Fixing structure for thermosensitive element of fire temperature sensing alarm

Abstract

The utility model discloses a fire hazard temperature sensing alarm thermosensitive element fixing structure, which comprises a temperature sensing alarm base and a thermosensitive element, the temperature sensing alarm base is provided with an installation groove, the thermosensitive element is installed in the installation groove through four fixing structures, and the fixing structures are arranged in the installation groove. The fixing structures are annularly distributed in the mounting groove at equal intervals; the fixing structure comprises a groove, a spring, a ball and a rubber sleeve; the groove is formed in the mounting groove, and the spring is mounted in the groove. When the thermosensitive element is moved upwards, the thermosensitive element extends into the mounting groove in the temperature sensing alarm base, at the moment, the thermosensitive element is in contact with the rubber sleeve on the ball, the ball compresses the spring into the groove, on the contrary, through the elasticity of the spring, the ball drives the rubber sleeve to abut against the thermosensitive element, and the thermosensitive element is conveniently fixed to the temperature sensing alarm base; and the thermosensitive element is convenient to disassemble and overhaul.

Description

Technical Field

[0001] This patent relates to the technical field of thermal sensitive elements of temperature sensing alarms, specifically a fixing structure of thermal sensitive elements of fire temperature sensing alarms. Background Art

[0002] During a fire, the combustion of substances will generate a large amount of heat, which will cause the surrounding temperature to change. Fire temperature alarms work on this principle. They convert temperature changes into electrical signals to achieve alarm purposes. Depending on the different temperature parameters monitored, there are several types of temperature-sensitive fire detectors generally used in industrial and civil buildings, such as fixed temperature type, differential temperature type, and differential fixed temperature type. Therefore, a thermal element is installed inside the thermal alarm. However, the current method of fixing the thermal element of the fire temperature alarm is relatively cumbersome, which makes it inconvenient to install the thermal element inside the temperature alarm, and it is also inconvenient to disassemble and repair. Utility Model Content

[0003] The purpose of this patent is to provide a fixing structure for the thermal element of a fire temperature alarm.

[0004] To achieve the above objectives, this patent provides the following technical solutions: a fixing structure for a fire temperature alarm thermal element, comprising a temperature alarm base and a thermal element, wherein the temperature alarm base is provided with a mounting groove, and the thermal element is mounted in the mounting groove via a fixing structure, wherein the number of the fixing structures is four and the fixing structures are equidistantly distributed in a circular shape in the mounting groove;

[0005] The fixing structure includes a groove, a spring, a ball and a rubber sleeve;

[0006] The groove is opened in the installation groove, the spring is installed in the groove, the ball is installed on the spring, the rubber sleeve is installed on the ball, the thermal element is placed in the installation groove, and the rubber sleeve is tightly pressed against the thermal element.

[0007] Preferably, a protective structure is installed on the base of the temperature alarm, and the protective structure includes an internal threaded circular shell, a filter plate, a rubber ring and an external threaded circular shell;

[0008] The outer threaded round shell is mounted on the base of the temperature sensing alarm, the inner threaded round shell is sleeved on the outer threaded round shell, the rubber ring is mounted on the filter plate, and the rubber ring is inserted into the inner threaded round shell.

[0009] Preferably, the rubber sleeve is mounted on the ball via a clamping structure, the clamping structure is arranged corresponding to the rubber sleeve, and the clamping structure includes a clamping block, a clamping groove and an elastic member;

[0010] The clamping block is mounted on the rubber sleeve, the clamping slot is provided on the ball, the elastic member is mounted in the clamping block, the rubber sleeve is sleeved on the ball, and the clamping block is clamped in the clamping slot.

[0011] Preferably, the thermal element includes a thermistor, a sampling resistor, a threshold circuit and a bistable circuit;

[0012] The thermistor is electrically connected to the sampling resistor, the threshold circuit is electrically connected to the circuit of the thermistor and the sampling resistor, the threshold circuit is electrically connected to the bistable circuit, and the bistable circuit is electrically connected to the circuit of the thermistor and the sampling resistor.

[0013] Preferably, a wire hole is provided on the base of the temperature alarm, and the mounting groove is connected to the wire hole.

[0014] Preferably, the base of the temperature alarm is provided with mounting holes, the number of the mounting holes is four, and the mounting holes are distributed in a circular shape and at equal intervals on the base of the temperature alarm.

[0015] Compared with the existing technology, the beneficial effects of this patent are: the fixed structure of the thermal element of the fire temperature alarm has the following advantages compared with the traditional technology:

[0016] 1. The thermal element is inserted into the mounting groove on the base of the temperature alarm. At this time, the thermal element is in contact with the rubber sleeve on the ball, and the ball compresses the spring into the groove. Conversely, the elasticity of the spring causes the ball and the rubber sleeve to press against the thermal element, making it easier to fix the thermal element on the base of the temperature alarm. When the thermal element is moved up, it is easier to disassemble and repair the thermal element.

[0017] 2. Screw the internal threaded shell onto the external threaded shell. The thermal element enters the installation groove fixed on the base of the temperature alarm through the internal threaded shell. At this time, insert the filter plate with the rubber ring into the internal threaded shell. The filter plate can prevent dust from the thermal element. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the patent structure;

[0019] Figure 2 This is a schematic diagram of the structure of the cross-sectional view of this patent;

[0020] Figure 3 This is a schematic diagram of the structure of the card block, card slot and elastic member of this patent;

[0021] Figure 4 This is a schematic diagram of the structure of the thermistor, sampling resistor, threshold circuit and bistable circuit of this patent.

[0022] In the figure: 1. Temperature alarm base, 2. Mounting hole, 3. Wire hole, 4. Fixing structure, 401. Groove, 402. Spring, 403. Ball, 404. Rubber sleeve, 5. Thermistor, 6. Protective structure, 7. Internally threaded round shell, 8. Filter plate, 9. Rubber ring, 10. Clamping structure, 11. Block, 12. Slot, 13. Elastic part, 14. Thermistor, 15. Sampling resistor, 16. Threshold circuit, 17. Bistable circuit, 18. Externally threaded round shell, 19. Mounting slot. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of this patent to clearly and completely describe the technical solutions in the embodiments of this patent. Obviously, the embodiments described are only part of the embodiments of this patent, not all of them. Based on the embodiments of this patent, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this patent.

[0024] See also Figure 1-4 This patent provides a technical solution: a fixing structure for a thermal element of a fire temperature alarm, comprising a temperature alarm base 1 and a thermal element 5. The temperature alarm base 1 is provided with mounting holes 2, the number of which is four and which are equidistantly distributed in a circular pattern on the temperature alarm base 1. The temperature alarm base 1 can be installed in a designated position through the mounting holes 2. The temperature alarm base 1 is provided with a mounting groove 19, and the thermal element 5 is installed in the mounting groove 19 through a fixing structure 4, the number of which is four and which are equidistantly distributed in a circular pattern on the temperature alarm base 1.

[0025] The fixing structure 4 includes a groove 401, a spring 402, a ball 403 and a rubber sleeve 404;

[0026] The groove 401 is opened in the mounting groove 19, the spring 402 is installed in the groove 401, the ball 403 is installed on the spring 402, the rubber sleeve 404 is installed on the ball 403, the thermistor 5 is placed in the mounting groove 19, the rubber sleeve 404 is pressed against the thermistor 5, and the thermistor 5 extends into the mounting groove 19 on the temperature alarm base 1. At this time, the thermistor 5 is in contact with the rubber sleeve 404 on the ball 403, and the ball 403 compresses the spring 402 into the groove 401. Conversely, through the elasticity of the spring 402, the ball 403 is pressed against the thermistor 5 with the rubber sleeve 404, which facilitates the fixation of the thermistor 5 on the temperature alarm base 1, and when the thermistor 5 is moved up, the thermistor 5 is conveniently disassembled and repaired.

[0027] A protective structure 6 is installed on the base 1 of the temperature alarm. The protective structure 6 includes an internal threaded circular shell 7, a filter plate 8, a rubber ring 9 and an external threaded circular shell 18.

[0028] The external threaded round shell 18 is installed on the temperature alarm base 1, the internal threaded round shell 7 is sleeved on the external threaded round shell 18, and the internal threaded round shell 7 is threaded only at the position where it contacts the external threaded round shell 18. The rubber ring 9 is installed on the filter plate 8, and the filter plate 8 is made of stainless steel with through holes on the surface. The rubber ring 9 is inserted into the internal threaded round shell 7, so that the internal threaded round shell 7 is screwed on the external threaded round shell 18, and the thermal element 5 enters the installation groove 19 fixed on the temperature alarm base 1 through the internal threaded round shell 7. At this time, the filter plate 8 is inserted into the internal threaded round shell 7 with the rubber ring 9, and the filter plate 8 can make the thermal element 5 dust-proof.

[0029] The rubber sleeve 404 is mounted on the ball 403 via a clamping structure 10. The clamping structure 10 is arranged corresponding to the rubber sleeve 404. The clamping structure 10 includes a clamping block 11, a clamping slot 12, and an elastic member 13.

[0030] The card block 11 is installed on the rubber sleeve 404, the card slot 12 is opened on the ball 403, the elastic member 13 is installed in the card block 11, the elastic member 13 is made of a sample steel sheet to enhance the elasticity of the card block 11, the rubber sleeve 404 is sleeved on the ball 403, the card block 11 is clamped in the card slot 12, the rubber sleeve 404 is sleeved on the ball 403, and the card block 11 is clamped into the card slot 12, so that the rubber sleeve 404 is installed on the ball 403.

[0031] The thermal element 5 includes a thermistor 14, a sampling resistor 15, a threshold circuit 16 and a bistable circuit 17;

[0032] Thermistor 14 is a thermistor CTR. Thermistor 14 is electrically connected to a sampling resistor 15. A threshold circuit 16 is electrically connected to the circuit between thermistor 14 and sampling resistor 15. The threshold circuit 16 is electrically connected to a bistable circuit 17. The bistable circuit 17 is electrically connected to the circuit between thermistor 14 and sampling resistor 15. A wire hole 3 is provided in the base 1 of the temperature alarm. A mounting slot 19 is connected to the wire hole 3. External wires can pass through the wire hole 3 and connect to the circuit of thermistor 14. Electronic differential temperature fire detectors typically use thermistors as thermal elements. They utilize the thermistor's changing resistance with temperature to conduct the circuit, thereby achieving differential and constant temperature functions. Most electronic differential temperature fire detectors use two negative temperature coefficient thermistors: one for sampling and one for compensation. When the external temperature changes slowly, the compensation resistor plays a primary role, resulting in a constant temperature characteristic. When the external temperature changes rapidly, the sampling resistor reacts quickly, while the compensation resistor reacts more slowly, resulting in a differential temperature characteristic.

[0033] When using the fixing structure of the thermal element of the fire temperature alarm, first, the base 1 of the temperature alarm can be installed in the specified position through the mounting hole 2, and the rubber sleeve 404 is sleeved on the ball 403. Then the block 11 is clamped into the slot 12, and the rubber sleeve 404 is installed on the ball 403. The internal threaded shell 7 is screwed on the external threaded shell 18, and the thermal element 5 is extended into the mounting slot 19 fixed on the base 1 of the temperature alarm through the internal threaded shell 7. At this time, the thermal element 5 is in contact with the rubber sleeve 404 on the ball 403, and the ball 403 will bounce. Spring 402 is compressed into groove 401. The elasticity of spring 402 forces ball 403, with rubber sleeve 404, to press against thermistor 5, facilitating its attachment to the temperature alarm base 1. This also facilitates removal and maintenance when thermistor 5 is moved upward. By inserting filter plate 8 with rubber ring 9 into internally threaded housing 7, filter plate 8 protects thermistor 5 from dust. External wiring, passing through wire hole 3, can be connected to the circuit of thermistor 14. Electronic differential temperature fire detectors typically use thermistors as thermal elements. They utilize the thermistor's temperature-dependent resistance to conduct the circuit, thereby achieving both differential and constant temperature functions. Most electronic differential temperature fire detectors use two negative temperature coefficient (NTC) thermistors: one for sampling and one for compensation. When the external temperature changes slowly, the compensation resistor plays a primary role, resulting in a constant temperature characteristic. When the external temperature changes rapidly, the sampling resistor reacts quickly, while the compensation resistor reacts more slowly, resulting in a differential temperature characteristic.

[0034] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fixing structure for a heat-sensitive element of a fire temperature alarm, comprising a temperature alarm base (1) and a heat-sensitive element (5), characterized in that: The temperature alarm base (1) is provided with a mounting groove (19), and the thermal element (5) is mounted in the mounting groove (19) via a fixing structure (4). The number of the fixing structures (4) is four, and the fixing structures (4) are distributed in an annular manner and at equal intervals in the mounting groove (19); The fixing structure (4) comprises a groove (401), a spring (402), a ball (403) and a rubber sleeve (404); The groove (401) is opened in the installation groove (19), the spring (402) is installed in the groove (401), the ball (403) is installed on the spring (402), the rubber sleeve (404) is installed on the ball (403), the thermal element (5) is placed in the installation groove (19), and the rubber sleeve (404) is pressed against the thermal element (5).

2. The fixing structure of the thermal element of a fire temperature alarm according to claim 1, characterized in that: A protective structure (6) is installed on the temperature alarm base (1), and the protective structure (6) includes an internal threaded circular shell (7), a filter plate (8), a rubber ring (9) and an external threaded circular shell (18); The external threaded circular shell (18) is installed on the base (1) of the temperature sensing alarm, the internal threaded circular shell (7) is sleeved on the external threaded circular shell (18), the rubber ring (9) is installed on the filter plate (8), and the rubber ring (9) is inserted into the internal threaded circular shell (7).

3. The fixing structure of the thermal element of a fire temperature alarm according to claim 1, characterized in that: The rubber sleeve (404) is mounted on the ball (403) via a clamping structure (10), the clamping structure (10) and the rubber sleeve (404) are arranged correspondingly, and the clamping structure (10) includes a clamping block (11), a clamping groove (12) and an elastic member (13); The clamping block (11) is mounted on the rubber sleeve (404), the clamping slot (12) is provided on the ball (403), the elastic member (13) is mounted in the clamping block (11), the rubber sleeve (404) is sleeved on the ball (403), and the clamping block (11) is clamped in the clamping slot (12).

4. The fixing structure of the heat sensitive element of a fire temperature alarm according to claim 1, characterized in that: The thermal element (5) includes a thermistor (14), a sampling resistor (15), a threshold circuit (16) and a bistable circuit (17); The thermistor (14) is electrically connected to the sampling resistor (15), the threshold circuit (16) is electrically connected to the circuit of the thermistor (14) and the sampling resistor (15), the threshold circuit (16) is electrically connected to the bistable circuit (17), and the bistable circuit (17) is electrically connected to the circuit of the thermistor (14) and the sampling resistor (15).

5. The fixing structure of the heat sensitive element of a fire temperature alarm according to claim 1, characterized in that: A wire hole (3) is provided on the temperature alarm base (1), and the mounting groove (19) is connected to the wire hole (3).

6. The fixing structure of the heat sensitive element of a fire temperature alarm according to claim 1, characterized in that: The temperature alarm base (1) is provided with mounting holes (2), the number of the mounting holes (2) is four, and the mounting holes (2) are distributed in a circular shape and at equal intervals on the temperature alarm base (1).

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