JP2008111597A - Heating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating system capable of constantly and stably producing hot water of a prescribed temperature with a simple and inexpensive constitution, and effectively preventing hot water of abnormally high temperature from being supplied. <P>SOLUTION: This heating system comprises a heat exchanger 11 producing the hot water M by heat exchange between heating fluid S and cold water C, a pressure valve 20 disposed in a cold water passage 12 and opened when a pressure at an upstream side becomes higher than a pressure at a downstream side by more than a prescribed value, and an adjustment valve 17 disposed in a heating fluid passage 13 and adjusting supply of the heating fluid S to the heat exchanger 11. The adjustment valve 17 has a driving portion 27 comprising an upstream-side lead-in chamber 38 in which the cold water C at the upstream side of the pressure valve 20 is led, and a downstream-side lead-in chamber 39 partitioned from the upstream-side lead-in chamber 38 by a diaphragm 30 and communicated with the upstream-side lead-in chamber 38 through an orifice 16. A temperature control valve 45 is disposed in a hot water lead-out passage 14 and closed when a temperature of hot water is higher than the prescribed value, to stop the inflow of cold water C from the downstream-side lead-in chamber 39 into the hot water lead-out passage 14. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heating system that generates hot water by heating cold water with a heating fluid such as steam.

  2. Description of the Related Art Conventionally, a hot water supply apparatus that is a type of heating system that generates hot water by heating cold water with steam is known (see Patent Document 1). As shown in FIG. 5, the heating system in this hot water supply apparatus generates hot water M by heating cold water C with heat from a heating fluid S such as steam by a heat exchanger 60, and is supplied from a water supply source WA. The cold water C is led to the heat exchanger 60 by a cold water pipe 61, the heating fluid S from the heating fluid supply source VA is led to the heat exchanger 60 by a heating fluid pipe 62, and the cold water C and the heating fluid are heated by the heat exchanger 60. Hot water M generated by heat exchange with S is led out from the hot water pipe 63. The heating fluid pipe 62 is provided with a regulating valve 64 for adjusting the passing amount of the heating fluid S flowing inside, and the hot water pipe 63 is provided with a temperature sensor 65 in the vicinity of the outlet side of the heat exchanger 60. ing.

  In the hot water supply device, hot water M is generated by heat exchange between the cold water C from the water supply source WA and the heating fluid S from the heating fluid supply source VA in the heat exchanger 60, and this hot water M is opened by the curan 66. It is taken out by the valve. The heated fluid S after the heat exchange that has passed through the heat exchanger 60 is discharged to the outside from the discharge passage 67 as condensate (drain). In this hot water supply apparatus, the temperature of the hot water M generated by the heat exchanger 60 is detected by the temperature sensor 65, and the temperature information of the detected hot water M is fed back to the control valve 64 by the feedback circuit 68. If the temperature is high, the supply amount of the heating fluid S to the heat exchanger 60 is decreased by restricting the adjustment valve 64. Conversely, if the temperature of the hot water M is low, the supply amount of the heating fluid S is reduced by opening the adjustment valve 64. The hot water M having a predetermined temperature is taken out by increasing the temperature.

JP 2006-127719 A

  However, the hot water supply apparatus requires a complicated mechanism that senses the temperature of the hot water M and feedback-controls the control valve 64 based on the sensed temperature. The temperature of the hot water M is likely to change unexpectedly due to a delay in sensing the temperature of the hot water M or a change in the temperature of the hot water M relative to a change in the supply amount of the heating fluid S. Difficult to generate. Further, even when the curan 66 is closed, that is, when the hot water M is not used, the temperature of the hot water M generated by the heat exchanger 60 is always sensed by the temperature sensor 65, so this temperature information. Therefore, the feedback circuit 68 feedback-controls the control valve 64 to control the supply amount of the heating fluid S to the heat exchanger 60 so as to keep the temperature of the hot water M at a predetermined value. However, when the temperature of the hot water M decreases due to heat radiation in the hot water pipe 63, the heating fluid S is supplied to the heat exchanger 60 and is wasted.

  The present invention has been made in view of the above-described conventional problems, and can always generate hot water at a predetermined temperature stably while having a simple and inexpensive configuration, and the heating fluid can be consumed wastefully. Furthermore, it is an object of the present invention to provide a heating system that can effectively prevent the hot water from being taken out when abnormally high temperature hot water is generated.

  In order to achieve the above object, a heating system according to the present invention includes a heat exchanger that generates hot water by heat exchange between a heating fluid and cold water, and the heating fluid from a heating fluid supply source. A heating fluid passage that leads to the heat exchanger, a cold water passage that leads the cold water from the water supply source to the heat exchanger, and the cold water passage, when the upstream pressure becomes greater than the downstream pressure by a predetermined value or more. A pressure valve that opens, a control valve that is provided in the heating fluid passage and adjusts a supply amount of the heating fluid to the heat exchanger, and a hot water outlet passage that draws hot water from the heat exchanger. . In the control valve, the drive unit that drives the valve body unit that opens and closes the heating fluid passage includes an upstream introduction chamber into which cold water on the upstream side of the pressure valve is introduced via the upstream introduction passage, and a diaphragm. A downstream introduction chamber partitioned from the upstream introduction chamber, an orifice for communicating the upstream introduction chamber with the downstream introduction chamber, and a valve drive member for driving the valve body portion by deformation of the diaphragm ing. Further, the hot water outlet passage has a cold water inflow chamber connected to the downstream side introduction chamber, and is closed when the hot water temperature is equal to or higher than a predetermined value, so that the cold water from the downstream side introduction chamber becomes the cold water inflow chamber. There is provided a temperature control valve for stopping the flow of water through the hot water outlet passage. Here, the predetermined value of hot water includes not only hot water of about 40 ° C. to 60 ° C. but also hot water of over 60 ° C.

  According to this configuration, for example, when the hot water is not used by closing the curan, the cold water is not flowing in the cold water passage, and the upstream introduction chamber and the downstream introduction chamber provided in the drive portion of the control valve , That is, no differential pressure is generated between the upstream side and the downstream side of the orifice. In this case, since the regulating valve that adjusts the supply amount of the heating fluid to the heat exchanger according to the differential pressure between the upstream side and the downstream side of the orifice is closed, the heating fluid is supplied to the heat exchanger by the regulating valve. Since it is not supplied, the heated fluid is not wasted. On the other hand, when hot water is used with the curan open, the cold water in the cold water passage flows from the upstream introduction chamber through the orifice to the downstream introduction chamber, and therefore, between the upstream side and the downstream side of the orifice. A differential pressure of cold water is generated. Therefore, the control valve is opened by the deformation of the diaphragm according to the differential pressure, and the heating fluid is supplied to the heat exchanger through the control valve. At this time, the opening degree of the control valve is adjusted according to the magnitude of the differential pressure. When the flow rate of the hot water, that is, the flow rate of cold water increases and the pressure difference between the upstream side and the downstream side of the pressure valve becomes larger than a predetermined value, the pressure valve is opened, and a large flow rate of cold water is ensured. Thus, the heating fluid is not consumed when the hot water is not used, the heating fluid is consumed only when the hot water is used, and the supply amount of the heating fluid is controlled according to the differential pressure. Therefore, the heating fluid is used efficiently. In addition, since the temperature of the hot water is detected and the control valve is not feedback controlled, there is no delay in temperature detection, and hot water at a predetermined temperature is always obtained stably. In addition, the conventional system has a simple and inexpensive configuration as compared with the case where a complicated mechanism for feedback-controlling the control valve based on the temperature of hot water is provided, and as a result, cost reduction can be achieved.

  For example, when the curan is opened and hot water is started to be used, the control valve is opened by the differential pressure generated by the flow of cold water through the orifice, and the heating fluid is supplied to the heat exchanger to heat the cold water. When the amount of hot water used increases, the pressure valve opens when the pressure on the upstream side of the pressure valve becomes greater than the pressure on the downstream side as the pressure on the downstream side of the pressure valve in the cold water passage decreases. Since the cold water passing through the pressure valve is supplied to the heat exchanger, a sufficient flow rate of cold water, that is, a sufficient flow rate of hot water is ensured. Further, for example, when the hot water temperature becomes an abnormally high temperature equal to or higher than a predetermined value, this is detected, the temperature control valve is closed, and the cold water from the downstream introduction chamber passes through the cold water inflow chamber. Since the flow into the outlet passage is stopped, the cold water does not pass through the orifice, the differential pressure between the upstream and downstream sides of the orifice disappears, the control valve closes, and the supply of the heated fluid to the heat exchanger stops To do. Thereby, since the temperature of the hot water led out from the heat exchanger is lowered, it is possible to effectively prevent hot water having a temperature higher than a predetermined value from being taken out.

  In the present invention, for example, the temperature control valve further includes a hot water inflow chamber connected to the hot water outlet passage, a partition wall that partitions the cold water inflow chamber and the hot water inflow chamber, and a valve provided on the partition wall It is preferable to include a valve body that opens and closes a mouth and a temperature-sensitive drive body that drives the valve body based on the temperature of hot water in the warm water inflow chamber. According to this configuration, the temperature control valve has a simple structure.

  In the present invention, the orifice may be provided in a casing of the diaphragm or a regulating valve that supports the diaphragm.

  In the present invention, it is preferable that a hot and cold water mixing valve for mixing hot water and cold water is provided on the downstream side of the temperature control valve in the hot water outlet passage. According to this configuration, when the hot water temperature suddenly becomes a predetermined value or more, even if there is a valve closing delay due to the temperature sensing delay of the temperature control valve, the hot water mixing valve mixes the cold water, Since the temperature is lowered, there is no possibility that hot water having a temperature higher than the predetermined value is taken out as it is.

  According to the heating system of the present invention, when hot water is not used, cold water does not flow through the cold water passage, so that no differential pressure is generated between the upstream side and the downstream side of the orifice, so that the control valve is closed. Therefore, since the heating fluid is not supplied to the heat exchanger, the heating fluid is not wasted. On the other hand, when hot water is used, since cold water passes through the orifice, the control valve is opened by the differential pressure generated between the upstream side and the downstream side of the orifice, and the heating fluid is supplied to the heat exchanger. . At this time, since the opening of the control valve is adjusted by the differential pressure and the supply amount of the heated fluid is controlled, there is no delay in temperature detection, and hot water having a stable temperature is always obtained. When a large amount of hot water is used, the pressure valve opens, so that a large flow rate is secured through this pressure valve. In addition, when the hot water temperature becomes abnormally high above a predetermined value, the temperature control valve closes and the cold water from the downstream introduction chamber stops flowing into the hot water outlet passage through the cold water inflow chamber. As a result, the cold water stops flowing through the orifice, the control valve is closed, and the supply of the heating fluid to the heat exchanger is stopped, so the temperature of the hot water led out from the heat exchanger decreases, Unusually hot water can be prevented from being taken out.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a system diagram showing a heating system 10 according to an embodiment of the present invention. The heating system 10 includes a heat exchanger 11 that generates hot water M by heating cold water C that is a fluid to be heated with heat of a heating fluid S such as steam. Since the hot water M led out from the heat exchanger 11 is higher in temperature than hot water M1 from the hot water mixing valve 23 described later, it will be referred to as “hot water” below. As the heat exchanger 11, for example, a plate-type heat exchanger in which a plurality of plates are stacked and a passage of a heating fluid S and a passage of cold water C (not shown) are alternately arranged between the plates via the plates. It is preferable because of its small size and large heat exchange capacity.

  In addition, the heating system 10 includes a cold water passage 12 that guides cold water C supplied from an external water supply source WA to the heat exchanger 11, and a heating fluid S such as steam supplied from a heating fluid supply source VA. The heated fluid passage 13 that leads to the heat exchanger 11, the hot water outlet passage 14 that leads out the hot water M generated in the heat exchanger 11, and the heated fluid S that has passed through the heat exchanger 11 is condensed ( And a condensate discharge passage 15 for discharging as drain).

  The cold water passage 12 is provided with a pressure valve 20 that opens when the upstream pressure becomes larger than the downstream pressure by a predetermined value or more. As shown in FIG. 2, the specific configuration of the pressure valve 20 extends into the cold water pipe 50 constituting the cold water passage 12 in a direction orthogonal to the flow direction of the cold water C, so that the cold water passage 12 extends upstream and downstream. A partition wall 51 is provided on the side, and a valve port 22 of the pressure valve 20 is formed in the partition wall 51. In the pressure valve 20, a valve body 20 a that opens and closes the valve port 22 is pressed against the valve port 22 by the spring force of the compression coil spring 40. The compression coil spring 40 is interposed between the valve body 20 a and the spring receiving member 36, and the adjustment screw 41 abutting on the spring receiving member 36 is advanced and retracted toward the partition wall 51, whereby the compression coil spring 40 is springed. By changing the force, the valve opening pressure, that is, the pressure difference between the upstream side and the downstream side of the partition wall 51 when the valve body portion 20a opens the valve port 22 can be adjusted to a predetermined value.

  The cold water pipe 50 is branched from an upstream introduction pipe 52 that forms the upstream introduction passage 18 from a location near the upstream side with respect to the partition wall 51. The tip of the upstream introduction pipe 52 is illustrated in FIG. 1 control valve 17. The adjusting valve 17 is disposed in the heating fluid passage 13 and is adjusted to an opening degree according to a differential pressure generated between an upstream side and a downstream side of an orifice 16 described later to the heat exchanger 11. The supply amount of the heating fluid S is adjusted. Next, a specific structure of the control valve 17 will be described with reference to FIG.

  FIG. 3 shows a closed state of the regulating valve 17. The regulating valve 17 is a valve rod 26 which is a valve driving member arranged in a vertical direction in a casing 25 in which the heated fluid passage 13 is formed in the upper part. Is supported at one end (lower end) of the valve stem 26, and a driving fluid 27 is provided at the other end (upper end) of the valve stem 26. A valve body 28 composed of a ball valve that opens and closes the passage 13 is disposed. The valve body portion 28 is pressed against the upper end of the valve stem 26 or the valve seat 25 a by receiving the spring force of the compression coil spring 29 interposed between the valve body portion 28 and the casing 25. The valve rod 26 is pressed against the valve seat 25a, the control valve 17 is closed, and the heating fluid passage 13 is closed.

  The drive unit 27 includes a disc-shaped receiving member 26a provided at the lower end of the valve rod 26, a diaphragm 30 fixed to the receiving member 26a in a superposed state and having a peripheral edge fixed to the casing 25, and A downstream side introduction chamber 39 and an upstream side introduction chamber 38 that are partitioned vertically by a diaphragm 30, and an orifice 16 that connects the upstream side introduction chamber 38 and the downstream side introduction chamber 39 to each other. 38, the valve body 26 is driven in the axial direction by receiving the differential pressure between the valve 38 and the downstream introduction chamber 39, that is, the differential pressure between the upstream pressure and the downstream pressure of the orifice 16. The valve opening is adjusted by moving to. Cold water C on the upstream side of the pressure valve 20 is introduced into the upstream introduction chamber 38 through the upstream introduction passage 18, and the downstream introduction chamber 39 forms a downstream lead that forms the downstream lead passage 19 in FIG. 1. Cold water C is led out toward the cold water inflow chamber 46 of the temperature control valve 45 through the pipe 53.

  The orifice 16 is formed by a small-diameter through hole formed in the axial direction at the center of a screw member 43 that passes through the insertion hole of the diaphragm 30 and is screwed into the screw hole of the receiving member 26a. A bush 44 is disposed on the outer periphery of the screw member 43 to prevent the diaphragm 30 from being crushed by fastening the screw member 43. In this embodiment, the orifice 16 is a small hole that penetrates the screw member 43 in the axial direction. However, as shown by a two-dot chain line, the upstream introduction chamber 38 and the downstream introduction chamber 39 are connected to the casing 25. You may make it provide the small hole formed so that it might connect.

  An O-ring 42 is attached to the sliding surface portion between the valve stem 26 and the casing 25 to ensure air tightness and liquid tightness. As a result, the upstream side introduction chamber 38 in FIG. Therefore, it is considered that the cold water C introduced into the downstream introduction chamber 39 does not enter the heating fluid passage 13. As clearly shown in FIG. 1, in this embodiment, the case where the valve stem 26 and the valve body portion 28 are separated is illustrated, but the valve stem 26 and the valve body portion 28 are integrally formed. It may be formed.

  The heating system 10 includes a bypass path 21 through which the cold water C flows, bypassing the pressure valve 20 and the heat exchanger 11, and the bypass path 21 forms an upstream introduction pipe that forms the upstream introduction path 18. 52, an upstream introduction chamber 38, an orifice 16, a downstream introduction chamber 39, and a downstream outlet pipe 53 that forms a downstream outlet passage 19. Therefore, when the pressure on the upstream side of the orifice 16 becomes larger than the pressure on the downstream side due to the flow of the cold water C through the bypass passage 21, the regulating valve 17 has a differential pressure between the upstream side and the downstream side. Accordingly, as the diaphragm 30 is deformed upward, the valve rod 26 is driven upward in the axial direction, and the valve body 28 is opened.

  Further, a temperature control valve 45 is provided in the vicinity of the heat exchanger 11 in the hot water outlet passage 14. The temperature control valve 45 has a hot water inflow chamber 55 defined by the cold water inflow chamber 46 and the partition wall 48, and the hot water inflow chamber 55 is connected to the hot water outlet passage 14. A valve wall 47 is formed through the partition wall 48, and the temperature of the hot water M led out from the heat exchanger 11 and the valve body 57 that opens and closes the valve port 47 are set in the hot water inflow chamber 55. A temperature-sensitive driving body 58 that detects and operates and expands to drive the normally open valve body 57 and close the valve port 47 when the temperature of the hot water M rises to a predetermined temperature, for example, 90 ° C. or more; Is provided. As the temperature-sensitive driver 58, a known bimetal type or thermo wax type temperature sensor incorporated can be used. Further, the temperature control valve 45 includes a manual adjustment member 59 that adjusts the valve closing temperature (the predetermined temperature) by the temperature-sensitive driver 58. Therefore, the temperature control valve 45 keeps the valve open state at a steady time when the temperature of the hot water M is less than 90 ° C., and flows the cold water C flowing into the cold water inflow chamber 46 through the downstream outlet pipe 53 of the bypass path 21. Then, it is introduced into the hot water inflow chamber 55 from the valve port 47 and mixed with the hot water M flowing through the hot water outlet passage 14. The chilled water C flowing into the chilled water inflow chamber 46 is a small amount and does not affect the temperature of the hot water M <b> 1 taken out from the hot water supply port valve (curran) 24.

  Further, a hot water mixing valve 23 is provided at a location between the temperature control valve 45 and the hot water outlet valve 24 serving as a hot water outlet in the hot water outlet passage 14, and the hot water mixing valve 23 is connected to the heat exchanger 11 from the heat exchanger 11. The hot water M is mixed with the cold water C from the water supply source WA, and the hot water M1 to be taken out is adjusted to a desired temperature.

  Further, check valves 31 and 32 are provided at locations upstream of the connection point of the upstream side introduction passage 18 in the cold water passage 12 and the cold water bypass passage 37 that branches from the cold water passage 12 to the hot water mixing valve 23, respectively. It is arranged. The condensate discharge passage 15 is provided with a steam trap 33 that traps the steam that is the heating fluid S and discharges only the condensate. In the cold water discharge passage 34 branched from the location between the pressure valve 20 and the heat exchanger 11 in the cold water passage 12, the heat in the heat exchanger 11 is removed when the extraction of the hot water M1 from the hot water supply valve 24 is stopped. A relief valve 35 is provided to prevent the pressure of the water M from rising too much.

  Next, the operation of the heating system 10 will be described. Since the cold water C does not flow in the cold water passage 12 and the bypass passage 21 when the hot water M1 in which the hot water supply valve 24 in FIG. 1 is closed is not used, the upstream introduction chamber 38 and the bypass passage 21 sandwich the orifice 16. The differential pressure in the downstream introduction chamber 39 becomes zero. Therefore, as shown in FIG. 3, in the adjusting valve 17, the valve body portion 28 is pressed against the valve seat 25 a by the spring force of the compression coil spring 29 and held in the closed state, and the heating fluid passage 13 is closed and heated. Supply of the fluid S to the heat exchanger 11 shown in FIG. 1 is stopped. That is, in this heating system 10, the stoppage of the flow of the cold water C in the cold water passage 12 due to the closing of the hot water supply valve 24 is mechanically detected based on the fact that the differential pressure between the upstream side and the downstream side of the orifice 16 becomes zero. Then, the control valve 17 is held in the closed state. Therefore, unlike the case where the control valve is always feedback controlled based on the temperature information of the hot water sensed by the temperature sensor as in the conventional heating system, unless the hot water supply valve 24 is opened, that is, unless the hot water M1 is used, Since the heating fluid S is not supplied to the heat exchanger 60, wasteful consumption of the heating fluid S can be prevented.

  When the hot water supply valve 24 is opened, the cold water C from the water supply source WA branches from the cold water passage 12 and flows into the bypass passage 21 reaching the cold water inflow chamber 46 of the temperature control valve 45. When the cold water C passes through the orifice 16 of the bypass passage 21, the pressure in the downstream introduction chamber 39 is lower than the pressure in the upstream introduction chamber 38 with respect to the orifice 16 due to the venturi effect. Due to the differential pressure generated between the two introduction chambers 38 and 39, as shown in FIG. 4, the diaphragm 30 is deformed upward to push up the receiving member 26a. Accordingly, the valve stem 26 as a valve driving member is pivoted. Move upward in the direction. As a result, the valve body 28 is driven upward against the spring force of the compression coil spring 29, the regulating valve 17 is opened, and the heating fluid S is supplied to the heat exchanger 11 through the heating fluid passage 13. The

  Thus, the heating fluid S is supplied to the heat exchanger 11, and the hot water M generated in the heat exchanger 11 passes through the normally open temperature control valve 45 and the hot water mixing valve 23 from the hot water supply valve 24 to the hot water M1. Accordingly, the pressure on the downstream side of the partition wall 51 in the cold water passage 12 decreases accordingly, so that the differential pressure between the pressure on the upstream side of the partition wall 51 and the pressure on the downstream side increases. When the differential pressure becomes equal to or greater than a predetermined value (pressure) that balances the spring force of the compression coil spring 40 of the pressure valve 20, a large amount of cold water that has opened the pressure valve 20 and has passed through the large-diameter valve port 22. C is supplied to the heat exchanger 11. At this time, a large pressure on the upstream side of the pressure valve 20 acts on the upstream introduction chamber 38, the control valve 17 is adjusted to a large opening, and the supply amount of the heating fluid S increases. The cold water C is heated by the heating fluid WS in the heat exchanger 11 to generate hot water M.

  After that, the flow rate of the cold water C flowing through the bypass path 21 increases and decreases in response to the increase and decrease in the flow rate of the cold water C that passes through the valve port 22 of the pressure valve 20 and is supplied to the heat exchanger 11. As a result, the differential pressure between the upstream side introduction chamber 38 and the downstream side introduction chamber 39 changes, and the opening degree of the control valve 17 is adjusted. That is, the opening degree of the control valve 17 is adjusted according to the differential pressure between the upstream side and the downstream side of the orifice 16 so that the supply amount of the heating fluid S to the heat exchanger 11 corresponds to the supply amount of the cold water C. Adjusted. It is generated by heat exchange between the heating fluid S guided to the heat exchanger 11 through the heating fluid passage 13 and the cold water C guided to the heat exchanger 11 through the pressure valve 20, and further the hot water mixing valve 23. The hot water M <b> 1 whose temperature has been adjusted is taken out from the hot water supply valve 24.

  As described above, in the heating system 10, when using hot water, the control valve 17 is opened and closed with good responsiveness by the differential pressure generated between the upstream side and the downstream side of the orifice 16 provided in the control valve 17, and the pressure valve 20 is opened so that a large amount of cold water C is supplied to the heat exchanger 11. Therefore, there is a contradiction between improving the responsiveness of temperature adjustment of the hot water M by the control valve 17 and securing a large amount of hot water M. It solves two issues at the same time.

  The heating system 10 of this embodiment is different from the complicated mechanism that feedback-controls the control valve based on the sensed hot water temperature as in the conventional heating system, and the difference generated between the upstream side and the downstream side of the orifice 16. Since the amount of heating fluid S supplied to the heat exchanger 11 is adjusted by changing the opening of the control valve 17 in accordance with the pressure, the cost can be reduced. In addition, since there is no unexpected temperature change of hot water due to a delay in sensing the temperature of the hot water by the temperature sensor in the conventional heating system or a delay in the temperature change of the hot water relative to the change in the supply amount of the heated fluid, the hot and cold mixing valve 23 Through the process, the hot water M1 having a predetermined temperature can always be stably generated.

  Further, in this heating system 10, the diaphragm 30, which is generally made of a material having low heat resistance such as rubber, is cooled by the cold water C flowing through the bypass path 21, so that the heat of the diaphragm 30 due to heat transfer from the heating fluid S Deterioration is prevented, the valve operation of the control valve 17 is stabilized, and the life of the diaphragm 30 is extended.

  Further, the heating system 10 controls the opening degree of the control valve 17 in accordance with the differential pressure between the upstream side and the downstream side of the orifice 16 as described above in a steady state where the temperature of the hot water M is 90 ° C. or less. The amount of the heated fluid S supplied to the heat exchanger 11 is adjusted, for example, when the temperature of the hot water M becomes an abnormally high temperature of a predetermined value (for example, 90 ° C.) or more in the summer, etc. When the temperature-sensitive drive body 58 of the control valve 45 presses the valve body 57 against the valve port 47, the temperature control valve 45 shifts from the normally open state to the valve closed state, and the cold water C flows through the bypass path 21. From flowing into the hot water outlet passage 14 from the cold water inlet chamber 46. As a result, the cold water C does not pass through the orifice 16 and there is no differential pressure between the upstream side and the downstream side of the orifice 16, so the control valve 17 is closed and the supply of the heating fluid S to the heat exchanger 11 is stopped. As a result, the temperature of the hot water M from the heat exchanger 11 decreases. Therefore, it is possible to prevent the temperature adjustment by the cold water mixing at the hot water mixing valve 23 provided downstream of the temperature control valve 45 from becoming difficult.

  The temperature control valve 45 includes a hot water inflow chamber 55 connected to the hot water outlet passage 14, a partition wall 48 that partitions the cold water inflow chamber 46 and the hot water inflow chamber 55, and a valve port 47 provided in the partition wall 48. The temperature control valve 45 is simple because the valve body 57 that opens and closes the valve body 57 and the temperature sensitive drive body 58 that drives the valve body 57 based on the temperature of the hot water M in the hot water inflow chamber 55 are provided. Structure.

  Further, since the hot water mixing valve 23 is provided in the hot water outlet passage 14 on the downstream side of the temperature control valve 45, when the hot water temperature suddenly exceeds a predetermined value, the temperature control valve 45 is closed due to a temperature sensing delay. Even if there is a valve delay, the temperature of the hot water M is reduced by the cold water C being mixed with the hot water M by the hot water / mixing valve 23, so that the hot water M 1 having a temperature higher than the predetermined value is discharged from the hot water supply valve 24. There is no risk of being taken out.

It is a systematic diagram showing the heating system concerning one embodiment of the present invention. It is a longitudinal cross-sectional view which shows the vicinity of the pressure valve in a heating system same as the above. It is a longitudinal cross-sectional view which shows the valve closing state of the control valve in a heating system same as the above. It is a longitudinal cross-sectional view which shows the valve opening state of a control valve same as the above. It is a systematic diagram of the conventional heating system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Heating system 11 Heat exchanger 12 Cold water passage 13 Heating fluid passage 14 Hot water outlet passage 16 Orifice 17 Control valve 18 Upstream introduction passage 20 Pressure valve 23 Hot water mixing valve 26 Valve rod (valve drive member)
DESCRIPTION OF SYMBOLS 27 Drive part 28 Valve body part 30 Diaphragm 38 Upstream side introduction chamber 39 Downstream side introduction room 45 Temperature control valve 46 Cold water inflow chamber 47 Valve port 48 Partition wall 55 Hot water inflow chamber 57 Valve body 58 Temperature sensitive drive body S Heating fluid C Cold water M Hot water (hot water)
M1 Hot water VA Heating fluid supply source WA Water supply source

Claims (4)

A heat exchanger that generates hot water by heat exchange between the heating fluid and cold water;
A heating fluid passage for directing the heating fluid from a heating fluid supply to the heat exchanger;
A cold water passage for guiding cold water from a water supply source to the heat exchanger;
A pressure valve that is provided in the cold water passage and opens when the pressure on the upstream side is larger than the pressure on the downstream side by a predetermined value or more;
A control valve that is provided in the heating fluid passage and adjusts the supply amount of the heating fluid to the heat exchanger;
A hot water outlet passage for extracting hot water from the heat exchanger;
In the control valve, the drive unit that drives the valve body unit that opens and closes the heating fluid passage includes an upstream introduction chamber into which cold water on the upstream side of the pressure valve is introduced via the upstream introduction passage, and a diaphragm. A downstream introduction chamber partitioned from the upstream introduction chamber, an orifice for communicating the upstream introduction chamber with the downstream introduction chamber, and a valve drive member for driving the valve body portion by deformation of the diaphragm ,
The hot water outlet passage has a cold water inflow chamber connected to the downstream side introduction chamber, and closes when the hot water temperature is equal to or higher than a predetermined value, so that the cold water from the downstream side introduction chamber passes through the cold water inflow chamber. A heating system provided with a temperature control valve for stopping the flow into the hot water outlet passage.   2. The temperature control valve according to claim 1, further comprising a hot water inflow chamber connected to the hot water outlet passage, a partition wall partitioning the cold water inflow chamber and the hot water inflow chamber, and a valve port provided in the partition wall A heating system comprising a valve body that opens and closes and a temperature-sensitive drive body that drives the valve body based on the temperature of hot water in the hot water inflow chamber.   The heating system according to claim 1 or 2, wherein the orifice is provided in a casing of the diaphragm or a control valve that supports the diaphragm.   4. The heating system according to claim 2, wherein a hot and cold water mixing valve for mixing hot water and cold water is provided on the downstream side of the temperature control valve in the hot water outlet passage.

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