Balanced smoke exhaust pipe assembly and gas water heater

Abstract

The utility model relates to the technical field of hot water supply equipment, and discloses a balance smoke exhaust pipe assembly and a gas water heater. The balance smoke exhaust pipe assembly comprises a smoke exhaust inner pipe, an air inlet outer pipe and a first down draft preventing mechanism, the air inlet outer pipe comprises a first pipe section, a second pipe section and a third pipe section which are sequentially connected in the air inlet circulation direction, the smoke exhaust inner pipe is sleeved with the first pipe section and the third pipe section, and an air inlet channel is formed between the first pipe section and the smoke exhaust inner pipe and between the third pipe section and the smoke exhaust inner pipe; the air inlet channel is communicated with the second pipe section, and the first down draft preventing mechanism is arranged on the second pipe section or the third pipe section. When the gas water heater stops running, the fan stops sucking, and the first down draft preventing mechanism is automatically closed under the action of self gravity, so that the air inlet outer pipe is in a closed state, outdoor air is effectively prevented from reversely flowing into a room through the air inlet outer pipe, the indoor temperature is kept stable, and particularly, the living comfort can be remarkably improved in winter.

Description

Technical Field

[0001] The utility model relates to the technical field of hot water supply equipment, in particular to a balanced smoke exhaust pipe assembly and a gas water heater. Background Art

[0002] A gas water heater is a device that uses gas as an energy source to heat water. Gas water heaters are widely used in households, commercial and industrial fields for hot water supply.

[0003] In the prior art, in winter, due to the cold weather, the family kitchen is usually kept closed to keep warm. During the cooking process, people will turn on the range hood to remove the fumes to keep the kitchen air fresh. However, if a gas water heater is installed in the kitchen at the same time, and the blower of the gas water heater needs to draw air from the indoor for combustion and discharge the flue gas outdoors, it may affect the normal operation of the gas water heater due to the strong suction of the range hood, and even cause a fault prompt of poor smoke exhaust for the water heater. Therefore, a balanced gas water heater can be selected for such scenarios. The balanced gas water heater adopts a coaxial smoke pipe design, and simultaneously inhales outdoor air and discharges flue gas through the coaxial smoke pipe. Since the inhaled air comes from outdoors, it can be completely unaffected by the range hood. However, since the air inhaled by the balanced gas water heater comes from outdoors, when the balanced gas water heater is not in use, especially in winter, the cold outdoor air can enter the room through the coaxial smoke pipe, thus affecting the indoor temperature. Summary of the Utility Model

[0004] The first technical problem solved by the utility model is to provide a balanced smoke exhaust pipe assembly, which effectively solves the problem that cold air enters the room through the coaxial smoke pipe and affects the indoor temperature, and can effectively prevent the outdoor cold air from flowing back into the room from the air inlet end, maintaining the stability of the indoor temperature.

[0005] The second technical problem solved by the utility model is to provide a gas water heater, which can effectively prevent the outdoor cold air from flowing back into the room from the air inlet end, maintaining the stability of the indoor temperature.

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

[0007] A balanced smoke exhaust pipe assembly, comprising:

[0008] A smoke exhaust inner pipe;

[0009] An air intake outer pipe, including a first pipe section, a second pipe section and a third pipe section connected in sequence along the air intake flow direction. The first pipe section and the third pipe section are sleeved on the smoke exhaust inner pipe, and an air intake channel is formed between the first pipe section and the third pipe section and the smoke exhaust inner pipe. The air intake channel is communicated with the second pipe section;

[0010] The first anti-backdraft mechanism is provided on the second pipe section or the third pipe section.

[0011] Compared with the background art, the balanced smoke exhaust pipe assembly of the present utility model has the following beneficial effects: Taking a gas water heater as an example, the flue gas inlet of the smoke exhaust inner pipe is communicated with the smoke exhaust connection port of the gas water heater, the flue gas outlet of the smoke exhaust inner pipe is communicated with the outside, the air inlet of the air intake outer pipe is communicated with the outside, and the air outlet of the air intake outer pipe is communicated with the inside of the gas water heater.

[0012] When the gas water heater is operating, due to the suction force generated by the start of the fan, the first anti-backdraft mechanism is automatically opened under the action of the air flow, so that the first pipe section, the second pipe section and the third pipe section are in a communicating state. Outdoor air enters the inside of the gas water heater along the air intake passage, ensuring sufficient intake air for the gas water heater and not being affected by the negative pressure of the range hood, and ensuring the normal operation of the gas water heater. The flue gas generated during the operation of the gas water heater enters the flue gas inlet of the smoke exhaust inner pipe from the smoke exhaust connection port, and the flue gas is smoothly discharged to the outside through the flue gas outlet, reducing indoor environmental pollution.

[0013] When the gas water heater stops operating, the fan stops sucking, and the first anti-backdraft mechanism automatically closes under its own gravity, so that the air intake outer pipe is in a closed state, effectively preventing outdoor air from flowing back into the room through the air intake outer pipe and maintaining the indoor temperature stability. Especially in winter, the living comfort can be significantly improved.

[0014] In one embodiment, the second pipe section includes a first elbow joint, a second elbow joint and a receiving cavity. The receiving cavity is respectively connected to the first elbow joint and the second elbow joint. The first elbow joint is connected to the first pipe section, the second elbow joint is connected to the third pipe section, and the first anti-backdraft mechanism is provided in the receiving cavity.

[0015] In one embodiment, the first anti-backdraft mechanism includes a rotating shaft and two anti-backdraft covers. The rotating shaft is provided in the receiving cavity and fixedly connected to its inner wall. The two anti-backdraft covers are respectively rotatably provided on both sides of the rotating shaft. The two anti-backdraft covers are horizontally arranged in the closed state and can block the first elbow joint.

[0016] In one embodiment, the receiving cavity includes an upper housing and a lower housing. The upper housing is provided on the lower housing to form a receiving cavity. The upper housing is integrally formed with the second elbow joint, and the lower housing is integrally formed with the first elbow joint.

[0017] In one embodiment, the first anti-backdraft mechanism further includes a shaft seat, a rotating shaft, and an anti-backdraft cover. The shaft seat is disposed inside the accommodating cavity. The anti-backdraft cover is rotatably connected to the shaft seat through the rotating shaft. The anti-backdraft cover is inclined in the closed state and can block the first elbow joint. A limiting block is provided on the inner wall of the air inlet outer tube. When the anti-backdraft cover is opened to the maximum angle state, the limiting block abuts against the anti-backdraft cover.

[0018] In one embodiment, the first elbow joint and the second elbow joint are respectively disposed on opposite sides of the accommodating cavity. One end of the first elbow joint is inserted into the inside of the accommodating cavity, and an anti-backdraft port is formed at the end of the first elbow joint. The anti-backdraft cover is disposed at the anti-backdraft port in the closed state.

[0019] In one embodiment, a sealing ring is further included. The sealing ring is installed on the inner wall of the air inlet outer tube. The anti-backdraft cover rotates to overlap with the sealing ring to close the air inlet outer tube.

[0020] In one embodiment, the first anti-backdraft mechanism further includes a weight member, and the weight member is disposed on the anti-backdraft cover.

[0021] In one embodiment, a second anti-backdraft mechanism is provided inside the smoke exhaust inner tube.

[0022] The above second technical problem is solved by the following technical solutions:

[0023] A gas water heater, comprising:

[0024] A housing;

[0025] A balanced smoke exhaust pipe assembly, wherein the smoke exhaust inner tube is communicated with a smoke exhaust connection port inside the housing, and the air inlet outer tube is communicated with the inner cavity of the housing;

[0026] The third pipe section is disposed inside the housing, and an air outlet is provided on one side of the third pipe section. The first anti-backdraft mechanism is disposed on the third pipe section, and can block the air outlet when the first anti-backdraft mechanism is in the closed state.

[0027] Compared with the background art, the gas water heater of the present invention has the beneficial effects that: by installing the balanced smoke exhaust pipe assembly on the gas water heater, when the gas water heater is in the operating state, the first anti-backdraft mechanism automatically opens to ensure sufficient air intake of the gas water heater, and the smoke is smoothly discharged to the outside through the smoke exhaust inner tube. When the gas water heater stops operating, the first anti-backdraft mechanism automatically closes to effectively prevent outdoor cold air from flowing back into the room. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1 Internal schematic diagram of a balanced smoke exhaust pipe assembly according to an embodiment of the present invention;

[0030] Figure 2 Internal schematic diagram of a balanced smoke exhaust pipe assembly according to another embodiment of the present invention;

[0031] Figure 3 Principle schematic diagram of a balanced smoke exhaust pipe assembly installed on a gas water heater according to an embodiment of the present invention;

[0032] Figure 4 For Figure 3 Internal principle schematic diagram of the balanced smoke exhaust pipe assembly in the open state in

[0033] Figure 5 Principle schematic diagram of a balanced smoke exhaust pipe assembly installed on a gas water heater according to another embodiment of the present invention;

[0034] Figure 6 For Figure 5 Internal principle schematic diagram of the balanced smoke exhaust pipe assembly in the open state in

[0035] Figure 7 Internal schematic diagram of a balanced smoke exhaust pipe assembly according to another embodiment of the present invention;

[0036] Figure 8 Internal schematic diagram of a balanced smoke exhaust pipe assembly installed on a gas water heater according to another embodiment of the present invention;

[0037] Figure 9 Internal schematic diagram of a balanced smoke exhaust pipe assembly installed on a gas water heater according to another embodiment of the present invention.

[0038] Explanation of reference numerals:

[0039] 1. Smoke exhaust inner pipe; 2. Air intake outer pipe; 201. First pipe section; 202. Second pipe section; 2021. First elbow joint; 20211. Anti-backdraft port; 2022. Second elbow joint; 2023. Accommodation cavity; 20231. Upper housing; 20232. Lower housing; 203. Third pipe section; 3. Air intake channel; 4. First anti-backdraft mechanism; 401. Rotating shaft; 402. Anti-backdraft cover; 403. Shaft seat; 5. Limit block; 6. Sealing ring; 7. Counterweight; 8. Second anti-backdraft mechanism; 9. Housing; 10. Coaxial smoke pipe; 11. Wall. Detailed implementation manner

[0040] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0041] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application 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 therefore cannot be understood as a limitation to the present application.

[0042] The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "plurality" is two or more.

[0043] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0044] In the related art, a balanced gas water heater adopts a coaxial flue design, and simultaneously inhales outdoor air and discharges flue gas through the coaxial flue. Since the inhaled air comes from the outside, it can be completely unaffected by the range hood. However, because the air inhaled by the balanced gas water heater comes from the outside, when the balanced gas water heater is not in use, especially in winter, the cold outdoor air can enter the room through the coaxial flue, thus affecting the indoor temperature.

[0045] In order to solve the above technical problems, embodiments of the present invention will be described below in conjunction with Figures 1 to 9 .

[0046] According to an embodiment of the present invention, on the one hand, as Figure 1 shown, a balanced smoke exhaust pipe assembly is provided, which includes a smoke exhaust inner pipe 1, an air intake outer pipe 2, and a first anti-backdraft mechanism 4.

[0047] Specifically, as Figure 1 and Figure 2 shown, the air intake outer pipe 2 includes a first pipe section 201, a second pipe section 202, and a third pipe section 203 that are connected in communication, wherein the first pipe section 201, the second pipe section 202, and the third pipe section 203 are connected in sequence along the air intake flow direction.

[0048] Specifically, as Figure 1 and Figure 2 shown, the first pipe section 201 and the third pipe section 203 are sleeved on the smoke exhaust inner pipe 1, and an air intake channel 3 is formed between the first pipe section 201 and the smoke exhaust inner pipe 1. Similarly, an air intake channel 3 is formed between the third pipe and the smoke exhaust inner pipe 1. The air intake channel 3 is connected to the second pipe section 202 in communication.

[0049] Specifically, as Figure 1 and Figure 2 shown, the first anti-backdraft mechanism 4 is arranged in the second pipe section 202, or as Figure 8 and Figure 9 shown, the first anti-backdraft mechanism 4 is arranged on the third pipe section 203.

[0050] For this balanced smoke exhaust pipe assembly, taking a gas water heater as an example, the flue gas inlet of the smoke exhaust inner pipe 1 is connected to the flue gas connection port of the gas water heater, the flue gas outlet of the smoke exhaust inner pipe 1 is connected to the outside, the air intake port of the air intake outer pipe 2 is connected to the outside, and the air outlet of the air intake outer pipe 2 is connected to the inside of the gas water heater.

[0051] When the gas water heater is operating, due to the suction force generated by the start-up of the fan, the first anti-backdraft mechanism 4 is automatically opened under the action of the air flow, so that the first pipe section 201, the second pipe section 202 and the third pipe section 203 are in a connected state. Outdoor air enters the interior of the gas water heater along the intake passage 3, ensuring sufficient intake air for the gas water heater and being unaffected by the negative pressure of the range hood, thus ensuring the normal operation of the gas water heater. The flue gas generated during the operation of the gas water heater enters the flue gas inlet of the exhaust inner pipe 1 from the exhaust connection port, and the flue gas is smoothly discharged to the outside through the flue gas outlet, reducing indoor environmental pollution.

[0052] When the gas water heater stops operating, the fan stops sucking, and the first anti-backdraft mechanism 4 automatically closes under its own gravity, causing the intake outer pipe 2 to be in a closed state, effectively preventing outdoor air from flowing back into the room through the intake outer pipe 2 and maintaining the indoor temperature stability. Especially in winter, the living comfort can be significantly improved.

[0053] Specifically, both the exhaust inner pipe 1 and the intake outer pipe 2 can be set as vertical pipes, horizontal pipes or bent pipes of other shapes. In the embodiments of the present application, the shapes of the exhaust inner pipe 1 and the intake outer pipe 2 are not specifically limited.

[0054] Specifically, the first pipe section 201 and the third pipe section 203 are sleeved outside the exhaust inner pipe 1. The first pipe section 201 and the third pipe section 203 can be coaxially sleeved with the exhaust inner pipe 1, or the first pipe section 201 and the third pipe section 203 can be non-coaxially sleeved with the exhaust inner pipe 1. In the embodiments of the present application, the positional relationship between the first pipe section 201 and the third pipe section 203 and the exhaust inner pipe 1 is not specifically limited.

[0055] Specifically, the first anti-backdraft mechanism 4 can be automatically opened and closed in an electric control manner, or can be automatically opened and closed based on the force exerted on the first anti-backdraft mechanism 4 by the external air flow and the self-gravity of the first anti-backdraft mechanism 4. In the embodiments of the present application, the opening and closing manner of the first anti-backdraft mechanism 4 is not specifically limited.

[0056] Specifically, as Figure 3 and Figure 5 shown, the balanced exhaust pipe assembly can be arranged outside the gas water heater. As Figure 8 and Figure 9 shown, the balanced exhaust pipe assembly can also be arranged inside the gas water heater.

[0057] In one embodiment, as Figure 1 and Figure 2As shown, the second pipe segment 202 includes a first elbow joint 2021, a second elbow joint 2022, and a receiving cavity 2023. Among them, the receiving cavity 2023 is respectively connected to the first elbow joint 2021 and the second elbow joint 2022. The first elbow joint 2021 is connected to the first pipe segment 201, the second elbow joint 2022 is connected to the third pipe segment 203, and the first anti-backdraft mechanism 4 is disposed in the receiving cavity 2023.

[0058] By providing the first elbow joint 2021 and the second elbow joint 2022 on the second pipe segment 202, connecting the first elbow joint 2021 to the first pipe segment 201 and the second elbow joint 2022 to the third pipe segment 203, it is convenient for the second pipe segment 202 to communicate with the intake channels 3 of the first pipe segment 201 and the third pipe segment 203, and at the same time helps to improve the structural stability of the entire intake outer pipe 2.

[0059] By providing the receiving cavity 2023 on the second pipe segment 202, the receiving cavity 2023 provides an independent space for the first anti-backdraft mechanism 4, facilitating the installation of the first anti-backdraft mechanism 4.

[0060] Specifically, the first elbow joint 2021 and the second elbow joint 2022 can be respectively disposed on opposite sides of the receiving cavity 2023. The first elbow joint 2021 and the second elbow joint 2022 can be bent into an arc shape or a right angle shape, etc. In the embodiments of the present application, the shapes of the first elbow joint 2021 and the second elbow joint 2022 are not specifically limited.

[0061] Specifically, the diameter of the receiving cavity 2023 can be larger than the diameter of the first elbow joint 2021 or the second elbow joint 2022, ensuring that there is sufficient installation space in the receiving cavity 2023 to facilitate the installation of the first anti-backdraft mechanism 4.

[0062] Specifically, the first elbow joint 2021, the receiving cavity 2023, and the second elbow joint 2022 can be connected by a mutually buckling method or by a welding method. In the embodiments of the present application, the connection methods of the first elbow joint 2021, the receiving cavity 2023, and the second elbow joint 2022 are not specifically limited.

[0063] In one embodiment, as Figure 1 and Figure 4 shown, the first anti-backdraft mechanism 4 includes a rotating shaft 401 and anti-backdraft covers 402, and there are two anti-backdraft covers 402. The rotating shaft 401 is installed in the receiving cavity 2023 and fixedly connected to the inner wall of the receiving cavity 2023. The two anti-backdraft covers 402 are respectively rotatably disposed on both sides of the rotating shaft 401. The two anti-backdraft covers 402 are horizontally arranged in the closed state and can block the first elbow joint 2021.

[0064] The two backdraft prevention covers 402 are respectively arranged on both sides of the rotating shaft 401. On the one hand, it can provide two-way sealing and backdraft prevention protection, forming a tighter sealing effect, and can more effectively prevent the intrusion of cold air or other pollutants. On the other hand, when the two backdraft prevention covers 402 are in the open state, a larger channel can be formed, ensuring sufficient air supply during the operation of the gas water heater, and improving the combustion efficiency and equipment performance.

[0065] When the first backdraft prevention mechanism 4 is in the closed state, the two backdraft prevention covers 402 are horizontally arranged under the action of gravity, ensuring that the backdraft prevention covers 402 can provide a tighter sealing effect.

[0066] Specifically, when the two backdraft prevention covers 402 are horizontally arranged, the plane formed by the two backdraft prevention covers 402 is adapted to the cross-section inside the accommodation cavity 2023, and then the first elbow joint 2021 is blocked by the two horizontally arranged backdraft prevention covers 402. For example, when the accommodation cavity is a circular pipe, the backdraft prevention cover 402 can be set as a semi-circle, and the diameter of the backdraft prevention cover 402 is the same as the inner diameter of the accommodation cavity.

[0067] Specifically, the backdraft prevention cover 402 and the rotating shaft 401 can be rotatably connected through a sleeve, or can be rotatably connected by means of a hinge. In the embodiment of the present application, the connection method between the backdraft prevention cover 402 and the rotating shaft 401 is not specifically limited.

[0068] In one embodiment, as Figure 1 and Figure 4 shown, the accommodation cavity 2023 includes an upper housing 20231 and a lower housing 20232. The upper housing 20231 is arranged on the lower housing 20232 to form an accommodation cavity. The upper housing 20231 is integrally formed with the second elbow joint 2022, and the lower housing 20232 is integrally formed with the first elbow joint 2021.

[0069] The integral formation of the upper housing 20231 and the second elbow joint 2022, and the integral formation of the lower housing 20232 and the first elbow joint 2021 contribute to improving the structural stability of the second pipe section 202, reducing loosening or deformation caused by vibration or external force during use. At the same time, the integral formation setting improves the sealing performance between components, ensuring that air does not leak before entering the gas water heater.

[0070] The accommodation cavity 2023 is divided into an upper housing 20231 and a lower housing 20232. When installing the first backdraft prevention mechanism 4, the first backdraft prevention mechanism 4 can be first installed in the upper housing 20231 or the lower housing 20232, and then the upper housing 20231 and the lower housing 20232 are assembled and installed, which is convenient for the installation of the first backdraft prevention mechanism 4.

[0071] Specifically, the upper housing 20231 and the lower housing 20232 can be connected by snap - fitting or fixedly connected by welding. In the embodiments of the present application, the connection method between the upper housing 20231 and the lower housing 20232 is not specifically limited.

[0072] In one embodiment, as Figure 2 and Figure 6 shown, the first anti - backdraft mechanism 4 further includes a shaft seat 403, a rotating shaft 401 and an anti - backdraft cover 402. There is one anti - backdraft cover 402. The shaft seat 403 is installed in the inner cavity of the accommodating cavity 2023, and the anti - backdraft cover 402 is rotatably connected to the shaft seat 403 through the rotating shaft 401. In the closed state of the anti - backdraft cover 402, the anti - backdraft cover 402 is inclined and can block the first elbow joint 2021. A limiting block 5 is provided on the inner wall of the intake outer tube 2. When the anti - backdraft cover 402 is opened to the maximum angle state, the limiting block 5 abuts against the anti - backdraft cover 402.

[0073] The single anti - backdraft cover 402 is rotatably arranged on the shaft seat 403 through the rotating shaft 401, which simplifies the overall design of the first anti - backdraft mechanism 4, reduces the number of parts, makes the whole system more compact, and is easy to install and maintain. Compared with the design using multiple anti - backdraft covers 402, the single anti - backdraft cover 402 can reduce the material cost and production cost, reduce the failure points, improve the reliability and durability of the first anti - backdraft mechanism 4, and at the same time reduce the cost of subsequent maintenance and replacement of parts.

[0074] When the first anti - backdraft mechanism 4 is in the closed state, the anti - backdraft cover 402 is inclined, so that the anti - backdraft cover 402 can block the first elbow joint 2021 under the action of gravity, providing a tighter sealing effect. Since the limiting block 5 is provided on the inner wall of the intake outer tube 2, when the anti - backdraft cover 402 is opened to a certain angle, the limiting block 5 abuts against the anti - backdraft cover 402, so that the limiting block 5 can limit the maximum opening angle of the anti - backdraft cover 402.

[0075] Specifically, as Figure 2 shown, the rotating shaft 401 and the shaft seat 403 can be arranged on the upper side close to the inner wall of the accommodating cavity 2023, so that the anti - backdraft cover 402 can rotate downward under its own gravity to block the first elbow joint 2021.

[0076] Specifically, the inclination angle of the end of the first elbow joint 2021 is adapted to the inclination angle of the anti - backdraft cover 402 in the closed state to ensure that the anti - backdraft cover 402 can block the first elbow joint 2021 in the closed state.

[0077] In one embodiment, as Figure 2 and Figure 6As shown, the first elbow joint 2021 and the second elbow joint 2022 are respectively arranged on opposite sides of the accommodating cavity 2023. One end of the first elbow joint 2021 is inserted into the interior of the accommodating cavity 2023, and an anti-backflow port 20211 is formed at the end of the first elbow joint 2021. The anti-backflow cover 402 is covered at the anti-backflow port 20211 in the closed state.

[0078] The first elbow joint 2021 and the second elbow joint 2022 are respectively arranged on opposite sides of the accommodating cavity 2023, which helps to optimize the air flow path and ensure that air smoothly enters the gas water heater from the outside.

[0079] Inserting the end of the first elbow joint 2021 into the accommodating cavity 2023 to form the anti-backflow port 20211, and the anti-backflow cover 402 closely fits with the anti-backflow port 20211 in the closed state, which helps to improve the sealing performance of the whole system, can effectively prevent air from flowing back into the room, and improve the anti-backflow performance.

[0080] In one embodiment, as Figure 1 shown, it further includes a sealing ring 6. The sealing ring 6 is installed on the inner wall of the intake outer pipe 2. When the anti-backflow cover 402 rotates to abut against the sealing ring 6, the anti-backflow cover 402 closes the intake outer pipe 2.

[0081] In the state where the gas water heater stops operating, the anti-backflow cover 402 rotates under the action of gravity to overlap with the sealing ring 6, so that the anti-backflow cover 402 is in the closed state. The sealing ring 6 can significantly improve the sealing performance when the anti-backflow cover 402 is closed, ensure that when the gas water heater stops operating, outdoor air cannot flow back into the room through the intake outer pipe 2, effectively prevent the backflow of cold air, and keep the indoor temperature stable.

[0082] Specifically, the shape of the sealing ring 6 can be adapted to the inner wall shape of the intake outer pipe 2. The sealing ring 6 can be selected from existing sealing rings 6 such as rubber sealing rings 6 and silicone rubber sealing rings 6. In the embodiment of the present application, the shape and type of the sealing ring 6 are not specifically limited.

[0083] In one embodiment, as Figure 2 shown, the first anti-backflow mechanism 4 further includes a counterweight 7, and the counterweight 7 is arranged on the anti-backflow cover 402.

[0084] Setting the counterweight 7 on the anti-backflow cover 402 can increase the self-weight of the anti-backflow cover 402. In the state where the gas water heater stops operating, it ensures that the anti-backflow cover 402 naturally hangs down to close the intake outer pipe 2 and prevent backflow. At the same time, when the anti-backflow cover 402 is closed, the weight of the counterweight 7 can increase the pressure between the anti-backflow cover 402 and the inner wall of the intake outer pipe 2, thereby improving the sealing effect and preventing air leakage.

[0085] Specifically, the counterweight 7 can be selected as a counterweight block, a counterweight plate, a counterweight rod, etc. according to requirements. In the embodiment of the present application, the type of the counterweight 7 is not specifically limited.

[0086] Specifically, the counterweight 7 can be arranged on the anti-backdraft cover 402 by welding, or can also be fixedly connected to the anti-backdraft cover 402 through fasteners. In the embodiment of the present application, the connection method between the counterweight 7 and the anti-backdraft cover 402 is not specifically limited.

[0087] In one embodiment, as Figure 1 、 Figure 2 、 Figure 4 、 Figure 6 and Figure 7 shown, a second anti-backdraft mechanism 8 is provided in the smoke exhaust inner pipe 1.

[0088] By providing the second anti-backdraft mechanism 8 in the smoke exhaust inner pipe 1, when the gas water heater is in an operating state, the blower of the gas water heater starts, and the anti-backdraft cover 402 of the second anti-backdraft mechanism 8 is blown open by the wind to open the smoke exhaust passage. When the gas water heater is in a stopped operating state, the anti-backdraft cover 402 of the second anti-backdraft mechanism 8 closes the smoke exhaust inner pipe 1 to prevent outdoor air from flowing back into the room through the smoke exhaust inner pipe 1.

[0089] Specifically, the second anti-backdraft mechanism 8 in the smoke exhaust inner pipe 1 can be provided with one anti-backdraft cover 402 or two anti-backdraft covers 402. In the embodiment of the present application, the second anti-backdraft mechanism 8 in the smoke exhaust inner pipe 1 is not specifically limited.

[0090] Specifically, as Figure 3 shown, it further includes a coaxial smoke pipe 10. One end of the coaxial smoke pipe 10 is respectively in one-to-one correspondence and communication with the smoke exhaust inner pipe 1 and the intake outer pipe 2, and the other end passes through the wall 11 and extends to the outside of the room.

[0091] By correspondingly connecting one end of the coaxial smoke pipe 10 with the smoke exhaust inner pipe 1 and the intake outer pipe 2, and the other end passing through the wall 11 and extending to the outside of the room, when the gas water heater is in an operating state, outdoor air enters the intake outer pipe 2 of the coaxial smoke pipe 10, ensuring sufficient intake of the gas water heater, and smoothly discharging the smoke to the outside of the room through the smoke exhaust inner pipe 1 and the coaxial smoke pipe 10.

[0092] According to an embodiment of the present invention, on the other hand, in combination with Figures 1 to 9 shown, a gas water heater is further provided, including a housing 9 and a balanced smoke exhaust pipe assembly.

[0093] Specifically, as Figure 3 and Figure 5 shown, the smoke exhaust inner pipe 1 is in communication with the smoke exhaust connection port in the housing 9, and the intake outer pipe 2 is in communication with the inner cavity of the housing 9.

[0094] Specifically, as Figure 8 and Figure 9 shown, the third pipe section 203 is disposed in the inner cavity of the housing 9, and an air outlet is provided on one side of the third pipe section 203. The first anti-backdraft mechanism 4 is disposed on the third pipe section 203, and can block the air outlet when the first anti-backdraft mechanism 4 is in a closed state.

[0095] In this gas water heater, by installing the balanced smoke exhaust pipe assembly on the gas water heater, when the gas water heater is in an operating state, the first anti-backdraft mechanism 4 automatically opens to ensure sufficient intake air for the gas water heater. And the flue gas is smoothly discharged to the outside through the smoke exhaust inner pipe 1. When the gas water heater stops operating, the first anti-backdraft mechanism 4 automatically closes to effectively prevent the outside cold air from flowing back into the room.

[0096] Specifically, as Figure 8 and Figure 9 shown, a part of the third pipe section 203 can be installed in the inner cavity of the housing 9, and the first anti-backdraft mechanism 4 can be installed at the air outlet of the third pipe section 203 located inside the housing 9. When the first anti-backdraft mechanism 4 is opened, the third pipe section 203 is communicated with the inner cavity of the housing 9. When the first anti-backdraft mechanism 4 is closed, the third pipe section 203 is separated from the inner cavity of the housing 9 to prevent the outside air from flowing back.

[0097] The working principle of the gas water heater in this embodiment is described as follows:

[0098] Connect the flue gas inlet of the smoke exhaust inner pipe 1 to the smoke exhaust connection port in the housing 9, connect the flue gas outlet of the smoke exhaust inner pipe 1 to one end of the coaxial smoke pipe 10, connect the air inlet of the air intake outer pipe 2 to one end of the coaxial smoke pipe 10, connect the air outlet of the air intake outer pipe 2 to the inner cavity of the housing 9, and the other end of the coaxial smoke pipe 10 passes through the wall 11 and extends to the outside.

[0099] When the gas water heater is in an operating state, the forces exerted on the anti-backdraft cover 402 in the air intake outer pipe 2 by the fan of the gas water heater and the outside wind cause the anti-backdraft cover 402 to rotate and open. The outside air sequentially passes through the first pipe section 201, the second pipe section 202, and the third pipe section 203 and enters the inner cavity of the housing 9 to ensure sufficient intake air for the gas water heater. The force exerted on the second anti-backdraft mechanism 8 in the smoke exhaust inner pipe 1 by the fan of the gas water heater causes the anti-backdraft cover 402 to rotate and open. The flue gas generated when the gas water heater operates is discharged from the smoke exhaust inner pipe 1 into the coaxial smoke pipe 10 and is smoothly discharged to the outside.

[0100] When the gas water heater stops operating, the anti-backdraft covers 402 in the air intake outer pipe 2 and the smoke exhaust inner pipe 1 are automatically rotated and closed under the influence of gravity, effectively preventing the outside cold air from flowing back into the room through the smoke exhaust inner pipe 1 and the air intake outer pipe 2 and maintaining the indoor temperature stability.

[0101] In the specific content of the above specific embodiments, each technical feature can be combined arbitrarily without contradiction. For the sake of concise description, not all possible combinations of the above technical features are described. However, as long as the combinations of these technical features do not exist in contradiction, they should all be considered as within the scope described in this specification.

[0102] The specific content of the above specific embodiments only expresses several embodiments of the present utility model, and its description is relatively specific and detailed. However, it should not be construed as a limitation on the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model shall be subject to the appended claims.

Claims

1. A balanced exhaust pipe assembly, characterized in that, Comprising: An exhaust inner pipe (1); An intake outer pipe (2), including a first pipe section (201), a second pipe section (202), and a third pipe section (203) connected in sequence along the intake flow direction. The first pipe section (201) and the third pipe section (203) are sleeved on the exhaust inner pipe (1), and an intake passage (3) is formed between the first pipe section (201) and the third pipe section (203) and the exhaust inner pipe (1). The intake passage (3) is communicated with the second pipe section (202); A first anti-backdraft mechanism (4) provided on the second pipe section (202) or the third pipe section (203).

2. The balanced exhaust pipe assembly according to claim 1, wherein: The second pipe section (202) includes a first elbow joint (2021), a second elbow joint (2022), and a receiving cavity (2023). The receiving cavity (2023) is respectively connected to the first elbow joint (2021) and the second elbow joint (2022). The first elbow joint (2021) is connected to the first pipe section (201), and the second elbow joint (2022) is connected to the third pipe section (203). The first anti-backdraft mechanism (4) is provided in the receiving cavity (2023).

3. The balanced smoke exhaust pipe assembly according to claim 2, characterized in that: The first anti-backdraft mechanism (4) includes a rotating shaft (401) and two anti-backdraft covers (402). The rotating shaft (401) is provided in the receiving cavity (2023) and fixedly connected to its inner wall. The two anti-backdraft covers (402) are respectively rotatably provided on both sides of the rotating shaft (401). The two anti-backdraft covers (402) are horizontally arranged in the closed state and can block the first elbow joint (2021).

4. The balanced exhaust pipe assembly according to claim 3, wherein: The receiving cavity (2023) includes an upper housing (20231) and a lower housing (20232). The upper housing (20231) is provided on the lower housing (20232) to form a receiving cavity. The upper housing (20231) is integrally formed with the second elbow joint (2022), and the lower housing (20232) is integrally formed with the first elbow joint (2021).

5. The balanced smoke exhaust pipe assembly according to claim 2, wherein: The first anti-backdraft mechanism (4) further includes a shaft seat (403), a rotating shaft (401), and an anti-backdraft cover (402). The shaft seat (403) is provided in the inner cavity of the receiving cavity (2023). The anti-backdraft cover (402) is rotatably connected to the shaft seat (403) through the rotating shaft (401). The anti-backdraft cover (402) is inclined in the closed state and can block the first elbow joint (2021). A limiting block (5) is provided on the inner wall of the intake outer pipe (2). When the anti-backdraft cover (402) is opened to the maximum angle state, the limiting block (5) abuts against the anti-backdraft cover (402).

6. The balanced smoke exhaust pipe assembly according to claim 5, characterized in that: The first elbow joint (2021) and the second elbow joint (2022) are respectively arranged on opposite sides of the accommodation cavity (2023). One end of the first elbow joint (2021) is inserted into the interior of the accommodation cavity (2023), and an anti-backdraft port (20211) is formed at the end of the first elbow joint (2021). The anti-backdraft cover (402) covers the anti-backdraft port (20211) in the closed state.

7. The balanced smoke exhaust pipe assembly according to any one of claims 3 to 6, characterized in that: It further includes a sealing ring (6). The sealing ring (6) is installed on the inner wall of the air intake outer tube (2). The anti-backdraft cover (402) rotates to overlap with the sealing ring (6) to close the air intake outer tube (2).

8. The balanced exhaust pipe assembly according to any one of claims 3 to 6, characterized in that: The first anti-backdraft mechanism (4) further includes a counterweight (7). The counterweight (7) is arranged on the anti-backdraft cover (402).

9. The balanced smoke exhaust pipe assembly according to any one of claims 1 to 6, characterized in that: A second anti-backdraft mechanism (8) is arranged in the smoke exhaust inner tube (1).

10. A gas water heater, characterized in that, It includes: A housing (9); And the balanced smoke exhaust pipe assembly according to any one of claims 1 to 9. The smoke exhaust inner tube (1) is communicated with the smoke exhaust connection port in the housing (9), and the air intake outer tube (2) is communicated with the inner cavity of the housing (9); The third pipe section (203) is arranged in the inner cavity of the housing (9), and an air outlet is arranged on one side of the third pipe section (203). The first anti-backdraft mechanism (4) is arranged on the third pipe section (203), and the air outlet can be blocked when the first anti-backdraft mechanism (4) is in the closed state.

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