Electrical circuit for gas tightness detection of flow meter pipe section

Abstract

The utility model provides an electrical circuit for flow meter pipe section air tightness detection. The electrical circuit comprises a hydraulic station motor M1, an alternating current contactor KM1, an alternating current circuit breaker F1, an alternating current circuit breaker F2, an alternating current contactor KM2, a power switch SB0, a 24V switching power supply SWP1, an end button SB1, a pressing button SB2, a relay KA1, a relay KA2, a relay KA3, a relay KA4, a relay KA5, a relay KA6, a hydraulic electromagnetic valve Y1, an oil pressure switch SP1 and an air valve Y2. An electronic air pressure switch SP2; and a time delay switch KT1. The electrical circuit suitable for the pressing device is low in cost, high in reliability, simple in structure, few in required components, low in cost, simple to assemble, convenient to repair and maintain, and capable of quickly forming productivity. Effective control over the electrical equipment of the pressing machine is achieved through relay control logic.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric circuits for detecting air tightness of flow meter pipe sections, in particular to an electric circuit for detecting air tightness of flow meter pipe sections. Background Art

[0002] In the field of ultrasonic water meter / flow meter technology, the pipe sections that make up the instrument need to be pressure tested during the production process to ensure that the final product meets the specified pressure standards. For this reason, each manufacturer has designed corresponding pressure testing equipment according to the needs, and designed a complex control system. The electrical equipment has many components, the installation is complicated, the program debugging cycle is long, it is inconvenient to repair and maintain, and it cannot quickly form productivity. Utility Model Content

[0003] According to the technical problems raised by the above background technology, an electrical circuit for detecting the air tightness of a flow meter pipe section is provided.

[0004] The technical means adopted by the utility model are as follows:

[0005] An electrical circuit for detecting air tightness of a flow meter pipe section, comprising:

[0006] Hydraulic station motor M1, AC contactor KM1, AC circuit breaker F1, AC circuit breaker F2, AC contactor KM2, power switch SB0, 24V switching power supply SWP1, end button SB1, pressure button SB2, relay KA1, relay KA2, relay KA3, relay KA4, relay KA5, relay KA6, hydraulic solenoid valve Y1, oil pressure switch SP1, air valve Y2, electronic air pressure switch SP2, delay switch KT1;

[0007] The 380V power is connected to the input end of the circuit breaker F1, the output end of F1 is connected to the input end of the 220V AC contactor KM1, and the output end of the AC contactor KM1 is connected to the hydraulic station motor M1; the 220V AC power is connected to the input end of the AC circuit breaker F2, and the output end of the AC circuit breaker F2 is connected to the input end of the AC contactor KM2, and the power switch SB0, the coil KM1, and the coil KM2 are connected in series between the AC circuit breaker F2 and the AC contactor KM2;

[0008] The AC contactor KM2 is connected to a 24V switching power supply SWP1; the coil KA1 and the coil KA2 are connected in series after SWP1; the input terminals of the relay KA1 and the relay KA2 are respectively connected to the positive and negative terminals of the 24V output of SWP1; the oil valve A1 of the hydraulic oil valve Y1 is connected to the positive and negative output terminals of the normally closed terminal of the relay KA2, and the oil valve A2 is connected to the positive and negative output terminals of the normally open terminal of the relay KA1;

[0009] One end of the oil pressure switch SP1 is connected in series to the positive pole of the normally open end of the relay KA1; the normally closed input of the relay KA3 is connected to the other end of SP1, and the two ends of the normally open input are respectively connected to the positive and negative poles of the normally open output of the relay KA1; one end of the air valve Y2 is connected to the normally closed output of the relay KA3, and the other end is connected to the negative pole of the normally open output of the relay KA1.

[0010] Furthermore, one end of the electronic air pressure switch SP2 is connected to the positive pole of the normally open output terminal of KA1, and then the relay KA4 is connected in series; the normally open input terminal of relay KA4 is respectively connected to the positive and negative poles of the normally open output terminal of KA1, the normally open output negative terminal is connected in series with one end of relay KA3, the other end of relay KA3 is connected to the positive terminal of KA1 output, the normally open output positive terminal is connected in series with one end of relay KA5, and the other end of relay KA5 is connected to the negative terminal of relay KA1 output; two ends of the normally closed input of relay KA5 are connected to the normally open output positive pole of KA3, one end of the output is connected in series with one end of relay KA6, and the other end of relay KA6 is connected to the negative pole of KA1 output; one end of the normally open end of the delay switch KT1 is connected to the positive pole of the KA3 output terminal, and the other end is connected to two ends of the normally closed input of relay KA6.

[0011] Furthermore, the end button SB1 is a normally closed button and does not have a self-locking function.

[0012] Furthermore, the pressing button SB2 is a normally open button and does not have a self-locking function.

[0013] Furthermore, the power switch SB0 is a button with a self-locking function.

[0014] Furthermore, the delay switch KT1 is a second-pole or split-pole switch.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The utility model provides an electrical circuit with low cost and simple structure, which is suitable for the electrical circuit of the pressure device, requires few components, has low cost, is simple to assemble, and is convenient to repair and maintain, and can quickly form productivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 This is the overall structural diagram of the utility model. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0020] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0021] like Figure 1As shown, the utility model is an electrical circuit for air tightness detection of flow meter pipe sections, mainly including 380V AC power and 220V AC power, wherein the 380V power is connected to the input end of the AC circuit breaker F1, the output end of the AC circuit breaker F1 is connected to the input end of the 220V AC contactor KM1, and the output end of KM1 is connected to the hydraulic station motor M1; the 220V AC power is connected to the input end of the circuit breaker F2, and the output end of F2 is connected to the input end of the AC contactor KM2, and the power switch SB0, AC contactor KM1, and AC contactor KM2 are connected in series between the AC circuit breaker F2 and the AC contactor KM2; the AC contactor KM2 is connected to a 24V switching power supply SWP1; the end button SB1 is a normally closed button, the pressure button SB2 is a normally open button, and the relay KA1 and the relay KA2 are connected in series after SWP1. The two input ends of relay KA1 and relay KA2 are connected to the positive and negative ends of SWP1 24V output respectively; the oil valve A1 of hydraulic oil valve Y1 is connected to the positive and negative poles of relay KA2 normally closed output, and the oil valve A2 is connected to the positive and negative poles of relay KA1 normally open output. One end of oil pressure switch SP1 is connected in series to the positive pole of relay KA1 normally open; the normally closed input of relay KA3 is connected to the other end of SP1, and the two normally open input ends are connected to the positive and negative poles of KA1 normally open output respectively; one end of air valve Y2 is connected to the normally closed output of KA3, and the other end is connected to the negative pole of KA1 normally open output. One end of the electronic air pressure switch SP2 is connected to the positive pole of the normally open output terminal of KA1, and then the coil KA4 is connected in series; the normally open input terminal of relay KA4 is respectively connected to the positive and negative poles of the normally open output terminal of relay KA1, the normally open output negative terminal is connected in series with one end of relay KA3, the other end of relay KA3 is connected to the positive output terminal of relay KA1, the normally open output positive terminal is connected in series with one end of relay KA5, and the other end of relay KA5 is connected to the negative output terminal of relay KA1; the normally closed input terminals of relay KA5 are connected to the normally open output positive pole of relay KA3, one end of the output is connected in series with one end of coil KA6, and the other end of relay KA6 is connected to the negative output pole of relay KA1; one end of the normally open end of the delay switch KT1 is connected to the positive pole of the output terminal of relay KA3, and the other end is connected to the normally closed input terminals of relay KA6.

[0022] As a preferred embodiment, in the present application, in the electrical circuit, when the power switch SB0 is pressed, the coils of the AC contactor KM1 and the AC contactor KM2 are energized. At this time, the hydraulic station motor M1 works, the hydraulic station produces pressure, and the 24V switching power supply SWP1 works to output 24V DC; the relay KA2 that controls the oil valve A1 is not energized, the normally closed contact of the relay KA2 is in the conducting state, the oil valve A1 is opened, and the contraction pressure can be provided for the hydraulic cylinder of the press, and the relay KA1 is not energized, the normally open contact of the relay KA1 is not closed, and the oil valve A2 is closed.

[0023] After the pressing button SB2 is pressed, the relays KA1 and KA2 are energized, the relays KA1 and KA2 are energized, the pressing button SB2 is self-locked, the A1 end of the hydraulic solenoid valve Y1 is closed and the A2 end is opened, providing the extension pressure for the pressing machine cylinder. At the same time, the oil pressure switch SP1 is energized, and the pressure of the oil pressure switch SP1 rises. At this time, the coil KA3 is not energized and is in the disconnected state. The gas valve Y2 is energized to start inflating and pressurizing the flow meter pipe section. Since the electronic air pressure switch SP2 is set to the high-pressure on and low-pressure off mode, when the pressure in the flow meter pipe section rises to the specified pressure (for example, 1Mpa), the electronic air pressure switch SP2 is turned on, the relay KA4 is energized, the relay KA4 is energized, the relay KA3 and the relay KA5 are energized, the relay KA3 and the relay KA5 are energized, the relay KA3 is self-locked, and the gas valve Y2 loses power and the valve is closed. Assuming that there is no leakage in the route, the relay KA5 is disconnected, the relay KA6 is energized, the delay switch KT1 is energized to start timing, and after KT1 expires, the switch closes and the relay KA6 is energized. When there is a leak in the flow meter pipe section, because the electronic air pressure switch SP2 is set for low-pressure disconnection operation, SP2 will be disconnected, and relay KA4 will be disconnected, relay KA5 will lose power, and relay KA6 will be disconnected.

[0024] When the end button SB1 is pressed, the relays KA1 and KA2 lose power, and the relays KA1 and KA2 are disconnected. The subsequent circuit of relay KA1 has no power, and all related components do not work; the A1 end of the hydraulic solenoid valve Y1 is opened and the A2 end is closed to provide contraction pressure for the hydraulic cylinder of the press.

[0025] As a preferred implementation, SB0 is a button with a self-locking function. When pressed, the AC contactors KM1 and KM2 are energized and attracted, the hydraulic station motor M1 works to produce pressure for the hydraulic station, and the switching power supply SWP1 produces DC power.

[0026] In this embodiment, when the end button SB1 is pressed, only the normally closed contact of the relay KA2 is turned on and the oil valve A1 of the hydraulic solenoid valve Y1 is turned on to control the retraction of the oil cylinder, while other electrical components are not powered and do not work.

[0027] In this embodiment, after the pressing button SB2 is pressed, the coil KA1 and the coil KA2 are energized and both are attracted, SB2 is self-locking, the A1 end of the hydraulic solenoid valve Y1 is powered off and the A2 end is powered, providing extension pressure for the pressing machine cylinder. At the same time, the oil pressure switch SP1 is energized, and the pressure of the oil pressure switch SP1 rises. At this time, the coil KA3 is not energized and the relay KA3 is not attracted, the normally closed contact is turned on, and the air valve Y2 is energized to start inflating and pressurizing the flow meter pipe section. Since the electronic air pressure switch SP2 is set to a high-pressure on and low-pressure off mode, when the pressure in the flow meter pipe section rises to a specified pressure (such as 1Mpa), the electronic air pressure switch SP2 is turned on, the coil KA4 is energized and the relay KA4 is attracted, the coil KA3 and the coil KA5 are energized and the relays KA3 and KA5 are attracted, and the coil KA3 is self-locking, and the air valve Y2 loses power and the valve is closed. Assuming that there is no air pressure leakage in the flow meter pipe section, the relay KA5 is disconnected, the relay KA6 is energized, the delay switch KT1 is energized to start timing, and after KT1 expires, the switch is closed and the relay KA6 is energized. When there is air pressure leakage in the flow meter pipe section, because the electronic air pressure switch SP2 is set to low-pressure disconnection operation, SP2 will be disconnected, the coil KA4 will be disconnected, the coil KA5 will be de-energized, the relay KA5 will be disconnected, and the coil KA6 will be de-energized and the relay KA6 will be disconnected.

[0028] In this embodiment, for ease of use, an alarm light may be added to the circuit, the sound and light signal wiring may be connected to relay KA5 and relay KA6, and the common ground terminal may be connected to KA1.

[0029] In this embodiment, the electronic air pressure switch SP2 uses an electronic switch with high precision (within 0.5%), adjustable high and low pressure values, and adjustable high and low pressure on and off. The air valve Y2 can also be replaced by a water valve, and the electronic air pressure switch SP2 can also be replaced by an electronic water valve.

[0030] In this embodiment, the delay switch KT1 can be a second-pole or split-pole switch.

[0031] In this embodiment, the power switch SB0 should use a button with a self-locking function, and the end button SB1 and the press button SB2 should use normally closed and normally open buttons without a self-locking function.

[0032] The serial numbers of the above embodiments of the utility model are only for description and do not represent the advantages and disadvantages of the embodiments. In the above embodiments of the utility model, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments. In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An electrical circuit for detecting the air tightness of a flow meter pipe section, characterized in that: include: Hydraulic station motor M1, AC contactor KM1, AC circuit breaker F1, AC circuit breaker F2, AC contactor KM2, power switch SB0, 24V switching power supply SWP1, end button SB1, pressure button SB2, relay KA1, relay KA2, relay KA3, relay KA4, relay KA5, relay KA6, hydraulic solenoid valve Y1, oil pressure switch SP1, air valve Y2, electronic air pressure switch SP2, delay switch KT1; The 380V power is connected to the input end of the circuit breaker F1, the output end of F1 is connected to the input end of the 220V AC contactor KM1, and the output end of the AC contactor KM1 is connected to the hydraulic station motor M1; the 220V AC power is connected to the input end of the AC circuit breaker F2, and the output end of the AC circuit breaker F2 is connected to the input end of the AC contactor KM2, and the power switch SB0, the coil KM1, and the coil KM2 are connected in series between the AC circuit breaker F2 and the AC contactor KM2; The AC contactor KM2 is connected to a 24V switching power supply SWP1; the coil KA1 and the coil KA2 are connected in series after the 24V switching power supply SWP1; the input terminals of the relay KA1 and the relay KA2 are respectively connected to the positive and negative terminals of the 24V output of the 24V switching power supply SWP1; the oil valve A1 of the hydraulic solenoid valve Y1 is connected to the positive and negative output terminals of the normally closed terminal of the relay KA2, and the oil valve A2 is connected to the positive and negative output terminals of the normally open terminal of the relay KA1; One end of the oil pressure switch SP1 is connected in series to the positive pole of the normally open end of the relay KA1; the normally closed input of the relay KA3 is connected to the other end of SP1, and the two ends of the normally open input are respectively connected to the positive and negative poles of the normally open output of the relay KA1; one end of the air valve Y2 is connected to the normally closed output of the relay KA3, and the other end is connected to the negative pole of the normally open output of the relay KA1.

2. An electrical circuit for detecting air tightness of a flow meter pipe section according to claim 1, characterized in that: One end of the electronic air pressure switch SP2 is connected to the positive pole of the normally open output terminal of relay KA1, and then connected in series with relay KA4; the normally open input terminal of relay KA4 is respectively connected to the positive and negative poles of the normally open output terminal of relay KA1, the normally open output negative terminal is connected in series with one end of relay KA3, the other end of relay KA3 is connected to the positive output terminal of relay KA1, the normally open output positive terminal is connected in series with one end of relay KA5, and the other end of relay KA5 is connected to the negative output terminal of relay KA1; two ends of the normally closed input of relay KA5 are connected to the normally open output positive pole of relay KA3, one end of the output is connected in series with one end of relay KA6, and the other end of relay KA6 is connected to the negative output pole of relay KA1; one end of the normally open end of the delay switch KT1 is connected to the positive pole of the output terminal of relay KA3, and the other end is connected to two ends of the normally closed input of relay KA6.

3. The electrical circuit for detecting air tightness of a flow meter pipe section according to claim 1, characterized in that: The end button SB1 is a normally closed button and does not have a self-locking function.

4. The electrical circuit for detecting air tightness of a flow meter pipe section according to claim 1, characterized in that: The pressing button SB2 is a normally open button and does not have a self-locking function.

5. The electrical circuit for detecting air tightness of a flow meter pipe section according to claim 1, characterized in that: The power switch SB0 is a button with a self-locking function.

6. The electrical circuit for detecting air tightness of a flow meter pipe section according to claim 1, characterized in that: The time delay switch KT1 is a second-pole or split-pole switch.

Images