CN218866370U

CN218866370U - Pressure regulating device

Info

Publication number: CN218866370U
Application number: CN202222971514.4U
Authority: CN
Inventors: 丁康; 陈佳; 董旻辉; 薛文俊
Original assignee: Shanghai Kanglulian Medical Technology Co ltd
Current assignee: Shanghai Kanglulian Medical Technology Co ltd
Priority date: 2022-11-08
Filing date: 2022-11-08
Publication date: 2023-04-14
Anticipated expiration: 2032-11-08

Abstract

The application provides a pressure regulating device, includes: a variable-volume chamber provided with a first passage through which the variable-volume chamber communicates with an external device, the variable-volume chamber expanding or contracting in accordance with the magnitude of the chamber pressure; and the limiting unit is coupled with the variable volume chamber, moves along with the expansion or contraction of the variable volume chamber and applies reverse acting force to the variable volume chamber at the same time, so that the cavity pressure of the variable volume chamber and the reverse acting force of the limiting unit tend to be balanced, and the external device tends to be in a constant pressure state.

Description

Pressure regulating device

Technical Field

The embodiment of the application relates to the technical field of measuring instruments and medical instruments, in particular to a pressure adjusting device.

Background

The pressure gauge is an instrument which takes an elastic element as a sensitive element and measures and indicates pressure, has a very common application range, and almost extends to all the fields of industrial processes and scientific researches, such as heat pipe networks, gasoline transmission, water and gas supply systems, vehicle maintenance and repair shops and the like.

The pressure indicating devices in the existing medical field only provide pressure indicating function. Taking the airway pressure indicating device as an example, in some application scenarios, a monitor cannot monitor the pressure indicating device all the time, and when the pressure of the detected environment is too high, the monitored person is continuously pressed, so that postoperative complications are caused; when the pressure of the detected environment is too low, the device is in an under-pressure state, and adverse effects such as aspiration of airway secretions can be caused. Interventional catheters with saccules or water sacs, such as laryngeal masks, trachea cannulas, tracheotomy cannulas and the like, pressurizing bandage and the like are urgently needed to be provided with a device which can buffer pressure within a certain range and has a pressure indicating function, so that the occurrence of unpredictable unexpected conditions, such as pressure fluctuation caused by the displacement of patients and the like, or the too large or too small air sac sealing pressure of laryngeal masks, trachea cannulas and tracheotomy cannulas due to other problems of device air tightness and the like, is reduced.

Therefore, a device capable of both pressure buffering and pressure indication is needed.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present application provides a pressure regulating device to overcome the above problems or at least partially solve the above problems.

The embodiment of the application provides a pressure regulating device, this pressure regulating device includes: a variable-volume chamber provided with a first passage through which the variable-volume chamber communicates with an external device, the variable-volume chamber expanding or contracting in accordance with the magnitude of the chamber pressure; and the limiting unit is coupled with the variable volume chamber, moves along with the expansion or contraction of the variable volume chamber and applies reverse acting force to the variable volume chamber at the same time, so that the cavity pressure of the variable volume chamber and the reverse acting force of the limiting unit tend to be balanced, and the external device tends to be in a constant pressure state.

Optionally, the pressure regulating device further comprises an indicator and an index region, the indicator being configured to indicate a corresponding index in the index region with the movement of the limiting unit; the restriction unit may generate opposing forces of at least two force values as the variable-volume chamber expands or contracts, each force value corresponding to a corresponding index in the index region.

Optionally, the restriction unit includes an elastic body disposed inside the variable volume chamber, and two ends of the elastic body are respectively connected to the inner wall of the variable volume chamber, so that the elastic body can be elongated or shortened along with the expansion or contraction of the variable volume chamber.

Optionally, the restriction unit is disposed outside the variable-volume chamber, and the pressure adjustment device further includes: a housing through which the first passage communicates with an external device; a movable unit connected to the variable-volume chamber and movable in a direction in which the variable-volume chamber expands or contracts; the restriction unit is connected to the movable unit and the housing, respectively; when the pressure of the external device is increased or decreased, the volume variable chamber expands or contracts, the limiting unit applies a reverse acting force to the volume variable chamber through the movable unit, so that the cavity pressure of the volume variable chamber and the reverse acting force of the limiting unit tend to be balanced, and the external device tends to be in a constant pressure state.

Optionally, the index area is disposed in the housing, and the index area includes a safety area and a warning area, and the indicator is disposed in the movable unit; when the counter acting force applied to the volume variable chamber by the limiting unit is within a preset range, the indicator falls in the safety area, and when the counter acting force applied to the volume variable chamber by the limiting unit exceeds the preset range, the indicator falls in the warning area.

Alternatively, the movable unit is provided with a rib, the housing is provided with a slide groove which is engaged with the rib, the rib is movable along the slide groove as the variable-volume chamber expands or contracts, and the slide groove restricts the movable unit so that the movable unit moves in the axial direction of the pressure regulating device.

Optionally, the rib comprises a first rib and two second ribs, and the sliding groove comprises a first sliding groove matched with the first rib and a second sliding groove matched with the two second ribs.

Optionally, the restriction unit comprises a variable force spring, the variable force spring being stretchable as the variable volume chamber expands or contracts to generate at least two constant force values of opposing forces and at least two non-constant force values of opposing forces applied to the variable volume chamber, each constant force value of opposing forces corresponding to a stroke greater than 0.

Optionally, the variable force spring includes an elastic rolling sheet, the rolling sheet is provided with an outer end portion and an inner diameter surface, the movable unit is provided with a first rotating shaft and a first groove, the first rotating shaft can rotate in the first groove, the outer end portion of the variable force spring is connected to the housing, and the inner diameter surface of the variable force spring is coupled to the first rotating shaft.

Optionally, the inner diameter surface of the variable force spring is in clearance fit, transition fit or interference fit with the outer surface of the first rotating shaft.

Optionally, the inner diameter surface of the variable force spring is provided with a second groove, the outer surface of the first rotating shaft is provided with a key structure, and the key structure is matched with the second groove.

Optionally, the restriction unit comprises a tension spring comprising a helical elastic coil, both ends of the coil being connected to the housing and the variable volume chamber, respectively.

Optionally, the limiting unit includes two magnets, and the same poles of the two magnets are oppositely disposed and fixed to the bottom of the housing and the bottom of the variable volume chamber, respectively.

Optionally, the limiting unit includes a first constant force spring and a second constant force spring, an inner diameter surface of the second constant force spring is coupled to the second rotating shaft, the movable unit is provided with a third groove and a pushing portion, and the housing is provided with a third sliding groove; the first constant force spring is matched with the third groove, and the outer end part of the first constant force spring is connected with the shell; the second constant force spring is matched with the pushing part, the outer end part of the second constant force spring is connected with the shell, the second rotating shaft can slide in the third sliding groove, and the third sliding groove is arranged below the pushing part.

Optionally, at least a portion of an outer circumference of the first constant force spring is rotatably limited in the third groove, and an inner diameter surface of the second constant force spring is fixedly connected with the second rotating shaft.

Optionally, the indicator is disposed on top of the movable unit and extends along the first plane.

Optionally, the housing comprises a cylindrical shell and a sealing cover sealably connected to the shell, the variable-volume chamber being connected to the sealing cover and to a top of the movable unit, respectively.

Optionally, the variable-volume chamber is selected from a bladder, a piston, or a combination thereof.

Optionally, when the external device is filled with gas, the housing is provided with a second channel, and the second channel is respectively communicated with the volume-variable chamber and the external gas.

Optionally, when the external device is filled with liquid, the housing is provided with a third channel and a fourth channel, the third channel communicates with the variable-volume chamber and the external liquid, respectively, and the fourth channel communicates with the variable-volume chamber and the atmosphere, respectively.

Compare and only provide pressure indicating action, non-pressure buffering action and pressure self-adaptation compensation or pressure release function in current medical airway pressure indicating device, the utility model discloses can provide the pressure buffering and the pressure compensation of variable pressure benchmark value, provide the selection that different demands kept off the position for the user.

The top of the movable unit is provided with an indicator extending along a first plane, and no indicator can easily cause pressure damage due to overlarge pressure because the top of the limiting groove of the pressure index indicating area of the shell is also a plane.

When a user needs to adjust the regulated reference value (even if the external device is stabilized at a specified pressure value or pressure range), the pressure of the external device needs to be changed, and the variable force spring can be switched to a corresponding gear position by pumping or injecting the same substance as the substance filled in the external device into the variable volume chamber, and moving the indicator to a target value or value range through the movable unit.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the embodiments of the present application, and other drawings can be obtained by those skilled in the art according to the drawings.

FIGS. 1A-1B are schematic diagrams of two embodiments of a pressure regulating device of the present application coupled to an external device;

FIG. 2A is an exploded view of a first embodiment of a pressure regulating device of the present application;

FIG. 2B is a schematic view of the rib of the movable unit engaging the slide groove of the housing in the first embodiment of the pressure regulating device of FIG. 2A;

FIG. 2C is an exploded schematic view of the pressure compensating structure of the embodiment of the pressure regulating device of FIG. 2A;

FIG. 2D is a schematic view showing a state where the movable unit of the pressure compensating structure shown in FIG. 2C is engaged with the restricting unit;

FIG. 2E is a schematic view of one embodiment of the first shaft and the variable force spring of the movable unit;

FIG. 2F is a top view of the mobile unit shown in FIG. 2C;

FIG. 2G is a schematic view of the variable-volume chamber of the embodiment of the pressure regulating device shown in FIG. 2A in a contracted state;

FIG. 2H is a schematic view of the variable-volume chamber of the embodiment of the pressure regulating device shown in FIG. 2A in an expanded state;

FIG. 3A is a schematic view of another embodiment of the first shaft and the variable force spring of the movable unit;

FIG. 3B is a sectional view of the first rotating shaft of the movable unit shown in FIG. 3A in combination with a variable force spring;

FIG. 3C is a schematic view of the rib of the movable unit shown in FIG. 3A engaging the slide slot of the housing;

FIG. 4 is a schematic diagram of the stroke-spring force relationship of the variable force spring in the embodiment of the pressure regulating device shown in FIGS. 2A-3C;

FIG. 5A is an exploded view of a second embodiment of the pressure regulating device of the present application;

FIG. 5B is a perspective view of a movable unit of the embodiment of the pressure regulating device shown in FIG. 5A;

FIG. 5C is a cross-sectional view of the embodiment of the pressure regulating device shown in FIG. 5A;

fig. 6A is a sectional view of a variable-volume chamber in a contracted state of a third embodiment of the pressure regulating device of the present application;

FIG. 6B is a cross-sectional view of the variable-volume chamber of the third embodiment of the pressure regulating device of the present application in an expanded state;

FIG. 6C is a partial schematic view of a movable unit of a third embodiment of the pressure regulating device of the present application;

fig. 7 is a schematic view showing the relationship of deformation displacement-elastic force of the tension spring of the third embodiment of the pressure adjusting apparatus of the present application shown in fig. 6A;

FIG. 8 is a cross-sectional view of a fourth embodiment of the pressure regulating device of the present application;

FIG. 9A is a schematic view of a variable-volume chamber of a fifth embodiment of the pressure regulating device of the present application in a compressed state;

FIG. 9B is a schematic view of a variable-volume chamber of a fifth embodiment of the pressure regulating device of the present application in an expanded state;

FIG. 9C is a partial schematic view of a movable unit of the pressure regulating device shown in FIG. 9A;

FIG. 10 is a schematic diagram showing the relationship between the approaching displacement and the repelling equivalent elastic force of the two magnets in the embodiment of the pressure regulating device shown in FIG. 9A;

FIG. 11A is a schematic view of a variable-volume chamber of a sixth embodiment of the pressure regulating device of the present application in a compressed state;

FIG. 11B is a schematic view of the second shaft of the pressure regulating device of the present application shown in FIG. 11A in a third sliding slot of the housing;

FIG. 11C is a schematic view of a variable-volume chamber of a sixth embodiment of the pressure regulating device of the present application in an expanded state;

FIG. 11D is a schematic view of the second shaft of the pressure regulating device of the present application shown in FIG. 11C in a third sliding slot of the housing;

FIG. 11E is a schematic view of the constant force spring of the pressure regulating device of the present application shown in FIG. 11A engaged with a second rotatable shaft;

fig. 11F is a perspective view of the movable unit of the pressure adjusting device of the present application shown in fig. 11A;

fig. 11G is a schematic view of a state in which the two constant force springs of the pressure adjusting device of the present application shown in fig. 11A slide in the third groove and the pushing portion of the movable unit, respectively;

fig. 12A-12D are schematic views of four embodiments, respectively, of a pressure regulating device of the present application.

Element number

101: a housing; 1011: a first channel; 20: an external device; 102: a variable-volume chamber; 1031: a movable unit; 1032: a limiting unit; 1033: a rib; 1034: a chute; 1033a: a first rib; 1033b: a second rib; 1034a: a first chute; 1034b: a second chute; 104: a variable force spring; 1041: an outer end portion; 1042: an inner diameter surface; 1035: a first rotating shaft; 1036: a first groove; 134: a second groove; 105: a key structure; 106: a tension spring; 107a: a magnet; 107b: a magnet; 108: a first constant force spring; 109: a second constant force spring; 1091: the inner diameter surface of the second constant force spring; 110: a second rotating shaft; 112: a third groove; 111: a pushing section; 113: a third chute; 1081: the outer end part of the first constant force spring; 1092: the outer end part of the second constant force spring; 114: a first plane; 115: an indicator; 116: a sealing cover; 117: a second channel; 118: a third channel; 119: a fourth channel; 120: a first rotating section; 121: a second rotating part; 122: an input plug; 123: a sealing plug; 124: a groove; 125: a first connection chamber; 126: a second connection chamber; 127: a third rib; 128: a gas valve; 129: a liquid valve; 333: an elastomer.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application shall fall within the scope of the protection of the embodiments in the present application.

The following further describes specific implementations of embodiments of the present application with reference to the drawings of the embodiments of the present application.

Referring to fig. 1 to 12D, in one specific implementation of the present application, there is provided a pressure regulating device including: a variable volume chamber 102 provided with a first passage 1011, the variable volume chamber 102 communicating with the external device 20 through the first passage 1011, the variable volume chamber 102 expanding or contracting according to the magnitude of the cavity pressure; a limiting unit 1032 coupled to the variable volume chamber 102, wherein the limiting unit 1032 moves with the expansion or contraction of the variable volume chamber 102 and simultaneously applies an opposite force to the variable volume chamber 102, so that the chamber pressure of the variable volume chamber 102 and the opposite force of the limiting unit 1032 tend to be balanced, and the external device 20 tends to be in a constant pressure state. The term "coupled" includes both direct and indirect connections.

In one embodiment, the pressure adjustment device further includes an indicator 115 and an index region (not shown), the indicator 115 being configured to indicate a corresponding index in the index region according to the movement of the limiting unit 1032; the restriction unit 1032 may generate opposing forces of at least two force values as the variable-volume chamber 102 expands or contracts, each force value corresponding to a corresponding index in the index region. The index region may include a safety region in which the indicator falls when the reverse force applied to the variable-volume chamber by the restriction unit is within a preset range, and a warning region in which the indicator falls when the reverse force applied to the variable-volume chamber by the restriction unit exceeds the preset range. For example, referring to the placement of the pressure adjustment device in fig. 2G, the index area may be sequentially set with three indication areas, i.e., red, green, and yellow, from bottom to top, where green is the safety area, and red and yellow are the warning areas. If the indicator initially falls in the green indication region, the indicator tends to move downward when the external device is compressed causing the variable-volume chamber to expand, and the restriction unit applies a counter force to the variable-volume chamber to cause the indicator to tend to move upward, at least partially or entirely. When the two are completely counteracted, the indicator stays at the original position; when the trend of the downward movement is greater than that of the upward movement, the indicator member moves downward, and if the indicator member reaches the red area, which represents that the pressure of the variable-volume chamber or the external device has exceeded the safety value, a doctor is required to take a corresponding measure. When the external device or the volume-variable chamber leaks air to cause the volume-variable chamber to shrink, the indicator tends to move upwards, the reverse acting force applied to the volume-variable chamber by the limiting unit tends to decrease, the indicator moves upwards, and if the indicator reaches a yellow area, the pressure of the volume-variable chamber or the external device is reduced, and a doctor needs to take corresponding measures. The limiting unit can generate reverse acting force with at least two force values along with the expansion or contraction of the volume variable chamber, so that the limiting unit can enable the reverse acting force of the limiting unit to be the same as the cavity pressure of the volume variable chamber for the expansion or contraction of the volume variable chamber in different degrees, the cavity pressure fluctuation in the volume variable chamber is small, namely, the volume variable chamber is in a constant pressure state, and further, an external device can be in a constant pressure state.

The restriction unit 1032 may be provided inside (as shown in fig. 12B, 12D) or outside (as shown in fig. 12A, 12C) the variable-volume chamber 102. As shown in fig. 12B and 12D, in an embodiment, the restriction unit 1032 includes an elastic body 333 disposed inside the variable-volume chamber 102, and two ends of the elastic body 333 are respectively connected to the inner wall of the variable-volume chamber 102, so that the elastic body can be elongated or shortened along with the expansion or contraction of the variable-volume chamber 102. The elastic body 333 may be a tension spring, a linear body having elasticity, or other elastic structure. As shown in fig. 12A and 12C, in another embodiment, the limiting unit 1032 is disposed outside the variable volume chamber 102, wherein the limiting unit 1032 may be a variable force spring or other type of spring.

In one embodiment, the restriction unit 1032 is disposed outside the variable volume chamber 102, and the pressure adjusting device includes: a housing 101, a variable volume chamber 102, a movable unit 1031 and a restricting unit 1032, the first passage 1011 passing through the housing 101 to communicate with the external device 20, an index region provided in the housing 101, and an indicator 115 provided in the movable unit 1031; the variable volume chamber 102 is provided with a first channel 1011, and the variable volume chamber 102 expands or contracts according to the magnitude of the chamber pressure; when the pressure of the external device 20 increases or decreases, the variable volume chamber 102 expands or contracts, and the restriction unit 1032 applies a force in opposition to the variable volume chamber 102 via the movable unit 1031, so that the chamber pressure of the variable volume chamber 102 and the force in opposition of the restriction unit 1032 tend to be balanced, and the external device 20 tends to a constant pressure state. The variable volume chamber 102 may be selected from a bladder, a piston, or a combination thereof. The external device 20 may be a balloon, water bladder, or other similar structure.

As shown in fig. 1A, when the external device 20 is filled with gas, the housing 101 is provided with a second passage 117, the second passage 117 is respectively communicated with the variable-volume chamber 102 and external gas, the external gas may be atmospheric gas or a device for storing gas, one end of the second passage 117 communicated with the external gas may be provided with a gas valve 128, gas is injected into the variable-volume chamber 102 through the gas valve 128 to increase the pressure of the variable-volume chamber 102, or gas is extracted from the variable-volume chamber 102 to decrease the pressure of the variable-volume chamber 102, since the external device 20 is communicated with the variable-volume chamber 102, the pressure of the external device 20 is increased or decreased by the increase and decrease of the pressure of the variable-volume chamber 102, and thus the pressure of the external device 20 can be changed. The pressure regulating device of the present application can be used in various scenarios, for example, when the external device 20 is a balloon for medical use, the pressure of the balloon needs to be kept at a constant value F during the operation, and when the pressure of the balloon changes, the pressure regulating device performs adaptive compensation or pressure relief, so that the pressure of the balloon is always kept at the constant value F.

As shown in fig. 1B, when the environment to be measured is liquid, the casing 101 is provided with a third channel 118 and a fourth channel 119, the third channel 118 communicates with the variable-volume chamber 102 and the external liquid, respectively, and the fourth channel 119 communicates with the variable-volume chamber 102 and the atmosphere, respectively. The external liquid may be stored in the container. The end of the third channel 118 communicating with the external liquid may be provided with a liquid valve 129 and the end of the fourth channel 119 communicating with the atmosphere may be provided with a liquid blocking means which is capable of passing the atmosphere but not the liquid, thereby equalizing the gas pressure of the variable-volume chamber 102, while allowing the liquid to be injected into or withdrawn from the variable-volume chamber 102 through the liquid valve 129 to adjust the pressure of the variable-volume chamber 102.

Wherein the movable unit 1031 is connected to the variable volume chamber 102 and is movable in a direction in which the variable volume chamber 102 expands or contracts; a restricting unit 1032 is connected to the movable unit 1031 and the housing 101, respectively, and the restricting unit 1032 applies a reverse force to the movable unit 1031 in accordance with the movement of the movable unit 1031.

As shown in fig. 2B-2F, in one embodiment, the movable unit 1031 has a rib 1033, the housing 101 has a slide groove 1034 engaged with the rib 1033, the rib 1033 can move along the slide groove 1034 as the volume-variable chamber 102 expands or contracts, and the slide groove 1034 restricts the movable unit 1031 so that the movable unit 1031 moves along the axial direction of the pressure adjustment device. Optionally, the ribs 1033 include a first rib 1033a and a second rib 1033b, and the runner 1034 includes a first runner 1034a coupled to the first rib 1033a and a second runner 1034b coupled to the second rib 1033 b. When the housing 101 is cylindrical, the connecting lines of the first and

second ribs

1033a and 1033b may be on the same plane, so that the first and

second ribs

1033a and 1033b are more stably positioned in the first and

second chutes

1034a and 1034b and slide up and down in the first and

second chutes

1034a and 1034b in a direction parallel to the central axis of the pressure adjustment device (with reference to the paper). The number of the second sliding grooves 1034b may be one or two, as shown in fig. 2F, the number of the second sliding grooves 1034b is one, and it may be formed by recessing the inner surface of the housing 101, and the second protruding ribs 1033b are respectively positioned at both sides of the second sliding grooves 1034b.

In one embodiment, the restriction unit 1032 includes a variable force spring 104, and the variable force spring 104 can be stretched as the variable volume chamber 102 expands or contracts to generate at least two constant force values of opposing forces and at least two non-constant force values of opposing forces applied to the variable volume chamber 102, and each constant force value of opposing forces corresponds to a stroke greater than 0. As shown in FIG. 4, F1, F2, etc. are constant force values, and the force values between 0-F1, F1-F2, etc. are non-constant force values.

In one embodiment, the movable unit 1031 is provided with an indicator 115, the housing 101 is provided with an indicating area, each index in the indicating area is responsive to the moving distance (stroke) of the variable-force spring 104, and is also responsive to the reverse acting force generated by the variable-force spring 104, and is also responsive to the chamber pressure level of the variable-volume chamber 102, and the movable unit 1031 can drive the indicator 115 to indicate the corresponding pressure index as the variable-volume chamber 102 expands or contracts. Because the elastic force (i.e., the reverse acting force) generated by the variable force spring 104 is not changed when the moving distance of the variable force spring 104 is between X1 and X2, the indication area can be provided with indication marks with larger areas, such as color blocks, so that the color blocks can be more striking, and the user can more clearly know the pressure condition of the external device.

In an embodiment, three main color blocks of red, green and yellow may be sequentially arranged in the indication area from bottom to top (with the placement of the pressure adjustment device in fig. 2G as a reference), while a gradient area is arranged between the red area and the green area, and another gradient area is arranged between the green area and the yellow area. The yellow, green and red regions may correspond to F1, F2, F3 in fig. 4, respectively, the gradation region between the green and yellow regions corresponds to the force value between F1 and F2, and the gradation region between the red and green regions corresponds to the force value between F2 and F3. In one scenario, the indicator is initially in a green region, when the external device is compressed to cause the volume-variable chamber to expand, the indicator moves downwards along with the movable unit, when the travel of the variable-force spring is between X3-X4, the indicator is always in the green region, and the counter-acting force F2 applied to the volume-variable chamber by the limiting unit is a constant value; when the indicator reaches the gradual change region between the green and red regions, the opposing force of the restriction unit increases until the chamber pressure within the variable-volume chamber reaches an equilibrium point with the opposing force of the restriction unit. The balance point may be in a gradation region between green and red regions, or in a red region, depending on the degree to which the external device is compressed. When the red area is reached, the doctor can immediately take corresponding countermeasures. When the volume variable chamber contracts due to air leakage of an external device or the volume variable chamber, the indicator moves upwards along with the movable unit, when the moving stroke of the variable force spring is between X2 and X3, the indicator is in a gradual change area between a green area and a yellow area, and the counter acting force of the limiting unit is reduced until the chamber pressure in the volume variable chamber and the counter acting force of the limiting unit reach an equilibrium point. The balance point may be in a gradual region between the green and yellow regions, or in the yellow region, depending on the degree of air leakage. When the yellow area is reached, the doctor can immediately take corresponding countermeasures.

In one embodiment, the variable force spring 104 comprises an elastic rolling piece, the rolling piece is provided with an outer end 1041 and an inner diameter surface 1042, the movable unit 1031 is provided with a first rotating shaft 1035 and a first recess 1036, the first rotating shaft 1035 can rotate in the first recess 1036, the outer end 1041 of the variable force spring 104 is connected with the housing 101, and the inner diameter surface 1042 of the variable force spring 104 is coupled with the first rotating shaft 1035. The first shaft 1035 may be a drum shaft or other type of shaft, and the first recess 1036 may be one, two, or more. As shown in fig. 2E, the first rotation shaft 1035 may be a solid or hollow rotation shaft, the first rotation shaft 1035 may include a first rotation portion 120 and two second rotation portions 121, the two second rotation portions 121 respectively extend from two sides of the first rotation portion 120 to a direction away from the first rotation portion 120, the diameter of the two second rotation portions 121 may be smaller than that of the first rotation portion 120, the two second rotation portions 121 may be disposed in two first grooves 1036, a groove 124 may be formed between the two second ribs 1033b, and the first rotation portion 120 is sandwiched between the two first grooves 1036.

There are various ways to connect the variable force spring 104 and the first rotating shaft 1035, and in one embodiment, as shown in fig. 2B-2E, an inner diameter surface 1042 of the variable force spring 104 is sleeved on an outer surface of the first rotating shaft 1035 (or the first rotating portion 120).

Since the inner diameter surface 1042 of the spring may have a clearance fit, transition fit, or interference fit with the outer surface of the first shaft 1035 during the manufacturing process of the variable force spring 104, when the inner diameter surface 1042 of the spring is in a clearance fit (loose fit) with the outer surface of the first shaft 1035, the first shaft 1035 does not rotate, and the inner diameter surface 1042 of the variable force spring 104 rotates relative to the outer surface of the first shaft 1035 during elongation and contraction.

When the inner diameter surface 1042 of the spring is in transition fit with the outer surface of the first shaft 1035 (not loose fit), if the friction force of the inner diameter surface 1042 of the spring on the outer surface of the first shaft 1035 is larger than the friction force of the first shaft 1035 and the first groove 1036, the inner diameter surface 1042 of the spring drives the first shaft 1035 to rotate when the inner diameter surface is lengthened or shortened. If the friction force of the inner diameter surface 1042 of the spring engaging the outer surface of the first shaft 1035 is less than the friction force of the first shaft 1035 and the first recess 1036, the inner diameter surface 1042 of the variable force spring 104 rotates relative to the outer surface of the first shaft 1035 as it elongates and contracts.

When the inner diameter surface 1042 of the spring is in interference fit (tight fit) with the outer surface of the first shaft 1035, the friction force of the inner diameter surface 1042 of the spring with the outer surface of the first shaft 1035 is greater than the friction force of the first shaft 1035 with the first recess 1036, and the inner diameter surface 1042 of the spring drives the first shaft 1035 to rotate when it is elongated or shortened.

Fig. 3A-3C illustrate another connection of the variable force spring 104 to the first pivot shaft 1035. In this embodiment, the inner diameter surface 1042 of the variable force spring 104 is provided with a second recess 134, and the outer surface of the first shaft 1035 is provided with a key structure 105, and the key structure 105 is engaged with the second recess 134 to rotate the first shaft 1035 when the variable force spring 104 is elongated or shortened.

When the volume of the variable-volume chamber 102 becomes larger or smaller, the variable-force spring 104 may apply a reaction force to the movable element 1031 relative to the deformation force of the variable-volume chamber 102 until the deformation force and the reaction force reach an equilibrium, providing a cushioning and compensating force to the variable-volume chamber 102. If the pressure in the external device 20 continues to increase, the variable volume chamber 102 is expanded to relieve the pressure in the external device 20, and if the pressure value of the external device 20 is greater than the first force value of the variable force spring 104, the extended stroke of the variable force spring 104 is switched to the second force value, so that the second force value is greater than the first force value, thereby providing a better buffer effect to the variable volume chamber 102. If the pressure value in the external device 20 is continuously greater than the second force value of the variable force spring 104, when the movable unit 1031 slides to the maximum stroke relative to the housing 101, the indicator 115 of the movable unit 1031 indicates the maximum range, and at this time, the pre-warning effect is displayed.

As shown in fig. 4, the spring force of the variable force spring 104 and the elongated stroke form the following relationship: when the variable force spring 104 is elongated from the initial length to reach the constant force F1 due to the deformation of the variable volume chamber 102, the stroke range of the holding force F1 is X1-X2 (wherein 0-X1 is temporarily due to the characteristics of the variable force spring 104 and is substantially ignored), when the variable force spring 104 is elongated from the initial length to reach the constant force F2 due to the deformation of the variable volume chamber 102, the stroke range of the holding force F2 is X2-X4, and so on, the variable force spring 104 can determine the gears representing a plurality of force values. The pressure regulating device of the present application can be set to a plurality of different reaction forces as the stroke of the variable force spring 104 increases according to the user's needs.

As shown in fig. 2G-2H, when the pressure of the external device 20 is reduced, the variable volume chamber 102 may be contracted and deformed by the pressure of the external device 20, and a deformation force is applied to the movable unit 1031 to move the movable unit 1031 in a direction approaching the variable volume chamber 102, and the variable force spring 104 applies a reverse force to the deformation force to the movable unit 1031 to move the movable unit 1031 in a direction away from the variable volume chamber 102 until the deformation force and the reverse force are balanced, the reverse force also being changed into a plurality of forces in stages with the change of the stroke section. Therefore, the pressure adjustment device of the present application converts the force value (= pressure × cross-sectional area of the variable volume chamber 102) of the variable force spring 104 into the internal pressure of the variable volume chamber 102 through the preset force value of the variable force spring 104, so as to provide more accurate pressure range indication for the device, and the movable unit 1031 represents different pressures by moving different stroke ranges, so that the indicator 115 can accurately indicate the pressures. The indicator 115 may be a pointer or other device having an indicating function.

When the user needs to adjust the regulated reference value (even if the external device 20 is stabilized at a designated pressure value or pressure range), and the pressure of the external device 20 needs to be changed, the force-changing spring 104 can be switched to a corresponding shift position by pumping or injecting the same substance as the substance filled in the external device 20 into the variable-volume chamber 102, moving the indicator 115 to a target value or value range through the movable unit 1031.

In fig. 2A-3C, variable volume chamber 102 is a balloon and in fig. 5A-5C, variable volume chamber 102 is a piston.

In an embodiment, the top of the movable unit 1031 is provided with an indicator 115 extending along the first plane 114, and the housing 101 is provided with a pressure index indicating zone, wherein the indicator 115 can indicate a corresponding pressure index as the rib of the movable unit 1031 slides in the slide groove of the housing 101. Since the top of the limiting groove of the pressure index indicating region of the housing 101 is also flat, no indicator 115 is easily damaged by excessive pressure.

In one embodiment, the housing 101 includes a cylindrical housing and a sealing cover 116, the housing and the sealing cover 116 are sealably connected, and the variable-volume chamber 102 is connected to the sealing cover 116 and a top portion of the movable unit 1031, respectively. In one embodiment, the bottom of the sealing cover 116 and the top of the movable unit 1031 are respectively provided with a first connection chamber 125 and a second connection chamber 126, the first connection chamber 125 and the second connection chamber 126 are respectively provided with an input plug 122 and a sealing plug 123, the first passage 1011 passes through the input plug 122 to communicate with the variable volume chamber 102, the input plug 122 is connected with the variable volume chamber 102 in a sealing manner, the input plug 122 is provided with a through hole therein for passing through the first passage 1011, the second passage 117 and the third passage 118 to communicate with the variable volume chamber 102, and the sealing plug 123 is connected with the variable volume chamber 102 and the top of the movable unit 1031 in a sealing manner. The outer end 1041 of the variable force spring 104 may be fixedly attached to the seal gland 116 and the input plug 122 may be fixed to the bottom of the seal gland 116.

In another embodiment, as shown in fig. 6A-7, the restriction unit 1032 comprises a tension spring 106, the tension spring 106 comprising a helical elastic coil, both ends of the coil being connected to the housing 101 and the variable-volume chamber 102, respectively. As shown in fig. 8, the spring force-deflection displacement curve of the tension spring 106 is a proportional function, and the slope is the spring constant. Since the larger the displacement of the tension spring 106 is, the larger the elastic force is, so that the same displacement is obtained, the amount of change in the elastic force of the tension spring 106 is reduced, and the scales of the pressure index indication area can be denser.

In yet another embodiment, as shown in fig. 9A-9C, the restriction unit 1032 comprises two magnets (107 a, 107 b), and the two magnets (107 a, 107 b) are disposed opposite to each other in the same polarity and fixed to the bottom of the housing 101 and the bottom of the variable-volume chamber 102, respectively. The magnets (107 a, 107 b) may be replaced by magnets or other magnetic means. The indicator 115 is not pressed against the housing 101 due to the two magnets (107 a, 107 b) repelling each other in the same order, and thus is not damaged. Please refer to fig. 10 in combination with the above description,

when the magnet 107a at one end of the movable unit 1031 is displaced by X1 from the initial position due to the deformation of the volume variable chamber 102, the repulsion equivalent elastic force generated by the two magnets (107 a, 107 b) is F1; when the magnet 107a at one end of the movable element 1031 is displaced by X2 due to the deformation of the volume variable chamber 102, the two magnets (107 a, 107 b) generate a repulsive equivalent elastic force F2. It is obvious that the repulsive equivalent spring force and the displacement amount of the two magnets (107 a, 107 b) approaching each other at this time are in a relationship of gradually increasing curvature. Since the magnetic field lines are more concentrated as the distance of displacement of the two magnets (107 a, 107 b) from each other increases, the amount of change in the repulsive equivalent spring force decreases for the same displacement.

As shown in fig. 11A-11G, in another embodiment, the limiting unit 1032 comprises a first constant force spring 108 and a second constant force spring 109, an inner diameter surface 1091 of the second constant force spring 109 is coupled to the second rotating shaft 110, the movable unit 1031 is provided with a third recess 112 and a pushing part 111, the housing 101 is provided with a third sliding groove 113; the first constant force spring 108 is engaged with the third groove 112, and an outer end 1081 of the first constant force spring 108 is connected to the housing 101; the second constant force spring 109 is engaged with the pushing portion 111, an outer end 1092 of the second constant force spring 109 is connected to the housing 101, the second rotating shaft 110 can slide in the third sliding slot 113, and the third sliding slot 113 is disposed below the pushing portion 111. In one embodiment, at least a portion of the outer circumference of the first constant force spring 108 is rotatably confined in the third groove 112, and the inner diameter surface 1091 of the second constant force spring 109 is fixedly connected to the second shaft 110. The constant force spring generates a constant elastic force when receiving a tensile force. The third groove 112 and the pushing part 111 may be a card slot. In this embodiment, the movable unit 1031 may be provided with at least two third ribs 127, and a corresponding number of slide grooves may be provided on the inner side of the housing 101 to cooperate with the third ribs 127 for the movable unit 1031 to move up and down along the slide grooves. Constant force springs produce a constant force when under tension. This embodiment differs from the variable force spring 104 in that the constant force spring in this embodiment can be stretched as the variable volume chamber 102 expands or contracts to generate opposing forces of at least two constant force values applied to the variable volume chamber 102. When the movable unit 1031 drives the first constant force spring 108 to move downwards and does not contact the second constant force spring 109, the variable volume chamber 102 is subjected to the reaction force of the first constant force spring 108, and when the movable unit 1031 moves downwards until the pushing part 111 abuts against the second constant force spring 109, the second constant force spring 109 starts to be pushed to move downwards, and at this time, the variable volume chamber 102 is subjected to the common reaction force of the first constant force spring 108 and the second constant force spring 109. The indicator region may be provided with a color patch of one color for the stroke of the first constant force spring 108 and another color patch for the stroke of the first constant force spring 108+ the second constant force spring 109.

When the first constant force spring 108 is unstretched, the outer end portion is fixed to the inner wall of the housing 101, and the first constant force spring 108 is engaged with the third recess 112 of the movable unit 1031 to enable the first constant force spring 108 to elongate or contract. The winding sheet of the first constant force spring 108 can be clamped at two ends of the clamping groove and can freely slide. When the second constant force spring 109 is not stretched, the outer end 1092 thereof is also fixed to the inner wall of the housing 101, and the second constant force spring 109 is engaged with the pushing portion 111 of the movable unit 1031. The second rotating shaft 110 may be a drum shaft, the inner diameter surface 1091 of the second constant force spring 109 is fixedly connected to the second rotating shaft 110 and then slides in the pushing portion 111, and the pushing portion 111 may be a U-shaped groove or a groove with other shapes. When the volume of the variable volume chamber 102 increases, the first constant force spring 108 is pushed by the movable unit 1031 to move downward, and the movable unit 1031 is subjected to the reaction force of the first constant force spring 108; when the first constant force spring 108 moves downward to the movable unit 1031 to push the second constant force spring 109, the second constant force spring 109 also moves downward, and the movable unit 1031 receives the reaction force of the first constant force spring 108 and the second constant force spring 109.

This embodiment is through predetermineeing behind the constant force spring power value, parallelly connected a plurality of constant force springs to the power value that can the superimposed spring, and then can set up a plurality of pressure values, this embodiment can have the stack of a plurality of different reaction forces along with the increase of stroke according to the user's demand. The movable unit 1031 represents different pressures by moving different stroke ranges, thereby enabling the indicator 115 to accurately indicate the pressure.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the embodiments of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims

1. A pressure regulating device, characterized by comprising:

a variable-volume chamber provided with a first passage through which the variable-volume chamber communicates with an external device, the variable-volume chamber expanding or contracting in accordance with the magnitude of the chamber pressure;

and the limiting unit is coupled with the variable volume chamber, moves along with the expansion or contraction of the variable volume chamber and applies reverse acting force to the variable volume chamber at the same time, so that the cavity pressure of the variable volume chamber and the reverse acting force of the limiting unit tend to be balanced, and the external device tends to be in a constant pressure state.

2. The pressure regulating device according to claim 1, wherein the restriction unit comprises an elastic body disposed inside the variable-volume chamber, and both ends of the elastic body are respectively connected to the inner wall of the variable-volume chamber so as to be elongated or shortened in response to expansion or contraction of the variable-volume chamber.

3. The pressure regulating device according to claim 2, wherein the restriction unit is provided outside the variable-volume chamber, the pressure regulating device further comprising:

a housing through which the first passage communicates with an external device;

a movable unit connected to the variable-volume chamber and movable in a direction in which the variable-volume chamber expands or contracts;

the limiting unit is respectively connected with the movable unit and the shell;

when the pressure of the external device is increased or decreased, the volume-variable chamber expands or contracts, the limiting unit applies a reverse acting force to the volume-variable chamber through the movable unit, so that the chamber pressure of the volume-variable chamber and the reverse acting force of the limiting unit tend to be balanced, and the external device tends to be in a constant pressure state.

4. The pressure regulating device according to claim 3, further comprising an indicator configured to indicate a corresponding index in the index region according to the movement of the limiting unit; the restriction unit may generate opposing forces of at least two force values as the variable-volume chamber expands or contracts, each force value corresponding to a corresponding index in the index zone.

5. The pressure regulating device of claim 4, wherein the index zone is disposed in the housing and includes a safety zone and a warning zone, the indicator being disposed on the movable unit;

when the counter acting force applied to the volume variable chamber by the limiting unit is within a preset range, the indicator falls in the safety area, and when the counter acting force applied to the volume variable chamber by the limiting unit exceeds the preset range, the indicator falls in the warning area.

6. A pressure regulating device according to claim 3, wherein the movable unit is provided with a rib, the housing is provided with a slide groove engaged with the rib, the rib is movable along the slide groove as the variable-volume chamber expands or contracts, and the slide groove restricts the movable unit to move the movable unit in the axial direction of the pressure regulating device.

7. The pressure regulating device of claim 6, wherein the rib includes a first rib and a second rib, and the runner includes a first runner that cooperates with the first rib and a second runner that cooperates with the second rib.

8. The pressure regulating device according to claim 3, wherein the restriction unit comprises a variable force spring which is stretchable as the variable volume chamber expands or contracts to generate at least two constant force values of opposing forces and at least two non-constant force values of opposing forces applied to the variable volume chamber, each constant force value of opposing forces corresponding to a stroke greater than 0.

9. A pressure regulating device according to claim 8, characterized in that the force varying spring comprises an elastic winding sheet provided with an outer end portion and an inner diameter surface, the movable unit is provided with a first rotation shaft and a first recess, the first rotation shaft is rotatable in the first recess, the outer end portion of the force varying spring is connected to the housing, and the inner diameter surface of the force varying spring is coupled to the first rotation shaft.

10. The pressure regulating device of claim 9, wherein the inner diameter surface of the variable force spring is in a clearance fit, transition fit or interference fit with the outer surface of the first rotating shaft.

11. A pressure regulating device according to claim 9, wherein the inner diameter surface of the variable force spring is provided with a second groove, and the outer surface of the first rotary shaft is provided with a key structure which is fitted with the second groove.

12. A pressure regulating device according to claim 3, characterized in that the restriction unit comprises a tension spring comprising a helical elastic coil, both ends of which are connected to the housing and the variable-volume chamber, respectively.

13. A pressure regulating device according to claim 3, wherein the restricting unit comprises two magnets having opposite poles and fixed to the bottom of the casing and the bottom of the variable-volume chamber, respectively.

14. A pressure regulating device according to claim 3, wherein the restricting unit comprises a first constant force spring and a second constant force spring, an inner diameter surface of the second constant force spring is coupled with the second rotary shaft, the movable unit is provided with a third groove and a pushing portion, the housing is provided with a third sliding groove; the first constant force spring is matched with the third groove, and the outer end part of the first constant force spring is connected with the shell; the second constant force spring is matched with the pushing part, the outer end part of the second constant force spring is connected with the shell, the second rotating shaft can slide in the third sliding groove, and the third sliding groove is arranged below the pushing part.

15. A pressure regulating device according to claim 14, wherein at least a portion of the outer periphery of the first constant force spring is rotatably confined in the third recess, and the inner diameter surface of the second constant force spring is fixedly connected to the second rotary shaft.

16. A pressure regulating device as claimed in claim 4, characterized in that the indicator member is provided at the top of the movable unit and extends along a first plane.

17. A pressure regulating device according to claim 3, wherein the casing comprises a cylindrical housing and a sealing cover sealably connected to the housing, the variable-volume chamber being connected to the sealing cover and a top of the movable unit, respectively.

18. A pressure regulating device according to claim 3, characterized in that the variable volume chamber is selected from a bladder, a piston or a combination thereof.

19. A pressure regulating device according to claim 3, characterized in that the housing is provided with a second passage for communication with the variable-volume chamber and with the external gas, respectively, when the external device is filled with gas.

20. A pressure regulating device according to claim 3, characterized in that the housing is provided with a third passage and a fourth passage when the external device is filled with liquid, the third passage communicating with the variable-volume chamber and the external liquid, respectively, and the fourth passage communicating with the variable-volume chamber and the atmosphere, respectively.