JP2000266228A - Thermal valve and control method for the thermal valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal valve capable of not only controlling a full opening or a full closing but also controlling an intermediate state. SOLUTION: This thermal valve comprises a control valve 3 provided with a plug bar 2 for adjusting a fluid motion; a thermal drive portion 5 for operating the plug bar 2 of the control valve 3 by an output shaft 4; and a control portion 6 for controlling the thermal driving portion 5. The thermal driving portion 5 is provided with a heater 11 and a thermal element 12 for reversibly displacing the output shaft 4 corresponding to a heating degree by the heater 11 and for operating the plug bar 2 through the output shaft 4. The control portion 6 is provided with a displacement quantity detection sensor 13 for detecting a displacement quantity of the output shaft 4 and a control body 14 for controlling a heating degree of the heater 11 based on the displacement quantity of the output shaft 4 detected by the displacement quantity detection sensor 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal valve and a method for controlling such a thermal valve, which is suitably used for a fan coil device or the like which is a heat radiation terminal of a water type central cooling and heating system.

[0002]

2. Description of the Related Art Conventionally, for example, in a fan coil device which is a heat radiation terminal of a water type central cooling and heating system, when supplying and circulating cold water (or hot water) to a heat exchanger, the cold water (or hot water) is supplied through a pipe. A control valve is provided in the piping to supply or circulate the water or to stop the supply. As such a control valve, an ON / OFF control type two-way valve is generally used as a simple mechanism. This ON / OFF control type valve is fully opened or fully closed when the switch is turned ON.
When it is turned off, it is fully closed or fully opened.

[0003]

There are various types of control valves for starting and stopping the flow of cold water (or hot water) in the pipes. As an intermediate controllable valve, there is a motor valve driven by a motor. This is a stepping motor, etc.
It is very expensive to include the driver, and it is not suitable as a control valve for a fan coil unit that is a terminal of an air conditioner. Therefore, a control valve which is located between the ON / OFF control and the stepping motor control and whose price is close to that of the ON / OFF valve and whose performance is infinitely close to that of the stepping motor control is provided.

The control valve provided here uses a thermal element and performs flow control in proportion to provide stable control especially at low flow rates. This control valve is extremely stable because it properly applies the amount of heat applied to the balance between the heat absorption and heat dissipation and the spring, and the heat source for driving, detects the valve opening with a strain gauge, and determines the valve opening by the feedback method. Valve opening can be secured.

[0005]

According to the thermal valve of the present invention, there is provided a control valve having a plug for adjusting the movement of a fluid, and a thermal drive for operating the plug of the control valve by an output shaft. And a control unit for controlling the thermal drive unit, wherein the thermal drive unit reversibly displaces the output shaft in accordance with a heater and the degree of heating by the heater, and controls the output shaft. A thermal element for operating the stopper rod through the control unit, wherein the control unit detects a displacement amount sensor that detects the displacement amount of the output shaft, and a displacement amount of the output shaft detected by the displacement amount sensor. Based on the above, a means for solving the above problem is provided with a control body for controlling the degree of heating of the heater.

Further, according to the thermal valve control method of the present invention, there is provided a control valve having a plug for adjusting the movement of a fluid, and a thermal drive unit for operating the plug of the control valve by an output shaft. Comprising a heater, a thermodynamic element for reversibly displacing the output shaft in accordance with the degree of heating by the heater, and operating the plug rod via the output shaft. In controlling the thermal valve comprising: a displacement amount detection sensor for detecting a displacement amount of the output shaft, and heating of the heater based on the displacement amount of the output shaft detected by the displacement amount detection sensor. Controlling the degree of the above is a means for solving the above problem.

According to the thermal valve of the present invention, the control section controls the degree of heating of the heater by the control body based on the displacement of the output shaft detected by the displacement detection sensor. With this, the output shaft can be reversibly displaced, and the stopper rod can be operated via the output shaft. Therefore, since the stopper rod for adjusting the movement of the fluid can be operated according to the degree of heating of the heater, the stopper rod can be operated in proportion.

According to the thermal valve control method of the present invention, the degree of heating of the heater is controlled on the basis of the displacement of the output shaft detected by the displacement detection sensor. And the stopper rod can be operated via the output shaft. Therefore, since the stopper rod for adjusting the movement of the fluid can be operated according to the degree of heating of the heater, the stopper rod can be operated in proportion.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a thermal valve according to the present invention will be described in detail based on an embodiment. FIG. 1 is a view showing an embodiment of a thermal valve according to the present invention. In FIG. 1, reference numeral 1 denotes a thermal valve.

The thermal valve 1 includes a control valve 3 having a plug 2 for controlling the movement of a fluid, and a thermal drive unit 5 for operating the plug 2 of the control valve 3 by an output shaft 4. And a control unit 6 for controlling the thermal drive unit 5.

In this embodiment, the control valve 3 is configured to be attached to pipes 7 for flowing a fluid such as air, and controls the movement (flow) of the fluid flowing between the pipes 7 and the plug rod 2.
It is for adjusting by. That is, the control valve 3 is provided with a hole 1 formed between the barriers 9 and 9 in the pipe 8.
0 is closed by the plug 2a formed at the lower end of the plug 2 to close the space between the pipes 7 and 7. Also, the plug 2 is raised to open the hole 10 so that the space between the pipes 7 and 7 is closed. Is configured to be opened.

The plug 2a of the plug 2 has a tapered bottom surface so that when the bottom surface of the plug 2a is located in the hole 10, the position of the hole 10a may vary. Can be continuously changed. That is, as shown in FIG. 1, the plug 2 rises from the state where the plug 2 a blocks the hole 10 as shown in FIG.
The opening degree of 0 changes (increases).
As the opening of the hole 10 increases, the flow rate between the pipes 7 can be increased.

The thermal drive unit 5 operates the stopper rod 2 of the control valve 3 by the output shaft 4 as described above.
1 and a thermal element 12. The thermal element 12 is constituted by a cylinder filled with a liquid such as oil, and the output shaft 4 is connected to the piston thereof.
Alternatively, the fixie itself is used as the output shaft 4.
Then, under such a configuration, the liquid in the thermodynamic element 12 reversibly expands in accordance with the degree of heating by the heater 11, whereby the output shaft 4 is pressed directly or indirectly. The displacement of the output shaft 4 causes the stopper rod 2 to operate as described above.

The control unit 6 detects the position of the output shaft 4 and detects the amount of displacement from the reference position to detect the amount of displacement of the output shaft 4, that is, the amount of displacement of the output shaft 4. A sensor 13 and a control body 14 having a control circuit for controlling the degree of heating of the heater 11 based on the displacement (elevation movement) of the output shaft 4 detected by the displacement detection sensor 13. It is a thing.

Here, the relationship between the flow rate of the fluid flowing between the pipes 7 and 7 and the opening degree of the hole 10 corresponding to the degree of rise of the plug 2a of the plug rod 2, the degree of heating by the heater 11 and the output shaft 4 , The displacement of the output shaft 4 and the plug 2a of the plug 2
The relationship with the degree of rise of the fluid is previously determined experimentally or by calculation, and the relationship between the degree of heating by the heater 11 and the flow rate of the fluid flowing between the pipes 7 is determined based on these results. Have been. Such a relationship is stored in the control body 14 in advance.

Therefore, the control body 14 uses the pipe 7,
When the flow rate of the fluid flowing between 7 is set, the control body 14 determines the degree of heating of the heater 11 so that the output shaft 4 is displaced so as to adjust the opening of the hole 10 so as to have the set flow rate, The heater 11 is controlled so that a current flows through the heater 11 to the determined degree.

Then, the heater 11 reaches a predetermined temperature under the control of the control body 14, heats the thermodynamic element 12, displaces the output shaft 4, and displaces (rises) the plug 2a of the plug 2 to form the hole. 10 is opened to a predetermined opening. Thus, a set flow rate of fluid flows between the pipes 7. Therefore, the thermal valve 1 of the present embodiment can perform not only control of whether the valve is fully opened and closed, but also intermediate control.

Next, an example in which the thermal valve 1 having such a configuration is used in a fan coil device will be described with reference to FIG. In this example, a fan coil unit 20 embedded in a ceiling is used as a fan coil device,
The fan coil unit 20 incorporates a cold / hot water coil 21. The cold / hot water coil 21 is connected to a cold / hot water forward pipe 22 and a cold / hot water return pipe 23 from a water-type central cooling / heating system or heat storage system (not shown).

The fan coil unit 20 has a built-in blower fan 24. The blower fan 24 allows the room air sucked from the indoor side to pass through the cold / hot water coil 21 to exchange heat, and the indoor air turned into the cool / hot air. Again into the room. Also, this blower fan 24
Is, for example, "strong",
The air volume is changed to “medium” and “weak”.

A controller 25 is attached to the fan coil unit 20, and the controller 25 can be operated by a room thermo 26 provided in the room. The room thermo 26 includes a room temperature detection sensor 27 for automatic air volume switching, a room temperature display section 28, and a room temperature setting section 2
9. An operation switch 30 is provided. The room thermo 26 uses signals from these switches and the like as information for setting the operation mode of the fan coil unit 20 as
Send to controller 25.

On the other hand, the controller 25
3 is connected to a cooling / heating determination sensor (for example, a bimetal sensor) 31.
1 detects the temperature of the cold / hot water outgoing pipe 22. The heat operated valve 1 is attached to the cold / hot water return pipe 23, and a control unit 6 (not shown) of the heat operated valve 1 is connected to the controller 25. Under such a configuration, the operation of the thermal valve 1 is performed by the ram thermo 26 via the controller 25. Here, the thermal valve 1 opens and closes the cold / hot water return pipe 23 and adjusts the opening thereof to supply / stop the cold / hot water to the cold / hot water coil 21 and further adjust the supply amount. Has become.

The controller 25 has an outlet temperature detection sensor (for example, a sensor attached to the cold / hot water return pipe 23).
A thermistor 32 is connected, and the outlet temperature detection sensor 32 detects the temperature of the cold and hot water passing through the cold and hot water return pipe 23.

The operation of the fan coil unit 20 configured as described above will be described. When the indoor load is large, such as at the time of startup, the blower fan 24 is operated by the controller 25 at “strong”. The magnitude of the indoor load is grasped by the controller 25 based on, for example, a temperature difference between the detected indoor temperature and the set temperature at that time, and the controller 25 sends a control signal to the blower fan 24 based on the temperature difference. When the room temperature reaches the set temperature, the blower fan 24 automatically performs a “medium” or “weak” operation signal according to a control signal from the controller 25.

When the amount of air blown by the blower fan 24 decreases after the room temperature reaches the set temperature, the amount of air passing through the cold / hot water coil 21 decreases. On the other hand, since the amount of cold / hot water supplied to the cold / hot water coil 21 is constant, the heat exchange rate decreases, and the cold / hot water that has not been sufficiently heat-exchanged is returned from the cold / hot water coil 21.

At this time, the outlet temperature detecting sensor 32 attached to the cold / hot water return pipe 23 detects the temperature of the cold / hot water returned from the cold / hot water coil 21. If the temperature difference between this temperature and the inlet temperature is small, Further, when the sensor 32 detects that the temperature is equal to or lower than the preset return compensation temperature (cold water) or higher (hot water), the controller 25 determines that sufficient heat exchange has not yet been performed, and notifies the controller 6. By sending a signal, the opening degree of the thermal valve 1 is controlled to be small or closed. As a result, the cold / hot water having cooling / heating capacity that has not yet been used up and the cold / hot water that does not satisfy the compensation temperature stay in the cold / hot water coil 21 for a long time or are stored, so that heat exchange is sufficiently performed with the blast air. Will be.

When the outlet temperature reaches the predetermined temperature and satisfies the compensation temperature, the controller 25 increases the degree of opening of the thermal valve 1 again and increases the amount of supply of new cold / hot water to the cold / hot water coil 21. . Then, the outlet temperature is detected again, and the above operation is repeated.

In such a fan coil unit 20, since the thermal valve 1 of the present invention, which can perform intermediate control, is used, the outlet temperature detecting sensor attached to the cold / hot water return pipe 23 is used. At 32, the temperature of the cold / hot water returned from the cold / hot water coil 21 is detected, and when the temperature difference from the inlet temperature is small and the compensation temperature is not satisfied, the controller 25 determines that sufficient heat exchange has not been performed yet. Judge by
The heat valve 1 allows sufficient exchange of the hot and cold water having the cooling and heating capacity that has not been used up, and can satisfy the compensation temperature, whereby the cooling and heating capacity of the circulating hot and cold water can be sufficiently drawn out. The heat exchange rate in the circulation amount can be increased.

Therefore, it is possible to increase the temperature difference between the inlet and the outlet of the chilled / hot water coil 3 and to ensure a compensation temperature. In the case of the heat storage system, the heat storage capacity can be reduced, and Without disturbing the temperature stratification of the large temperature difference stratified heat storage tank, which was a problem until then, the amount of circulating water in the cold / hot water system can also be reduced, and the pump capacity, initial costs associated with downsizing of the pipe size, and In addition, the running cost can be reduced by reducing the driving power.

In the example shown in FIG. 2, the case where the thermal valve of the present invention is used for a fan coil device has been described. It can be used in any place that requires dynamic control (including ON / OFF control).

[0030]

As described above, in the thermal valve according to the present invention, the control unit controls the degree of heating of the heater by the control body based on the displacement of the output shaft detected by the displacement detection sensor. Since the control is performed, the output shaft can be reversibly displaced by this control, and the stopper rod can be operated via the output shaft. Therefore, the stopper rod for controlling the movement of the fluid is operated according to the degree of heating of the heater, and the stopper rod is operated in proportion to ON / OFF.
Intermediate control as well as OFF control can be performed. In addition, since it is structurally based on an ON / OFF valve and is configured by adding necessary components such as a heater, a thermal element and a displacement detection sensor, the structure is simple and the cost is lower than that of a conventional proportional valve. It will be.

In the method of controlling a thermal valve according to the present invention, the degree of heating of the heater is controlled based on the displacement of the output shaft detected by the displacement detection sensor. Displaced and the plug can be operated via the output shaft. Therefore, it is possible to operate the stopper rod for adjusting the movement of the fluid according to the degree of heating of the heater, and to operate the stopper rod proportionally to perform not only ON / OFF control but also intermediate control.

The large temperature difference stratification which is an important point of the function and the control of the large temperature difference stratification type heat storage tank which has been a problem of the fan coil control by the large temperature control and the return temperature compensation control shown in FIG. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a thermal valve according to the present invention.

FIG. 2 is a schematic configuration diagram for explaining an example of a case where the thermal valve shown in FIG. 1 is used in a fan coil device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Thermal valve, 2 ... Tap rod, 3 ... Control valve, 4 ... Output shaft, 5 ...
Thermal drive unit, 6 Control unit, 11 Heater, 12 Thermal element, 13 Displacement detection sensor, 14 Control body

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[Procedure amendment]

[Submission date] March 31, 2000 (200.3.3.
1)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

[0005]

In the thermal valve according to the present invention , the movement of the fluid is adjusted by adjusting the opening of the valve hole in the pipe.
A stopper is formed at one end to allow the tube to slide.
A control valve having a plug rod inserted and the other end protruding to the outside; and a control valve connected to the other end of the plug rod of the control valve via an output shaft.
A thermal drive unit for operating the stopper rod by an output shaft,
Consists of a control unit for controlling the heat if unit, the heat if unit, a heater heating degree is controlled by a current, an internal
With a cylinder and piston filled with a heat transfer medium.
A thermodynamic element for reversibly displacing an output shaft connected to the piston in accordance with the degree of heating by the heater provided at the outer end of the cylinder, and operating the plug rod via the output shaft. A control unit that controls a degree of heating of the heater based on a displacement amount detection sensor that detects a displacement amount of the output shaft, and a displacement amount of the output shaft detected by the displacement amount detection sensor. The provision of a main body is a means for solving the above-mentioned problem.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

In the method of controlling a thermal valve according to the present invention , the movement of the fluid is adjusted by adjusting the opening of the valve hole in the pipe.
A stopper is formed at one end to allow the tube to slide.
A control valve having a plug rod inserted and the other end protruding to the outside; and a control valve connected to the other end of the plug rod of the control valve via an output shaft.
A heat drive unit that operates the stopper rod by an output shaft, wherein the heat drive unit controls the degree of heating by an electric current.
A heater that is, cylinder thermally activated medium is filled inside
.Having a piston and being provided at the outer end of the cylinder
Serial according to the degree of heating by the heater is displaced an output shaft connected to reversibly the piston, Netsudoben control method comprising a thermally activated element that operates the stopper rod through the output shaft And providing a displacement amount detection sensor for detecting a displacement amount of the output shaft, and controlling a degree of heating of the heater based on the displacement amount of the output shaft detected by the displacement amount detection sensor. This was the solution to the problem.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

The thermal drive unit 5 operates the stopper rod 2 of the control valve 3 by the output shaft 4 as described above.
1 and a thermal element 12. The thermal element 12 is constituted by a cylinder filled with a liquid such as oil, and the output shaft 4 is connected to the piston thereof.
Or in which the piston itself was the output shaft 4. Then, with such a configuration, the heater 11
When the liquid in the thermodynamic element 12 expands reversibly in accordance with the degree of heating, the output shaft 4 is directly or indirectly pressed and displaced, and the output shaft 4 is displaced.
, The stopper rod 2 operates as described above.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) F24F 11/02 102 F24F 11/02 102L (72) Inventor Norio Kuzuoka 1-2-1 Moto-Akasaka, Minato-ku, Tokyo 7 Kashima Construction Co., Ltd. (72) Inventor Tatsu Murasawa 2-5-1-12 Kyobashi, Chuo-ku, Tokyo Toyo Thermal Industry Co., Ltd. (72) Masaharu Iwamiya 2-12 Kyobashi, Chuo-ku, Tokyo No. 72 Toyo-Hot Industrial Co., Ltd.Inventor Kenichi Uchiyama 2-5-1-12 Kyobashi, Chuo-ku, Tokyo Toyo-Hot Industry Co., Ltd. (72) Inventor Tomasa Saito Company F-term in SOWA Engineering (reference) 3H057 AA02 BB09 BB26 BB32 CC07 DD01 EE10 FC05 FD05 FD10 FD11 HH03 HH18 3H066 AA01 BA17 BA38 3L060 AA06 CC05 DD02 EE33 3L070 BC2 1 BC30 DE03 DE06 DG06

Claims (2)

[Claims] 1. A control valve having a plug for regulating the movement of a fluid, a thermodynamic drive for operating the plug of the control valve by an output shaft, and a control for controlling the thermodynamic drive. A thermodynamic drive unit, comprising: a heater; and a thermodynamic element for reversibly displacing the output shaft in accordance with the degree of heating by the heater, and operating the stopper rod via the output shaft. The control unit controls a degree of heating of the heater based on a displacement amount detection sensor that detects a displacement amount of the output shaft, and a displacement amount of the output shaft detected by the displacement amount detection sensor. A thermal valve comprising a control body. 2. A control valve having a plug for regulating the movement of a fluid, and a thermal drive unit for operating said plug of said control valve by an output shaft, wherein said thermal drive unit is provided. , A heater, and a thermal valve that reversibly displaces the output shaft in accordance with the degree of heating by the heater, and a thermal element that operates the plug rod via the output shaft. A displacement amount detection sensor for detecting a displacement amount of the output shaft is provided, and a degree of heating of the heater is controlled based on the displacement amount of the output shaft detected by the displacement amount detection sensor. To control the thermal valve.