Fire extinguishing equipment including sensing joints and sensing joints

Abstract

To provide a fire-sensitive joint that can readily adjust a valve element and improve the yield of product, and to provide a fire-fighting installation including the fire-sensitive joint.SOLUTION: A fire-sensitive joint includes: a body forming a flow channel for connecting primary-side piping filled with fire extinguishing liquid to secondary-side piping including an open type head and including a valve seat surrounding the flow channel; a valve element for blocking the valve seat; and a heat-sensitive part pressing the valve element to the valve seat and, when detecting a fire, releasing the pressing of the valve element. The valve element includes: a disk covering the valve seat; a projection that projects on a side of the primary-side piping from the disk; and a seal material for sealing between the projection and the flow channel.SELECTED DRAWING: Figure 2

Description

Technical Field

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[0001] The present invention relates to a sensing joint and a fire extinguishing facility including the sensing joint.

Background Art

[0002] For example, Patent Document 1 (Japanese Patent Application Laid-Open No. 2016-202577) discloses a heat-sensitive release joint having a main body having a pipe connection port, a head connection port, and a heat-sensitive part attachment port, a heat-sensitive part connected to the heat-sensitive part attachment port, and a valve body that seals the pipe connection port and the head connection port so as not to communicate with each other. In this heat-sensitive release joint, the valve body has a protrusion at the rear end, and a disc spring is provided on the protrusion. The disc spring is pressed against the pipe connection port by the force of the heat-sensitive body pressing the valve body, thereby sealing the pipe connection port.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the heat-sensitive release joint disclosed in Patent Document 1, it is difficult to appropriately adjust the disc spring so as to seal the pipe connection port, and moreover, the product yield is poor.

[0005] <了 Therefore, an object of the present invention is to provide a sensing joint that can easily adjust the valve body and improve the product yield, and a fire extinguishing facility including the sensing joint.

Means for Solving the Problems

[0006] To solve the above-described problems, the present invention forms a flow path connecting a primary-side pipe filled with a fire extinguishing liquid and a secondary-side pipe provided with an open-type head, and has a main body having a valve seat surrounding the flow path, A valve body that closes the valve seat, The valve body is pressed against the valve seat, and a heat-sensitive part is provided that releases the pressure on the valve body when it detects a flame, The valve body includes a disc covering the valve seat, a projection extending from the disc toward the primary side piping, and a sealing material sealing the space between the projection and the flow path. We provide a sensing joint characterized by the following.

[0007] Furthermore, in the sensing joint of the present invention, it is preferable that the sealing material is an O-ring attached to the outer circumferential surface of the protruding portion.

[0008] Furthermore, in the sensing joint of the present invention, it is preferable that a groove is formed along the circumferential direction on the outer surface of the protruding portion, and that the sealing material is fitted into the groove.

[0009] The present invention also provides a fire extinguishing system that includes a sensing joint as described in any of the above. [Effects of the Invention]

[0010] The present invention provides a sensing joint and a fire extinguishing system including the sensing joint that can easily adjust the valve body and improve the product yield. [Brief explanation of the drawing]

[0011] [Figure 1] This is a schematic diagram showing an example of the configuration of the fire extinguishing system 1 according to this embodiment. [Figure 2] This is a cross-sectional view of the sensing joint 10 under normal conditions. [Figure 3] This is a cross-sectional view of the sensing joint 10 in its open state. [Figure 4] This is a cross-sectional view of the sensing joint 10 in a state where the water pressure has decreased after opening. [Modes for carrying out the invention]

[0012] Hereinafter, typical embodiments of the sensing joint and fire extinguishing system according to the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to these drawings. Furthermore, since the drawings are for conceptual explanation of the present invention, dimensions, ratios, or numbers may be exaggerated or simplified for ease of understanding.

[0013] Fire extinguishing equipment 1 is equipment that extinguishes fires using a fire extinguishing liquid (for example, fire extinguishing water, foam solution, etc.), and examples include sprinkler systems, water spray fire extinguishing systems, and foam fire extinguishing systems. As shown in Figure 1, the fire extinguishing system 1 includes piping (primary side piping 2 and secondary side piping 3), a sensing fitting 10, heads (closed type head 4 and open type head 5), and also a pressurizing pump and water tank (not shown). Here, the piping upstream of the sensing fitting 10 will be called the primary side piping 2, and the piping downstream of the sensing fitting 10 will be called the secondary side piping 3.

[0014] The primary side piping 2 is connected to a pressurizing pump (not shown), and is filled with fire extinguishing liquid when the fire extinguishing equipment 1 and the sensing fitting 10 are in use (monitoring). In other words, the primary side piping 2 supplies fire extinguishing liquid to the closed-type head 4 and the sensing fitting 10. The closed-type head 4 is a fire extinguishing head that integrates a heat-sensing function and a water-spraying function.

[0015] The sensing joint 10 is used when there are obstacles 6 such as exposed ceiling ducts or lattice ceilings. When the sensing joint 10 detects a fire, it opens the valve body 13 and supplies fire extinguishing liquid to the open-type head 5 via the secondary side piping 3. In other words, by installing the sensing joint 10 as a fire detection unit at the bottom of the ceiling surface, and further installing the open-type head 5 as a water spraying unit below the obstacle, effective fire detection and water spraying are made possible. Details of the sensing joint 10 will be described later.

[0016] The base end of the secondary pipe 3 is connected to the sensing fitting 10, and the tip end is connected to the open-type head 5. During monitoring, the fire extinguishing liquid in the primary pipe 2 is sealed by the sensing fitting 10, so the secondary pipe 3 is empty (filled with air).

[0017] Next, the sensing joint 10 will be described in detail. As shown in FIG. 2, the sensing joint 10 includes a main body 11, a valve body 13, a heat sensing part 15, and a frame 17.

[0018] The main body 11 forms a flow path 113 that connects the primary side pipe 2 and the secondary side pipe 3. The main body 11 is made of, for example, a metal material.

[0019] The main body 11 is connected to the primary side pipe 2 at the end 111 and to the secondary side pipe 3 at the end 112. Since the primary side pipe 2 and the secondary side pipe 3 are connected at the ends 111 and 112 at a substantially right angle, the flow path 113 of the main body 11 is bent in a substantially L shape.

[0020] A valve seat 114 is formed so as to surround the flow path 113 of the main body 11. The valve body 13 is placed on the valve seat 114. Here, the valve seat 114 is formed by making the inner diameter of the reduced diameter part 115 located upstream of the valve seat 114 in the flow path 113 smaller than the inner diameter of other parts (see FIG. 3). The length of the reduced diameter part 115 (the distance measured from the valve seat 114 toward the upstream side) is preferably substantially equal to or larger than the thickness of the protruding part 133 described later. Thereby, the sealing of the flow path 113 (reduced diameter part 115) by the protruding part 133 and the sealing material 134 is ensured.

[0021] A frame 17 is attached to the position of the main body 11 facing the valve seat 114. The frame 17 is a metal member that holds the valve body 13 and the heat sensing part 15. The frame 17 has a screw 171 that presses the end of the heat sensing part 15. The frame 17 also has a through hole 172 that communicates the inside and the outside of the flow path 113 of the main body 11.

[0022] The valve body 13 closes the valve seat 114 (or the reduced diameter part 115) to stop the fire extinguishing liquid in the primary side pipe 2. The valve body 13 includes a rod 131, a disk 132, a protruding part 133, and a sealing material 134.

[0023] The rod 131 is inserted through the through hole 172 of the frame 17. A recess is formed at one end 131A of the rod 131, and the tip of the heat-sensing part 15 is inserted into this recess. In this state, the other end of the heat-sensing part is pressed by the screw 171, causing the valve body 13 to close the flow path 113 of the main body 11. The outer diameter of the other end 131B of the rod 131 is larger than the inner diameter of the through hole 172 in the frame 17. When the valve body 13 is opened and moves towards the frame 17 due to water pressure, the end 131B of the rod 131 closes the through hole 172 in the frame 17, suppressing leakage of fire extinguishing liquid from the through hole 172.

[0024] The disc 132 is attached to the end 131B of the rod 131 and covers the valve seat 114. Here, the disc 132 is a disc-shaped or ring-shaped metal plate with an outer diameter larger than the inner diameter of the valve seat 114.

[0025] The protruding portion 133 extends from the disc 132 (or the end 131B of the rod 131) toward the primary side piping 2. The protruding portion 133 is cylindrical and has an outer diameter slightly smaller than the inner diameter of the reduced diameter portion 115. The protruding portion 133 has a groove along its circumference, and a sealing material 134 is attached to this groove.

[0026] The sealing material 134 is attached to the outer circumferential surface of the projection 133 to seal the space between the projection 133 and the flow path 113 of the main body 11 (i.e., the reduced diameter portion 115). The sealing material 134 is, for example, an O-ring and may be made of resin or rubber. When attached to the outer circumference of the projection 133, it has an outer diameter larger than the inner diameter of the reduced diameter portion 115. As a result, once the valve body 13 comes off the valve seat 114, it cannot be returned to its original position.

[0027] The heat-sensing element 15 presses the valve body 13 against the valve seat 114, and releases the pressure on the valve body 13 when it detects a flame. The heat-sensing element 15 is, for example, a glass valve, which presses the end 131A of the rod 131 at one end and is pressed by the screw 171 at the other end.

[0028] Therefore, when the pressure on the valve body 13 by the heat-sensitive part 15 is released and the fire extinguishing liquid flows from the primary side pipe 2 to the secondary side pipe 3, the valve body 13 does not return to its original position and maintains the open state of the primary side pipe 2 (see Figure 4). In other words, once the valve body 13 is opened, the lower part of the protruding part 133 may enter the reduced diameter part 115, but it is easily pushed up by the fire extinguishing liquid from the primary side pipe 2, allowing the fire extinguishing liquid to flow into the secondary side pipe 3.

[0029] Next, the operation of the fire extinguishing equipment 1 and the sensing joint 10 will be explained. During alarm operation, the valve body 13 of the sensing joint 10 stops the flow of fire extinguishing fluid in the primary side piping 2, preventing leakage to the secondary side piping 3 and the open-type head 5 (see Figure 2). In this case, the valve body 13 not only covers the valve seat 114 with the disc 132, but the protrusion 133 and sealing material 134 also seal the reduced diameter portion 115, thereby stopping the fire extinguishing fluid in the primary side piping 2. This eliminates the need to precisely match the dimensions and shape of the disc 132 to the valve seat 114, simplifying the adjustment of the valve body 13. Consequently, the yield of the sensing joint 10 can be significantly improved.

[0030] When the sensing joint 10 detects a flame, the heat-sensitive part 15 releases pressure on the valve body 13, for example, by rupturing. The valve body 13 is pushed to the secondary side by the water pressure in the primary side piping 2, releasing the seal between the primary and secondary sides (see Figure 3). As a result, the fire extinguishing liquid flows from the primary side piping 2 to the secondary side piping 3.

[0031] Once released, the valve body 13 does not close the flow path 113 again because the outer diameter of the sealing material 134 is larger than the inner diameter of the reduced diameter portion 115. Therefore, it does not obstruct the flow of fire extinguishing liquid from the primary side to the secondary side.

[0032] Although typical embodiments of the present invention have been described above, the present invention is not limited to these, and various design modifications are possible and are also included in the present invention. Here, an O-ring attached to the outer circumferential surface of the protrusion 133 was shown as a typical embodiment of the sealing material that seals the space between the protrusion 133 and the flow path 113, but for example, the sealing material that seals the space between the protrusion 133 and the flow path 113 may be an O-ring attached to the inner circumferential surface of the reduced diameter portion 115. [Explanation of Symbols]

[0033] 1 Fire extinguishing equipment 2 Primary side piping 3. Secondary piping 4. Closed-type head 5 Open-type head 6 Obstacles 10 Sensing joint 11 Main unit 13 Valve body 15. Heat-sensitive part 113 Flow channels 114 valve seats 115 Reduced diameter part 132 disks 133 Protrusion 134 Sealant

Claims

1. A main body having a valve seat surrounding a primary pipe filled with fire extinguishing liquid and a secondary pipe equipped with an open-type head, forming a flow path that connects the primary pipe and the secondary pipe. A valve body that closes the valve seat, The valve body is pressed against the valve seat, and a heat-sensitive part is provided that releases the pressure on the valve body when it detects a flame, The valve body includes a disc covering the valve seat, a projection extending from the disc toward the primary side piping, and a sealing material sealing the space between the projection and the flow path. A sensing joint characterized by the following.

2. The sealing material is an O-ring attached to the outer circumferential surface of the protruding portion. The sensing joint according to claim 1, characterized by the following:

3. A groove is formed on the outer surface of the protruding portion along the circumferential direction. The sealing material is fitted into the groove. The sensing joint according to claim 2, characterized in that

4. A fire extinguishing system including a sensing joint according to any one of claims 1 to 3.

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