Pump vacuum degree testing device

Abstract

A pump vacuum degree testing device comprises a power source, a pressure switch, a first relay, a second relay, a starting switch, a time relay and a qualified indicator light, the power source comprises a direct current output end, and the pressure switch comprises a measuring pipeline structure, a first output switch and a second storage switch. The pressure switch further comprises a switch threshold setting device and a power supply end, the time relay comprises a control circuit, an output circuit, a power supply end and a delay setting device, and a measuring pipeline interface of the pressure switch is connected with an air inlet end of the vacuum pump to be measured through an air pipeline. The vacuum degree of the vacuum pump is tested by arranging the vacuum sensor, the relay is used for controlling the power supply of the vacuum pump and the timing of the time relay, after starting, other tests are automatically completed, errors caused by manual reading are avoided, test conditions are consistent, and meanwhile, qualification judgment is given.

Description

TECHNICAL FIELD

[0001] The utility model relates to physical field especially relates to vacuum degree measurement technology, and particularly is a pump vacuum degree testing device. BACKGROUND

[0002] In prior art, the vacuum degree of micro pump is tested by manual vacuum gun, and the test process requires that the vacuum degree does not drop below-2.5Kpa within 300 seconds, since there is error in manual timing and vacuum gun reading, it is easy to cause inconsistent test conditions, and manual test efficiency is low. SUMMARY

[0003] The utility model discloses a pump vacuum degree testing device, and the pump vacuum degree testing device solves the technical problem of inconsistent manual test conditions and low operation efficiency in prior art.

[0004] The utility model discloses a pump vacuum degree testing device, and the pump vacuum degree testing device solves the technical problem of inconsistent manual test conditions and low operation efficiency in prior art.The utility model discloses a pump vacuum degree testing device, which comprises a power supply, a pressure switch, a first relay, a second relay, a starting switch, a time relay and a qualified indicator lamp, wherein the power supply comprises a direct current output end, the pressure switch comprises a measuring pipeline structure, a first output switch and a second storage switch, and the pressure switch further comprises a switch threshold setting device and a power supply end, the time relay comprises a control circuit, an output circuit, a power supply end and a time delay setting device, the measuring pipeline interface of the pressure switch is connected with the air inlet end of the vacuum pump to be tested through an air pipeline, the power input end of the pressure switch is connected with the direct current output end of the power supply, the direct current output end of the power supply, the first output switch of the pressure switch and the coil of the first relay form a first control loop, the direct current output end of the power supply, the second output switch of the pressure switch and the coil of the second relay form a second control loop, the direct current output end of the power supply, the starting switch, the normally closed contact of the first relay and the power input end of the vacuum pump to be tested are connected in series, the power supply end of the time relay is connected with the direct current output end of the power supply, one end of the normally open contact of the second relay is connected with the positive electrode of the direct current output end of the power supply 1, the other end of the normally open contact of the second relay is connected with one end of the control circuit of the time relay, the other end of the control circuit of the time relay is grounded, one end of the output circuit of the time relay is connected with the positive electrode of the direct current output end of the power supply, the other end of the output circuit of the time relay is connected with one end of the qualified indicator lamp, and the other end of the qualified indicator lamp is connected with the negative electrode of the power supply.

[0005] Further, the measuring pipeline interface of the pressure switch is connected with one end of a tee joint through an air pipeline, the other two ends of the tee joint are connected with one end of a first ball valve and one end of a second ball valve through pipelines respectively, the other end of the first ball valve is connected with one end of a buffer tank, the other end of the buffer tank is connected with the air inlet end of the vacuum pump to be tested through an air pipeline, and the other end of the second ball valve is connected with the atmosphere.

[0006] Further, the pressure switch, the start switch, the time relay and the qualified indicator lamp are installed on the front side of the shell, the front side of the shell is provided with a pump power interface, the power input end of the vacuum pump to be measured is connected with the pump power interface through a wire, and the power input end of the vacuum pump to be measured is connected with the output end of the power supply, the start switch and the normally closed contact of the first relay through the pump power interface to form a series circuit.

[0007] Further, the pressure switch is a ZSE30AF-01-B-L type.

[0008] Further, the time relay is a VLC-Timer-R-2 type.

[0009] Compared with the prior art, the effect of the utility model is positive and obvious. The utility model tests the vacuum degree of the pump through the vacuum sensor, controls the power supply of the vacuum pump and the timing of the time relay through the relay, and automatically completes the remaining test after starting, so that the error of manual reading is avoided, the test conditions are consistent, and the qualified determination is given. BRIEF DESCRIPTION OF DRAWINGS

[0010] Fig. 1 is the schematic view of the utility model.

[0011] Fig. 2 is the front view of the utility model.

[0012] Fig. 3 is the circuit schematic view of the utility model.

[0013] Marked in the figure: 1, power supply; 101, positive electrode; 102, negative electrode; 103, 220V alternating current power supply; 104, transformer; 105, power switch; 106, power indicator lamp; 2, pressure switch; OUT1, first output switch; OUT2, second output switch; KA1, first relay; KA2, second relay; 3, start switch; 4, time relay; 5, qualified indicator lamp; 6, three-way joint; 7, first ball valve; 8, second ball valve; 9, buffer tank; 10, shell; 11, pump power interface; 12, vacuum pump to be measured. DETAILED DESCRIPTION

[0014] The utility model will be further described below in combination with the drawings and examples, but it is not limited to the utility model.

[0015] As Figs. 1-3As shown, the utility model discloses a kind of pump vacuum degree testing device, including power supply 1, pressure switch 2, first relay KA1, second relay KA2, starting switch 3, time relay 4, qualified indicator lamp 5, power supply 1 includes DC output end, pressure switch 2 includes a measuring pipeline interface, a first output switch OUT1, a second output switch OUT2, pressure switch 2 also includes switch threshold setting device and power supply end, time relay 4 includes control circuit, output circuit, power supply end and delay setting device, the measuring pipeline interface of pressure switch 2 is connected with the air inlet end of the vacuum pump 12 to be measured by air pipeline, the power supply end of pressure switch 2 is connected with the DC output end of power supply 1, the DC output end of power supply 1, the first output switch OUT1 of pressure switch 2, the coil of first relay KA1 constitutes first control loop, the DC output end of power supply 1, the second output switch OUT2 of pressure switch 2, the coil of second relay KA2 constitutes second control loop, the DC output end of power supply 1, starting switch 3 and the normally closed contact of first relay KA1, the power supply input end of vacuum pump 12 to be measured are connected in series, the power supply end of time relay 4 is connected with the DC output end of power supply 1, one end of the normally open contact of second relay KA2 is connected with the positive pole 101 of the DC output end of power supply 1, the other end of the normally open contact of second relay KA2 is connected with one end of the control circuit of time relay 4, the other end of the control circuit of time relay 4 is grounded, one end of the output circuit of time relay 4 is connected with the positive pole 101 of the DC output end of power supply 1, the other end of the output circuit of time relay 4 is connected with one end of qualified indicator lamp 5, the other end of qualified indicator lamp 5 is connected with the negative pole 102 of power supply 1.

[0016] Further, the power supply 1 includes 220V AC power supply 103, transformer 104, rectifier circuit (not shown in the figure), power switch 105, power indicator lamp 106, 220V AC power supply 103 is connected with the primary coil of transformer 104, the secondary coil of transformer 104 is connected with the input end of rectifier circuit, the output end of rectifier circuit, power switch 105, power indicator lamp 106 constitute series circuit, the two ends of power indicator lamp 106 are the output end of power supply 1, and the output end of power supply 1 outputs 24V DC power supply. Alternatively, the power supply 1 can adopt the 24V switching power supply in the prior art.

[0017] Specifically, 220V AC power supply is converted to 24V DC power supply used inside the device by transformer 104 and rectifier circuit, when power switch 105 is closed, the DC output end of power supply 1 is electrified, power indicator lamp 106 is bright, when power switch 105 is disconnected, the output end of power supply 1 is de-energized, power indicator lamp 106 is extinguished, and the control of the DC output end of power supply 1 can be realized.

[0018] Further, the measuring pipe interface of the pressure switch 2 is connected with one end of a tee joint 6 through an air pipe, the other two ends of the tee joint 6 are respectively connected with one end of a first ball valve 7 and one end of a second ball valve 8 through pipes, the other end of the first ball valve 7 is connected with one end of a buffer tank 9, the other end of the buffer tank 9 is connected with the gas inlet end of the vacuum pump 12 to be tested through an air pipe, and the other end of the second ball valve 8 is connected with the atmosphere.

[0019] Specifically, the buffer tank 9 is arranged to absorb the pressure fluctuation in the vacuum system, so as to prevent the pressure fluctuation from affecting the signal output of the pressure switch 2, the first ball valve 7 is connected with the switch of the pressure switch 2 for the vacuum test pipe, and the second ball valve 8 is used as a switch for manual pressure relief after the test, and the second ball valve 8 can be opened for pressure relief.

[0020] Further, the housing 10 is further provided, the pressure switch 2, the start switch 3, the time relay 4 and the qualified indicator lamp 5 are installed on the front side of the housing 10, the front side of the housing 10 is provided with a pump testing power supply interface 11, the power input end of the vacuum pump 12 to be tested is connected with the pump testing power supply interface 11 through a wire, and the power input end of the vacuum pump 12 to be tested is connected with the output end of the power supply 1, the start switch 3 and the normally closed contact point group of the first relay KA1 through the pump testing power supply interface 11 to form a series circuit.

[0021] Specifically, the pressure switch 2, the start switch 3, the time relay 4 and the qualified indicator lamp 5 are installed on the front side of the housing 10, so as to facilitate observation and reading and operation, and the pump testing power supply interface 11 is arranged to facilitate quick connection of the power supply end of the vacuum pump 12 to be tested. In addition, the power switch 105 and the power indicator lamp 106 can also be arranged on the front side of the housing 10, so as to facilitate operation and observation of the power supply 105.

[0022] Further, the model of the pressure switch 2 is ZSE30AF-01-B-L.

[0023] Further, the model of the time relay 4 is VLC-Timer-R-2.

[0024] In the embodiment, before the test, the trigger pressure of the first output switch OUT1 is set to be <-9KPa and the trigger pressure of the second output switch OUT2 is set to be -2.5KPa to -5KPa through the switch threshold setting device of the pressure switch 2.

[0025] The power input end of the to-be-tested vacuum pump 12 is connected with the pump power interface 11 through a wire, the gas inlet end of the to-be-tested vacuum pump 12 is connected with one end of the buffer tank 9, the first ball valve 7 is opened, the second ball valve 8 is closed, the power switch 105 is opened, the power indicator light 106 is bright, then the starting switch 3 is closed, the to-be-tested vacuum pump 12 is powered on and started, the pressure switch 2 detects the pressure data of the gas inlet of the to-be-tested vacuum pump 12, when the pressure detected by the pressure switch 2 reaches-9KPa, the first output switch OUT1 of the pressure switch 2 is closed, the coil of the first relay KA1 is powered on, the normally closed contact of the first relay KA1 is disconnected, the to-be-tested vacuum pump 12 is powered off, and the pressure maintaining mode is entered. After entering the pressure maintaining mode, the negative pressure of the gas inlet of the to-be-tested vacuum pump 12 decreases, when the value detected by the pressure switch 2 is in the range of-2.5KPa~ -5KPa, the second output switch OUT2 of the pressure switch 2 is closed, the coil of the second relay KA2 is powered on, the normally open contact of the second relay KA2 is closed, and the time relay 4 starts timing, if the timing is not full 300 seconds, the data detected by the pressure switch 2 has exceeded the range of-2.5KPa~ -5KPa, the normally open contact of the second relay KA2 is disconnected, then the time relay 4 is reset, the qualified indicator light 5 cannot be triggered, and it can be determined that the air tightness of the to-be-tested vacuum pump 12 is unqualified; if the data detected by the pressure switch 2 is still in the range of-2.5KPa~ -5KPa, the normally open contact of the second relay KA2 remains closed, until the time relay 5 is timed for 300 seconds, the output circuit of the time relay 5 is connected, the qualified indicator light 5 is bright, and it can be determined that the air tightness of the to-be-tested vacuum pump 12 is qualified.

[0026] In the vacuum pumping stage of the to-be-tested vacuum pump 12, the negative pressure value will quickly increase from 0KPa to-9KPa, although this process coincides with the triggering pressure-2.5KPa~ -5KPa of the second output switch OUT2 of the pressure switch 2, but since the time in this range is very short, far less than 300 seconds, the time relay 4 needs to keep timing state in the state that the normally open contact of the second relay KA2 is always closed, once the normally open contact of the second relay KA2 is disconnected, the time relay 4 will reset, therefore, no misjudgment will be caused.

Claims

1. A pump vacuum degree testing device, characterized in that: The system includes a power supply, a pressure switch, a first relay, a second relay, a start switch, a time relay, and a pass indicator light. The power supply includes a DC output terminal. The pressure switch includes a measuring pipe structure, a first output switch, a second storage switch, and a switch threshold setting device and a power supply terminal. The time relay includes a control circuit, an output circuit, a power supply terminal, and a delay setting device. The measuring pipe interface of the pressure switch is connected to the air inlet of the vacuum pump under test via an air pipe. The power input terminal of the pressure switch is connected to the DC output terminal of the power supply. The DC output terminal of the power supply, the first output switch of the pressure switch, and the coil of the first relay form a first control circuit. The second output switch of the force switch and the coil of the second relay form the second control circuit. The DC output terminal of the power supply, the start switch, the normally closed contact of the first relay, and the power input terminal of the vacuum pump under test are connected in series. The power supply terminal of the time relay is connected to the DC output terminal of the power supply. One end of the normally open contact of the second relay is connected to the positive terminal of the DC output terminal of the power supply. The other end of the normally open contact of the second relay is connected to one end of the control circuit of the time relay. The other end of the control circuit of the time relay is grounded. One end of the output circuit of the time relay is connected to the positive terminal of the DC output terminal of the power supply. The other end of the output circuit of the time relay is connected to one end of the qualified indicator light. The other end of the qualified indicator light is connected to the negative terminal of the power supply.

2. The pump vacuum degree testing device as described in claim 1, characterized in that: The measuring pipe interface of the pressure switch is connected to one end of a tee connector via an air pipe. The other two ends of the tee connector are respectively connected to one end of a first ball valve and one end of a second ball valve via pipes. The other end of the first ball valve is connected to one end of a buffer tank. The other end of the buffer tank is connected to the air inlet of the vacuum pump under test via an air pipe. The other end of the second ball valve is connected to the atmosphere.

3. The pump vacuum degree testing device as described in claim 1, characterized in that: It also includes a housing. The pressure switch, start switch, time relay, and qualification indicator light are installed on the front side of the housing. A pump test power interface is provided on the front side of the housing. The power input terminal of the vacuum pump under test is connected to the pump test power interface through a wire. The power input terminal of the vacuum pump under test is connected to the power output terminal, start switch, and normally closed contact of the first relay through the pump test power interface to form a series circuit.

4. The pump vacuum degree testing device as described in claim 1, characterized in that: The pressure switch is model ZSE30AF-01-BL.

5. The pump vacuum degree testing device as described in claim 1, characterized in that: The time relay is model VLC-Timer-R-2.

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