Locking structure and fire check valve

Abstract

The present invention relates to a locking structure and a fire prevention check valve, aiming to optimize the structure of the fire prevention check valve, especially the structure of the locking structure. The locking structure includes a valve seat, a connecting rod, a first elastic element, a dial and a second elastic element. The dial and the connecting rod are respectively rotatably connected to the valve seat. The first elastic element is used to drive the connecting rod to rotate relative to the valve seat, and the second elastic element is used to drive the dial to rotate relative to the valve seat. It further includes a stop plate and a temperature sensing element. The temperature sensing element is fixedly arranged on the valve seat, and the stop plate is rotatably connected to the valve seat. When the temperature sensing element works, the second elastic element pushes the stop plate to rotate through the dial and abuts against the temperature sensing element. When the temperature sensing element stops working, the second elastic element drives the connecting rod to rotate through the dial, so that the connecting rod drives the valve disc to close the exhaust port.

Description

Technical Field

[0001] The present invention relates to a locking structure and a fire check valve. Background Art

[0002] The utility model patent with the application number 201820551450.3 discloses an oil fume exhaust fire check valve, the structure of which includes a valve body and a valve flap. An oil fume passage is provided inside the valve body. An air inlet port and an air outlet port communicating with the oil fume passage are oppositely opened at both ends of the valve body. The axial cross-section of the valve body is trapezoidal. The air outlet port is opened on the inclined surface of the valve body. The valve flap is hinged to the valve body and forms a normally closed mating structure that can be opened when impacted by air flow with the valve body. A through hole is opened at the bottom of the valve body, and a fuse is placed in the through hole and extends upward and downward out of the through hole; a fire prevention reset mechanism for resetting the valve flap is provided in the oil fume passage of the valve body. The fire prevention reset mechanism includes a connecting part and a forced closing part. Two ends of the connecting part are oppositely hinged to the inner wall of the valve body and the surface of the valve flap. One end of the forced closing part is hinged to the connecting part, and the other end of the forced closing part presses or pulls the part of the fuse extending upward out of the through hole; when the temperature inside or outside the oil fume passage exceeds the fusing temperature of the fuse, the fuse melts, and the forced closing part presses down the connecting part to forcibly close the air outlet port of the valve body.

[0003] Among them, the connecting part includes a base fixed to the inner wall of the valve body, a rotating rod connected to the base through a first rotating shaft, and an arc-shaped rod hingedly connecting the rotating rod and the surface of the valve flap; a card slot is provided on the surface of the rotating rod, and a first torsion spring is wound around the first rotating shaft. The first torsion spring connects the rotating rod and the base; the forced closing part includes a pressing bracket and a linkage bracket; a card hole is provided at one end of the pressing bracket, and the other end of the pressing bracket is hinged to the base through a second rotating shaft. A second torsion spring is wound around the second rotating shaft. The second torsion spring connects the pressing bracket and the base; the linkage bracket is arranged obliquely. The linkage bracket is obliquely hooked and clamped in the card hole of the pressing bracket, and the linkage bracket obliquely presses or pulls the part of the fuse extending upward out of the through hole; when the fuse melts, the pressing bracket presses down the linkage bracket and the rotating rod under the action of the second torsion spring. When the pressing bracket is clamped in the card slot of the rotating rod, the arc-shaped rod pulls the valve flap to forcibly close the air outlet port of the valve body.

[0004] However, the existing fire check valves have the following disadvantages: 1. The structure of the fire check valve is complex; the valve disc is hinged to the valve body, and the valve disc is also connected to the valve body through a connecting part. 2. The connecting part is only used to connect the valve disc and the valve body; since the arc-shaped rod is hinged to the rotating rod, the arc-shaped rod and the rotating rod only serve to connect the valve disc and the base. 3. There is a problem of smoke leakage in the fire check valve; when a through hole is provided at the bottom of the valve body, the gas flow paths inside and outside the room will be connected by the through hole, that is to say, the smoke inside the room can enter the outside through the through hole, and the smoke outside the room can enter the room through the through hole. Summary of the Invention

[0005] The problem to be solved by the present invention is to provide a locking structure and a fire check valve to optimize the structure of the fire check valve, especially to optimize the structure of the locking structure.

[0006] To solve the above problems, the present invention provides the following technical solutions:

[0007] The locking structure includes a valve seat, a connecting rod, a first elastic element, a dial and a second elastic element. The dial and the connecting rod are respectively rotatably connected to the valve seat. The first elastic element is used to drive the connecting rod to rotate relative to the valve seat. The second elastic element is used to drive the dial to rotate relative to the valve seat. It also includes a stop plate and a temperature sensing element. The temperature sensing element is fixedly arranged on the valve seat. The stop plate is rotatably connected to the valve seat. When the temperature sensing element works, the second elastic element pushes the stop plate to rotate through the dial and abuts against the temperature sensing element. When the temperature sensing element stops working, the second elastic element drives the connecting rod to rotate through the dial, so that the connecting rod drives the valve disc to close the exhaust port.

[0008] In the present invention, the stop plate is rotatably connected to the valve seat. When the temperature sensing element works, the second elastic element pushes the stop plate to rotate through the dial and abuts against the temperature sensing element. Since the temperature sensing element is fixedly arranged on the valve seat (in other words, the temperature sensing element is fixedly connected to the valve seat to define the installation position of the temperature sensing element on the valve seat), after the second elastic element pushes the stop plate to rotate through the dial and abuts against the temperature sensing element, the temperature sensing element prevents the second elastic element from pushing the dial to rotate through the stop plate, so that the dial remains stationary. Designed in this way, the "auxiliary structure" required for the dial to remain stationary in a normal temperature environment is changed.

[0009] In the present invention, since the temperature sensing element is fixedly arranged on the valve seat, there is no need to open a hole on the valve body for arranging the temperature sensing element. Designed in this way, by optimizing the locking structure, the phenomenon of smoke leakage in the fire check valve due to the opening of the valve body is effectively eliminated, so as to improve the reliability of the fire check valve.

[0010] It is not difficult to infer from the two technical features of "the connecting rod is rotatably connected to the valve seat" and "the connecting rod drives the valve plate to close the exhaust port" that the connecting rod of this embodiment is used to directly connect the valve seat and the valve plate. When the connecting rod is used to directly connect the valve seat and the valve plate, the connecting rod will not need to use a rotating shaft like the fire check valve in the background technology (in the background technology, the valve plate is hinged to the valve body. When the two are hinged, they must use a rotating shaft to achieve the hinge) to open or close the exhaust port of the valve plate at normal temperature. Such a design can effectively reduce the number of components required for the fire check valve by optimizing the locking structure, so as to reduce the manufacturing cost of the fire check valve and shorten the production cycle of the fire check valve.

[0011] In addition, from the technical feature that "the second elastic element drives the connecting rod to rotate through the paddle, so that the connecting rod drives the valve plate to close the exhaust port", it can be concluded that the connecting rod can drive the valve plate to close the exhaust port in a high temperature environment. With this design, by optimizing the locking structure, the connecting rod can close the exhaust port in both normal temperature and high temperature environments, thereby increasing the use environment of the connecting rod.

[0012] Preferably, a lower groove is provided on the stop plate, and when the temperature sensing element is working, the angle between the notch of the lower groove and the exhaust port is less than 90°.

[0013] Preferably, a fastening mechanism is provided on the valve seat, the temperature sensing element is arranged on the fastening mechanism, a stop section and a clamping section with a notch are provided on the lower clamping groove, the temperature sensing element is clamped on the clamping section, and the stop section is used to prevent the temperature sensing element from withdrawing from the clamping section.

[0014] Preferably, there is a hinge between the stop plate and the valve seat, and the stop plate is also provided with a block for clamping the paddle, the block and the stop plate are staggered, and the distance between the block and the hinge is less than the distance between the lower groove and the hinge.

[0015] Preferably, the temperature sensing element is clamped between the fastening mechanism and the valve seat.

[0016] Preferably, the temperature sensing element is a solder ring, the fastening mechanism comprises a screw, the screw is threadedly connected to the valve seat, and the solder ring is clamped between the screw head and the outer side wall of the valve seat; or, the fastening mechanism comprises a bolt and a nut, the bolt penetrates the valve seat and is threadedly connected to the nut, and the solder ring is clamped between the bolt head and the outer side wall of the valve seat; or, the fastening mechanism comprises a rivet, the rivet is riveted to the valve seat, and the solder ring is clamped between the rivet head and the outer side wall of the valve seat.

[0017] Preferably, the paddle is provided with a first extension section extending outward and a second extension section extending in the length direction of the paddle from the first extension section. When the temperature sensing element is working, the second extension section is arranged upward and forms an upper clamping groove for clamping the upper part of the stop plate together with the first extension section and the paddle.

[0018] Preferably, the connecting rod is provided with a receiving hole, and a stopping portion is arranged in the receiving hole. After the temperature sensing element stops working, the paddle is clamped to the stopping portion.

[0019] Preferably, the paddle includes a first connecting plate, a second connecting plate and a locking plate for connecting the first connecting plate and the second connecting plate. The first connecting plate and the second connecting plate are respectively rotatably connected to the valve seat. The locking plate is provided with a locking surface for fitting the stopping portion, and the locking plate penetrates through the receiving hole and fits the stopping portion through the locking surface.

[0020] A fire prevention check valve includes a valve body, a valve flap and a locking structure. The valve flap is connected to the valve body through the locking structure, and the locking structure is the locking structure described in any one of the above technical solutions. Description of the Drawings

[0021] Figure 1 Is a perspective view of the fire prevention check valve in the preferred embodiment of the present invention;

[0022] Figure 2 Is the front view of the fire prevention check valve in the preferred embodiment of the present invention;

[0023] Figure 3 Is Figure 2 The cross-sectional view at A-A in

[0024] Figure 4 Is a perspective view of the locking structure in the preferred embodiment of the present invention;

[0025] Figure 5 Is a perspective view of the stop plate in the preferred embodiment of the present invention;

[0026] Figure 6 Is a perspective view of the connecting rod in the preferred embodiment of the present invention;

[0027] Figure 7 Is a perspective view of the paddle in the preferred embodiment of the present invention. Detailed Embodiments

[0028] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the drawings of the embodiments of the present invention. However, the following embodiments are only the preferred embodiments of the present invention and not all of them. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative work all fall within the protection scope of the present invention.

[0029] Embodiment 1

[0030] Refer to Figure 1 and Figure 4 , the locking structure 300 includes a valve seat 1, a connecting rod 2, a first elastic element 3, a dial 4 and a second elastic element 5. The dial 4 and the connecting rod 2 are respectively rotatably connected to the valve seat 1. The first elastic element 3 is used to drive the connecting rod 2 to rotate relative to the valve seat 1, and the second elastic element 5 is used to drive the dial 4 to rotate relative to the valve seat 1.

[0031] There are various ways for the dial 4 to be rotatably connected to the valve seat 1. Since this embodiment does not improve this structure, therefore, this embodiment only lists one of the schemes for the dial 4 to be rotatably connected to the valve seat 1 for reference: Refer to Figure 4 , a first shaft hole is provided on the dial 4, a second shaft hole is provided on the valve seat 1, and a second shaft rod penetrates through the first shaft hole and the second shaft hole to realize the rotational connection between the dial 4 and the valve seat 1. The way of the rotational connection between the connecting rod 2 and the valve seat 1 can refer to the way of "the rotational connection between the dial 4 and the valve seat 1", that is, a first shaft rod penetrates through a third shaft hole on the connecting rod and a fourth shaft hole on the valve seat to realize the rotational connection between the connecting rod 2 and the valve seat 1.

[0032] The first elastic element 3 and the second elastic element 5 can be one or more of a tension spring, a compression spring, and a torsion spring. From Figure 4 it can be seen that the first elastic element 3 and the second elastic element 5 in this embodiment are selected to be torsion springs. Among them, the first elastic element 3 is sleeved on the first shaft rod, and one torsion arm of the first elastic element 3 is arranged on the connecting rod 3, and the other torsion arm of the first elastic element 3 is arranged on the valve seat 1, so that the connecting rod 2 always maintains a tendency to drive the valve plate 200 to close the exhaust port 1001; the second elastic element 5 is sleeved on the second shaft rod, one torsion arm of the second elastic element 5 is arranged on the dial 4, and the other torsion arm of the second elastic element 5 is arranged on the valve seat 1, so that the dial 4 always maintains a tendency to drive the stop plate 6 to press the temperature sensing element 7.

[0033] Refer to Figure 2 and Figure 3 , the locking structure 300 further includes a stop plate 6 and a temperature sensing element 7. The temperature sensing element 7 is fixedly arranged on the valve seat 1, the stop plate 6 is rotatably connected to the valve seat 1. When the temperature sensing element 7 works, the second elastic element 5 drives the stop plate 6 to rotate through the dial 4 and abuts against the temperature sensing element 7. When the temperature sensing element 7 stops working, the second elastic element 5 drives the connecting rod 3 to rotate through the dial 4, so that the connecting rod 3 drives the valve plate 200 to close the exhaust port 1001.

[0034] It should be noted that: in the present embodiment, the temperature sensing element 7 is a fusible solder, and the fusible solder includes mystic-based, indium-based, tin-based, cadmium-based, zinc-based and lead-based solders. Under normal temperature, the temperature sensing element 7 does not deform to maintain a working state. At this time, the second elastic element 5 pushes the stop plate 6 to rotate through the paddle 4 and resists against the temperature sensing element 7 to keep the paddle 4 stationary. Under high temperature, the temperature sensing element 7 is heated and melted into liquid to exit the working state. At this time, the second elastic element 5 drives the connecting rod 2 to rotate through the paddle 4, so that the connecting rod 2 drives the valve plate 200 to close the exhaust port 1001. Of course, the temperature sensing element 7 can also be a memory metal. Under normal temperature, the memory metal itself does not deform and is located on the movement path of the stop plate 6. At this time, the second elastic element 5 pushes the stop plate 6 to rotate through the paddle 4 and resists against the temperature sensing element 7 to keep the paddle 4 stationary. Under high temperature, the memory metal is deformed by the heat and is offset from the stop plate 6. At this time, the second elastic element 5 drives the connecting rod 2 to rotate through the paddle 4, so that the connecting rod 2 drives the valve plate 200 to close the exhaust port 1001.

[0035] See also Figure 3 and Figure 5 A lower slot 31 is provided on the stop plate 6. When the temperature sensing element 7 is working, the angle between the notch of the lower slot 31 and the exhaust port 1001 is a, and a is less than 90°. When a is less than 90°, the second elastic element 5 pushes the stop plate 6 to rotate through the paddle 4, so that the slot wall of the lower slot 31 facing away from the notch always maintains the squeezing force on the temperature sensing element 7.

[0036] See also Figure 4 and Figure 5 The valve seat 1 is provided with a fastening mechanism 8, the temperature sensing element 7 is provided on the fastening mechanism 8, the lower clamping groove 31 is provided with a stopper section 312 with a notch and a clamping section 311, the temperature sensing element 7 is clamped on the clamping section 311, and the stopper section 312 is used to prevent the temperature sensing element 7 from exiting the clamping section 311. With such a design, the movement range of the stop plate 6 relative to the temperature sensing element 7 is further reduced, and in addition, the stopper section 312 also increases the connection strength between the stop plate 6 and the temperature sensing element 7.

[0037] In this embodiment, the stop plate 6 is rotatably connected to the valve seat 1. Figure 5 It can be seen that the stop plate 6 is provided with a mounting hole 33. When the valve seat 1 is provided with a mounting rod (here only one of the ways in which the stop plate 6 and the valve seat 1 are rotatably connected is listed), the mounting rod is inserted into the mounting hole 33 to realize the rotatable connection between the stop plate 6 and the valve seat 1. In this structure, since the stop plate 6 and the valve seat 1 are rotatably connected, there is a hinge between the stop plate 6 and the valve seat 1, and the "hinged joint is the mounting hole 33 or the mounting rod".

[0038] See also Figure 4 and Figure 5, a clamping block 32 for clamping the dial 4 is further provided on the stop plate 6. The clamping block 32 is arranged in a dislocation manner with respect to the stop plate 6. Moreover, the spacing distance between the clamping block 32 and the hinge joint < the spacing distance between the lower card slot 31 and the hinge joint. When the spacing distance between the clamping block 32 and the hinge joint < the spacing distance between the lower card slot 31 and the hinge joint, the stop plate 6 uses the "lever principle" to keep the dial 4 stationary through a smaller extrusion force on the lower card slot 31. With such a design, by reducing the acting force of the stop plate 6 on the temperature sensing element 7, the probability of deformation of the temperature sensing element 7 in a normal temperature environment is reduced.

[0039] The temperature sensing element 7 is clamped between the fastening mechanism 8 and the valve seat 1. There are many optional solutions for the temperature sensing element 7 and the fastening mechanism 8. Taking the temperature sensing element 7 as an example, the temperature sensing element can be a solder ring, a solder block, an arc-shaped solder section, etc. In this embodiment, the temperature sensing element 8 is preferably a solder ring. When the temperature sensing element 8 is a solder ring, the fastening mechanism 8 can include a screw. The fastening mechanism 8 can include a bolt and a nut. The fastening mechanism 8 can also include a rivet. When the fastening mechanism 8 includes a screw, the screw is threadedly connected to the valve seat 1, and the solder ring is clamped between the head of the screw and the outer side wall of the valve seat 1. When the fastening mechanism 8 includes a bolt and a nut, the bolt passes through the valve seat 1 and is threadedly connected to the nut, and the solder ring is clamped between the head of the bolt and the outer side wall of the valve seat 1. When the fastening mechanism 8 includes a rivet, the rivet is riveted on the valve seat 1, and the solder ring is clamped between the head of the rivet and the outer side wall of the valve seat 1.

[0040] See Figure 7 , a first extension section 42 extending outward is provided on the dial 4, and a second extension section 43 extending in the length direction of the dial 4 from the first extension section 42. In this embodiment, Figure 4 The shown locking structure is the state in which the sensing element 7 works. When the temperature sensing element 7 works, the second extension section 43 is arranged upward and forms an upper card slot 41 with the first extension section 42 and the dial 4 for clamping the upper part of the stop plate 6 (the upper part of the stop plate 6 refers to the clamping block 32). With such a design, the dial 4 can prevent the clamping block 32 from withdrawing from the upper card slot 41 in three directions to ensure that the dial 4 and the stop plate 6 always maintain a clamped state. Of course, in other embodiments of the present invention, the connection manner between the dial and the stop plate is not limited to clamping, and the two can also be threadedly connected, hinged, abutted, etc.

[0041] See Figure 6 , a receiving hole 21 is provided on the connecting rod 2, and a stopping portion 22 is provided in the receiving hole 21. After the temperature sensing element 8 stops working, the dial 4 is clamped to the stopping portion 22.

[0042] From Figure 6It can be seen that the accommodating hole 21 is a through hole that is circumferentially closed. When the accommodating hole 21 is a through hole that is circumferentially closed, the paddle 4 is preferably an open structure, that is, the paddle 4 includes a first connecting plate, a second connecting plate, and a locking plate for connecting the first connecting plate and the second connecting plate. The first connecting plate and the second connecting plate are respectively rotatably connected to the valve seat 1. The locking plate is provided with a locking surface 44 for fitting the stopping portion 22. The locking plate penetrates through the accommodating hole 21 and fits the stopping portion 22 through the locking surface 44.

[0043] In this embodiment, the locking surface 44 fits the stopping surface 221 of the stopping portion 22 when the temperature sensing element 7 stops working. This structure increases the contact area between the paddle 4 and the connecting rod 2 after stopping work. Designed in this way, by increasing the contact area between the paddle 4 and the connecting rod 2 after stopping work, the probability of the connecting rod 2 shaking in a high-temperature environment is reduced.

[0044] Embodiment Two

[0045] See Figure 1 and Figure 3 , a fire check valve, including a valve body 100, a valve disc 200, and a locking structure 300. The valve body 100 has an exhaust port 1001. The valve disc 200 is connected to the valve body 100 through the locking structure 300. The locking structure 300 closes the exhaust port 1001 through the valve disc 200.

[0046] In this embodiment, the locking structure 300 is the locking structure described in Embodiment One. It can be seen from Figure 3 that the locking structure 300 is connected to the valve disc 200 through the connecting rod 2, and the locking structure 300 is connected to the inner wall of the valve body 100 through the valve seat 1. Among them, the connection mode between the connecting rod 2 and the valve disc 200 can be a rotational connection, and the connection mode between the connecting rod 2 and the valve disc 200 can also be a fixed connection. However, the connection mode between the valve seat 1 and the inner wall of the valve body 100 is mostly a fixed connection.

[0047] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the content described in the drawings and the above specific implementation manner. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. Locking structure, comprising a valve seat, a connecting rod, a first elastic element, a paddle and a second elastic element, wherein the paddle and the connecting rod are respectively rotatably connected to the valve seat, the first elastic element is used to drive the connecting rod to rotate relative to the valve seat, and the second elastic element is used to drive the paddle to rotate relative to the valve seat, characterized in that, It further includes a stop plate and a temperature sensing element. The temperature sensing element is a fusible solder. The temperature sensing element is fixedly arranged on the valve seat. The stop plate is rotatably connected to the valve seat. When the temperature sensing element works, the second elastic element pushes the stop plate to rotate through the dial and abuts against the temperature sensing element. When the temperature sensing element stops working, the second elastic element drives the connecting rod to rotate through the dial, so that the connecting rod drives the valve plate to close the exhaust port; A lower clamping groove is arranged on the stop plate. A retaining section and a clamping section with a notch are arranged on the lower clamping groove. The temperature sensing element is clamped on the clamping section. The retaining section is used to prevent the temperature sensing element from exiting the clamping section; There is a hinged part between the stop plate and the valve seat. A clamping block for clamping the dial is further arranged on the stop plate. The clamping block is arranged in a staggered manner with the stop plate. Moreover, the distance between the clamping block and the hinged part < the distance between the lower clamping groove and the hinged part; wherein, when the temperature sensing element works, the included angle between the notch of the lower clamping groove and the exhaust port is less than 90°.

2. The locking structure according to claim 1, wherein, A fastening mechanism is arranged on the valve seat. The temperature sensing element is arranged in the fastening mechanism.

3. The locking structure according to claim 2, wherein, The temperature sensing element is clamped between the fastening mechanism and the valve seat.

4. The locking structure according to claim 3, characterized in that, The temperature sensing element is a solder ring. The fastening mechanism includes a screw. The screw is in threaded connection with the valve seat. The solder ring is clamped between the head of the screw and the outer side wall of the valve seat; or, the fastening mechanism includes a bolt and a nut. The bolt passes through the valve seat and is in threaded connection with the nut. The solder ring is clamped between the head of the bolt and the outer side wall of the valve seat; or, the fastening mechanism includes a rivet. The rivet is riveted on the valve seat. The solder ring is clamped between the head of the rivet and the outer side wall of the valve seat.

5. The locking structure according to claim 1, wherein, The dial is provided with a first extension section extending outwards and a second extension section extending in the length direction of the dial from the first extension section. When the temperature sensing element works, the second extension section is arranged upwards and forms an upper clamping groove for clamping the upper part of the stop plate with the first extension section and the dial.

6. The locking structure according to claim 1, characterized in that A receiving hole is arranged on the connecting rod. A stopping part is arranged in the receiving hole. After the temperature sensing element stops working, the dial is clamped on the stopping part.

7. The locking structure according to claim 6, wherein, The dial includes a first connecting plate, a second connecting plate and a locking plate for connecting the first connecting plate and the second connecting plate. The first connecting plate and the second connecting plate are respectively rotatably connected to the valve seat. A locking surface for fitting the stopping part is arranged on the locking plate. The locking plate penetrates through the receiving hole and fits the stopping part through the locking surface.

8. Fire prevention check valve, comprising a valve body, a valve disc and a locking structure, the valve disc is connected to the valve body through the locking structure, characterized in that, The locking structure is the locking structure according to any one of claims 1 to 7.

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