water storage bag. Water is continuously sprayed from the water storage bag to the expansion bag. The return water temperature is reduced by the heat exchange between the condensate and the return water in the expansion bag.

[0030] 5. In the process of compressing the expansion bag by the stretching component, the present invention increases the frequency of the horizontal back-and-forth movement of the stretching component on the moving end of the expansion bag. By utilizing the disturbance of the water body caused by the high-frequency compression of the expansion bag, the return water distribution in the expansion bag is made more uniform, thereby improving the contact heat exchange efficiency between the return water and the condensate in the middle of the expansion bag. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the boiler heating system structure of the present invention;

[0032] Figure 2 This is a schematic diagram of the circulating heating pipeline structure of the present invention;

[0033] Figure 3 This is a schematic diagram of the internal structure of the housing of the present invention;

[0034] Figure 4 This is a schematic diagram of the expansion bag connection structure of the present invention;

[0035] Figure 5 This is a schematic diagram of the heat insulation panel structure of the present invention;

[0036] Figure 6 This is a schematic diagram of the water storage bag structure of the present invention;

[0037] Figure 7 For the present invention Figure 6 A magnified schematic diagram of the structure in area A;

[0038] Figure 8 This is a schematic diagram of the internal structure of the filter box of the present invention.

[0039] In the diagram: 1. Boiler body; 2. Steam chamber; 3. Circulating heating pipeline; 301. Liquid outlet pipe; 302. First return water pipe; 303. Second return water pipe; 4. Filter assembly; 401. Filter box; 402. Filter layer; 4021. Upper filter layer; 4022. Lower filter layer; 4023. Elastic component; 403. Storage box; 5. Expansion tank; 501. Box body; 502. Expansion bag; 503. Tensioning component; 50 4. Insulation board; 5041. Water inlet; 5042. First magnetic block; 5043. Pressure plate; 5044. Fixing plate; 5045. Second magnetic block; 505. Water storage bag; 5051. Water storage head; 5052. Connecting pipe; 507. Limiting component; 5071. Limiting groove; 5072. Limiting plate; 6. Constant temperature component; 601. Air outlet connector; 602. Outer sleeve; 603. Gas supply pipe; 604. Gas return pipe. Detailed Implementation

[0040] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0041] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0042] Please see Figure 1-8 This embodiment discloses a boiler heating system with a return water heating function, including a boiler body 1, a steam chamber 2 at the top of the boiler body 1, a heat exchange tube inside the steam chamber 2, a circulating heating pipeline 3 on one side of the steam chamber 2, a filter assembly 4, an expansion tank 5 and a constant temperature assembly 6 on the circulating heating pipeline 3. The filter assembly 4 filters impurities in the circulating hot water, the expansion tank 5 absorbs the increased volume and pressure of the circulating water when the water temperature rises, and the constant temperature assembly 6 maintains the heating temperature of the circulating heating pipeline 3 for the heating pipe, thereby reducing the heat loss of the circulating heating pipeline 3.

[0043] The circulating heating pipeline 3 includes an outlet pipe 301, a first return water pipe 302, and a second return water pipe 303. The end of the outlet pipe 301 away from the heating pipe is connected to the outlet end of the heat exchange pipe. The end of the second return water pipe 303 away from the expansion tank 5 is connected to the inlet end of the heat exchange pipe. One end of the outlet pipe 301 is connected to the heating pipe. The end of the heating pipe away from the outlet pipe 301 is connected to the first return water pipe 302. The filter assembly 4 is installed on the first return water pipe 302. The expansion tank 5 is installed between the first return water pipe 302 and the second return water pipe 303.

[0044] The second return water pipe 303 is equipped with a variable frequency circulating pump and a control valve.

[0045] like Figure 2 As shown, the filter assembly 4 includes a filter box 401, inside which is a filter layer 402, which is inclined. A collection box 403 corresponding to the bottom of the filter layer 402 is provided on one side of the filter box 401. Impurities blocked by the filter layer 402 are collected by the inclined guide collection box 403. The collection box 403 is made of transparent material and is detachably installed on one side of the filter box 401. A sealing connector is provided at the joint of the collection box 403, and the collection box 403 is detachably connected to the filter box 401 through the sealing connector.

[0046] like Figure 3 As shown, the expansion tank 5 includes a tank body 501 and an expansion bag 502. The expansion bag 502 is a corrugated expansion bag. When the temperature in the expansion bag 502 rises, the expansion bag 502 extends laterally.

[0047] The end of the expansion bag 502 closest to the first return water pipe 302 is the fixed end, and the end of the expansion bag 502 opposite to the fixed end is the movable end. The fixed end of the expansion bag 502 is fixedly connected to one side of the box 501. The movable end of the expansion bag 502 is provided with a tensioning component 503, which is an electric telescopic rod. The volume of the expansion bag 502 can be adjusted by the tensioning component 503. The fixed part of the tensioning component 503 is fixedly connected to the other side of the box 501. A limiting member 507 is provided on the outside of the movable end of the expansion bag 502 to improve the stability of the expansion bag 502 when it expands and contracts.

[0048] Specifically, the limiting component 507 includes a limiting groove 5071 formed inside the housing 501. The movable end of the expansion bag 502 is fixedly connected to a limiting plate 5072. The limiting plate 5072 and the limiting groove 5071 are correspondingly engaged. One end of the limiting plate 5072 located in the limiting groove 5071 is rotatably connected to a ball bearing. The ball bearing improves the smoothness of the limiting plate 5072 when it moves horizontally along the limiting groove 5071.

[0049] The first return water pipe 302 passes through the tank body 501 at one end near the expansion tank 5 and is connected to the fixed end of the expansion bag 502. The second return water pipe 303 passes through the tank body 501 at one end near the expansion tank 5 and is connected to the expansion bag 502. The end of the second return water pipe 303 near the expansion tank 5 is a rubber hose.

[0050] The bottom inner side of the housing 501 is provided with a heat insulation plate 504, and water collection ports 5041 are opened on both sides of the heat insulation plate 504. The two sides of the heat insulation plate 504 are inclined, and the heat insulation plate 504 divides the housing 501 into an upper chamber and a lower chamber.

[0051] like Figure 2As shown, the constant temperature component 6 includes an air outlet connector 601 and an outer sleeve 602. One end of the outer sleeve 602 is provided with an air supply pipe 603, and one end of the air supply pipe 603 is connected to the housing 501. The top of the housing 501 is connected to a return air pipe 604. One end of the return air pipe 604 is fixedly connected to one side of the steam chamber 2. A steam pump is provided on the return air pipe 604. The outer sleeve 602 is sleeved on the outside of the liquid outlet pipe 301 and the first return water pipe 302. The liquid outlet pipe 301 and the first return water pipe 302 are insulated by the interlayer between the outer sleeve 602 and the liquid outlet pipe 301 and the first return water pipe 302, so as to prevent the heat in the liquid outlet pipe 301 from being lost before being supplied to the heating pipe, which would affect the heating temperature of the heating pipe.

[0052] During use, fuel is supplied to the boiler body 1 for combustion and heating. The high temperature is transferred to the water inside the boiler body 1 for heat exchange, and the water temperature rises to generate high-temperature steam. A heat exchange tube is provided on the inner top of the boiler body 1. The heat exchange tube is a circulating heat exchange tube. The two ends of the heat exchange tube are connected to the liquid outlet pipe 301 and the second return water pipe 303 respectively. Driven by the variable frequency circulating pump, the water temperature after passing through the heating pipe is greatly reduced. After the water is filtered for impurities by the filter layer 402, the water is returned to the heat exchange tube through the first return water pipe 302, the expansion bag 502 and the second return water pipe 303 in sequence to be heated. This allows the steam in the boiler body 1 to continue to exchange heat with the low-temperature water in the circulating heating pipe 3, thereby ensuring the temperature of the water in the heating pipe and improving the heating efficiency of the heating pipe.

[0053] To further improve the stability of the heating supply from the circulating heating pipeline 3 to the heating pipeline, avoid heat loss before and after the circulating heating pipeline 3 delivers high-temperature water to the heating pipeline, and reuse the heat emitted by the circulating heating pipeline 3, the high-temperature steam in the steam chamber 2 is supplied to the outer sleeve 602 through the steam outlet joint 601. The heat of the high-temperature steam in the outer sleeve 602 insulates the liquid outlet pipe 301 and the first return water pipe 302, thereby maintaining a stable heating effect on the heating pipeline. At the same time, the partial coverage of the liquid outlet pipe 301 and the first return water pipe 302 by the outer sleeve 602 can absorb the heat emitted by the liquid outlet pipe 301 and the first return water pipe 302.

[0054] Furthermore, the heat in the outer casing 602 is supplied to the housing 501 through the gas supply pipe 603. By increasing the heat in the housing 501, the low-temperature return water in the expansion bag 502 is preheated. During this process, the expansion bag 502 is stretched and deformed by the contraction of the stretching component 503, increasing the heat exchange area between the expansion bag 502 and the hot steam in the housing 501. At this time, the high-frequency reciprocating movement of the extension end of the stretching component 503 causes the movable end of the expansion bag 502 to frequently approach and move away from the fixed end of the expansion bag 502, thereby disturbing the water in the expansion bag 502, accelerating the heat exchange between the hot steam and the return water in the expansion bag 502, improving the heating efficiency of the return water in the expansion bag 502, and reducing the heat exchange time of the low-temperature return water in the steam chamber 2, thus improving the efficiency of the circulating heating.

[0055] When high-temperature water vapor in the housing 501 exchanges heat with low-temperature water in the expansion bag 502, the heat exchange between the water vapor and the low-temperature water will continuously generate condensate on the outer surface of the expansion bag 502. The inclined surface of the heat insulation plate 504 causes the condensate to collect at the water collection port 5041 and enter the lower chamber at the bottom of the heat insulation plate 504 through the water collection port 5041. This prevents the condensate from accumulating directly below the expansion bag 502 and continuously absorbing heat from the housing 501 and the expansion bag 502. The heat insulation effect of the heat insulation plate 504 reduces the impact of the condensate in the lower chamber on the heat exchange of the water in the expansion bag 502, thereby improving the heat exchange efficiency between the water in the expansion bag 502 and the high-temperature water vapor in the housing 501.

[0056] Please see Figure 1-8 As shown, boiler body 1 generally maintains a stable heating temperature for the heating units in order to ensure comfortable indoor temperatures. However, in actual use, when the ambient temperature rises, coupled with continuous indoor heating, the indoor temperature will become too high, affecting indoor air quality, increasing human discomfort, and causing continuous waste of fuel energy. To address these issues, the following embodiments are proposed:

[0057] The lower chamber is equipped with a water storage bag 505. The top of both sides of the water storage bag 505 is equipped with a connecting pipe 5052. The top of the connecting pipe 5052 is equipped with a water storage head 5051 that corresponds to the water collection port 5041. The condensate formed by the heat exchange between the hot steam in the box 501 and the low temperature water in the expansion bag 502 is collected through the inclined surface of the heat insulation plate 504 towards the water collection port 5041 and enters the water storage bag 505 through the water storage head 5051 for storage.

[0058] A fixing plate 5044 is provided at the bottom of one end of the heat insulation plate 504 near the first return water pipe 302. One end of the water storage bag 505 is fixedly connected to the fixing plate 5044, and the fixing plate 5044 provides stable support for one end of the water storage bag 505.

[0059] The lower chamber is connected to a pressure plate 5043. A first magnetic block 5042 is provided on one side of the pressure plate 5043. A second magnetic block 5045 is provided at the bottom of the end of the expansion bag 502 near the second return water pipe 303. Through the magnetic force of the first magnetic block 5042 and the second magnetic block 5045, the pressure plate 5043 moves synchronously with the movable end of the expansion bag 502.

[0060] A temperature sensor is installed on the heating pipe. The temperature sensor is located at one end of the heating pipe near the first return water pipe 302. The temperature sensor is used to detect the temperature of the water in the heating pipe. At the same time, the heating temperature in the heating pipe is regulated based on the monitoring of the ambient temperature.

[0061] During use, based on the comparison between the water temperature in the heating pipes and the ambient temperature, when the water temperature in the heating pipes is lower than the ambient temperature, the temperature of the water in the circulating heating pipes 3 is continuously maintained and maintained through the outer casing 602. Simultaneously, the steam in the steam chamber 2 continues to supply heat to the housing 501, increasing the heating temperature for the user. A temperature threshold T1 is preset on the temperature sensor. When the water temperature in the heating pipes is higher than the ambient temperature and also higher than the temperature threshold T1 set on the temperature sensor, it indicates that heating is in use. When the unit's heating temperature reaches a superheated level, the condensate generated by the heat exchange between the expansion bag 502 and the water vapor in the box 501 enters the water storage bag 505 through the water storage head 5051 and is collected. Utilizing the extension of the telescopic end of the tensioning component 503, the movable end of the expansion bag 502 moves horizontally, shortening the distance between the movable and fixed ends of the expansion bag 502, thus compressing the entire expansion bag 502. As the telescopic end of the tensioning component 503 extends, the pressure plate 5043 and the fixed plate 5044 squeeze the water storage bag 505, releasing the condensate from the water storage bag 505. Condensate is extruded upwards and sprayed onto the expansion bag 502. When the stretching assembly 503 contracts, the expansion bag 502 extends, and the water storage bag 505 extends synchronously and absorbs some of the condensate. The water storage bag 505 is equipped with a semiconductor cooling chip, the cooling end of which is located inside the water storage bag 505. The semiconductor cooling chip lowers the temperature of the condensate in the water storage bag 505. After the condensate is extruded from the water storage bag 505 and exchanges heat with the return water in the expansion bag 502, the semiconductor cooling chip maintains the condensate in the water storage bag 505 at a low temperature. (The last sentence appears to be incomplete and possibly refers to a separate event: "First magnetic block 50...") Under the magnetic force of the second magnetic block 5045, the pressure plate 5043 moves synchronously with the movable end of the expansion bag 502. The compression distance of the stretching component 503 on the expansion bag 502 increases gradually, and the compression distance of the pressure plate 5043 on the expansion bag 502 increases synchronously. During the continuous extension and contraction of the stretching component 503, the water storage bag 505 is repeatedly squeezed by the pressure plate 5043 and the fixing plate 5044. Water is continuously sprayed from the water storage bag 505 onto the expansion bag 502. The heat exchange between the condensate and the return water in the expansion bag 502 is used to reduce the temperature of the return water.

[0062] However, during the compression of the expansion bag 502 by the stretching assembly 503, the return water located in the middle of the expansion bag 502 cannot exchange heat with the condensate in time. To address this, by increasing the horizontal back-and-forth driving frequency of the stretching assembly 503 on the moving end of the expansion bag 502, the disturbance formed by the high-frequency compression of the expansion bag 502 on the water body is utilized to make the return water distribution in the expansion bag 502 more uniform, thereby improving the contact heat exchange efficiency between the return water and the condensate in the middle of the expansion bag 502.

[0063] Furthermore, during the process of filtering impurities from the water in the circulating heating pipe 3 using the filter layer 402, the filter pores of the filter layer 402 gradually become clogged with impurities, causing water flow obstruction. Because the filter layer 402 is difficult to clean, the water in the circulating heating pipe 3 cannot circulate at a normal flow rate, thus affecting the heating effect. To address this problem, the following embodiment is proposed:

[0064] A flow sensor is installed at the bottom of the filter layer 402. The flow sensor detects whether the water flowing through the filter layer 402 is smooth and determines whether the filter layer 402 is clogged.

[0065] Furthermore, the filter layer 402 includes an upper filter layer 4021 and a lower filter layer 4022. An elastic element 4023 is provided between the upper filter layer 4021 and the lower filter layer 4022. The filtration pore size of the lower filter layer 4022 is smaller than that of the upper filter layer 4021, thereby improving the filtration effect on impurities in the water.

[0066] In use, when the flow sensor detects a blockage in the filter layer 402, after the heating system stops supplying heat, a drain valve is installed on the second return water pipe 303, and a pressure relief valve is installed on the top of the filter box 401. The drain valve first completely drains the water from the heating system, then the control valve on the second return water pipe 303 closes and the pressure relief valve opens. Then, the stretching component 503 compresses the movable end of the expansion bag 502, forcing the gas in the expansion bag 502 into the filter box 401 through the first return water pipe 302. The repeated stretching and contraction of the stretching component 503 repeatedly squeezes the expansion bag 502, causing the gas in the expansion bag 502 to repeatedly impact the filter layer 402 from the bottom of the filter box 401. Under the impact of the gas, impurities in the filter pores of the filter layer 402 are removed and guided into the collection box 403 for collection along the inclined surface at the top of the filter layer 402.

[0067] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A boiler heating system with a return water heating function, comprising a boiler body (1), wherein a steam chamber (2) is provided on the top of the boiler body (1), and a circulating heating pipeline (3) is provided on one side of the steam chamber (2), characterized in that: The circulating heating pipeline (3) is equipped with a filter assembly (4), an expansion tank (5), and a constant temperature assembly (6); The expansion tank (5) includes a tank body (501) and an expansion bag (502). The fixed end of the expansion bag (502) is located on one side of the tank body (501), and the movable end of the expansion bag (502) is provided with a tensioning component (503). The fixed part of the tensioning component (503) is located on the other side of the tank body (501). The bottom of the box (501) is provided with a heat insulation plate (504), the top of the heat insulation plate (504) is provided with a water collection port (5041), a water storage bag (505) is provided below the heat insulation plate (504), a water storage head (5051) is provided at the top of the water storage bag (505), and a pressure plate (5043) is provided below the heat insulation plate (504). The pressure plate (5043) is magnetically attached to the movable end of the expansion bag (502). The constant temperature component (6) includes an air outlet connector (601) and an outer sleeve (602). One end of the outer sleeve (602) is connected to the housing (501) through an air supply pipe (603). The housing (501) is connected to the steam chamber (2) through a return air pipe (604). A steam pump is provided on the return air pipe (604).

2. The boiler heating system with return water heating function according to claim 1, characterized in that: The circulating heating pipeline (3) includes an outlet pipe (301), a first return water pipe (302) and a second return water pipe (303). One end of the outlet pipe (301) is connected to a heating pipe, and one end of the heating pipe is connected to the first return water pipe (302). The filter assembly (4) is installed on the first return water pipe (302), and the expansion tank (5) is installed between the first return water pipe (302) and the second return water pipe (303). The first return water pipe (302) has one end near the expansion tank (5) that passes through the tank body (501) and is connected to the expansion bag (502). The second return water pipe (303) has one end near the expansion tank (5) that passes through the tank body (501) and is connected to the expansion bag (502). The second return water pipe (303) has one end near the expansion tank (5) that is a flexible hose.

3. The boiler heating system with return water heating function according to claim 2, characterized in that: The steam chamber (2) is equipped with a heat exchange tube. The end of the liquid outlet pipe (301) away from the heating pipe is connected to the outlet end of the heat exchange tube. The end of the second return water pipe (303) away from the expansion tank (5) is connected to the inlet end of the heat exchange tube. The second return water pipe (303) is equipped with a variable frequency circulating pump and a control valve.

4. The boiler heating system with return water heating function according to claim 1, characterized in that: The filter assembly (4) includes a filter box (401), inside which a filter layer (402) is provided. The filter layer (402) is arranged at an inclination. A storage box (403) is provided on one side of the filter box (401), and the storage box (403) corresponds to the bottom of the filter layer (402).

5. The boiler heating system with return water heating function according to claim 4, characterized in that: The filter layer (402) includes an upper filter layer (4021) and a lower filter layer (4022). An elastic element (4023) is provided between the upper filter layer (4021) and the lower filter layer (4022). The elastic element (4023) is a spring. The pore size of the lower filter layer (4022) is smaller than that of the upper filter layer.

6. The boiler heating system with return water heating function according to claim 5, characterized in that: The storage box (403) is made of transparent material. The joint of the storage box (403) is provided with a sealing connector. The storage box (403) can be detachably installed on one side of the filter box (401) through the sealing connector.

7. The boiler heating system with return water heating function according to claim 1, characterized in that: The water inlet (5041) is located on both sides of the heat insulation plate (504). The heat insulation plate (504) has inclined sides and divides the box (501) into an upper chamber and a lower chamber. The water storage bag (505) is located in the lower chamber. The top of both sides of the water storage bag (505) is provided with connecting pipes (5052). The water storage bag (505) is connected to the water storage head (5051) through the connecting pipes (5052). The water storage head (5051) is correspondingly matched with the water inlet (5041). The pressure plate (5043) has a first magnetic block (5042) on one side top, and the expansion bag (502) has a second magnetic block (5045) at the bottom of the movable end that corresponds to and cooperates with the first magnetic block (5042); The heat insulation plate (504) has a fixing plate (5044) at the bottom, and one end of the water storage bag (505) is fixedly connected to the fixing plate (5044).

8. The boiler heating system with return water heating function according to claim 1, characterized in that: The expansion bag (502) has a limiting member (507) on the outside of its movable end; The limiting component (507) includes a limiting groove (5071) opened inside the box (501), and a limiting plate (5072) is fixedly connected to the side of the expansion bag (502) near the second return water pipe (303), and the limiting plate (5072) and the limiting groove (5071) are correspondingly matched. The limiting plate (5072) is rotatably connected to a ball bearing at one end located within the limiting groove (5071).

9. The boiler heating system with return water heating function according to claim 1, characterized in that: The expansion bag (502) is a corrugated expansion bag, and the stretching assembly (503) is an electric telescopic rod. The movable part of the stretching assembly (503) is fixedly connected to the movable end of the expansion bag (502). The outer sleeve (602) is connected to the steam chamber (2) through the air outlet connector, and the outer sleeve (602) is sleeved on the outside of the liquid outlet pipe (301) and the first return water pipe (302).

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