Pressure relief valve and anesthesia machine

Abstract

A pressure relief valve and an anesthesia machine, the pressure relief valve comprising an operating part (3), a valve body (11), a valve seat (12), an electric control part and a valve core assembly; at least part of the structure of the operating part (3) is arranged outside the valve body (11); the valve seat (12) has a valve port (12a); the valve core assembly comprises a valve piece (21) and a first elastic member (22), the first elastic member (22) can exert a force on the valve piece (21) towards the valve port (12a) under the drive of the operating part (3); the electric control part selectively inputs a driving force to the valve core assembly, the valve seat (12) or the operating part (3) to change the interaction force between the valve piece (21) and the valve port (12a). In the automatic state, the electric control part inputs the driving force, and the valve piece (21) closes the valve port (12a) under the action of the driving force; in the manual state, the electric control part has no power input. When the anesthesia machine performs self-checking, the electric control part inputs the driving force through the system program, and the APL valve is switched from the manual state to the automatic state without manual intervention of the APL valve, realizing full-automatic self-checking of the anesthesia machine.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical apparatuses, and in particular to a pressure relief valve and an anesthesia machine. BACKGROUND

[0002] An anesthesia machine plays a function of delivering anesthetic and maintaining ventilation of a patient during a surgery process of the patient, and plays a vital role in whether the surgery can be normally performed and safety of the patient. Therefore, the anesthesia machine needs to be self-checked in multiple aspects before work. Gas leakage of the anesthesia machine not only relates to safety of the patient, but also can cause adverse effects on a doctor. Therefore, leakage self-checking is a very important link in the self-checking process before work of the anesthesia machine.

[0003] According to a working state of the anesthesia machine, the leakage self-checking usually includes leakage self-checking in a machine control state and leakage self-checking in a manual state. The anesthesia machine can already realize full-automatic self-checking in the machine control state. The manual circuit of the anesthesia machine includes an adjustable pressure relief valve (referred to as an APL valve for short). In related clinical applications, before self-checking in the manual state, the doctor needs to manually adjust the APL valve to a pressure limit value greater than 30 cmH2O in advance, and then the leakage self-checking process in the manual state can be completed. Moreover, after the self-checking is completed, the doctor usually needs to manually adjust the APL valve to return to an SP position, for use in a process such as induction before the surgery of the patient. That is, full-automatic self-checking of the anesthesia machine is difficult to realize, the doctor needs to frequently operate the APL valve before and after the self-checking in the manual state, and the operation steps of the self-checking process of the anesthesia machine are relatively complex. As such, not only the burden of the doctor is increased, but also a safety risk can be caused to the patient due to a misoperation. SUMMARY

[0004] Therefore, an embodiment of the present application expects to provide a pressure relief valve capable of realizing automatic control and manual control and an anesthesia machine.

[0005] To achieve the above object, a first aspect of an embodiment of the present application provides a pressure relief valve, comprising an operation part, a valve body, a valve seat, an electric control part and a valve core assembly; at least part of a structure of the operation part is arranged outside the valve body; the valve seat has a valve port; the valve core assembly comprises a valve sheet and a first elastic member, the first elastic member can exert an acting force on the valve sheet toward the valve port under driving of the operation part; the electric control part selectively inputs a driving force to the valve core assembly, the valve seat or the operation part, so as to change an interaction force between the valve sheet and the valve port.

[0006] A second aspect of this application provides an anesthesia machine, including a breathing circuit, a manual branch, and a controller. The manual branch is connected to the breathing circuit. The manual branch includes the aforementioned pressure relief valve, which regulates the air pressure in the manual branch. The controller is electrically connected to the electric control unit to control the electric control unit to input the driving force.

[0007] The APL valve in this embodiment includes an automatic state and a manual state. When the APL valve is in automatic state, the electric control unit inputs the aforementioned driving force, and the valve plate closes the valve port under the action of the driving force to form a predetermined sealing force. When the APL valve is in manual state, the electric control unit receives no power input, and the sealing force of the valve plate is determined by the aforementioned first elastic element. Specifically, when the anesthesia machine needs to perform a leak self-check on the gas circuit, including the manual branch, the anesthesia machine can control the electric control unit to input driving force through the system program, and the APL valve switches from manual state to automatic state. During the leak self-check process of the anesthesia machine, no manual intervention is required for the APL valve, enabling fully automatic leak self-checking of the anesthesia machine. Attached Figure Description

[0008] Figure 1 This is a simplified structural diagram of the APL valve according to the first embodiment of this application;

[0009] Figure 2 for Figure 1 A schematic diagram of another state of the structure shown;

[0010] Figure 3 This is a simplified structural diagram of the APL valve according to the second embodiment of this application;

[0011] Figure 4 This is a simplified structural diagram of the APL valve according to the third embodiment of this application;

[0012] Figure 5 This is a simplified structural diagram of the APL valve according to the fourth embodiment of this application;

[0013] Figure 6 for Figure 5 A schematic diagram of another state of the structure shown;

[0014] Figure 7 This is a simplified structural diagram of the APL valve according to the fifth embodiment of this application;

[0015] Figure 8 This is a simplified structural diagram of the APL valve according to the sixth embodiment of this application;

[0016] Figure 9 This is a simplified structural diagram of the APL valve according to the seventh embodiment of this application;

[0017] Figure 10Simplified structure diagram of APL valve of the eighth embodiment of the present application;

[0018] Figure 11 Simplified structure diagram of APL valve of the ninth embodiment of the present application;

[0019] Figure 12 Simplified structure diagram of APL valve of the tenth embodiment of the present application;

[0020] Figure 13 Simplified structure diagram of APL valve of the eleventh embodiment of the present application; Figure 12 Simplified structure diagram of APL valve of the twelfth embodiment of the present application;

[0021] Figure 14 Simplified structure diagram of APL valve of the eleventh embodiment of the present application;

[0022] Figure 15 Simplified structure diagram of APL valve of the twelfth embodiment of the present application;

[0023] Figure 16 Simplified structure diagram of APL valve of the eleventh embodiment of the present application;

[0024] Explanation of reference numerals

[0025] Valve body 11; valve seat 12; valve port 12a; accommodating cavity 11a; first port 11b; second port 11d; mounting hole 11f; flexible structure 110; valve piece 21; first elastic member 22; limiting member 23; drive rod body 25; operation part 3; second transmission tooth structure 3b; first electromagnetic valve 41; first air inlet 41a; first working port 41b; first air outlet 41c; second electromagnetic valve 42; second air inlet 42a; second air outlet 42b; pressure release port 43; sealing plate 44; first magnetic attraction member 451; first magnetic matching member 452; second magnetic attraction member 461; second magnetic matching member 462; pressure sensor 47; linear motor 48; mover 481; first rotary motor 49'; first rotating shaft 491; first transmission tooth structure 491a; second rotary motor 49"; second rotating shaft 492; transmission belt 49'"; first pipeline 401; second pipeline 402; manual branch 1000; machine-controlled branch 2000; breathing circuit 3000; manual and machine-controlled switching valve 5000; controller 6000; pressure release valve 100; air storage bag 200 DETAILED DESCRIPTION

[0026] It should be noted that the embodiments in the present application and the technical features in the embodiments can be combined with each other without conflict, and the detailed description in the specific embodiments should be understood as the explanation and description of the purpose of the present application, and should not be regarded as improper limitation of the present application.

[0027] In the description of the embodiments of the present application, "upper", "lower", orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, it should be understood that these orientation terms are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. Figure 1

[0028] The embodiments of the present application provide an APL valve, please refer to Figure 1 The APL valve includes an operating part 3, a valve body 11, a valve seat 12, an electric control part and a valve core assembly. At least part of the structure of the operating part 3 is arranged outside the valve body 11, so as to facilitate manual operation of the user; the valve seat 12 has a valve port 12a; the valve core assembly includes a valve disc 21 and a first elastic member 22, the first elastic member 22 can exert a force on the valve disc 21 towards the valve port 12a under the drive of the operating part 3. It should be noted that the first elastic member 22 can directly act on the valve disc 21, or indirectly act on the valve disc 21 through other structures, which is not limited here.

[0029] The electric control part selectively inputs driving force to the valve core assembly, the valve seat 12 or the operating part 3, so as to change the interaction force between the valve disc 21 and the valve port 12a. The force exerted by the valve disc 21 on the valve port 12a is also called sealing valve force.

[0030] The APL valve is connected to the gas circuit, the gas pressure entering the valve port 12a forms a force on the valve disc 21 opposite to the sealing valve force. When the force formed by the gas pressure entering the valve port 12a on the valve disc 21 is less than or equal to the sealing valve force, the valve disc 21 will not be pushed open, that is, the valve port 12a is in a closed state; when the force formed by the gas pressure entering the valve port 12a on the valve disc 21 is greater than the sealing valve force, the valve disc 21 is pushed open, and the excess gas is discharged through the valve port 12a, at this time, the APL valve plays a pressure relief role.

[0031] It should be noted that the electric control part refers to automatically inputting the above-mentioned driving force after receiving the electric signal, without manual operation.

[0032] ​Specifically, the APL valve includes an automatic state and a manual state. When the APL valve is in the automatic state, the electric control unit inputs the driving force, and the valve disc 21 closes the valve port 12a under the action of the driving force to form a predetermined sealing force. When the APL valve is in the manual state, the electric control unit is not powered, and the sealing force of the valve disc 21 is determined by the first elastic member 22. Specifically, a user manually operates the operation unit 3, the operation unit 3 forces the first elastic member 22 to stretch and contract, thereby changing the pre-tightening force of the first elastic member 22 on the valve disc 21, and the sealing force between the valve disc 21 and the valve port 12a is changed. It should be noted that when the pre-tightening force of the first elastic member 22 on the valve disc 21 is 0, the valve disc 21 can abut against the valve port 12a under the action of its own gravity.

[0033] The application field of the APL valve of the embodiment of the present application is not limited, and the APL valve is described by taking the application of the APL valve to an anesthetic machine as an example.

[0034] In an embodiment, referring to Figure 16 , the anesthetic machine includes a breathing circuit 3000, a manual branch 1000, a controller 6000, and the APL valve 100 of the embodiment of the present application. The manual branch 1000 is connected to the breathing circuit 3000, the APL valve 100 is arranged on the manual branch 1000 to regulate the air pressure on the manual branch 1000, and the controller 6000 is electrically connected to the electric control unit to control the electric control unit to input the driving force. That is, the controller 6000 controls the APL valve 100 to switch between the automatic state and the manual state.

[0035] Specifically, when the anesthetic machine needs to perform a leak self-check on an air circuit including the manual branch 1000, the anesthetic machine can control the electric control unit to input the driving force through a system program, and the APL valve switches from the manual state to the automatic state. It should be noted that the size of the driving force can be set by the system program or can be pre-set by other structures, and the system program only controls the state switching of the APL valve.

[0036] In the automatic state, during the leak self-check, the sealing force needs to ensure that the air pressure in the manual branch 1000 cannot push open the valve disc 21. After the leak self-check is completed, the electric control unit stops power input, the above-mentioned driving force disappears, and the APL valve switches from the automatic state to the manual state.

[0037] It should be noted that the APL valve is only effective when manually breathing, and can be used to adjust the upper limit of the inspiratory pressure. Specifically, the manual branch 1000 is provided with an air reservoir 200, and when the user manually squeezes the air reservoir 200 too hard, the APL valve can exhaust the excess gas to prevent airway pressure injury.

[0038] It should be noted that the above-mentioned anesthesia machine can support both machine control mode and manual control mode. In an embodiment, the anesthesia machine further comprises a machine control branch 2000 and a manual-machine control switch valve 5000, which can selectively connect the breathing circuit 3000 to the machine control branch 2000 or the manual branch 1000. In the machine control mode, the machine control branch 2000 is connected to the breathing circuit 3000; in the manual mode, the manual branch 1000 is connected to the breathing circuit 3000. After the anesthesia machine completes the self-checking in the machine control mode, the anesthesia machine can automatically switch the APL valve to the automatic state through the system program setting, so that the anesthesia machine automatically completes the leak self-checking in the manual control mode. Therefore, during the leak self-checking of the anesthesia machine, no manual intervention of the APL valve is required, and full-automatic leak self-checking can be achieved.

[0039] The connection mode of the valve body 11 and the valve seat 12 described above is not limited, which can be fixed connection, such as threaded connection, etc., or movable connection.

[0040] The valve piece 21 is arranged between the valve body 11 and the valve port 12a, and the valve piece 21 and the valve port 12a have relative movement to selectively open or close the valve port 12a.

[0041] The above-mentioned sealing valve force needs to be kept in a suitable range. If the sealing valve force is too small, the valve piece 21 is likely to be pushed open when there is a little pressure fluctuation in the manual branch. If the sealing valve force is too large, the valve port 12a may be deformed or excessively worn, etc. For example, 28cmH2O-35cmH2O.

[0042] For example, in some embodiments, referring to Figure 1 , the valve body 11 and the valve seat 12 are fixedly connected, i.e. there is no relative movement between the valve body 11 and the valve seat 12, the valve body 11 has a flexible structure 110, and the valve piece 21 is connected to the flexible structure 110. The flexible structure 110 can be a diaphragm, etc., which can elastically deform under external force to drive the valve piece 21 to move. It should be noted that the above-mentioned first elastic member 22 can act on the flexible structure 110 to apply force to the valve piece 21 through the flexible structure 110. Of course, other structural members can also be arranged in the valve body 11, and the first elastic member 22 can abut against the flexible structure 110.

[0043] In another embodiment, referring to Figure 11The valve body 11 and the valve seat 12 are separated, and the valve body 11 and the valve seat 12 can move relatively. The valve core assembly further comprises a driving rod body 25, the valve body 11 is provided with a mounting hole 11f, the driving rod body 25 is slidably arranged in the mounting hole 11f, and the first elastic member 22 applies a force to the valve disc 21 towards the valve port 12a through the driving rod body 25. In this embodiment, the valve body 11 and the valve seat 12 can be slidably connected through a mounting bracket (not shown in the figure). The valve disc 21 can be movably arranged on the mounting bracket and be acted on by the driving rod body 25.

[0044] Exemplarily, the valve port 12a is circular, and the end face of the valve disc 21 for sealing the valve port 12a is substantially circular.

[0045] Exemplarily, referring to Figure 1 The operating part 3 is a knob cover, one end of the valve body 11 away from the valve seat 12 is open, the knob cover is arranged on the outer side of the valve body 11 and covers the open side of the valve body 11, and the knob cover is rotationally connected with the valve body 11 to adjust the pre-tightening force of the first elastic member 22 on the valve disc 21. That is to say, during the rotation of the knob cover, the first elastic member 22 is directly or indirectly driven to stretch or contract, so as to change the pre-tightening force of the first elastic member 22 on the valve disc 21.

[0046] Exemplarily, after the self-checking of the anesthesia machine is completed, the APL valve is in the SP position, that is, the pre-tightening force of the first elastic member 22 on the valve disc 21 is almost 0, and the valve disc 21 relies on its own gravity to abut against the valve port 12a. This state can be used for the induction process before the operation of the patient, that is, after the self-checking is completed, the user does not need to manually adjust the APL valve.

[0047] The form of the driving force is not limited, and various embodiments of the present application are introduced in combination with the accompanying drawings.

[0048] First embodiment

[0049] Exemplarily, referring to Figure 1 and Figure 2 In this embodiment, the valve body 11 is fixedly connected with the valve seat 12, the side of the valve body 11 towards the valve seat 12 has a flexible structure 110, the valve disc 21 is connected with the flexible structure 110, and the valve disc 21 is arranged between the valve body 11 and the valve port 12a.

[0050] The valve body 11 has a containing cavity 11a, which is a relatively closed space. The valve body 11 has a first port 11b in communication with the containing cavity 11a. The position of the first port 11b is not limited, for example, in this embodiment, the first port 11b is arranged on the side of the valve body 11 towards the valve seat 12.

[0051] The electric control unit comprises a first electromagnetic valve 41, the first electromagnetic valve 41 comprises a first gas inlet 41a communicated with the gas source and a first working port 41b communicated with the first port 11b, the first electromagnetic valve 41 can selectively connect the first working port 41b and the first gas inlet 41a to introduce the driving gas into the accommodating cavity 11a, so that the driving gas exerts the driving force on the valve disc 21.

[0052] It should be noted that the first electromagnetic valve 41 can selectively connect the first working port 41b and the first gas inlet 41a, which means that the first electromagnetic valve 41 can connect the first working port 41b and the first gas inlet 41a, or not connect the first working port 41b and the first gas inlet 41a.

[0053] The gas source can be any gas source with a certain pressure, and the type of the gas source is not limited, for example, it can be any one or more of oxygen, air, laughing gas, and other types of gas sources, which are not limited here.

[0054] The first working port 41b can be connected with the first port 11b through the first pipeline 401, or the first electromagnetic valve 41 can be directly installed at the first port 11b, which is not limited here.

[0055] When the anesthesia machine needs to perform the leakage self-check in the manual control state, the APL valve is in the automatic state, please refer to Figure 1 , the controller 6000 controls the first electromagnetic valve 41 to be powered, the first electromagnetic valve 41 connects the first gas inlet 41a and the first working port 41b, and the gas of the gas source enters the accommodating cavity 11a through the first electromagnetic valve 41.

[0056] The driving gas establishes a certain gas pressure in the accommodating cavity 11a, which acts on the flexible structure 110, forcing the flexible structure 110 to bulge towards the valve port 12a, and then pressing the valve disc 21 against the valve port 12a, the size of the sealing valve force between the valve disc 21 and the valve port 12a depends on the size of the gas pressure in the accommodating cavity 11a, therefore, controlling the size of the gas pressure in the accommodating cavity 11a can control the sealing valve force.

[0057] It should be noted that the gas pressure in the accommodating cavity 11a needs to ensure that the valve disc 21 will not be pushed open by the working gas in the leakage self-check process.

[0058] During the leakage self-check process of the anesthesia machine, the gas pressure in the accommodating cavity 11a needs to be relatively stable and cannot fluctuate greatly. In order to maintain the gas pressure in the accommodating cavity 11a within the target pressure range, in the embodiment, the APL valve comprises a pressure release port 43 communicated with the accommodating cavity 11a to maintain the gas pressure in the accommodating cavity 11a within the target pressure range.

[0059] The pressure release port 43 can be arranged at any suitable position, for example, please refer to Figure 1 and Figure 2 The pressure release port 43 is arranged on the first pipeline 401 between the first solenoid and the first port 11b.

[0060] The gas in the accommodating cavity 11a can be discharged through the pressure release port 43. The aperture of the pressure release port 43 is matched with the pressure of the gas source. Specifically, please refer to Figure 1 When the first solenoid valve 41 is turned on to connect the first gas inlet port 41a and the first working port 41b, the gas from the gas source enters the accommodating cavity 11a, and part of the gas in the accommodating cavity 11a is discharged through the pressure release port 43, that is, the flow rate of the gas entering the accommodating cavity 11a and the flow rate of the gas discharged through the pressure release port 43 need to be balanced to maintain the pressure in the accommodating cavity 11a within the target pressure range.

[0061] In order to prevent the above-mentioned driving gas from interfering with the movement of the valve disc 21 in the manual state, it is necessary to discharge the above-mentioned driving gas in the accommodating cavity 11a from the accommodating cavity 11a in the manual state, so that the pressure in the accommodating cavity 11a is maintained at atmospheric pressure. When the above-mentioned first solenoid valve 41 is not turned on to connect the first gas inlet port 41a and the first working port 41b, that is, the accommodating cavity 11a is no longer filled with gas, the existing gas in the accommodating cavity 11a will slowly discharge from the pressure release port 43 until the pressure in the accommodating cavity 11a is atmospheric pressure.

[0062] It should be noted that the gas discharged from the pressure release port 43 can be directly discharged to the atmosphere, or can be connected to the waste gas system of the anesthesia machine through a pipeline to avoid polluting the indoor environment.

[0063] In an embodiment, the driving gas in the accommodating cavity 11a can be quickly discharged through the first solenoid valve 41. Specifically, the first solenoid valve 41 further comprises a first exhaust port 41c, and the first solenoid valve 41 selectively connects the first gas inlet port 41a and the first working port 41b, or connects the first working port 41b and the first exhaust port 41c to discharge the driving gas in the accommodating cavity 11a. Please refer to Figure 1 When the APL valve is in the automatic state, the first solenoid valve 41 is powered on, the first gas inlet port 41a is connected to the first working port 41b, and the first exhaust port 41c is in a closed state at this time. The gas from the gas source enters the accommodating cavity 11a through the first solenoid valve 41. When the APL valve is in the manual state, please refer to Figure 2 The first solenoid valve 41 is powered off, the first exhaust port 41c and the first working port 41b are connected to discharge the driving gas in the accommodating cavity 11a, and at this time, the first gas inlet port 41a is in a closed state. The pressure in the accommodating cavity 11a can be quickly released through the first exhaust port 41c, and the APL valve can be switched to the manual state in a short time.

[0064] Second embodiment

[0065] Referring to Figure 3 , the structure of this embodiment is mostly the same as the first embodiment, and the difference from the first embodiment is that the pressure release port 43 is arranged on the second pipeline 402 that communicates with the accommodating cavity 11a.

[0066] Third embodiment

[0067] Referring to Figure 4 , the structure of this embodiment is mostly the same as the first embodiment, and the difference from the first embodiment is that the pressure release port 43 is arranged on the valve body 11.

[0068] Fourth embodiment

[0069] Referring to Figure 5 and Figure 6 , in this embodiment, the main structure of the valve body 11, the valve seat 12 and the valve core assembly is basically the same as the first embodiment, and the difference is that in this embodiment, the rapid exhaust is realized by another electromagnetic valve.

[0070] The APL valve comprises a second electromagnetic valve 42, which comprises a second inlet port 42a and a second outlet port 42b, the second inlet port 42a communicates with the first port 11b, and the second outlet port 42b can directly exhaust to the surrounding environment or can be connected to the exhaust system of the anesthesia machine through a pipeline. The second electromagnetic valve 42 selectively cuts off the passage between the second inlet port 42a and the second outlet port 42b, or conducts the second inlet port 42a and the second outlet port 42b to depressurize the accommodating cavity 11a.

[0071] When the APL valve is in the automatic state, referring to Figure 5 , the first electromagnetic valve 41 is powered on, the first electromagnetic valve 41 conducts the first inlet port 41a and the first working port 41b, the second electromagnetic valve 42 is powered off, the passage between the second inlet port 42a and the second outlet port 42b of the second electromagnetic valve 42 is cut off, at this time, the accommodating cavity 11a is filled with gas through the first electromagnetic valve 41.

[0072] When the APL valve is in the manual state, referring to Figure 6 , the first electromagnetic valve 41 is powered off, the passage between the first inlet port 41a and the first working port 41b is cut off, the second electromagnetic valve 42 is powered on, the second electromagnetic valve 42 conducts the second inlet port 42a and the second outlet port 42b to guide the driving gas in the accommodating cavity 11a out, realizing the rapid depressurization of the accommodating cavity 11a. That is, in this embodiment, the first electromagnetic valve 41 plays the role of a switch valve, and the second electromagnetic valve 42 also plays the role of a switch valve.

[0073] Fifth embodiment

[0074] Please refer to Figure 7 In this embodiment, the main structure of the valve body 11, the valve seat 12 and the valve core assembly is basically the same as the first embodiment, except that the type of the first electromagnetic valve 41 and the gas pressure control mode in the containing cavity 11a are different.

[0075] Specifically, the APL valve includes a pressure sensor 47 for detecting the gas pressure in the containing cavity 11a. The setting position of the pressure sensor 47 is not limited, which can be in the containing cavity 11a, or on the first pipeline 401 between the first working port 41b and the first port 11b, or on other pipelines connected with the containing cavity 11a, which is not limited here.

[0076] The first electromagnetic valve 41 can adjust the opening of its valve core according to the detection result of the pressure sensor 47. For example, the first electromagnetic valve 41 is an electric proportional valve, which can control the opening of its valve core according to the electric signal and further control the gas flow through the first electromagnetic valve 41.

[0077] The pressure sensor 47 detects the pressure in the containing cavity 11a, and the controller receives the detection result of the pressure sensor 47 and controls the opening of the valve core of the first electromagnetic valve 41 according to the detection result. Specifically, when the gas pressure in the containing cavity 11a gradually increases, the opening of the valve core of the first electromagnetic valve 41 can be adaptively reduced, and when the gas pressure in the containing cavity 11a is within the target pressure range, the valve core of the first electromagnetic valve 41 is closed, and the gas in the containing cavity 11a is in a pressure holding state, at this time the containing cavity 11a neither charges nor discharges.

[0078] When the APL valve is switched from the automatic state to the manual state, the way to release the pressure of the gas in the containing cavity 11a is the same as the first embodiment, that is, in the embodiment provided with the pressure release port 43, the pressure can be slowly released through the pressure release port 43. It can also be discharged through the second electromagnetic valve 42 in the fourth embodiment, or through the first electromagnetic valve 41 itself.

[0079] For example, the first electromagnetic valve 41 is a three-position three-way electromagnetic valve, when the first electromagnetic valve 41 loses power, please refer to Figure 7 , the first electromagnetic valve 41 is in the first working position, the first working port 41b is in communication with the first exhaust port 41c, and the gas pressure in the containing cavity 11a is atmospheric pressure. When the first electromagnetic valve 41 is powered on, the first electromagnetic valve 41 is in the second working position, the first inlet port 41a and the first working port 41b are in communication, and the containing cavity 11a is charged through the first electromagnetic valve 41, and the opening of the valve core of the first electromagnetic valve 41 can be adjusted when in the second working position. When the gas pressure in the containing cavity 11a is within the target pressure range, the first electromagnetic valve 41 is in the third working position, and the first working port 41b, the first inlet port 41a and the first exhaust port 41c are all closed.

[0080] Sixth embodiment

[0081] The structure of this embodiment is mostly the same as the first embodiment, except that the gas pressure control mode in the accommodating cavity 11a is different.

[0082] Please refer to Figure 8 In this embodiment, the valve body 11 has a second port 11d which is in communication with the accommodating cavity 11a, and the APL valve includes a sealing plate 44 and a second elastic member (not shown in the figure), the sealing plate 44 is arranged at the second port 11d outside the valve body 11, and the second elastic member is connected between the sealing plate 44 and the valve body 11 to drive the sealing plate 44 to move.

[0083] The sealing plate 44 includes a sealing position which seals the second port 11d and an avoiding position which avoids the second port 11d; when the gas pressure in the accommodating cavity 11a is greater than or equal to a first preset value, the sealing plate 44 switches from the sealing position to the avoiding position; when the gas pressure in the accommodating cavity 11a is less than the first preset value, the second elastic member drives the sealing plate 44 to switch from the avoiding position to the sealing position.

[0084] That is to say, in this embodiment, the gas pressure in the accommodating cavity 11a mainly depends on the elastic force of the second elastic member and the area of the second port 11d. Specifically, the gas pressure in the accommodating cavity 11a exerts a force F1 on the sealing plate 44 along the Figure 8 downward direction, the size of the force F1 is the area of the second port 11d multiplied by the gas pressure in the accommodating cavity 11a, and the second elastic member exerts a force F2 on the sealing plate 44 along the Figure 8 upward direction. When the gas pressure in the accommodating cavity 11a is less than the first preset value, F2 is greater than F1, and the sealing plate 44 is in the sealing position. When the gas pressure in the accommodating cavity 11a is equal to the first preset value, F2 is equal to F1, and the sealing plate 44 is still in the sealing position. When the gas pressure in the accommodating cavity 11a is greater than the first preset value, F2 is greater than F1, and the sealing plate 44 switches from the sealing position to the avoiding position, and the excess gas in the accommodating cavity 11a is discharged through the second port 11d.

[0085] It can be understood that the first preset value is within the target gas pressure range.

[0086] When the APL valve needs to switch from the automatic state to the manual state, it can be discharged through the first electromagnetic valve 41 or the second electromagnetic valve 42 in the first embodiment, which is not limited here.

[0087] The specific type of the second elastic member is not limited as long as it can drive the sealing plate 44 to move. For example, in one embodiment, the second elastic member is a torsion spring; in another embodiment, the second elastic member is a compression spring, which is arranged outside the valve body 11, one end of the compression spring abuts against the valve body 11, and the other end of the compression spring abuts against the side of the sealing plate 44 away from the accommodating cavity 11a. In still another embodiment, the second elastic member is a tension spring, which is arranged in the accommodating cavity 11a, one end of the tension spring is connected to the valve body 11, and the other end of the tension spring is connected to the side of the sealing plate 44 facing the accommodating cavity 11a, and the tension spring exerts a pulling force on the sealing plate 44.

[0088] The specific shape of the sealing plate 44 is not limited, which can be flat or umbrella-shaped, etc.

[0089] Seventh Embodiment

[0090] Please refer to Figure 9 In this embodiment, the valve body 11 is fixedly connected to the valve seat 12, the flexible structure 110 is connected to the valve disc 21, and the valve disc 21 is arranged between the valve body 11 and the valve port 12a. In this embodiment, the electromagnetic force is used as the driving force.

[0091] The electric control part includes a first magnetic attraction member 451 and a first magnetic cooperation member 452 arranged in the valve body 11, the valve core assembly includes a limiting member 23, one end of the first elastic member 22 away from the valve disc 21 abuts against the limiting member 23, one of the first magnetic cooperation member 452 and the first magnetic attraction member 451 is connected to the limiting member 23, and the other of the first magnetic cooperation member 452 and the first magnetic attraction member 451 is connected to the valve body 11 or the operating part 3; the first magnetic attraction member 451 can form a driving force with the first magnetic cooperation member 452 in the energized state, and the driving force drives the limiting member 23 to move towards the valve disc 21 to increase the pre-tightening force of the first elastic member 22 on the valve disc 21.

[0092] The first magnetic attraction member 451 and the first magnetic cooperation member 452 can be mutually attracted or repelled. Specifically, when the first magnetic attraction member 451 and the first magnetic cooperation member 452 are mutually attracted, the first magnetic cooperation member 452 is made of a ferromagnetic material or is a magnetic attraction member. The specific material of the ferromagnetic material is not limited as long as it is a ferromagnetic material that can be attracted by a magnet, such as iron, cobalt, nickel, etc. When the first magnetic cooperation member 452 and the first magnetic attraction member 451 are mutually repelled, the first magnetic cooperation member 452 is a permanent magnet or a magnetic attraction member.

[0093] It should be noted that the first magnetic attraction member 451 can be made of soft iron or silicon steel material with fast demagnetization, so that the first magnetic attraction member 451 can be quickly magnetized when energized and quickly demagnetized after being de-energized.

[0094] In this embodiment, the first magnetic attraction member 451 is arranged on the valve body 11, and the first magnetic cooperation member 452 is arranged on the limiting member 23.

[0095] When the first magnetic attraction member 451 and the first magnetic cooperation member 452 generate an attractive force, the first magnetic attraction member 451 is arranged on the side of the first magnetic cooperation member 452 close to the valve seat 12. Thus, when the two generate an attractive force, the first magnetic attraction member 451 can attract the limiting member 23 to drive the first elastic member 22 to move towards the valve seat 12, thereby pressing the valve disc 21 against the valve port 12a.

[0096] When the first magnetic attraction member 451 and the first magnetic cooperation member 452 generate a repulsive force, the first magnetic attraction member 451 is arranged on the side of the first magnetic cooperation member 452 away from the valve seat 12. Thus, when the two generate a repulsive force, the first magnetic attraction member 451 can push the limiting member 23 to drive the first elastic member 22 to move towards the valve seat 12, thereby pressing the valve disc 21 against the valve port 12a.

[0097] In a specific implementation, the first magnetic attraction member 451 and the first magnetic cooperation member 452 can be realized by electromagnets, permanent magnets, magnetic coils, etc. that can attract each other.

[0098] In an embodiment, the permanent magnet and the limiting member 23 can be an integrally formed structure, that is, the limiting member 23 also has magnetism.

[0099] Eighth Embodiment

[0100] The structure of this embodiment is mostly the same as that of the seventh embodiment, except that the installation positions of the magnetic attraction member and the magnetic cooperation member are different.

[0101] Please refer to Figure 10 The electric control part includes a second magnetic attraction member 461 and a second magnetic cooperation member 462. One of the second magnetic attraction member 461 and the second magnetic cooperation member 462 is arranged on the valve seat 12, and the other is connected with the valve core assembly or the valve body 11. The second magnetic attraction member 461 can form an attractive force with the second magnetic cooperation member 462 in a powered state, and the attractive force can increase the interaction force between the valve disc 21 and the valve port 12a.

[0102] Specifically, in this embodiment, the second magnetic attraction member 461 is arranged on the valve seat 12, and the second magnetic cooperation member 462 is arranged on the valve core assembly.

[0103] When the second magnetic attraction member 461 is powered, an attractive force is formed between the second magnetic attraction member 461 and the second magnetic cooperation member 462, which drives the valve disc 21 to move towards the valve seat 12 to generate a sealing force between the valve disc 21 and the valve seat 12.

[0104] Meanwhile, the second magnetic attraction member 461 and the second magnetic cooperation member 462 can be realized by electromagnets, permanent magnets, magnetic coils, etc. that can attract each other.

[0105] Ninth Embodiment

[0106] The difference between the present embodiment and the eighth embodiment is that the installation positions of the magnetic attraction member and the magnetic cooperation member are different, and the connection relationship between the valve body 11 and the valve seat 12 is different. As above, the magnetic attraction member and the magnetic cooperation member can be realized by electromagnets, permanent magnets, magnetic coils, etc. that can attract each other.

[0107] Please refer to Figure 11 , the valve body 11 and the valve seat 12 are separated, and the valve body 11 and the valve seat 12 can move relative to each other. The valve core assembly further comprises a driving rod body 25, the valve body 11 is provided with a mounting hole 11f, the driving rod body 25 is slidably arranged in the mounting hole 11f, and the first elastic member 22 applies a force to the valve disc 21 toward the valve port 12a through the driving rod body 25.

[0108] The valve body 11 can be fixed, and the valve seat 12 can move; or the valve seat 12 can be fixed, and the valve body 11 can move. In the present embodiment, the valve body 11 is fixed, and the valve seat 12 can move.

[0109] In the present embodiment, the second magnetic attraction member 461 is arranged on the valve seat 12, and the second magnetic cooperation member 462 is arranged on the valve body 11. When the second magnetic attraction member 461 is energized, an attractive force is formed between the second magnetic attraction member 461 and the second magnetic cooperation member 462, the attractive force drives the valve seat 12 to move toward the valve body 11, so that the end of the driving rod body 25 abuts on the valve disc 21, and then a sealing force is generated.

[0110] Tenth Embodiment

[0111] Please refer to Figure 12 and Figure 13 , the valve body 11 and the valve seat 12 are fixedly connected, the side of the valve body 11 facing the valve seat 12 has a flexible structure 110, the valve disc 21 is connected with the flexible structure 110, and the valve disc 21 is arranged between the valve body 11 and the valve port 12a.

[0112] The electric control part comprises a linear motor 48, the valve core assembly comprises a limiting member 23 arranged in the valve body 11, one end of the first elastic member 22 away from the valve disc 21 abuts against the limiting member 23, the linear motor 48 is arranged between the operating part 3 and the limiting member 23, and the linear motor 48 has a mover 481 capable of linearly extending and retracting; the mover 481 can drive the limiting member 23 to move toward the valve disc 21 to increase the pre-tightening force of the first elastic member 22 on the valve disc 21.

[0113] Specifically, when the APL valve is in an automatic state, please refer toFigure 13 , the mover 481 of the linear motor 48 is in the extended state, the mover 481 pushes the limiting member 23 to move towards Figure 13 , the first elastic member 22 is compressed, the pre-tightening force of the first elastic member 22 on the valve plate 21 is increased, and in turn the sealing force between the valve plate 21 and the valve port 12a is increased. By controlling the extension length of the mover 481 of the linear motor 48, the sealing force between the valve plate 21 and the valve port 12a can be controlled.

[0114] It should be noted that when the APL needs to switch to the manual state, the mover 481 moves upwards along Figure 12 to the initial position shown in Figure 11 to cancel the driving force of the mover 481 on the limiting member 23.

[0115] Eleventh embodiment

[0116] The relative positional relationship between the valve body 11, the valve seat 12 and the valve core assembly in this embodiment is substantially the same as that of the tenth embodiment. The difference is that the structure of the electric control part is different.

[0117] In this embodiment, the specific structure of the operation part 3 is the knob cover described above.

[0118] Please refer to Figure 14 , the electric control part includes a first rotary motor 49', the first rotary motor 49' has a first rotating shaft 491, the circumferential surface of the first rotating shaft 491 is formed with a first transmission tooth structure 491a, the circumferential surface of the knob cover 3 is formed with a second transmission tooth structure 3b, the first transmission tooth structure 491a and the second transmission tooth structure 3b are in meshing transmission, the first rotating shaft 491 drives the knob cover 3 to rotate to increase the pre-tightening force of the first elastic member 22 on the valve plate 21.

[0119] It should be noted that in the manual state, the pre-tightening force of the first elastic member 22 needs to be adjusted by rotating the knob cover 3, that is, in the manual state, the first transmission tooth structure 491a and the second transmission tooth structure 3b cannot interfere with the rotation of the knob cover 3.

[0120] In order to avoid the interference of the first rotating shaft 491 and the first transmission tooth structure 491a on the knob cover 3 in the manual state, in an embodiment, the first rotating shaft 491 can be passively rotated forward and backward in the power-off state of the motor, and the first transmission tooth structure 491a and the second transmission tooth structure 3b are always in meshing transmission in the automatic state and the manual state. For example, in the automatic state, the rotating shaft rotates forward, the first transmission tooth structure 491a drives the knob cover 3 to rotate forward, and the knob cover 3 rotates forward along Figure 14When the first shaft 491 rotates downwardly in the straight line displacement in the automatic state, the knob cover 3 forces the first elastic member 22 to compress. When the self-checking for leakage ends, the first shaft 491 reverses, the first transmission tooth structure 491a drives the knob cover 3 to reverse to the initial position, and then the motor is powered off. In the manual state, during the rotation of the knob cover 3 by the user, the knob cover 3 rotates forward or reversely, the second transmission tooth structure 3b drives the first transmission tooth structure 491a to rotate, and the first shaft 491 is passively rotated forward or reversely.

[0121] In another embodiment, the first transmission tooth structure 491a and the second transmission tooth structure 3b include a meshing state and a disengaging state, and the first shaft 491 can reciprocate in a straight line to switch the first transmission tooth structure 491a and the second transmission tooth structure 3b between the meshing state and the disengaging state, that is, the first shaft 491 can not only rotate, but also linearly move a small distance in the axial direction, so that the first transmission tooth structure 491a and the second transmission tooth structure 3b can be disengaged. Specifically, in the automatic state, the first transmission tooth structure 491a and the second transmission tooth structure 3b are in the meshing state; in the manual state, the first transmission tooth structure 491a and the second transmission tooth structure 3b are in the disengaging state.

[0122] Twelfth embodiment

[0123] In this embodiment, most of the structures are the same as those in the eleventh embodiment.

[0124] Please refer to Figure 15 The electric control part includes a second rotary motor 49” and a transmission belt 49’”, the second rotary motor 49” has a second shaft 492, the transmission belt 49’” connects the second shaft 492 and the knob cover 3, and the second shaft 492 drives the knob cover 3 to rotate through the transmission belt 49’” to increase the pre-tightening force of the first elastic member 22 on the valve plate 21.

[0125] In this embodiment, in the manual state, the second shaft 492 can also be passively rotated forward or reversely to avoid interference with the knob cover 3 in the manual state.

[0126] The various embodiments / implementation modes provided in the present application can be combined with each other without contradiction.

[0127] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various changes and modifications to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pressure relief valve for regulating pressure in a manual branch of an anesthesia machine, the pressure relief valve comprising an operating part, a valve body, a valve seat, an electric control part and a valve core assembly; at least part of the operating part is arranged outside the valve body; the valve seat has a valve port; the valve core assembly comprises a valve disc and a first elastic member, the valve disc is arranged between the valve body and the valve port, and the valve disc and the valve port are movable relative to each other to selectively open or close the valve port, the first elastic member is capable of exerting a force on the valve disc towards the valve port under the drive of the operating part; the electric control part selectively inputs a driving force to the valve core assembly, valve seat or operating part to change the interaction force between the valve disc and the valve port.

2. The pressure relief valve according to claim 1, the valve body has a receiving cavity; the valve disc is arranged between the valve body and the valve port, the valve body has a flexible structure, and the valve disc is connected to the flexible structure.

3. The pressure relief valve according to claim 2, the valve body is provided with a first port communicating with the receiving cavity, and the electric control part comprises a first electromagnetic valve; the first electromagnetic valve comprises a first gas inlet communicating with a gas source and a first working port communicating with the first port, and the first electromagnetic valve selectively connects the first working port and the first gas inlet to introduce driving gas into the receiving cavity, so that the driving gas exerts the driving force on the valve disc.

4. The pressure relief valve according to claim 3, the first electromagnetic valve further comprises a first exhaust port; the first electromagnetic valve selectively connects the first gas inlet and the first working port, or connects the first working port and the first exhaust port to release pressure from the receiving cavity.

5. The pressure relief valve according to claim 3, the electric control part comprises a second electromagnetic valve, the second electromagnetic valve comprises a second gas inlet and a second exhaust port, and the second gas inlet communicates with the first port; the second electromagnetic valve selectively blocks the passage between the second gas inlet and the second exhaust port, or connects the second gas inlet and the second exhaust port to release pressure from the receiving cavity.

6. The pressure relief valve according to any one of claims 3-5, the pressure relief valve comprises a pressure release port communicating with the receiving cavity to maintain the pressure in the receiving cavity within a target pressure range.

7. The pressure relief valve according to any one of claims 3-5, wherein the valve body has a second port in communication with the accommodating cavity, the pressure relief valve comprises a sealing plate arranged at the second port outside the valve body and a second elastic member connected between the sealing plate and the valve body to drive the sealing plate to move, the sealing plate comprises a closed position to close the second port and an avoiding position to avoid the second port; when the air pressure in the accommodating cavity is greater than a first preset value, the sealing plate switches from the closed position to the avoiding position; when the air pressure in the accommodating cavity is less than or equal to the first preset value, the second elastic member drives the sealing plate to switch from the avoiding position to the closed position.

8. The pressure relief valve according to claim 3, wherein the pressure relief valve comprises a pressure sensor to detect the air pressure in the accommodating cavity, and the first electromagnetic valve is capable of adjusting the opening degree of the valve core according to the detection result of the pressure sensor.

9. The pressure relief valve according to claim 1, wherein the electric control part comprises a first magnetic attraction member and a first magnetic cooperation member arranged in the valve body, the valve core assembly comprises a limiting member, one end of the first elastic member away from the valve disc abuts against the limiting member, one of the first magnetic cooperation member and the first magnetic attraction member is connected with the limiting member, and the other of the first magnetic cooperation member and the first magnetic attraction member is connected with the valve body or the operating part; the first magnetic attraction member is capable of forming the driving force between the first magnetic cooperation member in the energized state, and the driving force drives the limiting member to move towards the valve disc to increase the pre-tightening force of the first elastic member on the valve disc.

10. The pressure relief valve according to claim 1, wherein the electric control part comprises a second magnetic attraction member and a second magnetic cooperation member, one of the second magnetic attraction member and the second magnetic cooperation member is arranged on the valve seat; the other of the second magnetic attraction member and the second magnetic cooperation member is connected with the valve core assembly or the valve body; the second magnetic attraction member is capable of forming an attractive force between the second magnetic cooperation member in the energized state, and the attractive force is capable of increasing the interaction force between the valve disc and the valve port.

11. The pressure relief valve according to claim 1, wherein the operating part is a knob cover, one end of the valve body away from the valve seat is open, the knob cover is arranged outside the valve body and covers the open side of the valve body, and the knob cover is rotationally connected with the valve body to adjust the pre-tightening force of the first elastic member on the valve disc.

12. The pressure relief valve according to claim 11, wherein the electric control part comprises a linear motor, the valve core assembly comprises a limiting member arranged in the valve body, one end of the first elastic member away from the valve disc abuts against the limiting member, the linear motor is arranged between the knob cover and the limiting member, and the linear motor has a mover capable of linearly moving; the mover is capable of pushing the limiting member to move towards the valve disc to increase the pre-tightening force of the first elastic member on the valve disc.

13. The pressure relief valve according to claim 11, wherein the electric control unit comprises a first rotary motor having a first rotating shaft, a circumferential surface of the first rotating shaft being formed with a first transmission tooth structure, a circumferential surface of the knob cover being formed with a second transmission tooth structure, the first transmission tooth structure and the second transmission tooth structure being in mesh transmission, the first rotating shaft driving the knob cover to rotate so as to increase the pre-tightening force of the first elastic member on the valve disc.

14. The pressure relief valve according to claim 13, wherein the first rotating shaft is capable of positive rotation and reverse rotation, the first transmission tooth structure and the second transmission tooth structure being in mesh transmission at all times.

15. The pressure relief valve according to claim 13, wherein the first transmission tooth structure and the second transmission tooth structure comprise a meshing state and a disengaging state, the first rotating shaft being capable of linear reciprocating motion so as to switch the first transmission tooth structure and the second transmission tooth structure between the meshing state and the disengaging state.

16. The pressure relief valve according to claim 13, wherein the electric control unit comprises a second rotary motor having a second rotating shaft and a transmission belt, the transmission belt connecting the second rotating shaft and the knob cover, the second rotating shaft driving the knob cover to rotate through the transmission belt so as to increase the pre-tightening force of the first elastic member on the valve disc.

17. The pressure relief valve according to claim 1, wherein the valve body is fixedly connected with the valve seat, the valve body having a flexible structure, the valve disc being connected with the flexible structure; or, the valve body and the valve seat are separated, the valve body and the valve seat being capable of relative movement, the valve core assembly further comprising a driving rod body, the valve body being provided with a mounting hole and the driving rod body being slidingly arranged in the mounting hole, the first elastic member applying an action force to the valve disc through the driving rod body.

18. The pressure relief valve of claim 1, wherein, The pressure relief valve comprises an automatic state and a manual state; when the anesthesia machine is performing a leak self-check, the pressure relief valve is in the automatic state, the electric control unit automatically inputs a driving force to the valve core assembly, valve seat or operation unit so as to keep the valve port closed; after the leak self-check of the anesthesia machine is completed, the pressure relief valve is in the manual state, the electric control unit stops inputting the driving force, and the valve disc and the valve port are capable of relative movement so as to selectively open or close the valve port.

19. An anesthesia machine, comprising: a breathing circuit; a manual branch connected with the breathing circuit; the manual branch comprising the pressure relief valve according to any one of claims 1-18, the pressure relief valve regulating the air pressure in the manual branch, a controller electrically connected with the electric control unit so as to control the electric control unit to input the driving force.

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