Regulating device for set pressure of breather valve and pilot-operated breather valve

Abstract

The utility model provides a breather valve set pressure adjusting device and a pilot-operated breather valve, and relates to the field of breather valves. The set pressure adjusting device for the breather valve comprises a first mandrel and a second mandrel, wherein one end of the first mandrel is connected with a valve body of the breather valve through a linear elastic element; the second mandrel is coaxially coupled with the first mandrel, and the second mandrel is connected with a first valve clack of the breather valve; a lifting structure is arranged at the coupling position of the first mandrel and the second mandrel and can adjust the relative position of the first mandrel and the second mandrel in the axis direction, the linear elastic element is made to change in the dimension in the axis direction, and therefore the pressure, acting on an internal communication opening of the breather valve, of the first valve clack is changed. Changing the set pressure of the breather valve; under the condition that the internal structure of the breather valve is not disassembled, the state of the diaphragm can be quickly and efficiently adjusted, and the set pressure of the pilot-operated breather valve can be adjusted.

Description

Technical Field

[0001] The utility model relates to the field of breathing valves, in particular to a breathing valve setting pressure regulating device and a pilot-operated breathing valve. Background Art

[0002] A breathing valve is a safety and energy-saving device used to balance air pressure in storage tanks. Its core principle is to utilize the pressure of positive and negative pressure valve discs to control the positive exhaust pressure and negative intake pressure of the tank, ensuring that the pressure inside the tank does not continue to drop or rise, thus achieving equilibrium between the air pressure inside and outside the tank. Breathing valves can be categorized as gravity-operated, spring-loaded, and pilot-operated. Pilot-operated breathing valves are an improved design that utilizes a pilot valve for regulation, providing overpressure protection and reducing evaporation and exhaust volume, thereby lowering product loss and emissions treatment costs.

[0003] The set pressure of the breathing valve is an important parameter, including the exhalation pressure and the inhalation pressure. The exhalation pressure of the breathing valve refers to the set pressure at which the pressure valve opens and the gas in the tank is discharged when the pressure in the storage tank rises to a certain value. In the prior art, the pilot-operated breathing valve needs to change the set pressure by adjusting the diaphragm to adapt to different containers and different media in the container or different external environments. However, the existing pilot-operated breathing valve diaphragm adjustment usually requires disassembling the valve body and partition, etc., and due to the uneven thickness of the diaphragm, the diaphragm needs to be repeatedly adjusted and disassembled. This process is time-consuming, labor-intensive, and inefficient, and will result in waste of the diaphragm. Utility Model Content

[0004] The utility model aims to solve the problem in the prior art that a pilot-operated breathing valve needs to repeatedly adjust and disassemble the diaphragm when adjusting the set pressure, resulting in low adjustment efficiency and waste of the diaphragm. The utility model provides a breathing valve set pressure adjustment device and a pilot-operated breathing valve, which can quickly and efficiently adjust the state of the diaphragm and adjust the set pressure of the pilot-operated breathing valve without disassembling the internal structure of the pilot-operated breathing valve.

[0005] The technical solution adopted in this utility model is:

[0006] A breathing valve set pressure regulating device, comprising:

[0007] A first spindle, one end of which is connected to the valve body of the breathing valve via a linear elastic element; and

[0008] a second spindle, coaxially coupled to the first spindle, and the second spindle is connected to the first valve disc of the breathing valve;

[0009] Among them, a lifting structure is provided at the coupling point of the first spindle and the second spindle, and the lifting structure can adjust the relative positions of the first spindle and the second spindle along the axial direction, so that the dimension of the linear elastic element along the axial direction changes, thereby changing the pressure of the first valve disc acting on the internal connecting port of the breathing valve, so that the set pressure of the breathing valve changes.

[0010] Furthermore, the second spindle is inserted into the lower end opening of the first spindle; the lifting structure includes an external thread on the upper part of the second spindle and an adjusting nut arranged outside the second spindle, and the upper surface of the adjusting nut abuts against the lower end of the first spindle.

[0011] Furthermore, the first spindle is inserted into the upper end opening of the second spindle; the lifting structure includes an external thread on the lower part of the first spindle and an adjusting nut arranged outside the first spindle, and the lower surface of the adjusting nut abuts against the upper end of the second spindle.

[0012] Furthermore, the second spindle is inserted into the lower end opening of the first spindle; the lifting structure includes a plurality of first sockets on the first spindle and a plurality of second sockets on the second spindle, and pins that can be inserted into the first sockets and the second sockets.

[0013] Furthermore, the second spindle is inserted into the lower end opening of the first spindle; the lifting structure includes an external thread and a worm gear mechanism on the upper part of the second spindle; the worm wheel of the worm gear mechanism is sleeved on the second spindle and has an internal thread, and the upper surface of the worm wheel abuts against the lower end of the first spindle; the worm of the worm gear mechanism is rotatably arranged on the valve body, and the end of the worm extending out of the valve body is connected to a manual rotating part.

[0014] A pilot-operated breathing valve, comprising:

[0015] a main valve having an internal communication port and a first external communication port; and

[0016] a pilot valve in communication with the internal chamber of the main valve;

[0017] Wherein, a diaphragm and a first valve flap abutting against the internal communication port are provided in the internal chamber of the main valve, and the above-mentioned breathing valve set pressure regulating device is provided between the diaphragm and the first valve flap.

[0018] Furthermore, a guide rod is connected above the diaphragm, and the guide rod is movably arranged in a fixed sleeve above the valve body; and the linear elastic element is sleeved on the outside of the guide rod.

[0019] Furthermore, an adjustment ring is embedded in the fixing sleeve, the adjustment ring is connected to the upper end of the linear elastic element, and the axial position of the adjustment ring in the fixing sleeve can be adjusted to compress or stretch the linear elastic element.

[0020] Furthermore, the internal chamber of the main valve is divided by the diaphragm into a space on one side communicating with the pilot valve and a space on the other side; the lifting structure is arranged outside the space on one side communicating with the pilot valve.

[0021] Furthermore, the pilot valve includes a main pilot valve and an emergency pilot valve; the second communicating chamber of the main pilot valve is connected to the internal chamber of the main valve; the third communicating chamber of the emergency pilot valve is connected to the second pressure regulating chamber of the main pilot valve, and the third pressure regulating chamber of the emergency pilot valve is connected to the interior of the container.

[0022] The beneficial effects of the utility model are:

[0023] 1. The regulating device of the utility model is provided with a coaxially coupled first and second spindles, and a linear elastic element is disposed between one end of the first spindle and the valve body of the pilot-operated breathing valve. The second spindle is connected to the first valve disc of the pilot-operated breathing valve. The lifting structure between the first and second spindles causes the pressure of the first spindle on the linear elastic element to change, thereby adjusting the set pressure controlled by one end of the first valve disc. This realizes the quick and convenient adjustment of the set pressure of the pilot-operated breathing valve without removing the diaphragm, thereby solving the problem of low regulation efficiency and wasteful damage to the diaphragm caused by the need to repeatedly adjust and disassemble the diaphragm when adjusting the set pressure of the pilot-operated breathing valve in the prior art.

[0024] 2. The pilot-operated breathing valve of the utility model is provided with a first spindle and a second spindle coupled coaxially, and a linear elastic element is provided between one end of the first spindle and the valve body of the pilot-operated breathing valve, so that the second spindle is connected to the first valve disc of the pilot-operated breathing valve. The lifting structure between the first spindle and the second spindle causes the pressure of the first spindle on the linear elastic element to change, thereby adjusting the set pressure controlled by one end of the first valve disc. This realizes the quick and convenient adjustment of the set pressure of the pilot-operated breathing valve without removing the diaphragm, thereby solving the problem of low adjustment efficiency and wasteful damage to the diaphragm caused by the need to repeatedly adjust and disassemble the diaphragm when adjusting the set pressure of the pilot-operated breathing valve in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0026] Figure 1 Structure diagram of the breathing valve of the present application embodiment 1;

[0027] Figure 2 Structure diagram of the present application Figure 1 Enlarged view of A;

[0028] Figure 3 Structure diagram of the adjusting device of the present application embodiment 2;

[0029] Figure 4 Structure diagram of the upper mandrel of the present application embodiment 3;

[0030] Figure 5 Structure diagram of the lower mandrel of the present application embodiment 3;

[0031] Figure 6 Structure diagram of the adjusting device of the present application embodiment 4;

[0032] Figure 7 Structure diagram of the main valve of the present application embodiment 5;

[0033] Figure 8 Structure diagram of the emergency pilot valve of the present application embodiment 5.

[0034] Reference signs: 100-main valve, 101-internal communication port, 102-first communication chamber, 103-first external communication port, 104-first pressure regulating chamber, 110-valve body, 112-fixed sleeve, 114-nut, 116-adjusting ring, 120-diaphragm, 122-diaphragm plate, 124-spring, 130-first mandrel, 140-second mandrel, 151-adjusting nut, 152-first insertion hole, 153-second insertion hole, 154-latch, 155-worm wheel, 156-worm, 157-hand wheel, 158-connection plate, 160-guide rod, 170-first valve flap, 180-baffle;

[0035] 200-main pilot valve, 202-second communication chamber, 203-second external communication port, 204-second pressure regulating chamber, 220-first sensing baffle, 230-third mandrel, 270-second valve flap;

[0036] 300 - emergency pilot valve, 302 - third communication chamber, 303 - third external communication port, 304 - third pressure regulating chamber, 320 - second sensing partition, 330 - fourth spindle, 370 - third valve disc;

[0037] 400 - communication pipe;

[0038] 500 - equalizing pipe. DETAILED DESCRIPTION

[0039] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0040] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples and the purpose is not to limit the present application.

[0041] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0042] Example 1

[0043] In the prior art, the pilot type breathing valve needs to adjust the size of the set pressure by adjusting the diaphragm to adapt to different containers and different media in the container or different external environments. However, the existing pilot type breathing valve adjusting diaphragm usually needs to disassemble the valve body and the partition plate, and due to the unevenness of the diaphragm, repeated position adjustment of the diaphragm is also required. This process is time-consuming and laborious, and the efficiency is low, and it will also cause waste of the diaphragm.

[0044] The present embodiment provides a breathing valve set pressure adjusting device for adjusting the size of the set pressure of the pilot type breathing valve. The breathing valve set pressure adjusting device can quickly and efficiently adjust the state of the diaphragm without disassembling the internal structure of the pilot type breathing valve, and adjust the size of the set pressure of the pilot type breathing valve. Please refer to Figure 1-Figure 2The pilot-operated breathing valve used in the regulating device of this embodiment mainly includes a main valve 100 and a pilot valve on the main valve 100. The internal chamber of the main valve 100 is divided into a first pressure regulating chamber 104 at the top and a first communicating chamber 102 at the bottom. A partition 180 is provided between the first pressure regulating chamber 104 and the first communicating chamber 102. A first valve disc 170 is provided in the first communicating chamber 102, which abuts against the internal communicating port 101. A diaphragm 120 is provided, dividing the first pressure-regulating chamber 104 into upper and lower compartments. The center of the diaphragm 120 is sandwiched between upper and lower diaphragm plates 122. The upper layer of the diaphragm plates 122 is connected to a guide rod 160, which is movably disposed within a fixed sleeve 112 above the valve body 110 of the main valve 100. The guide rod 160 can slide axially within the fixed sleeve 112. The breathing valve set pressure regulating device of this embodiment is disposed between the lower layer of the diaphragm plate 122 and the upper side of the first valve disc 170. The breathing valve set pressure regulating device primarily comprises a first spindle 130 and a second spindle 140.

[0045] The first spindle 130 is used to connect the regulating device with the upper diaphragm 122 and the valve body 110. Figure 1 As shown in the figure, the first mandrel 130 is roughly in the shape of a rod with a circular cross-section, and the upper part of the first mandrel 130 is passed through the center position of the diaphragm 122; the middle part of the first mandrel 130 is set through the partition 180 between the first pressure regulating chamber 104 and the first connecting chamber 102; the lower end center of the first mandrel 130 is open and extends a certain distance into the interior of the first mandrel 130.

[0046] The second spindle 140 is roughly rod-shaped with a circular cross section and is coaxial with the first spindle 130 . The upper portion of the second spindle 140 is coupled to the lower portion of the first spindle 130 . The second spindle 140 is used to connect the regulating device and the first valve flap 170 below. In this embodiment, the lower part of the second spindle 140 is embedded in the center position of the upper surface of the first valve disc 170; the upper part of the second spindle 140 is provided with an external thread, and is inserted into the central opening of the lower end of the first spindle 130, and an adjusting nut 151 is sleeved on the upper part of the second spindle 140, and the adjusting nut 151 is engaged with the external thread on the second spindle 140, and the diameter of the second spindle 140 is smaller than the diameter of the first spindle 130, so that the upper surface of the adjusting nut 151 abuts against the lower end of the first spindle 130, so that when the adjusting nut 151 is rotated, the position of the first spindle 130 relative to the second spindle 140 in the vertical direction (that is, the axial direction of the first spindle 130 and the second spindle 140) can be adjusted.

[0047] At the same time, in this embodiment, a spring 124 is provided between one end of the connection side between the first spindle 130 and the diaphragm 122 and the fixed sleeve 112 of the valve body 110, and the spring 124 is sleeved on the outside of the guide rod 160. At the same time, the guide rod 160 is coaxial with the second spindle 140 and the first spindle 130. Therefore, when the relative positions of the second spindle 140 and the first spindle 130 are adjusted, the spring 124 can be compressed or stretched axially under the guidance of the guide rod 160, thereby applying different amounts of pressure on the adjusting device.

[0048] A specific working method of this embodiment is:

[0049] When it is necessary to adjust the internal and external set pressures of the pilot breathing valve, there is no need to remove the partition 180 to open the first pressure regulating chamber 104. It is only necessary to rotate the adjusting nut 151 of the adjusting device in the first communicating chamber 102 connected to the outside to change the relative position of the second spindle 140 and the first spindle 130, and change the upper and lower spacing of the entire adjusting device; when the first valve disc 170 below abuts against the first external communicating port 103, the upper diaphragm 122 will move up and down; and then the upper spring 124 will be compressed or stretched axially under the guidance of the guide rod 160, and the dimension along the axial direction will change, thereby applying downward pressure of different sizes on the adjusting device; at the same time, the lower end of the adjusting device is connected to the first valve disc 170 that controls the connection and closing of the pilot breathing valve, so that the internal set pressure required for the internal and external communication of the pilot breathing valve is adjusted; that is, when the first spindle 130 is moved upward, the set pressure increases, and when the first spindle 130 is moved downward, the set pressure decreases.

[0050] In this embodiment, the breathing valve set pressure adjustment device is configured to connect the second spindle 140 to the first valve flap 170 of the pilot breathing valve by providing a coaxially coupled first spindle 130 and a second spindle 140, and providing a linear elastic element between one end of the first spindle 130 and the valve body 110 of the pilot breathing valve. The lifting structure between the first spindle 130 and the second spindle 140 is utilized to change the pressure of the first spindle 130 on the linear elastic element, thereby adjusting the set pressure controlled by one end of the first valve flap 170, thereby realizing quick and convenient adjustment of the set pressure of the pilot breathing valve without removing the diaphragm 120, thereby solving the problem in the prior art that the pilot breathing valve needs to repeatedly adjust and disassemble the diaphragm when adjusting the set pressure, resulting in low adjustment efficiency and wasteful damage to the diaphragm.

[0051] At the same time, the lifting structure of the breathing valve setting pressure regulating device in this embodiment is arranged outside the first pressure regulating chamber 104 below the partition 180, so that the lifting structure that requires manual operation is located outside the side space connected to the pilot valve separated by the diaphragm 120 in the first pressure regulating chamber 104, so that the uneven thickness defect of the diaphragm can be adapted through external adjustment without removing the diaphragm 120, thereby avoiding repeated disassembly and assembly to adjust the position of the diaphragm.

[0052] like Figure 2 As shown in , in this embodiment, an adjustment ring 116 is further embedded in the fixed sleeve 112. The adjustment ring 116 is annular and has a groove at the bottom. The adjustment ring 116 is sleeved on the outside of the guide rod 160 and connected to the upper end of the spring 124 through the groove. A nut 114 is also provided at the upper end of the fixed sleeve 112. At the same time, the axial position of the adjustment ring 116 in the fixed sleeve 112 is adjustable. When the adjustment range of the lifting structure between the first spindle 130 and the second spindle 140 is not suitable and the set pressure needs to be further increased or decreased, the nut 114 can be opened and the axial position of the adjustment ring 116 in the fixed sleeve 112 can be adjusted from above, thereby further compressing or stretching the spring 124, changing the pressure adjustment range of the spring 124, and adapting to the set pressure requirements in different situations.

[0053] In one or more other embodiments, the spring 124 in this embodiment may be replaced by a rubber spring, an air spring or other linear elastic element instead of a metal coil spring.

[0054] Example 2

[0055] On the basis of the first embodiment, a breathing valve set pressure regulating device with a different lifting structure is further proposed, and a second embodiment is provided below.

[0056] See also Figure 3 The lifting structure in the second embodiment mainly includes an external thread on the first spindle 130 and an adjusting nut 151. In this embodiment, the lower portion of the first spindle 130 is provided with an external thread, which is inserted into the central opening of the upper end of the second spindle 140, and the adjusting nut 151 is sleeved on the lower portion of the first spindle 130. The adjusting nut 151 engages with the external thread of the first spindle 130, and the diameter of the first spindle 130 is smaller than the diameter of the second spindle 140, so that the lower surface of the adjusting nut 151 abuts against the upper end of the second spindle 140, so that when the adjusting nut 151 is rotated, the position of the first spindle 130 relative to the second spindle 140 in the vertical direction (i.e., the axial direction of the first spindle 130 and the second spindle 140) can be adjusted.

[0057] Example 3

[0058] On the basis of the first embodiment, a breathing valve set pressure regulating device with a different lifting structure is further proposed, and a third embodiment is provided below.

[0059] See also Figure 4-Figure 5 The lifting structure in the third embodiment mainly includes a plurality of first insertion holes 152 on the first spindle 130, a plurality of second insertion holes 153 on the second spindle 140, and a latch 154. In this embodiment, a plurality of first insertion holes 152 are provided on the side surface of the first spindle 130 along the axial direction, and the first insertion holes 152 are provided through the first spindle 130; a plurality of second insertion holes 153 are provided on the side surface of the second spindle 140 along the axial direction, and the second insertion holes 153 are provided through the second spindle 140 and are aligned with the first insertion holes 152, and the second spindle 140 is inserted into the opening provided in the center of the lower end of the first spindle 130. At the same time, the pin 154 can be inserted into the first hole 152 and the second hole 153, so that the position of the first spindle 130 relative to the second spindle 140 in the vertical direction (that is, the axial direction of the first spindle 130 and the second spindle 140) can be adjusted by staggering the first hole 152 and the second hole 153 and fixing them through the pin 154.

[0060] Example 4

[0061] On the basis of the first embodiment, a breathing valve set pressure regulating device with a different lifting structure is further proposed, and a fourth embodiment is provided below.

[0062] See also Figure 6The lifting structure in the fourth embodiment mainly comprises external threads on the first spindle 130 and a worm gear mechanism composed of a worm wheel 155, a worm 156, a hand wheel 157 and connecting plates 158. In this embodiment, the upper part of the second spindle 140 is provided with external threads, which is inserted into the central opening at the lower end of the first spindle 130, and the worm wheel 155 is sleeved on the upper part of the second spindle 140. The worm wheel 155 has internal threads, which engages with the external threads on the second spindle 140, and the diameter of the second spindle 140 is smaller than that of the first spindle 130, so that the upper surface of the worm wheel 155 abuts against the lower end of the first spindle 130. Meanwhile, the worm 156 engages with the worm wheel 155, one end of the worm 156 extends out of the valve body 110 and is connected with the hand wheel 157, and the other end of the worm 156 extends into the first communicating chamber 102, and two connecting plates 158 are arranged on the side of the baffle 180 facing the first communicating chamber 102 for stabilizing the position of the worm 156. The worm 156 is rotatably connected with the valve body 110 and the two connecting plates 158 through bearings. Thus, the position of the first spindle 130 relative to the second spindle 140 in the vertical direction (i.e. the axial direction of the first spindle 130 and the second spindle 140) can be adjusted by rotating the hand wheel 157 outside the valve body 110 to drive the worm wheel 155 to rotate through the worm 156. The fourth embodiment has the advantage that the adjustment is made from outside the valve body 110, which is more convenient in operation. In one or more other embodiments, other hand-controlled rotating members can be used instead of the hand wheel 157.

[0063] Embodiment 5

[0064] On the basis of the above embodiments, a pilot-type breathing valve using the breathing valve set pressure adjusting device is further proposed, and the fifth embodiment is provided below.

[0065] Please refer to Figures 1-8 The pilot-type breathing valve in the fifth embodiment mainly comprises a main valve 100 and a pilot valve on the main valve 100. The internal chamber of the main valve 100 is divided into a first pressure adjusting chamber 104 at the upper part and a first communicating chamber 102 at the lower part. A baffle 180 is arranged between the first pressure adjusting chamber 104 and the first communicating chamber 102 at the lower part. A first valve disc 170 is arranged in the first communicating chamber 102 and abuts against the internal communicating port 101. A diaphragm 120 is arranged in the first pressure adjusting chamber 104 and divides the first pressure adjusting chamber 104 into two spaces at the upper and lower parts. The middle part of the diaphragm 120 is clamped by a double-layered diaphragm plate 122. The upper layer of the diaphragm plate 122 is connected with a guide rod 160, which is movably arranged in a fixed sleeve 112 above the valve body 110 of the main valve 100. The guide rod 160 can slide in the axial direction in the fixed sleeve 112. The breathing valve set pressure adjusting device in the above embodiments is arranged between the lower layer of the diaphragm plate 122 and the upper side of the first valve disc 170.

[0066] In this embodiment, the pilot-operated breathing valve is provided with a coaxially coupled first spindle 130 and a second spindle 140, and a linear elastic element is provided between one end of the first spindle 130 and the valve body 110 of the pilot-operated breathing valve, so as to connect the second spindle 140 with the first valve flap 170 of the pilot-operated breathing valve. By utilizing the lifting structure between the first spindle 130 and the second spindle 140, the pressure of the first spindle 130 on the linear elastic element is changed, thereby adjusting the set pressure controlled by one end of the first valve flap 170, and realizing quick and convenient adjustment of the set pressure of the pilot-operated breathing valve without removing the diaphragm 120, thereby solving the problem in the prior art that the pilot-operated breathing valve needs to repeatedly adjust and disassemble the diaphragm when adjusting the set pressure, resulting in low adjustment efficiency and waste of diaphragm.

[0067] Meanwhile, the pilot valve in this embodiment includes a main pilot valve 200 and an emergency pilot valve 300. Figure 7 、 Figure 8 As shown in FIG, the main pilot valve 200 communicates with the upper space of the diaphragm 120 within the first pressure regulating chamber 104, controlling the pressure within the upper space. The interior of the main pilot valve 200 is divided into an upper second pressure regulating chamber 204 and a lower second communication chamber 202. A second valve flap 270 is disposed within the second communication chamber 202. A first sensing diaphragm 220 is disposed within the second pressure regulating chamber 204, dividing the second pressure regulating chamber 204 into two upper and lower compartments. A third spindle 230 is connected between the first sensing diaphragm 220 and the second valve flap 270. Furthermore, a second external communication port 203 is provided on the side of the second communication chamber 202, communicating with the outside. The second pressure regulating chamber 204 is connected to the interior of the emergency pilot valve 300 via a connecting pipe 400. During use, when the internal pressure of the container is high, the pressure in the second pressure regulating chamber 204 increases, the first sensing diaphragm 220 will move upward, and then drive the second valve flap 270 to move upward through the third core shaft 230. After the second valve flap 270 moves upward, it will block the second pressure regulating chamber 204 and the second connecting chamber 202, and open the second external connecting port 203 below, so that the upper space of the diaphragm 120 in the first pressure regulating chamber 104 is connected to the outside, thereby generating a pressure difference on the upper and lower sides of the regulating device, but the area of ​​the diaphragm 120 at the top of the regulating device is larger than the area of ​​the first valve flap 170 at the bottom, and the downward pressure applied by the spring 124 causes the first valve flap 170 to not open immediately. When the internal pressure of the container exceeds the set pressure, the first valve flap 170 automatically opens to relieve pressure. By setting the main valve 200, a greater pressure can be applied to the first valve flap 170 under normal pressure sealing state, so that it is in close contact with the internal connecting port 101 without affecting the pressure relief performance of the breathing valve, thereby enhancing the sealing of the first valve flap 170 under normal pressure sealing state.

[0068] The interior of the emergency pilot valve 300 is divided into an upper third pressure-regulating chamber 304 and a lower third communication chamber 302. A third valve flap 370 is located within the third communication chamber 302. A second sensing diaphragm 320 is located within the third pressure-regulating chamber 304, dividing it into upper and lower compartments. A fourth spindle 330 is connected between the second sensing diaphragm 320 and the third valve flap 370. Furthermore, a third external communication port 303 is located at the bottom of the third communication chamber 302, connecting it to the outside. This port is connected to the second pressure-regulating chamber 204 within the main pilot valve 200 via a communication pipe 400. The third pressure-regulating chamber 304, in turn, is connected to the interior of the container via a pressure-equalizing pipe 500. During use, when the internal pressure of the container is high and the main valve 200 fails and does not work in time, the pressure in the third pressure regulating chamber 304 increases to a certain value, the second sensing diaphragm 320 will move upward, and then drive the third valve flap 370 upward through the fourth spindle 330. After the third valve flap 370 moves upward, it will block the third pressure regulating chamber 304 and the third connecting chamber 302, and open the third external connecting port 303 below, so that the upper space of the diaphragm 120 in the first pressure regulating chamber 104 is connected to the outside, thereby generating a pressure difference between the upper and lower sides of the regulating device. When the internal pressure of the container exceeds the set pressure, the first valve flap 170 automatically opens to release the pressure. By providing the emergency pilot valve 300, the failure of the main valve 200 can be prevented, and the safety and stability of the pilot-operated breathing valve of this embodiment can be improved.

[0069] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A breathing valve set pressure regulating device, characterized in that: Include: A first spindle (130), one end of which is connected to the valve body (110) of the breathing valve via a linear elastic element; and A second spindle (140) is coaxially coupled to the first spindle (130), and the second spindle (140) is connected to the first valve flap (170) of the breathing valve; A lifting structure is provided at the coupling portion between the first spindle (130) and the second spindle (140), and the lifting structure is capable of adjusting the relative positions of the first spindle (130) and the second spindle (140) along the axial direction, so that the dimension of the linear elastic element along the axial direction changes, thereby changing the pressure of the first valve flap (170) acting on the internal communication port (101) of the breathing valve, thereby changing the set pressure of the breathing valve.

2. The breathing valve set pressure regulating device according to claim 1, characterized in that: The second spindle (140) is inserted into the lower end opening of the first spindle (130); the lifting structure includes an external thread on the upper part of the second spindle (140) and an adjusting nut (151) arranged outside the second spindle (140), and the upper surface of the adjusting nut (151) abuts against the lower end of the first spindle (130).

3. The breathing valve set pressure regulating device according to claim 1, characterized in that: The first spindle (130) is inserted into the upper end opening of the second spindle (140); the lifting structure includes an external thread on the lower part of the first spindle (130) and an adjusting nut (151) arranged outside the first spindle (130), and the lower surface of the adjusting nut (151) abuts against the upper end of the second spindle (140).

4. The breathing valve set pressure regulating device according to claim 1, characterized in that: The second spindle (140) is inserted into the lower end opening of the first spindle (130); the lifting structure includes a plurality of first plug holes (152) on the first spindle (130) and a plurality of second plug holes (153) on the second spindle (140), and a pin (154) that can be inserted into the first plug holes (152) and the second plug holes (153).

5. The breathing valve set pressure regulating device according to claim 1, characterized in that: The second spindle (140) is inserted into the lower end opening of the first spindle (130); the lifting structure includes an external thread on the upper part of the second spindle (140) and a worm gear mechanism; the worm wheel (155) of the worm gear mechanism is sleeved on the second spindle (140) and has an internal thread, and the upper surface of the worm wheel (155) abuts against the lower end of the first spindle (130); the worm (156) of the worm gear mechanism is rotatably set on the valve body (110), and the end of the worm (156) extending outside the valve body (110) is connected to a manually controlled rotating part.

6. A pilot-operated breathing valve, characterized in that: Include: A main valve (100) having an internal communication port (101) and a first external communication port (103); and a pilot valve in communication with an internal chamber of the main valve (100); A diaphragm (120) and a first valve flap (170) abutting against the internal communication port (101) are provided in the internal chamber of the main valve (100), and a breathing valve set pressure regulating device according to any one of claims 1 to 5 is provided between the diaphragm (120) and the first valve flap (170).

7. The pilot-operated breathing valve according to claim 6, characterized in that: A guide rod (160) is connected above the diaphragm (120), and the guide rod (160) is movably arranged in a fixed sleeve (112) above the valve body (110); and the linear elastic element is sleeved on the outside of the guide rod (160).

8. The pilot-operated breathing valve according to claim 7, characterized in that: An adjustment ring (116) is embedded in the fixing sleeve (112), the adjustment ring (116) is connected to the upper end of the linear elastic element, and the axial position of the adjustment ring (116) in the fixing sleeve (112) can be adjusted to compress or stretch the linear elastic element.

9. The pilot-operated breathing valve according to claim 6, characterized in that: The internal chamber of the main valve (100) is divided by the diaphragm (120) into a space on one side communicating with the pilot valve and a space on the other side; the lifting structure is arranged outside the space on one side communicating with the pilot valve.

10. The pilot-operated breathing valve according to claim 6, characterized in that: The pilot valve comprises a main pilot valve (200) and an emergency pilot valve (300); the second communicating chamber (202) of the main pilot valve (200) is communicated with the internal chamber of the main valve (100); the third communicating chamber (302) of the emergency pilot valve (300) is communicated with the second pressure regulating chamber (204) of the main pilot valve (200), and the third pressure regulating chamber (304) of the emergency pilot valve (300) is communicated with the interior of the container.

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