JP4124354B2 - Snow melting equipment - Google Patents

Description

  The present invention relates to a snow melting device that melts snow on a parking lot or a road in winter.

As such a conventional snow melting device, a hot water supply device using a gas burner as a heat source is built in, a circulating water pipe for circulating hot water heated by this hot water supply device through a pipe embedded in the snow melting target range, and a gas to the gas burner. The thing provided with the hot-water supply unit with which the gas pipe which supplies was piped was known. When a separately installed snowfall sensor detects the start of snowfall, the control device in the control panel built in the hot water supply unit determines that snowfall has started, and automatically circulates the hot water heated by the hot water supply device into the buried pipe. Warm the soil in the snow melting target area. And the warm water cooled by having warmed the road is again heated with the hot-water supply apparatus, and is sent out to a pipe (refer patent document 1).
Utility Model Registration No. 2577736 (FIG. 1)

  In the conventional snow melting device, since a burner is used as a heat source, it is necessary to exhaust the exhaust gas outside the hot water supply unit. Therefore, an exhaust port is provided on the outer wall surface of the hot water supply unit, and the combustion gas is exhausted from the exhaust port.

  The place where this type of snow melting device is installed has a large amount of snow and often has a very low outside temperature. Therefore, the combustion gas exhausted from the exhaust port is immediately cooled, and the water vapor in the combustion gas is condensed to become moisture. Furthermore, the water turns into ice in a short time. In particular, when the latent heat recovery heat exchanger is provided in the next stage of the heat exchanger, the exhaust gas temperature is low, so the time from exhaust from the exhaust port to condensation to produce water is shortened.

  If this water adheres to the outer wall surface of the hot water supply unit before it becomes ice, the water adhering to the outer wall surface of the hot water supply unit becomes ice, and the ice continues to grow. The combustion gas contains nitrogen oxides generated by combustion. In addition, when a gas burner is used as a heat source, sulfur gas is contained in the combustion gas because an odorous substance containing sulfur is added to the fuel gas.

  When these nitrogen oxides and sulfurous acid gas are dissolved in water, the aqueous solution shows strong acidity. When the water containing the strong acid freezes on the outer wall surface of the hot water supply unit, there is a problem that the outer wall surface of the hot water supply unit is corroded due to further concentration by moisture sublimation and evaporation.

  Then, this invention makes it a subject to provide the snow melting apparatus which the water | moisture content in exhaust gas does not freeze on the outer wall surface of a hot water supply unit in view of said problem.

In order to solve the above problems, a snow melting device according to the present invention includes a hot water supply device using a burner as a heat source, and a circulating water pipe for circulating hot water heated by the hot water supply device to a pipe embedded in the snow melting target range. In a snow melting apparatus having a piped hot water supply unit, the latent heat recovery heat for transferring latent heat from water vapor in the combustion gas to the circulating water in the next stage of the heat exchanger that transfers sensible heat from the combustion gas of the burner to the circulating water. An exhaust port that exhausts exhaust gas that has passed through the latent heat recovery heat exchanger is configured with an exhaust port base portion that is attached to the combustion cylinder and a duct member that is detachably attached to the exhaust port base portion. The base portion includes a cylindrical portion that opens toward the front and a circumferentially continuous flange that is provided at the rear end of the cylindrical portion, and is attached to the combustion cylinder with the flange. It has a cylindrical duct part that is longer than the cylindrical part of the base part. The duct part is attached to the cylindrical part of the exhaust outlet base part, and exhaust gas discharged from the cylindrical part of the exhaust outlet base part is further guided forward by the duct part of the duct member. The tip of the duct part of the duct member protrudes from the outer peripheral wall of the hot water supply unit so that the moisture in the exhaust gas discharged from the duct part does not freeze on the outer peripheral wall of the hot water supply unit And

  In particular, when a latent heat recovery heat exchanger is provided, the temperature when exhausting the combustion gas is low. For this reason, water vapor is immediately condensed into water near the tip of the exhaust port, and tends to adhere to the periphery of the exhaust port. Therefore, when the hot water supply apparatus includes the latent heat recovery heat exchanger as described above, it is necessary to pay particular attention to the position of the tip of the exhaust port.

The duct member is heated by the combustion gas, and ice hardly accumulates, but may cause corrosion. Therefore, if detachably against the duct member forming the exhaust port for hot water supply unit, can be corroded easily replaced.

  In addition, the fuel of the burner may be a gas liquid, but when gas is used as the fuel, the odorous substance is added as described above, so there is a high possibility that sulfurous acid or sulfuric acid is dissolved in the condensed water. When ice is deposited, corrosion of the deposited portion is likely to proceed. Therefore, the above invention is particularly effective when the burner is a gas burner.

  As is apparent from the above description, the present invention is designed to prevent moisture contained in the exhaust from icing on the outer wall surface of the hot water supply unit even in the case where the heat source is a burner in a snow melting device used in an extremely cold environment. Therefore, the outer wall surface around the exhaust port can be prevented from corroding.

  Referring to FIG. 1, reference numeral 1 denotes a snow melting device according to the present invention. The snow melting device 1 has a main unit 2 that is a hot water supply unit and a subunit 3 that is also a hot water supply unit. In this embodiment, two subunits 3 are connected to one main unit 2 in a row in the horizontal direction. However, the number of subunits 3 is increased or decreased as appropriate according to the size of the snow melting target range.

  The main unit 2 and the two subunits 3 are installed on a foundation B provided in contact with the wall surface W. The foundation B is formed in the vicinity of the snow melting target range, and a relatively flexible resin pipe 11 is embedded in the snow melting target range. This pipe 11 is connected to an outgoing water pipe 41 and a condensate pipe 42 which are circulating water pipes.

  Circulating water is filled in the pipe 11, and hot water discharged from the main unit 2 through the water supply pipe 41 circulates in the pipe 11 and is returned from the condensate pipe 42 to the main unit 2. Then, the circulating water that has returned through the condensate pipe 42 is heated by the main unit 2 and the subunit 3 and is circulated from the water pipe 41 to the pipe 11 again.

  A temperature sensor 14 is embedded in the vicinity of the pipe 11, and is configured to measure the temperature of the soil heated by the warm circulating water in the pipe 11 and to input a detection signal to the control device in the main unit 2. ing. By the way, 12 is a remote control installed in the room, and the operation of the snow melting device 1 can be controlled indoors. Further, a snowfall sensor 13 is provided. When the snowfall sensor 13 detects the start of snowfall, the hot water is automatically circulated through the pipe 11. Note that the heat source of the main unit 2 and the subunit 3 is a gas burner, and the drain generated by the combustion of the gas is collected in the main unit 2 and discharged through the drain pipe 20 to the seepage trough 20a.

  Referring to FIG. 2, hot water supply devices 21 and 31 are incorporated in main unit 2 and sub unit 3, respectively. Then, in the drawing of the main unit 2, the forward water pipe 41, the condensate pipe 42, and the gas pipe 5 are connected to the main unit 2 through the opening 22 directed to the left side and the openings 32 and 33 provided on both side surfaces of the subunit 3. To the left end subunit 3 in the figure, the units were connected at the joints. In addition, with reference to FIG. 3, the annular packing P surrounding the opening 32 was pasted in advance on the right side surface in the drawing of the subunit 3. In addition, a closing plate 30 that closes the opening 22 is attached to the left side of the main unit 2 before connection, and when the other subunits 3 are connected, the closing plate 30 is removed and the direction of the connected subunits. It was attached to the left side, and the opening 33 on the left side was newly closed.

  By the way, the rear surface of the subunit 3 is provided with an intake port for taking in combustion air, but the combustion air sucked from the intake port 24 provided in the right side surface 23 in the figure of the main unit 2 is the main air. In addition to being supplied to the hot water supply device 21 of the unit 2, it is supplied to the hot water supply devices 31 of all the subunits 3 through the openings 22, 32 and 33. 2P is a circulation pump for circulating hot water.

  Referring to FIG. 3, the packing P is attached to the right side surface 34 of the subunit 3 as described above. The packing P is formed of a foamable resin such as urethane foam, and is formed so as to have a thickness of 10 mm in an uncompressed body. And the protrusion 35 which is a distance control means which protruded 6 mm from the right side surface 34 was formed in the upper and lower sides of this packing P. As shown in FIG.

  A hole 35a through which the connecting bolt 16 is inserted is formed in the center portion of the projecting seat. When the other subunit 3 is connected to the main unit 2 or the subunit 3 with the connecting bolt 16, the packing P has a thickness of 6 mm. Until it becomes, and no further compression.

  In this embodiment, an 8 mm screw (M8) is used as the connecting bolt 16, and a hole 35 a having a diameter of 9 mm is formed in the projecting seat 35. Further, a hole 25a having a diameter of 9 mm through which the connecting bolt 16 is inserted is also provided on the left side surface 25 of the main unit. Therefore, the main unit 2 and the subunit 3 that are connected to each other by the connecting bolt 16 are positioned with a positional accuracy within 0.5 mm in the front-rear and vertical directions. In this embodiment, the connecting bolt 16, the hole 35 a of the protrusion 35 and the hole 25 a of the left side surface 25 constitute a positioning means. The left side surface 36 of the subunit 3 is similarly provided with a hole 36a, and the same positioning can be performed when the two subunits 3 are connected.

  When the main unit 2 and the subunit 3 are connected to each other by the connecting bolts 16 in this way, the adjuster bolts 15 attached to the bottoms of both the units 2 and 3 are adjusted so that each adjuster bolt 15 is applied to the foundation B. Make contact. And although not shown in figure, an anchor bolt is embed | buried in the foundation B and the adjuster bolt 15 is fixed to the foundation B with a pressing metal fitting.

  When the units 2 and 3 are thus connected to each other, the outgoing pipe 41, the condensate pipe 42, and the gas pipe 5 are connected next. Since the pipes are connected in the same manner, the connection operation will be described with reference to FIG. 3 taking the connection of the gas pipe 5 as an example. A connecting fitting 51 is brazed to the upstream end of the gas pipe 5 built in the sub unit 3 in advance, and another connecting fitting is attached to the downstream end and the downstream end of the gas pipe 5 of the main unit 2. 54 is brazed.

  Two O-rings 53 are attached to the upstream connection fitting 51, and a sleeve 52 that slides while covering the two O-rings is further attached. Similarly, two O-rings 56 are attached to the downstream connection fitting 54, and the sleeve 52 is slid so that the O-ring 56 of the opposite downstream connection fitting 54 is connected with the sleeve 52 as shown in the figure. If covered, the gas pipe 5 is connected. However, since the connection is released when the sleeve 52 retreats as it is, the screw 52a attached to the distal end portion of the sleeve 52 is inserted into the groove 55 formed in the downstream connection fitting 54 so that the sleeve 52 I tried not to retreat. Reference numeral 50 denotes a metal end cap.

  The hot water supply devices 21 and 31 have the same structure. The hot water supply device 21 will be described as an example. As shown in FIG. 4, the hot water supply device 21 is provided with a burner portion 6 having a gas burner therein. The burner unit 6 is provided with a blower fan 61 for forcibly sending combustion air into the burner unit 6. A branch pipe 5 a from the gas pipe 5 is connected to the burner portion 6. Therefore, the gas supplied from the branch pipe 5a and the combustion air supplied from the blower fan are mixed in the burner section 6 and are jetted downward from the flame hole of the burner.

  A heat exchanger 62 is provided below the burner unit 6. In this heat exchanger 62, heat is transferred from the high-temperature combustion gas in the heat exchanger 62 to the cold water supplied through the branch pipe 41a from the outgoing water pipe 41, and is connected to the condensate pipe 42 in the heated state. This is sent out to the branch pipe 42a.

  A latent heat recovery heat exchanger 63 is connected to the lower part of the heat exchanger 62. In the heat exchanger 62, the sensible heat of the combustion gas is transmitted to the circulating water. The temperature of the combustion gas that has passed through the heat exchanger 62 is 100 ° C. or higher. Therefore, when the combustion gas passes through the latent heat recovery heat exchanger 63, the cold water in the branch pipe 41a is preheated. At this time, the temperature of the combustion gas is lowered to the dew point (about 60 ° C.), and the water vapor contained in the combustion gas is condensed and returned to the water so that the latent heat of the water vapor is transferred to the cold water from the branch pipe 41a. did.

  The condensed water is received by the drain receiver 64, and is discharged to the permeation tank 20a through the drain pipe 20 as described above. Further, the combustion gas whose temperature has decreased to about 60 ° C. is discharged to the outside of the main unit 2 through the duct 8 forming the exhaust port.

  Reference numeral 60 denotes a combustion cylinder. As shown in FIGS. 5 and 6, in a state where the duct 8 is overlapped with the exhaust port base 7 fixed to the combustion cylinder 60, the duct 8 and the exhaust port base 7 are combined with the combustion cylinder 60. Screwed to. Therefore, the duct 8 can be freely attached and detached by removing the screws that fix the exhaust port base 7 and the duct 8 to the combustion cylinder 60, and therefore the duct 8 can be replaced as necessary.

  The exhaust port base 7 is formed with a cylindrical portion 71 that opens forward, and the tip is folded back, but a drain port 72 is provided so that drain is discharged. The duct 8 is similarly provided with a cylinder portion 81, and is screwed to the combustion cylinder 60 in a state where the cylinder portion 81 is covered with the cylinder portion 71. In addition, the bridge part 82 which bisects the front-end | tip opening of the cylinder part 81 up and down was provided. The bridge portion 82 is for preventing a small bird from entering the duct 8.

  As shown in FIG. 6, after the exhaust port base 7 and the duct 8 are attached to the combustion cylinder 60, one annular seal 2 </ b> P is attached, and the front lid 21 </ b> F of the hot water supply device 21 is attached. Further, after the seal 2P is attached, the front plate 2F of the main unit 2 is attached.

  With the front plate 2F attached, the front end of the cylindrical portion 81 of the duct 8 was set so as to protrude from the front plate 2F by a predetermined distance T. A low-temperature combustion gas is exhausted from the cylindrical portion 81. When the combustion gas S comes into contact with the extremely low temperature outside air, the water vapor component contained immediately condenses into water droplets and further becomes ice.

  When the protruding amount T of the cylindrical portion 81 of the duct 8 is 10 mm or more, even if the moisture in the combustion gas S is condensed and becomes water, it further becomes ice before reaching the front plate 2F, and becomes the front plate 2F. The ice does not stick. Since the cylinder part 81 itself is heated by the combustion gas S, the drain generated in the cylinder part 81 does not freeze in the cylinder part 81 and falls as water droplets D.

  In addition, this invention is not limited to an above-described form, You may add a various change in the range which does not deviate from the summary of this invention. For example, although the gas burner is used as the heat source of the hot water supply devices 21 and 31, an oil burner that burns liquid fuel such as kerosene may be used as the heat source.

The figure which shows the structure of one embodiment of this invention The figure which shows the connection state of each unit Diagram showing the state of piping between units Diagram showing the internal structure of a hot water supply device Perspective view showing the shape of the duct Diagram showing the relationship between the duct and the front plate

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Snow melting apparatus 2 Main unit 2F Front plate 3 Sub unit 5 Gas pipe 6 Burner part 7 Exhaust port base part 8 Duct 21 Hot water supply apparatus 21F Front cover 41 Outflow pipe 42 Condensate pipe 60 Combustion drum 61 Blower fan 62 Heat exchanger 63 Latent heat recovery heat Exchanger

Claims (2)

In the snow melting device having a hot water supply unit having a hot water supply unit having a burner as a heat source and having a circulating water pipe for circulating hot water heated by the hot water supply device in a pipe embedded in the snow melting target range, the burner is provided. Next to the heat exchanger that transfers sensible heat from the combustion gas to the circulating water, a latent heat recovery heat exchanger that transfers the latent heat from the water vapor in the combustion gas to the circulating water is provided. An exhaust port for exhausting exhaust gas is composed of an exhaust port base portion that is attached to the combustion cylinder and a duct member that is detachably attached to the exhaust port base portion. A circumferentially continuous flange provided at the rear end of the exhaust pipe, and the flange member is attached to the combustion cylinder with the flange. The duct member includes a tubular duct portion longer than the tubular portion of the exhaust base, and the duct member Is attached to the tube portion of the exhaust port base, and the exhaust gas discharged from the tube portion of the exhaust port base is guided further forward by the duct portion of the duct member, and the moisture in the exhaust gas discharged from the duct portion is A snow melting device characterized in that the position of the end of the duct portion of the duct member protrudes from the outer peripheral wall of the hot water supply unit so that the outer peripheral wall does not freeze . The snow melting device according to claim 1 , wherein the burner is a gas burner.

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