CN216851796U - Pressure reduction starting circuit and compressor water chilling unit - Google Patents

Abstract

The application provides a step-down starting circuit and a compressor water chilling unit. The voltage reduction starting circuit comprises a power supply connecting end which is used for being electrically connected with a power supply; the compressor connecting ends are used for being correspondingly and electrically connected with the compressors; the voltage reduction circuit is electrically connected with the power supply connecting end and is used for reducing the voltage output by the power supply; the switching circuits are respectively and correspondingly electrically connected with the connecting ends of the compressors and are electrically connected with the voltage reduction circuit and the power supply connecting end, and the switching circuits comprise starting states and working states; in a starting state, the power supply connecting end is communicated with the corresponding compressor connecting end through the voltage reduction circuit and the switching circuit so as to start the corresponding compressor; in the working state, the power supply connecting end is communicated with the compressor connecting end through the switching circuit, and the voltage reduction circuit is disconnected with the compressor connecting end so as to enable the compressor to work. The plurality of compressors share the same voltage reduction circuit, so that the use of voltage reduction components is reduced, the cost is reduced, and the occupation of the voltage reduction components to the space is reduced.

Description

Pressure reduction starting circuit and compressor water chilling unit

Technical Field

The application relates to the field of air conditioners, in particular to a voltage reduction starting circuit and a compressor water chilling unit.

Background

With the development of science and technology, more and more industries use high-power electric appliances. The starting instantaneous current of the electric appliance is very large, the current after starting is relatively reduced, but the safety and related control electric appliances are usually adapted to safely pass large current, so that the phenomenon of resource waste is caused.

In the air conditioning field, the compressor is one of indispensable parts, and the user often adopts the mode of decompression start-up to start-up the compressor to reduce and start instantaneous current, but along with the increase of compressor quantity, each compressor all must be equipped with corresponding decompression start-up part, and is with high costs, and the bulky of a plurality of decompression start-up parts, occupation space is big.

SUMMERY OF THE UTILITY MODEL

The application provides a step-down starting circuit and compressor cooling water set can reduce cost, reduces the occupation of step-down starting unit to the space.

One aspect of the present application provides a buck start-up circuit, comprising: the power supply connecting end is used for being electrically connected with a power supply; the compressor connecting ends are used for being correspondingly and electrically connected with the compressors; the voltage reduction circuit is electrically connected with the power supply connecting end and is used for reducing the voltage output by the power supply; the switching circuits are respectively and correspondingly electrically connected with the connecting ends of the compressors and are electrically connected with the voltage reduction circuit and the power supply connecting end, and the switching circuits comprise starting states and working states; in the starting state, the power supply connecting end is communicated with the corresponding compressor connecting end through the voltage reduction circuit and the switching circuit so as to start the corresponding compressor; in the working state, the power supply connecting end is communicated with the compressor connecting end through the switching circuit, and the voltage reduction circuit is disconnected with the compressor connecting end so as to enable the compressor to work.

Further, the switching circuit includes: the first switch is connected with the voltage reduction circuit and the corresponding compressor connecting end; the second switch is connected with the power supply connecting end and the corresponding compressor connecting end; in the starting state, the first switch is closed, the second switch is opened, and the power supply connecting end is communicated with the compressor connecting end through the voltage reduction circuit and the first switch; in the working state, the first switch is switched off, the second switch is switched on, and the power supply connecting end is communicated with the compressor connecting end through the second switch.

Further, the first switches of the plurality of switching circuits are interlocked.

Further, the step-down circuit includes a reactor, one end of which is electrically connected to the power supply connection end, and the other end of which is electrically connected to the compressor connection end through the switching circuit.

Furthermore, the voltage reduction circuit comprises an auto transformer and a third switch, the high-voltage side of the auto transformer is electrically connected with the power connection end, the low-voltage side of the auto transformer is electrically connected with the compressor connection end through the switching circuit, and the grounding side of the auto transformer is grounded through the third switch.

Further, the switching circuit is electrically connected with the compressor connecting end through the first current transformer.

Further, the step-down starting circuit further comprises a charge indicator, wherein the charge indicator is electrically connected between the current transformer and the compressor connecting end; and/or, the step-down starting circuit further comprises an arrester, and the arrester is connected between the current transformer and the compressor connecting end.

Further, the device also comprises a protection circuit; the protection circuit comprises a vacuum circuit breaker and a second current transformer which are connected in series, the vacuum circuit breaker is electrically connected with the power supply connecting end, and the second current transformer is electrically connected with the voltage reduction circuit and the switching circuit respectively; or, the protection circuit includes fourth switch and the fuse of establishing ties, the fourth switch with the power connection end electricity is connected, the fuse respectively with step-down circuit with the switching circuit electricity is connected.

Further, still include the discharge switch, the power connection end passes through discharge switch ground connection.

Another aspect of the present application provides a compressor chiller comprising: a plurality of compressors; and the voltage reduction starting circuit is used for correspondingly and electrically connecting the connecting ends of the compressors with the compressors.

The voltage reduction starting circuit comprises a voltage reduction circuit and a plurality of switching circuits, wherein the switching circuits are respectively and correspondingly electrically connected with the connecting ends of the compressors, and the switching circuits are connected with the voltage reduction circuit and the power supply connecting end; when the switching circuit is in a starting state, the current passes through the voltage reduction circuit, the switching circuit and the compressor connecting end to start the corresponding compressor; when the switching circuit is in working state, the current passes through the switching circuit to make the compressor work normally. The plurality of compressors share the same voltage reduction circuit, so that the use of voltage reduction components is reduced, the cost is reduced, and the occupation of the voltage reduction components to the space is reduced.

Drawings

FIG. 1 is a schematic view of an embodiment of a compressor chiller according to the present application;

FIG. 2 is a schematic diagram of one embodiment of a buck start-up circuit according to the present application;

FIG. 3 is a schematic diagram of another embodiment of a buck start-up circuit according to the present application;

FIG. 4 is a schematic diagram of another embodiment of a buck start-up circuit according to the present application;

fig. 5 is a schematic diagram of a buck start-up circuit according to yet another embodiment of the present application.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus consistent with certain aspects of the present application, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "a number" means two or more. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

The step-down starting circuit of the embodiment of the application comprises a power supply connecting end, a plurality of compressor connecting ends, a step-down circuit and a plurality of switching circuits. The power supply connecting end is used for being electrically connected with a power supply; the compressor connecting ends are used for being correspondingly and electrically connected with the compressors; the voltage reduction circuit is electrically connected with the power supply connecting end and is used for reducing the voltage output by the power supply; the switching circuits are respectively and correspondingly electrically connected with the connecting ends of the compressors and are electrically connected with the voltage reduction circuit and the power supply connecting end, and the switching circuits comprise starting states and working states; in a starting state, the power supply connecting end is communicated with the corresponding compressor connecting end through the voltage reduction circuit and the switching circuit so as to start the corresponding compressor; in the working state, the power supply connecting end is communicated with the compressor connecting end through the switching circuit, and the voltage reduction circuit is disconnected with the compressor connecting end so as to enable the compressor to work.

The voltage reduction starting circuit comprises a voltage reduction circuit and a plurality of switching circuits, the plurality of switching circuits are respectively and correspondingly electrically connected with the plurality of compressor connecting ends, and the plurality of switching circuits are connected with the voltage reduction circuit and the power supply connecting end; when the switching circuit is in a starting state, the current passes through the voltage reduction circuit, the switching circuit and the compressor connecting end to start the corresponding compressor; when the switching circuit is in working state, the current passes through the switching circuit to make the compressor work normally. The plurality of compressors share the same voltage reduction circuit, so that the use of voltage reduction components is reduced, the cost is reduced, and the occupation of the voltage reduction components to the space is reduced.

FIG. 1 is a schematic diagram of one embodiment of a compressor chiller 10. The compressor chiller 10 includes a plurality of compressors 101 and a step-down start circuit 100. The step-down starting circuit 100 is electrically connected to the compressors 101, and is configured to start the plurality of compressors 101 in a step-down manner. The step-down start-up circuit 100 is connected to a power supply 11, and the power supply 11 is used for supplying power.

Fig. 2 is a circuit diagram of one embodiment of buck start-up circuit 100. The step-down starting circuit 100 includes a power supply connection terminal 110, a plurality of compressor connection terminals 120, a step-down circuit 130, and a plurality of switching circuits 140. And a power connection terminal 110 for electrically connecting with the power source 11. A plurality of compressor connection ends 120 for corresponding electrical connection with the plurality of compressors 101. And a voltage reduction circuit 130 electrically connected to the power connection terminal 110 for reducing the voltage output by the power supply 11. The plurality of switching circuits 140 are electrically connected to the plurality of compressor connection terminals 120, respectively, and are electrically connected to the voltage step-down circuit 130 and the power supply connection terminal 110. The switching circuit 140 includes an active state and an active state. In the start-up state, the power supply connection terminal 110 is connected to the corresponding compressor connection terminal 120 through the voltage-reducing circuit 130 and the switching circuit 140 to start up the corresponding compressor 101. In the operating state, the power connection terminal 110 is connected to the compressor connection terminal 120 through the switching circuit 140, and the voltage reducing circuit 130 is disconnected from the compressor connection terminal 120, so that the compressor 101 operates.

The step-down starting circuit 100 includes a step-down circuit 130 and a plurality of switching circuits 140, the plurality of switching circuits 140 are electrically connected to the plurality of compressor connection terminals 120, respectively, and the plurality of switching circuits 140 are connected to the step-down circuit 130 and the power supply connection terminal 110. When the switching circuit 140 is in the starting state, the current passes through the voltage reduction circuit 130, the switching circuit 140 and the compressor connecting end 120 to start the corresponding compressor 101; when the switching circuit 140 is in an operating state, the current flows through the switching circuit 140, so that the compressor 101 operates normally. In this way, the plurality of compressors 101 share the same voltage reduction circuit 130, so that the use of voltage reduction components is reduced, the cost is reduced, and the occupation of the voltage reduction components on the space is reduced.

The power source 11 may comprise an ac power source, which may provide ac power, such as industrial power, utility power. The power supply 11 is electrically connected to the power connection terminal 110 to supply power to the buck start-up circuit 100.

The voltage step-down circuit 130 is electrically connected to the power connection terminal 110, and is configured to step down the voltage output by the power supply 11. The voltage-reducing circuit 130 includes a reactor 131, one end of the reactor 131 is electrically connected to the power connection terminal 110, and the other end of the reactor 131 is electrically connected to the switching circuit 140. The reactor 131 is connected in series between the power connection terminal 110 and the switching circuit 140, the reactor 131 generates an alternating magnetic field through alternating current, the current induces impedance through the alternating magnetic field, and the current generates voltage drop through the impedance, so that the purpose of reducing the voltage output by the power supply 11 is achieved.

The plurality of switching circuits 140 are electrically connected to the plurality of compressor connection terminals 120, respectively, and are electrically connected to the voltage step-down circuit 130 and the power supply connection terminal 110. When one of the compressors 101 is started, the switching circuit 140 corresponding to the compressor needs to be operated to perform the step-down start and the normal operation. Therefore, for a plurality of compressors 101, different switching circuits 140 and the same voltage reduction circuit 130 are adopted to perform voltage reduction starting and maintain normal operation, so that the plurality of compressors 101 can perform voltage reduction starting by adopting the same voltage reduction circuit 130, the effect of saving cost is achieved, and the occupation of a voltage reduction part to the space is reduced.

The switching circuit 140 includes a first switch 141 and a second switch 142, the first switch 141 connects the voltage step-down circuit 130 and the corresponding compressor connection terminal 120, and the second switch 142 connects the power connection terminal 110 and the corresponding compressor connection terminal 120. Each compressor 101 corresponds to one compressor connection end 120 and also corresponds to one switching circuit 140, each switching circuit 140 corresponds to one first switch 141 and one second switch 142, wherein the first switch 141 is used for controlling the on-off of the voltage reduction circuit 130 and the compressor connection end 120, and the second switch 142 is used for controlling the on-off of the power supply connection end 110 and the compressor connection end.

When one of the compressors 101 needs to be started, the switching circuit 140 connected with the compressor starts to operate, the first switch 141 is closed, the voltage reduction circuit 130 is connected with the compressor connecting end 120, the compressor 101 has a starting voltage, and the compressor 101 receives the voltage reduced by the voltage reduction circuit 130, so that the purpose of starting in a voltage reduction mode is achieved. When the compressor 101 is started, the switching circuit 140 connected to the compressor starts to operate, the second switch 142 is closed, the first switch 141 is opened, the compressor connection end 120 is disconnected from the voltage reduction circuit 130, the compressor connection end 120 is connected to the power connection end 110, the purpose of directly connecting to the power supply 11 is achieved, and the compressor 101 is supplied with a working voltage for normal operation.

The first switches 141 of the plurality of switching circuits 140 are interlocked, specifically, the voltage reduction circuit 130 is used for voltage reduction starting of one of the compressors 101 at the same time, different switching circuits can only close one first switch 141 at the same time, normal working of the voltage reduction circuit 130 is guaranteed, normal voltage reduction starting of the compressors 101 is guaranteed, and loads of the plurality of compressors 101 exceeding the voltage reduction circuit 130 are prevented from being started at the same time, so that the compressors 101 cannot be started normally.

The buck start circuit 100 also includes a first current transformer 150, a charge indicator 160, and a lightning arrester 170. The step-down circuit 130 and the switching circuit 140 are connected to the compressor connection terminal 120 through a first current transformer 150, a charge indicator 160, and a surge arrester 170. The current transformer 150 plays a role of limiting overcurrent to prevent instantaneous large current from damaging the compressor 101, and the first current transformer 150 may be a plurality of sets of current transformers. The charge indicator 160 is used to display whether the current passes through the buck starting circuit 100, so that the user can intuitively determine whether the compressor 101 starts to start and operate through the charge indicator 160. In some embodiments, the charge indicator 160 may be a high voltage charge indicator. The lightning arrester 170 is used for protecting the compressor 101 from high transient overvoltage, and can limit the follow current time and the follow current amplitude of the overvoltage, so as to achieve the effect of protecting equipment.

Buck start-up circuit 100 also includes a protection circuit 180. When a fault occurs, the protection circuit 180 protects the step-down circuit 130 and the switching circuit 140 by way of an open circuit, thereby protecting the compressor 101. In the present embodiment, the protection circuit 180 includes a fourth switch 183 and a fuse 184 connected in series, the fourth switch 183 is electrically connected to the power connection terminal 110, and the fuse 184 is electrically connected to the step-down circuit 130 and the switching circuit 140, respectively. The power connection terminal 110, the fourth switch 183, and the fuse 184 are connected in sequence. The fourth switch 183 controls whether the step-down starting circuit 100 is powered on or not, and the fuse 184 is connected in series in the circuit as a fuse body, and is fused due to self heating when an overload or short-circuit current passes through the fuse body, so that the circuit is broken. The fuse 184 is used as a protection device, and has a simple structure and is convenient to use.

In some embodiments, the buck start circuit 100 further includes a discharge switch 190, and the power connection 110 is grounded through the discharge switch 190. When the compressor 101 stops using, still remain the electric energy in order to avoid step-down starting circuit 100 and the compressor 101, through discharge switch 190 ground connection, release the electric energy of reserving, prevent to take place the risk of electrocuteeing, and when the compressor cooling water set 10 was in the shutdown state, the static that will produce was led into earth, protection equipment.

Fig. 3 is a circuit diagram of another embodiment of the buck start-up circuit 100. The embodiment shown in fig. 3 is similar to the embodiment shown in fig. 2, and compared to the embodiment shown in fig. 2, the embodiment shown in fig. 3 includes a vacuum circuit breaker 181 and a second current transformer 182 connected in series, the vacuum circuit breaker 181 being electrically connected to the power connection terminal 110, and the second current transformer 182 being connected to the step-down circuit 130 and the switching circuit 140, respectively. The power connection end 110, the vacuum circuit breaker 181 and the second current transformer 182 are connected in sequence. The vacuum circuit breaker 181 has the advantages of small volume, light weight, suitability for frequent operation, and no need for maintenance for arc extinguishing, and has the function of protecting electrical equipment.

Fig. 4 is a circuit diagram of another embodiment of the buck start-up circuit 100. The embodiment of fig. 4 is similar to the embodiment of fig. 2, and in contrast to the embodiment of fig. 2, the step-down circuit 130 of the embodiment of fig. 4 includes an autotransformer 132 and a third switch 133, the high side 1321 power connection of the autotransformer is electrically connected, the low side 1322 of the autotransformer is electrically connected to the switching circuit 140, and the ground side 1323 of the autotransformer is grounded through the third switch 133. The third switch 133 can be opened and closed manually or by computer instructions. When the third switch 133 is closed, the ground side 1323 of the autotransformer is grounded; in operation of the autotransformer 132, the high voltage side 1321 of the autotransformer 132 receives the high voltage from the power supply 11, and the high voltage is stepped down by the autotransformer 132 and flows out of the low voltage side 1322 of the autotransformer 132 for use in a subsequent step down start. In some embodiments, the low voltage side 1322 includes a plurality of taps, where the taps are taps connected from the coil of the autotransformer 132, and the number of turns of the coil corresponding to each tap is different, so as to meet different voltage reduction requirements.

Fig. 5 is a schematic diagram of still another embodiment of the buck start-up circuit 100. The embodiment shown in fig. 5 is similar to the embodiment shown in fig. 2, and compared to the embodiment shown in fig. 2, the embodiment shown in fig. 5 includes a vacuum circuit breaker 181 and a second current transformer 182 connected in series, the vacuum circuit breaker 181 being electrically connected to the power connection terminal 110, and the second current transformer 182 being connected to the step-down circuit 130 and the switching circuit 140, respectively. The power connection end 110, the vacuum circuit breaker 181 and the second current transformer 182 are connected in sequence. The vacuum circuit breaker 181 has the advantages of small volume, light weight, suitability for frequent operation, and no need for maintenance for arc extinguishing, and has the function of protecting electrical equipment.

The step-down circuit 130 includes an autotransformer 132 and a third switch 133, a power connection terminal of a high voltage side 1321 of the autotransformer is electrically connected, a low voltage side 1322 of the autotransformer is electrically connected to the switching circuit 140, and a ground side 1323 of the autotransformer is grounded through the third switch 133. The third switch 133 can be opened and closed manually or by computer instructions. When the third switch 133 is closed, the ground side 1323 of the autotransformer is grounded; when the autotransformer 132 is in operation, the high voltage side 1321 of the autotransformer 132 receives the high voltage from the power source 11, and the high voltage flows out from the low voltage side 1322 of the autotransformer 132 after being stepped down by the autotransformer 132, so as to be used for subsequent step-down start. In some embodiments, the low voltage side 1322 includes a plurality of taps, where the taps are taps connected from the coil of the autotransformer 132, and the number of turns of the coil corresponding to each tap is different, so as to meet different voltage reduction requirements.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims (10)

1. A buck start-up circuit, comprising:

the power supply connecting end is used for being electrically connected with a power supply;

the compressor connecting ends are used for being correspondingly and electrically connected with the compressors;

the voltage reduction circuit is electrically connected with the power supply connecting end and is used for reducing the voltage output by the power supply;

the switching circuits are respectively and correspondingly electrically connected with the connecting ends of the compressors and are electrically connected with the voltage reduction circuit and the power supply connecting end, and the switching circuits comprise starting states and working states; in the starting state, the power supply connecting end is communicated with the corresponding compressor connecting end through the voltage reduction circuit and the switching circuit so as to start the corresponding compressor; in the working state, the power supply connecting end is communicated with the compressor connecting end through the switching circuit, and the voltage reduction circuit is disconnected with the compressor connecting end so as to enable the compressor to work.

2. The buck start-up circuit according to claim 1, wherein the switching circuit comprises:

the first switch is connected with the voltage reduction circuit and the corresponding compressor connecting end;

the second switch is connected with the power supply connecting end and the corresponding compressor connecting end;

in the starting state, the first switch is closed, the second switch is opened, and the power supply connecting end is communicated with the compressor connecting end through the voltage reduction circuit and the first switch;

in the working state, the first switch is switched off, the second switch is switched on, and the power supply connecting end is communicated with the compressor connecting end through the second switch.

3. The buck start circuit according to claim 2, wherein the first switches of the plurality of switching circuits are interlocked.

4. The step-down start-up circuit according to claim 1, wherein the step-down circuit includes a reactor, one end of which is electrically connected to the power supply connection terminal, and the other end of which is electrically connected to the compressor connection terminal through the switching circuit.

5. The step-down starting circuit according to claim 1, wherein the step-down circuit includes an autotransformer whose high-voltage side is electrically connected to the power connection terminal and whose low-voltage side is electrically connected to the compressor connection terminal through the switching circuit, and a third switch through which a ground side of the autotransformer is grounded.

6. The buck start-up circuit according to claim 1, further comprising a first current transformer, the buck circuit and the switching circuit each being electrically connected to the compressor connection terminal through the first current transformer.

7. The step-down start-up circuit of claim 6, further comprising a charge indicator electrically connected between the current transformer and the compressor connection terminal; and/or

The voltage reduction starting circuit further comprises an arrester, and the arrester is connected between the current transformer and the compressor connecting end.

8. The buck start-up circuit according to claim 1, further comprising a protection circuit;

the protection circuit comprises a vacuum circuit breaker and a second current transformer which are connected in series, the vacuum circuit breaker is electrically connected with the power supply connecting end, and the second current transformer is electrically connected with the voltage reduction circuit and the switching circuit respectively; or

The protection circuit includes fourth switch and the fuse of establishing ties, the fourth switch with the power connection end electricity is connected, the fuse respectively with step-down circuit with the switching circuit electricity is connected.

9. The buck start-up circuit according to claim 1, further comprising a discharge switch through which the power connection terminal is connected to ground.

10. A compressor chiller, comprising:

a plurality of compressors;

the step-down start-up circuit of any of claims 1-9, a plurality of said compressor connection terminals being electrically connected to a corresponding plurality of said compressors.

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