Liquid sealed breathing valve and method thereof

Abstract

The application discloses a kind of liquid seal breathing valve and method thereof, including the lower valve seat and upper insertion tube type valve cover of split arrangement;Lower valve seat is provided with the butt flange at lower end, and upper end is set to double sleeve structure;The upper end of double sleeve structure is open, including coaxially arranged inner sleeve, outer sleeve;Upper insertion tube type valve cover includes top cover and the insertion tube installed below top cover;Ball valve and pressure gauge are installed on top cover, and insertion tube is provided with several notches on the pipe wall close to lower end;Insertion tube is inserted between inner sleeve and outer sleeve, until the lower end of insertion tube is directly placed on lower valve seat, and the area surrounded by inner sleeve and outer sleeve is injected with sealing oil.It can be seen from this that the liquid seal breathing valve can realize the function failure of sealing liquid in extreme conditions, and when the upper limit of positive pressure fails to normally release pressure, the upper insertion tube type valve cover can be opened by positive pressure, so as to realize the purpose of releasing tank pressure, so that the liquid seal breathing valve has safety function.

Description

TECHNICAL FIELD

[0001] The present application relates to a breathing valve, in particular a liquid seal breathing valve suitable for atmospheric storage tank. BACKGROUND

[0002] During the use of atmospheric and low-pressure storage tanks, the gas in the storage tank will expand or shrink due to the change of liquid level in the storage tank or the change of external temperature, and the pressure of the gas phase in the storage tank will fluctuate. The fluctuation of the gas pressure is prone to cause overpressure or vacuum in the storage tank, and in severe cases, it will cause the storage tank to be overpressured or low-pressured.

[0003] In order to prevent the storage tank from being in an unstable state such as overpressure or negative pressure, a breathing valve is usually installed on the top of the tank in the process design to maintain the pressure balance of the storage tank, ensure the safety of the storage tank in overpressure or vacuum, and reduce the volatilization and loss of the material in the storage tank, which promotes safety and environmental protection.

[0004] The breathing valve fully utilizes the pressure-bearing capacity of the storage tank to reduce the emission of the medium. The principle is to use the weight of the positive and negative pressure valve disc to control the exhaust positive pressure and the suction negative pressure of the storage tank. When the pressure of the medium in the tank is within the control operating pressure range of the breathing valve, the breathing valve does not work, maintaining the airtightness of the tank; when the medium is supplemented into the tank, the pressure of the gas space in the upper part of the tank rises to the operating pressure of the breathing valve, the pressure valve is opened, and the gas escapes from the breathing valve outlet, so that the pressure in the tank no longer continues to rise; when the medium is extracted out of the tank, the pressure of the gas space in the upper part of the tank decreases to the operating negative pressure of the breathing valve, and the atmosphere outside the tank will open the negative pressure valve disc of the breathing valve to open, so that the external gas enters the tank, so that the pressure in the tank no longer continues to decrease, and the pressure balance between the inside and outside of the tank is achieved to protect the safety device of the storage tank.

[0005] Most of the existing breathing valves are mechanical breathing valves. Once the breathing valve is triggered, it is easy to cause the sealing surface to deviate and cause gas leakage, pollute the environment, and even cause fire hazards.

[0006] The utility model discloses a liquid seal breathing valve, including the valve body that is combined by the liquid seal cylinder of periphery and the liquid -resisting cylinder that is built -in in the liquid seal cylinder, the top surface of valve body is fixed with the valve cover, and the edge of valve cover top surface is installed with the liquid storage tank, the bottom surface of liquid storage tank is connected with the liquid supplementing pipe, and one end of liquid supplementing pipe is connected with the check valve through the liquid -resisting cylinder, the negative pressure chamber is seted up in the liquid -resisting cylinder, the gap of liquid -resisting cylinder and liquid seal cylinder constitutes the positive pressure chamber, the positive and negative pressure signal collector and the liquid -lack sight glass are equipped on the outside of liquid seal cylinder, and the positive pressure chamber is communicated through the upper and lower holes and the connecting pipe of positive and negative pressure signal collector, the low liquid level signal acquisition system is installed on the inner wall surface of liquid storage tank, the float is arranged in the positive and negative pressure signal collector, and the positive pressure overpressure signal acquisition system and the negative pressure overpressure signal acquisition system are arranged from top to bottom on the side surface of float, the straight pipe is arranged on the outside of valve body, and one end of straight pipe is communicated with the liquid -resisting cylinder through the valve body, the positive pressure liquid collecting groove is arranged on the upper side surface of liquid seal cylinder, and the positive pressure liquid collecting groove is communicated with the positive pressure chamber, the fire -resisting system is installed on one side of positive pressure liquid collecting groove, and the fire -resisting device is installed in the fire -resisting system, the elbow is installed on the edge of the bottom surface of valve body, and the sealing liquid is filled in the positive pressure chamber and the negative pressure chamber. SUMMARY

[0007] The technical problem of the present application is to provide a liquid seal breathing valve which can effectively solve the problem of leakage and has the advantage of convenient maintenance.

[0008] To achieve the above technical problem, the present application adopts the following technical solution:

[0009] A liquid seal breathing valve comprises a lower valve seat and an upper plug-in pipe valve cover arranged separately.

[0010] The lower valve seat is provided with a butt flange at the lower end and a double sleeve structure at the upper end.

[0011] The upper plug-in pipe valve cover comprises a top cover and a plug-in pipe installed below the top cover.

[0012] The insertion tube is inserted between the inner sleeve and the outer sleeve until the lower end of the insertion tube is directly placed on the lower valve seat, at this time, the top cover can cover the outer sleeve, and gaps exist between the top cover and the upper end of the outer sleeve and the upper end of the inner sleeve, at the same time, the inner sleeve and the insertion tube are sealed by the first packing structure, and the insertion tube and the outer sleeve are sealed by the second packing structure, at the same time, the area surrounded by the inner sleeve and the outer sleeve is injected with sealing oil, and the height of the sealing oil at least exceeds the notch of the insertion tube in the initial state, so that the area between the inner sleeve and the insertion tube below the first packing structure and above the sealing oil forms a positive pressure cavity, and the area between the insertion tube and the outer sleeve below the second packing structure and above the sealing oil forms a negative pressure cavity.

[0013] Preferably, an oil injection port and an oil discharge port are provided through the pipe wall of the outer sleeve; the sealing oil is injected through the oil injection port and flows out through the oil discharge port.

[0014] Preferably, the first packing structure includes a first annular groove and a first packing filled in the first annular groove, and the first annular groove is arranged at the position close to the upper end of the outer wall of the inner sleeve; the second packing structure includes a second annular groove and a second packing filled in the second annular groove, and the second annular groove is arranged at the position close to the upper end of the outer wall of the insertion tube.

[0015] Preferably, it further comprises an online monitoring and management device; the online monitoring and management device comprises a liquid monitor, a data processing device and an alarm, and the liquid monitor, the data processing device and the alarm are connected through data transmission lines; wherein:

[0016] The liquid monitor is arranged close to the upper part of the first and second packing, and at least one liquid monitor is arranged for monitoring the overflow of the sealing oil at the upper part of the first and second packing, and the detected data can be fed back to the data processing device;

[0017] The data processing device judges whether there is overflow of the sealing oil at the upper part of the first and second packing according to the signal fed back by the liquid monitor; when the signal fed back by the liquid monitor indicates that the sealing oil overflows the packing, an alarm execution instruction is sent to the alarm to trigger the alarm and issue a warning.

[0018] Preferably, the liquid monitor comprises more than three liquid accumulation discs and liquid level meters installed in each liquid accumulation disc; each liquid accumulation disc is arranged close to the upper part of the first or second packing.

[0019] Preferably, the first annular groove includes third and fourth partitions, and the third and fourth partitions are parallelly and spacedly welded on the outer wall of the inner sleeve.

[0020] The second annular groove includes first and second partitions; the first and second partitions are parallelly and spacedly welded on the outer wall of the insertion tube.

[0021] Preferably, the cannula is two-sectioned, corresponding to an upper cannula section and a lower cannula section; the inner diameter of the upper cannula section is smaller than that of the lower cannula section, and the upper end of the upper cannula section is connected to the lower surface of the top plate, while the lower end of the upper cannula section is outwardly bent to form an extension; the end of the lower end extension of the upper cannula section is connected to the upper end of the lower cannula section, and the lower end of the lower cannula section is uniformly provided with a plurality of notches; the lower end of the lower cannula section is equipped with a bottom ring.

[0022] Preferably, the top cover comprises a top plate and a sleeve pipe connected to the end of the top plate and below the top plate; the pipe wall of the sleeve pipe is equipped with a strip-shaped sight glass.

[0023] Another technical purpose of the present application is to provide a method for using the liquid-sealed breathing valve, comprising the following steps:

[0024] Step one, assembling the liquid-sealed breathing valve:

[0025] Step 1.1, separately preparing the upper cannula-type valve cover and the lower valve seat:

[0026] Separately manufacturing the upper cannula-type valve cover and the lower valve seat;

[0027] Step 1.2, inserting the cannula of the upper cannula-type valve cover between the inner sleeve pipe and the outer sleeve pipe of the lower valve seat until the lower end of the cannula directly contacts the circular ring-shaped bottom plate, so that the sleeve pipe covers the outside of the outer sleeve pipe, a sealed positive pressure cavity is formed between the cannula and the inner sleeve pipe, a sealed negative pressure cavity is formed between the cannula and the outer sleeve pipe, and the positive pressure cavity and the negative pressure cavity are communicated through the notches provided on the lower section of the cannula;

[0028] Step 1.3, connecting the lower end of the sleeve pipe to the pipe wall of the outer sleeve pipe by using an anti-detachment chain;

[0029] Step 1.4, injecting sealing oil into the negative pressure cavity through the oil injection port until the height of the sealing oil in the positive pressure cavity and the negative pressure cavity reaches a preset height;

[0030] Step two, installing the liquid-sealed breathing valve on the storage tank:

[0031] Connecting the butt flange provided at the lower end of the lower valve seat to the matching flange provided on the storage tank;

[0032] Installing an in-tank pressure detector in the storage tank;

[0033] Step three, monitoring the pressure of the storage tank and the leakage of the sealing oil in real time:

[0034] Monitoring whether there is spilled sealing oil on the upper part of the first and second fillers by using the liquid monitor installed on the upper part of the first and second fillers, and triggering the alarm to issue a warning reminder when the signal fed back by the liquid monitor indicates that the sealing oil has spilled the filler;

[0035] The difference between the data fed back by the in-tank pressure detector installed in the storage tank and the data fed back by the pressure gauge is determined, and when the difference between the data fed back by the in-tank pressure detector and the data fed back by the pressure gauge exceeds the preset pressure difference threshold in the online monitoring management device, an alarm is triggered to issue a warning.

[0036] Based on the above technical purposes, the present application has the following advantages compared with the prior art:

[0037] 1、The liquid seal breathing valve has the lower valve seat and the upper tubular valve cover arranged in two separate structures, so that in an extreme case, the sealing liquid function fails, and when the upper tubular valve cover can be opened by the positive pressure to achieve the purpose of releasing the tank pressure, the liquid seal breathing valve has a safety function.

[0038] 2、The liquid seal breathing valve is provided with a packing structure at the upper part of the positive pressure chamber and the negative pressure chamber, which prevents part of the sealing oil from forming bubbles with the airflow after flowing through the sealing oil, so as to be flushed out of the positive pressure chamber / negative pressure chamber, causing the loss of sealing oil and affecting the normal pressure relief capacity of the liquid seal breathing valve.

[0039] 3、The liquid seal breathing valve is provided with an online monitoring management device, which monitors the leakage of the sealing oil to avoid abnormal loss of the sealing oil, and monitors the pressure relief effectiveness of the breathing valve, that is, it evaluates the difference between the tank pressure and the pressure after being processed by the liquid seal breathing valve.

[0040] 4、The liquid seal breathing valve is provided with an openable and closable sealing cover above the inner sleeve, which effectively isolates the device from the storage tank when the sealing cover seals the upper end of the inner sleeve, and the device is subjected to online positive and negative pressure verification (without disassembling the liquid seal breathing valve) through the verification pressure hole of the device body. The device is conveniently and quickly verified regularly. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is a structural schematic view of the liquid seal breathing valve (embodiment 1) of the present application;

[0042] Figure 2 is a sectional view of the lower segment of the inner sleeve; Figure 1

[0043] Figure 3 is a structural schematic view of the liquid seal breathing valve (labeled with fluid flow direction) of the present application;

[0044] Figure 4 ​is a structural schematic diagram of the liquid seal breathing valve (Embodiment 2) described in the present application;

[0045] In the drawings: 1 - butt flange; 2 - outer short tube; 3 - inner sleeve; 4 - upper section of cannula; 5 - outer sleeve; 6 - lower section of cannula; 7 - outer cover tube; 8 - top plate; 9 - extension section; 10 - bottom plate; 11 - first partition plate; 12 - second partition plate; 13 - third partition plate; 14 - fourth partition plate; 15 - first packing; 16 - second packing; 17 - strip-shaped sight glass; 18 - bottom ring tube; 19-1, oil filling port; 19-2, oil discharge port; 20 - handle; 21 - ball valve; 22 - pressure gauge; 23 - anti-dropping chain; 24 - sealing cover. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way limits the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application. Unless otherwise specified, the relative arrangement, expressions and values of the components and steps set forth in these embodiments do not limit the scope of the present application. The technology, methods and devices known to those skilled in the related art can not be discussed in detail, but should be considered as part of the specification in appropriate cases. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments can have different values.

[0047] For ease of description, spatial relative terms such as "over", "above", "upper surface", "upper", etc. can be used herein to describe the spatial positional relationship of one device or feature with respect to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device as described in the drawings. For example, if the device in the drawings is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations).

[0048] As Figures 1 to 4As shown, the liquid seal breathing valve comprises an online monitoring management device, a lower valve seat and an upper insertion pipe type valve cover.

[0049] The lower valve seat is provided with a butt flange 1 at the lower end and a double sleeve structure at the upper end; the double sleeve structure is open at the upper end and comprises an inner sleeve 3 and an outer sleeve 5 arranged coaxially; the outer sleeve 5 is provided with an oil injection port 19-1 and an oil discharge port 19-2; the sealing oil is injected through the oil injection port 19-1 and flows out through the oil discharge port 19-2; and the outer sleeve 5 is provided with a strip-shaped sight glass 17.

[0050] The upper insertion pipe type valve cover comprises a top cover and an insertion pipe installed below the top cover; the top cover is provided with a ball valve 21 and a pressure gauge 22; the top cover comprises a top plate 8 and an outer cover pipe 7 connected to the end of the top plate 8 and below the top plate 8; and the insertion pipe is provided with a plurality of circumferentially uniformly distributed notches on the pipe wall near the lower end.

[0051] The insertion pipe is inserted between the inner sleeve 3 and the outer sleeve 5 until the lower end of the insertion pipe is directly placed on the lower valve seat; at this time, the top cover can cover the outer sleeve 5, and there is a gap between the top cover and the upper end of the outer sleeve 5 and the upper end of the inner sleeve 3; at the same time, the inner sleeve 3 and the insertion pipe are sealed by a first packing structure, and the insertion pipe and the outer sleeve 5 are sealed by a second packing structure; at the same time, the area surrounded by the inner sleeve 3 and the outer sleeve 5 is injected with sealing oil, and the height of the sealing oil in the initial state is at least higher than the notch of the insertion pipe, so that the area below the first packing structure and above the sealing oil between the inner sleeve 3 and the insertion pipe forms a positive pressure cavity, and the area below the second packing structure and above the sealing oil between the insertion pipe and the outer sleeve 5 forms a negative pressure cavity; in the present application, the first packing structure comprises a first annular groove and a first packing 15 filled in the first annular groove; the first annular groove is arranged at the position near the upper end of the outer wall of the inner sleeve 3, and the first annular groove comprises a third partition plate 13 and a fourth partition plate 14 which are spaced apart and welded parallel to each other on the outer wall of the inner sleeve 3; the second packing structure comprises a second annular groove and a second packing 16 filled in the second annular groove; the second annular groove is arranged at the position near the upper end of the outer wall of the insertion pipe; specifically, the second annular groove comprises a first partition plate 11 and a second partition plate 12 which are spaced apart and welded parallel to each other on the outer wall of the insertion pipe.

[0052] The cannula is composed of two sections, namely an upper section 4 and a lower section 6. The inner diameter of the upper section 4 is smaller than that of the lower section 6, and the upper end of the upper section 4 is connected to the lower surface of the top plate 8, while the lower end of the upper section 4 is bent outward to form an extension section 9. The lower end of the extension section 9 of the upper section 4 is connected and fixed to the upper end of the lower section 6, while the lower end of the lower section 6 has several notches evenly arranged. The lower end of the lower section 6 is equipped with a bottom ring tube 18.

[0053] The online monitoring and management equipment includes a liquid monitor, a tank pressure detector, a data processing device, and an alarm. The liquid monitor, data processing device, and alarm are connected via data transmission lines.

[0054] Liquid monitors are installed on the top of the first and second packings respectively to monitor the sealing oil overflowing from the top of the first and second packings and to feed the detected data back to the data processing equipment.

[0055] The data processing equipment determines whether there is sealing oil overflowing from the top of the first and second packings based on the signal fed back by the liquid monitor. When the signal fed back by the liquid monitor indicates that sealing oil has overflowed from the packing, it sends an alarm execution command to the alarm to trigger the alarm and issue a warning.

[0056] The tank pressure detector is installed in the storage tank to monitor the pressure inside the tank and can feed back the detected values ​​to the online monitoring and management equipment.

[0057] The data detected by pressure gauge 22 can also be fed back to the online monitoring and management equipment;

[0058] The online monitoring and management equipment determines the difference between the data fed back by the tank pressure detector and the data fed back by the pressure gauge 22. When the difference between the data fed back by the tank pressure detector and the data fed back by the pressure gauge 22 exceeds the preset differential pressure threshold in the online monitoring and management equipment, the alarm is triggered and a warning is issued.

[0059] To enable the breather valve of this invention to have an online calibration function, the upper end (open end) of the inner sleeve 3 is equipped with an openable sealing cap 24. The upper end of the sealing cap 24 is connected to the power output end of the opening mechanism, which is mounted on the top cover. Under the power actuation of the opening mechanism, the sealing cap 24 seals / opens the upper end of the inner sleeve 3. When the sealing cap 24 seals the upper end of the inner sleeve 3, the equipment is effectively isolated from the storage tank, and positive and negative pressure calibration is performed on the equipment through the calibration and pressure test hole on the equipment body. This allows for convenient and quick periodic calibration of the equipment.

[0060] The liquid-sealed breather valve is connected to the tank body through the docking flange 1. The cavity space where the inner sleeve 3 is located is connected to the tank space, and the pressure is mutually exchanged. When the positive pressure is formed in the tank, the sealing oil between the inner sleeve 3 and the insertion pipe is squeezed to flow to the insertion pipe and the outer sleeve 5, releasing the pressure in the tank, which is the positive pressure chamber.

[0061] When negative pressure is formed inside the tank, the sealing oil between the outer sleeve 5 and the insertion tube is squeezed and flows to the insertion tube and the inner sleeve 3 to replenish the pressure inside the tank, which is the negative pressure chamber.

[0062] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0063] Example 1

[0064] like Figures 1-3 As shown, this embodiment discloses a liquid-sealed breather valve, including a separate lower valve seat and an upper tubular valve cover; wherein:

[0065] The lower valve seat includes a connecting flange 1, an outer short pipe 2, an inner sleeve 3, an outer sleeve 5, and a base plate 10. The connecting flange 1 is welded to the lower end of the outer short pipe 2 for connection to the storage tank. A circular base plate 10 is welded to the outer side of the upper end of the outer short pipe 2, and the inner sleeve 3 and outer sleeve 5 are coaxially arranged on the circular base plate 10. The lower ends of the inner sleeve 3 and outer sleeve 5 are welded to the circular base plate 10. A first annular groove is arranged on the outer wall of the inner sleeve 3 near the upper end, and a first filler 15 is filled in the first annular groove. The first annular groove is formed by two partitions welded to the outer wall of the inner sleeve 3. These two partitions correspond to the third and fourth partitions 14, have the same shape, and are arranged parallel to each other. The outer sleeve 5 has a through-hole oil filling port 19-1 on its wall; there are two oil filling ports 19-1, one located near the bottom of the outer sleeve 5 wall and the other located in the middle of the outer sleeve 5 wall. In addition, the outer sleeve 5 is fitted with a strip-shaped sight glass 17 for observing the height change of the sealing oil in the outer cavity.

[0066] The upper insertion pipe type valve cover comprises a top plate 8 and an insertion pipe and an outer cover pipe 7 respectively installed below the top plate 8; the top plate 8 is provided with a ball valve 21 and a pressure gauge 22, and a handle 20 is installed on the top plate 8 to facilitate lifting of the upper insertion pipe type valve cover. The insertion pipe is two-sectioned, corresponding to an upper insertion pipe section 4 and a lower insertion pipe section 6; the inner diameter of the upper insertion pipe section 4 is smaller than that of the lower insertion pipe section 6, the upper end of the upper insertion pipe section 4 is connected with the lower surface of the top plate 8, the lower end of the upper insertion pipe section 4 is outwardly bent to form an outward extension section 9, in addition, a second annular embedding groove is arranged on the outer wall of the upper insertion pipe section 4, the second annular embedding groove is filled with second filler, and the second annular embedding groove is formed by two partition plates, i.e. a first partition plate and a second partition plate 12, which are arranged in parallel and have the same shape; the end of the outward extension section 9 of the lower end of the upper insertion pipe section 4 is welded and fixed with the upper end of the lower insertion pipe section 6, and the lower end of the lower insertion pipe section 6 is uniformly provided with a plurality of notches, and the lower end of the lower insertion pipe section 6 is provided with a bottom annular pipe 18. The upper end of the outer cover pipe 7 is welded and fixed with the end of the top plate 8.

[0067] During assembly, the insertion pipe of the upper insertion pipe type valve cover is inserted between the inner sleeve pipe 3 and the outer sleeve pipe 5 of the lower valve seat until the lower end of the insertion pipe directly contacts the circular ring-shaped bottom plate 10, at this time, the outer cover pipe 7 is covered outside the outer sleeve pipe 5, a sealed positive pressure cavity is formed between the insertion pipe and the inner sleeve pipe 3, a sealed negative pressure cavity is formed between the insertion pipe and the outer sleeve pipe 5, the positive pressure cavity and the negative pressure cavity are communicated through the notches arranged on the lower insertion pipe section 6, and the lower end of the outer cover pipe 7 is connected with the pipe wall of the outer sleeve pipe 5 through the anti-untwisting chain 23. Finally, sealing oil is injected into the negative pressure cavity through the oil injection port 19-1 until the height of the sealing oil in the positive pressure cavity and the negative pressure cavity reaches a preset height.

[0068] In order to enable the liquid seal breathing valve to have an online monitoring function, in one aspect, the pressure in the tank is monitored online, and the pressure value controlled by the equipment is compared in real time, and when an abnormality occurs, an alarm can be given in the first time and handled in time. On the other hand, the liquid monitoring is arranged on the upper part of the structured packing (first filler 15 / second filler), and once it is found that the liquid overflows the packing, an alarm is given immediately and handled. The abnormal loss of sealing oil can be avoided. Specifically, a liquid collecting groove is arranged near the upper part of the first filler 15 / second filler, and a liquid level monitor is installed in the liquid collecting groove. When the detection result fed back by the liquid level monitor indicates that there is liquid exceeding a preset value in the liquid collecting groove, an alarm device is triggered, indicating that the sealing oil in the positive pressure cavity and the negative pressure cavity overflows the first filler 15 / second filler 16, and the breathing valve needs to be checked.

[0069] Example 2

[0070] As Figure 4As shown, the embodiment is consistent with most of the structure of embodiment 1, the difference is only that the upper end of the inner sleeve 3 is equipped with an openable sealing cover 24, so as to effectively isolate the liquid-sealed breathing valve of the present application from the storage tank, and the positive and negative pressure of the equipment is checked through the check pressure hole of the equipment body. The equipment is convenient and fast to realize the periodic check. After the check is completed, the sealing cover 24 can be lifted upward by starting the lifting mechanism connected with the sealing cover 24, thereby realizing the communication between the valve cavity and the storage tank.

[0071] Embodiment 3

[0072] Based on the above-mentioned liquid-sealed breathing valve, the embodiment provides a use method, comprising the following steps:

[0073] Step one, assemble the liquid-sealed breathing valve:

[0074] Step 1.1, prepare the upper insertion tube type valve cover and the lower valve seat separately:

[0075] The upper insertion tube type valve cover and the lower valve seat are manufactured respectively;

[0076] Step 1.2, insert the insertion tube of the upper insertion tube type valve cover between the inner sleeve and the outer sleeve of the lower valve seat until the lower end of the insertion tube directly contacts the circular ring-shaped bottom plate, so that the outer cover pipe covers the outside of the outer sleeve, and a sealed positive pressure cavity is formed between the insertion tube and the inner sleeve, a sealed negative pressure cavity is formed between the insertion tube and the outer sleeve, and the positive pressure cavity and the negative pressure cavity are communicated through the gap provided in the lower section of the insertion tube;

[0077] Step 1.3, connect the lower end of the outer cover pipe with the pipe wall of the outer sleeve by using an anti-unlinking chain;

[0078] Step 1.4, inject sealing oil into the negative pressure cavity through the oil injection port until the height of the sealing oil in the positive pressure cavity and the negative pressure cavity reaches the preset height;

[0079] Step two, install the liquid-sealed breathing valve on the storage tank:

[0080] Connect the butt flange provided at the lower end of the lower valve seat with the matching flange provided on the storage tank;

[0081] Install the in-tank pressure detector in the storage tank;

[0082] Step three, monitor the pressure of the storage tank and the leakage of the sealing oil in real time:

[0083] Through the liquid monitor installed on the upper part of the first and second packing, whether there is overflow of the sealing oil on the upper part of the first and second packing is monitored, when the signal feedback by the liquid monitor indicates that the sealing oil overflows the packing, an alarm execution instruction is sent to the alarm to trigger the alarm and issue a warning;

[0084] The difference between the data fed back by the in-tank pressure detector and the data fed back by the pressure gauge is judged through the data fed back by the in-tank pressure detector and the data fed back by the pressure gauge installed in the storage tank, and when the difference between the data fed back by the in-tank pressure detector and the data fed back by the pressure gauge exceeds the preset pressure difference threshold in the online monitoring management device, the alarm is triggered to issue a warning.

Claims

1. A liquid sealed breathing valve characterized by, It comprises a lower valve seat and an upper pipe-inserted valve cover which are arranged separately; wherein: The lower valve seat is provided with a butt flange at the lower end and a double-sleeve structure at the upper end; the double-sleeve structure is provided with an open upper end and comprises coaxially arranged inner and outer sleeves; The upper pipe-inserted valve cover comprises a top cover and a pipe inserted below the top cover; a ball valve and a pressure gauge are mounted on the top cover; the pipe is provided with a plurality of circumferentially uniformly distributed notches on the wall near the lower end; The pipe is inserted between the inner and outer sleeves until the lower end of the pipe is directly placed on the lower valve seat; at this time, the top cover can cover the outer sleeve, and gaps exist between the top cover and the upper end of the outer sleeve and the upper end of the inner sleeve; meanwhile, the inner sleeve and the pipe are sealed by the first packing structure, and the pipe and the outer sleeve are sealed by the second packing structure; meanwhile, the area surrounded by the inner sleeve and the outer sleeve is filled with sealing oil, and the height of the sealing oil in the initial state is at least higher than the notches of the pipe, so that a positive pressure cavity is formed in the area below the first packing structure and above the sealing oil between the inner sleeve and the pipe, and a negative pressure cavity is formed in the area below the second packing structure and above the sealing oil between the pipe and the outer sleeve; The first packing structure comprises a first annular groove and a first packing filled in the first annular groove, and the first annular groove is arranged on the outer wall of the inner sleeve near the upper end; the second packing structure comprises a second annular groove and a second packing filled in the second annular groove, and the second annular groove is arranged on the outer wall of the pipe near the upper end; It also comprises an online monitoring management device; the online monitoring management device comprises a liquid monitor, a data processing device, and an alarm; the liquid monitor, the data processing device, and the alarm are connected by data transmission lines; wherein: The liquid monitor is installed at least one on the upper part of the first and second packing, used to monitor the sealing oil overflowed from the upper part of the first and second packing, and can feed back the detected data to the data processing device; The data processing device judges whether there is sealing oil overflow on the upper part of the first and second packing according to the signals fed back by the liquid monitor; when the signals fed back by the liquid monitor indicate that the sealing oil overflows the packing, an alarm execution instruction is sent to the alarm to trigger the alarm and issue a warning; The pipe is two-sectioned, corresponding to an upper pipe section and a lower pipe section; the inner diameter of the upper pipe section is smaller than that of the lower pipe section, and the upper end of the upper pipe section is connected with the lower surface of the top plate, and the lower end of the upper pipe section is outwardly bent to form an outward extension section; the end of the outward extension section of the lower end of the upper pipe section is connected and fixed with the upper end of the lower pipe section, and the lower end of the lower pipe section is uniformly arranged with a plurality of notches; the lower end of the lower pipe section is equipped with a bottom ring pipe.

2. The liquid sealed breathing valve of claim 1, wherein, The outer sleeve is provided with an oil injection port and an oil discharge port through the wall; the sealing oil is injected through the oil injection port and flows out through the oil discharge port.

3. The liquid sealed breathing valve of claim 2, wherein, The online monitoring management device further comprises an in-tank pressure detector; The in-tank pressure detector is installed in the storage tank and is used to monitor the pressure in the storage tank and can feed back the detected data to the online monitoring management device; The data detected by the pressure gauge can also be fed back to the online monitoring management device; The online monitoring management device judges the difference between the data fed back by the tank pressure detector and the data fed back by the pressure gauge according to the data fed back by the tank pressure detector and the data fed back by the pressure gauge, and triggers the alarm to issue a warning when the difference between the data fed back by the tank pressure detector and the data fed back by the pressure gauge exceeds the preset pressure difference threshold in the online monitoring management device.

4. The liquid sealed breathing valve of claim 2, wherein, The liquid monitor comprises three or more liquid accumulation discs and liquid level gauges installed in the liquid accumulation discs; each liquid accumulation disc is uniformly arranged on the upper part of the first or second filler.

5. The liquid sealed breathing valve of claim 2, wherein, The first annular groove comprises third and fourth partitions which are spaced apart and welded in parallel on the outer wall of the inner sleeve; The second annular groove comprises first and second partitions which are spaced apart and welded in parallel on the outer wall of the insertion pipe.

6. The liquid sealed breathing valve of claim 1, wherein, The top cover comprises a top plate and a cover pipe connected to the end of the top plate and below the top plate; the pipe wall of the cover pipe is provided with a strip-shaped sight glass.

7. A method of using the liquid sealed breathing valve of claim 1, wherein, The method comprises the following steps: Step one, assembling the liquid seal breather valve: Step 1.1, preparing the upper insertion pipe type valve cover and the lower valve seat separately: Prepare the upper insertion pipe type valve cover and the lower valve seat separately; Step 1.2, insert the insertion pipe of the upper insertion pipe type valve cover between the inner sleeve and the outer sleeve of the lower valve seat until the lower end of the insertion pipe directly contacts the circular bottom plate, so that the cover pipe covers the outer side of the outer sleeve, and a sealed positive pressure cavity is formed between the insertion pipe and the inner sleeve, a sealed negative pressure cavity is formed between the insertion pipe and the outer sleeve, and the positive pressure cavity and the negative pressure cavity are communicated through the gap provided on the lower section of the insertion pipe; Step 1.3, connect the lower end of the cover pipe with the pipe wall of the outer sleeve by using the anti-loose chain; Step 1.4, inject sealing oil into the negative pressure cavity through the oil injection port until the height of the sealing oil in the positive pressure cavity and the negative pressure cavity reaches the preset height; Step two, installing the liquid seal breather valve on the storage tank: Connect the butt flange provided on the lower end of the lower valve seat with the matching flange provided on the storage tank; Install the tank pressure detector in the storage tank; Step three, online real-time monitoring of the pressure of the storage tank and the leakage of the sealing oil: Through the liquid monitor installed on the upper part of the first and second fillers, whether the sealing oil overflows the fillers is monitored, and when the signal fed back by the liquid monitor indicates that the sealing oil overflows the fillers, an alarm execution instruction is sent to the alarm to trigger the alarm and issue a warning; The difference between the data fed back by the tank pressure detector and the data fed back by the pressure gauge is judged according to the data fed back by the tank pressure detector and the data fed back by the pressure gauge, and when the difference between the data fed back by the tank pressure detector and the data fed back by the pressure gauge exceeds the preset pressure difference threshold in the online monitoring management device, the alarm is triggered to issue a warning.

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