Rain alarm valve

Abstract

The utility model is suitable for the technical field of fire fighting equipment, and provides a deluge alarm valve which comprises a valve cover, a valve body and a diaphragm, the valve cover and the valve body are oppositely arranged, the diaphragm comprises an edge part connected with the valve cover and / or the valve body and a diaphragm body connected to the inner periphery of the edge part, and the edge part comprises an outer ring supporting body; at least one part of the diaphragm body is arranged in the enclosed space and used for dividing the enclosed space between the valve deck and the valve body into a pressure cavity and a fire fighting water cavity. The outer ring supporting body is used for being connected with at least one of the valve cover and the valve body so as to support the diaphragm body outwards in the radial direction, so that the whole diaphragm is tensioned, the problem that the edge of the diaphragm shrinks inwards easily after multiple actions is reduced or even avoided, and when the pressure in the pressure cavity and the fire fighting water cavity is large, the pressure in the pressure cavity and the fire fighting water cavity is reduced. Especially when the pressure in the fire fighting water cavity is large, the problem that the edge of the diaphragm shrinks inwards is reduced or even avoided, the action reliability of the deluge alarm valve is guaranteed, and then the reliability of a deluge system is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fire-fighting equipment, in particular to a deluge alarm valve. BACKGROUND

[0002] The deluge alarm valve is a device for controlling water flow and playing an alarm role in a deluge system. The deluge alarm valve opens to let water flow into a fire-fighting pipe network for fire extinguishing when a fire occurs.

[0003] In the deluge alarm valve, a diaphragm plays a role of separating a system side and a water supply side. When the water pressure of the water supply side changes, the diaphragm is pushed to act to close or open the water supply side.

[0004] The existing deluge alarm valve has a problem that the diaphragm is prone to inward shrinkage. In some places, the diaphragm is prone to inward shrinkage after being started multiple times. In other scenarios, such as a relatively high steady pressure, the diaphragm is also prone to inward shrinkage, which affects the reliability of the deluge system and affects fire safety. CONTENT OF THE UTILITY MODEL

[0005] The purpose of the embodiment of the present application is to provide a deluge alarm valve, aiming at solving the technical problem that the existing deluge alarm valve has a diaphragm prone to inward shrinkage.

[0006] The embodiment of the present application is implemented in this way. A deluge alarm valve includes oppositely arranged a valve cover and a valve body, and a diaphragm. The diaphragm includes an edge portion and a diaphragm body connected to an inner periphery of the edge portion. The edge portion includes an outer ring support body for supporting the diaphragm body outward in a radial direction. The outer ring support body is connected with the valve cover and / or the valve body. The diaphragm body is used to divide a space between the valve cover and the valve body into a pressure chamber on a side toward the valve cover and a fire water chamber on a side toward the valve body.

[0007] In one embodiment, the outer ring support body includes a first support body protruding toward the valve cover in a thickness direction. The first support body abuts against an outer surface of the valve cover away from the pressure chamber.

[0008] In one embodiment, the outer ring support body includes a second support body protruding toward the valve body in a thickness direction. The second support body abuts against an outer surface of the valve body.

[0009] In one embodiment, an outer surface of the valve body is provided with a groove recessed in a thickness direction. The second support body is located in the groove.

[0010] In one embodiment, a depth of the groove is less than or equal to a height of the second support body.

[0011] In one embodiment, the diaphragm comprises an inner sealing layer, a reinforcing layer and an outer sealing layer which are sequentially stacked from the pressure cavity to the fire water cavity; and the outer ring support is formed by thickening at least one of the inner sealing layer, the reinforcing layer and the outer sealing layer.

[0012] In one embodiment, the outer ring support is a hard support, and the outer ring support is located between the mutually approaching surfaces of the valve body and the valve cover.

[0013] In one embodiment, the diaphragm comprises an inner sealing layer, a reinforcing layer and an outer sealing layer which are sequentially stacked from the pressure cavity to the fire water cavity; and the outer ring support is located between the inner sealing layer and the outer sealing layer.

[0014] In one embodiment, the outer ring support is provided with a through hole, and the outer sealing layer and the inner sealing layer are connected through the through hole.

[0015] In one embodiment, the hard support is a metal piece; and / or, the hard support is in the form of a closed ring.

[0016] The rain alarm valve provided by the embodiments of the present application has the following beneficial effects:

[0017] The diaphragm of the rain alarm valve provided by the embodiments of the present application comprises an edge portion and a diaphragm body, the edge portion comprises an outer ring support which is used to be connected with at least one of the valve cover and the valve body, and at least a part of the diaphragm body is arranged in the enclosed space to divide the enclosed space between the valve cover and the valve body into a pressure cavity on the side of the valve cover and a fire water cavity on the side of the valve body. The outer ring support is used to be connected with at least one of the valve cover and the valve body to support the diaphragm body outward in the radial direction, thereby tensioning the diaphragm as a whole, reducing or even avoiding the edge inward retraction problem of the diaphragm which is prone to occur after multiple actions, and reducing or even avoiding the edge inward retraction problem of the diaphragm when the pressure in the pressure cavity and the fire water cavity is relatively large, especially when the pressure in the fire water cavity is relatively large, thereby ensuring the action reliability of the rain alarm valve, and further ensuring the reliability of the rain system. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0019] Figure 1 is a cross-sectional structure schematic diagram of the rain alarm valve provided by one embodiment of the present application;

[0020] Figure 2 is Figure 1 is a structure diagram of a diaphragm in the rain alarm valve shown in FIG. 1;

[0021] Figure 3 is a cross-sectional structure diagram of a rain alarm valve provided by another embodiment of the present application;

[0022] Figure 4 is Figure 3 is an enlarged view of A in FIG. 2;

[0023] Figure 5 is a cross-sectional structure diagram of a rain alarm valve provided by another embodiment of the present application;

[0024] Figure 6 is a cross-sectional structure diagram of a rain alarm valve provided by another embodiment of the present application;

[0025] Figure 7 is Figure 6 is a structure diagram of a diaphragm in the rain alarm valve shown in FIG. 1.

[0026] The meanings of the marks in the figures are as follows:

[0027] 100 - rain alarm valve;

[0028] 1 - valve body, 10 - fire water cavity, 11 - outer blocking part, 12 - groove;

[0029] 2 - valve cover, 20 - pressure cavity;

[0030] 3 - diaphragm, 31 - edge part, 32 - outer ring support body, 320 - through hole, 321 - first support body, 322 - second support body, 33 - diaphragm body, 37 - inner sealing layer, 38 - reinforcing layer, 39 - outer sealing layer. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0032] It is to be noted that when a component is referred to as being "fixed" or "set" on another component, it can be directly or indirectly fixed or set on the other component. When a component is referred to as being "connected" to another component, it can be directly or indirectly connected to the other component. The terms "upper", "lower", "left", "right", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used for the purpose of facilitating the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the patent. The terms "first", "second" are only used for the purpose of facilitating the description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0033] Referring to Figure 1 、 Figure 3 、 Figure 5 and Figure 6 , the embodiment of the present application provides a rain alarm valve 100, which can be applied to a rain system, and is used for controlling the opening and closing of a fire-fighting system pipe network.

[0034] Specifically, the rain alarm valve 100 includes a valve cover 2 and a valve body 1 arranged oppositely, and a diaphragm 3. The valve cover 2 and the valve body 1 are both generally concave, and are connected oppositely to define a surrounding space therebetween, and the diaphragm 3 is located between the valve cover 2 and the valve body 1, wherein an edge portion of the diaphragm 3 is an edge portion 31, at least a part of the edge portion 31 is located between the end faces of the valve cover 2 and the valve body 1 close to each other, and a central portion of the diaphragm 3 is a diaphragm body 33, at least a part of the diaphragm body 33 is located in the surrounding space.

[0035] Specifically, in the embodiment of the present application, as shown in Figure 2 、 Figure 4 and Figure 7 , the edge portion 31 of the diaphragm 3 includes an outer ring support body 32, wherein the outer ring support body 32 is used to support the diaphragm body 33 outward in the radial direction, and the outer ring support body 32 is used to be connected with at least one of the valve cover 2 and the valve body 1; at least a part of the diaphragm body 33 is arranged in the surrounding space, and is used to divide the surrounding space between the valve cover 2 and the valve body 1 into a pressure cavity 20 on the side of the valve cover 2, and a fire-fighting water cavity 10 on the side of the valve body 1.

[0036] The outer ring support body 32 is used to connect with at least one of the valve cover 2 and the valve body 1, to tension the diaphragm body 33, and tension the diaphragm 3 as a whole, to reduce or even avoid the edge inward shrinkage problem of the diaphragm 3 after multiple actions, and to reduce or even avoid the edge inward shrinkage problem of the diaphragm 3 when the pressure in the pressure cavity 20 and the fire-fighting water cavity 10 is relatively large, especially when the pressure in the fire-fighting water cavity 10 is relatively large, to ensure the action reliability of the deluge alarm valve 100, and further ensure the reliability of the deluge system.

[0037] The diaphragm 3 of the deluge alarm valve 100 provided by the embodiment of the present application includes an edge part 31, and the edge part 31 includes an outer ring support body 32. The outer ring support body 32 is used to connect with at least one of the valve cover 2 and the valve body 1, at least a part of the diaphragm body 33 is arranged in an enclosed space, and the outer ring support body 32 is used to support the diaphragm body 33 outward in the radial direction, so as to tension the diaphragm 3 as a whole, to reduce or even avoid the edge inward shrinkage problem of the diaphragm 3 after multiple actions, and to reduce or even avoid the edge inward shrinkage problem of the diaphragm 3 when the pressure in the pressure cavity 20 and the fire-fighting water cavity 10 is relatively large, especially when the pressure in the fire-fighting water cavity 10 is relatively large, to ensure the action reliability of the deluge alarm valve 100, and further ensure the reliability of the deluge system.

[0038] The deluge alarm valve 100 provided by the embodiment of the present application is at least a flexible member. When the pressure in the pressure cavity 20 is relatively large, the diaphragm body 33 deforms towards the bottom of the valve body 1 and abuts against the bottom of the valve body 1, so as to close the fire-fighting water cavity 10. When the pressure in the fire-fighting water cavity 10 is relatively small, the diaphragm body 33 deforms towards the bottom of the valve cover 2, so as to open the fire-fighting water cavity 10.

[0039] Please refer to Figure 2 , Figure 4 , Figure 5 and Figure 7 , in one embodiment, the diaphragm 3 includes an inner sealing layer 37, a reinforcing layer 38 and an outer sealing layer 39 which are sequentially stacked from the pressure cavity 20 to the fire-fighting water cavity 10. The outer ring support body 32 is formed in at least one of the inner sealing layer 37, the reinforcing layer 38 and the inner sealing layer 37.

[0040] The inner sealing layer 37 is arranged towards the pressure cavity 20, and is used to adapt to the pressure change in the pressure cavity 20, so as to realize the accurate opening and closing of the deluge alarm valve 100. The material of the inner sealing layer 37 can be selected to be a material with flexibility and sealing function, such as a rubber layer, so as to provide good flexibility for the diaphragm 3, and to buffer and dampen the water flow impact from the pressure cavity 20 side.

[0041] The outer sealing layer 39 is arranged towards the fire water cavity 10 and is directly contacted by the fire water. The material of the outer sealing layer 39 can be selected from materials with flexibility, sealing property and good corrosion resistance, such as rubber, etc., so as to maintain the good sealing property between the diaphragm body 33 and the valve body 1.

[0042] The reinforcing layer 38 is used to enhance the strength and wear resistance of the outer sealing layer 39 and the inner sealing layer 37, so that the diaphragm 3 can withstand certain pressure and friction force, and ensure that the diaphragm 3 is not easily damaged or broken when the diaphragm 3 frequently operates. The specific material of the reinforcing layer 38 can be fabric, such as fiber fabric, etc.

[0043] Please refer to Figure 1 and Figure 2 It is shown that in one embodiment, the outer ring support 32 is connected to the outer surface of the valve cover 2 away from the pressure cavity 20 thereof. In this way, the outer ring support 32 is kept in shape by the fixing force applied by the outer surface of the valve cover 2, and thus the overall tension of the diaphragm 3 is ensured and the edge is prevented from being retracted.

[0044] Alternatively, as shown in Figure 2 , the outer ring support 32 includes a first support 321 extending along the thickness direction towards the valve cover 2 and protruding from the diaphragm body 33, and the first support 321 abuts against the outer surface of the valve cover 2 away from the pressure cavity 20 thereof. In the radial direction, the first support 321 is blocked by the outer surface of the valve cover 2, thereby providing a force to keep the first support 321 outside the valve cover 2.

[0045] It should be noted that at least the diaphragm body 33 in the diaphragm 3 is flexible. Therefore, the thickness direction mentioned herein can be based on the diaphragm body 33 in the undeformed state, or can refer to the direction perpendicular to the end faces of the valve cover 2 and the valve body 1 approaching each other, or can be the stacking direction of the inner sealing layer 37, the reinforcing layer 38 and the outer sealing layer 39. The above-mentioned radial direction can refer to the direction perpendicular to the thickness direction, or can be the direction generally parallel to the end faces of the valve cover 2 and the valve body 1 approaching each other.

[0046] Please refer to Figure 1 It is shown that in one embodiment, the valve cover 2 is located in the valve body 1 as a whole, and the valve cover 2 abuts against one side surface of the valve body 1. Further, the valve body 1 includes an outer blocking portion 11 located outside the valve cover 2. In this embodiment, a part of the first support 321 is located on the side surface of the valve cover 2 facing the outer blocking portion 11.

[0047] In this embodiment, the first support 321 is located on the side surface of the valve cover 2 facing the outer blocking portion 11, and the purpose of this design is to simplify the design of the outer surface of the valve cover 2, and there is no need to additionally design a surface for abutting against the first support 321.

[0048] Please refer to Figure 2 As shown, in one embodiment, the thickness T of the diaphragm 3 is generally between 0.8mm and 3mm. Among them, the height H (dimension in the thickness direction) of the first support body 321 can be between 0.2mm and 2mm. Without limitation, in specific application scenarios, the height H of the first support body 321 can have other values and ranges according to specific needs.

[0049] In this embodiment, the first support body 321 can be a closed ring, which is arranged around the periphery of the valve cover 2. Alternatively, the first support body 321 can also be a non-closed ring, for example, it is provided with one or more notches in the direction of surrounding the valve cover 2, which divides the first support body 321 into a plurality of support segments, and the plurality of support segments are kept at the periphery of the valve cover 2 and keep the diaphragm 3 overall tensioned.

[0050] In this embodiment, the first support body 321 can be a flexible support body, or a hard support body, of course, it can also be a combination of flexible support body and hard support body.

[0051] In this embodiment, the first support body 321 is arranged in at least one of the inner sealing layer 37, the reinforcing layer 38 and the outer sealing layer 39, or in other words, the first support body 321 is formed by at least one of the inner sealing layer 37, the reinforcing layer 38 and the outer sealing layer 39. Among them, for example Figure 2 As shown, the first support body 321 is designed by partially thickening the reinforcing layer 38, and the inner sealing layer 37 protrudes towards the valve cover 2, which is adapted to the surface of the reinforcing layer 38 facing the valve cover 2.

[0052] In other optional embodiments, the first support body 321 can be designed by partially thickening the inner sealing layer 37; or the first support body 321 can be designed by partially thickening the outer sealing layer 39, and the reinforcing layer 38 and the inner sealing layer 37 protrude towards the valve cover 2, which is adapted to the surface of the outer sealing layer 39 facing the valve cover 2; or the first support body 321 can be designed by partially thickening the reinforcing layer 38 and the inner sealing layer 37. Other more forms will not be exemplified and described one by one.

[0053] Please refer to Figure 3 and Figure 4 As shown, compared with the foregoing embodiments, in this embodiment, the outer ring support body 32 is replaced by being connected with the outer surface of the valve body 1. In this way, the outer ring support body 32 is kept in shape by the outer surface of the valve body 1 exerting a fixing force on the outer ring support body 32, and then the overall tension of the diaphragm 3 is guaranteed and the edge is prevented from shrinking inward.

[0054] As Figure 4As shown, specifically, the outer ring support body 32 comprises a second support body 322 extending along the thickness direction towards the valve body 1 and protruding relative to the diaphragm body 33. The second support body 322 abuts against the outer surface of the valve body 1 facing away from the fire water cavity 10 of the valve body 1. In the radial direction, the second support body 322 is blocked by the outer surface of the valve body 1, thereby providing an acting force for keeping the second support body 322 outside the valve body 1.

[0055] Further optionally, referring to Figure 4 As shown, the outer surface of the valve body 1 is provided with a groove 12 recessed along the thickness direction, and the second support body 322 is located in the groove 12.

[0056] In this embodiment, the groove 12 for accommodating the second support body 322 is provided on the valve body 1, and the purpose of this design is that no space or surface needs to be reserved between the valve cover 2 and the valve body 1 in the radial direction for the second support body 322.

[0057] Specifically, as Figure 4 As shown, the valve cover 2 and the valve body 1 can have larger end surfaces for abutting against each other and clamping at least a part of the edge portion 31. Further optionally, the valve cover 2 and the valve body 1 can be fixedly connected by, for example, fasteners (not shown) such as bolts, screws, etc. passing through the valve cover 2 and the valve body 1 along the thickness direction, and in this case, the fasteners pass through the end surfaces of the valve cover 2 and the valve body 1 abutting against each other and avoid the groove 12 and the diaphragm 3, and it can be ensured that there is enough space outside the groove 12 for arranging the fasteners.

[0058] In one embodiment, referring to Figure 4 As shown, the height h of the second support body 322 can be 0.2mm to 2mm. Without limitation, in specific application scenarios, the height h of the second support body 322 can have other values and ranges according to specific needs.

[0059] In this embodiment, the depth of the groove 12 can be designed according to the height h of the second support body 322. Specifically, the depth of the groove 12 can be less than or equal to the height h of the second support body 322. Further optionally, the depth of the groove 12 can be less than the height h of the second support body 322. The purpose of this design is to ensure that the second support body 322 is compressed along the thickness direction between the valve cover 2 and the valve body 1, thereby ensuring sufficient tension to keep the diaphragm 3 as a whole being tensioned and not edge retraction.

[0060] In this embodiment, the second support body 322 can be a closed ring. Alternatively, the second support body 322 can also be a non-closed ring, for example, it is provided with one or more notches in the direction of surrounding the diaphragm body 33, and the one or more notches divide the second support body 322 into a plurality of support segments, and the plurality of support segments are kept on the circumference of the valve body 1 and keep the diaphragm 3 as a whole being tensioned.

[0061] Correspondingly, the groove 12 can be a closed annular groove, which is arranged around the circumference of the valve body 1, at this time, the second support body 322 can be a closed annular or an open annular. Alternatively, the groove 12 can also be an open annular, for example, corresponding to each support segment of the second support body 322.

[0062] In this embodiment, the second support body 322 can be a flexible support body, or a rigid support body, of course, it can also be a combination of a flexible support body and a rigid support body.

[0063] In this embodiment, the second support body 322 can also be arranged in at least one of the inner sealing layer 37, the reinforcing layer 38 and the outer sealing layer 39, or in other words, the second support body 322 is formed by at least one of the inner sealing layer 37, the reinforcing layer 38 and the outer sealing layer 39. Among them, optionally, for example Figure 4 As shown, the second support body 322 is designed by partially thickening the reinforcing layer 38, and the outer sealing layer 39 protrudes towards the valve body 1 side by adapting to the surface of the reinforcing layer 38 towards the valve body 1.

[0064] In other optional embodiments, the second support body 322 can be designed by partially thickening the outer sealing layer 39; or the second support body 322 can be designed by partially thickening the inner sealing layer 37, and the reinforcing layer 38 and the outer sealing layer 39 protrude towards the valve body 1 by adapting to the surface of the inner sealing layer 37 towards the valve body 1; or the second support body 322 can be designed by partially thickening the reinforcing layer 38 and the outer sealing layer 39. Other more forms will not be one by one example.

[0065] Please refer to Figure 5 As shown, in one embodiment, the outer ring support body 32 can protrude towards the valve cover 2 and the valve body 1 in thickness at the same time, and abuts on the outer surface of the valve cover 2 and the outer surface of the valve body 1 respectively. That is, the outer ring support body 32 can include the first support body 321 and the second support body 322 at the same time.

[0066] Optionally, the groove 12 can still be arranged on the valve body 1 for accommodating the second support body 322. The first support body 321 can abut on the side surface of the valve cover 2 towards the outer stop portion 11. The height H of the first support body 321 and the height h of the second support body 322 can be equal or not equal. Other features of the first support body 321 and the second support body 322 can be referred to the foregoing embodiments, which will not be repeated here.

[0067] Please refer to Figure 6 and Figure 7As shown, in this embodiment, the outer ring support 32 is a hard support, and is located between the mutually approaching surfaces of the valve body 1 and the valve cover 2. In this embodiment, the outer ring support 32 is a hard support, and is embedded in the edge portion 31 of the diaphragm 3 in the thickness direction, or in other words, the outer ring support 32 is a part of the edge portion 31 in the thickness direction, which will not be deformed under pressure. That is, in the case where the interval distance L between the mutually approaching surfaces of the valve body 1 and the valve cover 2 is fixed, the arrangement of the hard support occupies a part of the height, so that the other part of the edge portion 31 of the diaphragm 3 in the thickness direction is compressed in a smaller height space, thereby increasing the compression degree of the edge portion 31 of the diaphragm 3, and the edge retraction problem of the diaphragm 3 can be reduced or even avoided. The height of the hard support is smaller than the thickness T of the other part of the diaphragm 3.

[0068] More specifically, referring to Figure 7 As shown, in this embodiment, the outer ring support 32 is located between the edges of the inner sealing layer 37 and the outer sealing layer 39. At this time, the outer ring support 32 can be a part of the reinforcing layer 38.

[0069] The outer ring support 32 can be a closed ring, or a non-closed ring.

[0070] Further, referring to Figure 7 As shown, the outer ring support 32 is provided with at least one through hole 320, and the outer sealing layer 39 and the inner sealing layer 37 can be connected in the thickness direction via the through hole 320. The purpose of such arrangement is that the outer sealing layer 39 and the inner sealing layer 37 can be connected on both sides of the reinforcing layer 38 via the through hole 320, so as to realize the embedding of the outer ring support 32 between the outer sealing layer 39 and the inner sealing layer 37. In an alternative embodiment, the outer sealing layer 39 and the inner sealing layer 37 can be integrally formed and communicated via the through hole 320, so as to ensure the overall sealing of the diaphragm 3.

[0071] In the direction around the diaphragm body 33, the through hole 320 is a non-closed ring. The through hole 320 can be one, or the number of the through holes 320 is multiple, and the multiple through holes 320 are arranged at intervals around the diaphragm body 33.

[0072] In other alternative embodiments, the hard support can be a part of the outer sealing layer 39, or a part of the inner sealing layer 37, or can be a part of two of the outer sealing layer 39, the reinforcing layer 38 and the inner sealing layer 37.

[0073] In one embodiment, the hard support body is a metal piece, for example, a stainless steel metal piece. The outer ring support body 32 of the metal piece can withstand the pressure between the bonnet 2 and the valve body 1, and the manufacturing process is mature and low in cost. Of course, in other embodiments, the hard support body can be of other materials as long as it can withstand the pressure between the bonnet 2 and the valve body 1.

[0074] The above description is merely the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A deluge alarm valve characterized by, The valve comprises oppositely arranged valve cover and valve body, and diaphragm; wherein the diaphragm comprises edge part and diaphragm body connected to inner periphery of the edge part, the edge part comprises outer ring support for supporting the diaphragm body radially outward, the outer ring support is connected with the valve cover and / or the valve body, the diaphragm body is used for dividing space between the valve cover and the valve body into pressure cavity on the side of the valve cover and fire water cavity on the side of the valve body.

2. The deluge alarm valve of claim 1, wherein, The outer ring support comprises first support projecting toward the valve cover in thickness direction, the first support abuts against outer surface of the valve cover away from the pressure cavity.

3. The deluge alarm valve of claim 1, wherein The outer ring support comprises second support projecting toward the valve body in thickness direction, the second support abuts against outer surface of the valve body.

4. The deluge alarm valve of claim 3, wherein, The outer surface of the valve body is provided with groove recessed in thickness direction, and the second support is located in the groove.

5. The deluge alarm valve of claim 4, wherein the valve body is formed of a material selected from the group consisting of bronze, brass, and stainless steel. The depth of the groove is less than or equal to the height of the second support.

6. A deluge alarm valve according to any one of claims 1 to 5, wherein The diaphragm comprises inner sealing layer, reinforcing layer and outer sealing layer arranged in sequence from the pressure cavity to the fire water cavity; the outer ring support is thickened by at least one of the inner sealing layer, the reinforcing layer and the outer sealing layer.

7. The deluge alarm valve of claim 1, wherein The outer ring support is hard support, and the outer ring support is located between mutually close surfaces of the valve body and the valve cover.

8. The deluge alarm valve of claim 7, wherein, The diaphragm comprises inner sealing layer, reinforcing layer and outer sealing layer arranged in sequence from the pressure cavity to the fire water cavity; the outer ring support is located between the inner sealing layer and the outer sealing layer.

9. The deluge alarm valve of claim 8, wherein, The outer ring support is provided with through hole, and the outer sealing layer and the inner sealing layer are connected via the through hole.

10. A deluge alarm valve according to any one of claims 7 to 9, wherein, The hard support is metal piece; and / or, the hard support is closed ring.

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