A face temperature measuring nozzle device

Abstract

The application provides an end face temperature measuring nozzle device, which comprises a nozzle body and a temperature measuring structure arranged in a temperature measuring cavity at the bottom of the nozzle; a top plate of the temperature measuring cavity is provided with fuel guide holes in a circumferential direction, and a wall is provided with corresponding fuel injection holes; a lower end surface of the temperature measuring structure is flush with an end surface of a nozzle nozzle, and an outer wall of the temperature measuring structure is matched with an inner wall of the temperature measuring cavity. The temperature measuring structure is arranged to be isolated from a fuel bin inside the nozzle nozzle, the temperature of the end surface of the nozzle can be measured, a thermocouple temperature measuring end is not affected by high-speed airflow inside and outside the fuel bin, and the temperature measuring structure is reliable in installation and not prone to falling off.

Description

Technical Field

[0001] This invention relates to the field of nozzle temperature measurement technology, and more specifically to an end-face temperature measuring nozzle device. Background Technology

[0002] In modern gas turbine burner design, the nozzle is one of the most important components and a core factor restricting the design level. Before conducting burner tests, nozzle tests are usually performed first to comprehensively understand the nozzle's various performance parameters. In nozzle or burner tests, the measurement of the nozzle wall temperature not only directly reflects the nozzle's thermal design level and whether its safety meets long-term service requirements, but also indirectly reveals whether backfire occurs during combustion and whether combustion is stable.

[0003] Existing patent number CN205138661U – Multi-temperature measuring nozzle – describes a nozzle connected to a continuous tube. A thermocouple is fixedly mounted on the nozzle, passing through the interior of the continuous tube. Multiple temperature measuring points are arranged along the length of the thermocouple within its armor. These multiple temperature measuring points include one located at the nozzle outlet end, which is fixed to a first pre-drilled hole in the nozzle body via a clamping device. The problem with this existing technology is that the thermocouple, directly fixed to the inner wall of the nozzle, is easily affected by high-speed airflow, resulting in low measurement accuracy and a high risk of thermocouple detachment. Summary of the Invention

[0004] To address the aforementioned problems of the prior art, this invention provides an end-face temperature measuring nozzle device. The nozzle device includes a nozzle body and a temperature measuring structure disposed within a temperature measuring chamber at the bottom of the nozzle. The top plate of the temperature measuring chamber has circumferentially distributed fuel guide holes, and the outer wall of the temperature measuring chamber has corresponding fuel injection holes. The lower end face of the temperature measuring structure is flush with the nozzle nozzle end face, and the outer wall of the temperature measuring structure mates with the inner wall of the temperature measuring chamber. The temperature measuring structure is disposed at the bottom of the nozzle and isolated from the fuel tank inside the nozzle.

[0005] Preferably, the temperature measuring structure has a thermocouple chamber inside, where the thermocouple measuring end is fixed. The thermocouple can be directly welded or fixed inside the temperature measuring structure using a pressure plate, allowing it to be installed in conjunction with nozzles of various structural forms, increasing the compatibility and reusability of this end-face temperature measuring structure.

[0006] Preferably, the nozzle body contains a fuel chamber, and the top of the fuel chamber has a central hole that connects to the fuel pipeline. The fuel chamber separates the fuel flow channel from the temperature measuring structure. Fuel flows in from the central hole at the top of the fuel chamber and flows out from the fuel guide hole at the bottom, maintaining the main flow direction and minimizing pressure loss due to fuel flow rate.

[0007] Preferably, an annular guide vane is connected to the outer wall of the nozzle body, and the annular guide vane and the outer wall of the fuel tank form an upward-opening annular air cavity. The guide vane connected to the outer wall of the nozzle body provides auxiliary air intake to the bottom of the nozzle. The annular guide vane ensures uniform circumferential air intake at the bottom of the nozzle.

[0008] Preferably, the bottom of the annular air chamber is provided with circumferentially distributed air holes. The air holes are arc-shaped and are close to the outer wall of the fuel tank. The positions of the air holes correspond to the fuel injection holes. The airflow outlet of the air holes is located at the fuel injection port outlet. The airflow directly affects the fuel injection. The arc shape of the air holes reduces the pressure loss of the airflow velocity.

[0009] Preferably, the nozzle bottom diameter and the fuel tank outer wall diameter are matched. The nozzle bottom diameter affects the fuel injection position at the fuel injection orifice. The fuel tank outer wall diameter affects the air orifice position. Only when the two are matched can the airflow at the air orifice directly affect the fuel injection orifice to achieve the maximum effect.

[0010] Preferably, thermocouple lead-out holes are provided on the thermocouple chamber wall and the nozzle body. The thermocouple chamber section of the lead-out hole is flush with the bottom surface of the thermocouple chamber, and the nozzle body section of the lead-out hole is located in the gap between the fuel injection hole and the fuel guide hole. The thermocouple lead-out hole ensures normal operation of the thermocouple, and its location in the connection gap prevents high-speed airflow from eroding the thermocouple, preventing it from falling off and ensuring measurement accuracy. When leading out the thermocouple, it is led out through the partition between the two air holes to the outer wall of the annular guide plate and connected to the compensating wire, without affecting the mainstream flow. The thermocouple is not bent at a large angle during lead-out, ensuring its temperature measurement performance.

[0011] Preferably, the bottom surface of the thermocouple chamber is provided with a thermocouple lead-out hole, which is an angled hole. The nozzle body does not require a thermocouple lead-out hole.

[0012] Preferably, the temperature measuring structure and the nozzle body are made of the same material. The temperature measuring structure and the nozzle body have the same thermal conductivity, reducing temperature measurement errors caused by heat transfer.

[0013] This invention offers the following advantages: the thermocouple's measuring end is fixed within the temperature-sensing structure, allowing for precise acquisition of the wall temperature at the measurement location; since there is virtually no airflow at the temperature-sensing base plate, the thermocouple is securely installed; and because the temperature-sensing component and the nozzle body are made of the same processing material, the wall temperature of the temperature-sensing base plate directly reflects the nozzle's wall temperature, resulting in high measurement accuracy. Furthermore, because the outer wall of the temperature-sensing structure and the inner wall of the nozzle's temperature-sensing chamber are joined through an assembly relationship, disassembly is convenient, and it can be compatible with nozzles of various structural forms, increasing the compatibility and reusability of the temperature-sensing structure. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention;

[0015] Figure 2 This is a cross-sectional view of the nozzle of the present invention;

[0016] Figure 3 This is a cross-sectional view of the combustion injection hole of the present invention;

[0017] Figure 4 This is a schematic diagram of the temperature measuring structure according to an embodiment of the present invention;

[0018] Figure 5 This is a schematic diagram of the temperature measuring structure according to an embodiment of the present invention;

[0019] 1. Nozzle body; 2. Temperature measuring structure; 3. Thermocouple;

[0020] 11. First threaded hole; 12. Baffle plate; 13. Second threaded hole; 14. Fuel guide hole; 15. Fuel injection hole; 16. Thermocouple lead-out hole; 17. Temperature measuring chamber; 18. Air hole; 19. Fuel tank;

[0021] 22. Thermocouple chamber; 23. Third threaded hole. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are merely some embodiments of the present invention, and not all embodiments.

[0023] like Figure 1 As shown, an end-face temperature measuring nozzle device includes a nozzle body 1 and a temperature measuring structure 2 disposed within a temperature measuring cavity 17 at the bottom of the nozzle. The top plate of the temperature measuring cavity has circumferentially distributed fuel guide holes 14, and the wall has corresponding fuel injection holes 15. The lower end face of the temperature measuring structure is flush with the nozzle orifice end face, and the outer wall of the temperature measuring structure mates with the inner wall of the temperature measuring cavity. The temperature measuring structure is positioned at the nozzle orifice, isolated from the fuel chamber 19 inside the nozzle. The temperature measuring structure does not interfere with the fuel flow path and has no impact on fuel flow. Simultaneously, it is positioned as close as possible to the wall surface at the temperature measuring location to accurately measure the wall surface temperature.

[0024] The temperature measuring structure 2 has a thermocouple chamber 22 inside, where the thermocouple measuring end is fixed. Thermocouple 3 is directly welded into the temperature measuring structure, allowing it to be installed in conjunction with nozzles of various structures, increasing the compatibility of this end-face temperature measuring structure. Because the temperature measuring structure is located on the nozzle orifice end face, there is almost no air flow inside the thermocouple chamber, resulting in stable thermocouple installation and accurate temperature measurement results.

[0025] like Figure 2As shown, the nozzle body 1 contains a fuel chamber 19, and the top of the fuel chamber 19 has a central hole that connects to the fuel pipeline. The fuel chamber separates the fuel flow channel from the temperature measuring structure. Fuel flows in from the central hole at the top of the fuel chamber and flows out from the fuel guide hole at the bottom, with the main flow direction remaining unchanged. The first threaded hole 11 on the nozzle body connects to the fuel pipeline, allowing for nozzle model replacement. A gasket is provided between the fuel pipeline and the nozzle body to ensure end-face sealing.

[0026] An annular guide plate 12 is connected to the outer wall of the nozzle body. The annular guide plate and the outer wall of the fuel tank form an annular air cavity with an upward opening. The guide plate connected to the outer wall of the nozzle body provides auxiliary air intake to the bottom of the nozzle. The annular guide plate ensures uniform circumferential air intake at the bottom of the nozzle, guaranteeing that the air intake volume at each fuel injection hole is basically consistent.

[0027] The bottom of the annular air chamber is provided with circumferentially distributed air holes 18. These air holes are arc-shaped and are flush with the outer wall of the fuel tank. Their positions correspond to the fuel injection holes 15. The fuel injection holes and fuel guide holes are arranged uniformly and in a one-to-one correspondence. The airflow outlet of the air holes is located at the fuel injection port outlet. The airflow directly affects fuel ejection. The arc-shaped shape of the air holes reduces pressure loss on the airflow velocity, ensuring that the flow rate of each fuel injection hole is essentially consistent.

[0028] The nozzle bottom diameter matches the outer wall diameter of the fuel tank 19. The nozzle bottom diameter affects the fuel injection position of the fuel injection hole 15. The outer wall of the fuel tank should be an arc-shaped air hole sidewall so that the gas at the air hole directly acts on the fuel injection hole outlet, thus maximizing the direct impact of the airflow at the air hole 18 on the fuel injection hole.

[0029] Example 1

[0030] like Figure 1 , Figure 3 and Figure 4 As shown, thermocouple lead-out holes 16 are provided on the thermocouple chamber wall and nozzle body within the temperature measuring structure. The thermocouple chamber section of the lead-out hole is flush with the bottom surface of the thermocouple chamber, and the nozzle body section of the lead-out hole is located in the gap between different fuel injection holes and fuel guide holes. The thermocouple lead-out holes 16 ensure normal operation of the thermocouple, are located in the connection gap, do not interfere with the fuel flow path, prevent high-speed airflow from scouring the thermocouple 22, prevent the thermocouple 22 from falling off, and ensure the accuracy of thermocouple measurement. Simultaneously, they have no impact on fuel flow. When leading out the thermocouple, it is led out through the partition between the two air holes to the outer wall of the annular guide plate and connected to the compensating wire, without affecting the mainstream airflow. The thermocouple is not bent at a large angle during lead-out, ensuring its temperature measuring performance.

[0031] Example 2

[0032] like Figure 2 and 5 As shown, an end-face temperature measuring nozzle device includes a nozzle body 1 and a temperature measuring structure 2 disposed in a temperature measuring cavity 17 at the bottom of the nozzle; the top plate of the temperature measuring cavity is provided with circumferentially distributed fuel guide holes 14, and the wall is provided with corresponding fuel injection holes 15; the lower end face of the temperature measuring structure is flush with the bottom of the nozzle, and the outer wall of the temperature measuring structure is matched with the inner wall of the temperature measuring cavity.

[0033] like Figure 5 As shown, the bottom surface of the thermocouple chamber 22 within the temperature measuring structure 2 is provided with a thermocouple lead-out hole 16, which is an angled hole. No thermocouple lead-out hole is required on the nozzle body. The thermocouple measuring end is placed and fixed within the thermocouple chamber of the temperature measuring structure through the angled hole. The thermocouple is led out through the partition between the bottom of the nozzle and the two air holes to the outer wall of the annular guide plate and connected to the compensating wire, avoiding the need for drilling into the nozzle body.

[0034] The temperature measuring structure and the nozzle body are made of the same processing materials. The temperature measuring structure and the nozzle body have the same thermal conductivity, and the wall temperature of the temperature measuring structure can directly reflect the temperature of the inner wall of the nozzle, reducing the temperature measurement error caused by heat transfer.

[0035] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A face-mounted temperature measuring nozzle device, characterized in that, The nozzle device includes a nozzle body (1) and a temperature measuring structure (2) located in the temperature measuring chamber (17) at the bottom of the nozzle. The top plate of the temperature measuring chamber is provided with circumferentially distributed fuel guide holes (14), and the outer wall of the temperature measuring chamber is provided with corresponding fuel injection holes (15). The lower end face of the temperature measuring structure is flush with the nozzle orifice end face, and the outer wall of the temperature measuring structure fits into the inner wall of the temperature measuring cavity.

2. The end-face temperature measuring nozzle device according to claim 1, characterized in that, The temperature measuring structure has a thermocouple chamber (22) inside, and the thermocouple (3) temperature measuring end is fixed inside the thermocouple chamber.

3. The end-face temperature measuring nozzle device according to claim 1, characterized in that, The nozzle body is provided with a fuel chamber (19), and the top of the fuel chamber is provided with a central hole connected to the fuel pipeline.

4. The end-face temperature measuring nozzle device according to claim 3, characterized in that, The outer wall of the nozzle body is connected to an annular guide plate (12), and the annular guide plate and the outer wall of the fuel tank form an annular air cavity with the opening facing upward.

5. The end-face temperature measuring nozzle device according to claim 4, characterized in that, The bottom of the annular air cavity on the outer wall of the nozzle body is provided with circumferentially distributed air holes (18). The air holes are arc-shaped and are close to the outer wall of the fuel tank. The position of the air holes corresponds to the fuel injection holes.

6. The end-face temperature measuring nozzle device according to claim 1, characterized in that, The diameter of the nozzle bottom matches the diameter of the outer wall of the fuel tank.

7. The end-face temperature measuring nozzle device according to claim 2, characterized in that, Thermocouple lead-out holes (16) are provided on the thermocouple chamber wall and the nozzle body within the temperature measuring structure. The thermocouple chamber section of the thermocouple lead-out hole is flush with the bottom surface of the thermocouple chamber, and the nozzle body section of the thermocouple lead-out hole is located in the gap between different fuel injection holes and fuel guide holes.

8. The end-face temperature measuring nozzle device according to claim 2, characterized in that, The thermocouple chamber in the temperature measuring structure is provided with a thermocouple lead-out hole (16) on the bottom surface, and the thermocouple lead-out hole is an oblique hole.

9. A face temperature measuring nozzle device according to any one of claims 1 to 8, characterized in that, The temperature measuring structure and the nozzle body are made of the same material.

Images