Passive temperature control three-way valve for low-pressure carbon dioxide fire extinguishing system

Abstract

According to the passive temperature control three-way valve for the low-pressure carbon dioxide fire extinguishing system, the environment temperature is directly detected through the memory alloy spring, work does not need to depend on a power supply, and therefore the automatic starting control reliability of the low-pressure carbon dioxide fire extinguishing system is greatly improved; according to the passive temperature control three-way valve, the valve element is driven to move through magnetic coupling drive, meanwhile, a thermal insulation measure is adopted between the memory alloy spring and a connecting structure of the passive temperature control three-way valve, and the influence of low temperature on work of the memory alloy spring is avoided, so that the passive temperature control three-way valve is not influenced by a low-temperature medium when opened; the passive temperature control three-way valve can work reliably when a low-temperature medium flows through, release of carbon dioxide is guaranteed, and a fire is fully extinguished.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of control valve for nonferrous metal rolling low pressure carbon dioxide fire extinguishing system, and specifically relates to a passive temperature control tee valve for low pressure carbon dioxide fire extinguishing system. BACKGROUND

[0002] The automatic starting control of the existing low pressure carbon dioxide fire extinguishing system is realized through an electric tee valve, and the opening of the electric tee valve is controlled by a smoke sensor and a temperature sensor installed on the scene of the fire extinguishing area; the temperature information of the fire extinguishing scene detected by the smoke sensor and the temperature sensor is transmitted to an electric control system, and finally a signal is sent by the electric control system to control the action of the electric tee valve. Therefore, the communication chain of the automatic starting control of the existing low pressure carbon dioxide fire extinguishing system is relatively long, and it depends on the normal operation of the power supply. If the power supply is cut off or the control communication chain is interrupted when a fire occurs, the automatic control will fail. Therefore, the automatic starting control of the existing low pressure carbon dioxide fire extinguishing system has low reliability, and needs to be further improved.

[0003] A bidirectional connection double-valve core shut-off memory alloy spring temperature control valve is disclosed in Chinese patent application No. 202210229279.0. The principle of this valve is to directly control the opening and closing of the valve through a memory alloy spring to detect the external temperature, without relying on an external power supply and without needing a control communication chain, thus having extremely high working reliability. However, if the above-mentioned bidirectional connection double-valve core shut-off memory alloy spring temperature control valve is directly applied to a low pressure carbon dioxide fire extinguishing system, the following problems still exist: 1. The bidirectional connection double-valve core shut-off memory alloy spring temperature control valve is only an on-off valve, while a tee valve must be used in the low pressure carbon dioxide fire extinguishing system due to the design requirements of the control gas path, so the bidirectional connection double-valve core shut-off memory alloy spring temperature control valve cannot be directly applied to the low pressure carbon dioxide fire extinguishing system; 2. During the operation of the low pressure carbon dioxide fire extinguishing system, a -18℃--20℃ carbon dioxide gas-liquid mixture needs to flow through the tee valve, which will cause the temperature of the memory alloy spring to drop, resulting in a change in the working state of the tee valve, and causing the release time of carbon dioxide to be too short during the operation of the low pressure carbon dioxide fire extinguishing system, which cannot ensure that the fire can be fully extinguished. Due to the above-mentioned problems, the bidirectional connection double-valve core shut-off memory alloy spring temperature control valve must be improved when it is applied to the low pressure carbon dioxide fire extinguishing system. UTILITY MODEL CONTENTS

[0004] In order to overcome the deficiencies in the background art, the utility model discloses a passive temperature control tee valve for low pressure carbon dioxide fire extinguishing system to solve the problem that the existing bidirectional connection double-valve core shut-off memory alloy spring temperature control valve cannot be directly applied to the low pressure carbon dioxide fire extinguishing system.

[0005] In order to achieve the purpose of the utility model, the utility model adopts the following technical scheme: a passive temperature control three-way valve for a low-pressure carbon dioxide fire extinguishing system, which comprises a three-way valve, a valve core control assembly, a valve cover 3, the valve core control assembly is fixedly arranged at one side end of the three-way valve through the valve cover 3, the valve core control assembly is provided with a memory alloy spring, the three-way valve is movably provided with a valve core, the valve core and the valve core control assembly are provided with permanent magnets, and the valve core and the valve core control assembly are coupled by magnetic force, when the memory alloy spring is deformed due to the influence of external environmental temperature, the memory alloy spring drives the permanent magnet B3 to drive the permanent magnet A3 to move, the permanent magnet A3 drives the valve core to slide in the three-way valve, and the opening and closing control of the passive temperature control three-way valve is realized.

[0006] Further, the valve cover 3 and the valve body of the three-way valve are provided with a heat insulation pad

[0007] Further, the valve core end is fixedly provided with a magnet seat, and the upper portion of the magnet seat is fixedly provided with the permanent magnet A3.

[0008] Further, the valve core control assembly further comprises a valve rod, a valve rod isolation sleeve, a permanent magnet B3, a valve rod sleeve, a spring fixing plate, a valve rod top plate, a heat insulation ring, a heat insulation sleeve and a valve cover, the valve rod isolation sleeve comprises a flange plate at the upper portion and a thin-wall isolation sleeve at the lower portion, and the flange plate and the thin-wall isolation sleeve are fixedly connected, the valve rod sleeve is fixedly arranged in the middle of the flange plate, the valve rod lower end is arranged in the cavity of the thin-wall isolation sleeve through the valve rod sleeve, and the permanent magnet B3 is fixedly arranged at the valve rod lower end, the valve rod top plate is fixedly arranged at the valve rod upper end, the upper end of the memory alloy spring is fixedly connected with the valve rod top plate through the spring fixing plate, and the lower end is fixedly connected with the flange plate of the valve rod isolation sleeve through the spring fixing plate.

[0009] Further, the outer surface of the lower portion of the valve rod isolation sleeve is coated with heat insulation paint.

[0010] Further, the heat insulation ring is arranged between the spring fixing plate and the flange plate of the valve rod isolation sleeve and between the spring fixing plate and the valve rod top plate.

[0011] Further, the heat insulation sleeve is arranged between the valve rod and the valve rod sleeve.

[0012] With the technical scheme as above, the low-pressure carbon dioxide fire extinguishing system passive temperature control three-way valve has the following beneficial effects: the low-pressure carbon dioxide fire extinguishing system passive temperature control three-way valve directly detects the ambient temperature through the memory alloy spring, and does not need to rely on power supply to work, thus greatly improving the automatic starting control reliability of the low-pressure carbon dioxide fire extinguishing system; the low-pressure carbon dioxide fire extinguishing system passive temperature control three-way valve drives the valve core to move through magnetic coupling, and the temperature insulation measures are also taken between the memory alloy spring and the connection structure of the low-pressure carbon dioxide fire extinguishing system passive temperature control three-way valve, thus solving the influence of low temperature on the working of the memory alloy spring, so that the low-pressure carbon dioxide fire extinguishing system passive temperature control three-way valve is not affected by the low-temperature medium when it is opened, and can work reliably when the low-temperature medium flows through, thus ensuring the release of carbon dioxide and ensuring that the fire is fully extinguished. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structure schematic view of the passive temperature control three-way valve;

[0014] Figure 2 It is a structure schematic view of the valve core assembly;

[0015] Figure 3 It is a structure schematic view of the valve core control assembly;

[0016] Figure 4 It is an appearance schematic view of the spring fixing plate.

[0017] In the figure: 1, three-way valve; 1.1, valve core; 1.2, magnet seat; 1.3, permanent magnet A; 2, valve core control assembly; 2.1, valve rod; 2.2, valve rod isolation sleeve; 2.3, permanent magnet B; 2.4, valve rod sleeve; 2.5, spring fixing plate; 2.6, memory alloy spring; 2.7, valve rod top plate; 2.8, heat insulation ring; 2.9, heat insulation sleeve; 3, valve cover; 4, heat insulation pad. DETAILED DESCRIPTION

[0018] The utility model can be explained in detail through the following examples, and the purpose of the utility model is to protect all technical improvements within the scope of the utility model.

[0019] Referring to the drawings attached to the specification Figure 1 A low-pressure carbon dioxide fire extinguishing system passive temperature control three-way valve, comprising a three-way valve 1, a valve core control assembly 2, a valve cover 3, and a heat insulation pad 4.

[0020] Referring to the drawings attached to the specification Figure 2 A valve core 1.1 is slidably arranged in the three-way valve 1, a basin-shaped magnet seat 1.2 is fixedly arranged on the upper end of the valve core 1.1, and a ring-shaped permanent magnet A 1.3 is adhesively and fixedly arranged on the upper part of the magnet seat 1.2.

[0021] The valve core control assembly 2 includes a valve stem 2.1, a valve stem isolation sleeve 2.2, a permanent magnet B2.3, a valve stem sleeve 2.4, a spring fixing plate 2.5, a memory alloy spring 2.6, a valve stem top plate 2.7; the permanent magnet B2.3 is annular and fixedly arranged at the lower end of the valve stem 2.1; the valve stem isolation sleeve 2.2 includes an upper flange plate and a lower thin-walled isolation sleeve (stamped part), which are connected by welding, and the outer surface of the thin-walled isolation sleeve is coated with heat insulation paint; the valve stem sleeve 2.4 is fixedly arranged in the middle of the upper flange plate of the valve stem isolation sleeve 2.2; the permanent magnet B2.3 is movably arranged in the cavity of the thin-walled isolation sleeve, the valve stem 2.1 extends to the upper part through the valve stem sleeve 2.4, and a heat insulation sleeve 2.9 is arranged between the valve stem 2.1 and the valve stem sleeve 2.4; the memory alloy spring 2.6 is provided with spring fixing heads at both ends; one side end surface of the spring fixing plate 2.5 is provided with a spring clamping groove 2.5.1, the spring fixing plate 2.5 is fixedly arranged on the upper end surface of the upper flange plate of the valve stem isolation sleeve 2.2 in a downward manner through the spring clamping groove 2.5.1 by means of bolts, and a heat insulation ring 2.8 is arranged between the spring fixing plate 2.5 and the upper end surface of the flange plate; the memory alloy spring 2.6 is sleeved on the outer circular surface of the upper part of the valve stem 2.1, the spring fixing head at the lower end of the memory alloy spring 2.6 is arranged in the spring clamping groove 2.5.1 of the spring fixing plate 2.5, and the fixed connection between the spring fixing plate 2.5 and the memory alloy spring 2.6 is realized; the valve stem top plate 2.7 is fixedly arranged at the upper end of the valve stem 2.1 by means of a nut, the spring fixing plate 2.5 is fixedly arranged at the lower end of the valve stem top plate 2.7 by means of bolts, a heat insulation ring 2.8 is arranged between the spring fixing plate 2.5 and the valve stem top plate 2.7, a spring clamping groove 2.5.1 is arranged on the side end surface of the spring fixing plate 2.5 facing the valve stem top plate 2.7, and the spring fixing head at the upper end of the memory alloy spring 2.6 is arranged in the spring clamping groove 2.5.1 of the spring fixing plate 2.5, so that the fixed connection between the spring fixing plate 2.5 and the memory alloy spring 2.6 is realized;

[0022] The valve core control assembly 2 is fixedly arranged at the upper end of the three-way valve 1 through the valve cover 3, and the heat insulation pad 4 is arranged between the valve cover 3 and the valve body of the three-way valve 1; the thin-walled isolation sleeve at the lower part of the valve stem isolation sleeve 2.2 is inserted into the cavity of the magnet seat 3.5, and the permanent magnet B2.3 in the valve core control assembly 2 is coupled and driven with the permanent magnet A1.3 on the valve core 1.1 through magnetic force; the structure for transmitting power through magnetic force couples the valve stem 2.1, the permanent magnet B2.3 in the valve core control assembly 2 and the valve core 1.1, and they are isolated in the closed cavity of the valve stem isolation sleeve 2.2, so that heat conduction between them is prevented;

[0023] When the passive temperature control three-way valve is in the off state, the memory alloy spring 2.6 is provided with a pre-tension, which makes the permanent magnet B2.3 at the bottom of the thin-walled isolation sleeve through the valve stem 2.1, and the permanent magnet B2.3 drives the valve core 1.1 to be in the original off state through the magnetic force coupling with the permanent magnet A1.3;

[0024] The passive temperature control three-way valve is used in parallel with the existing low-pressure carbon dioxide fire extinguishing system electric three-way valve, and is arranged on the upper part of the fire extinguishing control area through the gas pipeline.

[0025] During the operation of the passive temperature control three-way valve, the valve rod 2.1 and the permanent magnet B2.3 are not directly contacted with the low-temperature carbon dioxide gas-liquid mixture due to the isolation of the thin-wall isolation sleeve, and the low temperature of the valve core 1.1 and the valve body is not rapidly transmitted to the memory alloy spring 2.6 due to the effects of the heat insulation coating, the heat insulation ring 2.8 and the heat insulation pad 4, so that the opening time of the passive temperature control three-way valve is ensured and the fire can be fully extinguished.

[0026] The parts not described in detail in the utility model are prior art.

[0027] It should be understood by those skilled in the art that the skilled in the art can realize the variation examples in combination with the prior art and the above-mentioned embodiments, and such variation examples do not affect the essential content of the scheme, and are not described here.

[0028] It should be understood that the scheme is not limited to the above specific embodiments, and the devices and structures not fully described should be understood as being implemented in the ordinary way in the art; any person skilled in the art can make many possible changes and modifications to the technical scheme of the scheme by using the disclosed methods and technical contents without departing from the scope of the technical scheme of the scheme, or modify equivalent embodiments of equivalent changes, which does not affect the essential content of the scheme. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the scheme, which does not deviate from the content of the technical scheme of the scheme, still belongs to the protection scope of the technical scheme of the scheme.

Claims

1. A passive temperature control three-way valve for low-pressure carbon dioxide fire extinguishing system, comprising a three-way valve (1), a valve core control assembly (2), and a valve cover (3); the valve core control assembly (2) is fixedly arranged at one side end of the three-way valve (1) through the valve cover (3); characterized in that: The valve core control assembly (2) is provided with a memory alloy spring (2.6); the three-way valve (1) is movably provided with a valve core (1.1); the valve core (1.1) and the valve core control assembly (2) are both provided with permanent magnets, and the valve core (1.1) and the valve core control assembly (2) are coupled and connected through magnetic force; when the memory alloy spring (2.6) is deformed due to the influence of external environment temperature, the memory alloy spring (2.6) drives the permanent magnet B (2.3) to drive the permanent magnet A (1.3) to move, the permanent magnet A (1.3) drives the valve core (1.1) to slide in the three-way valve (1), and the opening and closing control of the passive temperature control three-way valve is realized. The valve core control assembly (2) further comprises a valve rod (2.1), a valve rod isolation sleeve (2.2), a permanent magnet B (2.3), a valve rod sleeve (2.4), a spring fixing plate (2.5), a valve rod top plate (2.7), a heat insulation ring (2.8), a heat insulation sleeve (2.9), and a valve cover (2.10); the valve rod isolation sleeve (2.2) comprises a flange plate at the upper part and a thin-walled isolation sleeve at the lower part, and the flange plate and the thin-walled isolation sleeve are fixedly connected; the valve rod sleeve (2.4) is fixedly arranged in the middle of the flange plate. The lower end of the valve rod (2.1) passes through the valve rod sleeve (2.4) and is arranged in the cavity of the thin-walled isolation sleeve, and the permanent magnet B (2.3) is fixedly arranged at the lower end of the valve rod (2.1); the valve rod top plate (2.7) is fixedly arranged at the upper end of the valve rod (2.1); the upper end of the memory alloy spring (2.6) is fixedly connected with the valve rod top plate (2.7) through the spring fixing plate (2.5), and the lower end is fixedly connected with the flange plate of the valve rod isolation sleeve (2.2) through the spring fixing plate (2.5).

2. The passive temperature controlled three-way valve for low pressure carbon dioxide fire extinguishing system according to claim 1, characterized in that: The valve cover (3) and the valve body of the three-way valve (1) are provided with a heat insulation pad (4).

3. The passive temperature controlled three-way valve for low pressure carbon dioxide fire extinguishing system according to claim 1, characterized in that: The end of the valve core (1.1) is fixedly provided with a magnet seat (1.2), and the upper part of the magnet seat (1.2) is fixedly provided with a permanent magnet A (1.3).

4. The passive temperature controlled three-way valve for low pressure carbon dioxide fire extinguishing system according to claim 1, characterized in that: The outer surface of the lower part of the valve rod isolation sleeve (2.2) is coated with heat insulation paint.

5. The passive temperature controlled three-way valve for low pressure carbon dioxide fire extinguishing system according to claim 1, characterized in that: The heat insulation ring (2.8) is arranged between the spring fixing plate (2.5) and the flange plate of the valve rod isolation sleeve (2.2) and between the spring fixing plate (2.5) and the valve rod top plate (2.7).

6. The passive temperature controlled three-way valve for low pressure carbon dioxide fire extinguishing system according to claim 1, characterized in that: The heat insulation sleeve (2.9) is arranged between the valve rod (2.1) and the valve rod sleeve (2.4).

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