Pressure relief valve and anesthesia machine

Abstract

The application discloses a pressure relief valve and an anesthesia machine. The pressure relief valve comprises a valve body assembly and a valve rod assembly. The valve body assembly comprises a mounting shell, a driving shell and a first elastic member. The mounting shell is provided with a first stepped surface. The driving shell is provided with a second stepped surface. The driving shell is sleeved with the valve rod assembly, the mounting shell is sleeved with the driving shell, and the part of the driving shell provided with the second stepped surface is protruded out of the mounting shell. The first elastic member is sleeved with the outer wall surface of the driving shell, and the two ends of the first elastic member are respectively abutted with the first stepped surface and the second stepped surface. One end of the valve rod assembly is protruded out of one end of the driving shell and connected with the mounting shell. The other end of the valve rod assembly and the other end of the driving shell are both used for abutting with a valve piece assembly. The first elastic member is used to realize the self-adaptive abutment of the driving shell and the valve piece assembly, that is, the first elastic member is used to adjust the matching precision of the pressure relief valve and the valve piece assembly in real time, so that the pressure relief valve can be matched with any anesthesia machine.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a pressure relief valve and an anesthesia machine. Background Technology

[0002] An anesthesia machine is a machine that delivers anesthetic drugs into the alveoli of a patient through a mechanical circuit, allowing them to diffuse into the bloodstream and produce a general anesthesia effect.

[0003] Anesthesia machines typically require an adjustable pressure limiting (APL) valve. This manually adjustable valve is primarily used to control airway pressure in the manual control mode of the anesthesia machine system. When airway pressure in the breathing circuit is too high, medical staff can manually operate the APL valve to reduce airway pressure and ensure the patient's safety.

[0004] However, due to processing and assembly errors, the pressure relief valves on each anesthesia machine need to be installed and adjusted to ensure the adjustment accuracy of the valves. This makes them essentially dedicated pressure relief valves, resulting in difficult installation, poor interchangeability, and high replacement and installation costs. Utility Model Content

[0005] The purpose of this application is to provide a pressure relief valve and an anesthesia machine. The matching accuracy of the pressure relief valve and the valve plate assembly is adjusted in real time by the first elastic element on the pressure relief valve, so that the pressure relief valve can be matched with any anesthesia machine, thereby reducing the installation difficulty and replacement cost.

[0006] This application provides a pressure relief valve, comprising: a valve body assembly and a valve stem assembly; the valve body assembly includes a mounting shell, a drive shell, and a first elastic member; the mounting shell has a first stepped surface; the outer wall of the drive shell has a second stepped surface; the drive shell is sleeved on the valve stem assembly; the mounting shell is sleeved on the drive shell, and the portion of the drive shell with the second stepped surface extends out of the mounting shell; the first elastic member is sleeved on the outer wall of the drive shell, and its two ends respectively abut against the first stepped surface and the second stepped surface; one end of the valve stem assembly extends out of one end of the drive shell and is connected to the mounting shell; the other end of the valve stem assembly and the other end of the drive shell are both used to abut against a valve plate assembly; the drive shell enables the valve stem assembly to move axially along the pressure relief valve, so that the valve stem assembly can drive the opening and closing of the valve plate assembly; under the elastic force of the first elastic member, the drive shell can move relative to the mounting shell axially along the pressure relief valve, so that the other end of the drive shell remains in abutting against the valve plate assembly.

[0007] In some possible implementations, a drive unit is provided inside the drive housing, and a mating part is provided on the outer wall of the valve stem assembly. The drive unit and the mating part are connected. The mounting housing can drive the valve stem assembly to rotate around the axial direction of the pressure relief valve. When the valve stem assembly rotates, the drive unit causes the valve stem assembly to move along the axial direction of the pressure relief valve through the mating part.

[0008] In some possible implementations, the mounting housing includes a valve cap and a housing, which are connected axially along the pressure relief valve; the housing is fitted onto the drive housing; one end of the valve stem assembly connected to the mounting housing faces the valve cap, the valve cap is provided with a first connector, and the valve stem assembly is provided with a second connector; the second connector is connected to the first connector so that the valve cap can drive the valve stem assembly to rotate axially around the pressure relief valve, and the valve stem assembly can move relative to the valve cap along the axial direction of the pressure relief valve.

[0009] In some possible implementations, the first connector has a connecting hole, and the second connector is a columnar member; or, the first connector is a columnar member, and the second connector has a connecting hole; the inner wall surface of the connecting hole includes a first plane, and the outer wall surface of the columnar member includes a second plane, both the first plane and the second plane extending along the axial direction of the pressure relief valve; the columnar member is inserted into the connecting hole, and the first plane and the second plane are opposite to each other, so that the valve cap can drive the valve stem assembly to rotate around the axial direction of the pressure relief valve, and the valve stem assembly can move relative to the valve cap along the axial direction of the pressure relief valve.

[0010] In some possible implementations, the end of the drive housing that protrudes from the valve stem assembly faces the valve cap. The valve cap has an extension that extends into the housing. The extension has a third connector, and the drive housing has a fourth connector. The valve cap moves away from the valve plate assembly, and the third and fourth connectors are connected so that the valve cap can drive the drive housing away from the valve plate assembly, so that the drive unit drives the valve stem assembly away from the valve plate assembly through the mating part.

[0011] In some possible implementations, the outer casing includes a first casing and a second casing. Along the axial direction of the pressure relief valve, the valve cap, the first casing, and the second casing are connected in sequence. The second casing is used for fixed connection with the frame. The first casing has a mounting groove at one end facing the second casing, and the second casing has a mating surface at one end facing the first casing. Alternatively, the second casing has a mounting groove at one end facing the first casing, and the first casing has a mating surface at one end facing the second casing. The mating surface has a recessed mating groove. A detection element and a tactile elastic element are provided in the mounting groove. The valve cap can drive the first casing to rotate around the axial direction of the pressure relief valve. When the first casing rotates to the point where the mounting groove and the mating groove are misaligned, the two ends of the tactile elastic element abut against the detection element and the mating surface, respectively. When the first casing rotates to the point where the mounting groove and the mating groove are connected, the tactile elastic element drives the detection element to extend into the mating groove, and the detection element contacts the inner wall surface of the mating groove to detect the position of the first casing.

[0012] In some possible implementations, the first housing is provided with a connecting groove, the valve cap is provided with an extension that extends into the first housing, and the extension is provided with a connecting protrusion; or, the extension is provided with a connecting groove, and the first housing is provided with a connecting protrusion; both the connecting groove and the connecting protrusion extend along the axial direction of the pressure relief valve; the connecting protrusion extends into the connecting groove so that the valve cap can drive the first housing to rotate, and so that the valve cap can move away from the first housing.

[0013] In some possible implementations, the mounting shell also includes an exterior component, which is fitted onto the outer shell and covers the gap between the first shell and the second shell. The exterior component is fixedly connected to the first shell or the second shell.

[0014] In some possible implementations, the drive unit includes a drive column disposed within the drive housing, and the mating part includes a helical groove disposed on the outer wall surface of the valve stem assembly; or, the drive unit includes a helical groove disposed within the drive housing, and the mating part includes a drive column disposed on the outer wall surface of the valve stem assembly.

[0015] In some possible implementations, the drive part includes an internal thread located within the drive housing, and the mating part includes an external thread located on the outer wall surface of the valve stem assembly.

[0016] In some possible implementations, the valve stem assembly includes a first valve stem, a second valve stem, and a second elastic element. The first valve stem has a first cavity, and the second valve stem has a second cavity. A portion of the second valve stem extends into the first cavity, and the first and second cavities are connected. The second elastic element is disposed within the first and second cavities, with its two ends abutting against the bottom surfaces of the first and second cavities, respectively. The end of the first valve stem away from the second valve stem protrudes from the drive housing, and the end of the second valve stem away from the first valve stem is used to abut against the valve stem assembly. A drive unit is disposed on the outer wall surface of the first valve stem. The mounting housing can drive the first valve stem to rotate. When the first valve stem rotates, the drive unit moves the first valve stem away from or towards the second valve stem through a mating part, thereby changing the elastic force of the second elastic element and thus changing the force of the valve stem assembly abutting against the valve plate assembly.

[0017] In some possible implementations, the valve stem assembly and the valve plate assembly have an air hole at the abutting end, and the air hole penetrates the inner wall of the second cavity and the outer wall of the second valve stem.

[0018] In some possible implementations, the valve plate assembly includes a mounting base, a diaphragm, a valve plate, and a fixing element; the mounting base includes a mounting plate, a support frame, and a pressure relief pipe, both of which are fixed to the support frame; one side surface of the mounting plate is used to abut against the drive housing, and the pressure relief pipe is located on the side of the mounting plate away from the drive housing; the outlet of the pressure relief pipe faces the mounting plate, and the inlet of the pressure relief pipe is used to communicate with the breathing airway of the anesthesia machine;

[0019] Both the diaphragm and the valve plate are disposed between the pressure relief pipe and the mounting plate; the diaphragm is fixed to the support frame; the valve plate is fixed to the diaphragm by a fastener, and the valve plate covers the air outlet of the pressure relief pipe; the fastener has a contact part that penetrates the diaphragm and the mounting plate and extends to the side of the mounting plate facing the valve stem assembly, and the contact part is used to abut against the valve stem assembly.

[0020] In some possible implementations, the fixing member is also provided with a guide portion, which is located on the side of the fixing member away from the contact portion and contacts the outer wall surface of the pressure relief pipe; when the force of the valve stem assembly against the contact portion changes, the diaphragm can deform and the guide portion moves along the outer wall surface of the pressure relief pipe.

[0021] The second aspect of this application provides an anesthesia machine, including an expiratory airway and a pressure relief valve according to any one of the first aspects of this application, the pressure relief valve being connected to the expiratory airway.

[0022] The pressure relief valve and anesthesia machine provided in this application, in their initial state, have one end of the valve stem assembly of the drive housing connected to the mounting housing, and the first elastic element is in a pre-compressed state. Both ends of the drive housing are respectively limited by the mounting housing and the first elastic element to maintain a stable initial state.

[0023] When installing the pressure relief valve into the anesthesia machine, the mounting housing is fixed to the frame, and the surface in contact with the frame can be called the reference surface. The distance between the reference surface and the end of the valve stem assembly and valve plate assembly of the drive housing that abuts is called the first distance. Typically, the anesthesia machine has a built-in valve plate assembly, and the distance between the valve plate assembly and the reference surface is called the second distance. Ideally, the first distance equals the second distance. At this point, when the pressure relief valve is installed in the anesthesia machine, the drive housing remains in its initial state, and the end of the valve stem assembly and valve plate assembly of the drive housing that abuts is precisely in contact with the valve plate assembly.

[0024] However, under normal circumstances, due to the influence of processing and assembly errors, the first distance and the second distance are not the same. If the first distance is greater than the second distance, the drive housing can move upward, the first elastic element will compress, and thus the end of the valve stem assembly and valve plate assembly of the drive housing abuts against the valve plate assembly. Conversely, if the first distance is less than the second distance, the drive housing can move downward, the first elastic element will extend, and thus the end of the valve stem assembly and valve plate assembly of the drive housing abuts against the valve plate assembly.

[0025] In this application, a first elastic element is used to achieve adaptive contact between the drive housing and the valve plate assembly. This means the first elastic element is used to adjust the matching accuracy of the pressure relief valve and the valve plate assembly in real time, allowing the pressure relief valve in this application to be arbitrarily matched with anesthesia machines. Compared with related technologies, the pressure relief valve in this application is simple to install, has strong applicability, and significantly reduces the cost of purchasing spare parts. Attached Figure Description

[0026] To more clearly illustrate the technical solution of this application, the accompanying drawings used in the embodiments will be briefly described below.

[0027] Figure 1 This is an installation diagram of the pressure relief valve provided in the embodiments of this application.

[0028] Figure 2 This is an exploded structural diagram of the pressure relief valve provided in the embodiments of this application.

[0029] Figure 3 This is a schematic diagram of the internal structure of the pressure relief valve provided in the embodiments of this application.

[0030] Figure 4 This is a schematic diagram of the valve cap structure in the pressure relief valve provided in the embodiment of this application.

[0031] Figure 5 This is a schematic diagram of the cross-sectional structure of the valve cap in the pressure relief valve provided in the embodiment of this application.

[0032] Figure 6 This is a schematic diagram of the exploded structure of the outer shell of the pressure relief valve provided in the embodiments of this application.

[0033] Figure 7 This is a schematic diagram of the internal structure of the housing of the pressure relief valve provided in the embodiments of this application.

[0034] Figure 8 This is a schematic diagram of the second shell structure in the pressure relief valve provided in the embodiments of this application.

[0035] Figure 9 This is a schematic diagram of the exploded structure of the valve cap and the first shell in the pressure relief valve provided in the embodiment of this application.

[0036] Figure 10 This is a schematic cross-sectional view of the valve stem assembly in the pressure relief valve provided in this application embodiment.

[0037] Figure 11 This is an exploded schematic diagram of the valve plate assembly in the pressure relief valve provided in the embodiments of this application.

[0038] Figure 12 This is a schematic diagram of the internal structure of the valve plate assembly in the pressure relief valve provided in the embodiments of this application.

[0039] Explanation of reference numerals in the attached drawings: 10-Anesthesia machine; 20-Pressure relief valve; 30-Valve body assembly; 100-Mounting housing; 101-First stepped surface; 102-Mounting surface; 110-Valve cap; 111-First connector; 112-Extension; 113-Third connector; 114-Connecting protrusion; 115-Connecting hole; 120-Outer shell; 121-First shell; 122-Second shell; 123-Mounting groove; 124-Mating surface; 125-Mating groove; 126-Detection element; 127-Tactile elastic element; 128-Limiting platform; 129-Blocking post; 130-Connecting groove; 140-Appearance element; 150-Decorative cover; 200-Drive housing; 201-Second stepped surface; 202-Top of drive housing; 20 3- Bottom end of drive housing; 210- Drive part; 220- Fourth connecting member; 300- Valve stem assembly; 301- Top end of valve stem assembly; 302- Bottom end of valve stem assembly; 310- Mating part; 320- Second connecting member; 330- First valve stem; 331- First cavity; 340- Second valve stem; 341- Second cavity; 342- Air hole; 350- Second elastic element; 360- Stop element; 400- First elastic element; 500- Valve plate assembly; 510- Fixing seat; 511- Mounting plate; 512- Support frame; 513- Pressure relief pipe; 514- Air inlet; 515- Air outlet; 520- Diaphragm; 530- Valve plate; 540- Fixing member; 541- Contact part; 542- Guide part. Detailed Implementation

[0040] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0041] Please refer to Figure 1 , Figure 2 and Figure 3 The pressure relief valve 20 provided in this embodiment includes a valve body assembly 30 and a valve stem assembly 300. The valve body assembly 30 includes a mounting shell 100, a drive shell 200, and a first elastic member 400. The mounting shell 100 has a first stepped surface 101. The drive shell 200 has a second stepped surface 201. The drive shell 200 is sleeved on the valve stem assembly 300.

[0042] Mounting housing 100 is fitted onto driving housing 200, with a portion of driving housing 200 having a second stepped surface 201 extending beyond mounting housing 100. First elastic member 400 is fitted onto the outer wall of driving housing 200, with its two ends abutting against the first stepped surface 101 and the second stepped surface 201, respectively. One end of valve stem assembly 300 protrudes from one end of driving housing 200 and is connected to mounting housing 100. The other end of valve stem assembly 300 protrudes from the other end of driving housing 200, and both the other end of valve stem assembly 300 and the other end of driving housing 200 are used to abut against valve disc assembly 500. Figures 1 to 3With the direction in the middle as a reference, the end of the valve stem assembly 300 that protrudes from the drive housing 200 is the top end 301 of the valve stem assembly 300, and the end where the valve stem assembly 300 and the valve plate assembly 500 abut is the bottom end 302 of the valve stem assembly 300. The end of the drive housing 200 through which the valve stem assembly 300 protrudes is the top end 202 of the drive housing 200, and the end where the drive housing 200 and the valve plate assembly 500 abut is the bottom end 203 of the drive housing 200.

[0043] The drive housing 200 can drive the valve stem assembly 300 to move axially along the pressure relief valve 20, so that the valve stem assembly 300 can drive the valve plate assembly 500 to open and close. Under the elastic force of the first elastic member 400, the drive housing 200 can move relative to the mounting housing 100 along the axial direction of the pressure relief valve 20, so that the bottom end 203 of the drive housing 200 remains in contact with the valve plate assembly 500.

[0044] When the air pressure in the anesthesia machine 10 is too high, the valve stem assembly 300 can drive the valve plate assembly 500 to open to release pressure and improve the safety factor.

[0045] The pressure relief valve 20 and anesthesia machine 10 provided in this application, in their initial state, have the top end 301 of the valve stem assembly 300 connected to the mounting shell 100, and the first elastic element 400 is in a pre-compressed state. The two ends of the drive shell 200 are respectively limited by the mounting shell 100 and the first elastic element 400 to maintain the drive shell 200 in a stable initial state. Those skilled in the art will understand that the first elastic element 400 can be an elastic element such as a spring.

[0046] It is known that when the pressure relief valve 20 is installed on the anesthesia machine 10, the mounting housing 100 is fixed to the frame of the anesthesia machine 10, and the mounting surface 102 of the mounting housing 100 is in contact with the bearing surface of the frame (not shown in the figure). The distance between the mounting surface 102 and the bottom end 203 of the drive housing 200 is called the first distance L. Normally, the anesthesia machine 10 has a built-in valve plate assembly 500, and the distance between the valve plate assembly 500 and the bearing surface is called the second distance. Ideally, the first distance is equal to the second distance. At this time, when the pressure relief valve 20 is installed on the anesthesia machine 10, the drive housing 200 remains stationary in its initial state, and the bottom end 203 of the drive housing 200 and the valve plate assembly 500 are in contact.

[0047] However, under normal circumstances, due to processing and assembly errors, the first distance and the second distance are not the same. If the first distance is greater than the second distance, a gap will exist between the mounting surface 102 and the bearing surface. This may cause the drive housing 200 to excessively press against the valve plate assembly 500, which may further prevent the valve plate assembly 500 from opening to release pressure. If the first distance is less than the second distance, the bottom end 203 of the drive housing 200 will not be able to abut against the valve plate assembly 500, which may further prevent the valve plate assembly 500 from closing and thus fail to provide pressure relief.

[0048] To address the aforementioned issues, in this embodiment, the drive housing 200 can move axially relative to the mounting housing 100 in the pressure relief valve 20. A first elastic element 400 is sleeved on the outer periphery of the drive housing 200, with its opposite ends pressing against the first stepped surface 101 of the mounting housing 100 and the second stepped surface 201 of the drive housing 200, respectively. It is understood that the initial length of the first elastic element 400 can be greater than the distance between the first stepped surface 101 and the second stepped surface 201. Thus, after the drive housing 200 is installed, the first elastic element 400 is kept in a compressed state, and through its rebound action, it presses the drive housing 200 against the valve plate assembly 500.

[0049] In this application, since the drive housing 200 can move relative to the mounting housing 100 along the axial direction of the pressure relief valve 20, when the first distance is greater than the second distance, the first elastic member 400 is compressed, and the drive housing 200 moves upward along the axial direction of the pressure relief valve 20, so that the drive housing 200 abuts against the valve plate assembly 500. When the first distance is less than the second distance, the first elastic member 400 extends, so that the drive housing 200 moves downward along the axial direction of the pressure relief valve 20, so that the drive housing 200 abuts against the valve plate assembly 500. Therefore, whether the first distance is greater than the second distance or less than the second distance, it will not affect the installation state of the mounting housing 100. In this application, it is only necessary to ensure that the initial length of the first elastic member 400 is greater than the distance between the first step surface 101 and the second step surface 201, so that the elastic force of the first elastic member 400 can be used to press the drive housing 200 against the valve plate assembly 500.

[0050] In this application, the mounting housing 100 and the drive housing 200 can be separately assembled on the frame; that is, the mounting housing 100 and the drive housing 200 are separate before being assembled onto the frame. It is understood that the first stepped surface 101 is a fixed, immovable surface; that is, after the mounting housing 100 is installed on the frame, the relative position of the first stepped surface 101 is fixed. In this application, the drive housing 200 is first fitted onto the valve stem assembly 300, and the relative distance between the bottom end 302 of the valve stem assembly 300 and the bottom end 203 of the drive housing 200 is adjusted so that when the drive housing 200 presses against the valve plate assembly 500, the bottom end 302 of the valve stem assembly 300 can open and close the valve plate assembly 500. Next, the first elastic element 400 is sleeved on the outer peripheral wall of the drive housing 200. At this time, one end of the first elastic element 400 presses against the second stepped surface 201. Then, the drive housing 200 is placed on the valve plate assembly 500. After that, the mounting housing 100 is sleeved on the top end 202 of the drive housing 200 and fixed to the frame. During this process, since the initial length of the first elastic element 400 is greater than the distance between the first stepped surface 101 and the second stepped surface 201, there is still a gap between the mounting surface 102 of the mounting housing 100 and the bearing surface of the frame when the first stepped surface 101 contacts the first elastic element 400. When the mounting housing 100 moves closer to the first elastic element 400, there is still a gap between the mounting surface 102 of the mounting housing 100 and the bearing surface of the frame. As the frame, i.e. the mounting surface 102, moves closer to the bearing surface, the first elastic element 400 is compressed. As a result, the first elastic element 400 applies a force to the second stepped surface 201 of the drive housing 200 in the direction of the valve plate assembly 500. This causes the bottom end 203 of the drive housing 200, i.e. the end of the drive housing 200 facing the valve plate assembly 500, to press against the valve plate assembly 500. Since the valve stem assembly 300 is pre-assembled with the drive housing 200, when the drive housing 200 is pressed against the valve plate assembly 500, the valve stem assembly 300 can also be pressed against the valve plate assembly 500, thereby ensuring the installation accuracy of the valve stem assembly 300.

[0051] Therefore, in this application, the impact of the difference between the first and second distances on the installation accuracy of the drive housing 200 and the valve stem assembly 300 can be disregarded. This application achieves adaptive contact between the drive housing 200 and the valve plate assembly 500 by relying on the first elastic element 400, that is, the first elastic element 400 is used to adjust the matching accuracy of the pressure relief valve 20 and the valve plate assembly 500 in real time. Therefore, the pressure relief valve 20 can be installed on the anesthesia machine 10 after the scale is printed on it, and the pressure relief valve 20 of this application can be matched with any anesthesia machine 10. Compared with related technologies, the pressure relief valve 20 of this application is simple to install, has strong applicability, and significantly reduces the cost of spare parts procurement.

[0052] Of course, those skilled in the art will also understand that the drive housing 200 can also be integrated with the mounting housing 100 as a whole and then installed on the rack as a whole. This solution will be further described later.

[0053] In some embodiments, reference Figure 1 and Figure 2 The drive housing 200 contains a drive unit 210, and the outer wall of the valve stem assembly 300 contains a mating part 310. The drive unit 210 and the mating part 310 are connected. The mounting housing 100 can drive the valve stem assembly 300 to rotate axially around the pressure relief valve 20. When the valve stem assembly 300 rotates, the drive unit 210 moves the valve stem assembly 300 axially along the pressure relief valve 20 through the mating part 310.

[0054] Specifically, the drive unit 210 can be a drive column disposed inside the drive housing 200, and the mating part 310 can be a spiral groove formed on the outer wall surface of the valve stem assembly 300. The spiral groove extends spirally along the axial direction of the pressure relief valve 20 on the outer wall surface of the valve stem assembly 300, and the drive unit 210 is engaged in the spiral groove. Therefore, when the valve stem assembly 300 is rotated, the drive unit 210 slides in the spiral groove. Since the drive housing 200 is abutted between the mounting housing 100 and the valve plate assembly 500 by the first elastic member 400, the drive housing 200 cannot move. Therefore, when the drive unit 210 slides in the spiral groove, the drive unit 210 drives the valve stem assembly 300 to move axially along the pressure relief valve 20, thereby changing the pressure of the bottom end 302 of the valve stem assembly 300 against the valve plate assembly 500, thereby controlling the opening and closing of the valve plate assembly 500 and the degree of opening. For example, when the bottom end 302 of the valve stem assembly 300 presses against the valve plate assembly 500, closing the valve plate assembly 500, the gas in the anesthesia machine 10 cannot escape, thus maintaining the gas pressure and ensuring that the gas in the anesthesia machine 10 can be smoothly delivered to the user. However, when the gas pressure in the anesthesia machine 10 is too high and poses a safety hazard to the user, pressure relief is required. In this case, the valve stem assembly 300 can be rotated, causing it to move away from the valve plate assembly 500 under the action of the drive unit 210. At this time, the force of the bottom end 302 of the valve stem assembly 300 pressing against the valve plate assembly 500 decreases, and the gas pressure inside the anesthesia machine 10 will force the valve plate assembly 500 open, allowing the gas in the anesthesia machine 10 to flow out through the valve plate assembly 500, thereby reducing the gas pressure inside the anesthesia machine 10 and ensuring the user's safety.

[0055] Those skilled in the art will also understand that the opening degree of the valve plate assembly 500 can be controlled by controlling the distance the valve stem assembly 300 moves toward the side opposite to the valve plate assembly 500, thereby precisely controlling the gas pressure in the anesthesia machine 10. Specifically, the greater the distance the bottom end 302 of the valve stem assembly 300 moves toward the mounting housing 100, the greater the opening degree of the valve plate assembly 500 can be, and the stronger the pressure relief effect. Conversely, the smaller the distance, the weaker the pressure relief effect. Those skilled in the art can determine the distance the valve stem assembly 300 moves according to actual needs, that is, control the opening degree of the valve plate assembly 500 according to actual conditions.

[0056] Those skilled in the art will also understand that the driving part 210 may be a helical groove provided on the driving housing 200, and the mating part 310 may be a driving column provided on the valve stem assembly 300. Of course, the driving part 210 may also include an internal thread provided within the driving housing 200, and the mating part 310 may also include an external thread provided on the outer wall surface of the valve stem assembly 300, etc. In other words, the function of the driving part 210 and the mating part 310 is to convert rotational motion into linear motion. Those skilled in the art may also use other structures, and the embodiments of this application do not impose specific limitations. The working principle can be referred to the above description, and will not be repeated here.

[0057] In some embodiments, reference Figure 2 and Figure 3 The mounting housing 100 includes a valve cap 110 and a housing 120, which are axially connected along the pressure relief valve 20. The housing 120 is fitted onto the drive housing 200. The top end 301 of the valve stem assembly 300 faces the valve cap 110. The valve cap 110 is provided with a first connecting member 111, and the top end 301 of the valve stem assembly 300 is provided with a second connecting member 320. The second connecting member 320 is connected to the first connecting member 111 so that the valve cap 110 can drive the valve stem assembly 300 to rotate axially around the pressure relief valve 20, and so that the valve stem assembly 300 can move relative to the valve cap 110 along the axial direction of the pressure relief valve 20.

[0058] It is understood that the housing 120 is mounted on the rack, that is, the mounting surface 102 of the housing 100 is located on the side of the housing 120 closest to the rack. Specifically, the housing 120 can be mounted on the rack by bolts or the like, which is prior art and will not be described in detail in this application.

[0059] Those skilled in the art will understand that the valve cap 110 can rotate relative to the housing 120. It will also be understood that the valve cap 110 is easy to screw on after the pressure relief valve 20 is installed on the anesthesia machine 10. Therefore, in this embodiment, by screwing on the valve cap 110, the valve stem assembly 300 is rotated, thereby causing the valve stem assembly 300 to move axially along the pressure relief valve 20, which reduces the difficulty of operation for the user.

[0060] Specifically, in some embodiments, reference is made to Figure 4 and Figure 5 The first connector 111 is provided with a connecting hole 115, and the inner wall surface of the connecting hole 115 includes a first plane. (Reference) Figure 2 The second connecting member 320 is a columnar member. The outer wall surface of the columnar member includes a second plane. Both the first and second planes extend axially along the pressure relief valve 20. (Reference) Figure 3 The columnar member is inserted into the connecting hole 115, with the first plane and the second plane facing each other, so that the valve cap 110 can drive the valve stem assembly 300 to rotate axially around the pressure relief valve 20, and the valve stem assembly 300 can move relative to the valve cap 110 along the axial direction of the pressure relief valve 20. It is understood that the connecting hole 115 can be a triangular hole, square hole, pentagonal hole, hexagonal hole, or semi-circular hole, etc., and the first plane can be at least one inner surface of the triangular hole, square hole, hexagonal hole, or semi-circular hole. Correspondingly, the columnar member can be a triangular prism, square prism, pentagonal prism, hexagonal prism, or semi-circular prism, etc., and the second plane can be at least one outer surface of the triangular prism, square prism, hexagonal prism, or semi-circular prism. This structure is simple and provides reliable transmission. Of course, those skilled in the art can also set the first connecting member 111 to be a columnar member, and the second connecting member 320 to have a connecting hole 115, which will not be elaborated here. Of course, those skilled in the art will also understand that a spaced surface can be provided between the connection hole 115 and the columnar member so that the gas in the connection hole 115 can flow to the outside, thereby preventing changes in gas pressure in the connection hole 115 from hindering the movement of the columnar member, and thus ensuring that the valve stem assembly 300 moves smoothly along the axial direction of the pressure relief valve 20.

[0061] In some embodiments, reference Figure 2 and Figure 3 The top end 202 of the drive housing 200 faces the valve cap 110. The valve cap 110 has an extension 112 that extends into the housing 120. The extension 112 has a third connector 113, and the top end 202 of the drive housing 200 has a fourth connector 220. The valve cap 110 moves away from the valve plate assembly 500, and the third connector 113 and the fourth connector 220 are connected so that the valve cap 110 can drive the drive housing 200 away from the valve plate assembly 500, so that the drive part 210 drives the valve stem assembly 300 away from the valve plate assembly 500 through the mating part 310.

[0062] It is understandable that when the gas pressure in the anesthesia machine 10 is too high and endangers the safety of the user, it is necessary to quickly depressurize the gas in the anesthesia machine 10. At this time, turning the valve cap 110 will undoubtedly increase the depressurization time. Therefore, a rapid depressurization method is also provided in this embodiment.

[0063] Those skilled in the art will understand that during normal use of the pressure relief valve 20, there is a gap between the third connector 113 and the fourth connector 220, and the distance between the third connector 113 and the valve plate assembly 500 is greater than the distance between the fourth connector 220 and the valve plate assembly 500. Because of the gap between the brackets of the third connector 113 and the fourth connector 220, no frictional resistance is generated between the third connector 113 and the fourth connector 220 during the fine-tuning of the valve plate assembly 500 by turning the valve cap 110, thus facilitating the turning of the valve cap 110. When rapid pressure relief is required, the valve cap 110 can be pulled away from the valve plate assembly 500. At this time, the valve cap 110 moves rapidly away from the valve plate assembly 500. During this process, the third connector 113 moves closer to the fourth connector 220 until it abuts against the fourth connector 220. When the valve cap 110 assembly is further pulled, the third connector 113 will drive the fourth connector 220 to move away from the valve plate assembly 500. Since the fourth connector 220 is integrated with the drive housing 200, the fourth connector 220 will drive the drive housing 200 to move away from the valve plate assembly 500. The drive part 210 in the drive housing 200 is engaged in the mating part 310 of the valve stem assembly 300. Thus, the drive housing 200 can drive the valve stem assembly 300 to move away from the valve plate assembly 500 through the drive part 210, thereby causing the bottom end 302 of the valve stem assembly 300 to quickly disengage from the valve plate assembly 500, thereby achieving rapid pressure relief.

[0064] Those skilled in the art will understand that during the rapid pressure relief process of lifting the valve cap 110 and moving the drive housing 200 away from the valve plate assembly 500, the first elastic element 400 is compressed. After the rapid pressure relief is completed, the elastic force generated by the recovery deformation of the first elastic element 400 can press the drive housing 200 back against the valve plate assembly 500, thus allowing the pressure relief valve 20 to enter the normal pressure relief mode. In other words, the pressure relief valve 20 provided in this embodiment has both conventional pressure relief and rapid pressure relief functions, and the two functions can be switched at any time.

[0065] Those skilled in the art will also understand that, in the embodiments of this application, the drive housing 200 and the mounting housing 100 can be assembled into a whole and then installed on the anesthesia machine 10, which can facilitate the installation of the pressure relief valve 20.

[0066] For details, please refer to Figure 4 and Figure 5The third connector 113 is a boss located on the side of the extension 112 near the valve plate assembly 500 and facing the valve stem assembly 300. It is understood that the boss can surround the peripheral wall of the extension 112. Multiple fourth connectors 220 may be included, circumferentially disposed at the top end 202 of the drive housing 200, with gaps between them. The surface of the fourth connector 220 that contacts the third connector 113 may be a plane, and the surface of the fourth connector 220 facing the extension 112 may be an inclined surface.

[0067] The assembly of the drive housing 200 and the mounting housing 100 will be described in detail below. First, the valve stem assembly 300 is assembled onto the drive housing 200. By screwing the valve stem assembly 300, the mating part 310 of the valve stem assembly 300 mates with the driving part 210 of the drive housing 200, thereby installing the valve stem assembly 300 onto the drive housing 200. At this time, attention should be paid to the distance between the bottom end 302 of the valve stem assembly 300 and the bottom end 203 of the drive housing 200 to ensure that after the drive housing 200 presses against the valve plate assembly 500, the valve stem assembly 300 can just close the valve plate assembly 500. After the assembly of the valve stem assembly 300 and the drive housing 200 is completed, the first elastic member 400 is sleeved on the outer peripheral wall of the drive housing 200, with one end of the first elastic member 400 contacting the second stepped surface 201. Next, the top end 202 of the drive housing 200 is inserted into the mounting housing 100. At this time, the other end of the first elastic member 400 contacts the first stepped surface 101. As the drive housing 200 is further inserted, the first elastic member 400 is compressed. During this process, the inclined surface of the fourth connector 220 contacts the outer wall surface of the third connector 113. The fourth connector 220 deforms towards the valve stem assembly 300. It can be understood that the fourth connector 220 has a certain elasticity, and since there is a gap between the fourth connectors 220, it will not hinder the deformation of the fourth connector 220. As the drive housing 200 is inserted, until the contact surface of the fourth connector 220 contacts the contact surface of the third connector 113 under the action of the rebound force, the assembly of the pressure relief valve 20 is completed. Obviously, under the action of the first elastic element 400, the third connecting element 113 and the fourth connecting element 220 form a locking structure, which means that the mounting shell 100 and the drive shell 200 are relatively fixed, preventing the drive shell 200 and the valve stem assembly 300 from falling out of the mounting shell 100, thereby ensuring the safety of the pressure relief valve 20 during transportation. It can be understood that the first distance is greater than the second distance at this time.

[0068] When the pressure relief valve 20 needs to be installed on the anesthesia machine 10, the drive housing 200 contacts the valve plate assembly 500. At this time, there is still a gap between the mounting surface 102 of the mounting housing 100 and the bearing surface of the frame. When the mounting housing 100 is further installed on the frame, the first elastic element 400 is compressed. At the same time, the drive housing 200 moves upward relative to the mounting housing 100, that is, the drive housing 200 moves towards the valve cap 110, thereby separating the third connecting member 113 from the fourth connecting member 220. In other words, after the pressure relief valve 20 is installed on the anesthesia machine 10, the first elastic element 400 is further compressed. Through the rebound force of the first elastic element 400, the drive housing 200 presses against the valve plate assembly 500. At the same time, the fourth connector 220 on the drive housing 200 separates from the third connector 113 on the valve cap 110, that is, the third connector 113 and the fourth connector 220 are released from engagement. At this time, when the valve cap 110 rotates and drives the valve stem assembly 300 to rotate, the fourth connector 220 on the drive housing 200 will not rub against the third connector 113 on the valve cap 110, thereby ensuring that the valve cap 110 rotates smoothly.

[0069] Obviously, assembling the mounting housing 100, drive housing 200 and valve stem assembly 300 into one unit facilitates transportation and installation.

[0070] In some embodiments, reference Figure 6 , Figure 7 and Figure 8 The outer casing 120 includes a first casing 121 and a second casing 122. Along the axial direction of the pressure relief valve 20, the valve cap 110, the first casing 121, and the second casing 122 are connected sequentially. The second casing 122 is used for fixed connection with the frame. The end of the first casing 121 facing the second casing 122 has a mounting groove 123, and the end of the second casing 122 facing the first casing 121 has a mating surface 124. Alternatively, the end of the second casing 122 facing the first casing 121 has a mounting groove 123, and the end of the first casing 121 facing the second casing 122 has a mating surface 124. In this embodiment, it is preferable to provide the mounting groove 123 on the second casing 122 and the mating surface 124 on the first casing 121. Those skilled in the art will understand that the first casing 121 and the second casing 122 can be snap-fitted together; this is prior art and will not be described further in this embodiment.

[0071] The mating surface 124 is recessed with a mating groove 125. A detection element 126 and a tactile elastic element 127 are disposed within the mounting groove 123. The valve cap 110 can drive the first housing 121 to rotate axially around the pressure relief valve 20. When the first housing 121 rotates until the mounting groove 123 and the mating groove 125 are misaligned, the two ends of the tactile elastic element 127 abut against the detection element 126 and the mating surface 124, respectively. When the first housing 121 rotates until the mounting groove 123 and the mating groove 125 are connected, the tactile elastic element 127 drives the detection element 126 to extend into the mating groove 125, and the detection element 126 contacts the inner wall of the mating groove 125 to detect the position of the first housing.

[0072] Specifically, the detection element 126 can be a small metal ball. When the small metal ball contacts the inner wall of the mating groove 125, it collides and emits a warning sound. (Refer to...) Figure 6 , Figure 7 and Figure 8The mating surface 124 has multiple mating grooves 125 evenly spaced circumferentially. Each of these grooves 125 can mate with the mounting groove 123 by rotating around the axial direction of the pressure relief valve 20. It is understood that the tactile elastic element 127 can be a spring, and the detection element 126 can be a small metal ball. The tactile elastic element 127 is placed in the mounting groove 123, and the detection element 126 is located above it. Initially, the detection element 126 protrudes from the mounting groove 123. More preferably, the portion of the detection element 126 protruding from the mounting groove 123 is less than half the size of the detection element 126, more preferably less than one-third, and in this embodiment, preferably less than one-fifth of the size of the detection element 126. The mating groove 125 is a spherical groove, and its size is adapted to the protruding portion of the detection element 126. In other words, when the mating groove 125 corresponds to the mounting groove 123, part of the detection element 126 is located in the mating groove 125. When the first shell 121 is rotated, the edge of the mating groove 125 presses against the detection element 126, causing the detection element 126 to sink into the mounting groove 123. Simultaneously, the tactile elastic element 127 deforms. When the first shell 121 rotates to the next mating groove 125 corresponding to the mounting groove 123, the tactile elastic element 127 recovers its deformation, pushing the detection element 126 into the mating groove 125. The detection element 126 touches the inner wall of the mating groove 125, triggering a beep to indicate the amount of rotation to the user. Those skilled in the art will understand that the axial movement of the valve stem assembly 300 along the pressure relief valve 20 can be calculated based on the angle between adjacent mating grooves 125, thereby precisely controlling the opening degree of the valve plate assembly 500. Therefore, those skilled in the art can mark the positions of the mating grooves 125 to facilitate user awareness of the opening degree of the valve plate assembly 500. Of course, those skilled in the art will also understand that a spring switch can be provided on the inner wall of each mating groove 125, and an LED light can be provided on the outer peripheral wall of the first housing 121. Each LED light corresponds to a mating groove 125. When the detection element 126 contacts the inner wall of the mating groove 125, the spring switch is pressed, causing the LED light to illuminate, thus providing a more significant indication of the rotational position of the first housing 121 to the user and preventing accidental operation. Obviously, the LED light also requires a power supply, wiring, etc., which is prior art and will not be described further in this embodiment.

[0073] It will be understood by those skilled in the art that reference Figure 6 and Figure 8During use, the valve assembly 500 of the anesthesia machine 10 should not be opened too wide. To prevent user misoperation, in this embodiment, a limiting platform 128 is provided on the side of the second shell 122 facing the first shell 121, and a blocking post 129 is provided on the inner wall of the first shell 121. It can be understood that the blocking post 129 can be a column protruding from the mating surface 124 facing the valve stem assembly 300. When the first shell 121 is rotated until the blocking post 129 contacts the limiting platform 128, the limiting platform 128 will prevent the first shell 121 from rotating further, thus preventing misoperation. It can also be understood that two blocking posts 129 can be provided, with the mating groove 125 located between the two blocking posts 129. Specifically, those skilled in the art can set the blocking post 129 according to the opening degree of the valve assembly 500; this embodiment does not impose specific limitations.

[0074] In some embodiments, reference Figure 9 The first housing 121 has a connecting groove 130, and the valve cap 110 has an extension 112 that extends into the first housing 121. The extension 112 has a connecting protrusion 114. Alternatively, the extension 112 has a connecting groove 130, and the first housing 121 has a connecting protrusion 114. In this embodiment, it is preferred to provide a connecting groove 130 in the first housing 121 and a connecting protrusion 114 on the extension 112 of the valve cap 110.

[0075] Both the connecting groove 130 and the connecting protrusion 114 extend axially along the pressure relief valve 20. The connecting protrusion 114 extends into the connecting groove 130 so that the valve cap 110 can drive the first housing 121 to rotate, and also allows the valve cap 110 to move away from the first housing 121. Clearly, the connecting protrusion 114 and the connecting groove 130 form a keyway structure. Therefore, when the valve cap 110 is rotated, the keyway structure formed by the connecting protrusion 114 and the connecting groove 130 can drive the first housing 121 to rotate together, thereby causing different mating grooves 125 to contact the detection element and emit a warning sound. Furthermore, the keyway structure ensures that the first housing 121 does not obstruct the movement of the valve cap 110 along the axial direction of the pressure relief valve 20, thus enabling rapid pressure relief.

[0076] In some embodiments, reference Figure 3 The mounting housing 100 also includes an outer appearance component 140, which is fitted onto the outer housing 120. The outer appearance component 140 covers the gap between the first housing 121 and the second housing 122, and is fixedly connected to either the first housing 121 or the second housing 122. Specifically, the outer appearance component 140 can be fastened to the second housing 122, which is prior art and will not be described in detail in this embodiment. In this embodiment, by providing the outer appearance component 140, dust can be prevented from entering the pressure relief valve 20, extending the service life of the pressure relief valve 20 and improving its aesthetics.

[0077] In some embodiments, reference Figure 3 The mounting housing 100 also includes a decorative cover 150, which is fastened to the valve cap 110 to prevent dust and other contaminants from entering the valve cap 110 and to improve the appearance of the pressure relief valve 20.

[0078] In some embodiments, reference Figure 10 The valve stem assembly 300 includes a first valve stem 330, a second valve stem 340, and a second elastic member 350. The first valve stem 330 has a first cavity 331, and the second valve stem 340 has a second cavity 341. A portion of the second valve stem 340 extends into the first cavity 331, and the first cavity 331 and the second cavity 341 are connected. The second elastic member 350 is disposed in the first cavity 331 and the second cavity 341, and its two ends abut against the bottom surfaces of the first cavity 331 and the second cavity 341, respectively. It is understood that the outer wall surface of the second valve stem 340 is a stepped surface, and the inner wall surface of the first valve stem 330 has a retaining ring groove. When the second valve stem 340 extends into the first cavity 331 of the first valve stem 330, a stop member 360 can be placed in the retaining ring groove. The stop member 360 abuts against the stepped surface on the outer wall surface of the second valve stem 340, preventing the second valve stem 340 from falling out of the first cavity 331. It is understood that the stop 360 can be an O-ring, or an O-ring with a square cross-section. In this way, the stop 360 can be placed in the retaining ring groove beforehand, and then the second valve stem 340 can be inserted into the first cavity 331. Utilizing the elasticity of the O-ring, the second valve stem 340 can smoothly extend into the first cavity 331. Of course, those skilled in the art can also use other structures, such as creating a threaded hole in the second valve stem 340 and using a set screw to screw it into the first cavity 331 to achieve obstruction. This application does not impose specific limitations on the embodiments.

[0079] The end of the first valve stem 330 away from the second valve stem 340 is the top end 301 of the valve stem assembly 300, and the end of the second valve stem 340 away from the first valve stem 330 is the bottom end 302 of the valve stem assembly 300. A mating part 310 is disposed on the outer wall surface of the first valve stem 330. The mounting housing 100 can drive the first valve stem 330 to rotate. When the first valve stem 330 rotates, the driving part 210 moves the first valve stem 330 away from or towards the second valve stem 340 through the mating part 310, thereby changing the elastic force of the second elastic member 350, and thus changing the force of the valve stem assembly 300 abutting against the valve plate assembly 500. Specifically, when the valve cap 110 is turned, causing the first valve stem 330 to move away from the second valve stem 340, the distance between the bottom wall of the first cavity 331 and the bottom plate of the second cavity 341 increases. This means the pressure on the second elastic element 350 decreases, which in turn reduces the pressure exerted by the second elastic element 350 on the second valve stem 340, resulting in a smaller force exerted by the second valve stem 340 against the valve plate assembly 500. Consequently, the opening degree of the valve plate assembly 500 increases. Conversely, when the valve cap 110 is turned, causing the first valve stem 330 to move closer to the second valve stem 340, the distance between the bottom walls of the first cavity 331 and the second cavity 341 decreases. This means the force exerted by the first valve stem 330 on the second elastic element 350 increases, leading to an increased force exerted by the second elastic element 350 on the second valve stem 340. This, in turn, increases the force exerted by the second valve stem 340 on the valve plate assembly 500, resulting in a decreased opening degree of the valve plate assembly 500. In other words, in this embodiment of the application, by turning the valve cap 110, the relative position of the first valve stem 330 and the second valve stem 340 can be changed, thereby realizing the adjustment of the opening degree of the valve plate assembly 500.

[0080] It is understood that the second elastic element 350 can be a spring. In this embodiment, the valve stem assembly 300 is divided into a first valve stem 330 and a second valve stem 340, which are connected by the second elastic element 350. Therefore, the second valve stem 340 and the first valve stem 330 can move relative to each other along the axial direction of the pressure relief valve 20. Through the second elastic element 350, the bottom of the second valve stem 340, that is, the bottom end 302 of the valve stem assembly 300, can be dynamically adjusted. Therefore, when the drive housing 200 presses against the valve plate assembly 500, the valve stem assembly 300 can ensure that the bottom end 302 of the valve stem assembly 300 presses against the valve plate assembly 500 through adaptive adjustment, further improving the applicability of the pressure relief valve 20, reducing the installation progress requirements of the pressure relief valve 20, and increasing the interchangeability of the pressure relief valve 20.

[0081] In some embodiments, reference Figure 10The bottom end 302 of the valve stem assembly 300 is provided with an air hole 342, which penetrates the inner wall surface and the outer wall surface of the second valve stem 340. This ensures that the pressure in the first chamber 331 and the second chamber 341 is consistent with the external pressure, thereby preventing pressure changes in the first chamber 331 and the second chamber 341 from affecting the axial movement of the second valve stem 340 along the pressure relief valve 20. Furthermore, the air hole 342 also suppresses resonance in the valve plate assembly 500.

[0082] In some embodiments, reference Figure 1 , Figure 11 and Figure 12 The valve assembly 500 includes a mounting base 510, a diaphragm 520, a valve plate 530, and a fixing member 540. The mounting base 510 includes a mounting plate 511, a support frame 512, and a pressure relief pipe 513. Both the mounting plate 511 and the pressure relief pipe 513 are fixed to the support frame 512. One side surface of the mounting plate 511 is used to abut against the bottom end 203 of the drive housing 200. The pressure relief pipe 513 is located on the side of the mounting plate 511 away from the bottom end 203 of the drive housing 200. The outlet 515 of the pressure relief pipe 513 faces the mounting plate 511, and the inlet 514 of the pressure relief pipe 513 is used to communicate with the breathing airway of the anesthesia machine 10. The diaphragm 520 and the valve plate 530 are both disposed between the pressure relief pipe 513 and the mounting plate 511. The diaphragm 520 is fixed to the support frame 512. Valve plate 530 is fixed to diaphragm 520 by fastener 540, and valve plate 530 covers the air outlet 515 of pressure relief pipe 513. Fastener 540 is provided with contact portion 541, which penetrates diaphragm 520 and mounting plate 511 and extends to the side of mounting plate 511 facing valve stem assembly 300. Contact portion 541 is used to abut against bottom end 302 of valve stem assembly 300.

[0083] In some embodiments, the fixing member 540 further includes a guide portion 542, which is located on the side of the fixing member 540 away from the contact portion 541, and contacts the outer wall surface of the pressure relief pipe 513. When the force of the bottom end 302 of the valve stem assembly 300 abutting against the contact portion 541 changes, the diaphragm 520 can deform, and the guide portion 542 moves along the outer wall surface of the pressure relief pipe 513. The guide portion 542 includes three claws, and the fixing member 540 is circular, with the three claws arranged at equal intervals around the center of the circle containing the fixing member 540. All three claws are in contact with the outer wall surface of the pressure relief pipe 513.

[0084] Specifically, when the valve cap 110 is turned so that the first valve stem 330 moves away from the second valve stem 340, the pressure applied to the second valve stem 340 by the second elastic element 350 decreases, the force of the second valve stem 340 against the valve plate assembly 500 decreases, the valve plate 530 moves away from the outlet 515, the valve plate 530 drives the diaphragm 520 to deform upward through the fixing element 540, and the guide part 542 moves upward along the outer wall of the pressure relief pipe 513. At this time, the amount of gas flowing out from the outlet 515 increases. When the valve cap 110 is turned, the first valve stem 330 moves closer to the second valve stem 340. The force exerted by the first valve stem 330 on the second elastic member 350 increases, and the force exerted by the second elastic member 350 on the second valve stem 340 increases. This increases the force exerted by the second valve stem 340 on the valve plate assembly 500, causing the valve plate 530 to move closer to the outlet 515. The valve plate 530 drives the diaphragm 520 to deform downward through the fixing member 540, and the guide part 542 moves downward along the outer wall of the pressure relief pipe 513. At this time, the amount of gas flowing out of the outlet 515 decreases.

[0085] refer to Figure 1 A second aspect of this application provides an anesthesia machine 10, including an expiratory airway and a pressure relief valve 20 as described above, wherein the pressure relief valve 20 is connected to the expiratory airway. Since the anesthesia machine 10 includes any of the aforementioned pressure relief valves 20, the anesthesia machine 10 also possesses the technical effects brought about by any of the aforementioned pressure relief valves 20.

[0086] The embodiments of this application have been described in detail above. Specific examples have been used in this article to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and central idea of ​​this application.

Claims

1. A pressure relief valve, characterized in that, include: Valve body assembly and valve stem assembly; The valve body assembly includes a mounting shell, a drive shell, and a first elastic element; the mounting shell has a first stepped surface inside; the outer wall surface of the drive shell has a second stepped surface; The drive housing is sleeved on the valve stem assembly, the mounting housing is sleeved on the drive housing, and the portion of the drive housing with the second stepped surface extends out of the mounting housing; the first elastic element is sleeved on the outer wall surface of the drive housing, and the two ends of the first elastic element abut against the first stepped surface and the second stepped surface, respectively; One end of the valve stem assembly extends out of one end of the drive housing and is connected to the mounting housing; the other end of the valve stem assembly and the other end of the drive housing are both used to abut against the valve plate assembly. The drive housing enables the valve stem assembly to move axially along the pressure relief valve, thereby driving the valve plate assembly to open and close. Under the elastic force of the first elastic element, the drive housing can move relative to the mounting housing along the axial direction of the pressure relief valve, keeping the drive housing in contact with the valve plate assembly.

2. The pressure relief valve according to claim 1, characterized in that, The drive housing is provided with a drive unit, and the outer wall surface of the valve stem assembly is provided with a mating part, and the drive unit and the mating part are connected; The mounting housing can drive the valve stem assembly to rotate axially around the pressure relief valve. When the valve stem assembly rotates, the driving part causes the valve stem assembly to move axially along the pressure relief valve through the mating part.

3. The pressure relief valve according to claim 2, characterized in that, The mounting housing includes a valve cap and a housing, which are connected axially along the pressure relief valve; The outer casing is fitted onto the drive housing; one end of the valve stem assembly connected to the mounting housing faces the valve cap, the valve cap is provided with a first connector, and the valve stem assembly is provided with a second connector; the second connector is connected to the first connector so that the valve cap can drive the valve stem assembly to rotate around the axial direction of the pressure relief valve, and so that the valve stem assembly can move relative to the valve cap along the axial direction of the pressure relief valve.

4. The pressure relief valve according to claim 3, characterized in that, The first connector is provided with a connecting hole, and the second connector is a columnar member; or, the first connector is a columnar member, and the second connector is provided with a connecting hole; The inner wall surface of the connecting hole includes a first plane, and the outer wall surface of the columnar member includes a second plane. Both the first plane and the second plane extend along the axial direction of the pressure relief valve. The columnar member is inserted into the connecting hole, with the first plane and the second plane facing each other, so that the valve cap can drive the valve stem assembly to rotate around the axial direction of the pressure relief valve, and the valve stem assembly can move relative to the valve cap along the axial direction of the pressure relief valve.

5. The pressure relief valve according to claim 3, characterized in that, The end of the drive housing that is protruding from the valve stem assembly faces the valve cap. The valve cap has an extension that extends into the housing. The extension has a third connector, and the drive housing has a fourth connector. The valve cap moves away from the valve plate assembly, and the third connector and the fourth connector are connected so that the valve cap can drive the drive housing away from the valve plate assembly, so that the drive part drives the valve stem assembly away from the valve plate assembly through the mating part.

6. The pressure relief valve according to claim 3, characterized in that, The housing includes a first housing and a second housing, and the valve cap, the first housing, and the second housing are connected in sequence along the axial direction of the pressure relief valve; the second housing is used for fixed connection with the frame. The first shell has a mounting groove at one end facing the second shell, and the second shell has a mating surface at one end facing the first shell; or, the second shell has a mounting groove at one end facing the first shell, and the first shell has a mating surface at one end facing the second shell; the mating surface is recessed with a mating groove. The mounting groove is equipped with a detection element and a tactile elastic element; the valve cap can drive the first shell to rotate axially around the pressure relief valve. When the first shell rotates to the point where the mounting groove and the mating groove are misaligned, the two ends of the tactile elastic element abut against the detection element and the mating surface, respectively; when the first shell rotates to the point where the mounting groove and the mating groove are connected, the tactile elastic element drives the detection element to extend into the mating groove, and the detection element contacts the inner wall surface of the mating groove to detect the position of the first shell.

7. The pressure relief valve according to claim 6, characterized in that, The first housing has a connecting groove, and the valve cap has an extension that extends into the first housing. The extension has a connecting protrusion. Alternatively, the extension has a connecting groove, and the first housing has a connecting protrusion. Both the connecting groove and the connecting protrusion extend along the axial direction of the pressure relief valve. The connecting protrusion extends into the connecting groove so that the valve cap can drive the first housing to rotate and move away from the first housing.

8. The pressure relief valve according to claim 2, characterized in that, The driving part includes a driving column disposed within the driving housing, and the mating part includes a helical groove disposed on the outer wall surface of the valve stem assembly; or... The drive unit includes a spiral groove disposed within the drive housing, and the mating part includes a drive post disposed on the outer wall surface of the valve stem assembly.

9. The pressure relief valve according to any one of claims 2 to 8, characterized in that, The valve stem assembly includes a first valve stem, a second valve stem, and a second elastic element. The first valve stem has a first cavity, and the second valve stem has a second cavity. A portion of the second valve stem extends into the first cavity, and the first cavity and the second cavity are in communication. The second elastic element is disposed within the first cavity and the second cavity, and its two ends abut against the bottom surface of the first cavity and the bottom surface of the second cavity, respectively. The end of the first valve stem away from the second valve stem protrudes from the drive housing, and the end of the second valve stem away from the first valve stem is used to abut against the valve stem assembly. The drive unit is disposed on the outer wall surface of the first valve stem. The mounting housing can drive the first valve stem to rotate. When the first valve stem rotates, the driving part causes the first valve stem to move away from or towards the second valve stem through the mating part, so as to change the elastic force of the second elastic element, thereby changing the force of the valve stem assembly against the valve plate assembly.

10. The pressure relief valve according to claim 9, characterized in that, The valve stem assembly and the valve plate assembly have an air hole at one end where they abut against each other. The air hole penetrates the inner wall of the second cavity and the outer wall of the second valve stem.

11. The pressure relief valve according to any one of claims 1 to 8, characterized in that, The valve plate assembly includes a mounting base, a diaphragm, a valve plate, and a fixing element; The mounting base includes a mounting plate, a support frame, and a pressure relief pipe. The mounting plate and the pressure relief pipe are both fixed to the support frame. One side surface of the mounting plate is used to abut against the drive housing, and the pressure relief pipe is located on the side of the mounting plate away from the drive housing. The air outlet of the pressure relief pipe faces the mounting plate, and the air inlet of the pressure relief pipe is used to communicate with the breathing airway of the anesthesia machine. Both the diaphragm and the valve plate are disposed between the pressure relief pipe and the mounting plate; the diaphragm is fixed to the support frame; the valve plate is fixed to the diaphragm by the fixing member, and the valve plate covers the air outlet of the pressure relief pipe; the fixing member is provided with a contact portion, the contact portion penetrates the diaphragm and the mounting plate, and extends to the side of the mounting plate facing the valve stem assembly, and the contact portion is used to abut against the valve stem assembly.

12. The pressure relief valve according to claim 11, characterized in that, The fastener is also provided with a guide portion, which is located on the side of the fastener away from the contact portion, and the guide portion is in contact with the outer wall surface of the pressure relief pipe; When the force exerted by the valve stem assembly against the contact portion changes, the diaphragm deforms, and the guide portion moves along the outer wall of the pressure relief pipe.

13. An anesthesia machine, characterized in that, It includes an expiratory airway and a pressure relief valve as described in any one of claims 1 to 12, wherein the pressure relief valve is connected to the expiratory airway.

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