JP2015167883A - Strainer device and hot water heating system - Google Patents

Abstract

In a strainer device having a mesh filter that captures foreign matters such as dust and impurities, a calcium component dissolved in circulating water of a hot water unit can be removed.
In a strainer device having a mesh filter that captures foreign matters such as dust and impurities contained in circulating water in a hot water circulation path, at least the circulating water flowing in the strainer device is heated to 60 ° C. or higher. And the precipitation electric heater for depositing and removing the calcium component which melt | dissolves in water is provided.
[Selection] Figure 2

Description

  The present invention relates to a strainer device that removes foreign matters such as dust and impurities contained in circulating water of a hot water circulation path in a hot water unit, and more specifically, it can also remove calcium components dissolved in circulating water. The present invention relates to a strainer device.

  Recently, a hot water heater using a heat pump unit as a heat source has been proposed in place of a combustion hot water heater using fossil fuels such as oil and gas. As an example, for example, Patent Document 1 discloses that hot water is generated by exchanging heat with a hot water unit via a water-refrigerant heat exchanger using a heat pump unit as a heat source, and the hot water is generated in the hot water circulation path. A heat pump type hot water heating apparatus has been proposed that circulates in the water and radiates heat with a hot water supply tank or floor heater.

According to the heat pump type hot water heating apparatus described in Patent Document 1, since the heat pump unit is used as a heat source, an accident such as a fire hardly occurs, and the amount of CO ₂ emission is small, so that it is friendly to the global environment. Moreover, since the drive control of the heat pump unit can be set finely, the set temperature of the hot water can be set widely from a low temperature to a high temperature.

  By the way, this type of hot water heater uses water as a heat medium, and a strainer device for removing foreign matters such as dust and impurities contained in the water is provided in the hot water circulation path of the hot water unit. It has been incorporated.

  As an example, Patent Document 2 discloses a strainer device in which a permanent magnet is housed in a mesh filter in which a fine mesh screen is formed in a cylindrical shape and is incorporated in a hot water circulation path of a hot water unit.

  According to this strainer device, when a foreign material flowing in the hot water circulation path is captured by the mesh filter and a magnetic material such as a metal piece peeled off from the pipe or the like is floating in the water, the magnetic material is removed. It can be adsorbed by a permanent magnet.

In addition, since tap water is usually used as circulating water in the hot water circulation path, a calcium component (calcium hydrogen carbonate: Ca (HCO ₃ ) ₂ ) is dissolved in the circulating water. When the water temperature exceeds 60 ° C., the calcium component precipitates as calcium carbonate: CaCO ₃ and adheres to the tube wall and the like.

  The precipitated calcium carbonate is called a scale (also called scale), and the scale is likely to adhere because the heat exchanger is particularly hot and its path length is long. When the amount of scale attached increases over a long period of use, there is a concern that the heat exchange efficiency may be lowered, or in the worst case, the tube may be blocked. In addition, there is a risk of adversely affecting sensors that detect pressure, water temperature, and the like.

  However, in the above-described conventional strainer device, even though the mesh body and the permanent magnet can remove the magnetic material such as the foreign matter and metal pieces flowing in the pipe, the size is as small as a micron size and further has magnetism. It was difficult to capture and remove calcium carbonate.

JP 2013-185803 A JP 2010-279887 A

  Then, the subject of this invention is providing the strainer apparatus which can also remove the calcium component currently melt | dissolved in the circulating water of a warm water unit in the strainer apparatus which has a mesh filter which captures foreign materials, such as a dust and an impurity. .

  In order to solve the above-described problems, the present invention provides a strainer device having a mesh filter that captures foreign matters such as dust and impurities contained in circulating water in a hot water circulation path, and heats the circulating water to 60 ° C. or higher. And it has the electric heater for precipitation for depositing and removing the calcium component which melt | dissolves in water, It is characterized by the above-mentioned.

  In a more preferred embodiment, the deposition electric heater is composed of a heating wire wired to the mesh filter.

  Further, an electromagnet composed of an iron core and an electromagnetic coil is further provided as a magnetic body adsorbing means for magnetically adsorbing the magnetic body contained in the circulating water. As a more preferable aspect, the electromagnetic coil of the electromagnet also serves as the heating wire of the deposition electric heater.

  The present invention also includes a hot water heater provided with this strainer device. A hot water unit having a hot water circuit, a heat pump unit as a heat source for heating the circulating water in the hot water circuit to a predetermined temperature, and a heating unit having a heat dissipation circuit included in a part of the hot water circuit. In the hot water heating apparatus, the strainer device of the present invention and a circulation pump for circulating the circulating water in the hot water circulation path are incorporated in the warm water circulation path of the warm water unit, and the strainer apparatus includes A controller that controls the electric heater for precipitation and the circulation pump, and the controller drives the circulation pump to circulate the circulating water in the hot water circulation path when the heat pump unit is at rest. In this state, the deposition electric heater is energized and at least the circulating water in the strainer device is heated to 60 ° C. or higher and dissolved in the circulating water. Calcium components are precipitating around the electric heater for the precipitation.

  Furthermore, the electric heater for auxiliary | assistant which heats the water in the said warm water circulation path is further provided, and the said control part is the said electric heater for precipitation and auxiliary | assistant in heating the circulating water in the said strainer apparatus to 60 degreeC or more at least. Energize both the electrical heaters to heat the circulating water in the hot water circulation path, and at least when the water temperature in the strainer device reaches a predetermined temperature of less than 60 ° C., energize the auxiliary electrical heater. After that, only the electric heater for deposition is energized.

  According to the present invention, in the strainer device having a mesh filter that captures foreign matters such as dust and impurities contained in the hot water in the hot water circulation path, at least the warm water (circulated water) in the strainer device is set to 60 ° C. or higher. Since it is equipped with a precipitation electric heater for heating and precipitating and removing the calcium component dissolved in water, the calcium component dissolved in water is removed by energizing the precipitation electric heater. It can be deposited and removed.

  Further, by braiding a heating wire made of nichrome wire or the like into the mesh filter, the mesh filter can also be used as an electric heater for deposition, thereby simplifying the configuration and reducing the size of the apparatus by reducing the number of parts.

  In addition, according to the configuration further including an electromagnet composed of an iron core and an electromagnetic coil as a magnetic substance adsorbing means, by energizing the electromagnetic coil, a magnetic body (metal piece, etc.) floating in water is appropriately magnetized with an electromagnet. Can be adsorbed, and damage to hot water parts (for example, sensors) due to metal pieces or the like is prevented.

  Further, according to the hot water heating device of the present invention, since the strainer device having the above-described electric heater for precipitation is incorporated in the hot water circulation path of the hot water unit, the scale to the water-refrigerant heat exchanger, piping, etc. Performance degradation due to adhesion of (calcium carbonate) can be prevented.

The block diagram which shows the structure of the hot water heating apparatus provided with the strainer apparatus which concerns on embodiment of this invention. Sectional drawing which showed the internal structure of the said strainer apparatus typically. The flowchart which shows an example of the scale removal process by the said strainer apparatus.

  Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 3, but the present invention is not limited to this.

    As shown in FIG. 1, the hot water heating apparatus 10 according to this embodiment includes a heat pump unit 20, a hot water unit 30 using the heat pump unit 20 as a heat source, and a heating unit 40 including a heating terminal on the use side. Yes.

  The heat pump unit 20 includes a compressor 21 that compresses refrigerant, a condenser 22, an expansion valve 23, and an evaporator 24, and has a refrigerant circuit in which these are connected by a refrigerant pipe 25.

  The heat pump unit 20 may be a reversible cycle system that is capable of switching between cooling and heating with a four-way valve. However, in the present invention, the heat pump unit 20 is used as a heat source for heating, and therefore is reversible. A valve is not particularly required. Therefore, what is necessary is just to provide the minimum function which can become a heat source which heats the circulating water of the hot water unit 30, and the specific structure of each component may be arbitrarily selected according to the specification.

  A heat exchanger 60 is provided between the heat pump unit 20 and the hot water unit 30 to exchange heat between the refrigerant flowing through the heat pump unit 20 and water as a heat medium flowing through the hot water unit 30.

  The heat exchanger 60 is a water-refrigerant heat exchanger, and in this embodiment, the condenser 22 is placed in a tank 61 for circulating water having a predetermined volume provided in a part of the hot water circulation path 31 of the hot water unit 30. Is stored, and the circulating water is heated by the condenser 22 in the tank 61 to generate hot water. Although not shown, the heat exchanger 60 may be a double pipe heat exchanger, for example.

  The hot water unit 30 includes a hot water circulation path 31 through which hot water (circulated water) generated by the heat exchanger 60 circulates. The warm water circulation path 31 is connected to the heat radiation circuit 41 on the heating unit 40 side via the warm water connection port 31a on the forward path side (warm water delivery side) and the warm water connection port 31b on the return path side (warm water return side).

  As described above, a part of the hot water circulation path 31 includes the heat dissipation circuit 41 on the heating unit 40 side. It is called the hot water circuit 31 including the heat radiation circuit 41.

  Outward-side piping 311 between the heat exchanger 60 and the hot water connection port 31 a in the hot water circulation path 31 is provided with an auxiliary heater device 32 that further heats the hot water heated by the heat exchanger 60.

  The auxiliary heater device 32 includes a cylindrical casing 32a having a hot water inlet 32b on the upper side and a hot water outlet 32c on the lower side. Although not shown, an auxiliary electric heater is accommodated in the cylindrical casing 32a. Yes.

  When the temperature of the hot water generated by the heat exchanger 60 does not reach a predetermined temperature, the auxiliary heater device 32 is energized to the auxiliary electric heater from a power supply (not shown) to bring the temperature of the circulating water to the predetermined temperature. Increase. The energization control to the auxiliary electric heater is performed by a control unit (CPU) 70 provided in the hot water unit 30.

  An air vent valve 33 is attached to the auxiliary heater device 32. The air vent valve 33 is attached to the upper end of the auxiliary heater device 32 in order to release the air accumulated in the auxiliary heater device 32 to the atmosphere.

  A strainer device 50, a pressure gauge 35, an expansion tank 36, a pressure safety valve 37, a water supply / drain valve 38, and a circulation pump 39 are respectively connected to the return side piping 312 between the hot water connection port 31 b and the heat exchanger 60 in the hot water circulation path 31. Is arranged.

  The pressure gauge 35 is used for measuring the pipe pressure in the hot water circulation path 31. The measurement data of the pressure gauge 35 is sent to the control unit 70.

  The expansion tank 36 is a tank that absorbs the thermal expansion of the circulating water. The pressure relief valve 37 is a relief valve that forcibly opens the hot water circulation path 31 to the outside air to prevent the pipe from bursting when the pipe pressure in the hot water circulation path 31 exceeds a specified value due to boiling of the circulating water or the like. It is.

  The water supply / drainage valve 38 is provided to inject water into the hot water circulation path 31 or to drain the circulating water in the hot water circulation path 31, and has a nipple and an open / close cock connected to a water pipe or the like at the tip thereof. (Both not shown) are provided.

  The circulation pump 39 is a pump for circulating the circulating water in the hot water circulation path 31 in one direction (clockwise in this embodiment), and its drive is controlled by the control unit 70.

  The heating unit 40 includes a heat radiation circuit 41 connected to the hot water circulation path 31 on the warm water unit 30 side via the warm water connection port 31a on the forward path side and the warm water connection port 31b on the return path side. The heat dissipating circuit 41 is provided with a heating terminal 42 as a heat source utilization side. The heating terminal 42 may be, for example, a floor heating device, a radiator, a fan convector, or the like.

  A feature of the present invention resides in the strainer device 50. As shown in FIG. 2, the strainer device 50 includes a cylindrical joint pipe 51 made of a cast product such as brass, and a filter unit 52 detachably attached to the joint pipe 51.

  In this embodiment, as shown in FIG. 1, the joint pipe 51 is interposed in, for example, a pipe portion between the hot water connection port 31 b and the pressure gauge 35 in the return side pipe 312, but other than this. You may interpose in a piping part. It may be a pipe portion on the outgoing path side pipe 311 side.

  The joint pipe 51 has connection ports 51a and 51b at both ends, and these connection ports 51a and 51b are connected to the upstream pipe end of the return pipe 312 via, for example, flare joints 313 and 313 and flare nuts 314 and 314. Part 312a and the downstream pipe end 312b, whereby the circulating water in the hot water circulation path 31 flows into the flow path 51c in the joint pipe 51 in the direction of the arrow (from right to left) shown in FIG. Flowing.

  In this embodiment, the filter unit 52 includes a mesh filter 55 formed in a cylindrical shape, and an electromagnet 56 that is preferably disposed coaxially in the mesh filter 55. The joint pipe 51 includes a filter mounting portion 53 for introducing the filter unit 52 into the flow path 51 c of the joint pipe 51.

  In this embodiment, the filter mounting portion 53 includes an inclined pipe portion 531 that is integrally drawn in an oblique direction along the direction of circulating water from the pipe wall of the joint pipe 51, and a joint on the downstream side of the inclined pipe portion 531. The pipe 51 is formed in a branched tubular shape having an inclined axis including a vertical pipe portion 532 that is drawn substantially vertically from the pipe wall.

  The filter unit 52 is connected to the inclined pipe portion 531 so that circulating water flowing from the upstream pipe end 312a (one connection port 51a) side flows into the mesh filter 55 from the upper end opening 551 of the mesh filter 55. Along the joint pipe 51.

  According to this embodiment, when the mesh filter 55 is disposed in the joint pipe 51, the corner of the upper end opening 551 contacts the pipe wall of the joint pipe 51 opposite to the filter mounting portion 53. A concave curved recess 511 is provided so that most of the circulating water passes through the mesh filter 55.

  A lid plate 54 is detachably attached to the opening of the filter mounting portion 53 by, for example, watertight screw fitting or the like, and the mesh filter 55 and the electromagnet 56 of the filter unit 52 are supported on the lid plate 54. Has been. That is, the filter unit 52 can be attached to and detached from the joint pipe 51 via the cover plate 54.

  The mesh filter 55 is composed of a fine-grained mesh body capable of capturing foreign matters such as dust and impurities contained in the circulating water. In this embodiment, the mesh filter 55 is dissolved in the circulating water. In order to be able to be used also as a deposition electric heater for depositing the calcium component, a part, preferably all, of the calcium component is formed by a heating wire.

  As the heating wire, a nichrome wire or the like having a heat generation capacity capable of heating the circulating water to 60 ° C. or higher is used. However, since it is immersed in the circulating water, it needs to be waterproofed. As described above, the entire mesh filter 55 is preferably formed in a net shape by heating wires, but heating wires may be knitted into a part of the mesh filter 55. The heating wire does not necessarily have to be knitted integrally with the mesh filter 55, and may be wired along the inner periphery or the outer periphery thereof.

  In addition, unlike this embodiment, this invention does not exclude the aspect further equipped with the electric heater for precipitation formed separately from the heating filter separately from the mesh filter 55. FIG.

  The electromagnet 56 may be a general electromagnet having a rod-shaped iron core 561 and an electromagnetic coil 562 wound around the iron core 561. However, since the electromagnet 56 is immersed in circulating water, the electromagnetic coil 562 includes As with the heating wire, it is necessary to perform waterproofing.

  The electromagnetic coil 562 generates heat when energized. Therefore, it can also be used as a deposition heater for depositing the electromagnetic coil 562 calcium. Such an embodiment is also included in the present invention.

  In this embodiment, the cover plate 54 is provided with a power supply connection portion 541 including heating wires of the mesh filter 55 and connection terminals (not shown) of the electromagnetic coil 562, and the power supply connection portion 541 has a power supply power supply side (not shown). A power supply connector 542 is connected. In this embodiment, the power supply connection portion 541 and the power feeding connector 542 are detachable by screw fitting.

  According to the strainer device 50, the mesh filter 55 that removes foreign matters by energizing the heating wire woven into the mesh filter 55 can be used as a calcium precipitation heater.

  Further, by energizing the electromagnetic coil 562 (direct current energization) to generate N and S magnetic poles in the electromagnet 56, a magnetic material such as a metal piece floating in the circulating water can be magnetically attracted to the electromagnet 56. it can.

  Next, an example of the calcium removal procedure by the strainer device will be described with reference to the flowchart of FIG. This calcium removal step is performed after the circulating water in the piping is replaced at the time of installation of the hot water heating apparatus 10 or at the time of maintenance, and before the main operation for use by the user, the calcium component contained in the circulating water. Is removed in advance.

  When the installation is described, assuming that the heat pump unit 20 and the hot water unit 30 are connected in advance, a heating unit 40 is connected to the hot water unit 30 by piping, and the hot water heating system includes the heat pump unit 20, the hot water unit 30 and the heating unit 40. All the power supplies of the apparatus 10 are turned off (step ST1), and the air vent valve 33 of the hot water unit 30 is opened to the atmosphere (step ST2).

  Next, a water supply pipe (not shown) is connected to the water supply / drainage valve 38, and water (for example, tap water) is poured into the hot water circulation path 31 (step ST3). At that time, after confirming the pressure gauge 35 and pouring water until the inside of the pipe reaches a specified pressure (step ST4), the water supply pipe is pulled out and the water supply / drainage valve 38 is closed (step ST5). Thus, the circulating water is poured into the hot water circulation path 31.

  After the water injection is completed, the hot water unit 30 is turned on and the calcium removal mode is selected (ST6). At this time, the power supply of the heat pump unit 20 is off and the heat pump unit 20 is stopped.

  Thereby, the control unit 70 drives the circulation pump 39 to circulate the water in the hot water circulation path 31 (step ST7), and the heating wire wired to the mesh filter 55 as the precipitation heater of the strainer device 50 and Energization of the auxiliary heater device 32 is started, and the circulating water in the hot water circulation path 31 is heated (step ST8).

  When the control unit 70 monitors the water temperature of the circulating water in the joint pipe 51 via a temperature sensor (not shown), and determines that the water temperature has reached a predetermined temperature (for example, 50 ° C.) that is lower than 60 ° C. ( Step ST9), the auxiliary heater device 32 is turned off, and energization of the heating wire of the mesh filter 55 as the deposition heater is continued (step ST10).

When the water temperature of the circulating water in the joint pipe 51 is 60 ° C. or higher, the calcium component (calcium hydrogen carbonate: Ca (HCO ₃ ) ₂ contained in the circulating water is added to the surface of the heating wire of the mesh filter 55 (CaCO ₃ ) It begins to precipitate as.

  Therefore, when the controller 70 determines that the temperature of the circulating water in the joint pipe 51 has reached 60 ° C. (step ST11), it starts a timer (not shown) until a predetermined set time (for example, 30 minutes) is reached. The energization to the heating wire of the mesh filter 55 is continued (step ST12). The setting of the energization time may be appropriately determined according to the amount of water and the quality of the circulating water.

  When the determination in step 12 is YES and a predetermined set time has elapsed, the control unit 70 turns off the energization of the circulating pump 39 and the mesh filter 55 to the heating wire (step ST13), and a series of calcium removal steps Finish.

  This calcium removal step is similarly performed before the start of the actual operation when the circulating water is replaced during maintenance or the like.

  In the above embodiment, both the auxiliary heater device 32 and the heating wire of the mesh filter 55 are energized so that the temperature of the circulating water is raised to a predetermined temperature lower than 60 ° C., which is lower than the precipitation temperature range. However, from the beginning, only the heating wire of the mesh filter 55 may be energized to heat the circulating water to 60 ° C. or higher. Such an embodiment is also included in the present invention. Further, the heat pump unit 20 may be operated to raise the temperature of the circulating water to a predetermined temperature of less than 60 °.

  Further, as described above, by energizing the electromagnetic coil 562 and generating the N and S magnetic poles in the electromagnet 56, the magnetic material such as a metal piece floating in the circulating water is magnetically attracted to the electromagnet 56. However, energization of the electromagnetic coil 562 may be performed during the calcium removal step, or may be performed before or after the calcium removal.

  Moreover, since the filter unit 52 can be attached to and detached from the pipe joint 51, the mesh filter 55 and the electromagnet 56 can be easily cleaned after installation or maintenance of the hot water heater.

DESCRIPTION OF SYMBOLS 10 Hot water heating apparatus 20 Heat pump unit 21 Compressor 22 Condenser 23 Expansion valve 24 Evaporator 30 Hot water unit 31 Hot water circulation path 32 Auxiliary heater device 33 Air vent valve 35 Pressure gauge 36 Expansion tank 37 Supply / drain valve 38 Pressure safety valve 39 Circulation pump DESCRIPTION OF SYMBOLS 40 Heating unit 41 Heat radiation circuit 42 Heating terminal 50 Strainer device 51 Joint pipe 52 Filter unit 53 Filter mounting part 54 Cover plate 55 Mesh filter 56 Electromagnet 561 Iron core 562 Electromagnetic coil 60 Heat exchanger 70 Control part

Claims (6)

In the strainer device having a mesh filter that captures foreign matters such as dust and impurities contained in the circulating water in the hot water circulation path,
A strainer device comprising a deposition electric heater for heating the circulating water to 60 ° C. or more to deposit and remove calcium components dissolved in the water.   The strainer device according to claim 1, wherein the deposition electric heater includes a heating wire wired to the mesh filter.   The magnetic material adsorption means for magnetically adsorbing the magnetic material contained in the circulating water further comprises an electromagnet composed of an iron core and an electromagnetic coil. A strainer device according to claim 1.   4. The strainer device according to claim 3, wherein the electromagnetic coil of the electromagnet also serves as a heating wire of the deposition electric heater. A hot water unit having a hot water circuit, a heat pump unit as a heat source for heating the circulating water in the hot water circuit to a predetermined temperature, and a heating unit having a heat dissipation circuit included in a part of the hot water circuit. In the hot water heater
The strainer device according to any one of claims 1 to 4 and a circulation pump for circulating the circulating water in the warm water circulation path are incorporated in the warm water circulation path of the warm water unit, The deposition electric heater provided in the strainer device and a controller for controlling the circulation pump,
When the heat pump unit is at rest, the control unit drives the circulation pump to circulate the circulating water in the hot water circulation path, and energizes the precipitation electric heater to at least the strainer device. A hot water heating apparatus characterized in that the circulating water inside is heated to 60 ° C. or higher, and the calcium component dissolved in the circulating water is deposited around the electric heater for precipitation.   The heater further includes an auxiliary electric heater for heating the water in the hot water circulation path, and the control unit at least heats the circulating water in the strainer device to 60 ° C. or higher. Energize both heaters to heat the circulating water in the hot water circulation path, and at least when the water temperature in the strainer device reaches a predetermined temperature of less than 60 ° C., the energization of the auxiliary electric heater is turned off. Thereafter, the hot water heater according to claim 6, wherein only the deposition electric heater is energized.

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