CN211233273U

CN211233273U - Energy-saving control system with frequency converter control center

Info

Publication number: CN211233273U
Application number: CN201920839022.5U
Authority: CN
Inventors: 俞涛; 杨虎; 虞雪明
Original assignee: Yimikang Lengyuan Energy Saving Technology Shanghai Co ltd
Current assignee: Yimikang Lengyuan Energy Saving Technology Shanghai Co ltd
Priority date: 2019-06-04
Filing date: 2019-06-04
Publication date: 2020-08-11
Anticipated expiration: 2029-06-04

Abstract

The utility model relates to the technical field of central air-conditioning equipment, in particular to an energy-saving control system with a frequency converter control center, which aims to solve the problem that the electric valve is controlled by a set program and has no quantitative representation of the adjusting degree, so that the data acquisition way of the control mode has low automation and informatization degree, which easily causes poor energy-saving effect, and the technical key point is that the energy-saving control system comprises the electric valve arranged on a circulation pipeline close to one side of the air-conditioner terminal equipment, a power supply circuit of the electric valve is connected with a frequency converter and a current inductor, the current inductor is electrically connected with the frequency converter, the frequency converter is provided with a frequency converter control circuit and a contact switch circuit, a differential pressure sensor is utilized to transmit a monitored working current signal to the frequency converter, if the working current signal is higher than or lower than the most unfavorable terminal pressure difference, the frequency converter control circuit is controlled by the contact switch circuit to, the energy-saving effect is better.

Description

Energy-saving control system with frequency converter control center

Technical Field

The utility model relates to a central air conditioning equipment technical field, concretely relates to energy-saving control system with converter control center.

Background

The heating, ventilating and air conditioning refers to relevant equipment which is used for heating, ventilating and air conditioning indoors or in a vehicle, and a water circulation system of the heating, ventilating and air conditioning equipment mainly comprises a chilled water circulation system and a cooling water circulation system, wherein the chilled water circulation system mainly comprises a water chilling unit, a chilled water pump set, a water separator, air conditioner end equipment, a water collector and a circulation pipeline communicated with the devices as shown in figure 1.

The energy consumption of the heating ventilation air conditioner is mainly generated by the chilled water circulating system and the cooling water circulating system, wherein the energy consumed by a chilled water pump of the chilled water circulating system occupies a considerable proportion, in the energy-saving method for the chilled water circulating system in the prior art, generally, an electric valve is arranged on a water pipe at the tail end of the air conditioner, the flow of chilled water flowing through the tail end of the air conditioner is adjusted by adjusting the opening degree of the electric valve, so that the effect of stabilizing the pressure difference of the chilled water pump is achieved, but the electric valve is controlled by a set program in practical application, and the adjustment degree is not quantitatively characterized, so that the automation and the informatization degree of a data acquisition way of the control mode are not high, and the control method has defects and needs to be improved.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the motorised valve among the prior art by the program control who sets for, does not have quantitative sign to its regulation degree to this kind of control mode's data acquisition way is automatic and information degree is not high, leads to energy-conserving poor defect of effect easily, thereby provides an energy-saving control system who is equipped with converter control center.

The above technical purpose of the present invention can be achieved by the following technical solutions:

the energy-saving control system comprises an electric valve arranged on a circulating pipeline close to one side of air conditioner tail end equipment, wherein a power supply circuit of the electric valve is connected with a frequency converter and a differential pressure sensor, the differential pressure sensor is electrically connected with the frequency converter, a frequency converter control circuit and a contact switch circuit are arranged on the frequency converter, and the frequency converter control circuit controls the frequency converter to start and stop through the contact switch circuit.

Optionally, the frequency converter control circuit includes voltage input end, inching control circuit, start control circuit, stop control circuit and the normally closed point of third relay two, inching control circuit and start control circuit constitute series circuit with the normally closed point of third relay two after the parallel connection, and connect in parallel in stop control circuit.

Optionally, the jog control circuit comprises a jog switch and a first relay connected in series.

Optionally, the start control circuit comprises a start switch and a second relay which are connected in series, and two ends of the start switch are connected with a normally open point two of the second relay in parallel.

Optionally, the shutdown control circuit includes a shutdown switch and a third relay connected in series.

Optionally, the contact switch circuit includes a first normally open point of the first relay and a first normally open point of the second relay, and the first normally open point of the first relay and the first normally open point of the second relay are connected in parallel and then connected in series with a first normally closed point of the third relay.

Optionally, a switch is disposed between the frequency converter and the electric valve, the frequency converter and the switch are respectively connected to a power supply, and a voltage regulator is further disposed between the power supply and the frequency converter.

Optionally, the switch includes a normally closed key, a conversion key and a normally open key, the normally closed key is connected to the output end of the frequency converter, the conversion key is connected to the electric valve, and the normally open key is connected to the power supply.

The utility model discloses technical scheme has following advantage:

1. the utility model discloses an energy-saving control system with converter control center, with motorised valve and converter, differential pressure sensor electric connection, utilize differential pressure sensor to give the converter to the operating current signal transmission who monitors, if be higher than or be less than the most unfavorable terminal pressure difference, then through the aperture size of contact switch circuit control converter control circuit adjustment motorised valve, the messenger saves the efficiency effect better.

2. The utility model discloses an energy-saving control system with converter control center, converter control circuit's setting is converted into initial current with the operating current signal and is introduced the back from voltage input end, the adjustable output voltage of converter control circuit to the output frequency of adjustment converter, and then according to the inching control circuit and the start control circuit who concatenates, and then connect shut-down control circuit, start-up rotational speed, the operation rotational speed and the shut-down speed of the motorised valve that control and converter are connected.

3. The utility model discloses an energy-saving control system with converter control center, inching control circuit's setting will inching switch and first relay series connection, when need inching according to the actual monitoring pressure differential condition, the switch is inched in the closure, and the consequently actuation of first relay makes the converter slowly start at the uniform velocity and drives the motorised valve and move the start at the uniform velocity equally slowly, and then the follow-up contact switch circuit that links to each other of control.

4. The utility model discloses an energy-saving control system with converter control center, start control circuit's setting will start switch and second relay series connection to connect the second relay at the start switch both ends and normally open a little two, when needing to start according to the actual monitoring pressure differential condition, closed start switch, the actuation of second relay, the follow-up contact switch circuit who links to each other of control then, the converter starts, increases output frequency uniformly, and the motorised valve begins to improve the rotational speed uniformly.

5. The utility model discloses an energy-saving control system with converter control center, shutdown control circuit's setting is established ties stop switch and third relay, when needing to shut down according to the actual monitoring pressure differential condition, closed stop switch controls the follow-up contact switch circuit that links to each other then, makes the converter begin to reduce the frequency uniformly to shutting down.

6. The utility model relates to an energy-saving control system with a frequency converter control center, a change-over switch is arranged, when the frequency converter works normally, the current is communicated with an electric valve through a normally closed key and a conversion key; when a fault or maintenance occurs, the normally closed key is disconnected with the conversion key, the conversion key is connected with the normally open key, the current is communicated with the electric valve through the normally open key and the conversion key, the conversion key is communicated with the normally closed key or the normally open key, different modes are selected, and the normal work of the electric valve can be maintained when the frequency converter is maintained.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is an overall architecture diagram of a prior art chilled water circulation system;

fig. 2 is a circuit diagram of an energy saving control system according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a frequency converter control circuit according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a contact switch circuit according to an embodiment of the present invention.

Description of reference numerals:

1. an electrically operated valve; 10. a power source; 11. a differential pressure sensor; 2. a frequency converter; 3. a frequency converter control circuit; 31. a voltage input terminal; 32. a jog control circuit; 33. starting a control circuit; 34. a shutdown control circuit; 4. a contact switch circuit; 5. a switch; 51. a normally closed key; 52. a shift key; 53. a normally open key; 61. a first relay; 611. a first normally open point of the first relay; 62. a second relay; 621. a first normally open point of the second relay; 622. a second normally open point of the second relay; 63. a third relay; 631. a first normally closed point of a third relay; 632. a second normally closed point of the third relay; 71. a jog switch; 72. starting a switch; 73. a stop switch; 8. a voltage transformation voltage stabilizer.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

An energy-saving control system with a frequency converter control center is disclosed, as shown in fig. 1 and fig. 2, and comprises an electric valve 1 arranged on a circulation pipeline close to one side of an air conditioner terminal device, wherein a frequency converter 2 and a differential pressure sensor 11 are arranged on a power supply circuit of the electric valve 1, the differential pressure sensor 11 is electrically connected with the frequency converter 2, and a frequency converter control circuit 3 and a contact switch circuit 4 are arranged in the frequency converter 2, so that the frequency converter control circuit 3 can control the start and stop of the frequency converter 2 through the contact switch circuit 4. Therefore, the working speed of the chilled water pump set is firstly adjusted, the pressure difference of the end parts of the water supply and return pipelines at two sides of the chilled water pump set is adjusted to the most unfavorable tail end pressure difference (generally, the pressure difference of tail end equipment with the largest pressure difference between a water separator and a water collector is taken), the flow supply of the tail end equipment of the air conditioner can be ensured by setting the most unfavorable tail end pressure difference because the pressure difference is in direct proportion to the square of the flow, the required flow of other parallel tail end equipment of the air conditioner can also be ensured, and meanwhile, the pressure difference at two sides of the chilled water pump is in direct proportion to the lift of the chilled water pump, so that the actual lift of the chilled water pump set can be larger than the required lift of the chilled water circulation system by setting the pressure difference to the most unfavorable tail end pressure difference, the user. Namely, the differential pressure sensor 11 is used for transmitting a monitored working current signal to the frequency converter 2, and if the working current signal is higher or lower than the pressure difference of the worst tail end, the contact switch circuit 4 controls the frequency converter control circuit 3 to adjust the opening of the electric valve 1, so that the energy-saving effect is better.

As shown in fig. 2 and fig. 3, the frequency converter control circuit 3 includes a voltage input terminal 31, a jog control circuit 32, a start control circuit 33, a stop control circuit 34, and a second normally closed point 632 of a third relay, the jog control circuit 32 and the start control circuit 33 are connected in parallel and then form a series circuit with the second normally closed point 632 of the third relay, and are connected in parallel to the stop control circuit 34, so that the electric valve 1 can jog at a constant speed, start, and stop, and the frequency converter control circuit 3 is further configured to adjust an output voltage, thereby adjusting an output frequency of the frequency converter 2, and further controlling a start speed, an operating speed, and a stop speed of the electric valve 1 connected to the frequency converter 2.

As shown in fig. 2 and fig. 3, the jog control circuit 32 includes a jog switch 71 and a first relay 61 connected in series, the start control circuit 33 includes a start switch 72 and a second relay 62 connected in series, a normally open point two 622 of the second relay is connected in parallel to both ends of the start switch 72, the stop control circuit 34 is formed by connecting a stop switch 73 and a third relay 63 in series, and relays are added in the control circuits to enhance the output power of the control circuits, so as to control the frequency converter 2 through the switches.

As shown in fig. 2 and 4, the contact switch circuit 4 includes a first normally open point 611 of the first relay and a first normally open point 621 of the second relay, and the first normally open point 611 of the first relay and the first normally open point 621 of the second relay are connected in parallel and then connected in series with a first normally closed point 631 of the third relay. Because the normally open point of the relay is disconnected when not electrified, after the relay is electrified, the two contacts are closed; the normally closed point is closed when not electrified, and after the normally closed point is electrified, the two contacts are disconnected, so that the frequency converter control circuit 3 can control the starting and stopping of the frequency converter 2 through the contact switch circuit 4.

As shown in fig. 2, a change-over switch 5 is further disposed between the frequency converter 2 and the electric valve 1, so that when the frequency converter 2 fails or is overhauled, the normal operation of the electric valve 1 can be ensured, and a proper opening degree is always maintained.

As shown in fig. 2, in this embodiment, the power source 10 is selected as a three-phase input power source, the frequency converter 2 and the change-over switch 5 are respectively connected to the three-phase input power source, and a voltage transformation stabilizer 8 is arranged between the three-phase input power source and the frequency converter 2, so as to ensure the stability and the safety of the connection between the frequency converter 2 and the electric valve 1, when the electric network is filtered, an instantaneous too high impact current is caused to pass through the voltage transformation stabilizer 8, and a fuse inside the voltage transformation stabilizer 8 can be fused, so as to protect the frequency converter 2 and the electric valve 1 from being damaged.

As shown in fig. 2, the change-over switch 5 includes a normally closed key 51, a transfer key 52, and a normally open key 53, the normally closed key 51 is connected to the output end of the inverter 2, the transfer key 52 is connected to the electric valve 1, and the normally open key 53 is connected to the three-phase input power source. When the frequency converter 2 works normally, the current is communicated with the electric valve 1 through the normally closed key 51 and the conversion key 52; when the frequency converter 2 goes wrong or is overhauled, the normally closed key 51 is disconnected from the conversion key 52, the conversion key 52 is connected with the normally open key 53, and the current is communicated with the electric valve 1 through the normally open key 53 and the conversion key 52, so that the electric valve 1 can normally run at any time without being influenced by the frequency converter 2.

The working principle of the energy-saving control system is as follows: the pressure difference sensor 11 monitors the pressure difference of the end parts of the water supply and return pipelines at two sides of the chilled water pump set, the generated induced current signal is transmitted to the frequency converter control circuit 3, and according to a set current value (the worst tail end pressure difference), when the inching is needed, the inching switch 71 is closed, then the normally open point I611 of the first relay is sucked, so that the contact switch circuit 4 is closed, and the frequency converter 2 is slowly started at a constant speed, namely the electric valve 1 is slowly started at a constant speed;

when the starting is needed, the starting switch 72 is closed, and the first normally open point 621 of the second relay is attracted, so that the contact switch circuit 4 is closed, the frequency converter 2 is started, the output frequency is gradually and uniformly increased, and the electric valve 1 starts to uniformly increase the rotating speed;

when the stop switch 73 is closed when the stop is needed, the normally closed point I631 of the third relay is opened, the second relay 62 is disconnected after power failure, the normally open point I621 of the second relay is opened, and the contact switch circuit 4 is opened, so that the frequency converter 2 starts to uniformly reduce the frequency to stop according to the set deceleration time.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. The energy-saving control system with the frequency converter control center is characterized by comprising an electric valve (1) arranged on a circulating pipeline close to one side of air conditioner terminal equipment, wherein a power supply circuit of the electric valve (1) is connected with a frequency converter (2) and a differential pressure sensor (11), the differential pressure sensor (11) is electrically connected with the frequency converter (2), a frequency converter control circuit (3) and a contact switch circuit (4) are arranged on the frequency converter (2), and the frequency converter control circuit (3) controls the starting and stopping of the frequency converter (2) through the contact switch circuit (4).

2. The energy-saving control system provided with the frequency converter control center is characterized in that the frequency converter control circuit (3) comprises a voltage input end (31), a inching control circuit (32), a starting control circuit (33), a stopping control circuit (34) and a second normally closed point (632) of a third relay, wherein the inching control circuit (32) and the starting control circuit (33) are connected in parallel, then form a series circuit with the second normally closed point (632) of the third relay, and are connected in parallel with the stopping control circuit (34).

3. An energy-saving control system provided with a frequency converter control center according to claim 2, characterized in that the inching control circuit (32) comprises a inching switch (71) and a first relay (61) which are connected in series.

4. The energy-saving control system provided with the frequency converter control center is characterized in that the starting control circuit (33) comprises a starting switch (72) and a second relay (62) which are connected in series, and a normally open point II (622) of the second relay is connected in parallel to two ends of the starting switch (72).

5. An energy-saving control system with frequency converter control center according to claim 4, characterized in that the stop control circuit (34) comprises a stop switch (73) and a third relay (63) connected in series.

6. The energy-saving control system provided with the frequency converter control center is characterized in that the contact switch circuit (4) comprises a first normally open point (611) of a first relay and a first normally open point (621) of a second relay, and the first normally open point (611) of the first relay and the first normally open point (621) of the second relay are connected in parallel and then connected in series with a first normally closed point (631) of a third relay.

7. An energy-saving control system with a frequency converter control center according to claim 1, characterized in that a change-over switch (5) is arranged between the frequency converter (2) and the electric valve (1), the frequency converter (2) and the change-over switch (5) are respectively connected with a power supply (10), and a voltage transformation stabilizer (8) is further arranged between the power supply (10) and the frequency converter (2).

8. The energy-saving control system provided with a frequency converter control center is characterized in that the change-over switch (5) comprises a normally closed key (51), a change-over key (52) and a normally open key (53), wherein the normally closed key (51) is connected with the output end of the frequency converter (2), the change-over key (52) is connected with the electric valve (1), and the normally open key (53) is connected with the power supply (10).