High-pressure sealing connection device used in high-pressure common rail oil pump test

Abstract

The utility model discloses a high-pressure sealing connection device used in a high-pressure common-rail oil pump test, which comprises a high-pressure common-rail pump and a high-pressure common-rail pipe, a connection assembly is arranged between the high-pressure common-rail pump and the high-pressure common-rail pipe, and the connection assembly can be used for high-pressure sealing connection in the high-pressure common-rail oil pump test. A high-pressure common-rail pump and a high-pressure common-rail pipe are connected through a conical surface adapter and a positive and negative tooth adapter nut, pre-tightening and dismounting are conducted in a test through the positive and negative tooth adapter nut, and the conical surface of the conical surface adapter is tightly connected with the conical surface of an oil outlet of the tested high-pressure pump during pre-tightening; high-pressure sealing is carried out by combining small deformation of a conical surface, residual pressure in a high-pressure rail pipe is released through a safety pressure relief opening in the positive and negative tooth adapter nut during disassembly, the functions of protecting an operator and preventing oil from splashing are achieved, and the testing efficiency and safety are improved.

Description

Technical Field

[0001] The utility model relates to the field of diesel engine high-pressure common rail fuel pumps, and specifically to a high-pressure sealing connection device for high-pressure common rail fuel pump testing. Background Technique

[0002] Adopting a high-pressure common rail fuel injection system on diesel engines has become one of the main development trends of diesel engine technology in the world today. It is an important means for diesel engines to reduce pollutant emissions. The high-pressure common rail fuel injection system can not only achieve stable high-pressure injection and a perfect combustion process, but also independently control the fuel injection characteristics, greatly improving the power performance, economy and emissions of diesel engines; the high-pressure common rail fuel system includes components such as a common rail fuel pump, a common rail pipe, an injector, an ECU, and sensors. Fuel is input from the fuel tank through a fuel filter into the common rail pump, pressurized in the plunger cavity and then sent into the common rail pipe. The pressure in the common rail pipe is controlled according to the pressure regulation signal sent by the ECU. The fuel is sent to the injector through a high-pressure oil pipe, and the injector injects the fuel into the combustion chamber of the diesel engine according to the instruction sent by the ECU. The common rail fuel pump is an important component of the high-pressure common rail fuel injection system, and the performance requirements of the common rail fuel pump are relatively precise in the system, including its oil discharge flow rate and the pressure range that can be established. Therefore, it is particularly important to ensure the connection reliability and flexibility between the high-pressure oil outlet and the common rail pipe, and the relevant devices for test connection also play an important role in specific applications;

[0003] Therefore, it is necessary to propose a high-pressure sealing connection device for high-pressure common rail fuel pump testing. Content of the Utility Model

[0004] The purpose of the utility model is to provide a high-pressure sealing connection device for high-pressure common rail fuel pump testing to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution:

[0006] A high-pressure sealing connection device for high-pressure common rail fuel pump testing includes a high-pressure common rail pump and a high-pressure common rail pipe. A connection component is arranged between the high-pressure common rail pump and the high-pressure common rail pipe, and the connection component can be used for high-pressure sealing connection in high-pressure common rail fuel pump testing.

[0007] In a preferred embodiment of the utility model, the connection component includes a first tapered surface adapter and a first left-hand and right-hand thread adapter nut. The first tapered surface adapter is connected to the oil outlet of the high-pressure common rail pump, and the first left-hand and right-hand thread adapter nut is connected to the other end of the first tapered surface adapter.

[0008] In a preferred embodiment of the present utility model, a conical surface port is provided at one end of the first conical surface adapter, and the conical surface port is tightly connected to the conical surface of the oil outlet of the high-pressure common rail pump. A left-handed thread head is provided at the other end of the first conical surface adapter.

[0009] In a preferred embodiment of the present utility model, a left-handed thread port is provided at one end of the first positive and negative thread adapter nut, and the left-handed thread port is threadedly connected to the left-handed thread head. A pipeline connection port is provided at the other end of the first positive and negative thread adapter nut.

[0010] In a preferred embodiment of the present utility model, a second conical surface adapter is hermetically connected to the high-pressure common rail pipe. The upper end of the second conical surface adapter is connected to the second positive and negative thread adapter nut. The structures of the second conical surface adapter and the second positive and negative thread adapter nut are the same as those of the first conical surface adapter and the first positive and negative thread adapter nut.

[0011] In a preferred embodiment of the present utility model, a high-pressure oil pipe is hermetically connected between the first positive and negative thread adapter nut and the second positive and negative thread adapter nut.

[0012] In a preferred embodiment of the present utility model, safety pressure relief ports are provided on both the first positive and negative thread adapter nut and the second positive and negative thread adapter nut. The safety pressure relief ports can effectively release the residual pressure in the high-pressure common rail pipe.

[0013] Additional aspects and advantages of the present utility model will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present utility model. Beneficial effects

[0014] The high-pressure common rail pump and the high-pressure common rail pipe are connected through a conical surface adapter and a positive and negative thread adapter nut. The positive and negative thread adapter nut is used for pre-tightening and disassembly during testing. During pre-tightening, the conical surface of the conical surface adapter is tightly connected to the conical surface of the oil outlet of the tested high-pressure pump. High-pressure sealing is achieved through the slight deformation of the combined conical surface. During disassembly, the residual pressure in the high-pressure rail pipe is released through the safety pressure relief port in the positive and negative thread adapter nut, which functions to protect the operator and prevent oil from splashing, improving the testing efficiency and safety. Description of the drawings

[0015] Figure 1 It is a test connection schematic diagram of a high-pressure sealing connection device for high-pressure common rail oil pump testing;

[0016] Figure 2 It is a structural diagram of a high-pressure sealing connection device for high-pressure common rail oil pump testing;

[0017] Figure 3 It is a cross-sectional view of the first positive and negative thread adapter nut in a high-pressure sealing connection device for high-pressure common rail oil pump testing;

[0018] Figure 4 It is a cross-sectional view of the first conical adapter in a high-pressure sealing connection device for high-pressure common rail fuel pump testing.

[0019] In the figure: high-pressure common rail pump 1, high-pressure common rail pipe 11, connection assembly 2, first conical adapter 21, conical port 211, left-handed threaded head 212, first positive and negative thread adapter nut 22, left-handed threaded port 221, pipeline connection port 222, safety relief port 223, second conical adapter 23, second positive and negative thread adapter nut 24, high-pressure oil pipe 25. Specific implementation manner

[0020] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0021] Such as Figures 1-4 ;

[0022] It includes a high-pressure common rail pump 1 and a high-pressure common rail pipe 11. A connection assembly 2 is provided between the high-pressure common rail pump 1 and the high-pressure common rail pipe 11, and the connection assembly 2 can be used for high-pressure sealing connection in high-pressure common rail fuel pump testing;

[0023] The connecting component 2 includes a first tapered surface adapter 21 and a first positive and reverse thread adapter nut 22. The first tapered surface adapter 21 is connected to the oil outlet of the high-pressure common rail pump 1. The first tapered surface adapter 21 and the first positive and reverse thread adapter nut 22 can be flexibly changed according to the thread specifications of the product to be tested. The first positive and reverse thread adapter nut 22 is connected to the other end of the first tapered surface adapter 21. The first tapered surface adapter 21 and the first positive and reverse thread adapter nut 22 are used for the test connection between the high-pressure oil outlet of the high-pressure common rail pump 1 and the high-pressure common rail pipe 11. The first positive and reverse thread adapter nut 22 plays a role in pre-tightening and disassembly during the test, and the connection angle can be flexibly adjusted. During pre-tightening, the tapered surface port 211 of the first tapered surface adapter 21 is tightly connected to the tapered surface of the oil outlet of the high-pressure common rail pump 1, and high-pressure sealing is achieved through the slight deformation of the combined tapered surface. One end of the first tapered surface adapter 21 is provided with a tapered surface port 211, and the tapered surface port 211 is tightly connected to the tapered surface of the oil outlet of the high-pressure common rail pump 1. The other end of the first tapered surface adapter 21 is provided with a left-handed thread head 212, and the left-handed thread head 212 is used for sealing connection into the left-handed thread port 221. One end of the first positive and reverse thread adapter nut 22 is provided with a left-handed thread port 221, and the left-handed thread port 221 is threadedly connected to the left-handed thread head 212. The other end of the first positive and reverse thread adapter nut 22 is provided with a pipeline connection port 222. A second tapered surface adapter 23 is hermetically connected to the high-pressure common rail pipe 11. The upper end of the second tapered surface adapter 23 is connected to a second positive and reverse thread adapter nut 24. The structures of the second tapered surface adapter 23 and the second positive and reverse thread adapter nut 24 are the same as those of the first tapered surface adapter 21 and the first positive and reverse thread adapter nut 22. A high-pressure oil pipe 25 is hermetically connected between the first positive and reverse thread adapter nut 22 and the second positive and reverse thread adapter nut 24. The high-pressure oil pipe 25 is used for transporting oil. Safety pressure relief ports 223 are provided on both the first positive and reverse thread adapter nut 22 and the second positive and reverse thread adapter nut 24. During disassembly, the safety pressure relief ports 223 can effectively release the residual pressure in the high-pressure common rail pipe 11, playing a role in protecting the operator and preventing oil from splashing.

[0024] The working principle of the present utility model is as follows: The first conical adapter 21 is connected to the oil outlet of the high-pressure common rail pump 1, and the first left-right thread adapter nut 22 is connected to the other end of the first conical adapter 21. The conical port 211 is tightly connected to the conical surface of the oil outlet of the high-pressure common rail pump 1, and the left-handed thread port 221 is threadedly connected to the left-handed thread head 212. The first conical adapter 21 and the first left-right thread adapter nut 22 can be flexibly changed according to the thread specifications of the product to be tested. The first conical adapter 21 and the first left-right thread adapter nut 22 are used for the test connection between the high-pressure oil outlet of the high-pressure common rail pump 1 and the high-pressure common rail pipe 11. The first left-right thread adapter nut 22 plays a role of pre-tightening and disassembly during the test, and the connection angle can be flexibly adjusted. During pre-tightening, the conical port 211 of the first conical adapter 21 is tightly connected to the conical surface of the oil outlet of the high-pressure common rail pump 1, and high-pressure sealing is achieved through the slight deformation of the combined conical surface. Safety pressure relief ports 223 are provided on both the first left-right thread adapter nut 22 and the second left-right thread adapter nut 24. During disassembly, the safety pressure relief port 223 can effectively release the residual pressure in the high-pressure common rail pipe 11, playing a role in protecting the operator and preventing oil from splashing. In the case of diverse specifications of the oil outlet of the common rail oil pump, the high-pressure common rail pump 1 and the high-pressure common rail pipe 11 are connected through the first conical adapter 21, the first left-right thread adapter nut 22, the high-pressure oil pipe 25, the second conical adapter 23, and the second left-right thread adapter nut 24. Among them, the structures of the second conical adapter 23 and the second left-right thread adapter nut 24 are the same as those of the first conical adapter 21 and the first left-right thread adapter nut 22, improving the test efficiency and safety.

[0025] Although the present utility model has been described above with reference to the embodiments, various improvements can be made to it and its components can be replaced with equivalents without departing from the scope of the present utility model. In particular, as long as there is no structural conflict, the various features in the disclosed embodiments of the present utility model can be combined with each other in any way. The reason for not exhaustively describing the situations of these combinations in this specification is only to save space and resources. Therefore, the present utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A high-pressure sealing connection device for testing a high-pressure common rail oil pump, comprising a high-pressure common rail pump (1) and a high-pressure common rail pipe (11), characterized in that: A connection assembly (2) is provided between the high-pressure common rail pump (1) and the high-pressure common rail pipe (11), and the connection assembly (2) can be used for high-pressure sealing connection in a high-pressure common rail oil pump test; The connection assembly (2) comprises a conical adapter (21) and a positive and negative thread adapter nut (22); the conical adapter (21) is connected to the oil outlet of the high-pressure common rail pump (1); the positive and negative thread adapter nut (22) is connected to the other end of the conical adapter (21); one end of the conical adapter (21) is provided with a conical port (211); the conical port (211) is tightly connected to the conical surface of the oil outlet of the high-pressure common rail pump (1); the other end of the conical adapter (21) is provided with a left-handed thread head (212); one end of the positive and negative thread adapter nut (22) is provided with a left-handed thread port (221); the left-handed thread port (221) is threadedly connected to the left-handed thread head (212); and the other end of the positive and negative thread adapter nut (22) is provided with a pipeline connection port (222).

2. A high-pressure sealing connection device for high-pressure common rail oil pump testing according to claim 1, characterized in that: The high-pressure common rail pipe (11) is sealedly connected to a second conical adapter (23), the upper end of which is connected to a second positive and negative thread adapter nut (24), and the structures of the second conical adapter (23) and the second positive and negative thread adapter nut (24) are the same as the structures of the first conical adapter (21) and the first positive and negative thread adapter nut (22).

3. A high-pressure sealing connection device for high-pressure common rail oil pump testing according to claim 2, characterized in that: The first and second forward and reverse thread transfer nut (22) and the second and forward and reverse thread transfer nut (24) are sealed to connect the high-pressure oil pipe (25).

4. A high-pressure sealing connection device for high-pressure common rail oil pump testing according to claim 3, characterized in that: The first and second forward and reverse thread transfer nut (22) and the second and forward and reverse thread transfer nut (24) are both provided with a safety pressure relief port (223), and the safety pressure relief port (223) can effectively release the residual pressure in the high-pressure common rail pipe (11).

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