A multi-protection system and method for a steam generating device in a steam ablation system

Abstract

The present application discloses a multiple protection system and method for a steam generating device in a steam ablation system, which relates to the technical field of equipment protection. The multiple protection system includes: a first temperature sensor, an air pressure sensor, a processor, a temperature limit switch, and a pressure limit valve. The processor is used to determine whether the first temperature is greater than a first temperature threshold. If so, the steam generator is controlled to stop absorbing water and heating. The processor is also used to determine whether the first air pressure is greater than the first air pressure threshold. If so, the steam generator is controlled to stop absorbing water and heating, and the exhaust valve and / or the drain valve are controlled to open. The temperature limit switch is used to open when the first temperature is greater than the second temperature threshold to cut off the power supply to the steam generator. The pressure limit valve is used to open when the second air pressure is greater than the second air pressure threshold to relieve the pressure of the steam generator. The present application can improve the safety and stability of a steam generating device operating under high temperature and high pressure conditions by designing software threshold protection and hardware threshold protection.

Description

Technical Field

[0001] The present application relates to the technical field of equipment protection, and in particular to a multiple protection system and method for a steam generating device in a steam ablation system. Background Art

[0002] In the field of lung cancer treatment, there are currently a variety of steam ablation systems for treating early lung cancer. The steam ablation system includes a steam generator and a steam release device. The steam generator is used to generate hot steam, and the steam release device is used to introduce hot steam into a suitable position of the airway of the lung segment to be treated. It can accurately eliminate lesions in a short time, while ensuring the effectiveness of ablation and reducing treatment damage.

[0003] As a medical device, the safety and stability of the steam ablation system are very important. It is different from medical equipment that operates under normal temperature and pressure conditions. It operates under high temperature and high pressure conditions. That is, in terms of operating conditions, the steam generator of the steam ablation system is in high temperature and high pressure conditions. The steam generator needs to be safely protected, which is also a problem that needs to be solved urgently. Summary of the invention

[0004] The purpose of the present application is to provide a multiple protection system and method for a steam generating device in a steam ablation system, which can improve the safety and stability of the steam generating device operating under high temperature and high pressure conditions.

[0005] To achieve the above objectives, this application provides the following solutions.

[0006] In a first aspect, the present application provides a multiple protection system for a steam generating device in a steam ablation system, wherein the steam generating device comprises a steam generator, a gas-liquid separator, a steam output pipe, an exhaust valve installed on the steam generator, and a drain valve installed on the gas-liquid separator, wherein the steam generator is used to heat water to obtain heated steam, an input end of the gas-liquid separator is connected to an output end of the steam generator, the gas-liquid separator is used to separate the heated steam to obtain condensed water and hot steam, an input end of the steam output pipe is connected to an output end of the gas-liquid separator, and the steam output pipe is used to output hot steam, and the multiple protection system for the steam generating device in the steam ablation system comprises:

[0007] A first temperature sensor is installed inside the steam generator and is used to collect a first temperature inside the steam generator;

[0008] A gas pressure sensor is installed on the connecting pipe between the steam generator and the gas-liquid separator, and is used to collect the first gas pressure of the heating steam output by the steam generator;

[0009] a processor, respectively connected to the first temperature sensor and the air pressure sensor for communication, for determining whether the first temperature is greater than a first temperature threshold, and if so, controlling the steam generator to stop absorbing water for heating, and for determining whether the first air pressure is greater than a first air pressure threshold, and if so, controlling the steam generator to stop absorbing water for heating, and controlling the exhaust valve and / or the drain valve to open;

[0010] a temperature limit switch, installed on the steam generator, for collecting a first temperature inside the steam generator and opening when the first temperature is greater than a second temperature threshold to cut off power to the steam generator; the second temperature threshold is greater than the first temperature threshold;

[0011] The pressure limiting valve is installed on the steam generator, used for collecting the second air pressure inside the steam generator, and opens when the second air pressure is greater than a second air pressure threshold to relieve the pressure of the steam generator; the second air pressure threshold is greater than the first air pressure threshold.

[0012] Optionally, the multiple protection system of the steam generating device in the steam ablation system further includes:

[0013] A second temperature sensor is installed at the output end of the steam output pipeline and is used to collect a second temperature of the hot steam output from the steam output pipeline;

[0014] The processor is in communication with the second temperature sensor and is used to control the operation of the steam generator based on the second temperature and the first air pressure so that the second temperature is maintained within a preset temperature range and the first air pressure is maintained at a target air pressure, and the target air pressure is within a preset air pressure range.

[0015] Optionally, the processor is further configured to determine whether the first temperature, the first air pressure or the second temperature is less than 0, and if so, to generate an alarm.

[0016] Optionally, the processor is also used to determine whether the second temperature is within a preset temperature range and whether the first air pressure is within a preset air pressure range when preparing to output hot steam. If not, the steam generator is controlled to operate based on the second temperature and the first air pressure.

[0017] Optionally, the multiple protection system of the steam generating device in the steam ablation system further includes:

[0018] The explosion-proof box accommodates the steam generator and is used to protect the steam generator; wherein the explosion-proof box comprises a metal mesh cover and a carbon fiber plate, and the carbon fiber plate is attached to the inner wall of the metal mesh cover.

[0019] Optionally, the multiple protection system of the steam generating device in the steam ablation system further includes:

[0020] A water collecting tank is installed below the steam generating device;

[0021] A liquid leakage sensor is installed inside the water collection tank and is used to detect whether there is water inside the water collection tank;

[0022] The processor is connected to the liquid leakage sensor for generating an alarm when the liquid leakage sensor detects water inside the water collection tank.

[0023] Optionally, the multiple protection system of the steam generating device in the steam ablation system further includes:

[0024] A liquid level detector is installed inside the gas-liquid separator;

[0025] The processor is connected to the liquid level detector for controlling the drain valve to open when the liquid level detector collects a liquid level signal.

[0026] Optionally, the steam generating device further includes an electromagnetic pump, the output end of the electromagnetic pump is connected to the input end of the steam generator, the electromagnetic pump is used to provide water to the steam generator, and a solenoid valve is installed on the steam output pipeline. The multiple protection system of the steam generating device in the steam ablation system also includes:

[0027] The shielding box accommodates the electromagnetic pump and the electromagnetic valve respectively and is used for shielding and protecting the electromagnetic pump and the electromagnetic valve;

[0028] Shielded wire, used to connect the electromagnetic pump with external devices, and to connect the electromagnetic valve with external devices.

[0029] In a second aspect, the present application provides a multiple protection method for a steam generating device in a steam ablation system, which is applied to any one of the multiple protection systems for a steam generating device in a steam ablation system described above, and the multiple protection method for a steam generating device in a steam ablation system comprises:

[0030] Acquire a first temperature collected by a first temperature sensor and a first air pressure collected by an air pressure sensor;

[0031] Determine whether the first temperature is greater than a first temperature threshold, and if so, control the steam generator to stop absorbing water for heating;

[0032] It is determined whether the first air pressure is greater than a first air pressure threshold value. If so, the steam generator is controlled to stop absorbing water for heating, and the exhaust valve and / or the drain valve are controlled to open.

[0033] Optionally, the multiple protection method for the steam generating device in the steam ablation system further includes:

[0034] Acquire a second temperature collected by a second temperature sensor and a first air pressure collected by an air pressure sensor;

[0035] Determine whether the second temperature is less than a lower limit of a preset temperature range, and obtain a first determination result;

[0036] If the first judgment result is yes, the steam generator is controlled to start absorbing water for heating;

[0037] If the first judgment result is no, then judging whether the second temperature is greater than the upper limit of the preset temperature range, and obtaining a second judgment result;

[0038] If the second judgment result is yes, the steam generator is controlled to stop absorbing water for heating;

[0039] If the second judgment result is no, the first air pressure is used as input, and PID control is used to determine the heating power control amount of the steam generator, and the steam generator is controlled according to the heating power control amount, so that the second temperature is maintained within the preset temperature range, and the first air pressure is maintained at the target air pressure, and the target air pressure is within the preset air pressure range.

[0040] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0041] The present application provides a multiple protection system and method for a steam generating device in a steam ablation system, the multiple protection system comprising: a first temperature sensor for collecting a first temperature inside a steam generator, a pressure sensor for collecting a first pressure of heating steam output by the steam generator, a processor for determining whether the first temperature is greater than a first temperature threshold, and if so, controlling the steam generator to stop absorbing water for heating, and also for determining whether the first pressure is greater than a first pressure threshold, and if so, controlling the steam generator to stop absorbing water for heating, and controlling the exhaust valve and / or the drain valve to open, thereby ensuring that the temperature and pressure do not exceed the limit through software threshold protection; a temperature limiting switch for collecting the first temperature inside the steam generator, and opening when the first temperature is greater than a second temperature threshold to cut off the power to the steam generator, a pressure limiting valve for collecting the second pressure inside the steam generator, and opening when the second pressure is greater than the second pressure threshold to depressurize the steam generator, thereby ensuring that the temperature and pressure do not exceed the limit through hardware threshold protection. By designing software threshold protection and hardware threshold protection, the present application can ensure that the temperature and air pressure do not exceed the limit from two aspects, thereby improving the safety and stability of the steam generating device operating under high temperature and high pressure conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 This is a schematic structural diagram of a multiple protection system for a steam generating device in a steam ablation system provided in Example 1 of the present application.

[0044] Reference numerals:

[0045] 1-steam generator; 2-gas-liquid separator; 3-second temperature sensor; 4-air pressure sensor; 5-drain valve; 6-pressure limiting valve; 7-explosion-proof box; 8-water collection tank; 9-liquid level detector; 10-electromagnetic pump; 11-first solenoid valve; 12-second solenoid valve. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] Example 1.

[0048] like Figure 1 As shown, in order to protect the steam generating device and improve the safety and stability of the steam generating device, the present embodiment is designed with software and hardware limit thresholds to achieve software and hardware threshold protection of temperature and air pressure.

[0049] Software threshold protection specifically includes the following contents.

[0050] The software threshold protection of this embodiment introduces a first temperature sensor installed inside the steam generator 1 to collect the first temperature inside the steam generator 1, and sets a first temperature threshold lower than the second temperature threshold in the hardware threshold protection. Normal working conditions will not involve a temperature higher than the first temperature threshold, then the first temperature threshold is greater than the upper limit of the preset temperature range, and the first temperature threshold can be 130°C. When the first temperature exceeds the first temperature threshold, the steam generator 1 stops absorbing water for heating. A pressure sensor 4 is connected to the steam gas path to collect the first air pressure of the heating steam output by the steam generator 1, and a first air pressure threshold lower than the second air pressure threshold in the hardware threshold protection is set. Normal working conditions will not involve an air pressure higher than the first air pressure threshold, then the first air pressure threshold is greater than the upper limit of the preset air pressure range, and the first air pressure threshold can be 2.5 bar. When the first air pressure exceeds the first air pressure threshold, the steam generator 1 stops absorbing water for heating, and opens the drain valve 5 to drain water, and / or opens the exhaust valve to release pressure, that is, only the drain valve 5 can be opened to drain water, or only the exhaust valve can be opened to release pressure, or the drain valve 5 can be opened to drain water and the exhaust valve can be opened to release pressure at the same time.

[0051] Hardware threshold protection specifically includes the following contents.

[0052] The hardware threshold protection of this embodiment adds a temperature limit switch for high-temperature tripping to the steam generator 1. When the first temperature inside the steam generator 1 exceeds the second temperature threshold, the temperature limit switch will be disconnected. The temperature limit switch is installed on the connection line between the external power supply and the steam generator 1. At this time, the steam generator 1 will be powered off and no longer heated. The second temperature threshold is greater than the first temperature threshold, but less than the rated tolerance of the steam generator. The second temperature threshold can be 195°C, and the rated tolerance can be 300-400°C. A pressure limiting valve 6 is added to the steam generator 1. When the second air pressure inside the steam generator 1 exceeds the second air pressure threshold, the pressure limiting valve 6 will open and release gas to reduce the pressure. The second air pressure threshold is greater than the first air pressure threshold, but less than the rated tolerance of the steam generator. The second air pressure threshold can be 7bar, and the rated tolerance can be 10bar. Hardware threshold protection is another layer of bottom-line protection when the software threshold protection fails, thereby further improving the safety and stability of the steam generator.

[0053] like Figure 1 As shown, this embodiment provides a multiple protection system for a steam generating device in a steam ablation system, the steam generating device comprising a steam generator 1, a gas-liquid separator 2, a steam output pipe, an exhaust valve installed on the steam generator 1 and a drain valve 5 installed on the gas-liquid separator 2, the steam generator 1 is used to heat water to obtain heating steam, the input end of the gas-liquid separator 2 is connected to the output end of the steam generator 1, the gas-liquid separator 2 is used to separate the heating steam to obtain condensed water and hot steam, the input end of the steam output pipe is connected to the output end of the gas-liquid separator 2, the steam output pipe is used to output hot steam, and the multiple protection system for the steam generating device in the steam ablation system comprises the following components.

[0054] The first temperature sensor is installed inside the steam generator 1 and is used to collect a first temperature inside the steam generator 1 .

[0055] The air pressure sensor 4 is installed on the connecting pipe between the steam generator 1 and the gas-liquid separator 2 , and is used to collect the first air pressure of the heating steam output by the steam generator 1 .

[0056] The processor is respectively connected to the first temperature sensor and the air pressure sensor 4 for communication, and is used to determine whether the first temperature is greater than the first temperature threshold. If so, the steam generator 1 is controlled to stop absorbing water and heating. The processor is also used to determine whether the first air pressure is greater than the first air pressure threshold. If so, the steam generator 1 is controlled to stop absorbing water and heating, and the exhaust valve and / or drain valve 5 are controlled to open.

[0057] The temperature limit switch is installed on the steam generator 1, and is used to collect a first temperature inside the steam generator 1, and is opened when the first temperature is greater than a second temperature threshold to cut off power to the steam generator 1; the second temperature threshold is greater than the first temperature threshold.

[0058] The pressure limiting valve 6 is installed on the steam generator 1, and is used to collect the second air pressure inside the steam generator 1, and open when the second air pressure is greater than a second air pressure threshold to relieve the pressure of the steam generator 1; the second air pressure threshold is greater than the first air pressure threshold.

[0059] In this embodiment, the processor is also used to pop up a corresponding prompt box to prompt the cause of the alarm when the first temperature is greater than the first temperature threshold, and is also used to pop up a corresponding prompt box to prompt the cause of the alarm when the first air pressure is greater than the first air pressure threshold. For example, when the first air pressure detected by the air pressure sensor 4 is greater than the first air pressure threshold, a pressure alarm prompt box pops up.

[0060] The multi-protection system of the steam generating device in the steam ablation system of this embodiment also includes the following components.

[0061] The second temperature sensor 3 is installed at the output end of the steam output pipeline, so the second temperature sensor 3 can also be called an output port temperature sensor, which is used to collect the second temperature of the hot steam output from the steam output pipeline.

[0062] The processor is in communication with the second temperature sensor 3 and is used to control the operation of the steam generator 1 based on the second temperature and the first air pressure, so that the second temperature is maintained within a preset temperature range and the first air pressure is maintained at a target air pressure, and the target air pressure is within a preset air pressure range.

[0063] The steam generating device operates under high temperature and high pressure conditions. In order to improve the safety and stability of the steam generating device under high temperature and high pressure conditions, the present embodiment is designed to dynamically maintain the temperature and pressure of the steam generating device under normal conditions. The normal conditions can be characterized by a preset temperature range and a target pressure. The preset temperature range can be 100-105°C. The target pressure is within the preset pressure range. The preset pressure range can be 1.0-1.5bar. At this time, the target pressure can be 1.1bar. When the steam generating device is maintained within the preset temperature range and target pressure, there is a certain safety distance from the software and hardware limit threshold and the rated bearing value of the steam generating device. The steam generating device is more stable and safe, and will not trigger an alarm.

[0064] Normal operating condition maintenance is mainly divided into the state switching logic of dynamically maintaining temperature and proportional-integral-derivative control (PID) of dynamically maintaining target air pressure. First, when the second temperature is less than 100°C, steam generator 1 starts to absorb water for heating, and when the second temperature is greater than 105°C, steam generator 1 stops absorbing water for heating. After the second temperature is within the preset temperature range, the dynamic adjustment of air pressure based on proportional-integral-derivative control is turned on. The PID control of air pressure is based on the millisecond-level real-time data feedback of the air pressure sensor 4. Specifically, the heating power (0-100%) of the steam generator 1 and the water absorption rate that matches it in equal proportion are dynamically adjusted based on the time series data feedback of the first air pressure, that is, the water absorption rate control amount is the same as the heating power control amount. If the heating power control amount is 50%, the water absorption rate control amount is also 50%, so that the air pressure is dynamically stabilized at the target air pressure.

[0065] Current time in PID control of air pressure Corresponding heating power control amount The calculation formula is as follows:

[0066] ;

[0067] ;

[0068] In the above formula, For the current moment The heating power control amount; is a proportional term; is the constant coefficient of the proportional term; For the current moment The error represents the difference between the target air pressure and the first air pressure measured in real time by the air pressure sensor 4, that is, the target air pressure and the current time. The difference of the first air pressure; is the integral term, Represents the initial moment from when the PID control of air pressure is turned on Until now The accumulated value of a series of errors; is the constant coefficient of the integral term; The initial moment to start the PID control of air pressure; For the moment The error of is the differential term, calculate the current moment of With the previous moment of The difference reflects the rate of change of air pressure; is the constant coefficient of the differential term; For the previous moment The error of is the target air pressure, such as setting it to 1.1 bar; For the current moment The first air pressure.

[0069] The heating power of the steam generator 1 is iteratively controlled according to the above formula, and the air pressure of the steam generating device will eventually stabilize at the target air pressure. The above PID control of air pressure is a specific application of a general automatic control method. When applied to the dynamic control of air pressure of a steam generating device, dynamic stability can be achieved when the cumulative background noise interference such as the heat dissipation rate of the equipment and air leakage changes below the second order.

[0070] The specific implementation method of dynamically maintaining the temperature and air pressure of the steam generating device under normal operating conditions, that is, the processor controls the operation of the steam generator 1 based on the second temperature and the first air pressure, so that the second temperature is maintained within a preset temperature range and the first air pressure is maintained at the target air pressure, includes the following steps.

[0071] (1) Determine whether the second temperature is less than a lower limit of a preset temperature range to obtain a first determination result.

[0072] (2) If the first judgment result is yes, the steam generator 1 is controlled to start absorbing water for heating.

[0073] (3) If the first judgment result is no, determine whether the second temperature is greater than the upper limit of the preset temperature range to obtain a second judgment result.

[0074] (4) If the second judgment result is yes, the steam generator 1 is controlled to stop absorbing water for heating.

[0075] (5) If the second judgment result is no, the first gas pressure is used as input, and the heating power control amount of the steam generator 1 is determined by PID control, and the steam generator 1 is controlled to operate according to the heating power control amount, so that the second temperature is maintained within the preset temperature range and the first gas pressure is maintained at the target gas pressure.

[0076] Since there may be a time difference between the generation of hot steam and the release of the hot steam by the user, the temperature and pressure of the generated hot steam will change. In order to further protect the steam generating device and improve the safety and stability of the steam generating device, the present embodiment is also designed with conditions allowing the release of hot steam: when the steam generating device completes steam preparation, it will check whether the current second temperature and first air pressure are within a certain range. Only if they are within a certain range will they be output according to the set specified dosage. At this time, the certain range includes a preset temperature range corresponding to the second temperature and a preset pressure range corresponding to the first air pressure. When hot steam is ready and both the second temperature and the first air pressure meet the conditions (i.e. the second temperature is within the preset temperature range, and the first air pressure is within the preset air pressure range), a single prompt sound will be emitted, indicating that the current conditions are suitable for releasing hot steam, and the user can press the button to release it; when hot steam is ready but either the second temperature or the first air pressure does not meet the conditions, two rapid prompt sounds will be emitted, indicating that the current conditions are not suitable for releasing hot steam, and the device will automatically enter the adjustment working state, and make adjustments according to the specific implementation method of dynamically maintaining the temperature and air pressure of the above-mentioned steam generating device at the normal working condition, so as to ensure that the temperature, air pressure and dosage of the output hot steam are in line with expectations.

[0077] In this embodiment, the processor is also used to determine whether the second temperature is within the preset temperature range and whether the first air pressure is within the preset air pressure range when preparing to output steam. If not, the steam generator 1 is controlled to operate based on the second temperature and the first air pressure.

[0078] In order to further protect the steam generating device and improve the safety and stability of the steam generating device, this embodiment is designed with an abnormal value alarm, which specifically includes the following contents.

[0079] When the second temperature sensor 3 and the first temperature sensor show values ​​less than 0°C, it indicates that the temperature is too low and an alarm is issued. This is because negative temperatures will not occur under normal operating conditions. Negative temperatures may be caused by abnormal sensor values, functional damage, or environmental conditions that are not suitable for the use of the steam ablation system, such as the risk of ice blocking the pipeline.

[0080] When the air pressure sensor 4 shows a value less than 0 bar, it indicates that the air pressure is too low and an alarm is issued. This is because negative pressure will not appear under normal working conditions. The occurrence of negative pressure may be due to abnormal sensor value, functional damage or environmental conditions that are not suitable for the use of the steam ablation system. This is similar to the fact that negative pressure ventilation is generally not used in the field of ventilators, which can easily cause ventilation damage.

[0081] In this embodiment, the processor is further configured to determine whether the first temperature, the first air pressure or the second temperature is less than 0, and if so, to generate an alarm.

[0082] In order to further protect the steam generating device and improve the safety and stability of the steam generating device, the present embodiment is designed with an explosion-proof box 7, and a double explosion-proof layer of a carbon fiber plate and a sheet metal mesh cover is installed outside the steam generator 1. The carbon fiber plate can further enhance the strength of the explosion-proof box 7 to reduce the impact on external devices when the steam generator 1 leaks and is damaged accidentally.

[0083] In this embodiment, the multi-protection system of the steam generating device in the steam ablation system also includes the following components.

[0084] The explosion-proof box 7 accommodates the steam generator 1 and is used to protect the steam generator 1. The explosion-proof box 7 includes a metal mesh cover and a carbon fiber plate, the carbon fiber plate is attached to the inner wall of the metal mesh cover, and the metal mesh cover can be a sheet metal metal mesh cover.

[0085] In order to further protect the steam generating device and improve the safety and stability of the steam generating device, the present embodiment is designed with gas path airtight leakage protection: a water collecting tank 8 is installed at the bottom of the steam generating device, and a liquid leakage sensor is placed in the water collecting tank 8. The liquid leakage sensor may also be called a liquid detection sensor. When the gas path leaks, there will be water in the water collecting tank 8 at the bottom of the steam generating device, and the water will soak the liquid leakage sensor in the water collecting tank 8. At this time, the liquid leakage sensor detects water and issues an alarm.

[0086] In this embodiment, the multi-protection system of the steam generating device in the steam ablation system also includes the following components.

[0087] The water collecting tank 8 is installed below the steam generating device.

[0088] The liquid leakage sensor is installed inside the water collection tank 8 and is used to detect whether there is water inside the water collection tank 8.

[0089] The processor is connected to the liquid leakage sensor for generating an alarm when the liquid leakage sensor detects water inside the water collection tank 8 .

[0090] In order to further protect the steam generating device and improve the safety and stability of the steam generating device, the present embodiment is designed with a drainage prompt: a liquid level detector 9 is installed under the gas-liquid separator 2. When too much water is absorbed or there is a lot of condensed water in the gas pipeline, the liquid level of the condensed water in the gas-liquid separator 2 will reach the installation position of the liquid level detector 9. At this time, the liquid level signal emitted by the liquid level detector 9 will be detected, and the drain valve 5 under the gas-liquid separator 2 will be opened for drainage.

[0091] In this embodiment, the multi-protection system of the steam generating device in the steam ablation system also includes the following components.

[0092] The liquid level detector 9 is installed inside the gas-liquid separator 2 .

[0093] The processor is in communication connection with the liquid level detector 9 and is used to control the drain valve 5 to open when the liquid level detector 9 collects the liquid level signal.

[0094] In this embodiment, the steam generating device also includes an electromagnetic pump 10, the output end of the electromagnetic pump 10 is connected to the input end of the steam generator 1, the electromagnetic pump 10 is used to provide water to the steam generator 1, and a solenoid valve is installed on the steam output pipe. The multiple protection system of the steam generating device in the steam ablation system also includes the following components.

[0095] The shielding box accommodates the electromagnetic pump 10 and the electromagnetic valve respectively, and is used to shield and protect the electromagnetic pump 10 and the electromagnetic valve. The shielding box can be made of shielding and protective materials, such as aluminum foil, etc., and the shielding box is installed outside the electromagnetic pump 10 and the electromagnetic valve respectively.

[0096] The shielded wire is used to connect the electromagnetic pump 10 with external devices and the electromagnetic valve with external devices. The shielded wire can be a high temperature resistant shielded wire, and the shielded wire passes through the shielding box.

[0097] The steam output pipeline of this embodiment includes two branches, which are respectively denoted as the first branch and the second branch. The first branch is a user steam release branch. A first solenoid valve 11 is installed on the first branch. The first solenoid valve 11 can also be called a user steam release solenoid valve. The second branch is a preheating steam release branch. A second solenoid valve 12 is installed on the second branch. The second solenoid valve 12 can also be called a preheating steam release solenoid valve. When a large flow of steam output is required, the two branches can be opened at the same time. Otherwise, only one branch can be opened. At this time, the solenoid valves include the first solenoid valve 11 and the second solenoid valve 12.

[0098] This embodiment provides a multiple protection system for a steam generator in a steam ablation system. The steam ablation system can be used to treat small nodule lung cancer, can achieve multiple protections for steam generators operating under high temperature and high pressure conditions, can improve the safety and stability of steam generators, and has been verified to be effective. After normal startup and operation, it can automatically and dynamically maintain a preset temperature range and a preset air pressure range within a minute. The normal operating range and the thresholds at the software and hardware levels have a certain margin difference, and no alarm will be triggered. Multiple protections also include pressure and temperature limit protection, explosion-proof protection, and liquid leakage protection at the hardware and software levels. On the one hand, the protection at the software level can issue an alarm in advance when the device is abnormal or the device is aging. On the other hand, the protection at the hardware level also ensures that the operating conditions of the steam generator will not exceed the rated temperature and air pressure of the device, reducing safety hazards. In addition, shielding protection adjustments are added to the solenoid valve, solenoid pump 10 and other devices from the electromagnetic compatibility and electrical safety levels, and high-temperature resistant shielded wires are used uniformly to meet the national standard electromagnetic compatibility requirements and electrical safety requirements and pass third-party testing. Furthermore, through actual measurement and testing, it has been confirmed that the application of the multiple protection system provided in this embodiment enables the steam generating device to operate normally and be safe and stable. When the steam generating device is abnormal, an alarm will be sounded and corresponding problems will be prompted, thus avoiding safety accidents in advance and facilitating the location of the abnormal cause, thereby facilitating maintenance.

[0099] At present, the steam generating device using multiple protection systems has passed the third-party electrical safety test and electromagnetic compatibility test and complies with the corresponding national standards. The corresponding test items and standards are shown in Table 1 below.

[0100] Table 1 Test items and standards

[0101]

[0102] Example 2.

[0103] This embodiment provides a multiple protection method for a steam generating device in a steam ablation system, which is applied to the multiple protection system for a steam generating device in a steam ablation system described in Embodiment 1. The multiple protection method for a steam generating device in a steam ablation system includes the following steps.

[0104] (1) Obtaining a first temperature collected by a first temperature sensor and a first air pressure collected by an air pressure sensor.

[0105] (2) determining whether the first temperature is greater than a first temperature threshold; if so, controlling the steam generator to stop absorbing water for heating.

[0106] (3) Determine whether the first air pressure is greater than a first air pressure threshold value. If so, control the steam generator to stop absorbing water for heating, and control the exhaust valve and / or the drain valve to open.

[0107] The multiple protection method for the steam generating device in the steam ablation system of this embodiment also includes the following steps.

[0108] (1) Obtaining a second temperature collected by a second temperature sensor and a first air pressure collected by an air pressure sensor.

[0109] (2) Determine whether the second temperature is less than a lower limit of a preset temperature range, and obtain a first determination result.

[0110] (3) If the first judgment result is yes, the steam generator is controlled to start absorbing water for heating.

[0111] (4) If the first judgment result is no, determine whether the second temperature is greater than the upper limit of the preset temperature range to obtain a second judgment result.

[0112] (5) If the second judgment result is yes, the steam generator is controlled to stop absorbing water for heating.

[0113] (6) If the second judgment result is no, the first air pressure is used as input, and the heating power control amount of the steam generator is determined by PID control, and the steam generator is controlled according to the heating power control amount, so that the second temperature is maintained within the preset temperature range, and the first air pressure is maintained at the target air pressure, and the target air pressure is within the preset air pressure range.

[0114] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0115] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A multiple protection system for a steam generating device in a steam ablation system, the steam generating device comprising a steam generator, a gas-liquid separator, a steam output pipeline, an exhaust valve installed on the steam generator and a drain valve installed on the gas-liquid separator, the steam generator is used to heat water to obtain heating steam, the input end of the gas-liquid separator is connected to the output end of the steam generator, the gas-liquid separator is used to separate the heating steam to obtain condensed water and hot steam, the input end of the steam output pipeline is connected to the output end of the gas-liquid separator, and the steam output pipeline is used to output hot steam, It is characterized in that The multiple protection system of the steam generating device in the steam ablation system includes: A first temperature sensor is installed inside the steam generator and is used to collect a first temperature inside the steam generator; A gas pressure sensor is installed on the connecting pipe between the steam generator and the gas-liquid separator, and is used to collect the first gas pressure of the heating steam output by the steam generator; a processor, respectively connected to the first temperature sensor and the air pressure sensor for communication, for determining whether the first temperature is greater than a first temperature threshold, and if so, controlling the steam generator to stop absorbing water for heating, and for determining whether the first air pressure is greater than a first air pressure threshold, and if so, controlling the steam generator to stop absorbing water for heating, and controlling the exhaust valve and / or the drain valve to open; a temperature limit switch, installed on the steam generator, for collecting a first temperature inside the steam generator and opening when the first temperature is greater than a second temperature threshold to cut off power to the steam generator; the second temperature threshold is greater than the first temperature threshold; A pressure limiting valve is installed on the steam generator, and is used to collect a second air pressure inside the steam generator, and is opened when the second air pressure is greater than a second air pressure threshold value, so as to relieve the pressure of the steam generator; the second air pressure threshold value is greater than the first air pressure threshold value; The multiple protection system of the steam generating device in the steam ablation system also includes: A second temperature sensor is installed at the output end of the steam output pipeline and is used to collect a second temperature of the hot steam output from the steam output pipeline; The processor is in communication with the second temperature sensor and is used to control the steam generator to operate based on the second temperature and the first air pressure, so that the second temperature is maintained within a preset temperature range and the first air pressure is maintained at a target air pressure, and the target air pressure is within a preset air pressure range, specifically including: Determine whether the second temperature is less than a lower limit of a preset temperature range, and obtain a first determination result; If the first judgment result is yes, the steam generator is controlled to start absorbing water for heating; If the first judgment result is no, then judging whether the second temperature is greater than the upper limit of the preset temperature range, and obtaining a second judgment result; If the second judgment result is yes, the steam generator is controlled to stop absorbing water for heating; If the second judgment result is no, the first air pressure is used as input, and PID control is used to determine the heating power control amount of the steam generator, and the steam generator is controlled according to the heating power control amount, so that the second temperature is maintained within the preset temperature range, and the first air pressure is maintained at the target air pressure, and the target air pressure is within the preset air pressure range.

2. The multi-protection system for the steam generating device in the steam ablation system according to claim 1, It is characterized in that The processor is also used to determine whether the first temperature, the first air pressure or the second temperature is less than 0, and if so, to issue an alarm.

3. The multi-protection system for the steam generating device in the steam ablation system according to claim 1, It is characterized in that The processor is also used to determine whether the second temperature is within a preset temperature range and whether the first air pressure is within a preset air pressure range when preparing to output hot steam. If not, the steam generator is controlled to operate based on the second temperature and the first air pressure.

4. The multi-protection system for the steam generating device in the steam ablation system according to claim 1, It is characterized in that The multiple protection system of the steam generating device in the steam ablation system also includes: The explosion-proof box accommodates the steam generator and is used to protect the steam generator; wherein the explosion-proof box comprises a metal mesh cover and a carbon fiber plate, and the carbon fiber plate is attached to the inner wall of the metal mesh cover.

5. The multi-protection system for the steam generating device in the steam ablation system according to claim 1, It is characterized in that The multiple protection system of the steam generating device in the steam ablation system also includes: A water collecting tank is installed below the steam generating device; A liquid leakage sensor is installed inside the water collection tank and is used to detect whether there is water inside the water collection tank; The processor is connected to the liquid leakage sensor for generating an alarm when the liquid leakage sensor detects water inside the water collection tank.

6. The multi-protection system for the steam generating device in the steam ablation system according to claim 1, It is characterized in that The multiple protection system of the steam generating device in the steam ablation system also includes: A liquid level detector is installed inside the gas-liquid separator; The processor is connected to the liquid level detector for controlling the drain valve to open when the liquid level detector collects a liquid level signal.

7. The multi-protection system for the steam generating device in the steam ablation system according to claim 1, wherein the steam generating device further comprises an electromagnetic pump, the output end of the electromagnetic pump is connected to the input end of the steam generator, the electromagnetic pump is used to provide water to the steam generator, and a solenoid valve is installed on the steam output pipeline. It is characterized in that The multiple protection system of the steam generating device in the steam ablation system also includes: The shielding box accommodates the electromagnetic pump and the electromagnetic valve respectively and is used for shielding and protecting the electromagnetic pump and the electromagnetic valve; Shielded wire, used to connect the electromagnetic pump with external devices, and to connect the electromagnetic valve with external devices.

8. A multiple protection method for a steam generating device in a steam ablation system, applied to a multiple protection system for a steam generating device in a steam ablation system according to any one of claims 1 to 7, It is characterized in that The multiple protection method for the steam generating device in the steam ablation system includes: Acquire a first temperature collected by a first temperature sensor and a first air pressure collected by an air pressure sensor; Determine whether the first temperature is greater than a first temperature threshold, and if so, control the steam generator to stop absorbing water for heating; Determine whether the first air pressure is greater than a first air pressure threshold, and if so, control the steam generator to stop absorbing water for heating, and control the exhaust valve and / or the drain valve to open; The multiple protection method for the steam generating device in the steam ablation system also includes: Acquire a second temperature collected by a second temperature sensor and a first air pressure collected by an air pressure sensor; Determine whether the second temperature is less than a lower limit of a preset temperature range, and obtain a first determination result; If the first judgment result is yes, the steam generator is controlled to start absorbing water for heating; If the first judgment result is no, then judging whether the second temperature is greater than the upper limit of the preset temperature range, and obtaining a second judgment result; If the second judgment result is yes, the steam generator is controlled to stop absorbing water for heating; If the second judgment result is no, the first air pressure is used as input, and PID control is used to determine the heating power control amount of the steam generator, and the steam generator is controlled according to the heating power control amount, so that the second temperature is maintained within the preset temperature range, and the first air pressure is maintained at the target air pressure, and the target air pressure is within the preset air pressure range.

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