CN219721612U

CN219721612U - Pressure regulating valve for anesthesia machine

Info

Publication number: CN219721612U
Application number: CN202223514008.9U
Authority: CN
Inventors: 李�杰; 张凯
Original assignee: Aeonmed Healthcare Technology Co ltd
Current assignee: Aeonmed Healthcare Technology Co ltd
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2023-09-22
Anticipated expiration: 2032-12-28

Abstract

The utility model relates to a pressure regulating valve for an anesthesia machine, comprising: valve seat, case, valve body. The valve is characterized in that the valve body comprises an outer shell, an inner shell and a lifting spring, a central shaft is arranged in the outer shell, a valve core is arranged at the tail end of the central shaft, and when the outer shell is lifted upwards, the central shaft drives the valve core to move upwards together, so that the valve core is separated from an air outlet of a valve seat; the top of the inner shell is provided with an opening for the central shaft to pass through, and the bottom of the inner shell is fixedly connected with the valve seat; the lifting spring is penetratingly arranged on the central shaft of the outer shell, one end of the lifting spring is propped against the inner surface of the top of the inner shell, a retainer ring fixed on the central shaft is arranged at a position which is a certain distance away from the end, and the upper surface of the retainer ring is propped against the compression spring, so that the lifting spring is compressed to a certain extent. The utility model changes the structure of the existing pressure regulating valve, so that the lifting spring can be installed from the bottom of the pressure regulating valve, thereby simplifying the structure of the existing pressure regulating valve and reducing the volume of the pressure regulating valve.

Description

Pressure regulating valve for anesthesia machine

Technical Field

The utility model relates to the field of manual ventilation devices of anesthesia machines, in particular to a pressure regulating valve for an anesthesia machine.

Background

A pressure regulating valve (adjustable pressure limiting valve), also known as an APL valve, is a component of the breathing circuit portion of the anesthesia machine that limits the upper limit of airway pressure during manual ventilation to protect the patient from barometric pressure.

As shown in fig. 1 (for distinguishing the reference numerals of the present utility model, the reference numerals of the prior art use circled numbers), the existing pressure regulating valve mainly includes a valve core gasket (1), a valve core (2), a positioning pin (3), a valve seat (4), a nut (5), a scale block (6), an inner case (7), a damping gasket (8), an outer case (9), a large gasket and a lifting springTop column spring->Top pin->Dividing disc->Upper cover->Stroke guide bar->Pressure plate->Screw guide->Small washer->Locking sleeve->Guide pin->Pressure springValve core lock nut>

The lifting spring in the prior art is installed from the top of the pressure regulating valve, and cannot be installed correctly without separating the outer shell from the inner shell respectively. Therefore, the shell assembly of the existing pressure regulating valve is divided into a pressure regulating shell (9) and a pressure regulating valve dividing discPressure regulating valve upper cover->Stroke guide bar->Pressure regulating valve plate->The 5 parts are divided into a pressure regulating valve inner shell (7), a pressure regulating valve positioning pin (3) and a pressure regulating valve locking sleeve +.>Pressure regulating valve guide pin->These 4 parts (for example, the installation process of the inner shell: before the inner shell (7) is installed, the guide pin is added->The interference is pressed into the inner shell (7), and the locating pin (3) is screwed into the threaded hole of the inner shell (7)And sleeving the nut (5) on the inner shell (7), sleeving the scale block (6) on the inner shell (7), and then tightly propping the nut and the inner shell (7) by using a flat-end fastening screw, wherein the outer side of the scale block (6) is provided with a threaded hole, the screw is screwed into the threaded hole to enter a groove outside the inner shell (7), and the scale block (6) and the inner shell (7) are fixed together after tightly propping.

For this reason, the existing pressure regulating valve has a very complex overall structure, and many parts are used for each assembly, so that the pressure regulating valve has the disadvantages of high production cost, complex installation and difficult debugging.

Disclosure of Invention

In view of the above-described drawbacks of the existing pressure regulating valve, the present utility model changes the structure of the existing pressure regulating valve so that the lift spring can be installed from the bottom of the pressure regulating valve, thereby simplifying 5 components of the existing pressure regulating valve outer shell assembly into 1 component, and simplifying 4 components of the existing pressure regulating valve inner shell assembly into 1 component.

Specifically, the present utility model provides a pressure regulating valve for an anesthesia machine, comprising: the valve seat is provided with an air inlet and an air outlet, wherein the air inlet is connected with a manual ventilation part of the anesthesia machine, and the air outlet is connected with an exhaust gas discharge port of the anesthesia machine; the valve core is used for sealing an air inlet of the valve seat; the valve body is used for controlling the connection relation between the valve core and the valve seat air inlet; the valve body comprises an outer shell, an inner shell and a lifting spring, wherein a central shaft is arranged in the outer shell, a valve core is arranged at the tail end of the central shaft, and when the outer shell is lifted upwards, the central shaft drives the valve core to move upwards together, so that the valve core is separated from an air outlet of the valve seat; the top of the inner shell is provided with an opening for the central shaft to pass through, and the bottom of the inner shell is fixedly connected with the valve seat; the lifting spring is penetratingly arranged on the central shaft of the outer shell, one end of the lifting spring is propped against the inner surface of the top of the inner shell, a retainer ring fixed on the central shaft is arranged at a position which is a certain distance away from the end, and the upper surface of the retainer ring is propped against the compression spring, so that the lifting spring is compressed to a certain extent.

The retainer ring may be secured to the central shaft in this manner: the central shaft is provided with a mounting groove along the circumferential direction at the coupling position of the central shaft and the check ring, the check ring can elastically deform in the radial direction, and the check ring is embedded into the mounting groove after being expanded in the radial direction to realize fixation.

More preferably, a cavity is arranged in the central shaft, the valve core is movably arranged at the tail end of the central shaft through the cavity and can slide up and down in a certain travel range along the axis of the cavity, and the top end of the valve core and the tail end of the central shaft are mutually clamped to form a limiting part, so that the valve core cannot be separated from the cavity.

More preferably, the valve body further comprises a spiral guide piece and a pressure spring, wherein a central hole corresponding to the central shaft is arranged in the spiral guide piece, the cross sections of the central shaft and the central hole are of non-circular design, and the central shaft and the central hole are matched with each other, so that the shell and the spiral guide piece are relatively fixed in the rotating direction, but can relatively move up and down; the inner surface of the inner shell is provided with a connecting component (pin connection or threaded connection) which is matched with the external threads of the spiral guide piece, so that the spiral guide piece moves up and down in the axial direction of the inner shell while rotating; one end of the pressure spring is propped against the lower surface of the spiral guide piece, and the other end of the pressure spring is propped against the upper surface of the valve core; when the outer shell is rotated, the outer shell drives the spiral guide piece to rotate, so that the spiral guide piece moves up and down in the axial direction of the inner shell while rotating, the change of the distance between the spiral guide piece and the valve core is realized, the compression degree of the pressure spring is controlled, and the opening pressure is adjusted.

Preferably, the surface of the housing is provided with a scale characterizing the opening pressure, wherein the scale is arranged such that the actual opening pressure, the compression of the pressure spring, corresponds to the indication of the scale.

The pressure regulating valve that this patent mentioned has simplified the structure of current pressure regulating valve, has reduced the part quantity that uses, has improved installation accuracy, has reduced manufacturing cost, has also reduced the volume of pressure regulating valve simultaneously, makes the size of pressure regulating valve more accord with ergonomic's design, and the operation is more handy.

Drawings

FIG. 1 is a diagram of a conventional pressure regulating valve;

FIG. 2 is a block diagram of a pressure regulating valve according to the present utility model;

FIG. 3 is an exploded view of the pressure regulating valve of the present utility model;

FIG. 4 is a schematic illustration of the connection of the lift spring to the inner and outer shells of the present utility model;

FIG. 5 is a schematic view of a retainer ring fixedly mounted on a central shaft according to the present utility model;

fig. 6 is a cross-sectional view of the pressure regulating valve of the present utility model for showing the positional relationship among the outer case, the center shaft, and the inner case.

Reference numerals:

1. outer shell 2, inner shell 3, lifting spring

4. Screw guide 5, pressure spring 6, valve core

7. Valve seat 8, air inlet 9 and air outlet

10. Center shaft 11, retainer ring

Detailed Description

The technical scheme provided by the utility model is further described below by combining with the embodiment.

1. General working principle of pressure regulating valve

The pressure regulating valve comprises three modules, namely a valve seat, a valve core and a valve body, and the general working principle is as follows:

the valve seat is provided with a valve port (comprising an air inlet and an air outlet), wherein the air inlet is connected with a manual ventilation part of the anesthesia machine, and the air outlet is connected with an exhaust gas discharge port of the anesthesia machine. Specifically, the valve seat may be integrally formed with the manual ventilation portion of the anesthesia machine, or may be separately formed as a part to be connected to the manual ventilation portion of the anesthesia machine, and in the case of separately forming the part, it is necessary to seal the connection portion to prevent gas of the manual ventilation portion from leaking there.

The valve core seals the air inlet of the valve seat with a certain pressure (hereafter referred to as opening pressure), on one hand, when the input air pressure of the air inlet exceeds the opening pressure, the valve core is pushed open by the input air pressure, so that the air is discharged through the air outlet; on the other hand, the valve element can be lifted off the air inlet manually, so that the air is discharged quickly.

The valve body controls the connection relation between the valve core and the valve port (air inlet) through the arrangement of the corresponding structure, so that on one hand, the opening pressure can be adjusted, and on the other hand, the valve core can be manually lifted away from the air inlet.

2. Valve body structure and working principle

The valve body of the embodiment comprises an outer shell 1, an inner shell 2, a lifting spring 3, a spiral guide piece 4 and a pressure spring 5, wherein the outer shell 1 is used as an operation part, on one hand, the compression degree of the pressure spring 5 is adjusted by rotating the outer shell 1, and further the opening pressure is adjustable; on the other hand, the quick exhaust function is achieved by manually lifting the valve spool 6 off the intake port 8 by pulling up the housing 1.

The casing 1 is provided with a central shaft 10, the spiral guide 4 is provided with a corresponding central hole, the cross sections of the central shaft and the central hole are in non-circular design (in the embodiment, the central shaft is shaped as two opposite planes milled on the outer surface of a cylinder), and the central shaft and the central hole are matched with each other, so that the casing 1 and the spiral guide 4 are relatively fixed in the rotation direction, but can relatively move up and down. A cavity is arranged in the central shaft 10, the valve core 6 is arranged at the tail end of the central shaft 10 through the cavity, and can move up and down in a certain travel range along the axis of the cavity, and the top end of the valve core 6 is matched with the tail end of the central shaft 10 to form a limiting part to limit the travel range of the valve core 6 in the up-and-down movement.

The top of the inner shell 2 is provided with an opening for the central shaft 10 to pass through, and the inner shell 2 and the outer shell 1 can move up and down and rotate freely (of course, after the lifting spring 3 and the pressure spring 5 which are described below are installed, the relative movement of the outer shell 1 and the inner shell 2 is limited by the spring); the bottom of the inner shell 2 is relatively fixedly connected with the valve seat 7; the inner shell 2 is hollow, so that the lifting spring 3, the spiral guide 4 and the pressure spring 5 are installed in the valve body from the lower part of the valve body; the inner housing 2 is provided with an internal thread, which cooperates with an external thread of the screw guide 4, so that the screw guide 4 moves up and down in the axial direction of the inner housing 2 while rotating.

1. Pressure spring and opening pressure adjustment

One end of the pressure spring 5 abuts against the lower surface of the spiral guide 4, and the other end abuts against the upper surface of the valve element 6. When the user rotates the outer shell 1, the outer shell 1 drives the spiral guide piece 4 to rotate, so that the spiral guide piece 4 moves up and down in the axial direction of the inner shell 2 while rotating, the change of the distance between the spiral guide piece 4 and the valve core 6 is realized, the compression degree of the pressure spring 5 is controlled, and the opening pressure is adjusted.

The surface of the housing 1 is provided with a scale characterizing the opening pressure, wherein the scale is arranged such that the actual opening pressure, the compression of the pressure spring 5, corresponds to the indication of the scale.

2. Lifting spring and manual exhausting function

As shown in fig. 4, the lifting spring 3 is penetratingly disposed on the central shaft 10 of the outer shell, one end of the lifting spring abuts against the inner side of the top of the inner shell 2, and a retainer ring 11 is disposed on the central shaft 10, so that the lifting spring 3 generates a certain compression, and then the lifting spring 3 abuts against one end of the inner shell 2 to generate an upward force on the inner shell 2, and meanwhile, the lifting spring 3 abuts against one end of the retainer ring 11 to generate a downward force on the central shaft 10 (the outer shell 1) so that the outer shell 1 abuts against the inner shell 2. When the user lifts the housing 1 (central shaft 10) upward and exceeds the maximum stroke of the valve core 6 relative to the central shaft 10, the valve core 6 is carried by the central shaft 10 to move upward together, so that the air outlets of the valve core 6 and the valve seat 7 are separated, and the quick discharging function is realized.

When the pressure regulating valve in this embodiment is used, an operator firstly sets the opening pressure by rotating the housing 1, when the air pressure of the manual branch of the breathing system of the anesthesia machine is greater than the set opening pressure, the valve core 6 is pushed open to discharge air from the air outlet 9 of the valve seat until the air pressure of the manual branch of the breathing system of the anesthesia machine is recovered to be less than the set opening pressure, and then the valve core will seal the air inlet 8 again. If the air pressure of the manual branch of the anesthesia machine breathing system needs to be quickly reduced, an operator can lift the shell 1 upwards, so that the valve core 6 is separated from the air inlet 8 of the valve seat, and a quick discharging function is realized.

Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present utility model and are not limiting. Although the present utility model has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present utility model, which is intended to be covered by the appended claims.

Claims

1. A pressure regulating valve for an anesthesia machine, comprising:

the valve seat is provided with an air inlet and an air outlet, wherein the air inlet is connected with a manual ventilation part of the anesthesia machine, and the air outlet is connected with an exhaust gas discharge port of the anesthesia machine;

the valve core is used for sealing an air inlet of the valve seat;

the valve body is used for controlling the connection relation between the valve core and the valve seat air inlet;

it is characterized in that the valve body comprises an outer shell, an inner shell and a lifting spring, wherein,

the shell is internally provided with a central shaft, the tail end of the central shaft is provided with a valve core, and when the shell is lifted upwards, the central shaft drives the valve core to move upwards together, so that the valve core is separated from an air outlet of the valve seat;

the top of the inner shell is provided with an opening for the central shaft to pass through, and the bottom of the inner shell is fixedly connected with the valve seat;

the lifting spring is penetratingly arranged on the central shaft of the outer shell, one end of the lifting spring is propped against the inner surface of the top of the inner shell, a retainer ring fixed on the central shaft is arranged at a position which is a certain distance away from the end, and the upper surface of the retainer ring is propped against the compression spring, so that the lifting spring is compressed to a certain extent.

2. The pressure regulating valve according to claim 1, wherein said central shaft is provided with a mounting groove along a circumferential direction at a coupling position with a retainer ring, said retainer ring is elastically deformable in a radial direction, and said retainer ring is radially expanded and then is fitted into said mounting groove to be fixed.

3. The pressure regulating valve according to claim 1 or 2, wherein a cavity is provided in the central shaft, and the valve core is movably mounted at the end of the central shaft through the cavity and can slide up and down along the axis of the cavity within a certain travel range, and the top end of the valve core and the end of the central shaft are mutually engaged to form a limiting part, so that the valve core cannot be separated from the cavity.

4. The pressure regulating valve according to claim 3, wherein said valve body further comprises a helical guide and a pressure spring, wherein,

the spiral guide piece is internally provided with a central hole corresponding to the central shaft, the cross sections of the central shaft and the central hole are in non-circular design, and the central shaft and the central hole are matched with each other, so that the shell and the spiral guide piece are relatively fixed in the rotating direction, but can relatively move up and down;

the inner surface of the inner shell is provided with a connecting component which is matched with the external thread of the spiral guide piece, so that the spiral guide piece moves up and down in the axial direction of the inner shell while rotating;

one end of the pressure spring is propped against the lower surface of the spiral guide piece, and the other end of the pressure spring is propped against the upper surface of the valve core;

when the outer shell is rotated, the outer shell drives the spiral guide piece to rotate, so that the spiral guide piece moves up and down in the axial direction of the inner shell while rotating, the change of the distance between the spiral guide piece and the valve core is realized, the compression degree of the pressure spring is controlled, and the opening pressure is adjusted.

5. The pressure regulating valve as set forth in claim 4, wherein said connection assembly is a pin connection or a threaded connection.

6. The pressure regulating valve according to claim 3, wherein said housing surface is provided with a scale characterizing the opening pressure, wherein said scale is arranged such that the actual opening pressure, the compression of the pressure spring, corresponds to the indication of the scale.