CN220731411U - PTC temperature limiter with circular ring type mounting structure - Google Patents

Abstract

The utility model relates to the field of temperature limiters, in particular to a PTC temperature limiter with a circular ring type mounting structure, which comprises: the PTC heating element comprises a fixed contact piece, a fixed contact, a connecting terminal, a moving contact, a bimetallic strip, an insulating support piece and a PTC heating piece; wherein the PTC heating element is sleeved outside the insulating support element; the upper end of the PTC heating element is electrically connected with the fixed contact piece; the lower end of the PTC heating element is in contact connection with the connecting terminal; the PTC temperature limiter is of an open structure, and the installation structure of the PTC heating element is ingenious, so that the PTC temperature limiter is more convenient to produce and install; the bimetallic strip in the PTC temperature limiter is electrified, the temperature sensing is sensitive, the temperature control precision is high, the PTC heating element is close to the bimetal, the heating speed is higher, the temperature is more stable, and the performance is more reliable; the PTC temperature limiter can be widely applied to household electrical appliance products such as electric hair dryers, warm air blowers, beauty devices, lamps, toilet covers and the like.

Description

PTC temperature limiter with circular ring type mounting structure

Technical Field

The utility model relates to the field of temperature limiters, in particular to a PTC temperature limiter with a circular ring type mounting structure.

Background

The traditional temperature-regulating rod loop is internally provided with a temperature fuse, when the temperature of the product is too high or the temperature controller of the main temperature regulator fails to cause the product to reach a certain temperature, the temperature fuse in the temperature-regulating rod loop is automatically fused, so that the circuit of the product is broken, and the safety protection function of preventing fire is achieved. However, although the temperature fuse in the temperature regulating rod is fused, the temperature regulating rod power plug is also arranged on the power socket, if the environmental temperature of the temperature regulating rod is abnormal to a certain extent, the fused 'temperature fuse' is possibly conducted again, so that potential safety hazards are caused; and the temperature regulating rod with the fused temperature fuse cannot be reused, and the product needs to be taken to a specific after-sales center or is processed by a professional, which is time-consuming and labor-consuming.

With the technical development, the PTC technology is applied to the temperature limiter, and compared with the traditional temperature fuse technology, the temperature limiter with the PTC technology has higher sensitivity and longer service life; for example, the chinese patent application No. 201020290836.7 proposes a PTC manual intervention reset temperature limiting type temperature controller, which needs to redesign the structure of the temperature limiter, and has a complex structural design, resulting in greatly improved production, assembly, installation and maintenance costs of the temperature limiter, and thus, the temperature limiter cannot be widely applied rapidly.

Disclosure of Invention

Aiming at the defects, the utility model aims to provide the PTC temperature limiter with the circular ring type mounting structure, which can be directly obtained by improving the existing shrapnel contact switch, and has the advantages of simple mounting structure of PTC, and greatly reduced production, assembly, installation and maintenance costs.

To achieve the purpose, the utility model adopts the following technical scheme:

a PTC temperature limiter with a circular ring mounting structure, comprising: the PTC heating element comprises a fixed contact piece, a fixed contact, a connecting terminal, a moving contact, a bimetallic strip, an insulating support piece and a PTC heating piece; the fixed contact is fixedly arranged on the fixed contact piece; the lower end of the bimetallic strip is fixedly arranged on the connecting terminal through a rivet, and the upper end of the bimetallic strip is fixedly arranged with the moving contact; one end of the insulating support piece is fixedly connected with the fixed contact piece, and the other end of the insulating support piece is fixedly connected with the connecting terminal, so that the fixed contact piece is not in direct contact with the connecting terminal; the PTC heating element is sleeved outside the insulating support element; the upper end of the PTC heating element is electrically connected with the fixed contact piece; the lower end of the PTC heating element is in contact connection with the connecting terminal; in a set temperature range, the moving contact and the fixed contact are kept in a contact state under the elastic action of the bimetallic strip; when the temperature of the bimetallic strip is higher than a set temperature range, the moving contact and the fixed contact are kept in a separated state under the elastic action of the bimetallic strip.

Preferably, the cross section of the PTC heating element is annular, and the PTC heating element is sleeved outside the insulating support element near the lower end of the bimetallic strip.

Preferably, a conductive elastic sheet is arranged between the upper end of the PTC heating element and the bottom of the fixed contact piece, and the lower end of the PTC heating element is tightly attached to the top surface of the connecting end.

Preferably, the insulating support is a ceramic post; the left end and the right end of the fixed contact piece and the left end and the right end of the connecting terminal are vertically provided with mounting holes; the ceramic column is provided with two mounting holes at the same end, the ceramic column is vertically arranged at the left end and the right end of the PTC temperature limiter respectively, the upper end of the ceramic column is vertically and fixedly arranged in the mounting holes of the fixed contact, and the lower end of the ceramic column is vertically and fixedly arranged in the mounting holes of the connecting terminals.

Preferably, the bottom of the fixed contact piece is provided with at least one pair of clamping pieces downwards, the upper ends of the clamping pieces are connected to the bottom of the fixed contact piece, and the lower ends of the clamping pieces extend towards the PTC heating piece and are abutted to the outer wall of the PTC heating piece.

Preferably, the bimetallic strip consists of an upper layer and a lower layer of metal sheet layers made of different materials; in a set temperature range, the bimetallic strip keeps an upward curved arc shape; when the temperature rises and exceeds the set range, the bimetallic strip bends downwards to form a straight line or an arc.

Preferably, the PTC heating element is a high-resistance semiconductor material having a positive temperature coefficient of resistance; the fixed contact piece, the connecting terminal, the bimetallic strip and the buckle piece are made of stainless steel or copper; the fixed contact is made of a copper-silver composite material, and the movable contact is made of a copper-silver composite material.

The embodiment of the utility model has the beneficial effects that:

the PTC temperature limiter can be directly improved on the existing spring contact switch, the PTC heating element is installed by adopting a circular ring sleeved structure, the structure is simple, the installation structure of the PTC heating element is ingenious, and the PTC heating element with corresponding parameters can be replaced according to the temperature control range and sensitivity, so that the production, installation and debugging operations of the PTC temperature limiter are more convenient and quicker; the bimetallic strip in the PTC temperature limiter is electrified, the temperature sensing is sensitive, the temperature control precision is high, the PTC heating element is close to the bimetal, the heating speed is higher, the temperature is more stable, and the performance is more reliable; the PTC temperature limiter can be widely applied to household electrical appliance products such as electric hair dryers, warm air blowers, beauty devices, lamps, toilet covers and the like.

Drawings

FIG. 1 is a schematic top view of one embodiment of the present utility model;

FIG. 2 is a schematic cross-sectional view of the embodiment of FIG. 1 taken along the A-A plane;

fig. 3 is an exploded view of the embodiment of fig. 1.

Wherein: the fixed contact 100, the fixed contact 120, the conductive spring 130,

the device comprises a connection terminal 200, a movable contact 210, a bimetallic strip 220, a rivet 230, an insulating support 240, a PTC heating element 250 and a mounting hole 260.

Detailed Description

The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.

As shown in fig. 1 to 3, one embodiment of the present application is a PTC temperature limiter having a circular ring type mounting structure, comprising: the fixed contact 100, the fixed contact 120, the connection terminal 200, the moving contact 210, the bimetal 220, the insulating support 240, and the PTC heating member 250; the fixed contact 120 is fixedly mounted on the fixed contact 100; the lower end of the bimetal 220 is fixedly mounted on the connection terminal 200 by a rivet 230, and the upper end of the bimetal is fixedly mounted on the movable contact 210; one end of the insulating support 240 is fixedly connected with the fixed contact 100, and the other end of the insulating support 240 is fixedly connected with the connection terminal 200, so that the fixed contact 100 and the connection terminal 200 are not in direct contact; the PTC heating member 250 is sleeved outside the insulating support 240; the upper end of the PTC heating member 250 is electrically connected with the stationary contact 100; the lower end of the PTC heating member 250 is connected to the connection terminal 200 in contact; in a set temperature range, the moving contact 210 and the fixed contact 120 maintain a contact state under the elastic action of the bimetal 220; when the temperature of the bimetal 220 is higher than the set temperature range, the moving contact 210 and the fixed contact 120 are kept in a separated state by the elastic action of the bimetal 220.

Specifically, the cross section of the PTC heating element 250 is annular, and the PTC heating element 250 is sleeved outside the insulating support 240 near the lower end of the bimetal 220. The PTC heating member 250 is designed in such a shape, which greatly simplifies the installation of the PTC heating member 250 and also makes the PTC stopper simple and stable in structure. The PTC heating element 250 may be vertically and quickly sleeved and mounted outside the insulating support 240, i.e. may be stably and vertically mounted between the fixed contact 100 and the connection terminal 200, the upper end of the PTC heating element 250 is electrically connected with the fixed contact 100, and the lower end of the PTC heating element 250 is in contact connection with the connection terminal 200, thereby forming a high-resistance branch circuit structure; the PTC heating element 250 is disposed in contact with the connection terminal 200, and the PTC heating element 250 is disposed near the bimetal 220, so that when the PTC heating element 250 heats, the temperature can be rapidly transferred to the bimetal 220, so that the temperature of the bimetal 220 is sensed more rapidly.

Specifically, a conductive elastic sheet 130 is disposed between the upper end of the PTC heating element 250 and the bottom of the fixed contact 100, and the lower end of the PTC heating element 250 is tightly attached to the top surface of the connection end. The conductive elastic sheet 130 can utilize its structure to make the upper end of the PTC heating element 250 electrically connected with the fixed contact 100, and in addition, the conductive elastic sheet 130 can utilize its elasticity to press the PTC heating element 250 down on the top surface of the connection end, thereby not only ensuring the conductive installation requirement of the PTC heating element 250, but also ensuring the firmness of the installation structure.

Specifically, the insulating support 240 is a ceramic column; mounting holes 260 are vertically formed at the left and right ends of the fixed contact 100 and the left and right ends of the connection terminal 200; the fixed contact 100 and the connecting terminal 200 are arranged in parallel, two mounting holes 260 at the same end are vertically opposite to each other, two ceramic columns are arranged and are vertically arranged at the left end and the right end of the PTC temperature limiter respectively, the upper ends of the ceramic columns are vertically and fixedly arranged in the mounting holes 260 of the fixed contact 100, and the lower ends of the ceramic columns are vertically and fixedly arranged in the mounting holes 260 of the connecting terminal 200. The ceramic column is an insulating member with supporting property, which can firmly support the left end and the right end of the fixed contact 100 and the connecting terminal 200, so that the fixed contact 100 and the connecting terminal are arranged up and down in parallel, and the structural stability of the PTC temperature limiter can be maintained.

Specifically, at least one pair of clamping pieces is disposed downward at the bottom of the fixed contact 100, the upper ends of the clamping pieces are connected to the bottom of the fixed contact 100, and the lower ends of the clamping pieces extend toward the PTC heating piece 250 and are abutted against the outer wall of the PTC heating piece 250. The pair of clamping pieces stably supports and presses the two side surfaces of the PTC heating piece 250, so that the PTC heating piece 250 is completely abutted and fastened by the pair of clamping pieces and the elastic card in the horizontal plane direction, and the PTC heating piece 250 and the fixed contact 100 have better electrical connectivity and more firm mounting structure.

Specifically, the bimetal 220 is composed of an upper layer and a lower layer of metal sheet layers made of different materials; in a set temperature range, the bimetal 220 maintains an upwardly curved arc shape; when the temperature rises and exceeds the set range, the bimetal 220 is bent downward in a straight line or an arc shape. The PTC heating element is made of a high-resistance semiconductor material with positive resistance temperature coefficient; the fixed contact piece 100, the connecting terminal 200, the bimetallic strip 220 and the buckle piece are made of stainless steel or copper; the fixed contact 120 is made of a copper-silver composite material, and the movable contact 210 is made of a copper-silver composite material.

The PTC temperature limiter works; initially, the fixed contact 120 and the moving contact 210 are kept in a contact closed state under the elastic action of the bimetal 220, and at this time, the fixed contact 100, the fixed contact 120, the bimetal 220 and the connection terminal 200 form a bottom resistance branch circuit structure, and since the resistance of the low resistance branch is much smaller than that of the high resistance branch, the bimetal 220 is not deformed in a set temperature range, the voltage at both ends of the PTC heating element 250 is extremely small, and the PTC heating element 250 does not work; when the bimetal 220 increases with the temperature of the working environment, the bimetal 220 bends downward to form a straight line or an arc shape, and the bending action makes the fixed contact 120 and the moving contact 210 open, and at the same time, under the condition that a certain voltage is maintained between the connecting terminal and the fixed contact 100, the PTC heating member 250 heats up due to the voltage at the two ends of the PTC heating member to increase to the working voltage, the PTC heating member 250 heats up, so that the temperature of the bimetal 220 is always maintained above the reset temperature and is not reset, and the fixed contact 120 and the moving contact 210 also maintain the open state; only when the power is cut off, the voltage between the connecting terminal and the fixed contact 100 is reduced, the PTC heating member 250 does not work, and the fixed contact 120 and the movable contact 210 are reset and are restored to the normally-contacted closed state.

The PTC temperature limiter can be directly improved on the existing spring contact switch, is simple in structure and is of an open structure, the installation structure of the PTC heating element 250 is ingenious, and the PTC heating element 250 with corresponding parameters can be replaced according to the temperature control range and sensitivity, so that the production, installation and debugging operations of the PTC temperature limiter are more convenient and faster; the bimetallic strip 220 in the PTC temperature limiter is electrified, the temperature sensing is sensitive, the temperature control precision is high, the PTC heating element 250 is close to bimetal, the heating speed is higher, the temperature is more stable, and the performance is more reliable; the PTC temperature limiter can be widely applied to household electrical appliance products such as electric hair dryers, warm air blowers, beauty devices, lamps, toilet covers and the like.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The technical principle of the present utility model is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the utility model and should not be taken in any way as limiting the scope of the utility model. Other embodiments of the utility model will be apparent to those skilled in the art from consideration of this specification without undue burden.

Claims (7)

1. A PTC temperature limiter having a circular ring type mounting structure, comprising: the PTC heating element comprises a fixed contact piece, a fixed contact, a connecting terminal, a moving contact, a bimetallic strip, an insulating support piece and a PTC heating piece;

the fixed contact is fixedly arranged on the fixed contact piece;

the lower end of the bimetallic strip is fixedly arranged on the connecting terminal through a rivet, and the upper end of the bimetallic strip is fixedly arranged with the moving contact;

one end of the insulating support piece is fixedly connected with the fixed contact piece, and the other end of the insulating support piece is fixedly connected with the connecting terminal, so that the fixed contact piece is not in direct contact with the connecting terminal;

the PTC heating element is sleeved outside the insulating support element;

the upper end of the PTC heating element is electrically connected with the fixed contact piece; the lower end of the PTC heating element is in contact connection with the connecting terminal;

in a set temperature range, the moving contact and the fixed contact are kept in a contact state under the elastic action of the bimetallic strip; when the temperature of the bimetallic strip is higher than a set temperature range, the moving contact and the fixed contact are kept in a separated state under the elastic action of the bimetallic strip.

2. A PTC temperature limiter according to claim 1, wherein the PTC heating member has a circular cross section, and is fitted around the outside of the insulating support member near the lower end of the bimetal.

3. The PTC temperature limiter with the circular ring type mounting structure according to claim 2, wherein a conductive spring sheet is arranged between the upper end of the PTC heating element and the bottom of the fixed contact sheet, and the lower end of the PTC heating element is tightly attached to the top surface of the connecting end.

4. A PTC temperature limiter according to claim 1, wherein the insulating support is a ceramic post; the left end and the right end of the fixed contact piece and the left end and the right end of the connecting terminal are vertically provided with mounting holes;

the ceramic column is provided with two mounting holes at the same end, the ceramic column is vertically arranged at the left end and the right end of the PTC temperature limiter respectively, the upper end of the ceramic column is vertically and fixedly arranged in the mounting holes of the fixed contact, and the lower end of the ceramic column is vertically and fixedly arranged in the mounting holes of the connecting terminals.

5. A PTC temperature limiter according to claim 3, wherein the bottom of the stationary contact is provided with at least one pair of clip members, the upper ends of the clip members are connected to the bottom of the stationary contact, and the lower ends of the clip members extend toward the PTC heating member and abut against the outer wall of the PTC heating member.

6. The PTC temperature limiter with the circular ring type mounting structure of claim 1, wherein the bimetal consists of an upper metal sheet layer and a lower metal sheet layer which are made of different materials; in a set temperature range, the bimetallic strip keeps an upward curved arc shape; when the temperature rises and exceeds the set range, the bimetallic strip bends downwards to form a straight line or an arc.

7. A PTC temperature limiter according to claim 1, wherein the PTC heating element is a high resistance semiconductor material having a positive temperature coefficient of resistance; the fixed contact piece, the connecting terminal, the bimetallic strip and the buckle piece are made of stainless steel or copper; the fixed contact is made of a copper-silver composite material, and the movable contact is made of a copper-silver composite material.