CN112682548A - Pressure reducing valve and pressure regulating method thereof - Google Patents
Pressure reducing valve and pressure regulating method thereof Download PDFInfo
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- CN112682548A CN112682548A CN202011317087.7A CN202011317087A CN112682548A CN 112682548 A CN112682548 A CN 112682548A CN 202011317087 A CN202011317087 A CN 202011317087A CN 112682548 A CN112682548 A CN 112682548A
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Abstract
The invention discloses a pressure reducing valve and a pressure regulating method thereof, wherein the pressure reducing valve comprises a shell, a pretightening force regulating mechanism, a pressure sensitive regulating mechanism and a valve core assembly are sequentially arranged in the shell from top to bottom, the pretightening force regulating mechanism acts on the pressure sensitive regulating mechanism and regulates the acting force between the pressure sensitive regulating mechanism and the valve core assembly, a safety pressure relief device is arranged in the pressure sensitive regulating mechanism, and the safety pressure relief device is communicated with an outlet cavity formed by the valve core assembly and the shell. According to the invention, through reasonably designing the flow channel, the structure of the pressure reducing valve is more compact, so that the purposes of reducing the product volume and improving the system integration level are realized. The valve core assembly is integrally designed, the assembly can be detached and replaced independently, the assembly is convenient, and the production speed and the assembly quality of products can be improved. The valve core port is designed with a damping ring, and the function of adjusting response speed and dynamic and static pressure difference adjusting precision is realized through proper clearance fit adjustment.
Description
Technical Field
The invention relates to the technical field of pressure reducing valves, in particular to a pressure reducing valve for a breathing machine and a pressure regulating method thereof.
Background
The pressure reducing valve is a pneumatic component for throttling and reducing the pressure of an inlet air source to a target pressure and supplying the pressure to a system, and the stability and the service performance of the system are directly influenced by the pressure reducing and stabilizing functions of the pneumatic component. The pressure reducing valve is divided into a direct-acting structure and a pilot-operated structure according to the structure, and the structure size of the pressure reducing valve is generally designed according to the flow rate and the pressure range of a system.
The pressure reducing valve for the respirator is high in required adjusting precision and static and dynamic stability, has wide pressure range adjusting capacity, can be manually adjusted, and is small in required size, convenient to detach and the like due to structural limitation of the respirator. The conventional pressure reducing valve is limited by the structure, is large in size, inconvenient to replace, poor in pressure stabilizing effect and capable of bringing certain potential safety hazards, and the pressure reducing valve used for the breathing machine is designed to be necessary for solving the problem that the conventional pressure reducing valve is limited by the application of the pressure reducing valve to the breathing machine.
Disclosure of Invention
In view of the above-mentioned shortcomings in the background art, the present invention provides a pressure reducing valve and a pressure regulating method thereof, so as to solve the above-mentioned technical problems.
The technical scheme of the invention is realized as follows: a pressure reducing valve comprises a shell, wherein a pretightening force adjusting mechanism, a pressure sensitive adjusting mechanism and a valve core assembly are sequentially arranged in the shell from top to bottom, the pretightening force adjusting mechanism acts on the pressure sensitive adjusting mechanism and adjusts the acting force between the pressure sensitive adjusting mechanism and the valve core assembly, a safety pressure relief device is arranged in the pressure sensitive adjusting mechanism, and the safety pressure relief device is communicated with an outlet cavity formed by the valve core assembly and the shell.
The pretightening force adjusting mechanism comprises a handle in threaded connection with the shell, a knob is fixedly arranged on the upper portion of the handle, the handle extends downwards into the shell, a first spring seat is fixedly arranged on the handle, and a pretightening spring is arranged between the first spring seat and the pressure sensitive adjusting mechanism.
The pressure sensitive adjusting mechanism comprises a partition plate seat which is fixed in the shell in a sealing way, a low-pressure sensitive element is arranged on the partition plate seat, a pre-tightening spring of the pre-tightening force adjusting mechanism acts on the low-pressure sensitive element, and a low-pressure sensitive cavity is formed between the low-pressure sensitive element and the partition plate seat; and a low-pressure drainage channel is arranged on the partition plate seat and communicates the outlet cavity with the low-pressure sensitive cavity.
The low-pressure sensitive element comprises a diaphragm seat and a diaphragm, the diaphragm is sleeved on the diaphragm seat and is fixedly pressed on the diaphragm seat through a pressing plate, and the outer edge of the diaphragm is fixedly pressed between the shell and the partition plate seat.
The diaphragm position flexible diaphragm is provided with gaps for the flexible diaphragm to deform between the diaphragm seat and the shell and between the pressing plate and the shell, and the bottom of the diaphragm seat is provided with a pressure relief opening.
The safety pressure relief device comprises a fixed valve seat fixed on the upper portion of the diaphragm seat in a sealing mode, an ejector pin valve core and a first spring are arranged in the fixed valve seat, the ejector pin valve core is matched with a valve port formed in the upper portion of the fixed valve seat and corresponds to an adjusting screw arranged on the pretightening force adjusting mechanism, the adjusting screw is located above the ejector pin valve core, an elastic sealing ring is arranged between the ejector pin valve core and the fixed valve seat, and the first spring is located between the ejector pin valve core and the diaphragm seat.
The valve core assembly comprises a valve core seat fixed inside the shell, a second spring seat and a valve core are arranged inside the valve core seat, a damping ring is arranged on the upper portion of the valve core seat, the valve core extends upwards out of the damping ring and corresponds to the pressure sensitive adjusting mechanism, the lower portion of the valve core is located inside the second spring seat, a sealed unloading cavity is formed between the valve core and the second spring seat, a reset elastic piece is arranged in the unloading cavity, and the valve core is matched with the valve core seat and the second spring seat to form a pressure reducing valve port.
The pressure reducing valve port is communicated with an inlet arranged on the shell, and the outlet cavity corresponds to an outlet arranged on the shell; a Y-shaped sealing ring is arranged between the valve core and the second spring seat, the reset elastic part is a reset spring, and the reset spring is positioned between the valve core and the second spring seat; and a drainage hole is arranged in the valve core, one end of the drainage hole is communicated with the outlet cavity, and the other end of the drainage hole is communicated with the unloading cavity.
The shell comprises an upper shell and a lower shell which are connected in a sealing mode, the pretightening force adjusting mechanism is arranged in the upper shell, the valve core assembly is arranged in the lower shell, and the pressure sensitive adjusting mechanism is arranged at the connecting position of the upper shell and the lower shell.
A pressure regulating method of a pressure reducing valve comprises a pressure reducing method, a pressure stabilizing method and a pressure relieving method; the pressure reduction method specifically comprises the following steps: the handle of the pretightening force adjusting mechanism is rotated to adjust the compression amount of the pretightening force spring, so as to adjust the pretightening force acting on the diaphragm adjusted by the pressure sensitive adjusting mechanism, and further the pressure applied to the valve core of the valve core assembly, thereby realizing the adjustment of the outlet pressure;
the voltage stabilizing method comprises the following specific steps: the low-pressure drainage channel of the pressure sensitive adjusting mechanism drains the fluid at the outlet to the low-pressure sensitive cavity to form an upward low-pressure feedback force to the diaphragm, the downward spring force applied by the pre-tightening spring is applied to the upper part of the diaphragm, the low-pressure feedback force and the spring force form dynamic balance, and the balance force is transmitted to the valve core of the valve core assembly; when the outlet pressure is reduced, the pressure in the pressure sensitive cavity is reduced, the low-pressure feedback force is reduced, and after the dynamic balance is broken, the valve core moves downwards, so that the opening degree of a valve port between the valve core and the valve core seat is increased, and the outlet pressure is increased; when the outlet pressure is increased, the pressure in the pressure sensitive cavity is increased, the low-pressure feedback force is increased, and after the dynamic balance is broken, the valve core moves upwards, so that the opening degree of a valve port between the valve core and the valve core seat is reduced, and the outlet pressure is reduced; thereby achieving the purpose of voltage stabilization;
the pressure relief method comprises the following specific steps: when the pressure of the outlet suddenly increases and breaks through the safe pressure, the pressure in the low-pressure sensitive cavity increases, the diaphragm is pushed to move upwards, the safe pressure relief device moves upwards, the ejector pin valve core of the safe pressure relief device touches the adjusting screw and then moves downwards, so that the valve port between the fixed valve seat and the ejector pin valve core is opened, the pressure at the outlet is released through the safe pressure relief device, and the purpose of pressure relief is achieved.
According to the invention, through reasonably designing the flow channel, the structure of the pressure reducing valve is more compact, so that the purposes of reducing the product volume and improving the system integration level are realized. The valve core assembly is integrally designed, the assembly can be detached and replaced independently, the assembly is convenient, and the production speed and the assembly quality of products can be improved. The valve core port is designed with a damping ring, and the function of adjusting response speed and dynamic and static pressure difference adjusting precision is realized through proper clearance fit adjustment. The pressure sensitive element is provided with a safety pressure relief device, and when the outlet pressure is increased steeply, the outlet pressure can be released to the air through the safety pressure relief device, so that the working system is prevented from being damaged by impact, and the safety is improved.
Drawings
In order to illustrate the embodiments of the invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the invention, and that other drawings may be derived from those drawings by a person skilled in the art without inventive effort.
FIG. 1 is a schematic front view of the present invention.
FIG. 2 is a schematic top view of the present invention.
Fig. 3 is a view from a-a in fig. 2.
Fig. 4 is a schematic structural diagram of a pressure-sensitive adjusting mechanism.
Fig. 5 is a schematic structural view of the valve core assembly.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1 and 2, in embodiment 1, a pressure reducing valve includes a housing, in which a pre-tightening force adjusting mechanism, a pressure sensitive adjusting mechanism, and a valve core assembly are sequentially disposed from top to bottom, and the pre-tightening force adjusting mechanism acts on the pressure sensitive adjusting mechanism and adjusts an acting force between the pressure sensitive adjusting mechanism and the valve core assembly. The pressure sensitive adjusting mechanism is characterized in that a safe pressure relief device is arranged inside the pressure sensitive adjusting mechanism and used for releasing sudden high pressure, so that the working system is prevented from being damaged by impact, and the safety is improved. The safety relief device is in communication with an outlet chamber 26 formed by the spool assembly and the housing for directly relieving outlet discharge pressure. The pre-tightening force adjusting mechanism, the pressure sensitive adjusting mechanism and the valve core assembly are designed in a blocking mode, the assembly can be detached and replaced independently, assembly is convenient, and production speed and assembly quality of products can be improved. Preferably, the housing comprises an upper housing 2 and a lower housing 1 which are in sealing connection, the pretightening force adjusting mechanism is arranged in the upper housing 2, the valve core assembly is arranged in the lower housing 1, and the pressure sensitive adjusting mechanism is arranged at the connection part of the upper housing 2 and the lower housing 1, so that the sealing performance of the housing is improved.
Further, as shown in fig. 3, the pretightening force adjusting mechanism includes a handle 5 in threaded connection with the housing, a knob 4 is fixedly arranged on the upper portion of the handle 5, and the handle moves up and down in the upper housing by rotating the knob. The handle 5 extends downwards into the shell, a first spring seat 6 is fixedly arranged on the handle 5, a pre-tightening spring 3 is arranged between the first spring seat 6 and the pressure sensitive adjusting mechanism, and the pre-tightening spring is sleeved on the handle and acts on a pressure plate of the pressure sensitive adjusting mechanism. The handle is rotated through the knob, the pretightening force of the pretightening spring acting on the pressing plate is adjusted, the acting force received by the valve core assembly is adjusted, and then the outlet pressure is adjusted. The pressure reducing valve shell and the adjusting handle are both designed to be of plastic structures, and can be formed through injection molding, so that the batch production of the pressure reducing valve is facilitated.
As shown in fig. 4, in embodiment 2, the pressure-sensitive adjusting mechanism includes a partition plate seat 13 fixed in the housing in a sealing manner, the partition plate seat 13 is fixed at the upper end of the lower housing 2, and a third sealing ring 23 is arranged between the partition plate seat and the lower housing, a low-pressure sensitive element is arranged on the partition plate seat 13, a preload spring 3 of the preload adjusting mechanism acts on the low-pressure sensitive element, the low-pressure sensitive element contacts with a valve element of the valve element assembly, and the preload adjusting mechanism adjusts an acting force received by the valve element through the low-pressure sensitive element. A low-pressure sensitive cavity 27 is formed between the low-pressure sensitive element and the partition plate seat 13; the partition plate seat 13 is provided with a low-pressure drainage channel 30, and the outlet cavity 26 and the low-pressure sensitive cavity 27 are communicated by the low-pressure drainage channel 30 to form a similar communicating vessel structure, so that the outlet pressure can be accurately and quickly adjusted. The lower part of the diaphragm forms a low-pressure sensitive cavity, the low-pressure drainage tube drains fluid at an outlet to the low-pressure sensitive cavity to form upward low-pressure feedback force, the upper part of the diaphragm is subjected to spring force applied by a pre-tightening spring, the low-pressure sensitive cavity and the pre-tightening spring form dynamic balance, balance force is transmitted to the valve core through a rod of the valve core, when the outlet pressure is reduced, the pressure of the pressure sensitive cavity is reduced, and after the dynamic balance is broken, downward force is applied to the valve core to increase the opening degree of the valve core and improve the outlet pressure, or vice versa, so that the function of stabilizing.
Further, the low-pressure sensitive element comprises a diaphragm seat 11 and a diaphragm 12, the diaphragm seat 11 is located at the upper part of the partition plate seat, the diaphragm 12 is sleeved on the diaphragm seat 11 and is pressed and fixed on the diaphragm seat 11 through a pressure plate 10, and the outer edge of the diaphragm 12 is pressed and fixed between the shell and the partition plate seat 13. The main function is to dynamically balance the performance of the main spring force and the feedback force of the low-pressure cavity and transmit the resultant force to the valve core, thereby realizing the function of stabilizing the outlet pressure. Preferably, a gap for the deformation of the flexible diaphragm is arranged between the diaphragm seat 11 and the shell and between the pressure plate 10 and the shell, so that a certain pressurizing effect is achieved. The bottom of the diaphragm seat 11 is provided with a pressure relief port 35 through which fluid in the low-pressure sensitive cavity enters the safety pressure relief device and is safely relieved by the safety pressure relief device.
Further, the safety pressure relief device comprises a fixed valve seat 9 fixed on the upper portion of the diaphragm seat 11 in a sealing mode, the fixed valve seat 9 is in threaded connection with the diaphragm seat 11, an ejector pin valve core 8 and a first spring 14 are arranged in the fixed valve seat 9, the ejector pin valve core 8 is matched with a valve port arranged on the upper portion of the fixed valve seat 9, the ejector pin valve core 8 corresponds to an adjusting screw 7 arranged on the pretightening force adjusting mechanism, the ejector pin valve core 8 moves downwards after touching the adjusting screw in the upward movement process of the fixed valve seat, and the valve port is opened. The adjusting screw 7 is positioned above the thimble valve core 8, so that the thimble valve core can correctly touch the adjusting screw. The adjusting screw can be connected to the lower end of the handle 5 in a threaded mode, and the length of the adjusting screw extending out of the handle is adjustable. The handle 5 is arranged coaxially with the thimble valve core. An elastic sealing ring 21 is arranged between the thimble valve core 8 and the fixed valve seat 9, so that the sealing performance between the thimble valve core 8 and the fixed valve seat in a valve port closed state is improved. The first spring 14 is located between the thimble valve core 8 and the diaphragm seat 11, and is used for resetting the thimble valve core. When the pressure of the outlet suddenly increases to break through the safe pressure, the pressure of the low-pressure sensitive cavity increases to push the diaphragm to move upwards, so that the safe pressure relief device upwards touches the adjusting screw, the valve port of the safe pressure relief device is opened, the pressure of the outlet is released through the pressure relief device, and the system behind the pressure relief valve is prevented from being damaged due to high pressure.
The other structure is the same as embodiment 1.
As shown in fig. 5, in embodiment 3, the valve core assembly of the pressure reducing valve includes a valve core seat 15 fixed inside the housing, a fourth sealing ring 24 is disposed between the valve core seat and the partition plate seat, and a fifth sealing ring 25 is disposed between the valve core seat and the housing. The inside of the valve core seat 15 is provided with a second spring seat 16 and a valve core 18, the second spring seat 16 is in threaded connection with the valve core seat, so that the valve core seat is convenient to disassemble and assemble, and a second sealing ring 22 is arranged between the second spring seat and the valve core seat. The upper part of the valve core seat 15 is provided with a damping ring 29, and the valve core 18 extends upwards out of the damping ring 29 and corresponds to the pressure sensitive adjusting mechanism. The damping ring 29 is a plastic damping hole, a guide rod of the valve core is inserted into the damping hole, a rubber sealing surface of the valve core and a metal R surface of the valve core seat form a reliable soft-hard sealing pair structure, the plastic damping hole and the guide rod of the valve core are in clearance fit, the valve core can freely move in the damping hole and has certain sealing capacity, a fluid loop is prevented from being formed with a low-pressure sensitive cavity, and the dynamic and static pressure difference performance of the pressure reducing valve is improved. The lower part of the valve core 18 is positioned in the second spring seat 16, a sealed unloading cavity 28 is formed between the valve core 18 and the second spring seat 16, a reset elastic part is arranged in the unloading cavity 28, the valve core 18 is matched with the valve core seat 15 and the second spring seat 16 to form a pressure reduction valve port 34, a gap is reserved between the valve core 18 and the valve core seat 15, and the pressure reduction purpose is realized.
Preferably, the pressure relief valve port 34 is communicated with an inlet 32 provided on the housing, and the outlet chamber 26 is corresponding to an outlet 33 provided on the housing; fluid (gas) enters the valve core assembly through the inlet, is discharged through the outlet after being decompressed, and realizes high-pressure inlet and low-pressure outlet. A Y-shaped sealing ring 20 is arranged between the valve core 18 and the second spring seat 16 to improve the sealing property between the valve core 18 and the second spring seat 16, the reset elastic part is a reset spring 17, and the reset spring 17 is positioned between the valve core 18 and the second spring seat 16; a drainage hole 31 is arranged in the valve core 18, one end of the drainage hole 31 is communicated with the outlet cavity 26, and the other end of the drainage hole 31 is communicated with the unloading cavity 28. The lower end of the valve core is inserted into the second spring seat and matched with the second spring seat through the Y-shaped sealing ring, the lower end of the valve core is pressed on the reset spring to form an unloading cavity, the valve core is provided with a drainage hole, and a medium decompressed through the valve port is drained to the unloading cavity at the lower end of the valve core through the drainage hole, so that the upper end load acting on the valve core is offset, and the dynamic pressure stabilizing precision of the pressure reducing valve is improved. When the reducing valve is damaged due to long-term work or accident, the valve core assembly can be directly replaced, the whole reducing valve is prevented from being disassembled, and the usability of the reducing valve is improved.
The other structure is the same as embodiment 2.
Example 4: a method of regulating pressure of a pressure reducing valve according to embodiment 3, including a pressure reducing method, a pressure stabilizing method, and a pressure releasing method; the pressure reduction method specifically comprises the following steps: the handle of the pretightening force adjusting mechanism is rotated to adjust the compression amount of the pretightening force spring, so as to adjust the pretightening force acting on the diaphragm adjusted by the pressure sensitive adjusting mechanism, and further the pressure applied to the valve core of the valve core assembly, thereby realizing the adjustment of the outlet pressure;
the voltage stabilizing method comprises the following specific steps: the low-pressure drainage channel of the pressure sensitive adjusting mechanism drains the fluid at the outlet to the low-pressure sensitive cavity to form an upward low-pressure feedback force to the diaphragm, the downward spring force applied by the pre-tightening spring is applied to the upper part of the diaphragm, the low-pressure feedback force and the spring force form dynamic balance, and the balance force is transmitted to the valve core of the valve core assembly; when the outlet pressure is reduced, the pressure in the pressure sensitive cavity is reduced, the low-pressure feedback force is reduced, and after the dynamic balance is broken, the valve core moves downwards, so that the opening degree of a valve port between the valve core and the valve core seat is increased, and the outlet pressure is increased; when the outlet pressure is increased, the pressure in the pressure sensitive cavity is increased, the low-pressure feedback force is increased, and after the dynamic balance is broken, the valve core moves upwards, so that the opening degree of a valve port between the valve core and the valve core seat is reduced, and the outlet pressure is reduced; thereby achieving the purpose of voltage stabilization;
the pressure relief method comprises the following specific steps: when the pressure of the outlet suddenly increases and breaks through the safe pressure, the pressure in the low-pressure sensitive cavity increases, the diaphragm is pushed to move upwards, the safe pressure relief device moves upwards, the ejector pin valve core of the safe pressure relief device touches the adjusting screw and then moves downwards, so that the valve port between the fixed valve seat and the ejector pin valve core is opened, the pressure at the outlet is released through the safe pressure relief device, and the purpose of pressure relief is achieved.
Through the rational design runner, the relief pressure valve structure is comparatively compact to the realization reduces the product volume, improves the purpose of system integration, and case mouth design has the damping ring, adjusts through suitable clearance fit, realizes adjusting the function that response speed and differential regulation precision compromise. The pressure sensitive element is designed with a safety pressure release element, when the outlet pressure is increased sharply, the outlet pressure can be released to the air through the element, the damage to a working system caused by impact is avoided, and the safety is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A pressure relief valve comprising a housing, characterized by: the pressure-sensitive adjusting mechanism is characterized in that a pretightening force adjusting mechanism, a pressure-sensitive adjusting mechanism and a valve core assembly are sequentially arranged in the shell from top to bottom, the pretightening force adjusting mechanism acts on the pressure-sensitive adjusting mechanism and adjusts the acting force between the pressure-sensitive adjusting mechanism and the valve core assembly, a safety pressure relief device is arranged in the pressure-sensitive adjusting mechanism, and the safety pressure relief device is communicated with an outlet cavity (26) formed by the valve core assembly and the shell.
2. The pressure reducing valve according to claim 1, wherein: the pretightening force adjusting mechanism comprises a handle (5) which is in threaded connection with the shell, a knob (4) is fixedly arranged on the upper portion of the handle (5), the handle (5) extends downwards into the shell, a first spring seat (6) is fixedly arranged on the handle (5), and a pretightening spring (3) is arranged between the first spring seat (6) and the pressure sensitive adjusting mechanism.
3. The pressure reducing valve according to claim 1 or 2, wherein: the pressure sensitive adjusting mechanism comprises a partition plate seat (13) which is fixed in the shell in a sealing mode, a low-pressure sensitive element is arranged on the partition plate seat (13), a pre-tightening spring (3) of the pre-tightening force adjusting mechanism acts on the low-pressure sensitive element, and a low-pressure sensitive cavity (27) is formed between the low-pressure sensitive element and the partition plate seat (13); and a low-pressure drainage channel (30) is arranged on the partition plate seat (13), and the outlet cavity (26) is communicated with the low-pressure sensitive cavity (27) through the low-pressure drainage channel (30).
4. The pressure reducing valve according to claim 3, wherein: the low-pressure sensitive element comprises a diaphragm seat (11) and a diaphragm (12), the diaphragm (12) is sleeved on the diaphragm seat (11) and is fixedly pressed on the diaphragm seat (11) through a pressing plate (10), and the outer edge of the diaphragm (12) is fixedly pressed between the shell and a partition plate seat (13).
5. The pressure reducing valve according to claim 4, wherein: the flexible diaphragm is arranged at the diaphragm (12), gaps for deformation of the flexible diaphragm are arranged between the diaphragm seat (11) and the shell and between the pressing plate (10) and the shell, and a pressure relief opening (35) is formed in the bottom of the diaphragm seat (11).
6. The pressure reducing valve according to claim 5, wherein: the safety pressure relief device comprises a fixed valve seat (9) fixed on the upper portion of a diaphragm seat (11) in a sealing mode, an ejector pin valve core (8) and a first spring (14) are arranged in the fixed valve seat (9), the ejector pin valve core (8) is matched with a valve port arranged on the upper portion of the fixed valve seat (9), the ejector pin valve core (8) corresponds to an adjusting screw (7) arranged on a pretightening force adjusting mechanism, the adjusting screw (7) is located above the ejector pin valve core (8), an elastic sealing ring (21) is arranged between the ejector pin valve core (8) and the fixed valve seat (9), and the first spring (14) is located between the ejector pin valve core (8) and the diaphragm seat (11.
7. The pressure reducing valve according to any one of claims 1, 2, 4 to 6, wherein: the valve core assembly comprises a valve core seat (15) fixed inside a shell, a second spring seat (16) and a valve core (18) are arranged inside the valve core seat (15), a damping ring (29) is arranged on the upper portion of the valve core seat (15), the valve core (18) extends upwards out of the damping ring (29) and corresponds to the pressure sensitive adjusting mechanism, the lower portion of the valve core (18) is located inside the second spring seat (16), a sealed unloading cavity (28) is formed between the valve core (18) and the second spring seat (16), a reset elastic part is arranged in the unloading cavity (28), and the valve core (18) is matched with the valve core seat (15) and the second spring seat (16) to form a pressure reducing valve port (34).
8. The pressure reducing valve according to claim 7, wherein: the pressure reducing valve port (34) is communicated with an inlet (32) arranged on the shell, and the outlet cavity (26) corresponds to an outlet (33) arranged on the shell; a Y-shaped sealing ring (20) is arranged between the valve core (18) and the second spring seat (16), the reset elastic part is a reset spring (17), and the reset spring (17) is positioned between the valve core (18) and the second spring seat (16); a drainage hole (31) is arranged in the valve core (18), one end of the drainage hole (31) is communicated with the outlet cavity (26), and the other end of the drainage hole (31) is communicated with the unloading cavity (28).
9. The pressure reducing valve according to any one of claims 1, 2, 4 to 6, and 8, wherein: the shell comprises an upper shell (2) and a lower shell (1) which are connected in a sealing mode, a pre-tightening force adjusting mechanism is arranged in the upper shell (2), a valve core assembly is arranged in the lower shell (1), and a pressure sensitive adjusting mechanism is arranged at the connecting position of the upper shell (2) and the lower shell (1).
10. A pressure regulating method of a pressure reducing valve according to any one of claims 1 to 9, characterized in that: comprises a pressure reduction method, a pressure stabilization method and a pressure relief method; the pressure reduction method specifically comprises the following steps: the handle of the pretightening force adjusting mechanism is rotated to adjust the compression amount of the pretightening force spring, so as to adjust the pretightening force acting on the diaphragm adjusted by the pressure sensitive adjusting mechanism, and further the pressure applied to the valve core of the valve core assembly, thereby realizing the adjustment of the outlet pressure;
the voltage stabilizing method comprises the following specific steps: the low-pressure drainage channel of the pressure sensitive adjusting mechanism drains the fluid at the outlet to the low-pressure sensitive cavity to form an upward low-pressure feedback force to the diaphragm, the downward spring force applied by the pre-tightening spring is applied to the upper part of the diaphragm, the low-pressure feedback force and the spring force form dynamic balance, and the balance force is transmitted to the valve core of the valve core assembly; when the outlet pressure is reduced, the pressure in the pressure sensitive cavity is reduced, the low-pressure feedback force is reduced, and after the dynamic balance is broken, the valve core moves downwards, so that the opening degree of a valve port between the valve core and the valve core seat is increased, and the outlet pressure is increased; when the outlet pressure is increased, the pressure in the pressure sensitive cavity is increased, the low-pressure feedback force is increased, and after the dynamic balance is broken, the valve core moves upwards, so that the opening degree of a valve port between the valve core and the valve core seat is reduced, and the outlet pressure is reduced; thereby achieving the purpose of voltage stabilization;
the pressure relief method comprises the following specific steps: when the pressure of the outlet suddenly increases and breaks through the safe pressure, the pressure in the low-pressure sensitive cavity increases, the diaphragm is pushed to move upwards, the safe pressure relief device moves upwards, the ejector pin valve core of the safe pressure relief device touches the adjusting screw and then moves downwards, so that the valve port between the fixed valve seat and the ejector pin valve core is opened, the pressure at the outlet is released through the safe pressure relief device, and the purpose of pressure relief is achieved.
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| CN202011317087.7A CN112682548A (en) | 2020-11-23 | 2020-11-23 | Pressure reducing valve and pressure regulating method thereof |
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| CN202011317087.7A CN112682548A (en) | 2020-11-23 | 2020-11-23 | Pressure reducing valve and pressure regulating method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113883313A (en) * | 2021-09-29 | 2022-01-04 | 浙江瑞立空压装备有限公司 | Control valve and mechanical linkage pressure switch valve |
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| CN102287559A (en) * | 2011-08-03 | 2011-12-21 | 浙江三正气动有限公司 | Diaphragm type pressure-reducing valve |
| CN207229786U (en) * | 2017-08-30 | 2018-04-13 | 宁波市华益气动工程有限公司 | A kind of sensitive pressure reducing valve of overflow |
| CN110131477A (en) * | 2019-05-29 | 2019-08-16 | 河南航天液压气动技术有限公司 | A kind of multi-level throttle labyrinth decompression valve |
| CN110260005A (en) * | 2019-06-14 | 2019-09-20 | 西安航天动力研究所 | A kind of reversed off-load distribution impulse formula high-precision gas decompressor of impact resistance |
| CN110939762A (en) * | 2019-11-26 | 2020-03-31 | 西安航天动力研究所 | Pressure reducing regulating valve with safe pressure relief function |
| CN212616573U (en) * | 2020-05-27 | 2021-02-26 | 宁波市华益气动工程有限公司 | Miniature pressure reducing valve |
| CN111911683A (en) * | 2020-08-28 | 2020-11-10 | 富莱姆测控新技术研究(上海)有限公司 | Pressure reducing valve |
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| CN113883313A (en) * | 2021-09-29 | 2022-01-04 | 浙江瑞立空压装备有限公司 | Control valve and mechanical linkage pressure switch valve |
| CN113883313B (en) * | 2021-09-29 | 2023-12-22 | 浙江瑞立空压装备有限公司 | Mechanical linkage pressure switch valve |
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