JPH0749209Y2 - Boiler water tank temperature controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a temperature control device for a boiler water tank in a boiler water supply system.

<Prior Art> When supplying boiler water to a boiler, the water temperature is raised to 60 to 80 ° C to improve boiler efficiency. As a method of raising the temperature, there are an economizer that uses the heat generated by the boiler and a method that uses the heat of condensate from drain recovery.

However, in a small boiler without an economizer, as shown in FIG. 4, live steam is directly introduced from the boiler A, and the solenoid valve B, the silencer C, and the thermosensor D are combined to control the feed water temperature.

In FIG. 4, E is a boiler water supply tank, F is a boiler water supply pipe that supplies boiler water from the boiler water supply tank E to the boiler A, and G is live steam that supplies live steam from the boiler A to the boiler water supply tank E. Inlet pipe, H is control plate, I is pump, J
Is a water treatment device, and L is a main pipe for utilizing live steam from the boiler A as a fluid to be heated.

<Problems to be Solved by the Invention> In the conventional boiler water supply system, the larger the amount of water supplied to the boiler A, the larger the amount of live steam required. Along with this, the number of times the solenoid valve B is operated increases, and the durability of the solenoid valve B is greatly reduced, which requires replacement in a short period of time.

Further, the operation of the solenoid valve B is accompanied by a sudden opening and closing of the valve, and a water hammer is generated in the pipe, which causes a reduction in durability of each device.

Further, since the feed water temperature is controlled by combining the solenoid valve B, the silencer C and the thermo sensor D, the piping becomes complicated.

Therefore, in view of the above problems, the present invention aims to provide a temperature control device for a boiler water supply tank in which water hammer is less likely to occur in a pipe, the durability of each device (system) is improved, and the pipe is easy. And

<Means for Solving the Problems> The means for solving the problems of the present invention is as shown in FIG. 1 to FIG.
A boiler A and a boiler water supply tank E were provided, a boiler water supply pipe F for supplying boiler water from the boiler water supply tank E to the boiler A, and a live steam introducing pipe G for guiding live steam from the boiler A to the boiler water supply tank E. In the hot water supply system,
A temperature adjusting valve K is provided which is connected to the end of the live steam introducing pipe G at the submerged position of the boiler water supply tank E and controls the supply water temperature of the boiler water. The temperature adjustment valve K adjusts the temperature of the boiler water supply tank E to the water temperature. It is provided with a heat-responsive body 9 that responds and a valve 6 that stops the introduction of live steam into the boiler water supply tank E by the operation of the heat-responsive body 9.

<Operation> In the above problem solving means, when supplying boiler water to the boiler A, the water temperature is raised to 60 to 80 ° C. to improve the boiler efficiency.

At the initial stage when the live steam from the boiler A is ventilated to the live steam introducing pipe G, the water temperature of the boiler feed water tank E is low, and the heat-sensitive responder 9 of the temperature control valve K contracts in a low temperature state, so the valve 6 is In the valve open state, steam from the boiler A is blown into the boiler water supply tank E, the water in the boiler water supply tank E is heated, and is supplied to the boiler A as boiler water through the boiler water supply pipe F.

After that, the water temperature of the boiler water supply tank E is set to the set value (60 to 80
When the temperature rises to a value slightly lower than (.degree. C.), the temperature control valve K operates. That is, the amount of live steam from the boiler A proportional to the expansion / contraction state of the heat-sensitive responder 9 of the hot water regulating valve K that responds to the water temperature of the boiler water supply tank E is blown from the temperature regulating valve K. Finally, the valve 6 is closed when the water temperature of the boiler water supply tank E reaches the set value.

As described above, the heat-sensitive reaction of the temperature control valve K by the amount of heat consumed by supplying water to the boiler A as the boiler water out of the water in the boiler water supply tank E (that is, the amount of heat of the liquid to be heated becomes low temperature). The body 9 expands and contracts, the valve 6 opens and closes, and the amount of heat of live steam from the boiler A is supplied to the water in the boiler water supply tank E, so that the water temperature in the boiler water supply tank E is maintained at a substantially constant level. The supply temperature is controlled.

<Embodiment> An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is an overall configuration diagram of a boiler water supply system using a temperature control device for a boiler water supply tank according to an embodiment of the present invention,
FIG. 2 is a vertical sectional view showing the opened state of the temperature adjusting valve, and FIG. 3 is a vertical sectional view showing the closed state of the temperature adjusting valve.

A boiler water supply system in which the temperature control device for the boiler water supply tank of the present embodiment is used will be described. As shown in FIG. 1, boiler water is supplied from the boiler water supply tank E to the boiler A and the boiler water supply tank E. A boiler water supply pipe F and a live steam introduction pipe G for guiding live steam from the boiler A to the boiler water supply tank E are provided.

In FIG. 1, H is a control plate for controlling the boiler A, I is a pump for sending boiler water from the boiler feed water tank E to the boiler A, J is a water treatment device, and L is live steam from the boiler A to be heated. This is the main pipe for use as a fluid.

The temperature controller for the boiler water supply tank of this embodiment is connected to the end of the live steam introducing pipe G at the submerged position of the boiler water supply tank E, as shown in FIGS. A temperature adjusting valve K for controlling is provided, and the temperature adjusting valve K is provided with a thermosensitive responsive body 9 that responds to the water temperature of the boiler feedwater tank E, and the introduction of live steam into the boiler feedwater tank E by the operation of the thermosensitive responsive body 9. It is provided with a valve 6 for stopping.

Here, the temperature control valve K will be mainly described with reference to FIGS. 2 and 3, 1 is a cylindrical housing, which is composed of a base 2 having a circular inlet 1a and a lid 3 having a square outlet 1b. Reference numeral 4 denotes a valve seat screwed into the center of the upper side of the base body 2. A valve guide hole 4a is formed in the center of the valve seat, and a valve hole 5 that connects the guide hole 4a and the inlet 1a is formed. The valve hole 5 has a smaller diameter than the guide hole 4a. The lower portion of the guide hole 4a has a larger diameter than the cylindrical portion 6c of the valve 6 whose lower portion is a conical portion 6b, and a plurality of radial outflow holes 4b are formed in the guide hole 4a in a uniform distribution. ing.

An adjusting bolt 7 is screwed into a threaded portion of the adjusting hole 3a of the lid body 3, an adjusting tool engaging groove 7a is provided at an upper end thereof, and a concave hole 7b is provided at a lower portion thereof.

Thus, in the heat-sensitive chamber 8 formed by being surrounded by the lid body 3 and the valve seat 4, etc., the valve rod 6a is a concave hole in the upper center of the valve element 6.
A lower end portion is slidably fitted in 6e, and an upper end portion is slidably fitted in a concave hole 7b of the adjusting bolt 7.

A heat sensitive body 9 made of a bimetal laminated body, which is bent and expanded substantially proportionally in response to a temperature rise of the liquid to be heated, is externally fitted to the central portion of the valve rod 6a, and the upper end surface of the heat sensitive body 9 is adjusted. The lower end surface of the thermosensitive body 9 is brought into contact with the lower end of the bolt 7, and the E ring 10 engaged with the valve rod 6a is brought into contact therewith.

That is, the valve element 6 that opens and closes the valve hole 5 in accordance with the operation of the thermosensitive body 9 is provided.

Further, there is provided a sudden change thermosensitive element 11 made of a shape memory alloy which expands and forcibly moves the valve 6 to the valve closing side only when the temperature inside the thermosensitive chamber rises to a predetermined abnormal temperature. The abrupt change thermosensitive element 11 is formed in a coil shape and is interposed between the thermosensitive body 9 and the lid 3 of the housing 1, so that the abrupt change thermosensitive element 11 and the thermosensitive body 9 are connected in series. The sudden change thermosensitive element 11, the thermosensitive body 9, the valve rod 6a and the valve 6 are arranged to press the valve 6 against the total weight of the sudden change thermosensitive element 11 made of shape memory alloy. A bias spring 12 for opening the valve is provided between the spring receiving surface of the valve seat 4 and the flange-shaped spring receiving portion 6d of the valve element 6. Furthermore, a porous material having pores 13a and mesh holes 13b so as to cover the outlet 1b
13 is stretched and fixed.

In the above boiler water supply system, when supplying boiler water to the boiler A, in order to improve the boiler efficiency,
Water is raised by raising the water temperature to 80 ° C.

At the initial stage when the live steam from the boiler A is ventilated to the live steam introducing pipe G, the water temperature of the boiler feed water tank E is low, and the heat-sensitive responder 9 of the temperature control valve K contracts in a low temperature state, so the valve 6 is In the valve open state, steam from the boiler A is blown into the boiler water supply tank E, the water in the boiler water supply tank E is heated, and is supplied to the boiler A as boiler water through the boiler water supply pipe F.

After that, the water temperature of the boiler water supply tank E is set to the set value (60 to 80
When the temperature rises to a value slightly lower than (.degree. C.), the temperature control valve K operates. That is, the amount of live steam from the boiler A proportional to the expansion / contraction state of the thermosensitive actuator 9 of the temperature control valve K that responds to the water temperature of the boiler water supply tank E is blown from the temperature control valve K. Finally, the valve 6 is closed when the water temperature of the boiler water supply tank E reaches the set value.

As described above, the heat-sensitive reaction of the temperature control valve K by the amount of heat consumed by supplying water to the boiler A as the boiler water out of the water in the boiler water supply tank E (that is, the amount of heat of the liquid to be heated becomes low temperature). The body 9 expands and contracts, the valve 6 opens and closes, and the amount of heat of live steam from the boiler A is supplied to the water in the boiler water supply tank E, so that the water temperature in the boiler water supply tank E is maintained at a substantially constant level. The supply temperature is controlled.

In the above description, the operation of the temperature control valve K will be described in detail. Since the water in the boiler water supply tank E having a temperature equal to or lower than the set temperature reaches the heat-sensitive chamber 8 at the time of heating at the initial stage of ventilation, Since the temperature inside 8 is low, it contracts and the valve hole 5
The valve rod 6a is moved upward by the combined force of the pressure exerted on the valve 6 by the auxiliary force of the bias spring 12, the valve 6 is separated, and the live steam from the boiler A is discharged from the radial outflow holes 4b to the heat-sensitive chamber. Into 8,
Then, it is finely crushed through the porous material 13 at the outlet 1b and discharged into the boiler water supply tank E.

At this time, since the bubbles of steam are finely crushed, the condensation of the bubbles in the water in the boiler water supply tank E is efficiently performed, and the heating efficiency of the water in the boiler water supply tank E is improved.
Also, the noise and vibration during condensation are reduced due to the finer bubbles.

Then, as the water in the heat-sensitive chamber 8 gradually rises in temperature,
The thermo-responsive bag 9 gradually expands, and the valve rod is inserted through the E-ring 10.
Since the valve 6a is pushed downward, the valve element 6 is forcibly seated and the valve hole 5 is closed.

In this way, the valve element 6 is repeatedly opened and closed, and by repeatedly supplying and stopping live steam from the boiler A, the temperature of the water in the boiler water supply tank E is kept substantially constant.

Therefore, because the temperature of the boiler water supply is controlled by the temperature control valve, vibration does not easily occur in the boiler water supply tank, and unlike the solenoid valve, the valve does not open and close rapidly, so water hammer is less likely to occur. The durability of the system is improved.

In addition, since it is not necessary to control the supply temperature of boiler water by combining a solenoid valve, a silencer, and a thermosensor as in the conventional case, piping becomes easy.

<Effect of the Invention> As is clear from the above description, according to the present invention, the temperature adjusting valve is connected to the end of the live steam introducing pipe at the submerged position of the boiler water supply tank to control the temperature of the boiler water supply. Since the regulating valve has a heat-sensitive responder that responds to the water temperature of the boiler water tank, and a valve that stops the introduction of live steam into the boiler water tank by the operation of the heat-responsive body, Of the water, the heat-sensitive responder of the temperature control valve expands and contracts by the amount of heat consumed by supplying water to the boiler as boiler water (that is, the amount of heat corresponding to the low temperature of the liquid to be heated), the valve opens and closes, and the boiler opens and closes. The heat of live steam from the boiler is supplied to the water in the water supply tank, the water temperature in the boiler water supply tank is kept substantially constant, and the boiler water supply temperature is controlled.

Therefore, since the temperature of the boiler water supply is controlled by the temperature control valve, vibration does not easily occur in the boiler water supply tank, and unlike the solenoid valve, the valve does not open and close rapidly, so water hammer is less likely to occur. The durability of the system is improved.

In addition, since it is not necessary to control the supply temperature of boiler water by combining a solenoid valve, a silencer, and a thermosensor as in the conventional case, piping becomes easy.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a boiler water supply system using a temperature control device for a boiler water supply tank according to an embodiment of the present invention,
FIG. 2 is a longitudinal sectional view showing the opened state of the temperature regulating valve, FIG. 3 is a longitudinal sectional view showing the closed state of the temperature regulating valve, and FIG. 4 is an overall configuration of a conventional boiler water supply system. It is a figure. A: Boiler, E: Boiler water supply tank, F: Boiler water supply pipe, G:
Live steam introduction pipe, K: Temperature control valve, 6: Valve, 9: Thermosensitive element.

Claims (1)

[Scope of utility model registration request] 1. A boiler water supply provided with a boiler and a boiler water supply tank, a boiler water supply pipe for supplying boiler water from the boiler water supply tank to the boiler, and a live steam introduction pipe for guiding live steam from the boiler to the boiler water supply tank. In the system,
A temperature adjusting valve is provided which is connected to the end of the live steam introducing pipe at the submerged position of the boiler water supply tank and which controls the temperature of the supply water of the boiler water, and the temperature adjusting valve is a thermosensitive body that responds to the water temperature of the boiler water supply tank. And a valve for stopping the introduction of live steam into the boiler water supply tank by the operation of the heat-responsive body, and a temperature control device for the boiler water supply tank.