CN100427913C - Fuel pump valve performance test device - Google Patents

Abstract

The invention relates to a fuel pump valve performance testing device, which comprises: a pipeline part, a pressure sensor (5) for testing the pressure at the fuel inlet end of a fuel pump outlet (12), and a pressure sensor (5) for testing the pressure at the fuel pump outlet (12). 12) Solenoid valve (1) on the oil outlet pipe of the check valve; the pipeline part includes: the pressure gas source used to communicate with the oil inlet end of the fuel pump outlet (12), and the pressure gas source used to communicate with the fuel pump outlet (12) ) with a negative pressure generator connected to the oil inlet; a solenoid valve (2) is provided between the oil inlet (12) of the fuel pump and the pressure gas source, and the oil outlet (12) of the fuel pump is connected to the negative pressure An electromagnetic valve (3) is arranged between the generators; the output end of the pressure sensor (5) is connected with the computer. The test device of the present invention provides positive pressure gas to the oil port through the pressure gas source, vacuumizes the oil outlet through the negative pressure generator to generate negative pressure, and tests the opening pressure, sealing performance and check valve of the overflow valve through the pressure sensor The sealing performance and other parameters.

Description

Fuel pump valve performance test device

technical field

The invention relates to an automobile fuel pump, in particular to a device for testing the performance of a valve at an outlet of the fuel pump during the production process of the fuel pump.

Background technique

The automobile fuel pump is an important component of the automobile fuel supply system. The fuel pump outlet is equipped with a fuel supply check valve and a safety overflow valve. The main function of the oil supply check valve is to restrict the flow of oil in one direction and not in the opposite direction. The performance requirements of the check valve mainly include: when the oil flows through the check valve, the resistance should be small, that is, the pressure loss should be small; There should be no vibration, shock and noise. The safety relief valve overflows through the valve port to keep the pressure of the controlled system or circuit stable, realize pressure regulation, pressure stabilization and pressure limitation, so as to meet the requirements of various loads. The performance requirements for the relief valve are: its relief characteristics, opening and closing characteristics and pressure regulation stability are better.

During the production process of the fuel pump, in order to improve the reliability of the product and ensure the normal operation of the equipment, the performance of the fuel pump outlet valve must be tested to determine whether the valve is invalid.

For a long time, the detection of valve performance has been using the traditional method in the 1960s and 1970s-manual oil detection method, that is, simulating the working conditions of the fuel pump, filling the oil outlet pipeline with oil, and then passing through a few days. Observe the leakage of the oil supply check valve. This kind of detection has low efficiency and large error, and is not suitable for testing the fuel pump outlet valve on the fuel pump production line, and can only test the static performance, not the dynamic performance.

Contents of the invention

The technical problem to be solved by the present invention is to provide a fuel pump valve performance test device, which has high detection efficiency and small error, can test the static and dynamic performance of fuel pump valves, and is suitable for use in fuel pump production lines Test the fuel pump outlet valve.

The technical solution adopted by the present invention to solve the problems of the technologies described above is:

Fuel pump valve performance test device, which includes;

pipeline part,

The pressure sensor used to test the pressure at the fuel inlet end of the fuel pump outlet,

The solenoid valve used to be arranged on the oil outlet pipe of the check valve at the oil outlet of the fuel pump;

The pipeline part includes:

The pressure air source used to communicate with the fuel inlet port of the fuel pump outlet,

A negative pressure generator used to communicate with the fuel inlet of the fuel pump outlet;

A solenoid valve is provided between the fuel inlet of the fuel pump outlet and the pressure gas source, and a solenoid valve is arranged between the fuel inlet of the fuel pump outlet and the negative pressure generator; the output of the pressure sensor is connected to the computer.

In the above scheme, the test device also includes:

workbench for fixing fuel pump outlet,

Connecting pressure head for docking with the fuel inlet port of the fuel pump,

The propulsion mechanism connected to the pressure head,

Brackets for supporting the propulsion mechanism;

An air connection device is arranged on the air connection head, and the pipeline part and the pressure sensor communicate with the tube core (11) of the air connection head through the air connection device.

In the above solution, the negative pressure generator is a negative pressure generator driven by pressure gas, and its power gas input end communicates with the pressure gas source through a solenoid valve.

In the above scheme, the propelling mechanism is a cylinder propelling mechanism.

In the above scheme, the propulsion mechanism is controlled by a computer.

The test device of the present invention changes the artificial oil detection method, provides positive pressure gas to the oil port through the pressure gas source, vacuumizes the oil outlet through the negative pressure generator to generate negative pressure, and tests the opening pressure of the overflow valve through the pressure sensor , sealing performance and the sealing performance of the check valve and other parameters.

Compared with the prior art, the present invention has the following advantages:

1. The device has high detection efficiency, high pressure sensor precision and small error, and is suitable for testing the fuel pump outlet valve on the fuel pump production line;

2. No oil is used, and the test piece will not be polluted;

3. The air pressure head is propelled by the propulsion mechanism, which can realize the mechanized operation of the detection process;

4. The propulsion mechanism is controlled by computer to realize the automation of the detection process.

Description of drawings

Fig. 1 is the structural block diagram of the gas circuit part of embodiment 1 of the testing device of the present invention

Fig. 2 is the block diagram that embodiment 1 of testing device of the present invention is connected with computer

Fig. 3 is the structural representation of the workbench part of the test device embodiment 1 of the present invention

Figure 4 is a schematic diagram of the structure of the gas-connecting device

Figure 5 is a schematic diagram of the structure of the briquette

Figure 6 is an axial sectional view of the joint connected with the oil outlet pipe of the check valve

Figure 7 is the ideal pressure curve of the fuel pump oil supply check valve and safety relief valve during the test

Fig. 8 is a structural block diagram of the gas circuit part of Embodiment 2 of the testing device of the present invention

Detailed ways

The test device embodiment 1 of the present invention as shown in Fig. 1, it comprises: pipeline part, the pressure sensor 5 that is used to test the fuel pump oil outlet 12 oil inlet end pressures, is used to be arranged on the fuel pump oil outlet 12 reverse Solenoid valve 1 on the oil outlet pipe of the stop valve; the pipeline part includes: a pressure gas source for communicating with the oil inlet end of the oil outlet 12 of the fuel pump, and a negative pressure generator for communicating with the oil inlet end of the oil outlet 12 of the fuel pump A solenoid valve 2 is arranged between the oil inlet end of the fuel pump outlet 12 and the pressure gas source, and an electromagnetic valve 3 is arranged between the oil inlet end of the fuel pump outlet 12 and the negative pressure generator. The negative pressure generator is a negative pressure generator driven by pressure gas, and its power gas input end communicates with the pressure gas source through the solenoid valve 4 .

As shown in Figure 2, the output end of the pressure sensor 5 is connected to the computer, and the solenoid valve is controlled by the computer.

As shown in Figure 3, the test device also includes: a workbench 6 for fixing the fuel pump outlet 12, a connecting pressure head 7 for docking with the fuel inlet port 12 of the fuel pump, and a connecting pressure head propulsion mechanism 8 , The bracket 9 for supporting the propulsion mechanism. The propelling mechanism 8 is a cylinder propelling mechanism, as shown in Figure 2, the propelling mechanism 8 is controlled by a computer. The gas connection device 10 is provided on the gas connection head 7 , as shown in FIG. 4 , the pressure sensor 5 communicates with the die 11 of the gas connection head through the gas connection device 10 . The pipeline part communicates with the tube core 11 connected to the air head through the joint 13 and the gas connection device 10 . The gas connection device 10 is also provided with a control switch 14 to control the stroke of the cylinder. When the cylinder went to the required position, the control switch 14 sent a signal to the computer, and the computer controlled the cylinder to stop moving.

As shown in Figures 3 and 5, a briquetting block 15 is provided on the workbench 6, and the briquetting block 15 is provided with a hole 1502 for fixing the oil outlet of the fuel pump and a butt joint 16 for installing the oil outlet pipe of the check valve (as shown in Figure 6 shown) hole 1501. The function of the hole 1502 on the briquetting block 15 and the butt joint 16 is to limit the position of the fuel pump outlet 12, that is, the fuel pump outlet 12 is fixed on the workbench 6 through the briquetting block 15, and ensure that the fuel pump outlet 12 Oil inlet tightness.

The specific operation process of the test device embodiment 1 of the present invention is as follows:

The operator places the oil outlet of the fuel pump upside down on the workbench 6 (when using the device for the first time, the pressing block 15 must be manually adjusted to ensure the tightness). After the oil outlet of the fuel pump is positioned, a signal is given to the computer, and the cylinder propulsion mechanism is pressed down, and the air cylinder 7 is connected to the oil outlet and the oil inlet end of the sealed oil outlet. The computer controls solenoid valves 1, 3, 4 to close, solenoid valve 2 to open, the pressure gas source pressurizes the oil inlet of the oil outlet, and when a certain pressure is reached, the safety overflow valve opens; the above process is shown in the pressure curve in Figure 7 as 1 to 2. At this time, the computer controls the solenoid valve 2 to also close, and maintains the pressure within the given time of the computer, and judges the leak tightness of the overflow valve during the pressure maintaining process; this section process is 2 to 3 on the pressure curve of Figure 7 . After the pressure maintaining is finished, the solenoid valve 1 is controlled by the computer to open for pressure relief, and the oil supply check valve is opened. This section process is 3 to 4 on the pressure curve of Fig. 7. The above steps are the positive pressure detection part. Next, the computer controls the solenoid valves 1 and 2 to close, the solenoid valves 3 and 4 to open, the pressure gas source drives the negative pressure generator to work, and the vacuum is drawn to detect the tightness of the oil supply check valve; this process is shown in the pressure curve in Figure 5 The above is the part after 4. Finally, the operator unloads the tested oil outlet from the workbench.

As shown in Figure 8, Example 2 of the testing device of the present invention, the negative pressure generator is a vacuum pump controlled by a computer.

In the embodiment of the present invention described above, the computer operator can judge the quality inspection status of the check valve and overflow valve according to the real-time display and historical data. In the whole process, there are less manual operations and more automatic operations. The advantages of computer-aided testing are that it has powerful data processing functions, high test accuracy, can ensure real-time measurement, prevent human errors, compensate for nonlinearity of sensors, realize automatic control of the entire test process, and strictly control test conditions. Improve test efficiency.

Claims (4)

1, equipment for testing valve performance of oil fuel pump is characterized in that: it comprises:

Pipeline portions,

Be used to test fuel pump oil-out (12) oil inlet end pressure pressure transducer (5),

Be used to be arranged on the solenoid valve (1) on fuel pump oil-out (12) the reverse checkvalve flowline;

Pipeline portions comprises:

The pressure gas source that is used for being communicated with fuel pump oil-out (12) oil inlet end,

Be used for the negative pressure generator that is communicated with fuel pump oil-out (12) oil inlet end;

Be provided with solenoid valve (2) between fuel pump oil-out (12) oil inlet end and the pressure gas source, be provided with solenoid valve (3) between fuel pump oil-out (12) oil inlet end and the negative pressure generator; The output terminal of pressure transducer (5) is connected with computing machine,

Proving installation also comprises:

Be used for fixing fuel pump oil-out (12) worktable (6),

Be used for docking with fuel pump oil-out (12) oil inlet end connect air pressure head (7),

Connect the air pressure head propulsive mechanism (8),

Be used to support the support (9) of propulsive mechanism;

Connect air pressure head (7) and be provided with and connect device of air (10), pipeline portions and pressure transducer (5) are communicated with the tube core that connects the air pressure head (11) by connecing device of air (10).

2, proving installation as claimed in claim 1 is characterized in that: negative pressure generator is the negative pressure generator that pressed gas drives, and its power gas input end is communicated with pressure gas source by solenoid valve (4).

3, proving installation as claimed in claim 1 is characterized in that: propulsive mechanism (8) is the cylinder propulsive mechanism.

4, proving installation as claimed in claim 1 is characterized in that: propulsive mechanism (8) is by computer control.

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