Fireproof check valve

Abstract

The utility model provides a fireproof check valve, which relates to the technical field of kitchen appliances and comprises a valve body, a valve plate and a fireproof rod, the valve plate is rotatably connected with the valve body through a first rotating shaft and used for opening and closing an air outlet of the valve body, and the first rotating shaft extends along a first direction; the fireproof rod is rotationally connected with the valve body, and the fireproof rod can move in the second direction after being unlocked so as to push the valve plate to close the air outlet; the fireproof rod is located on the rear side of the valve block. The fireproof rod comprises a second rotating shaft and a stopping section which are connected with each other, the joint of the second rotating shaft and the stopping section is in arc transition, and the outer diameter of the second rotating shaft and the outer diameter of the stopping section are both larger than the outer diameter of the arc transition position; a shaft hole allowing the second rotating shaft to penetrate through is formed in the valve body, the shaft hole comprises an insertion port close to the stop section, and the insertion port and the arc transition position are arranged at intervals in the axial direction of the second rotating shaft; the outer diameter of the portion, located at the insertion port, of the second rotating shaft is roughly consistent with the inner diameter of the insertion port.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen appliances, in particular to a fire-proof check valve. Background Art

[0002] A fire check valve consists of a valve body, a valve disc, and a fire rod. The valve disc is rotatably connected to the valve body. The fire rod includes a rotating shaft that rotates with the valve body and a stopper segment that forms a circular transition with the shaft. The stopper segment is designed to abut the valve disc. When a fire occurs, the fusible link melts, and the fire rod, driven by a spring, moves toward the valve disc. The stopper segment pushes the valve disc, causing it to close the smoke guide hole in the valve body.

[0003] However, in the existing fire check valve, during the processing of the fire rod, the fire rod is formed by bending a rod body to form a rotating shaft and a stop section. Therefore, the diameter of the arc transition between the two is smaller than the diameter of other non-bent parts on the fire rod. There will be a gap between the arc transition and the axial hole on the valve body, which will cause the fire rod to shake, resulting in insufficient sealing of the valve plate, and the valve plate is prone to accidental opening when a fire occurs. Utility Model Content

[0004] The purpose of the utility model is to provide a fire prevention check valve to alleviate the technical problem that the existing fire prevention rod is easy to shake.

[0005] In a first aspect, the utility model provides a fire check valve comprising: a valve body, a valve disc, and a fire rod, wherein the valve disc is rotatably connected to the valve body via a first rotating shaft, and is used to open and close an air outlet of the valve body, and the first rotating shaft extends in a first direction; the fire rod is rotatably connected to the valve body, and the fire rod can move in a second direction after being unlocked to push the valve disc to close the air outlet; the fire rod is located at the rear side of the valve disc;

[0006] The fireproof rod includes a second rotating shaft and a stop section connected to each other, the connection between the second rotating shaft and the stop section is an arc transition, and the outer diameters of the second rotating shaft and the stop section are both larger than the outer diameter of the arc transition;

[0007] The valve body is provided with an axial hole for the second rotating shaft to pass through, the axial hole includes an insertion port close to the stop section, and in the axial direction of the second rotating shaft, the insertion port is spaced apart from the arc transition portion;

[0008] An outer diameter of a portion of the second rotating shaft located at the insertion port is substantially consistent with an inner diameter of the insertion port.

[0009] Furthermore, the fire check valve further comprises a bracket, which is connected to the valve body;

[0010] The shaft hole is arranged on the bracket; and a driving spring is connected between the bracket and the second rotating shaft so that the fireproof rod has a tendency to close the valve plate.

[0011] Furthermore, the bracket includes a first support arm and a second support arm spaced apart in the front-to-back direction, the first support arm is provided with a first mounting hole, the second support arm is provided with a second mounting hole, the second mounting hole is a through hole, the first mounting hole and the second mounting hole are aligned in the front-to-back direction, and the second mounting hole is away from an end of the first mounting hole to form an insertion port;

[0012] And / or, the driving spring includes a torsion spring, the second rotating shaft passes through the torsion spring, the torsion spring includes a first end and a second end, the first end is connected to the bracket, and the second end is connected to the stop segment.

[0013] Furthermore, a hook is provided at the second end, which is connected to the fireproof rod and is used to prevent the fireproof rod from moving axially along the second rotating shaft.

[0014] Furthermore, the first mounting hole is a through hole; a positioning portion is also provided on the bracket, and along the front-to-back direction, the first support arm is located between the positioning portion and the second support arm, and the end of the second rotating shaft abuts against the positioning portion.

[0015] Furthermore, the first mounting hole is a blind hole, and an end of the second rotating shaft away from the stop section abuts against the bottom surface of the first mounting hole.

[0016] Furthermore, the difference between the outer diameter of the portion of the second rotating shaft located at the insertion port position and the inner diameter of the insertion port is less than or equal to 0.05 mm.

[0017] Furthermore, one end of the stop section that abuts against the valve plate is a round head.

[0018] Furthermore, the first rotating shaft can rotate relative to the valve body, and one-way rotating components are correspondingly provided on the first rotating shaft and the valve body, so that the valve plate can rotate in one direction to close the air outlet.

[0019] Furthermore, the one-way rotation assembly includes a ratchet wheel arranged on the first rotating shaft, and a pawl arranged on the valve body.

[0020] The present invention has at least the following advantages or beneficial effects:

[0021] The fireproof check valve provided by the utility model comprises: a valve body, a valve disc and a fireproof rod, the valve disc is rotatably connected to the valve body through a first rotating shaft, and is used for opening and closing the air outlet of the valve body, and the first rotating shaft extends along a first direction; the fireproof rod is rotatably connected to the valve body, and the fireproof rod can move along a second direction after it is unlocked to push the valve disc to close the air outlet; the fireproof rod is located on the rear side of the valve disc; the fireproof rod comprises a second rotating shaft and a stop section connected to each other, and the connection between the second rotating shaft and the stop section is an arc transition, and the outer diameter of the second rotating shaft and the outer diameter of the stop section are both larger than the outer diameter of the arc transition; an axial hole for the second rotating shaft to pass through is provided on the valve body, and the axial hole comprises an insertion port close to the stop section, and in the axial direction of the second rotating shaft, the insertion port and the arc transition are spaced apart; the outer diameter of the part of the second rotating shaft located at the insertion port position is roughly consistent with the inner diameter of the insertion port.

[0022] During the preparation of the fireproof rod, the two parts of the fireproof rod, namely the second rotating shaft and the stop section, are formed by bending a straight rod, and the diameter of the bent part becomes smaller after being compressed. Due to the clearance of the shaft hole, it is necessary to set the arc transition as far away from the insertion port as possible. That is to say, during assembly, the second rotating shaft is inserted into the shaft hole from the insertion port on the rear side. In the axial direction of the second rotating shaft, the insertion port and the arc transition are spaced apart. After the stop section is subjected to the thrust in the front-to-back direction, the second rotating shaft will tend to shake at the insertion port. Because the outer diameter of the part of the second rotating shaft located at the insertion port is roughly the same as the inner diameter of the insertion port, the radial gap between the two is very small, which can greatly reduce the shaking amplitude of the second rotating shaft in the shaft hole. The displacement of the end of the stop section that abuts the valve plate in the front-to-back direction is very small, which makes the pressure connection of the fireproof rod to the valve plate tighter. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 A schematic diagram of a fire check valve provided in an embodiment of the present utility model;

[0025] Figure 2 A schematic diagram of a bracket of a fire-proof check valve provided by an embodiment of the present utility model at one angle;

[0026] Figure 3 A schematic diagram of another angle of the bracket of the fire check valve provided by an embodiment of the present utility model;

[0027] Figure 4 for Figure 1 A partial enlarged view of position A in the middle.

[0028] Icons: 100 - valve body; 120 - bracket; 121 - first support arm; 122 - second support arm; 1221 - insertion port; 123 - torsion spring; 1231 - hook; 124 - positioning portion;

[0029] 200 - valve plate; 300 - fire rod; 310 - second rotating shaft; 320 - stop section;

[0030] 510 - ratchet; 520 - pawl. DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0034] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0036] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0037] like Figure 1 - Figure 3 As shown, the fire check valve provided by the present invention includes: a valve body 100, a valve disc 200, and a fire rod 300. The valve body 100 is connected to the public flue. The valve disc 200 is rotatably connected to the valve body 100 via a first rotating shaft, and is used to open and close the air outlet of the valve body 100. In this embodiment, the first rotating shaft extends in the left-right direction, and the lower end of the valve disc 200 is connected to the lower end of the valve body 100. In other possible implementations, the connection position of the valve disc 200 to the valve body 100 can be the top, left, or right, and the corresponding extension direction of the first rotating shaft is also changed.

[0038] The fire lever 300 is located behind the valve disc 200 and is rotatably connected to the valve body 100. Once unlocked, the fire lever 300 can move in a second direction to push the valve disc 200 to close the air outlet. In this embodiment, the rotation plane of the fire lever 300 is perpendicular to the front-to-back direction. When viewed from the rear side of the valve disc 200, the fire lever 300 rotates clockwise to lock.

[0039] The fireproof rod 300 includes a second rotating shaft 310 and a stop section 320 connected to each other. The connection between the second rotating shaft 310 and the stop section 320 is an arc transition, and the outer diameters of the second rotating shaft 310 and the stop section 320 are both larger than the outer diameter of the arc transition.

[0040] The fire rod 300 is formed by bending a rod body. The ends of the curved transition form a second rotating shaft 310 and a stopper 320, respectively. The stopper 320 is used to stop and limit the valve plate 200. Because the inner corner of the bend is squeezed, the diameter of the curved transition becomes smaller, resulting in the outer diameters of the second rotating shaft 310 and the stopper 320 being larger than the outer diameter of the curved transition.

[0041] The valve body 100 is provided with an axial hole for the second rotating shaft 310 to pass through. The axial hole includes an insertion port 1221 near the stop section 320. During installation, the second rotating shaft 310 is inserted into the axial hole through the insertion port 1221. In the axial direction of the second rotating shaft 310, the insertion port 1221 is spaced apart from the arc transition point, thereby preventing the arc transition point from being located within the insertion port 1221. The outer diameter of the portion of the second rotating shaft 310 located at the insertion port 1221 is roughly the same as the inner diameter of the insertion port 1221. If the arc transition point is located within the insertion port 1221 on the valve body 100, the radial gap between the outer wall of the arc transition point and the inner wall of the insertion port 1221 is large, thereby increasing the amplitude of the fire rod 300's shaking.

[0042] The second rotating shaft 310 is inserted into the shaft hole from the insertion port 1221 on the rear side. In the axial direction of the second rotating shaft 310, the insertion port 1221 is spaced apart from the arc transition. After the stop section 320 is subjected to the thrust in the front-to-back direction, the second rotating shaft 310 will tend to shake at the insertion port 1221. Because the outer diameter of the part of the second rotating shaft 310 located at the insertion port 1221 is roughly the same as the inner diameter of the insertion port 1221, the radial gap between the two is very small, which can greatly reduce the shaking amplitude of the second rotating shaft 310 in the shaft hole. The displacement of the end of the stop section 320 that abuts against the valve plate 200 in the front-to-back direction is very small, so that the fire rod 300 is pressed more tightly against the valve plate 200.

[0043] The fire check valve also includes a bracket 120, which is connected to the valve body 100; an axial hole is set on the bracket 120; a driving spring is connected between the bracket 120 and the second rotating shaft 310, so that the fire rod 300 has a tendency to close the valve plate 200.

[0044] The bracket 120 can be connected to the valve body 100 via screws. The axial hole in the bracket 120 extends in the front-to-back direction. The second shaft 310 is inserted into the axial hole through the rear insertion port 1221, with a portion of the second shaft 310 inserted into the axial hole. Before a fire occurs, the fire rod 300 is restrained by the fusible link and cannot move. Only after a fire occurs and the fusible link opens, the fire rod 300 rotates upward, driven by the drive spring.

[0045] like Figure 2 and Figure 3 As shown, the bracket 120 includes a first support arm 121 and a second support arm 122 spaced apart along the front-to-back direction, the first support arm 121 is provided with a first mounting hole, and the second support arm 122 is provided with a second mounting hole. In the front-to-back direction, the first mounting hole and the second mounting hole are aligned, and an end of the second mounting hole away from the first mounting hole forms an insertion port 1221.

[0046] Specifically, the first support arm 121 and the second support arm 122 are arranged in parallel, with the first support arm 121 closer to the front and the second support arm 122 closer to the rear. A first mounting hole is provided on the first support arm 121, and a second mounting hole is provided on the second support arm 122. The second mounting hole is a through hole, and the first and second mounting holes are aligned in the front-to-back direction. Both the first and second mounting holes have a certain length in the front-to-back direction, and the end of the second mounting hole away from the first mounting hole forms an insertion port 1221.

[0047] The drive spring includes a torsion spring 123. The second rotating shaft 310 extends through the torsion spring 123. The torsion spring 123 can be positioned between the first support arm 121 and the second support arm 122, limiting the torsion spring 123 in the front-to-back direction. The torsion spring 123 includes a first end and a second end. The first end is connected to the bracket 120 and fixed thereto. The second end is connected to the stop segment 320, driving the fire rod 300 to rotate.

[0048] The second end is provided with a hook 1231 , which is connected to the fire-proof rod 300 and is used to prevent the fire-proof rod 300 from moving axially along the second rotating shaft 310 .

[0049] The hook 1231 is U-shaped and half surrounds the side wall of the fire rod 300 . On the one hand, the hook 1231 can pull the fire rod 300 to rotate, and on the other hand, it is used to prevent the fire rod 300 from moving axially along the second rotating shaft 310 .

[0050] In this embodiment, the first mounting hole is a through hole; a positioning portion 124 is also provided on the bracket 120. Along the front-to-back direction, the first support arm 121 is located between the positioning portion 124 and the second support arm 122, and the end of the second rotating shaft 310 abuts against the positioning portion 124.

[0051] The positioning portion 124 is a plate-like structure, and along the front-to-back direction, the first support arm 121 is located between the positioning portion 124 and the second support arm 122. During the installation process of the second rotating shaft 310, after the second rotating shaft 310 passes through the second support arm 122 and the first support arm 121 in sequence, the end of the second rotating shaft 310 abuts the positioning portion 124, indicating that the installation is in place. This facilitates controlling the insertion depth of the second rotating shaft 310 into the shaft hole during installation to avoid inserting the second rotating shaft 310 into the shaft hole at the arc transition point.

[0052] In another feasible solution, the positioning portion 124 may not be additionally provided, and the first mounting hole may be provided as a blind hole. The bottom surface of the blind hole is used to stop the end of the second rotating shaft 310 away from the stop section 320, so as to achieve the positioning of the second rotating shaft 310 when the second rotating shaft 310 is inserted.

[0053] Ideally, the outer diameter of the portion of the second rotating shaft 310 located at the insertion port 1221 is consistent with the inner diameter of the insertion port 1221. However, in actual production, there must be a radial gap between the insertion port 1221 and the second rotating shaft 310. However, in order to reduce the shaking amplitude as much as possible, the difference between the outer diameter of the portion of the second rotating shaft 310 located at the insertion port 1221 and the inner diameter of the insertion port 1221 is set to be less than or equal to 0.05 mm, which meets the size requirements.

[0054] In order to make the fireproof rod 300 slide smoothly on the valve plate 200, the abutting end of the fireproof rod 300 is rounded to reduce sliding friction.

[0055] like Figure 4 As shown, the first rotating shaft is capable of rotating relative to the valve body 100. One-way rotation assemblies are correspondingly provided on the first rotating shaft and the valve body 100 to enable the valve disc 200 to rotate unidirectionally to close the air outlet. Specifically, the one-way rotation assembly includes a ratchet 510 provided on the first rotating shaft and a pawl 520 provided on the valve body 100. When the valve disc 200 rotates forward, the pawl 520 does not hinder the ratchet 510, achieving one-way rotation. Conversely, when the valve disc 200 tends to move backward, the pawl 520 hinders the ratchet 510, further improving the sealing performance of the valve disc 200.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fire check valve, characterized in that: include: A valve body (100), a valve plate (200) and a fireproof rod (300), wherein the valve plate (200) is rotatably connected to the valve body (100) via a first rotating shaft and is used to open and close the air outlet of the valve body (100), and the first rotating shaft extends along a first direction; the fireproof rod (300) is movably connected to the valve body (100), and the fireproof rod (300) can move along a second direction after being unlocked to push the valve plate (200) to close the air outlet; the fireproof rod (300) is located at the rear side of the valve plate (200); The fireproof rod (300) comprises a second rotating shaft (310) and a stop section (320) connected to each other, the second rotating shaft (310) and the stop section (320) are arranged at an angle, the connection between the second rotating shaft (310) and the stop section (320) is in an arc transition, and the outer diameters of the second rotating shaft (310) and the stop section (320) are both larger than the outer diameter of the arc transition; The valve body (100) is provided with an axial hole for the second rotating shaft (310) to pass through, the axial hole includes an insertion port (1221) close to the stop section (320), and in the axial direction of the second rotating shaft (310), the insertion port (1221) is spaced apart from the arc transition portion; The outer diameter of the portion of the second rotating shaft (310) located at the position of the insertion port (1221) is substantially consistent with the inner diameter of the insertion port (1221).

2. The fire-proof check valve according to claim 1, characterized in that: The fireproof check valve further comprises a bracket (120), wherein the bracket (120) is connected to the valve body (100); The shaft hole is provided on the bracket (120); a driving spring is connected between the bracket (120) and the second rotating shaft (310), so that the fireproof rod (300) has a tendency to close the valve plate (200).

3. The fire-proof check valve according to claim 2, characterized in that: The bracket (120) comprises a first support arm (121) and a second support arm (122) spaced apart in a front-to-back direction, the first support arm (121) being provided with a first mounting hole, the second support arm (122) being provided with a second mounting hole, the second mounting hole being a through hole, the first mounting hole and the second mounting hole being aligned in the front-to-back direction, and a port of the second mounting hole away from the first mounting hole forming the insertion port (1221); And / or, the driving spring includes a torsion spring (123), the second rotating shaft (310) passes through the torsion spring (123), the torsion spring (123) includes a first end and a second end, the first end is connected to the bracket (120), and the second end is connected to the stop section (320).

4. The fire-proof check valve according to claim 3, characterized in that: The second end is provided with a hook (1231), and the hook (1231) is connected to the fire-proof rod (300) and is used to prevent the fire-proof rod (300) from moving axially along the second rotating shaft (310).

5. The fire-proof check valve according to claim 3, characterized in that: The first mounting hole is a through hole; a positioning portion (124) is further provided on the bracket (120); along the front-back direction, the first support arm (121) is located between the positioning portion (124) and the second support arm (122); and the end of the second rotating shaft (310) abuts against the positioning portion (124).

6. The fire-proof check valve according to claim 3, characterized in that: The first mounting hole is a blind hole, and one end of the second rotating shaft (310) away from the stop section (320) abuts against the bottom surface of the first mounting hole.

7. The fireproof check valve according to any one of claims 1 to 6, characterized in that: The difference between the outer diameter of the portion of the second rotating shaft (310) located at the position of the insertion port (1221) and the inner diameter of the insertion port (1221) is less than or equal to 0.05 mm.

8. The fireproof check valve according to any one of claims 1 to 6, characterized in that: One end of the stop section (320) that abuts against the valve plate (200) is a round head.

9. The fireproof check valve according to any one of claims 1 to 6, characterized in that: The first rotating shaft is capable of rotating relative to the valve body (100), and one-way rotating components are correspondingly provided on the first rotating shaft and the valve body (100) so as to enable the valve plate (200) to rotate in one direction to close the air outlet.

10. The fire-proof check valve according to claim 9, characterized in that: The one-way rotation assembly includes a ratchet (510) arranged on the first rotating shaft, and a pawl (520) arranged on the valve body (100).

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