Liquid heater

Abstract

The invention relates to the field of small household appliances, in particular to a liquid heater. The kettle comprises a kettle body, a stirring shaft and a stirring head are arranged on the kettle body, the kettle body is provided with an inner container, the stirring shaft upwards penetrates through the bottom of the kettle body and extends into the inner container, the stirring head is connected to the upper end of the stirring shaft, the stirring head is provided with vertically-through mounting holes, the mounting holes comprise the first mounting hole and the second mounting hole, and the first mounting hole is located above the second mounting hole. A connector is arranged at the upper end of the stirring shaft, an elastic ring is arranged on the peripheral wall of the connector, the connector penetrates into the mounting hole from bottom to top, and the elastic ring penetrates through the second mounting hole and then extends into the first mounting hole. According to the liquid heater, the mounting hole is a through hole, a connector of a stirring shaft can be observed through the mounting hole when the stirring head is mounted, one-time in-place mounting is facilitated, in addition, an elastic ring is arranged to be matched with the mounting hole with the size change, so that connection between the connector and the stirring head is stable, and the stirring head is prevented from being thrown off.

Description

Technical Field

[0001] The invention relates to the field of small household appliances, and in particular to a liquid heater. Background Art

[0002] Some liquid heaters are not only used to make tea and boil water, but also to cook porridge and soup, such as health kettles. However, when cooking rice porridge and other foods, health kettles have problems such as insufficient viscosity, sticky bottom and stratification. Adding a stirring component to the kettle body can improve this problem. This type of health kettle is usually composed of a kettle body and a stirring component. The stirring component generally includes a stirring shaft and a stirring head. The stirring shaft and stirring head are generally detachable structures for easy cleaning, but they must also be easy for users to disassemble and assemble, and the stirring head must not fall off when pouring ingredients.

[0003] In traditional technology, the mounting holes on the stirring head are all blind holes. For example, the Chinese patent authorization announcement number CN217161799U, entitled "A stirring assembly and liquid heating container", provides a stirring assembly, which includes: a stirring blade, a shaft hole opening downward is provided at the center bottom of the stirring blade, and a mounting groove is located below the shaft hole and connected to the shaft hole; a stirring shaft, the stirring shaft is inserted into the shaft hole; a sealing ring is sleeved on the stirring shaft, and the sealing ring is located in the mounting groove; a stopper is arranged below the mounting groove, and the stopper extends inward from the edge of the mounting groove to below the sealing ring to prevent the stirring blade from detaching from the stirring shaft.

[0004] For example, in the Chinese patent authorization announcement number CN216256675 U, the patent named "Stirring component and liquid heating container", a stirring component is provided, which includes: a stirring blade, a mounting groove with an opening downward is provided at the central bottom of the stirring blade, and an axial hole is provided on the bottom wall of the mounting groove; a sealing ring is arranged in the mounting groove; a stirring shaft, the stirring shaft passes through the sealing ring and is inserted into the axial hole, and the sealing ring is engaged and connected with the stirring shaft.

[0005] In the above patent, the stirring head and the stirring shaft are both installed through blind holes. The user cannot see the alignment of the mounting hole on the stirring head and the connecting head on the stirring shaft during disassembly and assembly. The assembly is difficult and the blind hole is difficult to clean. However, if the mounting hole on the stirring head is directly changed to a through hole, there is a problem that the stirring head is easy to fall off during operation. Summary of the invention

[0006] In view of the shortcomings of the existing liquid heater's stirring head being installed with a blind hole and a stirring shaft, which makes assembly difficult and cleaning difficult, the purpose of the present invention is to provide a liquid heater, in which the mounting hole is a through hole. When installing the stirring head, the connecting head of the stirring shaft can be observed through the mounting hole and then directly aligned, which facilitates one-time installation. In addition, an elastic ring is provided to cooperate with the mounting hole with variable size, so that the connection between the connecting head and the stirring head is firm, preventing the stirring head from falling off.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a liquid heater, comprising a kettle body, a stirring assembly being provided on the kettle body, the stirring assembly comprising a stirring shaft and a stirring head, the kettle body having an inner tank, the stirring shaft passing upward through the bottom of the kettle body and extending into the inner tank, the stirring head being connected to the upper end of the stirring shaft, the stirring head having a mounting hole passing through from top to bottom, the mounting hole comprising a first mounting hole and a second mounting hole, the first mounting hole being located above the second mounting hole, the projection of the second mounting hole on a horizontal plane being within the projection of the first mounting hole on a horizontal plane, the upper end of the stirring shaft having a connecting head, a circle of grooves being provided on the outer peripheral wall of the connecting head, an elastic ring being installed in the groove, the connecting head being inserted into the mounting hole from bottom to top, the elastic ring being squeezed through the second mounting hole and extending into the first mounting hole.

[0008] In the technical scheme, the detachable stirring assembly includes a stirring shaft, a stirring head and an elastic ring, which is convenient for the user to remove the stirring head for cleaning. The mounting hole of the stirring head is through from top to bottom. When cleaning, the stirring shaft is removed, and the user can clean the mounting hole of the stirring head by flushing it with water. There is no dead angle, which is convenient for cleaning the mounting hole. There is a circle of grooves on the outer peripheral wall of the connecting head for placing the elastic ring. The projection of the second mounting hole located below the stirring head is within the projection of the first mounting hole, that is, the size of the second mounting hole is smaller than the size of the first mounting hole. The elastic ring squeezes through the second mounting hole from bottom to top and then extends into the first mounting hole. The elastic ring is compressed at the second mounting hole and enters an expanded state at the first mounting hole. The user will feel an obvious loose feeling, reminding the user to stop exerting force. When pouring food, the elastic ring located in the first mounting hole is stuck on the upper end face of the second mounting hole, so that the stirring head is stuck on the stirring shaft, and the stirring head is fixed to the stirring shaft to prevent the stirring head from detaching from the stirring shaft when pouring food, thereby achieving the anti-detachment effect of the stirring head. The plug-in and pull-out force is provided by the interference fit between the elastic ring and the second mounting hole, the manufacturing and assembly requirements are low, and the mixing head is easy to pull out. When installing the mixing head, the user can directly observe the position of the connector and the elastic ring through the mounting holes that penetrate the mixing head from top to bottom, and then directly align them, and they can be inserted into place at one time without repeatedly rotating and installing them into place.

[0009] The present invention is further configured as follows: the outer contour of the elastic ring, the inner contour of the first mounting hole, and the inner contour of the second mounting hole are adapted to each other, and the size of the outer contour of the elastic ring is between the size of the inner contour of the first mounting hole and the size of the inner contour of the second mounting hole. Through this configuration, the outer contour of the elastic ring on the connector is adapted to the inner contour of the first mounting hole and the inner contour of the second mounting hole, so that when the connector is inserted into the mounting hole from bottom to top, the elastic ring can squeeze through the second mounting hole and extend into the first mounting hole. When not subject to external force, the size u of the outer contour of the elastic ring is greater than the size p of the inner contour of the second mounting hole, and is smaller than the size y of the inner contour of the first mounting hole, so that in the process of the elastic ring squeezing through the second mounting hole from bottom to top and extending into the first mounting hole, the elastic ring is compressed and deformed at the second mounting hole and shrinks, and enters a free state at the first mounting hole, and the user will feel an obvious loose feeling, reminding the user to stop exerting force. When pouring food, the elastic ring located in the first mounting hole is clamped on the upper end surface of the second mounting hole, thereby clamping the stirring head on the stirring shaft to prevent the stirring head from detaching from the stirring shaft when pouring food, thereby achieving an anti-detachment effect of the stirring head.

[0010] The present invention is further configured such that the upper end surface of the stirring shaft does not exceed the upper end surface of the stirring head. In order to prevent the stirring shaft from scratching the user when the stirring assembly is disassembled, the upper end surface of the stirring shaft should be lower than the upper end surface of the stirring head or flush with the upper end surface of the stirring head. Optimally, the upper end surface of the stirring shaft is slightly lower than the upper end surface of the stirring head, and the upper end surface of the stirring shaft and the upper end surface of the stirring head maintain a suitable height difference. If it is too large, the longitudinal dimension of the stirring head will be too large, and if it is too small, the user will accidentally touch the stirring shaft.

[0011] The present invention is further configured as follows: the mounting hole also includes a third mounting hole, the third mounting hole is located below the second mounting hole, and the stirring shaft located below the connecting head is inserted into the third mounting hole. The mounting holes on the stirring head are respectively the first mounting hole, the second mounting hole and the third mounting hole from top to bottom, and the circular third mounting hole extends to the lower end surface of the stirring head, and cooperates with the outer diameter below the connecting head of the stirring shaft to prevent the stirring shaft from being deflected by force in the horizontal direction, and the structure is stable. At the same time, during the assembly process, the elastic ring is squeezed and deformed with the third mounting hole and the second mounting hole respectively, and the anti-slip effect is better.

[0012] The present invention is further configured as follows: the elastic ring and the second mounting hole both have a long side and a short side structure, wherein the two long sides are arranged opposite to each other, the ends of the long sides are connected by an arc-shaped short side, the long side of the elastic ring and the long side of the second mounting hole are interference fit, the short side of the second mounting hole and the circumference of the third mounting hole have a smooth transition, and the short side of the elastic ring and the circumference of the third mounting hole are interference fit. The stirring shaft is cylindrical as a whole, and the connector is non-circular, preferably in the shape of a flat runway circle, that is, it has a long side and a short side structure, which is convenient for connecting to the stirring head to transmit torque. When installing the stirring head, the user can directly observe the position of the long side and the short side of the connector through the mounting hole that passes through the stirring head from top to bottom, and then directly align it, and it can be inserted into place at one time without repeated rotation to install it in place. The short side of the elastic ring is interference fit with the circumference of the third mounting hole, and the long side of the elastic ring is interference fit with the long side of the second mounting hole. During the assembly process, the elastic ring is squeezed and deformed with the third mounting hole and the second mounting hole respectively. The elastic ring is subjected to different resistances at different positions, and the hand feeling fed back to the user is also different. The position of the elastic ring can be known through the change of hand feeling, and thus the position of the stirring head relative to the stirring shaft can be known. The short side of the second mounting hole and the circumference of the third mounting hole have a smooth transition, which facilitates the elastic ring to enter the second mounting hole from the third mounting hole.

[0013] The present invention is further configured as follows: the interference between the long side of the elastic ring and the long side of the second mounting hole is c, the height of the second mounting hole is d, the interference between the short side of the elastic ring and the circumference of the third mounting hole is e, the height of the third mounting hole is f, c>e, f>d. The interference between the long side of the elastic ring and the long side of the second mounting hole is c, c=(up) / 2, that is, c is the distance between the long side of the elastic ring and the long side of the second mounting hole, the height of the second mounting hole is d, and the first layer of anti-slip is performed by relying on the interference of c in the length of d; the interference between the short side of the elastic ring and the circumference of the third mounting hole is e, the height of the third mounting hole is f, and the second layer of anti-slip is performed by relying on the interference of f in the length of e, which is used to protect when the first layer of anti-slip fails, and at the same time, it can ensure that the elastic ring has a certain resistance during the entire insertion process of the mounting hole, and the friction of the two layers of anti-slip makes it difficult for the stirring head to fall when pouring the food in the pot body. c>e, that is, the interference between the long side of the elastic ring and the long side of the second mounting hole is greater than the interference between the short side of the elastic ring and the circumference of the third mounting hole. During the assembly process, the elastic ring is squeezed and deformed with the third mounting hole and the second mounting hole respectively. The elastic ring is subjected to different resistances at different positions, and the hand feeling fed back to the user is also different. The position of the elastic ring can be known by the change of hand feeling, and thus the position of the stirring head relative to the stirring shaft can be known. f>d, the height of the third mounting hole is greater than the height of the second mounting hole. The height of the third mounting hole is the positioning length of the stirring shaft and the stirring head. A large positioning length of the stirring shaft and the stirring head is conducive to the stability of the connection structure between the stirring shaft and the stirring head.

[0014] The present invention is further configured such that: a lower step surface is formed at the junction of the lower end of the connector and the stirring shaft, and an upper step surface is formed at the junction of the second mounting hole and the third mounting hole, and the lower step surface abuts against the upper step surface. When the stirring head and the stirring shaft are assembled, the stirring shaft is inserted into the mounting hole of the stirring head from bottom to top until the lower step surface on the stirring shaft abuts against the upper step surface on the stirring head and is placed in place. When the user continues to press the stirring head hard, the stirring paddle will not move downward relative to the stirring shaft, thereby supporting and limiting the stirring head, and the structure is stable.

[0015] The present invention is further configured as follows: the distance between the lower end face of the elastic ring and the upper end face of the second mounting hole is 0.5 mm to 2 mm. Through this configuration, when the stirring head is installed on the stirring shaft, the distance j from the root of the elastic ring on the stirring shaft to the upper end face of the second mounting hole is between 0.5 mm and 2 mm. Through this configuration, on the one hand, when the distance is too small, due to production tolerances, when the stirring head is installed in place on the stirring shaft, the elastic ring may not be out of the second mounting hole, resulting in unstable elastic ring engagement and limiting, that is, the elastic ring does not extend into the first mounting hole, the elastic ring is not stuck on the upper end face of the second mounting hole, the stirring head is not fixed to the stirring shaft, and the anti-slip effect of the stirring head cannot be achieved; on the other hand, when the distance is too large, the elastic ring will slide up and down in the second mounting hole during operation, the elastic ring is set on the stirring shaft, and the second mounting hole is set on the stirring head, thereby causing the stirring head to shake up and down on the stirring shaft.

[0016] The present invention is further configured as follows: the elastic ring and the groove have a matching clearance in the vertical direction, and the matching clearance is between 0.15 mm and 0.3 mm. Through this configuration, the inner hole surface of the elastic ring is matched with the groove, and the matching clearance i between the elastic ring and the groove in the vertical direction is between 0.15 mm and 0.3 mm, which provides space for the elastic ring to be squeezed and deformed. On the one hand, if the matching clearance is too small, the size of the elastic ring in the vertical direction is too large due to the production tolerance, and the elastic ring may not be completely installed in the groove; on the other hand, if the matching clearance is too large, the elastic ring will slide up and down in the groove, and the elastic ring may not be fixed in the groove.

[0017] The present invention is further configured as follows: the stirring head has at least two different cross-sections in the up-down direction, wherein the cross-section at the upper part is larger than the cross-section at the lower part. Through this configuration, the two cross-sections of the stirring head in the up-down direction are different, and the cross-section at the upper part of the stirring head is larger than the cross-section at the lower part. When the stirring head needs to be removed from the stirring shaft, it is convenient for the user to apply force when pulling it out, which makes it easy to pull out the stirring head. Optimally, the stirring head as a whole is an inverted trapezoidal structure with a larger upper part and a smaller lower part. When the stirring head needs to be removed from the stirring shaft, the user can pinch the middle and lower part of the stirring head with his fingers, apply force upward, and it can be easily pulled out.

[0018] The advantages of the present invention are: (1) The mounting hole on the stirring head is through-hole, and when cleaning, the stirring shaft is removed, and the user can clean the mounting hole of the stirring head by flushing it with water, without dead angles, and it is easy to clean the mounting hole. The elastic ring squeezes through the second mounting hole from bottom to top and then extends into the first mounting hole. The elastic ring is compressed at the second mounting hole and enters a free state at the first mounting hole. The user will feel an obvious looseness, reminding the user to stop exerting force; (2) When pouring food, the elastic ring located in the first mounting hole is stuck on the upper end surface of the second mounting hole, thereby clamping the stirring head on the stirring shaft, fixing the stirring head and the stirring shaft, and preventing When pouring food, the stirring head is separated from the stirring shaft, thereby preventing the stirring head from falling off. The plug-in and pull-out force is provided by the interference fit between the elastic ring and the upper end face of the second mounting hole. The manufacturing and assembly requirements are low, and the stirring head is easy to pull out. When installing the stirring head, the user can directly observe the position of the connecting head and the elastic ring through the upper and lower mounting holes of the stirring head, and then directly align them. The stirring head can be inserted into place at one time without repeatedly rotating and installing it into place. (3) The stirring head is an inverted trapezoidal structure with a larger top and a smaller bottom. When the stirring head needs to be removed from the stirring shaft, the user can pinch the middle and lower part of the stirring head with his fingers and apply force upward to easily pull it out. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a liquid heater in one embodiment of the present invention; Figure 2 A split diagram of a stirring assembly in one embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the stirring head and the stirring shaft in one embodiment of the present invention; Figure 4 It is a structural schematic diagram of a mounting hole in one embodiment of the present invention; Figure 5 It is a schematic diagram of the structure of an elastic ring in one embodiment of the present invention; Figure 6 A cross-sectional view of a stirring assembly at one angle in one embodiment of the present invention; Figure 7 for Figure 6 The enlarged view of point A in the middle; Figure 8 A cross-sectional view of a stirring assembly at another angle in one embodiment of the present invention; Fig. 9 for Figure 8 The enlarged view of point B in the middle; Fig.10 A cross-sectional view of one angle of cooperation between a stirring head and a stirring shaft in one embodiment of the present invention; Fig.11 This is a cross-sectional view of another angle of the cooperation between the stirring head and the stirring shaft in one embodiment of the present invention.

[0020] Figure numerals: kettle body 100, inner pot 110, stirring assembly 200, stirring shaft 210, connecting head 211, groove 212, elastic ring 213, lower step surface 214, first end surface 215, stirring head 220, second end surface 221, mounting hole 230, first mounting hole 231, second mounting hole 232, third mounting hole 233, upper step surface 234, long side 300, short side 400, heating plate 500. DETAILED DESCRIPTION

[0021] In the description of this embodiment, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "back", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore, cannot be understood as limiting the present invention. In addition, if the terms "first", "second", and "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] Reference Figures 1 to 11 In one embodiment of the present invention, the liquid heater comprises a kettle body 100 and a base. The kettle body is provided with a stirring assembly 200. The stirring assembly 200 comprises a stirring shaft 210 and a stirring head 220. The kettle body 100 has an inner liner 110 and a bottom cover. The bottom cover is arranged at the lower end of the inner liner. The stirring shaft 210 passes upward through the bottom of the kettle body 100 and extends into the inner liner 110. The stirring head 220 is connected to the upper end of the stirring shaft 210. In order to realize the rotation of the stirring shaft 210, a motor is further arranged on the liquid heater. The motor shaft is connected to the stirring shaft in a transmission manner. The motor can be placed on the upper side and arranged in the bottom cover. The motor shaft is directly connected to the stirring shaft. The motor can also be placed on the lower side and arranged in the base. When the kettle body is placed on the base, the motor shaft is directly connected to the stirring shaft in a transmission manner.

[0024] In order to solve the problems of high difficulty in assembly and cleaning between the stirring head 220 and the stirring shaft 210, as well as the problem that the stirring head 220 is easily thrown off during operation, in one embodiment of the present invention, the stirring head 220 has a mounting hole 230 that passes through from top to bottom, and the mounting hole 230 includes a first mounting hole 231 and a second mounting hole 232. The first mounting hole 231 is located above the second mounting hole 232, and the projection of the second mounting hole 232 on the horizontal plane is within the projection of the first mounting hole 231 on the horizontal plane. The upper end of the stirring shaft 210 has a connecting head 211, and a circle of grooves 212 are provided on the outer peripheral wall of the connecting head 211. An elastic ring 213 is installed in the groove 212. The connecting head 211 penetrates into the mounting hole 230 from bottom to top, and the elastic ring 213 squeezes through the second mounting hole 232 and extends into the first mounting hole 231.

[0025] In this embodiment, the detachable stirring assembly 220 includes a stirring shaft 210, a stirring head 220 and an elastic ring 213, so that the user can remove the stirring head 220 for cleaning. The mounting hole 230 of the stirring head 220 is through-through, and when cleaning, the stirring shaft 210 is removed, and the user can clean the stirring head 220 by flushing it with water, without dead angles, and the mounting hole 230 is easy to clean. There is a circle of groove 212 on the outer peripheral wall of the connecting head 211, which is used to place the elastic ring 213. The projection of the second mounting hole 232 located at the bottom of the stirring head 220 is within the projection of the first mounting hole 231, that is, the size of the second mounting hole 232 is smaller than the size of the first mounting hole 231. The first mounting hole 231 extends to the upper end surface of the stirring head 220. The elastic ring 213 squeezes through the second mounting hole 232 from bottom to top and then extends into the first mounting hole 231. The elastic ring 213 is compressed at the second mounting hole 232 and enters a free state at the first mounting hole 231. The user will feel an obvious looseness, reminding the user to stop exerting force. When pouring food, the elastic ring 213 located in the first mounting hole 231 is stuck on the upper end surface of the second mounting hole 232, so that the stirring head 220 is stuck on the stirring shaft 210, and the stirring head 220 is fixed to the stirring shaft 210 to prevent the stirring head 220 from being separated from the stirring shaft 210 when pouring food, thereby achieving the anti-detachment effect of the stirring head 220. The plug-in and pull-out force is provided by the interference fit between the elastic ring 213 and the upper end surface of the second mounting hole 232, the manufacturing and assembly requirements are low, and the stirring head 220 is easy to pull out. When installing the stirring head 220, the user can directly observe the position of the connecting head 211 and the elastic ring 213 through the mounting hole 230 that passes through the stirring head 220 from top to bottom, and then directly align it, and it can be inserted into place at one time without repeatedly rotating and installing it in place.

[0026] In one embodiment of the present invention, reference Figure 1The stirring shaft 210 is perforated through the heating plate 500, and the elastic ring 213 is sleeved on the stirring shaft 210. After being assembled with the stirring head 220, the stirring shaft 210 and the head of the stirring shaft 210 are exposed to the stirring head 220 and exposed to water. However, in order to prevent the stirring shaft 210 from scratching the user when the stirring assembly 200 is disassembled, the upper end surface of the stirring shaft 210 should be lower than the upper end surface of the stirring head 220 or flush with the upper end surface of the stirring head 220. Preferably, refer to Figure 7 , Fig. 9 The upper end face of the stirring shaft 210 is the first end face 215, and the upper end face of the stirring head 220 is the second end face 221. The first end face 215 is slightly lower than the second end face 221. The first end face 215 and the second end face 221 maintain an appropriate height difference. If it is too large, the longitudinal dimension of the stirring head 220 will be too large, and if it is too small, the user will accidentally touch the stirring shaft 210.

[0027] In one embodiment of the present invention, referring to Figure 3 , Figure 4 , Figure 5 and Figure 7 In order to facilitate the user to disassemble and assemble the stirring head 220, the outer contour of the elastic ring 213, the inner contour of the first mounting hole 231, and the inner contour of the second mounting hole 232 are matched, and the size u of the outer contour of the elastic ring 213 is between the size y of the inner contour of the first mounting hole 231 and the size p of the inner contour of the second mounting hole 232. The outer contour of the elastic ring 213 on the connecting head 211 is matched with the inner contours of the first mounting hole 231 and the second mounting hole 232, so that when the connecting head 211 is inserted into the mounting hole 230 from bottom to top, the elastic ring 213 can squeeze through the second mounting hole 232 and extend into the first mounting hole 231. When not subject to external force, the dimension u of the outer contour of the elastic ring 213 is greater than the dimension p of the inner contour of the second mounting hole 232, and smaller than the dimension y of the inner contour of the first mounting hole 231, so that when the elastic ring 213 squeezes through the second mounting hole 232 from bottom to top and extends into the first mounting hole 231, the elastic ring 213 is compressed and deformed at the second mounting hole 232 and shrinks, and enters a free state at the first mounting hole 231. The user will feel an obvious looseness, reminding the user to stop exerting force. When pouring food, the elastic ring 213 located in the first mounting hole 231 is stuck on the upper end surface of the second mounting hole 232, thereby clamping the stirring head 220 on the stirring shaft 210, preventing the stirring head 220 from detaching from the stirring shaft 210 when pouring food, and achieving the anti-detachment effect of the stirring head 220.

[0028] It can be understood that the elastic ring 213 is in the shape of a racetrack ring as a whole, the inner hole surface of the elastic ring 213 is contoured to the groove 212, and the outer wall surface is larger than the short side of the stirring shaft 210 (viewed from above), preventing fingers from scratching the edge of the groove 212 of the stirring shaft 210.

[0029] In one embodiment of the present invention, reference Figure 6 , Figure 7 In order to achieve the anti-dropping effect of the stirring head 220 and prevent the stirring head 220 from shaking up and down on the stirring shaft 210, the distance between the lower end surface of the elastic ring 213 and the upper end surface of the second mounting hole 232 is 0.5mm to 2mm. When the stirring head 220 is installed on the stirring shaft 210, the distance j from the root of the elastic ring 213 on the stirring shaft 210 to the upper end surface of the second mounting hole 232 is between 0.5mm and 2mm. On the one hand, if the distance is too small, due to production tolerances, when the stirring head 220 is installed in place on the stirring shaft 210, the elastic ring 213 may not be out of the second mounting hole 232, resulting in unstable engagement of the elastic ring 213, that is, the elastic ring 213 has not extended into the first mounting hole 231, the elastic ring 213 has not been stuck on the upper end surface of the second mounting hole 232, the stirring head 220 is not fixed to the stirring shaft 210, and the anti-detachment effect of the stirring head 220 cannot be achieved; on the other hand, if the distance is too large, the elastic ring 213 will slide up and down in the second mounting hole 232 during operation. The elastic ring 213 is set on the stirring shaft 210, and the second mounting hole 232 is set on the stirring head 220, which causes the stirring head 220 to shake up and down on the stirring shaft 210.

[0030] In one embodiment of the present invention, reference Figure 8 , Fig. 9 In order to provide space for the elastic ring to be squeezed and deformed, the elastic ring 213 and the groove 212 have a matching clearance in the vertical direction, and the matching clearance is between 0.15mm and 0.3mm. The inner hole surface of the elastic ring 213 is contoured with the groove 212, and the matching clearance i between the elastic ring 213 and the groove 212 in the vertical direction is between 0.15mm and 0.3mm, which provides space for the elastic ring 213 to be squeezed and deformed. On the one hand, if the matching clearance is too small, the size of the elastic ring 213 in the vertical direction is too large due to production tolerance, and the elastic ring 213 may not be completely installed in the groove 212; on the other hand, if the matching clearance is too large, the elastic ring 213 will slide up and down in the groove 212, and the elastic ring 213 may not be fixed in the groove 212.

[0031] In one embodiment of the present invention, reference Figure 7 , Fig. 9 , Fig.10 and Fig.11 In order to facilitate the user to disassemble and assemble the stirring head 220, the stirring head 220 has at least two different cross-sections in the upper and lower directions, wherein the cross-section at the upper part is larger than the cross-section at the lower part. The two cross-sections of the stirring head 220 in the upper and lower directions are different, and the cross-section at the upper part of the stirring head 220 is larger than the cross-section at the lower part. When the stirring head 220 needs to be removed from the stirring shaft 210, there is a place for the user to apply force when pulling it out, which makes it easy to pull out the stirring head 220.

[0032] Furthermore, the stirring head 220 is a conical structure with a larger top and a smaller bottom. The stirring head 220 is an inverted trapezoidal structure with a larger top and a smaller bottom. When the stirring head 220 needs to be removed from the stirring shaft 210, the user can pinch the middle and lower part of the stirring head 220 with fingers and apply force upward to easily remove it.

[0033] In one embodiment of the present invention, reference Figures 6 to 11 In order to prevent the stirring shaft 210 from being deflected by force in the horizontal direction, the mounting hole 230 also includes a third mounting hole 233. The third mounting hole 233 is located below the second mounting hole 232 and extends to the lower end surface of the stirring head 220. The stirring shaft 210 located below the connecting head 211 is inserted into the third mounting hole 233. The mounting holes 230 on the stirring head 220 are respectively the first mounting hole 231, the second mounting hole 232 and the third mounting hole 233 from top to bottom. The circular third mounting hole 233 extends to the lower end surface of the stirring head 220 and cooperates with the outer diameter of the stirring shaft 210 below the connecting head 211 to prevent the stirring shaft 210 from being deflected by force in the horizontal direction. The structure is stable. At the same time, during the assembly process, the elastic ring 213 is squeezed and deformed with the third mounting hole 233 and the second mounting hole 232 respectively.

[0034] In one embodiment of the present invention, reference Figure 3 , Fig.11 , Fig.10 In order to prevent the stirring shaft 210 from being deflected by the force in the horizontal direction, a lower step surface 214 is formed at the junction of the lower end of the connector 211 and the stirring shaft 210, and an upper step surface 234 is formed at the junction of the second mounting hole 232 and the third mounting hole 233, and the lower step surface 214 abuts against the upper step surface 234. When the stirring head 220 and the stirring shaft 210 are assembled, the stirring shaft 210 penetrates the mounting hole 230 of the stirring head 220 from bottom to top until the lower step surface 214 on the stirring shaft 210 abuts against the upper step surface 234 on the stirring head 220 and is placed in place. The user continues to press the stirring head 220 hard, and the stirring paddle will not move downward relative to the stirring shaft 210, which plays a role in supporting and limiting the stirring head 220, and the structure is stable.

[0035] In one embodiment of the present invention, reference Figure 3 , Fig.11 , Fig.10In order to prevent the user from feeling a noticeable looseness when the stirring head and the stirring shaft are assembled in place, the elastic ring 213 and the second mounting hole 232 both have a long side 300 and a short side 400 structure, wherein the two long sides 300 are arranged opposite to each other, and the ends of the long sides 300 are connected by an arc-shaped short side 400, and the long side 300 of the elastic ring 213 and the long side 300 of the second mounting hole 232 are interference fit, and the short side 400 of the second mounting hole 232 and the circumference of the third mounting hole 233 are smoothly transitioned, and the short side 400 of the elastic ring 213 and the circumference of the third mounting hole 233 are interference fit. The stirring shaft 210 is cylindrical as a whole, and the connector 211 is non-circular, preferably in a flat runway circular shape, that is, it has a long side 300 and a short side 400 structure, which is convenient for connecting with the stirring head 220 to transmit torque. When installing the stirring head 220, the user can directly observe the position of the long side and short side of the connecting head 211 through the mounting hole 230 that passes through the stirring head 220, and then directly align it, so that it can be inserted into place at one time without repeatedly rotating and installing it into place. The short side 400 of the elastic ring 213 and the circumference of the third mounting hole 233 are interference fit, and the long side 300 of the elastic ring 213 and the long side 300 of the second mounting hole 232 are interference fit. During the assembly process, the elastic ring 213 is squeezed and deformed with the third mounting hole 233 and the second mounting hole 232 respectively. The elastic ring 213 is in different positions and the resistance it encounters is different, and the hand feeling fed back to the user is also different. The position of the elastic ring 213 can be known by the change of the hand feeling, so as to know the position of the stirring head 220 relative to the stirring shaft 210. The short side 400 of the second mounting hole 232 and the circumference of the third mounting hole 233 have a smooth transition, which facilitates the elastic ring 213 to enter the second mounting hole 232 from the third mounting hole 233.

[0036] In one embodiment of the present invention, reference Figure 7 , Fig. 9The interference between the long side 300 of the elastic ring 213 and the long side 300 of the second mounting hole 232 is c, the height of the second mounting hole 232 is d, the interference between the short side 400 of the elastic ring 213 and the circumference of the third mounting hole 233 is e, and the height of the third mounting hole 233 is f, c>e, f>d. The interference between the long side 300 of the elastic ring 213 and the long side 300 of the second mounting hole 232 is c, c=(up) / 2, that is, c is the distance between the long side 300 of the elastic ring 213 and the long side 300 of the second mounting hole 232, the height of the second mounting hole 232 is d, and the first layer of anti-slipping is performed by relying on the interference of c in the length of d; the interference between the short side 400 of the elastic ring 213 and the circumference of the third mounting hole 233 is e, the height of the third mounting hole 233 is f, and the second layer of anti-slipping is performed by relying on the interference of f in the length of e, which is used to protect when the first layer of anti-slipping fails, and at the same time, it can ensure that the elastic ring 213 has a certain resistance during the entire insertion process of the mounting hole 230. The friction of the two layers of anti-slipping makes it difficult for the stirring head 220 to fall off when pouring food in the pot body. c>e, e>0.1mm, 1mm>c>0.3mm, that is, the interference between the long side 300 of the elastic ring 213 and the long side 300 of the second mounting hole 232 is greater than the interference between the short side 400 of the elastic ring 213 and the circumference of the third mounting hole 233. During the assembly process, the elastic ring 213 is squeezed and deformed with the third mounting hole 233 and the second mounting hole 232 respectively. The elastic ring 213 is subjected to different resistances at different positions, and the hand feeling fed back to the user is also different. The position of the elastic ring 213 can be known by the change of the hand feeling, so as to know the position of the stirring head 220 relative to the stirring shaft 210. f>d, f>10mm, the height of the third mounting hole 233 is greater than the height of the second mounting hole 232, and the height of the third mounting hole 233 is the positioning length of the stirring shaft 210 and the stirring head 220. The large positioning length of the stirring shaft 210 and the stirring head 220 is conducive to the stability of the connection structure between the stirring shaft 210 and the stirring head 220. When pulling out, there is first an interference between c+e and distance d, so a stronger pulling force is needed, and then there is an interference between e and f, so a smaller force is needed to pull it out. And because the distance f over which the friction acts is very long, the stirring component will not fall off when pouring the food in the pot, and the dimensional tolerance requirement for the interference amount is relatively low.

[0037] It can be understood that the stirring head 220 is connected to a stirring blade, which is a metal part and can be formed by any molding method such as sheet metal welding (stainless steel), aluminum die casting or stainless steel 3D printing.

[0038] The specific description of the present invention in the above embodiments is only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Technical engineers in this field may make some non-essential improvements and adjustments to the present invention based on the contents of the above invention, which fall within the scope of protection of the present invention.

Claims

1. A liquid heater, comprising a kettle body, a stirring assembly being provided on the kettle body, the stirring assembly comprising a stirring shaft and a stirring head, the kettle body having an inner liner, the stirring shaft passing upward through the bottom of the kettle body and extending into the inner liner, the stirring head being connected to the upper end of the stirring shaft, characterized in that: The stirring head has a mounting hole that passes through from top to bottom, and the mounting holes include a first mounting hole and a second mounting hole. The first mounting hole is located above the second mounting hole, and the projection of the second mounting hole on the horizontal plane is within the projection of the first mounting hole on the horizontal plane. The upper end of the stirring shaft has a connecting head, and a circle of grooves is provided on the outer peripheral wall of the connecting head. An elastic ring is installed in the groove. The connecting head is inserted into the mounting hole from bottom to top, and the elastic ring squeezes through the second mounting hole and then extends into the first mounting hole.

2. A liquid heater according to claim 1, characterized in that: The outer contour of the elastic ring, the inner contour of the first mounting hole, and the inner contour of the second mounting hole are matched in shape, and the size of the outer contour of the elastic ring is between the size of the inner contour of the first mounting hole and the size of the inner contour of the second mounting hole.

3. A liquid heater according to claim 1, characterized in that: The upper end surface of the stirring shaft does not exceed the upper end surface of the stirring head.

4. A liquid heater according to claim 1, 2 or 3, characterized in that: The mounting holes also include a third mounting hole, which is located below the second mounting hole, and the stirring shaft located below the connecting head is inserted into the third mounting hole.

5. A liquid heater according to claim 4, characterized in that: The elastic ring and the second mounting hole both have a long side and a short side structure, wherein the two long sides are arranged opposite to each other, the ends of the long sides are connected by arc-shaped short sides, the long side of the elastic ring and the long side of the second mounting hole are interference fit, the short side of the second mounting hole and the circumference of the third mounting hole have a smooth transition, and the short side of the elastic ring and the circumference of the third mounting hole are interference fit.

6. A liquid heater according to claim 5, characterized in that: The interference between the long side of the elastic ring and the long side of the second mounting hole is c, the height of the second mounting hole is d, the interference between the short side of the elastic ring and the circumference of the third mounting hole is e, the height of the third mounting hole is f, c>e, f>d.

7. A liquid heater according to claim 4, characterized in that: A lower step surface is formed at the junction between the lower end of the connector and the stirring shaft, and an upper step surface is formed at the junction between the second mounting hole and the third mounting hole, and the lower step surface is against the upper step surface.

8. A liquid heater according to claim 1, 2 or 3, characterized in that: The distance between the lower end surface of the elastic ring and the upper end surface of the second mounting hole is 0.5 mm to 2 mm.

9. A liquid heater according to claim 1, 2 or 3, characterized in that: The elastic ring and the groove have a matching clearance in the up-down direction, and the matching clearance is between 0.15 mm and 0.3 mm.

10. A liquid heater according to claim 1, 2 or 3, characterized in that: The stirring head has at least two different cross sections in the upper and lower directions, wherein the cross section at the upper part is larger than the cross section at the lower part, or the stirring head is in a conical structure with a larger upper part and a smaller lower part.

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