Telescopic ignition electric nozzle with detachable ignition rod

Abstract

The invention relates to the technical field of ignition electric nozzles, in particular to a telescopic ignition electric nozzle with a detachable ignition rod, which comprises an ignition assembly, a gas turbine cylinder body, a flame tube and a cylinder shell mounted on the outer wall of the gas turbine cylinder body, a piston is arranged in the cylinder shell, the ignition rod is arranged in the piston, and the ignition rod is arranged in the flame tube. Connecting threads are arranged on the outer side of the ignition rod, and the ignition rod and the piston control the length of the ignition rod extending out of the air cylinder shell by adjusting assembly of the connecting threads so as to determine the ignition position. The device has the beneficial effects that on one hand, the position of the ignition end of the ignition rod extending into the high-temperature gas channel can be properly adjusted by adjusting the relative mounting positions of the piston and the ignition rod, the ignition boundary of the gas turbine is widened, and the ignition success rate of the gas turbine is increased; on the other hand, when the ignition end of the ignition rod is abraded, ablated and the like, the ignition rod can be independently replaced, the situation that a traditional ignition electric nozzle needs to be replaced in a whole set is changed, and the operation and maintenance cost of a gas turbine power plant is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of ignition nozzles, in particular to a telescopic ignition nozzle with a detachable ignition rod. Background Art

[0002] Heavy-duty gas turbine power generation technology plays an important role in power grid peak regulation due to its advantages such as fast start-up speed, strong fuel adaptability, high combustion efficiency, low pollutant emissions, compact structure, and easy peak regulation.

[0003] As one of the key auxiliary devices of heavy-duty gas turbines, the high-energy ignition device of gas turbines is mainly composed of ignition transformers, ignition cables, ignition nozzles and other components. During the working stage of the ignition device, the AC power supply is rectified after being stepped up by the transformer, and the high voltage electricity is introduced into the ignition nozzle by the ignition cable. The ignition nozzle discharges through the tip, and the high voltage and small current generated break through the air discharge ignition, thereby igniting the combustible mixed gas in the combustion chamber of the gas turbine. Therefore, the normal operation of the high-energy ignition device is a prerequisite for the ignition of the combustion chamber and the normal operation of the entire unit.

[0004] During the ignition process, the ignition rod of the retractable high-energy ignition nozzle is extended into the flame tube for ignition. After successful ignition, the ignition rod withdraws from the main combustion zone. After working for a long time, the ignition end is prone to ablation, carbon deposition, semiconductor material defects and other phenomena. In addition, frequent startup of the engine causes the ignition rod to be prone to wear and sticking. For this reason, the ignition nozzle is replaced during the engine maintenance. However, the ignition nozzle retractable device and ignition rod of the currently active engine adopt an integrated design, and the ignition rod cannot be replaced separately, resulting in increased engine operation and maintenance costs. Summary of the invention

[0005] Some simplifications or omissions may be made in this section and the abstract and title of the present application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0006] The invention aims to provide a telescopic ignition nozzle with a detachable ignition rod.

[0007] Therefore, the purpose is to solve the problem that the ignition nozzle telescopic device and the ignition rod of the currently used gas turbine adopt an integrated design and the ignition rod cannot be replaced separately.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions: a telescopic ignition nozzle with a detachable ignition rod, comprising an ignition assembly, comprising a combustion engine cylinder body and a flame tube, a cylinder housing installed on the outer wall of the combustion engine cylinder body, a piston is arranged inside the cylinder housing, an ignition rod is arranged inside the piston, a connecting thread is arranged on the outside of the ignition rod, the ignition rod and the piston are assembled by adjusting the connecting thread to control the length of the ignition rod extending out of the cylinder housing to determine the ignition position, and the piston fixes the ignition rod by a lower locking plate and an upper locking plate; a retraction assembly, comprising a labyrinth sealing structure arranged on the outside of the piston, the labyrinth sealing structure is arranged obliquely toward the combustion engine cylinder body, a spring that applies external force to the piston is abutted above the piston, and when the ignition is successful, the piston is driven by the gas pressure to move the ignition rod in a direction away from the combustion engine cylinder body; a lower piston conical sealing surface is arranged on the top of the piston, and when the piston is moved in a direction away from the combustion engine cylinder body by an external force, the lower piston conical sealing surface is used to seal with the contact surface of the cylinder housing to block the gas.

[0009] As a preferred solution of the telescopic ignition nozzle with a detachable ignition rod of the present invention, an annular air channel is provided between the cylinder housing and the flame tube, the annular air channel is used to transport air into the flame tube, and a high-temperature fuel gas channel is provided inside the flame tube for combustion reaction and transportation of combustion products.

[0010] As a preferred solution of the telescopic ignition nozzle with a detachable ignition rod of the present invention, a mounting flange is provided between the cylinder housing and the engine cylinder body, the mounting flange is fixedly connected to the engine cylinder body by bolts, and the mounting flange and the cylinder housing are fixed by bolts.

[0011] As a preferred solution of the telescopic ignition nozzle with a detachable ignition rod of the present invention, the piston divides the interior of the cylinder housing into an upper chamber and a lower chamber, and the volumes of the upper chamber and the lower chamber change with the movement of the piston.

[0012] As a preferred solution of the telescopic ignition nozzle with a detachable ignition rod of the present invention, an end cover is fixed to the end of the cylinder housing away from the mounting flange, an upper spring positioning groove is provided on the end cover to fix the upper end of the spring, and a lower spring positioning groove is provided on the piston to fix the lower end of the spring.

[0013] As a preferred solution of the telescopic ignition nozzle with a detachable ignition rod of the present invention, wherein: the angle between the labyrinth sealing structure and the central axis of the ignition rod is 45°-75°, the width-to-depth ratio of the labyrinth sealing structure is 0.8-1, and the number of the labyrinth sealing structures is 6-12;

[0014] A support rib is fixed to the end surface of the piston facing the mounting flange, and the support rib is used to abut against the mounting flange, so that a cavity is left between the mounting flange and the support rib to allow the required gas to flow in and push the piston to move.

[0015] As a preferred solution of the telescopic ignition nozzle with a detachable ignition rod of the present invention, the mounting flange and the engine cylinder body are respectively provided with a flange through hole and an engine cylinder through hole for accommodating the movable insertion of the ignition rod, the inner diameters of the flange through hole and the engine cylinder through hole are consistent, and the flame tube is provided with a flame tube through hole for accommodating the movable insertion of the ignition rod, and the inner diameter of the flame tube through hole is smaller than the engine cylinder through hole.

[0016] As a preferred solution of the telescopic ignition nozzle with a detachable ignition rod of the present invention, the ignition rod is composed of an ignition positive electrode and an ignition rod shell, the ignition positive electrode is located inside the ignition rod shell, an insulating ceramic tube is fixed between the ignition positive electrode and the ignition rod shell, a positive electrode contact is provided at one end of the ignition positive electrode away from the flame tube, and an ignition cable fastening thread is provided at one end of the ignition positive electrode away from the flame tube.

[0017] As a preferred solution of the retractable ignition nozzle with a detachable ignition rod of the present invention, there is a gap between the flame tube through hole, the engine cylinder through hole and the ignition rod housing. When the ignition rod is successfully ignited, the gas enters the cylinder housing through the gap to push the piston to move.

[0018] As a preferred solution of the telescopic ignition nozzle with a detachable ignition rod of the present invention, the end cover is provided with an upper piston conical sealing surface that is sealed with the lower piston conical sealing surface, and the end cover is provided with an end cover through hole that accommodates the ignition rod shell to move through.

[0019] The beneficial effects of the telescopic ignition nozzle with a detachable ignition rod of the present invention are as follows: on the one hand, the position of the ignition end of the ignition rod extending into the high-temperature gas channel can be appropriately adjusted by adjusting the relative installation position of the piston and the ignition rod, thereby widening the ignition boundary of the gas turbine and improving the ignition success rate of the gas turbine; on the other hand, when the ignition end of the ignition rod has problems such as wear and ablation, the ignition rod can be replaced separately, changing the situation in which the traditional ignition nozzle needs to be replaced as a whole, thereby reducing the operation and maintenance costs of the gas turbine power plant.

[0020] The outer wall of the piston adopts a labyrinth sealing structure, and the labyrinth sealing structure and the inner wall of the cylinder housing are slidably matched. The labyrinth groove is inclined in the direction of the mounting flange. On the one hand, the sealing structure is conducive to suppressing air leakage between the piston and the inner wall of the cylinder housing, ensuring that the force of the annular cavity air acting on the piston end face is sufficient to balance the spring force and push the ignition rod to quickly and reliably withdraw from the high-temperature gas channel; on the other hand, the sealing structure has the advantages of wear resistance and long service life. It is not easy to have problems such as the ignition rod being stretched and stuck due to deformation of the sealing structure, ensuring that the ignition rod can be safely and reliably stretched and retracted.

[0021] The design of the tapered sealing surface helps to form a tight seal between the piston and the end cover to prevent gas leakage. During normal operation, the ignition rod is fully retracted, and the sealing surfaces of the piston and the end cover fit tightly, effectively preventing the air in the annular cavity from leaking to the outside. The improved sealing performance helps to protect the ignition nozzle and avoid ignition failure or damage caused by air leakage. Reducing air leakage can improve the operating efficiency of the gas turbine because more air can participate in the combustion process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0023] Figure 1 The figure is a schematic diagram of the overall three-dimensional structure of the telescopic ignition nozzle with a detachable ignition rod in the present invention.

[0024] Figure 2 The present invention is a schematic cross-sectional view of the cylinder housing of a telescopic ignition nozzle with a detachable ignition rod.

[0025] Figure 3 The invention provides a retractable ignition nozzle with a detachable ignition rod. Figure 2 Schematic diagram of the enlarged structure of part A in the middle.

[0026] Figure 4 It is a schematic diagram of the ignition rod retraction demonstration structure of the telescopic ignition nozzle with a detachable ignition rod in the present invention.

[0027] Figure 5 The invention provides a retractable ignition nozzle with a detachable ignition rod. Figure 4 Schematic diagram of the enlarged structure of part B in the middle.

[0028] In the figure:

[0029] 100, ignition assembly; 101, engine cylinder block; 102, cylinder housing; 103, piston; 104, connecting thread; 105, ignition rod; 106, lower locking plate;

[0030] 101a, flame tube; 101b, engine cylinder through hole; 101c, flame tube through hole;

[0031] 102a, mounting flange; 102b, upper chamber; 102c, lower chamber; 102d, end cover; 102e, upper spring positioning groove; 102f, lower spring positioning groove; 102g, flange through hole;

[0032] 103a, supporting rib;

[0033] 105a, ignition positive electrode; 105b, ignition rod housing; 105c, insulating ceramic tube; 105d, positive electrode contact; 105e, ignition cable fastening thread;

[0034] 106a, locking piece;

[0035] 200, retraction assembly; 201, labyrinth seal structure; 202, spring;

[0036] 300, conical sealing surface of lower piston; 301, conical sealing surface of upper piston; 302, through hole of end cover. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0040] Example 1

[0041] Reference Figure 1-3, which is the first embodiment of the present invention, and provides a telescopic ignition nozzle with a detachable ignition rod, including an ignition assembly 100, which includes a combustion engine cylinder 101 and a flame tube 101a, a cylinder housing 102 installed on the outer wall of the combustion engine cylinder 101, a piston 103 is arranged inside the cylinder housing 102, an ignition rod 105 is arranged inside the piston 103, a connecting thread 104 is provided on the outer side of the ignition rod 105, and the ignition rod 105 and the piston 103 are adjusted by The assembly of the connecting thread 104 controls the length of the ignition rod 105 extending out of the cylinder housing 102 to determine the ignition position. The ignition rod 105 is composed of an ignition positive electrode 105a and an ignition rod housing 105b. The ignition positive electrode 105a is located inside the ignition rod housing 105b. An insulating ceramic tube 105c is fixed between the ignition positive electrode 105a and the ignition rod housing 105b. The piston 103 fixes the ignition rod 105 through a lower locking plate 106 and an upper locking plate 106a.

[0042] In this embodiment, a connecting thread 104 is provided in the middle section of the ignition rod housing 105b, and the ignition rod housing 105b is threadedly connected to the piston 103 through the connecting thread 104. Therefore, the length of the ignition rod 105 extending out of the cylinder housing 102 is controlled by adjusting the threaded assembly position of the piston 103 and the ignition rod 105, thereby determining the ignition position of the ignition rod 105 in the flame tube 101a, and the piston 103 and the ignition rod 105 are fastened by the lower locking piece 106 and the upper locking piece 106a to improve the reliability of the fixation of the two. Among them, the lower locking piece 106 and the upper locking piece 106a are preferably spring locking pieces or locking washers and other components.

[0043] The ignition rod 105 includes an ignition positive electrode 105a, an ignition rod shell 105b and an insulating ceramic tube 105c. The ignition rod shell 105b acts as a negative electrode. The insulating ceramic tube 105c separates the ignition positive electrode 105a from the ignition rod shell 105b to prevent a short circuit between the ignition positive electrode 105a and the ignition rod shell 105b. The upper end of the ignition positive electrode 105a is designed with an ignition rod 105 positive electrode contact 105d. The ignition rod 105 positive electrode contact 105d and the ignition rod shell 105b are connected to a high-voltage power supply through an ignition cable. The upper end of the ignition rod shell 105b is arranged with an ignition cable fastening thread 105e to ensure good contact between the ignition cable and the ignition rod 105 and improve the spark energy at the ignition end. The ignition positive electrode 105a and the ignition rod shell 105b are both made of high-temperature resistant alloy materials.

[0044] The retraction assembly 200 includes a labyrinth sealing structure 201 provided on the outer side of the piston 103. The labyrinth sealing structure 201 is inclined toward the engine cylinder body 101. The labyrinth sealing structure 201 is inclined toward the engine cylinder body 101, which helps to guide the gas flow and form a vortex structure, thereby improving the sealing performance and reducing the risk of gas leakage. A spring 202 that applies external force to the piston 103 is abutted above the piston 103. When ignition is successful, the piston 103 is driven by the gas pressure to drive the ignition rod 105 to move away from the engine cylinder body 101; the lower piston conical sealing surface 300 is provided at the top of the piston 103. When the piston 103 is moved away from the engine cylinder body 101 by the external force, the lower piston conical sealing surface 300 is used to seal with the contact surface of the cylinder housing 102 to seal the gas.

[0045] The labyrinth seal structure 201 is designed on the outside of the piston 103 and is tilted toward the engine cylinder 101. This design can improve the sealing effect and prevent gas leakage, thereby improving the combustion efficiency. A spring 202 is abutted on the top of the piston 103. Before ignition, the piston 103 is acted upon by the elastic force of the spring 202, driving the ignition rod 105 to move toward the engine cylinder 101. This design can ensure that the piston 103 can respond quickly when the ignition is successful, thereby improving the ignition efficiency. The labyrinth seal structure 201 is composed of a plurality of tortuous channels, which can be continuous or composed of a series of spaced sealing sheets.

[0046] An annular air passage a is provided between the cylinder housing 102 and the flame tube 101a, and the annular air passage a is used to transport air into the flame tube 101a and remove fuel that may remain in the combustion chamber. The flame tube 101a is provided with a high-temperature gas passage b for combustion reaction and transportation of combustion products. A mounting flange 102a is provided between the cylinder housing 102 and the engine cylinder block 101, and the mounting flange 102a is fixedly connected to the engine cylinder block 101 by bolts, and the mounting flange 102a and the cylinder housing 102 are fixed by bolts.

[0047] The annular cavity air passage a conveys air into the flame tube 101a to mix with the fuel and burn. The high-temperature gas passage b inside the flame tube 101a is used for combustion reaction and transportation of combustion products, which helps to transport the high-temperature gas generated by combustion to the downstream of the gas turbine, thereby driving the turbine to rotate and generate power. The design of the mounting flange 102a makes the installation and removal of the cylinder housing 102 more convenient, and is convenient for regular inspection and maintenance.

[0048] Example 2

[0049] Reference Figure 2-4, which is the second embodiment of the present invention, is different from the previous embodiment in that the piston 103 divides the interior of the cylinder housing 102 into an upper chamber 102b and a lower chamber 102c, and the volumes of the upper chamber 102b and the lower chamber 102c change with the movement of the piston 103. An end cover 102d is fixed to one end of the cylinder housing 102 away from the mounting flange 102a, and an upper spring positioning groove 102e for fixing the upper end of the spring 202 is formed on the end cover 102d, and a lower spring positioning groove 102f for fixing the lower end of the spring 202 is formed on the piston 103. The angle between the labyrinth seal structure 201 and the central axis of the ignition rod 105 is 45°-75°. This angle range allows the labyrinth seal structure 201 to reduce the friction resistance when the piston 103 moves while maintaining good sealing performance; the width-to-depth ratio of the labyrinth seal structure 201 is 0.8-1, so that the labyrinth seal structure 201 has enough space to accommodate and guide the gas flow to form a vortex structure; the number of labyrinth seal structures 201 is 6-12, and the number of labyrinth seal structures 201 directly affects its sealing effect. More labyrinth seal structures 201 can provide better sealing performance. The end face of the piston 103 facing the mounting flange 102a is fixed with a support rib 103a, which is used to abut against the mounting flange 102a, so that a cavity is left between the mounting flange 102a and the support rib 103a, so that the required gas can flow in to push the piston 103 to move.

[0050] In this embodiment, the ignition rod 105 has two forms: an extended state and a retracted state. In the extended state, the ignition end of the ignition rod 105 extends into the high-temperature gas channel b. In the retracted state, the ignition end of the ignition rod 105 is located outside the high-temperature gas channel b, but the ignition rod 105 passes through the annular cavity air channel a and continues to extend downward into the flame tube through hole 101c.

[0051] Specifically, when the gas turbine is not started, the air pressure in the lower chamber 102c of the cylinder housing 102 is normal pressure, the spring 202 pushes the piston 103 toward the mounting flange 102a, the ignition rod 105 connected to the piston 103 becomes extended, and the ignition end of the ignition rod 105 enters the high-temperature gas channel b to prepare for ignition;

[0052] When the ignition is successful, the high-voltage power supply loads nearly 10,000 volts of high voltage electricity to the ignition rod 105. At the ignition end, the air between the ignition positive electrode 105a and the ignition rod housing 105b serving as the negative electrode is punctured and discharged to form sparks, which ignite the combustible mixed gas in the high-temperature gas channel b. When the ignition is successful, the air pressure in the annular cavity air channel a increases instantly, and the annular cavity air enters the lower chamber 102c of the cylinder housing 102 through the gap between the engine cylinder body through hole 101b and the flange through hole 102g and the ignition rod 105. The force of the annular cavity air acting on the lower end surface of the piston 103 is greater than the elastic force of the spring 202, driving the piston 103 to move toward the end cover 102d, and the ignition end of the ignition rod 105 gradually retreats from the high-temperature gas channel b, which can prevent the ignition rod 105 from being ablated by the high-temperature gas and extend the service life of the ignition rod 105.

[0053] Among them, the outer wall of the piston 103 adopts a labyrinth sealing structure 201, and the labyrinth sealing structure 201 and the inner wall of the cylinder housing 102 adopt a sliding fit. The labyrinth sealing structure 201 is inclined in the direction of the mounting flange 102a. On the one hand, the sealing structure is conducive to preventing air leakage between the piston 103 and the inner wall of the cylinder housing 102, so that the force of the annular cavity air acting on the end face of the piston 103 is sufficient to balance the elastic force of the spring 202, ensuring that the ignition rod 105 can be quickly and reliably withdrawn from the high-temperature gas channel b; on the other hand, it has the advantages of wear resistance and long service life, and is not prone to problems such as the ignition rod 105 being stretched and stuck due to deformation of the sealing structure, ensuring that the ignition rod 105 can be safely and reliably stretched and retracted.

[0054] In addition, a plurality of supporting ribs 103a are provided on the end surface of the piston 103 close to the mounting flange 102a to separate the piston 103 from the mounting flange 102a, thereby ensuring that after successful ignition, the force exerted by the annular cavity air on the end surface of the piston 103 is sufficient to push the ignition rod 105 back.

[0055] Example 3

[0056] Reference Figure 4-5, which is the third embodiment of the present invention, and further provides a telescopic ignition nozzle with a detachable ignition rod. The mounting flange 102a and the combustion engine cylinder 101 are respectively provided with a flange through hole 102g and a combustion engine cylinder through hole 101b for accommodating the ignition rod 105 to be movably inserted, and the inner diameters of the flange through hole 102g and the combustion engine cylinder through hole 101b are consistent, and the flame tube 101a is provided with a flame tube through hole 101c for accommodating the ignition rod 105 to be movably inserted, and the inner diameter of the flame tube through hole 101c is smaller than the combustion engine cylinder through hole 101b. The ignition rod 105 is composed of an ignition positive electrode 105a and an ignition rod housing 105b. The ignition positive electrode 105a is located inside the ignition rod housing 105b. An insulating ceramic tube 105c is fixed between the ignition positive electrode 105a and the ignition rod housing 105b. A positive electrode contact 105d is provided at one end of the ignition positive electrode 105a away from the flame tube 101a. An ignition cable fastening thread 105e is provided at one end of the ignition rod housing 105b away from the flame tube 101a. There is a gap between the flame tube through hole 101c and the engine cylinder through hole 101b and the ignition rod housing 105b. When the ignition rod 105 is successfully ignited, the gas enters the cylinder housing 102 through the gap to push the piston 103 to move. The end cover 102d is provided with an upper piston conical sealing surface 301 that is butted and sealed with the lower piston conical sealing surface 300, and the end cover 102d is provided with an end cover through hole 302 that accommodates the ignition rod housing 105b to movably pass through.

[0057] In this embodiment, after the ignition rod 105 is completely retracted, the conical sealing surface 300 of the lower piston fits tightly with the conical sealing surface 301 of the upper piston, preventing the air in the annular cavity from leaking out of the ignition nozzle through the gap between the labyrinth sealing structure 201 and the cylinder housing 102 and the end cover through hole 302 between the ignition rod 105 and the end cover 102d, thereby effectively preventing the gas turbine output power from decreasing. During the movement of the piston 103 toward the end cover 102d, the spring 202 is compressed and stores energy, preparing for the extension of the ignition rod 105 when the gas turbine is shut down.

[0058] Among them, a lower piston conical sealing surface 300 is provided on the end surface of the piston 103 close to the end cover 102d, and an upper piston conical sealing surface 301 is also provided on the end surface of the end cover 102d close to the piston 103. The angle of the lower piston conical sealing surface 300 is exactly the same as that of the upper piston conical sealing surface 301. When the ignition rod 105 is in a fully retracted state, the lower piston conical sealing surface 300 fits tightly with the upper piston conical sealing surface 301 to avoid leakage of the annular cavity air from the ignition nozzle, thereby preventing the gas turbine output power from decreasing.

[0059] In this embodiment, the angle between the upper piston conical sealing surface 301 and the lower piston conical sealing surface 300 is 30°-60°, which is conducive to the disengagement of the piston 103 and the end cover 102d when the ignition rod 105 is extended.

[0060] The spring 202 is arranged between the piston 103 and the end cover 102d. One end of the spring 202 contacts the upper spring positioning groove 102e of the end cover 102d, and the other end contacts the lower spring positioning groove 102f of the piston 103, which is suitable for fixing the radial position of the spring 202 to ensure that the force of the spring 202 on the piston 103 is vertically downward, thereby preventing the labyrinth seal structure 201 from excessive contact with the cylinder housing 102 and wear.

[0061] The spring 202 is a compression spring, which is used to push the piston 103 toward the mounting flange 102a, so as to drive the ignition rod 105 connected to the piston 103 to return from the retracted state to the extended state to prepare for ignition.

[0062] When in the extended state, the spring 202 supports the piston 103 downward to balance the force of the annular cavity air acting on the lower end surface of the piston 103.

[0063] Design criteria for spring 202: The elastic force of spring 202 is slightly less than the pressure of the annular cavity air acting on the lower end surface of piston 103 after successful ignition, but greater than the pressure of the annular cavity air acting on the lower end surface of piston 103 during the purge process before engine ignition.

[0064] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0065] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0066] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0067] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A telescopic ignition nozzle with a detachable ignition rod, characterized in that: include, An ignition assembly (100) comprises a combustion engine cylinder body (101) and a flame tube (101a), a cylinder housing (102) mounted on the outer wall of the combustion engine cylinder body (101), a piston (103) being arranged inside the cylinder housing (102), an ignition rod (105) being arranged inside the piston (103), a connecting thread (104) being provided on the outer side of the ignition rod (105), the ignition rod (105) and the piston (103) being assembled by adjusting the connecting thread (104) to control the length of the ignition rod (105) extending out of the cylinder housing (102) to determine the ignition position, and the piston (103) fixing the ignition rod (105) by means of a lower locking plate (106) and an upper locking plate (106a); A retraction assembly (200) comprises a labyrinth seal structure (201) disposed outside a piston (103), the labyrinth seal structure (201) being arranged in an inclined manner in the direction of the combustion engine cylinder body (101), a spring (202) for applying an external force to the piston (103) being in contact with the top of the piston (103), and when ignition is successful, the piston (103) is driven by gas pressure to move the ignition rod (105) in a direction away from the combustion engine cylinder body (101); The lower piston conical sealing surface (300) is arranged on the top of the piston (103). When the piston (103) is moved in a direction away from the combustion engine cylinder body (101) by an external force, the lower piston conical sealing surface (300) is used to seal with the contact surface of the cylinder housing (102) to block the gas.

2. The telescopic ignition nozzle with a detachable ignition rod as claimed in claim 1, characterized in that: An annular air passage (a) is provided between the cylinder housing (102) and the flame tube (101a), and the annular air passage (a) is used to transport air into the flame tube (101a). A high-temperature fuel gas passage (b) is provided inside the flame tube (101a) for combustion reaction and transportation of combustion products.

3. The telescopic ignition nozzle with a detachable ignition rod as claimed in claim 2, characterized in that: A mounting flange (102a) is provided between the cylinder housing (102) and the combustion engine cylinder body (101); the mounting flange (102a) and the combustion engine cylinder body (101) are fixedly connected by bolts; and the mounting flange (102a) and the cylinder housing (102) are fixed by bolts.

4. The telescopic ignition nozzle with a detachable ignition rod as claimed in claim 1, characterized in that: The piston (103) divides the interior of the cylinder housing (102) into an upper chamber (102b) and a lower chamber (102c), and the volumes of the upper chamber (102b) and the lower chamber (102c) change with the movement of the piston (103).

5. The telescopic ignition nozzle with a detachable ignition rod as claimed in claim 4, characterized in that: An end cover (102d) is fixed to one end of the cylinder housing (102) away from the mounting flange (102a); an upper spring positioning groove (102e) for fixing the upper end of the spring (202) is formed on the end cover (102d); and a lower spring positioning groove (102f) for fixing the lower end of the spring (202) is formed on the piston (103).

6. The telescopic ignition nozzle with a detachable ignition rod as claimed in claim 5, characterized in that: The included angle between the labyrinth sealing structure (201) and the central axis of the ignition rod (105) is 45°-75°, the width-to-depth ratio of the labyrinth sealing structure (201) is 0.8-1, and the number of the labyrinth sealing structures (201) is 6-12; A support rib (103a) is fixed to the end surface of the piston (103) facing the mounting flange (102a), and the support rib (103a) is used to abut against the mounting flange (102a), so that a cavity is left between the mounting flange (102a) and the support rib (103a), so that the required gas can flow in to push the piston (103) to move.

7. The telescopic ignition nozzle with a detachable ignition rod as claimed in claim 3, characterized in that: The mounting flange (102a) and the combustion engine cylinder body (101) are respectively provided with a flange through hole (102g) and a combustion engine cylinder through hole (101b) for accommodating the ignition rod (105) to movably pass therethrough, the flange through hole (102g) and the combustion engine cylinder through hole (101b) have the same inner diameter, the flame cylinder (101a) is provided with a flame cylinder through hole (101c) for accommodating the ignition rod (105) to movably pass therethrough, and the inner diameter of the flame cylinder through hole (101c) is smaller than that of the combustion engine cylinder through hole (101b).

8. The telescopic ignition nozzle with a detachable ignition rod as claimed in claim 7, characterized in that: The ignition rod (105) is composed of an ignition positive electrode (105a) and an ignition rod shell (105b). The ignition positive electrode (105a) is located inside the ignition rod shell (105b). An insulating ceramic tube (105c) is fixedly arranged between the ignition positive electrode (105a) and the ignition rod shell (105b). A positive electrode contact (105d) is arranged at one end of the ignition positive electrode (105a) away from the flame tube (101a). An ignition cable fastening thread (105e) is provided at one end of the ignition rod shell (105b) away from the flame tube (101a).

9. The telescopic ignition nozzle with a detachable ignition rod as claimed in claim 8, characterized in that: Gaps are left between the flame tube through hole (101c) and the engine cylinder through hole (101b) and the ignition rod housing (105b). When the ignition rod (105) is successfully ignited, gas enters the cylinder housing (102) through the gap to push the piston (103) to move.

10. The telescopic ignition nozzle with a detachable ignition rod as claimed in claim 5, characterized in that: The end cover (102d) is provided with an upper piston conical sealing surface (301) that is butt-sealed with the lower piston conical sealing surface (300), and the end cover (102d) is provided with an end cover through hole (302) that accommodates the ignition rod housing (105b) to movably pass through.

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