JP2007064543A - Multiply arranged double pipe heat exchanger and water heater therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multiply arranged double pipe heat exchanger capable of efficiently washing the inside of the inner pipe of a double spiral pipe that forms a heat transfer pipe, using balls and without stopping operation. <P>SOLUTION: The multiply arranged double pipe heat exchanger has at least a spiral double heat transfer pipe comprising an inner spiral pipe positioned within the spiral inner diameter of an outer spiral pipe with a predetermined gap therebetween, the inner spiral pipe allowing hot water to pass therethrough, with materials in the hot water clinging thereto. A ball injector for injecting elastic balls for washing the inner surface of the heat transfer pipe is connected to the inner spiral pipe. The inner spiral pipe is disposed on a higher, different level than the outer spiral pipe along their height direction, and has tangentially extended portions at both wound ends thereof. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat exchanger, and in particular, a multi-placement type double-pipe heat exchanger suitable for a facility for heating cold water by heat exchange from bathroom drainage (hereinafter referred to as hot drainage) or source water in a hot spring facility, and It is related with the heating water heater provided.

  In hot spring facilities, a system that heats cold water through a heat exchanger and heats it up to an appropriate temperature with a boiler without throwing away the hot wastewater as it is, and effectively uses the thermal energy of the hot wastewater As a facility for this purpose, a double-pipe heat exchanger can be considered.

  As a double-pipe heat exchanger, for example, a double-pipe heat exchanger disclosed in Japanese Patent Laid-Open No. 2005-3209 has been proposed as an example applied to a water heater that generates hot water using a heat pump. ing.

  The heat exchanger includes first and second heat transfer tubes that include a first flow path through which a first fluid flows and a second flow path through which a second fluid flows, both of which are spirally wound. The second heat transfer tube is configured to be doubled inside the wound first heat transfer tube. The space formed inside the heat transfer tube wound in a spiral shape is effectively used to increase the mounting density of the heat exchanger, thereby forming a compact heat exchanger that is excellent in storage in equipment.

JP 2005-3209 A

  The heat exchanger described above is manufactured to be applied to a water heater that generates hot water using a heat pump, so that a double spiral tube formed by an inner tube and an outer tube is formed in order to increase the distance of heat exchange. Adopt a structure that connects at the top. When adopting this structure for a hot water heater in a hot spring facility, the curvature of the connecting part is small and clogging is likely to occur, so the cleaning ball passes inside the inner pipe through which warm drainage flows. It is impossible to wash it. For this reason, in order to clean, it is necessary to stop the operation and remove the connecting pipe, throw in a ball and force water through, or use a cleaning chemical without using the ball. However, these cleaning methods are cumbersome and there is a concern of environmental pollution when using chemicals.

  The present invention has been made in view of the above-mentioned problems, and is capable of efficiently cleaning the inner surface of the heat transfer tube of the inner tube of the double spiral tube without stopping the operation without stopping the operation of the apparatus using an elastic ball. An object of the present invention is to provide a type double pipe heat exchanger and a heating water heater provided with the same.

  The present invention has been made in view of the above-mentioned problems, and is capable of efficiently cleaning the inner surface of the heat transfer tube of the inner tube of the double spiral tube without stopping the operation without stopping the operation of the apparatus using an elastic ball. An object of the present invention is to provide a type double pipe heat exchanger and a heating water heater provided with the same.

In the present invention, the inner spiral tube through which the warm water passes and the deposits in the warm water adhere is arranged with a predetermined gap within the spiral inner diameter of the outer spiral tube to constitute at least a spiral double heat transfer tube, the inner spiral In the multi-placement type double-pipe heat exchanger in which an elastic ball that cleans the inner surface of the heat transfer tube is put into the tube,
The inner spiral tube has a tangential lead-out portion with a structure in which the inner spiral tube is drawn tangentially from the non-existing portion of the winding portion of the outer spiral tube formed in the lateral direction of the both end portions. A multi-placement double-pipe heat exchanger is provided.

  According to the present invention, in the above-described configuration, the inner spiral tube is arranged in a height difference with respect to the outer spiral tube, thereby forming a non-existing portion of the winding portion of the outer spiral tube. The present invention provides a multi-placement type double-pipe heat exchanger.

  The present invention is the above, wherein the inner spiral tube has at least a spiral double inner spiral tube structure, and an upper ball mooring device and a lower ball mooring device are connected to the tangential lead portions, respectively. A multi-arrangement type double-pipe heat system, characterized in that the flow path of the elastic ball for cleaning the inner surface of the heat transfer tube of each inner spiral tube disposed between the ball mooring devices is formed independently. Provide an exchange.

  One or both of the upper ball mooring device and the lower ball mooring device according to the present invention are the first flange pipe connected to the inner spiral pipe and the outer spiral pipe, respectively, and hot water intake A multi-placement type double pipe comprising a second flange pipe, a ball mooring chamber, an observation window, and a stopper for locking movement of the elastic ball to the second flange pipe A heat exchanger is provided.

  The present invention is the above-described multi-placement double-tube type, wherein either or both of the upper ball mooring device and the lower ball mooring device are provided with a valve for charging and discharging the elastic ball. Provide heat exchanger.

  The present invention includes the above-described multi-placement double pipe heat exchanger, and includes two three-way valves for switching the flow of the hot water, one three-way valve, the upper ball mooring device, the other three-way valve, Provided is a heating water heater provided with a pipe connecting a lower ball mooring device.

  The present invention further includes a plurality of double-arranged double-pipe heat converters juxtaposed, and each tangential lead portion is aligned in the same direction, and is common to each upper ball mooring device and lower ball mooring device. Provided is a heating water heater provided with a hot water header.

  According to the present invention, the cleaning ball easily passes without clogging, and the ball is reciprocated through the upper and lower spiral tubes between the ball mooring devices at regular intervals, so that the cleaning can be efficiently performed without stopping the operation. It can be performed.

  In addition, if a transparent cover is installed on the ball mooring device, the deterioration and contamination of the ball can be observed from the outside, so that there is an effect that replacement with a new ball can be performed appropriately. Furthermore, when a valve is installed in the ball mooring device, a dirty ball can be efficiently discharged by rotating a lever of the valve.

  A double tube that is a spiral double heat transfer tube that forms a heat transfer tube in which an inner tube that is an inner spiral tube is inserted within a spiral inner diameter of an outer tube that is an outer spiral tube with a predetermined gap is formed into a plurality of spiral shapes, respectively. Independently arranged in multiple steps in the height direction, the winding lower end of each of the plurality of double tubes and the winding upper end are drawn out in the tangential direction of the spiral winding in the height direction, respectively. A ball mooring device is installed at each of the lower end and the upper end, allowing hot water to pass through the inner pipe into which the cleaning balls have been introduced, and allowing cold water to pass through the outer pipe or the gap or both, The warm drainage flows alternately into the inner pipe at a predetermined cycle from the lower end of the winding and the upper end of the winding, and the ball can reciprocate between the upper and lower ball mooring devices without stagnation. Characterized in that as can solve the above problems by multiplexing arrangement type double-pipe heat exchanger.

  A first embodiment of the ball mooring apparatus includes a first flange pipe for connection to the inner pipe, a second flange pipe for taking in hot water, a ball mooring chamber, an observation window, and a stopper. The ball can move to the first flange tube side with this stopper, but the movement to the second flange tube side is locked and the observation window is formed of a transparent member. The above-mentioned problem can be solved by a multi-arrangement type double tube heat exchanger.

  A second embodiment of the ball mooring device includes a first flange pipe for connection to the inner pipe, a second flange pipe for taking in hot water, a ball mooring chamber, a valve, and a stopper. The stopper allows the ball to move to the first flange pipe side, but locks the movement to the second flange pipe side and allows the valve to discharge the warm drainage and the ball. The above-mentioned problem can be solved by a multi-arrangement type double-pipe heat exchanger.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings.

  1 to 9 show an embodiment of a multi-placement double tube heat exchanger according to the present invention.

FIG. 1 is a plan view of a multi-placement double pipe heat exchanger according to an embodiment of the present invention, and FIG. 2 is a side view thereof.
Reference numeral 1 denotes an outer spiral tube. An intermediate spiral tube 2 is disposed inside the outer spiral tube, and an inner spiral tube 3 is disposed inside the outer spiral tube. These spiral tubes form a heat transfer tube in which the inner tube and the outer tube are integrated. A double pipe, that is, an inner pipe inserted with an appropriate gap in the inner diameter space of the outer pipe. For this reason, hot water is passed through the inner pipe, and cold water is passed through a gap formed between the inner pipe outer diameter surface and the outer pipe inner diameter surface, whereby heat exchange is performed between the two, and the cold water is heated. It will be. The intermediate spiral tube 2 has the same function as the inner spiral tube 3 and can be handled as an inner spiral tube. In this case, a plurality of inner spiral tubes are disposed within the spiral inner diameter of the outer spiral tube 1. It is possible to flow cold water only through the outer spiral tube. Further, it is possible to flow cold water only through a gap formed between the outer diameter surface of the inner tube and the inner diameter surface of the outer tube. In this case, the warm drainage flows through the outer spiral tube 1.

  In the case of the present embodiment, since it is described for hot spring facilities, it is assumed to be hot drainage, but since it can be applied to other facilities, it will be described as warm water including hot drainage, but in any case the inner spiral tube The deposits in the hot water will adhere to the inner surface of the heat transfer tube 2. When the warm drainage is allowed to flow through the outer spiral tube 1, the deposits in the warm water adhere to the inner surface of the heat transfer tube of the outer spiral tube 1.

  A connecting tube group 4 consisting of connecting tubes 4a, 4b, 4c is installed at the lower end of the inner and outer windings, and a similar connecting tube group 40 is installed at the upper end of the winding. 40a is connected to the intermediate spiral tube 2 with connecting tubes 4b and 40b, and the inner spiral tube 3 is connected to connecting tubes 4c and 40c. These connecting tubes are double tubes as well as the inner and outer spiral tubes. These connecting pipes 4 and 40 and lead-out pipes 5 (5a, 5b and 5c) constitute a tangential lead-out portion 50. As shown in FIG. 1, the lead-out part 60 may be formed by the connecting pipe 40 (40a, 40b, 40c).

  The multi-arranged spiral double pipes are not connected in series, but constitute a multi-arrangement type double-pipe heat exchanger 100 having an independent structure, respectively. The ball mooring devices for mooring the cleaning balls described later are connected to the upper and lower ends, respectively.

  When the height of the outer spiral tube 1, the intermediate spiral tube 2 and the inner spiral tube 3 is the same, in order to pull out the respective warm drainage inlet side and outlet side portions upward, it is perpendicular to the spiral portion. Alternatively, the tube must be bent downward, but if the tube is bent sharply with such a small curvature, there is a problem that the cleaning balls cannot be easily passed and clogging is likely to occur.

  In order to avoid this, in the present embodiment, the outer spiral tube 1, the intermediate spiral tube 2, and the inner spiral tube 3 of the double tubes arranged in multiple layers are installed at different levels with the inner ones made higher, and the respective inlets. It is characterized in that the lower end and the upper end on the side or outlet side are drawn out in the tangential direction of the spiral winding. The connecting direction is not limited to a geometrical tangent, and even if it is a slow curved shape, the cleaning ball passes through without difficulty.

  And it is important that the pulling angle is not bent more than one turn of the outer spiral tube 1. In this embodiment, the stepped structure is used as described above, but the inner spiral tube is an outer spiral formed at both ends of the winding in the lateral direction of the both ends (lateral to the height direction). It may be formed so as to be provided with a tangential drawing portion having a structure in which the winding portion of the tube is not present, that is, the tangential drawing portion is drawn from the non-existing portion.

In the embodiment, three sets of spiral double tubes are arranged, but the present invention is not limited to this, and four sets or two sets may be used.
With the above configuration, the above-described problem is solved.

FIG. 3 is a side sectional view of the ball mooring devices 6 and 60 employed in this embodiment, and FIG. 4 is a plan sectional view thereof.
Reference numeral 61 denotes a body, in which a flange pipe 62a having a pipe hole 62b on both sides thereof and a flange pipe 63a having a pipe hole 63b are hermetically joined by welding Y1. The lower end is welded Y2 and the cover 65 is similarly airtightly joined to form a ball mooring chamber 60a in which the ball B is moored at the center. A female screw hole Mn is screwed in the upper cylindrical portion, and a dirty state observation window for the ball B can be installed by screwing to this, or a valve for replacing the dirty ball can be installed. These installation examples will be described later.

  Reference numeral 64 is a stopper for locking the ball B, and is provided so that the ball B flowing in from the tube hole 62b side does not move to the tube hole 63b side. Ball B is a so-called sponge ball (elastic ball) made of synthetic resin that has air bubbles inside and is easily deformed. Its outer diameter is slightly larger than the inner diameter of the inner pipe through which hot drainage flows. It acts to scrape dirt, which is a deposit attached to the inner wall of the inner tube through the inner tube.

FIG. 5 is a diagram for explaining the principle of ball cleaning.
One ball B is thrown into each of the inner spiral tube 1 and the outer spiral tubes 1, 2 and 3 formed in multiple. The ball B reciprocates in the inner spiral tube between the lower ball mooring device 6 and the upper ball mooring device 60 by alternately changing the inflow direction of the warm drainage flowing into the inner spiral tube at a predetermined cycle. The dirt attached to the inner wall of the inner spiral tube is scraped and moved downstream along with the hot waste water. When clean cold water flows through the outer spiral tube, the ball device may not be charged into the outer spiral tube.

  When the inner spiral tube has at least a spiral double inner spiral tube structure, an upper ball mooring device 60 and a lower ball mooring device 6 are connected to each tangential drawing portion, and formed between these ball mooring devices. The flow path of the ball B is formed independently.

FIG. 6 shows an embodiment in which a ball dirt state observation window is installed in a ball mooring device.
Reference numeral 66 denotes a window made of a transparent material, preferably an acrylic resin or a polycarbonate resin. However, the window is not limited to this material, and another material may be used. Moreover, the structure which manufactured the main body with the metal and manufactured only the window with transparent resin or glass may be sufficient. A male screw is formed in the lower narrow diameter portion and screwed into the female screw hole Mn. 67 is an elastic packing which is inserted between the upper end surface of the body 61 and the stepped portion of the window 66 to hold the ball mooring chamber 60a in an airtight manner.

  If the upper and lower surfaces of the window 66 have a convex shape, a convex lens is formed, so that the dirt state of the ball B can be enlarged and observed.

  FIG. 7 shows an embodiment in which the valve 68 is installed in the ball mooring device 6 (60). The ball mooring device 6 (60) functions as a ball throwing device and a ball discharging device.

  67 is an elastic packing which is fitted between the stepped portion of the valve body 69 and the upper end surface of the body 61 to hold the chamber 60a in an airtight manner. A vertical hole 69a having a stepped portion is formed in the center of the valve body 69, and a horizontal hole 69b is formed in the inner wall on the larger diameter side, and the size is set so that the ball B can pass through.

  70 is a valve cylinder which is closed at the top and opened at the bottom. A side hole 70a is provided in the side wall, and a groove is provided in the outer diameter portion, and an O-ring 71 is inserted therein. Match. The lateral hole 70a is set to be slightly larger than the ball B so that the ball B can pass through without difficulty. An upper portion of the valve cylinder 70 is fitted with a locking plate 74 called a C-ring in a groove provided in the upper inner diameter portion of the valve body 69 so that the valve cylinder 70 does not come out and a lever 72 is provided. The valve 68 is fixed by a screw 73, and the valve cylinder 70 constitutes a valve 68 that can be manually rotated.

  Normally, the valve 68 is in a closed state, but when the lever 72 is rotated by a predetermined angle, the valve cylinder 70 fitted in the vertical hole 69a also rotates by the same angle, and the horizontal hole 70a coincides with the same position as the horizontal hole 69b, that is, it is in an open state. Accordingly, the ball B can be discharged together with the warm drainage from the lateral hole 69b of the valve body 69. The valve 68 is not limited to the present embodiment, and it is needless to say that any structure can be adopted.

  FIG. 8 is a plan view of a hot water heater 200 using warm drainage, in which the multi-placement type double-pipe heat exchanger 100 of this embodiment is installed, and FIG. 9 is a side view thereof.

  Reference numeral 7a denotes a lower frame to which the legs 7d are joined, 7b denotes a side plate, and 7c denotes an upper plate. The multi-arrangement type double-pipe heat exchanger 100 is fixed and placed on the lower frame 7a. The lower ball anchoring device 6 is connected to the inner spiral tube of the lower connecting tube group 4, and the upper ball anchoring device 60 is connected to the inner spiral tube of the upper connecting tube group 40.

  Further, a flange pipe 9a is connected to the outer spiral pipe of the lower connecting pipe group 4, and a flange pipe 9b is connected to the outer spiral pipe of the upper connecting pipe group 40, and the cold water taken from the flange pipe 9a is a multiple arrangement type. It passes through the outer spiral tube of the double tube heat exchanger 100, is heated by heat exchange, and is sent out from the flange tube 9b. The cold water flowing in these flange pipes controls the water flow and water stoppage by the valve 80.

  The warm drainage flows from the flange pipe 9d, passes through the three-way valve 10b, the warm drainage header 11b, the upper ball mooring device 60, and passes through the inner spiral pipe of the multi-placement double pipe heat exchanger 100. After passing, it is guided to the discharge flange pipe 9c through the pipe 12 via the lower ball mooring device 6, the hot drainage header (hot water header) 11a, and the three-way valve 10a.

  After a predetermined time has elapsed, the three-way valve is switched and controlled so that the warm drainage flowing from the flange pipe 9d enters from the three-way valve 10a and the warm drainage header 11a side, and the multiple arrangement type double pipe via the lower ball mooring device 6 It passes through the inner spiral tube of the heat exchanger 100 and is discharged from the warm drainage header 11b to the three-way valve 10b and the flange tube 9c via the upper ball mooring device 60.

  Therefore, by controlling the flow direction of the hot waste water, as described above, the cleaning ball B reciprocates without any stagnation in the inner spiral tube of the multi-placement type double tube heat exchanger 100, and the heat transfer tube The side walls can be cleaned automatically.

  A control panel 8 includes a control circuit, various switches, meters, indicator lights, and the like, and starts and stops the operation of the hot water heater by hot waste water, switching control of the above-described three-way valves 10a and 10b, and control state Is displayed.

  FIG. 10 shows another embodiment of the present invention. It is a top view of the heating water heater 200 which has arrange | positioned many multiple arrangement | positioning type | mold double pipe type heat exchangers 100. FIG.

The same configurations as those in the first embodiment are denoted by the same reference numerals, and the description of the first embodiment is used for the description.
Multi-placement type double-pipe heat exchanger 100 is increased according to the amount of hot and cold water (3 in the figure), and optimal multi-position type double-pipe heat exchangers are installed in a wide range of hot spring facilities. A heated water heater can be provided. Further, the three-way valves 10a and 10b and the warm drainage headers 11a and 11b are made common from the warm drainage flanges 9c and 9d by aligning the portions drawn in the tangential direction of the spiral winding in the same direction in each unit. The feature is that the device mechanism has been simplified.

  FIG. 11 is a plan view of a heating water heater 200 in which a large number of multiple arrangement type double pipe heat exchangers 100 according to another embodiment of the present invention are arranged.

  On the side of FIG. 10, the hot water guide / drain region and the arrangement region of the multi-placement double pipe heat exchanger 100 are linear in the longitudinal direction, but on the side of FIG. They are juxtaposed and the other one is in a series arrangement.

The top view of the multi-arrangement type double tube type heat exchanger by the example of the present invention. The side view of FIG. Side surface sectional drawing of a ball mooring apparatus. FIG. 4 is a plan sectional view of FIG. 3. The principle explanatory view of ball washing. Side surface sectional drawing which shows the Example which installed the dirt state observation window of the ball | bowl in the ball mooring apparatus. Side surface sectional drawing which shows the Example which installed the valve | bulb in the ball mooring apparatus. The top view of the heating water heater which installed the multi-arrangement type double pipe type heat exchanger. The side view of FIG. The top view of the heating water heater which installed the other multiple arrangement type double pipe type heat exchanger. The top view of the heating water heater which installed the other multiple arrangement type double pipe type heat exchanger.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Outer spiral tube, 2 ... Intermediate spiral tube, 3 ... Inner spiral tube, 4 ... Lower side connection tube group, 40 ... Upper side connection tube group, 6 ... Lower side ball mooring apparatus, 11a ... Hot drainage (warm water) header, 60 ... Upper ball mooring device, 60a ... Ball mooring chamber, 62a ... First flange tube, 63a ... Second flange tube, 64 ... Stopper, 66 ... Observation window, 68 ... Valve, B ... Ball, 100 ... Multiple arrangement Type double tube heat exchanger, 200 ... heating water heater.

Claims (7)

An inner spiral tube through which warm water passes and deposits in the warm water adhere is arranged with a predetermined gap within the spiral inner diameter of the outer spiral tube to constitute at least a spiral double heat transfer tube, and the heat transfer tube is connected to the inner spiral tube. In the multi-placement type double-pipe heat exchanger in which an elastic ball for cleaning the inner surface is charged,
The inner spiral tube has a tangential lead-out portion with a structure in which the inner spiral tube is drawn tangentially from the non-existing portion of the winding portion of the outer spiral tube formed in the lateral direction of the both end portions. A multi-arrangement type double-pipe heat exchanger.   2. The inner spiral tube according to claim 1, wherein the inner spiral tube is arranged in a height difference with respect to the outer spiral tube, thereby forming a non-existing portion of the winding portion of the outer spiral tube. A multi-placement double tube heat exchanger characterized by   3. The inner spiral tube according to claim 1, wherein the inner spiral tube has at least a spiral double inner spiral tube structure, and an upper ball mooring device and a lower ball mooring device are connected to the tangential lead portions, respectively. A multi-placement double-pipe heat exchanger characterized in that the flow path of the elastic ball for cleaning the inner surface of the heat transfer tube of each inner spiral tube disposed between the ball mooring devices is formed independently. .   4. The method according to claim 1, wherein one or both of the upper ball mooring device and the lower ball mooring device are connected to the inner spiral tube and the outer spiral tube, respectively, and a hot water intake device. A multi-placement type double comprising a second flange tube, a ball mooring chamber, an observation window, and a stopper for locking movement of the elastic ball to the second flange tube Tube heat exchanger.   4. The multi-placement double pipe heat exchanger according to claim 3, wherein either or both of the upper ball mooring device and the lower ball mooring device include a valve for charging and discharging the elastic ball.   A multi-placement double pipe heat exchanger according to any one of claims 3 to 5, comprising two three-way valves for switching the flow of hot water, one three-way valve, the upper ball mooring device, and the other A heating water heater comprising a pipe connecting a three-way valve and the lower ball mooring device. In claim 6, a plurality of multi-placement type double tube heat converters are juxtaposed, and each of the tangential lead portions is aligned in the same direction, and is common to each upper ball mooring device and lower ball mooring device. A hot water heater provided with a hot water header.

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