JPS5850194Y2 - air conditioner - Google Patents

Description

[Detailed description of the invention] The present invention relates to an air conditioner, more specifically, a plurality of heat source side machines such as water chilling units (hereinafter simply referred to as chillers) and at least one or more load side machines such as fan coil units (hereinafter simply referred to as chillers). It relates to an air conditioner that combines a

In general, this type of equipment includes a motor for driving each heat source side machine, a motor for driving a pump or a motor for driving a compressor for circulating cold and hot water in the air conditioner in the case of a chiller, or a motor for driving outdoor air and heat. It is equipped with a motor for driving an outdoor fan for replacement, and some or all of these motors are controlled to start and stop, thereby controlling the operation of each of the heat source machines.

When starting any heat source machine by starting and stopping the motor, a plurality of starting push button switches, that is, the same number or more as the heat source machines, are provided, and by operating these switches, one heat source machine or Either allow multiple heat source machines to operate at the same time, or use a single changeover switch.
This makes it possible to switch between multiple heat source machines.

However, according to the former, although it is possible to operate multiple machines at the same time, there are many pushbutton switches, the operation panel is complicated, and the operation is also complicated, leading to the problem of erroneous operation. Since the number of switches can be reduced,
Although the operation panel can be simplified and the driving operation can be simplified, there is a problem that the operation is selective and it is not possible to operate multiple units at the same time.

This idea was devised in view of the problems mentioned above.
This makes it possible to operate not only one heat source machine but also multiple machines simultaneously with a single push button switch.

That is, the present invention is an air conditioner that combines a plurality of heat source machines and one or more load machines, and each of the heat source machines is equipped with a motor for driving the machine. At the same time, a first parallel circuit is connected in series to one push-button start switch, consisting of one first relay that is energized by the push operation of the switch, and a start timer that is activated when the push operation time of the switch exceeds a predetermined time. a first normally open contact of the auxiliary relay, and a second parallel circuit connected in series from the first relay and the normally open contact to the auxiliary relay. are connected in parallel to each other, and are closed by the operation of the start timer,
A series circuit consisting of a second relay and a contact having a self-holding mechanism that maintains the closing operation is connected to the second relay of the auxiliary relay.
The present invention is characterized in that it is equipped with a starting control circuit for each of the motors that turns on and off in conjunction with the opening and closing operations of a normally open contact and a normally open contact of the second relay.

Embodiments of the air conditioner of the present invention will be described in detail below based on the drawings.

The one shown in Fig. 1 uses three chillers 1.2.3, and cold and hot water outlet pipes 4 are piped to the outlet side of the utilization side heat exchanger (not shown) of these chillers 1.2.3. , 5.6 through a supply header 7 to one or more cold and hot water column pipes 8.
A load-side heat exchanger (not shown) of an air conditioner 9 installed in a predetermined room or warehouse is connected to the cold/hot water column pipe 8, and cold/hot water is connected to the outlet side of the load-side heat exchanger. Connect the return pipe 10, and connect this cold/hot water return pipe 10 to the return header 11.
The inlet pipes 12, 13.14 are connected to the inlet side of each user-side heat exchanger of the chiller 1.2.3 through the cold and hot water inlet pipes 12, 13.14. Cold and hot water circulation pump P1. P2. These pumps PI via P3.

P2. By operating P3, the cold water or hot water formed by the user-side heat exchanger is circulated, and the load-side heat exchanger exchanges heat with the air in a predetermined room or warehouse, thereby performing air conditioning in these rooms or warehouses. It is.

In FIG. 1, reference numeral 15 denotes a flow meter interposed in the middle of the cold/hot water return pipe 10, which is operatively connected to the electrical system of the pump via a control device 16 that controls the operation of the pump. The control device 16 operates according to the cooling or heating load in the room or the warehouse for a certain period of time (for example, 30 minutes).
When controlling the number of pumps in operation based on the average flow rate (minutes), measuring the average flow rate of the cold/hot water return pipe 10 over a certain period of time,
The number of units is controlled based on this flow rate.

Therefore, in the air conditioner configured as described above, the operating order of the pumps is set in advance, and after the first pump P1 is driven by the startup operation, the second and third pumps P3 and 3 are activated depending on the load. P2 will be driven sequentially.

Also, these pumps P□, P2. P3 is electrically interlocked with the compressor (not shown) of the chiller 1, 2, and 3, and at startup, the pump is operated first, and then the chiller compressor is operated. Conversely, when the chiller is stopped, the chiller compressor is first stopped, and then the pump is stopped.

Further, in FIG. 1, 17 is a water replenishment tank, 18 is a bypass pipe interposed between the supply header 7 and the cold/hot water return pipe 10, and 19 is a bypass pipe installed in the cold/hot water outgoing pipe 8 according to the load. An electric valve 20 for controlling the flow rate of cold and hot water is an electric valve interposed in the bypass pipe 18 to control the bypass flow rate.

However, the above variable air conditioner is known, and in such a device, the pump P1. P2. When starting pump P3, generally one starting switch is used, and when the switch is turned on, the pump P1 in the first order is started, and if the load of pump P1 is large after starting, it is activated by the action of the control device 16. After a certain period of time (for example, 30 minutes), the second order pump P3 is started using the number control switch, and if the load is even larger, the third order pump P2 is started after a certain period of time (for example, 30 minutes) has passed. He is forcing them to do so.

Therefore, in this case, all the pumps can be started with a single start switch, but the number of pumps is controlled according to the load, and it is necessary to stabilize the start and stop, so the start interval is, for example, 30 minutes. etc., at regular intervals, and there is a problem that all the pumps cannot be started at the same time or almost at the same time even in a full-load state at the start of operation.

In the above device, in order to be able to start all of the pumps at the same time, it is sufficient to provide a starting push button switch for each pump, but this not only complicates the operation panel for controlling the operation as described above. The operation operation becomes complicated, problems of malfunction occur, and problems arise in which it becomes troublesome to control the operation of the pump according to the load, so it cannot be adopted in practice.

The present invention is such that, in the air conditioner as described above, for example, the pumps can be started with a single start switch, and all the pumps can be started at the same time if necessary. The operation control mechanism of the pump will be described in detail based on FIG.

What is shown in FIG. 2 is the pump P□, P2. in the apparatus shown in FIG. Although the operation of P3 is controlled, the same applies to the fan attached to the compressor of chiller 1.2.3 in FIG. 1 or the air-to-air heat exchanger that exchanges heat with outdoor air.

In FIG. 2, SS1 is a changeover switch for switching between remote operation and hand operation, and the remote operation side contacts of this switch are connected in series with a push button stop switch BS1 and a push button start switch BS2 for remote operation. It is wired and
The switch BS1. BS2 has the start switch BS2
A first parallel circuit is connected in series, consisting of a first relay 30B that is energized by the pushing action of the starting switch BS2, and a first starting timer 2-A1 that is activated when the pushing action time of the starting switch BS2 exceeds a predetermined time (for example, 5 seconds). is connected to.

Furthermore, an auxiliary relay 30A1 is connected in parallel to the series circuit of the first parallel circuit and the starting switch BS2, and controls on/off the starting control circuit of the pump P1, which will be described in detail later.
By connecting the series circuit of the first normally open contact 30A, -1 of the auxiliary relay 30A and a second parallel circuit formed from the normally open contact of the first relay 30B, by pressing the starting switch BS2. The auxiliary relay 30A1 is energized and self-maintained in this energized state.

Furthermore, the pressing operation time of the switch BS2 exceeds the above-mentioned time via a time-limited contact that operates for a limited time due to the operation of the timer 2-Ao, and is further increased for a predetermined time (for example, 5 seconds for a total of 10 seconds).
A second activation timer 2-A2, which is activated when the timer exceeds 2 seconds), is connected in parallel to the first parallel circuit.

Note that this second startup timer 2-A2 may be directly connected in series to the startup switch BS2, similar to the first startup timer 2-A1, but in this case, the second startup timer 2-A2 may be connected directly to the startup switch BS2 in series.
-A2, the activation switch BS2 has a pressing operation time of, for example, 1
It is necessary to set it so that it operates in 0 seconds, and therefore it cannot be used in common with the first start timer 2-AI, making parts management complicated. Preferably connected.

Further, 2-C1 and 2-C2 are timers for controlling drive time at startup, and a control device 16 that controls the number of operating pumps.
The operation of the control timers 2-C1 and 2-C2 is continued for a slightly longer time than the average flow rate detection time (for example, 30 minutes), and the control timer 2-01 is the first activation timer 2.
- The timer 2-C1 is activated for a period of, for example, 35 minutes, which is slightly longer than the average flow rate detection time from the first pump P1 started to the second pump P3 driven next. The pump P3 continues to be driven, and the pump 2-C2 starts operating by the operation of the second start timer 2-A2, and the third pump P3 starts to drive from the start of the pump P1. For example, 65, which is slightly longer than the average flow rate detection time when the command is issued.
This causes the timer 2-C2 to continue driving the pump P2 for a minute.

Also, FS is the second or lower pump P3. This is a number control switch for controlling the number of operating units P2, and although not shown, it is electrically connected to the control device 16, and its contacts are closed in response to an operation command issued from the device 16.

The contact piece of this switch FS is connected to the input side of the starting switch BS1, and is connected to an auxiliary relay 30A that opens and closes the starting control circuit of the pump P1, which will be described later, in conjunction with the first relay 30B.
, are connected via the first normally open contact 30A11 of the
And the closed side contact is connected to the pump P3, which will be described later. Second relay 30A2, 3 for opening and closing the start control circuit of P2
0A3 are connected separately.

Then, the start switch BS2 activates the first pump P.
After pump 1 is started, when the first contact of the number control switch FS is closed by the action of the control device 16, the second pump P3 is started, and when the second contact is closed, the third pump P2 is started. However, in addition, on the input side and output side of this control switch FS, and the second relay 30A2
A time limit contact of the driving time control timer 2-C1 is connected between the circuit of the second relay 30A2 and the second relay 30A on the output side of the control switch FS.
The driving time control timer 2-C2 is connected to the circuit of No. 3.
A time-limiting contact is inserted in each case.

In other words, each of these time limited contacts and the second relay 3
0 A2.30 and A3 respectively form a series circuit,
Each of these series circuits is connected in series to the second parallel circuit and in parallel to the auxiliary relay 30A1.

Thus, the control timer 2 Cr. The time limit contact 2-C2 is activated by the control timer 2-C by each operation of the activation timers 2-A, 2A2.

2-C2 is activated to close the respective relays, and furthermore, it has a self-holding function that continuously maintains the closing operation.As a result, the operation of the driving time control timer 2-C causes the second relay to close. 30A2 is energized, and the second relay 30A3 is also activated by the operation of the control timer 2-C2.
are energized, and the second and third pumps P3 . This makes it possible to drive P2.

Next, each pump P1. P2. To explain the activation control circuit of P3, each of these circuits has a normally closed push button switch BS3 and a changeover switch SS2 for switching between remote operation and hand operation, and the remote operation side contact of switch SS2 is connected to the auxiliary relay 30A, and The normally open contacts of the second relays 30A3 and 30A2 and the auxiliary relays 88X1, 88
Pump residual operation timers 2-B, 2- which operate by connecting a series circuit with X2 and 88X3 and excitation of each of the auxiliary relays 88X1, 88X2 and 88X3;
B2 and 2-B3 are provided, and each pump P1. P2. P3 motor MP11MP2
And electromagnetic switch 88PE1, 88PE compatible with MP3
2 and 88PE3 are connected in series.

A parallel circuit of the push button switch BS4 and the self-holding contacts of the auxiliary relays 88X, 88X2, and 88X3 is connected to the hand-operated contact of the changeover switch SS2.

This parallel circuit is connected to the output side of each normally open contact of the auxiliary relay 30A1 and the second relays 30A3, 30A2, and the auxiliary relay 88X.

A series circuit is formed between .

Also, a changeover switch S in the startup control circuit of each pump.
A second relay 30A3, 30A2 corresponding to another pump is connected to the remote control side contact of S2 as shown by the dotted lines in addition to the auxiliary relay 30A1 and the second relays 30A3 and 30A2.
．． . . . are connected in parallel and connected in series to the auxiliary relays 88X, . can be switched to

Moreover, each of the pumps P1. P2. The operating order of motor P3 is the motor MP1. Electromagnetic switch 88 corresponding to ......
PE1. The auxiliary relay 30A and the second relay 30A to be incorporated into each of the startup control circuits equipped with...
It can be changed arbitrarily by selecting 2 and 30A3.

That is, for example, the second relay 30A2 is connected to the motor MP.
If the start control circuit is equipped with an electromagnetic switch 88PE2 corresponding to motor MP3, and the second relay 30A is replaced with a start control circuit equipped with an electromagnetic switch 88PE3 for motor MP3,
The pump P2 will be activated second and the pump P3 will be activated third.

The device of the present invention is constructed as described above, and the pump P1. P2. If it is desired to drive P3 at the same time, this can be done simply by pressing the starting switch BS2 for a predetermined time, that is, 10 seconds.

That is, when the start switch BS2 is pressed, the rule 3 is immediately activated.
0B is energized, and the energization of the first relay 30B closes its normally open contact, energizing the auxiliary relay 30A1, and the energization of the auxiliary relay 30A causes the pump P
The second regular contact 30A, -2 of the auxiliary relay 30A1 in the starting control circuit of No. 1 is closed, and the auxiliary relay 8 of the same circuit is closed.
8X1 is excited and pump residual operation timer 2-B1
operates, the time limit contact of the timer 2-B closes, and the electromagnetic switch 88P of the motor MP1 corresponding to the pump P1 is activated.
E1 is closed, the motor MP1 is driven, and the pump P1 is activated first.

If the pressing operation of the start switch BS2 is made shorter than the set time (5 seconds) of the start timer 2-A1, only the pump P1 will start, and the other motors P2 and P3 will not start.

When the activation switch BS2 is pressed for the time set by the first activation timer 2-A1, the pump P
3 is activated second in succession.

That is, when the pressing operation continues for the set time (5 seconds), the timer 2-A1 operates, its time limit contact closes, and the driving time control timer 2-C1 is operated. This causes the time limit contact to close and energize the second relay 30A2.

As a result of this excitation, the normally open contact of the relay 30A2 in the starting control circuit of the pump P3 is closed, as in the case of starting the pump P1, and the auxiliary relay 88X3 of this starting control circuit is energized, and the pump residual operation timer 2 -B
3, the electromagnetic switch 88PE3 of the motor MP3 corresponding to the pump P3 is closed, and this closing operation drives the motor MP3 so that the pump P3 follows the pump P1 for about 5 seconds. Due to the delay, it is activated second.

Furthermore, if the pressing operation of the starting switch BS2 is continued for the set time of the starting timer 2-A1, the time limit contact of the timer 2-A closes, so that the second starting timer 2-A2, which is connected in series with the contact, closes. Preparation for operation has started, therefore, at this point, if the pressing operation is continued following the set time (5 seconds) of the second activation timer 2-A2, that is, the pressing operation of the activation switch BS2 starts. If the pushing operation continues for 10 seconds, the pump P2 will also be activated.

In this case, first the second start timer 2-A2 operates, its time limit contact closes, and the drive time control timer 2-C
At the same time, the operation of the timer 2-C2 closes the time limit contact, energizes the second relay 30A3, and activates the second relay 30A3 in the start control circuit of the pump P2, similar to the pump P1-P2. The normally open contact is closed to excite the auxiliary relay 88X2 of the circuit, and this excitation operates the pump residual operation timer 2-B2 to close the time-limited contact, which causes the motor MP2 corresponding to the pump P2 to operate. The electromagnetic switch 88PE2 is closed to drive the motor MP2, and the pump P2 is started third after pump P3 with a delay of about 5 seconds.

Note that the pump P3. P2 can be driven for a certain period of time by the driving time control timers 2-01 and 2-C2, that is, pump P3 can be continued for 35 minutes and pump P2 can be continued for 65 minutes.
CI, 2 It will stop due to the action of C2.

However, if the number control switch FS is operated during this stop period, in other words, the contact piece of the switch FS operates to the closing side contact in response to an operation command from the control device 16 that operates in response to the load. If so, from now on this control switch FS
via said pump P3. P is forced to operate continuously.

Further, each of the pumps P, P2. The operation of P3 can be stopped by operating the stop switch BS1, and is stopped after the pump remains in operation for, for example, two minutes by the operation of the pump residual operation timers 2-B1, 2-B2, and 2-B3.

In the above embodiment, three pumps PI, P2. The activation of pumps P3 can be controlled separately using one activation switch BS2, but in this invention, the activation of two pumps P, P2 can be controlled individually.
It is also possible to use two starting switches BS2 to perform each operation separately, and in this case, the electric circuit is divided into the starting circuit of the motor PM2 of the pump P2 which is started third in the electric circuit of the above embodiment, and the Start timer 2-A2 and its time-limited contact for starting motor PM2, driving time control timer 2-02 and its time-limited contact, and second relay 30
What is necessary is to omit A3.

As described above, the present invention allows a plurality of driving motors to be started individually and also to start the plurality of motors almost simultaneously using a single start switch.

Therefore, the operation panel for operating the heat source side machine is
Since it is only necessary to provide one start switch, the operation panel can be simplified.Moreover, the start control of each motor can be performed by adjusting the pressing time of one start switch, simplifying the operation. Since the starting order of the machines can be accurately performed in a timely manner, there is no possibility of incorrect starting order or malfunctions such as starting machines that should be stopped.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a piping system diagram for cold and hot water, and FIG. 2 is an electric circuit diagram.

Claims (1)

[Scope of utility model registration request] An air conditioner consisting of a combination of a plurality of heat source side machines and one or more load side machines, in which each of the heat source side machines is equipped with a motor for operating the machine, and one push button type A first parallel circuit consisting of a first relay that is energized by the push operation of the switch and a start timer that is activated when the push operation time of the switch exceeds a predetermined time is connected in series to the start switch, and an auxiliary relay is connected in series to the start switch. A second parallel circuit consisting of a first normal contact of the auxiliary relay and a normally open contact of the first relay is connected in series, and the circuit is connected in parallel to the switch and the first parallel circuit, A series circuit consisting of a second relay and a contact that closes when the activation timer operates and has a self-holding mechanism that maintains the closed operation is connected in series to the second parallel circuit and to the auxiliary relay. The air conditioning system is characterized in that it is equipped with a starting control circuit for each of the motors that is connected in parallel and turns on and off in conjunction with the opening and closing operations of the second normally open contact of the auxiliary relay and the normally open contact of the second relay. harmonization device.