Thick film heating body of spiral runner

Abstract

A thick film heating body of a spiral flow channel comprises a shell, a lower end cover, a sealing ring, a central pipe, a spiral spring, a plug, a thick film heating pipe and an upper end cover, the spiral spring and the thick film heating pipe surround the central pipe, and the outer surface of the central pipe, the spiral spring and the inner wall of the thick film heating pipe form the spiral flow channel; an upper end cover and a lower end cover are assembled on the upper portion and the lower portion of the shell to be packaged into a whole, a plug is assembled between the upper end cover and the center pipe, and a limiting structure for limiting the relative rotation freedom degree between the plug and the upper end cover is arranged between the plug and the upper end cover. According to the thick film heating body, the arrangement structure of the internal spiral flow channel is improved, and the elastic reset piece is fixed and limited, so that the elastic reset piece cannot rotate along with water flow and is determined relative to the internal central pipe, and a flow guide path is stable, so that a temperature measurement element can be accurately positioned, the stability of the temperature measurement process is guaranteed, and the temperature detected by NTC is prevented from deviating from the actual condition; therefore, the problems that safe power failure lacks guarantee or the outlet water temperature is not stable enough are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric heating in drinking water and water supply equipment, in particular to the thick film heating control technology for rapid heating and precise control of drinking water equipment.

Background Art

[0002] The structure of the so-called thick film heating element mainly includes a stainless steel layer, an inner insulating dielectric layer, a resistive heating layer, and an outer insulating dielectric layer from the inside to the outside. The heat conduction distance from the resistive heating layer to the stainless steel layer is short and the thermal resistance is small. Therefore, the thick film heating element has the advantages of small thermal resistance and fast thermal response speed due to its structural characteristics.

[0003] In the application of the thick film heating element, it is often necessary to monitor and control the temperature of the heating element in real time. Generally, the existing technical means are to set a temperature-sensitive material that fits the surface of the heating element outside the heating element, and cooperate with a protection switch and a circuit board to control the temperature of the heating element. Once the safe temperature range is exceeded, it will be disconnected to cut off the working state for regulation.

[0004] Chinese Utility Model Patent CN 220896860 U discloses a thick film heater, which includes a tube body and a thick film heating element that wraps the tube body. A pressure relief device is provided at one end of the tube body and the thick film heating element. The pressure relief device includes a water inlet end cap, a front end cap, and an elastic reset member. The front end cap is sealed at one end of the tube body, the water inlet end cap is sealed at one end of the thick film heating element, and the elastic reset member is installed between the front end cap and the water inlet end cap. When the tube body is pressurized, the tube body can deform the elastic reset member and press it against the water inlet end cap to release the high-pressure gas in the tube body, and the tube body returns to its initial state under the action of the elastic reset member.

[0005] The above-mentioned disclosed patent solves the problem of pressure relief of the heat-conducting inner tube during the heating process of the thick film heating element. The air in the inner tube of the heating conduit expands when heated, resulting in a relatively large pressure in the heat-conducting inner tube. If the pressure cannot be relieved in time, the heat-conducting inner tube will expand, which may cause a safety hazard of explosion of the heat-conducting inner tube. However, during use, since the position of the elastic reset member outside the tube body is not fixed and will rotate with the impact of water flow, and at the same time, if the heating element is used in a scale-forming occasion, after the heating element structure, the temperature cannot be detected, and steam will appear particularly frequently, resulting in inaccurate detection of the inlet and outlet water temperatures by the NTC and inability to ensure the outlet water temperature.

Summary of the Invention

[0006] In view of the problems existing in the prior art, the present utility model provides an improved internal spiral flow channel setting structure to fix and limit the elastic reset member, so that it cannot rotate with the water flow. The relative position of the internal central tube is determined, and the diversion route is stable. In this way, the temperature measuring element can be accurately positioned, the stability of the temperature measuring process can be guaranteed, and the deviation between the temperature detected by the NTC and the actual situation can be avoided, thereby overcoming the problems such as lack of guarantee for safe power-off or unstable outlet water temperature.

[0007] The thick film heating body of the spiral flow channel related to the present utility model includes a housing, a lower end cover, a sealing ring, a central tube, a spiral spring, a plug, a thick film heating tube and an upper end cover. It is characterized in that the spiral spring is wound around the central tube, and the thick film heating tube is sleeved outside the central tube and the spiral spring. The outer surface of the central tube, the spiral spring and the inner wall of the thick film heating tube form a spiral flow channel; and the thick film heating tube is provided with a housing outside, and the upper end cover and the lower end cover are assembled up and down and sealed as a whole. Among them, a plug is assembled between the upper end cover and the central tube, and a limiting structure for limiting the relative rotational freedom between the plug and the upper end cover is provided between the plug and the upper end cover.

[0008] The limiting structure includes a positioning groove and a positioning protrusion that match each other, and there are two or more pairs of the paired positioning grooves and positioning protrusions.

[0009] Three positioning grooves are provided on the end face of the plug facing the upper end cover.

[0010] The three positioning grooves are asymmetrically distributed in the circumferential direction.

[0011] The plug includes an insertion end and a positioning end that are integrally formed. The outer diameter of the insertion end is in interference fit with the inner diameter of the central tube, and the insertion end is inserted into the central tube for assembly; the positioning end faces the upper end cover, and a positioning groove is provided on the end face facing the upper end cover.

[0012] The plug is arranged between the sealing ring of the upper end cover and the central tube, has a water outlet for conducting between the upper end cover and the spiral flow channel, and is provided with a spring positioning structure. One end of the spring is clamped into the spring positioning structure to limit the freedom of the spring.

[0013] The water outlet on the plug is opened on the circumferential surface of the plug, and the spring positioning structure is arranged beside the water outlet, satisfying that the spring coiling direction of the spring positioning structure outside the clamping end is on the side away from the water outlet.

Description of the Drawings

[0014] Figure 1 It is a schematic exploded view of a thick film heating body of a spiral flow channel related to the present utility model;

[0015] Figure 2It is a mating diagram of a plug and an upper end cover of a thick-film heater with a spiral flow channel involved in the present utility model;

[0016] Figure 3 It is a schematic structural diagram of a plug of a thick-film heater with a spiral flow channel involved in the present utility model;

[0017] Figure 4 It is a partial enlarged perspective view of a thick-film heater with a spiral flow channel involved in the present utility model;

[0018] Wherein: 10, housing; 20, lower end cover; 30, sealing ring; 40, central tube; 50, spiral spring; 60, plug; 61, water outlet; 62, spring positioning structure; 63, insertion end; 64, positioning end; 65, limiting structure; 70, thick-film heating tube; 71, water outlet thermometer; 72, film temperature thermometer; 73, heating film; 80, upper end cover; 81, positioning bump;

Specific Embodiment

[0019] The present utility model will be described in detail below in conjunction with the drawings and embodiments. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0020] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0021] Please refer to the attached Figure 1 and the attached Figure 2, which shows that the thick-film heating element with a spiral flow channel involved in the present utility model includes a housing 10, a lower end cover 20, a sealing ring 30, a central tube 40, a spiral spring 50, a plug 60, a thick-film heating tube 70, and an upper end cover 80. Among them, the spring flow channel 50 is wound around the central tube 40, and the thick-film heating tube 70 is sleeved outside the central tube 40 and the spiral spring 50. The outer surface of the central tube 40, the spiral spring 70, and the inner wall of the thick-film heating tube 70 form a spiral flow channel; and the thick-film heating tube 70 is provided with a housing 10 outside, and the upper end cover 80 and the lower end cover 20 are assembled up and down on the housing 10 and encapsulated as a whole. Among them, a plug 60 is assembled between the upper end cover 80 and the central tube 40, and there is a limiting structure 65 between the plug 60 and the upper end cover 80 to limit the relative rotational freedom between the two.

[0022] The limiting structure 65 includes a positioning groove 651 and a positioning protrusion 81 that match each other. There are two or more pairs of the paired positioning grooves 651 and positioning protrusions 81. Refer to the attached Figure 2 and the attached Figure 3 , which shows the positioning groove 651 and the positioning protrusion 81 that are mutually positioned and inserted.

[0023] In a specific implementation, three positioning grooves 651 can be provided on the end face of the plug 60 facing the upper end cover 80. And these three positioning grooves 651 are asymmetrically distributed in the circumferential direction.

[0024] The plug 60 includes an insertion end 63 and a positioning end 64 that are integrally formed. Among them, the outer diameter of the insertion end 63 and the inner diameter of the central tube 40 are in interference fit, and the insertion end 63 is inserted into the interior of the central tube 40 for assembly; the positioning end 64 faces the upper end cover 80, and there is a positioning groove on the end face facing the upper end cover 80.

[0025] First, the plug 60 is needed to position the spiral spring 50, and the plug 60 itself also needs self-positioning. The positioning reference of the plug 60 or the plug 60 is maintained firmly and stably in a double-locking manner. First, by the interference fit method of the insertion end 63 of the plug 60, the plug 60 is deformed to a certain extent and pressed into the inner hole of the central tube 40; second, the locking of the plug 60 relative to the upper end cover 80 is achieved through the limiting structure 65 between the plug 60 and the upper end cover 80.

[0026] The plug 60 is arranged between the sealing ring 30 of the upper end cover 80 and the central tube 40, has a water outlet 61 for conducting between the upper end cover 80 and the spiral flow channel, and is provided with a spring positioning structure 62. One end of the spiral spring 50 is snapped into the spring positioning structure 62 to limit the freedom of the spring.

[0027] In order to prevent the helical spring 50 from rotating and moving randomly under the impact of water flow, it is limited by the plug 60, and the plug is assembled and fixed by a double-locking method, realizing a relative fixed assembly structure among the central pipe 40, the helical flow channel 50, the plug 60 and the upper end cover 80.

[0028] The water outlet 61 on the plug 60 is opened on the circumferential surface of the plug 60, and the spring positioning structure 62 is arranged beside the water outlet 61, satisfying that the spring coiling direction of the spring positioning structure 62 outside the clamping end is on the side away from the water outlet. In this way, when the water flow guided along the helical spring 50 finally flows out of the upper end cover from the water outlet 61, the spring wire closest to the water outlet is away from the water outlet 61 and coils around the central pipe 40, and the spring wire closest to the water outlet 61 after one turn is at the maximum distance that can be reached, and then a film temperature thermometer / outlet water thermometer is arranged within this distance.

[0029] In this way, the structure of the water outlet 61 on the plug 60 can be satisfied: there is no coiled spring between the water outlet 61 and the outlet water thermometer / film temperature thermometer.

[0030] Please refer to the attached Figure 4 , a film temperature thermometer 72 and an outlet water thermometer 71 are provided on the thick film heating tube 70, and a film temperature thermometer 72 and an outlet water thermometer 71 are provided near the water outlet 61 of the plug 60 on the thick film heating tube 70, wherein the film temperature thermometer 72 and the outlet water thermometer 71 are arranged on the same generatrix of the thick film heating tube 70, and the film temperature thermometer is below the outlet water thermometer.

[0031] A heating film 73 is laid on the surface of the thick film heating tube 70, and the film temperature thermometer 72 and the outlet water thermometer 71 are arranged in a non-heating film area, and the reserved distance between the outlet water thermometer 71 and the heating film 73 is greater than or equal to 4 mm. This is to avoid the heat generated by the heating film 73 interfering with the temperature measurement process of the outlet water thermometer 71 and prevent the measured outlet water temperature from being inaccurate.

[0032] The above is only a preferred embodiment of the present invention, and it does not impose any form of limitation on the present invention. Although the present invention is disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, when making some changes or modifications using the above-disclosed technical content as equivalent changed equivalent embodiments, but as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical means of the present invention shall fall within the scope of the technical solution of the present invention.

Claims

1. A thick film heating element with a spiral flow channel, comprising a housing, a lower end cover, a sealing ring, a central tube, a spiral spring, a plug, a thick film heating tube and an upper end cover, characterized in that, A spiral spring is wound around the central tube, and a thick film heating tube is sleeved outside the central tube and the spiral spring. The outer surface of the central tube, the spiral spring and the inner wall of the thick film heating tube form a spiral flow channel. An outer shell is provided outside the thick film heating tube, and an upper end cover and a lower end cover are assembled up and down on the outer shell and sealed as a whole. A plug is assembled between the upper end cover and the central tube, and a limiting structure for defining the relative rotational freedom between the plug and the upper end cover is provided between the plug and the upper end cover.

2. The thick film heating element with a spiral flow channel according to claim 1, wherein The limiting structure includes a positioning groove and a positioning protrusion that match each other, and there are two or more pairs of the paired positioning grooves and positioning protrusions.

3. The thick film heating element with a spiral flow channel according to claim 2, characterized in that, Three positioning grooves are provided on the end face of the plug facing the upper end cover, and three positioning protrusions are provided on the corresponding upper end cover.

4. The thick film heating element with a spiral flow channel according to claim 3, characterized in that, The three positioning grooves are asymmetrically distributed in the circumferential direction.

5. The thick film heating element with a spiral flow channel according to claim 4, characterized in that, The plug includes an insertion end and a positioning end that are integrally formed. The outer diameter of the insertion end has an interference fit with the inner diameter of the central tube, and the insertion end is inserted into the central tube for assembly. The positioning end faces the upper end cover, and a positioning groove is provided on the end face facing the upper end cover.

6. The thick film heating element with a spiral flow channel according to claim 5, characterized in that, The plug is arranged between the sealing ring of the upper end cover and the central tube, and there is a water outlet for conducting between the upper end cover and the spiral flow channel, and a spring positioning structure is provided. One end of the spring is snapped into the spring positioning structure to limit the freedom of the spring.

7. The thick film heating element with a spiral flow channel according to claim 6, characterized in that, The water outlet on the plug is opened on the circumferential surface of the plug, and the spring positioning structure is arranged beside the water outlet, satisfying that the spiral direction of the spring where the spring positioning structure is arranged outside the clamping end is on the side away from the water outlet.

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