CN216145556U - Overload relay - Google Patents
Overload relay Download PDFInfo
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- CN216145556U CN216145556U CN202121645875.9U CN202121645875U CN216145556U CN 216145556 U CN216145556 U CN 216145556U CN 202121645875 U CN202121645875 U CN 202121645875U CN 216145556 U CN216145556 U CN 216145556U
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Abstract
The utility model discloses an overload relay which comprises a time delay reversal module, a multiplying power selection module, a voltage comparison module, a full load hysteresis module and an alarm module. The fully-loaded hysteresis module comprises a first resistor group, a second resistor group, a third resistor group, a fourth resistor group and a capacitor group, wherein the resistor groups are sequentially connected in series and then connected in series with the capacitor group, the first resistor group is connected with an input signal, a plurality of resistors are arranged in each resistor group and connected in series, the capacitor group comprises a first capacitor and a second capacitor, the first capacitor and the second capacitor are connected in parallel, and the cathodes of the first capacitor and the second capacitor are grounded; the utility model combines the inverse time-limit curve running mode by connecting the multi-path selection switch and the multi-path resistance-capacitance charging and discharging delay circuit in parallel, and has more combined modes and strong overload protection capability.
Description
Technical Field
The utility model relates to the technical field of relays, in particular to an overload relay.
Background
The relay has a control system and a controlled system, and has the function of a protection circuit, and can be automatically disconnected when the relay senses the fluctuation of voltage or current in equipment, so that the equipment is protected from being damaged. However, at the instant of starting the device, a reverse electromotive force is generated to increase the current instantly, and the relay is opened and closed continuously, so that the device is jumped frequently. In addition, in the production process, when the equipment is required to be in short-time load operation, the current value in the circuit exceeds a fixed value, and the relay is also continuously opened and closed.
The patent number is CN201620776907.1 utility model patent of overload protection type relay, which comprises a voltage comparison module, a time delay reversal selection module and an overload multiplying power selection module. The delay inversion selection module comprises a capacitor and a plurality of resistors, each resistor is sequentially connected in series and then connected in series with the capacitor, the negative electrode of the capacitor is grounded, a delay selection switch connected with an external load input signal is arranged at the front end of each resistor, the external load input signal is connected with different delay selection switches, different resistors are selected to charge the capacitor, and the selection of the capacitor charging time is realized. The overload multiplying power selection module comprises a plurality of resistors connected in series, an overload multiplying power selection switch connected with an external load input voltage signal is arranged at the front end of each resistor, the external load input signal is connected with different overload multiplying power selection switches, namely different resistors are selected for voltage division, and overload multiplying power selection is achieved. Although the delay reversing module realizes the selection of different delay times according to equipment conditions, the overload multiplying power selection module does not realize the function, and in addition, the overload multiplying power selection module has fewer selectable modes and has certain limitation in the use process.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model provides an overload relay which comprises a time delay reversal module, a multiplying power selection module, a voltage comparison module, a full load hysteresis module and an alarm module. The full-load hysteresis module comprises a first resistor group, a second resistor group, a third resistor group, a fourth resistor group and a capacitor group, wherein the resistor groups are sequentially connected in series and then connected in series with the capacitor group, the first resistor group is connected with an input signal, a plurality of resistors are arranged in each resistor group, each resistor is connected in series, the capacitor group comprises a first capacitor and a second capacitor, the first capacitor and the second capacitor are connected in parallel, and the cathodes of the first capacitor and the second capacitor are grounded; the first resistor group is connected with a third selection switch in parallel, the second resistor group is connected with a second selection switch in parallel, and the third resistor group is connected with a first selection switch in parallel; the second capacitor is connected with a fourth selection switch in series, and the fourth selection switch is connected with the first capacitor in parallel; the output end of the multiplying power selection module is connected with the input end of the full-load hysteresis module, and the output end of the full-load hysteresis module is connected with the voltage comparison module. The utility model combines the inverse time-limit curve running mode by connecting the multi-path selection switch and the multi-path resistance-capacitance charging and discharging delay circuit in parallel, and has more combined modes and strong overload protection capability.
The utility model solves the technical problem, and adopts the following technical scheme:
an overload relay comprises a time delay reversal module, a multiplying power selection module, a voltage comparison module, a full load hysteresis module and an alarm module;
the fully-loaded hysteresis module comprises a first resistor group, a second resistor group, a third resistor group, a fourth resistor group and a capacitor group, wherein the resistor groups are sequentially connected in series and then connected in series with the capacitor group, the first resistor group is connected with an input signal, a plurality of resistors are arranged in each resistor group and connected in series, the capacitor group comprises a first capacitor and a second capacitor, the first capacitor and the second capacitor are connected in parallel, and the cathodes of the first capacitor and the second capacitor are grounded;
the first resistor group is connected with a third selection switch in parallel, the second resistor group is connected with a second selection switch in parallel, and the third resistor group is connected with a first selection switch in parallel;
the second capacitor is connected with a fourth selection switch in series, and the fourth selection switch is connected with the first capacitor in parallel;
the output end of the multiplying power selection module is connected with the input end of the full-load hysteresis module, and the output end of the full-load hysteresis module is connected with the voltage comparison module.
Furthermore, the voltage comparison module comprises a first voltage comparator and a second voltage comparator, the output end of the third resistor group and the output end of the first selection switch are both connected with the input end of the first voltage comparator, the < - > ends of the first voltage comparator and the second voltage comparator input the same reference voltage signal, the input end of the second voltage comparator is connected with the output end of the delay inversion module, and the output ends of the first voltage comparator and the second voltage comparator are both connected with the input end of the alarm module.
Furthermore, the device also comprises a voltage acquisition module and a voltage amplification module, wherein the output end of the voltage acquisition module is connected with the input end of the voltage amplification module, and the input end of the time delay reversal module and the input end of the multiplying power selection module are both connected with the output end of the voltage amplification module.
Further, the first capacitor and the second capacitor have a capacitance of 100 μ F.
The voltage amplification circuit further comprises a range selection module, wherein the range selection module comprises a plurality of resistors connected in series, each resistor is connected with a selection switch in parallel, the input end of the range selection module is connected with the output end of the voltage amplification module, and the input end of the delay inversion module and the input end of the multiplying power selection module are connected with the output end of the range selection module.
Further, the rated value of the input signal is in the range of 20mv-60 mv.
Furthermore, the device also comprises a quick-acting loop module, wherein the input end of the quick-acting loop module is connected with the output end of the multiplying power selection module, and the output end of the quick-acting loop module is connected with the input end of the alarm module.
In summary, due to the adoption of the technical scheme, the utility model has the beneficial effects that:
according to the overload relay provided by the utility model, the overload multiplying power selection module in the prior art comprises a plurality of resistors which are connected in series, the front end of each resistor is provided with an overload multiplying power selection switch connected with an external load input voltage signal, on the basis that the external load input signal is connected with different overload multiplying power selection switches, a full-load hysteresis module is added, the output end of the load multiplying power selection module is connected with the input end of the full-load hysteresis module, a combined mode is added, the selectivity is higher in the using process, and the overload protection capability is stronger.
Drawings
The utility model will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a system block diagram of an overload relay provided by the present invention;
FIG. 2 is a circuit diagram of a fully loaded hysteresis module provided by the present invention;
FIG. 3 is a table showing the relationship between the selector switch of the fully loaded hysteresis module and the nominal value of 2.5 times and the delay time according to the present invention;
FIG. 4 is a circuit diagram of a range selection module provided by the present invention;
fig. 5 is a table showing the relationship between the selection switches of the range selection module and the nominal values of the input signals.
Detailed Description
The present invention will be described in detail with reference to fig. 1 to 5.
An overload relay comprises a time delay reversal module, a multiplying power selection module, a voltage comparison module, a full load hysteresis module and an alarm module. The full-load hysteresis module comprises a first resistor group 110, a second resistor group 130, a third resistor group 150, a fourth resistor group 170 and a capacitor group 190, wherein the resistor groups are sequentially connected in series and then connected in series with the capacitor group 190, the first resistor group 110 is electrically connected with an input signal, a plurality of resistors are arranged in the resistor groups, each resistor in each resistor group is sequentially connected in series, the capacitor group 190 comprises a first capacitor C1 and a second capacitor C2, the first capacitor C1 is connected with the second capacitor C2 in parallel, and the cathodes of the first capacitor C1 and the second capacitor C2 are all grounded.
The first resistor group 110 is connected with a third selection switch S3 in parallel, the second resistor group 130 is connected with a second selection switch S2 in parallel, and the third resistor group 150 is connected with a first selection switch S1 in parallel; the second capacitor C2 is connected in series with a fourth selection switch S4, the fourth selection switch S4 is connected in parallel with the first capacitor C1, and the capacitance values of the first capacitor C1 and the second capacitor C2 are the same. When the fourth selection switch S4 is closed, the first capacitor C1 and the second capacitor C2 operate simultaneously, and the total capacitance is doubled, and the delay time is twice that when the fourth selection switch S4 is opened, in this embodiment, the capacitance of the first capacitor C1 and the capacitance of the second capacitor C2 are 100 μ F respectively. The output end of the multiplying power selection module is connected with the input end of the full-load hysteresis module, and the output end of the full-load hysteresis module is connected with the voltage comparison module. The operator can select the multiple needed to be set through the multiplying power selection module, and then corresponding opening or closing operations are carried out on the selection switches S1 to S4, and the action time of the relay is delayed by connecting different numbers of resistors R1-R9 into the circuit. Referring to fig. 3, for example, the magnification selection module is adjusted to 2.5 times, the selection switches S1 to S3 are closed, the selection switch S4 is opened, the delay time of the fully loaded hysteresis module is 17.7S, and if the selection switch S4 is also closed, the delay time is extended by one time, i.e., 35.4S.
Further, the voltage comparison module includes a first voltage comparator IC1 and a second voltage comparator, an output end of the third resistor group 150 and an output end of the first selection switch S1 are connected in parallel and then connected with an input end of the first voltage comparator IC1, negative electrodes "-" of the first voltage comparator IC1 and the second voltage comparator are both inputted with the same reference voltage signal, an input end of the second voltage comparator is connected with an output end of the delay inversion module, and output ends of the first voltage comparator IC1 and the second voltage comparator are both connected with an input end of the alarm module. When the voltage at the positive electrode "+" end of the first voltage comparator IC1 is greater than the reference voltage V0 at the negative electrode "-" end, the external load is indicated to exceed the range of the first voltage comparator IC1 which can be loaded, the relay enters an inverse time limit timing state, and when a set inverse time limit timing value is reached, the alarm module gives out an alarm or lights up, and meanwhile, the contact of the relay acts. In this embodiment, the alarm module is an alarm indicator light.
It should be noted here that the relay is further provided with a reset button, the alarm module is further provided with an action indicating lamp, when an input signal of the relay is restored to a normal value from a large value, the alarm indicating lamp is turned off, but the action indicating lamp is kept in a normally-on state, the output relay is still in an action state, a worker is required to press the reset button and keep the reset button for more than 1 second, the action indicating lamp is turned off, and meanwhile, a contact of the relay returns.
Furthermore, the device also comprises a voltage acquisition module and a voltage amplification module, wherein the output end of the voltage acquisition module is connected with the input end of the voltage amplification module, and the input end of the time delay reversal module and the input end of the multiplying power selection module are both connected with the output end of the voltage amplification module.
As another embodiment, the overload relay is further provided with a range selection module, the range selection module is specifically connected behind the voltage amplification module, the input end of the range selection module is connected with the output end of the voltage amplification module, and the input end of the delay reversal module and the input end of the magnification selection module are both connected with the output end of the range selection module. As shown in fig. 4, the range selection module includes a plurality of resistors connected in series, and in this embodiment, 8 resistors are provided, which are R10 to R17, respectively. In the present embodiment, a resistor R10 is connected in parallel with a selection switch S5, a resistor R11 is connected in parallel with a selection switch S6, a resistor R12 is connected in parallel with a selection switch S7, a resistor R13 is connected in parallel with a selection switch S8, a resistor R14 is connected in parallel with a selection switch S9, a resistor R15 is connected in parallel with a selection switch S10, a resistor R16 is connected in parallel with a selection switch S11, and a resistor R17 is connected in parallel with a selection switch S12.
The operator can close different selection switches to control the nominal value of the input signal, and the set range of the nominal value of the input signal is 20mv-60 mv. For example, if the desired input signal rating is 20mv, then the selector switch S5 needs to be closed and the other selector switches S6-S12 are all open. Specifically, the corresponding relationship between the selection switches of the range selection module and the rated values of the input signals is shown in fig. 5, the rated values of the input signals are controlled by arranging a plurality of selection switches, external auxiliary measurement is not needed, the operation process is simple, and the controlled rated values are accurate.
Furthermore, the device also comprises a quick-acting loop module, wherein the input end of the quick-acting loop module is connected with the output end of the multiplying power selection module, and the output end of the quick-acting loop module is connected with the input end of the alarm module. When the input signal is greater than the set instantaneous power factor value, the output relay acts immediately, and the alarm module sends out an alarm signal.
The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.
Claims (7)
1. The utility model provides an overload relay, includes time delay reversal module, multiplying power selection module and voltage comparison module, its characterized in that: the device also comprises a full-load hysteresis module and an alarm module;
the fully-loaded hysteresis module comprises a first resistor group, a second resistor group, a third resistor group, a fourth resistor group and a capacitor group, wherein the resistor groups are sequentially connected in series and then connected in series with the capacitor group, the first resistor group is connected with an input signal, a plurality of resistors are arranged in each resistor group and connected in series, the capacitor group comprises a first capacitor and a second capacitor, the first capacitor and the second capacitor are connected in parallel, and the cathodes of the first capacitor and the second capacitor are grounded;
the first resistor group is connected with a third selection switch in parallel, the second resistor group is connected with a second selection switch in parallel, and the third resistor group is connected with a first selection switch in parallel;
the second capacitor is connected with a fourth selection switch in series, and the fourth selection switch is connected with the first capacitor in parallel;
the output end of the multiplying power selection module is connected with the input end of the full-load hysteresis module, and the output end of the full-load hysteresis module is connected with the voltage comparison module.
2. An overload relay according to claim 1 wherein: the voltage comparison module comprises a first voltage comparator and a second voltage comparator, the output end of the third resistor group and the output end of the first selection switch are both connected with the input end of the first voltage comparator, the < - > ends of the first voltage comparator and the second voltage comparator input the same reference voltage signal, the input end of the second voltage comparator is connected with the output end of the delay inversion module, and the output ends of the first voltage comparator and the second voltage comparator are both connected with the input end of the alarm module.
3. An overload relay according to claim 1 wherein: the output end of the voltage acquisition module is connected with the input end of the voltage amplification module, and the input end of the time delay reversal module and the input end of the multiplying power selection module are both connected with the output end of the voltage amplification module.
4. An overload relay according to claim 1 wherein: the first capacitor and the second capacitor have a capacitance of 100 muF.
5. An overload relay according to claim 3 wherein: the voltage amplification circuit further comprises a range selection module, the range selection module comprises a plurality of resistors connected in series, each resistor is connected with a selection switch in parallel, the input end of the range selection module is connected with the output end of the voltage amplification module, and the input end of the delay inversion module and the input end of the magnification selection module are connected with the output end of the range selection module.
6. An overload relay according to claim 1 wherein: the nominal value of the input signal is in the range of 20mv to 60 mv.
7. An overload relay according to claim 3 wherein: the input end of the quick-acting loop module is connected with the output end of the multiplying power selection module, and the output end of the quick-acting loop module is connected with the input end of the alarm module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121645875.9U CN216145556U (en) | 2021-07-20 | 2021-07-20 | Overload relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121645875.9U CN216145556U (en) | 2021-07-20 | 2021-07-20 | Overload relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216145556U true CN216145556U (en) | 2022-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121645875.9U Active CN216145556U (en) | 2021-07-20 | 2021-07-20 | Overload relay |
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|---|---|
| CN (1) | CN216145556U (en) |
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2021
- 2021-07-20 CN CN202121645875.9U patent/CN216145556U/en active Active
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