Condensing heat exchanger

Abstract

The present invention discloses a condensing heat exchanger, which comprises a housing, a heat exchange device, and a gas combustion device. An inlet water chamber, an outlet water chamber, a water collection chamber, and an exhaust passage are arranged inside the housing; the heat exchange device is arranged inside the housing, and an air flow passage exists between the heat exchange device and the housing. The heat exchange device comprises a first heat exchange structure and a second heat exchange structure arranged side by side. Both the first heat exchange structure and the second heat exchange structure comprise at least two heat exchange coils. All the heat exchange coils are arranged side by side along their axial directions inside the housing. The inlet water chamber is communicated with a first interface of the heat exchange coils of the second heat exchange structure. The water collection chamber is communicated with a second interface of the heat exchange coils of the second heat exchange structure and a second interface of the heat exchange coils of the first heat exchange structure. The outlet water chamber is communicated with a first interface of the heat exchange coils of the first heat exchange structure. The condensing heat exchanger provided by the present invention can make the overall water resistance lower while ensuring high overall heat exchange efficiency, and reduce the water pressure drop after water passes through the condensing heat exchanger.

Description

Technical Field

[0001] The present invention relates to a heat exchanger, and particularly to a condensing heat exchanger. Background Art

[0002] Existing condensing heat exchangers usually have a single coil structure. Generally, one heat exchange coil is installed inside the outer shell, and partitions are installed inside the heat exchange coil to divide the internal space of the heat exchange coil into a combustion chamber and an exhaust cavity. Gas usually burns in the combustion chamber to form hot air. Since there is a heat exchange gap between adjacent two circles of pipes of the heat exchange coil, the hot air can enter the gap between the heat exchange coil and the outer shell from the combustion chamber and then enter the exhaust cavity and be discharged. During this process, the water flowing through the heat exchange coil can exchange heat with the hot air. In scenarios with a relatively large heat exchange power such as industrial boilers, the radial dimension of the heat exchange coil required by the condensing heat exchanger increases and the flow cross-section increases. In order to ensure the overall heat exchange efficiency, the number of pipe circles of the heat exchange coil is large. In this case, for the existing single-coil structure of the condensing heat exchanger, its overall water resistance is large, and the water pressure drop after the water passes 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. For this purpose, the present invention provides a condensing heat exchanger, which can have a lower overall water resistance while ensuring a high overall heat exchange efficiency, and reduce the water pressure drop after the water passes through the condensing heat exchanger.

[0004] A condensing heat exchanger according to an embodiment of the present invention includes a housing, a heat exchange device, and a gas combustion device. An inlet water chamber, an outlet water chamber, a water collection chamber, and an exhaust passage are provided inside the housing. The heat exchange device is disposed inside the housing, and an air flow passage exists between the heat exchange device and the housing. The heat exchange device includes a first heat exchange structure and a second heat exchange structure arranged side by side. Both the first heat exchange structure and the second heat exchange structure include at least two heat exchange coils. All the heat exchange coils are arranged side by side along their axial directions inside the housing. A first partition is installed in the inner cavity hole of one of the heat exchange coils. A part of the heat exchange coils and the first partition enclose a heating chamber, and another part of the heat exchange coils and the first partition enclose an exhaust chamber. The heating chamber communicates with the air flow passage through a heat exchange gap on the heat exchange coil, and the exhaust chamber communicates with the air flow passage through a heat exchange gap on the heat exchange coil. The exhaust chamber communicates with the exhaust passage. The gas combustion device is installed on the housing and is inserted into the heating chamber. Among them, the second heat exchange structure is far from the gas combustion device. The inlet water chamber communicates with a first interface of the heat exchange coils of the second heat exchange structure. The water collection chamber communicates with a second interface of the heat exchange coils of the second heat exchange structure and a second interface of the heat exchange coils of the first heat exchange structure. The outlet water chamber communicates with a first interface of the heat exchange coils of the first heat exchange structure.

[0005] The condensing heat exchanger according to an embodiment of the present invention has at least the following beneficial effects: For the condensing heat exchanger provided by the present invention, water can flow through the second heat exchange structure, the water collection chamber, the first heat exchange structure, and the outlet water chamber in sequence from the inlet water chamber. Among them, both the second heat exchange structure and the first heat exchange structure include at least two heat exchange coils arranged in parallel. Therefore, compared with the existing single-coil structure, when the total number of pipe turns of the heat exchange coils is the same to ensure high overall heat exchange efficiency of the condensing heat exchanger, more than two parallel water paths can be formed between the inlet water chamber and the water collection chamber, and more than two parallel water paths can be formed between the water collection chamber and the outlet water chamber. Thus, the total flow area between the inlet water chamber and the water collection chamber is larger, and the flow path of the water is shorter. The total flow area between the outlet water chamber and the water collection chamber is larger, and the flow path of the water is shorter. Thereby, the overall water resistance of the condensing heat exchanger is reduced, the water pressure drop after the water passes through the condensing heat exchanger is smaller, and it is more conducive to being applied to scenarios with a larger heat exchange power.

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

[0007] According to some embodiments of the present invention, the first interfaces of all 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 inside the housing, and the water inlet cavity and the water outlet cavity are both disposed inside 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 disposed on one side surface of the first water box.

[0011] According to some embodiments of the present invention, a second water box is disposed inside the housing, and the water collection cavity is disposed inside the second water box.

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

[0013] According to some embodiments of the present invention, the gas combustion device is configured 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 cylinder inserted into the heating cavity, and a plurality of discharge holes are disposed on the outer periphery of the combustion cylinder.

[0015] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or will be understood through the 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 obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

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

[0018] Figure 2 is Figure 1 an exploded view of the condensing heat exchanger shown;

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

[0020] Figure 4 is Figure 3 a cross-sectional view of the condensing heat exchanger shown taken along the A-A section;

[0021] Figure 5 is Figure 3Cross-sectional view of the shown condensing heat exchanger at section B-B;

[0022] Figure 6 For Figure 1 Schematic diagram of the connection relationship between the heat exchange device and the first water box of the shown condensing heat exchanger;

[0023] Figure 7 For Figure 1 Schematic diagram of the combustion cylinder of the shown condensing heat exchanger.

[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 partition 220, second partition 230, third partition 240, heating cavity 250, exhaust cavity 260, first cavity 261, second cavity 262, limit post 270, pressure relief channel 271, valve stem 280, pressure regulating spring 290, gas combustion device 300, combustion cylinder 310, first cylinder member 311, axial strip hole 3111, second cylinder member 312, circular hole 3121, radial strip hole 3122, cover 313, spiral stirring member 410, driving device 420, air extraction device 510, pumping device 520, first water box 610, water inlet cavity 611, water outlet cavity 612, water inlet pipe interface 613, water outlet pipe interface 614, second water box 620, water collection cavity 621, first adjusting spring 710, second adjusting spring 720, third adjusting spring 730, trigger switch 800, automatic exhaust valve 900. Detailed Description of the Invention

[0026] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0027] In the description of the present invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0028] In the description of the present invention, the meaning of "several" is one or more, the meaning of "multiple" is more than two, and understandings such as "greater than", "less than", "exceeding", etc. do not include the present number, and understandings such as "above", "below", "within", etc. include the present number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0029] In the description of the present invention, unless otherwise clearly defined, words such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0030] Referring to Figure 1 , Figure 2 , Figure 5 and Figure 6 , according to the condensing heat exchanger of the embodiment of the present invention, it includes a housing 100, a heat exchange device 200, and a gas combustion device 300. An inlet water chamber 611, an outlet water chamber 612, a water collection chamber 621, and an exhaust passage 120 are provided in the housing 100; the heat exchange device 200 is arranged in the housing 100, and there is an air flow passage 110 between the heat exchange device 200 and the housing 100. The heat exchange device 200 includes a first heat exchange structure 200a and a second heat exchange structure 200b arranged side by side. Both the first heat exchange structure 200a and the second heat exchange structure 200b include at least two heat exchange coils 210. All the heat exchange coils 210 are arranged side by side along their axial directions in the housing 100. A first partition 220 is installed in the inner cavity hole of one of the heat exchange coils 210. A part of the heat exchange coils 210 and the first partition 220 enclose a heating chamber 250, and another part of the heat exchange coils 210 and the first partition 220 enclose an exhaust chamber 260. The heating chamber 250 is communicated with the air flow passage 110 through the heat exchange gaps on the heat exchange coils 210, and the exhaust chamber 260 is communicated with the air flow passage 110 through the heat exchange gaps on the heat exchange coils 210. The exhaust chamber 260 is communicated with the exhaust passage 120; the gas combustion device 300 is installed in the housing 100, and the gas combustion device 300 is inserted into the heating chamber 250; wherein, the second heat exchange structure 200b is far from the gas combustion device 300. The inlet water chamber 611 is communicated with the first interface 212 of the heat exchange coils 210 of the second heat exchange structure 200b. The water collection chamber 621 is communicated with the second interface 213 of the heat exchange coils 210 of the second heat exchange structure 200b and the second interface 213 of the heat exchange coils 210 of the first heat exchange structure 200a. The outlet water chamber 612 is communicated with the first interface 212 of the heat exchange coils 210 of the first heat exchange structure 200a.

[0031] In the condensing heat exchanger provided by the present invention, water can flow 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 from the water inlet chamber 611. Among them, both the second heat exchange structure 200b and the first heat exchange structure 200a include at least two heat exchange coils 210 arranged in parallel. Therefore, compared with the existing single-coil structure, when the total number of pipe turns of the heat exchange coils 210 is the same to ensure high overall heat exchange efficiency of the condensing heat exchanger, more than two parallel water paths can be formed between the water inlet chamber 611 and the water collecting chamber 621, and more than two parallel water paths can be formed between the water collecting chamber 621 and the water outlet chamber 612. Thus, the total flow area between the water inlet chamber 611 and the water collecting chamber 621 is larger, and the flow path of water is shorter; the total flow area between the water outlet chamber 612 and the water collecting chamber 621 is larger, and the flow path of water is shorter. As a result, the overall water resistance of the condensing heat exchanger is reduced, and the pressure drop of water after passing through the condensing heat exchanger is smaller, which is more conducive to being applied to scenarios with larger heat exchange power.

[0032] Refer to 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 connection between the water collecting chamber 621 and the second interfaces 213 of all the heat exchange coils 210, making the installation more convenient.

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

[0034] Refer to 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 connection between the water collecting chamber 621 and the first interfaces 212 of all the heat exchange coils 210, making the installation more convenient.

[0035] Refer to Figure 2 and Figure 6 , according to some embodiments of the present invention, a first water box 610 is arranged in the outer shell 100, and the water inlet chamber 611 and the water outlet chamber 612 are both arranged in the first water box 610. During the specific production process, the first water box 610 and the outer shell 100 are formed separately to facilitate production and subsequent 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 cavity 611 and a water outlet pipe interface 614 communicating with the water outlet cavity 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 surface of the first water box 610. Thus, the water inlet pipe interface 613 and the water outlet pipe interface 614 are located on the same side surface of the first water box 610, which can facilitate the external connection of pipes.

[0038] Reference Figure 2 and Figure 5 , according to some embodiments of the present invention, a second water box 620 is arranged inside the housing 100, and a water collection cavity 621 is arranged inside the second water box 620. In the specific production process, the second water box 620 and the housing 100 are integrally formed separately to facilitate production and subsequent assembly.

[0039] Reference Figure 2 and Figure 5 , according to some embodiments of the present invention, the water collection cavity 621 is at a higher position than the water inlet cavity 611, and the housing 100 is equipped with an automatic exhaust valve 900, and the automatic exhaust valve 900 is used to discharge the air existing in the water collection cavity 621. Thus, the condensing heat exchanger can be installed in the circulating water system, and when injecting water into the pipes of the circulating water system, the air in the pipes can be discharged 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 configured with a pumping device 520 for pumping air. Thus, the gas combustion device 300 can pump air into the heating cavity 250 through the pumping device 520 to make the gas combustion more sufficient.

[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 cylinder 310 inserted into the heating cavity 250, and a plurality of discharge holes are arranged on the outer periphery of the combustion cylinder 310. During the operation of the gas combustion device 300, the discharge holes on the combustion cylinder 310 can radially discharge gas to form a flame to directly burn the heat exchange coil 210 at the heating cavity 250, so as to transfer heat to the water flow in the heat exchange coil 210 faster through the relatively high-temperature flame.

[0042] Reference Figure 2 and Figure 4, according to some embodiments of the present invention, a second partition 230 is provided between the heat exchange device 200 and the housing 100. The second partition 230 divides the air flow channel 110 into a first channel 111 and a second channel 112. A third partition 240 is provided in the exhaust cavity 260. The third partition 240 divides the exhaust cavity 260 into a first cavity 261 and a second cavity 262. The first channel 111 communicates with the first cavity 261 through the heat exchange gaps on the corresponding heat exchange coil 210. The first cavity 261 communicates with the second channel 112 through the heat exchange gaps on the corresponding heat exchange coil 210. The second channel 112 communicates with the second cavity 262 through the heat exchange gaps on the corresponding heat exchange coil 210. The second cavity 262 communicates with the exhaust channel 120. Thus, the hot air in the housing 100 needs to flow through the first channel 111, the first cavity 261, the second channel 112, and the second cavity 262 in sequence from the heating cavity 250 before it can be discharged from the exhaust channel 120, effectively increasing the contact time between the hot air and the heat exchange device 200, improving the heat exchange rate between the hot air and the heat exchange device 200, reducing heat energy waste, increasing the energy efficiency of the condensing heat exchanger, and making the condensing heat exchanger more energy-saving and environmentally friendly.

[0043] Referring to Figure 2 and Figure 4 , according to some embodiments of the present invention, an air extraction device 510 is installed at the exhaust channel 120. Thus, for the condensing heat exchanger provided by the present invention, air can be pumped in positively by the pumping device 520 and exhausted in cooperation with the air extraction device 510. Among them, the negative pressure magnitude can be controlled by controlling the operating speed of the air extraction device 510, thereby controlling the air discharge 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 suffered by the hot air may be too large. A negative pressure can be formed by the air extraction device 510, so that the condensing heat exchanger can smoothly discharge air and prevent the air pressure at the heating cavity 250 from being too large.

[0045] When the above-mentioned third partition 240 and second partition 230 are not provided, by reducing the operating speed of the air extraction device 510 or operating the air extraction device 510 in reverse, the air in the housing 100 can be blocked from being discharged from the exhaust channel 120, thereby avoiding the situation where the discharge speed of the hot air in the housing 100 is too large, increasing the contact time between the hot air and the heat exchange device 200, and improving the heat exchange rate.

[0046] Referring to Figure 4, according to some embodiments of the present invention, a position adjustment structure is provided between the first partition plate 220 and the heat exchange device 200, and the position adjustment structure is used to slide along the inner wall of the heat exchange coil 210 to adjust the position of the first partition plate 220. Thus, when the pressure in the heating chamber 250 is maintained within a certain range, the position of the first partition plate 220 can be adjusted through the position adjustment structure to change the size of the heating chamber 250, and then change the total amount of air and gas allowed to be pumped into the heating chamber 250 per unit time, so as to realize the adjustment of the maximum allowable power of the condensing heat exchanger.

[0047] Referring to Figure 4 and Figure 6 , according to some embodiments of the present invention, the combustion cylinder 310 includes a first cylinder member 311, a second cylinder member 312 and a cover 313 that are slidably nested together. Discharge holes are provided on the outer peripheral walls of the first cylinder member 311 and the second cylinder member 312. The first partition plate 220 is connected to the first cylinder member 311, and the first partition plate 220 can drive the first cylinder member 311 to slide relative to the second cylinder member 312. The cover 313 closes one end of the first cylinder member 311 facing away from the second cylinder member 312. Thus, when adjusting the size of the heating chamber 250 by adjusting the position of the first partition plate 220, the first cylinder member 311 can be synchronously telescoped relative to the second cylinder member 312, and then the length of the combustion cylinder 310 can be axially adjusted synchronously. Since discharge holes are provided on both the first cylinder member 311 and the second cylinder member 312, when the heating chamber 250 becomes larger, more discharge holes can emit flames in the axial direction of the entire combustion cylinder 310, avoiding the situation of less or no flames in a local area when the heating chamber 250 becomes larger, making the flame distribution more uniform, being more conducive to the heat exchange device 200 to absorb heat, and each heat exchange coil 210 at the heating chamber 250 can absorb heat more evenly, reducing the uneven water heating situation.

[0048] Referring to Figure 6, in the specific implementation process, at least part of the discharge holes provided on the outer peripheral wall of the second cylinder member 312 are circular holes 3121 or radial strip holes 3122 extending along the circumferential direction of the second cylinder member 312, and the discharge holes provided on the outer peripheral wall of the first cylinder member 311 are axial strip holes 3111 extending along the axial direction of the first cylinder member 311. 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. Among them, the angular position of the circular holes 3121 or the radial strip holes 3122 relative to the circumferential direction of the first cylinder member 311 is the same as the angular position of the axial strip holes 3111 relative to the circumferential direction of the first cylinder member 311. Thus, during the sliding process of the first cylinder member 311 relative to the second cylinder member 312, the axial strip holes 3111 and the corresponding circular holes 3121 or radial strip holes 3122 on the overlapping part of the first cylinder member 311 and the second cylinder member 312 can overlap and communicate, preventing the first cylinder member 311 from blocking the flame emerging from the second cylinder member 312, so that the overlapping part of the first cylinder member 311 and the second cylinder member 312 can also emit flames.

[0049] Refer to Figure 4 , according to some embodiments of the present invention, the position adjustment structure includes a first adjustment spring 710 disposed between the first partition 220 and the third partition 240. The third partition 240 can slide along the inner wall of the heat exchange coil 210. A second adjustment spring 720 is disposed between the third partition 240 and the side wall of the exhaust passage 120. The second partition 230 can slide along the axial direction of the heat exchange coil 210 in the air flow passage 110. A third adjustment spring 730 is connected between the second partition 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 partition 220 can automatically adjust its own position, and further automatically adjust the size of the heating chamber 250, so that the pressure in the heating chamber 250 is maintained within a certain range. At the same time, the third partition 240 can also automatically adjust its own position to prevent the third partition 240 from overlapping with the first partition 220 and blocking the air flow.

[0050] Through the above settings, the first partition 220, the second partition 230, and the third partition 240 can all automatically adjust their positions according to the air pressure they receive, without manual adjustment, which is more convenient to use.

[0051] Refer to Figure 4, in some embodiments, a first limiting structure is provided between the third partition plate 240 and the first partition plate 220, and a second limiting structure is provided between the heat exchange device 200 and the third partition plate 240. The second limiting structure is used to limit the range of movement of the third partition plate 240 towards the air extraction device 510 to prevent the third partition plate 240 from blocking the air discharge. The first limiting structure is used to limit the range of movement of the first partition plate 220 towards the third partition plate 240 to prevent the first partition plate 220 and the second partition plate 230 from overlapping in position, resulting in blocked air circulation.

[0052] Refer to Figure 4 , in the specific implementation process, the first limiting structure may include a limiting post 270. One end of the limiting post 270 is connected to the first partition plate 220, and the other end is spaced from the third partition plate 240.

[0053] Refer to Figure 4 , in some embodiments, a pressure relief channel 271 is provided in the limiting post 270. The pressure relief channel 271 is communicated with the heating chamber 250. A pressure relief valve is provided at one end of the limiting post 270 close to the third partition plate 240. The pressure relief valve is used to open and close the pressure relief channel 271. Thus, 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] Refer to Figure 4 , the pressure relief valve includes a valve stem 280. A pressure relief hole communicated with the pressure relief channel 271 is provided on the outer periphery of the limiting post 270. One end of the valve stem 280 passes through the pressure relief channel 271 and the other end passes through the third partition plate 240. A pressure regulating spring 290 is provided between the other end of the valve stem 280 and the housing 100. The pressure regulating spring 290 is used to drive the valve stem 280 to move towards 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 towards the air extraction device 510 to avoid the pressure relief hole.

[0055] Refer to Figure 4 , in some embodiments, a trigger switch 800 is provided on the housing 100. The trigger switch 800 is electrically connected to the air extraction device 510. The trigger switch 800 is correspondingly arranged with one end of the valve stem 280 close to the air extraction device 510. When the valve stem 280 moves towards the air extraction device 510 to avoid the pressure relief hole, the valve stem 280 contacts the trigger switch 800, causing the trigger switch 800 to trigger the air extraction device 510 to increase the air extraction power. Thus, when the pressure in the heating chamber 250 exceeds the set value, the condensing heat exchanger can relieve the pressure more quickly through the pressure relief valve and automatically increasing the air extraction power of the air extraction device 510.

[0056] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0057] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

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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