Automatic test tool for air filter blockage alarm sensor

Abstract

The utility model provides an automatic test tool for an air filter blocking alarm sensor, which comprises a power supply, a vacuum pump, an air pressure regulating valve, a time relay, a counting relay and the air filter blocking alarm sensor, the time relay and the counting relay are electrically connected with the power supply, and the counting relay, the time relay and the vacuum pump are electrically connected in pairs respectively. An air inlet of the vacuum pump is connected with an air pressure regulating valve through an air delivery pipe; the air pressure regulating valve is connected with an air filter blockage alarm sensor through an air delivery pipe; the time relay controls the opening and closing time of the vacuum pump, the counting relay records the power-on and power-off times of the vacuum pump, and the counting relay cuts off the power of the time relay and the vacuum pump after the cycle of the preset times is reached, thereby completing the whole test process, and achieving the automatic product durability test. The vacuum holding time, the pressure relief holding time and the reciprocating operation frequency can be controlled, and accurate testing is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of sensor testing, in particular to an automatic testing tool for an air filter blockage alarm sensor. Background Art

[0002] In order for the engine to operate normally, a large amount of pure air must be inhaled. If substances harmful to the engine (dust, colloid, aluminum oxide, iron oxide, etc.) are inhaled into the air, the cylinder and piston components will increase the burden and suffer abnormal wear and even mix into the engine oil, causing greater wear and resulting in deterioration of engine performance and shortened life. The air filter (abbreviated as air filter) is a device that filters the air inhaled into the engine.

[0003] During the use of the air filter, the gas with impurities will pass through the filter device inside the air filter and be blocked. After long-term use, a large amount of impurities will be adsorbed on the filter device and the air filter will be blocked, resulting in a continuous increase in gas flow resistance and an increasing pressure difference on both sides of the filter device. In addition, the engine will have insufficient air intake, incomplete fuel combustion, unstable engine operation, reduced power, and increased fuel consumption. Therefore, it is necessary to monitor the blockage condition of the air filter. In the prior art, an air filter blockage alarm sensor is usually used for monitoring. The sensor usually determines the blockage condition based on the pressure difference on both sides of the filter device. The method is to monitor the pressure difference through a switch pressure sensor, and when the pressure difference reaches the sensor connection value, an alarm is issued to prompt the replacement of the air filter.

[0004] Because the air filter blockage alarm sensor needs to be constantly tested by the high temperature and high pressure environment in the automobile engine, it is easy to fail, so it is necessary to test the durability of the air filter blockage alarm sensor. In the prior art, the test is carried out by a simple vacuum device, which cannot realize the reciprocating switch and holding time action, and cannot be automated. Utility Model Content

[0005] Based on the defects of the prior art, the utility model provides an automatic test tool for an air filter blockage alarm sensor, which is characterized by comprising a power supply, a vacuum pump, an air pressure regulating valve, a time relay, a counting relay, an air filter blockage alarm sensor,

[0006] The air inlet of the vacuum pump is connected to the air pressure regulating valve through the air supply pipe, and the air pressure regulating valve is connected to the air filter blockage alarm sensor through the air supply pipe;

[0007] The time relay is a cycle time relay, the positive power supply terminal of the time relay is connected to the positive pole of the power supply, and the negative power supply terminal of the time relay is connected to the common terminal of the counting relay;

[0008] The terminal of the normally closed contact of the time relay is connected to the positive electrode of the vacuum pump, and the negative electrode of the vacuum pump is connected to the common terminal of the counting relay;

[0009] The positive power supply terminal of the counting relay is connected to the positive pole of the power supply, the negative power supply terminal is connected to the negative pole of the power supply, and the terminal of the normally closed contact of the counting relay is connected to the negative pole of the power supply.

[0010] Furthermore, it also includes a negative pressure gauge, which is connected between the air pressure regulating valve and the air filter clogging alarm sensor through an air supply pipe.

[0011] Furthermore, it also includes a gas flow meter, which is connected between the air pressure regulating valve and the air filter clogging alarm sensor through a gas supply pipe.

[0012] Furthermore, it also includes a vacuum pump voltage regulator, which is electrically connected to the vacuum pump and is used to adjust the power of the vacuum pump.

[0013] Furthermore, it also includes a time relay reset switch electrically connected to the time relay, which is used to reset the set time.

[0014] Furthermore, it also includes a shell, and the power supply, vacuum pump, air pressure regulating valve, time relay, and counting relay are all installed in the shell.

[0015] Furthermore, an air intake interface is fixed on the outer wall of the shell, and one end of the air intake interface on the inner side of the shell is connected to the air pressure regulating valve through an air pipe, and one end of the air intake interface on the outer side of the shell is connected to the air filter blockage alarm sensor through the air pipe.

[0016] Furthermore, an exhaust interface is fixed on the outer wall of the shell, and one end of the exhaust interface on the inner side of the shell is connected to the air outlet of the vacuum pump through an air supply pipe.

[0017] Furthermore, the air filter clogging alarm sensor is electrically connected to an indicating load for indicating whether the air filter clogging alarm sensor is working normally.

[0018] Furthermore, the indicating load is an indicating light.

[0019] Beneficial effects:

[0020] The technical solution of the utility model connects the air filter blockage alarm sensor to the vacuum pump, and triggers the air filter blockage alarm sensor to work by vacuuming the vacuum pump. The air filter blockage alarm sensor is connected to an indicator light. When it is closed under negative pressure, the indicator light lights up, indicating that the air filter blockage alarm sensor functions normally. In order to realize the automated test of the air filter blockage alarm sensor, the application sets a time relay and a counting relay. The time relay controls the opening and closing time of the vacuum pump, and the counting relay records the number of power-on and power-off times. Each time the vacuum pump is opened and closed is a cycle, and the counting relay records a cycle. When the predetermined number of cycles is reached, the counting relay cuts off the power of the time relay and the vacuum pump to complete the entire test process, thereby realizing the automated negative pressure product durability test, and can control the vacuum holding time, the pressure relief holding time, and the number of reciprocating operations to achieve precise testing.

[0021] At the same time, a negative pressure gauge and a gas flow meter are also provided. The nominal value of the working pressure in the test fixture is adjusted through the air pressure regulating valve, so that the corresponding working pressure can be fixed according to different models of products to be tested, thereby enhancing the scalability of the test fixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following drawings are only used to illustrate and explain the present invention, and do not limit the scope of the present invention.

[0023] Figure 1 It is an overall schematic diagram of an embodiment of the utility model.

[0024] Figure 2 This is a framework connection diagram of various components of an embodiment of the utility model.

[0025] Figure 3 This is a circuit wiring diagram of an embodiment of the utility model.

[0026] Description of reference numerals: 1. housing; 2. equipment switch; 4. air pressure regulating valve; 5. time relay; 6. counting relay; 7. air filter blockage alarm sensor; 8. time relay reset switch;

[0027] 9. Vacuum pump voltage regulator; 10. Negative pressure gauge; 11. Gas flow meter; 12. Indicator light;

[0028] 13. Air intake interface; 14. Air exhaust interface; 15. Air supply pipe. DETAILED DESCRIPTION

[0029] In order to have a clearer understanding of the technical features, purposes and effects of this invention, the specific implementation methods of the present invention are now described with reference to the accompanying drawings. The same reference numerals in each figure represent the same parts. In order to make the drawings concise, the parts related to the present invention are schematically shown in each figure, and do not represent the actual structure of the product. In addition, in order to make the drawings concise and easy to understand, in some figures, only one of the parts with the same structure or function is schematically drawn or marked.

[0030] In the present invention, "connection" may include direct connection, indirect connection, communication connection, and electrical connection, unless otherwise specified.

[0031] The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. As used herein, the singular forms "one", "a kind of", and "the" are intended to also include plural forms, unless the context clearly stipulates otherwise. It will also be understood that when used in the specification, the terms "include" and / or "comprising" refer to the presence of stated features, numerical values, steps, operations, elements and / or components, but do not exclude the presence or additional addition of one or more other features, numerical values, steps, operations, elements, components and / or the group of its composition. As used in this article, the term "and / or" includes any and all combinations of one or more of the related items listed.

[0032] The utility model provides an automatic test tool for an air filter blockage alarm sensor. Figure 1 and Figure 2 As shown, it includes a shell 1, in which a power supply, a vacuum pump, an air pressure regulating valve 4, a time relay 5, a counting relay 6, a time relay reset switch 8, a vacuum pump voltage regulator 9, a negative pressure gauge 10, and a gas flow meter 11 are arranged.

[0033] A device switch 2 is fixed on the outer wall of the housing 1 , and the device switch 2 is electrically connected to the power supply in the housing 1 for controlling the start and stop of the entire test fixture.

[0034] An air intake interface 13 and an air exhaust interface 14 connecting the inside and outside of the shell 1 are also fixed on the outer wall of the shell 1 mounting device switch 2. The air inlet of the vacuum pump is connected to the air outlet of the air pressure regulating valve 4 through the air supply pipe 15. The air inlet of the air pressure regulating valve 4 is connected to one end of the air intake interface 13 on the inner side of the shell 1 through the air supply pipe 15. The end of the air intake interface 13 located on the outer side of the shell 1 is connected to the air filter blockage alarm sensor 7 through the air supply pipe 15. The air outlet of the vacuum pump is connected to one end of the exhaust interface 14 on the inner side of the shell 1 through the air supply pipe 15.

[0035] The air filter blockage alarm sensor 7 is connected to an external power source and is electrically connected to an indicating load for indicating whether the air filter blockage alarm sensor 7 is working normally. In this embodiment, the indicating load is an indicating light 12 .

[0036] When the vacuum pump is powered on, it starts to draw a vacuum, and negative pressure is generated in the air pipe 15 channel connected to the air inlet and the air filter blockage alarm sensor 7. The air filter blockage alarm sensor 7 is closed, thereby connecting the external power supply and the indicator light 12. The indicator light 12 is lit, indicating that the air filter blockage alarm sensor 7 is functioning normally.

[0037] The above is a cycle of testing the air filter blockage alarm sensor 7. To complete the durability test of the air filter blockage alarm sensor 7, the above cycle needs to be repeated continuously. According to the standard test of durability, the normal working environment conditions of the air filter blockage alarm sensor 7 are a temperature of 18-28°C, a relative humidity of 45-75%, an air pressure of 86-106kPa, and a nominal alarm value of 4-8kPa. Under normal working conditions, the error of the output value of the air filter blockage alarm sensor 7 is ±8% of the inspected point, and the alarm start value is ±0.6kPa of the nominal alarm value. After 10,000 cycles of durability testing, the air filter blockage alarm sensor 7 should not have any mechanical damage, and the output value should meet the above requirements.

[0038] In order to realize the durability test of the air filter blockage alarm sensor 7 for 10,000 cycles automatically, the present application places the air filter blockage alarm sensor 7 on the pressure test bench under the above-mentioned conventional working environment conditions. In this embodiment, the time relay 5 in the housing 1 adopts a cyclic time relay with a set of normally open and normally closed contacts, and two delay times T1 and T2 can be set. After power is turned on, T1 starts to delay, and the normally closed contact of the time relay 5 is in the energized state. When T1 arrives, the normally closed contact of the time relay 5 is disconnected, and the normally open contact is energized. At the same time, the right display is blanked, and T2 delay begins. When T2 delay arrives, the normally closed contact of the time relay 5 is re-energized, and the left display is blanked. The single execution working mode ends here. If it is a cyclic working mode, T1 continues to delay, and the above process is repeated to perform delay state conversion.

[0039] In addition, in this embodiment, the counting relay 6 is an electronic counting relay having a set of normally open and normally closed contacts. Figure 3As shown, the positive power supply terminal of the time relay 5 is connected to the positive pole of the power supply, the terminal of the normally closed contact is connected to the positive pole of the vacuum pump, the negative power supply terminal of the time relay 5 is connected to the common terminal of the counting relay 6, and the negative pole of the vacuum pump is also connected to the common terminal of the counting relay 6. The positive and negative power supply terminals of the counting relay 6 are respectively connected to the positive and negative poles of the power supply, and the terminal of the normally closed contact of the counting relay 6 is connected to the negative pole of the power supply. The terminal of the normally closed contact of the time relay 5 is connected to the counting terminal of the counting relay 6, and the ground terminal of the counting relay 6 is connected to the negative pole of the power supply.

[0040] According to the durability test standard, the air filter blockage alarm sensor 7 is subjected to an alternating pressure cycle. Each cycle causes the pressure to rise from zero to the upper limit pressure nominal value, stabilize for 3 seconds, and then drop to zero and stabilize for 3 seconds. This process is one cycle. The test is performed for a total of 10,000 cycles.

[0041] The time delay normally open and normally closed contacts of time relay 5 are set to 3s, and the count times of counting relay 6 are set to 10,000 times, and the count starts from 0. Start the test fixture, the normally closed contact of time relay 5 is connected to the vacuum pump, the vacuum pump works to draw a vacuum, a negative pressure is generated in the circuit of gas pipe 15, the air filter blockage alarm sensor 7 is closed, the indicator light 12 is lit, and it is stable for 3s. After 3s, the normally open contact of time relay 5 is connected, the vacuum pump is powered off and no longer works, the pressure is released in the circuit of gas pipe 15, the air filter blockage alarm sensor 7 no longer works, and the indicator light 12 is extinguished and stable for 3s. After 3s, the normally closed contact of time relay 5 is connected, the vacuum pump works again, and a new test cycle begins. At this time, the counting terminal of counting relay 6 receives a signal, and the count of counting relay 6 is increased by 1. When counting relay 6 counts to 10,000, the normally open contact of counting relay 6 is connected, thereby disconnecting the negative pole of the vacuum pump and time relay 5 from the negative pole of the power supply, so that the vacuum pump and time relay 5 are powered off, and the entire automatic test is completed.

[0042] During the entire test process, the time relay 5 controls the opening and closing time of the vacuum pump, and the electronic counting relay 6 records the number of power-on and power-off times to realize the detection cycle count. In this way, the vacuum holding time, pressure relief holding time, and the number of reciprocating operations can be controlled to achieve accurate testing. During the test, by observing whether the indicator light 12 is lit normally, it is judged whether the air filter blockage alarm sensor 7 is normal. If the indicator light 12 has been working normally after 10,000 cycles, in order to improve the accuracy of the test, the air filter blockage alarm sensor 7 can be checked for mechanical damage, and the internal structure can be disassembled to observe whether it is damaged. At the same time, the air filter blockage alarm sensor 7 can be pressurized to record whether the alarm start value is ±0.6kPa of the nominal alarm value.

[0043] Because it involves the nominal pressure alarm value, in order to ensure that the test is accurate and effective, it is necessary to control the pressure on the air filter blockage alarm sensor 7. In this embodiment, a negative pressure gauge 10 and a gas flow meter 11 are connected to the air supply pipe 15 loop connected to the air pressure regulating valve 4 and the air filter blockage alarm sensor 7 through the air supply pipe 15, respectively. The negative pressure gauge 10 is used to monitor the vacuum pressure, and the gas flow meter 11 is used to detect the vacuum gas flow. After starting the test tooling, the pressure value is monitored by the negative pressure gauge 10 and the gas flow meter 11, so that the pressure in the air supply pipe 15 can be adjusted to the required pressure value through the air pressure regulating valve 4.

[0044] In addition, the present application can also adjust the power of the vacuum pump by means of a vacuum pump voltage regulator 9 electrically connected to the vacuum pump and the power supply, thereby also being able to adjust the pressure in the gas pipe 15 .

[0045] Because there is a possibility that the air filter blockage alarm sensor 7 will randomly fail during the 10,000 test cycles, the test needs to be stopped at this time, which will cause the timing of the time relay 5 to be unable to return to zero, thereby creating obstacles for the next test of the air filter blockage alarm sensor 7. Therefore, the present application can easily reset the set time of the time relay 5 by setting a time relay reset switch 8 connected to the reset terminal of the time relay 5.

[0046] The air filter blockage alarm sensor 7 of the present application is tested with negative pressure, so the vacuum pump draws air through the suction interface 13 and exhausts air through the exhaust interface 14. Therefore, it is also possible to connect the product to be tested with the exhaust interface 14 and leave the suction interface 13 empty, thereby generating positive pressure between the product to be tested and the exhaust interface 14. Therefore, the test tool of the present application can also be adapted to products that need to be tested under positive pressure, and is not limited to the air filter blockage alarm sensor 7 of the present application. It is an automatic durability test tool adapted to positive / negative pressure products.

[0047] The above is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment. It is clear to those skilled in the art that the form in the embodiment is not limited thereto, and the adjustable manner is not limited thereto. It is understood that other improvements and changes directly derived or associated with by those skilled in the art without departing from the basic concept of the present invention should be considered to be included in the protection scope of the present invention.

Claims

1. An automatic test tool for an air filter blockage alarm sensor, characterized in that: Including power supply, vacuum pump, air pressure regulating valve, time relay, counting relay, air filter blockage alarm sensor, The air inlet of the vacuum pump is connected to the air pressure regulating valve through the air supply pipe, and the air pressure regulating valve is connected to the air filter blockage alarm sensor through the air supply pipe; The time relay is a cycle time relay, the positive power supply terminal of the time relay is connected to the positive pole of the power supply, and the negative power supply terminal of the time relay is connected to the common terminal of the counting relay; The terminal of the normally closed contact of the time relay is connected to the positive electrode of the vacuum pump, and the negative electrode of the vacuum pump is connected to the common terminal of the counting relay; The positive power supply terminal of the counting relay is connected to the positive pole of the power supply, the negative power supply terminal is connected to the negative pole of the power supply, and the terminal of the normally closed contact of the counting relay is connected to the negative pole of the power supply.

2. The automatic test tool for air filter blockage alarm sensor according to claim 1, characterized in that: It also includes a negative pressure gauge, which is connected between the air pressure regulating valve and the air filter clogging alarm sensor through an air supply pipe.

3. The automatic test tool for air filter blockage alarm sensor according to claim 1, characterized in that: It also includes a gas flow meter, which is connected between the air pressure regulating valve and the air filter clogging alarm sensor through a gas transmission pipe.

4. The automatic test tool for air filter blockage alarm sensor according to claim 1, characterized in that: It also includes a vacuum pump voltage regulator, which is electrically connected to the vacuum pump and is used to adjust the power of the vacuum pump.

5. The automatic test tool for air filter blockage alarm sensor according to claim 1, characterized in that: It also includes a time relay reset switch electrically connected to the time relay and used for resetting the set time.

6. The automatic test tool for air filter blockage alarm sensor according to claim 1, characterized in that: It also includes a shell, in which the power supply, vacuum pump, air pressure regulating valve, time relay and counting relay are all installed.

7. The automatic test tool for air filter blockage alarm sensor according to claim 6, characterized in that: An air intake interface is fixed on the outer wall of the shell, and one end of the air intake interface on the inner side of the shell is connected to the air pressure regulating valve through an air supply pipe, and one end of the air intake interface located on the outer side of the shell is connected to the air filter blockage alarm sensor through the air supply pipe.

8. The automatic test tool for air filter blockage alarm sensor according to claim 6, characterized in that: An exhaust interface is fixed on the outer wall of the shell, and one end of the exhaust interface on the inner side of the shell is connected to the air outlet of the vacuum pump through an air supply pipe.

9. The automatic test tool for air filter blockage alarm sensor according to claim 1, characterized in that: The air filter clogging alarm sensor is electrically connected to an indicating load for indicating whether the air filter clogging alarm sensor operates normally.

10. The automatic test tool for air filter blockage alarm sensor according to claim 9, characterized in that: The indicating load adopts an indicating lamp.

Images