Diesel engine explosion pressure and compression pressure testing device

Abstract

The utility model provides a diesel engine explosion pressure and compression pressure testing device, which belongs to the technical field of diesel engines and comprises a heat conduction seat and a pressure sensor. An air inlet channel, an expansion channel communicated with the air inlet channel and a communication channel communicated with the expansion channel are arranged in the heat conduction seat; the aperture of the expansion channel is larger than the aperture of the air inlet channel and the aperture of the communication channel so as to increase the contact area of gas exhausted by the air cylinder and the heat conduction base. The pressure sensor is connected with the heat conducting seat, and the communication channel is communicated with the pressure sensor; the air inlet channel communicates with the air cylinder. According to the utility model, more heat in the gas exhausted by the cylinder of the diesel engine can be dissipated through the heat conducting seat and the expansion channel, and the exhaust temperature is reduced, so that the distortion of the pressure sensor is avoided, and the accuracy of the pressure value detected by the pressure sensor is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of diesel engines, and relates to a test technology of explosion pressure and compression pressure of a diesel engine, in particular to a test device for explosion pressure and compression pressure of a diesel engine. Background Art

[0002] The diesel engine is the core power source for internal combustion locomotives, generating power by burning diesel fuel. Due to its high efficiency, durability, and economy, the diesel engine has become the mainstream power source of choice for internal combustion locomotives. The diesel engine operates by burning fuel (diesel) in the presence of oxygen, generating high-temperature, high-pressure gas that drives the piston, thereby converting it into mechanical energy.

[0003] A diesel engine's compression and burst pressures are key indicators of its combustion efficiency and power output. Compression pressure refers to the maximum pressure reached by the gas in the cylinder at the end of the compression stroke; burst pressure refers to the pressure in the cylinder near top dead center (TDC) as the piston compresses the air in the cylinder during the compression stroke. Testing compression and burst pressures can be used to assess the quality of diesel engines after inspection and maintenance, and can also be used for diesel engine fault diagnosis to ensure safe operation of diesel locomotives.

[0004] In the existing technology, the compression pressure and explosion pressure of the diesel engine are directly detected by pressure sensors. However, the temperature of the gas directly discharged from the diesel engine cylinder is high (the exhaust temperature of the diesel engine is usually between 200-600℃), which can easily cause the data detected by the pressure sensor to be distorted, resulting in inaccurate detection results. Utility Model Content

[0005] In view of the technical problem described in the above background technology that the high exhaust temperature of existing diesel engines easily leads to data distortion detected by pressure sensors, the present utility model proposes a diesel engine explosion pressure and compression pressure testing device to address this technical problem.

[0006] The utility model provides a heat-conducting seat and opens an expansion channel with a larger aperture than the air intake channel and the connecting channel in the heat-conducting seat, so as to increase the contact area between the gas discharged from the cylinder and the heat-conducting seat, thereby increasing the heat conduction effect of the heat-conducting seat. More heat in the gas discharged from the cylinder of the diesel engine can be dissipated through the heat-conducting seat and the expansion channel, thereby reducing the exhaust temperature, thereby avoiding distortion of the pressure sensor and improving the accuracy of the pressure value detected by it.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A diesel engine explosion pressure and compression pressure testing device, comprising:

[0009] A heat-conducting seat, wherein the heat-conducting seat is provided with an air intake channel, an expansion channel communicating with the air intake channel, and a connecting channel communicating with the expansion channel. The aperture of the expansion channel is larger than the apertures of the air intake channel and the connecting channel to increase the contact area between the gas discharged from the cylinder and the heat-conducting seat;

[0010] and a pressure sensor, wherein the pressure sensor is connected to the heat-conducting seat, and the communication channel is connected to the pressure sensor;

[0011] The air intake passage is communicated with a cylinder, and the cylinder refers to a cylinder of a diesel engine.

[0012] It is further defined that a test channel is also provided on the thermal base, and the test channel is used to connect the pressure sensor and the communication channel.

[0013] It is further defined that the thermal seat includes a first thermal seat, a second thermal seat and a thermal seat head, the thermal seat head, the first thermal seat and the second thermal seat are arranged as a whole from front to back along the flow direction of the gas, the air inlet channel is located in the thermal seat head, the expansion channel is located in the first thermal seat, and the connecting channel is located in the second thermal seat.

[0014] It is further defined that a plurality of first heat dissipation fins are distributed axially on the outer side of the first heat conducting seat, and a plurality of second heat dissipation fins are distributed axially on the outer side of the second heat conducting seat.

[0015] It is further defined that the first heat-conducting seat and the first heat-dissipating fin are integrally provided, and the second heat-conducting seat and the second heat-dissipating fin are integrally provided.

[0016] It is further defined that the diesel engine explosion pressure and compression pressure testing device further includes a connecting sleeve, the connecting sleeve being located at the head of the heat conducting seat and being arranged near the intake end of the intake passage, the connecting sleeve being used to connect the intake passage with the output pipe of the cylinder;

[0017] The outer side of the connecting sleeve is provided with a plurality of operating holes distributed along the circumferential direction.

[0018] It is further defined that the diesel engine explosion pressure and compression pressure testing device also includes a pressure relief valve, the pressure relief valve is connected to the heat conductive seat, and the communication channel is connected to the pressure relief valve.

[0019] It is further defined that a pressure relief channel is also provided on the heat conducting seat, and the pressure relief channel is used to connect the pressure relief valve and the communication channel.

[0020] It is further defined that a sensor protection cover is provided on the outer side of the pressure sensor, and the sensor protection cover is clamped with the thermal seat.

[0021] It is further defined that the aperture of the air intake channel is the same as the aperture of the connecting channel, and the aperture ratio of the air intake channel to the aperture of the expansion channel is 1:(1.5-2.5).

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] 1. The present invention provides a diesel engine explosion pressure and compression pressure test device. The device comprises a heat-conducting seat and an expansion channel with a larger aperture than the intake channel and the connecting channel. This increases the contact area between the cylinder exhaust gas and the heat-conducting seat, thereby enhancing the heat conduction effect of the heat-conducting seat. By providing the heat-conducting seat and the expansion channel, more heat can be dissipated from the cylinder exhaust gas of the diesel engine, reducing the exhaust temperature, thereby avoiding distortion of the pressure sensor and improving the accuracy of the detected pressure value.

[0024] 2. The utility model integrates the first heat-conducting seat, the second heat-conducting seat and the heat-conducting seat head, so that the gas channel (air inlet channel, expansion channel and connecting channel) in the heat-conducting seat is integrated, ensuring the integrity of the gas channel, avoiding gas leakage during the flow process, resulting in inaccurate pressure measurement, and improving the accuracy of data measurement.

[0025] 3. The utility model has a plurality of first heat dissipation fins distributed axially on the outside of the first heat-conducting seat, and a plurality of second heat dissipation fins distributed axially on the outside of the second heat-conducting seat. The first heat dissipation fins and the second heat dissipation fins increase the contact area between the heat-conducting seat and the air, thereby improving the heat dissipation effect.

[0026] 4. The utility model sets a connecting sleeve on the head of the heat conducting seat to facilitate the connection operation between the connecting channel and the output pipe of the cylinder. There are multiple operating holes distributed along the circumference of the outer side of the connecting sleeve. The operating holes are the plug-in interfaces for operating tools during connection, which is convenient for operators to operate.

[0027] 5. The diesel engine explosion pressure and compression pressure testing device of the present invention also includes a pressure relief valve, which is used to relieve pressure during inspection or maintenance to avoid burns to operators caused by high-temperature and high-pressure gas during the testing process, thereby ensuring safety.

[0028] 6. The utility model provides a sensor protection cover on the outside of the pressure sensor to protect the pressure sensor.

[0029] 7. The diesel engine explosion pressure and compression pressure testing device of the present invention integrates the pressure relief valve, pressure sensor and heat dissipation structure on the heat-conducting seat in an integrated manner. It has a small size, reduces space occupancy, is lightweight and portable, is easy to carry and install for measurement, and reduces the intensity of test operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The overall structure of the utility model diesel engine explosion pressure and compression pressure test device is shown in FIG. Figure 1 ;

[0031] Figure 2 This is a cross-sectional view of the explosion pressure and compression pressure testing device for a diesel engine according to the present invention;

[0032] Figure 3 The overall structure of the utility model diesel engine explosion pressure and compression pressure test device is shown in FIG. Figure 2 ;

[0033] Description of reference numerals:

[0034] 1-connecting sleeve, 101-operating hole, 2-first thermal seat, 201-first heat dissipation fin, 3-second thermal seat, 301-second heat dissipation fin, 4-pressure relief valve, 5-pressure sensor, 6-sensor protective cover, 7-thermal seat head, 8-air inlet channel, 9-capacity expansion channel, 10-connecting channel, 11-pressure relief channel, 12-test channel. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be further explained below with reference to the accompanying drawings and embodiments, but the present invention is not limited to the embodiments described below.

[0036] See also Figure 2 The present invention proposes a diesel engine explosion pressure and compression pressure test device, including: a thermal conductive seat and a pressure sensor 5, an intake channel 8, an expansion channel 9 connected to the intake channel 8, and a connecting channel 10 connected to the expansion channel 9 are provided in the thermal conductive seat, the aperture of the expansion channel 9 is larger than the aperture of the intake channel 8 and the aperture of the connecting channel 10, so as to increase the contact area between the gas discharged from the cylinder and the thermal conductive seat; the pressure sensor 5 is connected to the thermal conductive seat, and the connecting channel 10 is connected to the pressure sensor 5; the intake channel 8 is connected to the cylinder, and the cylinder refers to the cylinder of the diesel engine. The pressure sensor 5 and the thermal conductive seat in the present invention are fixedly connected, and the fixed connection method can be a snap connection, a screw connection, or other connection methods known to those skilled in the art. A copper pad is provided between the pressure sensor 5 and the thermal conductive seat for sealing.

[0037] Preferably, the pressure sensor 5 in the present invention is a piezoelectric pressure sensor. In addition, it can also be other pressure sensors known to those skilled in the art.

[0038] In the present invention, the volume of the expansion channel 9 is proportional to the volume of the cylinder so that the two match. Preferably, the volume ratio of the expansion channel 9 to the cylinder is 0.03:1.

[0039] In the present invention, a test channel 12 is further provided on the heat conducting base, and the test channel 12 is used to connect the pressure sensor 5 and the communication channel 10 .

[0040] See also Figure 1 and Figure 3 In the present invention, the thermal base includes a first thermal base 2, a second thermal base 3, and a thermal base head 7. The thermal base head 7, first thermal base 2, and second thermal base 3 are integrally arranged from front to back along the gas flow direction. The air inlet channel 8 is located in the thermal base head 7, the expansion channel 9 is located in the first thermal base 2, and the communication channel 10 is located in the second thermal base 3. Specifically, the first thermal base 2 is a cylindrical structure with no corners, which allows for better heat exchange with the atmosphere and dissipates more heat. The second thermal base 3 is a rectangular parallelepiped structure, which facilitates the installation of the pressure sensor 5 and the pressure relief valve 4.

[0041] A plurality of first heat dissipation fins 201 are axially distributed on the outer side of the first heat conducting base 2, and a plurality of second heat dissipation fins 301 are axially distributed on the outer side of the second heat conducting base 3. The first heat dissipation fins 201 and the second heat dissipation fins 301 increase the contact area between the heat conducting base and the air, thereby improving the heat dissipation effect.

[0042] The first heat conducting seat 2 and the first heat dissipating fins 201 are integrally provided, and the second heat conducting seat 3 and the second heat dissipating fins 301 are integrally provided.

[0043] The diesel engine explosion pressure and compression pressure test device also includes a connecting sleeve 1, which is located on the heat-conducting seat head 7 and is arranged near the intake end of the intake channel 8. The connecting sleeve 1 is used to connect the intake channel 8 with the output pipe of the cylinder; a plurality of operating holes 101 are distributed circumferentially on the outer side of the connecting sleeve 1. The connecting sleeve 1 is movably connected to the heat-conducting seat head 7, that is, the connecting sleeve 1 can rotate around the heat-conducting seat head 7. Preferably, a sealing ridge is provided on the connecting sleeve 1 and the heat-conducting seat head 7 to seal the gap between the connecting sleeve 1 and the heat-conducting seat head 7. The operating hole 101 is an insertion interface for operating tools during connection, which facilitates the operator to perform connection operations.

[0044] In the present invention, a thread is provided on the side of the connecting sleeve 1 close to the output pipe of the cylinder, and the connecting sleeve 1 is threadedly connected to the output pipe of the cylinder. In addition, it can also be other connection methods known to those skilled in the art.

[0045] In the present invention, the diesel engine explosion pressure and compression pressure testing device also includes a pressure relief valve 4, which is connected to the thermal seat, and the connecting channel 10 is connected to the pressure relief valve 4. The pressure relief valve 4 and the thermal seat in the present invention are fixedly connected, and the fixed connection method can be a snap connection, a screw connection, or other connection methods familiar to those skilled in the art. A copper gasket is provided between the pressure relief valve 4 and the thermal seat for sealing. The pressure relief valve 4 is used to relieve pressure during inspection or maintenance to avoid burns to the operator caused by high-temperature and high-pressure gas during the detection process, thereby ensuring safety.

[0046] In the present invention, a pressure relief channel 11 is further provided on the heat conducting seat, and the pressure relief channel 11 is used to connect the pressure relief valve 4 and the communication channel 10 .

[0047] In the present utility model, the pressure relief valve 4 is located on the upper end surface of the second thermal conductive seat 3; the pressure sensor 5 is located on the lower end surface of the second thermal conductive seat 3; the first thermal conductive seat 2 is located on one side of the second thermal conductive seat 3; the test channel 12 and the pressure relief channel 11 are both located in the second thermal conductive seat 3, and the test channel 12 extends downward to communicate with the pressure sensor 5, and the pressure relief channel 11 extends upward to communicate with the pressure relief valve 4.

[0048] A sensor shield 6 is provided outside the pressure sensor 5 and is engaged with the heat conducting seat. Specifically, a limiting boss is provided on the second heat conducting seat 3 and the sensor shield 6 is engaged with the second heat conducting seat 3 by being clamped on the limiting boss.

[0049] The aperture of the intake channel 8 is the same as that of the connecting channel 10, and the ratio of the aperture of the intake channel 8 to the aperture of the expansion channel 9 is (1:1.5-2.5). Specifically, the aperture of the intake channel 8 and the aperture of the connecting channel 10 can both be 3mm, 4mm, or 5mm. When the aperture of the intake channel 8 is 4mm, the aperture of the expansion channel 9 can be 6mm, 8mm, or 10mm. Specifically, the apertures of the intake channel 8, the expansion channel 9, and the connecting channel 10 are all very small, and are all on the millimeter level. Slightly increasing the aperture to form the expansion channel 9 will not affect the measurement value of the pressure sensor 5.

[0050] In the present invention, preferably, the aperture of the air inlet channel 8 is 4 mm, and the aperture of the expansion channel 9 is 8 mm.

[0051] The present invention provides a diesel engine explosion pressure and compression pressure testing device. Its operating principle is as follows: During diesel engine operation, the explosion pressure and compression pressure of the cylinder can be tested in real time. Specifically, the compression pressure is tested at the end of the compression stroke; the explosion pressure is tested when the piston reaches near compression top dead center during the compression stroke. Simultaneously, the heat from the gas discharged from the cylinder is continuously dissipated through the cooperation of the heat conducting seat, the first heat sink 201, the second heat sink 301, and the expansion channel 9, thereby reducing the exhaust temperature and preventing distortion of the pressure sensor 5, thereby improving the accuracy of the pressure value detected by the pressure sensor.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A diesel engine explosion pressure and compression pressure testing device, characterized in that: include: A heat-conducting seat, wherein an air intake channel (8), an expansion channel (9) communicating with the air intake channel (8), and a connecting channel (10) communicating with the expansion channel (9) are provided in the heat-conducting seat, wherein the aperture of the expansion channel (9) is larger than the apertures of the air intake channel (8) and the connecting channel (10), so as to increase the contact area between the gas discharged from the cylinder and the heat-conducting seat; and a pressure sensor (5), the pressure sensor (5) being connected to the heat-conducting seat, and the communication channel (10) being in communication with the pressure sensor (5); The air intake passage (8) is in communication with a cylinder, and the cylinder refers to a cylinder of a diesel engine.

2. The diesel engine explosion pressure and compression pressure testing device according to claim 1, characterized in that: A test channel (12) is also provided on the heat-conducting seat, and the test channel (12) is used to connect the pressure sensor (5) and the communication channel (10).

3. The diesel engine explosion pressure and compression pressure testing device according to claim 1, characterized in that: The heat-conducting seat comprises a first heat-conducting seat (2), a second heat-conducting seat (3) and a heat-conducting seat head (7); the heat-conducting seat head (7), the first heat-conducting seat (2) and the second heat-conducting seat (3) are integrally arranged from front to back along the flow direction of the gas; the air inlet channel (8) is located in the heat-conducting seat head (7); the expansion channel (9) is located in the first heat-conducting seat (2); and the connecting channel (10) is located in the second heat-conducting seat (3).

4. The diesel engine explosion pressure and compression pressure testing device according to claim 3, characterized in that: A plurality of first heat dissipation fins (201) are distributed axially on the outer side of the first heat-conducting seat (2), and a plurality of second heat dissipation fins (301) are distributed axially on the outer side of the second heat-conducting seat (3).

5. The diesel engine explosion pressure and compression pressure testing device according to claim 4, characterized in that: The first heat-conducting seat (2) and the first heat-dissipating fin (201) are integrally arranged, and the second heat-conducting seat (3) and the second heat-dissipating fin (301) are integrally arranged.

6. The diesel engine explosion pressure and compression pressure testing device according to claim 3, characterized in that: The diesel engine explosion pressure and compression pressure test device further comprises a connecting sleeve (1), the connecting sleeve (1) being located at the heat-conducting seat head (7) and being arranged close to the intake end of the intake channel (8), the connecting sleeve (1) being used to connect the intake channel (8) with the output pipe of the cylinder; The outer side of the connecting sleeve (1) is provided with a plurality of operating holes (101) distributed along the circumferential direction.

7. The diesel engine explosion pressure and compression pressure testing device according to claim 1, characterized in that: The diesel engine explosion pressure and compression pressure testing device further comprises a pressure relief valve (4), the pressure relief valve (4) is connected to the heat conducting seat, and the communication channel (10) is in communication with the pressure relief valve (4).

8. The diesel engine explosion pressure and compression pressure testing device according to claim 7, characterized in that: A pressure relief channel (11) is also provided on the heat-conducting seat, and the pressure relief channel (11) is used to connect the pressure relief valve (4) and the communication channel (10).

9. The diesel engine explosion pressure and compression pressure testing device according to claim 1, characterized in that: A sensor protection cover (6) is provided on the outside of the pressure sensor (5), and the sensor protection cover (6) is clamped to the heat conducting seat.

10. The diesel engine explosion pressure and compression pressure testing device according to claim 1, characterized in that: The aperture of the air intake channel (8) is the same as the aperture of the communication channel (10), and the aperture ratio of the air intake channel (8) to the expansion channel (9) is 1:(1.5-2.5).

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