CN213546745U - Lamp holder adapter and lamp - Google Patents

Abstract

The utility model belongs to the technical field of lighting apparatus, especially, relate to a lamp holder adapter and lamps and lanterns. The lamp holder adapter comprises a conductive outer ring sleeve and an insulated inner ring sleeve, wherein an outer wall surface of the conductive outer ring sleeve is provided with an external thread, the inner ring sleeve is embedded in the conductive outer ring sleeve and is used for being matched with a lamp holder connected with a screw bulb, the conductive outer ring sleeve is provided with an electric contact part extending to the inside of the inner ring sleeve, and the lamp holder is electrically connected with the conductive outer ring sleeve through the electric contact part. This lamp holder adapter can expand the lamp holder size of big or small specification screw bulb, makes in the screw socket that small specification screw bulb can correspond the installation to big specification screw bulb and correspond, and like this, the screw socket of great specification can correspond the screw bulb of installing multiple less specification for the screw socket that big specification screw bulb corresponds has certain universality, under the scene of inconvenient a plurality of screw sockets of installing, provides the guarantee for satisfying the use needs of multiple specification screw bulb.

Description

Lamp holder adapter and lamp

Technical Field

The utility model belongs to the technical field of lighting apparatus, especially, relate to a lamp holder adapter and lamps and lanterns.

Background

The screw bulb is a lamp with a screw cap made of metal materials, the screw cap is used as an electrode of a lamp body and is in threaded connection with a screw socket of the bulb, and therefore electric conduction between the lamp body and the socket is achieved. Generally, screw bases of screw bulbs have different specifications such as E12, E27 and E39, wherein the base of the E12 specification needs to be matched with a socket of the E12 specification for use, the base of the E27 or E39 specification needs to be matched with a socket of the E27 or E39 specification for use, and the socket corresponding to the base of the E27 or E39 specification cannot use the base of the E12 specification, that is, the base of the smaller specification cannot use the socket of the larger specification. Therefore, when bulbs with different specifications need to be replaced, the sockets matched with the bulbs need to be replaced correspondingly to ensure normal use, but in the actual use process, the replacement difficulty of the sockets is far greater than that of the bulbs, so that the problem that the bulbs with proper specifications cannot be used due to limited replacement of the sockets often occurs; in addition, for a use scenario in which it is desired to reduce the number of sockets as much as possible while lighting with bulbs of different specifications, it is not possible to satisfy the use requirement for one socket to which one bulb of one specification is mounted.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a lamp holder adapter and lamps and lanterns aims at solving the unable technical problem who uses big specification socket of the screw bulb of the small and medium size lamp holder of prior art.

In order to achieve the above object, the utility model adopts the following technical scheme: there is provided a lamp cap adapter comprising:

the outer wall surface of the conductive outer ring sleeve is provided with external threads;

the insulating inner ring sleeve is embedded in the conductive outer ring sleeve and is used for being matched and connected with a lamp holder of the screw bulb;

the conductive outer ring sleeve is provided with an electric contact part extending to the inside of the inner ring sleeve, and the lamp holder is electrically connected with the conductive outer ring sleeve through the electric contact part.

In some embodiments, the conductive outer ring sleeve has a first outer opening end and a second outer opening end which are oppositely arranged and used for the lamp holder to sequentially pass through, the inner ring sleeve has a first inner opening end and a second inner opening end which are oppositely arranged, the end part of the second outer opening end is turned over towards the inner ring sleeve to form a connecting part, the end part of the connecting part is turned over along the axial direction of the inner ring sleeve and extends to the inner wall surface attached to the second inner opening end to form an electric contact part, and the position of the inner ring sleeve between the electric contact part and the first inner opening end is suitable for being connected with the lamp holder through threaded interference fit.

In some embodiments, an end surface of the first inner open end is turned radially outward of the inner collar to form a rim against which an end surface of the first outer open end abuts.

In some embodiments, a step portion is further formed at a position where the inner annular sleeve is connected with the rim portion, and a position of the inner annular sleeve between the electrical contact portion and the step portion is suitable for being connected with the lamp cap in a matched mode.

In some embodiments, the first inner open end chamfer forms a guide ramp.

In some embodiments, the stepped portion is provided with a concave hole for inserting a disassembling tool along the axial direction of the inner ring sleeve.

In some embodiments, the inner ring sleeve is provided with internal threads at the part where the inner ring sleeve is connected with the lamp cap in a matching way.

In some embodiments, the inner annular sleeve is made of a resilient or rigid rubber or plastic material.

In some embodiments, the inner annular sleeve is an integrally formed structure with the conductive outer annular sleeve as an insert.

The utility model provides an above-mentioned one or more technical scheme in the lamp holder adapter have one of following technological effect at least: when the socket is used, the lamp holder of the small-size screw bulb is inserted into the inner ring sleeve, the lamp holder is connected into the inner ring sleeve in a tight fit mode, the lamp holder adapter is stably connected onto the lamp holder, the lamp holder connector and the screw bulb form a whole, then the conductive outer ring sleeve is screwed into the screw socket, the lamp holder is electrically connected with the conductive outer ring sleeve through the electric contact portion, and therefore the screw bulb and the screw socket are electrically connected. Therefore, the connection size of the lamp holder part of the screw bulb with large and small specifications can be expanded by arranging the lamp holder adapter, so that the screw bulb with small specifications can be correspondingly installed in the screw socket corresponding to the screw bulb with large specification, the screw socket with large specification can be suitable for installing various screw bulbs with small specification, the screw socket does not need to be replaced when the screw bulb needs to be replaced, the specification of the lamp holder only needs to be expanded to the specification matched with the screw socket by replacing the lamp holder connector corresponding to the screw socket, and the screw bulb is more flexible and convenient to replace; and a screw socket is correspondingly provided with a plurality of screw bulbs, the screw socket corresponding to the large-size screw bulb has certain universality, and under the scene that the screw sockets are inconvenient to install, guarantee is provided for meeting the use requirements of the screw bulbs with various specifications.

The utility model discloses another technical scheme be: the lamp comprises a screw socket, a screw bulb and the lamp holder adapter, wherein the screw socket is connected with the external thread of the lamp holder adapter in a matched manner; the lamp holder of the screw bulb is connected with the inner ring sleeve of the lamp holder adapter in a matching way.

The utility model provides an above-mentioned one or more technical scheme in the lamps and lanterns have one of following technological effect at least: the screw bulb passes through the lamp holder adapter and is connected with the screw socket for in the screw bulb of small dimension can correspond the screw socket of installing to the screw bulb of big specification correspondence, the screw bulb of small dimension can be sold with the screw socket of big specification together packing, and can not have the unable circumstances of using of cooperation of screw bulb and screw socket, the screw bulb is higher with the adaptation flexibility ratio of screw socket, and it is more convenient to use.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is a perspective view of a lamp adapter according to an embodiment of the present invention;

FIG. 2 is a sectional view taken along line A-A of FIG. 1;

FIG. 3 is an exploded view of the adapter of the lamphead of FIG. 1;

fig. 4 is a perspective view of the conductive outer collar of the lamp adapter of fig. 1;

FIG. 5 is a cross-sectional view taken along line B-B of FIG. 4;

FIG. 6 is a perspective view of an inner collar of the adapter of FIG. 1;

FIG. 7 is a cross-sectional view taken along line C-C of FIG. 6;

fig. 8 is an assembled perspective view of the screw bulb and the lamp adapter shown in fig. 1 according to the embodiment of the present invention;

FIG. 9 is a cross-sectional view taken along line D-D of FIG. 8;

fig. 10 is an enlarged view of fig. 9 at a.

Wherein, in the figures, the respective reference numerals:

10-lamp cap adapter; 11-conductive outer ring sleeve; 111-external threads; 112-an electrical contact; 113-a first outer open end; 114-a second outer open end; 115-a connecting portion; 12-inner ring sleeve; 121-internal threads; 122-a first inner open end; 123-a second inner open end; 124-edge part; 125-step portion; 126-a guide ramp; 127-concave hole; 20-bulb; 21-a lamp cap; 22-a transition boss; 221-an insulating ring; 23-lamp envelope.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to fig. 1 to 10 are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

As shown in fig. 1 and 9, an embodiment of the present invention provides a lamp adapter 10, wherein the lamp adapter 10 is adapted to be connected to a lamp cap 21 of a screw bulb 20 to enlarge the size of the lamp cap 21 of the screw bulb 20, so that a small screw bulb 20 can be correspondingly installed in a screw socket corresponding to a large screw bulb 20.

Specifically, as shown in fig. 1 to 3, the lamp adapter 10 of the present embodiment includes a conductive outer sleeve 11 and an insulating inner sleeve 12, wherein the conductive outer sleeve 11 is made of a conductive material such as metal, and the insulating inner sleeve 12 is made of an insulating material such as rubber. The outer wall surface of the conductive outer ring sleeve 11 is provided with an external thread 111, and the external thread 111 is matched with the internal thread of the screw socket, so that the conductive outer ring sleeve 11 can be screwed in the screw socket and is electrically connected with the screw socket; the inner ring 12 is embedded in the conductive outer ring 11, and the inner ring 12 is used to match with the base 21 of the screw bulb 20, so as to connect the screw bulb 20 to the base 21 of the screw bulb 20 through the base adapter 10 of the present embodiment, as shown in fig. 8 and 9. Further, the conductive outer ring 11 has an electrical contact 112 extending into the inner ring 12, when the lamp head 21 is connected to the inner ring 12, the lamp head 21 can be electrically connected to the conductive outer ring 11 through the electrical contact 112, so that after the lamp head 21 of the screw bulb 20 is connected to the lamp head adapter 10 of the present embodiment, the lamp head adapter 10 is screwed into the corresponding screw socket, the screw lamp head 21 of the screw bulb 20 is electrically connected to the conductive outer ring 11 through the electrical contact 112, and the conductive outer ring 11 is electrically connected to the screw socket through the outer thread 111 thereof, so that the screw bulb 20 and the screw socket are electrically connected, and the screw bulb 20 can be normally powered on for use.

The embodiment of the utility model provides a lamp holder adapter 10, during the use, insert interior ring cover 12 with lamp holder 21 of small dimension screw bulb 20 in, lamp holder 21 cooperation is connected in interior ring cover 12, thereby on being connected to lamp holder 21 with lamp holder adapter 10 is firm, lamp holder adapter 10 forms a whole with screw bulb 20, in will leading electrically conductive outer ring cover 11 screw in screw socket again afterwards, lamp holder 21 passes through electric contact 112 and leads electrically conductive outer ring cover 11 electrical property and links to each other, thereby the electrical property switches on screw bulb 20 and screw socket. In this way, the connection size of the lamp head 21 of the screw bulb 20 with the large and small specifications can be expanded by the lamp head adapter 10, so that the screw bulb 20 with the small specification can be correspondingly installed in the screw socket corresponding to the screw bulb 20 with the large specification, for example, the screw bulb 20 with the E12 specification can be installed in the screw socket with the E27 specification by arranging the external thread 111 of the conductive outer ring sleeve 11 to be matched with the internal thread of the screw socket with the E27 specification and arranging the inner ring sleeve 12 to be matched and connected with the lamp head 21 of the screw bulb 20 with the E12 specification, and the screw bulb 20 with the E12 specification can still be normally used without using the screw socket with the E12 specification. Thus, by using the lamp holder adapter 10 of the embodiment, a large-size screw socket can be suitable for installing various small-size screw bulbs 20, the screw socket does not need to be replaced when the screw bulb 20 needs to be replaced, and only the lamp holder adapter 10 corresponding to the screw socket needs to be replaced to expand the specification of the lamp holder 21 to the specification matched with the screw socket, so that the screw bulb 20 is more flexible and convenient to replace; and a plurality of screw bulbs 20 are correspondingly arranged on one screw socket, the screw socket corresponding to the large-size screw bulb 20 has certain universality, and under the scene that a plurality of screw sockets are inconvenient to arrange, guarantee is provided for meeting the use requirements of the screw bulbs 20 with various specifications.

In another embodiment of the present invention, as shown in fig. 4 and 5, the conductive outer ring 11 has a first outer opening end 113 and a second outer opening end 114 which are oppositely disposed and used for the lamp head 21 to sequentially pass through, specifically, when the lamp head adapter 10 of the present embodiment is connected to the lamp head 21 of the screw bulb 20, the end of the lamp head 21 which is the other electrode of the screw bulb 20 extends out from the second outer opening end 114, so that the end of the lamp head 21 can be electrically conducted with the corresponding position of the screw socket. As shown in fig. 6 and 7, the inner ring 12 has a first inner opening end 122 and a second inner opening end 123 which are oppositely arranged, an end of the second outer opening end 114 is turned over toward the inner ring 12 to form a connecting portion 115, an end of the connecting portion 115 is turned over in an axial direction of the inner ring 12 and extends to an inner wall surface which is attached to the second inner opening end 123 to form the electrical contact portion 112, when the base 21 of the screw bulb 20 is connected to the inner ring 12, the base 21 is inserted into the inner ring 12, and an external thread of the base 21 abuts against the electrical contact portion 112, so that the screw bulb 20 is electrically connected to the conductive outer ring 11.

Further, in the present embodiment, as shown in fig. 2 and fig. 7, the position of the inner ring 12 between the electrical contact portion 112 and the first inner opening end 122 is suitable for being connected with the lamp head 21 of the screw bulb 20 through a threaded interference fit, that is, the inner diameter of the position of the inner ring 12 between the electrical contact portion 112 and the first inner opening end 122 is slightly smaller than the outer diameter of the lamp head 21 of the screw bulb 20, the lamp head 21 is inserted into the inner ring 12 and is connected with the inner ring 12 through the interference fit, and in the present embodiment, the rotational friction force existing between the inner ring 12 and the lamp head 21 due to the interference fit connection is larger than the rotational friction force between the conductive outer ring 11 and the screw socket, so as to ensure that the lamp head adapter 10 of the present embodiment can be taken out along with the screw bulb 20 when the screw bulb 20 and the screw socket are separated by rotation.

In another embodiment of the present invention, as shown in fig. 2 and 3, the end surface of the first inner open end 122 is folded outward along the radial direction of the inner ring 12 to form a rim 124, and the end surface of the first outer open end 113 abuts against the rim 124. That is, the first inner open end 122 of the inner ring 12 has a rim 124 extending to the end surface of the first outer open end 113 of the conductive outer ring 11, and the rim 124 is adapted to shield the first outer open end 113 of the conductive outer ring 11, so as to protect the conductive outer ring 11; in addition, the edge 124 is disposed to overlap the end surface of the first outer opening 113 of the conductive outer ring 11, and also can limit the installation of the inner ring 12, thereby preventing the inner ring 12 from moving downward in the conductive outer ring 11.

In another embodiment of the present invention, as shown in fig. 2, 3 and 7, a step portion 125 is further formed at a position where the inner annular sleeve 12 is connected to the rim portion 124, and a position of the inner annular sleeve 12 between the electrical contact portion 112 and the step portion 125 is suitable for being connected to the lamp head 21. Generally, as shown in fig. 9, a transition boss 22 is disposed at a position where the base 21 of the screw bulb 20 is connected to the lamp housing 23 for connecting the base 21, and an insulating ring 221 having a shape matched with the transition boss 22 is disposed around the transition boss 22, such as a rubber ring, a plastic ring, etc., for protecting the transition boss 22, so that the step 125 is disposed on the inner ring sleeve 12 for accommodating the transition boss 22 and the insulating ring 221, thereby ensuring that the base 21 of the screw bulb 20 can be fittingly sleeved in the inner ring sleeve 12.

In another embodiment of the present invention, as shown in fig. 3 and 7, the first inner opening end 122 is chamfered to form a guiding inclined plane 126, that is, a guiding inclined plane 126 having a ring shape and inclined toward the step portion 125 is formed at a position where the step portion 125 of the inner ring sleeve 12 is connected to the rim portion 124, and when the screw bulb 20 is connected, the base 21 of the screw bulb 20 may be inserted into the inner ring sleeve 12 along the guiding inclined plane 126.

In another embodiment of the present invention, as shown in fig. 2 and 3, the step portion 125 is provided with a recess 127 for inserting a detaching tool along the axial direction of the inner ring 12, specifically, the recess 127 is suitable for inserting an external rod-shaped detaching tool such as a screw driver, so that when the lamp head adapter 10 of the present embodiment is inadvertently separated from the lamp head 21 when taking out the screw bulb 20 and left in the screw socket, the lamp head adapter 10 can be inserted into the recess 127 by means of a tool such as a screw driver, and then the lamp head adapter 10 is driven to rotate by such a tool, so as to take out the lamp head adapter 10 from the screw socket, thereby preventing the lamp head adapter 10 of the present embodiment from being left in the screw socket due to being separated from the screw bulb 20.

It is understood that in some other embodiments, the recessed hole 127 may not be formed on the step portion 125 of the inner ring 12, so that when the lamp adapter 10 is separated from the screw bulb 20 and is retained in the screw socket, the lamp adapter 10 may be removed by other external tools such as a tool with an expansion head.

In another embodiment of the present invention, as shown in fig. 2 and 7, the internal thread 121 is disposed at the portion where the internal ring 12 and the lamp head 21 are connected in a matching manner, and when the lamp head 21 of the screw bulb 20 is inserted into the internal ring 12 in an interference fit manner, the internal thread 121 presses the side wall of the lamp head 21, so as to further improve the connection reliability between the internal ring 12 and the lamp head 21. Preferably, in this embodiment, the internal thread 121 is adapted to an external thread on the base 21 of the screw bulb 20.

In another embodiment of the present invention, the inner annular sleeve 12 is made of elastic rubber or plastic material, or the inner annular sleeve 12 can be made of rigid rubber or plastic material. Preferably, in this embodiment, the inner annular sleeve 12 is made of an elastic rubber or plastic material, so that the inner annular sleeve 12 has a certain elasticity, and when the inner annular sleeve 12 is connected with the lamp head 21 of the screw bulb 20 in an interference fit manner, the inner annular sleeve 12 can better bear the compressive stress applied by the lamp head 21, and reduce the damage of friction to the inner annular sleeve 12 and the lamp head 21.

In another embodiment of the present invention, the inner ring 12 is an integrally formed structure using the conductive outer ring 11 as an insert, i.e. the inner ring 12 and the outer ring are integrally formed, so that the connection between the inner ring 12 and the conductive outer ring 11 is more stable and reliable, and the inner ring 12 and the conductive outer ring 11 are effectively prevented from being separated during the use, thereby improving the structural stability of the lamp adapter 10 itself of this embodiment.

Further, in this embodiment, when the conductive outer ring sleeve 11 is a metal sleeve and the inner ring sleeve 12 is a rubber or plastic sleeve, the conductive outer ring sleeve 11 and the inner ring sleeve 12 are preferably integrally injection molded, i.e., a metal insert injection molding process, and a complex and delicate metal-plastic integrated product can be firmly manufactured by using the combination of formability, flexibility and rigidity, strength and heat resistance of rubber and plastic materials, so as to meet the requirement of material selection for manufacturing the lamp adapter 10 of this embodiment; in addition, the integral injection molding can well combine the insulation property of the plastic material and the electrical conductivity of the metal, so that the manufactured lamp cap adapter 10 can meet the basic electrical property of the electrical product. Like this, adopt integrative injection moulding technology to produce lamp holder adapter 10 of this embodiment, it only needs design dedicated mould, alright produce the lamp holder adapter 10 that satisfies the use needs, can make full use of ripe mould production technology, produce the lamp holder adapter 10 that satisfies various specification conversion needs, be favorable to saving the cost, improve production efficiency.

Another embodiment of the present invention further provides a lamp, as shown in fig. 8 to 10, the lamp includes a screw socket, a screw bulb 20 and the lamp adapter 10 mentioned in the above embodiments, the screw socket is connected with the external thread 111 on the conductive outer ring sleeve 11 of the lamp adapter 10 in a matching manner; the lamp cap 21 of the screw bulb 20 is connected with the inner ring 12 of the lamp cap adapter 10 in a matching way.

Specifically, as shown in fig. 8 to 10, in the lamp of the present embodiment, when in use, the lamp head 21 of the screw bulb 20 is inserted into the inner ring 12, the lamp head 21 of the screw bulb 20 is connected with the inner ring 12 in an interference fit manner, so that the lamp head 21 is tightly fitted and connected into the inner ring 12, at this time, the lamp head adapter 10 and the screw bulb 20 form a whole, the external thread 111 of the lamp head 21 is tightly attached to the electrical contact portion 112 of the conductive outer ring 11, so that the lamp head 21 is electrically conducted with the conductive outer ring 11, and then the conductive outer ring 11 is screwed into the screw socket, so that the screw bulb 20 can be stably installed into the screw socket and can be electrically conducted with the screw socket through the conductive outer ring 11.

The lamp that this embodiment provided, its screw bulb 20 passes through lamp holder adapter 10 and is connected with the screw socket for the screw bulb 20 of small dimension can correspond and install in the screw socket that big specification screw bulb 20 corresponds, the screw bulb 20 of small dimension can be sold with the screw socket of big specification together packing, and the unable cooperation condition of using of screw bulb 20 and screw socket can not exist, the screw bulb 20 is higher with the adaptation flexibility ratio of screw socket, it is more convenient to use.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A lamp cap adapter (10) comprising:

the conductive outer ring sleeve (11) is provided with an external thread (111) on the outer wall surface;

the insulated inner ring sleeve (12) is embedded in the conductive outer ring sleeve (11) and is used for being matched with a lamp holder (21) of the screw bulb (20);

the conductive outer ring sleeve (11) is provided with an electric contact part (112) extending to the inner part of the inner ring sleeve (12), and the lamp holder (21) is electrically connected with the conductive outer ring sleeve (11) through the electric contact part (112).

2. The cap adapter (10) according to claim 1, wherein: the conductive outer ring sleeve (11) is provided with a first outer opening end (113) and a second outer opening end (114) which are oppositely arranged and used for the lamp holder (21) to sequentially penetrate through, the inner ring sleeve (12) is provided with a first inner opening end (122) and a second inner opening end (123) which are oppositely arranged, the end part of the second outer opening end (114) is turned towards the inner ring sleeve (12) to form a connecting part (115), the end part of the connecting part (115) is turned along the axial direction of the inner ring sleeve (12) and extends to the inner wall surface of the second inner opening end (123) in a fit mode to form the electric contact part (112), and the position, between the electric contact part (112) and the first inner opening end (122), of the inner ring sleeve (12) is suitable for being in interference fit connection with the lamp holder (21) through threads.

3. The cap adapter (10) according to claim 2, wherein: the end surface of the first inner opening end (122) is folded outwards along the radial direction of the inner ring sleeve (12) to form a rim part (124), and the end surface of the first outer opening end (113) is abutted against the rim part (124).

4. A cap adapter (10) according to claim 3, wherein: a step part (125) is further formed at the position where the inner ring sleeve (12) is connected with the edge part (124), and the position, between the electric contact part (112) and the step part (125), of the inner ring sleeve (12) is suitable for being matched and connected with the lamp cap (21).

5. A cap adapter (10) according to claim 3, wherein: the first inner open end (122) is chamfered to form a guide ramp (126).

6. The cap adapter (10) according to claim 4, wherein: the step part (125) is provided with a concave hole (127) for inserting a disassembling tool along the axial direction of the inner ring sleeve (12).

7. A lamp cap adapter (10) according to any one of claims 1 to 6, wherein: the inner ring sleeve (12) is provided with an internal thread (121) at the part where the lamp holder (21) is matched and connected.

8. A lamp cap adapter (10) according to any one of claims 1 to 6, wherein: the inner annular sleeve (12) is made of elastic or rigid rubber or plastic material.

9. A lamp cap adapter (10) according to any one of claims 1 to 6, wherein: the inner ring sleeve (12) is an integrally formed structure taking the conductive outer ring sleeve (11) as an insert.

10. A lamp comprising a screw socket, a screw bulb (20) and a cap adapter (10) according to any one of claims 1 to 9, the screw socket being in mating connection with the external thread (111) of the cap adapter (10); the lamp holder (21) of the screw lamp bulb (20) is connected with the inner ring sleeve (12) of the lamp holder adapter (10) in a matching mode.

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