JP6405250B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type hot water heater in which a temperature detector and a heat insulating material are provided on the outer peripheral portion of a can body for storing hot water for hot water supply.

  Conventionally, in this type of hot water storage type water heater, as described in Patent Document 1, a temperature detector for detecting the temperature of hot water stored in the can body at the outer peripheral portion of the can body, There was what provided the heat insulating material (foaming heat insulating material and vacuum heat insulating material) for preventing the temperature fall by heat dissipation of a can.

Japanese Patent No. 4924054

  By the way, in this conventional one, a foam molded heat insulating material is provided in a part of the circumferential direction with respect to the outer peripheral portion of the can body, a vacuum heat insulating material is wound around the installation location, and the temperature detector is made into the foam molded heat insulating material. Provided. Here, since the heat insulation performance of the vacuum heat insulating material is higher than that of the foam-molded heat insulating material, for example, a configuration in which the vacuum heat insulating material is wound over almost the entire circumference of the outer peripheral portion of the can body is also conceivable. In this case, for example, a plurality of vacuum heat insulating materials each having a substantially arc-shaped cross section (in other words, each having a partial cylindrical surface) are arranged so as to cover the outer peripheral portion of the can body. And a temperature detector will be provided between the outer surface of a can body and the inner surface of a vacuum heat insulating material.

  In order to ensure high detection accuracy by the temperature detector, it is preferable that the temperature detector is brought into close contact with the outer surface of the can body as much as possible. Here, generally known vacuum heat insulating materials are often manufactured by bending a flat plate-shaped heat insulating material piece base material into a substantially circular arc cross section by an appropriate method. In the case of using the thus manufactured vacuum heat insulating material piece, even if the vacuum heat insulating material piece is arranged so as to cover the outer peripheral portion of the can body in the bent state, the material and then the original There may be a case where a restoring force is exerted to return to the flat plate shape. When such a restoring force acts, there is a tendency that a gap is formed between the inner surface of the vacuum heat insulating material piece and the outer surface of the can body, and thus, as described above, between the vacuum heat insulating material piece and the can body. There was a problem that the degree of adhesion of the arranged temperature detector to the outer surface of the can body was lowered and the detection accuracy was lowered.

  In order to solve the above problem, in claim 1 of the present invention, a substantially cylindrical can body that stores hot water heated by a heating means inside, and a temperature attached to a radially outer surface of the can body. A detector, and at least one vacuum heat insulating piece provided to cover at least a part of the radially outer peripheral portion of the can body by bending a flat plate-shaped heat insulating base material into a substantially arc-shaped cross section; In the hot water storage type hot water heater, the flat plate-like shape is provided so as to cover a radially outer peripheral portion of the vacuum heat insulating material piece having a substantially arc-shaped cross section, and presses the vacuum heat insulating material piece radially inward. Having at least one foam heat insulating material piece forbidden to be restored to, and causing the pressure inward in the radial direction by the foam heat insulating material piece to act on the temperature detection tool via the vacuum heat insulating material piece, The detection tool is in close contact with the can body.

  According to a second aspect of the present invention, the temperature detector is a thermistor that can detect temperatures in all directions.

  According to a third aspect of the present invention, the thermistor is arranged so as to be pressed against the substantially central portion in the circumferential direction of the one vacuum heat insulating material piece having a substantially arc-shaped cross section.

  Moreover, in Claim 4, it has a fixing tool (tape) which fixes the circumferential direction both ends of the said one vacuum heat insulating material piece which presses the said thermistor in the said circumferential direction substantially center part to the said can body. .

  According to the first aspect of the present invention, at least one heat insulating vacuum heat insulating piece is provided on the radially outer peripheral portion of the substantially cylindrical can body for storing hot water therein. At this time, a temperature detector for detecting the temperature of the hot water in the can body is attached to the outer surface of the can body (in other words, between the vacuum heat insulating material piece and the can body).

  Here, in claim 1, as described above, the vacuum heat insulating material piece is manufactured by bending a flat heat insulating material base material into a substantially circular arc cross section by an appropriate method. Then, the foam heat insulating material piece is provided so as to cover the radially outer peripheral portion of the vacuum heat insulating material piece. Thereby, a vacuum heat insulating material piece is pressed to radial inside, and the restoration | restoration to the said flat form shape is prohibited. Further, by applying the pressing force at that time to the temperature detector (via the vacuum heat insulating material piece), the pressure is brought into close contact with the can body. Thereby, the fall of the said adhesion degree can be prevented and the detection accuracy of a temperature detection tool can be improved.

  Further, in the case of an omnidirectional detection type thermistor, if there is an air layer around the thermistor, the temperature of the air is detected. As a result, the accuracy of detecting the temperature of the hot water inside the can body is particularly likely to decrease. . Therefore, according to claim 2, by applying the pressing force of the foam heat insulating material piece to the thermistor through the vacuum heat insulating material piece as described above, the space that can be generated around the thermistor is crushed and the air layer is eliminated. Can do. As a result, the detection accuracy can be further improved.

  According to claim 3, the thermistor can be reliably pressed by the substantially central portion in the circumferential direction of the substantially arc-shaped vacuum heat insulating material piece, and the detection accuracy can be improved.

  According to the fourth aspect of the present invention, both ends in the circumferential direction of the substantially arc-shaped vacuum heat insulating material piece are firmly fixed to the can body with the fixture, so that the pressing force to the thermistor from the substantially central portion in the circumferential direction can be surely obtained. Can act on the thermistor.

1 is an overall schematic configuration diagram of a hot water storage type water heater according to an embodiment of the present invention. Exploded perspective view showing details of can and surrounding structure Explanatory drawing showing the roll processing equipment at the time of manufacture of a vacuum heat insulating material piece A schematic side view corresponding to an arrow view from the direction of arrow IV in FIG. 2 and IVb in FIG. 4 (a), showing the attachment state of the thermistor and the vacuum heat insulating material piece to the outside in the radial direction of the can body Schematic cross-sectional view by -IVb cross section A schematic cross-sectional view showing a state where the vacuum heat insulating material piece is deformed or opened by a restoring force. Schematic cross-sectional view with a cross section equivalent to that of FIG. 4B in the configuration of the embodiment shown in FIG. Schematic cross-sectional view showing a modification without using metal tape

  Next, an embodiment of the present invention will be described with reference to FIGS.

  An overall schematic configuration of a hot water storage type hot water supply apparatus including the hot water storage type hot water supply apparatus of the present embodiment is shown in FIG. In FIG. 1, this hot water storage type hot water supply apparatus 100 is a device for boiling hot water and storing hot water in the midnight hours when the unit price of contracted electric power by time zone is low, and using the hot water stored in the hot water for hot water supply. A hot water storage tank unit 1 provided with a body 2 (hot water storage tank), a heat pump unit 3 as a heating means for heating hot water in the can body 2, a hot water tap 4 provided in a kitchen, a washroom, etc., for example, hot water supply A hot water supply remote controller 5 provided in the vicinity of the stopper 4 and a bathtub 6 are provided.

  The hot water storage tank unit 1 is connected to the can body 2 installed inside an exterior case (not shown) serving as a housing, a hot water pipe 12 connected to the upper portion of the can body 2, and a lower portion of the can body 2. The mixing water supply pipe 13, the mixing valve 15 for mixing the high temperature water from the hot water supply pipe 12 and the low temperature water from the bypass pipe 14 branched from the water supply pipe 13, and the hot water supply pipe 16 connected downstream of the mixing valve 15. A hot water filling pipe 20 branched from the hot water supply pipe 16 and connected to the bathtub 6, a hot water filling valve 21 for opening and closing the hot water filling pipe 20, and an overpressure of the can body 2 connected to branch from the hot water discharge pipe 12. An overpressure relief valve 23 for releasing water, a hot water supply temperature sensor 17 provided in the hot water supply pipe 16, a hot water supply flow rate sensor 18 provided in the hot water supply pipe 16, and a pressure reducing valve 24 for reducing the supply water pressure provided in the water supply pipe 13. And a water supply temperature sensor provided in the water supply pipe 13 With 9, a hot water filling flow sensor 22 integrates the flow rate through the water filling pipe 20, and a hot water supply control unit 25 for controlling the various devices in the hot water storage tank unit 1 includes a microcomputer.

  In the can body 2, a plurality of thermistors 29 are arranged along the vertical direction. Based on the temperature information detected by these thermistors 29, it is detected how much heat is left in the can body 2, and further the temperature distribution in the vertical direction in the can body 2 is detected. The configurations of the can body 2 and the thermistor 29 will be described in detail later.

  The can body 2 and the heat pump unit 3 are connected to each other by a heating circulation circuit 28 including a heat pump forward pipe 26 and a heat pump return pipe 27 for circulating hot water. The heat pump unit 3 includes a heat pump circuit 34, a heat pump circulation pump 36, and a heat pump control unit 39 that controls driving of the heat pump circuit 34. The heat pump circuit 34 includes a compressor 30 that compresses carbon dioxide refrigerant, a refrigerant-water heat exchanger 31 as a condenser, an electronic expansion valve 32, and a forced air-cooled evaporator 33. A heat entrance temperature sensor 37 for detecting the temperature of hot water flowing into the refrigerant-water heat exchanger 31 is provided on the inlet side of the refrigerant-water heat exchanger 31 of the heating circuit 28. On the outlet side of the water heat exchanger 31, a heat exchange outlet temperature sensor 38 that detects the temperature of hot water flowing out from the refrigerant-water heat exchanger 31 is provided.

  The hot water supply remote controller 5 is set with a hot water supply temperature setting switch 40 for setting a hot water supply set temperature, a bath temperature setting switch 42 for setting a bath set temperature, and hot water at the bath set temperature by a hot water filling amount setting switch 41. A bath automatic switch 43 that fills the bathtub 6 by the amount of hot water and keeps it warm for a predetermined time, a display unit 45 that displays an appropriate display, and a remote control unit that includes a microcomputer and communicates with the hot water supply control unit 25 (not shown). And).

  Next, the details of the can 2 and the surrounding structure will be described with reference to FIG. In addition, in order to avoid the complexity of illustration, the various pipes connected to the can 2 and the outer case are omitted. In FIG. 2, the can body 2 is a metal hollow can that is formed in a substantially cylindrical shape as a whole, and two vacuum heat insulating material pieces that cover the outer periphery in the radial direction of the can body 2 over almost the entire circumference. 52, four vacuum heat insulating material pieces 53, 54, 55, 56 covering the entire can body 2 including the vacuum heat insulating material piece 52 and the thermistor 29 described later, and the foam heat insulating material pieces 53 to 56. And a base portion 57 on which the can body 2 is placed.

  The vacuum heat insulating material piece 52 is a structure in which, for example, glass wool is filled as a core material inside a bag body of an aluminum film, and is made into a substantially vacuum state. The whole is formed in a substantially semi-cylindrical shape (substantially arcuate in cross section). In the example shown in the figure, the two vacuum heat insulating material pieces 52 cover a substantially 180 ° range (a total range of approximately 360 ° total circumference) facing each other with respect to the radially outer surface of the can body 2. Both ends in the circumferential direction of each vacuum heat insulating material piece 52 are fixed to the can body 2 by a fixing tape 59 as a fixing tool made of, for example, a polypropylene film (only one is shown in FIG. 2 for the purpose of preventing complications).

  An example of the manufacturing method of the vacuum heat insulating material piece 52 will be described with reference to FIG. As described above, the vacuum heat insulating material piece 52 is manufactured by rolling a flat heat insulating material base material. That is, as shown in FIG. 3, one upper roller 63 is disposed above the two lower rollers 61 and 62 in the processing equipment for performing this roll processing. The heat insulating base material 52 ′ having a flat plate shape (not shown) is inserted through two gaps between the upper roller 63 and the lower rollers 61 and 62. Thereafter, the upper roller 63 is moved downward to press the heat insulating base material 52 '(see the white arrow), and the rollers 61, 62, 63 are rotated to convey the vacuum heat insulating piece 52 (see the arrow). Thus, it is possible to obtain the vacuum heat insulating material piece 52 that is curved in the shape of a substantially circular arc in cross section by bending the heat insulating material base material 52 '.

  The foam insulation pieces 53 to 56 are molded articles made of a material having mechanical rigidity (for example, heat-resistant foamed polystyrene), and are formed into a substantially hemispherical shape so as to cover the upper surface of the can body 2. A piece 53, a lower foam insulation material piece 54 formed in a substantially hemispherical shape so as to cover the lower surface of the can body 2, and a 180 ° range facing the radially outer surface of the can body 2 respectively. It includes two side foam insulation pieces 55 and 56 formed in a substantially semi-cylindrical shape. In the drawing, the lower foam heat insulating material piece 54 is provided integrally with the base portion 57. The inner diameters of the two side foam insulation pieces 55 and 56 are set to be substantially the same as the outer diameter of the vacuum insulation piece 52 covering the outer peripheral surface of the can body 2, and the foam insulation The material pieces 55 and 56 cover the radially outer peripheral portions of the two vacuum heat insulating material pieces 52 over almost the entire circumference.

In the hot water storage type hot water supply apparatus 100 having the above basic configuration, as shown in FIG. It is arranged in a line in the vertical direction. The thermistor 29, for example, is entirely covered with resin and has a diameter of about 3 mm, and can detect temperatures in all directions (that is, in the direction of 360 degrees around). Each of the five thermistors 29 is affixed and fixed to the radially outer surface of the can body 2 so as to be covered with a metal tape 58 (shown schematically by broken lines in FIG. 2). The vacuum heat insulating material piece 52 is fixed to the can body 2 by the adhesive tape 59 while covering the outer surface of the can body 2 with the thermistor 29 attached in this manner.

  Next, the attachment state of the thermistor 29 and the vacuum heat insulating material piece 52 to the radially outer side of the can body 2 will be described with reference to FIGS. 4 (a) and 4 (b). Note that members other than the can 2, the vacuum heat insulating material piece 52, and the thermistor 29 are omitted in order to avoid the complexity of the illustration.

  In FIG. 4A and FIG. 2, two vacuum heat insulating material pieces 52 are disposed over the entire circumference on the radially outer peripheral portion of the can body 2. At this time, the five thermistors 29 arranged in the vertical direction on the radially outer surface of the can body 2, as shown in FIG. 4 (b), the radially inner surface of the vacuum heat insulating material piece 52 and the can body 2. It arrange | positions so that it may be pinched | interposed between the outer surfaces of. Specifically, of the two vacuum heat insulating material pieces 52 shown on the left and right in FIGS. 4A and 4B, the periphery of the vacuum heat insulating material piece 52 having a substantially arc-shaped cross section shown on the right side in the drawing. It arrange | positions between the radial direction inner surface of the direction center part, and the radial direction outer surface of the said can 2.

  Here, in this embodiment, as described above, the vacuum heat insulating material piece 52 is obtained by bending a flat heat insulating material base material 52 'into a substantially circular arc shape (substantially semi-cylindrical shape) by roll processing. It has been produced. In this case, even if the vacuum heat insulating material piece 52 is disposed so as to cover the outer peripheral portion of the can body 2 in the bent state, on the material filled with glass wool as a core material as described above, There is a case where a restoring force to return to the original flat plate shape is applied. When such a restoring force is applied, the entire vacuum heat insulating material piece 52 is deformed (the radius of curvature is changed) as shown in FIG. 5A corresponding to FIG. As shown in FIG. 5B, the fixing tape 59 at the circumferential end may be peeled off and opened. In these cases, since the gap S tends to be vacant between the vacuum heat insulating material piece 52 and the outer peripheral portion of the can body 2, it is arranged between the vacuum heat insulating material piece 52 and the can body 2 as described above. The degree of adhesion of the thermistor 29 thus made to the radially outer surface of the can body 2 is reduced. Generally, in order to ensure high detection accuracy by the thermistor 29, it is preferable that the thermistor 29 is closely attached to the outer surface of the can body 2 as much as possible. Therefore, when the contact degree is reduced as described above, the detection accuracy of the thermistor 29 is lowered. There is a risk.

  In this embodiment, as shown in FIG. 6 corresponding to FIG. 4B (a cross-sectional view in a cross section equivalent to FIG. 4B of the configuration of the embodiment shown in FIG. 2), two vacuum insulations By providing the side foam heat insulating material pieces 55 and 56 so as to cover the radially outer peripheral portion of the material piece 52, each vacuum heat insulating material piece 52 is pressed inward in the radial direction, and restoration to the flat plate shape is prohibited. (Refer to the white arrow). Further, the thermistor 29 is brought into close contact with the can body 2 by applying the pressing force at that time to the thermistor 29 (via the vacuum heat insulating material piece 52). In addition, this is a molded product made of a material in which the foam heat insulating material pieces 53 to 56 have appropriate hardness and rigidity (heat-resistant foamed polystyrene in the example of the present embodiment), and the mechanical performance for maintaining the shape is vacuum. This is realized by being higher than the heat insulating material piece 52. Thereby, the detection accuracy of the thermistor 29 can be improved.

  In addition, in the above, the vacuum heat insulating material piece 52 was pressed by the two side foam heat insulating material pieces 55, 56. However, the invention is not limited to this, and it may be pressed using three or more foam heat insulating material pieces, For example, you may press using one foam heat insulating material piece provided with cross-sectional shape, such as (omega) shape. Also, the vacuum heat insulating material pieces 52 to be pressed are not limited to two as described above, but may be three or more, and one vacuum heat insulating material piece having a cross-sectional shape such as an Ω shape, for example. It may be.

  As described above, according to the hot water storage tank unit 1 of the present embodiment, the vacuum heat insulating material piece 52 is pressed radially inward by the side foam heat insulating material pieces 55 and 56 to restore the flat plate shape. The pressing force at that time is applied to the thermistor 29 so as to be in close contact with the can body 2. Thereby, the fall of the said adhesion degree can be prevented and the detection accuracy of the thermistor 29 can be improved. And the side foam insulation 55,56 piece itself which suppresses a restoring force with respect to the vacuum insulation piece 52 and adds a pressing force in this way has the heat insulation performance, and increases the number of parts uselessly. The heat retention performance of the entire can body 2 can be improved without causing it.

  In the embodiment, in particular, the thermistor 29 is configured to detect temperatures in all directions. As described above, when the thermistor 29 is an omnidirectional detection type, if there is an air layer around the thermistor 29, the temperature of the air is detected. As a result, the temperature of the hot water in the can 2 is detected accurately. It is particularly easy to decrease. Therefore, according to the present embodiment, the space that can be generated around the thermistor 29 by applying the pressing force of the side foam insulating material pieces 55 and 56 to the thermistor 29 via the vacuum heat insulating material piece 52 as described above. Can be crushed to eliminate the air layer as much as possible. As a result, the detection accuracy can be further improved.

  Further, particularly in the embodiment, the thermistor 29 is disposed so as to be pressed to the substantially central portion in the circumferential direction of one vacuum heat insulating material piece 52 having a substantially arc-shaped cross section. Thereby, the thermistor 29 can be reliably pressed by the substantially center part of the circumferential direction of the vacuum heat insulating material piece 52 extended in a substantially circular arc shape, and detection accuracy can be improved.

  In the embodiment, in particular, a fixing tape 59 is provided to fix both ends in the circumferential direction of the one vacuum heat insulating material piece 52 pressing the thermistor 29 at the substantially central portion in the circumferential direction to the can body 2. In this way, both ends in the circumferential direction of the substantially arc-shaped vacuum heat insulating material piece 52 are firmly fixed to the can body 2 with the fixing tape 59, so that the pressing force is reliably applied to the thermistor 29 from the substantially central portion in the circumferential direction. Can act.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not change the summary of invention. For example, as shown in FIG. 7 corresponding to FIG. 4B, the vacuum heat insulating material piece 52 may directly press the thermistor 29 and adhere to the can body 2 without using the metal tape 58. Even in this case, if the pressing force from the side foam heat insulating material pieces 55 and 56 is sufficient, the effect of improving the detection accuracy can be obtained while fixing the thermistor 29 to the can body 2 as in the above embodiment. is there.

  Moreover, in the said embodiment, although the foam heat insulating material pieces 53-56 made the heat-resistant foam polystyrene as a material, it is not restricted to this. That is, you may use the molded article of the material which has the same heat retention performance, mechanical hardness, and rigidity as a foam heat insulating material piece. In this case, the same effect as that of the embodiment can be obtained.

  Moreover, although the said embodiment demonstrated as an example the case where a heating means was comprised with the heat pump unit 3, it is not restricted to this. That is, a hot water heater using solar heat, gas or liquid fuel, an electric water heater using an electric heater, a waste heat recovery device of a cogeneration system, or the like may be used as the heating means.

1 Hot water storage tank unit (hot water storage water heater)
2 Can body 3 Heat pump unit (heating means)
4 Hot-water tap 6 Bathtub 12 Hot water pipe 13 Water supply pipe 29 Thermistor (temperature detector)
52 Vacuum insulation material piece 55, 56 Side foam insulation material piece (foam insulation material piece)
59 Fixing tape (fixture)
100 Hot water storage water heater

Claims (4)

A substantially cylindrical can that stores hot water heated by a heating means;
A temperature detector attached to the radially outer surface of the can body;
A plate-shaped heat insulating material base material bent into a substantially arcuate cross section, and at least one vacuum heat insulating material piece provided to cover at least a part of the radially outer periphery of the can body;
In the hot water storage type water heater having
At least one that is provided so as to cover a radially outer peripheral portion of the vacuum heat insulating material piece having a substantially arc-shaped cross section, and that inhibits the restoration to the flat plate shape by pressing the vacuum heat insulating material piece radially inward. Having foam insulation pieces,
A hot water storage type characterized in that the pressure inward in the radial direction by the foam heat insulating material piece is applied to the temperature detection tool through the vacuum heat insulating material piece, and the temperature detection tool is brought into close contact with the can body. Water heater. The hot water storage type hot water heater according to claim 1, wherein the temperature detector is a thermistor capable of detecting the temperature in all directions. The thermistor is
The hot water storage type hot water heater according to claim 2, wherein the hot water heater is arranged so as to be pressed to a substantially central portion in a circumferential direction of the one vacuum heat insulating material piece having a substantially circular arc cross section. The hot water storage type hot water supply according to claim 3, further comprising a fixture for fixing both end portions in the circumferential direction of the one vacuum heat insulating material piece pressing the thermistor at the substantially central portion in the circumferential direction. Machine.

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