Water inlet pipe assembly and water heater

Abstract

The utility model discloses a water inlet pipe assembly and water heater belongs to electric water heater technical field. Among them, water inlet pipe assembly includes inner tube, outer tube and plug, and inner tube is equipped with water inlet channel, and inner tube has first end and second end who set gradually along the water flow direction of water inlet channel, and the end face of second end is equipped with first water passing hole, and the peripheral wall of inner tube is equipped with second water passing hole, and first water passing hole and second water passing hole are connected with water inlet channel respectively, outer tube is sleeved in the outer periphery of inner tube, and is connected with first end, and the inner peripheral wall of outer tube is spaced apart with the outer peripheral wall of inner tube and defines the reflux channel, and the peripheral wall of outer tube is equipped with the water outlet hole who communicates with reflux channel, the plug is connected in the one end of outer tube close to second end, and the plug is configured as can flow -off water from first water passing hole to reflux channel. The utility model has strengthened the disturbance of new injection water flow to the original hot water in water tank, has accelerated the heat exchange between original hot water and newly injected cold water, and has improved the uniformity of water tank water temperature.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, and in particular to a water inlet pipe assembly and a water heater. Background Technology

[0002] In related technologies, electric water heaters generally use a bottom-inlet water tank, where water is injected through an inlet pipe located at the bottom of the tank, gradually filling the tank space from bottom to top. However, during the process of injecting low-temperature cold water from the bottom of the tank, the cold water tends to concentrate in the lower space of the tank, while the original hot water in the tank is located in the upper space, resulting in a significant temperature stratification phenomenon. This causes uneven water temperature within the tank and prolongs the overall water temperature rise time. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a water inlet pipe assembly that can avoid the water flowing out of the outlet in a single direction, thereby improving the uniformity of the water temperature in the water tank by disturbing the existing hot water in the tank.

[0004] This utility model also proposes a water heater that includes the above-mentioned water inlet pipe assembly.

[0005] According to a first aspect of the present invention, a water inlet pipe assembly includes: an inner pipe, an outer pipe, and a plug. The inner pipe has a water inlet channel and has a first end and a second end arranged sequentially along the water flow direction of the water inlet channel. The end face of the second end has a first water passage hole, and the peripheral wall of the inner pipe has a second water passage hole. The first water passage hole and the second water passage hole are respectively connected to the water inlet channel. The outer pipe is sleeved on the outer periphery of the inner pipe and connected to the first end. The inner peripheral wall of the outer pipe is spaced apart from the outer peripheral wall of the inner pipe and defines a return channel. The peripheral wall of the outer pipe has a water outlet hole communicating with the return channel. The plug is connected to the end of the outer pipe near the second end and is configured to guide water flowing from the first water passage hole to the return channel.

[0006] The water inlet pipe assembly according to the embodiments of this utility model has at least the following beneficial effects: The water inlet pipe assembly of this utility model provides a first water passage hole on the end face of the inner pipe and a second water passage hole on the outer peripheral wall of the inner pipe, thereby forming water flow in the water inlet channel with two outlet paths in the axial and radial directions. The outer pipe is sleeved on the outer periphery of the inner pipe, wherein the inner peripheral wall of the outer pipe is spaced apart from the outer peripheral wall of the inner pipe and cooperates to define a return channel. A plug connected to one side of the outer pipe is positioned opposite to the first water passage hole. The plug can bounce the water flowing out of the first water passage hole back to the return channel and merge with the water flowing out of the second water passage hole to generate turbulence. This avoids the water flowing out of the outlet hole of the outer pipe having a single direction, enhances the disturbance of the newly injected water flow to the original hot water in the water tank, thereby accelerating the heat exchange between the original hot water and the newly injected cold water, thus improving the uniformity of the water temperature in the water tank, preventing the occurrence of local low temperature zones, and improving the overall heating efficiency of the hot water in the water tank.

[0007] According to some embodiments of the present invention, the inner tube includes a connecting portion and a water-passing portion arranged sequentially from the first end to the second end. The connecting portion and the water-passing portion are connected to each other and jointly define the water inlet channel. The connecting portion abuts against the inner peripheral wall of the outer tube. The water-passing portion is spaced apart from the inner peripheral wall of the outer tube to form the return channel with the inner peripheral wall of the outer tube. The first water-passing hole and the second water-passing hole are provided in the water-passing portion.

[0008] According to some embodiments of the present invention, the connecting part and the water-passing part are coaxially arranged, the outer diameter of the connecting part is larger than the outer diameter of the water-passing part, and a stepped surface is provided between the outer peripheral wall of the connecting part and the outer peripheral wall of the water-passing part. One end of the stepped surface is connected to the outer peripheral wall of the connecting part, and the other end is connected to the outer peripheral wall of the water-passing part.

[0009] According to some embodiments of the present invention, the outer tube is provided with a first opening and a second opening at both ends, the plug is installed at the first opening, the plug includes a water-blocking part covering the first opening, the water-blocking part is spaced apart from the first water passage hole, and the connecting part passes through the second opening.

[0010] According to some embodiments of this utility model, the distance between the first water passage hole and the water-blocking part is L, which satisfies: 7mm≤L≤11mm.

[0011] According to some embodiments of this utility model, the minimum gap between the inner peripheral wall of the outer tube and the outer peripheral wall of the water passage is W, which satisfies: 1mm≤W≤2mm.

[0012] According to some embodiments of this utility model, the first water passage and the second water passage are circular holes, the minimum diameter of the first water passage is D1, and the minimum diameter of the second water passage is D2, satisfying: 0mm < D1 - D2 ≤ 1mm.

[0013] According to some embodiments of this utility model, multiple water outlet holes are provided, and the multiple water outlet holes are distributed at intervals on the outer peripheral wall of the outer tube to form a water outlet section. At least two second water passage holes are provided, and at least two second water passage holes are arranged at intervals along the circumference of the inner tube. At least two second water passage holes are offset from the water outlet section along the axial direction of the inner tube, and / or offset from the water outlet section along the circumference of the inner tube.

[0014] According to some embodiments of the present invention, the water outlet includes at least two groups of holes arranged sequentially from the first end to the second end, each group of holes including a plurality of water outlet holes, and the one of the at least two groups of holes closer to the first end is the first group of holes. The water inlet pipe assembly also includes a filter screen, which is sleeved on the outer periphery of the outer pipe and covers all the water outlet holes of the first group of holes. A water heater according to a second aspect of the present invention includes a water tank and an inlet pipe assembly according to a first aspect of the present invention, wherein the inlet pipe assembly is arranged in a vertical direction and connected to the water tank.

[0015] The water heater according to the embodiments of this utility model has at least the following beneficial effects: The water heater of this utility model embodiment adopts the inlet pipe assembly of the first aspect embodiment. An outer pipe is sleeved on the outer periphery of an inner pipe. The inner peripheral wall of the outer pipe is spaced apart from the outer peripheral wall of the inner pipe, and a return channel is defined in cooperation. A plug connected to one side of the outer pipe is positioned opposite to the first water passage hole. The plug can rebound the water flowing out of the first water passage hole and guide it to the return channel, where it merges with the water flowing out of the second water passage hole to generate turbulence. This avoids the water flowing out of the outlet hole of the outer pipe having a single direction, enhances the disturbance of the existing hot water in the water tank by the newly injected water flow, thereby accelerating the heat exchange between the existing hot water and the newly injected cold water, improving the uniformity of the water temperature in the water tank, preventing the occurrence of local low temperature zones, making the outlet water temperature of the water tank more stable, improving the overall heating efficiency of the hot water in the water tank, improving the stability of the outlet water temperature, and thus improving the user experience. Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1This is a schematic diagram of the water inlet pipe assembly being assembled in a water tank according to an embodiment of the present invention; Figure 2 This is an exploded view of the water inlet pipe assembly according to an embodiment of the present invention; Figure 3 This is a cross-sectional schematic diagram of a water inlet pipe assembly according to an embodiment of the present invention; Figure 4 for Figure 3 A magnified view of a section at point A in the middle; Figure 5 This is a schematic diagram of the inner tube structure according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the assembly of the water inlet pipe assembly according to an embodiment of the present invention.

[0017] Icon labels: Inlet pipe assembly 1000; Water tank 2000; Inner pipe 100; water inlet channel 110; second end 120; first water passage hole 121; second water passage hole 122; first end 130; connecting part 140; water passage part 150; stepped surface 160; Outer pipe 200; reflux channel 210; water outlet 220; first opening 230; second opening 240; water outlet section 250; first hole group 251; second hole group 252; 300mm plug; 310mm water-blocking section; Filter size 400; 500 anti-electric shock wall connector; 510 grounding terminal; 520 connector. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing 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 this utility model.

[0020] In the description of this utility model, the use of "first" and "second" is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features or the order of the technical features.

[0021] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0022] Electric water heaters typically have an inlet pipe at the bottom of the tank for filling. Water enters from the bottom and gradually fills the tank from bottom to top. Because cold water has a higher density than hot water, when cold water is poured in from the bottom, it concentrates in the lower part of the tank, while the hot water is located in the upper part. This causes temperature stratification, resulting in uneven water temperature. This leads to inconsistent hot water temperatures for users, resulting in a poor user experience. Furthermore, temperature stratification prolongs the heating time, causing additional energy consumption and increasing the cost of using hot water.

[0023] To address the aforementioned problems, some embodiments of this utility model propose an inlet pipe assembly 1000, suitable for water heaters. This assembly prevents the water flowing from the outlet 220 from having a unidirectional flow direction. By disturbing the existing hot water in the water tank 2000, it improves the uniformity of the water temperature in the tank 2000. See details below. Figures 1 to 6 The inlet pipe assembly 1000 is described below.

[0024] For ease of description, the following description will use the example of the inlet pipe assembly 1000 being installed at the bottom of the water tank 2000 of the water heater. (Refer to...) Figure 1 As shown in the embodiment of this utility model, the water inlet pipe assembly 1000 is located at the bottom of the water heater. One end of the assembly is connected to the inside of the water tank 2000, and the other end is connected to the water pipe for water supply, thereby realizing the water filling operation inside the water tank 2000, so that the water can fill the water tank 2000 from bottom to top.

[0025] Specifically, refer to Figure 2 and Figure 3 As shown in this embodiment of the invention, the water inlet pipe assembly 1000 includes an inner pipe 100, an outer pipe 200, and a plug 300. The outer pipe 200 is a hollow structure with an axially extending groove inside. The inner diameter of the groove is larger than the outer diameter of the inner pipe 100. Therefore, the inner pipe 100 passes through the groove of the outer pipe 200. In this embodiment, the inner pipe 100 has an axially extending water inlet channel 110 inside, and the inlet end of the water inlet channel 110 is connected to a water pipe for water supply.

[0026] Continue to refer to Figure 2 and Figure 3As shown, in this embodiment of the present invention, the inner tube 100 has a first end 130 and a second end 120, which are arranged sequentially along the water flow direction of the water inlet channel 110. When the water inlet pipe assembly 1000 is installed at the bottom of the water tank 2000, the second end 120 is the upper end of the inner tube 100, and the first end 130 is the lower end of the inner tube 100. Based on this, a first water passage hole 121 is provided on the upper end face of the inner tube 100. The first water passage hole 121 penetrates the upper end face of the inner tube 100, thereby communicating with the water inlet channel 110, and water in the water inlet channel 110 can flow out of the inner tube 100 through the first water passage hole 121. It should be noted that the water flowing out from the first water passage hole 121 flows along the axial direction of the inner tube 100.

[0027] Reference Figure 2 As shown, in this embodiment of the present invention, the circumferential wall of the inner tube 100 is provided with at least two second water passage holes 122. Specifically, there may be two, three, four, five, etc., for the second water passage holes 122, and this embodiment does not limit this. For ease of description, it is taken as an example that there are two second water passage holes 122. The two second water passage holes 122 are arranged at intervals along the circumference of the inner tube 100. The second water passage holes 122 penetrate the circumferential wall of the inner tube 100, thereby communicating with the water inlet channel 110. Water in the water inlet channel 110 can flow out of the inner tube 100 through the second water passage holes 122. It should be noted that the water flowing out of the second water passage holes 122 flows radially along the inner tube 100.

[0028] Reference Figure 3 As shown, in this embodiment of the invention, the outer tube 200 is sleeved around the outer periphery of the inner tube 100. The lower end of the outer tube 200 is connected to the first end 130 of the inner tube 100, and a plug 300 is installed at the upper end of the outer tube 200, thereby making the inner cavity of the outer tube 200 a sealed space. Water flowing out of the inner tube 100 from the first water passage 121 and the second water passage 122 flows into the inner cavity of the outer tube 200. In this embodiment, the inner peripheral wall of the outer tube 200 is spaced apart from the outer peripheral wall of the inner tube 100. Based on this, a return channel 210 extending axially along the outer tube 200 is formed between the inner peripheral wall of the outer tube 200 and the outer peripheral wall of the inner tube 100. A water outlet 220, connecting the inner cavity of the outer pipe 200, is provided on the peripheral wall of the outer pipe 200 near the second end 120 of the inner pipe 100. Therefore, the water flowing out of the inner pipe 100 from the first water passage 121 and the second water passage 122 will gradually flow towards the water outlet 220 and thus into the water tank 2000. It should be noted that the return channel 210 is part of the inner cavity of the outer pipe 200.

[0029] Combination Figure 4It is understood that in this embodiment of the invention, the plug 300 and the first water passage 121 are arranged opposite each other along the axial direction of the inner pipe 100. Therefore, the water flowing out of the first water passage 121 will flow upward, that is, flow towards the plug 300 and impact the plug 300. The water that bounces off the plug 300 flows downward and into the return channel 210. Part of the water flows directly out of the outlet 220, while the other part continues to flow downward until it fills the return channel 210 and overflows from the outlet 220 into the outer pipe 200. It is understood that the water that bounces back from the plug 300 and flows out of the second water passage 122 is not in the same direction. After the two water flows converge, turbulence will be generated, thus making the water flowing out of the outlet 220 multidirectional.

[0030] It is understood that by giving the water flowing out of the outlet 220 multiple directions, this embodiment of the utility model avoids the water flowing out of the outlet 220 of the outer pipe 200 having a single direction, enhances the disturbance of the newly injected water flow to the original hot water in the water tank 2000, thereby accelerating the heat exchange between the original hot water and the newly injected cold water, thereby improving the uniformity of the water temperature in the water tank 2000, preventing the occurrence of local low temperature zones, and improving the overall heating efficiency of the hot water in the water tank 2000.

[0031] Reference Figure 5 As shown, in this embodiment of the invention, the inner tube 100 includes a connecting portion 140 and a water-passing portion 150, which are arranged sequentially along the direction from the first end 130 toward the second end 120. The connecting portion 140 and the water-passing portion 150 are interconnected, and their inner cavities are interconnected to form a water inlet channel 110. A first water-passing hole 121 and a second water-passing hole 122 are formed in the water-passing portion 150. Figure 3 It is understood that in this embodiment, the outer peripheral wall of the connecting portion 140 abuts against the inner peripheral wall of the outer pipe 200, and the water-passing portion 150 is spaced apart from the inner peripheral wall of the outer pipe 200. Based on this, the upper end of the connecting portion 140, the inner peripheral wall of the outer pipe 200, and the outer peripheral wall of the water-passing portion 150 form a return channel 210, and the opening of the return channel 210 is arranged facing upward.

[0032] Reference Figure 3 and Figure 5As shown, in this embodiment of the invention, both the connecting portion 140 and the water-passing portion 150 are columnar, and are coaxially arranged. The outer diameter of the connecting portion 140 is larger than that of the water-passing portion 150; in other words, along the radial direction of the outer pipe 200, the outer peripheral wall of the connecting portion 140 is located on the outer side relative to the outer peripheral wall of the water-passing portion 150. The outer diameter of the connecting portion 140 is matched with the inner diameter of the outer pipe 200, thus allowing for an interference fit between the connecting portion 140 and the outer pipe 200. The outer diameter of the water-passing portion 150 is smaller than the inner diameter of the outer pipe 200; therefore, a gap exists between the outer peripheral wall of the water-passing portion 150 and the inner peripheral wall of the outer pipe 200, and this gap forms the space of the return channel 210.

[0033] Continue to refer to Figure 5 As shown, in this embodiment of the invention, a stepped surface 160 is provided between the outer peripheral wall of the connecting portion 140 and the outer peripheral wall of the water-passing portion 150. One end of the stepped surface 160 is transitionally connected to the outer peripheral wall of the connecting portion 140, and the other end is transitionally connected to the outer peripheral wall of the water-passing portion 150. In this embodiment, the stepped surface 160 can be inclined to avoid forming an overly sharp edge at the connection between the stepped surface 160 and the connecting portion 140, thereby preventing damage to the inner peripheral wall of the outer pipe 200 during the process. It is understood that the stepped surface 160, the outer peripheral wall of the water-passing portion 150, and the inner peripheral wall of the outer pipe 200 cooperate to form a return channel 210.

[0034] Reference Figure 2 As shown, in this embodiment of the invention, the upper end of the outer tube 200 is provided with a first opening 230, and the lower end is provided with a second opening 240. The first opening 230 and the second opening 240 are respectively connected to the inner cavity of the outer tube 200. Figure 3 It is understood that the connecting part 140 passes through the second opening 240. Specifically, when assembling the outer tube 200, the inner tube 100 can be inserted into the interior of the outer tube 200 through the second opening 240, and the connecting part 140 can be tightly fitted with the inner peripheral wall of the outer tube 200.

[0035] Reference Figure 5 As shown in this embodiment of the invention, the plug 300 is installed at the first opening 230. Specifically, the plug 300 and the first opening 230 can be fastened together by fasteners, welding, interference fit, etc., and this embodiment does not limit this. The plug 300 includes a water-blocking portion 310 spaced apart from the first water passage 121. The water-blocking portion 310 can be configured as a baffle covering the first opening 230, and can close the first opening 230, thereby reflecting all the water flow from the first water passage 121 back.

[0036] Understandably, the inventors, through numerous experiments, discovered that when the distance between the first water passage hole 121 and the water-blocking part 310 is too small, the water flowing out of the first water passage hole 121 will be obstructed by the water-blocking part 310, making it difficult to discharge smoothly; when the distance between the first water passage hole 121 and the water-blocking part 310 is too large, the water flow from the first water passage hole 121 will be excessively dispersed, which is not conducive to the water-blocking part 310 rebounding water flow to form an effective backflow. Therefore, referring to... Figure 5 As shown, in this embodiment of the present invention, the distance between the first water passage hole 121 and the water blocking part 310 is L, which satisfies: 7mm≤L≤11mm. For example, the value of L is 7mm, 8mm, 9.5mm, 10mm, etc.

[0037] By reasonably limiting the range of L, this embodiment of the utility model not only ensures that the water in the water inlet channel 110 can flow smoothly out of the first water passage 121, but also reduces the possibility of the water flowing out of the first water passage 121 spreading in the process of flowing towards the water blocking part 310. This allows the water blocking part 310 to more fully bounce the water, so that the bounced water can have sufficient flow velocity to merge with the water flowing out of the second water passage 122 to form turbulence.

[0038] Continue to refer to Figure 5 As shown in this embodiment of the invention, the minimum gap between the inner circumferential wall of the outer pipe 200 and the outer circumferential wall of the water passage 150 is W, satisfying the condition: 1mm ≤ W ≤ 2mm. For example, the value of W is 1mm, 1.1mm, 1.4mm, 1.5mm, 1.8mm, and 2mm, etc. If W is less than 1mm, the return channel 210 is too narrow, which will hinder the smooth flow of water rebounded by the water blocking part 310. If W is greater than 2mm, the width of the return channel 210 is too wide, which will cause the outer pipe 200 to increase in size and occupy more installation space; or cause the inner pipe 100 to become smaller, reducing the water output efficiency.

[0039] Therefore, by reasonably limiting the range of W, it is possible not only to ensure that the water flow rebounding from the water-blocking part 310 flows smoothly into the return channel 210 and merges with the water flow flowing out from the second water passage 122, but also to ensure that the dimensions of the inner pipe 100 and the outer pipe 200 are reasonable, thus ensuring that the water output efficiency meets the requirements.

[0040] Continue to refer to Figure 5As shown in this embodiment of the invention, both the first water passage 121 and the second water passage 122 are circular holes. The minimum diameter of the first water passage 121 is D1, and the minimum diameter of the second water passage 122 is D2, satisfying the condition: 0mm < D1 - D2 ≤ 1mm. For example, the values ​​of D1 - D2 are 0.1mm, 0.4mm, 0.5mm, 0.8mm, and 1mm, etc. If D1 - D2 = 0, then the diameters of the first water passage 121 and the second water passage 122 are equal. However, since the first water passage 121 is located higher than the second water passage 122, the water needs to flow out of the first water passage 121 at a higher velocity. Therefore, under the condition that the two holes have the same diameter, the water output of the first water passage 121 will be less than that of the second water passage 122, resulting in a smaller water flow rate rebounded by the water blocking part 310, making it difficult to generate turbulence when it converges with the water flow flowing out of the second water outlet 220. If D1-D2 is greater than 1mm, the wall thickness of the inner tube 100 will be significantly reduced, which will affect the overall strength of the inner tube 100.

[0041] Therefore, by reasonably limiting the range of values ​​for D1-D2, not only can the outflow of the first water passage 121 be increased, allowing the water flow rebounding through the water baffle 310 and the water flow from the second water passage 122 to more effectively and fully form turbulence when they converge, but it also avoids the water flow from the second water passage 122 being too small to form turbulence with the water flow rebounding through the water baffle 310. Furthermore, it prevents the wall of the inner tube 100 from being thinned due to excessive perforation, ensuring the structural stability and durability of the inner tube 100 during use.

[0042] Reference Figure 5 As shown in this embodiment of the invention, the outer tube 200 has a plurality of water outlet holes 220 spaced apart on its peripheral wall. These water outlet holes 220 are arranged in an array on the peripheral wall of the outer tube 200, collectively forming a water outlet section 250. In one example, two second water passage holes 122 are offset from the water outlet section 250 along the axial direction of the inner tube 100. Specifically, the second water passage holes 122 can be located above the uppermost water outlet hole 220 among the plurality of water outlet holes 220, or below the lowermost water outlet hole 220 among the plurality of water outlet holes 220. In another embodiment, the two second water passage holes 122 are offset from the water outlet section 250 along the circumferential direction of the inner tube 100. In another embodiment, the two second water passage holes 122 and the water outlet 250 are offset along the axial direction of the inner tube 100, and the two second water passage holes 122 and the water outlet 250 are offset along the circumferential direction of the inner tube 100.

[0043] Based on this, the water flowing out from the second water passage 122 will first collide with the inner circumferential wall of the outer pipe 200. After the collision, part of the water flows to the water outlet 220, and the other part flows to the water baffle 310. This further enhances the multidirectionality of the water flow, thereby aggravating the turbulence effect and thus strengthening the disturbance effect of the water flowing out from the water outlet 220 on the original hot water in the water tank 2000.

[0044] Continue to refer to Figure 5 As shown, in this embodiment of the present invention, the water outlet 250 includes at least two sets of holes, which are arranged at intervals from bottom to top. The lowermost set of holes is the first set of holes 251. For ease of description, the following description uses the example of the water outlet 250 including two sets of holes. In this embodiment of the present invention, the water outlet 250 includes a first set of holes 251 and a second set of holes 252, which are arranged sequentially from bottom to top. Both the first set of holes 251 and the second set of holes 252 include multiple water outlet holes 220. In this embodiment, the water inlet pipe assembly 1000 also includes a filter screen 400. Specifically, the filter screen 400 is sleeved on the outer periphery of the outer pipe 200 and covers all the water outlet holes 220 of the first set of holes 251. It is understandable that insoluble impurities in water have a large weight and these impurities tend to settle naturally downwards. Therefore, in this embodiment, covering the first hole group 251 with the filter screen 400 can meet the filtration requirements and minimize the impact of the filter screen 400 on the water output efficiency, thereby ensuring that the water output section 250 has a high water output efficiency. Reference Figure 2 and Figure 6 As shown in this embodiment of the invention, to ensure the safety of the water heater and prevent electric shock to users due to product leakage, the inlet pipe assembly 1000 further includes an anti-electric shock wall connector 500, wherein the first end 130 of the inner pipe 100 is connected to the anti-electric shock wall connector 500. Furthermore, the anti-electric shock wall connector 500 is also provided with a grounding terminal 510, a portion of which protrudes from the peripheral wall of the anti-electric shock wall connector 500, thereby grounding via an electrical wire. The end of the anti-electric shock wall connector 500 facing away from the inner pipe 100 is provided with a connector 520 for connection to a water pipe.

[0045] This utility model also proposes a water heater, including a water tank 2000 and an inlet pipe assembly 1000 as described in the above embodiment. In this embodiment, the water tank 2000 can be vertical or horizontal. Taking a vertical water tank 2000 as an example, the inlet pipe assembly 1000 is arranged vertically and passes through the bottom of the water tank 2000, thereby realizing water filling from bottom to top. In this embodiment, the water heater can be an electric water heater or an air source water heater. Specifically, the installation height of the water outlet 220 provided on the peripheral wall of the outer pipe 200 is higher than the bottom surface of the inner cavity of the water tank 2000 to ensure smooth water filling.

[0046] The water heater of this embodiment uses the inlet pipe assembly 1000 of the above embodiment. An outer pipe 200 is sleeved around the outer periphery of the inner pipe 100. The inner peripheral wall of the outer pipe 200 is spaced apart from the outer peripheral wall of the inner pipe 100, thus defining a return channel 210. A plug 300 connected to one side of the outer pipe 200 is positioned opposite to the first water passage 121. The plug 300 can bounce the water flowing from the first water passage 121 back to the return channel 210, where it flows with the water flowing from the second water passage 122. The confluence generates turbulence, preventing the water flowing out of the outlet 220 of the outer pipe 200 from flowing in a single direction. This enhances the disturbance of the existing hot water in the water tank 2000 by the newly injected water, thereby accelerating the heat exchange between the existing hot water and the newly injected cold water. This improves the uniformity of the water temperature in the water tank 2000, prevents the occurrence of local low-temperature zones, and makes the outlet water temperature of the water tank 2000 more stable. This improves the overall heating efficiency of the hot water in the water tank 2000, enhances the stability of the outlet water temperature, and ultimately improves the user experience. Since the water heater adopts all the technical solutions of the water inlet pipe assembly 1000 of the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0047] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A water inlet pipe assembly, characterized in that, include: The inner tube is provided with a water inlet channel. The inner tube has a first end and a second end arranged sequentially along the water flow direction of the water inlet channel. The end face of the second end is provided with a first water passage hole. The peripheral wall of the inner tube is provided with a second water passage hole. The first water passage hole and the second water passage hole are respectively connected to the water inlet channel. An outer tube is fitted around the outer periphery of the inner tube and connected to the first end. The inner peripheral wall of the outer tube is spaced apart from the outer peripheral wall of the inner tube to define a return channel. The peripheral wall of the outer tube is provided with a water outlet hole that communicates with the return channel. A plug is connected to one end of the outer tube near the second end, and the plug is configured to guide water flowing from the first water passage to the return channel.

2. The water inlet pipe assembly according to claim 1, characterized in that, The inner tube includes a connecting portion and a water-passing portion arranged sequentially from the first end to the second end. The connecting portion and the water-passing portion are connected to each other and jointly define the water inlet channel. The connecting portion abuts against the inner peripheral wall of the outer tube. The water-passing portion is spaced apart from the inner peripheral wall of the outer tube to form the return channel. The first water-passing hole and the second water-passing hole are provided in the water-passing portion.

3. The water inlet pipe assembly according to claim 2, characterized in that, The connecting part and the water-passing part are coaxially arranged. The outer diameter of the connecting part is larger than the outer diameter of the water-passing part. A stepped surface is provided between the outer peripheral wall of the connecting part and the outer peripheral wall of the water-passing part. One end of the stepped surface is connected to the outer peripheral wall of the connecting part, and the other end is connected to the outer peripheral wall of the water-passing part.

4. The water inlet pipe assembly according to claim 2, characterized in that, The outer tube has a first opening and a second opening at both ends, the plug is installed at the first opening, the plug includes a water-blocking part covering the first opening, the water-blocking part is spaced apart from the first water passage hole, and the connecting part passes through the second opening.

5. The water inlet pipe assembly according to claim 4, characterized in that, The distance between the first water passage hole and the water-blocking part is L, which satisfies: 7mm≤L≤11mm.

6. The water inlet pipe assembly according to claim 2, characterized in that, The minimum gap between the inner circumferential wall of the outer pipe and the outer circumferential wall of the water passage part is W, which satisfies: 1mm≤W≤2mm.

7. The water inlet pipe assembly according to claim 1, characterized in that, The first water passage and the second water passage are circular holes. The minimum diameter of the first water passage is D1, and the minimum diameter of the second water passage is D2, satisfying: 0mm < D1 - D2 ≤ 1mm.

8. The water inlet pipe assembly according to claim 1, characterized in that, The water outlet is provided in multiple locations, and the multiple water outlets are distributed at intervals on the outer peripheral wall of the outer tube to form a water outlet section. The second water passage is provided in at least two locations, and the at least two second water passages are arranged at intervals along the circumference of the inner tube. The at least two second water passages are offset from the water outlet section along the axial direction of the inner tube, and / or offset from the water outlet section along the circumference of the inner tube.

9. The water inlet pipe assembly according to claim 8, characterized in that, The water outlet section includes at least two groups of holes arranged sequentially from the first end to the second end. Each group of holes includes a plurality of water outlet holes. The group of holes closer to the first end is the first group of holes. The water inlet pipe assembly also includes a filter screen, which is sleeved on the outer periphery of the outer pipe and covers all the water outlet holes of the first group of holes.

10. A water heater, characterized in that, It includes a water tank and an inlet pipe assembly as described in any one of claims 1 to 9, wherein the inlet pipe assembly is arranged in a vertical direction and connected to the water tank.

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