Fireproof and smoke-proof check valve for flue

Abstract

The utility model discloses a fire-proof and smoke-proof check valve for a flue. The fire-proof and smoke-proof check valve comprises a mounting assembly, a non-return assembly and a locking assembly, the locking assembly is arranged on the mounting disc; the locking assembly comprises a limiting column installed on the smoke outlet face of the installation disc and a limiting rocker arm hinged to the limiting column, a locking torsional spring is arranged on the hinged point of the limiting rocker arm and the limiting column, and a fuse link is arranged at the end, away from the limiting column, of the limiting column. After the fuse link is fused, the locking torsion spring enables the limiting rocker arm to abut against the valve plate.

Description

Technical Field

[0001] The utility model relates to the technical field of check valves, and more specifically to a flue fire and smoke prevention check valve. Background Art

[0002] A check valve is a valve with a circular disc as the opening and closing part. It blocks the backflow of the medium by its own weight and the pressure of the medium. It is an automatic valve and is also called a non-return valve, one-way valve, reflux valve or isolation valve. The disc movement mode is divided into lifting type and swing type.

[0003] Flue check valves are generally used in household range hood exhaust ducts, including range hood check valves, plastic telescopic smoke pipes and flue check valves. The check valve is mainly composed of a valve body, a rocker, a valve cover, etc.

[0004] When a fire occurs, the current flue check valve will be filled with a large amount of toxic and harmful gases and toxic smoke in the flue. Because the temperature and pressure in the flue are high and the pressure difference between the inside and outside is large when a fire occurs, the check valve plate will be slightly open or fully open, and the valve plate will be slightly open or fully open for a long time, causing toxic gases or toxic smoke to flow back into the room where the fire has not occurred due to convection of cold and hot air, causing harm to people in the room where the fire has not occurred. Utility Model Content

[0005] The utility model aims to provide a flue fire and smoke check valve to prevent toxic gases caused by disasters on other floors from entering rooms where no disaster has occurred.

[0006] The above technical purpose of the utility model is achieved through the following technical scheme: the flue fire and smoke check valve includes: an installation component, a non-return component and a locking component.

[0007] The installation component is used for connection with the wall and for installing the anti-return component and the locking component, and a flue is arranged in the middle of the installation component;

[0008] The installation component is a common technology in this field. It is usually a rectangular installation plate with a circular hole in its geometric center. A hollow tube with a length of 20 cm is installed on the smoke outlet surface. The installation component is made of high temperature resistant materials such as ABS plastic and metal.

[0009] The anti-return component is arranged in the flue;

[0010] The anti-return assembly comprises a mounting plate which is installed obliquely toward the smoke outlet direction of the flue, and a valve plate is hingedly provided on the smoke outlet surface of the mounting plate;

[0011] The valve plate is installed at an angle. This can ensure that the valve plate automatically falls back to its original position due to its own weight when the wind pressure disappears, without affecting the wind pressure blowing the valve plate to exhaust air, thereby eliminating the need to install a rebound component.

[0012] The locking assembly is arranged on the mounting plate;

[0013] The locking assembly includes a limiting column installed on the smoke outlet surface of the mounting plate and a limiting rocker arm hinged on the limiting column, a locking spring is arranged on the hinge point between the limiting rocker arm and the limiting column, and a fuse is arranged at one end of the limiting column away from the limiting column.

[0014] When the fuse is melted, the locking spring causes the limit rocker arm to abut against the valve plate.

[0015] When the fuse is melted by the high temperature in the flue, the locking spring causes the limit rocker arm to rebound, blocking the movement direction of the valve plate and abutting against the valve plate, thereby fixing the valve plate and preventing the valve plate from being opened due to the pressure difference caused by the temperature difference, thereby preventing the backflow of toxic gases.

[0016] The utility model is further configured as follows: two symmetrically arranged flue holes are provided on the mounting plate, a mounting structure is provided between the two flue holes, the limiting column is fixedly provided at the middle part of the mounting structure, two symmetrically arranged limiting rocker arms are hinged on the limiting column, and the locking spring for resetting the limiting rocker arm is provided on the limiting column.

[0017] Two symmetrically arranged flue holes can provide an installation structure in the middle to realize the installation of the limit column, and then by setting two corresponding limit rocker arms, the locking spring can be cooperated to drive the two limit rocker arms at the same time. It can also meet the needs of most flue check valves on the market, making its application more extensive.

[0018] The utility model is further configured as follows: a flat groove is provided along the radial direction of one end of the limiting column away from the mounting structure.

[0019] The flat groove is a three-sided open groove with a U-shaped cross-section. It provides an installation position for the limit rocker arm and also forms a dead point of the limit rocker arm, preventing the limit rocker arm from losing its limiting effect due to excessive rebound of the locking spring.

[0020] The utility model is further configured as follows: the locking spring is a locking torsion spring.

[0021] The installation of torsion springs is more convenient.

[0022] The utility model is further configured as follows: the limiting rocker arm includes a support rod, a hinge hole located at one end of the support arm, a right-angle portion located next to the hinge hole, a recessed portion located on the side of the hinge hole away from the right-angle portion, and an arc portion located on the recessed portion close to the end of the support rod, and an abutment portion that abuts against the valve plate is provided at one end of the support rod away from the hinge hole.

[0023] The support rod is a hollow rod of a U-shaped component. After such an arrangement, the ends of the two support rods can be better installed on the limit column with large and small structures at the same time to save space. The arc portion next to the hinged portion can prevent interference with the stroke movement in the flat groove. The arrangement of the right-angle portion is to form an effect that the limit rocker arm can only move 90° through the interference of the right-angle portion with the stroke movement of the flat groove surface, so that after the locking torsion spring is installed, the two limit rocker arms that are close together have one and only one fixed position. The vertical arrangement of the abutment portion can directly make up for the position gap between the support rod and the valve plate.

[0024] The utility model is further configured as follows: the right-angle portion is located at a side of the support rod away from the limiting column.

[0025] The right-angle portion is located on the side away from the support rod to form a limiting effect under normal working conditions.

[0026] The utility model is further configured as follows: the arc portion is located on a side of the support rod close to the limiting column.

[0027] The arc portion can achieve the operating principle of no motion interference on the side close to the support rod.

[0028] The utility model is further configured such that: the axial direction of the abutting portion is perpendicular to the plane of the valve sheet.

[0029] The abutting portion is perpendicular to the plane of the valve sheet and can form a good supporting effect.

[0030] The utility model is further configured as follows: a fixing hole is provided at one end of the support rod close to the abutting portion, and the fixing hole is located at a side of the support rod away from the abutting portion.

[0031] The setting of the fixing hole enables the fuse piece to simultaneously connect two branches through the fastening bolts to close the two branches, and also enables a support rod to be fixed in a certain direction when it exists.

[0032] The utility model is further configured as follows: a mounting shaft coaxial with the limiting column is arranged in the flat groove, the locking torsion spring is sleeved on the mounting shaft, one end of the limiting rocker arm is hinged to the mounting shaft, and the locking torsion spring abuts against the limiting rocker arm.

[0033] After the installation shaft is installed, the installation of the limit rocker arm can be more convenient.

[0034] To sum up, the utility model has the following beneficial effects: when the fuse is melted by the high temperature in the flue, the locking torsion spring causes the limit rocker arm to rebound, blocks the movement direction of the valve plate and abuts against the valve plate, thereby achieving the effect of fixing the valve plate, preventing the valve plate from being opened due to the pressure difference caused by the temperature difference, thereby achieving the effect of preventing the backflow of toxic gases. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a three-dimensional diagram of the first state of the check valve in the embodiment of the utility model;

[0036] Figure 2 It is a perspective view of the second state of the check valve in the embodiment of the utility model;

[0037] Figure 3 In the present utility model embodiment Figure 3 A cross-sectional view of

[0038] Figure 4 It is the fuse state of the locking structure on the mounting plate in the embodiment of the utility model;

[0039] Figure 5 It is the non-fuse state of the locking structure on the mounting plate in the embodiment of the utility model;

[0040] Figure 6 It is a schematic cross-sectional structural diagram of a limiting column in an embodiment of the utility model;

[0041] Figure 7 It is a schematic diagram of the structure of the valve plate in the embodiment of the utility model;

[0042] Figure 8 It is a structural schematic diagram of a limit rocker arm in an embodiment of the utility model;

[0043] Fig. 9 It is a schematic structural diagram of a limiting column in an embodiment of the utility model.

[0044] In the figure:

[0045] 1. Installation assembly; 11. Valve body shell; 12. Installation plate; 121. Installation structure; 122. Flue hole; 13. Hinge support;

[0046] 2. Check assembly; 21. Valve plate; 22. Rotating shaft;

[0047] 3. Locking assembly; 31. Limiting column; 311. Flat groove; 312. Mounting shaft; 32. Limiting rocker arm; 321. Abutment portion; 322. Support rod; 3221. Fixing hole; 3222. Hinge hole; 323. Recessed portion; 324. Arc portion; 325. Right-angle portion; 33. Fuse piece; 34. Locking torsion spring. DETAILED DESCRIPTION

[0048] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0049] It should be noted that if the terms "first", "second", etc. are involved in the specification and claims of the utility model and the above-mentioned drawings, they are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to describe the embodiments of the utility model described here. In addition, if the terms "including" and "having" and any of their variations are involved, it is intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0050] In addition, in the present invention, the terms "installation", "setting", "provided with", "connection", "connected", "socketing" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0051] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0052] The following is combined with Figure 1-9 The utility model is described in further detail.

[0053] Example

[0054] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9As shown, the flue fire and smoke check valve includes: an installation component 1, a check component 2 and a locking component 3.

[0055] The installation component 1 is used for connection with a wall and for installing a non-return component 2 and a locking component 3 . A flue is arranged in the middle of the installation component 1 .

[0056] The installation component 1 is a common technology in this field. It is usually a rectangular installation plate with a circular hole in its geometric center. A hollow tube with a length of 20 cm is installed on the smoke outlet surface. The installation component 1 is made of high temperature resistant materials such as ABS plastic and metal.

[0057] The above is common knowledge in the art and will not be explained in detail.

[0058] The anti-return component 2 is arranged in the above-mentioned flue.

[0059] The anti-return assembly 2 comprises a mounting plate 12 which is installed obliquely toward the smoke outlet direction of the flue, and a valve plate 21 is hingedly provided on the smoke outlet surface of the mounting plate 12 .

[0060] In this embodiment, in order to ensure the airtightness between the mounting plate and the flue, the mounting plate 12 can be stamped integrally with the flue, or can be welded and sealed and fixedly connected later.

[0061] The valve plate 21 is installed at an angle, which can ensure that the valve plate 21 automatically falls back to its original position due to its own weight when the wind pressure disappears, without affecting the wind pressure blowing the valve plate 21 to exhaust air, thereby eliminating the need to install a rebound component.

[0062] In this embodiment, a positioning point is provided on the valve plate 21, and the positioning point is a truncated cone-shaped stamping structure. The valve plate 21 is provided with a sealing strip along its circumference, and when the valve plate 21 is in a closed state, the sealing strip is in contact with the mounting plate 12 and the valve plate 21 at the same time to form an airtight seal;

[0063] When the limiting rocker arm 32 is released, the end of the abutting portion 321 directly abuts against the positioning point, so that the valve plate 21 is forced to form a tight fit with the mounting plate 12 .

[0064] In order to ensure the air tightness of the above preferred embodiment, a counterweight is provided on the valve plate 21 , and the counterweight is integrally formed with the valve plate 21 .

[0065] The locking assembly 3 is arranged on the mounting plate 12;

[0066] The locking assembly 3 includes a limiting column 31 installed on the smoke outlet surface of the mounting plate 12 and a limiting rocker arm 32 hinged on the limiting column 31. A locking spring for the limiting rocker arm 32 to rebound is arranged at the hinge point between the limiting rocker arm 32 and the limiting column 31. A fuse 33 is arranged at one end of the limiting column 31 away from the limiting column 31.

[0067] In the present embodiment, the fuse pieces 33 are preferably disposed at the ends of the two limit rocker arms 32 .

[0068] In this embodiment, the most preferred locking spring is a locking torsion spring 34 .

[0069] When the fuse piece 33 is melted, the locking torsion spring 34 causes the limit rocker arm 32 to abut against the valve plate 21 .

[0070] When the fuse 33 is melted by the high temperature in the flue, the locking torsion spring 34 causes the limit rocker arm 32 to rebound, blocking the movement direction of the valve plate 21 and abutting against the valve plate 21, thereby fixing the valve plate 21 and preventing the valve plate 21 from being opened due to the pressure difference caused by the temperature difference, thereby preventing the backflow of toxic gases.

[0071] like Figure 1-7 As shown, the mounting plate 12 is provided with two flue holes 122 symmetrically arranged with each other, a mounting structure 121 is arranged between the two flue holes 122, a limiting column 31 is fixedly arranged in the middle of the mounting structure 121, two limiting rocker arms 32 symmetrically arranged are hingedly arranged on the limiting column 31, a locking torsion spring 34 is sleeved on the limiting column 31, and the torsion rod of the locking torsion spring 34 abuts against the limiting column 31 closest to it;

[0072] Two symmetrically arranged flue holes 122 can provide an installation structure 121 in the middle to realize the installation of the limit column 31, and then by setting two corresponding limit rocker arms 32, the locking torsion spring 34 can be cooperated to simultaneously drive the two limit rocker arms 32, which can also meet the needs of most flue check valves on the market, making its application more extensive.

[0073] like Fig. 9 As shown, a flat groove 311 larger than half of the diameter of the limiting column 31 is formed along its radial direction at one end of the limiting column 31 away from the mounting structure 121;

[0074] The flat groove 311 is a three-sided open groove with a U-shaped cross-section, which provides an installation position for the limiting rocker arm 32 and also forms a dead point for the limiting rocker arm 32 to prevent the limiting effect of the limiting rocker arm 32 from being lost due to excessive rebound of the locking torsion spring 34.

[0075] like Fig. 9 As shown, the depth of the flat groove 311 is two-thirds of the diameter of the limiting column 31;

[0076] The depth of the flat groove 311 is two-thirds of the depth of the limiting column 31. The optimal setting is that the limiting rocker arm 32 rotates around the axis of the limiting column 31 to prevent the asymmetric rotation position of the two sides. The single-column setting of the limiting column 31 can save more installation space.

[0077] like Figure 8As shown, the limiting rocker arm 32 includes a support rod, a hinge hole 3222 at one end of the support arm, a right angle portion 325 located beside the hinge hole 3222, a recessed portion 323 located on a side of the hinge hole 3222 away from the right angle portion 325, and an arc portion 324 located at the recessed portion 323 close to the end of the support rod. An end of the support rod away from the hinge hole 3222 is provided with an abutting portion 321 abutting against the valve plate 21.

[0078] The support rod is a hollow rod of a U-shaped member. After such arrangement, the ends of the two support rods can be installed on the limit column 31 with a large and a small structure at the same time, which saves more space. The hollow rod of the U-shaped mechanism can reduce weight and achieve lightweight and cost reduction effects without being disturbed in the mechanical structure.

[0079] The arc portion 324 beside the hinge portion can prevent interference with the stroke movement in the flat groove 311;

[0080] The right angle portion 325 is arranged to form an effect that the limit rocker arm 32 can only move 90 degrees through the interference of the right angle portion 325 and the flat groove 311, so that after the locking torsion spring 34 is installed, the two limit rocker arms 32 that are close together have only one fixed position;

[0081] The vertical arrangement of the abutting portion 321 can directly make up for the position gap between the support rod and the valve plate 21 , and the frustum structure of the positioning point can make the valve plate 21 and the mounting plate 12 form a tight fit.

[0082] The right angle portion 325 is located on a side of the support rod away from the limiting column 31;

[0083] The right-angle portion 325 is located at a side away from the support rod so as to form a limiting effect under normal working conditions.

[0084] The arc portion 324 is located on one side of the support rod close to the limiting column 31;

[0085] The arc portion 324 can form an operation principle without motion interference on the side close to the support rod.

[0086] The axial direction of the abutting portion 321 is perpendicular to the plane of the valve plate 21;

[0087] The abutting portion 321 is perpendicular to the plane of the valve plate 21 and can form a good supporting effect.

[0088] A fixing hole 3221 is provided at one end of the support rod close to the abutting portion 321 , and the fixing hole 3221 is located at a side of the support rod away from the abutting portion 321 ;

[0089] The setting of the fixing hole 3221 enables the fuse piece 33 to simultaneously connect the two branches 322 through the fastening bolts to close the two branches, and also enables a support rod to be fixed in a certain direction when it exists.

[0090] In this embodiment, after the two limiting rocker arms 32 are brought together, two ends of the fuse piece 33 are respectively fixed on the fixing holes 3221 on different limiting rocker arms 32 .

[0091] An installation shaft 312 coaxial with the limiting column 31 is provided in the flat groove 311, and a locking torsion spring 34 is sleeved on the installation shaft 312. One end of the limiting rocker arm 32 is hinged to the installation shaft 312, and the locking torsion spring 34 abuts against the limiting rocker arm 32. After the installation shaft 312 is installed, the installation of the limiting rocker arm 32 can be more convenient.

[0092] Locking process: when the fuse 33 is melted by the high temperature in the flue, the locking torsion spring 34 causes the limit rocker arm 32 to rebound, blocks the movement direction of the valve plate 21 and abuts against the valve plate 21, thereby achieving the effect of fixing the valve plate 21, preventing the valve plate 21 from being opened due to the pressure difference caused by the temperature difference, thereby achieving the effect of preventing the backflow of toxic gases.

[0093] It should be noted that all features disclosed in this specification, or steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, can be combined in any manner.

[0094] In addition, the above specific embodiments are exemplary, and those skilled in the art can come up with various solutions inspired by the disclosure of the utility model, and these solutions also belong to the disclosure scope of the utility model and fall within the protection scope of the utility model. Those skilled in the art should understand that the utility model specification and its drawings are illustrative and do not constitute a limitation of the claims. The protection scope of the utility model is defined by the claims and their equivalents.

Claims

1. Flue fire and smoke check valve, characterized in that: include: An installation component (1) is used for connection with a wall surface and for installing a non-return component (2) and a locking component (3), wherein a flue is provided in the middle of the installation component (1); A backflow prevention component (2) is arranged in the flue; The anti-return assembly (2) comprises a mounting plate (12) which is installed obliquely toward the smoke outlet direction of the flue, and a valve plate (21) is hingedly provided on the smoke outlet surface of the mounting plate (12); A locking assembly (3) is arranged on the mounting plate (12); The locking assembly (3) comprises a limiting column (31) mounted on the smoke outlet surface of the mounting plate (12) and a limiting rocker arm (32) hinged on the limiting column (31); a locking spring is arranged at a hinge point between the limiting rocker arm (32) and the limiting column (31); and a fuse (33) is arranged at one end of the limiting column (31) away from the limiting column (31); When the fuse piece (33) is melted, the locking spring causes the limit rocker arm (32) to expand and abut against the valve piece (21).

2. The flue fire and smoke check valve according to claim 1 is characterized in that: The mounting plate (12) is provided with two flue holes (122) symmetrically arranged with each other, a mounting structure (121) is arranged between the two flue holes (122), a limiting column (31) is fixedly arranged in the middle of the mounting structure (121), two symmetrically arranged limiting rocker arms (32) are hingedly arranged on the limiting column (31), and a locking spring for resetting the limiting rocker arm (32) is arranged on the limiting column (31).

3. The flue fire and smoke check valve according to claim 2 is characterized in that: One end of the limiting column (31) away from the mounting structure (121) is provided with a flat groove (311) along its radial direction.

4. The flue fire and smoke check valve according to claim 3 is characterized in that : The locking spring is a locking torsion spring (34).

5. The flue fire and smoke check valve according to claim 4 is characterized in that: The limit rocker arm (32) comprises a support rod (322), a hinge hole (3222) located at one end of the support rod (322), a right angle portion (325) located beside the hinge hole (3222), a recessed portion (323) located on the side of the hinge hole (3222) away from the right angle portion (325), and an arc portion (324) located on the recessed portion (323) close to the end of the support rod (322), and an abutting portion (321) abutting against the valve plate (21) is provided at one end of the support rod (322) away from the hinge hole (3222).

6. The flue fire and smoke check valve according to claim 5, characterized in that: The right-angle portion (325) is located on a side of the support rod away from the limiting column (31).

7. The flue fire and smoke check valve according to claim 5, characterized in that: The arc portion (324) is located on a side of the support rod close to the limiting column (31).

8. The flue fire and smoke check valve according to claim 5, characterized in that: The axial direction of the abutting portion (321) is perpendicular to the plane of the valve plate (21).

9. The flue fire and smoke check valve according to claim 6, characterized in that: A fixing hole (3221) is provided at one end of the support rod close to the abutment portion (321), and the fixing hole (3221) is located on a side of the support rod away from the abutment portion (321).

10. The flue fire and smoke check valve according to claim 5, characterized in that: The flat groove (311) is provided with a mounting shaft (312) coaxial with the limiting column (31), the locking torsion spring (34) is sleeved on the mounting shaft (312), one end of the limiting rocker arm (32) is hinged to the mounting shaft (312), and the locking torsion spring (34) is in contact with the limiting rocker arm (32).

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