CN214960153U

CN214960153U - Ceramic PTC heater

Info

Publication number: CN214960153U
Application number: CN202121224317.5U
Authority: CN
Inventors: 徐小庆; 胡泽谋
Original assignee: Zhuhai Dongfang Electric Heating Technology Co ltd
Current assignee: Zhuhai Dongfang Electric Heating Technology Co ltd
Priority date: 2021-06-02
Filing date: 2021-06-02
Publication date: 2021-11-30
Anticipated expiration: 2031-06-02

Abstract

The present disclosure relates to a ceramic PTC heater comprising: the base is provided with an accommodating cavity; the heating tube is inserted into the accommodating cavity; the first mounting seat is arranged on the top surface of the base, a first mounting groove is formed in the middle of the first mounting seat, and a through hole is formed in the bottom of the first mounting groove; the thermal protector is matched with the first mounting groove, the bottom surface of the thermal protector extends downwards to form a connecting part, and the connecting part is movably arranged in the through hole in a penetrating manner; the elastic piece is sleeved outside the connecting part; the elastic lock catches are arranged at the upper end edge of the first mounting groove and are arranged in pairs and used for locking the thermal protector in the first mounting groove. This openly can effectively cushion the vibration that the hot protector receives, make the fixed firm, difficult aversion of hot protector, can effectively protect the inside circuit structure of hot protector simultaneously, make the hot protector play stable hot guard action, reduce the potential safety hazard, processing convenient assembling in addition, the dismouting of being convenient for.

Description

Ceramic PTC heater

Technical Field

The disclosure relates to the technical field of electric heaters, in particular to a ceramic PTC heater.

Background

The ceramic PTC heater (PTC heater for short) is composed of PTC ceramic heating elements and an aluminum pipe, has the advantages of low thermal resistance and high heat exchange efficiency, and is an automatic constant-temperature and electricity-saving electric heater. PTC heaters generally consist of a base, a heat pipe, a thermal protector, and an internal circuit structure. The heating tube is inserted into the accommodating cavity of the base, and the circuit structure is used for electrifying the heating tube to ensure that the heating tube generates heat when being electrified. The thermal protector is also called an overheating protector, is generally arranged on the top surface of the base, is electrically connected with a circuit structure of the PCT heater, and is used for automatically powering off when the PCT heater is overheated so as to realize overheating protection.

The thermal protector is generally designed as a box-packed structure and is fixed on the top surface of the base through bolts. One main application environment of the PCT heater is in a warm air system of a vehicle, when the PCT heater is arranged in the vehicle, the thermal protector adopts the bolt fixing mode, and the thermal protector is prone to generate vibration due to bumping of the vehicle in the vehicle traveling process, so that bolts are gradually loosened, the thermal protector may be displaced due to the loosening of the bolts, the displacement of the thermal protector may cause inaccurate temperature detection, the thermal protection function of the thermal protector is lost, and the PCT heater may be operated in an overheat state, so that the PCT heater is damaged due to overheating, and certain potential safety hazards exist. Meanwhile, the vibration may affect the internal circuit structure of the sensing element of the thermal protector, and the like, and affect the precision of the thermal protector. In addition, the bolt fixing mode is relatively troublesome in processing and assembling, and the production efficiency of the PTC heater is affected.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems of the prior art as described above, the present disclosure is directed to providing a ceramic PTC heater. This openly can effectively cushion the vibration that the hot protector receives, make the fixed firm, difficult aversion of hot protector, can effectively protect the inside circuit structure of hot protector simultaneously, make the hot protector play stable hot guard action, reduce the potential safety hazard, processing convenient assembling in addition, the dismouting of being convenient for.

A ceramic PTC heater according to the present disclosure comprises:

the base is provided with an accommodating cavity for inserting the heating tube;

the heating tube is inserted into the accommodating cavity;

the heat protector comprises a base, a first mounting seat, a second mounting seat and a heat protector, wherein the first mounting seat is arranged on the top surface of the base, a first mounting groove for placing the heat protector is formed in the middle of the first mounting seat, and a through hole is formed in the bottom of the first mounting groove;

the thermal protector is matched with the first mounting groove, the bottom surface of the thermal protector extends downwards at a position corresponding to the through hole to form a connecting part matched with the through hole, and the connecting part is movably arranged in the through hole in a penetrating manner;

the elastic piece is sleeved outside the connecting part, one end of the elastic piece is connected with the bottom surface of the first mounting groove, and the other end of the elastic piece is connected with the bottom surface of the thermal protector;

and the elastic lock catches are arranged at the upper end edge of the first mounting groove and are arranged in pairs, and the thermal protector lock catches are arranged in the first mounting groove.

Preferably, the ceramic PTC heater further comprises:

the second mounting seat is arranged on the side surface of the base, and a second mounting groove for placing the overcurrent protector is formed in the middle of the second mounting seat;

and the overcurrent protector is arranged in the second mounting groove.

Preferably, first connection holes are formed at both sides of the second mounting seat; the both sides of overcurrent protector outwards extend and form outer edge, be formed with on the outer edge with the second connecting hole of first connecting hole looks adaptation, ceramic PTC heater still includes:

and the connecting piece penetrates through the first connecting hole and the second connecting hole to connect the overcurrent protector with the second mounting seat.

Preferably, the ceramic PTC heater further comprises:

the gasket is made of elastic materials and sleeved outside the connecting piece and positioned close to the end part of the connecting piece.

Preferably, the ceramic PTC heater further comprises:

the movable sealing cover is arranged beside the second mounting seat, one end of the movable sealing cover is hinged with the second mounting seat, and the other end of the movable sealing cover is detachably connected with the second mounting seat.

Preferably, the ceramic PTC heater further comprises:

a controller for controlling the operation of the ceramic PTC heater;

the first microswitch is arranged at the bottom of the first mounting groove and is electrically connected with the controller.

Preferably, the ceramic PTC heater further comprises:

and the second microswitch is arranged at the bottom of the second mounting groove and is electrically connected with the controller.

Preferably, the elastic member is a spring.

The utility model discloses a pottery PTC heater, its advantage lies in, this disclosure is through the cooperation of connecting portion and through-hole, sliding connection about messenger's heat protector and first mount pad, and establish the elastic component at the outside cover of connecting portion, make and have elasticity between heat protector and the first mount pad, press down heat protector through the elasticity hasp at last, with heat protector hasp in first mounting groove, the locking force is applyed downwards to the elasticity hasp, the locking force acts on heat protector, push down heat protector and then make the elastic component compression produce ascending elasticity, form the power balance between locking force and the elasticity, make heat protector keep fixed. When the PTC heater receives the vibration, the motion trend that the thermal protector rocked from top to bottom is cushioned by the elastic component, the elastic component plays good buffering damping effect, the problem that bolted connection's mode is easily not hard up by the vibration is solved, the thermal protector aversion can be effectively prevented, the vibration that the internal circuit structure of thermal protector receives also can be reduced, protect the internal circuit structure of thermal protector, make the thermal protector can play stable thermal protection effect, the risk of PTC heater overheat running has effectively been reduced, the potential safety hazard is reduced. Meanwhile, the elastic lock catch is matched with the elastic piece to fix the structure of the thermal protector, so that the thermal protector can be stably fixed, and the thermal protector is convenient to process, assemble and disassemble.

Drawings

Fig. 1 is a top view of a ceramic PTC heater according to the present disclosure;

FIG. 2 is a schematic view of a mounting structure of the thermal protector of the present disclosure;

fig. 3 is a side view of a ceramic PTC heater according to the present disclosure;

fig. 4 is a schematic view of an installation structure of the overcurrent protector disclosed by the disclosure.

Description of reference numerals: 10-base, 101-containing cavity, 20-heating pipe, 30-first mounting seat, 301-first mounting groove, 3011-through hole, 40-thermal protector, 401-connecting part, 50-elastic part, 60-elastic lock catch, 70-second mounting seat, 701-second mounting groove, 80-overcurrent protector, 801-outer edge, 90-connecting part and 100-gasket.

Detailed Description

As shown in fig. 1 to 4, a ceramic PTC heater (hereinafter, referred to as a PTC heater) according to the present disclosure includes:

the base 10 is made of high-temperature-resistant plastic, and the base 10 is approximately of a boss structure and comprises a top surface and a bottom surface which are parallel relatively, a left side surface inclined to the bottom surface and a right side surface perpendicular to the bottom surface. The left end of the base 10 is formed with a receiving cavity 101 for inserting the heat generating tube 20. The PTC heater also generally includes a corresponding circuit structure, which is disposed inside the base 10, electrically connected to the heating tube 20, and used for energizing the heating tube 20 to generate heat, and controlling the start/stop and heating power of the heating tube 20.

The heating tube 20 is arranged in the accommodating cavity 101 at the left end of the base 10, and is used for heating when being electrified.

The first mounting seat 30 is a square seat-shaped structure as a whole, and the first mounting seat 30 is usually integrated with the base 10 to avoid the defect that the connection position is easy to loose. A first mounting groove 301 for placing the thermal protector 40 is formed in the middle of the first mounting seat 30, the first mounting groove 301 penetrates left and right (taking the direction shown in fig. 1 as an example), the width of the first mounting groove 301 is slightly larger than the width of the thermal protector 40, and a through hole 3011 penetrating through the bottom of the first mounting groove 301 is formed.

The thermal protector 40 is generally configured as a box structure, relays such as a thermal sensing element and a switching element are integrated in the thermal protector 40, the thermal sensing element is electrically connected with the switching element through a commonly-used overheat protection circuit, and then the thermal protector 40 is electrically connected with the circuit structure of the PTC heater, so that when the sensing temperature of the thermal sensing element is greater than a preset threshold value, the PTC heater can be cut off through the switching element, and overheat protection is realized. In some applications where the accuracy requirement is not high, the thermal protector 40 may also employ a thermistor as the primary thermal sensing element. The thermal protector 40 is arranged in the first mounting groove 301 and is in sliding fit with the first mounting groove 301, a cylindrical connecting portion 401 matched with the through hole 3011 is formed by extending the bottom surface of the thermal protector 40 downwards at a position corresponding to the through hole 3011, the connecting portion 401 is in clearance fit with the through hole 3011, the connecting portion 401 is arranged in the through hole 3011 in a penetrating mode, and the thermal protector 40 can slide up and down in the first mounting groove 301.

The elastic element 50 is sleeved outside the connecting part 401, one end of the elastic element 50 is connected with the bottom surface of the first mounting groove 301, and the other end of the elastic element 50 is connected with the bottom surface of the thermal protector 40, so that the thermal protector 40 is under the elastic action of the elastic element 50 in the process of sliding up and down.

At least a pair of elastic latches 60, the elastic latches 60 are disposed at the upper edge of the first mounting groove 301 and are disposed in pairs, the elastic latches 60 are commonly used in the market, when the movable end of the elastic latch 60 is latched downward, the spring inside the elastic latch 60 generates elastic force, so that the movable end generates downward pressure to press the thermal protector 40 in the first mounting groove 301.

This is disclosed through the cooperation of connecting portion 401 and through-hole 3011, make thermal protector 40 and first mount pad 30 upper and lower sliding connection, and establish elastic component 50 at the outside cover of connecting portion 401, make have elasticity between thermal protector 40 and the first mount pad 30, press down thermal protector 40 through elasticity hasp 60 at last, with thermal protector 40 hasp in first mounting groove 301, elasticity hasp 60 applys the locking force downwards, the locking force acts on thermal protector 40, push down thermal protector 40 and then make elastic component 50 compression produce ascending elasticity, form power balance between locking force and the elasticity, make thermal protector 40 keep fixed. When the PTC heater receives the vibration, the motion trend that heat protector 40 rocked from top to bottom is cushioned by elastic component 50, elastic component 50 plays good buffering damping effect, the problem that bolted connection's mode is easily not hard up by the vibration is solved, can prevent effectively that heat protector 40 from shifting, also can reduce the vibration that heat protector 40 internal circuit structure received, protect the inside circuit structure of heat protector 40, make heat protector 40 can play stable hot guard action, the risk of PTC heater overheat running has effectively been reduced, the potential safety hazard is reduced. Meanwhile, the elastic lock catch 60 is matched with the elastic piece 50 to fix the structure of the thermal protector 40, so that the thermal protector 40 can be stably fixed, and the thermal protector is convenient to process, assemble and disassemble.

Further, in this embodiment, the ceramic PTC heater further includes a second mounting seat 70, the second mounting seat 70 is similar to the first mounting seat 30 in structure and also has a square seat-shaped structure, and is disposed on the side surface of the base 10, a second mounting groove 701 penetrating left and right (taking the direction shown in fig. 3 as an example) is formed in the middle of the second mounting seat 70, and the width of the second mounting groove 701 is slightly larger than the width of the overcurrent protector 80, so as to accommodate the overcurrent protector 80.

The overcurrent protector 80 is generally designed into a square box-packed structure, a commonly-used overcurrent protection circuit is integrated in the overcurrent protector 80 and generally comprises a sampling detection circuit and a switch element, and the overcurrent protector 80 is electrically connected with the circuit structure of the ceramic PTC heater and is used for cutting off the circuit when the current in the circuit exceeds a preset threshold value so as to stop the operation of the ceramic PTC heater. When some ceramic PTC heaters with larger power operate, the internal current is larger, and the risk of overcurrent burnout is easy to appear, so that in the ceramic PTC heaters, the overcurrent protector 80 needs to be additionally arranged for overcurrent protection, and the structure can facilitate the assembly of the overcurrent protector 80.

Further, in this embodiment, referring to fig. 4 in detail, the overcurrent protector 80 is installed in the second installation groove 701, first connection holes (not numbered) are formed on two sides of the second installation groove 701, two sides of the overcurrent protector 80 extend outward to form an outer edge 801, a second connection hole having a diameter equal to that of the first connection hole is formed on the outer edge 801, the ceramic PTC heater further includes a connection member 90, more specifically, the connection member 90 is a hexagon screw, an internal thread is tapped inside the first connection hole, and the connection member 90 penetrates through the first connection hole and the second connection hole to connect the overcurrent protector 80 and the second installation seat 70. The connecting structure can ensure that the overcurrent protector 80 is stably installed and is convenient to assemble.

Further, in this embodiment, the ceramic PTC heater further includes a gasket 100, the gasket 100 is made of an elastic material such as rubber, and the gasket 100 is sleeved on the outer side of the connecting member 90 and is located at a position close to the end of the connecting member 90. The spacer is used to make the attachment 90 fit tightly and not prone to wobble.

Further, in this embodiment, the ceramic PTC heater further includes a movable cover (not shown), the movable cover is disposed beside the second mounting seat 70, one end of the movable cover is hinged to the second mounting seat 70, and the other end of the movable cover is detachably connected to the second mounting seat 70 through a buckle. In the actual production process, the base 10 is usually produced in batch, each component is assembled on the base 10 subsequently, for the ceramic PTC heater which does not need to be additionally provided with the overcurrent protector 80, the second mounting groove 701 is in an exposed state, and a certain number of wiring holes are reserved in the second mounting groove 701 for wiring generally, so that impurities such as external dust can enter the base 10 through the wiring holes to damage the internal circuit structure, and therefore by arranging the movable sealing cover, when the ceramic PTC heater of the type does not need to be additionally provided with the overcurrent protector 80, the movable sealing cover can be turned over to seal the second mounting groove 701, so that the dust is prevented from entering the base 10. In some preferred embodiments, the inner side edge of the removable cover is further attached with a rubber sealing strip to enhance the sealing performance of the removable cover.

Further, in this embodiment, the ceramic PTC heater further comprises:

the controller is one of the conventional accessories of the ceramic PTC heater, and generally adopts a single chip microcomputer for controlling the operation of the ceramic PTC heater, such as starting and stopping and power regulation.

A first micro switch (not shown in the figure) disposed at the bottom of the first mounting groove 301, i.e. between the first mounting groove 301 and the thermal protector 40, the first micro switch being electrically connected to the controller. The first micro switch is used for sensing the thermal protector 40, taking a ceramic PTC heater installed in a vehicle as an example, in the running process of the vehicle, the thermal protector 40 has the risk of coming off due to vibration, and after the thermal protector 40 comes off, the ceramic PTC heater can still run and is likely to run in an overheating way, so the first micro switch is arranged to sense the thermal protector 40, when the thermal protector 40 is out of position, the first micro switch has no sensing signal output, and the controller controls the ceramic PTC heater to stop running and simultaneously sends out an alarm signal. The first microswitch can effectively prevent the ceramic PTC heater from operating excessively, and further improves the safety of the ceramic PTC heater.

Further, in this embodiment, the ceramic PTC heater further includes a second micro switch disposed at the bottom of the second mounting groove 701, and the second micro switch is electrically connected to the controller. The second microswitch is used for sensing the over-current protector 80, and the principle and function thereof are similar to those of the first microswitch, and can be understood by referring to the above description, and are not described herein again. The second microswitch can effectively prevent the ceramic PTC heater from overcurrent operation, and further improves the safety of the ceramic PTC heater.

Further, in this embodiment, the elastic member 50 is a spring, which can provide stable elastic force, and is convenient to install and low in cost.

In the description of the present disclosure, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience in describing and simplifying the present disclosure, and in the absence of a contrary explanation, these directional terms are not intended to indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present disclosure.

Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present disclosure.

Claims

1. A ceramic PTC heater, characterized by comprising:

the heating tube is inserted into the accommodating cavity;

2. A ceramic PTC heater according to claim 1, further comprising:

and the overcurrent protector is arranged in the second mounting groove.

3. A ceramic PTC heater according to claim 2, wherein first connection holes are formed at both sides of the second mounting seat; the both sides of overcurrent protector outwards extend and form outer edge, be formed with on the outer edge with the second connecting hole of first connecting hole looks adaptation, ceramic PTC heater still includes:

4. A ceramic PTC heater according to claim 3, further comprising:

5. A ceramic PTC heater according to claim 2, further comprising:

6. A ceramic PTC heater according to claim 2, further comprising:

a controller for controlling the operation of the ceramic PTC heater;

7. A ceramic PTC heater according to claim 6, further comprising:

8. A ceramic PTC heater according to any of claims 1-7, wherein the elastic member is a spring.