Protective structure and expansion tank

Abstract

The utility model relates to the technical field of protection accessories, in particular to a protection structure and an expansion tank. The protective structure comprises a cover body and a protective cap; the cover body and the protective cap are integrally formed, or the cover body is provided with a mounting part, the mounting part is provided with a containing groove, at least part of the protective cap is located in the containing groove, the outer surface of the protective cap comprises an anti-rotation part, the groove wall of the containing groove comprises an anti-rotation matching part, and the anti-rotation matching part abuts against the anti-rotation part for limiting so as to limit rotation of the cover body relative to the protective cap; the protective cap is provided with internal threads used for being connected with external threads of the valve core. During installation, the cover body and the protective cap can be installed on the valve core together, and when disassembly is needed, the cover body and the protective cap can be screwed off from the valve core together in a rotating mode, so that the installation process is simplified, and the assembly efficiency is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of protective accessories, and in particular to a protective structure and an expansion tank. Background Art

[0002] In the related art, for equipment with a valve core assembly (such as an expansion tank), it is necessary to additionally use a dust cap to prevent dust from entering the valve core assembly. Taking the expansion tank as an example, the valve core assembly of the expansion tank includes a valve core with an external thread and a valve cap installed on the valve core. The valve cap is cylindrical in shape, and its main function is to seal the valve core. When installing the dust cap, it is necessary to first screw the valve cap onto the external thread of the valve core, and then put the dust cap on the valve cap. When performing the filling operation, it is necessary to first remove the valve cap. If the dust cap is rotated, it will rotate relative to the valve cap, which makes it inconvenient to remove the valve cap and the dust cap at the same time. Instead, it is necessary to first pull the dust cap off the nut, and then unscrew the valve cap from the valve core. The disassembly and assembly process is relatively complicated. Utility Model Content

[0003] The purpose of the present disclosure is to provide a protective structure and an expansion tank to simplify the disassembly and assembly process and improve assembly efficiency.

[0004] Based on the above purpose, the present disclosure provides a protective structure, including a cover body and a protective cap;

[0005] The cover body and the protective cap are integrally formed, or the cover body is provided with a mounting portion, the mounting portion is provided with a receiving groove, at least part of the protective cap is located in the receiving groove, the outer surface of the protective cap includes an anti-rotation portion, the groove wall of the receiving groove includes an anti-rotation matching portion, the anti-rotation matching portion abuts against the anti-rotation portion to limit the cover body from rotating relative to the protective cap;

[0006] The protective cap is provided with an internal thread for connecting with the external thread of the valve core.

[0007] In one embodiment of the present disclosure, the cover body is provided with a mounting portion, the mounting portion is provided with a receiving groove, at least a portion of the protective cap is located in the receiving groove, the outer surface of the protective cap includes an anti-rotation portion, the groove wall of the receiving groove includes an anti-rotation matching portion, the anti-rotation matching portion abuts against the anti-rotation portion to limit the cover body from rotating relative to the protective cap, one of the anti-rotation portion and the anti-rotation matching portion is a protrusion and the other is a groove, or the anti-rotation portion and the anti-rotation matching portion are non-arc surfaces that cooperate with each other.

[0008] In one embodiment of the present disclosure, the cover body is provided with a mounting portion, the mounting portion is provided with a receiving groove, at least a portion of the protective cap is located in the receiving groove, the outer surface of the protective cap includes an anti-rotation portion, the groove wall of the receiving groove includes an anti-rotation matching portion, the anti-rotation matching portion abuts against the anti-rotation portion to limit the cover body from rotating relative to the protective cap, the anti-rotation portion is a hexagonal prism surface, the cross-section of the groove wall of the receiving groove is hexagonal, at least a portion of the groove wall of the receiving groove forms the anti-rotation matching portion, and the anti-rotation portion is fitted against the anti-rotation matching portion.

[0009] In one embodiment of the present disclosure, when the cover body and the protective cap are integrally formed, a reinforcing rib is arranged between the cover body and the protective cap, the reinforcing rib is a triangular plate-like structure, a first side of the reinforcing rib is in contact with the inner surface of the cover body, a second side of the reinforcing rib is in contact with the outer surface of the protective cap, and a third side of the reinforcing rib is supported between the cover body and the protective cap.

[0010] In one embodiment of the present disclosure, a reinforcing rib is provided between the cover body and the protective cap, the reinforcing rib is a triangular plate-shaped structure, a first side of the reinforcing rib is in contact with the inner surface of the cover body, a second side of the reinforcing rib is in contact with the outer surface of the protective cap or the outer surface of the mounting portion, and a third side of the reinforcing rib is supported between the cover body and the mounting portion.

[0011] In one embodiment of the present disclosure, the mounting portion is located inside the cover body, and the end surface of the protective cap away from the bottom of the receiving groove is flush with the end surface of the mounting portion provided with the receiving groove.

[0012] In one embodiment of the present disclosure, the cover body is in a truncated cone shape, and has a top surface and a bottom surface. The diameter of the top surface is smaller than the diameter of the bottom surface. The top surface is a plane, and the bottom surface is provided with a accommodating cavity. At least a portion of the protective cap is located in the accommodating cavity.

[0013] In one embodiment of the present disclosure, the circumferential surface of the cover body is provided with a plurality of recessed portions which are recessed inward from the outer surface, and the plurality of recessed portions are arranged at intervals along the circumferential direction.

[0014] Based on the above purpose, the present disclosure also provides an expansion tank, including a tank body, a valve core and the protective structure, wherein the valve core is installed on the tank body, and the protective cap is threadedly connected to the valve core.

[0015] In one embodiment of the present disclosure, one end of the valve core extends into the interior of the tank body, and the other end protrudes from the top of the tank body; the protective cap is located inside the cover body;

[0016] Alternatively, a groove is provided on the top of the tank body, the valve core is arranged in the groove, one end of the protective cap protrudes from the cover body, and the part of the protective cap protruding from the cover body extends into the groove to be connected with the valve core.

[0017] The beneficial effects of the present disclosure are mainly:

[0018] The protective structure provided by the present invention can install the protective cap on the external thread of the valve core by arranging an internal thread on the protective cap, and ensure that the cover body and the protective cap will not rotate relative to each other by forming the cover body and the protective cap as one piece, or by arranging a mounting portion on the cover body, the mounting portion is provided with a receiving groove, at least part of the protective cap is located in the receiving groove, the outer surface of the protective cap includes an anti-rotation portion, the groove wall of the receiving groove includes an anti-rotation matching portion, the anti-rotation matching portion abuts against the anti-rotation portion to limit the rotation of the cover body relative to the protective cap; during installation, the cover body and the protective cap can be installed on the valve core together, and when disassembly is required, the cover body and the protective cap can also be unscrewed from the valve core together by rotating, thereby simplifying the installation process and improving assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the specific embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of the structure of the protection structure provided by the embodiment of the present disclosure;

[0021] Figure 2 A structural schematic diagram of a protective structure provided by an embodiment of the present disclosure from another perspective;

[0022] Figure 3 A front view of a protective structure provided by an embodiment of the present disclosure;

[0023] Figure 4 Another structural schematic diagram of a protective structure provided by an embodiment of the present disclosure;

[0024] Figure 5 for Figure 4 A schematic diagram of the structure of the cover body in the protective structure shown;

[0025] Figure 6 for Figure 4 A schematic diagram of the structure of a protective cap in the protective structure shown;

[0026] Figure 7A third structural schematic diagram of the protection structure provided in an embodiment of the present disclosure.

[0027] The following are the descriptions of the reference numerals:

[0028] 1-cover body; 11-top surface; 12-bottom surface; 13-reinforcement ribs; 14-recessed portion; 15-installation portion; 151-anti-rotation matching portion; 2-protective cap; 21-internal thread; 22-anti-rotation portion. DETAILED DESCRIPTION

[0029] The technical solution of the present disclosure will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present disclosure.

[0030] In the description of the present disclosure, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", 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 disclosure 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 operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. In addition, if the terms "first", "second", "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0032] See also Figures 1 to 7 As shown, this embodiment provides a protective structure, including a cover body 1 and a protective cap 2. The cover body 1 is fixedly connected to the protective cap 2 to limit the relative rotation of the cover body 1 and the protective cap 2. The protective cap 2 is provided with an internal thread 21 for connecting with the external thread of the valve core.

[0033] The protective structure provided in this embodiment can install the protective cap 2 on the external thread of the valve core by setting an internal thread 21 on the protective cap 2. Since the cover body 1 and the protective cap 2 are fixedly connected, the cover body 1 and the protective cap 2 will not rotate relative to each other. During installation, the cover body 1 and the protective cap 2 can be installed on the valve core together. When disassembly is required, the cover body 1 and the protective cap 2 can also be unscrewed from the valve core together by rotation, which simplifies the installation process and improves assembly efficiency.

[0034] Exemplarily, the protective structure provided in this embodiment is used to be installed on the valve core of the expansion tank, and can prevent dust and water. In other embodiments, the protective structure can also be installed on the valve core of other equipment.

[0035] It should be understood that the fixed connection between the cover body 1 and the protective cap 2 may include a detachable fixed connection or a non-detachable fixed connection.

[0036] In a possible design, the protective structure includes a cover body 1 and a protective cap 2; the cover body 1 and the protective cap 2 are integrally formed, and the protective cap is provided with an internal thread 21 for connecting with an external thread of the valve core.

[0037] Exemplarily, the cover body 1 and the protective cap 2 can be integrally formed by injection molding.

[0038] In one embodiment, see Figures 1 to 3 As shown, the cover body 1 is in a truncated cone shape, and has a top surface 11 and a bottom surface 12. The diameter of the top surface 11 is smaller than the diameter of the bottom surface 12. The top surface 11 is a plane, and the bottom surface 12 is provided with a receiving cavity, and at least part of the protective cap 2 is located in the receiving cavity. After the user removes the protective structure from the valve core, the cover body 1 can be placed on a workbench or the ground with the top surface 11 facing downward to ensure that the protective structure will not roll arbitrarily. At the same time, since the bottom surface 12 with a larger diameter faces upward, it is convenient for the user to take it.

[0039] For example, see Figure 3 As shown, the protective cap 2 is completely located in the accommodating cavity.

[0040] In other embodiments, a portion of the protective cap may extend to the outside of the cover body, that is, one end of the protective cap is located outside the accommodating cavity.

[0041] It should be noted that whether the protective cap 2 extends to the outside of the cover body can be selected according to the installation form of the valve core in the equipment with the valve core assembly (such as an expansion tank).

[0042] In this possible design, see Figure 1As shown, a reinforcing rib 13 is provided between the cover body 1 and the protective cap 2. The reinforcing rib 13 is a triangular plate-shaped structure. The first side of the reinforcing rib 13 is in contact with the inner surface of the cover body 1, the second side of the reinforcing rib 13 is in contact with the outer surface of the protective cap 2, and the third side of the reinforcing rib 13 is supported between the cover body 1 and the protective cap 2.

[0043] By providing the reinforcing ribs 13, which are triangular plate-shaped structures, on the one hand, the compressive resistance of the protective structure can be improved and the impact of external forces on the expansion tank can be reduced; on the other hand, the connection strength between the protective cap 2 and the cover body 1 can be increased to improve the overall structural strength of the protective structure.

[0044] Exemplarily, the protective cap 2 can be a hollow cylindrical structure, the protective cap 2 is coaxially arranged with the cover body 1 , the reinforcing ribs 13 are plate-like structures, there are multiple reinforcing ribs 13 , and the multiple reinforcing ribs 13 are arranged at intervals along the circumference of the protective cap 2 .

[0045] In this embodiment, the number of the reinforcing ribs 13 may be six, and the six reinforcing ribs 13 are evenly spaced along the circumference of the protective cap 2 .

[0046] In one embodiment, the circumferential surface of the cover body 1 is provided with a plurality of recessed portions 14 which are recessed inward from the outer surface, and the plurality of recessed portions 14 are arranged at intervals along the circumferential direction.

[0047] For example, see Figure 2 and Figure 4 As shown, the number of the recessed portions 14 in this embodiment is six, and the six recessed portions 14 are evenly spaced along the circumference of the cover body 1. This approach is not only ergonomic, but also can reduce material usage and reduce costs.

[0048] Exemplarily, the inner surface of the recessed portion 14 may be a spherical cap curved surface.

[0049] In another possible design, see Figures 4 to 6 As shown, the protective structure includes a cover body 1 and a protective cap 2; the cover body 1 is provided with a mounting portion 15, and the mounting portion 15 is provided with a receiving groove; the protective cap 2 is installed in the receiving groove, and the outer surface of the protective cap 2 is provided with an anti-rotation portion 22, and the groove wall of the receiving groove is provided with an anti-rotation matching portion 151, and the anti-rotation matching portion 151 cooperates with the anti-rotation portion 22 to limit the cover body 1 from rotating relative to the protective cap 2; the protective cap 2 is provided with an internal thread 21 for connecting with the external thread of the valve core.

[0050] In this embodiment, the mounting portion 15 and the cover body 1 are integrally formed.

[0051] In this other possible design, see Figure 4 and Figure 5As shown, the cover body 1 is in a truncated cone shape, and has a top surface 11 and a bottom surface 12. The diameter of the top surface 11 is smaller than the diameter of the bottom surface 12. The top surface 11 is a plane, and the bottom surface 12 is provided with a receiving cavity, and at least part of the mounting portion 15 is located in the receiving cavity. After the user removes the protective structure from the valve core, the cover body 1 can be placed on a workbench or the ground with the top surface 11 facing downward to ensure that the protective structure will not roll arbitrarily. At the same time, since the bottom surface 12 with a larger diameter faces upward, it is convenient for the user to take it.

[0052] In another possible design, the mounting portion 15 is located inside the cover body 1 , and the end surface of the protective cap 2 away from the bottom of the receiving groove is flush with the end surface of the mounting portion 15 provided with the receiving groove.

[0053] Of course, the end surface of the protective cap 2 away from the bottom of the receiving groove may also be located outside the receiving groove.

[0054] It should be noted that whether the protective cap 2 extends out of the receiving groove can be selected according to the installation form of the valve core in the equipment with the valve core assembly (such as an expansion tank).

[0055] In some embodiments, the anti-rotation portion 22 and the anti-rotation matching portion 151 are non-circular arc surfaces that match each other.

[0056] Exemplarily, at least part of the circumferential outer surface of the protective cap 2 forms an anti-rotation portion 22, the cross-section of the protective cap 2 may be elliptical, and the contour of the groove wall of the accommodating groove is adapted to the ellipse. After the protective cap 2 is installed on the mounting portion 15, the protective cap 2 will not rotate relative to the mounting portion 15, that is, the protective cap 2 will not rotate relative to the cover body 1.

[0057] Of course, the shape of the cross section of the protective cap 2 is not limited to an ellipse, and may also be a polygon or other special shapes, as long as at least part of the surface of the protective cap 2 is not an arc surface.

[0058] In this embodiment, see Figure 6 As shown, the anti-rotation portion 22 is a hexagonal prism, the cross-section of the groove wall of the receiving groove is a hexagon, at least part of the groove wall of the receiving groove forms an anti-rotation matching portion 151, and the anti-rotation portions are arranged in close contact with each other.

[0059] Exemplarily, the anti-rotation portion 22 is the circumferential outer surface of the protective cap 2, and the protective cap 2 may be a hexagonal prism structure, and the hexagonal prism structure is provided with an internal thread 21. Of course, the anti-rotation portion 22 may also be a part of the circumferential outer surface of the protective cap 2. Exemplarily, the protective cap 2 may include a coaxially arranged hexagonal prism structure and a cylindrical structure, wherein the hexagonal prism structure is located in the receiving groove, and the cylindrical structure may be located outside the receiving groove, or even outside the cover body, and the cylindrical structure and at least part of the hexagonal prism structure are both provided with internal threads.

[0060] In some embodiments, see Figure 4 As shown, a portion of the protective cap 2 is located in the accommodating cavity, and another portion is located outside the cover body.

[0061] In other embodiments, the protective cap 2 may also be completely located in the accommodating cavity.

[0062] It should be noted that whether the protective cap 2 extends to the outside of the cover body can be selected according to the installation form of the valve core in the equipment with the valve core assembly (such as an expansion tank).

[0063] It should be noted that only a portion of the groove wall of the accommodating groove may cooperate with the anti-rotation portion 22 , and this portion of the groove wall forms the anti-rotation cooperation portion 151 .

[0064] In other embodiments, one of the anti-rotation portion 22 and the anti-rotation matching portion 151 is a protrusion, and the other is a groove.

[0065] For example, see Figure 7 As shown, the anti-rotation portion 22 can be a protrusion provided on the circumferential surface of the protective cap 2, and the anti-rotation matching portion 151 can be a groove provided on the groove wall of the accommodating groove. After assembly, the protrusion is limited in the groove, thereby preventing the cover body 1 from rotating relative to the protective cover. The protective cover and the mounting portion 15 can be interference fit.

[0066] In one embodiment, see Figure 5 As shown, a reinforcing rib 13 is arranged between the cover body 1 and the mounting portion 15. The reinforcing rib 13 is a triangular plate-shaped structure. The first side of the reinforcing rib 13 is in contact with the inner surface of the cover body 1, the second side of the reinforcing rib 13 is in contact with the outer surface of the mounting portion 15, and the third side of the reinforcing rib 13 is supported between the cover body 1 and the mounting portion 15.

[0067] By providing the reinforcing ribs 13, which are in a triangular plate-shaped structure, the structural strength of the protective structure can be improved, thereby improving the compressive performance of the protective structure and reducing the impact of external forces on the expansion tank.

[0068] Exemplarily, the outer surface of the mounting portion 15 is a cylindrical surface, the mounting portion 15 is coaxially arranged with the cover body 1 , there are multiple reinforcing ribs 13 , and the multiple reinforcing ribs 13 are arranged at intervals along the circumference of the mounting portion 15 .

[0069] In this embodiment, the number of the reinforcing ribs 13 may be six, and the six reinforcing ribs 13 are evenly spaced along the circumference of the mounting portion 15 .

[0070] This embodiment also provides an expansion tank, including a tank body, a valve core and a protective structure provided in this embodiment, the valve core is installed on the tank body, and the protective cap is threadedly connected to the valve core.

[0071] The expansion tank provided in this embodiment uses the protective structure provided in this embodiment. When installing the protective structure, the cover body 1 and the protective cap 2 can be installed on the valve core together. When the protective structure needs to be removed, the cover body 1 and the protective cap 2 can be unscrewed from the valve core together by rotating, which simplifies the installation process and improves assembly efficiency.

[0072] In some embodiments, one end of the valve core extends into the interior of the expansion tank, and the other end protrudes from the top of the expansion tank. At this time, the protective cap 2 can be directly installed on the valve core, and the end of the protective cap 2 may not protrude from the cover body 1.

[0073] In other embodiments, a groove is provided on the top of the tank body, the valve core is arranged in the groove, and the portion of the protective cap 2 protruding from the outside of the cover body extends into the groove to cooperate with the valve core.

[0074] It should be understood that the above two installation methods of the valve core in the expansion tank should be understandable to those skilled in the art, and are well known and easy to implement for those skilled in the art, so they will not be described in detail in this embodiment.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A protective structure, characterized in that: Including a cover body and a protective cap; The cover body is integrally formed with the protective cap, or the cover body is provided with a mounting portion, the mounting portion is provided with a receiving groove, at least a portion of the protective cap is located in the receiving groove, the outer surface of the protective cap includes an anti-rotation portion, the groove wall of the receiving groove includes an anti-rotation matching portion, the anti-rotation matching portion abuts against the anti-rotation portion to limit the cover body from rotating relative to the protective cap; The protective cap is provided with an internal thread for connecting with the external thread of the valve core.

2. The protective structure according to claim 1, characterized in that: The cover body is provided with a mounting portion, the mounting portion is provided with a receiving groove, at least part of the protective cap is located in the receiving groove, the outer surface of the protective cap includes an anti-rotation portion, the groove wall of the receiving groove includes an anti-rotation matching portion, the anti-rotation matching portion abuts against the anti-rotation portion to limit the cover body from rotating relative to the protective cap, one of the anti-rotation portion and the anti-rotation matching portion is a protrusion, and the other is a groove, or the anti-rotation portion and the anti-rotation matching portion are non-arc surfaces that cooperate with each other.

3. The protective structure according to claim 1, characterized in that: The cover body is provided with a mounting portion, the mounting portion is provided with a receiving groove, at least part of the protective cap is located in the receiving groove, the outer surface of the protective cap includes an anti-rotation portion, the groove wall of the receiving groove includes an anti-rotation matching portion, the anti-rotation matching portion abuts against the anti-rotation portion to limit the cover body from rotating relative to the protective cap, the anti-rotation portion is a hexagonal prism surface, the cross-section of the groove wall of the receiving groove is in the shape of a hexagon, at least part of the groove wall of the receiving groove forms the anti-rotation matching portion, and the anti-rotation portion is fitted against the anti-rotation matching portion.

4. The protective structure according to claim 1, characterized in that: When the cover body and the protective cap are integrally formed, a reinforcing rib is arranged between the cover body and the protective cap, and the reinforcing rib is a triangular plate-shaped structure. The first side of the reinforcing rib is in contact with the inner surface of the cover body, the second side of the reinforcing rib is in contact with the outer surface of the protective cap, and the third side of the reinforcing rib is supported between the cover body and the protective cap.

5. The protective structure according to claim 2 or 3, characterized in that: A reinforcing rib is arranged between the cover body and the protective cap, and the reinforcing rib is a triangular plate-shaped structure. The first side of the reinforcing rib is in contact with the inner surface of the cover body, the second side of the reinforcing rib is in contact with the outer surface of the protective cap or the outer surface of the mounting portion, and the third side of the reinforcing rib is supported between the cover body and the mounting portion.

6. The protective structure according to claim 2 or 3, characterized in that: The mounting portion is located inside the cover body, and the end surface of the protective cap away from the bottom of the receiving groove is flush with the end surface of the mounting portion provided with the receiving groove.

7. The protective structure according to any one of claims 1 to 4, characterized in that: The cover body is in a truncated cone shape and has a top surface and a bottom surface. The diameter of the top surface is smaller than the diameter of the bottom surface. The top surface is a plane. The bottom surface is provided with a receiving cavity. At least part of the protective cap is located in the receiving cavity.

8. The protective structure according to claim 7, characterized in that: The circumferential surface of the cover body is provided with a plurality of recessed parts which are recessed inward from the outer surface, and the plurality of recessed parts are arranged at intervals along the circumferential direction.

9. An expansion tank, characterized in that: The invention comprises a tank body, a valve core and the protective structure according to any one of claims 1 to 8, wherein the valve core is mounted on the tank body, and the protective cap is threadedly connected to the valve core.

10. The expansion tank according to claim 9, characterized in that One end of the valve core extends into the interior of the tank body, and the other end protrudes from the top of the tank body; the protective cap is located inside the cover body; Alternatively, a groove is provided on the top of the tank body, the valve core is arranged in the groove, one end of the protective cap protrudes from the cover body, and the part of the protective cap protruding from the cover body extends into the groove to be connected with the valve core.

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