JP2007183064A - Temperature control valve and heat exchanger provided with same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a temperature control valve which is compact and has excellent responsiveness, and a heat exchanger provided with the same. <P>SOLUTION: The temperature control valve 16 arranged in a heating system for heating a fluid C to be heated by heat of a heating fluid S for controlling a flow rate of the heating fluid S depending on a temperature of a high temperature fluid H which is the fluid to be heated after heated, is provided with a control valve part 17 for controlling the flow rate of the heating fluid S and a drive part 18 for driving the control valve part 17 depending on the temperature of the high temperature fluid H in a casing 20. The drive part 18 includes a heat sensitive element 18a positioned in a passage of the high temperature fluid H. A heat insulating passage 44 blocked from a passage of the high temperature fluid H for introducing the heating fluid S in a periphery of the heat sensitive element 18a is formed in the casing 20. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a temperature control valve used in a hot water supply device that generates a high-temperature fluid by heating a fluid to be heated with a heating fluid such as steam, and a heat exchange device including the temperature control valve.

Conventionally, a hot water supply apparatus that generates hot water by heating cold water with steam is known. This hot water supply device includes a heat exchanger that generates hot water by heating cold water with the heat of steam, and cold water that is directly connected to a water supply source without passing through a circulation tank and that leads the cold water from the water supply source to the heat exchanger. A pipe, a hot water pipe for deriving hot water generated by the heat exchanger, and a steam pipe that is connected to an external steam supply source and guides the steam from the steam supply source to the heat exchanger. Further, a temperature sensor (temperature sensing unit) that is disposed in the hot water pipe and obtains a mechanical displacement in the drive unit by heat energy given from the hot water in the hot water pipe, and is disposed in the steam pipe, the drive unit And a steam control valve that adjusts the amount of steam passing through the steam pipe in accordance with the mechanical displacement (see, for example, Patent Document 1).
JP 2000-241023 A

  In the hot water supply device, the temperature of the hot water generated by the heat exchanger is sensed by a temperature sensor, and if the temperature of the hot water is high, the supply amount of steam is reduced by the steam control valve to lower the temperature of the hot water and the temperature of the hot water can be lowered. For example, the steam supply amount is increased by the steam control valve to raise the temperature of the hot water. At this time, by arranging the temperature sensor at the outlet of the heat exchanger, the responsiveness of the temperature adjustment of the hot water can be improved, but the temperature sensor and the heat exchanger are separated from each other. Since the connection is made by a thin copper tube called a capillary tube, the structure becomes complicated and the number of parts increases. Therefore, the present applicant has previously proposed a compact steam control valve in which a drive unit having a temperature sensing element and a steam control valve are provided in one casing and no capillary tube is required (Japanese Patent Application No. 2004-301028). ). However, the steam control valve is actually installed at a position away from the heat exchanger (downstream of the hot water outlet of the heat exchanger) due to problems such as size. As a result, since the responsiveness is not sufficient, there is the following problem.

  After flowing hot water at an arbitrary flow rate, when the hot water supply valve of the hot water supply device is closed to rapidly reduce the flow rate of hot water from the heat exchanger, the temperature of the hot water in the heat exchanger rises excessively. In order to avoid this overheating of the hot water, the temperature sensing element originally detects the temperature rise of the hot water and decreases the supply amount of steam. However, since the hot water does not flow, the temperature is raised in the heat exchanger. The hot water will slowly reach the temperature sensing element by natural convection. For this reason, the temperature rise of the hot water near the temperature sensing element is slow, and it takes time to drive the steam control valve to reduce the amount of steam supplied, and excessively hot water is generated. In addition, the steam is wasted.

  Therefore, an object of the present invention is to provide a temperature control valve that is compact and excellent in responsiveness, and a heat exchange device including the temperature control valve.

  In order to achieve the above-described object, the temperature control valve according to the present invention is provided in a heating system that heats a heated fluid with the heat of the heated fluid, and the heating fluid is heated according to the temperature of the heated fluid after heating. A temperature control valve that adjusts the flow rate, and includes a control valve unit that adjusts the flow rate of the heated fluid in the casing, and a drive unit that drives the control valve unit according to the temperature of the heated fluid, The drive unit has a thermal element facing the passage of the heated fluid, and the casing is cut off from the passage of the heated fluid, and a heat retaining passage for introducing the heated fluid is formed in the vicinity of the thermal element. ing.

  According to this configuration, the control valve unit and the drive unit are housed in one casing, and the capillary tube for heat transfer is unnecessary, so the temperature control valve is compact. In addition, when the flow rate of the heated fluid such as hot water becomes zero by, for example, suddenly closing the hot water supply valve, the heated fluid introduced in the vicinity of the thermal element through the heat retaining passage is used. The heated fluid staying in the heating fluid passage is heated and the temperature rises, and the thermal element quickly senses this temperature rise. When the thermal element senses the temperature rise of the heated fluid, the drive unit drives the control valve unit, the opening degree of the control valve unit is adjusted, and the supply amount of the heated fluid from the control valve unit decreases rapidly. Thus, unlike the conventional case of heat transfer by convection, the amount of heating fluid supplied can be quickly reduced, so that the temperature of the heated fluid does not rise excessively and the heating fluid is wasted. It is not consumed.

  Preferably, the control valve portion and the drive portion are disposed on the center line of the casing, and a plurality of the heat retaining passages are disposed at equal intervals in the circumferential direction on the side portion of the casing. According to this configuration, the casing can be formed elongated in the direction of the center line by disposing the control valve portion and the drive portion on the center line of the casing, so that the heat retaining passage formed in the casing is driven by approaching the drive portion. Heat can be quickly transferred to the thermal element through the fluid to be heated around the part.

  Preferably, the casing has a first body that forms a passage for a heated fluid that is opened and closed by the control valve portion, and a second body that has one end connected to the first body and forms a passage for the fluid to be heated; A cover having a lead-out port for the heated fluid and closing the other end of the second body, and the heat retaining passage communicating with the passage of the heated fluid is formed in the second body.

  According to this configuration, the first body, the second body, and the cover are disassembled during maintenance, and the internal control valve unit and the drive unit can be easily accessed, so that maintainability is improved.

  Furthermore, the heat exchange device according to the present invention includes a plate-type heat exchanger that heats the fluid to be heated by the heat of the heating fluid, and the temperature control valve having the above-described configuration, and the heating fluid inlet of the heat exchanger has the above-described configuration. The heated fluid outlet of the casing is connected, and the heated fluid outlet of the heat exchanger is connected to the heated fluid inlet of the casing.

  According to this structure, the plate-type heat exchanger and the temperature control valve of the present invention are connected, so that a heat exchange device that is compact and excellent in responsiveness as a whole can be obtained.

  According to the temperature control valve and the heat exchange device according to the present invention, a capillary tube for heat transfer is not required, so that the structure is compact. Even when the flow rate of the heated fluid suddenly becomes zero, the heated fluid in the vicinity of the thermal element is heated by the heated fluid introduced into the heat retaining passage. As a result, the temperature of the fluid to be heated rises, and the temperature sensitive element in the passage quickly senses this temperature rise. As a result, the responsiveness is improved, thereby preventing excessive temperature rise of the fluid to be heated and waste of the heating fluid. Is done.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a system diagram of a high-temperature fluid supply system 10 such as a hot water supply system using a temperature control valve 16 according to the present invention and a heat exchange device HX having the temperature control valve 16. A high-temperature fluid supply system 10 shown in FIG. 1 is a plate heat exchanger 11 that generates a high-temperature fluid H such as hot water by heating a heated fluid C such as cold water with the heat of a heating fluid S such as steam. It has. The plate-type heat exchanger 11 is a small-sized heat exchanger in which a plurality of plates are stacked and a passage for a heating fluid and a passage for cold water C as a fluid to be heated are alternately arranged between the plates. Large capacity.

  The high-temperature fluid supply system 10 further includes a heated fluid passage 12 that guides the heated fluid C supplied from the heated fluid supply source WA to the heat exchanger 11, and the heated fluid generated by the heat exchanger 11. The high-temperature fluid passage 13 that leads out the high-temperature fluid H that is a heating fluid, the heating fluid passage 14 that guides the heating fluid S supplied from the heating fluid supply source VA to the heat exchanger 11, and the heat exchanger 11 are passed through. The flow rate of the heating fluid S introduced into the heat exchanger 11 is adjusted according to the temperature of the high temperature fluid H from the discharge passage 15 for discharging the heating fluid S such as the condensate (drain) and the heat exchanger 11 later. A temperature control valve 16 is provided. Connected to the downstream side of the high-temperature fluid passage 13 is a high-temperature fluid supply passage 19 that leads to a hot water supply valve (curan) 50 that serves as a hot-water supply outlet for the high-temperature fluid H led to the high-temperature fluid passage 13.

  The temperature control valve 16 is arranged in the heating fluid passage 14 to adjust the flow rate of the heating fluid S, and the control valve portion 17 is adjusted according to the temperature of the high temperature fluid H in the high temperature fluid passage 13. And a drive unit 18 that is driven to open and close. The control valve unit 17 and the drive unit 18 are disposed on the center line CC of the casing 20.

  Next, a specific structure of the temperature control valve 16 will be described with reference to FIG. As shown in the figure, the temperature control valve 16 is accommodated in a cylindrical casing 20. The casing 20 includes a first body 21, a second body 22 having one end connected to the first body 21, and a cover 23 that closes the other end of the second body 22. The first body 21 and the second body 22 are connected by inserting four bolts 25 through the insertion holes of the first body 21 and screwing them into the screw holes of the second body 22, and the cover 23 has four bolts. 26 is inserted into the insertion hole of the cover 23 and screwed into the screw holes 40 (FIG. 3) at the four corners of the second body 22 to be attached to the second body 22. Sealing members 41 to 43 are attached to the joint portions of the first body 21, the second body 22, and the cover 23 to ensure airtightness and watertightness.

  A part of the heating fluid passage 14 that is opened and closed by the regulating valve portion 17 is formed inside the first body 21, the inlet 28 of the heating fluid S opens at one end surface, and the outlet 29 opens at the lower surface. is doing. A part of the high-temperature fluid passage 13 is formed inside the second body 22, the introduction port 33 for the high-temperature fluid H is opened on the lower surface, and the outlet port 34 is opened on the other end surface. As shown in FIG. 1, the heating fluid inlet 30 of the heat exchanger 11 is connected to the heating fluid outlet 29 of the temperature control valve 16, and the heated fluid outlet 32 of the heat exchanger 11 is connected to the heated fluid inlet 33. It is connected.

  An annular groove 23 a is formed on the entire inner surface of the cover 23 in FIG. 2 and communicates with the other end of the heat retaining passage 44.

  The control valve unit 17 and the drive unit 18 are configured as one unit U. The unit U includes a body 36 having a hexagonal cross section on the outer periphery of the main portion 36a, a valve seat block 37 screwed to one end thereof, and a stepped cylindrical other end 36b of the body 36 And a connected cap 38. The valve seat block 37 is formed with an introduction hole 37 a constituting a part of the heating fluid passage 14 for introducing the heating fluid S into the body 36. A total of six through holes 39 are formed in each of the six outer walls of the body 36, and the heating fluid passage 14 a radially inward of the body 36 and the heating fluid passage 14 b radially outward are communicated with each other. ing.

  The adjusting valve portion 17 is formed with a valve body 17b at the tip of a cylinder 17a, and a piston 17c is fitted into a hollow portion of the cylinder 17a. The first spring 17d moves rightward in FIG. 2 (on the drive portion 18 side). An elastic force is applied, and the position is restricted by being pressed against a stopper 17e mounted on the cylinder 17a. The cylinder 17a is inserted into the hollow portion of the body 36, and a second spring 17f that presses the cylinder 17a to the right is mounted between the cylinder 17a and the valve seat block 37. The driving unit 18 has a temperature sensing element 18a having a thermal expansion body such as a thermo wax that converts temperature into mechanical displacement at the tip of the heated fluid outlet 34 side. The temperature element 18 a is attached to the body 36 via the cap 38. A cylindrical rod 18c that is displaced by thermal expansion and thermal contraction of the thermal expansion body in the thermosensitive element 18a is fitted to the cylindrical guide portion 18b of the drive unit 18 so as to be able to advance and retract. The tip of this rod 18 c is connected to the piston 17 c of the control valve portion 17. As the temperature sensitive element 18a, other elements such as bimetal can be used in addition to the thermo wax.

  In the unit U, the right end portion is screwed into the mounting screw portion 46 of the second body 22, and one end portion of the left valve seat block 37 is fitted into the mounting hole 47 of the first body 21 to enter the casing 20. It is supported.

  A plurality of heat retaining passages 44 extend in parallel to the center line CC on the outer periphery of the second body 22 of the casing 20 and pass through the second body 22. One end of the heated fluid is outside the unit U in the first body 21. The other end portion communicates with the passage 14 b and is closed by the cover 23. As shown in FIG. 3, a plurality (four shown) of the heat retaining passages 44 are arranged at equal intervals in the circumferential direction on the same axis as the center line CC of the casing 20. An annular groove 23 a is formed over the entire inner surface of the cover 23 shown in FIG. 2 and communicates with the other end of the heat retaining passage 44. Thus, the heat retaining passage 44 is cut off from the heated fluid passage 13 so that the heated fluid S in the heat retaining passage 44 is not mixed into the high temperature fluid H flowing through the heated fluid passage 13.

  Next, the operation of the high-temperature fluid supply system having the above configuration will be described. First, when a manual valve on the side of the heating fluid S (not shown) in FIG. 1 is opened when a normal high-temperature fluid is used, the heating fluid S from the heating fluid supply source VA is heated via the heating fluid passage 14 via the temperature control valve 16. It is introduced into the exchanger 11. Similarly, when a manual valve on the heated fluid C side (not shown) is opened, the heated fluid C is introduced into the heat exchanger 11 via the heated fluid passage 12 by the internal pressure of the heated fluid supply source WA. . In the heat exchanger 11, the heated fluid S and the heated fluid C are heat-exchanged, and the heated high-temperature fluid H is guided to the drive unit 18 of the temperature control valve 16 through the high-temperature fluid passage 13. It is led out to the high temperature fluid supply passage 19. The high temperature fluid H can be taken out by opening the currant 50.

  In the temperature control valve 16 shown in FIG. 2, the temperature of the high-temperature fluid H is always detected by the thermal element 18a and converted into mechanical displacement. When the temperature of the high-temperature fluid H rises, the rod 18c advances to the left due to the expansion of the thermal element 18a, and moves the piston 17c to the left against the spring force of the first spring 17d and the second spring 17f. As a result, the valve body 17b approaches the valve seat 37b formed in the valve seat block 37, and the valve opening is reduced and reduced. By reducing the opening of the valve, the flow rate of the heating fluid S decreases, the amount of heat exchange in the heat exchanger 11 decreases, and the temperature of the high-temperature fluid H derived from the heat exchanger 11 decreases. Let

  Further, when the temperature of the high-temperature fluid H decreases, the moving force of the piston 17c by the rod 18c decreases, and the pressure of the heating fluid S in the heating fluid passage 14 and the spring force of the first spring 17d and the second spring 17f The body 17b moves backward to increase the valve opening. Thereby, the flow rate of the heating fluid S supplied to the heat exchanger 11 through the heating fluid passage 14 of FIG. 1 increases, and the temperature of the high temperature fluid H rises.

  When the normal use is suddenly stopped, that is, when the currant 50 is suddenly closed, the flow of the high-temperature fluid H in the high-temperature fluid passage 13 is suddenly stopped. At this time, the high temperature fluid H staying in the vicinity of the thermal element 18a is heated by the heating fluid S entering the heat retaining passage 44 provided in the casing 20 of FIG. Unlike the conventional heat transfer by convection, the heat sensitive element 18a senses the temperature rise of the high temperature fluid H with high responsiveness by heating the high temperature fluid H quickly. Subsequently, due to the expansion of the thermal element 18a, the rod 18c moves to the left and advances the piston 17c to the left. Thereby, the valve body 17b advances and approaches the valve seat 37b, and the valve opening degree is throttled. By restricting the valve opening, the flow rate of the heating fluid S decreases, and an excessive temperature rise of the high-temperature fluid H in the vicinity of the thermal element 18a can be quickly suppressed.

Here, since the control valve part 17 and the drive part 18 are arrange | positioned on the centerline CC of the casing 20, since the casing 20 can be elongated in the direction of the centerline CC, the heat insulation passage 44 formed in the casing 20 is driven. By approaching the part 18, heat can be quickly transferred to the thermal element 18 a via the high-temperature fluid H around the drive part 18.

  Moreover, since the high temperature fluid H in the temperature control valve 16 can be heated by guiding a small amount of the heating fluid S to the heat retaining passage 44, waste of the heating fluid S is suppressed.

  Furthermore, since the control valve unit 17 and the drive unit 18 are accommodated in one casing 20 and a capillary tube for heat transfer is not required, the temperature control valve 16 becomes compact.

  Further, the casing 20 has a first body 21 that forms a passage for the heated fluid S that is opened and closed by the control valve portion 17, and a second body that has one end connected to the first body 21 and forms a passage for the high-temperature fluid H. The heat retaining passage 44 having a body 22 and a cover that has an outlet for the high-temperature fluid H and closes the other end of the second body 22, and communicates with the passage of the heated fluid S in the second body 22. Since the first body 21, the second body 22, and the cover 23 are disassembled during maintenance, the internal control valve portion 17 and the drive portion 18 can be easily accessed. Excel

  As the heating fluid S, hot water, hot gas, and the like can be used in addition to steam. In addition, if the liquid C, such as various soups, is used as the heated fluid C other than cold water, the soup is not overheated after the supply is stopped, so that it is warm enough to eat when the supply is resumed. Soup can be easily obtained, and it can be used in vending machines.

1 is a system diagram of a high-temperature fluid supply system using a temperature control valve according to the present invention and a heat exchange device equipped with the same. It is a longitudinal cross-sectional view of the temperature control valve which concerns on this invention. It is an AA arrow directional view of FIG.

Explanation of symbols

11 Heat exchanger (plate type heat exchanger)
DESCRIPTION OF SYMBOLS 12 Heated fluid channel | path 13 High temperature fluid channel | path 14 Heated fluid channel | path 16 Temperature control valve 17 Control valve part 18 Drive part 18a Thermal element 20 Casing 44 Thermal insulation path C Heated fluid H High temperature fluid (heated fluid after a heating)
S Heating fluid HX Heat exchange device

Claims (4)

A temperature control valve that is provided in a heating system that heats a heated fluid with the heat of the heated fluid and adjusts the flow rate of the heated fluid according to the temperature of the heated fluid after heating,
In the casing, provided with an adjustment valve portion for adjusting the flow rate of the heated fluid, and a drive portion for driving the adjustment valve portion according to the temperature of the heated fluid,
The drive unit has a thermal element facing the passage of the heated fluid,
A temperature control valve, wherein the casing is cut off from the passage of the fluid to be heated, and a heat insulation passage for introducing the heating fluid is formed in the vicinity of the thermal element.   2. The temperature control valve according to claim 1, wherein the control valve portion and the drive portion are disposed on a center line of the casing, and a plurality of the heat retaining passages are disposed at equal intervals in a circumferential direction on a side portion of the casing.   3. The first casing according to claim 1, wherein the casing forms a passage for a heated fluid that is opened and closed by the regulating valve portion, and a first body that is connected to the first body to form a passage for the fluid to be heated. 2 body and a cover that has a lead-out port for the heated fluid and closes the other end of the second body, and the heat retaining passage communicating with the passage of the heated fluid is formed in the second body. Temperature control valve.   It has a plate type heat exchanger which heats a fluid to be heated with the heat of heating fluid, and a temperature control valve according to any one of claims 1 to 3, and a heating fluid inlet of said heat exchanger is said casing The heat exchange device is connected to the heated fluid outlet of the heat exchanger, and the heated fluid outlet of the heat exchanger is connected to the heated fluid inlet of the casing.

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