Condensing boiler with control box

Abstract

The application belongs to the technical field of condensing boilers, and discloses a condensing boiler with a control box, which comprises a boiler equipment box main body, the front end of the boiler equipment box main body is slidably connected with a sliding maintenance door plate, and further comprises a plug-in locking assembly for assembling the boiler equipment box main body and the sliding maintenance door plate. The plug-in locking assembly, the mechanical trigger linkage assembly and the maintenance light supplementing assembly are matched in structure, and the plug-in action of the lower locking bolt and the elastic deformation of the elastic push block form a pure mechanical linkage logic. When the equipment is normally locked, the maintenance light supplementing assembly remains in an extinguished state. When the locking bolt is unlocked and drawn out, the elastic push block is automatically reset and pushes the flexible trigger piece to touch the switch, so that the lighting is automatically turned on. After the locking bolt is reinserted and locked, the elastic push block can be squeezed again to turn off the lighting. The lighting switch does not need to be manually controlled throughout the process, and the lighting on-off switching is automatically completed, which greatly improves the energy-saving property of the equipment.

Description

Technical Field

[0001] This invention belongs to the field of condensing boiler technology, specifically a condensing boiler with a control box. Background Technology

[0002] Condensing boilers are currently the mainstream high-efficiency and energy-saving heating equipment on the market. Unlike traditional conventional combustion boilers, these devices rely on a built-in condensing heat exchange core structure to fully recover the latent heat released during the condensation of water vapor inside the high-temperature flue gas, achieving secondary recovery and utilization of flue gas waste heat. This effectively breaks through the thermal efficiency limitations of traditional boilers and significantly improves the overall heat exchange utilization rate. Most condensing boilers on the market currently adopt a closed-box integrated structure. The internal heat exchange components, fan components, control components, and piping fittings are completely enclosed in a single sealed shell, providing comprehensive protection for the core precision components and effectively isolating them from external dust, moisture, and impacts.

[0003] For example, an integrated condensing boiler with publication number CN102331085A utilizes a fully premixed flameless burner burning oil and gas fuel for radiative heat exchange in the furnace chamber, and uses plate-fin heat transfer elements for overall convection and condensation heat exchange. Welded pins or cast bosses are directly inserted into the mainstream temperature zone of the flue gas, effectively reducing the temperature gradient from the mainstream flue gas to the wall. At the same time, the condensate absorbs some of the harmful gases such as CO2, NOx, and SOx in the flue gas, effectively reducing pollutant emissions. This boiler has a compact structure, high overall convection and condensation heat transfer coefficients, and maximizes the thermal energy conversion efficiency.

[0004] While the above solution maximizes thermal energy conversion efficiency, the current method requires operators to manually turn on the lighting equipment beforehand to meet internal lighting needs during maintenance of the boiler's internal controller box, and then manually turn it off after maintenance, making the process cumbersome. In practical applications, traditional lighting control relies on manual operation and cannot adaptively switch lighting status according to the unlocking and locking states of the maintenance door. It also cannot achieve automated adaptation for turning on lights during maintenance and turning them off upon reset. Its adaptability and practicality are poor, making it unsuitable for the frequent maintenance and long-term operation of condensing boilers, resulting in limitations and energy waste. Summary of the Invention

[0005] To address the problems mentioned in the background section, the present invention provides a condensing boiler with a control box.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a condensing boiler with a control box, comprising a boiler equipment box body, a sliding maintenance door panel slidably connected to the front end of the boiler equipment box body, and further comprising: a plug-in locking assembly for assembling the boiler equipment box body and the sliding maintenance door panel; a controller box fixedly connected to the lower inner wall of the boiler equipment box body; inspection and maintenance lighting assemblies located on both sides of the controller box and used for inspection and maintenance lighting are provided in the boiler equipment box body; and a mechanical trigger linkage assembly for realizing mechanical linkage start and stop lighting is provided between the plug-in locking assembly and the inspection and maintenance lighting assembly.

[0007] The plug-in locking assembly includes four lateral fixed supports fixedly connected to the side wall of the boiler equipment box body. One end of each lateral fixed support is fixedly connected to a telescopic guide rod. A synchronous control crossbar for synchronous push-pull operation is fixedly connected between two horizontally corresponding telescopic guide rods. Locking pins are symmetrically fixedly connected to both sides of the synchronous control crossbar near the boiler equipment box body. Multiple sets of locking positioning holes for aligning and plugging with the locking pins are respectively opened in the boiler equipment box body and the sliding maintenance door panel.

[0008] The inspection and repair lighting assembly includes vertical supplementary light strips symmetrically arranged on both sides of the controller box. The lower end of each vertical supplementary light strip is fixedly connected to a vertical mounting bracket. A switch for controlling the on / off state of the lighting is fixedly connected to one side of the vertical mounting bracket. The mechanical trigger linkage assembly includes linkage assembly slots opened in two locking positioning holes located on the lower side. An annular fixing base is fixedly connected to the end of the linkage assembly slot away from the locking pin. An elastic push slider is elastically connected to the end of the annular fixing base near the locking pin. A horizontal connecting plate is fixedly connected to one side of the elastic push slider.

[0009] Preferably, a flexible trigger plate is fixedly connected to the end of the horizontal connecting plate away from the elastic push slider, the lower end of the vertical mounting bracket extends into the linkage assembly groove, and the flexible trigger plate and the switch are located on the same horizontal axis.

[0010] Preferably, the locking pin is fixedly connected to a tapered guide end at one end near the main body of the boiler equipment box, and the multiple sets of locking positioning holes are respectively distributed in a rectangular shape and correspond horizontally with the positions of the multiple tapered guide ends to achieve multi-point uniform locking and fixing.

[0011] Preferably, the inner wall of the locking positioning hole is a smooth cylindrical surface, and the diameter of the locking positioning hole is clearance-fitted with the outer diameter of the locking pin.

[0012] Preferably, alignment calibration strips are fixedly connected to the two locking positioning holes located below and the front side of the boiler equipment box body, respectively. The alignment calibration strips are long strip-shaped rubber sheets used to provide visual alignment markings.

[0013] Preferably, the telescopic guide rod is a multi-section sleeve rod made of stainless steel, and both ends of the telescopic guide rod are welded and fixed to the lateral fixed support and the synchronous control crossbar, respectively.

[0014] Preferably, the vertical supplementary light strip is an LED light strip, and the vertical supplementary light strip is vertically attached to the inner wall of the boiler equipment box body along the height direction of the controller box.

[0015] Preferably, the elastic push slider is a cylindrical rubber block, and the elastic push slider and the annular fixed base are elastically connected by a helical compression spring.

[0016] Preferably, the flexible trigger sheet is an arc-shaped elastic plastic sheet, and the arc-shaped convex surface of the flexible trigger sheet is positioned facing the switch to buffer hard contact force.

[0017] Preferably, the switch is a normally open micro switch, and the switch contacts are oriented toward the flexible trigger plate.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] This invention utilizes a combination of a locking and plugging component, a mechanical trigger linkage component, and a repair and maintenance lighting component. It relies on the insertion and removal of the lower locking pin and the elastic deformation of the elastic push slider to form a purely mechanical linkage logic. When the equipment is normally locked, the repair and maintenance lighting component remains off. When the locking pin is removed for repair and maintenance, the elastic push slider automatically resets and pushes the flexible trigger plate to touch the switch, automatically turning on the lighting. After the locking pin is reinstalled for repair and maintenance, the elastic push slider can be squeezed again to turn off the lighting. The entire process requires no manual operation of the lighting switch, automatically completing the lighting start-stop switching and significantly improving the energy efficiency of the equipment.

[0020] This invention utilizes a structural combination of two sets of synchronously controlled crossbars, telescopic guide rods, locking positioning holes, a boiler equipment box body, a sliding maintenance door panel, and alignment calibration strips. By employing a dual-station assembly structure with synchronous unlocking of the upper and lower synchronously controlled crossbars and high-position locking of a single synchronously controlled crossbar, it can switch between two working states: low-position sealing and locking, and high-position suspended fixation of the sliding maintenance door panel. After unlocking, the sliding maintenance door panel can smoothly slide upwards along the equipment box, achieving precise hole alignment with the alignment calibration strip, and quickly locking and fixing via the upper synchronously controlled crossbar, thus stabilizing the rectangular maintenance area exposed outside the controller box. The maintenance operation steps are simple. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the boiler equipment box of the present invention;

[0022] Figure 2This is a schematic diagram of the internal structure of the boiler equipment box of the present invention;

[0023] Figure 3 This is a partial cross-sectional view of the main body of the boiler equipment box of the present invention;

[0024] Figure 4 This is a schematic diagram of the repair and maintenance optical component structure of the present invention;

[0025] Figure 5 This is a schematic diagram of the vertical mounting bracket structure of the present invention;

[0026] Figure 6 This is a schematic diagram of the linkage assembly groove structure of the present invention.

[0027] In the diagram: 1. Boiler equipment box body; 2. Sliding maintenance door panel; 3. Plug-in locking assembly; 300. Lateral fixed support; 301. Telescopic guide rod; 302. Synchronous control crossbar; 303. Locking pin; 304. Conical guide end; 305. Locking positioning hole; 4. Controller box; 5. Maintenance and lighting assembly; 500. Vertical supplementary lighting strip; 501. Vertical mounting bracket; 502. Switch; 6. Mechanical trigger linkage assembly; 600. Annular fixed base; 601. Elastic push slider; 602. Horizontal connecting plate; 603. Flexible trigger piece; 604. Linkage assembly slot; 7. Alignment calibration mark strip. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] like Figures 1 to 6As shown, the present invention provides a condensing boiler with a control box, including a boiler equipment box body 1, a sliding maintenance door 2 slidably connected to the front end of the boiler equipment box body 1, and further including: a plug-in locking assembly 3 for assembling the boiler equipment box body 1 and the sliding maintenance door 2; a controller box 4 fixedly connected to the lower inner wall of the boiler equipment box body 1; maintenance lighting assemblies 5 located on both sides of the controller box 4 and used for maintenance lighting, disposed in the boiler equipment box body 1; and a mechanical trigger linkage assembly 6 for realizing mechanical linkage to start and stop the lighting, disposed between the plug-in locking assembly 3 and the maintenance lighting assembly 5. The plug-in locking assembly 3 includes four lateral fixed supports 300 fixedly connected to the side wall of the boiler equipment box body 1. One end of each lateral fixed support 300 is fixedly connected to a telescopic guide rod 301. A synchronous control crossbar 302 for synchronous push-pull operation is fixedly connected between two horizontally corresponding telescopic guide rods 301. Locking pins 303 are symmetrically fixedly connected on both sides of the synchronous control crossbar 302 near the boiler equipment box body 1. Multiple sets of locking positioning holes 305 for aligning and inserting with the locking pins 303 are respectively opened in the boiler equipment box body 1 and the sliding maintenance door panel 2.

[0030] The above-mentioned solution employs a distributed symmetrical assembly structure for the plug-in locking assembly 3. Four sets of lateral fixed supports 300 are arranged at the four corners of a rectangle, evenly distributing the loads from the telescopic guide rod 301 and the synchronous control crossbar 302. This completely avoids structural skewing and loosening caused by single-point stress, ensuring a unified overall assembly standard and higher structural coaxiality and stability. The two independent sets of synchronous control crossbars 302 can respectively achieve dual-position switching functions for low-level sealing locking and high-level maintenance positioning, eliminating the need for additional positioning accessories.

[0031] like Figures 2 to 6As shown, the supplementary lighting assembly 5 includes vertical supplementary lighting strips 500 symmetrically arranged on both sides of the controller box 4. A vertical mounting bracket 501 is fixedly connected to the lower end of each vertical supplementary lighting strip 500. A switch 502 for controlling the on / off state of the lighting is fixedly connected to one side of the vertical mounting bracket 501. The mechanical trigger linkage assembly 6 includes a linkage assembly groove 604 formed in two locking positioning holes 305 located on the lower side. An annular fixing base 600 is fixedly connected to the end of the linkage assembly groove 604 away from the locking pin 303. An elastic push slider 6 is elastically connected to the end of the annular fixing base 600 near the locking pin 303. 01. A horizontal connecting plate 602 is fixedly connected to one side of the elastic push slider 601. A flexible trigger plate 603 is fixedly connected to the end of the horizontal connecting plate 602 away from the elastic push slider 601. The lower end of the vertical mounting bracket 501 extends into the linkage assembly groove 604. The flexible trigger plate 603 and the switch 502 are located on the same horizontal axis. A tapered guide end 304 is fixedly connected to the end of the locking pin 303 near the boiler equipment box body 1. Multiple sets of locking positioning holes 305 are distributed in a rectangular shape and correspond horizontally with the positions of multiple tapered guide ends 304 to achieve multi-point uniform locking and fixing.

[0032] The above solution is adopted: the inspection and repair lighting component 5 and the mechanical trigger linkage component 6 are integrated and arranged in an integrated manner. The linkage triggering structure is embedded in the linkage assembly slot 604 inside the locking positioning hole 305, which does not occupy additional installation space inside the equipment. The flexible trigger piece 603 and the switch 502 are arranged coaxially and correspondingly, which can ensure the accuracy of mechanical displacement triggering. At the same time, relying on the elastic deformation characteristics of the elastic push slider 601, the mechanical linkage start and stop lighting is realized.

[0033] like Figures 2 to 6 As shown, the inner wall of the locking positioning hole 305 is a smooth cylindrical surface, and the diameter of the locking positioning hole 305 is clearance-fitted with the outer diameter of the locking pin 303. Alignment calibration strips 7 are fixedly connected to the side ends of the two lower locking positioning holes 305 and the front side of the boiler equipment box body 1, respectively. The alignment calibration strips 7 are long strip-shaped rubber sheets used to provide visual alignment markings. The telescopic guide rod 301 is a multi-section sleeve rod made of stainless steel, and both ends of the telescopic guide rod 301 are welded and fixed to the lateral fixed support 300 and the synchronous control crossbar 302, respectively. A vertical supplementary light strip 5... 00 is an LED light strip, and the vertical supplementary light strip 500 is vertically pasted to the inner wall of the boiler equipment box body 1 along the height direction of the controller box 4. The elastic push slider 601 is a cylindrical rubber block, and the elastic push slider 601 and the annular fixed base 600 are elastically connected by a spiral compression spring. The flexible trigger piece 603 is an arc-shaped elastic plastic piece, and the arc-shaped convex surface of the flexible trigger piece 603 is set towards the position of the switch 502 to buffer the hard contact force. The switch 502 is a normally open micro switch, and the contact of the switch 502 is set towards the direction of the flexible trigger piece 603.

[0034] The above solution is adopted: the elastic push slider 601 is used in combination with a 304 stainless steel spiral compression spring. The spring has excellent corrosion resistance and elastic recovery performance, which can ensure long-term repeated deformation without fatigue failure, and stably realize the cyclic action of compression and self-reset. The vertically arranged LED light strip can realize full-area supplementary lighting without dead angles on both sides of the controller box 4.

[0035] Working principle and usage process of this invention:

[0036] During normal operation, the four sets of lateral fixed supports 300 on the side wall of the boiler equipment box body 1 respectively support and fix the telescopic guide rods 301 at corresponding positions. The two sets of horizontally arranged synchronous control crossbars 302 maintain the initial locking position. The locking pins 303 connected to both ends of the synchronous control crossbars 302 drive the conical guide ends 304 to be inserted into the locking positioning holes 305 of the boiler equipment box body 1 and the sliding maintenance door 2, thereby realizing the closed locking of the sliding maintenance door 2 and the boiler equipment box body 1. In the linkage assembly groove 604 opened inside the lower locking positioning hole 305, the annular fixed base 600 limits and supports the elastic push slider 601. When the locking pin 303 is fully inserted into the locking positioning hole 305, it will continuously squeeze the elastic push slider 601, causing the elastic push slider 601 to remain in a contracted deformation state. After deformation, the elastic push slider 601 is pulled by the horizontal connecting plate 602 to keep the flexible trigger piece 603 away from the switch 502. The vertical supplementary light strip 500 of the inspection and repair light assembly 5 is in a power-off and extinguished state. The controller box 4 is sealed and stored in the lower inner wall of the boiler equipment box body 1. The whole set of equipment adopts a pure mechanical integrated linkage structure, without the need for additional electrical control induction accessories. The number of structural parts is small, the processing and assembly process is simple, and the overall production and manufacturing cost of the equipment can be effectively reduced.

[0037] When maintenance work is required on the controller box 4, the upper and lower sets of synchronous control levers 302 are pulled simultaneously. The synchronous control levers 302 will drive the telescopic guide rods 301 on both sides to retract inward along the lateral fixed support 300, thereby driving all locking pins 303 and tapered guide ends 304 to be pulled out from the corresponding locking positioning holes 305 at the same time, completely releasing the locking limit between the sliding maintenance door panel 2 and the boiler equipment box body 1. After the lower locking pin 303 is completely withdrawn from the locking positioning hole 305, the elastic push slider 601, which was originally squeezed and compressed, loses the external squeezing force and then stretches and resets by its own elastic potential energy. After the reset elastic push slider 601 will push the flexible trigger piece 603 to move laterally through the horizontal connecting plate 602. The flexible trigger piece 603 after displacement can directly contact the touch switch 502, thereby triggering the maintenance lighting component 5 to connect the power supply circuit. The vertical supplementary light strips 500 on both sides will light up simultaneously, which can provide sufficient lighting light for the subsequent maintenance operation of the controller box 4.

[0038] After unlocking, slide the sliding maintenance door 2 upward along the front end of the boiler equipment box body 1 to make the sliding maintenance door 2 slide and align with the assembly position of the upper synchronous control bar 302. The alignment and calibration mark strip 7 can help the operator to accurately complete the hole alignment and calibration. Then push the upper synchronous control bar 302 to reset, so that the upper locking pin 303 and the conical guide end 304 are re-inserted into the locking positioning hole 305 corresponding to the sliding maintenance door 2 and the boiler equipment box body 1. In this way, the sliding maintenance door 2 is fixed in the high maintenance position. After the sliding maintenance door 2 is moved and fixed, the rectangular maintenance area outside the controller box 4 can be directly exposed. The structure does not require disassembly and replacement of parts, and the maintenance operation is convenient, which can further reduce the later maintenance cost of the equipment.

[0039] Throughout the maintenance operation, the illuminated vertical supplementary lighting strip 500 continuously covers both sides of the controller box 4, ensuring that operators can clearly observe the internal structure of the equipment and smoothly complete maintenance, debugging, troubleshooting, and other related tasks. After the maintenance operation is completed, the upper synchronous control lever 302 is pulled again to release the high-position lock, and the sliding maintenance door panel 2 is slid down to reset to the initial low position. Then, the upper and lower synchronous control levers 302 are pushed simultaneously to complete the reset, allowing the locking pins 303 and the conical guide ends 304 in the upper and lower positions to be re-inserted into the corresponding locking positioning holes 305. During the insertion of the lower locking pin 303, the elastic push slider 601 inside the linkage assembly slot 604 will be squeezed again, causing the elastic push slider 601 to contract and deform again. The deformed elastic push slider 601 simultaneously drives the horizontal connecting plate 602 and the flexible trigger piece 603 to move in opposite directions, so that the flexible trigger piece 603 quickly disengages from the switch 502. The power supply circuit of the inspection and repair light assembly 5 is immediately disconnected, and the vertical supplementary light strip 500 is automatically turned off. This can effectively avoid the waste of electricity caused by the long-term no-load lighting of the lighting equipment, and improve the energy efficiency and economic use of the equipment.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A condensing boiler with a control box, comprising a boiler equipment box body (1), wherein a sliding maintenance door (2) is slidably connected to the front end of the boiler equipment box body (1), characterized in that: Also includes: A plug-in locking assembly (3) is used to assemble the boiler equipment box body (1) and the sliding maintenance door (2). A controller box (4) is fixedly connected to the lower inner wall of the boiler equipment box body (1). An inspection and maintenance lighting assembly (5) is provided in the boiler equipment box body (1) on both sides of the controller box (4) for inspection and maintenance lighting. A mechanical trigger linkage assembly (6) for realizing mechanical linkage start and stop lighting is provided between the plug-in locking assembly (3) and the inspection and maintenance lighting assembly (5). The plug-in locking assembly (3) includes four lateral fixed supports (300) fixedly connected to the side wall of the boiler equipment box body (1). One end of each lateral fixed support (300) is fixedly connected to a telescopic guide rod (301). A synchronous control crossbar (302) for synchronous push-pull operation is fixedly connected between two horizontally corresponding telescopic guide rods (301). Locking pins (303) are symmetrically fixedly connected on both sides of the synchronous control crossbar (302) near the boiler equipment box body (1). Multiple sets of locking positioning holes (305) for matching and plugging with the locking pins (303) are respectively opened in the boiler equipment box body (1) and the sliding maintenance door panel (2). The inspection and repair lighting assembly (5) includes vertical supplementary light strips (500) symmetrically arranged on both sides of the controller box (4). The lower end of the vertical supplementary light strip (500) is fixedly connected to a vertical mounting bracket (501). A switch (502) for controlling the on / off of lighting is fixedly connected to one side of the vertical mounting bracket (501). The mechanical trigger linkage assembly (6) includes a linkage assembly groove (604) opened in two locking positioning holes (305) located on the lower side. An annular fixing base (600) is fixedly connected to one end of the linkage assembly groove (604) away from the locking pin (303). An elastic push slider (601) is elastically connected to one end of the annular fixing base (600) near the locking pin (303). A horizontal connecting plate (602) is fixedly connected to one side of the elastic push slider (601). A flexible trigger piece (603) is fixedly connected to one end of the horizontal connecting plate (602) away from the elastic push slider (601).

2. The condensing boiler with a control box according to claim 1, characterized in that: The lower end of the vertical mounting bracket (501) extends into the linkage assembly groove (604), and the flexible trigger piece (603) and the switch (502) are located on the same horizontal axis.

3. The condensing boiler with a control box according to claim 1, characterized in that: The locking pin (303) is fixedly connected to a tapered guide end (304) at one end near the main body (1) of the boiler equipment box. Multiple sets of locking positioning holes (305) are distributed in a rectangular shape and correspond horizontally with the positions of multiple tapered guide ends (304) to achieve multi-point uniform locking and fixing.

4. The condensing boiler with a control box according to claim 1, characterized in that: The inner wall of the locking positioning hole (305) is a smooth cylindrical surface, and the diameter of the locking positioning hole (305) is clearance-fitted with the outer diameter of the locking pin (303).

5. The condensing boiler with a control box according to claim 1, characterized in that: The two locking positioning holes (305) located below and the front side of the boiler equipment box body (1) are respectively fixedly connected with alignment calibration mark strips (7). The alignment calibration mark strips (7) are long strip rubber pieces used to provide visual alignment marks.

6. The condensing boiler with a control box according to claim 1, characterized in that: The telescopic guide rod (301) is a multi-section sleeve rod made of stainless steel, and the two ends of the telescopic guide rod (301) are welded and fixed to the lateral fixed support (300) and the synchronous control crossbar (302) respectively.

7. The condensing boiler with a control box according to claim 1, characterized in that: The vertical supplementary light strip (500) is an LED light strip, and the vertical supplementary light strip (500) is vertically pasted on the inner wall of the boiler equipment box body (1) along the height direction of the controller box (4).

8. The condensing boiler with a control box according to claim 1, characterized in that: The elastic push slider (601) is a cylindrical rubber block, and the elastic push slider (601) and the annular fixed base (600) are elastically connected by a spiral compression spring.

9. The condensing boiler with a control box according to claim 2, characterized in that: The flexible trigger piece (603) is an arc-shaped elastic plastic sheet, and the arc-shaped convex surface of the flexible trigger piece (603) is positioned facing the switch (502) to buffer the hard contact force.

10. The condensing boiler with a control box according to claim 1, characterized in that: The switch (502) is a normally open micro switch, and the contacts of the switch (502) are arranged in the direction of the flexible trigger piece (603).

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