Condensation type heat exchanger

Abstract

The condensation type heat exchanger comprises a shell, a heat exchange device and a fuel gas combustion device, and a water inlet cavity, a water outlet cavity, a water collecting cavity and an exhaust channel are formed in the shell; the heat exchange device is arranged in the shell, an airflow channel exists between the heat exchange device and the shell, the heat exchange device comprises a first heat exchange structure and a second heat exchange structure which are arranged side by side, each of the first heat exchange structure and the second heat exchange structure comprises at least two heat exchange coils, and all the heat exchange coils are arranged in the shell side by side in the axial direction of the heat exchange coils. The water inlet cavity is communicated with a first connector of the heat exchange coil pipe of the second heat exchange structure, the water collecting cavity is communicated with a second connector of the heat exchange coil pipe of the second heat exchange structure and a second connector of the heat exchange coil pipe of the first heat exchange structure, and the water outlet cavity is communicated with a first connector of the heat exchange coil pipe of the first heat exchange structure. According to the condensation type heat exchanger, the overall water resistance can be lower while it is guaranteed that the overall heat exchange efficiency is high, and the water pressure drop amplitude of water passing through the condensation type heat exchanger is reduced.

Description

Technical Field

[0001] The invention relates to a heat exchanger, in particular to a condensing heat exchanger. Background Art

[0002] Existing condensing heat exchangers are usually single-coil structures, with a heat exchange coil generally installed in the shell. A partition is installed in the heat exchange coil to divide the internal space of the heat exchange coil into a combustion chamber and an exhaust chamber. Gas is usually burned in the combustion chamber to form hot air. Since there is a heat exchange gap between two adjacent circles of the heat exchange coil, the hot air can enter the gap between the heat exchange coil and the shell from the combustion chamber and then enter the exhaust chamber before being discharged. In this process, the water flowing through the heat exchange coil can exchange heat with the hot air. In scenarios with large heat exchange power such as factory boilers, the radial size of the heat exchange coil required for the condensing heat exchanger is increased, and the flow cross-section is increased. In order to ensure the overall heat exchange efficiency, the number of pipe circles of the heat exchange coil is large. In this case, the existing single-coil structure of the condensing heat exchanger has a large overall water resistance, and the water pressure drop after passing through the condensing heat exchanger is large, which affects the use. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a condensing heat exchanger that can lower the overall water resistance while ensuring high overall heat exchange efficiency, thereby reducing the water pressure drop after water passes through the condensing heat exchanger.

[0004] According to an embodiment of the present invention, a condensing heat exchanger comprises a shell, a heat exchange device, and a gas combustion device, wherein a water inlet chamber, a water outlet chamber, a water collecting chamber, and an exhaust passage are arranged in the shell; the heat exchange device is arranged in the shell, and an air flow passage exists between the heat exchange device and the shell, and the heat exchange device comprises a first heat exchange structure and a second heat exchange structure arranged side by side, wherein the first heat exchange structure and the second heat exchange structure each comprise at least two heat exchange coils, and all of the heat exchange coils are arranged side by side in the shell along their axial direction, wherein a first partition is installed on the inner cavity hole of one of the heat exchange coils, wherein a part of the heat exchange coil is enclosed with the first partition to form a heating chamber, and another part of the heat exchange coil is enclosed with the first partition to form a heating chamber The exhaust chamber is connected to the heat exchanger coil through the heat exchange gap on the heat exchange coil, the exhaust chamber is connected to the air flow channel through the heat exchange gap on the heat exchange coil, and the exhaust chamber is connected to the exhaust channel; the gas combustion device is installed on the shell, and the gas combustion device is inserted in the heating chamber; wherein, the second heat exchange structure is far away from the gas combustion device, the water inlet chamber is connected to the first interface of the heat exchange coil of the second heat exchange structure, the water collecting chamber is connected to the second interface of the heat exchange coil of the second heat exchange structure and the second interface of the heat exchange coil of the first heat exchange structure, and the water outlet chamber is connected to the first interface of the heat exchange coil of the first heat exchange structure.

[0005] According to the condensing heat exchanger of the embodiment of the present invention, at least the following beneficial effects are achieved: in the condensing heat exchanger provided by the present invention, water can flow from the water inlet chamber through the second heat exchange structure, the water collecting chamber, the first heat exchange structure and the water outlet chamber in sequence, wherein the second heat exchange structure and the first heat exchange structure each include at least two heat exchange coils arranged in parallel. Therefore, compared with the existing single coil structure, under the condition that the total number of pipe turns of the heat exchange coil is the same to ensure the high overall heat exchange efficiency of the condensing heat exchanger, more than two parallel water paths can be formed between the water inlet chamber and the water collecting chamber, and more than two parallel water paths can be formed between the water collecting chamber and the water outlet chamber. As a result, the total flow area between the water inlet chamber and the water collecting chamber is larger, and the distance the water flows is shorter. The total flow area between the water outlet chamber and the water collecting chamber is larger, and the distance the water flows is shorter, thereby reducing the overall water resistance of the condensing heat exchanger, and the water pressure drop after passing through the condensing heat exchanger is smaller, which is more conducive to application in scenarios with larger heat exchange power.

[0006] According to some embodiments of the present invention, all second interfaces of the heat exchange coils are arranged in a straight line.

[0007] According to some embodiments of the present invention, all first interfaces of the heat exchange coils are arranged in a straight line.

[0008] According to some embodiments of the present invention, a first water box is disposed in the housing, and the water inlet cavity and the water outlet cavity are both disposed in the first water box.

[0009] According to some embodiments of the present invention, the first water box is provided with a water inlet pipe interface communicating with the water inlet cavity and a water outlet pipe interface communicating with the water outlet cavity.

[0010] According to some embodiments of the present invention, the water inlet pipe interface and the water outlet pipe interface are arranged on a side surface of the first water box.

[0011] According to some embodiments of the present invention, a second water box is disposed in the housing, and the water collecting chamber is disposed in the second water box.

[0012] According to some embodiments of the present invention, the water collecting chamber is at a higher position than the water inlet chamber, and the housing is provided with an automatic exhaust valve for exhausting the air in the water collecting chamber.

[0013] According to some embodiments of the present invention, the gas combustion device is provided with a pumping device for pumping air.

[0014] According to some embodiments of the present invention, the gas combustion device is provided with a combustion tube inserted into the heating chamber, and a plurality of exhaust holes are provided on the outer circumference of the combustion tube.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 is a schematic diagram of a condensing heat exchanger according to an embodiment of the present invention;

[0018] Figure 2 for Figure 1 An exploded view of a condensing heat exchanger is shown;

[0019] Figure 3 for Figure 1 A side view of a condensing heat exchanger is shown;

[0020] Figure 4 for Figure 3 A cross-sectional view of the condensing heat exchanger shown on section AA;

[0021] Figure 5 for Figure 3A cross-sectional view of the condensing heat exchanger shown on section BB;

[0022] Figure 6 for Figure 1 A schematic diagram showing the connection relationship between the heat exchange device of the condensing heat exchanger and the first water box;

[0023] Figure 7 for Figure 1 A schematic diagram of a combustion cylinder of a condensing heat exchanger is shown.

[0024] Reference numerals:

[0025] Shell 100, air flow channel 110, first channel 111, second channel 112, exhaust channel 120, heat exchange device 200, first heat exchange structure 200a, second heat exchange structure 200b, heat exchange coil 210, first interface 212, second interface 213, first baffle 220, second baffle 230, third baffle 240, heating chamber 250, exhaust chamber 260, first cavity 261, second cavity 262, limit column 270, pressure relief channel 271, valve stem 280, pressure regulating spring 290, gas combustion device 300, combustion tube 3 10. First cylinder member 311, axial strip hole 3111, second cylinder member 312, circular hole 3121, radial strip hole 3122, blocking cover 313, spiral stirring member 410, driving device 420, vacuum device 510, pumping device 520, first water box 610, water inlet chamber 611, water outlet chamber 612, water inlet pipe interface 613, water outlet pipe interface 614, second water box 620, water collecting chamber 621, first adjusting spring 710, second adjusting spring 720, third adjusting spring 730, trigger switch 800, automatic exhaust valve 900. DETAILED DESCRIPTION

[0026] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0029] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0030] Reference Figure 1 , Figure 2 , Figure 5 and Figure 6 According to an embodiment of the present invention, a condensing heat exchanger includes a shell 100, a heat exchange device 200, and a gas combustion device 300. The shell 100 is provided with a water inlet chamber 611, a water outlet chamber 612, a water collecting chamber 621, and an exhaust passage 120; the heat exchange device 200 is arranged in the shell 100, and an air flow passage 110 exists between the heat exchange device 200 and the shell 100. The heat exchange device 200 includes a first heat exchange structure 200a and a second heat exchange structure 200b arranged side by side. The first heat exchange structure 200a and the second heat exchange structure 200b each include at least two heat exchange coils 210. All the heat exchange coils 210 are arranged side by side in the shell 100 along their axial direction. A first partition plate 220 is installed in the inner cavity hole of one of the heat exchange coils 210, wherein a part of the heat exchange coil 210 and the first partition plate 220 are enclosed to form a heating chamber 250, and another part of the heat exchange coil 210 and the second partition plate 220 are enclosed to form a heating chamber 250. A partition 220 encloses an exhaust chamber 260, the heating chamber 250 is connected to the air flow channel 110 through the heat exchange gap on the heat exchange coil 210, the exhaust chamber 260 is connected to the air flow channel 110 through the heat exchange gap on the heat exchange coil 210, and the exhaust chamber 260 is connected to the exhaust channel 120; the gas combustion device 300 is installed on the shell 100, and the gas combustion device 300 is inserted into the heating chamber 250; wherein, the second heat exchange structure 200b is away from the gas combustion device 300, the water inlet chamber 611 is connected to the first interface 212 of the heat exchange coil 210 of the second heat exchange structure 200b, the water collecting chamber 621 is connected to the second interface 213 of the heat exchange coil 210 of the second heat exchange structure 200b and the second interface 213 of the heat exchange coil 210 of the first heat exchange structure 200a, and the water outlet chamber 612 is connected to the first interface 212 of the heat exchange coil 210 of the first heat exchange structure 200a.

[0031] In the condensing heat exchanger provided by the present invention, water can flow from the water inlet chamber 611 through the second heat exchange structure 200b, the water collecting chamber 621, the first heat exchange structure 200a and the water outlet chamber 612 in sequence, wherein the second heat exchange structure 200b and the first heat exchange structure 200a each include at least two heat exchange coils 210 arranged in parallel. Thus, compared with the existing single coil structure, the total number of pipe turns of the heat exchange coil 210 is the same to ensure the overall high heat exchange efficiency of the condensing heat exchanger. More than two parallel water paths can be formed between the water collecting chambers 621, and more than two parallel water paths can be formed between the water collecting chamber 621 and the water outlet chamber 612. As a result, the total flow area between the water inlet chamber 611 and the water collecting chamber 621 is larger, and the distance the water flows is shorter. The total flow area between the water outlet chamber 612 and the water collecting chamber 621 is larger, and the distance the water flows is shorter, thereby reducing the overall water resistance of the condensing heat exchanger. The water pressure drop after passing through the condensing heat exchanger is smaller, which is more conducive to application in scenarios with higher heat exchange power.

[0032] Reference Figure 2 and Figure 5 According to some embodiments of the present invention, the second interfaces 213 of all the heat exchange coils 210 are arranged in a straight line to facilitate the communication between the water collecting chamber 621 and the second interfaces 213 of all the heat exchange coils 210, which makes installation more convenient.

[0033] Reference Figure 5 According to some embodiments of the present invention, a spiral stirring member 410 is rotatably provided in the water collecting chamber 621, and a driving device 420 for driving the spiral stirring member 410 to rotate is installed in the housing 100, and the second interfaces 213 of all the heat exchange coils 210 are sequentially arranged along the axial direction of the spiral stirring member 410. Therefore, through the rotation of the spiral stirring member 410, on the one hand, the water input into the water collecting chamber 621 by each heat exchange coil 210 of the second heat exchange structure 200b can be stirred and mixed to make the water temperature uniform, and on the other hand, the water path can be increased through the spiral stirring member 410 to play a role in compensating the water pressure.

[0034] Reference Figure 2 and Figure 6 According to some embodiments of the present invention, the first interfaces 212 of all the heat exchange coils 210 are arranged in a straight line to facilitate the communication between the water collecting chamber 621 and the first interfaces 212 of all the heat exchange coils 210, which makes installation more convenient.

[0035] Reference Figure 2 and Figure 6 According to some embodiments of the present invention, a first water box 610 is disposed in the housing 100, and the water inlet cavity 611 and the water outlet cavity 612 are both disposed in the first water box 610. In the specific production process, the first water box 610 and the housing 100 are formed separately to facilitate production and later assembly.

[0036] Reference Figure 2 and Figure 6 According to some embodiments of the present invention, the first water box 610 is provided with a water inlet pipe interface 613 communicating with the water inlet chamber 611 and a water outlet pipe interface 614 communicating with the water outlet chamber 612 .

[0037] According to some embodiments of the present invention, the water inlet pipe interface 613 and the water outlet pipe interface 614 are arranged on one side of the first water box 610. Therefore, the water inlet pipe interface 613 and the water outlet pipe interface 614 are located on the same side of the first water box 610, which can facilitate external pipe connection.

[0038] Reference Figure 2 and Figure 5 According to some embodiments of the present invention, a second water box 620 is disposed in the housing 100, and the water collecting chamber 621 is disposed in the second water box 620. In the specific production process, the second water box 620 and the housing 100 are formed separately to facilitate production and later assembly.

[0039] Reference Figure 2 and Figure 5 According to some embodiments of the present invention, the water collecting chamber 621 is at a higher position than the water inlet chamber 611, and the housing 100 is provided with an automatic exhaust valve 900, which is used to exhaust the air in the water collecting chamber 621. Thus, the condensing heat exchanger can be installed in a circulating water system, and when water is injected into the pipes of the circulating water system, the air in the pipes can be exhausted from the automatic exhaust valve 900.

[0040] Reference Figures 1 to 4 According to some embodiments of the present invention, the gas combustion device 300 is provided with a pumping device 520 for pumping air. Thus, the gas combustion device 300 can pump air into the heating chamber 250 through the pumping device 520 to make the gas burn more completely.

[0041] Reference Figure 4 and Figure 7 According to some embodiments of the present invention, the gas combustion device 300 is provided with a combustion tube 310 inserted into the heating chamber 250, and a plurality of discharge holes are provided on the periphery of the combustion tube 310. During the operation of the gas combustion device 300, the discharge holes on the combustion tube 310 can radially discharge gas to form flames to directly burn the heat exchange coil 210 at the heating chamber 250, so as to transfer heat to the water flow in the heat exchange coil 210 more quickly through the flame with a higher temperature.

[0042] Reference Figure 2 and Figure 4According to some embodiments of the present invention, a second partition plate 230 is arranged between the heat exchange device 200 and the shell 100, and the second partition plate 230 divides the air flow channel 110 into a first channel 111 and a second channel 112. A third partition plate 240 is arranged in the exhaust cavity 260, and the third partition plate 240 divides the exhaust cavity 260 into a first cavity 261 and a second cavity 262. The first channel 111 is connected to the first cavity 261 through the heat exchange gap on the corresponding heat exchange coil 210, the first cavity 261 is connected to the second channel 112 through the heat exchange gap on the corresponding heat exchange coil 210, the second channel 112 is connected to the second cavity 262 through the heat exchange gap on the corresponding heat exchange coil 210, and the second cavity 262 is connected to the exhaust channel 120. Therefore, the hot air in the shell 100 needs to flow through the first channel 111, the first cavity 261, the second channel 112 and the second cavity 262 from the heating chamber 250 in sequence before it can be discharged from the exhaust channel 120, which effectively increases the contact time between the hot air and the heat exchange device 200, improves the heat exchange rate between the hot air and the heat exchange device 200, reduces heat energy waste, increases the energy efficiency of the condensing heat exchanger, and makes the condensing heat exchanger more energy-saving and environmentally friendly.

[0043] Reference Figure 2 and Figure 4 According to some embodiments of the present invention, an exhaust device 510 is installed at the exhaust passage 120. Therefore, the condensing heat exchanger provided by the present invention can pump air into the air at a positive pressure through the pumping device 520, and exhaust the air in cooperation with the exhaust device 510. Among them, the negative pressure can be controlled by controlling the operating speed of the exhaust device 510, thereby controlling the air exhaust speed, and realizing the control of the contact time between the hot air and the heat exchange device 200.

[0044] In the specific implementation process, when the third partition 240 and the second partition 230 are provided, the resistance encountered by the hot air may be too large, and a negative pressure can be formed by the exhaust device 510, so that the condensing heat exchanger can discharge the air smoothly, preventing the air pressure in the heating chamber 250 from being too high.

[0045] When the third partition 240 and the second partition 230 are not provided, by reducing the operating speed of the vacuum device 510 or operating the vacuum device 510 in reverse, the air in the outer shell 100 can be prevented from being discharged from the exhaust passage 120, thereby avoiding the situation where the hot air in the outer shell 100 is discharged too quickly, increasing the contact time between the hot air and the heat exchange device 200, and improving the heat exchange rate.

[0046] Reference Figure 4According to some embodiments of the present invention, a position adjustment structure is provided between the first baffle 220 and the heat exchange device 200, and the position adjustment structure is used to slide and adjust the position of the first baffle 220 along the inner wall of the heat exchange coil 210. Thus, when the pressure in the heating chamber 250 is kept within a certain range, the position of the first baffle 220 can be adjusted by the position adjustment structure to change the size of the heating chamber 250, thereby changing the total amount of air and gas allowed to be pumped into the heating chamber 250 per unit time, thereby achieving the adjustment of the maximum allowable power of the condensing heat exchanger.

[0047] Reference Figure 4 and Figure 6 According to some embodiments of the present invention, the combustion tube 310 includes a first tube member 311, a second tube member 312 and a stopper 313 which are slidably nested together. The outer peripheral walls of the first tube member 311 and the second tube member 312 are both provided with discharge holes. The first baffle 220 is connected to the first tube member 311. The first baffle 220 can drive the first tube member 311 to slide relative to the second tube member 312. The stopper 313 closes one end of the first tube member 311 away from the second tube member 312. Therefore, when the size of the heating chamber 250 is adjusted by adjusting the position of the first baffle 220, the first tube member 311 can be simultaneously extended and retracted relative to the second tube member 312, thereby synchronously adjusting the length of the combustion tube 310 axially. Since both the first cylinder member 311 and the second cylinder member 312 are provided with discharge holes, when the heating chamber 250 becomes larger, the entire combustion cylinder 310 can have more discharge holes in its axial direction to emit flames, thereby avoiding the situation where there is little or no flame in the local area when the heating chamber 250 becomes larger, making the flame distribution more uniform, which is more conducive to the heat exchange device 200 absorbing heat. The various heat exchange coils 210 in the heating chamber 250 can absorb heat more evenly, reducing the uneven heating of water.

[0048] Reference Figure 6In the specific implementation process, at least part of the discharge holes arranged on the outer peripheral wall of the second cylinder 312 are circular holes 3121 or radial strip holes 3122 extending along the circumference of the second cylinder 312, and the discharge holes arranged on the outer peripheral wall of the first cylinder 311 are axial strip holes 3111 extending along the axial direction of the first cylinder 311, and the width of the axial strip holes 3111 is not less than the diameter of the circular holes 3121 or the width of the radial strip holes 3122, wherein the circular holes 3121 or the radial strip holes 3122 are circumferentially opposite to the first cylinder 311. The angular position of the axial strip hole 3111 in the circumferential direction is consistent with the angular position of the axial strip hole 3111 relative to the first cylinder 311. Therefore, during the sliding process of the first cylinder 311 relative to the second cylinder 312, the axial strip hole 3111 and the corresponding circular hole 3121 or radial strip hole 3122 on the overlapping part of the first cylinder 311 and the second cylinder 312 can overlap and connect, so as to prevent the first cylinder 311 from blocking the second cylinder 312 from emitting flames, and enable the overlapping part of the first cylinder 311 and the second cylinder 312 to emit flames.

[0049] Reference Figure 4 According to some embodiments of the present invention, the position adjustment structure includes a first adjustment spring 710 disposed between the first baffle 220 and the third baffle 240, the third baffle 240 can slide along the inner wall of the heat exchange coil 210, a second adjustment spring 720 is disposed between the third baffle 240 and the side wall of the exhaust passage 120, the second baffle 230 can slide in the air flow passage 110 along the axial direction of the heat exchange coil 210, and a third adjustment spring 730 is connected between the second baffle 230 and the housing 100. Thus, according to the amount of gas and air fed into the gas combustion device 300 per unit time, the first baffle 220 can automatically adjust its position, and then automatically adjust the size of the heating chamber 250, so that the pressure of the heating chamber 250 is maintained within a certain range, and at the same time, the third baffle 240 can also automatically adjust its position to avoid the third baffle 240 and the first baffle 220 overlapping to block the air circulation.

[0050] Through the above arrangement, the first baffle 220, the second baffle 230, and the third baffle 240 can automatically adjust their positions according to the air pressure conditions they are subjected to, without the need for manual position adjustment, which is more convenient to use.

[0051] Reference Figure 4In some embodiments, a first limiting structure is provided between the third partition 240 and the first partition 220, and a second limiting structure is provided between the heat exchange device 200 and the third partition 240. The second limiting structure is used to limit the range of movement of the third partition 240 toward the exhaust device 510 to prevent the third partition 240 from blocking the air discharge. The first limiting structure is used to limit the range of movement of the first partition 220 toward the third partition 240 to prevent the first partition 220 and the second partition 230 from overlapping and blocking the air circulation.

[0052] Reference Figure 4 In a specific implementation process, the first limiting structure may include a limiting column 270 , one end of the limiting column 270 is connected to the first partition plate 220 , and the other end is spaced apart from the third partition plate 240 .

[0053] Reference Figure 4 In some embodiments, a pressure relief channel 271 is provided in the limiting column 270, and the pressure relief channel 271 is connected to the heating chamber 250. A pressure relief valve is provided at one end of the limiting column 270 close to the third partition plate 240, and the pressure relief valve is used to open and close the pressure relief channel 271. In this way, if the pressure in the heating chamber 250 exceeds the set value, the pressure relief valve can relieve the pressure of the heating chamber 250 to achieve pressure relief protection.

[0054] Reference Figure 4 The pressure relief valve includes a valve stem 280, and a pressure relief hole connected to the pressure relief channel 271 is arranged on the outer periphery of the limiting column 270. One end of the valve stem 280 is penetrated through the pressure relief channel 271 and the other end is penetrated through the third partition plate 240. A pressure regulating spring 290 is arranged between the other end of the valve stem 280 and the outer shell 100. The pressure regulating spring 290 is used to drive the valve stem 280 to move toward the heating chamber 250 to block the pressure relief hole. When the pressure in the heating chamber 250 exceeds the set value, the pressure in the heating chamber 250 can drive the valve stem 280 to move toward the vacuum device 510 to avoid the pressure relief hole.

[0055] Reference Figure 4 In some embodiments, a trigger switch 800 is provided on the housing 100, and the trigger switch 800 is electrically connected to the air extraction device 510. The trigger switch 800 is correspondingly provided to an end of the valve stem 280 close to the air extraction device 510. When the valve stem 280 moves toward the air extraction device 510 to avoid the pressure relief hole, the valve stem 280 abuts against the trigger switch 800, so that the trigger switch 800 triggers the air extraction device 510 to increase the air extraction power. Therefore, when the pressure in the heating chamber 250 exceeds the set value, the condensing heat exchanger can release pressure more quickly through the pressure relief valve and automatically increase the air extraction power of the air extraction device 510.

[0056] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A condensing heat exchanger, characterized in that: include: A housing (100), wherein a water inlet chamber (611), a water outlet chamber (612), a water collecting chamber (621) and an exhaust passage (120) are provided in the housing (100); A heat exchange device (200) is arranged in the housing (100), an air flow channel (110) is present between the heat exchange device (200) and the housing (100), the heat exchange device (200) comprises a first heat exchange structure (200a) and a second heat exchange structure (200b) arranged side by side, the first heat exchange structure (200a) and the second heat exchange structure (200b) each comprising at least two heat exchange coils (210), all of the heat exchange coils (210) are arranged side by side in the housing (100) along their axial direction, and an inner cavity hole of one of the heat exchange coils (210) is installed A first partition (220) is provided, wherein a portion of the heat exchange coil (210) and the first partition (220) enclose a heating chamber (250), and another portion of the heat exchange coil (210) and the first partition (220) enclose an exhaust chamber (260), the heating chamber (250) is communicated with the air flow channel (110) through a heat exchange gap on the heat exchange coil (210), the exhaust chamber (260) is communicated with the air flow channel (110) through a heat exchange gap on the heat exchange coil (210), and the exhaust chamber (260) is communicated with the exhaust channel (120); A gas combustion device (300) is installed on the housing (100), and the gas combustion device (300) is inserted into the heating chamber (250); The second heat exchange structure (200b) is far away from the gas combustion device (300), the water inlet chamber (611) is in communication with the first interface (212) of the heat exchange coil (210) of the second heat exchange structure (200b), the water collecting chamber (621) is in communication with the second interface (213) of the heat exchange coil (210) of the second heat exchange structure (200b) and the second interface (213) of the heat exchange coil (210) of the first heat exchange structure (200a), and the water outlet chamber (612) is in communication with the first interface (212) of the heat exchange coil (210) of the first heat exchange structure (200a).

2. A condensing heat exchanger according to claim 1, characterized in that: The second interfaces (213) of all the heat exchange coils (210) are arranged in a straight line.

3. The condensing heat exchanger according to claim 1, characterized in that: The first interfaces (212) of all the heat exchange coils (210) are arranged in a straight line.

4. A condensing heat exchanger according to claim 3, characterized in that: A first water box (610) is disposed in the housing (100), and the water inlet chamber (611) and the water outlet chamber (612) are both disposed in the first water box (610).

5. A condensing heat exchanger according to claim 4, characterized in that: The first water box (610) is provided with a water inlet pipe interface (613) communicating with the water inlet chamber (611) and a water outlet pipe interface (614) communicating with the water outlet chamber (612).

6. A condensing heat exchanger according to claim 5, characterized in that: The water inlet pipe interface (613) and the water outlet pipe interface (614) are arranged on a side surface of the first water box (610).

7. The condensing heat exchanger according to claim 2, characterized in that: A second water box (620) is disposed in the housing (100), and the water collecting chamber (621) is disposed in the second water box (620).

8. The condensing heat exchanger according to claim 1, characterized in that: The water collecting chamber (621) is located at a higher position than the water inlet chamber (611), and the housing (100) is provided with an automatic exhaust valve (900), which is used to exhaust the air in the water collecting chamber (621).

9. The condensing heat exchanger according to claim 1, characterized in that: The gas combustion device (300) is provided with a pumping device (520) for pumping air.

10. The condensing heat exchanger according to claim 1, characterized in that: The gas combustion device (300) is provided with a combustion cylinder (310) inserted into the heating chamber (250), and a plurality of discharge holes are provided on the outer periphery of the combustion cylinder (310).

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