Temperature sensing blind tube, electric heating element and water heater

Abstract

This utility model belongs to the technical field of hot water equipment, specifically disclosing a temperature-sensing blind tube, an electric heating assembly, and a water heater. The water heater includes an electric heating assembly, which in turn includes a temperature-sensing blind tube. The temperature-sensing blind tube includes a first tube and a second tube. The first tube includes an internally threaded section and a sleeve section. The nominal diameter of the internally threaded section is smaller than the inner diameter of the sleeve section; the nominal diameter of the externally threaded section is larger than the outer diameter of the sleeve section, and the outer diameter of the sleeve section is smaller than the nominal diameter of the internally threaded section. Multiple internally threaded sections are spaced apart on the first tube, or multiple externally threaded sections are spaced apart on the second tube, and the internally threaded sections and externally threaded sections are threadedly connected. The length of the above-mentioned temperature-sensing blind tube is adjustable, and the adjustment is simple and quick, with a stable connection.

Description

Technical Field

[0001] This utility model relates to the field of hot water equipment technology, and in particular to a temperature sensing blind tube, an electric heating component, and a water heater. Background Technology

[0002] Water heaters are common household appliances. They are categorized into gas water heaters, electric water heaters, air source water heaters, and integrated wall-mounted air source heat pump water heaters. Electric water heaters and air source water heaters typically include an electric heating element, which consists of a heating element and a temperature sensor. To prevent direct contact between the temperature sensor and the hot water, the heating element also includes a blind temperature sensor tube, inside which the temperature sensor is located.

[0003] Because water molecules in hot water have higher energy and move faster, they disperse more quickly, resulting in a lower density than cold water. When heating water in a tank, the hot water floats on the surface of the cold water. Therefore, the temperature probe should be placed as close as possible to the water surface in the tank to accurately monitor temperature changes in real time. However, the current blind temperature probes are not adjustable in length, which fails to meet the assembly requirements when installed in tanks of different capacities, leading to poor applicability.

[0004] To address the aforementioned issue of poor adaptability, a temperature probe blind tube has been proposed in related technologies. This tube comprises a fixed section and a telescopic section, with the telescopic section threadedly connected to the fixed section. The length of the temperature probe blind tube can be adjusted by screwing on the telescopic section. However, this adjustment method is only suitable when the required length difference of the temperature probe blind tube is small. If the length difference is large, the adjustment time of the temperature probe blind tube will be too long, thus affecting efficiency. Utility Model Content

[0005] One of the technical problems solved by this utility model is to provide a temperature probe blind tube that can adjust its length according to the capacity of the water tank, and the adjustment method is simple and efficient.

[0006] The second technical problem solved by this utility model is to provide an electric heating component that can be used in water tanks of different capacities.

[0007] The third technical problem solved by this utility model is to provide a water heater that can accurately monitor changes in water temperature.

[0008] The first technical problem mentioned above is solved by the following technical solution:

[0009] A temperature-sensing blind tube includes a first tube, a second tube, and a first sealing element. The first tube includes an internally threaded section and a sleeve section, wherein the nominal diameter of the internally threaded section is smaller than the inner diameter of the sleeve section. The second tube is inserted into the first tube, and the second tube includes an externally threaded section and an insertion section, wherein the nominal diameter of the externally threaded section is larger than the outer diameter of the insertion section, and the outer diameter of the insertion section is smaller than the nominal diameter of the internally threaded section. Multiple internally threaded sections are spaced apart on the first tube, or multiple externally threaded sections are spaced apart on the second tube, and the internally threaded sections and the externally threaded sections are threadedly connected.

[0010] Compared with the prior art, the temperature-sensing blind tube of this utility model has the following advantages: The temperature-sensing blind tube includes a first tube and a second tube with threaded engagement. By rotating the second tube relative to each other, the internally threaded tube segment on the first tube engages with the externally threaded tube segment at different positions on the second tube, or the internally threaded tube segment at different positions on the first tube engages with the externally threaded tube segment on the second tube, thereby achieving the adjustment of the length of the temperature-sensing blind tube. The number and position of the internally and externally threaded tube segments can be determined in advance according to commonly used water tanks of different sizes, so that when adjusting the length of the temperature-sensing blind tube, ineffective adjustment parts can be skipped, thereby improving the length adjustment efficiency of the temperature-sensing blind tube. Furthermore, by constraining the nominal diameter of the internally threaded tube segment to be smaller than the inner diameter of the sleeve segment, and the nominal diameter of the externally threaded tube segment to be larger than the outer diameter of the insertion tube segment, and the outer diameter of the insertion tube segment to be smaller than the nominal diameter of the internally threaded tube segment, after the externally threaded tube segment separates from the internally threaded tube segment, the insertion tube segment can smoothly pass through the internally threaded tube segment, thereby achieving rapid adjustment of the length of the temperature-sensing blind tube.

[0011] In one embodiment, the first pipe is provided with a plurality of internally threaded pipe segments and a plurality of sleeve segments at intervals, wherein the lengths of the plurality of sleeve segments are all the same or at least some of the sleeve segments have different lengths.

[0012] In one embodiment, the temperature probe blind tube further includes a first seal for sealing the insertion gap between the first tube and the second tube.

[0013] In one embodiment, the insertion tube segment is elastically connected with a snap fastener, and the sleeve segment is provided with an annular groove. When the snap fastener is placed in the groove, the external threaded tube segment is screwed to the internal threaded tube segment.

[0014] In one embodiment, the cannula segment is provided with a mounting hole, and the spring clip is elastically connected to the cannula segment through an elastic element disposed in the mounting hole; when the spring clip is compressed, the spring clip can be accommodated in the mounting hole.

[0015] In one embodiment, the sleeve segment has an outwardly protruding annular rib, the slot is formed within the rib and is annular; and / or, the groove wall of the slot smoothly transitions to the inner wall of the sleeve segment.

[0016] In one embodiment, the first tube is provided with a plurality of internally threaded tube segments and a plurality of sleeve segments at intervals, and the externally threaded tube segments and the spring clips are both located at the end of the second tube that is inserted into the first tube.

[0017] The second technical problem mentioned above is solved by the following technical solution:

[0018] An electric heating assembly includes a base, an electric heating element, a temperature probe, and the aforementioned temperature probe blind tube. Both the temperature probe blind tube and the electric heating element are fixed on the base. One closed end of the temperature probe blind tube is located away from the base, and the temperature probe is located inside the temperature probe blind tube and close to the closed end of the temperature probe blind tube.

[0019] Compared with the prior art, the electric heating component of this utility model has the following advantages: Since the length of the temperature probe blind tube is adjustable, the electric heating component can be used for water tanks of different capacities. Because multiple segments of internally threaded pipe are arranged at intervals on the first tube or multiple segments of externally threaded pipe are arranged at intervals on the second tube, when the internally threaded pipe segments and externally threaded pipe segments are staggered, the second tube can be pushed into or pulled out of the first tube along the length direction of the temperature probe blind tube, thereby improving the adjustment efficiency of the length of the temperature probe blind tube; and the first tube and the second tube are still threadedly connected, with a large contact area, high connection stability, and a long service life of the electric heating component.

[0020] In one embodiment, the electric heating assembly further includes an electronic anode rod and a nut. The base has a socket, one end of the electronic anode rod is inserted into the socket, and nuts are threaded to both ends of the electronic anode rod located in the socket.

[0021] The third technical problem mentioned above is solved by the following technical solution:

[0022] A water heater, comprising a water tank and the aforementioned electric heating assembly, wherein the electric heating element and the temperature sensing blind tube are inserted into the water tank.

[0023] Compared with the prior art, the water heater described in this utility model has the following advantages: by adjusting the length of the temperature sensing blind tube, the position of the temperature measuring probe set in the temperature sensing blind tube can be adjusted, thereby accurately monitoring water temperature changes, and the length of the temperature sensing blind tube is easy to adjust. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of the temperature probe blind tube provided in the embodiment of this utility model;

[0025] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0026] Figure 3 This is a schematic diagram of the exploded structure of an electric heating component.

[0027] Label Explanation:

[0028] 1. Temperature probe blind tube; 11. First tube; 111. Sleeve section; 112. Internally threaded tube section; 113. Rib; 114. Slot; 12. Second tube; 121. Inserted tube section; 122. Externally threaded tube section; 123. Spring snap; 124. Elastic element; 13. First sealing element; 2. Base; 21. Insertion hole; 3. Temperature probe; 4. Heating element; 5. Electronic anode rod; 6. Magnesium rod; 7. Second sealing element; 8. Plug; 9. Nut. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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 application.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] refer to Figure 1 and Figure 2 As shown, an embodiment of this utility model proposes a temperature probe blind tube 1, including a first tube 11 and a second tube 12 with threaded engagement. The second tube 12 is inserted into the first tube 11, and one end of the first tube 11 and the second tube 12 is closed away from the other. The first tube 11 includes an internally threaded tube section 112 and a sleeve section 111, and the nominal diameter of the internally threaded tube section 112 is smaller than the inner diameter of the sleeve section 111. The second tube 12 includes an externally threaded tube section 122 and an insertion section 121, and the nominal diameter of the externally threaded tube section 122 is larger than the outer diameter of the insertion section 121, and the outer diameter of the insertion section 121 is smaller than the nominal diameter of the internally threaded tube section 112. The first tube 11 is provided with multiple internally threaded tube sections 112 at intervals, or the second tube 12 is provided with multiple externally threaded tube sections 122 at intervals. The first tube 11 and the second tube 12 are connected by the interlocking internally threaded tube sections 112 and externally threaded tube sections 122.

[0034] The aforementioned temperature probe blind tube 1 includes a first tube 11 and a second tube 12 with threaded engagement. By rotating the second tube 12 relative to each other, the internal threaded tube section 112 on the first tube 11 engages with the external threaded tube section 122 at different positions on the second tube 12, or the internal threaded tube section 112 at different positions on the first tube 11 engages with the external threaded tube section 122 on the second tube 12, thereby achieving the adjustment of the length of the temperature probe blind tube 1.

[0035] Taking the first pipe 11 as an example, which includes multiple internally threaded pipe sections 112 spaced apart, and the second pipe 12 as an example, where the second pipe 12 only includes one externally threaded pipe section 122, then when adjusting the length of the temperature probe blind pipe 1, it is only necessary to rotate the first pipe 11 or the second pipe 12 when the internally threaded pipe section 112 and the externally threaded pipe section 122 are engaged. When the externally threaded pipe section 122 is misaligned with one of the internally threaded pipe sections 112, since the nominal diameter of the internally threaded pipe section 112 is smaller than the inner diameter of the sleeve section 111, and the nominal diameter of the externally threaded pipe section 122 is also smaller... The outer diameter of the external threaded tube section 122 is greater than that of the insertion tube section 121, and the outer diameter of the insertion tube section 121 is smaller than the nominal diameter of the internal threaded tube section 112. This allows the insertion tube section 121 to pass smoothly through the internal threaded tube section 112 after the external threaded tube section 122 is separated from the internal threaded tube section 112. In other words, after the external threaded tube section 122 is separated from the sleeve section 111, the external threaded tube section 122 can be directly pushed or pulled towards another internal threaded tube section 112 along the length direction of the temperature probe blind tube 1 without continuous screwing, thereby achieving rapid adjustment of the length of the temperature probe blind tube.

[0036] Moreover, when the lengths of the first tube 11 and the second tube 12 are determined, they still maintain a threaded connection, resulting in a large contact area, a more stable connection, and less wobbling.

[0037] In some embodiments, the first pipe 11 is provided with a plurality of internally threaded pipe sections 112 and a plurality of sleeve sections 111 at intervals, and the lengths of the plurality of sleeve sections 111 are all the same or at least some of the sleeve sections 111 have different lengths. That is to say, the length of the sleeve section 111 is determined according to the size of the actual matching water tank, and this application does not make it mandatory.

[0038] In some embodiments, to prevent liquid from entering the temperature probe blind tube 1 and affecting the service life of the temperature probe 3 located inside the temperature probe blind tube 1, the first tube 11 and the second tube 12 are sealed together. Specifically, the temperature probe blind tube 1 also includes a first sealing member 13, which is used to seal the insertion gap between the first tube 11 and the second tube 12.

[0039] In some embodiments, the first sealing element 13 is a sealing ring. After the length of the temperature probe blind tube 1 is determined, the sealing ring is welded and fixed to the first tube 11 and the second tube 12 to achieve sealing.

[0040] In some embodiments, the first sealant 13 may also be a high-temperature resistant sealant. Once the length of the temperature probe blind tube 1 is determined, the high-temperature resistant sealant is injected into the joint between the first tube 11 and the second tube 12 to achieve a seal.

[0041] In the current embodiment, considering the aesthetics of the temperature probe blind tube 1, and to reduce the exposure of the internally threaded pipe section 112 or the externally threaded pipe section 122, only one section of the externally threaded pipe section 122 is provided, while multiple sections of the internally threaded pipe section 112 are provided. Specifically, the sleeve section 111 and the internally threaded pipe section 112 are staggered along the axial direction of the first pipe 11. It can be understood that when only one section of the externally threaded pipe section 122 is provided, when the second pipe 12 moves relative to the first pipe 11, the first sealing element 13 is fitted onto the insertion pipe section 121, reducing the deformation degree of the first sealing element 13 and helping to extend the service life of the first sealing element 13. At the same time, since the temperature probe blind tube 1 is generally vertically installed in the water tank, considering the stability of the temperature probe blind tube 1, the center of gravity of the temperature probe blind tube 1 should not be too high. Therefore, the first pipe 11 is located at the bottom when in use, and the end of the second pipe 12 away from the first pipe 11 is closed. Specifically, in order to make the temperature probe blind tube 1 have a longer length, the externally threaded pipe section 122 is provided at the end of the second pipe 12 inserted into the first pipe 11. For example, the internally threaded pipe section 112 is provided in three segments at intervals on the first pipe 11.

[0042] Let the length of the internally threaded pipe section 112 be L1 and the length of the externally threaded pipe section 122 be L2, where L≥L1. Under the premise that the length of the internally threaded pipe section 112 is constant, the internally threaded pipe section 112 can completely mesh with the externally threaded pipe section 122, and the connection between the first pipe 11 and the second pipe 12 is more stable. To further improve the stability of the connection between the first tube 11 and the second tube 12, and to achieve precise adjustment of the length of the temperature probe blind tube 1, a spring buckle 123 is elastically connected to the insertion section 121. The spring buckle 123 is located on the insertion section 121 adjacent to the external threaded tube section 122, that is, the spring buckle 123 and the external threaded tube section 122 are both located at the end of the second tube 12 inserted into the first tube 11. An annular groove 114 is provided on the sleeve section 111. The spring buckle 123 tends to remain inserted in the groove 114. When the spring buckle 123 is placed in the groove 114, the external threaded tube section 122 is screwed into the internal threaded tube section 112, thereby achieving axial positioning of the first tube 11 and the second tube 12.

[0043] In this embodiment, in order to form a groove 114 while ensuring the structural strength of the first tube 11 under the premise of limited wall thickness, a protruding annular rib 113 is formed on the sleeve section 111, and the groove 114 is formed in the rib 113. The insertion section 121 has a mounting hole along the radial direction, and the spring buckle 123 is elastically connected to the first tube 11 through an elastic element 124 disposed in the mounting hole. When the spring buckle 123 is compressed, the spring buckle 123 can be accommodated in the mounting hole.

[0044] Specifically, the groove wall of the slot 114 smoothly transitions to the inner wall of the sleeve section 111, so that the spring clip 123 can smoothly enter or disengage from the slot 114 when subjected to external force, thereby realizing the adjustment of the length of the temperature probe blind tube 1.

[0045] In other embodiments, the spring clip 123 may also be made of a flexible material, which helps to reduce the thickness of the cannula section 121.

[0046] refer to Figure 3 As shown, an embodiment of this utility model also proposes an electric heating component, including the above-mentioned temperature probe blind tube 1, as well as a base 2, a temperature probe 3 and an electric heating tube 4. The electric heating tube 4 and the temperature probe blind tube 1 are both fixed on the base 2. The shape of the electric heating tube 4 is not limited. For example, the electric heating tube 4 can be U-shaped, spiral-shaped, etc. The temperature probe 3 is set inside the temperature probe blind tube 1 and close to the closed end of the temperature probe blind tube 1.

[0047] Because the length of the temperature probe blind tube 1 is adjustable, the electric heating component can be used in water tanks of different capacities. Furthermore, because the temperature probe blind tube 1 has good sealing performance and the connection between the first tube 11 and the second tube 12 is highly stable, the electric heating component has a long service life.

[0048] Specifically, the base 2 has a clearance hole for connecting the temperature measuring blind tube. When assembling the electric heating assembly, the temperature measuring probe 3 can be inserted into the temperature measuring blind tube 1 through the clearance hole.

[0049] In addition, the electric heating assembly includes at least one of an electronic anode rod 5 and a magnesium rod 6, which are fixed to the base 2. The electronic anode rod 5 provides a protective current through the water heater's control board to protect the inner tank from corrosion. The electronic anode rod 5 is not limited to being made of titanium, while the magnesium rod 6 protects the inner tank by sacrificing magnesium. When the electric heating assembly includes both electronic anode rod 5 and magnesium rod 6, if there is a power outage or the electronic anode rod 5 fails, the magnesium rod 6 can protect the inner tank; conversely, when the magnesium rod 6 is exhausted, the electronic anode rod 5 can protect the inner tank.

[0050] In this embodiment, the connection method between the magnesium rod 6 and the base 2 is not limited, and the electronic anode rod 5 and the base 2 are detachably connected. Specifically, the electronic anode rod 5 is inserted into the base 2, and one end of the electronic anode rod 5 inserted into the base 2 is provided with an external thread. The base 2 is provided with a socket 21 for inserting the electronic anode rod 5. One end of the electronic anode rod 5 is inserted into the socket 21 and fixed by a nut 9 that is sleeved on the electronic anode rod 5 and threadedly connected to it. Specifically, in order to achieve a stable connection between the electronic anode rod 5 and the base 2, nuts 9 are threadedly connected to both ends of the electronic anode plate located at the socket 21.

[0051] Based on this, in order to achieve a seal between the electronic anode rod 5 and the base 2 and reduce the possibility of water leakage, a second sealing element 7 is also fitted on the electronic anode rod 5. Two second sealing elements 7 are provided: one is clamped on the side of the nut 9 and the base 2 facing away from the temperature probe tube 1, and the other is clamped on the side of the nut 9 and the base 2 facing the temperature probe tube 1. More specifically, the side of the base 2 facing away from the temperature probe tube 1 has an inner fixing groove coaxial with the insertion hole 21, and the side of the base 2 facing the temperature probe tube 1 has an outer fixing groove coaxial with the insertion hole 21. The two second sealing elements 7 are located in the inner fixing groove and the outer fixing groove, respectively. The second sealing elements 7 deform under the pressure of the nut 9, thereby better abutting against the groove wall of the inner or outer fixing groove, resulting in better sealing performance.

[0052] When assembling the electronic anode rod 5, first install the two second sealing parts 7 into the inner fixing slot and the outer fixing slot respectively. After inserting the electronic anode rod 5 with a nut 9 into the insertion hole 21, put another nut 9 on one end of the electronic anode rod 5 inserted into the insertion hole 21. Lock the electronic anode rod 5 onto the base 2 with the nut 9. At this time, the electronic anode rod 5 and the base 2 form an inner and outer double interlocking structure, which makes the connection more stable and has good waterproof performance.

[0053] In this embodiment, in order to accommodate the nut 9 located on the side of the base 2 facing away from the temperature probe blind tube 1, the base 2 is configured to be recessed towards the temperature probe blind tube 1. In addition, the electric heating assembly also includes a plug 8, which seals the opening of the base 2 facing away from the temperature probe blind tube 1 to reduce the possibility of the nut 9 accidentally falling off the electronic anode rod 5.

[0054] This utility model also proposes a water heater, the type of which is not limited, and can be a heat pump water heater or an electric water heater. The water heater includes a water tank and the above-mentioned electric heating components. The water tank includes an inner tank and an outer shell. The base 2 is located in the sandwich formed by the inner tank and the outer shell and is disposed at the bottom of the outer shell. The temperature probe blind tube 1, the electric heating tube 4, the electronic anode rod 5, and the magnesium rod 6 (if present) in the electric heating components are all inserted into the inner tank.

[0055] The water heater also includes a control circuit board, which is connected to the electronic anode rod 5, magnesium rod 6 and inner tank by wires to form an electronic circuit to protect the inner tank.

[0056] Since the water heater includes the aforementioned electric heating element, it possesses all the advantages of an electric heating element, which will not be elaborated further here.

[0057] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0058] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A temperature probe blind pipe, characterized in that, include: The first pipe (11) includes an internally threaded pipe section (112) and a sleeve section (111), wherein the nominal diameter of the internally threaded pipe section (112) is smaller than the inner diameter of the sleeve section (111); The second tube (12) is inserted into the first tube (11). The second tube (12) includes an externally threaded tube section (122) and an inserted tube section (121). The nominal diameter of the externally threaded tube section (122) is greater than the outer diameter of the inserted tube section (121), and the outer diameter of the inserted tube section (121) is smaller than the nominal diameter of the internally threaded tube section (112). The first pipe (11) is provided with a plurality of internally threaded pipe segments (112) at intervals, or the second pipe (12) is provided with a plurality of externally threaded pipe segments (122) at intervals, and the internally threaded pipe segments (112) and the externally threaded pipe segments (122) are threadedly connected.

2. The temperature sensing blind tube of claim 1, wherein, The first pipe (11) is provided with a plurality of internally threaded pipe segments (112) and a plurality of sleeve segments (111) at intervals, and the lengths of the plurality of sleeve segments (111) are all the same or at least some of the sleeve segments (111) have different lengths.

3. A temperature probe blind tube according to claim 1 or 2, c h a r a c t e r i z e d in that The temperature probe blind tube also includes a first sealing element (13), which is used to seal the insertion gap between the first tube (11) and the second tube (12).

4. The temperature sensing blind tube according to claim 1 or 2, wherein, The insertion tube section (121) is elastically connected with a spring buckle (123), and the sleeve section (111) is provided with an annular groove (114). When the spring buckle (123) is placed in the groove (114), the external threaded tube section (122) is screwed to the internal threaded tube section (112).

5. The temperature sensing blind tube of claim 4, wherein, The insertion tube section (121) is provided with an installation hole, and the spring buckle (123) is elastically connected to the insertion tube section (121) through an elastic element (124) provided in the installation hole; when the spring buckle (123) is pressed, the spring buckle (123) can be accommodated in the installation hole.

6. The temperature sensing blind tube of claim 4, wherein, The sleeve section (111) has an outwardly protruding annular rib (113) formed therein, and the groove (114) is formed inside the rib (113) and is set as annular; and / or, the groove wall of the groove (114) smoothly transitions with the inner wall of the sleeve section (111).

7. The temperature sensing blind tube of claim 4, wherein, The first tube (11) is provided with a plurality of internally threaded tube segments (112) and a plurality of sleeve segments (111) at intervals. The externally threaded tube segment (122) and the spring clip (123) are both located at the end of the second tube (12) inserted into the first tube (11).

8. An electric heating assembly characterised in that, The device includes a base (2), an electric heating element (4), a temperature probe (3), and a temperature probe blind tube (1) as described in any one of claims 1-7. The temperature probe blind tube (1) and the electric heating element (4) are both fixed on the base (2). One closed end of the temperature probe blind tube (1) is located away from the base (2), and the temperature probe (3) is located inside the temperature probe blind tube (1) and close to the closed end of the temperature probe blind tube (1).

9. An electric heating assembly according to claim 8, characterised in that, The electric heating assembly also includes an electronic anode rod (5) and a nut (9). The base (2) has an insertion hole (21). One end of the electronic anode rod (5) is inserted into the insertion hole (21), and nuts (9) are threaded to both ends of the electronic anode rod (5) located in the insertion hole (21).

10. A water heater characterised by It includes a water tank and an electric heating assembly as described in any one of claims 7-9, wherein the electric heating tube (4) and the temperature probe blind tube (1) are inserted into the water tank.

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