WO2009130983A1 - Hot water circulating electric heater - Google Patents

Abstract

A hot water circulating electric heater for indoor use, wherein a hot water circulating panel is mounted on and connected to a heater unit box in which a circulating function section is compactly contained, heated hot water is forcibly circulated to heat a heat dissipating panel without temperature irregularity, and the heat dissipating panel heats a space by natural convection. A heating and circulating function section is formed by interconnecting through piping a water supply fitting (7), an air separating pressure tank (2), a circulating pump (3), and a pipe heater (4). The heating and circulating function section is compactly containedin a heater unit box (1). A heat dissipating section (8) formed by suspending and supporting water circulating and heat dissipating panels (81, 82) by a frame member is integrally mounted on the heater unit box (1).

Description

Electric hot water circulation heater

The present invention is a heater for use in room heating, and is a movable electric hot water circulation heater in which an exposed heat radiating panel is integrated on a heater unit box so as to be movable on the floor.

An electric hot water heater in which a heat dissipating part and a heating part are integrated is already known from Conventional Example 1 shown in FIG. 11, Conventional Example 2 shown in FIG.
Conventional example 1 is disclosed in Patent Document 1, and as shown in FIG. 11, a large number of radiating fins 106 are circumferentially fixed to the outer peripheral surface of a heating copper tube 101 arranged in a straight line, In addition, a sheathed heater 104 is disposed in the heating chamber 103 inside the heating copper tube 101 over almost the entire length of the heating copper tube 101, and the heating chamber 103 is filled with an aqueous solution and folded from the heating copper tube 101. An expansion gas is filled in an expansion chamber copper tube 107 disposed horizontally via a curved tube portion 105, and a pressure safety valve 109 is disposed at the tip of the expansion chamber horizontal tube portion 108.

Then, under the control of the thermostat 110, the aqueous solution in the heating chamber 103 is heated via the sheathed heater 104, and the radiating fin 106 is heated by natural convection heat conduction of the heated aqueous solution. This is an electric hot water heater that warms indoor air by a method, and the whole heater 100 is miniaturized, and a small amount of aqueous solution in the heating chamber 103 is heated in a short time to heat the radiating fins 106 in a short time, thereby radiating heat. This is a heater in which the initial rise of this is accelerated, and the heat radiating portion and the heating portion are housed in the case Ca.

Conventional example 2 is disclosed in Patent Document 2, and as shown in FIG. 12, an upper portion of a U-shaped copper first pipe 201 is an expansion chamber 202, and a tear-off circle is formed at the tip of the expansion chamber 202. The safety valve 209 is disposed via the plate 207, the sheathed heater 204 is disposed at the large diameter portion of the lower portion of the first tube 201, and the second tube 205 is disposed in parallel from the middle between the upper portion and the lower portion of the first tube 201. Then, both ends of the second pipe 205 are connected to the first pipe 201, filled with an aqueous solution to form a circulation path, and a group of fins 206 is arranged on the outer periphery of the second pipe 205, and heated filling water is placed in the circulation path. Naturally convection circulated, under the control of a thermostat 210 disposed in the case body Ca, a heating unit and a heat radiating unit that naturally dissipate heating convection from the fins 206 group through the heating circulation water are integrated. Housed electric water heater 00 is.
Japanese Utility Model Publication No. 6-18813 JP 55-49635 A

In the heater of Conventional Example 1 (FIG. 11), the aqueous solution in the heating chamber 103 is heated by the sheathed heater 104, and the copper tube constituting the heating chamber 103 transfers heat to the radiating fin 106 on the outer periphery of the copper tube. The heat transfer from the heating aqueous solution to the radiating fin 106 is the heat transfer from the heating steel pipe 101, and temperature spots are likely to occur in the radiating fin 106 group.
Further, since the amount of the aqueous solution in the heating chamber 103 is small, operation and stop by the thermostat 110 frequently occur, and the heat generation effect corresponding to power consumption is small.
In addition, the heating method from the radiator (radiation fin) is a natural convection method that utilizes the natural air flow from the radiator, and provides gentle heating that is gentle to the body. Since the fin group) is housed in the case Ca, the radiant heat heating effect is also small.

The heater of Conventional Example 2 (FIG. 12) does not circulate a heated aqueous solution between the first pipe 201 provided with the lower sheathed heater 204 and the intermediate second circulation pipe 205 provided with the radiating fins 206 group. However, since the heated aqueous solution circulates naturally, the heat dissipating fins 206 are not heated unless the time passes after the sheathed heater 204 is energized, and the heat dissipating fins 206 also transfer heat from the second pipe 205. Therefore, temperature spots occur at the start end and the end end of the second tube 205.
Further, the heating method from the radiating fins 206 to the room is a natural convection method similar to that of the conventional example 1 (FIG. 11), but since the radiating body (radiating fin group) is housed in the case Ca, the radiant heat heating effect is Few.

The present invention solves or ameliorates the above-mentioned problems of a heater that integrates a conventional heating unit and a heat dissipation unit. Like the conventional examples 1 and 2, the heating unit and the heat dissipation unit are integrated. However, as the radiator, an exposed hot water circulation panel is adopted, and heat transfer from the heating part to the radiator is achieved as forced convection heat transfer, and heat transfer to the radiator is achieved without any defects. In addition, the heating from the radiator to the room is achieved by a natural convection method that is gentle to the human body, and a compact heater that can also maximize the radiant heating from the radiator is provided.

For example, as shown in FIG. 1, the present invention is an electric heating type hot water circulation heater in which an upper heat radiating unit 8 is integrated with a lower heater unit box 1, and the heat radiating unit 8 includes a hot water supply port 8S and It is a hot water circulation heat dissipating panel provided with a hot water discharge port 8R, and the panel surface is exposed. As shown in FIG. 3, the heater unit box 1 has a water fitting fitting 7, an air separation pressure tank 2, a circulation pump 3, The pipe heater 4 is connected by piping to accommodate the hot water circulation function section, and is connected to the heat radiating section 8 by the forward pipe S and the return pipe R, and the electric wire plug 9G is arranged at an appropriate position on the side face so as to be drawn out.

In this case, the meaning of “exposing the panel surface” means an exposure that can achieve radiant heat dissipation from the entire surface of the heat radiating panel to the room.
The heater unit box 1 may be an assembly of a plastic plate or an assembly of a metal plate, but for maintenance purposes, the casing is preferably configured to be detachable with a plate material.
Further, the circulation pump 3 and the pipe heater 4 housed in the heater unit box 1 may be prepared with conventional products. The circulation pump 3 may be a synthetic resin electromagnetic pump or a metal circulation pump. Adequate number of 1kw exothermic SC heaters (trade names) manufactured by Takumi Co., Ltd., which excels in energy savings, may be used according to the heating capacity, and the piping has excellent durability, heat resistance, and solvent resistance. Conventional ethylene-propylene rubber pipes may be used.

The heat radiating section 8 can be adopted as long as it is a hot water circulation type, and is a metal panel (trade name: Thermopanel) manufactured by Morinaga Engineering Co., Ltd., or a plastic radiator disclosed in Japanese Patent Laid-Open No. 2001-116475. Can also be adopted.
The air separation pressure tank 2 is a new tank developed under the proposition of weight reduction, size reduction, and price reduction as a tank that functions as an expansion tank and an air separator in a conventional hot water circulation heating system. It is a plastic sealed tank, and the capacity can be determined based on the amount of water circulating in the heater at room temperature, the amount during heating, and the air pressure during operation. As shown in FIG. 6, typically, a rectangular box having a capacity of 0.5 L (liter) is stacked with truncated pyramids to increase the degree of freedom of arrangement in the space-saving heater unit box 1. is there.

In addition, the control system may incorporate a temperature adjustment unit constructed by conventional microcomputer control in the heater unit box 1 and place the operation panel 9E at a suitable position on the outer surface of the heater unit box 1. In this case, the operation panel 9E If a clock function is incorporated in the power supply, it is effective for saving energy in heating by combining power on / off, temperature, and time.
Further, if a caster 1V is arranged on the bottom surface of the heater unit box 1 as shown in FIG. 1, the heater HC can move freely on the floor surface, and in combination with the pullable electric wire plug 9G, Usability is improved.

Therefore, the electric hot water circulation heater of the present invention is a compact heater in which the heat radiating unit and the heating unit are integrally assembled, and the heat of the heat radiating unit 8 is heated by forced circulation by the hot water circulation motor. Therefore, the heat radiating section, that is, the heat radiating panel surface becomes a uniform heat radiating body without generating temperature spots, and a gentle indoor heating gentle to the human body is achieved by natural convection heating from the heat radiating panel to the room.
Moreover, since the heat radiating panel surface is exposed, the radiating panel heat helps the radiant heating heat as well as the convection heating heat, and the heat radiating panel has a warm feeling even at a temperature that does not cause burns when touched. It provides mild and safe room heating that is safe for the elderly and children.

Further, as shown in FIG. 5, the heat dissipating part 8 of the heater of the present invention connects and communicates a group of plastic small-diameter vertical pipes 8B with plastic large-diameter horizontal pipes 8A at the upper and lower ends, and is connected to the lower-end horizontal pipe 8A. It is preferable to use the plastic resin heat dissipating panels 81 and 82 in which the hot water supply port 8S and the hot water discharge port 8R are arranged.
In this case, the number of the heat radiating panels 81 and 82 is not limited, but in the case of one, if the hot water supply port 8S is arranged at one end of the lower end horizontal pipe 8A, the hot water discharge port 8R becomes the other end side of the lower end horizontal pipe 8A. Therefore, the connection with the heater unit box 1 becomes complicated.
Further, if the heat dissipating panel is a three or more stacked type, the radiation heat dissipation effect from the intermediate heat dissipating panel surface is reduced.

Therefore, the heat dissipating panel is typically a two-layered type as shown in FIG. 5. If two heat dissipating panels are stacked, the hot water supply port 8S and the hot water discharge port 8R of the heat dissipating unit 8 are The same part (one end of the lower end horizontal pipe 8A) can be easily formed, and radiant heat dissipation from each panel also functions effectively for room heating.
In addition, the diameter of the vertical pipe 8B group in charge of the heat radiation surface and the diameter of the horizontal pipe 8A functioning as a circulation path and a reinforcing frame member are typically outside the horizontal pipe 8A in the 1 kW heater HC. The diameter (dA) is 27 mm and the wall thickness is 5 mm. The vertical pipe 8B has an outer diameter of 13 mm and a wall thickness of 1.6 mm.
Further, the connection with the upper and lower horizontal pipes 8A of each vertical pipe 8B group may be carried out by heat fusion means, and may be carried out by means disclosed in Japanese Patent Application Laid-Open No. 2007-247869.

Accordingly, the hot water (standard: 75 ° C.) supplied from the forward pipe S of the heater unit box 1 to the heat radiating panels 81 and 82 flows into the group of vertical pipes 8B from the lower end horizontal pipe 8A by forced circulation all at once. Is a uniform heating surface, the air around the heat radiating panels 81 and 82 is heated by natural convection, and warm and gentle to the human body by cooperating with the radiation radiation heat from the heat radiating panels 81 and 82 Shows good heating.
In addition, since the heat radiating panel is made of fully synthetic resin and the surface temperature of the heat radiating panel is 40 to 60 ° C., a safe indoor heater that does not burn even when touched by human hands is provided.

In addition, as shown in FIG. 5, the heat radiating unit 8 integrates the first heat radiating panel 81 and the second heat radiating panel 82 with a dimension in which the opposing surface gap GP allows the upward flow of only heated air. It is preferable to arrange the hot water supply port 8S at the lower end of the panel 81 on the one side of the lower end horizontal pipe 8A and the hot water discharge port 8R at the lower end of the second heat radiating panel 82 on the one side of the lower end horizontal pipe 8A.

In this case, as shown in FIG. 5, the first heat radiating panel 81 and the second heat radiating panel 82 are integrated by connecting the spacer pipe 8D at both ends of the lower end horizontal pipe 8A and the right end of the upper end horizontal pipe 8A. Only the left end of the horizontal pipe 8A communicates with the communication pipe 8C to secure a flow path from the left end of the first heat dissipating panel upper end horizontal pipe 8A to the left end of the second heat dissipating panel upper end horizontal pipe 8A. And the second heat radiating panel 82 are integrated so that the center distance W8 ′ of the horizontal pipe 8A is 31.5 mm, the opposing surface distance (space) GP between the first heat radiating panel 81 and the second heat radiating panel 82 is 18. .5mm.

And in the 1st heat radiating panel 81, while providing the hot water supply port 8S in the one end lower part of the lower end horizontal pipe 8A, each end surface of the lower end horizontal pipe 8A and the upper end horizontal pipe 8A is closed by the closing plate 8F, and the 2nd heat radiating panel. 82, each end face of the upper and lower horizontal pipes 8A is closed by a closing plate 8F, and at the left end of the upper end horizontal pipe 8A, a closing plate 8E is arranged between the left vertical pipe 8B and the next vertical pipe 8B, and the lower end. At the right end of the horizontal pipe 8A, a closing plate 8E may be disposed between the right vertical pipe 8B and the next vertical pipe 8B, and the hot water discharge port 8R may be disposed at a position corresponding to the right vertical pipe 8B.

Therefore, as shown in FIG. 5, the hot water from the forward pipe S of the heater unit box 1 flows into the hot water supply port 8S of the first heat radiating panel 81 → the lateral water f2 in the lower horizontal pipe 8A and the vertical pipe 8B group. Upflow water f3 in the inside → Flowing water f4 in the upper side horizontal pipe 8A → Lateral water f5 in the communication pipe 8C → Downstream water f6 at the left end of the second radiating panel 82 → Lateral water f7 in the lower side horizontal pipe 8A and the vertical pipe 8B The circulating pump 3 forcibly circulates in the path of the rising water f8 → the flowing water f9 in the upper end horizontal pipe 8A → the falling water f10 in the right end vertical pipe 8B → the flowing water f11 from the warm water discharge port 8R to the heater unit box return pipe R. .

The hot water supply port 8S and the hot water discharge port 8R of the heat radiating unit 8 are arranged at the same site, and the circulation path connection between the heat radiating unit 8 and the heater unit box 1 is connected at the same site, which can be easily implemented. .
Further, when the facing surface gap GP between the first heat radiating panel 81 and the second heat radiating panel 82 is 20 mm or more, there is a fear that a downflow of cool air may occur between the rising heated airflows on both sides, but 20 mm or less (standard) : 18.5 mm), the gap GP does not cause the flow of cold air from above, and the heated air does not cause heat accumulation, and the natural convection rises smoothly, thereby realizing a mild heating in the room.

In the present invention, it is preferable that all of the horizontal pipe 8A and the vertical pipe 8B of the heat radiation panels 81 and 82 are two-layer molded plastic pipes having a coating layer on the surface.
In this case, when the horizontal pipe 8A and the vertical pipe 8B are molded with PP-R resin (polypropylene random copolymer resin), the plastic for the surface layer is the same resin as the inner pipe body resin (PP-R resin). A desired pigment may be mixed in and extrusion-molded in two layers as a surface layer having a thickness of 0.4 to 0.6 mm (standard: 0.5 mm thickness).

Therefore, the heat radiating panels 81 and 82 to be exposed for radiant heat dissipation can be created under the color design desired by the customer, and prevent the deterioration of ultraviolet rays on the pipe surface. can get.
In addition, although the pipes 8A and 8B of the exposed plastic heat dissipating part are colored in a desired color, the inner pipe body is a plastic resin in which no pigment is mixed. A decrease in durability is avoided.

Further, in the present invention, the heater unit box 1 attaches the closing device 17 provided with the vertical cutouts 17C to the outer surface of the outer end plate 17S at both ends in the longitudinal direction of the bottom plate 1C, and a pair of longitudinal directions. The left side plate 1A and the right side plate 1B are detachably fixed to the bottom plate 1C and the closing tool 17 in a form covering the bottom plate 1C and the closing tool 17, and the upper end horizontal pipe 8A of the heat radiating portion 8 is supported by being suspended. The longitudinal direction both ends of the upper frame 13 and the vertical side frame 15 connected via the upper joint 16 are fitted into the notch 17C of the closing tool 17 from above, and the lower end of the side frame 15 is supported by the closing tool 17 It is preferable to do this.

In this case, the heater unit box 1 itself has a rigid structure composed of the bottom plate 1C, the side plates 1A and 1B on both sides, and the closures 17 on both ends, and radiates heat to the opening O1 on the upper surface formed by the side plates 1A and 1B. Since the lower end of the part 8 is inserted in a free-hanging form, the distance (opening O1) between the upper end of the left side plate 1A and the right side plate 1B is the workability of assembling the heat radiating part 8 to the heater unit box 1 And from the viewpoint of securing a rising gap of heated air for minimizing heat accumulation at the insertion portion at the lower end of the heat radiating portion 8, typically, as shown in FIG. Both side plates 1A and 1B are bent inward and have a leading edge formed as an inward protruding side 1E, and an opening O1 is secured between the protruding sides 1E on both sides of the upper end to provide a design effect. It is a thing.

Further, the left and right side plates 1A and 1B, the bottom plate 1C, and the closing member 17 forming the heater unit box 1 may be metal plates. However, if plastic plates are used, the heat radiation panels 81 and 82 are combined with plastics for heating. The entire device HC can be reduced in weight and easy to handle.
In this case, if only the bottom plate 1C constituting the bottom surface of the heater unit box 1 is made of a steel plate, sufficient strength can be imparted to the arrangement of various functional devices arranged in the heater unit box 1, and a lightweight heater. It is effective in preventing the fall of HC.

Therefore, in the heater unit box 1, if the left side plate 1A and the right side plate 1B having the effect of the decorative frame are removed from the bottom plate 1C and the closing member 17, the heat radiating portion 8 can be removed, and one of the side plates 1A and 1B is removed. By removing, maintenance of the hot water circulation function unit becomes possible.
And since the upper frame 13 suspends the upper end horizontal pipe 8 </ b> A in such a manner as to allow left-right sliding and the side frames 15 support the both ends of the upper frame 13 on the heater unit box 1. There is no problem in heating and extending the panels 81 and 82 downward in the vertical pipe 8B group and in the horizontal heating of the horizontal pipe 8A.

Further, in the heater of the present invention, as shown in FIG. 8, the upper frame 13 includes a longitudinal notch 13A on the upper side 13T, and the curved contact portions 13R on both sides are provided below the notch 13A. A bottom plate 13B having a central air outflow hole H13 is provided, a rigid hollow portion 13G having a curved contact portion 13R is disposed inside the lower ends of the vertical sides 13F on both sides, and the upper lid 18 has air at the center of the width. The holes Ha group are aligned and arranged, the falling pieces 18F provided with the locking claws 18G protrude downward from both sides of the air holes Ha group, and the upper lid 18 is inserted into the notch 13A of the upper frame 13 via the falling pieces 18F. It is preferable to fit it detachably.

In this case, in the upper frame 13, the curved contact portions 13R on both sides of the bottom plate 13B and the curved contact portions 13R of the rigid hollow portion 13G are provided on the heat radiation panels 81 and 82 as shown in FIG. It is only necessary that the upper end horizontal pipe 8A can be clamped and held from the upper side and the lower outer side. Typically, the both curved surface contact portions 13R are curved surfaces aligned with the horizontal pipe 8A.
Further, the air hole Ha group of the upper lid 18 only needs to be able to discharge the heated air flow from the lower heat radiating panels 81 and 82 uniformly. Typically, as shown in FIG. 8D, the width W18 is 30 mm. In the upper lid 18 having a length of 222 mm, long holes in the width direction (standard: width 3.5 mm, length 18 mm) Ha are perforated while holding a space of 2 mm.

Therefore, the upper frame 13 firmly holds the upper horizontal pipe 8A of the heat radiation panels 81 and 82 by the curved contact portion 13R of the lower rigid hollow portion 13G and the curved contact portion 13R of the upper bottom plate 13B. Thus, the heat radiation part 8 can be suspended and held.
An air outflow hole (standard: width 18 mm, length 154 mm) H13 for the upper frame 13 manufactured as a long (standard 670 mm) extrusion-molded product is perforated to the bottom plate 13B below the notch 13A having poor drilling workability. From the viewpoint of workability, even if they are arranged at an appropriate form and interval, by arranging a uniform and orderly air hole Ha group on the single-plate top cover 18 that is easy to punch. On the upper surface of the heater HC, the air holes Ha of the upper lid 18 have a visually uniform air release function, combined with the appearance of both side lines of the upper lid 18, and an excellent appearance in functional design Become.

Further, the upper frame 13, the upper lid 18, the upper joint 16, the side frame 15, the left side plate 1A, the right side plate 1B and the closing member 17 constituting the frame of the heater HC are all made of plastic, and the extruded product is The surface is provided with a coating layer, the injection-molded product is preferably made of a pigment-mixed resin, and the left side plate 1A and the right side plate 1B are preferably laminated plates of an outer skin plate PR and an inner skin plate Pr.
In this case, the upper frame 13, the upper lid 18, the side frame 15, the left side plate 1 </ b> A, and the right side plate 1 </ b> B are long and can be extruded, so that the surface coating layer is mixed with pigment in the main body synthetic resin. The raw material thus prepared is prepared as a surface layer having a thickness of 0.5 mm, and a two-layer extrusion molding having a required thickness with the inner layer may be performed. In the case of an injection molded product, it may be molded with a pigment-mixed resin.

Therefore, in the heater of the present invention, the heat dissipating part 8 is made of plastic and the frame for holding the heat dissipating part is also made of plastic, so that the weight can be reduced and the color design product desired by the consumer can be obtained.
In this case, trial and error production of color matching is necessary to overcome subtle color differences due to the difference between the plastic of the heat radiation part (standard: PP-R resin) and the plastic of the frame material (standard: polycarbonate resin). It becomes.

However, as the decorative frame of the heater unit box 1, the left side plate 1A and the right side plate 1B, which are long members that define the external portion, are overlapped with the outer skin plate PR and the inner skin plate Pr. Even if the color of the outer skin plate PR is incompatible and discarded, the inner skin plate Pr can be used, the waste of material costs due to color matching can be reduced, and the production cost can be suppressed.
Moreover, the left side plate 1A and the right side plate 1B typically have large shapes and cross-sectional shapes, as shown in FIG. In order to obtain the necessary wall thickness (standard: 3 mm thickness) for holding the sheet, molding distortion (out of shape) is likely to occur in the extrusion molding. However, as the two-plate form of the outer skin plate PR and the inner skin plate Pr, Since the thickness is reduced, molding distortion can be suppressed.

Further, in the heater of the present invention, the water-filled joint fitting 7 disposed in the heater unit box 1 has a pipe connecting hose nipple portion 7J for connecting the outer periphery of both ends of the pipe portion 7T as shown in FIG. From the center of the pipe part 7T, the gate valve 7B for opening and closing the water channel of the pipe part 7T protrudes, the connection part 7D protrudes on both sides of the gate valve 7B, and the ball valves 7A and 7C are detachably attached to each connection part 7D. It is preferable to be screwed to the pipe and disposed in the piping path in the heater unit box 1.
In this case, the gate valve 7B protrudes in the shape of a pipe and has a surface structure for opening and closing the gate valve 7B at the tip. Typically, the gate valve 7B has a pipe portion (standard: length 97 mm). , 13.5 mm in diameter) It is a pipe shape of the same diameter as 7T (standard: 13.5 mm), protrudes 50 mm, and rotates by rotating the tip rotation surface with a cross driver.

Accordingly, water filling into the heater HC is performed by closing the gate valve 7B and connecting the ball valve 7A to the water tap 6A using the pressure hose 6C and the ball valve 7C as shown in FIG. 4C. Connect to a bucket 6B filled with water using a transparent hose 6D, fill the water flow path in the heater with the pressure running water from the ball valve 7A, and check the water jetted from the ball valve 7C into the bucket. Thus, water of a predetermined pressure can be filled in the closed circulation path.

In this case, the transparent hose 6D from the ball valve 7C into the bucket maintains a head corresponding to the desired water pressure, and the ball valve 7A is closed to eliminate the addition of tap water pressure, thereby filling the pressure water of the design value. After the filling water is replaced with air, the ball valves 7A and 7C are closed and the gate valve 7B is opened, so that the heater HC can be operated in the piping path in the heater.
Therefore, water filling into the heater HC can be easily performed through the intervention of the small new water-tight joint fitting 7, resulting in a maintenance-free hermetic hot water circulation heater.

Further, as shown in FIG. 6, the air separation pressure tank 2 includes a lower side 2D, a front side 2F, a rear side 2B, an upper side 2T, and both side sides 2L and 2R, and the upper side 2T is a front side with a front inclined side Sf. 2F and a box shape that is continuous with the rear side 2B at the rear inclined side Sb, and a connection port J1 is provided at the intermediate portion in the vertical direction of the front side 2F, and a connection port J2 is provided at the intermediate portion in the vertical direction of the rear side 2B. The upper side 2T is provided with a connection port J3 at the rear thereof, and the two blades 2A and 2A 'inclined upwardly between the two sides 2L and 2R are connected to each other, and the front blade 2A is connected to the front side 2F. The rear blade 2A 'is disposed at a position corresponding to the rear side of J1 above the front blade 2A and at a position corresponding to the lower side of the upper side connection port J3. The front connection port J1 is connected to the return pipe R side and the rear connection. It is preferable to connect the port J2 with the circulation pump 3 side and close the upper connection port J3 with the cap 2C. Yes.

In this case, the size of the air separation pressure tank 2 increases with the amount of water filled in the closed circulation system at normal temperature (standard: 15 ° C.) and hot water (standard: 80 ° C.), and the amount of water during expansion. It is only necessary to calculate and determine from the air pressure in the tank 2 to be generated. If the connection ports J1 and J2 are arranged so as to be below the water level even at room temperature, the generation of water falling noise can be suppressed.
The lower blade 2A and the upper blade 2A ′ both generate a control turbulent flow for promoting air separation. Typically, both of the lower blade 2A and the upper blade 2A ′ are inclined by 30 °, and the front blade 2A The width W5 is 35 mm, and the width W6 of the rear blade 2A ′ is 40 mm.

The air separation pressure tank 2 is small and made of plastic resin, and has been developed under the proposition of eliminating the need for an air vent valve and air release valve, and is about three times stronger than the explosion strength at high pressure in the circulation path ( (Safety factor: 3 times), typically made of plastic with a thickness of 0.6mm, and for a radiator of 1kw capacity, water capacity is 0.28L (liter) at room temperature, in the circulation path (system Inner) When the pressure is 0.01 MPa and the temperature is 80 ° C., the amount of water is 0.34 L (liter) and the internal pressure of the system is 0.04 MPa.

Note that if the air separation pressure tank 2 is made of a translucent plastic, it can be seen from the outside, and the inflow state of water at the time of water filling work can be visually observed, which is convenient in work.
Therefore, as shown in FIG. 4A, the air separation pressure tank 2 used in the present invention has two blades 2A and 2A ′ that control the inflow hot water flowing into the tank 2 and control turbulence effective for air separation. Divide into

In this case, the flowing water w1 at the flow velocity (standard: 0.885 m / s) from the connection port J1 becomes w2 in the tank 2 and rapidly decelerates (standard: 0.118 m / s). In combination with w4 (0.063 m / s) and decelerating flow, air bubbles in the water are suitably separated and raised as ascending air a1, a2, a3, and the generated air in the circulation path is Secure in the air zone Za above the tank 2 safely.
For this reason, the air separation pressure tank 2 used as a pressure tank by closing the connection port J3 of the upper side 2T with a rubber cap 2C is a tank 2 that does not require the arrangement of a safety relief valve or an air vent valve in a sealed hot water circulation heater. And the upper half is provided with the inclined sides Sf and Sb, so that it can be arranged in a limited space, and the heater unit box 1 can be downsized.

Although the electric hot water circulation heater HC of the present invention is a compact heater in which a radiator and a heating unit are integrally assembled, heating of the radiator 8 becomes heating by forced circulation by a hot water circulation motor. The hot water circulation heat radiating panel surface constituting the heat radiating section 8 exhibits a uniform heat radiating action at a uniform temperature without causing temperature spots, and is friendly to humans by natural convection heating to the room from the heat radiating panel surface. Provide mild room heating.

Moreover, since the heat radiating panel surface is exposed, from the heat radiating panel surface, radiant heating heat is assisted together with convection heating heat, and even if the heat radiating panel surface is at a temperature that does not cause burns even if it is touched manually, It provides a warm and welcoming, gentle heating that is safe and secure for the elderly and children, and that is safe and secure.

Moreover, since the hot water circulation function part of the heater unit box 1 integrated with the heat radiating part 8 is provided with the water-filled joint fitting 7, water filling and air venting work in the closed hot water circulation system in the manufacturing factory is possible. It can be implemented simply, and the air separation pressure tank 2 can function as an expansion tank and an air separator, so that an indoor hot water circulation heater that does not require maintenance can be provided.

It is explanatory drawing of the hot water circulation heater of this invention, Comprising: (A) is a front view, (B) is a right view. It is explanatory drawing of this invention heater, Comprising: (A) is a vertical side view, (B) is a vertical front view. It is explanatory drawing of a heater unit box, (A) is a front view in a box, (B) is a top view in a box, (C) is a vertical side view, (D) is a water flow system diagram. It is explanatory drawing of this invention, Comprising: (A) is an effect | action explanatory drawing of an air separation pressure tank, (B) is a top view of a water filling joint metal fitting, (C) is a water filling explanatory drawing. It is explanatory drawing of a thermal radiation part, Comprising: (A) is a front view of a 1st thermal radiation panel, (B) is a left view, (C) is a right view, (D) is a 2nd thermal radiation panel front view. It is explanatory drawing of an air separation pressure tank, (A) is a perspective view, (B) is a longitudinal cross-sectional view of the BB line of (A), (C) is a side view seen from the arrow C in FIG. (D) is a front view. It is an exploded perspective view of a heater, (A) is an upper lid, (B) is an upper frame, (C) is a heat dissipation part, (D) is a heater unit box, and (E) is an upper joint. (F) is a figure which shows a side frame and (G) is a closing tool. It is explanatory drawing of a frame material, Comprising: (A) is a vertical side view of an upper frame, (B) is a cross-sectional view of a side frame, (C) is an explanatory view of a state in which an upper lid is fitted to an upper frame, (D ) Is a plan view of the upper lid. It is explanatory drawing of an upper joining tool, (A) is a front view, (B) is a top view, (C) is a vertical side view, (D) is a fitting state explanatory drawing with an upper frame. It is explanatory drawing of the housing of a heater unit box, (A) is a disassembled perspective view, (B) is the attachment state longitudinal cross-sectional view of a baseplate and a side plate, (C) is a perspective view of a closing implement, (D) is The cross-sectional view of the closing device, (E) is a vertical cross-sectional view of the mounting state of the closing device. It is explanatory drawing of the prior art example 1. FIG. It is explanatory drawing of the prior art example 2, Comprising: (A) is a principal part perspective view, (B) is a whole front view.

1 Heater unit box (box)
1A, 1B Side plate 1C Bottom plate 1D Horizontal side 1E Protruding side 1F, 1f Vertical side 1P Rising piece 1T, 1t Upper side 1V Caster 1W Lower side 2 Air separation pressure tank (pressure tank, tank)
2A Front blade (blade)
2A 'Rear blade (blade)
2B Rear side 2C Rubber cap (cap)
2D Lower side 2F Front side 2G Annular protrusion (protrusion)
2L, 2R Side 2T Top 3 Circulating pump 3J Connection 4 Pipe heater 5A Piping (rubber pipe)
5B Hose band 6A Water faucet (faucet)
6B bucket

6C Pressure-resistant hose 6D Transparent hose 6E Water pressure applying position 7 Water-filled joint fittings 7A, 7C Ball valve 7B Gate valve 7D Connection portion 7J Hose nipple portion 7T Pipe portion 8 Heat radiation portion 8A Horizontal pipe 8B Vertical pipe 8C Communication pipe 8D Spacer pipe 8E, 8F Closing plate 8R Hot water discharge port 8S Hot water supply port 9E Operation panel 9G Electrical plug 13 Upper frame 13A Notch 13B Bottom plate 13C Falling piece 13D Horizontal side 13F Vertical side 13G Hollow part 13R Curved contact part 13S Inclined side

13T Upper side 13U Bearing side 15 Side frame 15A Side vertical side 15D Outer vertical side 15F Inner vertical side 15S Inclined side 16 Upper joint 16A Side vertical side 16B Insertion part 16C Protrusion 16D Outer vertical side 16F Inner vertical side 16K Support pieces 16E, 16M Projection piece 16E ', 16M' Locking piece 16S Inclined side 16T Upper side 17 Closure 17A Anchor side 17B Lower side 17C, 17C 'Notch 17E Falling piece 17F Vertical side 17P, 17P' Reinforcement side 17R Curved surface 17S Outer end plate ( Outside edge)
17T Upper side

18 Upper lid 18F Falling piece 18G Locking claw 18T Upper side 81 First heat radiation panel (heat radiation panel)
82 2nd heat dissipation panel (heat dissipation panel)
Ha Air hole GB, GP interval (space)
HA, HA 'insertion grooves H2, H3, H7, H7', H7 ", H17, H17 ', H17" Screw insertion hole H2' Drop hole H9 Wire insertion hole H13 Air outflow holes H13 ', H13 ", H15 Mating hole HC Hot water circulation heater (heater)
HE insertion hole HT slat plate insertion hole J1, J2, J3 connection port O1 opening PR outer skin Pr inner skin R1, r1 curved surface R return pipe (return pipe)
S Outward pipe (supply pipe)
Sb Rear side (side)
Sf Front side (side)
Za air region

[Heater unit box (Fig. 1, Fig. 2, Fig. 10)]
FIG. 1 is an explanatory diagram in which a heat radiating unit 8 is integrated with a heater unit box 1, (A) is a front view, (B) is a side view, and FIG. 2 (A) is a longitudinal side view of a heater. FIG. 2 (B) is a longitudinal sectional front view of the heater, and FIG. 10 is an explanatory view of the casing of the heater unit box 1.
The heater unit box 1 is connected to the lower end of the heat radiating unit 8 and houses a heating unit and a circulation function unit therein.

As shown in FIGS. 1 and 2, the overall shape of the heater unit box 1 is the same length as the heat radiating portion 8, and a plastic left side plate 1A and a right side plate 1B that have a decorative plate effect are joined by a steel plate bottom plate 1C. Then, both end portions are joined by a closing tool 17, and on the upper surface, as shown in FIG. 2A, an opening O1 for inserting a heat radiation panel is provided at the upper ends of the left side plate 1A and the right side plate 1B.
The left side plate 1A and the right side plate 1B are symmetrical with the same shape, have an outwardly bulging curved surface with a radius of curvature of 400 mm, and the heater unit box 1 has a bottom surface width W1 (170 mm) to a top surface width W1 ′. (90mm) bent at a height L1 (146mm), and on the upper surface, the opening for inserting a heat dissipation panel between the projecting sides 1E of the upper side 1T on both sides projecting inward horizontally from the upper ends of both side plates 1A, 1B The portion O1 is formed.

[ Side plates 1A, 1B (FIG. 10A)]
The left side plate 1A and the right side plate 1B are prone to molding distortion in extrusion molding with a required strength thickness (standard: 3 mm), and the material cost to be discarded as a defective product by color matching of the product as a decorative plate In order to reduce waste, it has a double structure consisting of a thin plate (standard: 1.5 mm thick) skin plate with a coating layer and a plain thin plate (standard: 1.5 mm thick) endothelial plate. As shown in FIG. 10, the outer skin plate PR is superposed on the inner skin plate Pr.
In this case, the outer skin PR is formed by two-layer extrusion using a 1.5 mm thick plastic resin (polycarbonate resin) having a 0.5 mm thick coating layer, and the inner skin Pr is 1.5 mm thick plastic resin (polycarbonate). Resin).

As shown in FIG. 10A, the cross-sectional shape of the outer skin plate PR is 146 mm in height, has a vertical side 1F (height 26 mm) and a lower side 1W (width: 27 mm) at the lower end, and a step d17 from the vertical side 1F. A curved surface portion R1 bent inward with a curvature radius of 400 mm rising through (2 mm), and an upper side 1T protruding inward from the upper end of the curved surface portion R1 (protruding width: 16 mm). 1E protrudes through the paragraph of the thickness (1.5 mm) of the endothelial plate Pr.

Further, the endothelial plate Pr includes a curved surface portion r1 and a vertical side 1f aligned from the inner surface to the outer skin plate PR, and an upper side 1t protruding inward at the upper end. If the inner skin is inscribed in the outer skin plate PR, the upper side 1t becomes the outer skin. The curved surface portion r1 is aligned with the inner surface of the outer skin plate curved surface portion R1 and the vertical side 1f is aligned with the inner surface of the outer skin plate vertical side 1F and overlaps with the lower surface of the upper surface side 1T. If 1f is integrated with the outer skin plate vertical side 1F with a bolt b1 via a screw insertion hole H3, the inner skin Pr is inserted into the outer skin plate PR at both ends in the longitudinal direction, and the anchor side 17A of the closure 17 is fitted into the fitting dimension. It is shortened by W17 ′ (15 mm).
Then, a conventional operation panel 9E insertion hole HE for device control is arranged at an appropriate position on either the left side plate 1A or the right side plate 1B of the laminated structure of the outer skin plate PR and the inner skin plate Pr.

[Bottom plate 1C]
The bottom plate 1C is a reinforcing material for the lower side of the heater unit box 1, and a conventional caster 1V (manufactured by Free Bear Corporation, product number P-5L-5) is disposed on the lower surface for heating. The HC is also provided with a toppling prevention function, and is a 2.3 mm thick steel plate bent product, as shown in FIGS. 10 (A) and 10 (B), standing up from the horizontal side 1D and both sides of the horizontal side. A rising piece 1P is provided, the width is 164 mm, and the height of the rising piece 1P is 15 mm.

Further, notches 17C ′ for aligning and fitting the notches 17C of the closing tool 17 are arranged at both ends in the longitudinal direction and in the center in the width direction of the horizontal side 1D, on both sides in the width direction of the horizontal side 1D and at both ends in the longitudinal direction. In the part, a screw insertion hole H17 ′ for wearing the lower side of the closure 17 is drilled, and the lower side 1W of the left and right side plates 1A and 1B, that is, at the appropriate positions in the length direction on both sides of the horizontal side 1D, that is, A screw insertion hole H2 for screwing with a screw insertion hole H2 on the lower side 1W of the outer skin plate PR is disposed in the center of the drop hole H2 ', and the outer skin is also placed at an appropriate position in the longitudinal direction of the rising piece 1P. A screw insertion hole H3 that is aligned with the screw insertion hole H3 on each of the vertical sides 1F and 1f of the plate PR and the endothelial plate Pr is disposed.

[Blocker 17 (FIG. 10C)]
Further, the closing device 17 fitted and fixed to both ends of the heater unit box 1 is fixed to both ends in the longitudinal direction of the bottom plate 1C, and requires rigidity to ensure attachment / detachment of the covering forms of the both side plates 1A and 1B. A plastic (polycarbonate resin) integral molded product with a thickness of 3 mm, and has an upper side 17T, a curved surface portion 17R, and a lower side 17B as shown in FIG. 10C, and the curved surface portion 17R and the lower side 17B are continuous with a vertical side 17F. In addition, the outer end is closed at the outer side edge 17S, and the end of the left and right side plates 1A and 1B having a width W17 '(15mm) and a thickness of 1.5mm from the closure body having a width W17 (40mm). The anchor side 17A that abuts against the inner surface extends inwardly in the form of a paragraph (1.5 mm paragraph) that can collide with the endothelial plate Pr, and the side frame 15 of the heat radiating portion is fitted and fitted to the outer end surface. Through the vertical direction of the C-shaped cross section Outs 17C, in recessed form in the outer end side 17S, vertical reinforcing edges 17P, are arranged in 17P'.
Then, an electric wire insertion hole H9 (FIG. 1) is formed in the outer end side 17S of any one of the closing tools 17.

[Assembly of the box]
As shown in FIGS. 10 (B) and 10 (E), the heater unit box 1 is assembled by placing the horizontal side 1D of the bottom plate 1C on the upper surface of the lower side 17B of the closure 17 and cutting the bottom plate. 17C ′ is fitted into the notch 17C of the closing tool 17, and the end of the bottom plate 1C and the closing edge 17B of the closing tool are inserted from the lower surface of the closing tool 17 through the screw insertion hole H17 ′ as shown in FIG. Secure with bolts b17.
Further, as shown in FIG. 10 (E), the endothelial plate Pr collides with the anchor side 17A protruding in the 1.5 mm paragraph of the closing device 17, and the outer skin plate PR includes the endothelial plate Pr and the closing device 17. And the screw insertion hole H17 on the upper side 1T of the outer skin plate PR and the screw insertion hole H17 on the upper end of the anchor side 17A of the closure 17 are fixed with a nut n17 and a bolt b17.

Then, after fixing one side plate 1A or 1B to the bottom plate 1C and the closing member 17, necessary equipment is arranged by piping through the bottom plate 1C and the side plate 1A (1B), and the heater unit box of the heat radiating section 8 in the next step After the connection to 1 and water filling into the circulation path are completed, the other side plate 1B (1A) is attached in the same manner.
Accordingly, the upper side 17T of the closing member 17 is flush with the upper sides 1T of the side plates 1A and 1B, the curved surface portion 17R of the closing member 17 is flush with the curved surface portion R1 of the side plates 1A and 1B, and the vertical side 17F of the closing member 17 is. Is connected to the vertical sides 1F of the side plates 1A, 1B in a flush manner, and the side plates 1A, 1B as the decorative plates and the closures 17 at both ends exhibit a sense of continuous integration without any gaps.

[Air separation pressure tank 2 (Fig. 6)]
The air separation pressure tank 2 is disposed in the heater unit box 1 to deal with volume expansion due to thermal expansion of the circulating hot water in the heater HC, and separates and stores air bubbles from the circulating water. It is a new small plastic tank that combines the functions of an expansion pressure tank and an air separator.
6A is a perspective view of the air separation pressure tank (pressure tank) 2, FIG. 6B is a longitudinal sectional view taken along line BB of FIG. 6A, and FIG. FIG. 6A is a front view as viewed in the direction of arrow C in FIG. 6A, and FIG. 6D is a front view.

The air separation pressure tank 2 is made of plastic (polyethylene) resin having a general wall thickness of 0.6 mm, and the overall shape is as shown in FIGS. 6B and 6C. , Rear side 2B, and both sides 2L, 2R, having a box shape with a width W2 of 50 mm, a length L2 of 140 mm, and a height h3 of 55 mm. The upper part is an upper side 2T, and the front side 2F is an upper side 2T. A 45 ° front inclined side Sf following the rear side 2B and a 45 ° rear inclined side Sb continuing from the rear side 2B to the upper side 2T, and the side sides 2L and 2R are continuously connected to the upper side 2T with a gentle slope. The length h4 is 30 mm, the front inclined side Sf and the rear inclined side Sb are front and rear lengths L4 of 35 mm, the upper side 2T length L3 is 70 mm, and the upper side 2T width W3 is 38 mm.

The front side 2F and the rear side 2B are positioned at a height of 30 mm (d5) from the bottom side 2D at the center in the width direction, and the upper side 2T is positioned at a position of a length L5 (55 mm) from the rear side 2B. A pipe piece having an outer diameter of 16 mm, a thickness of 2 mm, and a protruding length of 20 mm is projected, and a front side connection port J1, a rear side connection port J2, and an upper side connection port J3 are arranged.
Further, each of the connection ports J1, J2, J3 has a width of 1 mm and a protruding length as shown in FIG. 6 (D) in order to ensure attachment of a rubber pipe (ethylene-propylene rubber pipe) 5A and a rubber cap 2C employed as piping. Two annular projections 2G having a thickness of 0.5 mm are arranged at intervals.

Further, as shown in FIGS. 6A and 6B, the front slats 2A and the rear slats 2A ′ are arranged at an inclination angle of 30 ° in the left and right sides 2L and 2R in a passing manner.
In this case, the blades 2A and 2A ′ may be integrally formed during molding, or the blade plate insertion holes HT may be formed in the side plates 2L and 2R during molding, and a plastic plate may be inserted and inserted in a later process. good.
The structure of each blade is such that the front blade 2A is a plate having a width W5 of 35 mm and a thickness of 6 mm from a position 25 mm (L6) rearward from the front side 2F and a height of 20 mm (h5) from the bottom 2D. The rear slats 2A ′ are arranged with an inclination of 30 mm from the rear side 2B to the front 55 mm (L5) and from the bottom 2D to a height 35 mm (h6), and have a width W6 of 40 mm and a thickness of 6 mm. ° Arrange at an angle.

Therefore, the air separation pressure tank 2 is a small tank having a width W2 of 50 mm, a length L2 of 140 mm, a height h2 of 85 mm, and an upper portion with a truncated pyramid shape. Although it is easy to incorporate into the heater unit box 1, the total capacity is 0.5 L (liter), and if it is filled at 0.01 MPa in a closed circulation system, as shown in FIG. When the water temperature is 0.28 L (liter) at a normal temperature (standard: 15 ° C.), the space volume is 0.22 L (liter) and the water level is wL ₁ , the pressure in the pressure tank is 0. becomes 04Mpa, water capacity 0.34L, the spatial volume 0.16 L, level plane is wL _2.

Then, as shown in FIG. 4A, the connection port J3 of the upper side 2T is closed with the rubber cap 2C, and the hot water flowing from the front side connection port J1 to the rear side connection port J2 flows from the connection port J1 to the circulation flow rate 0. It flows into the pressure tank 2 at 885 m / s (w1), suddenly decelerates in the tank 2, collides with the front blade 2A, becomes a control turbulent flow, water and air are separated, and the front blade 2A On the lower side, the flow velocity becomes slow at 0.118 m / s (w2), which promotes air separation. Further, the air-containing water flow has a flow velocity of 0.063 m / s (w3) below the rear blade 2A ′. Then, the remaining inclusion air is separated, and the hot water from which the air has been separated flows out from the outflow connection port J2 at a circulation flow rate of 0.885 m / s (w4).

[Circulating pump 3 (Fig. 3)]
The circulation pump 3 employs a pump (model: D5-32 / 700B) manufactured by Lang (Germany) having a total outer diameter of 80 mm and a total height of 82 mm.
The pump 3 has a surface made of brass (copper-zinc alloy) and a plastic resin, and an interior made of stainless steel and a plastic resin. Therefore, a conventional metal heat radiation panel and a plastic resin heat radiator are used. However, there is no fear of corrosion, small size, light weight, low driving noise, and smooth water circulation.

[Pipe heater 4 (FIG. 2C)]
The pipe heater 4 is a conventional product made of stainless steel having a wall thickness of 2 mm, an outer diameter of 15.9 mm, a length of 228 mm, and both ends are swelled with a paddle to prevent the rubber pipe 5A from being pulled out. It is a thing.
An insulating layer, a conductive layer, and a heat insulating layer are thermally sprayed on the outer periphery of the stainless steel pipe to obtain an energy saving heater having a high power density of 30 w / cm ² and a thermal efficiency of 95%.
In the pipe heater 4, the water temperature rises and the heating rises quickly because water flows in the stainless steel pipe.
If the pipe heater 4 is coated with a heat insulating material having a thickness of 20 mm, the thermal efficiency is improved.
The 1 kw pipe heater 4 saves energy by using two 500 w combinations.

[Piping 5A (Fig. 2)]
The pipe 5A employs a conventional ethylene-propylene rubber (EPDM) pipe having excellent durability, heat resistance, weather resistance, solvent resistance, light weight and high flexibility, with a thickness of 3 mm and an inner diameter of 14 mm. .

[Water-filled fitting 7 (FIG. 4B)]
FIG. 4 (B) is an explanatory view of the water-filled joint fitting 7 and is a new joint fitting developed for the present invention.
As shown in FIG. 4 (B), the water-filled joint fitting 7 is a T-shaped gunmetal pipe member. The pipe portion 7T has a length L7 of 97 mm and a diameter R7 of 13.5 mm, and both ends are connected to rubber pipes. A pipe-shaped gate valve having a nipple portion 7J having a length of 12 mm, a diameter of 13.5 mm from the center of the pipe portion 7T, a length (W7) of 50 mm, and a valve body that opens and closes the water channel in the pipe portion 7T. 7B protrudes from the gate valve 7B to the left and right, each at a position of 23 mm, with a horizontal side with a width of 9 mm for fixing a gripping jig (pipe wrench) on the opposite side, and with a screw insertion hole H7 ′. The connecting part 7D is integrally molded with a pipe part 7T projecting 19 mm long.

Then, if a rotation surface with a cross groove is arranged in the screw insertion hole H7 at the tip of the gate valve 7B and the rotation surface is rotated by a cross driver, the valve body having a triangular cross section moves back and forth. The water channel of the pipe portion 7T is opened and closed.
Accordingly, the water filling operation is carried out by screwing and connecting ball valves 7A and 7C, each having a hose connection screw insertion hole H7 "at its tip, to the screw insertion hole H7 'of the connection portion 7D. The valve 7B is closed, the ball valve 7A is communicated with a water tap with a pressure hose through a screw insertion hole H7 ", and the ball valve 7C is watered with a transparent hose through a screw insertion hole H7". It can be implemented by connecting with a stretched bucket to fill the circulation path with water, filling water under a predetermined pressure, and then opening the gate valve 7B and closing the ball valves 7A and 7C.

[Temperature adjustment unit]
As in the conventional hot water circulation heating system, operation control, temperature control, room temperature detection, and the like are performed by a conventional electric control means built in a microcomputer.
In this case, if the on / off control of the operation and the room temperature control are controlled via a clock function, the energy saving operation of the heater can be performed.
As shown in FIG. 1, the adjustment unit operation panel 9 </ b> E may be inserted into the insertion holes HE arranged at appropriate positions on the left and right side plates 1 </ b> A and 1 </ b> B of the heater unit box 1.

[Heat dissipation part 8 (Fig. 5)]
The heat radiating section 8 adopts two sheets of a first heat radiating panel 81 and a second heat radiating panel 82 constructed in a communication form with plastic pipes, covers the upper surface with the upper frame 13 and the upper lid 18, and by the column action of the side frame 15. It arrange | positions at the upper part of the heater unit box 1, heats with the heating hot water supplied from the heater unit box 1, and radiates heat indoors.
5A is a front view of the first heat radiating panel 81, FIG. 5B is a left side view of the heat radiating portion 8, FIG. 5C is a right side view of the heat radiating portion, and FIG. 7 is a front view of a second heat dissipation panel 82. FIG.

As shown in FIG. 5, both the first heat radiating panel 81 and the second heat radiating panel 82 are formed by fusing and integrating a thin vertical pipe 8B group into a communication form with upper and lower horizontal pipes 8A. An outer diameter of 13 mm, a wall thickness of 1.6 mm, a thick horizontal pipe 8A is prepared with an outer diameter of 27 mm and a wall thickness of 5 mm, a vertical pipe 8B is prepared with a length of 455 mm, and a horizontal pipe 8A is prepared with a length of 613 mm (L8 '). Each horizontal pipe 8A is closed at both ends by a 5 mm thick closing plate 8F, and a hot water supply port 8S protrudes downward from the right end of the lower end horizontal pipe 8A of the first heat radiating panel 81.
Each vertical pipe 8B group has a distance ap between the centers of 20 mm, a space (interval) GB between the vertical pipes 8B of 7 mm, and is fused and connected between the upper and lower horizontal pipes 8A to form a circulation channel. .

Further, in the second heat radiating panel 82, as shown in FIG. 5D, the left end of the upper end horizontal pipe 8A is 5 mm thick at a position between the left end vertical pipe 8B and the next vertical pipe 8B. A closing plate 8E is interposed, and at the right end of the lower end horizontal pipe 8A, a 5 mm-thick closing plate 8E is interposed between the right end vertical pipe 8B and the adjacent vertical pipe 8B. The hot water discharge port 8R protrudes from the horizontal pipe 8A between the closing plate 8E and the closing plate 8E.
Note that the hot water supply port 8S and the hot water discharge port 8R are cut into the same pipe material as that of the vertical pipe 8B to form a fusion communication form.

Further, the first heat radiating panel 81 and the second heat radiating panel 82 are integrated, as shown in FIGS. 5B and 5C, with the spacer pipe 8D between the upper and lower horizontal pipes 8A on the right end and the left end. Between the lower end horizontal pipes 8A, the center interval W8 'is 31.5 mm, the space (interval) GP between the opposing faces of both panels 81 and 82 is 18.5 mm, and only between the upper end horizontal pipes 8A at the left end. Is made a continuous water channel with the communication pipe 8C.
In this case, each horizontal pipe 8A and each vertical pipe 8B are made of polypropylene. random. A copolymer resin (PP-R resin) molded article is prepared by two-layer extrusion molding using a 0.5 mm-thick coating layer in which a desired pigment is mixed in the main body resin as the skin.
Further, the fusion work between the plastic pipes 8A and 8B may be performed by the fusion means disclosed in Japanese Patent Application Laid-Open No. 2007-247869.

Therefore, in the heat radiating portion in which the first heat radiating panel 81 and the second heat radiating panel 82 are integrated, as shown in FIG. 5, the heat flows in from the hot water supply port 8S connected to the forward pipe S in the heater unit box 1. In the first heat radiating panel 81, the hot water f1 flows leftward in the lower end horizontal pipe 8A f2 → upward flow f3 in the vertical pipe 8B group → leftward flow f4 in the upper end horizontal pipe 8A → communication pipe At 8C, a lateral flow f5 to the second heat radiating panel 82 is obtained, and in the second heat radiating panel 82, the downward flow f6 in the left vertical pipe 8B → the right flow f7 in the lower horizontal pipe 8A and the vertical pipe 8B group. Ascending flow f8 → rightward flow f9 in the upper end horizontal pipe 8A → downward flow f10 in the right end vertical pipe 8B → flow f11 from the hot water discharge port 8R to the return pipe R, the uniform circulation of all the panel surfaces It becomes possible.

[Frame material of heat radiation part (FIGS. 7, 8, and 9)]
As shown in FIGS. 1 and 2, the heat radiating section 8 constructed of the plastic pipes 8 </ b> A and 8 </ b> B is mounted and connected to the heater unit box 1 by holding the upper side horizontal pipe 8 </ b> A of the heat radiating section 8 with the upper frame 13. It is only necessary to connect both ends of the upper frame to the side frames 15 that function as support pillars on both sides with the upper joint 16 and to support and hold the lower ends of the side frames 15 with the heater unit box 1. The upper end is held by the upper frame 13 connected and supported on both side frames 15 having a column action, and the lower end is housed in the upper part of the heater unit box 1, and the extension strain due to the heating of the vertical pipes 8B is hindered. It can be absorbed without any problems.

[Upper frame 13 (FIGS. 7 and 8)]
The upper frame 13 is an upper covering material that extends over the entire length of the heat radiating portion 8 and is a member that suspends and holds the heat radiating portion 8, and FIG. 8A is a cross-sectional view of the upper frame.
As shown in FIG. 8A, the cross-sectional shape of the upper frame 13 has a width W13 of 68 mm, a height h13 of 39 mm, and is composed of an upper side 13T and a vertical side 13F on both sides. This is an extrusion molded product of a polycarbonate resin of a two-layer molding in which a colored coating layer having a thickness of 0.5 mm and a surface layer of 0.5 mm is formed.
As shown in FIG. 8A, the upper side 13T is provided with a notch 13A for placing an upper lid having a width W13 'of 31 mm. In the notch 13A, a thick section paragraph (standard: 1.5 mm) is formed from the upper side 13T. ) And the supporting piece 13U having a width of 5 mm protrudes inward from both sides and is brought into contact with the lateral pipe 8A on both sides via the falling piece 13C extending downward (standard: 10 mm). The curved surface abutting portion 13R and a bottom plate 13B extending between both curved surface abutting portions 13R are arranged, and the bottom plate 13B has an appropriately shaped air outflow hole H13 (standard: long hole having a width of 18 mm and a length of 154 mm). The perforation is appropriately arranged.

Further, the vertical side 13F on both sides of the upper frame protrudes from the lower end inside with a horizontal side 13D, a curved surface contact part 13R for making contact with the horizontal pipe 8A from obliquely below, and an inclined side 13S, and projecting a rigid hollow part 13G. Form.
Further, at both ends in the lengthwise direction of the upper frame 13, as shown in FIG. 7 (B), fitting holes H13 for fitting the protruding pieces 16E at the upper center of the upper joint 16 are fitted at both ends of the bottom plate 13B. As shown in FIG. 8A, fitting holes H13 ′ for fitting with the protruding pieces 16M of the upper joint 16 are formed at both ends of the inclined side 13S of the hollow portion 13G.

[Side Frame 15 (FIGS. 7 and 8)]
FIG. 7F shows an overall perspective view of the side frame 15, and FIG. 8B shows a cross section of the side frame. The side frame 15 has a column action for supporting the heat radiating portion 8. This is a two-layer extrusion molded product of polycarbonate resin having a trapezoidal square cross section, a general wall thickness of 1.5 mm, and a surface layer having a colored coating layer of 0.5 mm.
As shown in FIG. 8B, the cross-sectional shape is a trapezoidal square tube having a width W15 of 68 mm, the same width as the upper frame 13, and a thickness (depth) T15 of 20 mm. The outer vertical side 15D having a width of 42 mm is provided via the side vertical side 15A and the inclined side (standard: 45 ° inclination) 15S.
Further, as shown in FIG. 7F, the side frame 15 has a fitting hole H15 (standard: long) for engagement with the protrusion 16C of the insertion portion 16B of the upper connector 16 above the inner vertical side 15F. 20mm long horizontal hole).

[Upper connector 16 (FIGS. 7 and 9)]
The upper joint 16 is a member that connects the longitudinal end of the upper frame 13 to the side frame 15, FIG. 9 is an explanatory view of the upper joint, and (A) is a front view of the joint surface side, (B) is a top view, (C) is a longitudinal side view, and (D) is an explanatory diagram of a fitting state with the upper frame.
The upper joint 16 is a colored polycarbonate resin injection-molded product having a general thickness of 3 mm, and has a width W16 of 68 mm, the same width as the upper frame 13 and the side frame 15, and a length as shown in FIG. (Depth) T16 is 20 mm, the height is 59 mm, the height h16 ′ of the insertion portion 16B to be inserted into the side frame 15 is 20 mm, and the total height is 79 mm. As shown in FIG. 9C, the insertion portion 16B of h16 ′ has a half-thickness (1.5 mm) with a stepped surface, and is inserted into the side frame 15 to be flush with the surface of the side frame. .
Then, as shown in FIG. 9C, the inner vertical side 16F and the outer vertical side 16D are integrated by the upper side 16T and the upper side inclined side 16S, and the side surface is the inner vertical side as shown in FIG. 9B. 16F is connected to the outer vertical side 16D via the side vertical sides 16A and the inclined sides 16S on both sides.

Then, in the inner vertical side 16F of the upper connector 16, as shown in FIG. 9A, a protruding piece 16E having a locking piece 16E ′ at the tip is horizontally arranged in the upper center, and on both upper sides, Bending-shaped support pieces 16K for inscribed in the upper side 13T and the vertical side 13F of the upper frame 13 are disposed, and projecting pieces 16M each provided with a locking piece 16M ′ at the tip are provided at the middle portions on both sides. As shown in FIG. 9 (D), the locking piece 16M ′ is placed in the fitting hole H13 ′ of the hollow portion 13G of the upper frame 13, and the center portion of the insertion portion 16B is located above the side frame 15. The protrusion 16C is arranged so that it can be fitted into the fitting hole H15.

That is, as shown in FIG. 9 (D), the upper connector 16 is connected to the upper frame 13 in the fitting holes H13 "at both ends in the longitudinal direction of the bottom plate 13B in the notch 13A of the upper frame 13. The locking piece 16E ′ of the connector 16 is fitted, the projecting piece 16E contacts the lower surface of the upper frame bottom plate 13B, and the support piece 16K contacts the inner surface of the upper side 13T of the upper frame 13 to the inner surface of the vertical side 13F. Reinforcing, the overlapping protruding piece of the protruding piece 16M and the locking piece 16M ′ is inserted into the rigid hollow portion 13G on the lower inner surface of the vertical side 13F of the upper frame 13, and the locking piece 16M ′ is inserted into the fitting hole H13 ′. Is inserted, the projecting piece 16M comes into contact with the inner wall surface of the inclined side 13S of the hollow portion 13G, and the end portion of the upper frame 13 can be fitted with no play (sliding), as shown in FIG. 1 and FIG. At both ends of the heater HC, the upper frame 13, the upper connector 16, and the side frame 15 are aligned with each other. Is the dimension form that can be assembled of.

[Upper lid 18 (FIG. 8)]
FIG. 8D is a plan view of the upper lid 18, and FIG. 8C is a sectional view of a state where the upper lid 18 is placed on the upper frame 13.
The upper lid 18 is placed and fitted on a notch 13A provided vertically in the longitudinal direction of the upper side center of the upper frame 13, and is a colored plastic resin (polycarbonate resin) extrusion-molded product having a general wall thickness of 1.5 mm. 8D, the length L18 is 222 mm, the width W18 is 30 mm, and a long hole-shaped air hole Ha having a width of 3.5 mm and a length of 18 mm is formed at a constant interval (standard) in the center of the width. A plurality of (upper: 3 mm) upper lids 18 are arranged in a notch 13 </ b> A in one upper frame 13 in an extended form.

As shown in FIG. 8C, the cross-sectional shape of the upper lid 18 is such that the upper side 18T is provided with a bulging curved surface having the same curvature as the upper side 13T of the upper frame 13, and is a falling piece from both side positions of the air hole Ha group. 18F is hung with a height h18 of 4.5 mm, and the compatible falling piece 18F is provided with a locking claw 18G outside the lower end.
Therefore, as shown in FIG. 8C, if the upper lid 18 is placed and fitted on the support pieces 13U on both sides of the notch 13A of the upper frame 13, the upper lid upper side 18T has a curved surface that matches the upper frame upper side 13T. The engaging claw 18G at the lower end of the falling piece 18F engages with the lower surface of the support piece 13U on the upper end surface side of the upper frame to cover the bottom plate 13B of the upper frame 13, and the rising of the heated air from the upper frame 13 The design effect by the side edge lines of the upper lid 18 and the functional beauty by the orderly arranged air holes Ha are imparted to the upper surface of the upper frame while allowing the release.

[Assembling the heater (FIGS. 3, 7, 10)]
The assembly of the heater is an operation of assembling the heater unit box 1, devices, and piping, assembling the heat radiating section, and connecting the heat radiating section to the heater unit box, and is performed in the factory.
In this case, as shown in FIG. 10, in the heater unit box 1, the bottom plate 1C is placed in contact with the lower side 17B of the closure 17 on both sides, and the screw insertion hole H17 ′ on the lower side 17B of the closure and the screw of the bottom plate 1C are placed. A bolt b17 is inserted and tightened from below the lower side 17B of the closing tool 17 through the insertion hole H17 ', and the closing tool 17 on both sides and the bottom plate 1C are fixed.

Next, the side plate 1A (1B) on the side where the operation panel 9E is arranged is arranged on the integrated closing member 17 and the bottom plate 1C on both sides so as to cover the outer periphery of the closing member 17 and the bottom plate 1C.
In this case, first, the endothelial plate Pr is flushed with the anchor side 17A extending 15 mm inward to the obturator 17 on both sides, and the outer plate PR is covered with the anchor side 17A so as to cover the obturator 17. The vertical side 1f of the endothelial plate Pr is brought into contact with the rising piece 1P of the bottom plate 1C, and the vertical side 1F of the outer plate PR is covered with and brought into contact with the vertical side 1f of the endothelial plate Pr. A bolt b1 is used to fasten the screw insertion hole H3 of the rising piece 1P of the bottom plate 1C through the PR and the screw insertion hole H3 of the endothelial plate Pr.

10B, the lower side 1W of the outer skin plate PR is in contact with the lower surface of the screw insertion hole H2 formed in the horizontal side 1D of the bottom plate 1C, and a large diameter drop is made via the bolt b1. Fastened to the horizontal side 1D in the insertion hole H2 '.
Further, on the upper side of the outer skin plate PR, as shown in FIG. 10E, the upper side 1T of the outer skin plate PR extends to the anchor side 17A partially extending at both ends of the upper side of the closure 17 and having the screw insertion holes H17. The nut n17 is disposed at the lower end of the falling piece 17E disposed on the outer periphery of the screw insertion hole H17 on the anchor side 17A, and is firmly tightened with the bolt b17, and includes the outer skin plate PR and the inner skin plate Pr. The side plate 1A (1B) having a decorative plate effect, the bottom plate 1C, and the closing devices 17 at both ends are integrated.

Next, equipment and piping are arranged on the upper surface of the horizontal side 1D of the bottom plate 1C.
In this case, the air separation pressure tank 2 and the circulation pump 3 are fixed to the appropriate position on the upper surface of the bottom plate 1C by using a double-sided tape, and as shown in FIGS. 3 (A) and 3 (B), the air separation pressure tank 2, the upper side connection port J3 is closed with a rubber cap 2C, and a rubber pipe 5A is connected to the return pipe R from the front side connection port J1 of the air separation pressure tank 2 through the water filling joint 7 to the return pipe R, and the air separation pressure tank 2 is connected to a pipe P2 between the rear connection port J2 and one connection part 3J of the circulation pump 3, and the pipe P3 is connected to the other connection part 3J of the circulation pump 3 and the pipe heater 4, and the pipe heater 4 and the forward pipe S As for the piping in each device, the rubber pipe 5A may be tightened and connected with the hose band 5B (FIG. 2).
Then, electrical wiring is performed in the piping gap, the operation panel 9E is fitted to the side plate 1A (1B), and the electric wire plug 9G is drawn out from the electric wire insertion hole H9 of the closing tool 17 so as to be extendable.

Next, the heat radiating part 8 is suspended by the upper frame 13, and the heat radiating part 8 fitted and integrated with the side frame 15 by the upper joint 16 on both sides of the upper frame 13 is cut off by the side frame 15. It is inserted and fitted into the notch 17C from above, and the lower end of the side frame 15 is supported by the lower side 17B of the closing member 17, and is arranged at the upper part of the heater unit box 1, and the forward pipe S in the heater unit box 1 is disposed. Is connected to the hot water supply port 8S of the heat radiating section 8 and the return pipe R is connected to the hot water discharge port 8R of the heat radiating section 8.
In this case, the plastic upper frame 13 has the same length as the heat radiating portion 8 and, as shown in FIG. 8A, the upper curved contact portions 13R on both sides of the upper frame 13 and the lower curved contact surfaces. The portion 13R firmly holds the two horizontal pipes 8A at the upper end of the heat radiating portion over the entire length.

[Filling water into the system (Fig. 4)]
FIG. 4B is an explanatory diagram of the novel water-filled joint fitting 7, and FIG. 4C is a water-filling work explanatory diagram.
As shown in FIG. 4 (C), the water filling operation in the hot water circulation system is performed by connecting the screw insertion hole H7 ″ of the ball valve 7A and the water tap 6A with the pressure hose 6C, and the screw insertion hole H7 of the ball valve 7C. Connect one end of the transparent hose 6D to the water, lift the other end of the transparent hose 6D into the water of the bucket 6B, and lift the transparent hose 6D up to the water pressure application position 6E to apply the set water pressure (standard: 1 m) The gate valve 7B of the watertight fitting 7 is closed by turning the screwdriver into the screw insertion hole H7, opening the ball valves 7A and 7C, and opening the water tap 6A. Fill the circulation system with water at tap pressure (standard: 0.5 Mpa).

In this case, water is discharged into the bucket 6B together with air, bubbles can be visually observed with the transparent hose 6D, and bubbles can be confirmed from the surface of the water with the bucket 6B.
And if the discharge of air in the system (air → water replacement) is confirmed and the water tap 6A and the ball valve 7A are closed, the water supply is stopped and the pressure becomes zero, and the head held by the transparent hose 6D The filling water in the system has an initial pressure of 0.01 Mpa.
After filling the system with water at a predetermined initial pressure, the ball valves 7A and 7C are closed, the gate valve 7B is opened, the pressure hose 6C and the transparent hose 6D are removed, and the other side plate 1B (1A) is closed. If the cover 17 is fastened to the tool 17 and the upper lid 18 is fitted onto the upper frame 13, a finished product is obtained.

Accordingly, the closed circulation system of the present invention drains water and ventilates air during production, so that maintenance and inspection are not required even during continuous operation for a long time, and a maintenance-free plastic heater is obtained.
Even if a failure occurs in the system, it is sufficient to remove one of the side plates 1A (1B) of the heater unit box and inspect, repair, or replace the heater unit box.

The hot-water circulating heater HC of the present invention obtained in the example is an epoch-making all-plastic heater in a residential heater.
And under the guidance of the testing method at the Hokkaido Industrial Experiment Station and the Environment and Energy Department Measurement Room, the performance was compared under the same conditions (1.2 kW) with the oil heater of Delonghi (Denmark). It was as shown in the table.

Panel surface temperature Surface radiation temperature Heat dissipation
Plastic heater 48.8 ° C 28.7 ° C 472w / m ² 　
Oil heater 71.7 ° C 24.8 ° C 447 w / m ² 　

As is apparent from the above comparative test, the plastic heater of the present invention has a low heat radiation panel surface temperature, but has a high surface radiation temperature and a high heat radiation amount, and thus has no fear of burns.

And in the comparison of the average electric energy for 1.5 hours from the start of operation, the plastic heater is 1.172 kW, the thermal efficiency is 97.6%, the oil heater is 1.002 kW, and the thermal efficiency is 85.1%. There was also a significant difference in terms of thermal efficiency.
In addition, when the capacity test was performed on the plastic heater at 1500 w (H19.6.18), the water temperature of the hot water supply port 8S flowed in at 70.8 ° C, and the water temperature of the hot water discharge port 8R reached 63.3 ° C. Although the temperature decreased by 7.5 ° C., the amount of temperature decrease is indoor heat dissipation.
And the flow volume of the hot water circulation heating system of this invention was 2.0 liter / min, and the temperature difference of an entrance and exit was 9.5 degreeC (standard: 10 degreeC) and was highly efficient.

Further, the plastic heater HC has a weight of the heat radiation part 8 (including the weight of the water of the heat medium) of 2.7 kg, the weight of the heater unit box 1 is 5.1 kg, and a total weight of 7.8 kg, and The weight ratio of the upper part (heat radiation part) and the lower part (heater unit box) is 35%: 65%, so there is little fear of falling.
Further, when comparing the flow resistance in the pipe between the heat radiating portion 8 of the plastic heater of the present invention and the conventional plastic heat radiating portion (disclosed in FIG. 5 of JP 2007-247869 A), the heat radiating portion 8 of the present invention is compared. The internal resistance of the pipe is 0.09 mmAg / m. The conventional plastic heat radiation part (A) type (one pipe bent parallel) is 6.7 mmAg / m, and the (B) type is 0.34 mmAg. / M, (C) type was 3.36 mmAg / m.
Therefore, the plastic heater HC of the present invention is an energy-saving heater that can adopt a small circulation pump because the flowing water in the heat radiating section 8 flows smoothly, and has good thermal efficiency.

Claims (9)

1. An electric heating type hot water circulation heater in which the upper heat radiating part (8) is integrated with the lower heater unit box (1), and the heat radiating part (8) has a hot water supply port (8S) and a hot water discharge port (8R) is a hot water circulation heat dissipating panel, the panel surface is exposed, and the heater unit box (1) is composed of a water fitting joint fitting (7), an air separation pressure tank (2), a circulation pump (3) The pipe heater (4) is connected to the pipe to store the hot water circulation function part, and the heat pipe (S) and return pipe (R) are connected to the heat radiating part (8). A hot water circulation heater that can be pulled out freely.
2. The heat dissipating part (8) connects the plastic small-diameter vertical pipes (8B) to the upper and lower plastic large-diameter horizontal pipes (8A), and connects the lower-end horizontal pipe (8A) to the hot water supply port (8S). ) And a hot water circulation heater according to claim 1, which is a plastic resin heat dissipating panel (81, 82) provided with a hot water discharge port (8R).
3. The heat dissipating part (8) integrates the first heat dissipating panel (81) and the second heat dissipating panel (82) so that the opposing surface interval (GP) allows the upward flow of only heated air to be integrated. A hot water supply port (8S) is provided at one lower end of the lower end horizontal pipe (8A) of the panel (81), and a hot water discharge port is provided at one lower end of the lower end horizontal pipe (8A) of the second heat radiating panel (82). The hot water circulation heater according to claim 2, wherein (8R) is arranged.
4. The hot water circulating heater according to claim 2 or 3, wherein all of the horizontal pipe (8A) and the vertical pipe (8B) of the heat dissipating panel (81, 82) are two-layer molded plastic pipes having a coating layer on the surface. .
5. The heater unit box (1) is fastened to both ends of the bottom plate (1C) in the longitudinal direction by attaching a closing device (17) having a vertical notch (17C) to the outer surface of the outer end plate (17S). The left side plate (1A) and the right side plate (1B) are detachably fixed to the bottom plate (1C) and the closing member (17) in such a manner as to cover the bottom plate (1C) and the closing member (17) to dissipate heat. The upper end horizontal pipe (8A) of the upper part (8A) of the part (8) is suspended from the longitudinal direction both ends of the upper frame (13) and the upper and lower side frames (15) connected via the upper connector (16). 17. The hot water circulation heater according to claim 2, wherein the hot water circulation heater is fitted into the notch (17 </ b> C) of 17) from above, and the lower end of the side frame (15) is supported by the closing tool (17).
6. The upper frame (13) is provided with a notch (13A) in the longitudinal direction on the upper side (13T), and at the lower part of the notch (13A), curved contact portions (13R) on both sides and a central air outflow hole (H13). ), A rigid hollow portion (13G) having a curved contact portion (13R) is disposed inside the lower ends of the vertical sides (13F) on both sides, and the upper lid (18) The air hole (Ha) group is aligned and arranged at the center of the width, and the falling pieces (18F) provided with the locking claws (18G) protrude downward from both sides of the air hole (Ha) group, and the upper lid (18) is The hot water circulation heater according to claim 5, wherein the upper frame (13) is detachably fitted to the notch (13A) via the falling piece (18F).
7. Upper frame (13), upper lid (18), upper joint (16), side frame (15), left side plate (1A), right side plate (1B) and closing device (17) constituting the framework of the heater (HC) ) Are all made of plastic, the extrusion molded product has a coating layer on the surface, the injection molded product is made of pigment-mixed resin, and the left side plate (1A) and the right side plate (1B) are the outer skin plates (PR). The hot water circulation heater according to claim 5 or 6, wherein the hot water circulation heater is a laminated plate of an endothelial plate (Pr).
8. The water-filled joint fitting (7) has pipe hose nipple parts (7J) for both ends of the pipe part (7T), and a partition for opening and closing the water channel of the pipe part (7T) from the center of the pipe part (7T). The valve (7B) protrudes, the connecting part (7D) protrudes on both sides of the gate valve (7B), the ball valve (7A, 7C) is detachably screwed to each connecting part (7D), and the heater unit box (1) The hot water circulation heater according to any one of claims 1 to 7, wherein the hot water circulation heater is arranged in a piping path in the inside.
9. The air separation pressure tank (2) includes a lower side (2D), a front side (2F), a rear side (2B), an upper side (2T), and both sides (2L, 2R), and the upper side (2T) It has a box shape that is continuous with the front side (2F) at the inclined side (Sf) and the rear side (2B) at the rear side inclined side (Sb), and has a connection port ( J1) is provided with a connection port (J2) at the middle in the vertical direction of the rear side (2B) and a connection port (J3) at the rear part of the upper side (2T), and extends between both sides (2L, 2R). The two blades (2A, 2A ') that are inclined and raised rearward are arranged so that the front blade (2A) is in the rear corresponding position of the connection port (J1) of the front side (2F). ) Is located above the front blade (2A) and below the upper side connection port (J3), and the front connection port (J1) is connected to the return pipe (R) side and the rear side connection port. The hot water circulating heater according to any one of claims 1 to 8, wherein the connecting port (J2) is connected to the circulating pump (3) side by piping, and the upper connecting port (J3) is closed by a rubber cap (2C).

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