JPH081409Y2 - Temperature holding device for liquid temperature in tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention uses, for example, cleaning water as the liquid to be heated and steam as the heating fluid to heat up the liquid to be heated and maintain the temperature of the liquid inside the tank for maintaining the temperature. The present invention relates to a temperature holding device.

<Prior Art> As shown in FIG. 5, the conventional temperature maintaining device for the liquid temperature in the tank for cleaning water is a heating pipe B2 disposed inside the liquid tank A (at the liquid immersion position).
And a heating fluid introducing pipe C connected to the inlet side of the heating pipe B2 outside the liquid tank A, and a temperature sensor G inside the liquid tank A are provided. A temperature control valve H for opening and closing the introduction pipe C was provided.
The valve actuating portion H1 of the temperature control valve H and the temperature sensor G are connected by a lead pipe L, and the lead pipe L is filled with a heat-sensitive fluid that is heat-sensitive and changes its volume. Therefore, when the temperature of the liquid to be heated exceeds a certain temperature by the temperature sensor G, the temperature control valve H opens. Further, a jet M for jetting the heating fluid into the liquid to be heated is connected to the tip of the heating pipe B2, and noise caused by mixing the vapor of the heating fluid and the liquid to be heated is reduced in the jet M. The silencer function for is added.

 However, this conventional device has the following problems.

(A) By opening and closing the temperature control valve H, the vapor of the heating fluid, which has a temperature difference considerably from the temperature of the liquid to be heated, is directly blown into the liquid tank A, so that the desired control range of the temperature becomes large. It is difficult to obtain a stable temperature.

(B) Even if the ejecting body M has a silencer function, a large amount of noise may be generated and the liquid tank A may be vibrated.

Further, in another conventional temperature maintaining device for the liquid temperature in the bath shown in FIG. 6, the heating pipe B3 was made to meander and the temperature adjusting trap N was connected to the control pipe D outside the liquid bath A.

However, also in this conventional example, (c) the trap N, which is a heat-sensitive body, is outside the liquid tank A,
Since the liquid temperature of the liquid to be heated in the liquid tank A cannot be sensed, the set temperature is difficult.

(D) The heating tube B3 at the rising portion in the middle of the heat-sensitive tube B3 does not have a proper temperature gradient, and in extreme cases, there is a problem that abnormal heating of the liquid tank A occurs due to temperature reversal.

<Purpose> Therefore, in view of the above problems, the present invention has an extremely fast initial rise, and the temperature setting of the liquid to be heated does not easily go wrong,
It is an object of the present invention to provide a temperature maintaining device for maintaining a liquid temperature in a tank in which the liquid to be heated can be returned to a set temperature in a short time even if the liquid to be heated is significantly lowered in temperature in a short time.

<Means for Solving Problems> A means for solving problems according to the present invention is, as shown in FIGS. 1, 2, 3, and 4, a heating pipe B arranged inside a liquid tank A (a liquid immersion position),
A heating fluid introduction pipe C connected to the inlet side of the heating pipe B outside the liquid tank A, and the heating pipe B outside the liquid tank A.
A heating pipe F is composed of a control pipe D connected to the outlet side of the heating pipe and a branch pipe E branched and connected to the bottom of the heating pipe B, and a temperature sensor for detecting the liquid temperature inside the liquid tank A. G
Is provided, and a temperature control valve H is provided for opening and closing the control pipe D by the output signal of the temperature sensor G when the liquid temperature becomes slightly lower than the set temperature, and the heating pipe B has an internal thermosensitive temperature control valve. K is provided, and the temperature adjusting valve K is a valve for stopping the supply of the heating fluid to the liquid tank A by the operation of the temperature sensitive body 9 which responds to the liquid temperature of the liquid to be heated and the temperature sensitive body 9. Child 6
And the temperature-responsive body 9 closes the temperature adjusting valve K when the temperature reaches a set temperature.

<Operation> In the above problem solving means, the temperature of the liquid to be heated in the liquid tank A is low at the initial stage of aeration of the heating fluid, for example, steam to the heating conduit F, and in this state, a signal from the temperature sensor G is received. The temperature control valve H is open. Further, since the temperature difference between the liquid to be heated and the heating fluid is large, the steam as the heating fluid radiates a large amount of heat to the liquid to be heated while passing through the heating pipe B.
Since the temperature-sensitive responder 9 is contracted in a low temperature state, the valve element 6 is in a valve open state, and a large amount of steam or hot water as a heating fluid is blown into the liquid to be heated from the outlet 1b.

After that, when the liquid temperature of the liquid to be heated rises to a value slightly lower than the set value, the signal from the temperature sensor G closes the temperature control valve H, and only the temperature adjustment valve K operates. That is, the hot water or steam of the heating fluid, which is proportional to the expansion / contraction state of the temperature-responsive body 9, passes through the heating pipe B, and the outlet of the temperature adjusting valve K that adjusts the temperature of the liquid to be heated. It is blown from 1b.
Finally, the valve element 6 is closed in the heating pipe B with the condensate having a temperature slightly higher than the liquid temperature of the liquid to be heated. Then, the temperature sensitive responder 9 of the temperature adjusting valve K is the amount of heat consumed by the liquid to be heated (that is, the amount of heat corresponding to the temperature of the liquid to be heated becoming low).
Expands and contracts, the valve 6 opens and closes, and the amount of heat of the heated fluid is supplied to the heated liquid, so that the liquid temperature of the heated liquid is kept substantially constant. Further, when the liquid temperature of the liquid to be heated drops to a value lower than the set value, the temperature control valve H is opened by a signal from the temperature sensor G, and the liquid to be heated passes through the heating pipe B to become the liquid to be heated. Heat is released, the liquid temperature rises quickly, and the temperature control valve H
Is closed, and the temperature of the liquid is kept substantially constant by the action of the temperature adjusting valve K.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.
The figure shows the whole structure of the temperature holding device for the liquid temperature in the tank of the present invention, the second
The figure shows a longitudinal sectional view of the temperature control valve in an open state, Fig. 3 shows a longitudinal sectional view of the temperature control valve in a closed state, and Fig. 4 shows IV of Fig. 2.
FIG. 4 is a sectional view taken along line IV.

As shown in the figure, the device of the present invention comprises a heating pipe B arranged inside the liquid tank A (a liquid immersion position), and a heating fluid introducing pipe connected to the inlet side of the heating pipe B outside the liquid tank A. C, a control pipe D connected to the outlet side of the heating pipe B outside the liquid tank A, and a branch pipe E branched and connected to the bottom of the heating pipe B.
The heating pipeline F is composed of Then, a temperature sensor G is provided inside the liquid tank A, a temperature control valve H for opening and closing the control pipe D according to an output signal of the temperature sensor G is provided, and a steam trap J is provided at the end of the control pipe D. Is connected, and the heating pipe B is provided with an internal thermosensitive temperature control valve K. Further, the temperature adjusting valve K includes a temperature-responsive body 9 that responds to the temperature of the liquid to be heated, and a valve 6 that stops the supply of the heating fluid to the liquid tank A by the operation of the temperature-responsive body 9. The temperature sensitive body 9 is designed so that the valve element 6 is closed when the temperature of the liquid to be heated reaches a set value. L is a lead tube in which a heat-sensitive fluid is enclosed.

The temperature sensor G and the temperature control valve H are related so that the diaphragm-operated valve operating portion H1 of the temperature control valve H is closed at a temperature slightly lower than the set temperature T of the liquid tank A. . That is, the temperature sensor G is configured to issue a valve closing signal to the temperature control valve H at an operating temperature which is lower than the set temperature of the liquid tank A by ΔT. In principle, Δ
Although T may be zero, ΔT is 2 in consideration of the size and atmosphere of the liquid tank A because the temperature inside the tank is not uniform in reality.
It is desirable to set the temperature to -5 ° C.

When an electromagnetic valve is used as the temperature control valve H, the temperature sensor G is an electronic thermometer and its signal is an electric signal.

Next, the temperature control valve K will be explained mainly with reference to FIGS. 2, 3, and 4, 1 is a cylindrical housing, and a base 2 with a circular inlet 1a,
It is composed of a lid 3 with 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 having a conical portion 6b.
A plurality of radial outflow holes 4b are formed in the guide hole 4a in a uniform distribution.

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, 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 according to the operation of the temperature sensitive body 9 is provided.

Further, there is provided a sudden change thermosensitive element 11 made of a shape memory alloy that expands and forcibly moves the valve element 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 13 is stretched and fixed to the outlet 1b so as to cover it.

Next, the operation will be described. In the initial stage of aeration of the heating fluid such as steam to the heating pipeline F, the temperature of the liquid to be heated in the liquid tank A is low. In this state, the temperature control valve receives a signal from the temperature sensor G. H is open. Further, since the temperature difference between the liquid to be heated and the heating fluid is large, the steam as the heating fluid radiates a large amount of heat to the liquid to be heated while passing through the inside of the heating pipe B, and the condensate generated thereby causes the condensate generated in the heating pipe. It is discharged from steam trap J at the end of pipe F.

The steam trap 3 is not indispensable and can be replaced by a valve, an orifice, or the like, and even without it, an open pipe can sufficiently work. Further, since the temperature sensitive responder 9 of the temperature control valve K is contracted in a low temperature state, the valve element 6 is in the open state, and a large amount of steam or hot water which is a heating fluid enters the heated liquid from the outlet 1b. Is blown in.

After that, when the liquid temperature of the liquid to be heated rises to a value slightly lower than the set value, the signal from the temperature sensor G closes the temperature control valve H, and only the temperature adjustment valve K operates. That is, hot water or steam of the heating fluid proportional to the expansion / contraction state of the temperature sensitive body 9 of the temperature control valve K that responds to the liquid temperature of the liquid to be heated passes through the heating pipe B and the outlet 1b of the temperature control valve K. Is blown from.
Finally, the valve element 6 is closed in the heating pipe B with the condensate having a temperature slightly higher than the liquid temperature of the liquid to be heated. Then, the temperature sensitive responder 9 of the temperature control valve K is the amount of heat consumed by the liquid to be heated (that is, the amount of heat of the valve where the liquid to be heated has become low).
Expands and contracts, the valve 6 opens and closes, and the amount of heat of the heated fluid is supplied to the heated liquid, so that the liquid temperature of the heated liquid is kept substantially constant.

In the above description, the operation of the temperature control valve K will be described in detail. Since the liquid to be heated below the set temperature has reached the heat-sensitive chamber 8 during the heating in the initial period of ventilation, the temperature-sensitive responder 9 is placed in the heat-sensitive chamber 8. Since the temperature is low, it contracts as shown in FIG. 2 and the valve rod 6a is moved upward by the resultant force of the pressure acting on the valve element 6 from the valve hole 5 and the assisting force of the bias spring 12 in this embodiment. ,
The valve 6 is separated and a large amount of vapor of heating fluid at high temperature enters the heat-sensitive chamber 8 through the radial outflow holes 4b, and then the porous material 13 at the outlet 1b.
It is crushed into small pieces and discharged into the liquid tank.

At this time, since the bubbles of the vapor are finely crushed, the bubbles are efficiently condensed during heating, the heating efficiency of the liquid to be heated is improved, and the bubbles become finer, so that noise and vibration during condensation do not occur. Get smaller.

Then, as the liquid to be heated in the heat-sensitive chamber 8 gradually increases in temperature, the temperature-responsive body 9 gradually expands and pushes the valve rod 6a downward through the E-ring 10, so that the valve 6 is forced. And the valve hole 5 is closed.

In this way, the valve element 6 is repeatedly opened and closed, and the temperature of the fluid on the outlet 1b side is kept substantially constant by repeatedly supplying and stopping the heating fluid.

Summarizing the above, (e) According to this device, the initial start-up is much quicker than the device using only the steam trap, such as the conventional temperature maintaining device for the liquid temperature in the tank shown in FIG.

(F) Like the conventional temperature maintaining device for the liquid temperature in the tank shown in FIG. 5, the steam is directly blown into the liquid tank A only at the time of rising, and thereafter, the condensate close to the liquid temperature is adjusted by the temperature control valve. Since it is discharged from K, the temperature setting of the liquid to be heated is unlikely to go wrong.

(G) Should the temperature of the liquid to be heated drop drastically in a short time, the temperature control valve H opens and the temperature adjustment valve K
Since the higher temperature steam is ejected, the liquid to be heated can return to the set temperature in a short time.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

<Effect of Device> As is clear from the above description, according to the present invention, the following effects can be expected.

(A) Since steam is directly blown into the liquid tank at the time of start-up, the initial start-up is much higher than that of the device using only the steam trap as in the conventional temperature maintaining device for the liquid temperature in the tank shown in FIG. Get faster

(B) The steam is directly blown into the liquid tank as in the conventional temperature maintaining device for the liquid temperature in the tank shown in FIG. 5 until the liquid temperature at the time of rising reaches a temperature slightly lower than the set temperature. After that, since the supply of condensate near the liquid temperature is stopped by the temperature control valve, the temperature fluctuation near the set temperature of the liquid to be heated becomes small and the liquid temperature can be kept almost constant. The temperature setting of the heating liquid does not easily change.

(C) In the unlikely event that the temperature of the liquid to be heated drops significantly in a short time, the temperature control valve opens and hot steam is ejected from the temperature adjustment valve. Can return to the set temperature in a short time.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a temperature holding device for the liquid temperature in the tank of the present invention,
2 is a longitudinal sectional view of the temperature regulating valve in an open state, FIG. 3 is a longitudinal sectional view of the temperature regulating valve in a closed state, and FIG. 4 is a sectional view taken along line IV-IV of FIG. 2; FIG. 6 is an overall configuration diagram of a conventional temperature maintaining device for liquid temperature in a tank, and FIG. 6 is an overall configuration diagram of another temperature retaining device for liquid temperature in a conventional tank. A: Liquid tank, B: Heating pipe, C: Heating fluid introducing pipe, D: Control pipe, E: Branch pipe, F: Heating pipe, G: Temperature sensor, H: Temperature control valve, J:
Steam trap, K: Internal thermosensitive temperature control valve, 6: Valve,
9: Temperature sensitive body.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hideo Ogura Inventor Hideo Ogura 2-3-1 Tagawakita, Yodogawa-ku, Osaka City, Osaka Prefecture Miyawaki Co., Ltd. (56) Bibliography Sho 60-146253 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A heating pipe arranged inside a liquid tank, a heating fluid introducing pipe connected to an inlet side of the heating pipe outside the liquid tank, and an outlet of the heating pipe outside the liquid tank. A control pipe connected to the side and a branch pipe branched and connected to the bottom of the heating pipe are configured, and a temperature sensor for detecting the liquid temperature is provided inside the liquid tank, and the liquid temperature is A temperature control valve that opens and closes the control pipe by the output signal of the temperature sensor when the temperature is slightly lower than the set temperature is provided, and the heating pipe is provided with an internal thermosensitive temperature control valve, and the temperature control valve is
The temperature-responsive body responds to the liquid temperature of the liquid to be heated and a valve for stopping the supply of the heating fluid to the liquid tank by the operation of the temperature-responsive body, and the temperature-responsive body is set to a set temperature. A temperature holding device for the in-tank liquid temperature, characterized in that the temperature control valve is closed when the temperature becomes low.