CN107237906B - Pressure relief valve and medical instrument's gas circuit system - Google Patents
Pressure relief valve and medical instrument's gas circuit system Download PDFInfo
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- CN107237906B CN107237906B CN201710592166.0A CN201710592166A CN107237906B CN 107237906 B CN107237906 B CN 107237906B CN 201710592166 A CN201710592166 A CN 201710592166A CN 107237906 B CN107237906 B CN 107237906B
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- valve
- pressure relief
- valve core
- inner cavity
- air inlet
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- 230000000903 blocking effect Effects 0.000 claims abstract description 5
- 230000007246 mechanism Effects 0.000 claims description 25
- -1 polytetrafluoroethylene Polymers 0.000 claims description 8
- 230000007704 transition Effects 0.000 claims description 8
- 238000013016 damping Methods 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- 230000029058 respiratory gaseous exchange Effects 0.000 claims description 5
- 206010002091 Anaesthesia Diseases 0.000 claims description 4
- 229930040373 Paraformaldehyde Natural products 0.000 claims description 4
- 230000037005 anaesthesia Effects 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 4
- 229920006324 polyoxymethylene Polymers 0.000 claims description 4
- 230000003746 surface roughness Effects 0.000 claims description 4
- 239000004677 Nylon Substances 0.000 claims description 3
- 230000001788 irregular Effects 0.000 claims description 3
- 229920001778 nylon Polymers 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims 7
- 239000000203 mixture Substances 0.000 claims 1
- 230000005484 gravity Effects 0.000 abstract description 13
- 238000007789 sealing Methods 0.000 description 13
- 238000009434 installation Methods 0.000 description 9
- 239000007787 solid Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 230000001965 increasing effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000013013 elastic material Substances 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000003562 lightweight material Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000241 respiratory effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- 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
- F16K17/06—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 special arrangements for adjusting the opening pressure
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/20—Valves specially adapted to medical respiratory devices
- A61M16/208—Non-controlled one-way valves, e.g. exhalation, check, pop-off non-rebreathing valves
- A61M16/209—Relief valves
-
- 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
- F16K17/164—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side and remaining closed after return of the normal pressure
-
- 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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Mechanical Engineering (AREA)
- Pulmonology (AREA)
- Heart & Thoracic Surgery (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Emergency Medicine (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Safety Valves (AREA)
Abstract
The invention provides a pressure relief valve and a gas circuit system of a medical instrument, wherein the pressure relief valve comprises: the valve body is provided with a first inner cavity which is formed along the extending direction of the valve body, and an air inlet and an air outlet which are communicated with the first inner cavity; the valve core support piece is fixed in the first inner cavity along the extending direction of the valve body; and the valve core is connected with the valve core support piece through shaft hole clearance fit, the valve core can slide relative to the valve core support piece along the extending direction of the valve body, and the valve core is used for blocking the air inlet or enabling the air inlet to be communicated with the first inner cavity. The pressure relief valve provided by the invention solves the problem of low control precision caused by the influence of gravity of the valve core when the pressure relief valve with the valve core is horizontally installed in the prior art.
Description
Technical Field
The invention belongs to the field of valves, and particularly relates to a pressure relief valve and a gas circuit system of a medical instrument.
Background
The pressure relief valve is a safety valve arranged on the parts such as the pressure container or the valve pipeline, and when the pressure value of the pressure container or the valve pipeline exceeds the set value of the pressure relief valve, the pressure relief valve can be automatically opened to drain pressure, so that the pressure in the pressure container or the valve pipeline cannot be continuously increased, and the safety of the pressure container or the valve pipeline is ensured. When the pressure value in the pressure container or the valve pipeline is reduced to a certain value, the pressure relief valve is automatically closed again.
In medical instruments or other fields, pressure relief valves with smaller control pressure (usually, control pressure is in the range of 10-70 mbar) are often used, for example, the fields of pressure safety control for anesthesia machine breathing circuits, pressure safety control for breathing machine breathing circuits, circuit pressure safety control for respiratory resuscitation equipment and the like, and because the control pressure of the pressure relief valves in the fields is smaller, the requirements on control accuracy are higher.
At present, a spring type pressure relief valve is mainly adopted to control the pressure. The spring type pressure relief valve is generally provided with a spring and a solid valve core, when the pressure value of the gas outside the pressure relief valve reaches a certain value, the gas outside the pressure relief valve acts on the solid valve core of the pressure relief valve to enable the solid valve core to move and compress the spring, and at the moment, the movement of the solid valve core enables the pressure relief valve to be opened, and the gas outside the pressure relief valve is released from the pressure relief valve, so that the gas pressure value of the gas outside the pressure relief valve is prevented from being too high; when the air pressure value is reduced to a safe value, the compression spring can recover deformation so that the solid valve core returns to the initial position, and the spring type pressure relief valve is closed.
When the spring type pressure relief valve is horizontally installed, the entity valve core is downwards deflected under the action of gravity of the entity valve core, so that the spring type pressure relief valve is not opened or closed under actual set pressure and the control precision of the spring type pressure relief valve can be influenced. However, vertical mounting also presents some problems: on the one hand, for certain volume-limited medical devices, the vertical mounting makes the spring-type pressure relief valve occupy more operating space; on the other hand, this also restricts the range of use of the spring-type pressure relief valve.
Disclosure of Invention
The invention aims to provide a pressure relief valve, which aims to solve the problem of low control precision caused by the gravity action of a solid valve core when the pressure relief valve is horizontally installed in the prior art.
In order to solve the above technical problems, the present invention provides a pressure relief valve, including: the valve body is provided with a first inner cavity which is formed along the extending direction of the valve body, and an air inlet and an air outlet which are communicated with the first inner cavity; the valve core support piece is fixed in the first inner cavity along the extending direction of the valve body; and the valve core is connected with the valve core support piece through shaft hole clearance fit, the valve core can slide relative to the valve core support piece along the extending direction of the valve body, and the valve core is used for blocking the air inlet or enabling the air inlet to be communicated with the first inner cavity.
Further, the valve core supporting piece is provided with a second inner cavity which is formed along the extending direction of the valve core supporting piece, and a part of the valve core is arranged in the second inner cavity in a clearance fit mode through the shaft hole.
Further, the valve core is provided with a third inner cavity which is arranged along the extending direction of the valve core, and a part of the valve core supporting piece is arranged in the third inner cavity in a clearance fit way through the shaft hole.
Further, the pressure relief valve further includes an elastic element disposed within the first lumen; when the valve core slides in a direction away from the air inlet, the elastic element is compressed by the valve core, and the air inlet is communicated with the first inner cavity; when the elastic element is restored to deform, the valve core slides towards the direction close to the air inlet under the action of the elastic element and seals the air inlet.
Further, the valve body comprises a first valve cover, a valve casing and a second valve cover, one end of the valve casing is connected with the first valve cover, the other end of the valve casing is connected with the second valve cover, the first valve cover, the valve casing and the second valve cover enclose to form a first inner cavity, the air inlet is formed in the second valve cover and communicated with the first inner cavity, and the air outlet is formed in the side wall of the valve casing and communicated with the first inner cavity.
Further, the first valve cover is detachably connected with one end of the valve casing, and the second valve cover is detachably connected or integrally arranged with the other end of the valve casing.
Further, the pressure relief valve further comprises an elastic element and an adjusting mechanism for adjusting the deformation amount of the elastic element, wherein the adjusting mechanism penetrates through the first valve cover and is connected with the valve core supporting piece; the elastic element is arranged in the first inner cavity, two ends of the elastic element are respectively arranged on the adjusting mechanism and the valve core, when the valve core slides in a direction away from the air inlet, the elastic element is compressed by the valve core, and the air inlet is communicated with the first inner cavity; when the elastic element is restored to deform, the valve core slides towards the direction close to the air inlet under the action of the elastic element and seals the air inlet.
Further, the elastic element is a spring, the spring is sleeved on the valve core supporting piece and the valve core, and two ends of the spring are respectively arranged on the adjusting mechanism and the valve core.
Further, the case include the valve rod and set up in valve cap of valve rod one end, a part of valve rod pass through shaft hole clearance fit set up in the second inner chamber, another part of valve rod and the valve cap extends the second inner chamber, elastic element cover is located case support piece with on the valve rod, elastic element's one end set up in on the valve cap, the other end set up in on the adjustment mechanism, the valve cap be used for shutoff the air inlet or make the air inlet with communicate between the first inner chamber.
Further, the end part of the valve casing, which is close to the second valve cover, is provided with a connecting interface, two ends of the connecting interface are respectively communicated with the first inner cavity and the air inlet, and the valve cap is used for plugging the connecting interface or enabling the connecting interface to be communicated with the first inner cavity.
Further, a first annular protrusion is arranged on the interface between the first inner cavity and the connecting interface, the valve cap is a cylinder, the diameter of the first annular protrusion is larger than that of the connecting interface and smaller than that of the valve cap, and the valve cap is used for being in sealing contact with the first annular protrusion or being separated from the first annular protrusion and not in contact with the first annular protrusion.
Further, the adjusting mechanism comprises an adjusting part and a rotating part, one end of the adjusting part penetrates through the first valve cover and is mounted at one end of the rotating part, the other end of the rotating part is connected with the valve core supporting piece, a groove matched with the elastic element is formed in the other end of the rotating part, the other end of the elastic element is arranged in the groove, and the adjusting part is used for adjusting the rotating part to enable the rotating part to reciprocate back and forth along the axial direction of the valve body.
Further, the adjusting part comprises an adjusting damping ring and an adjusting rod, one end of the adjusting rod penetrates through the first valve cover and is installed at one end of the rotating part, and the adjusting damping ring is sleeved on the other end of the adjusting rod.
Further, the rotating portion is integrally provided with the spool support.
Further, the outer surface of the rotating part is provided with an external thread, the part, close to the first valve cover, of the first inner cavity is provided with an internal thread matched with the external thread, the length of the internal thread is larger than that of the external thread, the rotating part is in threaded connection with the valve body, and the adjusting part is used for adjusting the rotation of the rotating part.
Further, a hole is formed in a portion, close to one end, of the rotating portion, the shape and the size of one end of the adjusting portion are matched with those of the hole, the adjusting portion penetrates through the first valve cover and is arranged in the hole, and one end of the adjusting portion rotates to drive the rotating portion to rotate.
Further, the cross section of the hole is elliptical, regular polygon or irregular.
Furthermore, the valve core is made of one or more of polytetrafluoroethylene, nylon and polyoxymethylene.
Further, a surface roughness Rz value of a surface of the spool support in contact with the spool is less than 3.2 micrometers.
Further, the clearance value of the clearance fit of the shaft hole between the valve core and the valve core supporting piece is 0-0.15mm.
Further, the second inner cavity is a stepped cylinder and comprises a fourth inner sub-cavity which is far away from the air inlet along the extending direction of the valve body and a fifth inner sub-cavity which is close to the air inlet, the diameter of the fifth inner sub-cavity is larger than that of the fourth inner sub-cavity, and one part of the valve core is arranged in the fourth inner sub-cavity and the fifth inner sub-cavity through shaft hole clearance fit.
Further, a transition part is further included between the fifth sub-inner cavity and the fourth sub-inner cavity, and the diameter of the transition part gradually becomes smaller along the direction approaching to the fourth sub-inner cavity.
Further, a second annular protrusion is arranged on the part, away from the fourth sub-inner cavity, of the fifth sub-inner cavity, and the diameter of the second annular protrusion is equal to that of the fourth sub-inner cavity.
Further, a third annular protrusion is disposed on the outer surface of the valve core in the fifth sub-cavity, and the diameter of the third annular protrusion is larger than that of the second annular protrusion.
Further, the second annular projection and/or the third annular projection has elasticity.
The invention also provides a gas circuit system of the medical instrument, which comprises the pressure relief valve, wherein the pressure relief valve is horizontally arranged.
Further, the medical instrument system is an anesthesia machine or a breathing machine.
Compared with the prior art, the invention provides the pressure relief valve and the gas circuit system of the medical instrument, and the pressure relief valve effectively solves the problem of low control precision of the pressure relief valve with the valve core due to the influence of the gravity of the valve core in the horizontal installation process by arranging the valve core supporting piece, ensures that the pressure relief valve can be horizontally installed, saves more operation space for users, ensures that the operation control of the pressure relief valve is more in accordance with the common operation habit by horizontal installation, and can be applied to the medical instrument or other fields requiring high-precision control.
And secondly, the valve core is made of a light-weight self-wetting material (such as polytetrafluoroethylene), so that the influence of gravity can be further reduced, and the control accuracy of the pressure relief valve can be improved.
Furthermore, the second inner cavity of the valve core supporting piece adopts a high-finish inner surface (the surface roughness Rz value is smaller than 3.2 microns), so that the friction force between the valve core and the second inner cavity can be further reduced, and the control precision of the pressure relief valve in horizontal installation is improved.
In addition, the invention can quantitatively control the opening pressure of the pressure relief valve by arranging the adjusting mechanism.
Drawings
FIG. 1 is a schematic cross-sectional view of a pressure relief valve according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a pressure relief valve according to an embodiment of the present invention when a rotary part and a valve core support are integrally disposed;
FIG. 3 is a schematic view of an external appearance of a pressure relief valve according to an embodiment of the present invention;
reference numerals illustrate:
1-a valve body; 2-a spool support; 3-valve core; 4-an elastic element; 5-an adjusting mechanism; 6-an air inlet interface; 10-a first lumen; 101-internal threads; 11-air inlet; 12-exhaust port; 13-a first valve cover; 14-a valve housing; 141-a connection interface; 142-a first annular protrusion; 15-a second valve cover; 16-sealing rings; 20-a second lumen; 201-a fourth sub-lumen; 202-a fifth sub-lumen; 203-transition site; 204-a second annular protrusion; 30-a third lumen; 31-a valve cap; 32-a valve stem; 33-a third annular protrusion; 51-an adjusting part; 511-adjusting the damping ring; 512-adjusting the rod; 52-a rotating part; 521-grooves; 522-external threads; 523-holes.
Detailed Description
The following describes the pressure relief valve and the air path system of the medical apparatus in detail with reference to the drawings and the specific embodiments. Advantages and features of the invention will become more apparent from the following description and from the claims. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention. The same or similar reference numbers in the drawings refer to the same or similar parts.
Fig. 1 is a schematic view of a pressure relief valve according to an embodiment of the present invention. FIG. 2 is a schematic structural diagram of a pressure relief valve according to an embodiment of the present invention when a rotary part and a valve core support are integrally disposed; fig. 3 is an external view schematically illustrating a pressure relief valve according to an embodiment of the present invention. Referring to fig. 1 and 2 and fig. 3, a pressure relief valve includes a valve body 1, a spool support 2, and a spool 3; the valve body 1 is provided with a first inner cavity 10 which is arranged along the extending direction of the valve body 1, and an air inlet 11 and an air outlet 12 which are communicated with the first inner cavity 10; the valve core supporting piece 2 is fixed in the first inner cavity 10 along the extending direction of the valve body 1; the valve core 3 is connected with the valve core support 2 through shaft hole clearance fit, the valve core 3 can slide relative to the valve core support 2 along the extending direction of the valve body 1, and the valve core 3 is used for blocking the air inlet 11 or enabling the air inlet 11 to be communicated with the first inner cavity 10. In this embodiment, the valve body is cylindrical, the air inlet 11 may be disposed at one end of the valve body 1 in the axial direction, the air outlet 12 may be disposed on a side wall of the valve body 1 perpendicular to the axial direction thereof, and the air may enter the first inner cavity 10 from the air outlet 12 and then flow out of the first inner cavity 10 from the air outlet 12. In another embodiment, the valve body 10 may have other shapes, such as a cube or a hexagonal cylinder.
In this embodiment, the valve core 3 and the valve core support member 2 are connected in a shaft hole clearance fit, a gap is formed between the two, the valve core support member 2 can support the valve core 3, so that the valve core 3 can be placed along the extending direction of the valve body 1, when the pressure relief valve is horizontally placed, the valve core 3 can be horizontally placed with the support force provided by the valve core support member 2, the support force can offset the influence of gravity on the valve core 3, the downward deviation of the valve core caused by gravity is avoided, and the control precision of the pressure relief valve during horizontal installation is improved.
The valve core 3 is connected with the valve core support 2 in a clearance fit manner, that is, the valve core 3 is sleeved outside the valve core support 2, the valve core 3 is provided with a third inner cavity 30 arranged along the extending direction of the valve core 3, and a part of the valve core support 2 is arranged in the third inner cavity 30 in a clearance fit manner through the shaft hole. Preferably, the valve core support member 2 is sleeved outside the valve core 3, the valve core support member 2 has a second inner cavity 20 opened along the extending direction, and a part of the valve core 3 is arranged in the second inner cavity 20 through a shaft hole clearance fit. In this embodiment, the second solution is preferably adopted, the valve core support member 2 is sleeved on the outside of the valve core 3, so that a part of the valve core 3 can be accommodated in the valve core support member 2, so that the valve core support member 2 can better provide support for the valve core 3, and the gravity influence of the valve core 3 is reduced.
The valve body 1 may include a first valve cover 13, a valve housing 14 and a second valve cover 15, one end of the valve housing 14 is connected with the first valve cover 13, the other end of the valve housing 14 is connected with the second valve cover 15, the first valve cover 13, the valve housing 14 and the second valve cover 15 enclose to form the first inner cavity 10, the air inlet 11 is opened on the second valve cover 15 and is communicated with the first inner cavity 10, and the air outlet 12 is opened on a side wall of the valve housing 14 and penetrates through a side wall of the valve housing 141, so that the air outlet 12 is communicated with the first inner cavity 10. The first valve cover 13 is preferably detachably connected to one end of the valve housing 14, and the second valve cover 15 is preferably detachably connected to or integrally provided with the other end of the valve housing 14. Here, one end and the other end of the valve housing 14 refer to opposite ends in the extending direction of the valve housing 14.
The first valve cover 13 is detachably connected with the valve housing 14, and when the pressure relief valve is assembled, the first valve cover 13 is opened, and after the components in the first inner cavity 10 are installed, the first valve cover 13 and the valve housing 14 can be connected.
The number of the exhaust ports 12 may be one or more, for example, two symmetrical exhaust ports 12 are provided on the valve housing 14 (i.e., two exhaust ports 12 are symmetrically distributed along the radial direction of the valve housing 14), so that the gas in the first cavity 10 can be rapidly exhausted, and the sensitivity of the pressure relief valve is improved.
In this embodiment, the second valve cover 15 and the valve housing 14 may be connected by a screw, or may be detachably connected or integrally provided (i.e. they are integrally formed), however, the second valve cover 15 and the valve housing 14 may be connected in other manners, which is not limited in the present invention. Preferably, the second valve cover 15 and the valve housing 14 are all in sealing connection except for the part where the air inlet 11 is communicated with the first inner cavity 10, for example, a sealing ring 16 is arranged between the second valve cover 15 and the valve housing 14 to realize sealing connection, so that leakage of air from the air inlet 11 from the connection part of the second valve cover 15 and the valve housing 14 is prevented, and control accuracy of the pressure relief valve is prevented from being influenced.
In addition, in this embodiment, an air inlet port 6 communicating with the air inlet 11 may be installed at an end of the second valve cover 15 away from the valve housing 14, and the purpose of the air inlet port 6 is to facilitate the installation of an external air pipeline through the air inlet port 6 and a pressure relief valve.
In this embodiment, the pressure relief valve may further include an elastic element 4, where the elastic element 4 is disposed in the first inner cavity 10. The elastic element 4 may be disposed on the periphery of the valve core 3, and in this embodiment, the elastic element is disposed around the valve core 3, and two ends of the elastic element are disposed on the valve core 3 and a portion of the valve body 1 away from the air inlet 11, respectively.
When the valve element 3 slides in a direction away from the air inlet 11, the elastic element 4 is compressed by the valve element 3 and as the valve element 3 moves in a direction away from the air inlet 11, the air inlet 11 communicates with the first inner chamber 10; when the elastic element 4 returns to its deformed state, the valve element 3 slides in a direction approaching the air inlet 11 by the elastic element 4 and closes the air inlet 11. The elastic element 4 can provide a force for the valve core 3 when being compressed, the force counteracts the pressure of the gas at the gas inlet 11 provided for the valve core 3, and the valve core 3 is limited to move towards the direction away from the gas inlet 11 without limit; on the other hand, when the gas pressure at the gas inlet 11 decreases, the elastic member 4 may resume its shape to provide a pushing force to the valve element 3, pushing the valve element 3 to return to close the gas inlet 11. In another embodiment, the elastic element 4 may be disposed between the valve core 3 and the air inlet 11, and both ends thereof are disposed on the valve core 3 and a portion of the valve body near the air inlet 11, respectively.
With continued reference to fig. 1, the pressure relief valve may further include an adjustment mechanism 5 for adjusting the amount of deformation of the resilient member 4, the adjustment mechanism 5 extending through the first valve cover 13 and being coupled to the spool support 2. The elastic element 4 is respectively arranged on the adjusting mechanism 5 and the valve core 3. When the valve core 3 slides in a direction away from the air inlet 11, the elastic element 4 is compressed by the valve core 3, and the air inlet 11 is communicated with the first inner cavity 10; when the elastic element 4 recovers to deform, the valve core 3 slides towards the direction approaching the air inlet 11 under the action of the elastic element 4 and seals the air inlet 11, so that the air inlet 11 is not communicated with the first inner cavity 10 in a sealing way. The two ends of the elastic element 4 may be connected and fixed with the valve core 3 and the adjusting mechanism 5, or may be in a state of being not connected and fixed only in contact with the valve core 3 and the adjusting mechanism 5.
The adjusting structure 5 is arranged to adjust the initial deformation amount of the elastic element 4, so that the opening pressure of the pressure relief valve can be set according to the requirement, for example, when the elastic element 4 is compressed by the adjusting mechanism 5, the elastic element 4 applies pressure to the valve core 3 in the direction approaching the air inlet 11, so that the valve core 3 moves in the direction far away from the air inlet 11 only when the air inlet pressure of the air inlet 11 is greater than the pressure applied by the elastic element 4, so that the air inlet 11 is communicated with the first inner cavity 10, and because the first inner cavity 10 is communicated with the air outlet 12, the air is discharged through the air outlet 12, so that the work of opening the pressure relief valve for opening the pressure relief valve is completed, and therefore, the adjusting mechanism 5 is used to adjust the deformation amount of the elastic element 4, so that the opening pressure of the pressure relief valve is set.
As a non-limiting example, the elastic element 4 may be a spring, which is sleeved on the spool support 2 and the spool 3, and two ends of which are respectively disposed on the adjusting mechanism 5 and the spool 3. The pressure relief valve with the spring may be referred to as a spring-type pressure relief valve, and the spring-type pressure relief valve in this embodiment is provided with the spool support 2, and can achieve horizontal installation with high control accuracy. Compared with a pressure pilot type safety relief valve, the valve overall structure of the spring type pressure relief valve with the valve core is more compact and integrated, horizontal installation can be realized, and the advantages and the application range of the pressure relief valve with the solid valve core are increased.
The valve cartridge 3 may include a valve stem 32 and a bonnet 31 disposed at one end of the valve stem 32. Part of the valve rod 32 is arranged in the second inner cavity 20 through shaft hole clearance fit, the other part of the valve rod 32 and the valve cap 31 extend out of the second inner cavity 20, the elastic element 4 (such as a spring) is sleeved on the valve core support 2 and the valve rod 32, one end of the elastic element 4 (such as a spring) is arranged on the valve cap 31 and can be fixedly connected with the valve cap 31 or only in contact with the valve cap 31, the contact arrangement can enable the valve cap 31 to provide an acting force for the elastic element 4 to compress the elastic element, the other end of the elastic element is arranged on the adjusting mechanism 5, and the valve cap 31 is used for blocking the air inlet 11 or enabling the air inlet 11 to be communicated with the first inner cavity 10.
The bonnet 31 has, for example, a cylindrical structure, a rectangular structure, or a hexagonal structure, as long as sealing between the valve element 3 and the intake port 11 is achieved. The radial dimension of the valve cap 31 is larger than the radial dimension of the elastic member 4 (such as a spring) and the air inlet 11 so that the elastic member 4 can be brought into contact with the valve cap 31 and the elastic member 4 can be compressed by the valve cap 31 when the valve cap 31 is moved in a direction away from the air inlet 11, and at the same time, the valve cap 31 can completely close the air inlet 11 when the valve cap 31 is moved in a direction approaching the air inlet 11. It should be understood that the valve element 3 is not limited to a valve cap and valve stem structure, as long as the valve element 3 can seal the air inlet 31 and the valve element 3 is far away from the air inlet 31 to communicate the air inlet 31 with the first inner cavity 10, for example, the valve element 3 may be a separate cylindrical structure having a diameter larger than the radial width of the air inlet 11, and at the same time, an elastic element 4 (such as a spring) is connected to an end of the cylindrical valve element, so that the elastic element 4 can be compressed when the cylindrical valve element moves far away from the air inlet 11.
As a preferred solution, the valve core 3 in this embodiment may be hollow, so as to reduce the weight of the entire valve core 3, so that the influence of gravity factor on the valve core 3 when placed horizontally is further reduced.
Referring to fig. 1, a connecting port 141 is formed at an end of the valve housing 14 near the second valve cover 15, two ends of the connecting port 141 are respectively communicated with the first inner cavity 10 and the air inlet 11, and the valve cap 31 is used for plugging the connecting port 141 or communicating the connecting port 141 with the first inner cavity 10.
Specifically, the size of the bonnet 31 in this embodiment is greater than the size of the connection interface 141. When the valve body 3 slides in the extending direction (axial direction) of the valve body 1 toward the intake port 11, the bonnet 31 may cover and seal the connection port 141 so that the connection port 141 is not in sealing communication with the first inner chamber 10, so that the intake port 11 is also not in sealing communication with the first inner chamber 10; when the bonnet 31 is moved away from the air inlet 11, the connection interface 141 communicates with the first interior chamber 10, thereby also allowing communication between the air inlet 11 and the second interior chamber 10.
In this embodiment, the contact portion between the valve housing 14 and the second valve cover 15 may be made smaller by providing the connection port 141, so that the valve cap 31 of the valve core 3 may seal the air inlet 11 and the first inner cavity 10 only by plugging the connection port 141, which is beneficial to the sealing connection between the valve housing 14 and the second valve cover 15, and prevents the air in the air inlet 11 from leaking from the connection portion.
Wherein a first annular protrusion 142 may be provided at an interface between the first inner cavity 10 and the connection port 141, the first annular protrusion 142 having a diameter larger than that of the connection port 141 and smaller than that of the bonnet 31, and when the bonnet 31 is a cylinder, the first annular protrusion 142 has a diameter smaller than that of the bonnet 31. The bonnet 31 is configured to be in sealing contact with the first annular protrusion 142 or to be separated from contact with the first annular protrusion 142. The purpose of the first annular protrusion 142 is to seal the connection port 141 by only sealing contact between the valve core 3 and the first annular protrusion 142 when the valve core 3 seals the connection port 141, thereby reducing the contact area and further enhancing the sealing effect.
In this embodiment, the adjusting mechanism 5 may include an adjusting portion 51 and a rotating portion 52, and the adjusting portion 51 is configured to adjust the rotating portion 52 to reciprocate back and forth in the axial direction of the valve body 1. Specifically, one end of the adjusting portion 51 penetrates through the first valve cover 13 along the axial direction of the valve body 1 and is mounted at one end of the rotating portion 52, the other end of the rotating portion 52 is connected with the valve core supporting member 2, a groove 521 matching with the elastic element 4 is formed at the other end of the rotating portion 52, and the other end of the elastic element 4 is disposed in the groove 521. In this embodiment, the pressure is applied to the elastic element 4 by the forward movement of the rotating portion 52 (i.e., moving in the direction approaching the air inlet 11), so as to achieve the purpose of increasing the opening pressure of the pressure relief valve, and at the same time, when the rotating portion 52 is backward movement (i.e., moving in the direction separating from the air inlet 11), the elastic element 4 gradually recovers the deformation, so as to achieve the purpose of decreasing the opening pressure of the pressure relief valve.
The adjusting part 51 may further include an adjusting damping ring 511 and an adjusting rod 512, one end of the adjusting rod 512 is installed at one end of the rotating part 52 through the first valve cover 13, and the adjusting damping ring sleeve 511 is disposed at the other end of the adjusting rod 512.
In this embodiment, the rotating portion 52 and the spool support 2 are integrally formed, so that the structure is more compact. It should be noted that the rotation portion 52 and the spool support 2 are not limited to an integrated arrangement, but the rotation portion 52 and the spool support 2 may be connected together by a snap connection, welding, or the like, so as to achieve synchronous movement of the rotation portion 52 and the spool support 2.
As shown in fig. 1 and fig. 2, the outer surface of the rotating portion 52 is provided with an external thread 522, a portion of the first inner cavity 10 near the first valve cover 13 is provided with an internal thread 101 matched with the external thread 522, the length of the internal thread 101 is greater than that of the external thread 522, the rotating portion 52 is in threaded connection with the valve body 1, and the adjusting portion 51 is used for adjusting the rotation of the rotating portion 52. When the adjusting portion 51 is used for adjusting the rotation of the rotating portion 52, the external thread 522 and the internal thread 101 may be screwed or unscrewed in a matching manner, so as to realize the linear movement of the rotating portion 52 in the axial direction of the valve body 1, and since the groove 521 on the rotating portion 52 is disposed in contact with the elastic element 4, the linear movement of the rotating portion 52 may drive the elastic element 4 to compress or recover the deformation.
Referring mainly to fig. 2, a hole 523 is formed in a portion of the rotating portion 52 near one end thereof, a shape and a size of one end of the adjusting portion 51 are matched with those of the hole 523, one end of the adjusting portion 51 penetrates through the first valve cover 13 to enter the hole 523, and one end of the adjusting portion 51 rotates to drive the rotating portion 52 to rotate. The cross-sectional shape of the hole 523 is preferably elliptical, regular polygonal or irregular, and by providing the hole 523 and setting the cross-section of the hole 523 to be non-circular, when the adjusting portion 51 rotates, the rotation of the adjusting portion 51 will drive the rotation portion 52 to rotate due to the limitation of the shape of the hole 523.
In a preferred embodiment, the valve body 3 is made of a lightweight material having self-wettability. The smaller the mass of the valve core 3 is, the smaller the mass is influenced by gravity factors, and meanwhile, when the valve core has self-wetting property, the friction force between the valve core 3 and the valve core support piece 2 can be further reduced, so that the factor of external force interference is greatly reduced when the valve core moves, and the control precision of the pressure relief valve is improved. Typical materials with light weight and self-wettability are Polytetrafluoroethylene (PTFE), nylon and Polyoxymethylene (POM), and one or a combination of three materials can be used to make the valve core 3, and the valve core 3 is preferably made of polytetrafluoroethylene, and of course, other known materials with light weight and self-wettability can be used to make the valve core 3.
Further, the surface roughness Rz value of the surface of the spool support 2 in contact with the spool 3 is less than 3.2 μm. The surface of the valve core support piece 2, which is in contact with the valve core 3, is provided with a high-finish surface, so that the friction force between the valve core 3 and the valve core can be reduced, and the control accuracy of the pressure relief valve can be further improved.
The clearance value of the clearance fit of the shaft hole between the valve core 3 and the valve core support 2 is 0-0.15mm. The clearance value is set to be 0-0.15mm, so that the valve core supporting piece 2 can support the valve core 3 as much as possible on the basis of guaranteeing the machining precision, the valve core 3 is kept horizontal, the influence of gravity factors on the valve core 3 in the moving process is reduced, and the control precision of the pressure relief valve is improved.
Further, the second inner cavity 20 is preferably a stepped cylinder, which includes a fourth inner sub-cavity 201 along the extending direction of the valve body and away from the air inlet 11, and a fifth inner sub-cavity 202 near the air inlet 11, the diameter of the fifth inner sub-cavity 202 is larger than that of the fourth inner sub-cavity 201, and a part of the valve core 3 is disposed in the fourth inner sub-cavity 201 and the fifth inner sub-cavity 202 through shaft hole clearance fit. The second inner cavity 20 is provided with two parts, and the diameter of the fifth inner cavity 202 is larger than that of the fourth inner cavity 201, so as to further reduce the contact area between the valve core 3 and the second inner cavity 20, the valve core 3 arranged in the second inner cavity 20 is divided into two parts, one part of the valve core 3 is positioned in the fourth inner cavity 201 and is contacted with the fourth inner cavity, the fourth inner cavity 201 supports the valve core 3, the other part of the valve core is positioned in the fifth inner cavity 202, but the diameter of the fifth inner cavity 202 is larger than that of the fourth inner cavity 201 and the valve core 3, so that the valve core positioned in the fifth inner cavity 202 is in a suspended state, the contact area between the valve core 3 and the second inner cavity 20 is reduced, the friction force between the valve core 3 and the second inner cavity 20 is reduced, and the control accuracy of the pressure relief valve is improved.
In a preferred embodiment, a transition portion 203 is further included between the fifth sub-lumen 202 and the fourth sub-lumen 201, and the diameter of the transition portion 203 is gradually reduced in a direction approaching the fourth sub-lumen 201. The transition 203 is present to make the interface between the fifth sub-chamber 202 and the fourth sub-chamber 201 smoother, preventing the end of the valve element 3 from being affected by excessive resistance when it contacts the transition 203 during movement.
Wherein, a portion of the fifth sub-lumen 202 away from the fourth sub-lumen 201 is provided with a second annular protrusion 204, and a diameter of the second annular protrusion 204 is equal to a diameter of the fourth sub-lumen 201. The second annular protrusion 204 is used to support the valve core 3 in cooperation with the fourth sub-chamber 201, so that both ends of the valve core portion located in the second chamber 20 are supported.
In this embodiment, a third annular protrusion 33 matching the first annular protrusion 204 is disposed on the outer surface of the valve core 3 in the fifth sub-chamber 202, and the diameter of the third annular protrusion 33 is larger than the diameter of the second annular protrusion 204. The third annular protrusion 33 is used for limiting the valve core 3, so as to prevent the third annular protrusion 33 from being separated from the fifth sub-inner cavity 202, thereby controlling the distance that the valve core 3 moves towards the direction close to the air inlet 11, and preventing the valve core 3 from being separated from the fifth sub-inner cavity 202.
Referring to fig. 1 and 2, the second annular protrusion 204 and/or the third annular protrusion 33 are made of an elastic material. One or both of which are made of an elastic material, it is convenient to squeeze the third annular protrusion 33 into the fourth sub-lumen via the second annular protrusion 204 upon installation.
The invention also provides a gas circuit system of the medical instrument, which comprises the pressure relief valve, wherein the pressure relief valve is horizontally arranged. Wherein the medical instrument system is preferably an anesthesia machine or a respirator.
In summary, the invention provides a pressure relief valve, by arranging the valve core supporting piece, the problem of low control precision of the pressure relief valve with the valve core caused by the influence of the gravity of the valve core in the horizontal installation process is effectively solved, the pressure relief valve is ensured to be horizontally installed, more operation space can be saved for a user, and the horizontal installation also enables the operation control of the pressure relief valve to be more in accordance with the general operation habit, so that the pressure relief valve can be applied to medical instruments or other fields requiring high-precision control.
And secondly, the valve core is made of a light-weight self-lubricating material, so that the influence of gravity can be further reduced, and the control accuracy of the pressure relief valve can be improved.
Moreover, the surface of the valve core supporting piece, which is contacted with the valve core, adopts a high-finish surface, so that the friction force between the valve core and the valve core supporting piece can be further reduced, and the control precision of the pressure relief valve in horizontal installation is improved.
In addition, the invention can quantitatively control the opening pressure of the pressure relief valve by arranging the adjusting mechanism.
The above description is only illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims.
Claims (18)
1. A pressure relief valve for horizontal placement, comprising:
The valve body is provided with a first inner cavity which is formed along the extending direction of the valve body, and an air inlet and an air outlet which are communicated with the first inner cavity;
The valve core support piece is fixed in the first inner cavity along the extending direction of the valve body; and
The valve core is in clearance fit connection with the valve core support piece through a shaft hole, the valve core can slide relative to the valve core support piece along the extending direction of the valve body, and the valve core is used for blocking the air inlet or enabling the air inlet to be communicated with the first inner cavity;
The valve core support piece is provided with a second inner cavity which is arranged along the extending direction of the valve core support piece, and a part of the valve core is arranged in the second inner cavity in a clearance fit way through the shaft hole;
The second inner cavity is a stepped cylinder and comprises a fourth inner sub-cavity far away from the air inlet and a fifth inner sub-cavity close to the air inlet along the extending direction of the valve body, the diameter of the fifth inner sub-cavity is larger than that of the fourth inner sub-cavity, and one part of the valve core is arranged in the fourth inner sub-cavity and the fifth inner sub-cavity in a clearance fit mode through shaft holes;
A second annular protrusion is arranged on the part, far away from the fourth sub-inner cavity, of the fifth sub-inner cavity, and the diameter of the second annular protrusion is equal to that of the fourth sub-inner cavity; a transition part is further arranged between the fifth sub-inner cavity and the fourth sub-inner cavity, and the diameter of the transition part gradually becomes smaller along the direction approaching to the fourth sub-inner cavity;
The pressure relief valve further comprises a spring and an adjusting mechanism for adjusting the initial deformation amount of the spring; the adjusting mechanism is connected with the valve core supporting piece; the spring is arranged in the first inner cavity, the spring is sleeved on the valve core supporting piece and the valve core, two ends of the spring are respectively arranged on the adjusting mechanism and the valve core, when the valve core slides in the direction away from the air inlet, the spring is compressed by the valve core, and the air inlet is communicated with the first inner cavity; when the spring recovers deformation, the valve core slides towards the direction close to the air inlet under the action of the spring and seals the air inlet,
The regulating mechanism comprises a regulating part and a rotating part, wherein one end of the regulating part penetrates through the valve body and is installed at one end of the rotating part, the other end of the rotating part is connected with the valve core supporting piece, a groove matched with the spring is formed in the other end of the rotating part, the other end of the spring is arranged in the groove, the regulating part is used for regulating the rotating part to enable the rotating part to reciprocate along the axial direction of the valve body, an external thread is arranged on the outer surface of the rotating part, the first inner cavity is provided with an internal thread matched with the external thread, the length of the internal thread is larger than that of the external thread, the rotating part is in threaded connection with the valve body, and the regulating part is used for regulating the rotation of the rotating part.
2. The pressure relief valve according to claim 1 wherein said valve body comprises a first valve cover, a valve housing and a second valve cover, one end of said valve housing being connected to said first valve cover, the other end of said valve housing being connected to said second valve cover, said first valve cover, valve housing and second valve cover enclosing to form said first interior cavity, said air inlet opening in said second valve cover and communicating with said first interior cavity, said air outlet opening in said side wall of said valve housing and communicating with said first interior cavity.
3. A pressure relief valve according to claim 2 wherein said first valve cover is removably connected to one end of said valve housing and said second valve cover is removably connected to or integrally provided with the other end of said valve housing.
4. The pressure relief valve according to claim 2, wherein said adjustment mechanism extends through said first valve cover and is connected to said spool support.
5. The pressure relief valve according to claim 2 wherein said valve core comprises a valve stem and a valve cap disposed at one end of said valve stem, a portion of said valve stem is disposed in said second cavity by a shaft hole clearance fit, another portion of said valve stem and said valve cap extend out of said second cavity, said spring is disposed over said valve core support and said valve stem, one end of said spring is disposed on said valve cap, and the other end is disposed on said adjustment mechanism, said valve cap being adapted to block said air inlet or to allow communication between said air inlet and said first cavity.
6. A pressure relief valve according to claim 5 wherein the end of said valve housing adjacent said second valve cap has a connector port, said connector port communicating at both ends with said first interior cavity and said air inlet port, respectively, and said valve cap is adapted to seal or communicate between said connector port and said first interior cavity.
7. The pressure relief valve according to claim 6 wherein said first interior cavity has a first annular projection at an interface with said connection interface, said bonnet being cylindrical, said first annular projection having a diameter greater than a diameter of said connection interface and less than a diameter of said bonnet, said bonnet being adapted to sealingly contact or be separated from contact with said first annular projection.
8. The pressure relief valve according to claim 4 wherein said adjustment portion comprises an adjustment damping ring and an adjustment lever, one end of said adjustment lever being mounted to one end of said rotating portion through said first valve cover, said adjustment damping ring being sleeved on the other end of said adjustment lever.
9. The pressure relief valve according to claim 1 wherein said swivel is integrally provided with said spool support.
10. The pressure relief valve according to claim 4 wherein said rotating portion defines a hole adjacent one end thereof, said adjusting portion having one end shaped and sized to match said hole and extending through said first valve cover and disposed within said hole, said adjusting portion having one end rotatable for rotating said rotating portion.
11. A pressure relief valve according to claim 10 wherein said aperture has an oval, regular polygon or irregular cross-sectional shape.
12. The pressure relief valve according to claim 1 wherein said valve core is made of one or a mixture of polytetrafluoroethylene, nylon and polyoxymethylene.
13. The pressure relief valve according to claim 1 wherein a surface roughness Rz value of a surface of said spool support in contact with said spool is less than 3.2 microns.
14. The pressure relief valve according to claim 1 wherein the clearance value of the axial bore clearance fit between the spool and the spool support is 0-0.15mm.
15. The pressure relief valve according to claim 1 wherein a third annular protrusion is provided on an outer surface of said valve spool in said fifth subchamber, said third annular protrusion having a diameter greater than a diameter of said second annular protrusion.
16. A pressure relief valve according to claim 15, wherein said second annular projection and/or said third annular projection is resilient.
17. A pneumatic system for a medical device comprising the pressure relief valve of any one of claims 1-16, wherein the pressure relief valve is horizontally disposed.
18. The pneumatic circuit system of claim 17, wherein the medical device system is an anesthesia machine or a breathing machine.
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| CN201710592166.0A CN107237906B (en) | 2017-07-19 | 2017-07-19 | Pressure relief valve and medical instrument's gas circuit system |
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| CN201710592166.0A CN107237906B (en) | 2017-07-19 | 2017-07-19 | Pressure relief valve and medical instrument's gas circuit system |
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| CN107237906B true CN107237906B (en) | 2024-05-10 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108758038A (en) * | 2018-08-17 | 2018-11-06 | 上海宝亚安全装备股份有限公司 | A kind of respirator concealed safety valve gear |
| CN110594218B (en) * | 2019-07-15 | 2024-07-09 | 无锡市汉为液压气动有限公司 | Expansion valve core, hydraulic lock structure with expansion valve core and sealing method of hydraulic lock structure |
| CN114599904A (en) * | 2019-12-30 | 2022-06-07 | 深圳迈瑞生物医疗电子股份有限公司 | Pressure relief valve and anesthesia machine |
| ES1247466Y (en) * | 2020-04-15 | 2020-08-28 | Sant Joan De Deu Hospital | Valve for respirators |
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