CN117404502A - Micropressure safety valve - Google Patents

Micropressure safety valve Download PDF

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Publication number
CN117404502A
CN117404502A CN202210806059.4A CN202210806059A CN117404502A CN 117404502 A CN117404502 A CN 117404502A CN 202210806059 A CN202210806059 A CN 202210806059A CN 117404502 A CN117404502 A CN 117404502A
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CN
China
Prior art keywords
valve
air inlet
chamber
pressure
opening
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210806059.4A
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Chinese (zh)
Inventor
蒋文冬
李波
黄俊文
邹颖
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chongqing Ronghai Engineering Research Center of Ultrasonic Medicine Co Ltd
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Chongqing Ronghai Engineering Research Center of Ultrasonic Medicine Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Chongqing Ronghai Engineering Research Center of Ultrasonic Medicine Co Ltd filed Critical Chongqing Ronghai Engineering Research Center of Ultrasonic Medicine Co Ltd
Priority to CN202210806059.4A priority Critical patent/CN117404502A/en
Publication of CN117404502A publication Critical patent/CN117404502A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/044—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with more than one spring
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/012—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor characterised by internal passages or accessories therefor
    • A61B1/015—Control of fluid supply or evacuation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/303—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor for the vagina, i.e. vaginoscopes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/048—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded combined with other safety valves, or with pressure control devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/10—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with auxiliary valve for fluid operation of the main valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/20—Excess-flow valves
    • F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
    • F16K17/32—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting on a servo-mechanism or on a catch-releasing mechanism

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Surgery (AREA)
  • Radiology & Medical Imaging (AREA)
  • Molecular Biology (AREA)
  • Optics & Photonics (AREA)
  • Pathology (AREA)
  • Biophysics (AREA)
  • Physics & Mathematics (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Gynecology & Obstetrics (AREA)
  • Reproductive Health (AREA)
  • Safety Valves (AREA)

Abstract

The invention discloses a micro-pressure safety valve, which comprises a valve body, a valve cover, an end cover, a valve component and a film pressing assembly piece, wherein the valve body is connected with the valve cover to form a first chamber; the valve component is positioned in the first cavity and the second cavity, penetrates through the opening and is fixedly connected with the film pressing assembly; the valve cover is provided with a first air inlet, the end cover is provided with a second air inlet, the valve body is provided with an air outlet, the first air inlet and the second air inlet are connected with the same air source, and the air outlet is communicated with the atmosphere; the valve assembly can open or seal the opening under the action of the air inlet pressure of the first air inlet and the air inlet pressure of the second air inlet; the valve component can balance acting force generated in the first cavity, and under the condition of overlarge air inlet pressure, the air outlet pressure is controlled within a safe range, so that the rubber sleeve of the cervical endoscope is prevented from being damaged by overlarge air pressure.

Description

Micropressure safety valve
Technical Field
The invention relates to the technical field of medical equipment, in particular to a micro-pressure safety valve.
Background
The cervical endoscope uses a micro-pressure air source, wherein the micro-pressure air source refers to the air pressure of the air source is not more than 30kPa. Currently, a balloon is used as a gas input source, and the balloon supplies gas to the cervical endoscope through a gas supply pipeline. However, at present, the balloon is usually pressed manually to supply air, the output air pressure of the balloon is increased along with the increase of pressing times, the output air pressure of the balloon may exceed the pressure safety range, and the potential safety hazard of rubber sleeve explosion of the cervical endoscope exists.
Disclosure of Invention
The invention provides a micro-pressure safety valve, which solves the problem that the air pressure output by a balloon exceeds the pressure safety range in the prior art.
The invention provides a micro-pressure safety valve, which comprises a valve body, a valve cover, an end cover, a valve component and a film pressing assembly, wherein the valve body is connected with the valve cover to form a first chamber;
the film pressing assembly is arranged in the accommodating space formed by the valve body and the end cover, and forms a second chamber with the valve body and a third chamber with the end cover;
the valve cover is provided with a first air inlet for introducing air into the first cavity, the end cover is provided with a second air inlet for introducing air into the third cavity, and the valve body is provided with an air outlet communicated with the atmosphere; the first air inlet and the second air inlet are connected with the same air source;
the first chamber and the second chamber are provided with an opening therebetween, and the valve assembly is positioned in the first chamber and the second chamber, penetrates through the opening and is fixedly connected with the film pressing assembly and is used for opening or sealing the opening under the action of the air inlet pressure of the first air inlet and the air inlet pressure of the second air inlet.
In some embodiments, the valve assembly includes a valve stem, a seal that wraps around a sidewall of the valve stem, the seal abutting the opening with the valve assembly sealing the opening;
the first elastic component is accommodated in the second cavity, the first end of the first elastic component is fixedly connected with the valve body, and the second end of the first elastic component is fixedly connected with the film pressing assembly;
the second elastic component is arranged on the side wall of the first part of the valve rod, the first part of the valve rod is positioned in the first cavity, the first end of the second elastic component is fixedly connected with the valve cover, and the second end of the second elastic component is fixedly connected with the valve rod.
In some embodiments, the seal is a gasket comprising a sealing surface for sealing the opening, the sealing surface being a chamfer that slopes toward the valve stem in a direction toward the compression assembly.
In some embodiments, the cross-sectional area of the first portion of the valve stem is equal to the projected area of the sealing surface of the seal in the plane of the opening.
In some embodiments, the valve assembly further comprises a first seal ring disposed around a sidewall of the first portion of the valve stem and between the valve stem and the bonnet.
In some embodiments, the first resilient member is a conical spring and the cross-sectional area of the first end of the first resilient member is smaller than the cross-sectional area of the second end of the first resilient member.
In some embodiments, the film press assembly includes a support sheet, a first film connected to a first edge of the support sheet and a first sidewall of the end cap, respectively, and a second film connected to a second edge of the support sheet and a second sidewall of the end cap, respectively;
the support piece is made of rigid materials, and the valve rod is fixedly connected with one side, adjacent to the second cavity, of the support piece.
In some embodiments, the support piece is disposed opposite to the second air inlet, and the valve rod is fixedly connected to a central position of the support piece.
In some embodiments, the surface of the support sheet is provided with a reinforcing structure.
In some embodiments, the reinforcing structure is a reinforcing rib protruding from a surface of the support sheet, the reinforcing rib being disposed on a side of the support sheet adjacent to the third chamber.
The invention has the following advantages:
the micro-pressure safety valve provided by the embodiment of the invention comprises a valve body, a valve cover, an end cover, a valve component and a film pressing assembly piece, wherein the valve body is connected with the valve cover to form a first chamber, the film pressing assembly piece and the valve body form a second chamber, and the film pressing assembly piece and the end cover form a third chamber, and an opening is arranged between the first chamber and the second chamber; the valve component is positioned in the first cavity and the second cavity, penetrates through the opening and is fixedly connected with the film pressing assembly; the valve cover is provided with a first air inlet, the end cover is provided with a second air inlet, the valve body is provided with an air outlet, the first air inlet and the second air inlet are connected with the same air source, and the air outlet is communicated with the atmosphere; the valve assembly can open or seal the opening under the action of the air inlet pressure of the first air inlet and the air inlet pressure of the second air inlet; in the process of feeding air to the micro-pressure safety valve, the valve component can balance acting force generated in the first cavity, the air outlet pressure of the micro-pressure safety valve is dynamically regulated, and under the condition of overlarge air inlet pressure, the valve component opens the opening to discharge air in the first cavity from the air outlet through the second cavity, so that the air outlet pressure is controlled within a safe range, and the damage of the air pressure to the rubber sleeve of the cervical endoscope due to overlarge air pressure is avoided.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention.
Fig. 1 is a schematic structural diagram of a micropressure safety valve according to an embodiment of the present invention.
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises," "comprising," and/or "including" when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Embodiments of the invention may be described with reference to plan and/or cross-sectional illustrations that are schematic illustrations of idealized embodiments of the invention. Accordingly, the example illustrations may be modified in accordance with manufacturing techniques and/or tolerances.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present invention and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The embodiment of the invention provides a micro-pressure safety valve, which comprises a valve body 1, a valve cover 2, an end cover 3, a valve component and a film pressing assembly, wherein the valve body 1 is connected with the valve cover 2 to form a first chamber 101, as shown in fig. 1. The film pressing assembly is arranged in the accommodating space formed by the valve body 1 and the end cover 3, and forms a second chamber 102 with the valve body 1 and a third chamber 103 with the end cover 3. The valve cover 2 is provided with a first air inlet 4 for feeding air into the first chamber 101, the end cover 3 is provided with a second air inlet 5 for feeding air into the third chamber 103, the valve body 1 is provided with an air outlet 6 communicating with the atmosphere, and the first air inlet 4 and the second air inlet 5 are connected with the same air source. The first chamber 101 and the second chamber 102 have an opening 7 therebetween, and the valve assembly is located in the first chamber 101 and the second chamber 102, penetrates the opening 7 and is fixedly connected with the film pressing assembly, and is used for opening or sealing the opening 7 under the action of the air inlet pressure of the first air inlet 4 and the air inlet pressure of the second air inlet 5.
The valve body 1 plays a role in supporting and connecting, and the valve cover 2 and the end cover 3 are arranged on the valve body 1. The membrane-pressing assembly divides the accommodating space formed by the valve body 1 and the end cover 3 into a second chamber 102 and a third chamber 103, wherein the second chamber 102 is communicated with the outside air. The membrane pressing assembly can amplify and convert the gas pressure entering the micro-pressure safety valve from the second gas inlet 5 into an upward force, and the upward force drives the valve rod assembly to move upwards, so that the volume of the third chamber 103 is changed in a telescopic manner by the upward movement of the membrane pressing assembly. Accordingly, the valve assembly is moved up to open the opening 7 between the first chamber 101 and the second chamber 102. In the process of removing the opening 7 from the valve assembly, gas can enter the first chamber 101 through the first air inlet 4 and enter the second chamber 102 from the first chamber 101 through the opening 7, and because the second chamber 102 is communicated with the atmosphere, the gas flows out from the air outlet 6, and under the condition of overlarge air inlet pressure, the air outlet pressure can be controlled within a safe range, so that the damage of the rubber sleeve of the endoscope caused by overlarge air outlet pressure is avoided. Under the condition that the air inlet pressure is normal, the acting forces formed by the air entering the first chamber 101 from the first air inlet 4 are mutually compensated, so that a balance structure is formed, and the dynamic balance adjustment of the output pressure is realized.
It should be noted that the micropressure safety valve of the present invention may further have an air outlet (not shown) connected to a device using a micropressure air source, which may be, for example, a cervical endoscope. The air outlet may be in communication with the first chamber 101 or, alternatively, with the third chamber 103.
The micropressure safety valve of the invention can be installed on an air supply pipeline, in which case the first air inlet 4, the second air inlet 5 and the air outlet of the micropressure safety valve are respectively connected with a three-way joint by means of the three-way joint, and are connected with the air supply pipeline by means of the three-way joint. The micropressure safety valve according to the invention may also be fitted to a pressure vessel, in which case the second inlet opening 5 of the micropressure safety valve is connected to the pressure vessel body and the first inlet opening 4 of the micropressure safety valve is connected to the pressure vessel body or to the gas supply line.
The micro-pressure safety valve provided by the embodiment of the invention comprises a valve body 1, a valve cover 2, an end cover 3, a valve component and a film pressing assembly piece, wherein the valve body 1 is connected with the valve cover 2 to form a first chamber 101, the film pressing assembly piece and the valve body 1 form a second chamber 102, and the film pressing assembly piece and the end cover 3 form a third chamber 103, and an opening 7 is arranged between the first chamber 101 and the second chamber 102; the valve component is positioned in the first cavity 101 and the second cavity 102, penetrates through the opening 7 and is fixedly connected with the film pressing assembly; the valve cover 2 is provided with a first air inlet 4, the end cover 3 is provided with a second air inlet 5, the valve body 1 is provided with an air outlet 6, the first air inlet 4 and the second air inlet 5 are connected with the same air source, and the air outlet 6 is communicated with the atmosphere; the valve assembly is capable of opening or sealing the opening 7 under the action of the intake pressure of the first intake port 4 and the intake pressure of the second intake port 5; in the process of feeding air to the micro-pressure safety valve, the valve component can balance acting force generated in the first chamber 101, the air outlet pressure of the micro-pressure safety valve is dynamically regulated, under the condition that the air inlet pressure is overlarge, the valve component can open the opening 7 to discharge air in the first chamber 101 from the air outlet, and the micro-pressure safety valve can control the air outlet pressure within a safety range, so that the rubber sleeve of the cervical endoscope is prevented from being damaged by overlarge air pressure.
In some embodiments, the valve assembly comprises a valve stem 8, a seal 9, a first resilient member 10 and a second resilient member 11, the seal 9 enveloping the side wall of the valve stem 8, the seal 9 abutting the opening 7 in the case of the valve assembly sealing the opening 7.
The first elastic component 10 is accommodated in the second chamber 102, and a first end of the first elastic component 10 is fixedly connected with the valve body 1, and a second end of the first elastic component 10 is fixedly connected with the film pressing assembly.
The second elastic component 11 is disposed on a side wall of the first portion of the valve rod 8, the first portion of the valve rod 8 is located in the first chamber 101, a first end of the second elastic component 11 is fixedly connected with the valve cover 2, and a second end of the second elastic component 11 is fixedly connected with the valve rod 8.
The valve rod 8 is a metal part, the sealing element 9 is a sealing filler, and the sealing filler and the valve rod 8 can form an integral part in an encapsulation mode, and the integral part is called a valve and is used for controlling the opening 7 to be opened or closed.
In the embodiment of the present disclosure, the first elastic member 10 and the second elastic member 11 are both springs, and the second elastic member 11 is circumferentially sleeved on the first portion of the valve stem 8.
In some embodiments, the seal 9 comprises a sealing surface for sealing the opening 7, the sealing surface being a chamfer which slopes towards the valve stem 8 in a direction towards the press-die assembly. That is, in fig. 1, the sealing surface of the seal 9 is contracted inward toward the opening 7.
In some embodiments, the cross-sectional area of the first portion of the valve stem 8 is equal to the projected area of the sealing surface of the seal 9 in the plane of the opening 7. In this way, in the first chamber 101, the first air inlet 4 generates a force F1 directed upwards on the first portion of the valve stem 8, a force component F2 directed downwards on the sealing surface of the sealing member 9, and when the cross-sectional area of the first portion of the valve stem 8 is equal to the projected area of the sealing surface on the plane of the opening 7, F1 and F2 cancel each other, the valve assembly can assume a hovering state, and a balanced structure is formed.
In some embodiments, the valve assembly further comprises a first seal ring 12, the first seal ring 12 being disposed around a sidewall of the first portion of the valve stem 8 and between the valve stem 8 and the bonnet 2.
In some embodiments, the valve assembly further comprises a second sealing ring 13, the second sealing ring 13 being used to seal the valve body 1 and the bonnet 2. The first seal ring 12 and the second seal ring 13 may each be an O-ring.
In some embodiments, the first resilient member 10 is a conical spring and the cross-sectional area of the first end of the first resilient member 10 is smaller than the cross-sectional area of the second end of the first resilient member 10. That is, the conical spring is smaller at the end adjacent to the valve body 1 and larger at the end adjacent to the compression assembly, so that the conical spring has better stability after being stressed than a normal cylindrical spring.
In some embodiments, the film press assembly includes a support sheet 14, a first film 15, and a second film 16, the first film 15 being connected to a first edge of the support sheet 14 and a first sidewall of the end cap 3, respectively, and the second film 16 being connected to a second edge of the support sheet 14 and a second sidewall of the end cap 3, respectively.
The material of the support piece 14 is a rigid material, and the valve rod 8 is fixedly connected with one side of the support piece 14 adjacent to the second chamber 102. Specifically, the material of the support piece 14 may be plastic, and a surface of a side of the support piece 14 adjacent to the second chamber 102 is a flat surface, and the surface is provided with a mounting seat, and the valve rod 8 is fixed in the mounting seat.
In some embodiments, the support piece 14 is disposed opposite the second air inlet 5, and the valve stem 8 is fixedly connected to the center of the support piece 14.
Because the valve rod 8 is a component with vertical action, the valve rod 8 is arranged at the center of the supporting piece 14, so that the supporting piece 14 can be ensured not to deflect under the conditions of vortex and partial uneven stress of gas and the like to change the mechanical direction, the valve rod 8 can vertically lift, and the opening 7 is ensured to be normally opened or closed.
In some embodiments, the surface of the support sheet 14 is provided with a reinforcing structure 17, the reinforcing structure 17 can increase the strength of the support sheet 14, improve the reliability, and the reinforcing structure 17 can be a reinforcing plate or a reinforcing rib.
In the embodiment of the present invention, the reinforcing structure is a reinforcing rib protruding from the surface of the supporting sheet 14, and the reinforcing rib is disposed on one side of the supporting sheet 14 adjacent to the third chamber 103. The reinforcing ribs are arranged on one side of the support sheet 14 adjacent to the third chamber 103, so that the support sheet 14 can be prevented from being fully contacted with the bottom of the end cover 3 to form a seal, and the stress of the support sheet 14 is prevented from being influenced.
The working process of the micropressure safety valve provided by the embodiment of the invention is as follows:
the gas enters the third chamber 103 from the second gas inlet 5, and an upward force is generated on the supporting piece 14 under the action of the gas pressure, and after the force overcomes the precompression force of the first elastic component 10, the supporting piece 14 and the valve rod 8 are pushed to move upwards, when the valve rod 8 moves upwards, the first elastic component 10 is further compressed to generate larger tension, until the generated tension and the force generated on the supporting piece 14 reach balance, and the valve rod 8 stops moving upwards and is in a hovering state. During the upward movement of the valve stem 8, the sealing surface of the sealing member 9 is disengaged from the opening 7, and the gas supply passage is opened, and gas entering the first chamber 101 from the first gas inlet 4 enters the second chamber 102 through the opening 7 and flows to the external environment through the gas outlet 6, thereby releasing the excessive atmospheric pressure in the micro-pressure relief valve.
With the continuous outflow of the gas in the micropressure safety valve, the pressures in the first chamber 101 and the third chamber 103 also gradually decrease, when the pressure is insufficient to balance the tension of the first elastic member 10, the support piece 14 starts to move downwards, at this time, the first elastic member 10 starts to relax, the tension thereof also decreases, the valve rod 8 moves downwards along with the support piece 14 under the action of the second elastic member 11 until the sealing surface of the sealing member 9 is driven to abut against the opening 7 again, the gas supply channel is closed again to cut off the outward discharge of the gas, and the valve rod 8 stops moving until the balance is reached again.
Aiming at the problem that the conventional cervical endoscope has no safety measure for preventing the rubber sleeve from bursting, the embodiment of the invention provides a micropressure safety valve which is arranged between an air source and the cervical endoscope, so that the air pressure conveyed to the cervical endoscope can be controlled within a safety range, and the rubber sleeve of the cervical endoscope is prevented from being damaged by excessive air pressure.
Those skilled in the art will appreciate that while some embodiments described herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the embodiments and form different embodiments.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.

Claims (10)

1. The micro-pressure safety valve is characterized by comprising a valve body, a valve cover, an end cover, a valve component and a film pressing assembly, wherein the valve body is connected with the valve cover to form a first chamber;
the film pressing assembly is arranged in the accommodating space formed by the valve body and the end cover, and forms a second chamber with the valve body and a third chamber with the end cover;
the valve cover is provided with a first air inlet for introducing air into the first cavity, the end cover is provided with a second air inlet for introducing air into the third cavity, and the valve body is provided with an air outlet communicated with the atmosphere; the first air inlet and the second air inlet are connected with the same air source;
the first chamber and the second chamber are provided with an opening therebetween, and the valve assembly is positioned in the first chamber and the second chamber, penetrates through the opening and is fixedly connected with the film pressing assembly and is used for opening or sealing the opening under the action of the air inlet pressure of the first air inlet and the air inlet pressure of the second air inlet.
2. The micropressure safety valve of claim 1, characterized in that the valve assembly comprises a valve stem, a seal, a first elastic member and a second elastic member, the seal covering a side wall of the valve stem, the seal abutting against the opening with the valve assembly sealing the opening;
the first elastic component is accommodated in the second cavity, the first end of the first elastic component is fixedly connected with the valve body, and the second end of the first elastic component is fixedly connected with the film pressing assembly;
the second elastic component is arranged on the side wall of the first part of the valve rod, the first part of the valve rod is positioned in the first cavity, the first end of the second elastic component is fixedly connected with the valve cover, and the second end of the second elastic component is fixedly connected with the valve rod.
3. The micro-pressure relief valve of claim 2, wherein the seal is a sealing packing comprising a sealing surface for sealing the opening, the sealing surface being a chamfer that slopes toward the valve stem in a direction toward the squeeze film assembly.
4. A micropressure safety valve according to claim 3, characterized in that the cross-sectional area of the first part of the valve stem is equal to the projected area of the sealing surface of the seal in the plane of the opening.
5. The micropressure safety valve of claim 2, wherein the valve assembly further comprises a first seal ring disposed around a sidewall of the first portion of the valve stem and between the valve stem and the valve cover.
6. The micropressure safety valve of claim 2, characterized in that the first elastic member is a conical spring and the cross-sectional area of the first end of the first elastic member is smaller than the cross-sectional area of the second end of the first elastic member.
7. The micro-pressure relief valve according to any one of claims 1-6, wherein said membrane assembly comprises a support sheet, a first membrane and a second membrane, said first membrane being connected to a first edge of said support sheet and a first sidewall of said end cap, respectively, said second membrane being connected to a second edge of said support sheet and a second sidewall of said end cap, respectively;
the support piece is made of rigid materials, and the valve rod is fixedly connected with one side, adjacent to the second cavity, of the support piece.
8. The micro-pressure safety valve according to claim 7, wherein the support piece is disposed opposite to the second air inlet, and the valve rod is fixedly connected to the central position of the support piece.
9. The micro-pressure relief valve according to claim 7, wherein the surface of the support sheet is provided with a reinforcing structure.
10. The micro-pressure relief valve according to claim 9, wherein the reinforcing structure is a reinforcing rib protruding from a surface of the support sheet, the reinforcing rib being disposed on a side of the support sheet adjacent to the third chamber.
CN202210806059.4A 2022-07-08 2022-07-08 Micropressure safety valve Pending CN117404502A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210806059.4A CN117404502A (en) 2022-07-08 2022-07-08 Micropressure safety valve

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CN202210806059.4A CN117404502A (en) 2022-07-08 2022-07-08 Micropressure safety valve

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CN117404502A true CN117404502A (en) 2024-01-16

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