Temperature sensing reaction device and fireproof check valve

Abstract

The utility model relates to the technical field of check valves, in particular to a temperature sensing reaction device and a fireproof check valve, the temperature sensing reaction device comprises a mounting table, a baffle, an elastic piece and a temperature sensing material; when the temperature rises to the melting point of the temperature-sensitive material, the temperature-sensitive material melts, and the elastic force of the elastic piece enables the baffle to rotate to an unfolded state. The temperature sensing reaction device can further comprise a motor, a temperature sensing element and a circuit board. The motor is used for driving the fan blade plate to rotate, so that the fan blade plate is in an open state or a closed state; the circuit board is used for judging whether the range hood is started; the temperature sensing element is electrically connected with the circuit board and is used for detecting temperature. The fan blade plates are obliquely arranged, the hinged ends of the fan blade plates are located at the upper end of the flue gas channel, oil dirt can be prevented from being accumulated at the hinged ends of the fan blade plates, the fan blade plates can be easily pushed away by flue gas needing to be exhausted, when the flue gas does not need to be exhausted, the obliquely arranged fan blade plates can automatically fall back by means of gravity, and the fan blade plates are not prone to falling off. Therefore, the flue gas channel is cut off.

Description

Technical Field

[0001] This utility model relates to the field of check valve technology, specifically to a temperature-sensing reaction device and a fireproof check valve. Background Technology

[0002] Check valves are typically installed in ventilation ducts in public places or in the exhaust ducts of range hoods to prevent the spread of hot smoke in the event of a fire. Check valves used in public flues or for direct exhaust from exterior walls require higher standards for their opening efficiency, fire resistance, and sealing performance.

[0003] For example, Chinese invention patent CN113790291B discloses a fireproof check valve, which includes a valve body, a valve seat, and a valve disc. The valve body is installed on the residential exhaust duct and located outside the residential exhaust duct. The valve body is used to provide an exhaust passage and is connected to the air inlet of the residential exhaust duct. The valve seat is disposed on the valve body and located on the air inlet side of the exhaust passage. The valve disc is rotatably disposed on the valve body and cooperates with the valve seat to open or close the exhaust passage. The plane on which the valve seat is located is inclined downward toward the air inlet side of the exhaust passage. An air inlet pipe is provided on the valve seat, so that when the gas enters the exhaust passage from the air inlet pipe, it has an inclined upward flow direction.

[0004] In the aforementioned prior art, the opening and closing mechanism includes torsion springs, tower springs, valve shafts, supports, etc., and the opening and closing of the valve disc depends entirely on the opening and closing mechanism. These parts are all installed at the lower end of the valve body. However, during the flue gas flow process, oil droplets and dust are often carried. Oil and dust easily accumulate at the lower end of the valve body, making the opening and closing mechanism susceptible to corrosion and blockage by oil. This results in obstruction of the valve disc's opening and closing, such as the inability to fully open or close, affecting the exhaust and fire prevention / smoke control functions. Utility Model Content

[0005] To address the problems in existing technologies where valve discs rely entirely on opening and closing mechanisms and where these mechanisms are easily affected by oil contamination, the purpose of this invention is to provide a temperature-sensing reaction device and a fireproof check valve.

[0006] The technical solution provided by this utility model is as follows:

[0007] In a first aspect, a temperature-sensing response device includes a mounting platform, a baffle, an elastic element, and a temperature-sensing material;

[0008] in:

[0009] The baffle is located on one side of the mounting platform and is hinged to the mounting platform.

[0010] The baffle is also connected to the mounting platform via an elastic element and is fixedly connected to the mounting platform via a temperature-sensitive material;

[0011] When the temperature rises to the melting point of the temperature-sensitive material, the material melts, and the elastic force of the elastic element causes the baffle to rotate to the open state. The baffle then presses against the fan blade plate, keeping the fan blade plate in the closed state.

[0012] As an optional technical solution in the first aspect, the baffle is provided with an insert; the mounting platform is provided with a through hole for the insert to pass through;

[0013] A stop block is installed through the through hole, and the stop block abuts against the mounting platform; the stop block is made of the temperature-sensitive material.

[0014] As an optional technical solution in the first aspect, the mounting platform is connected to a first connecting piece, and the baffle is connected to a second connecting piece; the first connecting piece and the second connecting piece are connected by a temperature-sensitive material.

[0015] Optionally, the temperature-sensitive material has a melting point of 120°C to 190°C.

[0016] As an optional technical solution of the first aspect, the baffle is hinged to the mounting platform via a first connecting shaft; the elastic element is a torsion spring, which is sleeved on the first connecting shaft; the two extensions of the torsion spring abut against the baffle and the mounting platform respectively;

[0017] And / or:

[0018] The elastic element is a tension spring, and its two ends are connected to a baffle and a mounting platform, respectively.

[0019] Secondly, a fireproof check valve includes:

[0020] The valve body includes a seat and a cylinder connected to the seat, and the seat and cylinder are provided with flue gas passages;

[0021] The fan blade is installed in the flue gas passage; the flue gas passage on one side of the fan blade is the flue gas inlet end, and the flue gas passage on the other side is the flue gas outlet end.

[0022] The upper end of the fan blade is inclined toward the flue gas inlet and is hinged to the valve body; the fan blade can be pushed by the flue gas to rotate toward the flue gas outlet, so that the flue gas passage is in a connected state; or, the fan blade can be rotated toward the flue gas inlet by gravity, so that the flue gas passage is in a cut-off state.

[0023] The upper part of the flue gas discharge end is provided with a temperature sensing device as described in the first aspect;

[0024] The mounting platform is connected to the valve body; when the baffle is rotated to the unfolded state, the baffle abuts against the fan blade, thus cutting off the flue gas passage.

[0025] Thirdly, a temperature-sensing response device includes a motor, a temperature-sensing element, and a circuit board;

[0026] in:

[0027] The motor is used to drive the fan blades to rotate, so that the fan blades are in the open or closed state;

[0028] The circuit board is used to electrically connect with the range hood, motor, and temperature sensing element to determine whether the range hood is on. When the range hood is on, the motor drives the fan blades to rotate to the open state; when the range hood is off, the motor drives the fan blades to rotate to the closed state.

[0029] The temperature sensing element is electrically connected to the circuit board and is used to detect the temperature; when the temperature exceeds 120°C, the motor can drive the fan blades to rotate to the closed state.

[0030] As an alternative technical solution in the second aspect, it also includes a storage battery used to power the circuit board, motor and temperature sensing element.

[0031] Fourthly, a fireproof check valve includes:

[0032] The valve body includes a seat and a cylinder connected to the seat, and the seat and cylinder are provided with flue gas passages;

[0033] The fan blade is installed in the flue gas passage; the flue gas passage on one side of the fan blade is the flue gas inlet end, and the flue gas passage on the other side is the flue gas outlet end; the upper end of the fan blade is inclined towards the flue gas inlet end.

[0034] The upper part of the flue gas discharge end is provided with a temperature sensing device as described in the third aspect;

[0035] The motor is mounted on the valve body;

[0036] When the motor drives the fan blades to rotate to the open state, the fan blades rotate toward the flue gas discharge end, so that the flue gas passage is in a connected state.

[0037] When the motor drives the fan blades to rotate to the closed state, the fan blades rotate toward the flue gas inlet, thus cutting off the flue gas passage.

[0038] As an optional technical solution in the second aspect, the fan blade is hinged to the mounting platform via a second connecting shaft; the central axis of the second connecting shaft is perpendicular to the rotation axis of the baffle, and the central axis of the first connecting shaft is parallel to the central axis of the cylinder.

[0039] As a second aspect, an optional technical solution is provided, wherein the baffle is provided with a bent portion on the side near the fan blade; the length extension direction of the bent portion is approximately parallel to the central axis of the cylinder.

[0040] Optionally, the fan blade plate is provided with an annular protrusion; the second connecting shaft is connected to the annular protrusion through a connecting plate.

[0041] As an optional technical solution in the second or fourth aspect, the fan blade is located at the connection between the base and the cylinder; the fan blade is circular and its diameter is larger than the inner diameter of the cylinder.

[0042] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0043] The temperature-sensing reaction device of this invention is easy to assemble and readily activates at high temperatures. The fan blades of this invention are angled, and the hinged end of the fan blades is located at the upper end of the flue gas passage. This prevents oil and grease buildup at the hinged end of the fan blades. The fan blades can be easily pushed open by the flue gas that needs to be exhausted, and when no more flue gas is needed, the angled fan blades can automatically fall back under gravity, thus cutting off the flue gas passage. Furthermore, the baffles and elastic elements in this application are all located at the upper end of the flue gas passage, preventing oil and grease blockage and contamination. This ensures that the baffles can hold the fan blades in place during a fire, preventing any impact on fireproof and smoke-proof performance.

[0044] Furthermore, the fan blades in this application rotate toward the flue gas inlet end to cut off the flue gas passage. When there is no need to exhaust the flue gas, the flue gas in the residential exhaust duct can push the fan blades to rotate toward the flue gas inlet end, making it less likely for the flue gas in the residential exhaust duct to backflow into the flue gas inlet end. Attached Figure Description

[0045] Figure 1 This is a three-dimensional schematic diagram of a fireproof check valve in one embodiment of this application;

[0046] Figure 2 This is a side view of a fireproof check valve in one embodiment of this application;

[0047] Figure 3 This is a schematic diagram of the smoke flow of a fireproof check valve in one embodiment of this application;

[0048] Figure 4 This is a schematic diagram of the connection between the fan blade plate and the connecting plate in one embodiment of this application;

[0049] Figure 5 This is a schematic diagram showing the connection between the first connecting piece and the second connecting piece in one embodiment of this application;

[0050] Figure 6 This is a schematic diagram showing the baffle and fan blade abutting each other in one embodiment of this application;

[0051] Figure 7 This is a schematic diagram of the mounting platform structure in one embodiment of this application;

[0052] Figure 8 This is a schematic diagram of an embodiment of the present application where the elastic element is a tension spring;

[0053] Figure 9 This is a schematic diagram of motor installation in one embodiment of this application.

[0054] Explanation of the labels in the diagram:

[0055] 101 base, 102 fan blade, 103 cylinder, 104 connecting plate, 105 second connecting shaft, 106 annular protrusion, 107 stepped surface;

[0056] Mounting platform 201, first connecting shaft 202, torsion spring 203, baffle 204, bending part 205, tension spring 206;

[0057] Insert 301, stop 302, through hole 303;

[0058] First connecting piece 401, second connecting piece 402;

[0059] Cover 501, motor 502, circuit board 503, battery 504, pressure detector 505. Detailed Implementation

[0060] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0061] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0062] In one embodiment, the present invention provides a temperature-sensing response device, including a mounting platform 201, a baffle 204, an elastic element, and a temperature-sensing material. The baffle 204 is located on one side of the mounting platform 201; for example, when the mounting platform 201 is laid flat, the baffle 204 is located under the mounting platform 201. The baffle 204 is also hinged to the mounting platform 201, meaning that the baffle 204 can rotate relative to the mounting platform 201.

[0063] The baffle 204 is also connected to the mounting platform 201 via an elastic element and is fixedly connected to the mounting platform 201 via a temperature-sensitive material.

[0064] When the temperature rises to the melting point of the temperature-sensitive material, the temperature-sensitive material melts. At this time, the baffle 204 is no longer fixed by the temperature-sensitive material. Under the elastic force of the elastic element, the baffle 204 will rotate to the unfolded state. The baffle 204 in the unfolded state will press against the fan blade plate 102, keeping the fan blade plate 102 in the closed state.

[0065] like Figure 1-3 As shown, this utility model proposes a fireproof check valve, including a valve body, a fan blade 102, a baffle 204, an elastic element, and a temperature-sensitive material. The valve body includes a seat 101 and a cylindrical body 103 connected to the seat 101. The seat 101 and the cylindrical body 103 are provided with a smoke passage. One end of the smoke passage is connected to an indoor smoke exhaust device, such as the exhaust pipe of a range hood. The other end of the smoke passage is connected to the residential exhaust duct. The smoke exhausted from the indoor smoke exhaust device passes through this fireproof check valve and then enters the residential exhaust duct for unified discharge.

[0066] The fan blade 102 is installed in the flue gas passage. By controlling the fan blade 102, the flue gas passage can be in a connected state or a cut-off state. When the flue gas passage is in a connected state, the flue gas discharged by the indoor smoke exhaust equipment can enter the residential exhaust duct through the flue gas passage. When the flue gas passage is in a cut-off state, the flue gas cannot circulate in the flue gas passage.

[0067] like Figure 3 As shown, the flue gas passage on one side of the fan blade plate 102 is the flue gas inlet end, and the flue gas passage on the other side is the flue gas outlet end. The flue gas inlet end is connected to the indoor smoke exhaust equipment. The flue gas discharged by the indoor smoke exhaust equipment enters the flue gas passage through the flue gas inlet end. After the flue gas pushes open the fan blade plate 102, the flue gas enters the residential exhaust duct through the flue gas outlet end.

[0068] In order to allow the fan blade 102 to be pushed by the smoke exhaust from the indoor smoke exhaust equipment, and also to prevent smoke from the residential exhaust duct from entering the room through the fireproof check valve, in this embodiment, the fan blade 102 is hinged to the valve body, that is, the fan blade 102 can rotate, thereby cutting off or keeping the smoke passage open.

[0069] Specifically, in this design, the upper end of the fan blade 102 is inclined towards the flue gas inlet, and the upper end of the fan blade 102 is hinged to the valve body. Thus, when the flue gas flowing from the inlet to the outlet pushes the fan blade 102 to rotate, the fan blade 102 is pushed by the flue gas to rotate towards the outlet. At this time, the fan blade 102 rotates upwards towards the flue gas passage, ensuring the flue gas passage is connected. When the indoor smoke exhaust equipment is closed and there is no flue gas flow in the passage, the fan blade 102, pushed to a higher position, will fall due to gravity, rotating towards the flue gas inlet, thereby cutting off the flue gas passage and preventing the flue gas at the outlet from flowing back into the room.

[0070] Because the upper end of the fan blade 102 is hinged to the valve body and can be easily rotated by the flue gas, while also falling back due to gravity, the installation structure of the fan blade 102 is simpler, thereby reducing the failure rate. At the same time, the hinged structure located at the upper end of the flue gas passage can also prevent oil clogging and contamination.

[0071] In the event of a fire, to block the flow of smoke, the fan blades 102 need to cut off the smoke passage and ensure that the fan blades 102 cannot rotate. In this embodiment, a baffle 204, an elastic element, and a temperature-sensitive material are provided at the upper part of the smoke exhaust end. Placing the baffle 204, the elastic element, and the temperature-sensitive material at the upper part of the smoke exhaust end, i.e., at the upper part of the smoke passage, can prevent oil stains accumulating downwards in the smoke passage from covering these components, thus avoiding oil stain blockage and contamination of these components.

[0072] Specifically, the baffle 204 is hinged to the valve body, and the baffle 204 is locked to the valve body by a temperature-sensitive material. An elastic element is installed between the baffle 204 and the valve body, and the elastic element can be in a compressed or stretched state. When the temperature rises to the melting point of the temperature-sensitive material, the temperature-sensitive material releases the locking state of the baffle 204, and the elastic element can drive the baffle 204 to rotate. The baffle 204 rotates until it abuts against the fan blade 102. The fan blade 102, which is abutted, can no longer rotate towards the smoke exhaust end, and the smoke passage is cut off by the fan blade 102. The smoke cannot flow in the smoke passage, thus achieving the function of fire prevention and smoke prevention.

[0073] In one embodiment, the valve body includes a seat 101 and a cylinder 103, with a fan blade 102 located at the connection between the seat 101 and the cylinder 103. The fan blade 102 can be circular, and its diameter is larger than the inner diameter of the cylinder 103. A stepped surface 107 is provided at the lower end of the connection between the seat 101 and the cylinder 103, allowing the fan blade 102, which rotates towards the flue gas inlet under gravity, to abut against the stepped surface 107. The larger diameter of the fan blade 102 compared to the inner diameter of the cylinder 103 allows it to completely block the flue gas passage, preventing flue gas from flowing through it.

[0074] In other embodiments, the fan blade 102 does not need to be circular; it is sufficient that the fan blade 102 can completely cover the flue gas passage inside the cylinder 103.

[0075] The flue gas passage is connected by rotating the fan blade 102 toward the flue gas discharge end. This allows the flue gas at the discharge end to push the fan blade 102 toward the flue gas inlet end, causing the fan blade 102 to press tightly against the connection between the base 101 and the cylinder 103, thus cutting off the flue gas passage. This prevents the flue gas in the residential exhaust duct from entering the flue gas inlet end through the flue gas passage, thereby preventing the flue gas from flowing back into the room.

[0076] To improve the isolation effect of the fan blade 102 on flue gas, a sealing gasket, such as a rubber sealing ring, can be installed on the end face of the fan blade 102 near the cylinder 103. This is a relatively mature technology in the prior art and will not be limited or elaborated here.

[0077] Regarding the hinged structure of the fan blade 102 and the baffle 204, in one embodiment, such as Figure 7 As shown, the mounting platform 201 is connected to the base 101. The mounting platform 201 can be connected to the base 101 by bolts and nuts, so the mounting platform 201 is detachable. The mounting platform 201 can also be connected to the base 101 by welding, or the mounting platform 201 can be integrally formed with the base 201.

[0078] The baffle 204 is hinged to the mounting platform 201 via the first connecting shaft 202, and the fan blade 102 is hinged to the mounting platform 201 via the second connecting shaft 105. For example... Figure 6 As shown, the first connecting shaft 202 is perpendicular to the second connecting shaft 105, and the central axis of the first connecting shaft 202 is parallel to the central axis of the cylinder 103. By making the first connecting shaft 202 perpendicular to the second connecting shaft 105, when the baffle 204 abuts against the fan blade 102, the force of the flue gas acting on the fan blade 102 is transmitted to the baffle 204, and this force will not cause the baffle 204 to rotate, that is, the baffle 204 can firmly hold the fan blade 102 against it.

[0079] Since the fan blade 102 is inclined and the radial space within the base 101 is limited, the size of the baffle 204 is restricted. To ensure that the baffle 204, despite its relatively short length, can still abut against the fan blade 102, in this design, as shown... Figure 6 As shown, one end of the baffle 204 is hinged to the mounting platform 201 via the first connecting shaft 202, and the other end is provided with a bending part 205. The length extension direction of the bending part 205 is parallel to the central axis of the cylinder 103, that is, the bending part 205 extends axially. In this way, under the premise that the radial length of the baffle 204 is relatively short, the fan blade 102 can be held in place by the bending part 205.

[0080] The melting point of the temperature-sensitive material is 120℃~190℃, for example, 150℃. Various metals or alloys, or other types of materials, can be used; no restrictions are placed here.

[0081] Regarding the method of setting the temperature-sensing material, in one embodiment, such as Figure 4 As shown, the baffle 204 is provided with an insert 301, and the mounting platform 201 is provided with a through hole 303 for the insert 301 to pass through. The insert 301 passing through the through hole 303 is fitted with a stop 302, which abuts against the mounting platform 201, preventing the insert 301 from exiting the through hole 303, thereby fixing the baffle 204.

[0082] The stop 302 is made of a temperature-sensitive material. Optionally, the temperature-sensitive material can be a tin alloy, in which case the stop 302 can be made of the tin alloy into a column or block shape.

[0083] Regarding the placement of the temperature-sensing material, in another embodiment, such as... Figure 5 As shown, the mounting platform 201 is connected to a first connecting piece 401, and the baffle 204 is connected to a second connecting piece 402. The first connecting piece 401 and the second connecting piece 402 are connected by a temperature-sensitive material. Optionally, the temperature-sensitive material can be solder with a melting point of 150°C. When the temperature reaches the solder's melting point, the solder melts, the first connecting piece 401 and the second connecting piece 402 are disconnected, and the elastic element drives the baffle 204 to rotate until it abuts against the fan blade plate 102.

[0084] In one embodiment, the elastic element is a torsion spring 203, which is mounted on the first connecting shaft 202. The torsion spring 203 has two extensions; this type of torsion spring 203 structure is relatively mature in the prior art and will not be described in detail here. The torsion spring 203 has two extensions, which respectively abut against the baffle 204 and the mounting platform 201. When the baffle 204 is in the locked state, the torsion spring 203 is in a torsional state; when the baffle 204 is unlocked, the torsion spring 203 applies a spring force to the baffle 204, causing the baffle 204 to rotate until it abuts against the fan blade 102, preventing the fan blade 102 from opening.

[0085] For elastic elements, in another embodiment, such as Figure 8 As shown, the elastic element is a tension spring 206, with its two ends connected to the baffle 204 and the mounting platform 201, respectively. When the baffle 204 is in the locked state, the tension spring 206 is in the stretched state; when the baffle 204 is unlocked, the tension spring 206 applies a pulling force to the baffle 204, causing the baffle 204 to rotate until it abuts against the fan blade 102, preventing the fan blade 102 from opening.

[0086] It should be noted that tension spring 206 and torsion spring 203 can also be installed at the same time. That is, after the baffle 204 is unlocked, the torsion spring 203 and tension spring 206 work together to make the baffle 204 rotate to abut against the fan blade plate 102, so that the fan blade plate 102 cannot be opened.

[0087] To improve the structural strength of the fan blade 102 and prevent the fan blade 102 from deforming and causing a decrease in its insulation effect, in one embodiment, such as Figure 1 , 3 As shown, the fan blade 102 is provided with an annular protrusion 106, through which the second connecting shaft 105 is connected to the annular protrusion 106 via a connecting plate 104. The annular protrusion 106 improves the overall structural strength of the fan blade 102, thereby preventing deformation of the fan blade 102.

[0088] In one embodiment, this application proposes a temperature-sensing response device, including a motor 502, a temperature-sensing element, and a circuit board 503.

[0089] The motor 502 is connected to the fan blade 102 for transmission, driving the fan blade 102 to rotate, so that the fan blade 102 is in an open or closed state.

[0090] Circuit board 503 is electrically connected to the range hood, motor 502, and temperature sensing element to determine whether the range hood is on. Note that the method used by circuit board 503 to determine whether the range hood is on is a prior art method and will not be described further here. When the range hood is on, motor 502 drives fan blade 102 to rotate to the open state; when the range hood is off, motor 502 drives fan blade 102 to rotate to the closed state.

[0091] The temperature sensing element is electrically connected to the circuit board 503 and is used to detect the temperature. When the temperature reaches a set value, such as exceeding 120°C, the motor 502 can drive the fan blade 102 to rotate to the closed state.

[0092] This utility model also proposes a fireproof check valve, such as Figure 9 As shown, the device includes a valve body, fan blades, a motor 502, a circuit board 503, and a temperature sensing element. The valve body includes a seat 101 and a cylinder 103 connected to the seat 101. The seat 101 and cylinder 103 are provided with a smoke passage. One end of the smoke passage is connected to an indoor smoke exhaust device, such as the exhaust pipe of a range hood. The other end of the smoke passage is connected to the residential exhaust duct. The smoke discharged from the indoor smoke exhaust device passes through this fireproof check valve and then enters the residential exhaust duct for unified discharge.

[0093] The fan blade 102 is installed in the flue gas passage. One side of the flue gas passage is the flue gas inlet, and the other side is the flue gas outlet. The flue gas inlet is connected to the indoor smoke exhaust equipment. The flue gas discharged from the indoor smoke exhaust equipment enters the flue gas passage through the flue gas inlet. When the fan blade 102 is in the open state, that is, when the flue gas passage is in the connected state, the flue gas then enters the residential exhaust duct through the flue gas outlet.

[0094] The motor 502 is mounted on the valve body and can drive the fan blade 102 to rotate. That is, the output shaft of the motor 502 is connected to the fan blade 102, so when the motor 502 rotates forward or in reverse, it can drive the fan blade 102 to open or close.

[0095] In this design, the motor 502, circuit board 503, and temperature sensor are all located above the flue gas passage. This prevents oil stains from accumulating below the flue gas passage and contaminating or damaging the motor 502, circuit board 503, and temperature sensor. As a preferred design, the motor 502 and circuit board 503 are located outside the valve body, while the temperature sensor is located inside the flue gas passage. The output shaft of the motor 502 passes through a through-hole in the valve body and then connects to the fan blade 102.

[0096] To prevent dust from affecting the motor 502 and circuit board 503, a cover 501 can be installed on the valve body, and the motor 502 and circuit board 503 can be placed inside the cover 501, thereby protecting the motor 502 and circuit board 503 through the cover 501.

[0097] Circuit board 503 is electrically connected to motor 502 and is used to control the starting and stopping of motor 502 and its running time. Circuit board 503 is also electrically connected to range hood to collect the operating current of range hood. The method by which circuit board 503 achieves the above control is relatively mature in the existing technology and will not be described in detail here.

[0098] When the range hood is turned on, i.e., after the range hood generates operating current, the circuit board 503 controls the motor 502 to drive the fan blades 102 to rotate towards the exhaust end, thus connecting the exhaust duct. When the range hood is turned off, the circuit board 503 does not detect the operating current of the range hood, and the circuit board 503 controls the motor 502 to drive the fan blades 102 to rotate towards the exhaust inlet end, thus cutting off the exhaust duct.

[0099] The temperature sensing element is electrically connected to the circuit board 503 and detects the temperature of the smoke passage. When a fire occurs, the temperature inside the smoke passage rises. The temperature sensing element detects this rise, and when the collected temperature reaches a set value, such as 150°C, the motor 502 drives the fan blade 102 to rotate towards the smoke inlet, thus cutting off the smoke passage.

[0100] The upper end of the fan blade 102 is inclined toward the flue gas inlet. In this way, when the fan blade 102 is in the closed state, that is, when the flue gas passage is cut off, the influence of gravity on the fan blade 102 can be used to keep the fan blade 102 stably in the closed state and prevent flue gas leakage.

[0101] Optionally, a battery 504 is also provided under the cover 501, which can supply power to the circuit board 503, motor 502 and temperature sensing element. In this way, even if a fire causes a power outage, the battery 504 can still be used to shut down the fan blade 102.

[0102] As an optional solution, the fireproof check valve in the above embodiment also includes a pressure detector 505. This pressure detector 505 is installed inside the smoke duct and can detect the internal air pressure of the smoke duct. The pressure detector 505 can also be electrically connected to a circuit board 503, which is in turn electrically connected to an indicator light. If a problem with poor smoke extraction occurs, the technician can judge the internal pressure of the smoke duct by the flashing frequency of the indicator light. For example, 10 flashes in 10 seconds indicates an internal pressure greater than 1000 Pa, and 1 flash in 10 seconds indicates an internal pressure greater than 100 Pa. Generally, if the internal pressure of the smoke duct is greater than 300 Pa, smoke extraction is basically impossible, indicating a problem with the pipes rather than the range hood. Therefore, the reason for the inability to extract smoke can be easily determined by observing the indicator light.

[0103] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A temperature-sensing reaction device, characterized in that, Includes mounting platform (201), baffle (204), elastic element, and temperature-sensitive material; in: The baffle (204) is located on one side of the mounting platform (201) and is hinged to the mounting platform (201); The baffle (204) is also connected to the mounting platform (201) via an elastic element and is fixedly connected to the mounting platform (201) via a temperature-sensitive material; When the temperature rises to the melting point of the temperature-sensitive material, the temperature-sensitive material melts, and the elastic force of the elastic element causes the baffle (204) to rotate to the open state. The baffle (204) presses against the fan blade plate (102) to keep the fan blade plate (102) in the closed state.

2. The temperature-sensing reaction device according to claim 1, characterized in that: The baffle (204) is provided with a insert (301); the mounting platform (201) is provided with a through hole (303) for the insert (301) to pass through; A mounting block (302) is installed through the through hole (303) and the mounting plate (201) abuts against it; The stop (302) is made of the temperature-sensitive material.

3. The temperature-sensing reaction device according to claim 1, characterized in that: The mounting platform (201) is connected to a first connecting piece (401), and the baffle (204) is connected to a second connecting piece (402); The first connecting piece (401) and the second connecting piece (402) are connected by a temperature-sensitive material.

4. The temperature-sensing reaction device according to claim 2 or 3, characterized in that: The temperature-sensitive material has a melting point of 120℃~190℃.

5. The temperature-sensing reaction device according to claim 1, characterized in that: The baffle (204) is hinged to the mounting platform (201) via the first connecting shaft (202); The elastic element is a torsion spring (203), which is sleeved on the first connecting shaft (202); the two extensions of the torsion spring (203) abut against the baffle (204) and the mounting platform (201) respectively; And / or: The elastic element is a tension spring (206), and the two ends of the tension spring (206) are connected to the baffle (204) and the mounting platform (201) respectively.

6. A fireproof check valve, characterized in that, include: The valve body includes a seat (101) and a cylinder (103) connected to the seat (101). The seat (101) and the cylinder (103) are provided with flue gas passages. The fan blade (102) is located in the flue gas passage; the flue gas passage on one side of the fan blade (102) is the flue gas inlet end, and the flue gas passage on the other side is the flue gas outlet end. The upper end of the fan blade (102) is inclined toward the flue gas inlet end and is hinged to the valve body; the fan blade (102) can be pushed by the flue gas to rotate toward the flue gas outlet end, so that the flue gas passage is in a connected state; or, the fan blade (102) can be rotated toward the flue gas inlet end by gravity, so that the flue gas passage is in a cut-off state. The upper part of the flue gas discharge end is provided with a temperature sensing reaction device as described in any one of claims 1-5; The mounting platform (201) is connected to the valve body; when the baffle (204) is rotated to the unfolded state, the baffle (204) abuts against the fan blade (102), so that the flue gas passage is cut off.

7. The fireproof check valve according to claim 6, characterized in that: The fan blade (102) is hinged to the mounting platform (201) via the second connecting shaft (105); the central axis of the second connecting shaft (105) is perpendicular to the central axis of the first connecting shaft (202), and the central axis of the first connecting shaft (202) is parallel to the central axis of the cylinder (103).

8. The fireproof check valve according to claim 7, characterized in that: The fan blade plate (102) is provided with an annular protrusion (106); The second connecting shaft (105) is connected to the annular protrusion (106) via the connecting plate (104).

9. The fireproof check valve according to claim 6, characterized in that: The baffle (204) has a bent portion (205) on the side near the fan blade (102); the length extension direction of the bent portion (205) is approximately parallel to the central axis of the cylinder (103).

10. A temperature-sensing reaction device, characterized in that, Includes a motor (502), a temperature sensing element, and a circuit board (503); in: The motor (502) is used to drive the fan blade (102) to rotate to the open or closed state; The circuit board (503) is used to electrically connect with the range hood, motor (502), and temperature sensing element to determine whether the range hood is turned on. When the range hood is turned on, the motor (502) drives the fan blade (102) to rotate to the open state. When the range hood is turned off, the motor (502) drives the fan blade (102) to rotate to the closed state. The temperature sensing element is electrically connected to the circuit board (503) and is used to detect the temperature; when the temperature exceeds 120°C, the motor (502) can drive the fan blade (102) to rotate to the closed state.

11. The temperature-sensing reaction device according to claim 10, characterized in that: It also includes a battery (504) that supplies power to the circuit board (503), the motor (502) and the temperature sensing element.

12. A fireproof check valve, characterized in that, include: The valve body includes a seat (101) and a cylinder (103) connected to the seat (101). The seat (101) and the cylinder (103) are provided with flue gas passages. The fan blade (102) is located in the flue gas passage; the flue gas passage on one side of the fan blade (102) is the flue gas inlet end, and the flue gas passage on the other side is the flue gas outlet end; the upper end of the fan blade (102) is inclined towards the flue gas inlet end. The upper part of the flue gas discharge end is provided with a temperature sensing reaction device as described in any one of claims 10-11; The motor (502) is mounted on the valve body; When the motor (502) drives the fan blade (102) to rotate to the open state, the fan blade (102) rotates toward the flue gas discharge end, so that the flue gas passage is in the connected state; When the motor (502) drives the fan blade (102) to rotate to the closed state, the fan blade (102) rotates toward the flue gas inlet end, so that the flue gas passage is cut off.

13. The fireproof check valve according to claim 12, characterized in that: The fan blade (102) is located at the connection between the base (101) and the cylinder (103); The fan blade (102) is circular, and its diameter is larger than the inner diameter of the cylinder (103).

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