JP3530824B2 - Air conditioning system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold water or hot water feed pump used for air conditioning, based on the signal information of the opening degree of a two-way valve for secondary side control, the required minimum feed amount and pump head. The present invention relates to an air conditioning system in which the shaft power of the pump is minimized by controlling so that

[0002]

2. Description of the Related Art FIG. 5 is an explanatory view of a configuration of a conventional example which has been generally used. The primary water supply pump 1 sends cold water or hot water from the return header 2 to the first sending header 4 via the refrigerator, the cold / hot water generator, or the boiler 3.

The secondary water supply pump 5 comprises an inverter 6 and sends cold water or hot water from the first feed header 4 to the second feed header 7. The flow rate sensor 8 measures the flow rate of cold water or hot water sent from the second feed header 7 to the return header 2 via the control two-way valve 9 and the heat exchanger 11.

The differential pressure sensor 12 measures the differential pressure of cold water or hot water between the second feed header 7 and the return header 2. The number-of-units controller 13 commands the secondary water pump 5 to operate based on the measured values of the flow rate sensor 8 and the differential pressure sensor 12 so that the optimum number of units can be operated.

In the above structure, the cold water or hot water produced by the primary water pump 1 is fed by the secondary water pump 5 to the heat exchanger 11 at the secondary use point. By controlling the control two-way valve 9 according to the required heat exchange amount of the heat exchanger 11, the secondary side circulating water amount has a variable flow rate.

At this time, the flow rate sensor 8 detects the flow rate, and an operation command is issued from the number-of-units control controller 13 to the secondary water supply pump 5 so that the minimum number of operating machines is reached. The differential pressure between the feed header 7 and the return header 2 of No. 2 is detected, and a rotation speed control signal is transmitted to the inverter 6 so as to reach a preset required differential pressure.

As a result, it is possible to obtain an air-conditioning system which can reduce the amount of power consumption.

[0008]

However, such a conventional air conditioning system has the following problems. (1) The 2nd without directly detecting the required amount of water on the secondary side.
A constant pressure rotation speed control system by detecting the differential pressure between the feed header 7 and the return header 2 or the pressure of the second feed header 7.

(2) Since it is a constant pressure rotation speed control system, there is an energy saving effect due to the reduction of the amount of water, but the flow rate ratio is 2
The energy saving effect of the pump head that is reduced in proportion to the power is that the rotation speed control system is small.

(3) There is no other way to make adjustments than on-site adjustments.
Also, since there is no function of accumulating past data, it is necessary to perform separate monitoring for optimum value adjustment, making adjustment difficult.

An object of the present invention is to solve the above problems, and an object thereof is to provide an air conditioning system having a power saving effect.

[0012]

In order to achieve such an object, according to the present invention, in the air conditioning system according to claim 1, cold water or hot water from a return header is supplied to a refrigerator, a cold / hot water generator or a boiler. Via a primary water feed pump for sending to the first feed header via an inverter, a secondary water feed pump having an inverter for sending cold water or hot water from the first feed header to the second feed header, the second feed header and the return An air conditioning system comprising a control two-way valve provided between the header and a header, and a differential pressure sensor for measuring a differential pressure of cold water or hot water between the second feed header and the return header. A secondary pump controller having an input / output calculation unit for controlling the inverter based on a valve opening signal and a measurement signal of the differential pressure sensor is provided.

According to a second aspect of the present invention, in the air conditioning system according to the first aspect, the input / output calculation section includes a monitor input signal section for inputting a monitor input signal, a monitor display section, and a data storage section. Is characterized by.

According to a third aspect of the present invention, in the air conditioning system according to the first or second aspect, the secondary pump controller is provided with an operation display section for displaying an operation status.

According to a fourth aspect of the present invention, in the air conditioning system according to any one of the first to third aspects, the operation status is remotely displayed via a remote communication means provided in the secondary pump controller. It is characterized in that the external communication unit 1 is provided.

[0016] According to a fifth aspect of the present invention, in the air conditioning system according to any one of the first to fourth aspects, the secondary pump controller is required for operation from a remote location via remote communication means provided in the secondary pump controller. It is characterized by comprising a second external communication unit for setting and changing parameters.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of a main part configuration of an embodiment of an air conditioning system of the present invention, FIG. 2, FIG. 3, FIG. 4 and FIG.
FIG. 3 is an operation explanatory diagram of FIG. 1.

In the figure, the same symbols as those in FIG. 5 represent the same functions. Only parts different from FIG. 5 will be described below. The number-of-units control controller 21 commands the secondary water pump 5 to operate based on the measurement value of the flow rate sensor 8 so that the optimum number of units can be operated.

The secondary pump controller 22 has an input / output calculation unit 221 which controls the rotation speed of the inverter 6 based on the opening signal of the control two-way valve 9 and the measured value of the differential pressure sensor 12. The monitor input signal unit 23 inputs the monitor input signal to the input / output calculation unit 221.

The operation display section 222 is provided in the secondary pump controller 22 and displays the operation status. The first external communication unit 223 is provided in the secondary pump controller 22 and remotely displays the operation status via the remote communication unit 24.

The second external communication section 224 is provided in the secondary pump controller 22 and changes the parameters required for operation from a remote location via the remote communication means 24. In this case, the remote communication means 24 uses the Internet. 25 is an external operation terminal. Reference numeral 26 is a signal converter of the control two-way valve 9.

Next, the operation of the apparatus of the present invention thus constructed will be described. 2 shows a flow chart, FIG. 3 shows a relationship between the water supply request signal S1, the standby request signal S2, the valve opening degree V1 of the control two-way valve 9, the pressure set value P of the differential pressure sensor 12, and the flow chart of FIG. Show.

In FIGS. 2 and 3, a water supply amount increasing loop, a water supply amount invariant loop, and a water supply amount decreasing loop are shown. Further, in FIG. 3, the vertical axis represents the control two-way valve 9
Of the valve opening degree V1 and the pressure set value P of the differential pressure sensor 12, and the abscissa indicates the times t1 and t2.

Set pressure value SV at startup of the secondary water supply pump 5
With the initial value PS. After the effect waiting time TO has elapsed, the presence or absence of the water supply request signal S1 is confirmed. If YES, the set pressure value SV is increased by ΔP2. NO, the standby request signal S
Check the presence of 2.

If YES, the set pressure value SV is not changed. If NO, the set pressure value SV is lowered by ΔP1. After the effect waiting time T2 has elapsed, the process returns to the signal confirmation loop again. After that, it repeats.

On the other hand, the water supply request signal S from the control two-way valve 9
1. The set pressure value SV is determined depending on the presence or absence of the standby request signal S2. Based on the difference between the set pressure value SV and the differential pressure signal of the differential pressure sensor 12, the input / output calculation unit 221 outputs P
The ID calculation is performed, and the rotation speed control signal of the inverter 6 is output.

When monitor input is used, monitor input signals are input from the monitor input signal section, the monitor display section, and the data storage section 23 to accumulate data, and the monitor display section displays trend graphs, numerical values, etc. I do.

In the case of remote operation, the monitor input signal and various parameter values are monitored from the first and second external communication units via the remote communication means 24 by the external operation terminal device 25 at a remote place. , Change the setting value.

As a result, as shown in FIG. 4, for example, as shown in FIG.
The conventional example is a constant differential pressure control, and the operating point moves like abc. On the other hand, the operating point of the present invention is ABC ...
It moves like.

Since the shaft power W∝water quantity Q × lift H is obtained, an air conditioning system having a remarkable power saving effect can be obtained as compared with the conventional constant speed control system.

In FIG. 4, G1 is the lift curve of the secondary water supply pump 5, and in this case, three pumps are combined.
Further, G2 is a pipe resistance curve.

Therefore, (1) The secondary pump controller 22 having the input / output calculation unit 221 for controlling the rotation speed of the inverter 6 is provided based on the opening signal of the control two-way valve 9 and the measurement signal of the differential pressure sensor 12. As a result, it is possible to obtain an air conditioning system that can be adjusted so that the minimum required water supply volume and pump head on the direct use side can be obtained, and that has a significant power saving effect.

(2) As compared with the conventional air conditioning system, the existing controller 21 for controlling the number of units can be used, and the input / output calculation unit 221 can be added. Therefore, an expansion can be easily performed and an inexpensive air conditioning system can be obtained.

(3) Since the monitor input signal section for inputting the monitor input signal, the monitor display section, and the data storage section 23 are provided in the input / output calculation section 221, monitor input and monitor data accumulation becomes easy, and adjustment is made. An air conditioning system that is easy to obtain is obtained.

(4) Since the operation display section 222 for displaying the operation status of the secondary pump controller 22 is provided, it is possible to obtain an air conditioning system in which the operation status of the secondary pump controller 22 can be easily grasped.

(5) Since the first external communication section 223 provided in the secondary pump controller 22 and remotely displaying the operation status via the remote communication means 24 is provided, the operation status of the secondary pump controller 22 is remotely displayed. It is possible to obtain an air conditioning system that can be easily grasped on the ground and can save labor and manpower.

(6) The secondary pump controller 22 is provided with the second external communication unit 224 which can set and change the parameters required for operation from a remote location via the remote communication means 24. It is possible to remotely control 22 and to obtain an air conditioning system that can save labor and labor for adjustment.

In the above embodiment, the remote communication means 24 is described as using the Internet, but the remote communication means 24 is not limited to this. For example, a direct telephone line may be used. Any communication means capable of sending a signal to the ground may be used.

Further, the above description merely shows specific preferred embodiments for the purpose of explaining and exemplifying the present invention. Therefore, the present invention is not limited to the above-mentioned embodiment, and many modifications are made without departing from the essence thereof.
It also includes deformation.

[0040]

As described above, according to the first aspect of the present invention.
According to the above, there are the following effects. (1) Since the secondary pump controller having the input / output calculation unit that controls the inverter based on the opening signal of the control two-way valve and the measurement signal of the differential pressure sensor is provided, the minimum required water supply amount on the direct use side is provided. It is possible to obtain an air conditioning system that can be adjusted so that the pump head can be adjusted, and has a significant power saving effect.

(2) If an existing controller for controlling the number of units can be used in the conventional air conditioning system and an input / output calculation unit, a monitor input signal unit, a monitor display unit, a data storage unit, an operation display unit, etc. are added. Because it is good, it is easy to add more and you can get an inexpensive air conditioning system.

According to claim 2 of the present invention, there are the following effects. Since the monitor input signal section for inputting the monitor input signal to the input / output calculation section, the monitor display section, and the data storage section are provided, the monitor input / output and monitor data accumulation becomes easy, and an air conditioning system with easy adjustment is obtained. To be

According to claim 3 of the present invention, there are the following effects. Since the operation display unit for displaying the operation status is provided on the secondary pump controller, it is possible to obtain the air conditioning system in which the operation status of the secondary pump controller can be easily grasped.

According to claim 4 of the present invention, there are the following effects. Since the first external communication unit provided in the secondary pump controller and remotely displaying the operation status via the remote communication means is provided, the operation status of the secondary pump controller can be easily grasped in a remote place, and labor saving can be achieved. An air conditioning system that can save labor is obtained.

According to claim 5 of the present invention, there are the following effects. Since the second external communication unit provided in the secondary pump controller and capable of setting and changing the parameters required for operation from a remote location via the remote communication means is provided, the secondary pump controller can be remotely operated and adjustments can be made. Therefore, an air conditioning system that can save labor and labor can be obtained.

Therefore, an air conditioning system having a power saving effect can be realized.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a main part configuration of an embodiment of an air conditioning system of the present invention.

2 is a flowchart of FIG. 1. FIG.

FIG. 3 is an operation explanatory diagram of FIG. 1.

FIG. 4 is an explanatory diagram of effects of FIG.

FIG. 5 is an explanatory diagram of a main part configuration of another embodiment of the present invention.

[Explanation of symbols]

1 Primary Water Pump 2 Return Header 3 Refrigerator or Cold / Hot Water Generator or Boiler 4 First Feed Header 5 Secondary Water Pump 6 Inverter 7 Second Feed Header 8 Flow Sensor 9 Control Two-Way Valve 11 Heat Exchanger 12 Difference Pressure sensor 13 Number controller 21 Number controller 22 Secondary pump controller 221 Input / output calculation section 222 Operation display section 223 First external communication section 224 Second external communication section 23 Monitor input signal section, monitor display section and data storage 24 and remote communication means 25 external operation terminal 26 signal converter abc of control two-way valve 9 ... operating point ABC ... operating point G1 head curve G2 of secondary water supply pump 5 pipe resistance curve H piping head pressure set value Q water quantity S1 Water supply request signal S2 Standby request signal SV Set pressure value t1 time t2 time V valve opening W axis power

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiromichi Kosaka 1-25-7 Hamamatsucho, Minato-ku, Tokyo In-house Asahi Industries (72) Inventor Shigehiro Yoshida 1-25-7 Hamamatsucho, Minato-ku, Tokyo Stock company Asahi Kogyo Co., Ltd. (72) Inventor Hiroshi Takahashi 2-9-32 Nakamachi, Musashino-shi, Tokyo Inside Yokogawa Electric Co., Ltd. (56) Reference JP-A-8-75223 (JP, A) JP-A-11- 83138 (JP, A) JP 7-175528 (JP, A) JP 2000-18674 (JP, A) JP 5-196277 (JP, A) JP 1-92803 (JP, A) Actual Kaisha 60-79638 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F24F 11/02 102

Claims (5)

(57) [Claims] 1. A primary water pump for sending cold water or hot water from a return header to a first feed header via a refrigerator, a hot / cold water generator or a boiler, and an inverter, and a primary water feed pump from the first feed header to a second feed water pump. A secondary water pump for sending cold water or hot water to the feed header, a control two-way valve provided between the second feed header and the return header, and cold water for the second feed header and the return header Alternatively, in an air conditioning system including a differential pressure sensor that measures a differential pressure of hot water, an air conditioning system that includes an input / output calculation unit that controls the inverter based on an opening signal of the control two-way valve and a measurement signal of the differential pressure sensor. An air conditioning system comprising a secondary pump controller. 2. The air conditioning system according to claim 1, further comprising a monitor input signal section for inputting a monitor input signal to the input / output calculation section, a monitor display section, and a data storage section. 3. The air conditioning system according to claim 1, further comprising an operation display unit provided on the secondary pump controller to display an operation status. 4. The first external communication unit, which is provided in the secondary pump controller and remotely displays an operation status via a remote communication unit, according to any one of claims 1 to 3. Air conditioning system as described. 5. A second external communication unit, which is provided in the secondary pump controller, for setting and changing a parameter required for operation from a remote location via a remote communication unit. Item 5. The air conditioning system according to any one of Items 4.