Steam injection equipment

Abstract

The invention belongs to the technical field of liquid rocket engine test processes, and particularly discloses steam injection equipment. The temperature-sensitive structure of the temperature detection piece is placed in the detection section, the temperature-sensitive structure is installed on the inner wall, close to the connection section, of the detection section, and the detection section of the temperature detection piece abuts against the outer wall of the connection section, so that the temperature-sensitive structure indirectly detects the temperature of the connection section; the thermosensitive structure is in communication connection with the signal acquisition equipment through a wire, the spraying piece is in communication connection with the signal acquisition equipment, and the spraying end of the spraying piece is arranged towards one side of the outer wall of the connecting section, so that the spraying piece can receive a spraying signal obtained after a temperature signal is converted by the signal acquisition equipment; therefore, the spraying piece can decide whether to spray and cool the connecting section or not according to the spraying signal. The steam injection equipment of the structure can measure and control the temperature of the connecting section in real time, and the practicability of the steam injection equipment is improved.

Description

Technical Field

[0001] The invention relates to the technical field of liquid rocket engine test process, and in particular to a steam ejection device. Background Art

[0002] Liquid rocket engines generally use nitro substances (such as nitrogen tetroxide) and hydrazine substances (such as unsymmetrical dimethyl hydrazine) that can self-ignite as propellants. When working in near space or space far from the ground, the engine propellant storage device often needs to work under high vacuum conditions. Therefore, if the engine is tested on the ground, it is necessary to establish a high vacuum environment at the corresponding altitude in the vacuum chamber to simulate the high-altitude working characteristics of the rocket engine. Since liquid rocket engines eject a large amount of high-speed, high-temperature, and highly corrosive combustion gases when working, in order to maintain the dynamic vacuum environment in the vacuum chamber, it is necessary to connect a large-volume exhaust device to eject the combustion gases.

[0003] The commonly used ejector for high-altitude simulation tests of liquid rocket engines is the steam ejector. The steam ejector uses a heating device (such as a steam boiler) to heat water to generate high-temperature and high-pressure water vapor as the ejection gas source, and sucks the gas generated by the ignition of the liquid rocket engine into the ejector, thereby ensuring that the vacuum chamber pressure is in a balanced state during the high-altitude test. In order to ensure that the steam volume of the ejector is stable and controllable, the steam sent into the steam boiler pipeline reaches the steam outlet through the straight pipe section and enters the steam ejector. The gas temperature of the existing liquid rocket engine can reach up to 3000℃. Since the engine gas enters the steam ejector through the diffuser, the temperature of the connection section between the diffuser and the ejector pipeline continues to rise during the experiment. Excessive temperature will cause the connection section to crack, which will lead to the interruption of the test. Without changing the main structure of the connection section, the main body of the connection section is usually cooled by spraying cooling water. The operator controls the start of the spray device by observing the color change of the appearance of the connection section, and turns off the spray device after the color returns to normal.

[0004] However, since the operator relies on sensory organs to observe the color of the connection section, which is highly subjective, the spray device may not be opened or closed in time, thereby delaying the test operation and causing the steam injection equipment to be insufficiently practical. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is that in the prior art, since the operator relies on sensory organs to observe the color of the connecting section, which is highly subjective, the spray device may not be opened or closed in time, resulting in insufficient practicality of the steam injection equipment.

[0006] To this end, the present invention provides a steam injection device, comprising:

[0007] Diffuser;

[0008] An ejector pipe, the ejector pipe is connected to the diffuser through a connecting section;

[0009] A temperature detection component, the temperature detection component includes a detection section and a thermosensitive structure, the detection section is in contact with the outer wall of the connecting section, the thermosensitive structure is placed inside the detection section and installed on the inner wall of the detection section close to the connecting section, the thermosensitive structure is connected to the signal acquisition device through a wire, the thermosensitive structure is used to detect the temperature of the outer wall of the connecting section and generate a temperature signal at the same time, and the generated temperature signal is fed back to the signal acquisition device to be converted into a spray signal;

[0010] A spraying component is communicatively connected with the signal acquisition device and is used to receive a spraying signal. The spraying component is provided with a spraying end, and the spraying direction of the spraying end is arranged toward one side of the outer wall of the connecting section.

[0011] Optionally, the steam injection device mentioned above,

[0012] The temperature detection element also includes a shell, and a containing cavity is provided inside the shell;

[0013] The detection section is fixedly installed or movably installed in the accommodating cavity.

[0014] Optionally, the steam injection device mentioned above,

[0015] One side of the accommodating cavity is an opening, and an outer wall of the shell away from the opening is connected to an outer wall of the connecting section;

[0016] The temperature detection component also includes a holding means and a transition section, the holding means and the detection section are spaced apart, the transition section is located between the holding means and the detection section, one end of the transition section is fixedly connected to the holding means, and the other end of the transition section is directly or indirectly connected to the detection section, and the holding means drives the transition section to move in the accommodating cavity toward or away from the connecting section under the action of external force until the holding means abuts against the end surface on one side of the opening of the accommodating cavity.

[0017] Optionally, the steam injection device mentioned above,

[0018] The temperature detection component also includes a bias section, which is located between the detection section and the transition section. Both ends of the bias section are respectively connected to the detection section and the transition section. The bias section is in a compressed state under the action of external force.

[0019] Optionally, the steam injection device mentioned above,

[0020] When the bias section is in a natural state, the sum of the length of the bias section, the transition section and the detection section is greater than the length of the housing.

[0021] Optionally, the steam injection device mentioned above,

[0022] The shell is also provided with a through hole, and the through hole connects the outside with the accommodating cavity.

[0023] Optionally, the steam injection device mentioned above,

[0024] The axial direction of the through hole is arranged to intersect with the connection direction of the holding means and the transition section.

[0025] Optionally, the steam injection device mentioned above,

[0026] The length of the accommodating cavity is equal to the sum of the lengths of the transition section and the detection section.

[0027] Optionally, the steam injection device mentioned above,

[0028] The outer wall of the transition section is provided with an external thread structure, the inner wall of the shell is provided with an internal thread structure, and the transition section is threadedly connected to the shell.

[0029] Optionally, the steam injection device mentioned above,

[0030] It also includes a sealing member, which is installed at the connection point where the wire passes through the detection section.

[0031] The technical solution provided by the present invention has the following advantages:

[0032] The steam ejection device provided by the present invention comprises a diffuser, an ejection pipe, a temperature detection part and a spray part. The ejection pipe is connected to the diffuser through a connecting section; the temperature detection part includes a detection section and a thermosensitive structure, the detection section abuts against the outer wall of the connecting section, the thermosensitive structure is placed inside the detection section and installed on the inner wall of the detection section close to the connecting section, the thermosensitive structure is connected to the signal acquisition device through a wire, the thermosensitive structure is used to detect the temperature of the outer wall of the connecting section and generate a temperature signal at the same time, and the generated temperature signal is fed back to the signal acquisition device to be converted into a spray signal; the spray part is connected to the signal acquisition device for receiving the spray signal, and the spray part is provided with a spray end, and the spray direction of the spray end is set toward the outer wall of the connecting section.

[0033] The steam ejection device of this structure places the thermistor structure of the temperature detection part inside the detection section and installs the thermistor structure on the inner wall of the detection section close to the connecting section, so that the thermistor structure can detect the temperature of the detection section; at this time, since the connecting section connects the ejection pipe and the diffuser, and the detection section of the temperature detection part abuts against the outer wall of the connecting section, the temperature at the detection section is consistent with the temperature of the connecting section, so that the thermistor structure indirectly detects the temperature of the connecting section; and since the thermistor structure is connected to the signal acquisition device through a wire, the temperature detected by the thermistor structure can be converted into a temperature signal; in addition, since the spray part is connected to the signal acquisition device through communication, and the spray end of the spray part is arranged toward the outer wall of the connecting section, the spray part can receive the spray signal after the temperature signal is converted by the signal acquisition device, so that the spray part can decide whether to spray and cool the connecting section according to the spray signal. Compared with the existing scheme in which the operator relies on the sensory organs to observe the color of the connecting section, the steam ejection device of this structure can measure and control the temperature of the connecting section in real time, thereby improving the practicality of the steam ejection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A schematic structural diagram of a steam injection device provided in an embodiment of the present invention;

[0036] Figure 2 The steam injection device provided in the embodiment of the present invention is a structural schematic diagram of a first embodiment;

[0037] Figure 3 A half-section schematic diagram of a shell of the steam ejection device provided in an embodiment of the present invention when it is in the first embodiment;

[0038] Figure 4 A schematic structural diagram of a second implementation mode of the steam injection device provided in an embodiment of the present invention;

[0039] Figure 5 A half-section schematic diagram of a shell of the steam ejection device provided in an embodiment of the present invention when the steam ejection device is in the second embodiment;

[0040] Description of reference numerals:

[0041] 1- Diffuser;

[0042] 2-Ejection pipe;

[0043] 3-Connection segment;

[0044] 41-detection section; 42-thermosensitive structure; 43-housing; 431-accommodating cavity; 432-through hole; 44-holding means; 45-transition section; 46-bias section;

[0045] 5-Wire;

[0046] 6-Spray parts;

[0047] 7-Steam pipeline. DETAILED DESCRIPTION

[0048] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0052] Example 1

[0053] This embodiment provides a steam injection device, such as Figures 1 to 5As shown, it includes a diffuser 1, an ejection pipe 2, a temperature detection component and a spray component 6. Among them, the ejection pipe 2 is connected to the diffuser 1 through the connecting section 3; the temperature detection component includes a detection section 41 and a thermosensitive structure 42, the detection section 41 is in contact with the outer wall of the connecting section 3, which can ensure that the structure measured by the detection section 41 can directly reflect the temperature change of the outer wall of the connecting section 3, the thermosensitive structure 42 is placed inside the detection section 41 and installed on the inner wall of the detection section 41 close to the connecting section 3, the thermosensitive structure 42 is connected to the signal acquisition device through the wire 5, the thermosensitive structure 42 is used to detect the temperature of the outer wall of the connecting section 3 and generate a temperature signal at the same time, and the generated temperature signal is fed back to the signal acquisition device to be converted into a spray signal; the spray component 6 is connected to the signal acquisition device for receiving the spray signal, and the spray component 6 is provided with a spray end, and the spray direction of the spray end is set toward the outer wall of the connecting section 3.

[0054] The steam injection device of this structure places the thermistor structure 42 of the temperature detection element inside the detection section 41, and installs the thermistor structure 42 on the inner wall of the detection section 41 close to the connecting section 3, so that the thermistor structure 42 can detect the temperature of the detection section 41; at this time, since the connecting section 3 connects the injection pipe 2 and the diffuser 1, and the detection section 41 of the temperature detection element is in contact with the outer wall of the connecting section 3, the temperature at the detection section 41 is consistent with the temperature of the connecting section 3, so that the thermistor structure 42 indirectly detects the temperature of the connecting section 3; and since the thermistor structure 42 is communicatively connected to the signal acquisition device through the wire 5, the temperature detected by the thermistor structure 42 can be converted into a temperature signal; in addition, since the spray element 6 is communicatively connected to the signal acquisition device, and the spray end of the spray element 6 is arranged toward the outer wall of the connecting section 3, the spray element 6 can receive the spray signal after the temperature signal is converted by the signal acquisition device, so that the spray element 6 can decide whether to spray and cool the connecting section 3 according to the spray signal. Compared with the existing solution in which the operator relies on sensory organs to observe the color of the connecting section 3, the steam injection device of this structure can measure and control the temperature of the connecting section 3 in real time, thereby improving the practicality of the steam injection device.

[0055] It can be explained that, in this embodiment, there is no limitation on the types of the detection section 41 and the thermal sensitive structure 42. In order to follow the existing practice, the detection section 41 is selected as a probe, and the thermal sensitive structure 42 is selected as a PT100 sensitive element.

[0056] It can be explained that, in this embodiment, the structure of the detection section 41 is not limited. As one of the implementation modes, the detection section 41 is selected as a cylindrical structure with a hollow interior, and one end face is flat, and the center of the other end face is provided with a through hole 432 for the wire 5 to pass through, and the PT100 sensitive element is in direct contact with the cylindrical structure; after the wire 5 passes through the through hole 432, it is connected to the lead of the PT100 sensitive element, such as by welding.

[0057] In order to facilitate the installation of the detection section 41 and the thermal sensitive structure 42, as shown in FIG. Figures 1 to 5 As shown, in the steam injection device provided in this embodiment, the temperature detection component further includes a housing 43. At this time, a receiving cavity 431 is provided inside the housing 43; and the detection section 41 is fixedly installed or movably installed in the receiving cavity 431.

[0058] like Figures 1 to 5 As shown, the steam injection device provided in this embodiment has an opening on one side of the accommodating cavity 431, and the outer wall of the shell 43 away from the opening is connected to the outer wall of the connecting section 3; the temperature detecting component also includes a gripping means 44 and a transition section 45, the gripping means 44 is spaced apart from the detecting section 41, the transition section 45 is located between the gripping means 44 and the detecting section 41, one end of the transition section 45 is fixedly connected to the gripping means 44, and the other end of the transition section 45 is directly or indirectly connected to the detecting section 41, and the gripping means 44 drives the transition section 45 to move in the accommodating cavity 431 toward or away from the connecting section 3 under the action of an external force until the gripping means 44 abuts against the end face on one side of the opening of the accommodating cavity 431.

[0059] As one embodiment, when the transition section 45 is indirectly connected to the detection section 41, Figure 1 , Figure 4 and Figure 5 As shown, in the steam injection device provided in this embodiment, the temperature detection component also includes a bias section 46, and the bias section 46 is located between the detection section 41 and the transition section 45. The two ends of the bias section 46 are respectively connected to the detection section 41 and the transition section 45, and the bias section 46 is in a compressed state under the action of an external force.

[0060] It can be explained that, in this embodiment, when the biasing section 46 is in a natural state, the sum of the lengths of the biasing section 46 , the transition section 45 and the detection section 41 is greater than the length of the housing 43 .

[0061] As another embodiment, Figures 1 to 3 As shown, when the transition section 45 is directly connected to the detection section 41 , the steam injection device provided in this embodiment is further provided with a through hole 432 on the outer shell 43 , and the through hole 432 connects the outside with the accommodating cavity 431 .

[0062] In the steam injection device of this structure, since the gas inside the shell 43 will expand when the temperature detection part is heated, an exhaust hole is provided on the shell 43, and the expanded gas will be transmitted to the external environment through the exhaust hole. That is, in a high temperature environment, the shell 43 is prevented from forming a blind cavity and being damaged, so that the connection between the shell 43 and the outer wall of the connecting section 3 is more reliable.

[0063] It can be explained that, in this embodiment, the axial direction of the through hole 432 is arranged to intersect with the connection direction of the holding member 44 and the transition section 45 .

[0064] It can be explained that, in this embodiment, the length of the accommodating cavity 431 is equal to the sum of the lengths of the transition section 45 and the detection section 41 .

[0065] In addition, it should be noted that Figures 1 to 5 As shown, the steam injection device provided in this embodiment, no matter whether the transition section 45 is directly or indirectly connected to the detection section 41, the outer wall of the transition section 45 is provided with an external thread structure, and the inner wall of the outer shell 43 is provided with an internal thread structure, and the transition section 45 is threadedly connected to the outer shell 43, so that the temperature detection component can be fixed on the outer shell 43 as a whole, making the detection section 41 abutting against the outer wall of the connecting section 3 more reliable.

[0066] Furthermore, if Figures 1 to 5 As shown, in this embodiment, no matter whether the transition section 45 is directly or indirectly connected to the detection section 41, the transition section 45 is set as a tubular structure with a threaded outer surface. At this time, the outer diameter of the transition section 45 is larger than the size of the probe, and the inner diameter of the shell 43 is adapted to the outer diameter of the transition section 45; at the same time, another through hole 432 coaxial with the through hole 432 of the detection section 41 is provided at the center of the transition section 45, and the wire 5 passes through the through hole 432 of the transition section 45 and the through hole 432 of the detection section 41 and is connected to the lead of the PT100 sensitive element.

[0067] Furthermore, if Figures 1 to 5 As shown, in this embodiment, the structure of the gripping means 44 is not limited. For ease of operation, the gripping means 44 is selected to be a structure that can be used by a wrench to twist the hexagonal prism, so that when the wrench is clamped on any two oppositely arranged side walls of the hexagonal prism and rotates, the transition section 45 is driven to gradually rotate out or into the housing 43, thereby opening or closing the accommodating cavity 431. At this time, a third through hole 432 coaxial with the through hole 432 is provided inside the gripping means 44, and the wire 5 passes through the third through hole 432, the through hole 432 of the transition section 45, and the through hole 432 of the detection section 41, and is connected to the lead of the PT100 sensitive element.

[0068] Furthermore, if Figures 1 to 5 As shown, in this embodiment, the holding means 44 and the transition section 45 are integrally formed, and in order to facilitate machining, a tool withdrawal groove is provided at the connection between the holding means 44 and the transition section 45 .

[0069] In addition, it should be noted that Figure 1 , Figure 4 and Figure 5As shown, in the steam ejection device provided in this embodiment, if the transition section 45 is indirectly connected to the detection section 41, the structure of the biasing member is not limited; it can be selected as a component with a partial or entire spring structure, such as a spring. At the same time, the connection method between the spring and the detection section 41 and the transition section 45 is not limited. One end of the spring can be welded to the end face of the detection section 41 away from the outer wall of the connecting section 3, and the other end of the spring can be sleeved on the outside of the external thread structure or welded to the end face of the external thread structure close to the detection section 41, so that the position of the detection section 41 can be changed when the spring is stretched or contracted.

[0070] In addition, it should be noted that Figures 1 to 5 As shown, the steam ejection device provided in this embodiment further includes a sealing member, which is installed in the through hole 432 through which the wire 5 passes through the detection section 41. This can prevent the cooling water sprayed by the spraying member 6 from entering the detection section 41 from the wire 5 itself to affect the use of the thermosensitive structure 42, thereby preventing the electrical function of the temperature detection member in the steam ejection device from being affected.

[0071] Furthermore, in this embodiment, the selection of the sealing member is not limited, and the sealing member may be a raw tape, a sealing pad, or a sealing adhesive, etc. In specific implementation, a raw tape is wound around the external thread structure, and a sealing pad is installed at the through hole 432 or a high temperature resistant sealing adhesive is applied to the through hole 432 for sealing.

[0072] In addition, it should be noted that in the above embodiment, when selecting the wire 5, the wire 5 with a water-repellent insulating skin on the surface is selected, and the two ends of the wire 5 are respectively connected to the leads of the PT100 sensitive element and the signal acquisition device.

[0073] For the steam injection device of the above structure, if the transition section 45 is indirectly connected to the detection section 41, during installation, the outer shell 43 is first welded to the outer wall of the connecting section 3, and then the transition section 45 and the outer shell 43 are threadedly connected, and then the gripping means 44 is tightened toward the side of the connecting section 3 using a wrench. At this time, the bias section 46 is under pressure. When the temperature at the connecting section 3 increases, the temperature of the outer shell 43 gradually increases. At this time, since the interior of the outer shell 43 is a blind cavity, that is, the internal volume is fixed, the gas inside the outer shell 43 will expand after being heated. At this time, the gas will compress the spring, and the spring will adjust the position of the detection section 41 by its own deformation, so that the detection section 41 is always in contact with the outer wall of the connecting section 3, making the measurement of the temperature of the connecting section 3 more reliable.

[0074] For the steam injection device of the above structure, if the transition section 45 is directly connected to the detection section 41, during installation, the outer shell 43 is first welded to the outer wall of the connecting section 3, and then the transition section 45 and the outer shell 43 are threadedly connected, and then the gripping means 44 is tightened toward the side of the connecting section 3 using a wrench until the detection section 41 abuts against the outer wall of the connecting section 3. At this time, an exhaust hole is opened on the outer shell 43. When the temperature at the connecting section 3 increases, the temperature of the outer shell 43 gradually increases, and the gas is discharged to the outside through the exhaust hole after being heated and expanded, that is, the outer shell 43 is protected. At the same time, the detection section 41 can always abut against the outer wall of the connecting section 3, making the measurement of the temperature of the connecting section 3 more reliable.

[0075] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. 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 the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A steam injection device, characterized in that: include: Diffuser (1); An ejector pipe (2), the ejector pipe (2) being connected to the diffuser (1) via a connecting section (3); A temperature detection component, the temperature detection component includes a detection section (41) and a thermosensitive structure (42), the detection section (41) is in contact with the outer wall of the connecting section (3), the thermosensitive structure (42) is placed inside the detection section (41) and installed on the inner wall of the detection section (41) close to the connecting section (3), the thermosensitive structure (42) is connected to the signal acquisition device through a wire (5), the thermosensitive structure (42) is used to detect the temperature of the outer wall of the connecting section (3) and generate a temperature signal at the same time, and the generated temperature signal is fed back to the signal acquisition device to be converted into a spray signal; A spraying component (6), the spraying component (6) is communicatively connected to the signal acquisition device and is used to receive a spraying signal, the spraying component (6) is provided with a spraying end, and the spraying direction of the spraying end is arranged toward one side of the outer wall of the connecting section (3).

2. The steam injection device according to claim 1, characterized in that: The temperature detection element further comprises a housing (43), wherein a receiving cavity (431) is provided inside the housing (43); The detection section (41) is fixedly installed or movably installed in the accommodating cavity (431).

3. The steam injection device according to claim 2, characterized in that: One side of the accommodating cavity (431) is an opening, and an outer wall of the outer shell (43) away from the opening is connected to an outer wall of the connecting section (3); The temperature detection component also includes a holding means (44) and a transition section (45), wherein the holding means (44) and the detection section (41) are spaced apart, and the transition section (45) is located between the holding means (44) and the detection section (41), one end of the transition section (45) is fixedly connected to the holding means (44), and the other end of the transition section (45) is directly or indirectly connected to the detection section (41), and under the action of an external force, the holding means (44) drives the transition section (45) to move in a direction approaching or away from the connecting section (3) in the accommodating cavity (431) until the holding means (44) abuts against an end surface on one side of an opening of the accommodating cavity (431).

4. The steam injection device according to claim 3, characterized in that: The temperature detection component also includes a biasing section (46), wherein the biasing section (46) is located between the detection section (41) and the transition section (45), and the two ends of the biasing section (46) are respectively connected to the detection section (41) and the transition section (45), and the biasing section (46) is in a compressed state under the action of an external force.

5. The steam injection device according to claim 4, characterized in that: When the bias section (46) is in a natural state, the sum of the lengths of the bias section (46), the transition section (45) and the detection section (41) is greater than the length of the housing (43).

6. The steam injection device according to claim 3, characterized in that: The housing (43) is also provided with a through hole (432), and the through hole (432) connects the outside with the accommodating cavity (431).

7. The steam injection device according to claim 6, characterized in that: The axial direction of the through hole (432) is arranged to intersect with the connection direction of the holding means (44) and the transition section (45).

8. The steam injection device according to claim 6, characterized in that: The length of the accommodating cavity (431) is equal to the sum of the lengths of the transition section (45) and the detection section (41).

9. The steam injection device according to any one of claims 3 to 8, characterized in that: The outer wall of the transition section (45) is provided with an external thread structure, the inner wall of the outer shell (43) is provided with an internal thread structure, and the transition section (45) is threadedly connected to the outer shell (43).

10. The steam injection device according to any one of claims 2 to 8, characterized in that: It also includes a sealing member, which is installed at the connection point where the wire (5) passes through the detection section (41).

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