Resistor sacrificial anode structure

Abstract

The utility model belongs to the technical field of material corrosion cathode protection, and relates to a sacrificial anode structure of a resistor. The flange plate is additionally arranged on the middle rear section of the second rod core, the diameter of the flange plate is obviously larger than that of the second rod core, the design of the flange plate can prevent the second rod core from rotating and being pulled out relative to an injection molding part when a screw head is assembled or the second rod core is directly installed on a water heater, and stability of a resistor is improved. And the damage of the resistor sacrificial anode structure caused by installation is avoided. The step shaft is arranged at the end, close to the injection molding part, of the first rod core, so that the contact area between the first rod core and the injection molding part can be increased, the sealing performance between the first rod core and the injection molding part is effectively improved, water permeation is avoided, and the overall waterproof performance of the resistor sacrificial anode structure is enhanced. The spring gasket and the flat gasket are arranged between the screw head and the injection molding part, so that when the screw head is mounted, the impact of the second rod core on the injection molding part is effectively buffered, and the stability of the resistance sacrificial anode structure during assembly is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to material corrosion cathodic protection technical field relates to a resistance sacrificial anode structure. BACKGROUND

[0002] Water storage type water heater is extremely important in daily life, and the water tank as a core component is mostly made of steel material. Although it has enamel coating protection, it is still prone to corrosion and perforation in long-term immersion environment, which may cause water leakage and electric leakage, and finally lead to the water tank and the whole water heater being scrapped.

[0003] To prevent this situation, the existing technology mostly uses the principle of cathodic protection to connect a magnesium anode to the water tank to build a resistance sacrificial anode structure. Because magnesium has negative electricity in the medium, it can protect the steel base body, especially the enamel liner and stainless steel liner, by consuming itself to protect the water tank from corrosion. However, since the sacrificial anode relies on self-consumption, its service life is limited and needs to be replaced regularly. Users rarely replace the water tank when using the water heater, which poses a risk to the use of the water tank.

[0004] To this end, some water heater manufacturers have tried to add a resistor between the sacrificial anode and the water tank to reduce the protection current, slow down the consumption of the sacrificial anode, and prolong its service life. This process requires first preparing a sacrificial anode with a first rod core, then welding a resistor between the first rod core and a second rod core, then wrapping the resistor and the first rod core and the second rod core with injection molding, and finally installing a screw head at the exposed second rod core or directly installing it on the water heater through the threads on the exposed second rod core. During this process, the second rod core has a risk of rotating and pulling out when assembling the screw head or installing it on the water heater due to the low strength of the injection molding part, which may cause defects such as disconnection or short circuit of the resistor between the first rod core and the second rod core, thereby damaging the function of the resistance sacrificial anode. Therefore, there is an urgent need for a more reliable resistance sacrificial anode structure to solve the risk of rotation and pulling out of the second rod core relative to the injection molding part when assembling the screw head and the second rod core.

[0005] Therefore, the utility model is proposed. UTILITY MODEL CONTENTS

[0006] The utility model aims at overcoming the shortcomings of the prior art and providing a resistance sacrificial anode structure. By adding a flange plate to the second rod core, the diameter of the flange plate is significantly larger than that of the second rod core, and the special design of the flange plate can prevent the second rod core from rotating and pulling out relative to the injection molding part when assembling the screw head, thereby significantly improving the stability and reliability of the internal structure of the injection molding part.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0008] A resistance sacrificial anode structure comprises a magnesium rod, a first rod core coaxial with the magnesium rod and embedded in the magnesium rod at one end and exposed outside the magnesium rod at the other end, a second rod core coaxial with the first rod core and electrically connected to the first rod core through a resistance, and a plastic injection part in which the first rod core, the resistance and one end of the second rod core exposed outside the magnesium rod are arranged by injection molding, and the other end of the second rod core is exposed outside the plastic injection part and connected to a screw head.

[0009] A flange is arranged at the middle of the second rod core and in the plastic injection part to prevent the second rod core from rotating relative to the plastic injection part, the projection area of the flange in the axial direction of the magnesium rod is greater than the projection area of the second rod core in the axial direction of the magnesium rod, and the projection area of the flange in the axial direction of the magnesium rod is less than the projection area of the plastic injection part in the axial direction of the magnesium rod.

[0010] Specifically, the flange is polygonal or irregular in shape, and other shapes that can prevent the second rod core from rotating relative to the plastic injection part in the circumferential direction, the polygonal shape includes a square, a triangle, a hexagon and the like, and the diameter of the circumscribed circle of the flange is less than the diameter of the plastic injection part.

[0011] Specifically, a stepped shaft is arranged at the end of the first rod core close to the plastic injection part to improve the waterproof performance and connection stability of the resistance sacrificial anode structure, the stepped shaft can increase the contact area between the first rod core and the plastic injection part, thereby improving the sealing performance between the first rod core and the plastic injection part and preventing water from penetrating.

[0012] Specifically, a structure is arranged between the plastic injection part and the magnesium rod to prevent mutual rotation, and a protrusion or a groove is arranged at the end of the magnesium rod close to the plastic injection part, and the plastic injection part cooperates with the protrusion or the groove to form a corresponding structure when the plastic injection part is injection molded, thereby preventing relative rotation.

[0013] Specifically, the end of the first rod core and the end of the second rod core close to the resistance are flat in structure for facilitating welding of wires, and the resistance is welded to the first rod core and the second rod core through the wires.

[0014] Specifically, a screw head is screwed to the end of the second rod core exposed outside the plastic injection part.

[0015] Specifically, a spring washer and a flat washer are arranged in sequence between the screw head and the plastic injection part, and the spring washer and the flat washer are arranged at the end of the second rod core exposed outside the plastic injection part to fasten the connection between the second rod core and the screw head and improve the connection reliability.

[0016] Specifically, a sealing washer is arranged at the side of the screw head close to the magnesium rod to seal the connection between the screw head and a water tank.

[0017] Specifically, the flange and the second rod core are formed by one of cold heading, stamping, machining and welding.

[0018] Specifically, the first and second core rods are made of one of the following materials: Q235, 45# steel, or ML08Al.

[0019] Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects:

[0020] This invention adds a flange to the middle and rear section of the second rod core, with a diameter significantly larger than that of the second rod core. The flange design prevents the second rod core from rotating or being pulled out relative to the injection-molded parts when assembling the screw head or installing it on the water heater, thereby improving the stability of the resistor and avoiding damage to the sacrificial anode structure due to installation, thus preventing abnormal sacrificial anode function.

[0021] Furthermore, by setting a stepped shaft at the end of the first core near the injection molding component, the contact area between the first core and the injection molding component can be increased, effectively improving the sealing between the first core and the injection molding component, preventing water infiltration, and enhancing the overall waterproof performance and connection stability of the resistive sacrificial anode structure.

[0022] Furthermore, by setting a spring washer and a flat washer between the screw head and the injection molded part, the impact of the second rod core on the injection molded part is effectively buffered when the screw head is installed, which effectively improves the stability of the resistive sacrificial anode structure during assembly. Attached Figure Description

[0023] The accompanying drawings are incorporated in and form part of this specification, and together with the description, serve to explain the principles of this invention.

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the sacrificial anode structure of the resistor of this utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the sacrificial anode resistor of this utility model after the screw head is installed;

[0027] Figure 3 for Figure 2 Top view;

[0028] Figure 4 This is a schematic diagram of the structure of the second core rod of this utility model;

[0029] Figure 5 for Figure 4A schematic diagram of the projection of BB onto a square flange;

[0030] Figure 6 for Figure 4 A schematic diagram of the projection of BB onto the flange when the flange is triangular;

[0031] Figure 7 for Figure 4 A schematic diagram of the projection of BB onto the flange when it is hexagonal;

[0032] Figure 8 for Figure 4 A schematic diagram of the projection of BB onto the flange when the flange is irregularly shaped;

[0033] Figure 9 for Figure 4 A schematic diagram of the projection of BB onto the second core when one end of the core is a flat structure.

[0034] Wherein: 1 is magnesium rod; 2 is first rod core; 3 is second rod core; 4 is spring washer; 5 is sealing gasket; 6 is screw head; 7 is injection molded part; 8 is resistor; 9 is flat gasket. Detailed Implementation

[0035] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. The embodiments described below do not represent all embodiments consistent with this invention. Rather, they are merely examples consistent with some aspects of this invention as detailed in the appended claims.

[0036] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0037] Example 1

[0038] like Figure 1 , 4 As shown, this embodiment provides a resistive sacrificial anode structure, including a magnesium rod 1, a first core 2 coaxial with the magnesium rod 1 with one end embedded in the magnesium rod 1 and the other end exposed outside the magnesium rod 1, and a second core 3 coaxial with the first core 2 and electrically connected to the first core 2 through a resistor 8. One end of the first core 2, the resistor 8, and the second core 3 exposed outside the magnesium rod 1 are disposed in an injection molding component 7 by injection molding, and the other end of the second core 3 is exposed outside the injection molding component 7.

[0039] The second core 3 is provided with a flange in the middle of the injection molding component 7 to prevent the second core 3 from rotating relative to the injection molding component 7. The projected area of ​​the flange in the axial direction of the magnesium rod 1 is larger than the projected area of ​​the second core 3 in the axial direction of the magnesium rod 1, and the projected area of ​​the flange in the axial direction of the magnesium rod 1 is smaller than the projected area of ​​the injection molding component 7 in the axial direction of the magnesium rod 1.

[0040] Specifically, the flange is polygonal or irregular in shape (e.g., ...). Figure 8 As shown), and other shapes that prevent the second core 3 from rotating circumferentially relative to the injection molding part 7, the polygons include squares (such as... Figure 5 As shown), triangle (as shown) Figure 6 As shown), hexagon (as shown) Figure 7 As shown in the figure, the diameter of the outer circle of the flange is smaller than the diameter of the injection molded part 7.

[0041] Specifically, the first core 2 is provided with a stepped shaft at one end near the injection molding component 7 to improve the waterproof performance and connection stability of the resistive sacrificial anode structure. The stepped shaft can increase the contact area between the first core 2 and the injection molding component 7, thereby improving the sealing between the first core 2 and the injection molding component 7 and preventing water from seeping in.

[0042] Specifically, the injection molding component 7 and the magnesium rod 1 are provided with a structure to prevent mutual rotation; the end of the magnesium rod 1 near the injection molding component 7 is provided with a protrusion or groove. When the injection molding component 7 is injection molding, the injection molding component 7 cooperates with the protrusion or groove to form a corresponding structure, thereby preventing relative rotation.

[0043] Specifically, the flange and the second core rod 3 are formed by one of the following processes: cold heading, stamping, machining, and welding.

[0044] Specifically, the first core 2 and the second core 3 are made of one of Q235, 45# steel or ML08Al.

[0045] Example 2

[0046] The difference between this embodiment and Embodiment 1 is that, see [link to Embodiment 1] Figure 2 , 3 As shown, the end of the second rod core 3 exposed outside the injection molding component 7 is also screwed with a screw head 6.

[0047] For details, see Figure 2 As shown, a spring washer 4 and a flat washer 9 are sequentially arranged between the screw head 6 and the injection molding component 7. The spring washer 4 and the flat washer 9 are both inserted through the second rod core 3 and exposed at one end of the injection molding component 7.

[0048] Specifically, the screw head 6 is provided with a sealing gasket 5 on the side near the magnesium rod 1, which is connected and sealed to the water tank.

[0049] Embodiment 3

[0050] The difference between this embodiment and Embodiment 1 is that the first rod core 2 and the second rod core 3 are flat in structure near one end of the resistance 8 for facilitating welding of the wires, as shown in Figure 9 The resistance 8 is welded to the first rod core 2 and the second rod core 3 by wires respectively.

[0051] The above description is only a specific implementation of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application.

[0052] It should be understood that the present application is not limited to the above described and that various modifications and changes can be made without departing from the scope thereof. The scope of the present application is limited only by the claims appended hereto.

Claims

1. A resistive sacrificial anode structure, characterized by The application relates to a magnesium rod (1), a first rod core (2) coaxial with the magnesium rod (1) and embedded at one end of the magnesium rod (1) and exposed at the other end of the magnesium rod (1), a second rod core (3) coaxial with the first rod core (2) and electrically connected with the first rod core (2) through an electric resistor (8), and a plastic injection part (7) for embedding the first rod core (2), the electric resistor (8) and one end of the second rod core (3) exposed outside the magnesium rod (1) through injection molding, and the other end of the second rod core (3) exposed outside the plastic injection part (7). A flange is arranged at the middle part of the second rod core (3) and in the plastic injection part (7) to prevent the second rod core (3) from rotating relative to the plastic injection part (7), and the projection area of the flange in the axial direction of the magnesium rod (1) is larger than the projection area of the second rod core (3) in the axial direction of the magnesium rod (1).

2. The resistive sacrificial anode structure of claim 1, wherein, The flange is triangular, square, hexagonal or special-shaped.

3. The resistive sacrificial anode structure of claim 1, wherein, One end of the first rod core (2) close to the plastic injection part (7) is provided with a stepped shaft for improving the waterproof performance and connection stability of the electric resistor sacrificial anode structure.

4. The resistive sacrificial anode structure of claim 1, wherein, A structure is arranged between the plastic injection part (7) and the magnesium rod (1) to prevent mutual rotation.

5. The resistive sacrificial anode structure of claim 1, wherein, One end of the first rod core (2) and the second rod core (3) close to the electric resistor (8) is in a flat structure for facilitating welding of wires, and the electric resistor (8) is welded with the first rod core (2) and the second rod core (3) through wires.

6. The resistive sacrificial anode structure of claim 1, wherein, One end of the second rod core (3) exposed outside the plastic injection part (7) is further connected with a screw head (6).

7. The resistive sacrificial anode structure of claim 6, wherein, A spring washer (4) and a flat washer (9) are sequentially arranged between the screw head (6) and the plastic injection part (7).

8. The resistive sacrificial anode structure of claim 6, wherein, A sealing washer (5) is arranged on one side of the screw head (6) close to the magnesium rod (1) to be connected and sealed with a water tank.

9. The resistive sacrificial anode structure according to any of claims 1 to 8, characterized in that The flange and the second rod core (3) are formed through one of cold upsetting, stamping, machining and welding.

10. The resistive sacrificial anode structure according to any one of claims 1 to 8, wherein The material of the first rod core (2) and the second rod core (3) is one of Q235, 45# steel and ML08Al.

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