Medical breathing gas humidifying and shunting device

Abstract

This invention discloses a medical respiratory gas humidification and diversion device, relating to the field of medical technology. It includes a phase-cancellation dual-metering water supply component, used to structurally cancel the water supply pulsation component induced by gas path pressure ripple in the water supply path at the water supply junction point, to output smooth low-frequency water supply; and an adjustable hydraulic notch pilot component, used to convert the gas path pressure ripple into a hydraulic pilot signal and generate a pilot signal with a set phase shift, to drive the phase-cancellation dual-metering water supply component to form an inverted output. This invention achieves structural ripple cancellation at the junction point by constructing the water supply path as an adjustable notch pilot phase shift network and driving the dual-metering chamber inverted output. Simultaneously, it combines diversion ratio mirror distribution control to achieve branch humidification consistency, thereby suppressing intermittent droplet carrying and diversion humidity imbalance induced by pressure ripple without changing the existing device type.

Description

Technical Field

[0001] This invention relates to the field of medical technology, specifically to a medical breathing gas humidification and diversion device. Background Technology

[0002] Medical respiratory gas humidification systems typically include a humidification unit, a water supply unit, and tubing assemblies to provide patients with respiratory gases at a target humidity level during mechanical ventilation, non-invasive ventilation, or transport ventilation. In existing technologies, the water supply side often employs a miniature pump in conjunction with flow restrictors, one-way valves, buffer chambers, and controllers to achieve continuous or pulsed water supply; the gas side often features a flow splitting structure to form main branches and bypass branches (e.g., monitoring and sampling branches, auxiliary gas supply branches, and testing branches), and flow distribution is achieved through valves and tubing impedance.

[0003] Under most steady-state conditions, existing systems can meet the average humidity control requirements. However, under certain clinical equipment combinations and operating conditions, ventilator control strategies and airway compliance can introduce pressure ripple in specific frequency bands. When this ripple couples with the cavity compliance, tubing elasticity, and valve dynamics of the humidification circuit, the humidification circuit may exhibit pulsating responses at the same frequency or beat frequency as the ripple, leading to intermittent over-feeding and droplet carryover at the humidification interface, which is amplified into transient humidity imbalances in the branch circuits during shunting. This anomaly is sporadic and non-repeatable. Conventional methods such as increasing the flow limit or increasing the buffer cavity significantly reduce the humidity response speed and introduce clean dead space, making it difficult to balance safety and dynamic performance.

[0004] In medical respiratory gas humidification and shunt systems, when the ventilator output gas has pressure ripple in a specific frequency band, and the equivalent impedance parameters of the gas path compliance, humidification structure, and water supply path fall within a narrow window, the liquid path will be excited by the ripple to generate water hammer-like pulsations. This causes the water supply to be injected in an intermittent manner of accumulation and sudden release, which in turn forms droplets at the humidification interface and causes short-term humidity imbalance in the shunt branch. This is difficult to completely eliminate through conventional flow limiting, single-chamber buffering, and average error closed-loop control. At the same time, it is necessary to maintain a rapid response to low-frequency humidity demand and adaptive allocation capability of shunt ratio while suppressing ripple pulsations. Summary of the Invention

[0005] The purpose of this invention is to provide a medical respiratory gas humidification and diversion device to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a medical respiratory gas humidification and diversion device, including a phase cancellation dual metering water supply component, used to structurally cancel the water supply pulsation component induced by the gas path pressure ripple in the water supply path at the water supply confluence point, so as to output smooth low-frequency water supply. An adjustable hydraulic notch pilot assembly is used to convert pneumatic pressure ripple into a hydraulic pilot signal and generate a pilot signal with a set phase shift to drive the phase cancellation dual metering water supply assembly to form an inverted output. The mirrored diversion supply and distribution control component is used to obtain the flow ratio of the diversion branch and distribute the low-frequency water supply target to the corresponding branch according to the flow ratio, so as to reduce the transient humidity imbalance caused by diversion.

[0007] According to the above technical solution, the phase cancellation dual metering water supply component includes a water source 1, a micro diaphragm pump 2, an inlet check valve 3, a filter 4, a water supply distribution manifold 5, a metering branch A6, a metering branch B7, a water supply manifold 8, and a humidification water supply interface 9; wherein, the outlet of the water source 1 is connected to the water supply distribution manifold 5 in sequence via the micro diaphragm pump 2, the inlet check valve 3, and the filter 4, the water supply distribution manifold 5 is connected to the metering branch A6 and the metering branch B7 respectively, the outlets of the metering branch A6 and the metering branch B7 are connected to the water supply manifold 8, the water supply manifold 8 is connected to the humidification water supply interface 9, and the humidification water supply interface 9 is connected to the water supply side of the humidification unit 18; The metering branch A6 includes a metering chamber A61, a three-way solenoid valve A62, a throttling device A63, and a micro accumulator A64. The inlet of the three-way solenoid valve A62 is connected to the water supply distribution manifold 5. The outlet of the metering chamber A61 is connected to the inlet of the three-way solenoid valve A62. The outlet of the three-way solenoid valve A62 is connected to the water supply manifold 8 via the throttling device A63. The micro accumulator A64 is connected between the metering chamber A61 and the three-way solenoid valve A62. Metering branch B7 includes metering chamber B71, three-way solenoid valve B72, throttling device B73 and micro accumulator B74. The inlet end of the three-way solenoid valve B72 is connected to the water supply distribution manifold 5. The outlet of metering chamber B71 is connected to the inlet end of three-way solenoid valve B72. The outlet end of three-way solenoid valve B72 is connected to water supply manifold 8 via throttling device B73. Micro accumulator B74 is connected between metering chamber B71 and three-way solenoid valve B72. The adjustable hydraulic notch wave pilot assembly includes a gas path pressure sensor 10, a diaphragm gas-liquid transducer 11, a direct pilot path 12, a phase-shift pilot path 13, and a pilot pressure relief valve 14. The gas path pressure sensor 10 is located on the gas outlet side of the humidification unit 18. The gas side of the diaphragm gas-liquid transducer 11 is connected to the gas path. The liquid side output of the diaphragm gas-liquid transducer 11 is connected to the inlet of the direct pilot path 12 and the phase-shift pilot path 13. The outlet of the direct pilot path 12 is connected to the pilot end of the three-way solenoid valve A62. The phase-shift pilot path 13 sequentially includes a delay cavity 131, a proportional throttle valve 132, and a damping throttle element 133. The outlet of the phase-shift pilot path 13 is connected to the pilot end of the three-way solenoid valve B72. The pilot pressure relief valve 14 is connected between the common pilot node of the direct pilot path 12 and the phase-shift pilot path 13 and the return liquid path. The mirror-image shunt supply and distribution control component includes a gas splitter 19, a first shunt branch 20, a second shunt branch 21, a first differential pressure sampler 15, a second differential pressure sampler 16, a first differential pressure sensor 151, a second differential pressure sensor 161, and a distribution controller 17. The gas outlet of the humidification unit 18 is connected to the gas splitter 19, which branches off into first shunt branch 20 and second shunt branch 21. First shunt branch 20 is connected to the patient-side interface 22 for shunt distribution. Branch 21 is connected to bypass interface 23. Differential pressure sampling element 15 is set on branch 20 and connected to differential pressure sensor 151. Differential pressure sampling element 16 is set on branch 21 and connected to differential pressure sensor 161. The outputs of differential pressure sensor 151 and differential pressure sensor 161 are respectively input to distribution controller 17. Distribution controller 17 outputs control signals to three-way solenoid valve A62, three-way solenoid valve B72 and proportional throttle valve 132 respectively.

[0008] According to the above technical solution, the working method of the device includes the following steps: S1. Ripple and Flow Rate Acquisition: The gas pressure signal at the gas outlet side of the humidification unit 18 is acquired by the gas pressure sensor 10 and input into the distribution controller 17. The differential pressure signal corresponding to the differential pressure sampling element 15 is acquired by the differential pressure sensor 151 and input into the distribution controller 17. The differential pressure signal corresponding to the differential pressure sampling element 16 is acquired by the differential pressure sensor 161 and input into the distribution controller 17. The distribution controller 17 generates an analysis signal to characterize the pressure ripple based on the gas pressure signal. The distribution controller 17 generates the flow rate ratio information of the first branch 20 and the second branch 21 based on the differential pressure signal. S2, Pilot Phase Shift Tuning: The distribution controller 17 determines the phase shift target based on the main frequency characteristics of the pressure ripple and outputs a control signal to adjust the proportional throttle valve 132 in the phase shift pilot path 13, so that the phase shift pilot path 13 generates a pilot signal with a predetermined phase shift relative to the direct pilot path 12. The diaphragm gas-liquid transducer 11 converts the gas pressure ripple into a hydraulic pilot signal and sends it to the direct pilot path 12 and the phase shift pilot path 13 respectively. The direct pilot signal and the phase shift pilot signal are used to drive the three-way solenoid valve A62 and the three-way solenoid valve B72 respectively. S3, Dual Metering Reverse Output and Merging Cancellation: The distribution controller 17 controls the three-way solenoid valve A62 and the three-way solenoid valve B72 to switch according to a complementary rhythm, so that the metering branch A6 and the metering branch B7 structurally cancel the water supply pulsation component induced by pressure ripple at the water supply manifold 8, and send the canceled water supply to the water supply side of the humidification unit 18 through the humidification water supply interface 9. The complementary rhythm includes the timing coordination of filling and draining of metering chamber A61 and metering chamber B71. The micro accumulator A64 and micro accumulator B74 are used to provide compliance during the metering switching process to reduce water hammer response. S4. Flow Mirror Allocation and Low-Frequency Water Supply Baseline Setting: The allocation controller 17 allocates the system's low-frequency water supply target to the corresponding branch water supply target based on the flow ratio of the first branch 20 and the second branch 21, and sets the low-frequency metering baseline of the metering branch A6 and the metering branch B7 accordingly, so that the moisture supply capacity of the two branch branches remains consistent when the flow changes. The low-frequency metering baseline is achieved by the switching frequency and duty cycle of the three-way solenoid valve A62 and the three-way solenoid valve B72. The allocation result is updated in real time with the change of differential pressure signal and transition is achieved through a smoothing strategy. S5. Abnormal Lockout and Recovery: The distribution controller 17 continuously monitors the negative pressure spikes and abnormal ripple amplification in the gas pressure signal. When the lockout condition is met, it controls the three-way solenoid valve A62 and the three-way solenoid valve B72 to enter the holding state and controls the pilot pressure relief valve 14 to release the pilot pressure to block abnormal water supply and reduce the risk of backflow of contaminants. After the abnormality is resolved, the distribution controller 17 re-executes the pilot phase shift tuning and dual metering reverse phase output according to the preset recovery sequence. During the recovery process, the continuity of water supply distribution and reverse phase timing is maintained to avoid secondary pulsation excitation.

[0009] According to the above technical solution, step S1 includes the following steps S1-1 to S1-3: S1-1, Sampling to obtain the pressure sequence: Allocate controller 17 with sampling period Read the output of the pneumatic pressure sensor 10 to obtain a discrete pressure sequence. ,in The sampling point number; S1-2, DC removal within the window: Distributor controller 17 sets the analysis window length. and set the number of samples within the window Calculate the in-window mean within each analysis window. ,in Used to characterize the DC component of pressure within the analysis window; S1-3, Constructing a ripple analysis sequence: Assigning controller 17 to construct a mean-reducing sequence It is used to characterize the pressure ripple component and serve as the input for the main frequency estimation. The mean-reduction process is used to reduce the interference of average pressure changes on the identification of the ripple main frequency.

[0010] According to the above technical solution, step S2 includes the following steps S2-1 to S2-4: S2-1, Autocorrelation Calculation: The allocation controller 17 performs the following calculations within each analysis window: Calculate the autocorrelation sequence ,in The delay order is... The characterization delay is The correlation strength at each sampling period, wherein the autocorrelation is used to extract the periodic characteristics of the pressure ripple; S2-2, Determining the main delay order: The allocation controller 17 is within a preset delay order range. Calculate one by one inside , take The delay order for achieving the maximum value is denoted as ,in The number of sampling points is an integer and is used to characterize the main period of the pressure ripple; S2-3, Ripple frequency calculation and phase shift target determination: Distribution controller 17 according to... Calculate ripple frequency and according to Determine the target time constant for phase shift , This is used to create a half-cycle delay relative to the direct-to-leader path 12 in the phase-shifting leader path 13, so as to achieve the anti-phase driving condition. S2-4, Phase Shift Pilot Path Tuning: The distribution controller 17 outputs a control signal to adjust the opening of the proportional throttle valve 132 to change the equivalent hydraulic resistance of the phase shift pilot path 13. And make the equivalent time constant of phase shift leader path 13 satisfy ,in The equivalent hydraulic compliance is formed by the elastic compliance of the delayed cavity 131 and the phase shift pilot path 13. The formula is obtained from the system structure parameters and stored in the distribution controller 17. This formula is used to map the main frequency of the pressure ripple measured by the sensor to the tuning target of the proportional throttle valve 132.

[0011] According to the above technical solution, step S3 includes the following steps S3-1 to S3-4: S3-1, Determination of Delay Points: The allocation controller 17 determines the number of delay points based on the previously obtained phase shift target time constant. Calculate the number of discrete delay points ,in Take the integer value and use it to define the drive delay of metering branch B7 relative to metering branch A6; S3-2, Valve-controlled drive sequence generation: Distributor controller 17 generates discrete drive sequences for the three-way solenoid valve A62. It outputs to the three-way solenoid valve A62 and simultaneously generates a discrete drive sequence for the three-way solenoid valve B72. And output to three-way solenoid valve B72), where the two sequences satisfy This delays the valve-controlled switching of metering branch B7 relative to metering branch A6, thereby creating reverse metering conditions. S3-3, Definition of Filling, Draining, and Holding States: Three-way solenoid valves A62 and B72 switch between filling, draining, and holding states under their respective driving sequences. The filling state corresponds to the metering chamber being connected to the water supply distribution manifold 5 to fill the metering chamber. The draining state corresponds to the metering chamber being connected to the water supply manifold 8 and outputting to the water supply manifold through the throttling device. The holding state corresponds to the metering chamber being disconnected from the water supply distribution manifold 5 and the water supply manifold 8 to maintain the stability of the pressure and volume in the metering chamber. S3-4, Merging and offsetting constraint: The distribution controller 17, through the delay drive and complementary switching, makes the instantaneous outputs of metering branch A6 and metering branch B7 at the water supply manifold 8 inversely correlated near the ripple main frequency, thereby reducing the water supply pulsation downstream of the water supply manifold 8 and reducing intermittent water mass injection.

[0012] According to the above technical solution, step S4 includes the following steps S4-1 to S4-3: S4-1, Differential Pressure Measurement and Proportion Calculation: The distribution controller 17 reads the differential pressure corresponding to the differential pressure sampler 15 measured by differential pressure sensor 151 and records it as follows: The differential pressure measured by differential pressure sensor 161 and corresponding to the differential pressure of sampling element 16 is recorded as follows: and according to , Calculate the flow ratio between branch 1 (20) and branch 2 (21), where... Corresponding to branch 120, Corresponding to branch 21, and ; S4-2, Low-frequency total water supply target acquisition: The distribution controller 17 acquires the gas flow signal output by the ventilator and records it as follows: And denoted as the unit gas water demand coefficient corresponding to the set humidification target. Calculate the target total water supply at low frequency ,in The target humidity setpoint is obtained from a table and stored in the distribution controller 17. The above formula is used to map the actual air supply of the ventilator to the required water supply. S4-3, Branch Target and Metering Baseline Mapping: Distribution Controller 17 according to , Calculate the branch water supply targets for branch 20 and branch 21, and set the single-time metered discharge volume as... Afterwards, according to , Obtain the metering baseline frequency of the corresponding branch. , The metering baseline frequency is used to determine the low-frequency switching frequency and duty cycle of the three-way solenoid valve A62 and the three-way solenoid valve B72, so as to maintain the consistency of branch humidity supply when the flow changes. The above formula is used to convert the measured flow state into an executable metering valve control baseline.

[0013] According to the above technical solution, step S5 includes the following steps S5-1 to S5-3: S5-1, Construction of Negative Pressure Peak Criterion: The distribution controller 17 calculates the minimum pressure value within each analysis window. And set the negative pressure peak threshold as ,in The pressure sequence is measured by the pneumatic pressure sensor 10. Used to characterize the intensity of negative pressure peaks within the analysis window; S5-2, Construction of Ripple Anomaly Amplification Criterion: The distribution controller 17 calculates the ripple amplitude index in each analysis window. And set the ripple amplitude threshold to The amplitude index is used to characterize the risk of fluid circuit coupling caused by ripple amplification; S5-3 Locking Execution and Resumption Conditions: When the following conditions are met Or meet When the distribution controller 17 controls the three-way solenoid valves A62 and B72 to enter the holding state and controls the pilot pressure relief valve 14 to open to release the pilot pressure directly reaching the pilot passage 12 and the phase shift pilot passage 13, it simultaneously controls the micro diaphragm pump 2 to stop pumping to block the continued water supply; when the continuous Each analysis window simultaneously satisfies and When this occurs, the distribution controller 17 closes the pilot relief valve 14 and re-executes the phase shift tuning and the anti-phase valve control drive to restore the phase cancellation water supply.

[0014] Compared with existing technologies, the beneficial effects achieved by this invention are as follows: This invention does not rely on simply increasing the flow limit or buffer cavity on the water supply side. Instead, it utilizes existing valves, metering chambers, micro accumulators, and diaphragm transducers to form a hydraulic topology that strongly suppresses specific ripple frequency bands and rapidly passes low-frequency demands. The reverse-phase drive of the dual metering branches directly cancels out ripple components at the water supply junction, suppressing pulsed water mass injection and droplet carryover from the source. An adjustable phase-shift pilot network tunes the notch point online, adapting to different ventilator ripple frequency bands and different pipeline compliances. Mirror-image shunt ratio calculation and water supply allocation ensure consistent humidification capacity between the main branch and the bypass branch under dynamic shunt conditions. Furthermore, a negative pressure spike lockout strategy reduces the risk of contamination backflow and abnormal spraying, thereby improving humidification safety, shunt consistency, and system controllability. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall hydraulic circuit of the present invention; Figure 2 This is a schematic diagram of the mirror-based diversion supply and distribution control component of the present invention. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figure 1 and Figure 2 The present invention provides a technical solution: a medical respiratory gas humidification and diversion device, including a phase cancellation dual metering water supply component, which is used to structurally cancel the water supply pulsation component induced by the gas path pressure ripple in the water supply path at the water supply junction point, so as to output smooth low-frequency water supply. An adjustable hydraulic notch pilot assembly is used to convert pneumatic pressure ripple into a hydraulic pilot signal and generate a pilot signal with a set phase shift to drive the phase cancellation dual metering water supply assembly to form an inverted output. The mirrored diversion supply and distribution control component is used to obtain the flow ratio of the diversion branch and distribute the low-frequency water supply target to the corresponding branch according to the flow ratio, so as to reduce the transient humidity imbalance caused by diversion. The phase-cancelling dual-metering water supply assembly includes a water source 1, a micro diaphragm pump 2, an inlet check valve 3, a filter 4, a water supply distribution manifold 5, a metering branch A6, a metering branch B7, a water supply manifold 8, and a humidification water supply interface 9. The outlet of the water source 1 is connected to the water supply distribution manifold 5 via the micro diaphragm pump 2, the inlet check valve 3, and the filter 4. The water supply distribution manifold 5 is connected to metering branch A6 and metering branch B7 respectively. The outlets of metering branch A6 and metering branch B7 are connected to the water supply manifold 8. The water supply manifold 8 is connected to the humidification water supply interface 9. The humidification water supply interface 9 is connected to the water supply side of the humidification unit 18. The metering branch A6 includes a metering chamber A61, a three-way solenoid valve A62, a throttling device A63, and a micro accumulator A64. The inlet of the three-way solenoid valve A62 is connected to the water supply distribution manifold 5. The outlet of the metering chamber A61 is connected to the inlet of the three-way solenoid valve A62. The outlet of the three-way solenoid valve A62 is connected to the water supply manifold 8 via the throttling device A63. The micro accumulator A64 is connected between the metering chamber A61 and the three-way solenoid valve A62. Metering branch B7 includes metering chamber B71, three-way solenoid valve B72, throttling device B73 and micro accumulator B74. The inlet end of the three-way solenoid valve B72 is connected to the water supply distribution manifold 5. The outlet of metering chamber B71 is connected to the inlet end of three-way solenoid valve B72. The outlet end of three-way solenoid valve B72 is connected to water supply manifold 8 via throttling device B73. Micro accumulator B74 is connected between metering chamber B71 and three-way solenoid valve B72. The adjustable hydraulic notch wave pilot assembly includes a gas path pressure sensor 10, a diaphragm gas-liquid transducer 11, a direct pilot passage 12, a phase-shift pilot passage 13, and a pilot pressure relief valve 14. The gas path pressure sensor 10 is located on the gas outlet side of the humidification unit 18. The gas side of the diaphragm gas-liquid transducer 11 is connected to the gas path. The liquid side output of the diaphragm gas-liquid transducer 11 is connected to the inlet of the direct pilot passage 12 and the phase-shift pilot passage 13. The outlet of the direct pilot passage 12 is connected to the pilot end of the three-way solenoid valve A62. The phase-shift pilot passage 13 sequentially includes a delay cavity 131, a proportional throttle valve 132, and a damping throttle element 133. The outlet of the phase-shift pilot passage 13 is connected to the pilot end of the three-way solenoid valve B72. The pilot pressure relief valve 14 is connected between the common pilot node of the direct pilot passage 12 and the phase-shift pilot passage 13 and the return liquid passage. The mirror-image shunt supply and distribution control assembly includes a gas splitter 19, a first shunt branch 20, a second shunt branch 21, a first differential pressure sampler 15, a second differential pressure sampler 16, a first differential pressure sensor 151, a second differential pressure sensor 161, and a distribution controller 17. The gas outlet of the humidification unit 18 is connected to the gas splitter 19, which branches into first shunt branch 20 and second shunt branch 21. First shunt branch 20 is connected to the patient-side interface 22. The second branch 21 is connected to the bypass interface 23. The differential pressure sampling element 15 is set on the first branch 20 and connected to the first differential pressure sensor 151. The second differential pressure sampling element 16 is set on the second branch 21 and connected to the second differential pressure sensor 161. The outputs of the first differential pressure sensor 151 and the second differential pressure sensor 161 are respectively input to the distribution controller 17. The distribution controller 17 outputs control signals to the three-way solenoid valve A62, the three-way solenoid valve B72 and the proportional throttle valve 132 respectively. When the system is working, water source 1 provides the liquid medium. Miniature diaphragm pump 2 draws liquid from water source 1 and pressurizes it downstream for output. The liquid passes through inlet check valve 3 and filter 4 in sequence before entering water supply distribution manifold 5.

[0018] The inlet check valve 3 is used to restrict the liquid to flow only in the direction of water supply and to suppress the backflow of downstream pressure to the upstream; the filter 4 is used to remove particulate impurities to protect subsequent valves and throttling devices.

[0019] The water distribution manifold 5 stably distributes the upstream water supply to two symmetrical metering branches A6 and B7, providing a unified water source for subsequent dual-metering alternating output.

[0020] During normal operation, the three-way solenoid valves A62 and B72 switch between three operating states under the control of the distribution controller 17, enabling their respective metering chambers to complete a repeatable cycle of filling, draining, and holding. Liquid filling status: The three-way solenoid valve establishes a connection between the metering chamber and the water supply distribution manifold 5, and the metering chamber receives liquid replenishment from the water supply distribution manifold 5 and completes the liquid filling preparation.

[0021] Drainage status: The three-way solenoid valve establishes a connection between the metering chamber and the throttling device. The liquid in the metering chamber is output through the throttling device and enters the water supply manifold 8.

[0022] Maintaining state: The three-way solenoid valve cuts off the connection between the metering chamber and the water supply distribution manifold 5 and the throttling device passage, isolating the metering chamber from the external liquid circuit, so as to ensure the stability of the state inside the metering chamber at the moment of valve switching and avoid undesirable transient flow.

[0023] The micro accumulator A64 is connected between the metering chamber A61 and the three-way solenoid valve A62. It is used to absorb or release pressure fluctuations caused by small volume changes at the moment when the valve switches and the connection is established for drainage, thereby reducing water hammer and pulsation. The micro accumulator B74 plays the same buffering role for the metering chamber B71 and the three-way solenoid valve B72.

[0024] Throttling element A63 and throttling element B73 are used to dampen and shape the drainage process, making the drainage output of each metering branch smoother and preventing spike impacts when the two branches merge at the water supply manifold 8.

[0025] The distribution controller 17 enables metering branches A6 and B7 to operate in a complementary timing sequence: during a certain period, metering branch A6 is in a draining state while metering branch B7 is in a filling or holding state; during subsequent periods, metering branch B7 is in a draining state while metering branch A6 is in a filling or holding state. Through this alternating and complementary operation, the downstream of the water supply manifold 8 receives continuous water supply, while the staggered draining output of the two branches suppresses the tendency of pulsating water masses to be injected due to a single-path water supply, thereby providing more stable water supply conditions for the humidification unit 18.

[0026] The gas side of the diaphragm-type gas-liquid transducer 11 is connected to the gas outlet side of the humidification unit 18, and is used to convert the pressure changes in the gas path into a hydraulic pilot pressure signal through diaphragm isolation. Its liquid side output is connected to the direct pilot passage 12 and the phase-shift pilot passage 13. The direct pilot passage 12 sends the pilot pressure signal directly to the pilot control terminal of the three-way solenoid valve A62, so that the valve core switching of the three-way solenoid valve A62 keeps in sync with the gas path pressure ripple. The phase-shift pilot passage 13 is composed of a delay cavity 131, a proportional throttle valve 132, and a damping throttle element 133 connected in series. It is used to delay and dampen the pilot pressure signal from the diaphragm-type gas-liquid transducer 11 before sending it to the pilot control terminal of the three-way solenoid valve B72, so that the valve core switching of the three-way solenoid valve B72 is staggered relative to the three-way solenoid valve A62 by a predetermined phase. The proportional throttle valve 132, under the control of the distribution controller 17, changes the flow resistance level of the phase-shift pilot passage 13, thereby altering the degree of delay and phase misalignment. The damping throttle element 133 is used to suppress pilot signal spikes and improve pilot loop stability. The delay cavity 131 is used to provide volumetric compliance for the pilot signal, making the phase-shift effect controllable and repeatable. The pilot relief valve 14 is connected between the common pilot node of the direct pilot passage 12 and the phase-shift pilot passage 13 and the return passage. During normal operation, the pilot relief valve 14 remains closed to maintain the pressure build-up and phase tuning conditions of the pilot loop. When it is necessary to release the pilot loop pressure, the pilot relief valve 14 opens, allowing the pilot pressure to flow back to the low-pressure side of the water source 1 via the return passage, thereby achieving rapid release of the pilot pressure.

[0027] Differential pressure sensor 151 and differential pressure sensor 161 input the differential pressure information corresponding to the diversion state into the distribution controller 17, enabling the distribution controller 17 to identify the relative ventilation state changes between diversion branch 20 and diversion branch 21. During normal operation, based on the aforementioned diversion state information, the distribution controller 17 adjusts the operating rhythm of three-way solenoid valve A62 and three-way solenoid valve B72 and the low-frequency water supply baseline, matching the water supply output of the humidification unit 18 with the air diversion state, thereby maintaining the consistency and stability of the humidification supply when the diversion changes.

[0028] The operation of this device includes the following steps: S1. Ripple and Flow Rate Acquisition: The gas pressure signal at the gas outlet side of the humidification unit 18 is acquired by the gas pressure sensor 10 and input into the distribution controller 17. The differential pressure signal corresponding to the differential pressure sampling element 15 is acquired by the differential pressure sensor 151 and input into the distribution controller 17. The differential pressure signal corresponding to the differential pressure sampling element 16 is acquired by the differential pressure sensor 161 and input into the distribution controller 17. The distribution controller 17 generates an analysis signal to characterize the pressure ripple based on the gas pressure signal. The distribution controller 17 generates the flow rate ratio information of the first branch 20 and the second branch 21 based on the differential pressure signal. S2, Pilot Phase Shift Tuning: The distribution controller 17 determines the phase shift target based on the main frequency characteristics of the pressure ripple and outputs a control signal to adjust the proportional throttle valve 132 in the phase shift pilot passage 13, so that the phase shift pilot passage 13 generates a pilot signal with a predetermined phase shift relative to the direct pilot passage 12. The diaphragm gas-liquid transducer 11 converts the gas pressure ripple into a hydraulic pilot signal and sends it to the direct pilot passage 12 and the phase shift pilot passage 13 respectively. The direct pilot signal and the phase shift pilot signal are used to drive the three-way solenoid valve A62 and the three-way solenoid valve B72 respectively. S3, Dual Metering Reverse Output and Merging Cancellation: The distribution controller 17 controls the three-way solenoid valve A62 and the three-way solenoid valve B72 to switch according to a complementary rhythm, so that the metering branch A6 and the metering branch B7 structurally cancel the water supply pulsation component induced by pressure ripple at the water supply manifold 8, and send the canceled water supply to the water supply side of the humidification unit 18 through the humidification water supply interface 9. The complementary rhythm includes the timing coordination of filling and draining of metering chamber A61 and metering chamber B71. The micro accumulators A64 and B74 are used to provide compliance during the metering switching process to reduce water hammer response. S4. Flow Mirror Allocation and Low-Frequency Water Supply Baseline Setting: The allocation controller 17 allocates the system's low-frequency water supply target to the corresponding branch water supply target based on the flow ratio of the first branch 20 and the second branch 21, and sets the low-frequency metering baseline of the metering branch A6 and the metering branch B7 accordingly, so that the moisture supply capacity of the two branch branches remains consistent when the flow changes. The low-frequency metering baseline is achieved through the switching frequency and duty cycle of the three-way solenoid valve A62 and the three-way solenoid valve B72. The allocation result is updated in real time with the change of differential pressure signal and transition is achieved through a smoothing strategy. S5. Abnormal Lockout and Recovery: The distribution controller 17 continuously monitors the negative pressure spikes and abnormal ripple amplification in the gas pressure signal. When the lockout condition is met, it controls the three-way solenoid valve A62 and the three-way solenoid valve B72 to enter the holding state and controls the pilot pressure relief valve 14 to release the pilot pressure to block abnormal water supply and reduce the risk of backflow of contaminants. After the abnormality is resolved, the distribution controller 17 re-executes the pilot phase shift tuning and dual metering reverse phase output according to the preset recovery sequence. During the recovery process, the continuity of water supply distribution and reverse phase timing is maintained to avoid secondary pulsation excitation. Step S1 includes the following steps S1-1 to S1-3: S1-1, Sampling to obtain the pressure sequence: Allocate controller 17 with sampling period Read the output of the pneumatic pressure sensor 10 to obtain a discrete pressure sequence. ,in The sampling point number; S1-2, DC removal within the window: Distributor controller 17 sets the analysis window length. and set the number of samples within the window Calculate the in-window mean within each analysis window. ,in Used to characterize the DC component of pressure within the analysis window; S1-3, Constructing a ripple analysis sequence: Assigning controller 17 to construct a mean-reducing sequence It is used to characterize the pressure ripple component and serve as the input for the main frequency estimation. The mean-reduction process is used to reduce the interference of average pressure changes on the identification of the ripple main frequency. Step S2 includes the following steps S2-1 to S2-4: S2-1, Autocorrelation Calculation: The allocation controller 17 performs autocorrelation calculations within each analysis window. Calculate the autocorrelation sequence ,in The delay order is... The characterization delay is The correlation intensity at each sampling period, and the autocorrelation are used to extract the periodic characteristics of the pressure ripple; S2-2, Determining the main delay order: The allocation controller 17 is within a preset delay order range. Calculate one by one inside , take The delay order for achieving the maximum value is denoted as ,in The number of sampling points corresponding to the main period used to characterize the pressure ripple is an integer. S2-3, Ripple frequency calculation and phase shift target determination: Distribution controller 17 according to... Calculate ripple frequency and according to Determine the target time constant for phase shift , This is used to create a half-cycle delay relative to the direct-to-leader path 12 in the phase-shifting leader path 13, so as to achieve the anti-phase driving condition. S2-4, Phase Shift Pilot Path Tuning: The distribution controller 17 outputs a control signal to adjust the opening of the proportional throttle valve 132 to change the equivalent hydraulic resistance of the phase shift pilot path 13. And make the equivalent time constant of phase shift leader path 13 satisfy ,in The equivalent hydraulic compliance is formed by the elastic compliance of the delayed cavity 131 and the phase shift pilot path 13. The formula is obtained from the system structure parameters and stored in the distribution controller 17. This formula is used to map the main frequency of the pressure ripple measured by the sensor to the tuning target of the proportional throttle valve 132. Conventional solutions to pressure ripple-induced water supply pulsations typically involve increasing flow restriction, enlarging the buffer cavity, or implementing averaging filtering in the controller. These methods either slow down the overall system response, leading to poor humidification tracking, or only create a smooth electrical signal while water hammer and intermittent water mass injection still occur in the liquid path. In this step, the gas path ripple is converted into a hydraulic pilot signal by a diaphragm-type gas-liquid transducer 11. A hydraulic pilot network with a defined phase delay for a specific ripple frequency band is then constructed through a phase-shift pilot path 13. A proportional throttle valve 132 is used to adjust this delay, and a damping throttle element 133 is used to suppress spikes, ensuring that the control action reaching the pilot end of the three-way solenoid valve B72 has a controlled phase misalignment relative to the three-way solenoid valve A62. It transforms ripple from an interference source into a usable synchronous reference and provides adjustable phase conditions for subsequent dual-branch anti-phase output. Instead of taking the conventional route of larger damping / larger buffer, it uses mature components to achieve adjustable phase shift in the hydraulic pilot layer, elevating the problem from passive energy dissipation to phase structural reconstruction. This is an uncommon solution path in the field of humidification water supply links.

[0029] Step S3 includes the following steps S3-1 to S3-4: S3-1, Determination of Delay Points: The allocation controller 17 determines the number of delay points based on the previously obtained phase shift target time constant. Calculate the number of discrete delay points ,in Take the integer value and use it to define the drive delay of metering branch B7 relative to metering branch A6; S3-2, Valve-controlled drive sequence generation: Distributor controller 17 generates discrete drive sequences for the three-way solenoid valve A62. It outputs to the three-way solenoid valve A62 and simultaneously generates a discrete drive sequence for the three-way solenoid valve B72. And output to three-way solenoid valve B72), where the two sequences satisfy This delays the valve-controlled switching of metering branch B7 relative to metering branch A6, thereby creating reverse metering conditions. S3-3, Definition of Filling, Draining, and Holding States: Three-way solenoid valves A62 and B72 switch between filling, draining, and holding states under their respective driving sequences. The filling state corresponds to the metering chamber being connected to the water supply distribution manifold 5 to fill the metering chamber. The draining state corresponds to the metering chamber being connected to the water supply manifold 8 and outputting to the water supply manifold through the throttling device. The holding state corresponds to the metering chamber being disconnected from the water supply distribution manifold 5 and the water supply manifold 8 to maintain the stability of the pressure and volume in the metering chamber. S3-4, Merging and offsetting constraint: The distribution controller 17, through delayed driving and complementary switching, makes the instantaneous outputs of metering branch A6 and metering branch B7 at the water supply manifold 8 inversely correlated near the ripple main frequency, thereby reducing the water supply pulsation downstream of the water supply manifold 8 and reducing intermittent water mass injection. Conventional water supply typically employs a single metering chamber or a single pump for pulsed water supply, with downstream buffering or flow limiting smoothing out the pulsations. However, when ripple coupling self-excitation occurs, the single-channel structure is easily pulled by the ripple, forming an accumulation-sudden release of water droplets, increasing the risk of droplet carryover. Furthermore, the more the flow is limited, the more delayed the response becomes, and the more buffered it is, the more difficult it is to clean. This step allows metering branches A6 and B7 to operate with complementary rhythms in time, forming an inversely correlated output for the ripple component under a pilot phase shift. This allows the two branches to cancel out the same-frequency pulsation component at the water supply confluence point 8, while the low-frequency water supply demand is retained as a common baseline. By directly eliminating the pulsation source at the confluence point, the suppression of pulsation is moved forward to the water supply confluence, rather than relying on downstream passive filtration. Using cancellation as the hydraulic topology target, structural cancellation is achieved through dual-metering parallel connection and phase-shifted drive. This approach addresses water hammer and water droplet injection at the topological level, differing from the energy dissipation-based vibration suppression of conventional single-branch systems.

[0030] Step S4 includes the following steps S4-1 to S4-3: S4-1, Differential Pressure Measurement and Proportion Calculation: The distribution controller 17 reads the differential pressure corresponding to the differential pressure sampler 15 measured by differential pressure sensor 151 and records it as follows: The differential pressure measured by differential pressure sensor 161 and corresponding to the differential pressure of sampling element 16 is recorded as follows: and according to , Calculate the flow ratio between branch 1 (20) and branch 2 (21), where... Corresponding to branch 120, Corresponding to branch 21, and ; S4-2, Low-frequency total water supply target acquisition: The distribution controller 17 acquires the gas flow signal output by the ventilator and records it as follows: And denoted as the unit gas water demand coefficient corresponding to the set humidification target. Calculate the target total water supply at low frequency ,in The target humidity setpoint is obtained from a table and stored in the distribution controller 17. The above formula is used to map the actual air supply of the ventilator to the required water supply. S4-3, Branch Target and Metering Baseline Mapping: Distribution Controller 17 according to , Calculate the branch water supply targets for branch 20 and branch 21, and set the single-time metered discharge volume as... Afterwards, according to , Obtain the metering baseline frequency of the corresponding branch. , The metering baseline frequency is used to determine the low-frequency switching frequency and duty cycle of the three-way solenoid valve A62 and the three-way solenoid valve B72, so as to maintain the consistency of branch humidity supply when the flow changes. The above formula is used to convert the measured flow state into an executable metering valve control baseline. Conventional humidification systems typically address flow distribution issues with fixed settings or by only considering the total flow rate. Changes in the flow branches often result in transient imbalances, such as the main branch being sufficiently humid while the bypass is too dry, or vice versa. This is especially problematic when sampling bypasses, venting bypasses, or branches with different impedances exist; relying solely on the humidifier's own thermal and moisture inertia is insufficient for timely compensation. This step uses differential pressure sampling devices 15 / 16 and differential pressure sensors 151 / 161 to convert the flow distribution status into usable branch proportion information. The distribution controller 17 then adjusts the low-frequency baseline of the dual-metering water supply based on this information, ensuring the water supply strategy changes synchronously with the flow distribution status. This maintains consistent humidification capacity even when branch impedance or opening / closing changes. The vibration suppression of water supply and the consistency of shunt are coupled into the same control framework: at the high frequency level, water masses are suppressed by cancellation, and at the low frequency level, the humidification matching of the two branches is maintained by mirror distribution; the shunt state is introduced into the generation of water supply baseline, so that humidification water supply is no longer a single channel target, but a target system that is redistributed in real time according to the shunt topology, which solves the transient imbalance caused by shunt, an abnormality that is often overlooked but more difficult to locate clinically.

[0031] Step S5 includes the following steps S5-1 to S5-3: S5-1, Construction of Negative Pressure Peak Criterion: The distribution controller 17 calculates the minimum pressure value within each analysis window. And set the negative pressure peak threshold as ,in The pressure sequence is measured by the pneumatic pressure sensor 10. Used to characterize the intensity of negative pressure peaks within the analysis window; S5-2, Construction of Ripple Anomaly Amplification Criterion: The distribution controller 17 calculates the ripple amplitude index in each analysis window. And set the ripple amplitude threshold to The amplitude index is used to characterize the risk of fluid circuit coupling caused by ripple amplification; S5-3 Locking Execution and Resumption Conditions: When the following conditions are met Or meet When the distribution controller 17 controls the three-way solenoid valves A62 and B72 to enter the holding state and controls the pilot pressure relief valve 14 to open to release the pilot pressure directly reaching the pilot passage 12 and the phase shift pilot passage 13, it simultaneously controls the micro diaphragm pump 2 to stop pumping to block the continued water supply; when the continuous Each analysis window simultaneously satisfies and When this occurs, the distribution controller 17 closes the pilot relief valve 14 and re-executes phase shift tuning and anti-phase valve control drive to restore phase cancellation water supply.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "include," "contain," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0033] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A medical respiratory gas humidification and diversion device, characterized in that: include: The phase cancellation dual metering water supply component is used to structurally cancel the water supply pulsation component induced by the air pressure ripple in the water supply path at the water supply junction point, so as to output smooth low-frequency water supply. An adjustable hydraulic notch pilot assembly is used to convert pneumatic pressure ripple into a hydraulic pilot signal and generate a pilot signal with a set phase shift to drive the phase cancellation dual metering water supply assembly to form an inverted output. The mirrored diversion supply and distribution control component is used to obtain the flow ratio of the diversion branch and distribute the low-frequency water supply target to the corresponding branch according to the flow ratio, so as to reduce the transient humidity imbalance caused by diversion.

2. The medical respiratory gas humidification and diversion device according to claim 1, characterized in that: The phase cancellation dual metering water supply assembly includes a water source (1), a micro diaphragm pump (2), an inlet check valve (3), a filter (4), a water supply distribution manifold (5), a metering branch A (6), a metering branch B (7), a water supply manifold (8), and a humidification water supply interface (9); wherein, the outlet of the water source (1) is connected to the water supply distribution manifold (5) in sequence via the micro diaphragm pump (2), the inlet check valve (3), and the filter (4), the water supply distribution manifold (5) is connected to the metering branch A (6) and the metering branch B (7) respectively, the outlets of the metering branch A (6) and the metering branch B (7) are connected to the water supply manifold (8), the water supply manifold (8) is connected to the humidification water supply interface (9), and the humidification water supply interface (9) is connected to the water supply side of the humidification unit (18); Among them, the metering branch A (6) includes metering chamber A (61), three-way solenoid valve A (62), throttling device A (63) and micro accumulator A (64). The inlet end of the three-way solenoid valve A (62) is connected to the water supply distribution manifold (5). The outlet of the metering chamber A (61) is connected to the inlet end of the three-way solenoid valve A (62). The outlet end of the three-way solenoid valve A (62) is connected to the water supply manifold (8) through the throttling device A (63). The micro accumulator A (64) is connected between the metering chamber A (61) and the three-way solenoid valve A (62). Metering branch B (7) includes metering chamber B (71), three-way solenoid valve B (72), throttling device B (73) and micro accumulator B (74). The inlet end of the three-way solenoid valve B (72) is connected to the water supply distribution manifold (5). The outlet of metering chamber B (71) is connected to the inlet end of the three-way solenoid valve B (72). The outlet end of the three-way solenoid valve B (72) is connected to the water supply manifold (8) via throttling device B (73). Micro accumulator B (74) is connected between metering chamber B (71) and three-way solenoid valve B (72). The adjustable hydraulic notch wave pilot assembly includes a gas path pressure sensor (10), a diaphragm gas-liquid transducer (11), a direct pilot path (12), a phase-shift pilot path (13), and a pilot pressure relief valve (14). The gas path pressure sensor (10) is located on the gas outlet side of the humidification unit (18). The gas side of the diaphragm gas-liquid transducer (11) is connected to the gas path. The liquid side output of the diaphragm gas-liquid transducer (11) is connected to the direct pilot path (12) and the phase-shift pilot path (14). The inlet of the passage (13) is directly connected to the outlet of the pilot passage (12) and the pilot end of the three-way solenoid valve A (62). The phase-shift pilot passage (13) includes a delay chamber (131), a proportional throttle valve (132) and a damping throttle element (133) in sequence. The outlet of the phase-shift pilot passage (13) is connected to the pilot end of the three-way solenoid valve B (72). The pilot pressure relief valve (14) is connected between the common pilot node of the direct pilot passage (12) and the phase-shift pilot passage (13) and the return passage. The mirrored shunt supply and distribution control component includes a gas shunt (19), a shunt branch one (20), a shunt branch two (21), a differential pressure sampling device one (15), a differential pressure sampling device two (16), a differential pressure sensor one (151), a differential pressure sensor two (161), and a distribution controller (17); wherein, the gas outlet of the humidification unit (18) is connected to the gas shunt (19), the gas shunt (19) splits into shunt branch one (20) and shunt branch two (21), shunt branch one (20) is connected to the patient end interface (22), and the gas shunt is distributed. Branch 2 (21) is connected to bypass interface (23). Differential pressure sampling component 1 (15) is set on branch 1 (20) and connected to differential pressure sensor 1 (151). Differential pressure sampling component 2 (16) is set on branch 2 (21) and connected to differential pressure sensor 2 (161). The outputs of differential pressure sensor 1 (151) and differential pressure sensor 2 (161) are respectively input to distribution controller (17). Distribution controller (17) outputs control signals to three-way solenoid valve A (62), three-way solenoid valve B (72) and proportional throttle valve (132).

3. The medical respiratory gas humidification and diversion device according to claim 2, characterized in that: The operation of this device includes the following steps: S1. Ripple and flow rate acquisition: The gas pressure signal at the gas outlet side of the humidification unit (18) is acquired by the gas pressure sensor (10) and input into the distribution controller (17). The differential pressure signal corresponding to the differential pressure sampling element (15) is acquired by the differential pressure sensor (151) and input into the distribution controller (17). The differential pressure signal corresponding to the differential pressure sampling element (16) is acquired by the differential pressure sensor (161) and input into the distribution controller (17). The distribution controller (17) generates an analysis signal to characterize the pressure ripple based on the gas pressure signal. The distribution controller (17) generates the flow rate ratio information of the first branch (20) and the second branch (21) based on the differential pressure signal. S2, Pilot Phase Shift Tuning: The distribution controller (17) determines the phase shift target based on the main frequency characteristics of the pressure ripple and outputs a control signal to adjust the proportional throttle valve (132) in the phase shift pilot path (13), so that the phase shift pilot path (13) generates a pilot signal with a predetermined phase shift relative to the direct pilot path (12). The diaphragm gas-liquid transducer (11) converts the gas pressure ripple into a hydraulic pilot signal and sends it to the direct pilot path (12) and the phase shift pilot path (13) respectively. The direct pilot signal and the phase shift pilot signal are used to drive the three-way solenoid valve A (62) and the three-way solenoid valve B (72) respectively. S3, Dual metering reverse output and confluence cancellation: The distribution controller (17) controls the three-way solenoid valve A (62) and the three-way solenoid valve B (72) to switch according to complementary rhythm, so that the metering branch A (6) and the metering branch B (7) structurally cancel the water supply pulsation component induced by pressure ripple at the water supply confluence (8), and send the canceled water supply to the water supply side of the humidification unit (18) through the humidification water supply interface (9). The complementary rhythm includes the timing coordination of filling and draining of metering chamber A (61) and metering chamber B (71). The micro accumulator A (64) and micro accumulator B (74) are used to provide compliance during the metering switching process to reduce water hammer response. S4. Flow mirror allocation and low-frequency water supply baseline setting: The allocation controller (17) allocates the system's low-frequency water supply target to the corresponding branch water supply target according to the flow ratio of the first (20) and the second (21) of the flow branch, and sets the low-frequency metering baseline of the metering branch A (6) and the metering branch B (7) accordingly, so that the moisture supply capacity of the two flow branches remains consistent when the flow changes. The low-frequency metering baseline is achieved by the switching frequency and duty cycle of the three-way solenoid valve A (62) and the three-way solenoid valve B (72). The allocation result is updated in real time with the change of differential pressure signal and transitions through a smoothing strategy. S5. Abnormal Lockout and Recovery: The distribution controller (17) continuously monitors the negative pressure spike and abnormal ripple amplification in the gas pressure signal. When the lockout condition is met, it controls the three-way solenoid valve A (62) and the three-way solenoid valve B (72) to enter the holding state and controls the pilot pressure relief valve (14) to release the pilot pressure to block the abnormal water supply and reduce the risk of pollution backflow. After the abnormality is resolved, the distribution controller (17) re-executes the pilot phase shift tuning and dual metering reverse phase output according to the preset recovery sequence. During the recovery process, the continuity of water supply distribution and reverse phase timing is maintained to avoid secondary pulsation excitation.

4. The medical respiratory gas humidification and diversion device according to claim 3, characterized in that: Step S1 includes the following steps S1-1 to S1-3: S1-1, Sampling to obtain the pressure sequence: Distribute the controller (17) according to the sampling period Read the output of the gas pressure sensor (10) to obtain a discrete pressure sequence. ,in The sampling point number; S1-2, DC removal within the window: Set the analysis window length using the distribution controller (17). and set the number of samples within the window Calculate the in-window mean within each analysis window. ,in Used to characterize the DC component of pressure within the analysis window; S1-3, Constructing the ripple analysis sequence: Assigning controller (17) to construct the mean-reducing sequence It is used to characterize the pressure ripple component and as input for the main frequency estimation.

5. A medical respiratory gas humidification and diversion device according to claim 4, characterized in that: Step S2 includes the following steps S2-1 to S2-4: S2-1, Autocorrelation Calculation: The allocation controller (17) performs the calculation of the autocorrelation in each analysis window. Calculate the autocorrelation sequence ,in The delay order is... The characterization delay is The correlation strength at each sampling period, wherein the autocorrelation is used to extract the periodic characteristics of the pressure ripple; S2-2, Determining the main delay order: The allocation controller (17) determines the delay order within the preset range. Calculate one by one inside , take The delay order for achieving the maximum value is denoted as ,in The number of sampling points is an integer and is used to characterize the main period of the pressure ripple; S2-3, Ripple frequency calculation and phase shift target determination: Distributor controller (17) based on Calculate ripple frequency and according to Determine the target time constant for phase shift , The half-cycle delay used to make the phase-shifting leader path (13) form a relative direct leader path (12); S2-4, Phase Shift Pilot Path Tuning: The distribution controller (17) outputs a control signal to adjust the opening of the proportional throttle valve (132) to change the equivalent hydraulic resistance of the phase shift pilot path (13). And make the equivalent time constant of the phase-shift leader path (13) satisfy ,in The equivalent hydraulic compliance is formed by the elastic compliance of the delayed cavity (131) and the phase-shifting pilot path (13). The parameters are obtained from the system structure parameters and stored in the allocation controller (17).

6. A medical respiratory gas humidification and diversion device according to claim 5, characterized in that: Step S3 includes the following steps S3-1 to S3-4: S3-1, Determining the number of delay points: The allocation controller (17) determines the phase shift target time constant obtained previously. Calculate the number of discrete delay points ,in Take the integer value and use it to define the driving delay of metering branch B (7) relative to metering branch A (6); S3-2, Valve-controlled drive sequence generation: The distribution controller (17) generates the discrete drive sequence of the three-way solenoid valve A (62). The output is then sent to three-way solenoid valve A (62), while simultaneously generating a discrete drive sequence for three-way solenoid valve B (72). And output to three-way solenoid valve B (72), where the two sequences satisfy So that the valve control switching of metering branch B (7) is delayed relative to metering branch A (6); S3-3, Definition of filling, draining and holding states: Three-way solenoid valve A (62) and three-way solenoid valve B (72) switch between filling state, draining state and holding state under the action of their respective driving sequences; the filling state corresponds to the metering chamber being connected to the water supply distribution manifold (5) to fill the metering chamber with liquid, the draining state corresponds to the metering chamber being connected to the water supply manifold (8) and outputting to the water supply manifold through the throttling device, and the holding state corresponds to the metering chamber being disconnected from the water supply distribution manifold (5) and the water supply manifold (8) to maintain the pressure and volume stability in the metering chamber; S3-4, Merging and offsetting constraint: The distribution controller (17) makes the instantaneous outputs of metering branch A (6) and metering branch B (7) at the water supply manifold (8) inversely correlated near the ripple main frequency by means of the delay drive and complementary switching.

7. A medical respiratory gas humidification and diversion device according to claim 6, characterized in that: Step S4 includes the following steps S4-1 to S4-3: S4-1, Differential Pressure Measurement and Proportion Calculation: The distribution controller (17) reads the differential pressure measured by differential pressure sensor one (151) and records the corresponding differential pressure of the differential pressure sampler one (15). The differential pressure measured by differential pressure sensor two (161) and the corresponding differential pressure of sampling device two (16) are recorded as follows: and according to , Calculate the flow ratio between branch 1 (20) and branch 2 (21), where Corresponding to branch 1 (20). Corresponding to branch branch two (21), and ; S4-2, Low-frequency total water supply target acquisition: The distribution controller (17) acquires the gas flow signal output by the ventilator and records it as follows: And denoted as the unit gas water demand coefficient corresponding to the set humidification target. Calculate the target total water supply at low frequency ,in The target humidity setpoint is obtained by looking up a table and stored in the distribution controller (17); S4-3, Branch Target and Metering Baseline Mapping: Assignment Controller (17) based on , Calculate the branch water supply targets for branch 1 (20) and branch 2 (21), and set the single metered discharge volume as... Afterwards, according to , Obtain the metering baseline frequency of the corresponding branch. , The metering baseline frequency is used to determine the low-frequency switching frequency and duty cycle of the three-way solenoid valve A (62) and the three-way solenoid valve B (72) to maintain the consistency of branch humidity supply when the flow changes.

8. A medical respiratory gas humidification and diversion device according to claim 7, characterized in that: Step S5 includes the following steps S5-1 to S5-3: S5-1, Construction of negative pressure peak criterion: The distribution controller (17) calculates the minimum pressure value in each analysis window. And set the negative pressure peak threshold as ,in The pressure sequence is measured by the air pressure sensor (10). Used to characterize the intensity of negative pressure peaks within the analysis window; S5-2, Construction of Ripple Anomaly Amplification Criterion: The distribution controller (17) calculates the ripple amplitude index in each analysis window. And set the ripple amplitude threshold to The amplitude index is used to characterize the risk of fluid circuit coupling caused by ripple amplification; S5-3 Locking Execution and Resumption Conditions: When the following conditions are met Or meet When the distribution controller (17) controls the three-way solenoid valve A (62) and the three-way solenoid valve B (72) to enter the holding state and controls the pilot pressure relief valve (14) to open to release the pilot pressure directly reaching the pilot passage (12) and the phase shift pilot passage (13), while controlling the micro diaphragm pump (2) to stop pumping to block the continued water supply; when the continuous Each analysis window simultaneously satisfies and When the phase shift is reversed, the distribution controller (17) closes the pilot relief valve (14) and re-executes the phase shift tuning and the anti-phase valve control drive to restore the phase cancellation water supply.

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