Gas turbine combustion chamber test bed pressure scanning valve pretreatment cabinet with water removal function and control method of gas turbine combustion chamber test bed pressure scanning valve pretreatment cabinet

Abstract

The invention discloses a gas turbine combustion chamber test bed pressure scanning valve pretreatment cabinet with a water removal function and a control method thereof, and belongs to the technical field of gas turbine test equipment.The pretreatment cabinet comprises a cabinet body, an air inlet connector, a three-way reversing electromagnetic valve, a heater, a water collector, a heat tracing pipe and other components; one end of the air inlet connector is connected with a gas turbine combustion chamber pressure guide pipe, the other end of the air inlet connector is guided into the cabinet body, a stainless steel pipe, a three-way reversing electromagnetic valve, a heater and a water collector are arranged in the cabinet body, the universal wheels are installed below the cabinet body, and a stainless steel pipe, a heat tracing belt, a ceramic fiber layer and a fluororubber protection layer are arranged in the heat tracing pipe. According to the pretreatment cabinet, liquid water in front of a pressure scanning valve is completely discharged before a gas turbine combustion chamber test, gas is kept dry through high temperature during the test, the use process is simple, and the accuracy of test data during the combustion chamber test is ensured while the pressure scanning valve is protected.

Description

Technical Field

[0001] This invention belongs to the technical field of gas turbine testing equipment, and relates to the water removal pretreatment technology of the pressure scanning valve of a gas turbine combustion chamber test bench. Specifically, it is a pretreatment cabinet for the pressure scanning valve of a gas turbine combustion chamber test bench with water removal function and its control method, which is used to efficiently remove liquid water in the pressure tapping pipe and realize continuous heating and dehumidification during the test, improve the accuracy of pressure measurement and ensure the safe operation of the scanning valve. Background Technology

[0002] Combustion chamber testing is a crucial step in the research, development, optimization, operation, and maintenance of gas turbines. Its core objective is to ensure the performance, safety, reliability, and environmental friendliness of the combustor under complex operating conditions. During combustion chamber testing, to comprehensively evaluate the combustor's performance, flow characteristics, and safety, it is necessary to measure the inlet total pressure, outlet total pressure, annular cavity total pressure, and annular cavity static pressure. These pressures are drawn from pressure taps at the inlet transition section, casing, and measurement section to a pressure scanning valve. The pressure scanning valve measures pressure changes in real time, reflecting the combustor's operating conditions and combustion variations.

[0003] However, in actual combustion chamber tests, due to factors such as liquid water remaining in the intake pipe, incomplete evaporation of moisture during simulated humidification tests, and water separation after air compression and temperature drop, this liquid water often enters the pressure tapping pipe, altering the pressure transmission characteristics and affecting measurement accuracy. It can even enter the pressure scanning valve, causing short circuits and corrosion, leading to equipment malfunctions.

[0004] Currently, some preliminary solutions exist for the problem of liquid water inside pressure tapping pipes. For example, filters or dryers are installed in the pressure tapping lines to remove moisture from the air. However, these methods often only remove some moisture and cannot completely eliminate the influence of liquid water. In addition, some test benches use a method of periodically purging the pressure tapping lines to remove accumulated water inside the pipes. However, this method is cumbersome and cannot guarantee continuous moisture removal during the test. For example, Chinese patent CN222825187U discloses a water removal device for pressure measuring pipes and their connecting hoses. This device uses an air pump to blow air into the pressure measuring pipe to blow out residual liquid. However, this solution is mainly for a single pressure measuring pipe in hydraulic experiments and is difficult to apply to the complex conditions of multiple pressure tapping pipes connected in parallel in gas turbine combustion chamber tests. CN202031817U discloses an automatic drainage device for the pressure tapping pipe of a compressor, which uses a cylindrical container with a U-shaped pressure boosting pipe to achieve automatic drainage. However, it is only suitable for a single-path low-pressure gas environment and cannot meet the synchronous drainage requirements of multiple high-pressure tapping pipes in gas turbine combustion chamber tests. Furthermore, it lacks a temperature control module, failing to address the issue of water vapor re-condensation. Some test benches have attempted to use heating methods to heat the pressure tapping pipes to evaporate moisture inside. However, simple heating methods often suffer from uneven heating and inaccurate temperature control, easily leading to measurement errors. In addition, the large number of pressure channels requires each to have independent drainage and heating capabilities, while simultaneously ensuring overall system integration and portability, further increasing the engineering difficulty.

[0005] In summary, to address the issues of measurement errors, pressure scanning valve damage, and decreased system reliability caused by liquid water retention in the pressure tapping path during gas turbine combustor testing, it is urgently necessary to propose a pressure scanning valve pretreatment cabinet for a gas turbine combustor test bench with water removal function. This would ensure that no liquid water enters the pressure tapping pipe and pressure scanning valve, thus protecting the equipment while obtaining accurate test data. Summary of the Invention

[0006] (I) Purpose of the Invention

[0007] The purpose of this invention is to address the shortcomings of existing technologies by providing a pretreatment cabinet for the pressure scanning valve of a gas turbine combustor test bench with water removal function, and its control method, thereby solving the problems mentioned in the background. This invention integrates a multi-channel three-way reversing solenoid valve drainage structure, a high-temperature heater temperature control unit, and a flexible honeycomb heat tracing pipe assembly to achieve efficient removal of liquid water from the pressure-sensing pipeline before testing and continuous heat preservation and dehumidification of the pressure-sensing gas path during testing. This effectively avoids interference from liquid water on pressure transmission characteristics and corrosion damage to the pressure scanning valve. The system possesses advantages such as rapid deployment, modular access, multi-channel parallel operation, precise temperature control, and flexible mobility, making it widely applicable to various types of gas turbine combustor bench testing scenarios and improving the stability, reliability, and data accuracy of the pressure testing system.

[0008] (II) Technical Solution

[0009] To achieve the objective of this invention and solve its technical problems, the present invention adopts the following technical solution:

[0010] The first objective of this invention is to provide a pretreatment cabinet for the pressure scanning valve of a gas turbine combustor test bench with a water removal function. This cabinet is used to remove liquid water and perform high-temperature drying on multiple pressure channels leading from the test section during gas turbine combustor testing, ensuring the accuracy of pressure signal transmission and the safe operation of the pressure scanning valve. The cabinet includes a cabinet body, an air inlet, a three-way reversing solenoid valve, a heater, a water collector, and a heat tracing pipe, wherein:

[0011] The cabinet is designed as a movable, enclosed structure, which allows the system to be moved and deployed between different test benches, and provides installation space and protection for internal components.

[0012] The heater is installed inside the cabinet to heat and maintain the temperature inside the cabinet at a preset temperature. The heater is also equipped with a temperature sensor to monitor and provide feedback on the temperature status inside the cabinet in real time.

[0013] The three-way reversing solenoid valves are configured in multiples and installed in an array inside the cabinet. Each three-way reversing solenoid valve has a three-port structure with an inlet, an outlet and a drain outlet.

[0014] The air intake interface is provided with multiple channels. The inlet end of each air intake interface is connected to the pressure channel on the gas turbine test section, and the outlet end passes through the cabinet and is connected to the inlet of each three-way reversing solenoid valve.

[0015] The water collector is located at the bottom of the cabinet, with a water inlet at the top and a pipeline connecting it to the drain outlet of each three-way reversing solenoid valve. It also has a drainage channel at the bottom extending to the outside of the cabinet to discharge liquid water to the outside of the cabinet.

[0016] The heat tracing pipe is designed as a flexible composite pipe structure, with multiple pressure-sensing pipes inside. The outer wall of each pressure-sensing pipe is covered with a constant-power heat tracing cable connected to an external power source to heat the pressure-sensing pipe to a preset temperature. The spaces between the multiple pressure-sensing pipes are filled with a ceramic fiber layer for fixation and heat insulation, and the outside is covered with a high-temperature resistant flexible fluororubber protective layer. One end of the heat tracing pipe extends out of the cabinet wall, and the inlet end of each pressure-sensing pipe is connected to the outlet of each three-way reversing solenoid valve. The outlet end is connected to an externally installed pressure scanning valve via a quick-connect connection.

[0017] The second objective of this invention is to provide a control method for the pretreatment cabinet of the pressure scanning valve on the gas turbine combustion chamber test bench with water removal function, comprising the following steps:

[0018] SS1. System Initialization and Connection Establishment:

[0019] Before the gas turbine combustor test begins, the pretreatment cabinet is moved to the designated test bench position, the multiple air intake interfaces are connected to the pressure tapping channels of the test section respectively, and the outlet ends of each pressure tapping pipe in the heat tracing pipe are connected to the pressure scanning valve to build a complete pressure signal transmission link.

[0020] SS2. Preparation for draining pressure lines:

[0021] All three-way reversing solenoid valves are switched synchronously to the air intake-drainage mode, where the inlet and outlet are connected. The residual liquid water in the pressure tapping pipe is discharged using the internal pressure of the gas turbine test section. The liquid water is collected in the water collector and discharged to the outside of the cabinet through the drainage channel at its bottom until no obvious liquid water flows out.

[0022] SS3. System Heating and Temperature Control:

[0023] Once drainage is detected, switch all three-way reversing solenoid valves to the intake-output mode where the inlet and outlet are connected. Simultaneously, start the heater and heating tape. The heater heats the temperature inside the cabinet and maintains it at the preset working temperature, while the heating tape heats each pressure pipe along its path to the preset working temperature.

[0024] SS4. High-temperature insulation and dynamic evaporative dehumidification:

[0025] During the formal test of the combustion chamber, the heater output and the working state of the heating cable are continuously maintained, and the temperature status inside the cabinet is continuously monitored by the temperature sensor configured in the heater to maintain the entire system operating within the preset working temperature range, ensuring that the trace amount of liquid water entering the pressure tube can be vaporized in time.

[0026] SS5. End of Test and System Dismantling:

[0027] After the combustion chamber test is completed, the heater and heat tracing are turned off in sequence, all three-way reversing solenoid valves are de-energized and reset, and the connection between the intake port and the test section pressure channel and the connection between the heat tracing pipe and the pressure scanning valve are disconnected respectively. The pretreatment cabinet is removed from the current test bench and moved to the next test position.

[0028] (III) Technical Effects

[0029] Compared with existing technologies, the pretreatment cabinet for the pressure scanning valve of the gas turbine combustor test bench with water removal function and its control method of the present invention have the following beneficial and significant technical effects: Compared with traditional pretreatment cabinets, this pretreatment cabinet solves the problem of inaccurate pressure scanning valve measurements or even equipment damage caused by liquid water entering the pressure tapping pipe, and specifically solves practical problems according to testing technical requirements. Compared with traditional pretreatment cabinets, this pretreatment cabinet is equipped with four universal wheels at the bottom, allowing the entire pretreatment cabinet to be freely moved to different test benches for use. The air inlet section and heat tracing pipe in the present invention are equipped with connectors, allowing the pretreatment cabinet to be quickly disassembled and removed from the test after the combustor test is completed. The heat tracing pipe has a certain degree of flexibility while removing liquid water, facilitating connection with the pressure scanning valve at different locations. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the pretreatment cabinet of the pressure scanning valve on the gas turbine combustion chamber test bench with water removal function according to the present invention.

[0031] Figure 2 This is a schematic diagram of the airflow direction of the three-way reversing solenoid valve in this invention;

[0032] Figure 3 This is a schematic diagram of a cross-section of the heat tracing pipe in this invention;

[0033] Figure 4 This is a flowchart of the control method for the pretreatment cabinet of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] Cabinet 1, Air Inlet 2, Three-way Reversing Solenoid Valve 3, Inlet 31, Drain 32, Outlet 33, Heater 4, Casters 5, Water Collector 6, Heat Tracing Pipe 7, Pressure Pipe 71, Constant Power Heat Tracing Cable 72, Ceramic Fiber Layer 73, Fluororubber Protective Layer 74. Detailed Implementation

[0036] The purpose of this invention is to provide a pretreatment cabinet for the pressure scanning valve of a gas turbine combustor test bench with water removal function and its control method. This cabinet is used to remove liquid water and perform high-temperature drying treatment on multiple pressure channels leading from the test section during gas turbine combustor testing, ensuring the accuracy of pressure signal transmission and the safe operation of the pressure scanning valve. To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be described in more detail below with reference to the accompanying drawings. The described embodiments are some, but not all, embodiments of this invention, and are exemplary, intended to explain the invention, and should not be construed as limiting the invention.

[0037] Example 1: Pressure Scanning Valve Pretreatment Cabinet

[0038] like Figure 1-3 As shown, the gas turbine combustion chamber test bench pressure scanning valve pretreatment cabinet with water removal function provided in this embodiment includes a cabinet body 1, an air inlet 2, a three-way reversing solenoid valve 3, a heater 4, casters 5, a water collector 6, and a heat tracing pipe 7.

[0039] Cabinet 1 is designed as a movable, enclosed structure to facilitate the deployment of the system between different test benches and to provide installation space and protection for internal components. Cabinet 1 has a metal frame structure, with at least one side featuring an operable door. When closed, the door is sealed with a silicone rubber sealing strip for insulation and sealing. Four casters 5 with braking function are installed under cabinet 1, allowing the entire pretreatment cabinet to move freely and be moved and locked in place between different test benches.

[0040] There are 19 air inlet ports 2. The inlet end of each air inlet port 2 is connected to the pressure channel on the gas turbine test section. The outlet end is an air inlet pipe that passes through the cabinet and is connected to the inlet 31 of each three-way reversing solenoid valve in the cabinet 1. The outlet 33 of each three-way reversing solenoid valve is led out to the heat tracing pipe 7 through a pipe. The drain port 32 of the three-way reversing solenoid valve is connected to the water collector 6 through a pipe.

[0041] There are 19 three-way reversing solenoid valves 3, arranged in a matrix in cabinet 1. Each three-way reversing solenoid valve 3 has a three-port structure with an inlet 31, an outlet 32, and a drain port 33, and each of the three ports is connected to a pipe. The 19 three-way reversing solenoid valves 3 can simultaneously change the flow path according to different signals. All the pipes connected from the drain port 32 of the three-way reversing solenoid valve are connected to the water inlet at the top of the water collector 6, and a pipe is connected from the bottom of the water collector 6 to the outside of cabinet 1 to discharge liquid water to the outside of the cabinet.

[0042] Heater 4 is located inside cabinet 1 and can directly heat the interior of cabinet 1 to 230 degrees Celsius. Heater 4 also has a built-in temperature sensor to monitor the internal temperature of cabinet 1 in real time. The heat tracing pipe 7 contains 19 honeycomb-arranged pressure-sensing tubes 71, each containing a gas with constantly changing pressure. Each pressure-sensing tube 71 connects to the outlet 33 of the three-way reversing solenoid valve inside cabinet 1. The outer layer is wrapped with a constant-power heating cable 72, which can heat to 230 degrees Celsius. Each constant-power heating cable 72 is secured by a ceramic fiber layer 73, and the outermost layer of the heat tracing pipe 7 is wrapped with a fluororubber protective layer 74. A connector is provided at the end of the heat tracing pipe 7 for direct connection to the pressure scanning valve. The heat tracing pipe 7 is entirely made of flexible material, facilitating connection to the pressure scanning valve at different locations.

[0043] As a preferred embodiment, the number of each three-way reversing solenoid valve 3 corresponds one-to-one with the air inlet 2. The entire assembly is arranged in a modular array (the arrangement structure can be linear, matrix, or compact) and evenly distributed on the mounting bracket of the cabinet (1). Each three-way reversing solenoid valve (3) is independently controlled and can switch the path state independently or simultaneously according to different control signals. It supports two switchable working modes: air intake-drainage and air intake-output, which are used to realize pre-drainage treatment and normal pressure supply, respectively. In the air intake-drainage mode, the residual liquid water in the pressure pipe is discharged using the internal pressure of the gas turbine test section before the test. This is achieved by controlling the solenoid valve to open the inlet and the drain outlet. In the air intake-output mode, the gas pressure signal is transmitted during the combustion chamber test. This is achieved by controlling the solenoid valve to open the inlet and the outlet. In this mode, the heater and the heat tracing cable are started at the same time to prevent liquid water residue or generation by using the high temperature environment.

[0044] Preferably, heater 4 is located in the central or lower part of the cabinet. It is designed as an electric heating unit with closed-loop temperature control capability. It is equipped with a temperature control module and over-temperature protection function to heat the inside of cabinet 1 to a preset temperature (e.g., 230 degrees Celsius). Heater 4 is equipped with a temperature sensor to detect the temperature inside the cabinet in real time and feed it back to the control system to realize closed-loop temperature regulation and over-temperature protection, ensuring that the cabinet is kept at a high temperature to effectively evaporate residual water vapor.

[0045] Preferably, the water collector 6 is a sealed liquid collection chamber with multiple water inlet ports on its top. Each water inlet port is connected to the drain port 32 of each three-way reversing solenoid valve through an independently set pipeline. This is used to collect liquid water discharged from the pressure channel of the test section during the drainage process before the test. The drain channel at the bottom of the water collector 6 is equipped with a drain valve or a drain pump to discharge the accumulated water to the outside of the cabinet 1 after the drainage is completed.

[0046] Preferably, the pressure-sensing tubes 71 inside the heat tracing tube 7 are arranged in a honeycomb pattern in cross-section, and each pressure-sensing tube 71 is made of corrosion-resistant stainless steel, used to transmit the pressure signal of the gas turbine combustion chamber test section in real time; the constant power heat tracing tape 72 wrapped around the outer layer of each pressure-sensing tube 71 is a self-limiting heating tape and is connected to an external power source. Its output power is adjusted according to the surface temperature of the pressure-sensing tube, used to heat the pressure-sensing tube to a preset temperature (e.g., 230 degrees Celsius) along the way, ensuring that the pressure-sensing gas is always in a superheated state along the way, preventing water vapor condensation and liquid water retention.

[0047] The working principle and process of the pressure scanning valve pretreatment cabinet for a gas turbine combustion chamber test bench with water removal function provided in this embodiment of the invention are as follows:

[0048] Before the test, switch all three-way reversing solenoid valves 3 to connect the solenoid valve inlet 31 and the three-way reversing solenoid valve drain outlet 32 ​​to increase the pressure in the combustion chamber. This causes all the water in the pressure tapping pipe to flow through the three-way reversing solenoid valve drain outlet 32 ​​to the water collector 6, and then drain the water to the outside of the cabinet through the pipe of the water collector 6 until no obvious water flows out. This ensures that no liquid water remains in the pressure tapping pipe before the combustion chamber test.

[0049] After confirming that there is no obvious water flow from the water collector 6 pipe, switch all three-way reversing solenoid valves 3 to connect the solenoid valve inlet 31 and the three-way reversing solenoid valve outlet 33. Turn on the heater 4 and the constant power heating tape 72, and monitor the temperature inside the cabinet to ensure it reaches 230 degrees Celsius. Even if a small amount of liquid water enters the pressure tapping pipe after the combustion chamber test begins, it will evaporate due to the high temperature along the pipe, thus solving the problem of inaccurate pressure scanning valve readings or even equipment damage caused by liquid water entering the pressure tapping pipe.

[0050] After the combustion chamber test, the interfaces of the intake port 2 and the heat tracing pipe 7 are disconnected from the combustion chamber test bench and the pressure scanning valve, respectively. The entire pretreatment cabinet can be quickly disassembled and moved to the next combustion chamber test scenario.

[0051] Example 2: Control Method

[0052] Based on the hardware system architecture of the gas turbine combustor test bench pressure scanning valve pretreatment cabinet with water removal function disclosed in Embodiment 1, Embodiment 2 further provides a corresponding control method. The aim is to systematically achieve two-stage pretreatment of physical drainage and thermal drying by performing time-sequential and programmed coordinated control of the various actuators within the pretreatment cabinet. (Refer to...) Figure 4 The control flow diagram shown illustrates the specific implementation steps of this method as follows:

[0053] SS1. System Initialization and Connection Establishment:

[0054] Before the gas turbine combustor test begins, the pretreatment system is moved to the designated test bench position, the multi-inlet interface 2 is connected to the pressure tapping channel of the test section respectively, and the outlet end of each pressure tapping pipe 71 in the heat tracing pipe 7 is connected to the pressure scanning valve to construct a complete pressure signal transmission link.

[0055] SS2. Preparation for draining pressure lines:

[0056] All three-way reversing solenoid valves are switched synchronously to the air intake-drainage mode, where the inlet and outlet are connected. The residual liquid water in the pressure tapping pipe is discharged using the internal pressure of the gas turbine test section. The liquid water is collected in the water collector and discharged to the outside of the cabinet through the drainage channel at its bottom until no obvious liquid water flows out.

[0057] Furthermore, after the three-way reversing solenoid valve switches to the air intake-drainage mode, a stable airflow can be formed by applying forward backflushing gas or utilizing the steady-state air supply pressure of the test section itself to enhance the driving capability of the liquid water inside the pressure tapping pipe. Simultaneously, the liquid level sensor inside the water collector continuously monitors the liquid accumulation status. When the liquid level reaches the preset upper limit, it automatically triggers the drainage operation to ensure the safety and continuity of the drainage process. Drainage continues until there is no obvious water flow output from the drainage channel, at which point the drainage phase is considered complete.

[0058] SS3. System Heating and Temperature Control:

[0059] Once drainage is detected, switch all three-way reversing solenoid valves to the intake-output mode with the inlet and outlet connected. Simultaneously, start the heater and heating tape. The heater heats the temperature inside the cabinet and maintains it at the preset operating temperature, while the heating tape heats each pressure pipe along its path to the preset operating temperature.

[0060] As a preferred option, to achieve precise temperature control, the heater is dynamically adjusted using PWM power regulation to keep the temperature inside the cabinet within the preset operating temperature range. The heater is also equipped with a temperature sensor and a temperature control switch. If the temperature inside the cabinet is detected to rise abnormally above the safety threshold, the power is automatically cut off for protection, ensuring that the system operates under safe thermal control conditions.

[0061] SS4. High-temperature insulation and dynamic evaporative dehumidification:

[0062] After the combustion chamber officially enters the test operation phase, the system continuously maintains the operation of the heater and heating cable, and monitors the internal ambient temperature of the cabinet in real time through temperature sensors to keep the entire system in a high-temperature and dry state. During this process, if a trace amount of liquid water enters the pressure channel, it will rapidly vaporize under high temperature conditions, thereby avoiding interference with the pressure signal or damage to the pressure scanning valve, ensuring the timeliness and accuracy of the test data.

[0063] SS5. End of Test and System Dismantling:

[0064] After the test, the control system sequentially shuts off the power supply circuits of the heater and heating cable in a preset order to prevent thermal stress shock to the structure caused by a sudden temperature drop. Simultaneously, a short-term slow cooling mode is implemented to allow the system temperature to steadily decrease to a safe range. All three-way reversing solenoid valves are de-energized and reset to their initial state. Subsequently, the operator disconnects the connection between the air inlet 2 and the pressure tapping channel of the gas turbine test section, and disconnects the quick-connect interface between the heating pipe 7 and the pressure scanning valve, thus disconnecting the system. Afterward, the pretreatment cabinet can be moved to the next test bench position to prepare for a new round of testing.

[0065] In summary, the control method provided in this embodiment 2 works closely with the system structure scheme in embodiment 1, fully realizing the multi-stage coordinated control objectives of pre-test drainage, in-test dehumidification, and post-test safe disassembly, effectively supporting the high-quality operation of the gas turbine combustor test.

[0066] The objectives of this invention have been fully and effectively achieved through the above embodiments. Those skilled in the art will understand that this invention includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments described above. Although the invention has been described with reference to what is currently considered the most practical and preferred embodiments, it should be understood that the invention is not limited to the disclosed embodiments, and any modifications that do not depart from the functional and structural principles of the invention will be included within the scope of the claims.

Claims

1. A pressure scanning valve pretreatment cabinet for a gas turbine combustion chamber test bench with water removal function, characterized in that, The system includes a cabinet (1), an air inlet (2), a three-way reversing solenoid valve (3), a heater (4), a water collector (6), and a heat tracing pipe (7), wherein: The cabinet (1) is designed as a movable, sealed structure. The heater (4) is installed inside the cabinet to heat and maintain the temperature inside the cabinet at a preset temperature. The heater is equipped with a temperature sensor to monitor the temperature inside the cabinet in real time. The three-way reversing solenoid valve (3) is provided in multiple ways and is installed in an array inside the cabinet. Each three-way reversing solenoid valve is a three-port structure with an inlet, an outlet and a drain outlet. The air intake interface (2) is provided with multiple channels. The inlet end of each air intake interface is connected to the pressure channel on the gas turbine test section, and the outlet end passes through the cabinet and is connected to the inlet of each three-way reversing solenoid valve. The water collector (6) is located at the bottom of the cabinet. It has a water inlet at the top and is connected to the drain outlet of each three-way reversing solenoid valve (3) through a pipeline. It has a drainage channel extending to the outside of the cabinet at the bottom for discharging liquid water to the outside of the cabinet. The heat tracing pipe (7) is designed as a flexible composite pipe structure. It has multiple pressure-sensing pipes (71) inside. The outer wall of each pressure-sensing pipe is covered with a constant power heat tracing cable (72) connected to an external power source, which is used to heat the pressure-sensing pipe to a preset temperature along the way. The space between the multiple pressure-sensing pipes is filled with a ceramic fiber layer (73) for fixing and heat insulation. The outside is covered with a high-temperature resistant flexible fluororubber protective layer (74). One end of the heat tracing pipe (7) extends out of the cabinet wall. The inlet end of each pressure-sensing pipe is connected to the outlet of each three-way reversing solenoid valve. The outlet end is connected to the external pressure scanning valve in a quick-connect manner.

2. The pressure scanning valve pretreatment cabinet of the gas turbine combustion chamber test bench with water removal function according to claim 1, characterized in that: The number of the three-way reversing solenoid valves (3) corresponds one-to-one with the air inlet ports (2), and the whole is evenly arranged on the mounting bracket of the cabinet (1) in a modular array manner. Each three-way reversing solenoid valve (3) is independently controlled and can switch the path state independently or simultaneously according to different control signals. It supports two switchable working modes: air inlet-drainage and air inlet-output. The air inlet-drainage mode is used to drain the residual liquid water in the pressure tapping pipe using the internal pressure of the gas turbine test section before the test. This is achieved by controlling the solenoid valve to open the inlet and the drain port. The air inlet-output mode is used to transmit the gas pressure signal during the combustion chamber test. This is achieved by controlling the solenoid valve to open the inlet and the outlet. In this mode, the heater and the heat tracing cable are started at the same time to prevent liquid water residue or generation by using the high temperature environment.

3. The pressure scanning valve pretreatment cabinet of the gas turbine combustion chamber test bench with water removal function according to claim 1, characterized in that: The cabinet (1) is a metal frame structure. At least one side of the cabinet is equipped with an openable cabinet door. After the cabinet door is closed, a silicone rubber sealing strip for heat preservation and sealing is provided between the cabinet (1) and the door. Multiple casters with braking function are installed under the cabinet to realize the movement and positioning of the system between different test benches.

4. The pressure scanning valve pretreatment cabinet of the gas turbine combustion chamber test bench with water removal function according to claim 1, characterized in that: The heater (4) is located in the central or lower part of the cabinet. It is designed as an electric heating unit with closed-loop temperature control capability. It is equipped with a temperature control module and over-temperature protection function to heat the inside of the cabinet (1) to a preset temperature. The heater (4) is equipped with a temperature sensor to detect the temperature inside the cabinet in real time and feed it back to the control system.

5. The pressure scanning valve pretreatment cabinet of the gas turbine combustion chamber test bench with water removal function according to claim 1, characterized in that: The water collector (6) is a sealed liquid collection chamber with multiple water inlet ports on its top. Each water inlet port is connected to the drain port (32) of each three-way reversing solenoid valve through an independently set pipeline. The drain channel at the bottom of the water collector (6) is equipped with a drain valve or a drain pump to discharge the accumulated water to the outside of the cabinet (1) after the drainage is completed.

6. The pressure scanning valve pretreatment cabinet of the gas turbine combustion chamber test bench with water removal function according to claim 1, characterized in that: The pressure tubes (71) inside the heat tracing tube (7) are arranged in a honeycomb pattern in a uniform manner in cross-section, and each pressure tube (71) is made of corrosion-resistant stainless steel. The constant power heat tracing tape (72) wrapped around the outer layer of each pressure tube (71) is a self-limiting heating tape and is connected to an external power source. Its output power is adjusted according to the surface temperature of the pressure tube and is used to heat the pressure tube along the way to a preset temperature, ensuring that the pressure gas is always in a superheated state along the way.

7. A control method for a pressure scanning valve pretreatment cabinet of a gas turbine combustion chamber test bench with water removal function as described in any one of claims 1 to 6, characterized in that, Includes the following steps: Before the start of the gas turbine combustion chamber test, the pretreatment cabinet is moved to the designated test bench position, each air inlet (2) is connected to the pressure channel of the test section, and the outlet end of each pressure pipe (71) in the heat tracing pipe (7) is connected to the pressure scanning valve to build a complete pressure signal transmission link. SS2. Synchronously switch all three-way reversing solenoid valves to the intake-drainage mode where the inlet and drain outlet are connected. Use the internal pressure of the gas turbine test section to discharge the residual liquid water in the pressure tapping pipe. The liquid water is collected in the water collector and discharged to the outside of the cabinet through the drainage channel at the bottom of the collector until no obvious liquid water flows out. SS3. After drainage is completed, switch all three-way reversing solenoid valves to the intake-output mode with the inlet and outlet connected. At the same time, start the heater and heating tape. The heater heats the temperature inside the cabinet and maintains it at the preset working temperature. The heating tape heats each pressure pipe along its path to the preset working temperature. During the formal test of the SS4 combustion chamber, the heater output and the heat tracing cable are kept in working condition. The temperature inside the cabinet is continuously monitored by the temperature sensor configured in the heater to keep the entire system operating within the preset operating temperature range and ensure that the trace amount of liquid water entering the pressure tapping pipe can be vaporized in time. SS5. After the combustion chamber test is completed, turn off the heater and heating tape in sequence, de-energize and reset all three-way reversing solenoid valves, and disconnect the connection between the intake port and the test section pressure channel, as well as the connection between the heating pipe and the pressure scanning valve. The pretreatment cabinet is removed from the current test bench and moved to the next test position.

8. The control method according to claim 7, characterized in that, In step SS2, after the three-way reversing solenoid valve is switched to the air intake-drainage mode, a stable airflow is formed by applying positive backflushing gas or by using the steady-state air supply pressure of the test section itself. During the drainage process, the liquid level of the water collector is monitored in real time, and the drainage action is automatically triggered when the liquid level reaches the upper limit.

9. The control method according to claim 7, characterized in that, In step SS3, the heater is dynamically adjusted using PWM power regulation to keep the temperature inside the cabinet within the preset operating temperature range. The heater is equipped with a temperature sensor and a temperature control switch. If the temperature inside the cabinet rises abnormally to above the safety threshold, the power is automatically cut off for protection.

10. The control method according to claim 7, characterized in that, In step SS5, after the test is completed, the power supply circuits of the heating tape and the heater are shut off in a preset order to avoid thermal stress shock caused by sudden cooling. Before power is cut off, a short-term slow cooling mode is executed to slowly reduce the system temperature to below the ambient temperature before disassembling the system.

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