Special detection device for armored exhaust thermocouple of marine medium-speed engine

Abstract

The invention discloses a special detection device for an armored exhaust thermocouple of a marine medium-speed engine, and relates to the technical field of accuracy detection of exhaust gas of each cylinder of the marine medium-speed engine and exhaust gas monitoring thermocouples at an inlet and an outlet of a turbine compressor. A temperature equalizing block is movably connected into an inner cavity of the corundum heating pipe, a sliding rod and an S-shaped temperature control thermocouple are fixed to the end, close to the temperature control end furnace mouth positioning block, of the temperature equalizing block, and an insertion hole and a positioning hole matched with a thermocouple of the marine medium-speed engine to be tested are formed in the end, away from the temperature control end furnace mouth positioning block, of the temperature equalizing block. And an S-shaped standard thermocouple is inserted into the inner cavity of the jack. According to the special detection device for the armored exhaust thermocouple of the marine medium-speed engine, the measurement value is reproduced through the standard platinum rhodium 10-platinum thermocouple, so that the accuracy of the measurement value in the manufacturing process is improved; one-time packaging completeness is kept, and additional measurement errors caused by physical displacement of the temperature sensing component are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of accuracy detection of thermocouples for exhaust gas monitoring at the inlets and outlets of each cylinder of a marine medium-speed engine and a turbo-compressor, and specifically relates to a special detection device for armored exhaust thermocouples of a marine medium-speed engine. Background Art

[0002] Marine diesel main and auxiliary engines belong to the branch of heat engines, internal combustion engines. In an ideal state, the compressed ignition mixture in the cylinder approximately adiabatically expands to push the reciprocating mechanism to cycle and do work. According to the thermal efficiency algorithm of the Carnot cycle in thermodynamics (η = 1 - T 2 / T 1 ), regarding the room temperature as the low heat source temperature (T 2 ), without exception, high-performance design solutions take increasing the detonation temperature of the fuel-air mixture (T 1 ) as one of the ways to improve the thermal efficiency of the engine. However, everything has two sides. Blindly increasing the combustion temperature will cause consequences such as overloading of the hot end sleeve and an increase in NOx by-products, and will also increase the ship's operation and maintenance costs, fuel consumption rate, and repair interval failure rate.

[0003] On the premise of limited increase in T 1 , if the exhaust gas at the end with a remaining temperature of 800K after the expansion work is completed in the cylinder is used as a vehicle by the compressor to inject more air into the combustion chamber, significant improvements can be achieved in indicators such as the engine's thermal efficiency, output power, and specific fuel consumption. A certain type of high-performance marine medium-speed diesel engine accurately measures the exhaust temperature of a single cylinder and the exhaust gas temperature at the inlets and outlets of the supercharger by arranging thermocouples in an array, collects thermal parameters such as the exhaust gas temperature of the fuel gas and turbine supercharging, and comprehensively adjusts related outputs such as fuel injection, supercharging, and intercooling by the centralized control system to optimize the balanced output state of the engine.

[0004] The armored exhaust thermocouple has the same temperature measurement principle as the national standard base metal thermocouple, but its special design makes it impossible to apply existing detection equipment for conventional detection: 1. The protection sleeve of the thermocouple is too short (80 - 150) mm, much lower than the depth of the general detection equipment; 2. The protection sleeve of the thermocouple is too thick (≥10 mm), and it cannot be bundled by conventional methods, affecting the detection effect; 3. There are multiple specifications of armored thermocouples, and multiple sets of special equipment are required. Summary of the Invention

[0005] The present invention provides a special detection device for armored exhaust thermocouples of a marine medium-speed engine, which solves the problem that the exhaust temperature thermocouple of a certain type of high-performance marine medium-speed diesel engine in the ship field cannot apply existing detection equipment due to its special design in the above-mentioned background art.

[0006] The present invention provides the following technical solutions: a special detection device for the armored exhaust thermocouple of a marine medium-speed engine, which designs a copper horizontal furnace core temperature equalizing block with a variable depth of a double-slider structure with a length of 80 mm. The position of the temperature equalizing block can be flexibly changed, so that this set of devices can meet the detection requirements of multiple types of thermocouples for a certain type of marine medium-speed engine; positioning holes are machined on the temperature equalizing block according to the outer diameter of the armored thermocouple of a certain type of marine medium-speed engine, so that the temperature equalizing block also has the function of fixing the armored thermocouple of the marine medium-speed engine, and the quantity value is reproduced by a standard platinum rhodium 10-platinum thermocouple to improve the accuracy of the quantity value in the manufacturing process.

[0007] A special detection device for the armored exhaust thermocouple of a marine medium-speed engine includes a housing. In the middle of the inner cavity of the housing, a corundum heating tube is fixed. A heating element winding is wound around the outer surface of the corundum heating tube. One end of the inner cavity of the corundum heating tube is clamped with a temperature control end furnace mouth positioning block. A temperature equalizing block is movably connected in the inner cavity of the corundum heating tube. On both sides of one end of the temperature equalizing block close to the temperature control end furnace mouth positioning block, sliding rods are fixed. The other end of the sliding rod extends to the outside of the housing. In the middle of one end of the temperature equalizing block close to the temperature control end furnace mouth positioning block, an S-type temperature control thermocouple is fixed. The other end of the S-type temperature control thermocouple extends to the outside of the housing, and both the sliding rod and the S-type temperature control thermocouple are movably connected with the temperature control end furnace mouth positioning block. In the middle of the end of the temperature equalizing block far from the temperature control end furnace mouth positioning block, there is a jack. An S-type standard thermocouple is inserted into the inner cavity of the jack. A circle of positioning holes adapted to the thermocouple of the marine medium-speed engine to be measured are evenly arranged on the outer ring of the end of the temperature equalizing block far from the temperature control end furnace mouth positioning block.

[0008] Preferably, through holes one adapted to the sliding rods are provided on both sides of the temperature control end furnace mouth positioning block, and through hole two adapted to the S-type temperature control thermocouple is provided in the middle of the temperature control end furnace mouth positioning block.

[0009] Preferably, a rubber sleeve is fixed at the end of the sliding rod far from the temperature equalizing block, and the outer diameter of the rubber sleeve is larger than the inner diameter of the through hole one.

[0010] Preferably, the positioning holes are circumferentially distributed on the temperature equalizing block, and the hole depth of the positioning holes is the same as the hole depth of the jack.

[0011] Preferably, a handle is fixed in the middle of the top of the housing.

[0012] Preferably, the space between the corundum heating tube and the housing is filled with a heat-insulating stuffing box.

[0013] Preferably, the S-type standard thermocouple is a standard platinum rhodium 10-platinum standard thermocouple.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The special detection device for the armored exhaust thermocouple of marine medium-speed engines can meet the detection requirements of multiple types of thermocouples for a certain type of marine medium-speed engine through the setting of the double-slider variable-depth copper horizontal furnace core temperature equalizing block structure, improving the applicability of the device. Moreover, the double-slider variable-depth copper horizontal furnace core temperature equalizing block structure also has the function of a fixed tooling, which can fix the S-type standard thermocouple and the thermocouple of the marine medium-speed engine to be detected, avoiding additional measurement errors caused by physical displacement of the temperature-sensing components.

[0016] 2. The special detection device for the armored exhaust thermocouple of marine medium-speed engines reproduces the quantity value through the standard platinum rhodium 10-platinum thermocouple, improving the accuracy of the quantity value in the manufacturing process; enhancing the detection efficiency of the armored exhaust temperature thermocouple of a certain type of medium-speed engine; maintaining the integrity of the one-time encapsulation and avoiding additional measurement errors caused by physical displacement of the temperature-sensing components. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of the structure of the present invention;

[0018] Figure 2 It is the structure of the present invention Figure 1 Left side view;

[0019] Figure 3 It is the structure of the present invention Figure 1 Internal view;

[0020] Figure 4 It is a schematic diagram of the double-slider variable-depth copper horizontal furnace core temperature equalizing block structure of the present invention;

[0021] Figure 5 It is the structure of the present invention Figure 4 Right side view;

[0022] Figure 6 It is a schematic diagram of the temperature control end furnace mouth positioning block of the present invention;

[0023] Figure 7 It is a schematic diagram of the detection data of the armored exhaust thermocouple of a certain type of marine medium-speed diesel engine with a length of (80 - 150) mm.

[0024] In the figure: 1. Outer shell; 2. Heat insulation stuffing box; 3. Heating element winding; 4. Positioning hole; 5. S-type temperature control thermocouple; 6. Temperature control end furnace mouth positioning block; 7. Temperature equalizing block; 8. Handle; 9. First through hole; 10. Corundum heating tube; 11. Slide bar; 12. S-type standard thermocouple; 13. Second through hole; 14. Rubber sleeve. DETAILED DESCRIPTION OF THE INVENTION

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] The present invention provides a special detection device for a marine medium-speed machine armored exhaust thermocouple, including a housing 1. A corundum heating tube 10 is fixed in the middle of the inner cavity of the housing 1. A heating element winding 3 is wound around the outer surface of the corundum heating tube 10. Through the setting of the heating element winding 3, a uniform and stable detection field can be provided; through the setting of the corundum heating tube 10, the functions of heat conduction, insulation and shaping the heating element winding 3 can be achieved.

[0027] The space between the corundum heating tube 10 and the housing 1 is filled with a heat-insulating stuffing box 2. Through the setting of the heat-insulating stuffing box 2, the heat loss of the detection device can be reduced.

[0028] A double-slider variable-depth copper horizontal furnace core temperature equalizing block structure is arranged in the inner cavity of the corundum heating tube 10. The double-slider variable-depth copper horizontal furnace core temperature equalizing block structure includes a temperature equalizing block 7. A positioning hole 4 adapted to the thermocouple of the marine medium-speed machine to be tested is evenly arranged on the outer circle at one end of the temperature equalizing block 7. The positioning holes 4 are circumferentially distributed on the temperature equalizing block 7. A jack is arranged in the middle of one end of the temperature equalizing block 7. An S-type standard thermocouple 12 is inserted into the inner cavity of the jack, and the hole depth of the positioning hole 4 is the same as the hole depth of the jack. The S-type standard thermocouple 12 is a standard platinum rhodium 10-platinum standard thermocouple. Through the setting of the S-type standard thermocouple 12, the quantity value can be reproduced by the standard platinum rhodium 10-platinum thermocouple, the accuracy of the quantity value in the manufacturing process can be improved, and the measuring ends of the thermocouple to be tested and the standard thermocouple can be ensured to be on the same radial plane by the method of prior measurement and marking.

[0029] An S-type temperature control thermocouple 5 is fixed in the middle of the other end of the temperature equalizing block 7. Slide rods 11 are fixed on both sides of the other end of the temperature equalizing block 7. A rubber sleeve 14 is fixed at the other end of the slide rod 11. Through the setting of the slide rod 11, the position of the temperature equalizing block 7 in the inner cavity of the corundum heating tube 10 can be adjusted, so that the device of the present application can meet the detection requirements of multiple types of thermocouples of a certain type of marine medium-speed machine.

[0030] In some embodiments of the present application, there are four positioning holes 4, and the positioning holes are processed according to the outer diameter of the armored thermocouple of a certain type of marine medium-speed machine; the length of the double-slider variable-depth copper horizontal furnace core temperature equalizing block structure is 80 mm.

[0031] From the above description of the structure of the double-slider variable-depth copper horizontal furnace core temperature equalizing block, it can be seen that the structure of the double-slider variable-depth copper horizontal furnace core temperature equalizing block has the function of a fixed tooling, which can fix the S-type standard thermocouple 12 and the marine medium-speed engine thermocouple to be detected, and avoid additional measurement errors caused by physical displacement of the temperature-sensing components.

[0032] One end of the inner cavity of the corundum heating tube 10 is clamped with a temperature control end furnace mouth positioning block 6, and a slide rod 11 is provided at one end of the temperature equalizing block 7 close to the temperature control end furnace mouth positioning block 6. Through holes one 9 adapted to the slide rod 11 are provided on both sides of the temperature control end furnace mouth positioning block 6. One end of the slide rod 11 away from the temperature equalizing block 7 extends to the outside of the housing 1 through the through hole one 9, and the slide rod 11 is movably connected to the inner cavity of the through hole one 9. The outer diameter of the rubber sleeve 14 is larger than the inner diameter of the through hole one 9. Through the setting of the rubber sleeve 14, the rubber sleeve 14 can position the slide rod 11 to prevent the temperature equalizing block 7 from separating from the temperature control end furnace mouth positioning block 6. In some embodiments of the present application, the outer diameter of the rubber sleeve 14 is twice the inner diameter of the through hole one 9. A through hole two 13 adapted to the S-type temperature control thermocouple 5 is provided in the middle of the temperature control end furnace mouth positioning block 6. One end of the S-type temperature control thermocouple 5 away from the temperature equalizing block 7 extends to the outside of the housing 1 through the through hole two 13, and the S-type temperature control thermocouple 5 is movably connected to the through hole two 13.

[0033] From the above description of the temperature control end furnace mouth positioning block 6, it can be seen that the temperature control end furnace mouth positioning block 6 can guide the slide rod and position the S-type temperature control thermocouple 5 to avoid additional measurement errors caused by physical displacement of the temperature-sensing components.

[0034] A handle 8 is fixed on the top of the housing 1.

[0035] In summary: When using the special detection device for the armored exhaust thermocouple of the marine medium-speed engine, the reference ends of the 4 armored exhaust thermocouples of a certain type of marine medium-speed engine to be detected and the S-type standard thermocouple 12 for reproducing the quantity value are respectively extended to the fully thermostated ice point dry well by using K-type thermocouple and S-type thermocouple compensating wires; after the reference ends are connected to the copper wires and led out to the multi-channel electrical scanning switch, the parasitic thermoelectric potential of the switch should meet the national standard; the copper leads used for the four thermocouples to be detected should come from the same wire hoop.

[0036] 2. Insert the 4 armored exhaust thermocouples to be detected into the four circumferentially distributed positioning holes 4 in sequence, pay attention to inserting them to the bottom of the counterbore without leaving gaps to ensure no convective heat exchange, and the welding points of the temperature measuring electrodes in the insulating sleeves of the 4 armored exhaust thermocouples are theoretically on the same radial plane. Push the temperature equalizing block 7 and the armored thermocouple to be detected towards the center of the heating furnace, with the low-temperature section positioning boss of the thermocouple to be detected as the limiting point.

[0037] 3. Insert the S-type standard thermocouple 12 for reproducing the measured value into the ceramic insulation sleeve and insert it along the jack of the isothermal block 7 until it reaches the core part of the isothermal block 7. Ensure that the measuring ends of the thermocouple under test and the standard thermocouple are on the same radial plane by means of pre-measurement and marking.

[0038] 4. Raise the furnace temperature to the test point through the temperature controller. When the sampling change rate of the S-type standard thermocouple 12 is less than 0.2 °C / min, start to read the electrical signals of the standard S-type thermocouple and each thermocouple under test for the armored exhaust temperature of the diesel engine at intervals and reciprocally; calculate the indication error by using the error calculation method for base metal thermocouples; collect the analog electrical signals of the standard S-type thermocouple and each thermocouple under test for the armored exhaust temperature of the diesel engine no less than 4 times.

[0039] 5. Perform accuracy detection on the armored exhaust thermocouple of a certain type of marine medium-speed diesel engine with a length of (80 - 150) mm according to the above procedures. The detection data is as shown in the appendix of the specification. Figure 7 As shown, the indication errors shown in the detection results are all within the range of ±4 °C, meeting the technical indicators of this type of armored exhaust thermocouple. This special detection device can meet the inspection and detection requirements for imported parts when they are put into storage.

[0040] All the standard parts used in the present invention can be purchased from the market. The special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machines, parts, and equipment all adopt conventional models in the prior art, which will not be elaborated here. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art. Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A special detection device for the armored exhaust thermocouple of marine medium-speed engines, including a housing (1). Characterized in that: In the middle of the inner cavity of the housing (1), a corundum heating tube (10) is fixed. A heating element winding (3) is wound around the outer surface of the corundum heating tube (10). At one end of the inner cavity of the corundum heating tube (10), a temperature control end furnace mouth positioning block (6) is clamped. A temperature equalizing block (7) is movably connected in the inner cavity of the corundum heating tube (10). On both sides of one end of the temperature equalizing block (7) close to the temperature control end furnace mouth positioning block (6), sliding rods (11) are fixed. The other ends of the sliding rods (11) extend to the outside of the housing (1). In the middle of one end of the temperature equalizing block (7) close to the temperature control end furnace mouth positioning block (6), an S-type temperature control thermocouple (5) is fixed. The other ends of the S-type temperature control thermocouples (5) all extend to the outside of the housing (1), and the sliding rods (11) and the S-type temperature control thermocouples (5) are both movably connected to the temperature control end furnace mouth positioning block (6). In the middle of one end of the temperature equalizing block (7) far from the temperature control end furnace mouth positioning block (6), there is a jack, and an S-type standard thermocouple (12) is inserted into the inner cavity of the jack. Around the outer circle of one end of the temperature equalizing block (7) far from the temperature control end furnace mouth positioning block (6), positioning holes (4) adapted to the thermocouple of the marine medium-speed engine to be tested are evenly arranged.

2. The special detection device for the armored exhaust thermocouple of marine medium-speed engines according to claim 1. Characterized in that: On both sides of the temperature control end furnace mouth positioning block (6), through holes one (9) adapted to the sliding rods (11) are provided. In the middle of the temperature control end furnace mouth positioning block (6), a through hole two (13) adapted to the S-type temperature control thermocouple (5) is provided.

3. The special detection device for the armored exhaust thermocouple of marine medium-speed engines according to claim 2. Characterized in that: A rubber sleeve (14) is fixed at the end of the sliding rod (11) far from the temperature equalizing block (7), and the outer diameter of the rubber sleeve (14) is larger than the inner diameter of the through hole one (9).

4. The special detection device for the armored exhaust thermocouple of marine medium-speed engines according to claim 1. Characterized in that: The positioning holes (4) are circumferentially distributed on the temperature equalizing block (7), and the hole depth of the positioning holes (4) is the same as the hole depth of the jack.

5. The special detection device for the armored exhaust thermocouple of marine medium-speed engines according to claim 1. Characterized in that: In the middle of the top of the housing (1), a handle (8) is fixed.

6. The special detection device for the armored exhaust thermocouple of marine medium-speed engines according to claim 1. Characterized in that: Between the corundum heating tube (10) and the housing (1), it is filled with a thermal insulation stuffing box (2).

7. The special detection device for the armored exhaust thermocouple of marine medium-speed engines according to claim 1. Characterized in that: The S-type standard thermocouple (12) is a standard platinum rhodium 10 - platinum standard thermocouple.

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