KR102695977B1 - Fuel pump performance tester - Google Patents

Abstract

The present invention relates to a test device for testing an electric-driven fuel pump used in a fuel supply device of a gasoline engine or a diesel engine, and comprises a test main body having a work table on which a fuel pump is mounted; a current measuring unit provided in the test main body for measuring a current for operating and controlling a solenoid of the fuel pump; a pressure measuring unit provided in the test main body for measuring the pressure of fuel supplied through the fuel pump; a time measuring unit provided in the test main body for measuring the supply time of fuel supplied through the fuel pump; a noise measuring unit provided in the test main body for measuring noise due to the operation of the fuel pump; a display unit provided on the front of the test main body for displaying on a screen the measurement states of the current measuring unit, the pressure measuring unit, the time measuring unit, and the noise measuring unit so that the measurement states of the current measuring unit, the pressure measuring unit, the time measuring unit, and the noise measuring unit can be visually recognized; and a control unit for controlling the measurement and operation of the current measuring unit, the pressure measuring unit, the time measuring unit, the noise measuring unit, and the display unit. The present invention relates to a fuel pump test device capable of comprehensively examining the discharge pressure, discharge amount, sealing, earthquake resistance, water resistance, and durability of fuel.

Description

Fuel pump performance tester

The present invention relates to a testing device for testing an electric fuel pump used in a fuel supply device of a gasoline engine or a diesel engine, and more specifically, to a fuel pump testing device capable of comprehensively examining the fuel discharge pressure, discharge amount, sealing, earthquake resistance, water resistance, and durability.

Typically, a car's fuel supply system is a device that supplies the engine with the proper amount of fuel it needs. The engine can be driven by compressing air and fuel and then igniting it with an electric spark, or by igniting the fuel into a mist by high-pressure compression.

Therefore, the engine necessarily requires a fuel supply device including a fuel pump that can inject fuel into the combustion chamber at the appropriate pressure and timing.

In order to improve engine performance and fuel efficiency, tests are being conducted on fuel pumps.

For carburetor engines, these fuel pumps are mainly applied as mechanical diaphragm pump types, and for gasoline injection engines, they can be applied as electric motor pump types.

Here, the electric motor pump types include the electric motor type and the solenoid type, and currently, the electric motor type is being adopted in most cases.

The fuel pump is structured to include an upper plate and a reservoir cup arranged vertically inside the fuel tank, a filter installed inside the reservoir cup, and a motor for pumping fuel.

Typically, a fuel pump test device comprises a solenoid connected to a fuel pump to reciprocate the reciprocating rod of the fuel pump; a storage tank for storing test oil; a pressure pump for supplying and recovering test oil from the storage tank to the fuel pump; and a water cooler for exchanging heat with cooling water and sending test oil discharged from the fuel pump to the storage tank.

In the existing test device, the test oil is sent from the storage tank to the fuel pump by the pressure pump, and the temperature is controlled by cooling water in the water cooler during the process of returning the test oil from the fuel pump to the storage tank, and then returned to the storage tank.

In this way, temperature-controlled test oil is continuously supplied to the fuel pump and injected through the injection nozzle of the fuel pump, and the performance of the fuel pump, such as the injection amount or reciprocating load angle, is tested through a predetermined measuring device and control unit.

However, the conventional test device configured as described above has the following problems.

That is, the temperature of the test oil supplied to the fuel pump must be controlled, but since the temperature of the test oil is controlled by heat exchange with the coolant, it is very difficult to match the temperature of the test oil, and since there is a risk that the temperature will change with each test, it is difficult to repeat the test under the same conditions.

In addition, because the viscosity of the test oil changes, deteriorates, or becomes contaminated through repeated use, it becomes impossible to maintain properties that meet the test specifications, so the test oil must be replaced.

Therefore, it is difficult to clean the inside of the storage tank, which has discharged the test oil stored in the storage tank, because the conventional test device has the solenoid and fuel pump placed on the top of the frame and the storage tank is fixedly installed in the storage room at the bottom of the frame.

That is, in order to clean the inside of the storage tank, the copper pipes forming the flow path for the test oil must be separated, and the storage tank must be separated from the frame and taken out of the frame before cleaning, which results in a significant loss in terms of time and cost.

There is a problem that a lot of noise is generated during the test process, resulting in irregular pressure measurements.

KR 10-2015-0055477 A KR 20-0409648 Y1

In order to solve the above-mentioned problem, the present invention provides a fuel pump testing device which can comprehensively test the discharge pressure, discharge amount, sealing, earthquake resistance, water resistance, and durability of fuel by comprehensively including a current measuring unit, a pressure measuring unit, a time measuring unit, and a noise measuring unit, thereby reducing the inspection time compared to the past and increasing the number of fuel pumps inspected in proportion to efficiency.

In order to achieve the above object, the present invention comprises: a fuel pump; a test body having a work table on which the fuel pump is mounted; a current measuring unit provided in the test body and measuring a current for operating and controlling a solenoid of the fuel pump; a pressure measuring unit provided in the test body and measuring a pressure of fuel supplied through the fuel pump; a time measuring unit provided in the test body and measuring a supply time of fuel supplied through the fuel pump; a noise measuring unit provided in the test body and measuring noise according to the operation of the fuel pump; a display unit provided on the front of the test body and displaying a screen so that the measurement status of the current measuring unit, the pressure measuring unit, the time measuring unit, and the noise measuring unit can be visually recognized; and a control unit controlling the measurement and operation of the current measuring unit, the pressure measuring unit, the time measuring unit, the noise measuring unit, and the display unit; wherein the fuel pump comprises: an upper body having a valve actuator that reciprocates up and down, including a solenoid and a reciprocating rod; A lower body having a reservoir housing having a predetermined volume and having a fuel intake space and a fuel discharge space, which is sealed and provided at the lower part of the upper body, and having a fuel discharge port on one side and a reservoir cup sequentially provided at the lower part and having a fuel intake port; The fuel pump is configured with a membrane that forms a boundary between the reservoir housing and the upper body and a diaphragm that is pumped by the reciprocating rod of the upper body; wherein the volume of the suction space and the volume of the discharge space are formed to have a volume ratio of 1:3 based on the entire volume, and the suction pressure of the fuel pump is maintained at -4.9 kPa (-0.05 kgf/㎠) or less when the fuel pump is operated at the nominal voltage by opening the discharge port of the fuel pump and closing the suction port, and the discharge pressure of the fuel pump is maintained at 130% or less of the discharge pressure at the designated cutoff when the fuel pump is operated in the range of 90 to 120% of the process voltage and the maximum value of the discharge pressure is measured at the suction port, and the current measuring unit is configured to maintain the temperature around the fuel pump and the fuel temperature at the fuel pump suction port at 40℃ or less and the temperature of the windings of the electric drive unit is maintained constant when the fuel pump is operated at the nominal voltage. A fuel pump test device is provided, characterized in that it measures the temperature of a coil by a resistance method and checks whether the temperature rise at that time exceeds 60℃.

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By providing the present invention configured as described above, the fuel discharge pressure, discharge amount, sealing, earthquake resistance, water resistance, and durability can be comprehensively inspected, thereby reducing the inspection time compared to the past and increasing the number of fuel pump inspections relative to efficiency.

Figures 1 and 2 are front and side views showing a fuel pump testing device according to the present invention.
Figure 3 is a configuration diagram showing a test oil circulation structure applied to a fuel pump test device according to the present invention.
Figures 4 and 5 are cross-sectional views showing the operating status of a fuel pump, which is a measurement target, in a fuel pump test device according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings so that those with ordinary skill in the art can easily practice the present invention.

The fuel pump test device of the present invention, as shown in FIGS. 1 to 5, can be applied to all types of fuel pumps (10) including a fuel pump (10) of the type attached to the middle of a fuel pipe of an in-line pump (10), a fuel pump (10) of the type attached to the inside of a fuel tank of an in-tank pump, or an electric-driven rotor-type pump (10) whose pump section structure is rotary and driven by an electric motor.

First, a test body (20) having a work table (30) on which a fuel pump (10) is mounted is provided.

At this time, the test body (20) may be configured to include a current measuring unit (21), a pressure measuring unit (22), a time measuring unit (23), a noise measuring unit (24), a display unit (25), and a control unit (26).

The current measuring unit (21) is provided in the test body (20) and can measure the current that operates and controls the solenoid (111) of the fuel pump (10).

A pressure measuring unit (22) is provided in the test body (20) and can measure the pressure of fuel supplied through the fuel pump (10).

A time measuring unit (23) is provided in the test body (20) and can measure the supply time of fuel supplied through the fuel pump (10).

A noise measurement unit (24) is provided in the test body (20) and can measure noise resulting from the operation of the fuel pump (10).

The display unit (25) is provided on the front of the test body (20) and can display the measurement status of the current measurement unit (21), pressure measurement unit (22), time measurement unit (23), and noise measurement unit (24) on a screen so that the measurement status can be visually checked.

The control unit (26) can control the overall measurement and operation of the current measurement unit (21), pressure measurement unit (22), time measurement unit (23), noise measurement unit (24), and display unit (25).

The capacity of the fuel pump (10) can be expressed as a specified discharge amount for a specified discharge pressure, and the units may be kPa (kgf/㎠) and L/h, respectively, depending on the agreement between the parties taking over/delivering the product.

The nominal voltage of the fuel pump (10) can be limited to 6 V, 12 V and 24 V.

In order to test the performance of the fuel pump (10), the suction pressure, discharge amount according to discharge pressure, sealing, earthquake resistance, water resistance, and durability can be measured and confirmed.

First, the dry suction pressure can be suggested as -4.9 kPa (-0.05 kgf/cm2) or less when the fuel pump (10) is operated at nominal voltage by opening the discharge port (211) and closing the suction port (221) while keeping the inside of the fuel pump (10) and the suction pipe in a dry state.

In the case of a blocking discharge pressure, the average value of the discharge pressure when the discharge port (211) is closed while the fuel pump (10) is operated at the nominal voltage must be in the range of 70 to 100% of the discharge pressure at the specified blocking.

The maximum value of the discharge pressure at the time of blocking is limited to 130% or less of the specified discharge pressure at the time of blocking when the fuel pump (10) is operated in the range of 90 to 120% of the process voltage and measured at the carburetor intake while using a piping for a carburetor pump.

The discharge amount for temperature and voltage when the discharge port (211) is set to the specified discharge pressure is as shown in [Table 1].

[Table 1]

Regarding the temperature rise of the electric drive unit, the temperature around the fuel pump (10) and the fuel temperature at the fuel pump (10) intake port (221) are maintained at 40°C or less, the fuel pump (10) is operated at the nominal voltage, and when the temperature of the winding of the electric drive unit becomes constant, the temperature of the winding is measured by the resistance method, and the temperature rise at that time must not exceed 60°C. However, the intake port (221) of the fuel pump (10) is open, and the discharge port (211) is set at the specified discharge pressure.

In case of confidentiality, when the discharge port (211) is closed by applying air pressure equal to the discharge pressure when the suction port (221) is blocked by 98 kPa (1 kgf/cm2) or more and immersed in the test fluid and maintained for 10 seconds or more, there should be no leakage.

In case of earthquake resistance, the fuel pump (10) can be operated at the nominal voltage, the intake port (221) and the discharge port (211) can be opened, and a test can be conducted according to step 4 of the vibration endurance test method of KS R 1034.

The performance of the fuel pump (10) after the test shall be satisfactory in terms of dry suction pressure, discharge pressure at blocking, discharge amount, temperature rise of the electric drive unit, and airtightness, and no harmful defects shall occur in any part of the structure.

In case of water resistance, when the fuel pump (10) is tested according to R2 of KS R 0015, the external water is wiped off, and left for 1 hour, there should be no abnormalities in the insulation resistance or other parts.

In the case of room temperature durability, when the fuel pump (10) is driven under the conditions shown in [Table 2] and the test of dry suction pressure and discharge pressure at blocking and the test of room temperature nominal voltage characteristics for airtightness are performed, the performance can be 90% or more of the specified value.

Additionally, confidentiality must be maintained by satisfying the confidentiality test and no detrimental defects may occur in any part of the structure.

[Table 2]

In the case of high temperature durability, the fuel pump (10) was operated under the conditions shown in [Table 2], and the test results of the average values of the dry suction pressure and the discharge pressure at the time of blocking and the test results of the nominal voltage characteristics of the discharge amount at room temperature were tested. The performance can be suggested as shown in [Table 2].

Additionally, confidentiality must be satisfied and no detrimental defects may occur in any part of the structure.

In terms of structure, the sealing of the pump section is good, and a structure without fuel leakage is proposed, and in the case of an ignition-prevention structure, if fuel leaks from the fuel pump (10) section and the pipe connection section, a structure can be formed in which the fuel does not enter a section where there is a risk of ignition.

In addition, parts that are at risk of ignition, such as electrical inspections, must be structured so that they do not ignite even if fuel splashes out from the outside.

Here, the joints of the intake port (221) and the discharge port (211) of the fuel pump (10) are, in principle, as shown in [Table 3].

[Table 3]

In the case of wire terminals, wire terminals used in fuel pumps (10) should in principle be CA104, CB104 or LA of KS R 5016, and the surfaces of each part of the fuel pump (10) should be free of harmful scratches, rust, casting pores, burrs and deformations, and other defects.

Therefore, the general conditions of the test can be performed at room temperature unless otherwise specified, and the fuel used for the test can be that specified in KS M 2611, KS M 2612, or KS M 2613.

Meanwhile, the device used for testing the discharge amount is a fuel pump (10) and a suitable device for measuring the fuel temperature inside the fuel tank and the ambient temperature of the fuel pump (10) by adjusting the fuel temperature, and a fuel pump (10) with a filter can be tested with the filter attached.

As a performance test, the dry suction pressure test is limited to -4.9 kPa (-0.05 kgf/㎠) or less, and the discharge pressure test at blocking must be in the range of 70 to 100% of the specified discharge pressure at blocking.

The fuel pump (10) is configured to perform a pumping operation through an upper body (100) and a lower body (200) that are flange-coupled to each other and a diaphragm (300) provided therebetween, as shown in FIGS. 4 and 5.

Diaphragm refers to a sealing function for pressure detection, pressure displacement, or power conversion. There are metal diaphragms and non-metal diaphragms, and they are used for calculations or amplification elements of devices that use air pressure. The former uses a metal disk transformed into a wave shape to balance the elasticity and pressure of the material, and the latter uses a spring that is corrected by pressing the center with a metal seat.

The technology of the above components being mutually coupled and pumping in operation is a conventional technology.

The upper body (100) has a valve actuator (110) that reciprocates up and down, including a solenoid (111) and a reciprocating rod (113).

In other words, a solenoid (111) is provided inside an upper body (100) that goes through a predetermined space, and a reciprocating rod (113) that is provided in the center to reciprocate is reciprocated by a magnetic force generated by an electric signal supplied by a connected wire. When the magnetic force is generated, the reciprocating rod (113) is retracted, and when the magnetic force is released, the solenoid (111) moves forward by the restoring force of a spring (115) provided at the tip of the rod, and the diaphragm (300) located at the tip of the reciprocating rod (113) is operated transversely to perform pumping.

Meanwhile, the lower body (200) is sealed and provided at the lower portion of the upper body (100), and is configured to include a housing having a predetermined volume to have a fuel intake space (213) and a fuel discharge space (215), a reservoir housing (210) having a fuel discharge port (211) at one side, and a reservoir cup (220) sequentially provided at the lower portion and having a fuel intake port (221).

Here, the reservoir housing (210) and the reservoir cup (220) of the lower body (200) are sequentially positioned, and a plurality of bolts are fastened corresponding to fastening holes penetrating along the longitudinal direction to securely connect them, and it is preferable that a gasket be provided with the same area as each connection to provide sealing power.

Meanwhile, the membrane that forms the boundary between the diaphragm (300) reservoir housing (210) and the upper body (100) can be pumped by the reciprocating rod (113) of the upper body (100).

At this time, an air pocket (400) having a predetermined elastic space (410) may be further provided in the discharge space (215).

A check valve (230) is provided in each of the discharge space (215) and the suction space (213) of the reservoir housing (210), and when fuel is sucked into the suction space (213) by the lateral operation of the diaphragm (300), the diaphragm (300) retracts and the fuel is pumped into the pumping space through the check valve (230), and conversely, when the diaphragm (300) advances and the fuel located in the pumping space is pumped through the check valve (230), the discharge pressure of the fuel discharged from the discharge space (215) through the discharge port (211) can be maximized by the elasticity of the air pocket (400) provided in the discharge space (215).

In addition, the volume of the suction space (213) formed in the reservoir housing (210) can be formed relatively smaller than the volume of the discharge space (215). That is, the discharge pressure can be increased by forming the volume of the discharge space (215) larger than the volume of the suction space (231).

At this time, it is preferable that the volume ratio of the suction space (213) and the discharge space (215) be formed to have a volume ratio of 1:3 based on the total volume.

Accordingly, since the volume of the discharge space (215) as described above is formed larger than the volume of the suction space (213), the discharge pressure of the fuel discharged through the discharge port (211) can be increased to 460 to 500 Pa.

The air pocket (400) may include one or a combination of silicone or PVC materials, and may include two check valves (230) made of metal plates between the suction space (213) and the discharge space (215).

By providing the present invention configured as described above, the fuel discharge pressure, discharge amount, sealing, earthquake resistance, water resistance, and durability can be comprehensively inspected, thereby reducing the inspection time compared to the past, and increasing the number of inspections of the fuel pump (10) relative to efficiency.

The terms and words used in this specification and claims described above should not be interpreted as limited to their usual or dictionary meanings, but should be interpreted as meanings and concepts that conform to the technical idea of the present invention based on the principle that the inventor can appropriately define the concept of the term in order to explain his own invention in the best way.

Therefore, the configurations depicted in the drawings and embodiments described in this specification are only the most preferred embodiment of the present invention, and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application.

10: Fuel pump 20: Test body
21: Current measurement section 22: Pressure measurement section
23: Time measurement section 24: Noise measurement section
25: Display section 26: Control section
30: Worktable 100: Upper body
110: Valve actuator 111: Solenoid
113: Round trip load 115: Spring
200: Lower body 210: Reservoir housing
211: Discharge port 213: Suction space
215: Discharge space 220: Reservoir cup
221: Inlet 230: Check valve
300: Diaphragm 400: Air Pocket
410: New space

Claims (4)

Fuel pump (10);
A test main body (20) having a work table (30) on which the above fuel pump (10) is mounted;
A current measuring unit (21) provided in the above test main body (20) and measuring the current that operates and controls the solenoid (111) of the fuel pump (10);
A pressure measuring unit (22) provided in the above test main body (20) and measuring the pressure of fuel supplied through the fuel pump (10);
A time measuring unit (23) provided in the above test main body (20) and measuring the supply time of fuel supplied through the fuel pump (10);
A noise measuring unit (24) provided in the above test body (20) and measuring noise resulting from the operation of the fuel pump (10);
A display unit (25) provided on the front of the above test body (20) and displaying the measurement status of the current measurement unit (21), pressure measurement unit (22), time measurement unit (23), and noise measurement unit (24) on a screen so that the measurement status can be visually checked; and
A control unit (26) that controls the measurement and operation of the current measuring unit (21), pressure measuring unit (22), time measuring unit (23), noise measuring unit (24), and display unit (25);
Including,
The above fuel pump (10);
An upper body (100) having a valve actuator (110) that reciprocates up and down, including a solenoid (111) and a reciprocating rod (113);
A lower body (200) including a reservoir housing (210) having a predetermined volume, which is sealed and provided at the lower portion of the upper body (100) and has a fuel intake space (213) and a fuel discharge space (215) and has a fuel discharge port (211) at one side, and a reservoir cup (220) which is sequentially provided at the lower portion and has a fuel intake port (221);
A diaphragm (300) that acts as a boundary between the reservoir housing (210) and the upper body (100) and is pumped by the reciprocating rod (113) of the upper body (100);
It consists of,
The volume ratio of the above suction space (213) and the volume ratio of the above discharge space (215) are formed to have a volume ratio of 1:3 based on the total volume.
The suction pressure of the fuel pump (10) is
When the fuel pump (10) is operated at the nominal voltage by opening the discharge port (211) of the fuel pump (10) and closing the suction port (221), the suction pressure is maintained at -4.9 kPa (-0.05 kgf/㎠) or less.
The discharge pressure of the fuel pump (10) is
The fuel pump (10) is operated in the range of 90 to 120% of the process voltage, and the maximum value of the discharge pressure measured at the intake port is maintained below 130% of the discharge pressure at the designated cutoff.
The current measuring section is,
A fuel pump test device characterized in that the temperature around the fuel pump (10) and the fuel temperature at the fuel pump (10) intake (221) are maintained at 40°C or less, the fuel pump (10) is operated at a nominal voltage, and the temperature of the windings of the electric drive part is kept constant, the temperature of the windings is measured by the resistance method, and it is checked whether the temperature rise at that time exceeds 60°C. delete delete delete