JP4971803B2 - Hot water system - Google Patents

Description

  The present invention relates to a hot water supply system that generates hot water by heating cold water with steam and mixes the hot water and cold water to obtain hot water at a predetermined temperature.

2. Description of the Related Art Conventionally, there is known a hot water supply system that generates hot water by mixing cold water and hot water generated by a heat exchanger with a hot water mixing valve. In this hot water supply system, a part of cold water and steam are guided to the heat exchanger, and hot water generated by the heat exchanger and another part of the cold water are mixed by a hot water mixing valve to generate hot water. Yes. In addition, in the hot water piping for deriving hot water from the heat exchanger, a temperature sensor having a thermal element such as a thermo wax is provided, and a steam control valve is provided in a steam passage for supplying steam to the heat exchanger, Feedback control is performed so as to obtain a predetermined hot water temperature by adjusting the opening of the steam control valve in accordance with the temperature of the hot water (see, for example, Patent Document 1).
JP 2000-241023 A

  In the hot water supply system having the above-described structure, an overshoot in which hot water of a set temperature or higher is discharged from the hot water supply valve (curan) mainly due to a control delay of the hot water / water mixing valve may occur. That is, in the hot water / cold water stop state before the operation of the hot water supply system is started, the entire piping system is at a temperature equivalent to the ambient temperature (lower than the hot water set temperature). When hot water and cold water are supplied to start operation, the hot water mixing valve remains at a low temperature equivalent to the ambient temperature when the hot water supply valve is closed, so the valve body of the hot water mixing valve is provided in the hot water outlet passage. By the operation of the temperature-sensitive drive unit, the hot water side is held in a fully open position and the cold water side is fully closed.

  When the hot water supply valve is opened in this state, it flows only from the hot water flow path of the hot water mixing valve, and after the cold water existing in the upstream portion of the hot water mixing valve is discharged, the hot water becomes hot water mixing valve Pass through. At this time, only when hot water reaches the temperature sensing part of the hot water mixing valve, a temperature sensing element such as a thermo wax reacts to move the valve body, squeeze the hot water side, open the cold water side, and bring it to the set temperature. Feedback will be taken. However, in the initial stage of aeration, although it is a short time, hot water always passes through the mixing valve, and reaches the hot water supply valve with some temperature drop. The temperature when passing through the hot water supply valve varies depending on the initial temperature and amount of hot water, the valve opening of the hot water supply valve, and the piping status, but the amount of heat that passes through is the heat that passes during the delay of the control of the hot water mixing valve. The amount of heat that water has.

  Moreover, in the hot water supply system which produces | generates hot water with the heat exchanger which uses steam as a heat source, overshoot generate | occur | produces also by the hunting at the time of a warm water small flow volume. During the use of hot water, the hot water temperature changes while fluctuating in the range from 80 ° C. to the saturation temperature of the supply steam pressure. When the hot water consumption is relatively high, the steam control valve that controls the supply of steam to the heat exchanger remains ON (open), but when the hot water consumption is relatively low, the steam control valve is turned on and off. And the temperature of the hot water fluctuates accordingly. Further, when the amount of hot water consumption is small, the consumption of hot water is also reduced, so the temperature of the hot water does not drop as much as when hot water is consumed and gradually decreases. When the consumption of hot water is reduced, overheating occurs in the heat exchanger and the temperature of the hot water rises, whereas the temperature sensor for the steam control valve is located in the hot water piping. As the hot water flow rate decreases, the temperature rise of the temperature sensor is delayed as a result of the increase in temperature of the hot water in the heat exchanger being transmitted to the temperature sensor mainly by natural convection of hot water. Therefore, the closing operation of the steam control valve is delayed, the maximum temperature of the hot water reaches near the steam saturation temperature, and the pressure of the hot water also becomes the saturation pressure. When the supply steam pressure to the hot water supply system> the supply cold water pressure, in the above state, the hot water pressure> cold water pressure state occurs in the hot water mixing valve into which the hot water flows.

  When using hot water at a low flow rate (about 3L / min) at 40 ° C setting, as mentioned above, the temperature of the hot water gradually decreases, but the steam control valve opens at around 80 ° C and the heat exchanger Since the steam is supplied to the hot water, the temperature of the hot water rapidly increases, the temperature is raised to near the saturated steam temperature, the steam control valve is closed, and the temperature gradually decreases. In the hot water mixing valve, since the temperature of the hot water is lowered due to the temperature drop of the hot water, the valve opening on the high temperature side of the valve body is increased by the operation of the temperature sensing drive unit that senses this temperature drop. Since hot water with a pressure equal to or higher than the cold water pressure flows in here, the cold water is temporarily prevented from flowing into the mixing chamber, the temperature of the hot water cannot be lowered, and the temperature of the mixing chamber exceeds the target temperature. Rise (overshoot). The temperature sensing drive senses this and drives the valve body in the closing direction, thereby suppressing the inflow of hot water, lowering the pressure in the mixing chamber, allowing the inflow of cold water, and lowering the temperature. However, excessive squeezing of hot water results in undershoot, and hunting that repeats overshoot and undershoot several times occurs. At this time, since the pressure on the hot water side is high, the hot water discharge pressure also varies.

  Therefore, an object of the present invention is to provide a hot water supply system that can suppress overshooting of hot water temperature and hunting of hot water temperature at the time of a small flow of hot water to prevent excessively hot water from being supplied.

In order to achieve the above object, a hot water supply system of the present invention includes a hot water mixing valve that mixes hot water and cold water to generate hot water, and heat that generates the hot water by heat exchange between steam and the cold water. A single mixing valve body that includes an exchanger and a steam control valve that adjusts the amount of steam flowing into the heat exchanger, and the hot and cold water mixing valve opens and closes the hot water introduction passage and the cold water introduction passage. And a mixing valve drive unit that drives the valve body in accordance with the temperature of the generated hot water, and the steam control valve includes a steam valve body that opens and closes a steam passage, and the generated hot water And a steam valve drive unit that operates according to temperature and drives the steam valve body by converting thermal energy of hot water into mechanical displacement, and further leads out the hot water from the hot and cold mixing valve In addition, the passage area of the lead-out passage is suddenly increased and then decreased. Agitator for promoting the agitation of the hot water is provided by.

  According to this configuration, even if hot water greatly exceeding the set temperature passes through the hot water mixing valve due to a delay in the control of the hot water mixing valve, the hot water is provided in the hot water outlet passage. Since the water is sufficiently stirred with the preceding hot water or cold water, the temperature of the hot water is effectively lowered. Therefore, hot water having a high peak temperature does not directly come out of the hot water outlet valve of the hot water outlet passage, and the peak temperature in the hot water temperature overshoot phenomenon that occurs in the initial stage of hot water supply or the hot water temperature hunting phenomenon at a small flow rate of hot water. This can reduce the temperature, thereby preventing excessively hot water from being supplied.

  Preferably, the stirrer includes a cylinder having a large inner diameter, and an inlet and an outlet having a small inner diameter provided at one end and the other end of the cylinder, respectively. Thereby, the hot water flowing into the stirrer from the inflow port generates a turbulent flow due to a large change in the flow velocity in the cylindrical body having a large inner diameter, and the stirring is promoted by the turbulent flow to lower the temperature.

  Preferably, the stirrer includes a cylinder having a large inner diameter, an inlet and an outlet having a small inner diameter provided at one end and the other end of the cylinder, and the cylinder connected to the inlet. A diffuser having a small diameter disposed inward, and the diffuser has a cylindrical shape having a bottom wall and a peripheral wall at a downstream end, and hot water from the inflow port is supplied to the peripheral wall on the inner side of the diffuser. A plurality of diffusion holes are formed to diffuse outward from the outside.

  According to this configuration, the hot water is ejected from the plurality of diffusion holes to the inside of the cylindrical body, so that the contact area with the hot water existing in the cylindrical body in advance is increased. Thereby, stirring of warm water is performed efficiently.

  More preferably, the stirrer includes a cylindrical body having a large inner diameter, and a deflecting portion that introduces the hot water in the outlet passage from the one end of the cylindrical body into the cylindrical body, An inlet, an outlet, and a partition plate for partitioning between them, the hot water flowing in from the inlet is redirected by the partition plate, passes through one side of the partition plate, is guided into the cylinder, and from the cylinder It passes through the other side of the partition plate and flows out from the outlet.

  According to this configuration, the hot water in the outlet passage collides with the partition plate of the turning portion from the inflow port, and its flow direction is suddenly changed, and passes through one side of the partition plate to enter the cylinder. As a result, the turbulent flow of hot water is further promoted and the stirring is performed efficiently.

  More preferably, the stirrer is a cylinder having a large inner diameter, an inlet and an outlet having a small inner diameter provided at one end and the other end of the cylinder, and the inlet disposed in the cylinder. And a collision member that collides with the hot water flowing in and diffuses the hot water into the cylinder.

  Also with this configuration, the hot water in the outlet passage collides with the collision member from the inflow port, the flow direction thereof is suddenly changed, and passes through one side of the collision member to be guided into the cylinder. Turbulence is further promoted, and stirring is efficiently performed.

  According to the hot water supply system according to the present invention, even when hot water greatly exceeding the set temperature passes through the hot water mixing valve due to a delay in control of the hot water mixing valve having the mixing valve body and the mixing valve drive unit. The hot water is sufficiently agitated with the preceding hot water or cold water in the stirrer that has been reduced and then rapidly increased in passage area, so the temperature of the hot water is effectively lowered and has a high peak temperature. Hot water will no longer come out of the hot water outlet valve. Therefore, the peak temperature in the overshoot phenomenon of the hot water temperature occurring at the initial stage of hot water supply or the hunting phenomenon of the hot water temperature at the time of a small flow of hot water can be reduced.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a system diagram of a hot water supply system according to the present invention. A hot water supply system 10 shown in the figure includes a plate heat exchanger 11 that generates hot water H by heating cold water C1 with the heat of steam S. The plate-type heat exchanger 11 is formed by stacking a plurality of plates, and alternately arranging the passages of the steam S and the passages of the cold water C1 through the plates, and is compact and has a large heat exchange capacity.

  The hot water supply system 10 further includes a cold water passage 12 that leads a part of the cold water C supplied from the water supply source WA at a constant water pressure to the heat exchanger 11 through the check valve 33 as cold water C1 for generating hot water. A hot water passage 13 for deriving the hot water H generated by the heat exchanger 11, a hot water mixing valve 14 disposed in the middle of the hot water passage 13, and a branch point A of the cold water passage 12. And a cold water mixing passage 15 that guides another part of the cold water C to the hot water mixing valve 14 as mixing cold water C2 and a steam passage that leads the steam S supplied from the steam supply source VA to the heat exchanger 11. 16 and a discharge passage 17 for discharging the drain (condensate) of the steam S supplied to the heat exchanger 11. In the hot water / water mixing valve 14, the cold water C <b> 2 is mixed with the hot water H from the heat exchanger 11 to generate hot water M.

  In the steam passage 16, a steam control valve 18 that adjusts the flow rate of the steam S according to the temperature of the cold water C 1 after being heated by heat exchange with the steam S in the heat exchanger 11, that is, the temperature of the hot water H. Is arranged. The steam control valve 18 includes a steam valve body 18a that opens and closes the steam passage 16 to adjust the flow rate of the steam S, and a steam valve drive unit 18b that drives the steam valve body 18a according to the temperature of the hot water H. I have.

  A steam trap 19 is disposed in the discharge passage 17, and the mixed fluid of the steam S discharged from the heat exchanger 11 and its condensed water traps the steam, and only the condensed water is drained from the discharge passage 17 to the outside. D is discharged.

  A hot water outlet passage 21 is connected to the outlet of the hot water mixing valve 14 to guide the hot water M generated by the hot water mixing valve 14 to a hot water outlet valve (curan) 22 serving as a hot water discharge port. In the middle, a stirrer 1 that promotes stirring of the hot water M from the hot water / water mixing valve 14 is provided, and a temperature sensor 25 is disposed in the hot water outlet passage 21 on the downstream side of the stirrer 1. The temperature sensor 25 detects the temperature of the hot water M guided to the hot water inlet valve 22 via the hot water / water mixing valve 14, and the detected temperature data is displayed on the temperature display unit 26 connected to the temperature sensor 25. Can be confirmed from the outside.

  A cold water C supply port 27 having a manual valve 28 is connected to the water supply source WA, and a water supply Y-strainer 29 for removing dust mixed in the cold water C is disposed downstream thereof. Similarly, a steam S supply port 30 having a manual valve 31 is connected to the steam supply source VA, and a steam Y-type strainer 32 is disposed downstream thereof.

  As shown in FIG. 2, the steam control valve 18 has a cylindrical casing 40, and a steam valve body 18 a that opens and closes the steam passage 16 to adjust the flow rate of the steam S is provided in the lower case 41. Steam valve driving portions 18b for driving the steam valve bodies 18a according to the temperature of H are accommodated in the upper case 42, respectively. The steam valve drive unit 18b includes a hot water passage 13 and a thermal element (for example, thermo wax) located in the hot water passage 13, and converts the thermal energy of the hot water H into a mechanical displacement. And a member 61 that transmits this displacement to the steam valve body 18a. The temperature of the hot water H flowing in the hot water passage 13 is detected by the temperature sensing unit 60 by the steam control valve 18, and the steam valve body 18a is driven by the steam valve driving unit 18b according to the temperature of the hot water H. If the temperature of the hot water H is high, the steam control valve 18 reduces the supply amount of the steam S to the heat exchanger 11 to lower the temperature of the hot water H, and if the temperature of the hot water H is low, the steam control valve. 18, the supply amount of the steam S to the heat exchanger 1 is increased, and the temperature of the hot water H is increased.

  Next, the structure of the hot and cold water mixing valve 14 will be described with reference to FIG. In the figure, a hot water / mixing valve 14 is provided in a body 40 with an inlet 41 for hot water H connected to the hot water passage 13, an inlet 42 for cold water C 2 connected to the cold water passage 15 for mixing, According to the temperature of the mixing chamber 43 which mixes cold water C2 and produces | generates warm water M, the disk-shaped single mixing valve body 44 which opens and closes the hot water inlet 41 and the cold water inlet 42, and the produced | generated warm water M And a mixing valve drive unit 45 for driving the mixing valve body 44. The mixing valve drive unit 45 includes a temperature sensing unit 46 having a thermosensitive element such as a thermo wax, and a valve rod 47 that transmits the thermal displacement of the temperature sensing unit 46 to the mixing valve body 44. The hot water / water mixing valve 14 mixes the hot water H and the cold water C2 and guides the hot water H and the cold water C2 from the hot water outlet 37 to the outlet passage 21 as hot water M.

  The mixing valve body 44 is formed by connecting a boss portion 44a into which a valve 47 is inserted and an outer ring portion 44b with radial ribs 44c. The mixing valve body 44 is axially moved by a mixing valve driving portion 45 (see FIG. 3). The opening degree of the hot water valve port 48 at the lower end and the cold water valve port 49 at the upper end of the ring portion 44b is adjusted by moving in the vertical direction. That is, the passage of both the hot water H and the cold water C2 is opened and closed by the single mixing valve body 44. A cap 50 that adjusts the set temperature of the hot water M by adjusting the amount of displacement of the temperature sensing unit 46 is attached to the upper portion of the body 40.

  As shown in FIG. 4, the stirrer 1 includes a metal cylinder 2 having a large inner diameter D1, and inner diameters D2 provided concentrically with the cylinder 2 at one end and the other end of the cylinder 2, respectively. An inlet 3 and an outlet 4 having a small D3 are provided. In this case, the inner diameters D2 and D3 of the inlet 3 and the outlet 4 are the same, and in order to enhance the stirring effect, the inner diameter of the cylindrical body 2, that is, the cylindrical body 2 is formed with respect to the inner diameters D2 and D3. The diameter D1 of the stirring chamber 1M is about 2 times to 5 times (D1 = 2 to 5D2), and the axial length L of the stirring chamber 1M is about 5 times to 10 times (L = 5 to 5 times). 10D2). As described above, the hot water M flowing into the stirrer 1 from the outlet passage 21 is changed in the flow velocity by rapidly increasing the passage area of the hot water outlet passage 21 in the cylindrical body 2 and then decreasing it at the outlet 4. As a result, strong turbulence is generated and stirring is promoted.

  Next, the operation of the hot water supply system having the above configuration will be described. First, in FIG. 1, when the steam manual valve 31 is opened, the steam S from the steam supply source VA is introduced from the supply port 30 into the heat exchanger 11 via the steam passage 16 and the steam control valve 18. Similarly, when the cold water manual valve 28 is opened, a part of the cold water C from the hot water supply source WA is introduced into the heat exchanger 11 through the cold water passage 12 from the supply port 27 as cold water C1 for generating hot water. In the heat exchanger 11, the cold water C 1 and the steam S are heat-exchanged, and the heated hot water H (for example, 90 to 100 ° C.) is guided to the drive unit 18 b of the steam control valve 18 through the hot water passage 13. Then, it is guided to the hot and cold mixing valve 14. On the other hand, a part of the cold water C is led to the hot water mixing valve 14 through the cold water mixing passage 15 as the cold water C2 for mixing, and the cold water C2 and the hot water H are mixed at a predetermined mixing ratio to warm water M (for example 30 to 30). 70 ° C.). The hot water M is used for hot water supply as hot water M having a predetermined temperature through the outlet passage 21 by opening the hot water supply valve 22.

  In the above operation, when the hot water supply system is stopped, that is, when the operation is started from the steam / water supply stop state, as described above, the hot water valve port 48 of the hot water mixing valve 14 of FIG. 14, a small amount of hot water H passes through the hot water mixing valve 14 and passes through the outlet passage 21 until the temperature sensing portion 46 of the hot water mixing valve 14 reacts and the hot water valve port 48 is throttled. Flow into. At this time, since the agitator 1 of FIG. 4 is provided in the outlet passage 21, the hot water H that has flowed in is agitated with the cold water C2 or hot water M existing in the outlet passage 21 prior to the hot water H. Stir in vessel 1. That is, in the stirrer 1, the hot water H flows from the inlet 3 with the small inner diameter D2 and then suddenly enters the cylindrical body 2 with the large inner diameter D1 (stirring chamber 1M), and further at the outlet 4 with the small inner diameter D3. Since the water is squeezed, a strong turbulent flow is generated due to a change in flow velocity generated at that time, and the hot water H is sufficiently agitated with the cold water C2 or the hot water M in the cylindrical body 2.

  Thereby, the temperature of the hot water M detected by the hot water sensor 25 downstream of the stirrer 1 in FIG. 1 is reduced, and the large overshoot 10a of the conventional example as shown in FIG. 16A is eliminated, and FIG. As shown in B), the peak temperature of the overshoot 10b was significantly reduced. Similarly, due to the stirring effect in the stirrer 1, as shown in FIG. 17A, the hot water temperature at the time of a small flow of hot water generated when the supply steam pressure to the hot water supply system is larger than the supply cold water pressure. Hunting 11a can also be suppressed, and as shown in FIG. 17 (B), the peak temperature of the hot water temperature hunting 11b is lowered.

  FIG. 5 shows the agitator 1 of the second embodiment. This 2nd Embodiment adds the small-diameter cylindrical diffuser 5 inside the cylinder 2 of 1st Embodiment. The diffuser 5 is concentric with the cylindrical body 2, communicates with the inlet 3, has the same inner diameter D 2 as the inlet 3, and includes a bottom wall 5 a and a peripheral wall 5 b at the downstream end, A plurality of diffusion holes 6 are formed in the peripheral wall 5b to diffuse the hot water M from the inside of the diffuser 5 to the outside. The diffusion hole 6 is formed so as to open in a direction orthogonal to the axial center CC of the diffusion body 5. According to the second embodiment, even when hot water H flows from the inlet 3 at the start of operation, the hot water H is dispersed from the plurality of diffusion holes 6 and ejected into the cylindrical body 2. Thus, the contact area between the cold water C2 or the hot water M existing inside the cylinder 2 is increased, and the hot water H and the cold water C2 or the hot water M are effectively stirred. In order to enhance the stirring effect, the inner diameter D1 of the cylindrical body 2 (the diameter of the stirring chamber 1M) D1 is 2.5 to 5 times (D1 = 2.5) with respect to the inner diameter D2 of the inlet 3 and the diffuser 5. To 5.0D2), and the length L of the stirring chamber 1M is desirably 5 times to 10 times (L = 5 to 10D2).

  FIG. 6 shows a stirrer according to the third embodiment. As shown in the figure, in the third embodiment, the diffusion holes 6 arranged in the direction of the axial center CC of the diffusion body 5 are alternately directed in the opposite direction by 15 ° with respect to the radial direction orthogonal to the axial center CC. It is inclined to open. According to the third embodiment, since the hot water H flowing in from the inlet 3 is more effectively dispersed and discharged into the cylindrical body 2, the contact area between the hot water H and the cold water C2 or the hot water M is reduced. The stirring effect due to the increase is increased.

  FIG. 7: shows the principal part of the stirrer of 4th Embodiment, (A) is a longitudinal cross-sectional view of the diffuser 5 which shows the arrangement | positioning state of the diffuser hole 6, (B) is a VII-VII sectional view taken on the line VII-VII. Is shown. In the fourth embodiment, as shown in FIG. 7B, four diffusion holes 6 are arranged at equal intervals (90 °) in the circumferential direction at the same position in the axial center CC direction on the peripheral wall 5b of the diffusion body 5. As shown in FIG. 7A, the diffusion holes 6 and 6 adjacent to each other in the axial CC direction are shifted by 45 ° in the circumferential direction. According to this 4th Embodiment, since the dispersion | distribution of the hot water H from the diffusion hole 6 is promoted again, the stirring effect becomes large.

  FIG. 8 shows a stirrer according to the fifth embodiment. As shown in the figure, in the fifth embodiment, a plurality of diffusion holes 6 are spirally arranged around the axial center CC in the peripheral wall 5b of the diffusion body 5. The opening direction of the diffusion hole 6 is inclined by about 15 ° toward the axial CC direction outlet (outlet) 4 side with respect to the radial direction of the cylindrical body 2 that matches the radial direction of the diffuser 5, and As shown in FIG. 9B, which is a cross-sectional view taken along the line IX-IX in FIG. 9A, the radiator 5 is inclined by about 15 ° with respect to the radiation direction R. Adjacent diffusion holes 6 in this spiral row are arranged in a spiral manner with a constant pitch (for example, 45 °) in the circumferential direction. According to the fifth embodiment, the hot water H is jetted in an oblique direction so as to form a spiral flow from the diffusion hole 6 of FIG. Thereby, since the hot water H ejected from the diffusion hole 6 is in contact with the cold water C2 or the hot water M existing in advance in the cylindrical body 2 while swirling, the stirring is efficiently performed.

  In the second to fifth embodiments, the preferable relationship between the inlet 3, the outlet 4, the inner diameter of the diffuser 5 and the cylinder 2, and the length of the stirring chamber 1M is the same as that of the second embodiment of FIG. Are the same.

  FIG. 10 shows a stirrer according to the sixth embodiment. As shown in the figure, the stirrer 1 is configured to change the direction of the cylindrical body 2A having a large inner diameter D1 (left end in FIG. 10) and the hot water M or hot water H in the outlet passage 21 from one end of the cylindrical body 2A. And a turning portion 7 to be introduced into the cylindrical body 2A. This turning portion 7 includes an inflow port 3, an outflow port 4, and a partition plate 8 for partitioning between them. The inflow port 3 and the outflow port 4 are positioned on a straight line, the partition plate 8 is orthogonal to the opening direction of the inflow port 3 and the outflow port 4, and a part of the tip thereof enters the cylindrical body 2 </ b> A. Yes. The turning portion 7 has a cylindrical connection portion 9 extending in parallel with the partition plate 8, and is connected to the cylinder body 2 </ b> A via the connection portion 9.

  According to the sixth embodiment, the hot water H that has flowed in from the inlet 2 at the start of operation collides with the partition plate 8 and its flow is changed, and one side of the partition plate 8 (the upper side in FIG. 10) It passes through and is guided to the cylindrical body 2 </ b> A, reverses within the cylindrical body 2 </ b> A, passes through the other side of the partition plate 8 (lower side in FIG. 10), and is guided to the outlet 3. At that time, a strong vortex or turbulent flow is generated due to a sudden change in the flow of the hot water H, and the cold water C2 or hot water M remaining in the cylindrical body 2A in advance is efficiently stirred in the cylindrical body 2A. . In order to promote stirring, the inner diameter D4 of the connecting portion 9 is 1.5 times or more and 2.5 times or less (D4 = 1.D) with respect to the inner diameters D2 and D3 (D2 = D3) of the inlet 3 and the outlet 4. 5 to 2.5D2), the inner diameter D1 of the cylindrical body 2A is 3 to 5 times (D1 = 3 to 5D2), and the axial length L is 5 to 10 times (L = 5). To 10D2).

  11 and 12 show a stirrer according to a seventh embodiment. As shown in FIG. 11, this stirrer 1 has a cylindrical body 2 having a large inner diameter D1, and small inner diameters D2 and D3 provided eccentrically with the cylindrical body 2 at one end and the other end of the cylindrical body 2, respectively. An inlet 3 and an outlet 4 are provided. The inlet 3 and the outlet 4 are concentric. The inflow port 3 and the outflow port 4 are formed by opening ends of pipes 53 and 54 connected to the cylindrical body 2. A collision member 55 that collides with the hot water M flowing from the inlet 3 and diffuses the hot water M into the cylindrical body 2 is disposed inside the cylindrical body 2. The collision member 55 is made of a plate material, and is fixed to the inner surface of the peripheral wall of the cylindrical body 2 by welding, for example, so that the collision surface 55 a is orthogonal to the opening direction of the inflow port 3. The position of the collision surface 55a is preferably near the middle in the axial direction of the cylindrical body 2.

  As shown in FIG. 12, which is a plan view, the collision member 55 has a half-moon shape along the inner surface of the cylindrical body 2, and completely overlaps the inlet 3 when viewed from the hot water inflow direction to the inlet 3. Opposite to. However, the size of the collision member 55, that is, the size of the collision surface 55a may be set to a small half-moon shape so that it does not completely overlap the inflow port 3 but overlaps more than half of the inflow port 3. .

  In the stirrer 1 of FIG. 11, the hot water H that has flowed in from the inlet 2 at the start of operation collides with the collision surface 55 a of the collision member 55 and is turned by approximately 90 °, generating a strong vortex inside the cylinder 2. To do. At the same time, the hot water H flowing in from the inlet 3 having a small inner diameter D2 enters the cylinder 2 (stirring chamber 1M) having a large inner diameter D1 to rapidly increase the passage area in the cylinder 2 and then flow. By reducing at the outlet 4, the hot water H flowing into the stirrer 1 from the inside of the outlet passage 21 generates a strong turbulent flow including a vortex due to a change in the flow velocity, thereby promoting stirring. Thus, the hot water H is sufficiently agitated with the cold water C2 or the hot water M in the cylindrical body 2 by the turbulent flow due to the direction change and the flow velocity change.

  In addition, since the inlet 3 and the outlet 4 are eccentric with respect to the cylinder 2, the collision member 55 is supported by a portion close to the eccentric inlet 3 on the peripheral wall of the cylinder 2, so that the small collision member 55 There is an advantage that a strong direction can be imparted to the entire inflow port 3. Further, in many cases, there is a space only on one side around the lead-out passage 21, and in this case, the bulging portion (right side portion in FIG. 11) of the eccentric cylindrical body 2 is directed to the side having the space, thereby stirring. The arrangement of the vessel 1 is facilitated.

  In the case of the seventh embodiment, the inner diameters D2 and D3 of the inlet 3 and the outlet 4 in FIG. 11 are the same, and in order to enhance the stirring effect, the inner diameter of the cylindrical body 2 with respect to these inner diameters D2 and D3. That is, the diameter D1 of the stirring chamber 1M formed by the cylindrical body 2 is about 2 times to 5 times (D1 = 2 to 5D2), and the axial length L of the stirring chamber 1M is about 2 times or more to It is desirable that it is 10 times or less (L = 2 to 10D2), more preferably 2.5 to 5 times (L = 2.5 to 5D2).

  13 and 14 show an agitator according to an eighth embodiment. The eccentric relationship between the cylindrical body 2, the inlet 3 and the outlet 4 is the same as that of the seventh embodiment shown in FIGS. As shown in FIG. 14, the collision member 55 has a U shape when viewed from the bulging side of the cylindrical body 2 (the right side in FIG. 13). The collision member 55 is made of a plate material, and has a pair of left and right leg portions 55b and 55b and a top wall portion 55c connected to the upper end portion thereof, and the top surface of the top wall portion 55c is in the opening direction of the inflow port 3. Thus, the collision surface 55a is orthogonal. The leg portion 55 b is fixed to the inner surface of the bottom wall of the cylindrical body 2 by, for example, welding and supported by the cylindrical body 2. The position of the collision surface 55a is preferably a position closer to the inflow port 3 than near the middle in the axial direction of the cylindrical body 2 in order to give a strong turning.

  As shown in FIG. 15, the collision surface 55 a has a rectangular shape and faces the inflow port 3 so as to almost completely overlap the inflow port 3 when viewed from the hot water inflow direction. However, the size of the collision surface 55a may be set to a small shape so that it does not completely overlap the inflow port 3 but overlaps more than half of the inflow port 3.

  In the stirrer 1 of FIG. 13, the hot water H that has flowed in from the inlet 2 at the start of operation collides with the collision surface 55a of the collision member 55 and is turned by approximately 90 °, and further wraps around below the top wall portion 55c. As a result, a strong vortex is generated inside the cylindrical body 2. At the same time, the hot water H flowing in from the inlet 3 having a small inner diameter D2 enters the cylindrical body 2 (stirring chamber 1M) having a large inner diameter D1, and the outlet 4 having a small inner diameter D3 while performing the turning and turning. Therefore, a turbulent flow including a vortex is generated due to a change in flow velocity generated at that time. Thus, the hot water H is sufficiently agitated with the cold water C2 or the hot water M in the cylindrical body 2 by the turbulent flow due to the direction change and the flow velocity change. Further, since the inflow port 3 and the outflow port 4 are eccentric with respect to the cylinder 2, when there is a space only on one side around the lead-out passage 21, the expansion of the eccentric cylinder 2 on the side where the space is present. By directing the protruding portion (the right portion in FIG. 13), the arrangement of the stirrer 1 is facilitated.

  In the case of the eighth embodiment, the inner diameters D2 and D3 of the inlet 3 and the outlet 4 in FIG. 11 are the same, and in order to enhance the stirring effect, the inner diameter of the cylindrical body 2 with respect to these inner diameters D2 and D3. That is, the diameter D1 of the stirring chamber 1M formed by the cylindrical body 2 is about 2 times to 5 times (D1 = 2 to 5D2), and the axial length L of the stirring chamber 1M is about 2 times or more to It is desirable that it is 10 times or less (L = 2 to 10D2), more preferably 2.5 to 5 times (L = 2.5 to 5D2).

  In addition, in the said 2nd Embodiment to 8th Embodiment, although the cylinder 2 is cylindrical shape, for example, a square shape, a triangular shape, or an irregular cross-sectional shape may be sufficient. In this case, the inner diameter D1 of the cylinder 2 is an effective inner diameter that is the square root of the cross-sectional area. Moreover, although the cross-sectional shape of the radiation hole 6 of the radiator 5 is circular, it may be, for example, a slit shape, a square shape, a triangular shape, or the like.

It is a systematic diagram of the hot water supply system which concerns on this invention. It is a longitudinal cross-sectional view of the steam control valve used with the hot water supply system. It is a longitudinal cross-sectional view of the hot and cold water mixing valve used in the hot water supply system. It is a longitudinal cross-sectional view which shows the stirrer of 1st Embodiment. It is a longitudinal cross-sectional view which shows the stirrer of 2nd Embodiment. It is a longitudinal cross-sectional view which shows the stirrer of 3rd Embodiment. (A) is the longitudinal cross-sectional view which shows the diffuser of 4th Embodiment, (B) is the VII-VII sectional view taken on the line of (A). It is a longitudinal cross-sectional view which shows the stirrer of 5th Embodiment. (A) is the longitudinal cross-sectional view which shows the diffuser of 5th Embodiment, (B) is the IX-IX sectional view taken on the line of (A). It is a longitudinal cross-sectional view which shows the stirrer of 6th Embodiment. It is a longitudinal cross-sectional view which shows the stirrer of 7th Embodiment. It is a top view which shows the stirrer of 7th Embodiment. It is a vertical side view which shows the stirrer of 8th Embodiment. It is a vertical front view which shows the stirrer of 8th Embodiment. It is a top view which shows the stirrer of 8th Embodiment. It is a characteristic view which shows the warm water temperature of the ventilation | gas_flowing initial stage, (A) shows a prior art example, (B) shows the case of this invention, respectively. It is a characteristic view which shows the warm water temperature at the time of a small flow of warm water, (A) shows a prior art example, (B) shows the case of this invention, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stirrer 2, 2A Cylindrical body 3 Inlet 4 Outlet 5 Radiator 6 Radiator 6 Radiation hole 7 Turning part 8 Partition plate 10 Hot water supply system 11 Heat exchanger 14 Hot water mixing valve 18 Steam control valve 18a Steam valve body 18b Steam valve drive Part 21 Lead-out passage 55 Collision member C (C1, C2) Cold water H Hot water M Hot water S Steam

Claims (5)

A hot and cold water mixing valve that generates hot water by mixing hot water and cold water, a heat exchanger that generates the hot water by exchanging heat between steam and the cold water, and an amount of steam that flows into the heat exchanger are adjusted. A steam control valve ,
The hot and cold water mixing valve includes a single mixing valve body that opens and closes the hot water introduction passage and the cold water introduction passage, and a mixing valve drive section that drives the valve body in accordance with the temperature of the generated hot water. Have
The steam control valve operates according to the temperature of the steam valve body that opens and closes the steam passage and the temperature of the generated hot water, and drives the steam valve body by converting the thermal energy of the hot water into a mechanical displacement. A steam valve drive unit that
Furthermore, the hot water supply system provided with the stirrer which accelerates | stimulates stirring of warm water by making the passage area which guide | leads out warm water from the said hot-water mixing valve increase the passage area of this extraction passage rapidly, and then reducing it. The hot water supply system according to claim 1 , wherein the stirrer includes a cylindrical body having a large inner diameter, and an inlet and an outlet having a small inner diameter provided at one end and the other end of the cylindrical body, respectively. 2. The stirrer according to claim 1 , wherein the stirrer is a cylinder having a large inner diameter, an inlet and an outlet having a small inner diameter provided at one end and the other end of the cylinder, and the cylinder communicating with the inlet. A small-diameter diffuser disposed inside the body,
The diffuser has a cylindrical shape having a bottom wall and a peripheral wall at a downstream end, and a plurality of diffusion holes are formed in the peripheral wall to diffuse hot water from the inflow port from the inside of the diffuser to the outside. There is a hot water system. In Claim 1 , the stirrer includes a cylindrical body having a large inner diameter, and a deflecting portion that introduces warm water in the outlet passage from the one end of the cylindrical body into the cylindrical body,
The turning section has an inflow port, an outflow port, and a partition plate that partitions between the inflow port, the hot water flowing in from the inflow port is redirected by the partition plate, passes through one side of the partition plate, and is guided into the cylinder. A hot water supply system that passes the other side of the partition plate from the cylinder and flows out from the outlet. 2. The stirrer according to claim 1 , wherein the stirrer is disposed in the cylinder, the cylinder having a large inner diameter, the inlet and the outlet having a small inner diameter provided at one end and the other end of the cylinder, respectively. A hot water supply system comprising a collision member that collides with hot water flowing from an inlet and diffuses the hot water into a cylinder.

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