CN212161696U - Canned type thermal protector that transships - Google Patents

Abstract

The utility model relates to a canned type overload heat protector, including base and the upper cover that the lid closed and form the seal on the base, the base includes bottom plate, liner, bimetallic strip, set up first guide pillar and second guide pillar on the bottom plate, set up the heat-generating body between first guide pillar and second guide pillar, first guide pillar and second guide pillar set up at the bottom plate both ends, the heat-generating body both ends weld with first guide pillar and second guide pillar, the upper cover bottom is equipped with the boss that is located first guide pillar top, be provided with fat point on the boss, fat point is equipped with the stationary contact who fixes on fat point; one end of the bimetallic strip is fixed at the top end of the second guide pillar through a gasket, the upper surface of the other end of the bimetallic strip is welded with a movable contact, and the movable contact is connected with a fixed contact. The utility model discloses integrate bimetallic strip and heat-generating body in an circular telegram return circuit, inside operable space is bigger, and heat-generating body resistance adjustable range is wider, and conduction heat rate is faster, and reset time is long, has more the safety in utilization.

Description

Canned type thermal protector that transships

Technical Field

The utility model relates to a canned type thermal protector that transships, the protection of temperature rise, overcurrent is crossed to all kinds of motors of its mainly used.

Background

The existing motor is generally provided with a thermal protector which is mainly used for over-temperature rise and over-current protection. When the motor is used, the thermal protector is tightly attached to the motor shell, when a large current flows through the motor, a heating element in the thermal protector instantly generates large heat to cause the bimetallic strip to bend and turn over, and the movable contact is disconnected, so that the protection effect of overload current is achieved; in addition, when the motor works for a long time due to some reason, the temperature of the motor shell is overhigh, and after heat generated by the heating element in the thermal protector is superposed, the bimetallic strip is heated, bent and overturned, the movable contact is disconnected, and the protection effect of overtemperature rise is achieved. The bimetallic strip which is bent and overturned due to overcurrent and over-temperature rise can automatically reset when the environment temperature is lower than the reset temperature set by the bimetallic strip, so that the thermal protector enters the working state again.

Fig. 1 is a totally enclosed protector widely used in the market, which is composed of a guide post 21, a glass insulator 22, a bottom plate 23, an upper cover 24, a heating element 25, a lining plate 26, a gasket 27, a bimetallic strip 28, a movable contact 291, a stationary contact 292, a contact sheet 30, a guide post 21, a ceramic lining 31 and the like, wherein the bottom plate component is formed by sintering the bottom plate 23, the guide post 21, the glass insulator 22 and the ceramic lining 31 at a high temperature; two ends of the heating element 25 are respectively welded with the bottom plate 23 and the guide post 21; the bimetallic strip component is formed by connecting a lining plate 26, a gasket 27, a bimetallic strip 28 and a movable contact 291, and then is welded with the upper cover 24; the stationary contact 292 is welded with the contact piece 30 and then welded with the guide post 21; and finally, the upper cover component and the bottom plate component are folded and are finally connected through seamless welding at the periphery, and the action temperature of the bimetallic strip is adjusted at the upper cover adjusting point, so that the totally-enclosed protector forms a power-on loop. Because of the particularity of the design of the protector with the structure, the inner space of the protector is small, the adjustable allowance of the resistance of the heating element is not large, the overload protection current of the protector is generally between 10 and 30A, the protection sensitivity of the current above 30A is poor, and the compressor motor cannot be effectively protected, so that the development of a thermal protector with a large overload protection current coverage range is urgently needed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a structural design more reasonable, the bigger canned type overload heat protector of overload protection electric current coverage.

The utility model provides a technical scheme that its technical problem adopted is:

the utility model provides a canned type overload thermal protector, includes that base and lid close the upper cover that forms sealedly on the base, and the base includes bottom plate, liner, bimetallic strip, sets up first guide pillar and second guide pillar on the bottom plate, sets up the heat-generating body between first guide pillar and second guide pillar, its characterized in that: the first guide post and the second guide post are respectively arranged at two ends of the bottom plate, and two ends of the heating body are respectively welded with the first guide post and the second guide post; the bottom of the upper cover is provided with a boss positioned above the first guide pillar, the boss is provided with a fat point, and the fat point is provided with a static contact fixed on the fat point; one end of the bimetallic strip is fixed at the top end of the second guide pillar through a gasket, the upper surface of the other end of the bimetallic strip is welded with a movable contact, and the movable contact is connected with a fixed contact.

Preferably, the bottom plate is provided with two round holes, a ceramic lining and a glass insulator are sleeved in each round hole, through holes matched with the first guide post and the second guide post are formed in the ceramic lining and the glass insulator, and the first guide post and the second guide post penetrate through the through holes to be respectively fixed with the ceramic lining and the glass insulator.

Preferably, the upper cover is provided with a connecting hole, and the connecting hole is connected with the static contact.

Preferably, the heating element may be a wire-wound coil type, a wire-wound flat plate type, or a strip flat plate type.

Preferably, the bottom plate and the upper cover are connected through seamless welding.

Compared with the prior art, the utility model, have following advantage and effect: the bimetallic strip and the heating element are integrated in an electrifying loop, the operable space in the bimetallic strip is larger, the heating element with larger capacity can be accommodated, the adjustable range of the resistance of the heating element is wider, and the applicable range of the protector is larger; the bimetallic strip and the heating element which are connected are faster in heat conduction, and meanwhile, the heating element is stronger in heat storage capacity when being electrified, so that the protector can obtain longer reset time, and the protector is safer when in use.

Drawings

FIG. 1 is a schematic cross-sectional view of a prior art;

FIG. 2 is an exploded view of the present invention;

FIG. 3 is a schematic cross-sectional view of the present invention;

fig. 4 is a schematic structural view of the bottom plate of the present invention;

FIG. 5 is a schematic structural view of the ceramic lining plate of the present invention;

FIG. 6 is a schematic structural view of the glass beads of the present invention;

fig. 7 is a schematic structural view of the upper cover of the present invention;

FIG. 8 is a schematic structural view of the bottom plate portion of the present invention;

FIG. 9 is a schematic structural view of a heating element according to the present invention;

fig. 10 is a bottom view of the upper cover portion of the present invention;

fig. 11 is a schematic structural view of the bimetal part of the present invention.

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. In the description of the present invention, it should be noted that the terms "in", "up", "down", "left", "right", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do 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 thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Examples are given.

As shown in fig. 2-6, the present embodiment includes a base and an upper cover 11 covering the base to form a seal. The base comprises a bottom plate 12, round holes 121 respectively located at the left part and the right part of the bottom plate 12 are formed in the bottom plate 12, a ceramic lining 13 located at the upper part and a glass insulator 14 located at the lower part are arranged in each round hole 121, and the ceramic lining 13 is clamped with the glass insulator 14 at the joint. The ceramic lining 13 and the glass insulator 14 are provided with through holes 15 connected with each other, wherein a first guide post 16 penetrating through the through hole 15 is arranged in one circular hole 121, and a second guide post 17 penetrating through the through hole 15 is arranged in the other circular hole 121. In this embodiment, the length of the first guide post 16 is greater than that of the second guide post 17, the first guide post 16, the ceramic lining 13 and the glass insulator 14 are fixed by high temperature sintering, and the second guide post 17 is similar.

As shown in FIG. 7, the bottom of the upper cover 11 is provided with an outwardly extending flange 111, the bottom plate 12 and the upper cover 11 are connected by seamless welding, and the flange 111 is connected with the upper surface of the bottom plate 12 to enlarge the connection area so as to ensure the tightness between the upper cover 11 and the bottom plate 12.

As shown in fig. 8-9, a heating element 18 is disposed between the first guide post 16 and the second guide post 17, welding ends 181 matched with the first guide post 16 and the second guide post 17 are disposed at two ends of the heating element 18, and the heating element 18 is welded to the first guide post 16 and the second guide post 17 through the welding ends 181. The heating element 18 may be one of a wire spiral type, a wire flat type, and a strip flat type, as necessary.

As shown in fig. 10, a boss 112 located above the first guide post 16 is provided at the bottom of the upper cover 11, a fat point 113 is provided on the boss 112, a stationary contact 191 is sleeved on the fat point 113, and after the operating temperature is finely adjusted by pressing down the boss 112 by a mechanical device, the operating temperature can be ensured to reach a specified value. In this embodiment, the stationary contact 191 and the fat point 113 are further welded to enhance the connection effect. The top surface of the upper cover 11 is provided with a connecting hole 114 positioned right above the stationary contact 191, the connecting hole 114 is connected with the stationary contact 191, and the connecting hole 114 is an input/output interface of the stationary contact 191.

As shown in fig. 11, the base further includes a bimetal 10, the bimetal 10 is located above the heating element 18, one end of the bimetal 10 is fixed on the top end of the second guide pillar 17 through a gasket 101, and the movable contact 192 located above the first guide pillar 16 is welded on the upper surface of the other end of the bimetal 10. In a normal state, the movable contact 192 is in contact with the stationary contact 191. Specifically, the sealed heat transfer protector includes a first guide post 16, a heating element 18, a second guide post 17, a gasket 101, a bimetallic strip 10, a movable contact 192, a fixed contact 191, and a connecting hole 114, which form an electrical circuit in the upper cover 11, wherein the first guide post 16 and the connecting hole 114 are used as input/output interfaces.

The closed type heat-carrying protector is arranged on a motor shell, and when the closed type heat-carrying protector works normally, the movable contact 192 is connected with the fixed contact 191, and an electrified loop is communicated; when the motor works, the temperature of the coil is overhigh due to certain reasons, heat is conducted into the protector, the bimetallic strip 10 is heated and bent, the movable contact 192 is separated from the fixed contact 191, and the power-on loop is disconnected; when the motor is abnormally operated, the passing current is increased, the heating element 18 generates a large amount of heat, the heat is conducted to the bimetallic strip 10 through the air and the gasket 101, the bimetallic strip 10 is heated and bent, the movable contact 192 is separated from the fixed contact 191, and the power-on loop is disconnected. Compared with the existing totally-enclosed protector, the sealed type overheating protector integrates the bimetallic strip 10 and the heating element 18 into a power-on loop, has larger internal operable space, can accommodate a larger heating element 18, namely the heating element 18 has wider resistance adjustable range, and has larger applicable range. In this embodiment, the heating element 18 is connected in the loop of the bimetallic strip 10, so that the heat transfer speed is higher, the acting speed of the protector is improved, and meanwhile, the heat storage capacity of the heating element 18 is stronger when the protector is electrified, so that the protector can obtain longer reset time and is safer when in use.

The above description in this specification is merely illustrative of the present invention. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims (5)

1. The utility model provides a canned type overload thermal protector, includes that base and lid close the upper cover that forms sealedly on the base, and the base includes bottom plate, liner, bimetallic strip, sets up first guide pillar and second guide pillar on the bottom plate, sets up the heat-generating body between first guide pillar and second guide pillar, its characterized in that: the first guide post and the second guide post are respectively arranged at two ends of the bottom plate, and two ends of the heating body are respectively welded with the first guide post and the second guide post;

the bottom of the upper cover is provided with a boss positioned above the first guide pillar, the boss is provided with a fat point, and the fat point is provided with a static contact fixed on the fat point; one end of the bimetallic strip is fixed at the top end of the second guide pillar through a gasket, the upper surface of the other end of the bimetallic strip is welded with a movable contact, and the movable contact is connected with a fixed contact.

2. The sealed overload thermal protector according to claim 1, wherein: the bottom plate is provided with two round holes, a ceramic gasket and a glass insulator are sleeved in each round hole, through holes matched with the first guide post and the second guide post are formed in the ceramic gasket and the glass insulator, and the first guide post and the second guide post penetrate through the through holes to be respectively fixed with the ceramic gasket and the glass insulator.

3. The sealed overload thermal protector according to claim 1, wherein: the upper cover is provided with a connecting hole, and the connecting hole is connected with the static contact.

4. The sealed overload thermal protector according to claim 1, wherein: the heating body is any one of a wire spiral type, a wire flat type and a strip flat type.

5. The sealed overload thermal protector according to claim 1, wherein: the bottom plate and the upper cover are connected in a seamless welding mode.

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