Low-pressure noise suppressor nozzle for inert gas venting systems

Abstract

A fire suppression system includes an inert gas source for supplying inert gas to a housing via a distribution conduit. The fire suppression system includes a fire suppression nozzle mounted within the housing. The fire suppression nozzle includes an inlet connected to the distribution conduit and includes a plurality of outlet orifices. During the discharge of the inert gas, the sound power level from the nozzle, according to UL 2127, is no greater than 125 dB for a coverage area of ​​up to 32 ft × 32 ft in the frequency range of 500 Hz to 10000 Hz. The nozzle disclosed herein is configured such that the gas exiting the plurality of outlet orifices is balanced.

Description

[0001] Priority declarations, cross-references & incorporations

[0002] This international application claims the benefit of U.S. Provisional Application No. 62 / 263,300, filed December 4, 2015, and U.S. Provisional Application No. 62 / 379,069, filed August 24, 2016, each of which is incorporated herein by reference in its entirety. Technical Field

[0003] This patent application relates to fire protection systems and devices, and more particularly to low-pressure noise suppressor nozzles for inert gas venting systems. Background Technology

[0004] Inert gas fire suppression systems are often used to protect equipment that might be damaged by conventional fire suppression systems using water, foam, or powder. For example, inert gas fire suppression systems can be used to protect electronic equipment such as personal computers, servers, devices in large data storage centers, and network switches. A typical fire suppression system includes a high-pressure inert gas source connected via piping to one or more inert gas exhaust nozzles. A given fire nozzle has an effective protection height and a maximum coverage area, i.e., the area where the nozzle is effective in suppressing a fire. Depending on the coverage area, one or more nozzles are installed in an enclosed space to protect the enclosure. In the event of a fire, a detector triggers the system and a control valve is opened to deliver high-pressure inert gas to the nozzles. According to the system, the high-pressure source can be connected to more than one enclosure via a network of piping terminating in multiple nozzles, and the flow rate to each enclosure can be individually controlled via corresponding control valves.

[0005] Industry regulations require fire suppression systems to meet certain standards. For example, the 2015 edition of NFPA 2001: Standard on Clean Agent Fire Extinguishing Systems (hereinafter referred to as "NFPA 2001") specifies the requirements for clean agent fire suppression systems, which is incorporated herein by reference in its entirety as background art. Section 5.8 of NFPA 2001 generally stipulates that nozzles need to be designed for their intended use and that nozzle selection should be based on limitations related to enclosure size, ground coverage, and alignment. Section 5.4.2 of NFPA 2001 requires that the method of extinguishing the fire and the concentration of the extinguishing agent comply with the second edition of ANSI / UL 2127, "Standard for Inert Gas Clean Agent Extinguishing System Units" (hereinafter referred to as "UL 2127"), which is incorporated herein by reference in its entirety as background art. UL 2127 specifies that fire suppression systems must suppress a fire within 30 seconds of the extinguishing agent being discharged, and specifies requirements for the construction of the test enclosure and the location within the enclosure used to measure the extinguishing agent concentration. According to UL 2127, the test enclosure to be constructed must have maximum area coverage for the fire suppression system or nozzle, as well as minimum and maximum protected area height limits. Therefore, each fire suppression nozzle conforming to UL 2127 is rated for maximum area coverage and minimum / maximum protected height.

[0006] To ensure that fire suppression nozzles provide coverage and protection height according to UL 2127 and reduce oxygen content within the enclosure, a large amount of inert gas is expelled into the enclosed area within a short period. To accomplish this, inert gas fire suppression systems typically expel the inert gas at supersonic speeds. Supersonic speeds generate significant turbulence, resulting in a high-power, broadband sound spectrum. That is, the high-speed gas flowing from the inert gas exhaust nozzle can cause very high sound levels. However, certain electronic components with sensitive mechanical parts (e.g., hard drives) are susceptible to adverse effects from higher sound levels. Higher sound levels can degrade the performance of these components, and in some cases, may cause them to cease operation entirely. While computer equipment can be shut down to protect acoustically sensitive components, in many cases, if the enclosure houses a critical computer system (where shutdown is unacceptable for reasons such as economics or safety), the computer equipment must remain operational even when the nozzle is expelling inert gas. Therefore, although the electronic equipment within the enclosure may itself be unaffected by the fire, it may still suffer damage and thus shutdown due to the higher sound levels caused by the inert gas exhaust.

[0007] Previous attempts in the industry to reduce the high sound levels associated with the discharge of high-speed / high-pressure gases have primarily involved limiting the flow rate of the gas into enclosed areas. For example, previous designs have included using sound-absorbing materials to block the flow inside the nozzle. However, to effectively reduce the sound level of the gas to an acceptable range, e.g., to a level that prevents hard disk failure, a significant reduction in flow rate is required, which typically means a higher pressure drop within the nozzle. This reduction in flow rate prevents the gas from being discharged at a rate sufficient to rapidly reduce oxygen content and meet current fire suppression standards. Therefore, previous attempts to reduce the sound output of fire suppression nozzles have resulted in a reduction in the effective coverage area of ​​the nozzles. That is, attempts to produce sound-reducing nozzles have led to a reduction in the maximum coverage area and / or maximum protection height. Accordingly, a larger number of sound-reducing nozzles of the related technology may be required to achieve the same coverage area as existing fire suppression nozzles. Furthermore, due to the smaller coverage area, sound-reducing nozzles of the related technology cannot directly replace (i.e., modify) existing fire suppression nozzles already installed in the housing, for example, by running new piping to install additional nozzles, without significantly modifying the system.

[0008] Accordingly, there is a need for a fire extinguishing nozzle that can rapidly expel gas and reduce the noise generated during expulsion to a level acceptable to electronic devices. Additionally, there is a need to retrofit existing fire extinguishing nozzles with noise-reducing nozzles without significantly modifying the existing system. Further limitations and disadvantages of such conventional methods of constructing inert gas nozzles will become apparent to those skilled in the art by comparing them with the embodiments of the present invention, as illustrated in the remainder of this invention with reference to the accompanying drawings. Summary of the Invention

[0009] Embodiments of the present invention relate to low-pressure sound-reducing nozzles for use in fire protection systems. The disclosed low-pressure sound-reducing nozzles are particularly suitable for use in fire protection systems. For example, preferred embodiments of the low-pressure sound-reducing nozzles are suitable for fire protection systems protecting sound-sensitive equipment (e.g., computers). The nozzle is used to reduce the sound associated with gas flow and has a sound power preferably not greater than 130 dB, more preferably not greater than 125 dB, and even more preferably not greater than 108.6 dB. When used herein, “sound power” means the sound level generated by the nozzle. Typically, when a sound level is specified for a fire extinguishing nozzle, it is the sound level that has been measured at a known distance from the nozzle. However, such sound measurement readings may be misleading relative to the actual sound level generated by the nozzle because the measured sound level may be affected by the characteristics of the housing and for other reasons. For example, acoustic measurements at a given location may be inaccurate due to potential sound absorption effects caused by the housing construction, the distance from the nozzle, and / or obstacles between the nozzle and the measurement position (which may not be disclosed or described in the reported acoustic measurement readings). Therefore, the measured sound level may not accurately represent the actual sound level generated by the nozzle. Calculations of the sound power level of an object are routine for those skilled in the art and will therefore not be discussed further herein.

[0010] Preferred embodiments of the nozzles discussed herein include nozzles tested in accordance with UL 2127. Acoustic power, frequency, pressure, coverage, flow, and physical dimensions associated with each preferred embodiment are given in nominal values. These nominal values ​​include a range of commercially acceptable values ​​around the nominal value. For example, acoustic power values ​​may be within ±5% of the nominal value, frequency values ​​within ±10% of the nominal value, pressure values ​​within ±5% of the nominal value, coverage values ​​(e.g., area and height) within ±5% of the nominal value, flow values ​​within ±10% of the nominal value, and physical dimension values ​​within ±10% of the nominal value.

[0011] Preferred embodiments of the nozzles disclosed herein are configured such that the gas exiting the plurality of outlet orifices is balanced, such that the ratio between the maximum flow value and the minimum flow value in the plurality of outlet orifices is less than 70:30, more preferably less than 60:40, and even more preferably substantially equivalent. Preferably, the nozzle is configured such that the plurality of outlet orifices are divided into two or more groups of outlet orifices having a balanced flow between the two or more groups of outlet orifices, and the ratio between the maximum set flow value and the minimum set flow value in the two or more groups of outlet orifices is less than 70:30, more preferably less than 60:40, and even more preferably substantially equivalent. Preferably, the plurality of outlet orifices are arranged along the longitudinal axis of the nozzle chamber, and the nozzle is configured to provide a balanced flow regardless of the orientation and configuration of the plurality of outlet orifices along the longitudinal axis. In some preferred embodiments, the nozzle guides the inert gas flow in the channel in a direction transverse to the inert gas flow in the channel and then divides the transverse inert gas flow into two or more balanced gas flow portions, each flowing between opposing sound-absorbing surfaces. Preferably, the ratio between the maximum and minimum flow values ​​in two or more balanced gas flow portions is less than 70:30, more preferably less than 60:40, and even more preferably the two balanced gas flow portions are substantially equivalent.

[0012] In one exemplary embodiment, the fire suppression system includes an inert gas source to supply inert gas to a housing via a distribution conduit. The system includes nozzles mounted within the housing. Each nozzle includes an inlet connected to the distribution conduit and a plurality of outlet orifices. Preferably, during the discharge of the inert gas, the sound power level from the nozzle is no greater than 125 dB for a coverage area of ​​up to 36 ft × 36 ft, and more preferably up to 32 ft × 32 ft, in the frequency range of 500 Hz to 10000 Hz. Preferably, during discharge, the pressure drop from the nozzle inlet to the plurality of outlet orifices is at most 80 psi higher than the gauge pressure of the housing. In some embodiments, the sound power level from the nozzle is no greater than 120 dB for a coverage area of ​​up to 36 ft × 36 ft, and more preferably up to 32 ft × 32 ft, in the frequency range of 500 Hz to 10000 Hz. In some embodiments, the coverage area of ​​the sound suppressor nozzle is approximately 36 ft × 36 ft, more preferably approximately 32 ft × 32 ft. Additionally, the maximum protection height of the sound suppressor nozzle is preferably 20 feet. Preferably, the sound power level is no greater than 130 dB for flow rates ranging from approximately 1000 cubic feet per minute (CFM) to approximately 5400 CFM, and more preferably at a flow rate of approximately 2188 CFM. Preferably, the sound power from the nozzle is no greater than 125 dB for a frequency range of 500 to 10000 Hz at a flow rate of approximately 2188 CFM, and more preferably no greater than 108.6 dB for a frequency range of 500 to 10000 Hz at a flow rate of approximately 2188 CFM.

[0013] In operation, in a preferred embodiment, an inert gas flow from the storage tank is delivered through an orifice plate that restricts flow and pressure. In some embodiments, the orifice plate may be mounted remotely from the nozzle. In other embodiments, the orifice plate is mounted at the nozzle inlet. The inert gas flow then enters an axially extending channel within the nozzle. The flow exits the channel through multiple outlets (which are disposed through the sidewalls of the channel) and enters the annular chamber. Preferably, the flow exits from the multiple outlets in a balanced manner to reduce the O2 content in each corner of the housing with approximately the same flow rate. Preferably, the flow is diverted through first and second sets of radially facing secondary outlets on the outer sidewall of the annular chamber. The disclosed low-pressure-drop noise suppressor nozzle reduces the noise associated with gas discharge to an acceptable level within the operating frequency range while providing a low pressure drop that allows for rapid discharge of inert gas for fire suppression.

[0014] While the exemplary embodiments discussed below relate to a configuration having two flow portions exiting the nozzle through a corresponding set of outlet orifices, a nozzle configuration having a set of outlet orifices or two or more flow portions can provide acoustic power preferably no more than 130 dB, more preferably no more than 125 dB, and even more preferably no more than 108.6 dB, provided that the flow exiting the outlet orifices is balanced as discussed herein. Attached Figure Description

[0015] The accompanying drawings, which are incorporated herein and form part of this specification, illustrate exemplary embodiments of the invention and, together with the general description given above and the specific description given below, serve to explain the features of the invention. It should be understood that preferred embodiments are examples of the invention as provided by the appended claims.

[0016] The embodiments of the low-pressure noise reduction suppressor nozzle described herein can be better understood by referring to the following specific embodiments in conjunction with the accompanying drawings, wherein the same reference numerals in the drawings denote the same or functionally similar elements:

[0017] Figure 1 A simplified view of a fire extinguishing system using an exemplary embodiment of a low-pressure noise suppressor nozzle assembly is shown.

[0018] Figure 2 for Figure 1 A three-dimensional view of the nozzle of a low-pressure noise suppressor.

[0019] Figure 3 for Figure 2 The nozzle shown is an isometric cross-sectional view.

[0020] Figure 4 for Figure 2 and 3 The isometric cross-sectional view of the nozzle shown illustrates the fluid flow through the nozzle.

[0021] Figure 5 An isometric cross-sectional view of another exemplary embodiment of a low-pressure noise suppressor nozzle.

[0022] Figure 6 An isometric cross-sectional view of another exemplary embodiment of the low-pressure noise suppressor nozzle assembly.

[0023] Figure 7 A graph is shown that illustrates the failure curves and 50% degradation curves of hard drives with various exemplary low-voltage noise suppressor nozzles in terms of sound power level and frequency. Detailed Implementation

[0024] Exemplary embodiments of the present invention relate to an inert gas nozzle that suppresses sound from the nozzle to an acceptable level without causing the high pressure drop present in the nozzle as in prior art and related systems. In exemplary embodiments, sound is reduced to an acceptable level by using only a minimal amount of acoustic damping material in the flow path of the nozzle and by strategically positioning the nozzle relative to a pressure-reducing device disposed upstream of the nozzle. For example, in some exemplary embodiments, the sound power level from the nozzle is no greater than 125 dB for a coverage area of ​​up to 36 ft × 36 ft, and more preferably up to 32 ft × 32 ft, for a frequency range of 500 to 10000 Hz. In some exemplary embodiments, the pressure-reducing device is mounted remotely from the main nozzle. In other embodiments, the pressure-reducing device is mounted at the nozzle inlet.

[0025] Typically, when a fire suppression system is activated, the inert gas pressure in the pipe upstream of a pressure-reducing device (e.g., an orifice) can be as high as 2000 psi. Depending on the construction of the protected housing, the pressure-reducing device reduces the pressure to achieve the required inert gas flow for the housing. Of course, the nozzle also introduces a pressure drop that must be considered. If the pressure drop in the nozzle is too high, the inert gas flow will not meet the design criteria for venting oxygen from the housing. In an exemplary embodiment of the invention, the disclosed low-pressure-drop nozzle has a pressure drop up to 80 psi higher than the gauge pressure of the housing. It is believed that no fire suppression nozzles of the related technology possess such low pressure drop (preferably up to 80 psi higher than the gauge pressure of the housing), low noise generation (preferably less than 125 dB and more preferably less than 108.6 dB), and high inert gas coverage area distribution (preferably up to 36 ft × 36 ft and more preferably up to 32 ft × 32 ft).

[0026] like Figure 1 As shown, the nozzle assembly 100 includes a low-pressure noise suppressor nozzle 101 and a pressure reducing device. The pressure reducing device may be, for example, an orifice plate 120. The nozzle assembly 100 is mounted in a housing 50 to protect a data storage device 52. The nozzle assembly 100 is connected to an inert gas fire suppression system via a conduit 54. The construction and operation of the fire suppression system are known in the prior art and will therefore not be discussed further for the sake of brevity. The orifice plate 120 receives high-pressure gas from the fire suppression system (not shown), and the downstream pressure in the conduit connected to the nozzle 101 is reduced via an orifice opening 122. When installed away from the nozzle 101, the orifice plate 120 is preferably coaxially mounted to the conduit 54 using suitable fittings and hardware. For example, the orifice plate 120 may be disposed within the conduit, for example, by welding, brazing, or attaching to the conduit using fittings or other suitable means. The size of the orifice opening 122 is determined according to the diameter of the conduit 54 and the application-based required flow rate in the system. Preferably, the orifice opening 122 is 5% to 70% of the diameter of the conduit 54. Figure 1As observed, the orifice plate 120 is positioned at a distance X from the inlet 102 of the main nozzle 101. Distance X is the length of the conduit from the inlet 102 to the orifice plate 120, i.e., the distance the gas travels in the conduit. In a preferred embodiment of the invention, the orifice plate 120 is positioned away from the nozzle 101. However, in other embodiments, the orifice plate 120 may be mounted directly at the inlet 102. In some embodiments, the distance X may be up to 6 feet, depending on the configuration of the fire suppression system in the housing 50. Preferably, the distance X is in the range of 30 to 50 inches, and more preferably between 35 and 45 inches. In some embodiments, the distance X is 41 inches. In some exemplary embodiments, the distance X from the inlet 102 is in the range of 0 to 12 inches, and more preferably between 3 and 9 inches. In some embodiments, the distance X is 6 inches. Preferably, the orifice plate 120 is installed such that there are no bends in the pipe 54 from the orifice plate 120 to the inlet 102. For example, the orifice plate may be installed in the vertical portion of the pipe above the nozzle 101.

[0027] As in Figure 2 As observed, nozzle 101 includes a fitting 104 configured to attach to a conduit from orifice plate 120. For example, fitting 104 may include a male thread in a female connector screwed onto conduit 54. When attached to conduit 54, suitable fittings may be used for transition from conduit 54 to fitting 104. Nozzle 101 includes a first set of secondary outlets 106 comprising a plurality of radially oriented holes 110. The first set of secondary outlets 106 is disposed between an inner annular disc 116 and a first outer annular disc 114. Nozzle 101 also includes a second set of secondary outlets 108 comprising a plurality of radially oriented holes 112. The second set of secondary outlets 108 is disposed between an inner annular disc 116 and a second outer annular disc 118. Generally, the gas received through inlet 102 is internally separated (as described more fully below) and exits through a first set of secondary outlets 106 and a second set of secondary outlets 108 between the annular disks 114, 116, and 118 for sound absorption.

[0028] refer to Figure 3 The nozzle 101 includes a longitudinally extending inner tube 126 having an inlet 102 and defining an axially extending channel 128. Preferably, when the orifice plate 120 is mounted at the nozzle 101, it is mounted at the inlet 102 of the channel 128 (see orifice plate 120 with dashed outline). Preferably, the inner tube 126 is a cylindrical tube or conduit, but the tube 126 may have other shapes. Preferably, the diameter d2 of the inlet 102 (see...) Figure 4The inner tube 126 is in the range of 1.25 to 1.75 inches, and more preferably 1.5 inches. The thickness of the inner tube 126 is in the range of 0.1 to 0.3 inches, and most preferably 0.2 inches. The inner tube 126 is appropriately sized and constructed to contain a supersonic gas flow that moves through the orifice 122 and into the channel 128. Preferably, the inner tube 126 is made of metal, such as aluminum, bronze, stainless steel, or certain other metals or materials suitable for the rated temperature of the application.

[0029] The inner tube 126 includes a set of primary outlets 130, which include a plurality of radially facing primary holes 132. In other words, the radially facing primary holes 132 extend laterally through the sidewalls of the inner tube 126. Generally, smaller diameter and a larger number of holes provide better sound loss characteristics. Preferably, the holes 132 of the primary outlets 130 are arranged in six rows, with thirty holes 132 in each row. Each of the holes 132 in a corresponding row may be in the same plane perpendicular to the longitudinal axis of the inner tube 126. The rows may be parallel to each other. Preferably, each row is offset relative to its adjacent row. In some embodiments, the offset is 6 degrees. However, in some embodiments, there is no offset, that is, the holes 132 are as... Figure 3 The holes 132 are arranged in a straight line as shown. Preferably, each hole 132 is in the range of approximately 1 / 16 inch to 1 / 4 inch in diameter, and more preferably 1 / 8 inch in diameter. In some embodiments, all holes 132 are of the same diameter. In some embodiments, the holes 132 may have different diameters. However, the diameter, number, offset, and arrangement of the holes 132 of the primary outlet 130 are not limiting, and the nozzle 101 of the present invention may include a set of primary outlets 130 having other diameters, numbers, offsets, and arrangements. For example, Figure 5 The diagram illustrates the construction of such a primary outlet 130, where five rows of orifices 132 are used instead of six. In other embodiments, the orifices 132 are not arranged in parallel rows; other arrangements or even arbitrary arrangements may be used. In some embodiments, the set of primary outlets 130 has a combined flow area larger than the flow area of ​​the orifices 122. The combined flow area of ​​the primary outlets 130 is determined based on the amount of gas flow required for the specific application. Preferably, the set of primary outlets 130 has a flow area of ​​approximately 7 to 11 inches. 2 Within the range, and more preferably approximately 8.84 in 2 The combined flow area.

[0030] The plug 138 closes the inner tube 126 to form an inner chamber corresponding to the channel 128. In some embodiments, the plug 138 may be secured to the inner tube, for example, by suitable threads, welding, or press-fit. In some embodiments, the inner tube 126 is manufactured such that the end of the channel 128 is already sealed and the plug 138 is not required. For example, the tube 126 may be formed by starting with a cylindrical blank and drilling the channel 128 to a suitable depth so that the plug 138 is not required. The inner tube 126 includes a flange 124 which is attached to the first outer annular disc 114 by suitable attachment means (e.g., a retaining ring, a retaining ring, or some other fastening means). For example, as in Figure 3 As observed, the flange 124 is attached to the support plate 154 of the first outer annular disk 114 by a plurality of fasteners 152.

[0031] In some embodiments, the sound absorber 136 (see Figure 5 The sound absorber, positioned in channel 128, reduces the interaction between the inert gas and nozzle 101 and reduces sound caused by vibrations of nozzle 101. Additionally, when using sound absorber 136, the set of primary outlets 130 may be located above sound absorber 136 to help balance the amount of gas flowing through primary orifice 132 and the uniform velocity of the inert gas. Sound absorber 136 may be composed of any suitable sound-absorbing material, such as, for example, high-temperature, high-density rigid glass fiber sound insulation. Examples of suitable glass fiber sound insulation are available from McMaster-Carr and are designated as product model 9351K1. Of course, other sound-absorbing materials, such as mineral wool or certain other suitable sound-absorbing materials, may be used. However, in other embodiments, such as... Figure 3 and 4 As shown, sound absorber 136 is not required.

[0032] The inner tube 126 is surrounded by an outer tube 134, which defines an annular chamber 135 surrounding the primary outlet 130. Preferably, the outer tube 134 is a cylindrical tube or conduit, but it may have other shapes. The outer tube 134 includes first and second sets of secondary outlets 106 and 108, respectively. Preferably, the inner diameter d3 of the outer tube 134 (see...) Figure 4 The outer tube 134 is in the range of 3.0 to 5.0 inches, and more preferably 3.81 inches. Preferably, the thickness of the outer tube 134 is in the range of 0.05 to 0.4 inches, and more preferably 0.345 inches. The outer tube 134 may be made of metal, such as aluminum, bronze, stainless steel, or certain other metals or materials suitable for the rated temperature of the application.

[0033] In some embodiments, the holes 110 and 112 of the secondary outlets 106 and 108 are arranged in four rows, with thirty-six holes 110 and 112 in each row. Each of the holes 110 and 112 in a corresponding row may lie in the same plane perpendicular to the longitudinal axis of the outer tube 134. The rows may be parallel to each other. Preferably, each row is offset relative to its adjacent row. In some embodiments, the offset is 5 degrees. However, in other embodiments, the corresponding holes 110 are in a straight line with each other, and the corresponding holes 112 are in a straight line with each other. Preferably, each hole 110 and 112 is in the range of approximately 1 / 8 inch to 1 / 2 inch in diameter, and more preferably 1 / 4 inch in diameter. In some embodiments, all the holes 110 and 112 are of the same diameter for each group of outlets 106 and 108, or even between groups of outlets 106 and 108. In some embodiments, the orifices 110, 112 may have different diameters for each set of outlets 106, 108 and / or between sets of outlets 106, 108. However, the diameter, number, and arrangement of the orifices 110, 112 of the secondary outlets 106, 108 are not limiting, and the nozzle 101 of the present invention may include a set of secondary outlets 106, 108 having other diameters, numbers, offsets, and arrangements. For example, in other embodiments, the orifices 110, 112 are not arranged in parallel rows, and the orifices 110, 112 may be arranged in other patterns or even arbitrarily. Additionally, in some embodiments, geometries other than orifices, such as slots, may be used, provided that the combined flow area of ​​the secondary outlets 106, 108 is suitable for the application.

[0034] In some embodiments, the first and second sets of secondary outlets 106 and 108 have a combined flow area larger than that of the primary outlet 130. Preferably, the first and second sets of secondary outlets 106 and 108 have a combined flow area of ​​approximately 45 to 68 inches. 2 Within the range, and more preferably approximately 56.55 inches. 2 The combined flow area. In some embodiments, the primary outlet 130 is disposed on the sidewall of the inner tube 126 so that the flow exits between secondary outlets 106, 108. Preferably, the flow exits between secondary outlets 106, 108 at equal distances. In some embodiments, the flow path from the primary outlet 130 is divided into two paths, both pointing to the corresponding secondary outlets 106, 108. In some embodiments, more than two secondary outlets are provided and the flow path from the primary outlet is divided into more than two paths.

[0035] Preferably, the sound-absorbing device is disposed in the annular chamber 135. In some embodiments, such as Figure 3As shown, the sound-absorbing device includes a baffle 140 and sound-absorbing inserts 146 and 148 disposed at the upper and lower ends of the chamber 135. The baffle 140 is disposed within the annular chamber 135 in the flow path of the inert gas. Preferably, the baffle 140 is cylindrical in shape, and its outer surface is disposed between the sidewall of the inner tube 126 and the sidewall of the outer tube 134. In some embodiments, the baffle 140 is disposed on the sidewall of the outer tube 134. Of course, the shape of the baffle is not limiting, and other shapes can be used as long as they do not adversely restrict the flow. The baffle 140 surrounds the radially facing primary aperture 132 and covers the inlets of the first and second sets of secondary outlets 106 and 108. Preferably, the thickness of the baffle 140 is in the range of 1 / 8 inch to 1 / 2 inch, and more preferably 1 / 4 inch. Preferably, baffle 140 is disposed on support plate 162 and the length of baffle 140 extends from support plate 162 to support plate 154. Baffle 140 is made of a sound-absorbing porous material. Preferably, baffle 140 is made of porous stainless steel wool sandwiched between wire mesh. The stainless steel wool can be, for example, of medium grade 1 or 0, and fine grade precision 00,000 or 0000. The wire mesh is used to hold the steel wool and can have a mesh size of, for example, 40 × 200. Of course, the grade of steel wool and the size of the wire mesh can be used appropriately. In addition, other materials can be used for baffle 140, such as, for example, cloth screen, stainless steel wool between inner and outer wire cloth, perforated metal, foam metal with various geometries and pores per inch (PPI), wire covering, Scotch Brite, and other screen materials, etc. The porous material of the baffle 140 helps reduce noise, but unlike prior art nozzles, the baffle 140 does not cause a significant pressure drop and therefore does not adversely affect the rapid removal of inert gas required for rapid reduction of oxygen content for fire suppression. This is because the throttling geometry for controlling flow remains the orifice plate 120 located upstream of the nozzle inlet 102. As discussed above, the sound-absorbing device may also include inserts 146 and 148. Preferably, sound-absorbing inserts 146 and 148 are located at the top and bottom ends of the annular chamber 135, respectively. Sound-absorbing inserts 146 and 148 help reduce the interaction between the gas flow and the nozzle 101. Preferably, sound-absorbing insert 148 is a disc having a diameter extending to the sidewalls of the baffle 140. Insert 148, together with insert 146, provides lateral support to the baffle 140. Figure 3As observed, the insert 148 serves as a base for the inner tube 126 and the plug 138. Preferably, the sound-absorbing insert 146 is an annular disc with an inner diameter that surrounds the inner tube 126. The outer diameter of the insert 146 extends to the sidewall of the baffle 140 and provides lateral support for the baffle 140. In some embodiments, the diameter of the sound-absorbing insert 148 extends to the sidewall of the outer tube 134 (e.g., see, for comparison). Figure 6 Insert 148' in the middle). Additionally, the outer diameter of insert 146 extends to the sidewall of outer tube 134 (for example, see, for comparison). Figure 6 (Insertion 146'). In this case, baffle 140 will be disposed, for example, sandwiched between inserts 146 and 148. That is, baffle 140 will be disposed on insert 148 instead of support plate 162 as discussed above, and the top of baffle 140 will extend to insert 146 instead of support plate 154 as discussed above. Although described as a disc and annular disc, the shape of the insert will depend on the shape of the inner tube and outer tube 126, 134. Sound-absorbing inserts 146, 148 can be made of any suitable sound-absorbing material, such as, for example, high-temperature, high-density rigid fiberglass sound insulation material.

[0036] As in Figure 4 As observed, the inner annular disk 116 comprises a sound-absorbing insert 172. The annular disk 116 is secured to the outer tube 134 using known fastening devices (e.g., clamps or spiral retaining rings). The sound-absorbing insert 172 further reduces the sound level of the inert gas as it flows into the housing from the first and second sets of secondary outlets 106 and 108. Preferably, the thickness of the sound-absorbing insert 172 is in the range of 0.50 inches to 2.0 inches, and more preferably 1 inch. The sound-absorbing insert 172 can be any suitable sound-absorbing material, such as, for example, fiberglass and mineral wool, etc.

[0037] The second outer annular disk 118 comprises a support plate 162 and a sound-absorbing insert 164. The support plate 162 may be made of any suitable material depending on the temperature requirements of the application, such as, for example, metals (including aluminum, bronze, and stainless steel), plastics, fiberglass, ceramics, or composites thereof. The sound-absorbing insert 164 further reduces the sound level of the inert gas as it flows from the second set of secondary outlets 108 into the housing. Preferably, the thickness of the sound-absorbing insert 164 is in the range of 0.25 inches to 1.00 inches, and more preferably 0.50 inches. The sound-absorbing insert 164 may be any suitable sound-absorbing material, such as, for example, fiberglass and mineral wool. The second outer annular disk 118 is attached to one end of the outer tube 134 by, for example, a plurality of fasteners 168 or by some other means. The first outer annular disk 114 includes a support plate 154 and a sound-absorbing insert 156. The support plate 154 can be made of any suitable material, depending on the temperature requirements of the application, such as, for example, metals (including aluminum, bronze, and stainless steel), plastics, fiberglass, ceramics, or composites thereof. The sound-absorbing insert 156 further reduces the sound level of the inert gas as it flows from the first set of secondary outlets 106 into the housing. Preferably, the thickness of the sound-absorbing insert 156 is in the range of 0.25 inches to 1.0 inch, and more preferably 0.5 inches. The sound-absorbing insert 156 can be any suitable sound-absorbing material, such as, for example, fiberglass and mineral wool. The first outer annular disc 114 is attached to another end portion of the outer tube 134 by, for example, a plurality of fasteners 160 or by some other means.

[0038] In another exemplary embodiment, as in Figure 5As observed, the inner annular disk 116' includes a support plate 170 attached to a flange 178. The flange 178 is secured to the outer tube 134, for example, by welding or by some other means (which secures the flange 178 to the outer tube 134). The support plate 170 may be made of any suitable material depending on the temperature requirements of the application, such as, for example, metals (including aluminum, bronze, and stainless steel), plastics, fiberglass, ceramics, or composites thereof. The support plate 170 is attached to the flange 178 by a plurality of fasteners 180. The inner annular disk 116' also includes a ring 176 attached to the support plate 170. A pair of sound-absorbing inserts 172' and 174' are placed on the support plate 170. The sound-absorbing inserts 172' and 174' further reduce the sound level of the inert gas as it flows from the first and second sets of secondary outlets 106 and 108 into the housing. Inserts 172' and 174' can be tightly fitted within the ring 176 and / or held within the ring by a suitable adhesive. Valves 182 and 184, respectively formed in inserts 172' and 174', provide clearance for fastener 180 and flange 178. Preferably, the thickness of each of the sound-absorbing inserts 172' and 174' is in the range of 0.25 inches to 1.0 inch, and more preferably 0.5 inches. Sound-absorbing inserts 172' and 174' can be any suitable sound-absorbing material, such as, for example, fiberglass and mineral wool, etc. The second outer annular disk 118' consists of a support plate 162, a ring 166, and a sound-absorbing insert 164. Insert 164 can be tightly fitted within the ring 166 and / or held within the ring by a suitable adhesive. The remaining structure of the annular disk 118' is similar to that of the annular disk 118 discussed above and will therefore be omitted for simplicity. The first outer annular disk 114' includes a support plate 154, a surrounding ring 158, and a sound-absorbing insert 156. The insert 156 can be tightly installed within the ring 158 and / or held within the ring by a suitable adhesive. The remaining structure of the annular disk 114' is similar to that of the annular disk 114 discussed above and will therefore be omitted for the sake of brevity.

[0039] When the fire suppression system is running, such as in, for example Figure 4As observed in the exemplary embodiment, a high-speed fluid flow F passes through the orifice 122 and is contained in the channel 128. The fluid flow F is then redirected by a plug 138 (and / or, in some embodiments, a sound absorber 136) in a direction transverse to the longitudinal channel 128 such that the fluid flow F passes through a radially facing primary outlet 132. As the fluid flow F flows through the primary outlet 132, it is divided into first and second fluid flow portions F1 and F2 in the chamber 135, respectively. In some embodiments, the first fluid flow portion F1 and the second fluid flow portion F2 are balanced. Preferably, the fluid flow portions F1 and F2 are balanced regardless of the orientation and configuration of the outlet along the longitudinal axis of the chamber 135. Preferably, the ratio between the maximum and minimum flow values ​​of the two balanced fluid flow portions F1 and F2 is less than 70:30, more preferably less than 60:40, and even more preferably, the two balanced fluid flow portions F1 and F2 are substantially equivalent. In some embodiments, fluid flows F1 and F2 are balanced by the positions of the first and second sets of secondary outlets 106 and 108 relative to the primary outlet 132. This is achieved using an inner ring 200 (see...). Figure 6 In one embodiment, the inner ring 200 can be adjusted upwards or downwards to regulate the flow rate. In some other embodiments, the balance is affected by adjusting the size of the fluid flow area of ​​each of the secondary outlets 106, 108. However, turning... Figure 4 In this embodiment, before flowing through the first and second secondary outlets 106, 108, the first and second fluid flow portions F1 and F2 pass through a sound-absorbing baffle 140. The sound-absorbing baffle 140 reduces the sound in the fluid flow portions F1 and F2, but unlike prior art nozzles, the baffle 140 does not significantly reduce the flow rate of the fluid flow portions F1 and F2. Preferably, the pressure from the nozzle inlet 102 (after the orifice plate 120) is up to 80 psi higher than the gauge pressure of the housing 50. After flowing through the baffle 140, the fluid flow portions F1 and F2 flow through the first and second secondary outlets 106, 108, respectively. As it exits the first primary outlet 106, the first fluid flow portion F1 is guided between the sound-absorbing surfaces 190 and 192 of the inserts 156 and 172, respectively, which further reduce the sound. Similarly, as it exits the secondary outlet 108, the second fluid flow portion F2 is guided between the sound-absorbing surfaces 194 and 196 of the inserts 172 and 164, respectively, which further reduce the sound.

[0040] like Figure 4As shown, nozzle 101 has a total height H and a total diameter d4. Inlet channel 128 has an inlet 102 with a diameter d2 and outer tube 134 has an inner diameter d3. Annular discs 114, 118 have a sound-absorbing insert thickness T and an annular disc 116 has a sound-absorbing insert thickness of 2T, and each sound-absorbing surface 192-196 is spaced apart by a distance Z. In some embodiments, the thickness T and the spacing Z are both in the range of approximately 0.25 inches to 1.0 inch, and preferably 0.50 inches. In at least one embodiment, the height H is in the range of approximately 4 inches to 9 inches, and preferably 5.5 inches. The diameter d4 is in the range of approximately 6 inches to 13 inches, and preferably 5.5 inches. The diameter d2 of the inner tube is in the range of approximately 1.25 inches to 1.75 inches, and preferably 1.5 inches. The diameter d3 of the outer tube is in the range of approximately 3 inches to 4 inches, and preferably 3.81 inches. In some embodiments, the following ratios may be applied to the nozzle size: d4 / d1 (which relates the nozzle diameter to the inert gas flow) is greater than 15 and preferably in the range of about 15 to 30; d3 / d2 (which ensures that chamber 135 is sufficiently large for the inert gas flow) is in the range of about 2 to 3; and d4 / T (which ensures sufficient sound absorption at the nozzle outlet) is less than 20.

[0041] Although the low-pressure noise suppressor nozzle 101 is shown and described in the above exemplary embodiments as having a cylindrical member, other suitable shapes can be used to construct the nozzle member. Furthermore, while the above exemplary embodiments are described with a sound-absorbing device having a porous baffle 140, some embodiments of the sound-absorbing device do not use a porous baffle. For example, in some embodiments, the sound-absorbing device in the annular chamber 135 may include a non-porous material that can be used to divert the gas flow from the primary outlet 130 to the secondary outlets 106, 108. For example, Figure 6 An embodiment is shown in which the sound-absorbing device includes one or more non-porous sound-absorbing rings. Because... Figure 6 Many of the nozzle structures and features are related to the above. Figure 2-5 The structures and features discussed are similar, so for the sake of brevity, specific descriptions of the common features discussed above are omitted. For example... Figure 6As shown, a sound absorber 136 is disposed in channel 128 to reduce the interaction between the incoming gas and the nozzle, and to reduce the sound caused by the vibration of the nozzle. A set of primary outlets 130 may be located above the sound absorber 136 to help balance the amount of gas flowing through the primary orifice 132 and reduce the velocity of the gas flow. As the gas exits channel 128 through the primary outlets 130, a pair of sound-absorbing rings 200 are disposed within an annular chamber 135 between the first and second sets of secondary outlets 106 and 108. Accordingly, the sound-absorbing rings 200 surround the radially facing primary orifice 132. The sound-absorbing rings 200 reduce the interaction between the gas flow and the outer tube 134. In some embodiments, the sound-absorbing rings 200 may be adjusted in size and position to help balance the gas flow through the first and second sets of secondary outlets 106 and 108. Fluid flow may be balanced by moving the rings 200 upwards and downwards relative to the primary outlet 132. In some embodiments, fluid flow is balanced by the positions of the first and second sets of secondary outlets 106 and 108 relative to the primary outlet 132. In some other embodiments, the size of the secondary outlets affects the balance. Preferably, the nozzles provide a balanced flow regardless of the orientation and configuration of the secondary outlets 106 and 108 along the longitudinal axis of the chamber 135. Preferably, the ratio between the maximum and minimum flow values ​​of the two balanced fluid flow portions is less than 70:30, more preferably less than 60:40, and even more preferably, the two balanced gas flow portions are substantially equivalent. The sound-absorbing rings 200 can be held in the outer tube 134 using, for example, washers 202 and retaining rings 204. Although the rings 200 are described as two separate rings, in some embodiments the pair of sound-absorbing rings can be combined into a single integral body. The annular chamber 135 includes sound-absorbing inserts 146' and 148' disposed at the ends of the chamber to help reduce the interaction between the gas flow and the nozzles. The construction of the inserts 146' and 148' in the chamber 135 may be similar to that of the inserts 146 and 148 and will therefore not be discussed further for the sake of brevity. The sound absorber 136 and ring 200 can be composed of any suitable sound-absorbing material, such as, for example, glass fiber or mineral wool, etc. In some embodiments, depending on the application, the nozzle of the present invention does not include the baffle 140, the sound absorber 136, or the sound-absorbing ring 200. Although described separately in the exemplary embodiments above, some embodiments may include both the baffle 140 and the ring 200. Additionally, some embodiments do not include either the baffle 140 or the ring 200.

[0042] The exemplary embodiments discussed above relate to a configuration having two flow portions exiting the nozzle through a corresponding set of outlet orifices. However, exemplary embodiments of the nozzle are not limited to this configuration. In some embodiments, the nozzle may be configured to have two or more sets of secondary outlet orifices similar to outlets 106 and 108. In other embodiments, chamber 135 has a set of secondary outlet orifices disposed along the longitudinal axis of chamber 135. Preferably, the exemplary nozzle is configured to provide a balanced flow regardless of the orientation and configuration of the plurality of outlet orifices along the longitudinal axis. For example, the nozzle is configured such that the gas exiting the plurality of outlet orifices is balanced such that the ratio between the maximum flow value and the minimum flow value in the plurality of outlet orifices is less than 70:30, and more preferably less than 60:40, and even more preferably substantially equivalent.

[0043] In the above exemplary embodiments, the acoustic power level of nozzle 101 is no greater than 130 dB for an inert gas flow rate in the range of approximately 1000 CFM to approximately 5400 CFM, and conforms to the standard in UL 2127. In some exemplary embodiments, the peak acoustic power level of nozzle 101 is no greater than 130 dB, preferably no greater than 120 dB, and more preferably no greater than 111 dB for an inert gas flow rate in the range of approximately 950 CFM to approximately 5400 CFM, and conforms to the standard in UL 2127. In some exemplary embodiments, the peak acoustic power level of nozzle 101 is in the range of 111 dB to 130 dB for an inert gas flow rate in the range of approximately 950 CFM to approximately 5400 CFM, and conforms to the standard in UL 2127. For example, Figure 7 A graph is shown illustrating the relationship between sound power level in dB and frequency in Hz for various embodiments with and without baffle 140 and with and without offset for orifice plate 120. For Figure 7 The embodiment shown uses INERGEN gas at a flow rate of 2188 CFM and an orifice of 0.368. Line A represents the sound level versus frequency curve, where a hard drive failure is considered to have occurred. Line B represents the sound level versus frequency curve, where a 50% degradation in hard drive performance is considered to have occurred. Figure 7As observed, exemplary embodiments of the invention reduce the sound power levels so that they are at or below 130 dB for frequencies from 500 to 10000 Hz, i.e., below the sound level at which a failure of the HDD is considered to occur. For example, line C represents a nozzle that does not include a remotely positioned orifice plate or a baffle with sound-absorbing material. In this embodiment, the sound power level never reaches the considered failure point of line A. Some exemplary embodiments provide even better results, where the sound power level is below 125 dB. For example, line D represents a nozzle in which an orifice plate is positioned 41 inches upstream of the nozzle inlet, but the nozzle does not have a baffle with sound-absorbing material. The sound power level of line D is generally better than that of line C, particularly from 500 Hz to about 5000 Hz, and line D has a peak of less than 125 dB at 1000 Hz. The sound power level of the exemplary embodiment represented by line D is also at or below 50% of line B for frequencies in the range of about 500 to 800 Hz and about 2000 to 10000 Hz. Line E represents a nozzle that includes a baffle with sound-absorbing material, but the orifice plate is not remotely positioned. Line E has a better sound power level than Line D over the frequency range of approximately 800 to 10000 Hz, and its peak at 500 Hz is also below 125 dB. Furthermore, Line E's sound level is 50% lower than Line B from approximately 1600 to 10000 Hz and significantly lower than Line B from approximately 2000 to 10000 Hz. Further exemplary embodiments even provide sound power levels at or below 108.6 dB. For example, Line F includes an orifice plate positioned 41 inches upstream of the nozzle inlet and includes a baffle with sound-absorbing material within the nozzle. Figure 7 As observed, except for a lower peak of about 108.6 dB at around 1000 Hz (where line F just touches the 50% degradation line B), line F is significantly below the 50% degradation line B for all other frequencies.

[0044] As discussed above, hard disk drives are susceptible to sound, and high sound levels can lead to degradation or, in some cases, failure. The exemplary embodiments disclosed above reduce or minimize the likelihood of hard disk drive degradation or failure while complying with the standards in UL 2127. For example, in some embodiments, the sound power from the sound suppressor nozzle 101 is no greater than 125 dB for a coverage area of ​​up to 36 ft × 36 ft, and more preferably up to 32 ft × 32 ft, over a frequency range of 500 to 10000 Hz, and more preferably no greater than 120 dB. It is believed that there is no fire extinguishing nozzle of the related technology that meets the UL 2127 standard and generates a sound power level of 125 dB or less for any coverage area of ​​up to 36 ft × 36 ft, and more preferably up to 32 ft × 32 ft. In some exemplary embodiments, the acoustic suppressor nozzle 101 provides a coverage area of ​​up to 36 ft × 36 ft, and more preferably up to 32 ft × 32 ft, with a frequency range of 500 to 10000 Hz that is no greater than 130 dB, and more preferably no greater than 108.6 dB. In the above exemplary embodiments, the maximum protection height of the acoustic suppressor nozzle 101 is 20 feet.

[0045] While the invention has been disclosed with reference to certain embodiments, many modifications, substitutions, and alterations to the described embodiments are possible without departing from the scope and range of the invention as defined in the appended claims. Accordingly, the invention is not limited to the described embodiments, but rather has the full scope defined by the following claims and their equivalents.

Claims

1. A fire extinguishing system, comprising: An inert gas source for supplying inert gas to the casing via a distribution pipe; A nozzle disposed within the housing, the nozzle having a plurality of radially extending outlet orifices, wherein an inert gas enters the nozzle inlet in a first flow and exits from each of the plurality of outlet orifices in a second flow perpendicular to the first flow; and A first annular disk is disposed above the plurality of outlet holes and a second annular disk is disposed below the plurality of outlet holes, wherein both the first annular disk and the second annular disk include sound-absorbing inserts, and the sound-absorbing inserts of the first annular disk and the second annular disk are configured to reduce the sound power level of the inert gas when the inert gas flows out of the plurality of outlet holes to the outside of the nozzle and passes through the gap between the first annular disk and the second annular disk. The characteristic feature is that, during the discharge of the inert gas, the sound power level from the nozzle is not greater than 125 dB for a frequency range of 500 Hz to 10000 Hz; The nozzle further includes: A first tube having an inner surface and an outer surface, the inner surface of the first tube defining an axially extending channel, the channel including an inlet at an axial end of the channel and a plurality of primary outlets disposed through a sidewall of the first tube, the primary outlets having a first combined flow area, the inlet being connected to the distribution conduit; A second tube surrounds the first tube, the inner surface of the second tube and the outer surface of the first tube defining a chamber, the plurality of primary outlets providing fluid communication between the channel and the chamber, and the sidewall of the second tube having a first set of radially offset secondary outlets axially from the primary outlets along a first direction and a second set of radially offset secondary outlets axially from the primary outlets along a second direction opposite to the first direction. The plurality of radially extending outlet holes include a first set of radially ground-facing secondary outlets and a second set of radially ground-facing secondary outlets.

2. The fire extinguishing system according to claim 1, characterized in that, The nozzle is configured such that the inert gas exiting the plurality of outlet orifices is balanced.

3. The fire extinguishing system according to claim 2, characterized in that, The ratio between the maximum set flow value and the minimum set flow value among the plurality of outlet holes is less than 60:

40.

4. The fire extinguishing system according to any one of claims 1 to 3, characterized in that, The sound power level from the nozzle, in accordance with UL 2127, second edition, shall not exceed 108.6 dB for a coverage area of ​​up to 36 ft × 36 ft for a frequency range of 500 Hz to 10000 Hz.

5. The fire extinguishing system according to any one of claims 1 to 3, characterized in that, The sound power level from the nozzle, in accordance with UL 2127, second edition, shall not exceed 120 dB for a coverage area of ​​up to 36 ft × 36 ft for a frequency range of 500 Hz to 10000 Hz.

6. The fire extinguishing system according to any one of claims 1 to 3, characterized in that, The nozzle has a protection height of up to 20 ft in accordance with UL 2127, second edition.

7. The fire extinguishing system according to any one of claims 1 to 3, characterized in that, During the discharge, the pressure drop from the nozzle inlet to the plurality of outlet orifices is up to 80 psi higher than the gauge pressure of the housing.

8. The fire extinguishing system according to any one of claims 1 to 3, characterized in that, The first group of radially oriented secondary outlets and the second group of radially oriented secondary outlets have a second combined flow area that is larger than the first combined flow area. The nozzle also includes: An inner annular disk located between the first annular disk and the second annular disk surrounds the second tube between the first set of radially oriented secondary outlets and the second set of radially oriented secondary outlets and has sound-absorbing material facing the first set of radially oriented secondary outlets and the second set of radially oriented secondary outlets. The first annular disk is disposed on the side of the first group of radially facing secondary outlets, opposite to the inner annular disk. The first annular disk has sound-absorbing material disposed on the side facing the first group of radially facing secondary outlets; and The second annular disk is disposed on the side of the second group of radially ground-facing secondary outlets opposite to the inner annular disk, and the second annular disk has sound-absorbing material disposed on the side facing the second group of radially ground-facing secondary outlets.

9. The fire extinguishing system according to claim 8, characterized in that, The nozzle further includes: Sound-absorbing devices installed in the room.

10. The fire extinguishing system according to claim 9, characterized in that, The sound-absorbing device includes a baffle and at least one sound-absorbing insert, the baffle comprising a porous sound-absorbing material.

11. The fire extinguishing system according to claim 9, characterized in that, The sound-absorbing device includes at least one ring comprising non-porous sound-absorbing material disposed between the first set of primary outlets and the second set of primary outlets, and at least one sound-absorbing insert.

12. The fire extinguishing system according to claim 8, further comprising: An orifice plate is used to supply flow to the first pipe.

13. The fire extinguishing system according to any one of claims 1-3, characterized in that, The acoustic power level of the nozzle is no greater than 130 dB for inert gas flow rates in the range of 950 CFM to 5400 CFM.

14. The fire extinguishing system according to claim 13, characterized in that, The sound power level is no greater than 120 dB.

15. The fire extinguishing system according to claim 13, characterized in that, The sound power level is no greater than 111 dB.

16. The fire extinguishing system according to any one of claims 1-3, characterized in that, The acoustic power level of the nozzle is in the range of 111 dB to 130 dB for inert gas flow rates in the range of 950 CFM to 5400 CFM.

17. A fire extinguishing nozzle assembly, comprising: A nozzle to be disposed within a housing, the nozzle having a plurality of radially extending outlet orifices, and A first annular disk is disposed above the plurality of outlet holes and a second annular disk is disposed below the plurality of outlet holes, wherein both the first annular disk and the second annular disk include sound-absorbing inserts, and the sound-absorbing inserts of the first annular disk and the second annular disk are configured to reduce the sound power level of the inert gas when the inert gas flows out of the plurality of outlet holes to the outside of the nozzle and passes through the gap between the first annular disk and the second annular disk. The characteristic feature is that, during the discharge of the inert gas into the housing, the sound power level from the nozzle is no greater than 125 dB for the frequency range of 500 Hz to 10000 Hz; The nozzle further includes: A first tube having an inner surface and an outer surface, the inner surface of the first tube defining an axially extending channel, the channel including an inlet at an axial end of the channel and a plurality of primary outlets disposed through a sidewall of the first tube, the primary outlets having a first combined flow area, the inlet being connected to an inert gas source via a distribution conduit; A second tube surrounds the first tube, the inner surface of the second tube and the outer surface of the first tube defining a chamber, the plurality of primary outlets providing fluid communication between the channel and the chamber, and the sidewall of the second tube having a first set of radially offset secondary outlets axially from the primary outlets along a first direction and a second set of radially offset secondary outlets axially from the primary outlets along a second direction opposite to the first direction. The plurality of radially extending outlet holes include a first set of radially ground-facing secondary outlets and a second set of radially ground-facing secondary outlets.

18. The fire extinguishing nozzle assembly according to claim 17, characterized in that, The nozzle is configured such that the inert gas exiting the plurality of outlet orifices is balanced.

19. The fire extinguishing nozzle assembly according to claim 18, characterized in that, The ratio between the maximum set flow value and the minimum set flow value among the plurality of outlet holes is less than 60:

40.

20. The fire extinguishing nozzle assembly according to any one of claims 17-19, characterized in that, The sound power level from the nozzle, in accordance with UL 2127, second edition, shall not exceed 108.6 dB for a coverage area of ​​up to 36 ft × 36 ft for a frequency range of 500 Hz to 10000 Hz.

21. The fire extinguishing nozzle assembly according to any one of claims 17-19, characterized in that, The sound power level from the nozzle, in accordance with UL 2127, second edition, shall not exceed 120 dB for a coverage area of ​​up to 36 ft × 36 ft for a frequency range of 500 Hz to 10000 Hz.

22. The fire extinguishing nozzle assembly according to any one of claims 17 to 19, characterized in that, The nozzle has a protection height of up to 20 ft in accordance with UL 2127, second edition.

23. The fire extinguishing nozzle assembly according to any one of claims 17 to 19, characterized in that, During the discharge, the pressure drop from the nozzle inlet to the plurality of outlet orifices is up to 80 psi higher than the gauge pressure of the housing.

24. The fire extinguishing nozzle assembly according to any one of claims 17 to 19, characterized in that, The first group of radially oriented secondary outlets and the second group of radially oriented secondary outlets have a second combined flow area that is larger than the first combined flow area. The nozzle further includes an inner annular disk located between the first annular disk and the second annular disk, which surrounds the second tube between the first set of radially oriented secondary outlets and the second set of radially oriented secondary outlets and has sound-absorbing material facing the first set of radially oriented secondary outlets and the second set of radially oriented secondary outlets. The first annular disk is disposed on the side of the first group of radially ground-facing secondary outlets opposite to the inner annular disk, and the first annular disk has sound-absorbing material disposed on the side facing the first group of radially ground-facing secondary outlets; as well as The second annular disk is disposed on the side of the second group of radially ground-facing secondary outlets opposite to the inner annular disk, and the second annular disk has sound-absorbing material disposed on the side facing the second group of radially ground-facing secondary outlets.

25. The fire extinguishing nozzle assembly according to claim 24, characterized in that, The nozzle further includes: Sound-absorbing devices installed in the room.

26. The fire extinguishing nozzle assembly according to claim 25, characterized in that, The sound-absorbing device includes a baffle and at least one sound-absorbing insert, the baffle comprising a porous sound-absorbing material.

27. The fire extinguishing nozzle assembly according to claim 25, characterized in that, The sound-absorbing device includes at least one ring comprising non-porous sound-absorbing material disposed between the first set of primary outlets and the second set of primary outlets, and at least one sound-absorbing insert.

28. The fire extinguishing nozzle assembly according to claim 24, further comprising: An orifice plate is used to supply flow to the first pipe.

29. The fire extinguishing nozzle assembly according to any one of claims 17-19, characterized in that, The acoustic power level of the nozzle is no greater than 130 dB for inert gas flow rates in the range of 950 CFM to 5400 CFM and for frequency ranges of 500 Hz to 10000 Hz.

30. The fire extinguishing nozzle assembly according to claim 29, characterized in that, The sound power level is no greater than 120 dB.

31. The fire extinguishing nozzle assembly according to claim 29, characterized in that, The sound power level is no greater than 111 dB.

32. The fire extinguishing nozzle assembly according to any one of claims 17-19, characterized in that, The acoustic power level of the nozzle is in the range of 111 dB to 130 dB for inert gas flow rates in the range of 950 CFM to 5400 CFM for the frequency range of 500 Hz to 10000 Hz.

33. A fire extinguishing system, comprising: shell; An inert gas source is provided to supply inert gas to the housing via a distribution pipe; A nozzle disposed in the housing has a plurality of radially extending outlet orifices; A first annular disk is disposed above the plurality of outlet holes; And a second annular disk disposed below the plurality of outlet holes, wherein both the first annular disk and the second annular disk include sound-absorbing inserts, the sound-absorbing inserts of the first annular disk and the second annular disk being configured to reduce the sound power level of the inert gas as it passes through the gap between the first annular disk and the second annular disk after the inert gas flows out of the plurality of outlet holes to the outside of the nozzle. The characteristic feature is that, during the discharge of the inert gas, the sound power level from the nozzle is not greater than 130 dB for a frequency range of 500 Hz to 10000 Hz; The nozzle further includes: A first tube having an inner surface and an outer surface, the inner surface of the first tube defining an axially extending channel, the channel including an inlet at an axial end of the channel and a plurality of primary outlets disposed through a sidewall of the first tube, the primary outlets having a first combined flow area, the inlet being connected to the distribution conduit; A second tube surrounds the first tube, the inner surface of the second tube and the outer surface of the first tube defining a chamber, the plurality of primary outlets providing fluid communication between the channel and the chamber, and the sidewall of the second tube having a first set of radially offset secondary outlets axially from the primary outlets along a first direction and a second set of radially offset secondary outlets axially from the primary outlets along a second direction opposite to the first direction. The plurality of radially extending outlet holes include a first set of radially ground-facing secondary outlets and a second set of radially ground-facing secondary outlets.

34. The fire extinguishing system according to claim 33, characterized in that, The nozzle is configured such that the inert gas exiting the plurality of outlet orifices is balanced.

35. The fire extinguishing system according to claim 34, characterized in that, The ratio between the maximum set flow value and the minimum set flow value among the plurality of outlet holes is less than 60:

40.

36. The fire extinguishing system according to claim 33, characterized in that, The sound power level from the nozzle is no greater than 108.6 dB.

37. The fire extinguishing system according to claim 33, characterized in that, The sound power level from the nozzle is no greater than 125 dB.

38. The fire extinguishing system according to any one of claims 33 to 37, characterized in that, The nozzle has a protection height of up to 20 ft in accordance with UL 2127, second edition.

39. The fire extinguishing system according to any one of claims 33 to 37, characterized in that, During the discharge, the pressure drop from the nozzle inlet to the plurality of outlet orifices is up to 80 psi higher than the gauge pressure of the housing.

40. The fire extinguishing system according to any one of claims 33 to 37, characterized in that, The first group of radially oriented secondary outlets and the second group of radially oriented secondary outlets have a second combined flow area that is larger than the first combined flow area. The nozzle further includes an inner annular disk located between the first annular disk and the second annular disk, which surrounds the second tube between the first set of radially oriented secondary outlets and the second set of radially oriented secondary outlets and has sound-absorbing material facing the first set of radially oriented secondary outlets and the second set of radially oriented secondary outlets. The first annular disk is disposed on the side of the first group of radially ground-facing secondary outlets opposite to the inner annular disk, and the first annular disk has sound-absorbing material disposed on the side facing the first group of radially ground-facing secondary outlets; as well as The second annular disk is disposed on the side of the second group of radially ground-facing secondary outlets opposite to the inner annular disk, and the second annular disk has sound-absorbing material disposed on the side facing the second group of radially ground-facing secondary outlets.

41. The fire extinguishing system according to claim 40, characterized in that, The nozzle further includes: Sound-absorbing devices installed in the room.

42. The fire extinguishing system according to claim 41, characterized in that, The sound-absorbing device includes a baffle and at least one sound-absorbing insert, the baffle comprising a porous sound-absorbing material.

43. The fire extinguishing system according to claim 41, characterized in that, The sound-absorbing device includes at least one ring comprising non-porous sound-absorbing material disposed between the first set of primary outlets and the second set of primary outlets, and at least one sound-absorbing insert.

44. The fire extinguishing system according to claim 40, further comprising: An orifice plate is used to supply flow to the first pipe.

45. The fire extinguishing system according to any one of claims 33-37, characterized in that, The acoustic power level of the nozzle is no greater than 130 dB for inert gas flow rates in the range of 950 CFM to 5400 CFM.

46. ​​The fire extinguishing system according to claim 45, characterized in that, The sound power level is no greater than 120 dB.

47. The fire extinguishing system according to claim 45, characterized in that, The sound power level is no greater than 111 dB.

48. The fire extinguishing system according to any one of claims 33-37, characterized in that, The acoustic power level of the nozzle is in the range of 111 dB to 130 dB for inert gas flow rates in the range of 950 CFM to 5400 CFM.

49. A fire extinguishing nozzle assembly, comprising: A nozzle to be disposed in a housing, the nozzle having: a plurality of radially extending outlet orifices; A first annular disk is disposed above the plurality of outlet holes; And a second annular disk disposed below the plurality of outlet holes, wherein both the first annular disk and the second annular disk include sound-absorbing inserts, the sound-absorbing inserts of the first annular disk and the second annular disk being configured to reduce the sound power level of the inert gas as it passes through the gap between the first annular disk and the second annular disk after the inert gas flows out of the plurality of outlet holes to the outside of the nozzle. The characteristic feature is that, during the discharge of the inert gas into the housing, the sound power level from the nozzle is no greater than 130 dB for the frequency range of 500 Hz to 10000 Hz; The nozzle further includes: A first tube having an inner surface and an outer surface, the inner surface of the first tube defining an axially extending channel, the channel including an inlet at an axial end of the channel and a plurality of primary outlets disposed through a sidewall of the first tube, the primary outlets having a first combined flow area, the inlet being connected to an inert gas source via a distribution conduit; A second tube surrounds the first tube, the inner surface of the second tube and the outer surface of the first tube defining a chamber, the plurality of primary outlets providing fluid communication between the channel and the chamber, and the sidewall of the second tube having a first set of radially offset secondary outlets axially from the primary outlets along a first direction and a second set of radially offset secondary outlets axially from the primary outlets along a second direction opposite to the first direction. The plurality of radially extending outlet holes include a first set of radially ground-facing secondary outlets and a second set of radially ground-facing secondary outlets.

50. The fire extinguishing nozzle assembly according to claim 49, characterized in that, The nozzle is configured such that the inert gas exiting the plurality of outlet orifices is balanced.

51. The fire extinguishing nozzle assembly according to claim 50, characterized in that, The ratio between the maximum set flow value and the minimum set flow value among the plurality of outlet holes is less than 60:

40.

52. The fire extinguishing nozzle assembly according to claim 49, characterized in that, The sound power level from the nozzle is no greater than 108.6 dB.

53. The fire extinguishing nozzle assembly according to claim 49, characterized in that, The sound power level from the nozzle is no greater than 125 dB.

54. The fire extinguishing nozzle assembly according to any one of claims 49 to 53, characterized in that, The nozzle has a protection height of up to 20 ft in accordance with UL 2127, second edition.

55. The fire extinguishing nozzle assembly according to any one of claims 49 to 53, characterized in that, During the discharge, the pressure drop from the nozzle inlet to the plurality of outlet orifices is up to 80 psi higher than the gauge pressure of the housing.

56. The fire extinguishing nozzle assembly according to any one of claims 49 to 53, characterized in that, The first group of radially oriented secondary outlets and the second group of radially oriented secondary outlets have a second combined flow area that is larger than the first combined flow area. The nozzle further includes an inner annular disk located between the first annular disk and the second annular disk, which surrounds the second tube between the first set of radially oriented secondary outlets and the second set of radially oriented secondary outlets and has sound-absorbing material facing the first set of radially oriented secondary outlets and the second set of radially oriented secondary outlets. The first annular disk is disposed on the side of the first group of radially facing secondary outlets, opposite to the inner annular disk. The first annular disk has sound-absorbing material disposed on the side facing the first group of radially facing secondary outlets; and The second annular disk is disposed on the side of the second group of radially ground-facing secondary outlets opposite to the inner annular disk, and the second annular disk has sound-absorbing material disposed on the side facing the second group of radially ground-facing secondary outlets.

57. The fire extinguishing nozzle assembly according to claim 56, characterized in that, The nozzle further includes a sound-absorbing device disposed in the chamber.

58. The fire extinguishing nozzle assembly according to claim 57, characterized in that, The sound-absorbing device includes a baffle and at least one sound-absorbing insert, the baffle comprising a porous sound-absorbing material.

59. The fire extinguishing nozzle assembly according to claim 57, characterized in that, The sound-absorbing device includes at least one ring comprising non-porous sound-absorbing material disposed between the first set of primary outlets and the second set of primary outlets, and at least one sound-absorbing insert.

60. The fire extinguishing nozzle assembly according to claim 56, further comprising: An orifice plate is used to supply flow to the first pipe.

61. The fire extinguishing nozzle assembly according to any one of claims 49-53, characterized in that, The acoustic power level of the nozzle is no greater than 130 dB for inert gas flow rates in the range of 950 CFM to 5400 CFM and for frequency ranges of 500 Hz to 10000 Hz.

62. The fire extinguishing nozzle assembly according to claim 61, characterized in that, The sound power level is no greater than 120 dB.

63. The fire extinguishing nozzle assembly according to claim 61, characterized in that, The sound power level is no greater than 111 dB.

64. The fire extinguishing nozzle assembly according to any one of claims 49-53, characterized in that, The acoustic power level of the nozzle is in the range of 111 dB to 130 dB for inert gas flow rates in the range of 950 CFM to 5400 CFM for the frequency range of 500 Hz to 10000 Hz.

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