A multi-layer pneumatic pressure reducing valve

Abstract

2. The operative position of the cam face is regulated by the pressure relief valve, and ...

Description

Technical Field

[0001] The invention relates to the technical field of pressure reducing valves, in particular to a multi-layer pneumatic pressure reducing valve. Background Art

[0002] The pressure reducing valve is a valve that reduces the inlet pressure to a certain required outlet pressure through regulation, and automatically maintains a stable outlet pressure by relying on the energy of the medium itself. From the perspective of fluid mechanics, the pressure reducing valve is a throttling element with variable local resistance, that is, by changing the throttling area, the flow rate and the kinetic energy of the fluid are changed, resulting in different pressure losses, thereby achieving the purpose of reducing pressure. Then, by relying on the regulation of the control and regulation system, the fluctuation of the pressure behind the valve is balanced with the spring force, so that the pressure behind the valve remains constant within a certain error range.

[0003] At present, most traditional pressure reducing valves mainly control the pressure of the medium in the pressure reducing valve by the reaction force of the spring, and the reaction speed is slow. It can only generate reaction force after the force transmitted by the valve stem is deformed, and it cannot quickly adjust the pressure of the medium in the pressure reducing valve. In addition, the spring stores and releases the medium in the pressure reducing valve, and the pressure of the valve core controls the opening of the valve core and the valve seat to achieve the effect of reducing the pressure of the medium in the pressure reducing valve. Due to the unstable performance of the spring, it is easy to cause large fluctuations in the pressure after the traditional pressure reducing valve, and then the pressure reduction effect cannot be accurately controlled. In addition, it relies on the wrist to rotate the handle on the pressure reducing valve to control the pressure reducing valve, which is time-consuming and labor-intensive. It is also impossible to achieve accurate pressure reduction by relying on manual control of the pressure reducing valve. Although there are a small number of multi-layer valve body structures at present, their structure is relatively complex, and the processing and assembly process is complicated, which is not convenient for manufacturing, installation and later maintenance. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a multi-layer pneumatic pressure reducing valve which is simple to process and assemble and can effectively realize the precise control of pressure reducing effect.

[0005] In order to solve the above technical problems, the present invention is implemented by the following technical solutions: a multi-layer pneumatic pressure reducing valve, characterized in that it includes a detachably connected upper valve body and a lower valve body, a fluid actuating device, a pressure regulating device and a valve seat placed in the lower valve body;

[0006] The upper end of the upper valve body is provided with an inlet, the interior is a hollow structure and a transverse plate is provided in the cavity, a part of the cavity on the transverse plate is set as an upper valve cavity, a fluid actuator is built in the upper valve cavity, an upper shaft hole is provided at the lower part of the inlet to provide a stroke for the fluid actuator, and a lower shaft hole is provided at the center of the transverse plate for the lower end of the fluid actuator to pass through;

[0007] The fluid actuator has an air flow channel arranged along its axis in the middle, and its lower end cooperates with the valve seat. The valve seat is provided with a plurality of air vents, and the lower part of the air vents is connected to an outlet arranged on the lower valve body. Driven by the fluid provided by the pressure regulating device, the multi-layer structure of the fluid actuator is forced to move rapidly in the upper valve cavity to adjust the gap between the fluid actuator and the valve seat.

[0008] Preferably, the fluid actuating device comprises a valve stem vertically arranged in the middle of the upper valve body, a plurality of partitions alternately sleeved on the valve stem, and a plurality of valve plate assemblies;

[0009] A plurality of partitions are slidably connected to the valve stem and are confined in the upper valve cavity to divide the upper valve cavity into a plurality of mutually independent and sealed control cavities; each valve plate assembly is located in a control cavity and divides the control cavity into an upper control cavity and a lower control cavity;

[0010] The air flow channel is arranged inside the valve stem;

[0011] All upper control chambers are connected to each other, and all lower control chambers are connected to each other.

[0012] Preferably, the valve plate assembly comprises a support shaft cylinder centrally slidably sleeved on the piston rod, the outer side of the support shaft cylinder is fixedly connected to the sleeve disc, the support shaft cylinder is coaxial with the disc and a valve plate shaft hole is opened in the center of both for the valve stem to pass through, and a plurality of inner drainage grooves are opened on the inner wall of the valve plate shaft hole;

[0013] An upward protrusion is formed on one side of the disc away from the supporting shaft cylinder, and the protrusion extends into the inner drainage groove of the supporting shaft cylinder of the adjacent valve plate assembly to realize transmission connection.

[0014] Preferably, the partition comprises a middle support plate, a through hole for the valve stem to pass through is opened at the center of the middle support plate, and an outer edge plate body of the middle support plate protrudes upward and downward along the axial direction to form a lower support plate and an upper baffle plate respectively;

[0015] The upper baffle of the partition abuts against the lower support plate of the adjacent partition, and the support shaft cylinder of the valve plate assembly cooperates with the upper support cylinder of the adjacent valve plate assembly;

[0016] The partition is sleeved on the supporting shaft cylinder of the valve plate assembly, the upper baffle abuts against the bottom surface of the disc of the valve plate assembly, and an upper control chamber is formed between the outer surface of the partition and the valve plate assembly;

[0017] The outer side surface of the disk of another valve plate assembly located below and adjacent to the valve plate assembly is sealed against the inner side surface of the lower support plate, and a lower control chamber is formed between the inner surface of the partition plate and the other valve plate assembly;

[0018] The outer side of the lower support plate is provided with a plurality of external drainage grooves for connecting adjacent lower control chambers; adjacent upper control chambers are connected via internal drainage grooves.

[0019] Preferably, a lower abutment end is provided at one end of the valve stem, the diameter of the lower abutment end is larger than the diameter of the valve stem and matches with the lower shaft hole;

[0020] The other end of the valve stem is provided with a butt pressure ring and a connector connected to the valve stem. The butt pressure ring is sleeved on the valve stem and placed in the upper shaft hole. Multiple valve plate assemblies are confined between the butt pressure ring and the lower butt end through the connector.

[0021] Preferably, the upper valve body includes a main shell and an upper cover body, the upper cover body includes an integrally formed end cover, a first flange and a support tube structure arranged between the end cover and the first flange, the upper axial hole is placed in the support tube structure, the inlet is placed in the center of the first flange and passes through the support tube structure and is connected to the upper axial hole, and the end cover is connected and fixed to the edge of the main shell by bolt fasteners.

[0022] Preferably, an annular top support plate is vertically provided on the end face of the end cover close to the main shell, the outer side surface of the top support plate abuts against the inner wall of the main shell, the partition plate closest to one end of the end cover abuts against the top support plate, and the protrusion of the valve plate assembly closest to one end of the end cover abuts against the abutment ring.

[0023] Preferably, the connecting piece is a fastening nut threadedly sleeved on one end of the valve stem, and the fastening nut and / or the abutting pressure ring are penetrated through the upper shaft hole or in the upper valve cavity near the upper shaft hole and can slide relatively.

[0024] Preferably, the pressure regulating device includes an intake valve mouth and an intake duct which are interconnected. The intake duct is placed in the upper valve body and connects the lower control chamber in the upper valve chamber closest to the partition end with the outside of the lower valve body. The intake valve mouth is arranged on the wall of the lower valve body at the entrance of the intake duct.

[0025] Preferably, the valve seat is a disc-shaped structure, the air flow channel of the valve stem corresponds to the center of the valve seat, the upper and lower cavities of the valve seat are set as the lower valve cavity, the valve seat divides the lower valve cavity into an upper exhaust cavity and a lower exhaust cavity, the upper exhaust cavity and the lower exhaust cavity are connected through an air vent, the lower part of the lower exhaust cavity is connected to an outlet, a second flange is provided at the outlet, and the outlet corresponds to and is coaxial with the inlet.

[0026] Compared with the prior art, the present invention is beneficial in that:

[0027] 1. Multiple control chambers are formed by the combination of multiple valve plate assemblies and upper valve bodies. A valve plate assembly is arranged in each control chamber to form a valve plate monomer module. The valve plate assembly is fixedly connected to the valve stem. Gas is provided by a pressure regulating device. The valve plate assembly drives the valve stem to move in the control chamber under the gas pressure difference between the upper control chamber and the lower control chamber. The above structure realizes the modular design of the valve plate assembly. The number of valve plate assemblies can be increased or decreased as needed to flexibly meet the use requirements. Compared with the traditional pressure reducing valve that uses the reaction force of the spring on the medium to control the distance between the valve core and the valve stem, it is not affected by the use time, and its actual application performance is more stable and the pressure reducing effect is better. Moreover, the modular design of the valve plate can facilitate production and manufacturing, simplify the manufacturing process, and reduce the manufacturing cost.

[0028] Second, the air intake mode of the upper control chamber and the lower control chamber of multiple valve plate assemblies adopts a unique internal and external drainage mode, and the drainage structure is designed on the valve plate assembly, thereby saving space, reducing the complexity of the overall structure, reducing costs, and reducing the volume and weight of the overall structure;

[0029] Third, the pressure reduction effect is more precise. It only needs to pre-inject gas that is consistent with the required gas pressure after pressure reduction to accurately control the pressure of the medium after pressure reduction. Secondly, it adopts a multi-layer control chamber structure, and adjusts the distance between the valve stem and the valve seat through the combined force of multiple control chambers, which effectively improves the valve stem displacement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0031] The present invention is further described below in conjunction with the accompanying drawings:

[0032] Figure 1 is a bottom view of the present invention;

[0033] Figure 2 yes Figure 1 Sectional view along AA direction;

[0034] Figure 3 is a perspective view of a valve plate assembly of the present invention;

[0035] Figure 4 is a three-dimensional view of the valve plate assembly of the present invention from another perspective;

[0036] Figure 5 is a top view of the valve plate assembly of the present invention;

[0037] Figure 6 It is a perspective view of the partition of the present invention. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0040] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] As attached Figure 1-Figure 2A multi-layer pneumatic pressure reducing valve is shown, comprising a detachably connected upper valve body and a lower valve body 1, a fluid actuating device, a pressure regulating device and a valve seat 3 placed in the lower valve body 1; the upper end of the upper valve body is provided with an inlet 4, the interior is a hollow structure and a transverse plate 6 is provided in its cavity, the upper part of the cavity of the transverse plate 6 is set as an upper valve cavity, the fluid actuating device is built in the upper valve cavity, the lower part of the inlet 4 is provided with an upper axial hole 5 for providing a stroke for the fluid actuating device, and the center of the transverse plate 6 is provided with a lower axial hole for the lower end of the fluid actuating device to pass through; the middle part of the fluid actuating device is provided with an air flow channel 13 arranged along its axis, and the lower end cooperates with the valve seat, and the valve seat 3 is provided with a plurality of vents 14, the lower part of the vents 14 is connected to the outlet 11 arranged on the lower valve body 1, and the multi-layer structure of the fluid actuating device is driven by the fluid provided by the pressure regulating device to move rapidly in the upper valve cavity to adjust the gap between the fluid actuating device and the valve seat 3 to achieve pressure reduction, which is not affected by the use time and has more stable actual application performance.

[0044] In this embodiment, to facilitate installation and disassembly, the upper valve body includes a main shell 7 and an upper cover body, and the upper cover body includes an integrally formed end cover 8, a first flange 9, and a support tube structure 10 arranged between the end cover 8 and the first flange 9. The upper shaft hole 5 is placed in the support tube structure 10, and the inlet 4 is placed at the center of the first flange 9 and passes through the support tube structure 10 and is connected to the upper shaft hole 5. The end cover 8 is connected and fixed to the edge of the main shell 7 by bolt fasteners.

[0045] Furthermore, the fluid actuating device includes a valve stem 2 vertically arranged in the middle of the upper valve body, a plurality of partitions 18 alternately sleeved on the valve stem 2, and a plurality of valve plate assemblies 17; the plurality of partitions 18 are slidably connected to the valve stem 2 and are confined in the upper valve cavity to divide the upper valve cavity into a plurality of independent and sealed control cavities; each valve plate assembly 17 is located in a control cavity and divides the control cavity into an upper control cavity and a lower control cavity; all upper control cavities are connected to each other, and all lower control cavities are connected to each other; the air flow channel 13 is arranged inside the valve stem 2.

[0046] In this embodiment, the main shell 7 is set as a columnar structure, the cross plate 6 is placed in the middle of the main shell 7, the lower valve body 1 is set as a funnel-shaped structure and encloses a lower valve cavity with the cross plate 6, the lower part of the lower valve body 1 is provided with an air outlet 11 and a lower flange 12 is also provided at the air outlet 11, and the outlet of the air outlet 11 is located at the center of the lower flange 12; the air flow channel 13 of the valve stem 2 corresponds to the center of the valve seat, and the valve seat 3 divides the lower valve cavity into an upper exhaust cavity 15 and a lower exhaust cavity 16, the upper exhaust cavity 15 and the lower exhaust cavity 16 are connected through the vent 14, the lower part of the lower exhaust cavity 16 is connected to the outlet 11, and the outlet 11 corresponds to and is coaxial with the inlet 4, the valve seat 3 is placed in the lower valve body 1 and below the valve stem 2, the air flow first passes through the upper exhaust cavity 15, then flows out to the lower exhaust cavity 16 through the vent 14, and finally flows out through the air outlet 11.

[0047] In this embodiment, in order to facilitate the adjustment of the gas flow rate flowing out of the valve stem 2 into the lower valve cavity, the valve seat 3 is set to a disc-shaped structure, and the lower channel opening of the airflow channel 13 at the lower end of the valve stem 2 corresponds to the center of the valve seat 3 above and below, and a plurality of the air vents 14 are arranged on the periphery of the valve seat 3. Therefore, by adjusting the distance between the lower end of the valve stem 2 and the valve seat 3, the size of the gap between the outlet of the airflow channel 13 at the lower end of the valve stem 2 and the center of the valve seat 3 can be adjusted, thereby adjusting the flow rate flowing out of the airflow channel 13.

[0048] A plurality of the valve plate assemblies are placed in the upper valve cavity and are serially connected to the valve stem 2 in sequence, such as Figure 3-Figure 5 As shown, the valve plate assembly 17 includes a support shaft cylinder 172 that is centrally slidably sleeved on the piston rod, the outer side of the support shaft cylinder 172 is fixedly connected to the sleeve disc 171, the support shaft cylinder 172 is coaxial with the disc 171, and the centers of both are provided with a valve plate shaft hole 19 for the valve stem 2 to pass through, a plurality of inner drainage grooves 20 are provided on the inner wall of the valve plate shaft hole 19, and the air flow direction in the inner drainage grooves 20 is parallel to the hole axis of the valve plate shaft hole 19; an upward protrusion 173 is formed on the side of the disc 171 that is away from the support shaft cylinder 172, and an upper drainage port 21 corresponding to the inner drainage groove 20 is provided on the protrusion 173, so that when the valve plate assembly 17 is installed on the valve stem 2, the inner drainage groove A sealed inner drainage hole 22 is enclosed between 20 and the outer wall of the valve stem 2, and when multiple valve plate assemblies 17 are serially connected to the valve stem 2 in sequence, the lower end faces of the supporting shaft cylinders 172 of the two upper and lower adjacent valve plate assemblies 17 abut against the upper end faces of the protrusions 173, and the inner drainage grooves 20 on the adjacent valve plate assemblies correspond to each other, and the protrusions 173 extend into the inner drainage grooves 20 of the supporting shaft cylinders 172 of the adjacent valve plate assemblies to realize transmission connection, effectively draining the gas in the upper control chamber of the lower valve plate assembly through the inner drainage hole 22 and the upper drainage port 21 to the upper control chamber of the upper valve plate assembly, thereby realizing the mutual connection of the upper control chambers of multiple valve plate assemblies 17.

[0049] like Figure 6 As shown, the partition 18 includes a middle support plate 181, the center of which is provided with a through hole 23 for the valve stem 2 to pass through, and the outer edge of the middle support plate 181 protrudes upward and downward in the axial direction to form a lower support plate 182 and an upper baffle plate 183 respectively; the upper baffle plate 183 of the partition 18 abuts against the lower support plate 182 of the adjacent partition 18, and the support shaft cylinder 172 of the valve plate assembly 17 cooperates with the upper support cylinder 173 of the adjacent valve plate assembly 17; the partition 18 is sleeved on the valve plate assembly 17 On the supporting shaft cylinder 172, the upper baffle plate 183 abuts against the bottom surface of the disk 171 of the valve plate assembly 17, and an upper control chamber is formed between the outer surface of the partition 18 and the valve plate assembly 17; the outer side surface of the disk 171 of another valve plate assembly located below and adjacent to the valve plate assembly is sealed against the inner side surface of the lower support plate 182, and a lower control chamber is formed between the inner surface of the partition and the other valve plate assembly; the outer side of the lower support plate 182 is opened with a plurality of external drainage grooves 24 for connecting adjacent lower control chambers.

[0050] Furthermore, in order to press and fix multiple valve plate assemblies on the valve stem 2 and improve the stability during installation, a lower abutment end head 27 is provided at one end of the valve stem 2, and the diameter of the lower abutment end head 27 is larger than the diameter of the valve stem 2 and cooperates with the lower shaft hole; the other end of the valve stem 2 is provided with an abutment pressure ring 28 and a connecting piece connected to the valve stem, and the abutment pressure ring 28 is sleeved on the valve stem 2 and placed in the upper shaft hole 5, and multiple valve plate assemblies 17 are confined between the abutment pressure ring 28 and the lower abutment end head 27 through the connecting piece.

[0051] Furthermore, the connecting piece is a fastening nut 29 threadedly sleeved with one end of the valve stem 2, and the fastening nut 29 and / or the abutting pressure ring 28 are penetrated through the upper shaft hole 5 or in the upper valve cavity close to the upper shaft hole 5 and can slide relatively. When multiple valve plate assemblies are installed, the support shaft cylinder 172 of the lowest valve plate assembly is placed in the lower shaft hole and is in contact with the inner wall of the lower shaft hole. The lower end face of the support shaft cylinder 172 is in contact with the step surface between the lower abutment end head 27 and the valve stem 2. For the convenience of installation, an annular top support plate 30 is vertically provided on the end face of the end cover 8 close to the main shell 7. The outer side surface of the top support plate 30 is in contact with the inner wall of the main shell 7, the partition 18 closest to one end of the end cover 8 is in contact with the top support plate 30, and the protrusion 173 of the valve plate assembly 17 closest to one end of the end cover 8 is in contact with the abutment ring 28. Therefore, the space in the upper valve cavity can be fully utilized, space resources can be saved, the complexity of the overall structure can be reduced, the cost can be reduced, and the volume of the overall structure can be reduced.

[0052] Furthermore, the pressure regulating device includes an air intake valve nozzle 31 and an air intake duct 32 which are interconnected. The air intake duct 32 is placed in the upper valve body and connects the lower control chamber in the upper valve chamber closest to the end of the partition with the outside of the lower valve body 1. The air intake valve nozzle 31 is arranged on the wall of the lower valve body 1 at the entrance of the air intake duct 32. In order to improve the air intake effect, the outlet of the air intake duct 32 is arranged vertically toward the lower side plate surface of the valve plate assembly 17, and the air intake valve nozzle 31 is arranged as a controllable valve structure. In actual applications, it is necessary to pre-inject gas with the same pressure as the medium after passing through the pressure reducing valve in the construction requirements through the air intake valve nozzle 31.

[0053] like Figure 2 As shown, in order to improve the sealing effect, sealing rings (a, b, c, d, e, f) are embedded between the support shaft cylinder 172 of the lowermost valve plate assembly 17 and the inner wall of the through hole 23 of the partition 18, between the inner wall of the through hole 23 of the partition 18 and the outer wall of the support shaft cylinder 172 of the valve plate assembly 17, between the outer wall of the abutment pressure ring 28 and the inner wall of the upper shaft hole 5, between the top support plate 30 and the inner wall of the main shell 7, between the outer peripheral end surface of the valve plate assembly 17 and the inner side surface of the lower support plate of the partition 18, and between the inner wall of the abutment pressure ring 28 and the outer wall of the valve stem 2.

[0054] In practical applications, the overall structure of the present invention is installed in an external air flow pipeline, and the air inlet 4 and the air outlet 11 are respectively connected and fixed to the pipe orifice flange of the external pipeline through the upper flange 9 and the lower flange 12. Before the decompression work is performed, the gas having the same pressure as the medium after passing through the pressure reducing valve in the construction requirements is first filled in through the air inlet valve nozzle 31. The first injected gas will enter the lower control cavity of the valve plate assembly through the air inlet duct 32 and the external drainage hole 26 on the outside of the partition 18, respectively, and then a pressure difference is formed between the upper control cavity and the lower control cavity of the valve plate, and then the valve plate assembly 17 is pushed to drive the valve stem 2 to move upward, and then the control cavity in the external pipeline is opened. The valve is controlled and the pressure reducing process begins. The airflow in the external pipeline enters from the air inlet 4 of the pressure reducing valve, passes through the valve plate shaft hole 19 and the airflow channel 13 in the middle of the valve stem 2, and then flows out to the upper exhaust chamber 15 above the valve seat 3. At this time, a part of the gas in the upper exhaust chamber 15 enters the upper control chamber of its valve plate assembly from the inner drainage hole 22 of the lowest valve plate, and further enters the upper control chambers of multiple valve plate assemblies, while the other part of the gas enters the lower exhaust chamber 16 through the vent 14, and further flows to the air outlet 11 and is discharged from the pressure reducing valve to the external pipeline. Then, according to the gas pressure of the medium flow itself, the pressure reducing valve performs an automatic adjustment process.

[0055] During the automatic adjustment process of the pressure reducing valve, if the current medium flows through the pressure reducing valve and flows out into the upper exhaust chamber 15, the medium flow pressure is greater than the air flow pressure in the lower control chamber of the multiple valve plate assemblies, according to the above, the air flow in the upper control chamber of the multiple valve plate assemblies will push the multiple valve plate assemblies and the valve stem 2 to move downward together, thereby reducing the gap between the lower end of the valve stem 2 and the valve seat 3, and then reducing the flow rate of the medium flowing out into the upper exhaust chamber 14, thereby reducing the pressure of the medium flow flowing out into the upper exhaust chamber 14, until it flows out to the upper exhaust chamber. The pressure of the medium flow in 15 is equal to the pressure in the lower control chamber of the multiple valve plate assemblies, that is, the pressure in the upper control chamber of the multiple valve plate assemblies is equal to the pressure in the lower control chamber. At this time, the multiple valve plate assemblies will maintain a balanced static state and no longer move downward, so that a stable outflow gap is maintained between the lower end of the valve stem 2 and the valve seat 3. At this time, the pressure of the medium flow flowing out to the upper exhaust chamber 15 and the lower valve body outlet 11 is equal to the pressure of the medium after passing through the pressure reducing valve in the construction requirements, meeting the automatic adjustment of the pressure reduction requirements.

[0056] If the current medium flows through the pressure reducing valve and flows out to the upper exhaust chamber 15, and the medium flow pressure is lower than the air flow pressure in the lower control chamber of the multiple valve plate assemblies, the air flow in the lower control chamber of the multiple valve plate assemblies will push the multiple valve plate assemblies and the valve stem 2 to move upward together, thereby increasing the gap between the lower end of the valve stem 2 and the valve seat 3, and then increasing the flow rate of the medium flowing out to the lower valve body 1, thereby increasing the pressure of the medium flow flowing out to the upper exhaust chamber 15, until the pressure of the medium flow flowing out to the upper exhaust chamber 15 is equal to the pressure in the lower control chamber of the multiple valve plate assemblies, that is, the pressure in the upper control chamber of the multiple valve plate assemblies is equal to the pressure in the lower control chamber. At this time, the multiple valve plate assemblies will maintain a balanced and static state and no longer move upward, so that a stable outflow gap is maintained between the lower end of the valve stem 2 and the valve seat 3. At this time, the pressure of the medium flow flowing out to the upper exhaust chamber 15 and the lower valve body outlet 11 is equal to the pressure of the medium after passing through the pressure reducing valve in the construction requirements, meeting the automatic adjustment pressure reduction requirements.

[0057] After the above-mentioned automatic pressure reduction and adjustment process is completed, the pressure of the medium flow flowing out of the pressure reducing valve is equal to the required pressure of the medium flow. When it is necessary to adjust the pressure of the medium after flowing out of the pressure reducing valve, it is only necessary to pre-adjust the pressure value of the gas injected into the lower control cavity of the multiple valve plates before pressure reduction, and fill or extract the gas through the inlet valve nozzle 31. The pressure value is equal to the pressure of the medium after flowing out of the pressure reducing valve that needs to be adjusted, and the operation process is simple and quick.

[0058] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A multi-layer pneumatic pressure reducing valve, characterized in that: It includes a detachably connected upper valve body and a lower valve body, a fluid actuating device, a pressure regulating device, and a valve seat disposed in the lower valve body; The upper end of the upper valve body is provided with an inlet, the interior is a hollow structure and a transverse plate is provided in the cavity, a part of the cavity on the transverse plate is set as an upper valve cavity, a fluid actuator is built in the upper valve cavity, an upper shaft hole is provided at the lower part of the inlet to provide a stroke for the fluid actuator, and a lower shaft hole is provided at the center of the transverse plate for the lower end of the fluid actuator to pass through; The fluid actuator has an air flow channel arranged along its axis in the middle, and its lower end cooperates with the valve seat. The valve seat is provided with a plurality of air vents, and the lower part of the air vents is connected to an outlet arranged on the lower valve body. Driven by the fluid provided by the pressure regulating device, the multi-layer structure of the fluid actuator is forced to move rapidly in the upper valve cavity to adjust the gap between the fluid actuator and the valve seat.

2. A multi-layer pneumatic pressure reducing valve according to claim 1, characterized in that: The fluid actuating device comprises a valve stem vertically arranged in the middle of the upper valve body, a plurality of partitions alternately sleeved on the valve stem, and a plurality of valve plate assemblies; A plurality of partitions are slidably connected to the valve stem and are confined in the upper valve cavity to divide the upper valve cavity into a plurality of mutually independent and sealed control cavities; each valve plate assembly is located in a control cavity and divides the control cavity into an upper control cavity and a lower control cavity; The air flow channel is arranged inside the valve stem; All upper control chambers are connected to each other, and all lower control chambers are connected to each other.

3. A multi-layer pneumatic pressure reducing valve according to claim 2, characterized in that: The valve plate assembly comprises a support shaft cylinder centrally slidably sleeved on the piston rod, the outer side of the support shaft cylinder is fixedly connected to the sleeve disc, the support shaft cylinder is coaxial with the disc and a valve plate shaft hole is opened in the center of both for the valve stem to pass through, and a plurality of inner drainage grooves are opened on the inner wall of the valve plate shaft hole; An upward protrusion is formed on one side of the disc away from the supporting shaft cylinder, and the protrusion extends into the inner drainage groove of the supporting shaft cylinder of the adjacent valve plate assembly to realize transmission connection.

4. A multi-layer pneumatic pressure reducing valve according to claim 3, characterized in that: The partition plate comprises a middle support plate, a through hole for the valve stem to pass through is opened in the center of the middle support plate, and the outer edge plate body of the middle support plate protrudes upward and downward in the axial direction to form a lower support plate and an upper baffle plate respectively; The upper baffle of the partition abuts against the lower support plate of the adjacent partition, and the support shaft cylinder of the valve plate assembly cooperates with the upper support cylinder of the adjacent valve plate assembly; The partition is sleeved on the supporting shaft cylinder of the valve plate assembly, the upper baffle abuts against the bottom surface of the disc of the valve plate assembly, and an upper control chamber is formed between the outer surface of the partition and the valve plate assembly; The outer side surface of the disk of another valve plate assembly located below and adjacent to the valve plate assembly is sealed against the inner side surface of the lower support plate, and a lower control chamber is formed between the inner surface of the partition plate and the other valve plate assembly; The outer side of the lower support plate is provided with a plurality of external drainage grooves for connecting adjacent lower control chambers; adjacent upper control chambers are connected via internal drainage grooves.

5. A multi-layer pneumatic pressure reducing valve according to claim 3, characterized in that: A lower abutment end is provided at one end of the valve stem, the diameter of the lower abutment end is larger than the diameter of the valve stem and matches with the lower shaft hole; The other end of the valve stem is provided with a butt pressure ring and a connector connected to the valve stem. The butt pressure ring is sleeved on the valve stem and placed in the upper shaft hole. Multiple valve plate assemblies are confined between the butt pressure ring and the lower butt end through the connector.

6. A multi-layer pneumatic pressure reducing valve according to claim 4, characterized in that: The upper valve body includes a main shell and an upper cover body, and the upper cover body includes an integrally formed end cover, a first flange plate, and a support tube structure arranged between the end cover and the first flange plate. The upper shaft hole is placed in the support tube structure, and the inlet is placed in the center of the first flange plate and passes through the support tube structure and is connected to the upper shaft hole. The end cover is connected and fixed to the edge of the main shell by bolt fasteners.

7. A multi-layer pneumatic pressure reducing valve according to claim 6, characterized in that: An annular top support plate is vertically provided on the end face of the end cover close to the main shell, the outer side surface of the top support plate abuts against the inner wall of the main shell, the partition closest to one end of the end cover abuts against the top support plate, and the protrusion of the valve plate assembly closest to one end of the end cover abuts against the abutment ring.

8. The multi-layer pneumatic pressure reducing valve according to claim 5, characterized in that: The connecting piece is a fastening nut threadedly sleeved with one end of the valve stem. The fastening nut and / or the abutting pressure ring are inserted into the upper shaft hole or in the upper valve cavity close to the upper shaft hole and can slide relatively.

9. A multi-layer pneumatic pressure reducing valve according to claim 2, characterized in that: The pressure regulating device includes an intake valve mouth and an intake duct which are interconnected. The intake duct is placed in the upper valve body and connects the lower control chamber in the upper valve chamber closest to the partition plate with the outside of the lower valve body. The intake valve mouth is arranged on the wall of the lower valve body at the entrance of the intake duct.

10. A multi-layer pneumatic pressure reducing valve according to any one of claims 2 to 9, characterized in that: The valve seat is a disc-shaped structure, the air flow channel of the valve stem corresponds to the center of the valve seat, the upper and lower cavities of the valve seat are set as the lower valve cavity, the valve seat divides the lower valve cavity into an upper exhaust cavity and a lower exhaust cavity, the upper exhaust cavity and the lower exhaust cavity are connected through an air vent, the lower part of the lower exhaust cavity is connected to the outlet, a second flange is provided at the outlet, and the outlet corresponds to and is coaxial with the inlet.

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