Negative pressure end detection device of breather valve

Abstract

The utility model relates to the technical field of breather valves, in particular to a negative pressure end detection device of a breather valve. According to the scheme, the detection assembly can detect negative pressure changes in the storage tank, the fire retardant assembly can conduct active adjustment according to feedback of the detection assembly, and proper pressure in the storage tank is kept. By adopting the push rod and the push ball, the negative pressure change in the storage tank can be sensitively detected, and the detection precision is improved. The flame-retardant piece adopts a parallel structure of the supporting frame, the flame-retardant disc and the protection plate, even if the flame-retardant disc is heated to deform, a good flame-retardant channel can be kept, the problem that a single flame-retardant disc is prone to being blocked is avoided, the flame-retardant disc is formed by compounding a straight steel belt and a corrugated steel belt, multiple flame-retardant channels are formed, flame spreading can be effectively prevented, and the flame-retardant effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of breathing valves, in particular to a negative pressure end detection device of a breathing valve. Background Art

[0002] Liquid or gas in a tank will cause changes in pressure under the influence of temperature changes, changes in inlet and outlet flow, or chemical reactions. These pressure changes may damage the tank structure or even cause explosions or leaks. The breather valve is a key device used to control pressure changes inside the tank. They are mainly used in liquid or gas tanks to prevent safety problems caused by excessive pressurization or decompression in the tank. Ordinary breather valves use a weighted valve disc. Media polymerization and freezing can cause the valve disc and valve seat to stick together, the breather valve to fail, and the tank is very likely to be pressurized or deflated. Utility Model Content

[0003] In view of the above-mentioned or existing problems in the prior art that ordinary breathing valves use weighted valve discs, medium polymerization and freezing may cause the valve disc and valve seat to stick together, the breathing valve to fail, and the storage tank is very easy to be pressurized or deflated, the present utility model is proposed.

[0004] Therefore, the purpose of the utility model is to provide a negative pressure end detection device for a breathing valve.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: the detection assembly includes a protective plate, a lifting rod, a lifting plate and a push rod, the lifting rod passes through the protective plate and is connected to the top of the lifting plate, and the push rod is located at the bottom of the lifting plate;

[0006] The fire-blocking assembly comprises a valve body, a pressure relief member and an adjusting member, wherein the lifting rod, the lifting plate and the pushing rod are located in the valve body, the top of the pressure relief member is connected to the adjusting member by bolts, and the bottom of the pressure relief member is located in the valve body.

[0007] As a preferred solution of the negative pressure end detection device of a breathing valve of the utility model, wherein: the detection component also includes a fire stopper, one end of the push rod passes through the fire stopper, and the other end of the push rod is connected to a push ball.

[0008] As a preferred solution of the negative pressure end detection device of the breathing valve of the utility model, wherein: the detection component also includes a valve seat 1, and the top of the valve seat 1 is embedded with the bottom of the lifting plate.

[0009] As a preferred solution of the negative pressure end detection device of a breathing valve of the utility model, the fire barrier comprises a support frame, a fire barrier disk and a protective plate, the fire barrier disk is coaxially located between the support frame and the protective plate, the fire barrier is fixed to the bottom of the valve seat by bolts, and one end of the push rod passes through the fire barrier and extends into the valve seat.

[0010] As a preferred solution of the negative pressure end detection device of a breathing valve of the utility model, the fire barrier comprises a support frame, a fire barrier disk and a protective plate, the fire barrier disk is coaxially located between the support frame and the protective plate, the fire barrier is fixed to the bottom of the valve seat by bolts, and one end of the push rod passes through the fire barrier and extends into the valve seat.

[0011] As a preferred solution of the negative pressure end detection device of a breathing valve of the utility model, the fire-blocking disk includes a straight steel strip and a corrugated steel strip, and is formed by a plurality of straight steel strips and corrugated steel strips being interlaced and laminated with each other, a fire-blocking channel is formed between the straight steel strips and the corrugated steel strips, and the thickness of the fire-blocking disk is 10 mm.

[0012] As a preferred solution of the negative pressure end detection device of a breathing valve of the utility model, wherein: the valve body includes a negative pressure end and a vacuum end, the detection component is connected to the negative pressure end, the adjustment component is installed on the top of the vacuum end, and the pressure relief component is installed inside the vacuum end.

[0013] As a preferred solution of the negative pressure end detection device of a breathing valve of the utility model, wherein: the pressure relief component includes valve seat 2, valve disc, valve stem and pressure relief chamber, the valve seat 2 is fixed to the vacuum end by bolts, the bottom of the valve disc is embedded in the top of the valve seat 2, the bottom of the valve stem is fixed to the top of the valve disc, and the space at the top of the valve disc is the pressure relief chamber.

[0014] As a preferred solution of the negative pressure end detection device of a breathing valve of the utility model, the adjusting member includes a valve cover, a guide sleeve and a spring, the guide sleeve is arranged on the top of the valve stem, the top of the guide sleeve is fixed to the bottom of the spring, and the guide sleeve passes through the middle of the valve cover.

[0015] As a preferred solution of the negative pressure end detection device of a breathing valve of the utility model, wherein: the adjusting member also includes an adjusting screw and a valve sleeve, the bottom of the adjusting screw is fixed to the top of the spring, the bottom of the valve sleeve is fixed to the top of the valve cover, the interior of the valve sleeve is hollow, and the adjusting screw, guide sleeve and spring are located in the valve sleeve.

[0016] As a preferred solution of the negative pressure end detection device of a breathing valve of the utility model, the adjusting member also includes a valve bonnet, the valve bonnet is threadedly connected to the top of the valve sleeve, and the top of the adjusting screw extends into the interior of the valve bonnet and is connected to the inner wall of the valve bonnet.

[0017] The beneficial effects of the negative pressure end detection device of a breathing valve of the utility model: the detection component provided by this scheme can detect the negative pressure change in the storage tank, and the fire-blocking component can be actively adjusted according to the feedback of the detection component to maintain the appropriate pressure in the storage tank. The push rod and push ball structure can sensitively detect the negative pressure change in the storage tank, thereby improving the detection accuracy. The fire-blocking component adopts a parallel structure of a support frame, a fire-blocking disk and a protective plate. Even if the fire-blocking disk is deformed by heat, it can maintain a good flame-retardant channel, avoiding the problem of easy clogging of a single fire-blocking disk. The fire-blocking disk is composed of a composite of straight steel strips and corrugated steel strips to form multiple flame-retardant channels, which can effectively prevent the spread of flames and improve the flame-retardant effect.

[0018] The pressure relief parts and regulating parts in the fire-blocking assembly can monitor and adjust the pressure in the tank in real time, ensuring that the tank is in a safe and stable working state, effectively avoiding the potential safety hazards caused by excessive pressurization or depressurization. While effectively monitoring and adjusting the pressure in the tank, it can also improve safety performance through an optimized fire-blocking structure, solving the key problems of the existing technology and having good practical value and market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0020] Figure 1 It is an overall cross-sectional schematic diagram of the utility model.

[0021] Figure 2 This is a partial schematic diagram of the breathing valve body.

[0022] Figure 3 It is the overall schematic diagram of the fire-blocking component.

[0023] Figure 4 This is a schematic diagram of the pressure relief end.

[0024] Figure 5 Schematic diagram of the vacuum end.

[0025] Figure 6 Schematic diagram of the pressure relief and vacuum end installation structure DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Example 1

[0029] Reference Figure 1-3 , which is the first embodiment of the utility model.

[0030] Specifically, the detection assembly 100 includes a protective plate 101, a lifting rod 102, a lifting plate 103 and a push rod 104, the lifting rod 102 passes through the protective plate 101 and is connected to the top of the lifting plate 103, and the push rod 104 is located at the bottom of the lifting plate 103;

[0031] The fire-blocking assembly 200 includes a valve body 201, a pressure relief member 202 and an adjusting member 203. The lifting rod 102, the lifting plate 103 and the pushing rod 104 are located in the valve body 201. The top of the pressure relief member 202 is connected to the adjusting member 203 by bolts, and the bottom of the pressure relief member 202 is located in the valve body 201.

[0032] Furthermore, the detection assembly 100 also includes a fire stopper 105 , one end of the push rod 104 passes through the fire stopper 105 , and the other end of the push rod 104 is connected to a push ball 104 a .

[0033] Furthermore, the detection assembly 100 also includes a valve seat 106 , and the top of the valve seat 106 is embedded with the bottom of the lifting plate 103 .

[0034] Furthermore, the fire barrier 105 includes a support frame 105a, a fire barrier disk 105b and a protective plate 105c. The fire barrier disk 105b is coaxially located between the support frame 105a and the protective plate 105c. The fire barrier 105 is fixed to the bottom of the valve seat 106 by bolts, and one end of the push rod 104 passes through the fire barrier 105 and extends into the valve seat 106.

[0035] Furthermore, the fire barrier 105 includes a support frame 105a, a fire barrier disk 105b and a protective plate 105c. The fire barrier disk 105b is coaxially located between the support frame 105a and the protective plate 105c. The fire barrier 105 is fixed to the bottom of the valve seat 106 by bolts, and one end of the push rod 104 passes through the fire barrier 105 and extends into the valve seat 106.

[0036] Furthermore, the fire-blocking plate 105b includes straight steel strips and corrugated steel strips, and is formed by interlacing and laminating a plurality of straight steel strips and corrugated steel strips, and a fire-blocking channel is formed between the straight steel strips and the corrugated steel strips. The thickness of the fire-blocking plate 105b is 10 mm.

[0037] Preferably, the fire-blocking disk 105b includes a straight steel strip and a corrugated steel strip, and is formed by interlacing and laminating a plurality of straight steel strips and corrugated steel strips to form a fire-blocking channel between the straight steel strips and the corrugated steel strips. In this scheme, a fire-blocking gap of 70 mm is adopted, and there is a left and right distinction. The fire-blocking channel formed by the fire-blocking disk 105b adopts a straight-through plus non-straight-through technique, which is more conducive to the increase in the turbulence of the flame when it passes through the gap, and more sufficient heat exchange with the vessel wall. The non-straight-through design also increases the heat exchange area per unit length, and is conducive to heat exchange. The fire-blocking disk adopts a thickness of 10 mm. The thinner the fire-blocking disk 105b is, the more convenient it is to clean later, and the characteristics of small pressure drop and good medium circulation can be achieved.

[0038] Furthermore, the valve body 201 includes a negative pressure end 201a and a vacuum end 201b, the detection component 100 is connected to the negative pressure end 201a, the adjustment member 203 is installed on the top of the vacuum end 201b, and the pressure relief member 202 is installed inside the vacuum end 201b.

[0039] Preferably, the negative pressure end 201a can be known to belong to the lateral end of the valve body 201 with reference to the attached drawings of this solution, and the vacuum end 201b belongs to the longitudinal end.

[0040] Preferably, the fire barrier 105 is fixed to the bottom of the negative pressure end 201a by bolts, the top of the push rod 104 enters the interior of the valve seat 106, a through hole is opened in the middle of the fire barrier 105 for the push rod 104 to move, the top of the valve seat 106 is embedded in the bottom of the lifting plate 103, the top of the lifting plate 103 is provided with a vertical rod, the vertical rod is embedded in the lifting rod 102, the top of the lifting rod 102 passes through the protective plate 101 and extends to the outside, and the protective plate 101 is fixed to the top of the negative pressure end 201a by bolts.

[0041] When the valve disc and valve seat are stuck together inside the valve body 201, the breathing valve fails, and the storage tank is easily pressurized or deflated, when the push rod 104 is pushed upward, the lifting plate 103 exerts too much pressure on the push rod 104 downward, which means that the pressure inside the valve body 201 is overloaded and needs to be relieved. If, when the push rod 104 is pushed upward, the lifting plate 103 does not exert too much pressure on the push rod 104 downward, which means that the pressure inside the valve body 201 is moderate, and pressure relief can be performed as needed.

[0042] Furthermore, the pressure relief component 202 includes a valve seat 202a, a valve flap 202b, a valve stem 202c and a pressure relief chamber 202d. The valve seat 202a is fixed to the vacuum end 201b by bolts, the bottom of the valve flap 202b is embedded in the top of the valve seat 202a, the bottom of the valve stem 202c is fixed to the top of the valve flap 202b, and the space at the top of the valve flap 202b is the pressure relief chamber 202d.

[0043] Furthermore, the regulating member 203 includes a valve cover 203a, a guide sleeve 203b and a spring 203c. The guide sleeve 203b is sleeved on the top of the valve stem 202c. The top of the guide sleeve 203b is fixed to the bottom of the spring 203c. The guide sleeve 203b passes through the middle of the valve cover 203a.

[0044] Furthermore, the adjusting member 203 also includes an adjusting screw 203d and a valve sleeve 203e. The bottom of the adjusting screw 203d is fixed to the top of the spring 203c. The bottom of the valve sleeve 203e is fixed to the top of the valve cover 203a. The interior of the valve sleeve 203e is hollow. The adjusting screw 203d, the guide sleeve 203b and the spring 203c are located in the valve sleeve 203e.

[0045] Furthermore, the regulating member 203 further comprises a valve cap 203f, the valve cap 203f is threadedly connected to the top of the valve sleeve 203e, and the top of the regulating screw 203d extends into the interior of the valve cap 203f and is connected to the inner wall of the valve cap 203f.

[0046] When in use, the fire barrier 105 is fixed to the bottom of the negative pressure end 201a by bolts, and the top of the push rod 104 enters the interior of the valve seat 106. A through hole is opened in the middle of the fire barrier 105 for the push rod 104 to move. The top of the valve seat 106 is embedded in the bottom of the lifting plate 103. There is a vertical rod on the top of the lifting plate 103, and the vertical rod is embedded in the lifting rod 102. The top of the lifting rod 102 extends to the outside through the protective plate 101, and the protective plate 101 is fixed to the top of the negative pressure end 201a by bolts.

[0047] The pressure relief component 203 is installed on the vacuum end 201b, the bottom of the valve seat 202a is fixed to the top of the vacuum end 201b by bolts, the bottom of the valve disc 202b is embedded with the valve seat 202a, the top of the valve disc 202b is fixed to the valve stem 202c, the top of the pressure relief chamber 202d is fixed to the valve cover 203a by bolts, a through groove is provided in the center of the valve cover 203a, the valve stem 202c is carried in the through groove to move up and down, the bottom of the guide sleeve 203b is fixed to the top of the valve stem 202c, the top of the guide sleeve 203b is fixed to the bottom of the spring 203c, the bottom of the valve sleeve 203e is fixed to the top of the valve cover 203a, the interior of the valve sleeve 203e is hollow, the adjusting screw 203d, the guide sleeve 203b and the spring 203c are located in the valve sleeve 203e, the top of the adjusting screw 203d extends into the interior of the valve bonnet 203f and is threadedly connected to the inner wall of the valve bonnet 203f.

[0048] Example 2

[0049] Reference Figure 2-6 , which is the second embodiment of the utility model.

[0050] Preferably, the detection component 100 in this scheme can be applied to any breathing valve to check whether the polymerization and freezing of the medium in the breathing valve causes the valve disc and the valve seat to stick together, thereby causing the breathing valve to fail or the storage tank to be easily pressurized or deflated. This scheme preferably adopts the method of installing the detection component 100 on a vacuum safety valve as a method of implementation.

[0051] The fire-blocking disc used in this scheme is a commonly used fire-blocking device for breathing valves. The fire-blocking disc is a safety device for preventing the spread of liquid flames and explosion caused by backfire. When installed, it is usually set alone on the pressure regulating path of the breathing valve. When the liquid or gas in the tank is ignited, it plays a fire-blocking role. However, due to its single-body setting, as the flame continues to burn, the bottom of the fire-blocking disc that comes into contact with the flame first is deformed by heat, causing deformation and blockage of the fire-blocking channel, which in turn causes the gas or liquid passing through to be unable to be fully dispersed, resulting in a poor flame retardant effect.

[0052] This solution uses a state-of-the-art pressure or vacuum safety valve with a right-angle design that can be used for higher set pressures. Usually the valve is installed in the breathing or breathing container of tanks, containers and process equipment to open the pressure, thus producing the best process equipment to prevent unacceptable overpressure or overpressure. All internal components are made of PTFE or other highly corrosion-resistant materials, making this model a perfect solution for corrosive, polymeric or sticky substances.

[0053] Preferably, the tightness is higher than normal standards, since the pressure of the tank is maintained at the set pressure. The valve seats made of high-quality stainless steel and the valve trays sealed individually, or with air cushion seals, as well as high-quality FEP diaphragms, ensure this feature. The valve trays are also equipped with PTFE seals to prevent them from sticking when using sticky substances and to allow the use of corrosive fluids. After releasing the overpressure, the valve repositions and provides a tight seal.

[0054] The valve prevents loss of discharge almost to the set pressure and prevents unacceptable product ingress. This spring loaded model allows for higher set pressures than the DZ / T. Once the set pressure is reached the device will begin to open, requiring only 10% overpressure.

[0055] Continued investment in R&D was reduced by developing a low-pressure valve with the same opening characteristics as the high-pressure safety valve. This "full lift" technology allows the valve to be set 10% below the tank's maximum allowable working pressure or vacuum (MAWP or MAWV) and still safely discharge the required mass flow.

[0056] The opening characteristics are the same for pressure and vacuum release. Due to highly developed manufacturing technology, the tank pressure is maintained at the set pressure with a tightness far superior to conventional standards, a feature guaranteed by the valve seat made of high-quality stainless steel and the individually overlapped valve tray and the robust housing design; upon release of overpressure or vacuum balance, the valve repositions and provides a tight seal. The optimized fluid dynamics design of the valve body and valve disc is the result of many years of research, resulting in stable operation of the valve disc, optimized performance and reduced product losses.

[0057] Special features and advantages.

[0058] The minimum pressure of this solution 10% technology increases to full lift, extreme sealing, resulting in the lowest possible product loss and reduced environmental pollution, based on 10% technology, compared with traditional 40% or 100% technology, the set pressure is close to the opening pressure for optimal pressure maintenance. High flow capacity can reduce costs by using smaller valves, can be used as a pressure safety valve or vacuum safety valve. Can be used in explosion-hazardous areas. Robust housing design (PN10) Spring loading at high set pressure.

[0059] If the breathing valve of this scheme adopts the extreme sealing from the minimum pressure of 10% technology to full lift, it will lead to the lowest possible product loss. Compared with the traditional 40% or 100%, the 10% technology can achieve the best pressure maintenance in the system when the set pressure is close to the opening pressure. The valve tray is guided in the shell and can also be used as a protection system for areas with potentially explosive atmospheres under severe weather conditions. The integrated flame suppression device saves space and reduces costs. The flame suppression device can prevent product blockage and stickiness caused by product vapor.

[0060] High flow capacity allows to reduce costs by using smaller valves, Seals exceed normal standards, Flame arrester for almost all chemical mixtures, Valve tray is guided inside the housing to protect against adverse weather conditions, No contact with the product when operating with closed valve tray, Reduced maintenance intervals, Alcohol durable combustion protection, To meet the highest demands of the industry and reduce leakage rates, our valve trays and, valve seats are manufactured from high-quality stainless steel and are hand-sealed using highly developed manufacturing processes. Valve trays with air cushion diaphragms are used for low set pressures. Valves with integrated flame arrester are approved for use with substances in explosion groups IIA and IIB3.

[0061] The breathing valve of this scheme can also adopt the following values, which can be adjusted by technicians in this field according to the corresponding situation: pressure: +60 mbar, +24 inches to +500 mbar (DN40 / 1% "to 150 / 6") to inch WC> +60 millimeter +200 inches W. C. +24 inches;

[0062] Up to +400mbar (DN200 / 8: DN250 / 10.C) to +160" W.C.

[0063] Vacuum: -14 mbar to -50 mbar, 6-5 in. W.C. to -20 in. C.

[0064] Vacuum: 5-3 mbar, up to -14 mbar, -1.4 in. W. C. up to -5.6 in. W. C.

[0065] By setting pressure up to +150mbar / +60" T. C. To reduce the set pressure, higher set pressures and lower set vacuums are available upon request. For lower set pressures or vacuums, refer to DV / ZT models.

[0066] When in use, the fire barrier 105 is fixed to the bottom of the negative pressure end 201a by bolts, and the top of the push rod 104 enters the interior of the valve seat 106. A through hole is opened in the middle of the fire barrier 105 for the push rod 104 to move. The top of the valve seat 106 is embedded in the bottom of the lifting plate 103. There is a vertical rod on the top of the lifting plate 103, and the vertical rod is embedded in the lifting rod 102. The top of the lifting rod 102 extends to the outside through the protective plate 101, and the protective plate 101 is fixed to the top of the negative pressure end 201a by bolts.

[0067] The pressure relief component 203 is installed on the vacuum end 201b, the bottom of the valve seat 202a is fixed to the top of the vacuum end 201b by bolts, the bottom of the valve disc 202b is embedded with the valve seat 202a, the top of the valve disc 202b is fixed to the valve stem 202c, the top of the pressure relief chamber 202d is fixed to the valve cover 203a by bolts, a through groove is provided in the center of the valve cover 203a, the valve stem 202c is carried in the through groove to move up and down, the bottom of the guide sleeve 203b is fixed to the top of the valve stem 202c, the top of the guide sleeve 203b is fixed to the bottom of the spring 203c, the bottom of the valve sleeve 203e is fixed to the top of the valve cover 203a, the interior of the valve sleeve 203e is hollow, the adjusting screw 203d, the guide sleeve 203b and the spring 203c are located in the valve sleeve 203e, the top of the adjusting screw 203d extends into the interior of the valve bonnet 203f and is threadedly connected to the inner wall of the valve bonnet 203f.

[0068] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A negative pressure end detection device for a breathing valve, characterized in that: include, The detection assembly (100) comprises a protective plate (101), a lifting rod (102), a lifting plate (103), and a pushing rod (104), wherein the lifting rod (102) passes through the protective plate (101) and is connected to the top of the lifting plate (103), and the pushing rod (104) is located at the bottom of the lifting plate (103); The fire-blocking assembly (200) comprises a valve body (201), a pressure relief member (202) and an adjusting member (203); the lifting rod (102), the lifting plate (103) and the pushing rod (104) are located in the valve body (201); the top of the pressure relief member (202) is connected to the adjusting member (203) by bolts; and the bottom of the pressure relief member (202) is located in the valve body (201).

2. The negative pressure end detection device of the breathing valve according to claim 1, characterized in that: The detection assembly (100) further comprises a fire stopper (105), one end of the push rod (104) passes through the fire stopper (105), and the other end of the push rod (104) is connected to a push ball (104a).

3. The negative pressure end detection device of the breathing valve according to claim 2, characterized in that: The detection assembly (100) further comprises a valve seat (106), the top of the valve seat (106) being embedded in the bottom of the lifting plate (103).

4. The negative pressure end detection device of the breathing valve according to claim 3, characterized in that: The fire-blocking member (105) comprises a support frame (105a), a fire-blocking disc (105b) and a protective plate (105c); the fire-blocking disc (105b) is coaxially located between the support frame (105a) and the protective plate (105c); the fire-blocking member (105) is fixed to the bottom of the valve seat (106) by bolts; one end of the push rod (104) passes through the fire-blocking member (105) and extends into the valve seat (106).

5. The negative pressure end detection device of the breathing valve according to claim 4, characterized in that: The fire-blocking disc (105b) comprises a straight steel strip and a corrugated steel strip, and is formed by rolling a plurality of straight steel strips and corrugated steel strips by interlacing, laminating and rolling each other, a fire-blocking channel is formed between the straight steel strips and the corrugated steel strips, and the thickness of the fire-blocking disc (105b) is 10 mm.

6. The negative pressure end detection device of the breathing valve according to claim 5, characterized in that: The valve body (201) comprises a negative pressure end (201a) and a vacuum end (201b), the detection assembly (100) is connected to the negative pressure end (201a), the adjustment component (203) is installed on the top of the vacuum end (201b), and the pressure relief component (202) is installed inside the vacuum end (201b).

7. The negative pressure end detection device of the breathing valve according to claim 6, characterized in that: The pressure relief component (202) comprises a second valve seat (202a), a valve flap (202b), a valve stem (202c) and a pressure relief chamber (202d); the second valve seat (202a) is fixed to the vacuum end (201b) by bolts; the bottom of the valve flap (202b) is embedded in the top of the second valve seat (202a); the bottom of the valve stem (202c) is fixed to the top of the valve flap (202b); and the space at the top of the valve flap (202b) is the pressure relief chamber (202d).

8. The negative pressure end detection device of the breathing valve according to claim 7, characterized in that: The regulating member (203) comprises a valve cover (203a), a guide sleeve (203b) and a spring (203c); the guide sleeve (203b) is sleeved on the top of the valve stem (202c); the top of the guide sleeve (203b) is fixed to the bottom of the spring (203c); and the guide sleeve (203b) passes through the middle of the valve cover (203a).

9. The negative pressure end detection device of the breathing valve according to claim 8, characterized in that: The adjusting member (203) further comprises an adjusting screw (203d) and a valve sleeve (203e); the bottom of the adjusting screw (203d) is fixed to the top of the spring (203c); the bottom of the valve sleeve (203e) is fixed to the top of the valve cover (203a); the interior of the valve sleeve (203e) is hollow; the adjusting screw (203d), the guide sleeve (203b) and the spring (203c) are located inside the valve sleeve (203e).

10. The negative pressure end detection device of the breathing valve according to claim 9, characterized in that: The regulating member (203) further comprises a valve bonnet (203f), wherein the valve bonnet (203f) is threadedly connected to the top of the valve sleeve (203e), and the top of the regulating screw (203d) extends into the interior of the valve bonnet (203f) and is connected to the inner wall of the valve bonnet (203f).

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