Fire check valve with butterfly fire temperature sensing device

Abstract

The present invention discloses a fireproof check valve with a butterfly-shaped fireproof temperature sensing device, including a metal cylinder, a check door plate symmetrically located in the metal cylinder and capable of opening, and a butterfly-shaped fireproof temperature sensing device located in the metal cylinder and above the symmetry axis of the two check door plates, wherein the butterfly-shaped fireproof temperature sensing device includes a crossbeam spanning the valve body opening and having an upwardly protruding bow structure in the middle, and a positioning shaft passing through the bow structure, wherein two rotating arms and a torsion spring are symmetrically passed through the positioning shaft, wherein one end of the torsion spring abuts against the rotating arm, and the other end abuts against the bow structure, and the two rotating arms are connected by two bonded fuse pieces. The present invention utilizes the design of the torsion spring and the rotating arm, and when the rotating arm rotates along the positioning shaft under the torsion force of the torsion spring, in the initial state, it rotates upward away from the check door plate and then rotates downward to be pressed against the check door plate, so that the valve is tightly closed to realize the fireproof isolation function.

Description

Technical Field

[0001] The invention relates to a check valve, in particular to a fireproof check valve with a butterfly-shaped fireproof temperature sensing device. Background Art

[0002] The check valve used for public flue or external wall direct discharge has put forward higher requirements on the opening effect, fireproof performance, sealing effect, etc. of the check door plate, but the currently used check valves have many defects. For example, the check door plate rotates around the connecting shaft. Since the contact surface of the connecting shaft is large, it is easy to be stained with oil. During use, the check door plate is often stuck during the rotation process, so that it can only be partially opened, not fully opened or completely returned to its original position, thereby affecting the ventilation effect and the effect of preventing smoke backflow in the same period of time; in addition, although a fire prevention device is set, it has a complex structure, high production cost, and is easy to fail, and has poor fireproof performance; at the same time, the phenomenon of odor cross-over in the flue occurs from time to time, and the room is full of odor, which seriously affects the health of family members.

[0003] Therefore, it is urgent to solve the above problems. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to provide a fire-proof check valve with a butterfly-shaped fire-proof temperature sensing device which has reliable performance and is not prone to failure.

[0005] Technical solution: To achieve the above objectives, the present invention discloses a fireproof check valve with a butterfly-shaped fireproof temperature sensing device, comprising a metal cylinder, a check door plate symmetrically located in the metal cylinder and capable of opening opposite to each other, and a butterfly-shaped fireproof temperature sensing device located in the metal cylinder and above the symmetry axis of the two check door plates, wherein the butterfly-shaped fireproof temperature sensing device comprises a crossbeam spanning the valve body opening and having an upwardly protruding bow structure in the middle, and a positioning shaft passing through the bow structure, wherein two rotating arms rotatable around the positioning shaft and torsion springs corresponding to the rotating arms are symmetrically passed through the positioning shaft, wherein one end of the torsion spring abuts against the rotating arm and the other end abuts against the bow structure, and at the same time, the two rotating arms are connected by two bonded fuse pieces; when the external temperature reaches a certain temperature, the two bonded fuse pieces are separated, and the rotating arm that rotates upward away from the check door plate in the initial state rotates downward around the positioning shaft under the torsion force of the torsion spring and is pressed onto the check door plate, so that the valve is closed to realize the fireproof isolation function. The present invention utilizes the design of a torsion spring and a rotating arm. When the rotating arm rotates along the positioning axis under the torsion force of the torsion spring, it rotates upward away from the check door plate in the initial state and then rotates downward to be pressed onto the check door plate, so that the valve is tightly closed to realize the fire isolation function.

[0006] Wherein, the arch structure is connected with a positioning member for limiting the rotating arm and movable along the arch structure, the positioning member comprises a positioning plate, a positioning groove on the positioning plate, a positioning rod for driving the positioning member to move, and a one-way positioning piece obliquely arranged on the positioning plate and corresponding to the rotating arm, the rotating arm has a one-way positioning tooth groove engaged with the one-way positioning piece, the arch structure is provided with a guide groove for guiding the positioning rod and a positioning hole for connecting and fixing the positioning plate, and bolts are passed through the positioning hole and the positioning groove; during the downward rotation of the rotating arm, the one-way positioning piece slides in one direction along the one-way positioning tooth groove, and when the rotating arm stops rotating and is pressed against the non-return door plate, the one-way positioning piece is engaged in the one-way positioning tooth groove, and the rotating arm is one-way limited and stuck. The present invention utilizes a combined structural design in which the one-way positioning piece on the positioning member movable along the crossbeam is engaged with the one-way positioning tooth groove on the rotating arm, so as to realize the limiting and stuck function of the rotating arm, and avoid the impact force generated by the flue driving the rotating arm to rotate, thereby opening the non-return door plate.

[0007] Preferably, the arched structure and the positioning member are respectively provided with a reserved positioning hole and a reserved positioning groove for passing bolts for fixing.

[0008] Furthermore, a claw is provided at the front end of the rotating arm, and a slot matching the claw is provided on the non-return door plate.

[0009] Furthermore, the rotating arm is provided with an auxiliary claw located at the rear side of the claw. The present invention utilizes the claw and the auxiliary claw to form two pressing forces on the non-return door plate, so that the non-return door plate is closed more tightly.

[0010] Preferably, a connecting groove for connecting the fuse piece is formed on the rotating arm, and the fuse piece comprises a connecting portion inserted into the connecting groove, an adhesive portion for bonding, and a transition portion for connecting the adhesive portion and the connecting portion.

[0011] Furthermore, a metal check door frame is obliquely arranged on the inner wall or the end of the metal cylinder, and two check door panels are symmetrically arranged on the metal check door frame.

[0012] Furthermore, the metal cylinder includes an upper cylinder and a lower cylinder which are arranged mutually, a protrusion is provided on the upper cylinder, and an L-shaped groove is provided at a corresponding position on the lower cylinder. The lower cylinder is inserted into the upper cylinder, and the protrusion is inserted into the longitudinal groove of the L-shaped groove. The upper cylinder or the lower cylinder is rotated, and the protrusion is stuck in the transverse groove of the L-shaped groove and locked.

[0013] Preferably, a metal mounting seat is provided at one end of the lower cylinder, and the metal mounting seat and the lower cylinder are a welded structure or an integrally formed structure.

[0014] Furthermore, the metal cylinder is an integrally formed structure, one end of the metal cylinder is provided with a metal mounting seat, and the metal mounting seat and the metal cylinder are a welded structure or an integrally formed structure.

[0015] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0016] (1) The present invention utilizes the design of a torsion spring and a rotating arm. When the rotating arm rotates along the positioning axis under the torsion force of the torsion spring, it rotates upward away from the check door plate in the initial state and then rotates downward to press against the check door plate, so that the valve is tightly closed to realize the fire isolation function;

[0017] (2) The check door plate of the present invention is obliquely arranged in the metal cylinder, and the inclined gravity generated by the double-open check door plate is conducive to the valve closing, so as to ensure that the two check door plates are in a closed state when the check valve is not in use;

[0018] (3) The metal cylinder of the present invention is a split cylinder, which is formed by an upper cylinder and a lower cylinder that are mutually sleeved. When the check valve needs to be cleaned during use, only the upper cylinder needs to be disassembled, and there is no need to disassemble the lower cylinder fixed to the flue, which reduces the difficulty of cleaning the check valve. The split type is convenient for installation and cleaning, and at the same time reduces the scrap rate of the cylinder during product production;

[0019] (4) The present invention utilizes a combined structural design in which a one-way positioning piece on a positioning member that can move along the crossbeam engages with a one-way positioning tooth groove on a rotating arm to achieve a one-way limit locking function of the rotating arm, thereby preventing the impact force generated by the flue from driving the rotating arm to rotate, thereby opening the non-return door panel;

[0020] (5) The present invention utilizes the clamping claw and the auxiliary clamping claw to form two pressing forces on the non-return door plate, so that the non-return door plate can be closed more tightly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the fire check valve in Example 1 of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the fire prevention temperature sensing device in Example 1 of the present invention;

[0023] Figure 3 This is a schematic diagram of the connection between the crossbeam and the positioning member in Example 1 of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the positioning member in Example 1 of the present invention;

[0025] Figure 5 This is a schematic diagram of the connection between the rotating arm and the torsion spring in Example 1 of the present invention;

[0026] Figure 6 This is a schematic diagram of the structure of the metal cylinder in Example 1 of the present invention;

[0027] Figure 7This is a schematic diagram of the structure of the fire check valve in the closed state in Example 1 of the present invention;

[0028] Figure 8 This is a schematic diagram of the structure of the fire prevention temperature sensing device in the closed state in Example 1 of the present invention;

[0029] Fig. 9 This is a schematic diagram of the installation of the non-return door panel in Embodiment 1 of the present invention;

[0030] Fig.10 This is a schematic structural diagram of a non-return door plate in Embodiment 1 of the present invention;

[0031] Fig.11 It is a top view of the non-return door plate in Example 1 of the present invention;

[0032] Fig.12 This is a schematic diagram of the structure of the metal cylinder in Example 2 of the present invention;

[0033] Fig.13 This is a schematic diagram of the structure of the fire check valve in Example 3 of the present invention;

[0034] Fig.14 This is a schematic diagram of the structure of the metal cylinder in Example 3 of the present invention;

[0035] Fig.15 This is a schematic diagram of the connection of the reducer sleeve in Example 3 of the present invention;

[0036] Fig.16 This is a schematic diagram of the structure of the fire check valve in the closed state in Example 3 of the present invention. DETAILED DESCRIPTION

[0037] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0038] Example 1

[0039] like Figure 1 and Figure 2 As shown, the present invention discloses a fireproof check valve with a butterfly-shaped fireproof temperature sensing device, comprising a metal cylinder 1, a check door plate 2, a butterfly-shaped fireproof temperature sensing device, a metal check door frame 10 and a metal mounting seat 11.

[0040] like Figure 6As shown, the metal cylinder 1 includes an upper cylinder 101 and a lower cylinder 102 which are sleeved with each other. A convex block 103 is provided on the upper cylinder 101, and an L-shaped groove 104 is provided at a corresponding position on the lower cylinder 102. The lower cylinder 102 is inserted into the upper cylinder 101, and the convex block 103 is inserted into the longitudinal groove of the L-shaped groove 104. The upper cylinder 101 or the lower cylinder 102 is rotated, and the convex block 103 is stuck in the transverse groove of the L-shaped groove 104 and locked. A metal mounting seat 11 is provided at one end of the lower cylinder 102. The metal mounting seat 11 and the lower cylinder 102 are welded or integrally formed structures. A connecting U-shaped groove or waist-shaped hole is provided on the metal mounting seat 11 so that the check valve can be fixedly installed by installing expansion screws or by other methods. Among them, the metal cylinder 1 adopts a structure in which the upper cylinder and the lower cylinder are nested with each other, which avoids the problem of high scrap rate of the cylinder during product production caused by multiple stretching forming processes. At the same time, when the check valve needs to be cleaned during use, it is only necessary to disassemble the upper cylinder without disassembling the lower cylinder fixed to the flue, thereby reducing the difficulty of cleaning the check valve. The split type is easy to install and clean.

[0041] like Fig. 9 , Fig.10 and Fig.11As shown, the inner wall of the upper cylinder 101 of the metal cylinder 1 is obliquely provided with a metal check door frame 10, and two check door panels 2 are symmetrically arranged on the metal check door frame 10. The metal check door frame 10 includes a circular frame 1001 fixed to the inner wall of the metal cylinder and a central door frame 1002 located at the symmetry axis of the circular frame, and the side edges of the circular frame 1001 and the central door frame 1002 are blade-shaped side edges, and the blade-shaped side edges and the blade-shaped of the check door panels are effectively sealed through a D-shaped silicone sealing ring 204. The check door panel 2 includes an upper door panel 202 and a lower door panel 203, and a card slot 201 adapted to the claw 502 is provided on the upper door panel 202 of the check door panel 2. The peripheries of the upper door panel 202 and the lower door panel 203 are both stamped into a blade shape, and the upper door panel 202 and the lower door panel 203 are fixedly connected to each other by rivets or bolts. A D-shaped silicone sealing ring 204 for sealing the valve body opening is buckled around the upper door plate 202 and the lower door plate 203. The upper door plate 202 and the lower door plate 203 are both D-shaped metal plates, and the D-shaped metal plate includes a straight side and an arc side. The two end positions of the straight side of the upper door plate 202 are bent around themselves to form a central door axis 205, and the upper door plate 202 drives the lower door plate to rotate around the central door axis 205 formed by bending itself. Hinges 12 are respectively provided on the valve body near the two ends of the central door axis 205, and the hinges 12 are provided with fixing buckles 13 for fixing the central door axis 205, and the upper door plate 202 is connected to the hinge 12 and the fixing buckle 13 on the valve body through the central door axis 205. The non-return door plate 2 can achieve flexible rotation through the central door axis formed by bending itself, reducing the influence of oil or dust on the rotation flexibility during use. The design is ingenious, can be fully opened and closed, and the ventilation effect is improved. The plane of the check door plate 2 has an angle of 25-40° with the vertical direction to ensure that when the fire check valve and its butterfly-shaped fireproof temperature sensing device are not in use, the two check door plates lean against the metal check door frame 10 due to the effect of gravity, thereby, the fire check valve with the butterfly-shaped fireproof temperature sensing device is in a closed state.

[0042] The butterfly-shaped fireproof temperature sensing device is located inside the metal cylinder 1 and above the symmetry axis of the two check door panels 2. The butterfly-shaped fireproof temperature sensing device is centered and does not affect the movement of the check door panels 2. At the same time, the height of the metal cylinder 1 can fully accommodate the check door panels 2 in the open state, protecting the fireproof temperature sensing device from damage and enhancing its fireproof reliability. At the same time, it prevents strong winds and foreign objects in the flue or on the outer wall from hindering the opening of the metal check door panels, further ensuring the reliability of the fireproof check valve with a butterfly-shaped fireproof temperature sensing device and its fireproof temperature sensing device.

[0043] The butterfly-shaped fireproof temperature sensing device includes a crossbeam 3, a positioning shaft 4, a rotating arm 5, a torsion spring 6, a fuse 7, a positioning member 8, a bolt 9 and a spacer 14. The crossbeam 3 is a bending plate across the valve body opening, and the bending plate includes a crossbeam connecting portion 305 fixed to the inner side of the upper cylinder 101 of the metal cylinder 1 and a crossbeam portion 306 parallel to the symmetry axis of the check valve plate. The crossbeam portion 306 has an upwardly protruding arch structure 301, and the side of the crossbeam 3 in the length direction is provided with a folded edge 307 for reinforcement. The positioning shaft 4 is penetrated in the arch structure 301 and fixed by a latch 15, and two rotating arms 5 are symmetrically penetrated on the positioning shaft 4. At the same time, a spacer 14 is also penetrated on the positioning shaft 4 located between the two rotating arms 5, and the spacer 14 can isolate the two rotating arms to prevent the rotating arms from interfering with each other. The rotating arm 5 includes a rotating plate 505 and connecting ears 506 located on both sides of the rotating plate 505 for passing the positioning shaft 4. The connecting ears 506 close to the other rotating arm 5 are provided with a one-way positioning tooth groove 501 for limiting the rotating arm. Figure 5 As shown, a claw 502 is provided at the front end of the rotating plate 505, and an auxiliary claw 503 is also provided on the rotating plate 505 located at the rear side of the claw 502. A connecting groove 504 for connecting the fuse piece 7 is also provided on the rotating plate 505. The torsion spring 6 is passed through the positioning shaft 4 located between the connecting ears on both sides of the rotating arm 5. One end of the torsion spring 6 abuts on the rotating plate 505, and the other end abuts on the bow structure 301. One end of the two fuse pieces 7 are bonded to each other, and the other ends are respectively connected to the connecting grooves 504 of the rotating arm 5. The fuse piece 7 includes a connecting portion 701 inserted into the connecting groove 504, an adhesive portion 702 for bonding, and a transition portion 703 for connecting the adhesive portion and the connecting portion. The fuse piece here uses a copper sheet or a steel sheet, and has a standard melting point temperature control, which meets the national fire department approval standards. When the operating temperature reaches the melting temperature, the fuse piece is disconnected, and the temperature control is precise and the response is sensitive. As shown Figure 3 As shown, the arched structure 301 is connected with a positioning member 8 that can move along the arched structure and is used to limit the rotation arm. Figure 4 As shown, the positioning member 8 includes a positioning plate 801, a positioning groove 802 located on the positioning plate, a reserved positioning groove 805 located on the positioning plate, a positioning rod 803 for driving the positioning member to move, and a one-way positioning piece 804 obliquely arranged on the positioning plate and corresponding to the one-way positioning tooth groove 501 on the rotating arm. The bow-shaped structure 301 is provided with a guide groove 302 for guiding the positioning rod, a positioning hole 303 for connecting and fixing the positioning plate, and a reserved positioning hole 304 for passing bolts for fixing. Bolts 9 are passed through the positioning hole 303 and the positioning groove 802. During the downward rotation of the rotating arm, the one-way positioning piece slides in one direction along the one-way positioning tooth groove. When the rotating arm stops rotating and is pressed against the non-return door plate, the one-way positioning piece is engaged in the one-way positioning tooth groove, and the rotating arm is stuck in the one-way limit, as shown in FIG. Figure 7 and Figure 8As shown; if it is necessary to reset the rotating arm to the initial state, pull the positioning rod to move the positioning piece until the one-way positioning piece is disengaged from the one-way positioning tooth groove, rotate the rotating arm upward to reset, and then pull the positioning rod to move the positioning piece back to the initial state.

[0044] Working process: First, install the fire check valve with butterfly fire temperature sensor on the wall and adjust its installation position. When the fire check valve with butterfly fire temperature sensor is opened, the two check door panels are fully opened to discharge the exhaust gas; when the fire check valve with butterfly fire temperature sensor is closed, the check door panel falls back on the metal check door frame by its own gravity; when the temperature in the flue is too high, the two bonded fuses are separated, and the rotating arm that rotates upward away from the check door panel in the initial state rotates downward around the positioning axis under the torsion of the torsion spring and is pressed on the check door panel, and is locked by the positioning piece, and the check door panel is firmly closed to prevent the spread of fire.

[0045] Product uses are as follows:

[0046] Can be used in public flues: The fire check valve with a butterfly-shaped fire-proof temperature-sensing device is used for exhausting oil smoke in public flues in home kitchens, preventing smoke backflow, fire prevention systems, kitchen range hood exhaust, and public flue fire prevention. It is usually in the "normally closed" state to prevent odors from the public flue, eliminate odor cross-talk, and protect the health of your family. When the range hood is working, the fire check valve with a butterfly-shaped fire-proof temperature-sensing device and its fire-proof temperature-sensing device door panel are wide open and in the "open" state. The large diameter ensures unobstructed smoke exhaust. When the air temperature reaches the fuse temperature, the fuse of the fire check valve with a butterfly-shaped fire-proof temperature-sensing device will actuate and automatically close to prevent external fire damage.

[0047] Can also be used on exterior walls: Fire check valves with butterfly-shaped fireproof temperature sensing devices are used for direct discharge on exterior walls, which can effectively prevent small animals, birds, sand and dust from entering the range hood.

[0048] Example 2

[0049] like Fig.12 As shown, the structure of Example 2 is the same as that of Example 1, except that the metal cylinder 1 is an integrally formed structure, a metal mounting seat 11 is provided at one end of the metal cylinder 1, and the metal mounting seat 11 and the metal cylinder 1 are a welded structure or an integrally formed structure.

[0050] Example 3

[0051] like Fig.13 , Fig.14 , Fig.15 and Fig.16As shown, the structure of Example 3 is the same as that of Example 1, except that: a metal non-return door frame 10 is obliquely provided at the end of the upper cylinder 101 of the metal cylinder 1, and two non-return door panels 2 are symmetrically arranged on the metal non-return door frame 10. When in use, a reducing sleeve 16 is sleeved on the upper cylinder 101 of the metal cylinder 1 for connecting to the wall. In addition, both ends of the crossbeam connection portion 305 are fixedly connected to the metal mounting seat 11. A clamping plate 17 is connected to the upper door panel 202 of the double-opening door panel 2, and a clamping groove 201 adapted to the clamping claw 502 is arranged on the clamping plate 17.

Claims

1. A fire-proof check valve with a butterfly-shaped fire-proof temperature sensing device, characterized in that: The invention comprises a metal cylinder (1), a check door plate (2) symmetrically located in the metal cylinder and capable of opening opposite to each other, and a butterfly-shaped fireproof temperature sensing device located in the metal cylinder and above the symmetry axis of the two check door plates, wherein the butterfly-shaped fireproof temperature sensing device comprises a crossbeam (3) spanning the valve body opening and having an upwardly protruding arched structure (301) in the middle, and a positioning shaft (4) passing through the arched structure (301), wherein two rotating arms (5) symmetrically passing through the positioning shaft (4) and capable of rotating around the positioning shaft and corresponding to the rotating arms A torsion spring (6) is provided, one end of the torsion spring (6) abuts against the rotating arm (5), and the other end abuts against the bow-shaped structure (301), and at the same time, the two rotating arms (5) are connected by two bonded fuse pieces (7); when the external temperature reaches a certain temperature, the two bonded fuse pieces separate, and the rotating arm that rotates upward away from the non-return door plate in the initial state rotates downward around the positioning axis under the torsion force of the torsion spring and is pressed against the non-return door plate, so that the valve is closed to realize the fire isolation function; the bow-shaped structure (301 ) is connected to a positioning member (8) for limiting the rotation arm and movable along the arch structure, the positioning member (8) comprising a positioning plate (801), a positioning groove (802) located on the positioning plate, a positioning rod (803) for driving the positioning member to move, and a one-way positioning piece (804) obliquely arranged on the positioning plate and corresponding to the rotation arm one by one, the rotation arm (5) has a one-way positioning tooth groove (501) engaged with the one-way positioning piece, and the arch structure (301) is provided with a guide groove (303) for guiding the positioning rod. 02) and a positioning hole (303) for connecting and fixing the positioning plate, the positioning hole (303) and the positioning groove (802) are penetrated by bolts (9); during the downward rotation of the rotating arm, the one-way positioning piece slides in one direction along the one-way positioning tooth groove, and when the rotating arm stops rotating and is pressed against the non-return door plate, the one-way positioning piece is engaged in the one-way positioning tooth groove, and the rotating arm is locked in the one-way limit; the front end of the rotating arm (5) is provided with a clamping claw (502), and the non-return door plate (2) is provided with a clamping groove (201) adapted to the clamping claw.

2. The fire-proof check valve with a butterfly-shaped fire-proof temperature sensing device according to claim 1 is characterized in that: The arched structure (301) and the positioning member (8) are respectively provided with a reserved positioning hole (304) and a reserved positioning groove (805) for passing bolts for fixing.

3. The fire-proof check valve with a butterfly-shaped fire-proof temperature sensing device according to claim 1 is characterized in that: The rotating arm (5) is also provided with an auxiliary claw (503) located at the rear side of the claw (502).

4. The fire-proof check valve with a butterfly-shaped fire-proof temperature sensing device according to claim 1 is characterized in that: The rotating arm (5) is provided with a connection groove (504) for connecting the fuse piece. The fuse piece (7) comprises a connection portion (701) inserted into the connection groove (504), an adhesive portion (702) for bonding, and a transition portion (703) for connecting the adhesive portion and the connection portion.

5. The fire-proof check valve with a butterfly-shaped fire-proof temperature sensing device according to claim 1 is characterized in that: A metal non-return door frame (10) is obliquely arranged on the inner wall or end of the metal cylinder (1), and two non-return door plates (2) are symmetrically arranged on the metal non-return door frame (10).

6. The fire-proof check valve with a butterfly-shaped fire-proof temperature sensing device according to claim 1 is characterized in that: The metal cylinder (1) comprises an upper cylinder (101) and a lower cylinder (102) which are sleeved with each other. The upper cylinder (101) is provided with a protrusion (103), and a corresponding position on the lower cylinder (102) is provided with an L-shaped groove (104). The lower cylinder (102) is inserted into the upper cylinder (101), and the protrusion (103) is inserted into the longitudinal groove of the L-shaped groove (104). When the upper cylinder (101) or the lower cylinder (102) is rotated, the protrusion (103) is stuck in the transverse groove of the L-shaped groove (104) and locked.

7. The fire-proof check valve with a butterfly-shaped fire-proof temperature sensing device according to claim 6 is characterized in that: A metal mounting seat (11) is provided at one end of the lower cylinder (102); the metal mounting seat (11) and the lower cylinder (102) are a welded structure or an integrally formed structure.

8. The fire-proof check valve with a butterfly-shaped fire-proof temperature sensing device according to claim 1, characterized in that: The metal cylinder (1) is an integrally formed structure. A metal mounting seat (11) is provided at one end of the metal cylinder (1). The metal mounting seat (11) and the metal cylinder (1) are a welded structure or an integrally formed structure.

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