Fuel gas sampling device

Abstract

The invention relates to a fuel gas sampling device. The fuel gas sampling device comprises a shell with a gas flow channel and a sampling rake connected with the shell, the sampling rake is a hollow rod, a first water-cooling flow channel and a first air-cooling flow channel are arranged on the side wall of the sampling rake, a water inlet of the first water-cooling flow channel is connected with a first cooling water supply device, and an air inlet of the first air-cooling flow channel is connected with a first air supply device; one end of the sampling rake is arranged in the shell, the other end of the sampling rake is arranged outside the shell, and a sampling rake body positioned in the shell is provided with a collecting hole for collecting fuel gas. Through the device, high-temperature tail gas is collected and cooled, so that the detection equipment can analyze and detect the collected gas and cannot be damaged.

Description

Technical Field

[0001] The present invention relates to the technical field of aviation engines, and in particular to a gas sampling device. Background Art

[0002] In order to inspect the operating status of aircraft engines, it is necessary to detect the combustion exhaust gas after the aircraft engine combustion chamber, including the temperature and composition of the exhaust gas. At present, in order to realize exhaust gas detection, an exhaust gas collection device is generally set at the exhaust end of the combustion chamber, and then the gas collected by the collection device is analyzed by the detection device. Due to the high exhaust temperature of the aircraft engine combustion chamber, the average outlet temperature has exceeded 1600℃, and the hot spot temperature has reached more than 2000℃, which is beyond the test range of most thermocouples. The high-temperature gas collected by the collection device is not treated, and the high-temperature gas will damage the detection equipment during detection.

[0003] Prior art CN111610028A discloses a displacement temperature measuring device suitable for high temperature and high pressure rectangular test pieces, comprising a water-cooled measuring section cavity, a displacement mechanism, a displacement rod, an air-cooled sealing strip and a multi-point temperature measuring rake; the wall of the water-cooled measuring section cavity is a circulating connected cavity, the upper end of the cavity is provided with a water outlet joint, the lower end is provided with a water inlet joint, and both ends are provided with a water-cooled measuring section front flange and a water-cooled measuring section rear flange; a displacement mechanism is provided on a displacement mechanism mounting seat on the upper end surface of the water-cooled measuring section cavity, which is connected to the air-cooled sealing strip through a displacement rod, and the air-cooled sealing strip is installed Installed in the dovetail groove base; a multi-point temperature measuring rake is provided on the middle part of the air-cooled sealing strip, and the multi-point temperature measuring rake body extends into the cavity of the water-cooled measuring section cavity, and cooling air inlets are provided at both ends, which are connected with the cavity in the air-cooled sealing strip; a plurality of thermocouple wires are provided in the multi-point temperature measuring rake body, which are arranged from top to bottom in the multi-point temperature measuring rake body to form a plurality of thermocouple measuring points; the shifting mechanism includes a stepping motor, a lead screw, a base, a slider and a slider connector, the brackets at both ends of the base are connected to the lead screw, a slider is provided on the lead screw, one end of which is connected to the stepping motor shaft, and the slider is connected to the shifting rod.

[0004] The temperature measuring device disclosed in the prior art cools down the high temperature gas through a water-cooled cavity, and then uses a temperature measuring rake for detection. Since the high temperature gas has a high pressure and a high speed, the gas after passing through the cavity still has a high temperature. During detection, the thermocouple on the temperature measuring rake also has the problem of burning out. Summary of the invention

[0005] The technical problem solved by the present invention is to overcome the problems existing in the prior art and to provide a gas sampling device which utilizes a sampling rake to cool and collect tail gas so that a detection device can directly detect the collected gas without being damaged.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] Disclosed is a gas sampling device, comprising a shell with an air flow channel and a sampling rake connected to the shell; the sampling rake is a hollow rod, and a first water-cooling channel and a first air-cooling channel are arranged in the side wall of the sampling rake, the water inlet of the first water-cooling channel is connected to a first water supply device for cooling water, and the air inlet of the first air-cooling channel is connected to a first air supply device; one end of the sampling rake is arranged in the shell, and the other end is arranged outside the shell, and a collection hole for collecting gas is arranged on the sampling rake body located in the shell.

[0008] Preferably, the number of the collecting holes is seven.

[0009] Preferably, the collection holes are arranged at intervals.

[0010] Preferably, the cross section of the sampling rake is fan-shaped.

[0011] Preferably, a second water-cooling channel and a second air-cooling channel are provided on the shell, the water inlet of the second water-cooling channel is connected to a second cooling water supply device, and the air inlet of the second air-cooling channel is connected to a second air supply device.

[0012] Preferably, flanges are provided at both ends of the shell.

[0013] Preferably, the sampling device further comprises a motor connected to the housing, and a rotating shaft connecting the motor and the sampling rake, and the housing is provided with a groove for the sampling rake to swing relative to the housing under the action of the motor.

[0014] Preferably, one end of the sampling rake located outside the housing is connected to a gas analysis device.

[0015] Preferably, the shell is further provided with a total temperature and total pressure rake, and a sensing probe for measuring the gas temperature and pressure is arranged inside the total temperature and total pressure rake.

[0016] Preferably, the total temperature and total pressure rake is provided with an air film hole, and the sensing probe is arranged in the air film hole.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1) High-temperature tail gas is collected by a sampling rake, and water cooling and air cooling are set on the sampling rake to achieve rapid cooling of the gas. The cooled gas can be detected and analyzed by conventional detection equipment without damaging the detection equipment, so that the sampling device can meet the detection of high-temperature tail gas.

[0019] 2) The shell adopts a double cooling structure to prevent the shell from deforming under the action of high temperature gas.

[0020] 3) The sampling rake rotates under the action of the motor to achieve rotary sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A three-dimensional diagram of a gas sampling device of the present invention;

[0022] Figure 2 It is a front view of a gas sampling device of the present invention;

[0023] Figure 3 It is a cross-sectional view of a sampling rake in a gas sampling device of the present invention;

[0024] Figure 4 The present invention is a schematic diagram of the total temperature and total pressure rake structure in a gas sampling device. DETAILED DESCRIPTION

[0025] In order to clearly illustrate the technical features of the present solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0027] In addition, in the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0028] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] In the present application, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0030] Example 1

[0031] like Figures 1 to 3 As shown, a gas sampling device comprises a shell 1 having an air flow channel and a sampling rake 2 connected to the shell 1; the sampling rake 1 is a hollow rod, and a first water-cooling channel 3 and a first air-cooling channel 4 are arranged in the side wall of the sampling rake 1, the water inlet of the first water-cooling channel 3 is connected to a first water supply device for cooling water, and the air inlet of the first air-cooling channel 4 is connected to a first air supply device; one end of the sampling rake 2 is arranged in the shell 1, and the other end is arranged outside the shell 1, and a collection hole 5 for collecting gas is arranged on the body of the sampling rake 2 located in the shell 1.

[0032] The housing 1 is used as a connecting component with the rear end of the engine. Both ends of the housing 1 may be provided with connecting flanges, and the housing 1 is connected to the engine through the flanges. The combustion exhaust gas of the engine all flows into the housing 1 and is discharged from the rear end of the housing 1. Since the combustion exhaust gas of the engine is a high-temperature and high-pressure gas, through this design, the external gas cannot enter the interior of the housing 1, thereby preventing the external gas from entering the housing 1 and affecting the detection.

[0033] A sampling rake 2 is arranged in the housing 1, and the tail gas is collected through the sampling rake 2. In order to cool the collected gas, a corresponding cooling device needs to be arranged on the sampling rake 2.

[0034] The sampling rake 2 is a hollow rod, one end of which is located inside the housing 1, thereby serving as a sampling end, and the other end of which is located outside the housing 1, thereby serving as a gas delivery end.

[0035] A first water cooling channel 3 and a first air cooling channel 4 are provided in the side wall of the sampling rake 2. The water inlet of the first water cooling channel 3 is connected to the first water supply device, and cooling water flows into the first water cooling channel 3 from the water inlet and flows out from the water outlet of the first water cooling channel 3 or is directly gasified under the action of high temperature and discharged from the water outlet.

[0036] The low-temperature gas provided by the first gas supply device enters the first air-cooling flow channel 4 from the gas inlet, and is finally discharged from the gas outlet.

[0037] The exhaust gas of the engine enters the sampling rake from the collection hole 5 of the sampling end 2, and is transmitted from the conveying end to other analysis equipment. Under the action of water cooling and gas, the temperature of the sampling rake 2 will be much lower than the temperature of the high-temperature gas. Then, under the action of heat transfer, the sampling rake 2 will also absorb the collected gas temperature, thereby achieving the cooling of the collected gas. The collected gas after cooling can be detected and analyzed by commonly used analysis equipment or galvanic couples. The risk of burning the galvanic couple due to high temperature of the collected gas is avoided, and the service life of the galvanic couple is increased.

[0038] In this embodiment, the air inlet and the water inlet of the sampling rake 2 can be specifically arranged on the conveying end, and the air outlet and the water inlet can be arranged on the conveying end or on the sampling end.

[0039] Finally, the collected gas is analyzed by a component analyzer, and the actual temperature of the exhaust gas during the exhaust period is reversely deduced based on the component ratio. To further verify the actual temperature of the exhaust gas, a total temperature and total pressure rake can be set in the shell, such as Figure 4 As shown, a thermocouple 10 for measuring the gas temperature and a pressure measuring tube 11 for measuring the gas are arranged in the total temperature and total pressure rake. An air film hole 9 is arranged on the total temperature and total pressure rake, and detection probes such as the thermocouple 10 and the pressure measuring tube 11 are arranged in the air film hole 9. The induction probe is cooled through the air film hole 9 to ensure the service life of the induction probe.

[0040] In this embodiment, the sampling device further includes a motor 6 connected to the housing 1, and a rotating shaft connecting the motor 6 and the sampling rake 2. At the same time, a corresponding groove is provided on the housing 1, and the sampling rake 2 is connected to the groove. The sampling rake 2 swings relative to the housing 1 under the action of the motor 6.

[0041] In order to prevent the high-temperature exhaust gas in the housing 1 from overflowing from the groove, a corresponding sealing device can be provided on the outside of the housing 1. The sealing device can be a commonly used device in the industry to achieve sealing, or a high-pressure gas injection device can be added to the outside of the housing 1 to inject high-pressure gas into the groove through the gas injection device, thereby preventing the gas in the housing 1 from flowing out of the housing 1 by utilizing the gas pressure difference.

[0042] The output end of the motor 6 passes through a reducer, and the reducer is connected to the rotating shaft through a gear pair. The sampling rake 2 is driven to rotate by the motor 6, and each rotation angle is generally set to 120 degrees, thereby realizing rotation sampling.

[0043] Specifically, in order to improve collection efficiency, the collection hole 5 can be set as a tapered hole.

[0044] It has been verified that through cooling, the high-temperature exhaust gas at the rear end of the combustion (high-temperature gas parameters: average temperature 2000°C, maximum pressure 0.8MPa, maximum flow rate 60kg / s, Mach number Ma≤0.3) can be sampled and analyzed without burning detection equipment such as galvanic couples, thereby increasing the service life of the detection equipment.

[0045] Example 2

[0046] A gas sampling device comprises a shell 1 having an air flow channel and a sampling rake 2 connected to the shell 1; the sampling rake 1 is a hollow rod, and a first water-cooling channel 3 and a first air-cooling channel 4 are arranged in the side wall of the sampling rake 1, the water inlet of the first water-cooling channel 3 is connected to a first cooling water supply device, and the air inlet of the first air-cooling channel 4 is connected to a first air supply device; one end of the sampling rake 2 is arranged in the shell 1, and the other end is arranged outside the shell 1, and a collection hole 5 for collecting gas is arranged on the sampling rake 2 body located in the shell 1.

[0047] The difference between this embodiment and the first embodiment is that the number of the collection holes 5 on the sampling rake 2 can be multiple, specifically seven, and by increasing the number of collection holes 5, multi-point collection is achieved, thereby providing the final analysis result of the gas.

[0048] The collection holes 5 can be arranged at equal intervals, or can be arranged in an equal annular surface in the radial direction of the sampling rake 2 .

[0049] In this embodiment, the cross section of the sampling rake 2 can be specifically set to be fan-shaped. The priority of this design is to reduce wind resistance and also to increase the collection area. Of course, the sampling rake 2 can also be other shapes such as cylindrical or square.

[0050] Example 3

[0051] A gas sampling device comprises a shell 1 having an air flow channel and a sampling rake 2 connected to the shell 1; the sampling rake 1 is a hollow rod, and a first water-cooling channel 3 and a first air-cooling channel 4 are arranged in the side wall of the sampling rake 1, the water inlet of the first water-cooling channel 3 is connected to a first cooling water supply device, and the air inlet of the first air-cooling channel 4 is connected to a first air supply device; one end of the sampling rake 2 is arranged in the shell 1, and the other end is arranged outside the shell 1, and a collection hole 5 for collecting gas is arranged on the sampling rake 2 body located in the shell 1.

[0052] The difference between this embodiment and embodiment 1 is that in order to prevent the shell 1 from deforming under high temperature, the shell 1 can be made of high temperature resistant material. Specifically, a second water cooling channel and a second air cooling channel can be provided on the shell 1, the water inlet 7 of the second water cooling channel is connected to the second cooling water supply device, and the air inlet 8 of the second air cooling channel is connected to the second air supply device. The shell also has double cooling to ensure the service life of the shell.

[0053] Example 4

[0054] A gas sampling test method is disclosed. After the gas sampling device is connected and fixed to the engine, the water supply device and the gas supply device connected to the sampling rake 2 and the shell are started first, and then back-blowing air is introduced into the sampling rake 2 to prevent unburned fuel from entering the sampling pipeline during combustion. Sampling is performed by rotation, and finally the components of the collected gas are analyzed by a component analyzer, and the initial temperature of the gas is derived according to the analysis results. Finally, the analysis of the gas is completed.

[0055] Obviously, the above embodiments are merely examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A gas sampling device, characterized in that: It comprises a shell with an airflow channel and a sampling rake connected to the shell; the sampling rake is a hollow rod, and a first water-cooling channel and a first air-cooling channel are arranged in the side wall of the sampling rake, the water inlet of the first water-cooling channel is connected to a first water supply device for cooling water, and the air inlet of the first air-cooling channel is connected to a first air supply device; one end of the sampling rake is arranged in the airflow channel of the shell, and the other end is arranged outside the shell, and a collection hole for collecting gas is arranged on the sampling rake body located in the shell.

2. A gas sampling device according to claim 1, characterized in that: The number of the collecting holes is seven.

3. A gas sampling device according to claim 1, characterized in that: The cross section of the sampling rake is fan-shaped.

4. A gas sampling device according to claim 1, characterized in that: The shell is provided with a second water-cooling channel and a second air-cooling channel, the water inlet of the second water-cooling channel is connected to a second cooling water supply device, and the air inlet of the second air-cooling channel is connected to a second air supply device.

5. A gas sampling device according to claim 4, characterized in that: Flanges are arranged at both ends of the shell.

6. A gas sampling device according to claim 1, characterized in that: The sampling device also includes a motor connected to the shell, and a rotating shaft connecting the motor and the sampling rake; the shell is provided with a groove for the sampling rake to swing relative to the shell under the action of the motor.

7. A gas sampling device according to claim 6, characterized in that: The groove is a square groove.

8. A gas sampling device according to claim 1, characterized in that: One end of the sampling rake located outside the shell is connected to a gas analysis device.

9. A gas sampling device according to claim 1, characterized in that: The shell is also provided with a total temperature and total pressure rake, and a sensing probe for measuring the gas temperature and pressure is arranged inside the total temperature and total pressure rake.

10. A gas sampling device according to claim 9, characterized in that: The total temperature and total pressure rake is provided with an air film hole, and the sensing probe is arranged in the air film hole.

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