JP3298026B2 - Operating device for cold / hot water pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device for a chilled / hot water pump, and more particularly to a driving device for a chilled / hot water pump capable of changing the rotation speed of the chilled / hot water pump.

[0002]

2. Description of the Related Art Generally, cold water or hot water produced by an absorption chiller / heater is carried to a heat load via a cold / hot water pipe and supplied to the heat load.

FIG. 3 is a system diagram showing a conventional operation device of a cold / hot water pump.

[0004] In FIG.
Cold water or hot water (hereinafter referred to as cold / hot water) can be produced.
The chilled / hot water produced by the absorption chilled / hot water machine 101 passes through a cold / hot water outgoing pipe 103 provided with an electric three-way valve 102, and then passed through a fan coil unit 1 provided with an electromagnetic two-way valve 104.
05. The hot / cold water supplied with heat energy to the heat load by the fan coil unit 105 is sucked into a cold / hot water pump 107 via a cold / hot water return pipe 106, then pressurized and returned to the absorption type cold / hot water machine 101. The electric three-way valve 102 is connected to a cold / hot water return pipe 106 on the suction side of a cold / hot water pump 107. Electric three-way valve 1
02 is connected to the monitoring device 108, and the monitoring device 1
08 can monitor the opening and closing of each electromagnetic two-way valve 104.

According to such a device for operating a cold / hot water pump, when the heat load is reduced, the fan coil unit 105
The electromagnetic two-way valve 104 attached to the fan is closed, and the supply of cold and hot water supplied to the fan coil unit 105 is stopped.

[0006] Since the supply of the cold and hot water to each fan coil unit 105 is stopped, the total amount of water supply can be reduced, and the input of the cold and hot water pump 107 can be reduced.

On the other hand, since the minimum circulation amount Vmin is set in the absorption chiller / heater 101, if the electromagnetic two-way valve 104 is sequentially closed, the cooling / heating water amount may fall below the minimum circulation amount Vmin. Accordingly, in such a case, the opening and closing of the electromagnetic two-way valve 104 is monitored by the monitoring device 108, and when the amount of cold and hot water approaches the minimum circulation amount Vmin, the electric three-way valve 102 is opened from the A side to the B side to open Fan coil unit 10
5, the minimum circulation amount Vmin required for the absorption-type water heater / heater 101 is secured.

[0008]

However, at the time of heating, when the heat load of the whole system is very small, even if the absorption type chiller / heater 101 is stopped, the chilled / hot water pump 107 is not used.
, The hot water is heated.
When the outlet hot water temperature of the absorption chiller / heater 101 is, for example, 60
Even if the operation of the absorption-type water heater / heater 101 is stopped assuming that the temperature reaches [degree C], the hot water temperature continues to rise due to residual heat,
In some cases, the temperature may exceed 100 [degree C]. Such high-temperature hot water is supplied to the electric three-way valve 102,
Circulating through the fan coil unit 105 through the
There is a drawback that each element constituting the cold / hot water circuit is adversely affected.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned drawbacks and to provide an operating device of a chilled / hot water pump capable of reducing unnecessary temperature rise during heating and reducing a cooling load during cooling.

[0010]

In order to achieve the above-mentioned object, an operation apparatus for a chilled / hot water pump according to the present invention comprises an absorption type chilled / hot water machine and a fan coil unit having an electromagnetic two-way valve. By circulating cold or hot water produced by an absorption chiller / heater, heat is supplied from the fan coil unit to a heat load, and the opening of the electromagnetic two-way valve is monitored by a monitoring device. In the operating device of the chilled / hot water pump, which controls the opening degree of the three-way valve for the chilled water or hot water to bypass the fan coil units and thereby ensure the minimum chilled / hot water flow rate of the absorption chiller / heater, A temperature detection sensor that detects the temperature of the cold or hot water outlet;
A speed-controlled chilled / hot water pump capable of supplying chilled / hot water to a heat load, and based on a detection signal from the temperature detection sensor, when the chilled / hot water temperature exceeds a predetermined reference value during heating or when the chilled / hot water is cooled. When the temperature falls below a predetermined reference value, the electromagnetic two-way valve is closed and cold or hot water is
Circulated bypassing the fan coil unit
On the condition, a control device capable of reducing the rotation speed of the speed control type chilled / hot water pump to a speed at which a required minimum circulation amount can be secured is provided.

The control device may be configured to reduce the frequency of alternating current applied to the motor of the speed-controlled chilled / hot water pump, or may be configured to convert the number of poles of the motor of the speed-controlled chilled / hot water pump. It is desirable.

[0012]

According to the present invention, the temperature of the chilled / hot water from the absorption type chilled / hot water machine is monitored, and when the temperature exceeds or falls below a predetermined temperature, the speed of the chilled / hot water pump is reduced to reduce the electric input. Has been reduced.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments.

FIG. 1 is a system diagram showing an embodiment of the operating device for a cold / hot water pump according to the present invention.

Referring to FIG. 1, an absorption-type hot / cold water heater 1 can produce cold / hot water. The hot and cold water produced by the absorption hot and cold water machine 1 can be supplied to a fan coil unit 5 having an electromagnetic two-way valve 4 after passing through a cold and hot water outlet pipe 3 provided with an electric three-way valve 2. The cold / hot water supplied to the heat load by the fan coil unit 5 is supplied to the cold / hot water return pipe 6.
After being sucked into the chilled / hot water pump 7 through the pump, it is pressurized and returns to the absorption chilled / hot water machine 1. Thus, the absorption-type hot / cold water heater 1
Heat is supplied from the fan coil unit 5 to the heat load by circulating the hot and cold water produced by the absorption hot and cold water machine 1 between the fan coil unit 5 and the fan coil unit 5 having the electromagnetic two-way valve 4. The electric three-way valve 2 is connected to the cold / hot water return pipe 5 on the suction side of the cold / hot water pump 7. A monitoring device 8 is connected to the electric three-way valve 2, and the monitoring device 8 monitors opening and closing of each electromagnetic two-way valve 4.

Further, a temperature detection sensor 11 is provided at a cold / hot water outlet of the absorption chiller / heater 1, and the temperature detection sensor 11 detects a chill / hot water outlet temperature of the absorption chiller / heater 1. I have. Further, the temperature detection sensor 11 is connected to a control device 12. Based on the detection signal from the temperature detection sensor 11, the controller 12 determines whether the temperature of the cold / hot water exceeds a predetermined reference value during heating or the temperature of the cold / hot water becomes lower than a predetermined reference value during cooling. Then, the rotation speed of the electric motor of the speed control type cold / hot water pump 7 can be reduced.

The control device 12 is constituted by an inverter employing a V / f control method, a vector control method, or the like, so that the frequency of an alternating current applied to the electric motor of the speed control type cold / hot water pump 7 can be varied. It has become. In addition,
The control device 12 may convert the number of poles of the electric motor of the speed control type cold / hot water pump 7.

In this embodiment, a speed control type cold / hot water pump is used as the cooling water pump 7, and the discharge flow rate of the pump can be varied according to the rotation of the electric motor.

The operation of the operation device of the cold / hot water pump will be described.

When the heat load is reduced during heating, the electromagnetic two-way valve 4 attached to the fan coil unit 5 is closed, and the supply of cold and hot water supplied to the fan coil unit 5 is stopped. When the cold / hot water is no longer supplied to each fan coil unit 5 as described above, the entire water supply amount is reduced, and the input of the cold / hot water pump 7 can be reduced.

Further, the absorption chiller / heater 1 has a minimum circulation amount V
Since min is set, if each electromagnetic two-way valve 4 is sequentially closed, the amount of cold and hot water may fall below the minimum circulation amount Vmin. Therefore, in such a case, the opening and closing of the electromagnetic two-way valve 4 is monitored by the monitoring device 8, and when the amount of cold and hot water approaches the minimum circulation amount Vmin, the electric three-way valve 2 that normally communicates from the A side to the C side. Are connected from the A side to the B side to bypass the fan coil units 5 to secure the minimum circulation amount Vmin required for the absorption type chiller / heater 1.

On the other hand, the temperature of the chilled / hot water output from the absorption type chilled / hot water machine 1 is detected by a temperature detecting sensor 11 and input to the control device 12. As shown in FIG. 2, the control device 12 always determines whether or not the temperature of the cold / hot water is equal to or higher than 60 degrees C (step 300). Here, the control device 1
2, if the temperature of the cold / hot water is not 60 ° C. or more based on the detection signal (Step 300; N), the frequency of the power supplied to the motor of the speed-controlled cold / hot water pump 7 is rated; Normal rotation (step 301).

However, if the control device 12 determines that the temperature of the cold or hot water is equal to or higher than 60 ° C. based on the detection signal (step 300; Y), it lowers the frequency to a predetermined value (step 302). ). Thereby, the rotation speed of the speed control type cold / hot water pump 7 is reduced, and the circulating hot water flow rate is reduced. Thereby, the influence on each element of the cold / hot water circuit is reduced. Further, the amount of electric power supplied to the speed control type cold / hot water pump 7 is reduced.

Although the above-mentioned heating time has been considered, in the case of cooling, in order to prevent the temperature of the chilled water from rising, the absorption type chiller / heater 1 may be operated in the cooling mode. It is not energy saving.

Therefore, the chilled water outlet temperature of the absorption type chilled / hot water machine 1 is detected by the temperature detecting sensor 11 and the detection signal is input to the control device 12. The control device 12 reduces the rotation amount of the electric motor of the speed-controlled chilled / hot water pump 7 when the temperature reaches a certain temperature or lower based on the detection signal, thereby suppressing an unnecessary circulation amount of chilled / hot water (chilled water). In addition, the temperature of cold / hot water (cold water) is prevented from rising.

As described above, in this embodiment, when the heat load is light and the operation of the absorption-type water heater / heater 1 is stopped,
By reducing the speed of the speed control type hot / cold water pump 7, a minimum necessary circulation amount is secured, and an unnecessary circulation water amount is prevented from flowing into the cold / hot water circuit. As a result, abnormal temperature rise during heating can be prevented, and unnecessary temperature rise of cold and hot water during cooling can be prevented.

[0027]

As described above, according to the present invention, when the heat load is light and the operation of the absorption chiller / heater is stopped, the speed of the speed control type chiller / heater is reduced. It has the effect of securing the minimum required circulation volume, preventing the unnecessary circulating water volume from flowing into the cooling and heating water circuit, preventing abnormal temperature rise during heating, and preventing unnecessary temperature rise of cooling and heating water during cooling. is there.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an embodiment of an operating device for a cold / hot water pump according to the present invention.

FIG. 2 is a flowchart for explaining the operation of the embodiment.

FIG. 3 is a system diagram showing an operation device of a conventional cold / hot water pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Absorption chiller / heater 2 Electric three-way valve 3 Cold / hot water supply pipe 4 Electromagnetic two-way valve 5 Fan coil unit 6 Cold / hot water return pipe 7 Speed control type cold / hot water pump 8 Monitoring device 11 Temperature detection sensor 12 Control device

Claims (3)

(57) [Claims] 1. circulating cold water or hot water produced by the absorption type water heater between an absorption type water heater and a fan coil unit provided with an electromagnetic two-way valve, so that the fan coil unit Along with supplying heat to the heat load, the opening of the electromagnetic two-way valve is monitored by a monitoring device, and the monitoring device controls the opening of the three-way valve with cold or hot water to bypass the fan coil units. An operation device for a chilled / hot water pump capable of ensuring a minimum chilled / hot water flow rate of the absorption chilled / hot water machine, a temperature detection sensor for detecting a chilled / hot water outlet temperature of the absorption chilled / hot water machine, and a speed control capable of supplying the chilled / hot water to a heat load. Type cold / hot water pump, based on a detection signal from the temperature detection sensor, when the cold / hot water temperature exceeds a certain reference value during heating, or when the cooling / hot water temperature is a predetermined reference value during cooling. When the following, the electromagnetic two-way valve is closed and the cold or hot water is
Circulation bypassing the fan coil unit
Under the condition, the rotation speed of the speed control type cold and hot water pump ,
An operating device for a cold / hot water pump, comprising: a control device that can reduce the speed to a speed at which a required minimum circulation amount can be secured . 2. The operating device for a chilled / hot water pump according to claim 1, wherein the control device is configured to reduce a frequency of an alternating current applied to a motor of the speed controlled chilled / hot water pump. 3. The chilled / hot water pump operating device according to claim 1, wherein the control device is configured to be capable of changing the number of poles of a motor of the speed control type chilled / hot water pump.