Air pressure taking pipe and gas water heating equipment

Abstract

The utility model relates to the technical field of water heating equipment, and discloses an air pressure taking pipe and gas water heating equipment. The wind pressure pipeline comprises a wind pressure inner pipe and a wind pressure outer pipe, the wind pressure outer pipe is arranged outside the wind pressure inner pipe in a sleeving mode, a closed heat insulation cavity is formed between the wind pressure outer pipe and the wind pressure inner pipe, one end of the wind pressure inner pipe is communicated with the pressure tapping opening of the fan, and the other end of the wind pressure inner pipe is communicated with the wind pressure switch. By adopting the double-layer pipeline design of the wind pressure outer pipe and the wind pressure inner pipe, on one hand, external air is structurally prevented from being in direct contact with the wind pressure inner pipe, and on the other hand, heat insulation between high-temperature airflow in the wind pressure inner pipe and external low-temperature air is achieved through the heat insulation cavity in the aspect of heat transfer; the temperature difference between the inner pipe wall and the outer pipe wall of the wind pressure inner pipe is reduced, and therefore the wind pressure taking pipe can effectively restrain generation of condensate water on the inner wall of the wind pressure inner pipe, further reduces generation of the condensate water, and guarantees normal work of the wind pressure taking pipe.

Description

Technical Field

[0001] This utility model relates to the field of hot water equipment technology, specifically to air pressure pipes and gas-fired hot water equipment. Background Technology

[0002] Gas-fired water heaters heat water flowing through a heat exchanger using high-temperature flue gas. This process requires expelling combustion gases and drawing in fresh air to maintain continuous combustion. This process relies on a fan, whose operating status is monitored by a pressure switch. Both the fan outlet and the pressure switch have positive and negative pressure connections at the venturi tube. The fan and pressure switch are connected by a pressure pipe. When the fan is running, the generated air pressure is transmitted to the pressure switch, causing it to close, thus confirming that the fan is operating normally. Conversely, if the pressure switch is open, it indicates that the fan is not operating normally, and the gas-fired water heater will display a fault message.

[0003] However, in actual use, the significant temperature difference between the high-temperature flue gas and the outside air causes excessive condensation to form inside the air pressure duct. Specifically, when the high-temperature flue gas enters the air pressure duct through the fan outlet, it encounters the relatively cold ambient temperature, causing water vapor in the gas to condense into water droplets on the inner wall of the air pressure duct. This condensation not only affects the airflow characteristics inside the air pressure duct but may also affect the accurate transmission of the air pressure signal, thus reducing the accuracy of the air pressure switch's judgment of the fan status. This can lead to incorrect judgments of abnormal fan status, causing the gas water heater to malfunction and affecting the normal operation of the equipment. Utility Model Content

[0004] The first technical problem solved by this utility model is to provide a pressure pipe that effectively solves the problem in related technologies where excessive condensate is generated in the pressure pipe due to large temperature differences, thereby reducing the accuracy of the pressure switch in judging the fan status.

[0005] The second technical problem solved by this utility model is to provide a gas-fired water heater that effectively solves the problem in traditional gas-fired water heaters where excessive condensate is generated in the air pressure pipe due to large temperature differences, thereby reducing the accuracy of the air pressure switch in judging the fan status.

[0006] The first technical problem mentioned above is solved by the following technical solution:

[0007] A pressure intake pipe, comprising:

[0008] A wind pressure duct, comprising an inner wind pressure pipe and an outer wind pressure pipe, wherein the outer wind pressure pipe is sleeved outside the inner wind pressure pipe, and a sealed heat insulation cavity is provided between the inner wall of the outer wind pressure pipe and the outer wall of the inner wind pressure pipe.

[0009] One end of the inner air pressure pipe is used to connect to the pressure tap of the fan of the gas water heater, and the other end is used to connect to the air pressure switch.

[0010] Compared with the prior art, the air pressure intake pipe of this utility model has the following beneficial effects: This utility model provides an air pressure intake pipe. This component employs a double-layer pipe design with an outer air pressure pipe and an inner air pressure pipe. Structurally, this prevents outside air from directly contacting the outer wall of the inner air pressure pipe. Furthermore, in terms of heat transfer, the sealed insulated cavity achieves heat insulation between the high-temperature airflow inside the inner air pressure pipe and the low-temperature outside air, reducing the temperature difference between the inner and outer pipe walls. Therefore, this utility model's component can effectively suppress the formation of condensate on the inner wall of the inner air pressure pipe, thereby reducing condensate formation and ensuring the normal operation of the air pressure intake pipe. In addition, because the air pressure intake pipe of this utility model can suppress condensate formation, the reduced condensate formation allows the air pressure signal to be transmitted more stably and accurately to the air pressure switch, ensuring that the air pressure switch can correctly sense the fan's operating status, thus improving the reliability and stability of the entire system. Simultaneously, by solving the problem of false alarms caused by condensate formation, this utility model can reduce unnecessary maintenance and downtime of gas water heating equipment, thereby improving the user experience.

[0011] In one embodiment, a support member is provided between the outer air pressure pipe and the inner air pressure pipe, located in the heat insulation cavity. One end of the support member abuts against the inner wall of the outer air pressure pipe, and the other end abuts against the outer wall of the inner air pressure pipe.

[0012] In one embodiment, the support member is integrally formed with the outer air pressure pipe, or the support member is integrally formed with the inner air pressure pipe.

[0013] In one embodiment, the support member is a support ring; the support ring is arranged around the outer peripheral wall of the inner air pressure pipe, and / or, there are multiple support rings, and the multiple support rings are spaced apart along the axial direction of the air pressure pipe.

[0014] In one embodiment, the air pressure intake pipe further includes:

[0015] A connecting seat is installed at one end of the air pressure pipe for connection with the fan. The connecting seat has a drainage cavity and a drainage hole. The air pressure inner pipe is connected to the fan pressure tap through the drainage cavity, and the drainage cavity is connected to the outside of the connecting seat through the drainage hole.

[0016] In one embodiment, the connecting seat includes a seat body and a plug. The seat body is a hollow tube with open ends. One end of the seat body is installed in the air pressure pipe, and the opposite end is provided with a removable plug.

[0017] The drain hole is formed on the plug.

[0018] In one embodiment, the end of the plug facing the drainage cavity is formed with a water guiding slope, which is gradually inclined from its top to its bottom in a direction away from the air pressure pipe.

[0019] The drain hole is located at the bottom of the water guide slope and extends through the plug.

[0020] In one embodiment, a pressure tapping connector is also included. A plug hole is provided on the side wall of the base. One end of the pressure tapping connector passes through the plug hole and extends into the drainage chamber. The other end of the pressure tapping connector is used to connect to the pressure tapping port of the fan.

[0021] Along the vertical direction, the end of the pressure tapping connector located inside the drainage chamber is positioned higher than the drainage hole, and the interface between the base and the inner air pressure pipe is positioned higher than the drainage hole.

[0022] In one embodiment, the end wall of the seat is embedded between the inner air pressure pipe and the outer air pressure pipe and seals one end of the heat insulation cavity;

[0023] And / or, it also includes a switch connector, the two ends of which are respectively connected to the air pressure pipe and the air pressure switch, and an annular sealing plate is provided on the outer peripheral wall of the end of the switch connector adjacent to the air pressure pipe, the annular sealing plate cooperating with the air pressure outer pipe and sealing the other end of the heat insulation cavity.

[0024] The second technical problem mentioned above is solved by the following technical solution:

[0025] A gas-fired water heater includes:

[0026] Fan and air pressure switch;

[0027] As described in the first aspect of the present invention, the pressure pipe has one end connected to the pressure tap of the fan and the other end connected to the pressure switch.

[0028] Compared with the prior art, the gas-fired water heater of the present invention has the following advantages: By integrating the air pressure pipe of the first aspect embodiment, the gas-fired water heater of the second aspect embodiment can not only effectively suppress the generation of condensate on the inner wall of the air pressure pipe, thereby reducing the generation of condensate and ensuring the normal operation of the air pressure switch of the air pressure pipe, but also significantly improve the stability and reliability of the system, extend the service life of the equipment, and enhance the user experience. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a partial structural schematic diagram of a gas-fired water heater according to an embodiment of the present utility model;

[0031] Figure 2 for Figure 1 The diagram shown is a structural schematic of the air intake pressure pipe;

[0032] Figure 3 for Figure 1 The cross-sectional view of the air pressure pipe shown;

[0033] Figure 4 for Figure 3 A magnified view of part A in the diagram;

[0034] Figure 5 for Figure 3 A magnified view of part B in the diagram.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Air pressure duct; 11. Inner air pressure duct; 12. Outer air pressure duct; 13. Insulation cavity; 2. Support components;

[0037] 3. Connecting seat; 31. Seat body; 32. Plug; 33. Water guide slope; 34. Drainage chamber; 35. Drainage hole; 4. Pressure tap; 5. Switch connector; 51. Annular sealing plate; 6. Air pressure switch; 7. Fan. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0039] In the description of the embodiments of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0040] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0041] The following description, with reference to the accompanying drawings, illustrates an air intake pressure pipe and a gas-fired water heater according to this utility model. It should be noted that the gas-fired water heater described in the second aspect of this utility model includes the air intake pressure pipe described in the first aspect of this utility model.

[0042] like Figures 1 to 5 As shown, the air pressure pipe according to the first aspect embodiment of the present invention includes an air pressure pipe 1.

[0043] The air pressure duct 1 includes an inner air pressure pipe 11 and an outer air pressure pipe 12. The outer air pressure pipe 12 is sleeved outside the inner air pressure pipe 11, and a sealed heat-insulating cavity 13 is provided between the inner wall of the outer air pressure pipe 12 and the outer wall of the inner air pressure pipe 11. One end of the inner air pressure pipe 11 is used to connect to the pressure tap of the fan 7 of the gas water heater, and the other end of the inner air pressure pipe 11 is used to connect to the air pressure switch 6.

[0044] According to an embodiment of this utility model, the pressure-taking pipe is connected to both the fan 7 and the pressure switch 6. Its purpose is to connect the fan 7 and the pressure switch 6, and to draw flue gas from the pressure port of the fan 7 and deliver it to the pressure switch 6, thereby allowing the pressure switch 6 to monitor the operating status of the fan 7 in real time. The pressure-taking pipe 1 is composed of an inner pressure pipe 11 and an outer pressure pipe 12 nested together.

[0045] Specifically, the inner pressure pipe 11 is located inside the pressure pipe 1, and its internal pipe space is directly connected to the fan 7 and the pressure switch 6 of the gas water heater. The inner pressure pipe 11 enables airflow transmission, ensuring that gas can flow smoothly from the fan 7 to the pressure switch 6. Preferably, the inner pressure pipe 11 can be made of heat-resistant material, thus facilitating the handling of high-temperature gas generated by the gas water heater.

[0046] The outer air pressure pipe 12 is a protective layer fitted over the inner air pressure pipe 11. The main function of the outer air pressure pipe 12 is to provide physical protection and reduce heat loss. It can be understood that since a closed heat insulation cavity 13 is formed between the outer air pressure pipe 12 and the inner air pressure pipe 11, the heat insulation cavity 13 can effectively isolate the temperature difference between the inside and outside environment, thereby enhancing the heat insulation capacity of the entire air pressure pipe 1.

[0047] The inner air pressure pipe 11 and the outer air pressure pipe 12 are spaced apart, and the heat insulation cavity 13 is located in the space between the inner air pressure pipe 11 and the outer air pressure pipe 12. It can be understood that the heat insulation cavity 13 formed between the two not only enhances the overall strength of the pipeline but also greatly improves the heat insulation capacity of the entire air pressure pipeline 1, thereby reducing the generation of condensate on the inner wall of the inner air pressure pipe 11 and ensuring the smooth flow of air within the inner air pressure pipe 11 during air transmission. Furthermore, the heat insulation cavity 13 can achieve a stronger heat insulation effect by filling it with heat insulation material or by vacuum design, thereby further enhancing the heat insulation capacity and reducing the generation of condensate inside the inner air pressure pipe 11.

[0048] Based on the above description of the specific structure, the general working principle of the air pressure pipe of this utility model is as follows: This utility model adopts a double-layer pipe design, that is, a sealed heat-insulating cavity 13 is set between the inner air pressure pipe 11 and the outer air pressure pipe 12. On the one hand, the external humid space directly contacts the outer air pressure pipe 12. Under the isolation effect of the outer air pressure pipe 12 and the heat-insulating cavity 13, the external humid air can be prevented from directly contacting the inner air pressure pipe 11. On the other hand, the heat-insulating cavity 13 can achieve heat insulation between the high-temperature gas inside the inner air pressure pipe 11 and the low-temperature air outside, thereby reducing the temperature difference between the inner and outer pipes of the inner air pressure pipe. In this way, the above two aspects work together to effectively suppress the formation of condensate on the inner wall of the inner air pressure pipe 11.

[0049] It should also be noted that the design of the insulation cavity 13 not only helps prevent condensation but also improves the overall insulation performance and reduces heat loss. This ensures that the airflow from the fan 7 to the pressure switch 6 remains within a relatively stable temperature range, thereby improving the overall energy efficiency ratio of the gas-fired water heater. Furthermore, due to these measures, the entire air pressure intake pipe can maintain stable operation under different environmental conditions (such as changes in temperature and humidity), ensuring the safety and reliability of the gas-fired water heater.

[0050] In related technologies, gas-fired heating and hot water boilers heat water flowing through a heat exchanger using high-temperature flue gas. To maintain the continuity of the combustion process, it is necessary to exhaust the flue gas produced by combustion and draw in fresh air; this process relies on the action of a fan. The operating status of the fan is monitored by a pressure switch to ensure its normal operation. Specifically, a Venturi tube is installed at the fan outlet, with positive and negative pressure connectors that connect to corresponding connectors on the pressure switch. When the fan is running, the generated air pressure is transmitted to the pressure switch, causing it to close, confirming that the fan is in normal operating condition; conversely, if the pressure switch is open, it indicates that the fan is not operating normally, and the gas-fired heating and hot water boiler will display a fault message.

[0051] However, in actual use, the significant temperature difference between the high-temperature flue gas and the outside air easily leads to condensation inside the air pressure duct. Specifically, when the high-temperature flue gas enters the air pressure duct through the fan outlet, it encounters the relatively cold ambient temperature, causing water vapor in the gas to condense into water droplets on the inner wall of the air pressure duct. The formation of condensate not only affects the airflow characteristics inside the air pressure duct but may also affect the accurate transmission of the air pressure signal, thus impacting the accuracy of the air pressure switch's judgment of the fan status. Furthermore, the presence of condensate may cause the air pressure switch to fail to correctly detect changes in air pressure, resulting in an incorrect judgment of the fan status as abnormal, causing the gas-fired heating and hot water boiler to report a fault, affecting the normal operation of the equipment and user satisfaction.

[0052] In summary, to address the technical deficiencies in the aforementioned related technologies, this utility model provides a pressure pipe. This component employs a double-layer pipe design with an outer pressure pipe 12 and an inner pressure pipe 11. On the one hand, structurally, it prevents outside air from directly contacting the inner pressure pipe 11. On the other hand, in terms of heat transfer, the heat insulation cavity 13 achieves heat insulation between the high-temperature airflow inside the inner pressure pipe 11 and the low-temperature outside air, reducing the temperature difference between the inner and outer pipe walls of the inner pressure pipe. As a result, the component of this utility model can effectively suppress the formation of condensate on the inner wall of the inner pressure pipe 11, thereby reducing condensate formation and ensuring the normal operation of the pressure switch.

[0053] Furthermore, because the air pressure pipe of this invention can suppress the generation of condensate, the reduction in condensate generation allows the air pressure signal to be transmitted to the air pressure switch 6 more stably and accurately. This ensures that the air pressure switch 6 can correctly sense the working status of the fan 7, improving the reliability and stability of the entire system. At the same time, by solving the problem of false alarms caused by condensate generation, this invention can reduce unnecessary maintenance and downtime, thereby improving the user experience.

[0054] like Figure 3 and Figure 4As shown, according to some embodiments of the present invention, a support member 2 is provided between the outer air pressure pipe 12 and the inner air pressure pipe 11 in the heat insulation cavity 13. One end of the support member 2 abuts against the inner wall of the outer air pressure pipe 12, and the other end abuts against the outer wall of the inner air pressure pipe 11.

[0055] It is understandable that the main function of the support component 2 is to provide additional mechanical support to ensure that the relative positions between the inner air pressure pipe 11 and the outer air pressure pipe 12 are fixed, and to prevent the pipes from deforming or being damaged due to external pressure, vibration and other factors. At the same time, the support component 2 can maintain a constant distance between the inner and outer pipes, which helps to maintain the spatial uniformity of the insulation cavity 13, thereby ensuring the consistency and effectiveness of the insulation effect.

[0056] The shape of the support component 2 can be designed according to specific needs, such as using a ring, strip, or other geometric shapes, to ensure that it can provide sufficient support without affecting airflow or heat insulation. Furthermore, the support component 2 can be made of materials with good heat resistance and mechanical strength to adapt to high temperature and high pressure working environments, such as stainless steel or aluminum alloy.

[0057] Thus, by introducing the support member 2 located within the insulation cavity 13, the above embodiment not only enhances the structural stability of the air pressure pipe and prevents the inner air pressure pipe 11 and the outer air pressure pipe 12 from sticking together due to bending deformation, but also further ensures the heat insulation performance of the insulation cavity 13. Furthermore, the effect of the support member 2 is even more pronounced when both the outer air pressure pipe 12 and the inner air pressure pipe 11 are made of soft materials (such as rubber).

[0058] like Figure 3 and Figure 4 As shown, the support member 2 is further integrally formed with the outer air pressure pipe 12 or the inner air pressure pipe 11. Thus, the above embodiment not only significantly improves the structural integrity and mechanical strength of the air pressure pipe, but also simplifies the manufacturing process and enhances thermal insulation performance.

[0059] For example, the support member 2 is integrally formed with the wind pressure outer pipe 12. In this case, the support member 2 is an annular protrusion structure set on the inner wall of the wind pressure outer pipe 12, and the end of the structure abuts against the outer peripheral wall of the wind pressure inner pipe 11.

[0060] For example, the support member 2 is integrally formed with the inner air pressure pipe 11. In this case, the support member 2 is an annular protrusion structure provided on the outer wall of the inner air pressure pipe 11, and the end of the structure abuts against the inner peripheral wall of the outer air pressure pipe 12.

[0061] like Figure 3 and Figure 4 As shown, according to some embodiments of the present invention, the support member 2 is a support ring, which is arranged around the outer peripheral wall of the inner wind pressure pipe 11.

[0062] In this embodiment, the support ring is a ring-shaped structure, the shape of which matches the outer peripheral wall of the inner air pressure pipe 11, and the inner and outer sides of the support ring can be tightly fitted to the outer peripheral wall of the inner air pressure pipe 11 and the inner peripheral wall of the outer air pressure pipe 12, respectively. The support ring can be a continuous, complete ring or a composite ring composed of multiple parts; this invention does not impose any special limitations on this.

[0063] Support rings are arranged around the inner air pressure pipe 11 at specific intervals along the length of the air pressure pipe 1. The number of support rings is not limited to one; there can be two or more support rings. These support rings are distributed within the insulation cavity 13 to ensure that the relative positions between the inner and outer pipes are fixed.

[0064] In this way, the support ring provides a uniformly distributed radial support force between the inner air pressure pipe 11 and the outer air pressure pipe 12, preventing them from deforming due to external pressure or vibration. It can effectively maintain a constant distance between the outer air pressure pipe 12 and the inner air pressure pipe 11, ensuring the spatial uniformity of the heat insulation cavity 13, thereby optimizing the heat insulation effect.

[0065] In addition, the design of the support ring increases the structural strength of the entire air intake pipe, reduces the risk of failure caused by external factors, and improves the reliability and durability of the system.

[0066] like Figure 3 and Figure 4 As shown, furthermore, there are multiple support rings, which are spaced apart along the axial direction of the air pressure duct 1. For example, multiple support rings are spaced apart and evenly distributed along the axial direction of the air pressure duct 1. In this way, the evenly distributed support rings can further reduce deformation caused by local stress concentration, help maintain the integrity of the heat insulation cavity 13, and further reduce the possibility of condensation.

[0067] like Figure 3 and Figure 5 As shown, according to some embodiments of the present invention, the air pressure pipe also includes a connecting seat 3.

[0068] Installed at one end of the air pressure pipe 1 for connection with the fan 7, the connecting seat 3 forms a drainage cavity 34 and a drainage hole 35. The air pressure inner pipe 11 is connected to the pressure tap of the fan 7 through the drainage cavity 34, and the drainage cavity 34 is connected to the outside of the connecting seat 3 through the drainage hole 35.

[0069] It is understood that the connector 3 not only serves a connecting function but also integrates a drainage function. A drainage chamber 34 is formed inside the connector 3, which communicates with the inner air pressure pipe 11 and is connected to the outside of the connector 3 through one or more drainage holes 35. Specifically, when condensate is generated in the inner air pressure pipe 11, the condensate can flow into the drainage chamber 34 of the connector 3, and the condensate accumulated in the drainage chamber 34 can be further discharged into the external environment through the drainage holes 35 on the connector 3, thereby preventing condensate from flowing back into the system.

[0070] In this way, the design of the drainage chamber 34 and the drainage hole 35 effectively solves the problem of condensate accumulation in the air pressure pipe 1, reduces the risk of blockage of the air pressure pipe 1 due to condensate accumulation, and ensures unobstructed airflow. In addition, since the connecting seat 3 integrates both connection and drainage functions, there is no need to install a complicated drainage system for the air pressure pipe, saving space and simplifying the installation process.

[0071] like Figure 3 and Figure 5 As shown, in some specific embodiments of this utility model, the connecting seat 3 includes a seat body 31 and a plug 32. The seat body 31 is a hollow tube with open ends. One end of the seat body 31 is installed at the end of the air pressure pipe 1 adjacent to the fan 7, and the opposite end is provided with a detachable plug 32. A drain hole 35 is formed on the plug 32.

[0072] In this embodiment, the connecting seat 3 consists of a seat body 31 and a plug 32. The seat body 31 is a hollow tube with open ends. It can be understood that the pipe space inside the tube forms a drainage chamber 34, and the two ends of the seat body 31 are respectively connected to the air pressure pipe 1 and the plug 32. The plug 32 is detachable. For example, the plug 32 can be fixed to the other end of the seat body 31 by threaded connection or other forms of quick connection device, which is convenient for disassembly and assembly for cleaning or maintenance.

[0073] In this way, on the one hand, since the drain hole 35 is located on the plug 32, it can ensure that the condensate flowing from the inner air pressure pipe 11 into the drain chamber 34 can be discharged smoothly, preventing the condensate from accumulating inside the system and avoiding malfunctions caused by moisture; on the other hand, the detachable design of the plug 32 facilitates regular inspection and cleaning of sediments or impurities in the drain chamber 34, ensuring unobstructed drainage.

[0074] Furthermore, in actual use, operators can replace the plugs 32 of different specifications (such as different sizes or numbers of drain holes 35) on the connector 3 according to the needs of different application scenarios, so as to adapt to different drainage needs.

[0075] like Figure 3 and Figure 5As shown, according to some embodiments of the present invention, a water-guiding slope 33 is formed at one end of the plug 32 facing the drainage cavity 34. The water-guiding slope 33 is gradually inclined from its top to its bottom in a direction away from the air pressure pipe 1. The drainage hole 35 is located at the bottom of the water-guiding slope 33 and penetrates the plug 32.

[0076] For example, in actual use, if the air pressure pipe 1 is placed horizontally, that is, the axis of the air pressure pipe 1 is parallel to the horizontal direction, then the connecting seat 3 is also placed horizontally. At this time, the inclination direction of the water guide slope 33 is: from top to bottom, it is gradually inclined away from the air pressure pipe 1, and at this time, the drain hole 35 is located at the bottom of the water guide slope 33.

[0077] As described above, the design of the water guiding slope 33 allows condensate to flow smoothly from the drain chamber 34 to the drain hole 35, reducing the possibility of condensate remaining in the drain chamber 34 and improving drainage efficiency. At the same time, since the water guiding slope 33 gradually moves away from the air pressure pipe 1 from top to bottom, it can effectively prevent condensate from flowing back into the air pressure pipe 1 even under certain extreme conditions (such as changes in air pressure), keeping the system dry and clean.

[0078] On the other hand, since the drain hole 35 is located at the lowest point of the water guiding slope 33, the condensate flowing into the drain chamber 34 will not accumulate to a high level in the drain chamber 34, but will be discharged directly through the drain hole 35. Thus, the drain hole 35 can ensure that the condensate is discharged quickly and avoid water accumulation.

[0079] Furthermore, the design of the water guiding slope 33 can be adjusted according to specific application scenarios, such as changing the angle of the slope or the number and size of the drainage holes 35, to adapt to different working conditions and requirements.

[0080] like Figure 3 and Figure 5 As shown, according to some embodiments of the present invention, the side wall of the seat 31 is provided with a plug hole, one end of the pressure tapping connector 4 passes through the plug hole and extends into the drainage chamber 34, and the other end of the pressure tapping connector 4 is used to connect to the pressure tapping port of the fan 7.

[0081] In the radial direction (up and down direction in the figure) of the seat 31, the end of the pressure tap 4 located in the drain cavity 34 is set higher than the drain hole 35.

[0082] It is understood that one end of the pressure tap 4 extends into the drain chamber 34, and the other end connects to the pressure tap of the fan 7, forming a complete airflow pressure tapping path. It is important to note that this invention, by placing the pressure tap 4 at a relatively high position within the drain chamber 34, ensures that the pressure tap 4 is always above the condensate level. Even if a small amount of water accumulates or condensate forms in the drain chamber 34, it will not come into contact with the pressure tap 4, thus avoiding the influence of air pressure detection. Specifically, because the pressure tap 4 is higher than the drain hole 35, condensate will first accumulate at the bottom of the drain chamber 34 and drain through the drain hole 35, rather than flowing into the fan 7 through the pressure tap 4.

[0083] This ensures that condensate will not flow into the pressure tap 4 and the fan 7, preventing moisture from entering the airflow path. At the same time, preventing condensate from entering the pressure tap 4 reduces potential blockage problems caused by moisture, ensuring smooth and unobstructed airflow.

[0084] like Figure 3 and Figure 5 As shown, furthermore, in the radial direction (up and down direction in the figure) of the seat 31, the interface between the seat 31 and the inner air pressure pipe 11 is set higher than the drain hole 35. This helps to ensure that condensate or other liquids accumulated inside the seat 31 can flow smoothly to the drain hole 35 and be discharged, avoiding condensate from remaining inside the seat 31, and also preventing condensate from flowing back into the inner air pressure pipe 11.

[0085] like Figure 3 and Figure 5 As shown, according to some embodiments of the present invention, the end wall of the seat 31 is embedded between the inner air pressure pipe 11 and the outer air pressure pipe 12 and seals one end of the heat insulation cavity 13.

[0086] The air pressure pipe also includes a switch connector 5, with the two ends of the switch connector 5 connected to the air pressure pipe 1 and the air pressure switch 6 respectively. An annular sealing plate 51 is provided on the outer peripheral wall of one end of the switch connector 5 adjacent to the air pressure pipe 1. The annular sealing plate 51 cooperates with the air pressure outer pipe 12 and seals the other end of the heat insulation cavity.

[0087] It is understood that in this embodiment, the end wall of the seat 31 is embedded between the inner air pressure pipe 11 and the outer air pressure pipe 12 to ensure that one end of the heat insulation cavity 13 is completely sealed to prevent heat loss and moisture intrusion; one end of the switch connector 5 is tightly fitted with the outer air pressure pipe 12 through the annular sealing plate 51 to seal the other end of the heat insulation cavity 13 and ensure the integrity of the entire heat insulation cavity 13.

[0088] In this way, both ends of the heat insulation cavity 13 are effectively sealed through the annular sealing plate 51 on the end wall of the seat 31 and the switch connector 5, preventing heat loss from the heat insulation cavity 13, improving the overall heat insulation efficiency, and the effective heat insulation measures reduce the generation of condensate due to temperature difference, ensuring the stable operation of the system.

[0089] like Figure 1 As shown, the gas-fired water heater according to the second aspect of the present invention includes a fan 7 and a pressure switch 6, and also includes a pressure inlet pipe as described in the first aspect of the present invention, wherein one end of the pressure inlet pipe 11 is connected to the pressure inlet of the fan 7 of the gas-fired water heater, and the other end is connected to the pressure switch 6.

[0090] According to the embodiment of this utility model, the gas-fired water heater operates as follows: When the gas-fired water heater is started, the fan 7 begins to run, generating airflow. The airflow first passes through the inner pressure pipe 11. Due to the design of the heat insulation cavity 13 between the inner pressure pipe 11 and the outer pressure pipe 12, the influence of the external low-temperature environment on the airflow is effectively reduced, thus reducing the generation of condensate.

[0091] Airflow is transmitted to the pressure switch 6 through the pressure duct 1. During this process, the presence of the support component 2 ensures the stability and structural integrity of the inner pressure duct 11, guaranteeing unobstructed airflow. The design of the drain chamber 34 and drain hole 35 ensures that any condensate that may be generated can be discharged promptly, without affecting airflow transmission or causing pipe blockage. After the pressure switch 6 detects normal airflow pressure, it confirms that the fan 7 is in normal working condition and allows the gas-fired water heater to continue operating.

[0092] When the gas-fired water heater is turned off, the fan 7 stops operating, and the airflow ceases. At this time, the drain hole 35 remains unobstructed to ensure that any residual condensate can be drained smoothly, preparing for the next startup.

[0093] In summary, the gas-fired water heater of the second aspect of this utility model, by integrating the air pressure pipe of the first aspect embodiment, can not only effectively suppress the generation of condensate on the inner wall of the air pressure pipe, thereby reducing the generation of condensate and ensuring the normal operation of the air pressure switch of the air pressure pipe, but also significantly improve the stability and reliability of the system, extend the service life of the equipment, and enhance the user experience.

[0094] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An air intake pressure pipe applied to a gas water heating device, characterized in that, The application relates to a wind pressure pipeline (1) comprising a wind pressure inner tube (11) and a wind pressure outer tube (12), the wind pressure outer tube (12) is sleeved outside the wind pressure inner tube (11), airtight heat insulation cavities (13) are arranged between the inner wall of the wind pressure outer tube (12) and the outer wall of the wind pressure inner tube (11), one end of the wind pressure inner tube (11) is used for communicating with a pressure tapping port of a fan (7) of a gas water heater, and the other end is used for communicating with a wind pressure switch (6). Supporting pieces (2) are arranged between the wind pressure outer tube (12) and the wind pressure inner tube (11) in the heat insulation cavities (13), one end of the supporting pieces (2) abuts against the inner wall of the wind pressure outer tube (12), and the other end thereof abuts against the outer wall of the wind pressure inner tube (11).

2. The wind pressure taking pipe according to claim 1, wherein The supporting pieces (2) are integrally formed with the wind pressure outer tube (12), or the supporting pieces (2) are integrally formed with the wind pressure inner tube (11).

3. The wind pressure taking pipe according to claim 2, wherein The supporting pieces (2) are supporting rings, the supporting rings are arranged around the peripheral wall of the wind pressure inner tube (11), 4. The wind intake plenum of claim 2, wherein, And / or the number of the supporting rings is plural, and the plural supporting rings are arranged along the axial direction of the wind pressure pipeline (1). Further comprising:

5. The air intake plenum of any one of claims 1 to 4, wherein, A connecting seat (3) is arranged at one end of the wind pressure pipeline (1) for connecting with the fan (7), the connecting seat (3) is formed with a drainage cavity (34) and a drainage hole (35), the wind pressure inner tube (11) communicates with the pressure tapping port of the fan (7) through the drainage cavity (34), and the drainage cavity (34) communicates with the outside of the connecting seat (3) through the drainage hole (35). The connecting seat (3) comprises a seat body (31) and a plug (32), the seat body (31) is a hollow pipe body with two open ends, one end of the seat body (31) is arranged on the wind pressure pipeline (1), and the other end thereof is provided with the detachable plug (32); 6. The air intake plenum of claim 5, wherein, The plug (32) is formed with the drainage hole (35). One end of the plug (32) towards the drainage cavity (34) is formed with a water guide inclined surface (33), the water guide inclined surface (33) is arranged in a direction gradually away from the wind pressure pipeline (1) from the top to the bottom thereof; 7. The air intake plenum of claim 6, wherein, The drainage hole (35) is arranged at the bottom of the water guide inclined surface (33) and penetrates through the plug (32). Further comprising a pressure tapping connector (4), a plug-in hole is arranged on the side wall of the seat body (31), one end of the pressure tapping connector (4) penetrates through the plug-in hole and extends into the drainage cavity (34), and the other end of the pressure tapping connector (4) is used for connecting to the pressure tapping port of the fan (7); 8. The air intake plenum of claim 6, wherein, In the up-down direction, the end of the pressure tapping connector (4) located in the drainage cavity (34) is arranged higher than the drainage hole (35), and the interface between the seat body (31) and the wind pressure inner tube (11) is arranged higher than the drainage hole (35). The end wall of the seat body (31) is embedded between the wind pressure inner tube (11) and the wind pressure outer tube (12) and seals one end of the heat insulation cavities (13).

9. The air intake plenum of claim 6, wherein, ​ And / or, further comprising a switch joint (5), two ends of the switch joint (5) are connected with the wind pressure pipeline (1) and the wind pressure switch (6) respectively, and an annular sealing plate (51) is arranged on the outer peripheral wall of the switch joint (5), the annular sealing plate (51) cooperates with the wind pressure outer pipe (12) and seals the other end of the heat insulation cavity (13).

10. A gas water heating apparatus, characterised in that, Comprise: A fan (7) and a wind pressure switch (6); The wind pressure pipeline according to any one of claims 1 to 9, wherein one end of the wind pressure inner pipe (11) is in communication with a pressure tapping of the fan (7), and the other end is in communication with the wind pressure switch (6).

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