JP2013170712A - Heat collector for solar water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat collector for solar water heater which is easy to manufacture and is stackable.SOLUTION: A heat collector 13 for solar water heater includes: a heat collection plate 21 having a flow path 25 for heat medium formed by joining two plates 23; a square heat collector case 19 having a bottom plate 65, in which the heat collection plate 21 is housed in parallel to the bottom plate 65; a laterally opened recess 67 which is formed by denting the bottom plate 65 upward at a corner 27 of the heat collector case 19; and an inlet/outlet pipe 29 having an inlet/outlet pipe upper end 76 connected to the lower plate 23 in communication with the flow path 25 and an inlet/outlet pipe lower end 77 led to the recess 67 through the bottom plate 71.

Description

  The present invention relates to a collector of a solar water heater in which a collector plate is accommodated in a collector case.

  A solar water heater generally includes a heat collector that collects solar heat, a hot water storage tank that can store the heat, and a heat medium piping system that circulates the heat medium therebetween. The solar heat collected by the heat collector is carried to the hot water storage tank by the heat medium passing through the heat medium piping system. A heat exchanger connected to the heat medium piping system is provided in the hot water storage tank, and hot water is stored. In the hot water tank, the heat of the heat medium is transferred to hot water by the heat exchanger and stored.

The solar water heater 500 shown in FIG. 7 is of a type in which a hot water storage tank 515 is disposed above two attached heat collectors 519, and the space between the heat collector 519 and the hot water storage tank 515 is not shown. The heat medium is forcibly circulated by the heat medium circulation system to exchange heat with the water in the hot water storage tank 515. In addition, a solar water heater of a type in which a heat collector is separated from a hot water tank, the heat collector is installed on a roof, and the hot water tank is installed in another space is generally used.
Here, as the collector of the solar water heater, a tubular collector or a plate collector is generally used. The plate type heat collector has an advantage that the structure can be simplified and the weight can be reduced as compared with the tubular heat collector.

  The heat collector 519 shown in FIG. 7 and FIG. 8 forms one or both of the two plates 503 in a corrugated shape, and heats the two plates 503 by bonding them together. It is a plate type heat collector having a heat collecting plate 501 having a flow path through which a medium passes. A metal material having good thermal conductivity is used for the plate 503 constituting the heat collecting plate 501 (see, for example, Patent Document 1). A transparent plate 511 is attached to the upper surface side of the heat collector case 513 that accommodates the heat collecting plate 501.

The heat collecting plate 501 is provided with inlet / outlet pipes 505 (connecting pipes) at least at two places communicating with the heat medium circulation pipe at the upstream end and the downstream end of the flow path (normally as shown in FIG. 7). In consideration of the versatility of the heat collector 519, the inlet / outlet pipes 505 are attached to the four corners of the heat collecting plate 501).
As shown in FIG. 8, in the heat collecting plate 501 accommodated in the heat collector case 513, the inlet / outlet pipes 505 attached to the four corners are led out through the side openings 514 of the heat collector case 513. . Conventionally, in order to connect the inlet / outlet pipe 505 to the heat collecting plate 501, the inlet / outlet pipe 505 is inserted into the flow passage opening 509 of the plate edge 507 formed by bonding the plates 503, and these are welded or brazed. Was joined by.

JP 2003-262402 A

However, in order to insert the inlet / outlet pipe 505 into the flow path opening 509 formed in the plate edge 507 and join them together, the gap between the flow path opening 509 of the plate edge 507 and the outer periphery of the inlet / outlet pipe 505 is used. It is necessary to close the gap portion 520 by welding or brazing, and such welding or brazing work requires the skill of the operator and is disadvantageous in improving productivity.
The inlet / outlet pipes 505 are each led out from the side surface of the collector case 513. When a plurality of the collectors 519 are arranged in the horizontal direction, the inlet / outlet pipes 505 are attached to connect adjacent inlet / outlet pipes 505 with a pipe joint or the like. There was a problem that a gap had to be secured between the heat collectors 519 and the length of juxtaposition was increased.
On the other hand, it is conceivable to lead out the inlet / outlet pipe 505 from the lower surface side of the heat collector case 513 containing the heat collecting plate 501. However, if the inlet / outlet pipe 505 protrudes from the lower surface of the heat collector 519, the heat collector 519 cannot be directly stacked during transportation or storage, and a spacer member for loading is necessary, There is a problem in that the heat medium circulation conduit has to be routed on the bottom side of the case 513, and the height of attachment to the roof becomes high.

  This invention is made | formed in view of the said condition, The objective is to provide the collector of the solar water heater which is easy to manufacture and is stacked.

The above object of the present invention is achieved by the following configuration.
(1) A heat collecting plate in which two plates are joined to form a flow path for a heat medium, a quadrangular heat collecting case in which the heat collecting plate is accommodated in parallel to the bottom plate, and the heat collecting device The bottom plate in at least one pair of diagonal corners of the case is recessed upward and opened laterally, and one end opening communicates with the flow path and is connected to the lower plate and the other end opening. A solar heat collector, wherein the portion includes an inlet / outlet pipe penetrating the bottom plate of the concave portion and led out to the concave portion.

According to the collector of the solar water heater having the configuration of (1) above, a recess having a recessed bottom plate is formed at the corner of the collector case, and the bottom of the collector plate housed in the collector case is formed. An inlet / outlet pipe whose one end opening is connected to the side plate passes through the bottom plate of the recess and is disposed in the recess. Therefore, the other end opening of the inlet / outlet pipe does not protrude downward from the bottom plate of the heat collector case. As a result, when a plurality of heat collectors are stacked, the inlet / outlet pipes do not interfere with the lower-layer heat collector and can be stacked and stored.
Further, the one end opening of the inlet / outlet pipe can be joined to the lower plate of the heat collecting plate by welding or brazing in the vertical direction and connected to the flow path of the heat medium. Thereby, an easy welding or brazing operation with a simple structure in which the circular one end opening portion of the inlet / outlet pipe is inserted into the circular brazing opening portion opened in the lower plate is possible.

(2) The solar water heater of the configuration of (1), wherein the inlet / outlet pipe is formed in a straight short tube penetrating through the bottom plate of the recess, and the other end opening of the inlet / outlet pipe Is connected to a vertical pipe portion of an L-shaped tube housed in the concave portion.

  According to the solar water heater of (2) above, the other end opening of the inlet / outlet pipe penetrating through the bottom plate of the recess is disposed in the recess, and the other end opening is accommodated in the recess. Connected to the vertical tube section of the L-shaped tube. In the L-shaped tube, a horizontal tube portion connected perpendicularly to the vertical tube portion is extended in parallel with the heat collecting plate in the concave portion. As a result, the horizontal tube portion of the L-shaped tube connected to the inlet / outlet tube can be led out of the heat collector from the open portion of the recess that opens to the side of the heat collector case, and other heat collectors and Connection with a heat exchanger becomes easy.

(3) The solar water heater of the configuration of (2) above, wherein the L-shaped tube is a flat shape in which a base end side of a horizontal tube portion connected orthogonally to the vertical tube portion is crushed up and down A collector of a solar water heater, characterized in that it is formed of a tube and is formed of a circular tube eccentric to the bottom plate side of the recess with respect to the flat tube.

  According to the collector of the solar water heater having the configuration of (3) above, the base end side of the horizontal tube portion of the L-shaped tube disposed below the other end opening of the entrance / exit tube is a flat tube. Compared with the case where the base end side is a circular tube, the height in the height direction of the concave portion can be lowered by the amount of being crushed. As a result, the L-shaped tube can be led out from the side of the collector case by changing the direction of the horizontal tube connected to the vertical tube in the orthogonal direction within the recess having a low height. It becomes.

(4) The solar collector of any one of the configurations (1) to (3) above, wherein the concave portion is arranged along the lower side and the upper side of the collector case. A solar water heater collector formed by denting the bottom plate of the vessel case.

  According to the collector of the solar water heater having the configuration of the above (4), the concave portion in which the bottom plate of the collector case is recessed is formed along the lower and upper sides of the collector case. Then, the recessed part formed along the lower side part and upper side part of a collector case can be utilized also as other piping and the wiring space for wiring other than the space for connecting an entrance / exit pipe | tube. Thereby, the heat collector can perform a good-looking construction and the construction quality is improved.

  The solar water heater according to the present invention is easy to manufacture and can be stacked during transportation and storage.

  The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

It is a whole perspective view of a solar water heater provided with the heat collector which concerns on 1st Embodiment of this invention. It is a principal part expansion perspective view of the corner part in the heat collector shown in FIG. FIG. 3 is a sectional view taken along the line III-III for explaining the connection structure of the inlet / outlet pipe at the corner shown in FIG. 2. It is the front view which looked at the L-shaped tube shown in FIG. 3 from the circular tube side. FIG. 4 is an overall perspective view of the L-shaped tube shown in FIG. 3. It is a whole perspective view of the heat collector which concerns on 2nd Embodiment of this invention. It is a whole perspective view of a solar water heater provided with the conventional heat collector. It is a partially broken enlarged perspective view of the corner in the heat collector shown in FIG.

Embodiments according to the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the solar water heater 11 according to the first embodiment of the present invention is configured as a forced circulation / heat exchange type in which a heat medium is forcedly circulated to exchange heat. The solar water heater 11 is roughly divided into a heat collector 13, a hot water tank 15, and a heat medium circulation pipeline system 17. The heat collector 13 accommodates a heat collecting plate 21 in a heat collector case 19. As shown in FIG. 3, the heat collecting plate 21 is a kind of so-called plate-type heat collector in which two plates 23 are joined to form a heat medium passage 25.

  The heat collector 13 has, for example, a rectangular shape, and has a heat collector area of about 2 square meters, which is 2 m in length (roof flow direction), 1 m in width (direction along the purlin), and 60 mm in thickness. The heat collector 13 is installed on the roof surface in a direction in which the flow path 25 is on the longitudinal side, and a plurality of heat collectors 13 are generally used side by side. In the present embodiment, two heat collectors 13 are connected and provided side by side.

  The upper surface of the heat collector case 19 that houses the heat collecting plate 21 is closed by a transparent plate 26 that is a transparent body. For the heat collector case 19, for example, a coated hot-dip zinc-5% aluminum alloy plated steel plate is used. For the heat collecting plate 21, an extremely low carbon ferritic stainless steel can be suitably used. The surface of the heat collecting plate 21 is subjected to a selective absorption surface treatment to increase the heat collecting efficiency. In the heat collecting plate 21, an inlet / outlet pipe 29 (see FIGS. 3 and 4) described later is connected to four corners 27, and the inlet / outlet pipe 29 communicates with the flow path 25. In the present embodiment, the inlet / outlet pipes 29 are provided at the four corners of the heat collecting plate 21 and can be taken out in four directions. In actual construction, one of the four inlet / outlet pipes 29 is closed and the remaining three are used. As the piping size of the entrance / exit pipe 29, for example, one having a diameter of about 12.7 is used.

  The hot water storage tank 15 is configured by accommodating a main body 33 in a hot water storage tank case 31 and installed on the roof above the heat collector 13. For the hot water tank case 31, for example, a coated hot-dip zinc-5% aluminum alloy plated steel plate is used. Stainless steel is used for the tank body 33. The tank body 33 is a sealed type directly connected to a water supply, and has a hot water storage capacity of about 200 liters. A heat exchanger 35 made of stainless steel is installed inside the tank body 33, and the heat exchanger 35 is connected to the heat medium circulation pipeline 17. The hot water storage tank 15 passes the heat medium heated by the heat collector 13 through the heat exchanger 35 to heat the water, and stores the heated water as hot water.

  A water supply port 37 for supplying water, a drain port 39 for draining water from the tank main body 33, and a hot water supply port 41 are connected to the tank body 33, and these are led out from the hot water tank case 31. The drain port 39 is normally closed by a drain valve provided in a drain pipe (not shown) to be connected, and is opened only when water is drained from the tank body 33. By connecting the water pipe to the water supply port 37, the water supplied to the tank body 33 is taken out from the hot water supply port 41 as hot water by the heat exchanger 35 provided inside.

  The heat medium circulation line system 17 of the first embodiment includes a connection forward pipe 43, a connection hose 45, a connection return pipe 47, a cistern 49, a heat collection pump 51, a solar battery 53, and a relief valve 55. And a vacuum breaker 57 and a float switch 59.

  One end of the connecting pipe 43 is connected to the heat collecting pump 51, and the other end of the connecting pipe 43 is connected to an inlet / outlet pipe 29 (see FIG. 4), which is the water injection side of the upstream heat collector 13 (right side in FIG. 1). Connection is made via a pipe 61. The connecting hose 45 connects adjacent inlet / outlet pipes 29 of the upstream heat collector 13 and the downstream heat collector 13 (left side in FIG. 1). One end of the connection return pipe 47 is connected to the inlet / outlet pipe 29, which is the drain side of the downstream heat collector 13, via the L-shaped pipe 61, and the other end is connected to the heat exchanger 35. The cistern 49 is provided between the heat exchanger 35 and the heat collecting pump 51 and temporarily stores the heat medium from the hot water tank 15. The cistern 49 is provided with a filling opening (not shown) for filling the heating medium. A drain hose is provided below the filling opening to allow excess expanded heat medium to overflow.

  The heat collection pump 51 is provided between the cistern 49 and the connection forward pipe 43, and pressurizes and conveys the heat medium from the cistern 49, thereby transferring the heat medium to the heat collector 13, the heat exchanger 35, and the cistern 49. Cycle in order. The solar cell 53 is used as a power source for the heat collecting pump 51. The heat collection pump 51 is automatically operated by the power generation of the solar cell 53 when there is solar radiation. In the present embodiment, an antifreeze mainly composed of propylene glycol is used as the heat medium from the viewpoint of safety.

  The relief valve 55 is provided between the tank body 33 and the hot water supply port 41, and opens when the internal pressure of the tank body 33 exceeds a predetermined value, and works to allow the hot water to escape. The relief valve 55 also serves as a discharge port for water supplied from the water supply port 37 after the tank body 33 is full. The vacuum breaker 57 is installed when the hot water supply place is at a position lower than the hot water storage tank 15, and prevents the dent due to the negative pressure of the tank in the hot water supply pipe by opening the hot water supply pipe system to the atmosphere. The float switch 59 is provided at the bottom of the cis-turn 49 and operates when the heat medium (that is, the total amount of the heat medium) of the cis-turn 49 is equal to or less than a certain amount, thereby preventing idling of the heat collecting pump 51.

As shown in FIG. 1, the heat collector case 19 of the present embodiment is formed in a rectangular shape such as the rectangular shape described above, and accommodates the heat collecting plate 21 in parallel with the bottom plate 65.
As shown in FIG. 2, concave portions 67 are formed in the four corner portions 27 of the heat collector case 19, respectively. In the concave portion 67 of the first embodiment, the two side portions that intersect with the bottom plate 65 at each corner portion 27 are opened upward as the open portions 103. That is, this recessed part 67 forms the space | gap 69 between roofs (refer FIG. 3) between the roof surfaces when the heat collector 13 is installed in a roof.

  As shown in FIG. 3, inlet / outlet pipes 29 are provided at the four corners of the heat collecting plate 21 corresponding to the positions of the recesses 67. The inlet / outlet pipe 29 is connected to the flow path 25 by connecting the upper / lower end pipe (one end opening) 76 to the lower plate 23 by welding or brazing. The bottom plate 71 of the recess 67 of the heat collector case 19 is formed with an inlet / outlet pipe through opening 73 through which the inlet / outlet pipe 29 penetrates. An inlet / outlet pipe lower end (other end opening) 77 of the inlet / outlet pipe 29 depending from the heat collecting plate 21 passes through the bottom pipe 71 through the inlet / outlet pipe through opening 73 and is led out to the recess 67. The entrance / exit pipe 29 and the entrance / exit pipe through opening 73 are closed by a closing member 75 made of rubber or the like. A flange portion 79 protruding outward in the radial direction is formed at the lower end 77 of the entrance / exit pipe penetrating the closing member 75.

  The entrance / exit pipe 29 is formed in a straight short tube penetrating through the bottom plate 71 of the recess 67. The inlet / outlet pipe lower end 77 is connected to the vertical pipe portion 81 of the L-shaped pipe 61 accommodated in the recess 67. A circumferential groove 83 is formed on the distal end side of the vertical pipe portion 81, and an O-ring 85 is attached to the outer periphery of the circumferential groove 83. The O-ring 85 provides a watertight seal between the outer peripheral surface of the vertical pipe portion 81 inserted from the inlet / outlet pipe lower end 77 and the inner peripheral surface of the inlet / outlet pipe 29.

  The inlet / outlet pipe 29 and the vertical pipe portion 81 of the L-shaped pipe 61 connected in a watertight state via the O-ring 85 are sandwiched and fixed by a quick fastener 63. The quick fastener 63 has a substantially C-shaped cross-sectional shape in which a slit 87 is formed along the circumferential direction. The quick fastener 63 sandwiches and fixes the flange portion 79 of the inlet / outlet pipe 29 and the pressing step portion 89 of the vertical pipe portion 81 via the slit 87.

As shown in FIGS. 3 to 5, the L-shaped tube 61 is formed of a flat tube 93 whose base end side of a horizontal tube portion 91 connected orthogonally to the vertical tube portion 81 is crushed up and down. The vertical tube portion 81 and the flat tube 93 are connected by brazing. The open end (left end in FIG. 3) of the flat tube 93 is closed by a brazed copper plug 86.
The front end side of the horizontal tube portion 91 is formed by a circular tube 95 that is eccentric to the flat plate 93 toward the bottom plate 71 side of the recess 67. As shown in FIG. 3, the bottom of the flat tube 93 is disposed at a position slightly inside (upper side in the drawing) of the bottom plate 65 of the heat collector case 19. The circular tube 95 is bent and eccentric in a crank shape so that the bottom is located inward of the bottom of the flat tube 93. That is, between the flat tube 93 and the circular tube 95, a cross-sectional shape is a bent joint portion 94 that is deformed from an elliptical shape to a circular shape without a step. Therefore, the L-shaped tube 61 is accommodated in the inter-roof space 69 without interfering with the roof.
Here, the tip of the circular tube 95 does not protrude from the side of the heat collector case 19. A pipe joint 99 in which a pipe screw 97 is formed is brazed to the tip of the circular pipe 95, and this pipe joint 99 slightly protrudes from the side of the heat collector case 19. In addition, the piping joint brazed to the front-end | tip of the circular pipe | tube 95 can select various piping joints according to the kind of the other party piping, a hose, etc. to be connected.

  The L-shaped pipes 61 connected to the inlet / outlet pipes 29 are connected to different mating pipes at the positions of the respective recesses 67 or are closed by caps 98. For example, the upper right L-shaped tube 61 (not shown) of the right heat collector 13 and the lower left L-shaped tube 61 (not shown) of the left heat collector 13 shown in FIG. 99 is closed by a cap 98 attached to 99. The lower right L-shaped pipe 61 of the right heat collector 13 is connected to the connection forward pipe 43 via a pipe joint 99. The left and upper L-shaped tubes 61 of the right heat collector 13 and the right and upper L-shaped tubes 61 of the left heat collector 13 are connected by a connecting hose 45. The upper left L-shaped tube 61 of the left heat collector 13 is connected to the connection return pipe 47 through a pipe joint 99.

Next, the effect | action of the heat collector 13 of the solar water heater 11 which has the said structure is demonstrated.
In the solar water heater 11 of the present embodiment, when solar radiation hits the heat collector 13, the heat medium of the heat collector 13 is heated. At the same time, the solar cell 53 supplies power to the heat collecting pump 51 by being exposed to solar radiation. As a result, the heat collection pump 51 rotates, and the heat medium is forcibly circulated to the connection forward pipe 43, the heat collector 13, the connection return pipe 47, the heat exchanger 35, the cistern 49, and the heat collection pump 51. As a result, heat is given to the water stored in the hot water storage tank 15 via the heat exchanger 35.

  On the other hand, when the solar radiation is lost, the heat collecting pump 51 is not supplied with power from the solar battery 53 and stops. Thereby, heat collection stops and heat is not radiated from the heat collector 13. Moreover, in this solar water heater 11, since the heat collection circuit in which the heat medium circulates and the hot water storage circuit that stores hot water serving as the heat storage medium are separated, the heat medium and the heat storage medium do not mix, so It is hygienic compared to the circulating type.

And in the heat collector 13 of the solar water heater 11, the recessed part 67 which recessed the bottom plate 65 in the corner part 27 of the heat collector case 19 is formed. The inlet / outlet pipe 29 having the inlet / outlet pipe upper end 76 connected to the lower plate 23 of the heat collecting plate 21 housed in the heat collector case 19 passes through the bottom plate 71 of the concave portion 67 and is disposed in the concave portion 67. Therefore, the inlet / outlet pipe lower end 77 of the inlet / outlet pipe 29 does not protrude below the bottom plate 65 of the heat collector case 19. Thereby, when a plurality of the heat collectors 13 are stacked, the inlet / outlet pipe 29 does not interfere with the lower-layer heat collector 13 and can be stacked and stored.
In addition, the inlet / outlet pipe upper end 76 of the inlet / outlet pipe 29 can be joined to the plate 23 on the lower side of the heat collecting plate 21 by welding or brazing in the vertical direction and connected to the flow path 25 of the heat medium. This facilitates easy welding or soldering with a simple structure in which the circular inlet / outlet pipe upper end 76 of the inlet / outlet pipe 29 is inserted into the circular welding or brazing opening 101 (see FIG. 3) opened in the lower plate 23. Attaching work becomes possible.

  In addition, an inlet / outlet pipe lower end 77 of the inlet / outlet pipe 29 penetrating through the bottom plate 71 of the recess 67 is disposed in the recess 67, and the inlet / outlet pipe lower end 77 is formed on the vertical pipe portion 81 of the L-shaped pipe 61 accommodated in the recess 67. Connected. In the L-shaped tube 61, a horizontal tube portion 91 connected orthogonally to the vertical tube portion 81 extends in a recess 67 in parallel with the heat collecting plate 21. Thereby, the horizontal pipe part 91 of the L-shaped pipe 61 connected to the inlet / outlet pipe 29 is removed from the open part 103 (see FIG. 3) of the concave part 67 opened on the side of the heat collector case 19 to the outside of the heat collector 13. It becomes possible to lead to the other side, and the connection with the other heat collector 13 and the heat exchanger 35 becomes easy.

  Further, since the base end side of the horizontal pipe portion 91 of the L-shaped pipe 61 arranged below the entrance / exit pipe lower end 77 of the entrance / exit pipe 29 is a flat tube 93, compared to the case where the base end side is a circular pipe. The height in the height direction of the concave portion 67 can be lowered by the amount of being crushed. Thereby, the L-shaped pipe 61 changes the direction of the horizontal pipe part 91 connected to the vertical pipe part 81 in the orthogonal direction in the gap 69 between the roofs of the recessed part 67 with a low height, and the tip side is a heat collector. It is possible to derive from the side of the case 19. As a result, the tip of the horizontal tube portion 91 of the L-shaped tube 61 hardly protrudes from the side of the heat collector case 19, and the adjacent L-shaped tubes are arranged when the plurality of heat collectors 13 are arranged in the horizontal direction. In order to connect the 61 horizontal pipe portions 91 with pipe joints, hoses, etc., the mounting gap that must be secured between the heat collectors 13 can be narrowed, and the juxtaposed length can be reduced.

  In the first embodiment, the bottom plate 65 at the four corners of the heat collector case 19 is recessed upward and the recesses 67 are opened at the sides. This is because the inlet / outlet pipes 29 are provided at the four corners of the heat collecting plate 21 in consideration of the versatility of the heat collector 13. The heat collector of the present invention is not limited to this, and it is sufficient that the recesses 67 are formed at least in the pair of diagonal corners 27.

FIG. 6 is an overall perspective view of the heat collector 107 according to the second embodiment of the present invention. In addition, about the structural member similar to the heat collector 13 of the said 1st Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.
As shown in FIG. 6, the heat collector 107 according to the second embodiment houses a heat collector plate 21 (not shown) in a heat collector case 109. For example, the two heat collectors 107 are connected to the roof surface and connected to a hot water storage tank (not shown) installed in another space such as under the eaves via a connection forward pipe 43 and a connection return pipe 47. .

  The heat collector 107 has a recess 105 formed on the bottom surface along the lower side 111 and the upper side 113 of the heat collector case 109. In the concave portion 105 of the second embodiment, the bottom plate 65 in the vicinity of the lower side portion 111 and the upper side portion 113 is recessed upward, and each side intersecting with the lower side portion 111 and the upper side portion 113 opens as an opening portion 106. ing. That is, these concave portions 105 form an inter-roof gap between the roof surface and the heat collector 107 installed on the roof.

Inlet / outlet pipes 29 are provided at four corners of the heat collecting plate 21 (not shown) corresponding to the position of the recess 105. An L-shaped pipe 61 is connected to the inlet / outlet pipe 29, and a pipe joint 99 projects from the left and right sides of the heat collector case 109.
The right upper L-shaped tube 61 of the right heat collector 107 and the lower left L-shaped tube 61 of the left heat collector 107 shown in FIG. 6 are closed by a cap 98 attached to the pipe joint 99. The lower right L-shaped pipe 61 of the right heat collector 107 is connected to the connection forward pipe 43 via a pipe joint 99. The left and upper L-shaped tubes 61 of the right heat collector 107 and the right and upper L-shaped tubes 61 of the left heat collector 107 are connected by a connecting hose 96. The upper left L-shaped tube 61 of the left heat collector 107 is connected to the connection return pipe 47 via a pipe joint 99.
Here, the connection return pipe 47 is routed in the recess 105 formed along the upper side 113 and is connected to a heat exchanger (not shown) together with the connection forward pipe 43 that joins at the upper right of the right heat collector 107. The

  That is, according to the heat collector 107 of the second embodiment, in addition to the same effect as the heat collector 13 of the first embodiment, the concave portion 105 can be used as another piping or wiring arrangement space. Be available. Thereby, piping and wiring can be routed in the recess 105, and the heat collector 107 can perform a good-looking construction and improve the construction quality.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

DESCRIPTION OF SYMBOLS 11 ... Solar water heater 13 ... Heat collector 19 ... Heat collector case 21 ... Heat collecting plate 23 ... Plate 25 ... Flow path 27 ... Corner 29 ... Entrance / exit pipe 61 ... L-shaped pipe 65 ... Bottom plate 67 ... Recess 71 ... Bottom plate 76 ... upper end of entrance / exit pipe (one end opening)
77 ... lower end of inlet / outlet pipe (opening at the other end)
81 ... Vertical pipe part 91 ... Horizontal pipe part 93 ... Flat pipe 95 ... Round pipe

Claims (4)

A heat collecting plate in which two plates are joined to form a heat medium flow path;
A quadrangular heat collector case having a bottom plate and accommodating the heat collecting plate in parallel with the bottom plate;
A concave portion in which the bottom plate at the pair of corners in the diagonal direction of the heat collector case is recessed upward and the side is opened;
One end opening communicates with the flow path and is connected to the lower plate, and the other end opening penetrates the bottom plate of the recess and is led to the recess,
A solar water heater heat collector characterized by comprising: The entrance / exit pipe is formed in a straight short tube penetrating through the bottom plate of the recess,
The collector of the solar water heater according to claim 1, wherein the other end opening of the inlet / outlet pipe is connected to a vertical pipe portion of an L-shaped tube accommodated in the recess.   The L-shaped tube is formed of a flat tube in which a base end side of a horizontal tube portion connected perpendicularly to the vertical tube portion is crushed up and down, and a distal end side of the horizontal tube portion is recessed with respect to the flat tube. The solar collector according to claim 2, wherein the collector is formed of a circular tube eccentric to the bottom plate side of the solar water heater.   The said recessed part is formed by denting the bottom plate of the said collector case along the lower side part and upper side part of the said collector case, The any one of Claims 1-3 characterized by the above-mentioned. A solar water heater collector described in 1.

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