A constant temperature fire detector

Abstract

The present application relates to the field of fire fighting, and aims to provide a constant temperature fire detector to solve the technical problem that the internal electric connection of the existing detector is prone to failure and the circuit is prone to malfunction, thus failing to alarm. The constant temperature fire detector comprises a sealed bin, a detection mechanism and a compressed gas container. The compressed gas container is used for storing high-pressure gas, and the high-pressure gas is discharged through the exhaust port on the sealed bin after the compressed gas container is broken. The detection mechanism comprises a mounting base directly or indirectly arranged on the sealed bin. The mounting base is slidably assembled with an impact component in the direction towards and away from the sealed bin. The mounting base is further provided with an elastic member for driving the impact component to penetrate into the sealed bin and pierce the compressed gas container. The constant temperature fire detector further comprises a retaining body. The retaining body is used for overcoming the elastic force of the elastic member and limiting the impact component to make the impact component and the compressed gas container spaced apart from each other. The retaining body is broken or melted when the temperature reaches a threshold value to reset the elastic member.

Description

Technical Field

[0001] This invention relates to the field of fire protection, specifically to a constant-temperature fire detector. Background Technology

[0002] Common heat-sensitive fire detectors contain a thermal element that detects fires. When a fire occurs, the ambient temperature in the fire area rises significantly in a short period of time. The thermal element is affected by the temperature and undergoes physical changes. After being heated, the thermal element converts the heat signal into an alarm electrical signal, which triggers the alarm devices in the set area to process the alarm. Therefore, heat-sensitive fire detectors are widely used in the fire protection field.

[0003] Heat-sensitive fire detectors can be broadly classified into two categories based on the mechanical structure of their sensors: mechanical and electronic. Each category can be further divided into fixed-temperature detectors, differential-temperature detectors, and differential-fixed-temperature detectors based on the response characteristics of their sensors. Fixed-temperature fire detectors trigger an alarm signal when the ambient temperature reaches or exceeds a preset temperature. Common types of fixed-temperature fire detectors include bimetallic, fusible metal, and electronic. Bimetallic fixed-temperature detectors operate on the principle that the different thermal expansion coefficients of the two metals cause them to deform differently when heated. At a certain temperature, this deformation closes the contacts, generating an electrical signal. Fusible metal fixed-temperature detectors operate on the principle that the fusible alloy melts and detaches at a certain temperature. An internal spring or other mechanism then operates the electrical control system to close the contacts, triggering an alarm signal. Electronic fixed-temperature detectors operate on the principle that the resistance of components such as thermistors decreases with increasing temperature. When the temperature reaches a certain threshold, the current changes to a specific value, generating an alarm.

[0004] As can be seen from the above working principle, existing fixed-temperature fire detectors convert temperature signals into electrical signals. The electrical signals are electrically connected to the alarm system through the circuit, and the electrical signals cause the alarm system to sound an alarm. However, fixed-temperature fire detectors are prone to electrical connection failure or circuit failure in harsh high-temperature environments or environments with large temperature fluctuations. This prevents the fire detector from sounding an alarm within its fixed temperature range, and it cannot play its specific fire monitoring role when a fire occurs, ultimately leading to a fire accident. Summary of the Invention

[0005] The purpose of this invention is to provide a constant temperature fire detector to solve the technical problem that existing constant temperature fire detectors are prone to electrical connection failures and circuit malfunctions, thus failing to alarm.

[0006] To achieve the above objectives, the technical solution of the present invention for a constant-temperature fire detector is as follows:

[0007] A constant-temperature fire detector includes a sealed chamber and a compressed gas container disposed within the sealed chamber. The compressed gas container stores high-pressure gas. The sealed chamber has an exhaust port, through which the high-pressure gas can be discharged after the compressed gas container ruptures. The constant-temperature fire detector also includes a detection mechanism, which includes a mounting base directly or indirectly disposed on the sealed chamber. An impact component is slidably mounted on the mounting base in directions toward and away from the sealed chamber. The mounting base also has an elastic element that drives the impact component to move toward the sealed chamber to penetrate the sealed chamber and puncture the compressed gas container. The constant-temperature fire detector includes a retainer fixed on the mounting base. The retainer is used to overcome the elastic force of the elastic element and limit the impact component to keep it separated from the compressed gas container. The retainer is used to rupture or melt when the temperature reaches a set threshold to reset the elastic element.

[0008] Beneficial Effects: The constant-temperature fire detector of this invention includes a sealed chamber and a detection mechanism connected to the sealed chamber. The overall structure is mechanical. When a fire occurs within the detector's deployment area, high-pressure gas from the compressed gas container inside the sealed chamber is ejected, triggering subsequent related mechanisms. When the temperature is below a set threshold, the impact component is held in place by the retainer, thus isolating it from the compressed gas container. When the temperature within the deployment area exceeds the threshold, the retainer melts or ruptures. At this time, the elastic element elastically recovers in the direction towards the compressed gas container, and its elastic force ejects the impact component. The impact component is ejected into the sealed chamber, puncturing the compressed gas container, thereby filling the sealed chamber with high-pressure gas. The high-pressure gas is then discharged through the exhaust port, impacting and triggering subsequent related mechanisms. The entire process achieves efficient conversion between temperature and pressure signals. Compared with the existing technology of converting temperature signals to electrical signals, this method eliminates the need for circuitry and electrical connections, effectively solving the technical problem of electrical connection failures and circuit malfunctions that prevent alarms in existing constant-temperature fire detectors.

[0009] Preferably, the sealed chamber is provided with a protective sleeve that extends into the sealed chamber; the impact component includes a striker located inside the protective sleeve, and also includes a push rod that extends into the protective sleeve and drives the striker to move. One end of the protective sleeve extends into the sealed cavity, and the other end can extend into the push rod to press against the striker, thereby ensuring the sealing performance of the sealed chamber and preventing high-pressure gas from leaking from the point where the protective sleeve enters the sealed chamber.

[0010] Preferably, the impact component includes a guide post, a push rod mounted on the guide post, and a flange with a radially outer edge at one end of the guide post facing the sealing chamber. The elastic element is a compression spring elastically compressed between the flange and the mounting base. The guide post can stably press the compression spring into the mounting base and can smoothly support and push the push rod, ensuring a stable driving force for the elastic impact of the impact component.

[0011] Preferably, the mounting base includes a baffle plate for engaging with the guide post to limit the extent to which the guide post can move toward the sealing chamber. The baffle plate has a through hole for the push rod to pass through. The baffle plate limits the movement of the guide post and the compression spring within the mounting base, preventing the guide post from moving excessively and impacting the sealing chamber.

[0012] Preferably, the end of the protective sleeve furthest from the sealing chamber is supported on a baffle. This allows the protective sleeve to be installed and supported stably, while further ensuring the sealing of the protective sleeve connection arrangement.

[0013] Preferably, at least two connecting posts are provided between the mounting base and the sealing chamber, with a gap between adjacent connecting posts, and the retainer is connected to the gap between adjacent connecting posts. The mounting base is connected to the sealing chamber through the connecting posts and connects the retainer to the gap between the connecting posts, thereby exposing the retainer to the outside of the sealing chamber and the mounting base, allowing the retainer to be directly connected to the air in the arrangement area to directly sense temperature changes in the arrangement area.

[0014] Preferably, a first support column is fixed on the sealed chamber, and a second support column is provided on the impact component. The first and second support columns are staggered, and the retaining body is provided between the two support columns, located between the sealed chamber and the mounting base. The staggered arrangement of the first and second support columns ensures that they do not interfere with each other when the retaining body melts or breaks, causing the elastic element to reset, thus guaranteeing the reliability of the elastic reset.

[0015] Preferably, the retainer is a fusible alloy that melts when the temperature reaches a set threshold.

[0016] Preferably, the retainer is a fire-resistant heat-sensitive glass bulb, which breaks when the temperature reaches the set threshold.

[0017] Preferably, a pipe connector is connected to the exhaust port. The pipe connector can be used to connect a gas valve or pipe, facilitating the interface between the constant temperature fire detector and the alarm system. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the constant temperature fire detector in Embodiment 1 provided by the present invention;

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. Mounting base; 2. Sealing chamber; 3. Exhaust pipe; 4. Pipe joint; 5. Guide post; 6. Compression spring; 7. Top rod; 8. Baffle; 9. Retainer; 10. First support post; 11. Protective sleeve; 12. Connecting post; 13. Second support post; 14. Edge retainer. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0023] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising a…" does not exclude the process or method that includes said element.

[0024] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "provided with" should be interpreted broadly. For example, the object "provided with" can be a part of the main body, or it can be separately arranged from the main body and connected to the main body. This connection can be a detachable connection or a non-detachable connection. Those skilled in the art can understand the specific meaning of the above terms in this invention through specific circumstances.

[0026] The present invention will be further described in detail below with reference to embodiments.

[0027] Specific embodiment 1 of the constant temperature fire detector provided by the present invention:

[0028] like Figure 1 As shown, the constant temperature fire detector in this embodiment includes a sealed chamber 2 arranged vertically at intervals and a detection mechanism. The detection mechanism includes a mounting base 1 fixed below the sealed chamber 2. The constant temperature fire detector also includes a retainer 9 fixed on the mounting base 1. The mounting base 1 is provided with an elastic element and an impact component. The upper end of the sealed chamber 2 is provided with an exhaust port, and an exhaust pipe 3 is connected to the exhaust port. The exhaust pipe 3 is used to connect to the alarm system when the constant temperature fire detector is connected and arranged. In this embodiment, the alarm system connected to the constant temperature fire detector is a pneumatic water valve and its water supply pipe. The retainer 9 can keep the elastic element in a compressed state and limit the impact component after the connection arrangement so that the impact component and the sealing chamber 2 are separated from each other. The retainer 9 can melt and deform when the temperature in the arrangement area reaches its set threshold range, so that the elastic element elastically recovers and the impact component is ejected upward into the sealing chamber 2. The sealing chamber 2 is equipped with a compressed gas container, which stores high-pressure gas. The compressed gas container can be punctured by the impact component when the impact component is ejected into the sealing chamber 2, so that the high-pressure gas stored inside can be discharged. The high-pressure gas is sent to the alarm system through the exhaust pipe 3 to realize the conversion of thermal signal and pneumatic pressure signal, thereby triggering the alarm.

[0029] like Figure 1 As shown, the sealed chamber 2 is a closed box-type structure, and the mounting base 1 is a cylindrical structure fixed to the lower end of the sealed chamber 2. The mounting base 1 extends vertically, and the exhaust pipe 3 is located at the upper end of the sealed chamber 2, communicating with the interior of the sealed chamber 2. The compressed gas container includes a gasbag fixed inside the sealed chamber 2 and internally sealed to store high-pressure gas. Figure 1 As shown, the mounting base 1 is fixed to the lower end of the sealing chamber 2 by the connecting column 12. There are multiple connecting columns 12, all of which are fixed to the outer periphery of the upper end face of the mounting base 1. The connecting column 12 forms an exposed gap between the mounting base 1 and the sealing chamber 2. The retainer 9 is placed in the gap, so that it can be exposed to the air to sense the temperature.

[0030] like Figure 1As shown, in this embodiment, the elastic element is a compression spring 6 that extends vertically within the mounting base 1, with its bottom fixed to the bottom of the inner cavity of the mounting base 1. The impact component includes a guide post 5 passing through the compression spring 6. The outer periphery of the top of the guide post 5 has a radially horizontally extending flange 14, which can press the compression spring 6 downwards to compress it. When the bottom of the guide post 5 contacts the bottom of the inner cavity of the mounting base 1, the compression spring 6 is in a compressed state. A vertically extending push rod 7 is fixed to the top of the guide post 5, which can move upwards with the guide post 5 when the compression spring 6 elastically recovers upwards. The top of the mounting base 1 has a horizontally extending baffle 8, which seals the top of the mounting base 1 and also serves to stop the top of the guide post 5, thereby limiting the upward movement limits of the guide post 5 and the compression spring 6. The baffle 8 has a push rod through hole for the push rod 7 to pass through, allowing the push rod 7 to extend out of the baffle and enter the gap between the mounting base 1 and the sealing chamber 2.

[0031] like Figure 1 As shown, a protective sleeve 11 is provided on the sealed chamber 2. The protective sleeve 11 is located in the gap between the mounting base 1 and the sealed chamber 2. The top end of the protective sleeve 11 is fixed to the bottom of the sealed chamber 2 and extends into the sealed chamber 2 to communicate with it. The bottom end of the protective sleeve 11 is supported on the baffle 8. The impact component also includes a striker pin that is slidably assembled in the protective sleeve 11. The bottom end of the protective sleeve 11 corresponds to the push rod through hole on the baffle 8, so that the push rod 7 can extend into the protective sleeve 11 after passing through the push rod through hole. This allows the push rod 7 to extend into the protective sleeve 11 to press the striker pin when the compression spring 6 elastically returns, driving the striker pin to move into the sealed chamber 2.

[0032] To ensure that the guide post 5 remains in the initial state of pressing down on the compression spring 6 during initial setup, such as... Figure 1 As shown, the baffle 8 is provided with top pressure perforations spaced apart from the top rod perforations. The bottom of the sealing chamber 2 is fixed with a first support column 10 that is adjacent to the protective sleeve 11 and extends downward. The top of the guide column 5 is provided with a second support column 13 that passes through the top pressure perforations and extends into the interval. The first support column 10 and the second support column 13 are staggered vertically. A retaining body 9 is provided between the two support columns to fix their respective adjacent ends. The retaining body 9 keeps the second support column 13 in a state of pressing the guide column 5 downward, thereby keeping the compression spring 6 in a compressed state.

[0033] In this embodiment, the retainer 9 is made of a fusible alloy, which fixes the opposite ends of the first support column 10 and the second support column 13. The retainer 9 can sense temperature changes in the arrangement area within the gap between the sealed chamber 2 and the mounting base 1. When the temperature rises above the melting threshold of the fusible alloy, the retainer 9 melts and can no longer support the connection that fixes the first support column 10 and the second support column 13. The first support column 10 and the second support column 13 can then disengage from their fixed state. The guide column 5 can move upward under the elastic return pressure of the compression spring 6, thereby causing the top rod 7 at its top to knock out the striker in the protective sleeve 11. The striker can move upward along the protective sleeve 11 into the sealed chamber 2, thereby puncturing the air bladder in the compressed gas container. The compressed gas in the sealed chamber 2 can then be discharged from the exhaust port, thereby triggering the alarm system.

[0034] In this embodiment, the entire mounting base 1 is made of alloy to ensure its connection strength. The exhaust pipe 3 at the top of the sealed chamber 2 extends horizontally, and the exhaust pipe 3 is equipped with a pipe connector 4 for interfacing with the alarm system. The connection and alarm triggering process of the constant temperature fire detector in this embodiment within the designated area is as follows: First, the constant temperature fire detector is fixed in the designated area. The sealed chamber 2 and the mounting base 1 can be fixed by connecting parts or connecting plates. Then, the pipe connector 4 of the exhaust pipe 3 is connected to the trigger valve of the alarm system to complete the installation of the constant temperature fire detector. When a fire occurs within the detector's deployment area or the temperature exceeds the melting threshold of the fusible metal, the fusible metal melts and deforms, causing the first support column 10 and the second support column 13 to detach from their fixed positions. At this time, the pressure on the compression spring 6 disappears, and the compression spring 6 pushes the guide column 5 upward. The guide column 5 pushes the top rod 7 upward, and the top rod 7 passes through the top rod perforation and extends into the protective sleeve 11, pushing the striker upward. The striker moves upward along the protective sleeve 11 and enters the sealed chamber 2. The striker can puncture the compressed gas container, allowing high-pressure gas to enter the exhaust pipe 3 from the exhaust port of the sealed chamber 2. Finally, the high-pressure gas in the exhaust pipe 3 rushes into the pneumatic water valve of the alarm system through the pipe joint 4, causing the water valve to open for fire extinguishing and simultaneously triggering the alarm device on the water valve, thus activating the alarm system. In this embodiment, by using different types of fusible metals, the temperature threshold of the constant-temperature fire detector can also be varied, making the constant-temperature fire detector suitable for more deployment scenarios.

[0035] In this embodiment, the fixed-temperature fire detector is equipped with a mechanically pneumatic mounting base 1 and a sealed chamber 2. When a fire occurs in the detector's area, the spring 6 drives the top rod 7 to trigger the striker. The entire triggering process of the fixed-temperature fire detector achieves efficient conversion between temperature and pressure signals. The alarm system is directly driven by the elastically transmitted mechanical transmission and gas pressure, eliminating the need for circuit connections and electrical components. This effectively solves the technical problem in the prior art where fixed-temperature fire detectors are prone to electrical connection failures and circuit malfunctions, thus failing to trigger an alarm.

[0036] Specific embodiment 2 of the constant temperature fire detector provided by the present invention:

[0037] The difference from Embodiment 1 is that, in Embodiment 1, a protective sleeve 11 is provided on the sealed chamber 2, the protective sleeve 11 extends into the sealed chamber 2, and a striking pin is provided inside the protective sleeve 11. A push rod 7 that drives the striking pin to move is provided on the guide post 5. In this embodiment, the protective sleeve is omitted, and a striking pin through hole is provided at the bottom of the sealed chamber. The top of the striking pin extends into the striking pin through hole to maintain a distance from the compressed gas container, and the bottom of the striking pin extends to contact the push rod. In other embodiments, the push rod and the protective sleeve can also be omitted simultaneously, and a striking pin with its tip extending into the sealed chamber can be directly provided on the top of the guide post. When the guide post moves upward, it drives the striking pin upward, thereby puncturing the compressed gas container.

[0038] Specific embodiment 3 of the constant temperature fire detector provided by the present invention:

[0039] The difference from Embodiment 1 is that, in Embodiment 1, the impact component includes a guide post 5, and the top of the guide post 5 is provided with a radially horizontally extending flange 14, which can press down on the compression spring 6 to compress the compression spring 6. In this embodiment, a horizontally extending top plate is provided on the top of the compression spring, which can compress the compression spring downward, and the top rod and the second support post are both provided on the top plate.

[0040] Specific embodiment 4 of the constant temperature fire detector provided by the present invention:

[0041] The difference from Example 1 is that, in Example 1, the retainer 9 was made of fusible metal. In this example, the retainer is a fire-resistant heat-sensitive glass sphere, which can crack upon reaching its melting threshold. The fire-resistant heat-sensitive glass sphere is supported and fixed between the first and second support columns. The material of the retainer in this invention can also be changed; any retainer capable of melting upon heating within the threshold is within the protection scope.

[0042] Specific embodiment 5 of the constant temperature fire detector provided by the present invention:

[0043] The difference from Embodiment 1 is that, in Embodiment 1, the bottom of the sealing chamber 2 is provided with a first support column 10, and the guide column 5 is provided with a second support column 13. The first support column 10 and the second support column 13 are arranged alternately and fixed by the retainer 9. In this embodiment, the first support column and the second support column are vertically aligned. In this case, the retainer needs to be made into a long rod-shaped structure to ensure the movement distance of the guide column 5 when the retainer melts. In other embodiments, the first support column and the second support column can be directly replaced by the retainer. It is only necessary to make the retainer into a columnar structure. For example, the guide rod is provided with an upwardly extending support column, and the bottom of the sealing chamber is provided with a downwardly extending columnar retainer. The retainer and the support column press against each other to compress the compression spring. Therefore, in extreme cases, the first support column and the second support column can be omitted. The retainer can be made into a long columnar structure, and then the retainer is placed between the sealing chamber and the mounting base to compress the compression spring.

[0044] Specific embodiment 6 of the constant temperature fire detector provided by the present invention:

[0045] The difference from Embodiment 1 is that in Embodiment 1, the elastic element is a compression spring 6, and the impact component includes a guide post 5 that cooperates with the compression spring 6. In this embodiment, the elastic element is a tension spring, one end of which is fixed to the baffle plate. The impact component includes a connecting plate at the other end extending downwards, and a second support post is provided on the connecting plate. The connecting plate can be pressed downwards against the tension of the tension spring to maintain the tension of the tension spring. The tension spring can return to an upward pull when the retainer melts, thereby knocking out the impact pin in the impact component.

[0046] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A constant temperature fire detector characterised in that, The detector includes a sealed chamber (2) and a compressed gas container located within the sealed chamber (2). The compressed gas container is used to store high-pressure gas. The sealed chamber (2) is provided with an exhaust port, through which the high-pressure gas can be discharged after the compressed gas container ruptures. The constant-temperature fire detector also includes a detection mechanism, which includes a mounting base (1) fixed below the sealed chamber (2). An impact component is slidably mounted on the mounting base (1) in the direction toward and away from the sealed chamber (2). A protective sleeve (11) is provided on the sealed chamber (2), which extends into the sealed chamber (2). The impact component includes a striker located within the protective sleeve (11). The mounting base (1) The device is also equipped with an elastic element that drives the impact component to move toward the sealed chamber to penetrate into the sealed chamber (2) and puncture the compressed gas container; a first support column (10) is fixed on the sealed chamber (2), and a second support column (13) is provided on the impact component. The first support column (10) and the second support column (13) are staggered. A retainer (9) is provided between the two support columns. The retainer (9) is located between the sealed chamber (2) and the mounting base (1). The retainer (9) is used to overcome the elastic force of the elastic element and limit the impact component so that the impact component and the compressed gas container are separated from each other. The retainer (9) is used to break or melt when the temperature reaches a set threshold so that the elastic element is reset. At least two connecting columns (12) are provided between the mounting base (1) and the sealed chamber (2). There is a gap between adjacent connecting columns (12). The gap between the retainer (9) and the adjacent connecting column (12) is connected.

2. The constant temperature fire detector of claim 1 wherein, The impact component also includes a push rod (7) that extends into the protective sleeve (11) and drives the impact pin to move.

3. The fixed temperature fire detector of claim 2 wherein, The impact component includes a guide post (5), a push rod (7) is provided on the guide post (5), and a flange (14) with a radial outer edge is provided at one end of the guide post (5) facing the sealing chamber (2). The elastic element is a compression spring (6) that is elastically compressed between the flange (14) and the mounting base (1).

4. The fixed temperature fire detector of claim 3 wherein, The mounting base (1) includes a baffle (8) for engaging with the guide post (5) to limit the extent to which the guide post (5) can move toward the sealing chamber (2). The baffle (8) has a through hole for the push rod (7) to pass through.

5. The constant-temperature fire detector according to claim 4, characterized in that, The end of the protective sleeve (11) away from the sealing chamber (2) is supported on the baffle (8).

6. The fixed temperature fire detector according to any one of claims 1-5, wherein, The retainer (9) is a fusible alloy that melts when the temperature reaches a set threshold.

7. The fixed temperature fire detector according to any one of claims 1-5, wherein, The retainer (9) is a fire-resistant heat-sensitive glass ball, which breaks when the temperature reaches the set threshold.

8. The fixed temperature fire detector according to any one of claims 1-5, wherein, A pipe fitting (4) is connected to the exhaust port.

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