JP2012083004A - Mechanism for releasing air in piping of solar water heating system, and method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely release air in piping in a short time by improving a heating medium pressure feeding force during working on heating medium packing and on releasing air in piping, relating to a solar water heating system of a heating-medium forcedly-circulated type.SOLUTION: The mechanism for releasing air in piping which accompanies the packing of the heating medium in the piping of a solar water heating system includes a first pump which supplies the heating medium to the piping of a circulation path by discharging the heating medium from a heating reservoir tank at a constant quantity along only one direction, a second pump of a turbo type which is interposed in the piping of the circulation path, first and second opening/closing valves that are interposed in outward and homeward paths of the circulation path, respectively, for opening and closing the path, a direction switching valve provided at a piping connection part of the first bump, the heating medium reservoir tank, and a homeward path. An electromagnetic pump is connected by piping to a first branch connection part in a circulation path piping on the upper stream side in an outward path upward direction of the second pump. A direction switching valve is connected by piping to a second branch connection part on the lower stream side in homeward path upward direction of the second/closing valve on the homeward path side in homeward path.

Description

  In the present invention, antifreezing liquid is filled in a circulation path pipe that circulates between a heat collecting panel installed on a building roof surface or the like and a heat exchange tank arranged on the ground or the like, and the supplied water is converted into warm water by the exchange heat. The present invention relates to an in-pipe air venting mechanism and an in-pipe air venting method of a solar hot water system to be taken out.

Global warming, mainly caused by greenhouse gases, is predicted to “prevent development everywhere on the planet” (AR4: IPCC Fourth Assessment Report). This is an increase in CO ₂ due to the use of fossil fuels. Now that the cause is almost clear, the development and use of fossil alternative energy can be said to be an urgent issue. The applicant proposed a sealed or forced circulation solar water heating system (solar system) using antifreeze or the like as a heat medium in a circulation (heat collection) circuit piping between the heat collector and the heat storage tank according to Patent Document 1. In particular, the method of filling the heat medium into the circulation circuit during use was shown.

Japanese Patent No. 3234976

  FIG. 4 is a simplified configuration explanatory diagram of the solar hot water system of Patent Document 1. In the solar hot water system of Patent Document 1, a heat collecting panel 1 installed on the roof of a building and a heat storage tank 2 installed on the ground side are provided. Pipes are connected so as to form the circulation path 3, and the circulation path 3 is filled with a heat medium, and is circulated and driven by a circulation drive mechanism 4 interposed in the circulation path. In the figure, 10 is a heat medium storage tank, 12 is an electromagnetic pump, 14 is a circulation pump, 16 is a heat exchanger disposed in the heat storage tank 2, and 18 is a pipe between the heat medium storage tank 10, the electromagnetic pump 12, and the circulation path. A connection direction switching valve, 20 is an on-off valve provided on the forward side of the circulation path, 22 is an on-off valve provided on the return side of the circulation path, and 24 is a reserve tank for managing the supply level of the heat medium. Water is supplied to the heat storage tank 2 through a water supply port 26, while the hot water outlet 28 is connected to heating, bath water, kitchen hot water supply equipment, etc. via a distributor (not shown).

  In the solar hot water system of Patent Document 1, when charging the heating medium into the piping of the circulation path 3, first, the electromagnetic pump 12 is started and (1) in the direction of the arrow (clockwise in the figure), that is, the return path. The heat medium is filled up to the reserve tank 24 from the 3B side. At this time, the return path on-off valve 22 is in the open state ((1) -O), the forward path on-off valve 20 is in the closed state ((1) -S), and the direction switching valve 18 is only connected to the heat medium storage tank 10 and the electromagnetic pump 12. It is set to communicate. (2) Next, in the circulation path 3, (2) the heat medium is filled up to the reserve tank 24 in the direction of the arrow (counterclockwise in the figure), that is, from the forward path 3A side. At this time, the forward opening / closing valve 20 is in an open state ((2) -O), the backward opening / closing valve 22 is in a closed state ((2) -S), and the direction switching valve 18 is a heating medium as in the case of the clockwise charging. Only the storage tank 10 and the electromagnetic pump 12 are set to communicate with each other. (3) Finally, in the circulation path 3 (3) in the direction of the thick arrow (counterclockwise in the figure), that is, from the forward path side, the heat medium passes through the reserve tank 24, flows through the return path, returns to the circulation pump 14, and is further discharged. The heating medium is circulated in a closed circuit. At this time, both the forward opening / closing valve 20 and the return opening / closing valve 22 are in the open state ((3) -O), and the direction switching valve 18 is blocked from being introduced from the heat medium storage tank 10 to the electromagnetic pump 12, and is electromagnetically connected to the return path 3B. It is set to communicate only with the pump 12.

  In the solar hot water system of Patent Document 1 described above, the pump in the circulation drive mechanism is reduced in size, consumes less power, and has the effect of preventing air from being enclosed in the circulation path. In the closed circuit circuit drive of the heat medium in FIG. 5, in the piping junction k between the discharge side of the electromagnetic pump 12 and the forward path 3A, the heat medium is simultaneously supplied from both the circulation pump 14 side and the electromagnetic pump 12 side as shown in FIG. Since it merges into the pipe junction k, the pressure loss at this k portion increases, and as a result, the pumping flow rate of the heat medium per unit time decreases, resulting in a longer time for air venting at the time of filling the heat medium, impairing work efficiency. There was a problem. In addition, since the entire length of the pipe becomes longer and the heat medium pumping force becomes smaller, the air bleeding accuracy in the pipe is also affected, and the pump operating efficiency may be lowered.

The present invention has been made in view of the above-described conventional problems, and its purpose is to improve the heat medium pressure feeding force during the heat medium filling and the air venting work in the pipe in the heat medium forced circulation solar hot water system, and reliably To provide an air bleed mechanism in a solar hot water system and a method for air bleed in the pipe that can reduce air evacuation in the pipe and evacuate the pipe in a short time and shorten the system start-up time. is there.

  In order to solve the above-described problems, the present invention provides a heat collecting panel 1, a heat exchanging unit 16 that exchanges heat between the heat medium heated by the heat collecting panel and water, and the heat collecting panel 1 and the heat exchanging unit 16. An air vent mechanism 5 in a pipe in a solar hot water system in which a circulation drive mechanism 4 for circulatingly driving the heat medium is connected to form a circulation path 3 for the heat medium. The air vent mechanism 5 in the pipe circulates. A first pump 50 which is also used as the drive mechanism 4 and discharges the heat medium from the heat medium storage tank 10 only in one direction to supply the heat medium to the piping of the circulation path 3; The turbo-type second pump 60 provided in the vicinity of the pump 50 and installed in the piping of the circulation path 3, and the forward path 3A and the return path 3B based on the heat medium storage tank 10 in the circulation path 3, respectively. First and second on-off valves 20 and 2 that open and close the path. And the direction switching valve 18 provided in the pipe connection part 100 of the first pump 50, the heat medium storage tank 10, and the return path 3B, and the circulation path upstream of the forward direction Q of the second pump 60. A first branch connection portion 40 in which a first pump 50 is connected to three pipes, and a direction switching valve 18 on the downstream side with respect to the return upstream R direction of the return valve 2 on the return path 3B. And a second branch connection part 42 connected to the pipe, and the air vent mechanism 5 in the pipe in the solar hot water system.

  The present invention also relates to the heat collection panel 1, the heat exchange unit 16 that performs heat exchange between the heat medium heated by the heat collection panel 1 and water, and the heat medium between the heat collection panel 1 and the heat exchange unit 16. And a circulation drive mechanism 4 that circulates and circulates the air in the pipe in the solar hot water system in which the circulation path 3 of the heat medium is formed by pipe connection, and the circulation of the heat medium from the heat medium storage tank 10 in the circulation drive mechanism 4. A first pump 50 for supplying a heat medium to the piping of the circulation path 3 by quantitatively discharging the gas only in one direction, and a heat exchange unit 16 provided in the vicinity of the first pump and interposed in the piping of the circulation path 3. A turbo-driven second pump 60 arranged in the vicinity and a plurality of valves 18, 20, 22 provided in the circulation path are prepared, and the heat medium from the heat medium storage tank 10 is transferred by the first pump 50. On the return path based on the heat medium storage tank 10 in the circulation path 3 A first step in which the heat collecting panel 1 is filled with a heat medium by pumping in the direction R or the forward direction Q, and a heat medium from the heat medium storage tank 10 is second after the first step. From the upstream side of the pump 60, the forward path upward direction Q or the backward path upward direction R with respect to the heat medium storage tank 10 in the circulation path 3, and in the direction opposite to the first step. A second step of pumping the heat collecting panel 1 with a heat medium pumped by the first pump 50, and a first step toward the upstream direction Q of the circulation path 3 by cutting off the supply of the heat medium from the heat medium storage tank 10. A first pump 50 and a second pump 60 connected in series so as to position the pump 50 upstream are connected to the circulation path 3, and the first and second pumps 50, The heat medium is pumped by 60 and flows through the circulation path 3 so that the air in the pipe A third step of performing a tree, and a pipe air-release method in solar water system including.

  According to the air venting mechanism in the solar hot water system of the present invention, the heat collecting panel, the heat exchanging part for exchanging heat between the heat medium heated by the heat collecting panel and water, the heat collecting panel and the heat exchanging A circulation drive mechanism that circulates and drives the heat medium between the parts, and a piping air vent mechanism in a solar hot water system in which a circulation path of the heat medium is formed by pipe connection, and the air vent mechanism in the pipe is connected to the circulation drive mechanism A first pump that is provided in common and that discharges the heat medium from the heat medium storage tank only in one direction and supplies the heat medium to the piping of the circulation path; and in the vicinity of the first pump. A turbo-type second pump interposed in the circulation path piping, and a first and second opening / closing opening and closing path that are interposed in each of the forward path and the return path based on the heat medium storage tank in the circulation path A valve, a first pump and a heat medium storage tank; A direction switching valve provided in a pipe connection portion with the road, a first branch connection portion in which the first pump is pipe-connected to the circulation path pipe upstream of the second pump in the upstream direction, and a return path And a second branch connection portion in which a direction switching valve is piped downstream with respect to the upstream direction of the second open / close valve on the return path side. By switching, the heat medium is supplied from the first pump to the heat collecting panel side by serial piping, and at the same time the first and second pumps are connected in series at the time of air venting circulation operation in which the heat medium supply from the heat medium storage tank is shut off. Since the path from the side to the direction switching valve can be shortened, the heat medium forced circulation type solar hot water system improves the heat medium pumping force at the time of heat medium filling and pipe air venting work, In a short time Realized the tube air vent, it is possible to significantly reduce the system start-up time.

  Moreover, according to the air venting method in the solar hot water system of the present invention, the heat collecting panel, the heat exchanging part for exchanging heat between the heat medium heated by the heat collecting panel and water, the heat collecting panel, A circulation drive mechanism that circulates and drives a heat medium between heat exchange units, and a method for venting air in a pipe in a solar hot water system in which a circulation path of the heat medium is formed by pipe connection, from the heat medium storage tank in the circulation drive mechanism A first pump for quantitatively discharging the heat medium in only one direction and supplying the heat medium to the piping of the circulation path, and in the vicinity of the first pump and in the vicinity of the heat exchanging section provided in the circulation path of the pipe A second pump with a turbo drive arranged in the tank and a plurality of valves interposed in the circulation path are prepared, and the heat medium storage tank in the circulation path is transferred to the heat medium from the heat medium storage tank by the first pump. Backward as a reference or forward A first step of pumping the heat collecting panel into the heat collecting panel and filling the heat collecting panel with the heat medium, and circulating the heat medium from the heat medium storage tank after the first step from the upstream side of the second pump The heat pump is pumped by the first pump in either the forward or backward direction relative to the heat medium storage tank in the first direction and in the opposite direction to the first step. A second step of filling, and a first pump and a second pump connected in series so as to block the supply of the heat medium from the heat medium storage tank and position the first pump upstream in the forward direction of the circulation path A third step in which the pump is connected to the circulation path, the heat medium is pumped by the first and second pumps in the upstream direction of the circulation path, and the circulation path is circulated to vent the air in the piping; Because it is a configuration that includes a heat medium forced circulation solar water heating system Improve heat pumping power during heating medium filling and piping air venting work, realize reliable air venting and air venting in the pipe in a short time, and greatly shorten the system startup time Can do.

It is an effect | action and structure explanatory drawing of the in-pipe air bleeding mechanism in the solar hot water system which concerns on embodiment of this invention. It is another effect | action and structure explanatory drawing of the in-pipe air vent mechanism in the solar hot water system of FIG. It is another effect | action and structure explanatory drawing of the in-pipe air vent mechanism in the solar hot water system of FIG. It is an effect | action and structure explanatory drawing of the in-pipe air bleeding mechanism in the conventional solar hot water system. It is a partially expanded explanatory view of the piping path | route of FIG.

  Next, an in-pipe air vent mechanism in the solar hot water system according to the embodiment of the present invention will be described with reference to FIGS. The in-pipe air venting mechanism in the solar hot water system of the present invention is an in-pipe air venting mechanism that is performed in association with the heating medium filling operation in the solar-heated hot water system of the heat medium forced circulation type. In addition, the same code | symbol is attached | subjected and demonstrated to the same member as the conventional solar water heating system structure of FIG.

  1, 2, and 3, the in-pipe air vent mechanism 5 in the solar hot water system of the embodiment includes a heat exchanging unit 1 and a heat exchanging unit that exchanges heat between the heat medium heated by the heat collecting panel and water. (16) and a circulation drive mechanism 4 that circulates and drives the heat medium between the heat collecting panel and the heat exchanging section, and the air vent mechanism 5 in the pipe in the solar hot water system in which the circulation path 3 of the heat medium is formed. It is. The in-pipe air venting mechanism 5 is provided so as to share a part with the circulation driving mechanism 4.

  In FIG. 1, two heat collecting panels 1a and 1b each incorporating a known heat collecting tube are installed on the roof surface (not shown) at the top of the building in communication with each other. A heat medium such as antifreeze filled in the heat pipe is heated and circulated to the heat storage tank 2 side through the circulation path 3. The heat storage tank 2 is installed on the ground side, and a lower water supply port 26 and an upper hot water outlet 28 are attached to the heat storage tank 2, connected to a liquid supply pipe (not shown), and further required via a heat source distributor. Supplied to demand sources such as heating, kitchen hot water and bath water. One of the heat collecting panels 1 is provided with a heat medium reserve tank 24 connected in communication. The reserve tank 24 is provided with an air escape hole communicating with the atmosphere (not shown) and a plurality of sensors for detecting different liquid level heights in the tank.

  The heat collection panel 1 and the heat storage tank 2 are communicated by a pipe made of polyethylene or the like to constitute a circulation path 3 as a closed circuit. In the embodiment, the counterclockwise path from the heat storage tank 2 to the heat collecting panel 1 side indicated by the arrow (2) in FIG. A clockwise path from the first pump 50 to the heat collecting panel 1 side as indicated by an arrow (1) in FIG. 1 with the storage tank 10 as a reference or starting point is defined as a circulation return path 3B.

  In FIG. 1, a heat medium circulation drive mechanism 4 is provided in a circulation path 3 between the heat collection panel 1 and the heat storage tank 2, and the circulation drive mechanism 4 is heated by receiving heat from the heat collection panel 1. The heated heat medium is exchanged in the heat storage tank, and the cooled heat medium is sent to the heat collecting panel 1 and heated again in the circulation path 3 to circulate and drive the heat medium.

  In the heat storage tank 2, a part of the piping pipe is bent, inverted, or circulated in multiple layers to form the heat exchanger 16, and water introduced into the heat storage tank 2 from the lower water supply port 26 is heated by the heat exchanger 16. The water is exchanged and warmed, and is led out from the upper hot water outlet 28 to be used.

  As the heating medium filled in the piping of the circulation path 3, for example, a so-called antifreeze liquid composed of an aqueous solution of a harmless component having a low freezing point such as propylene glycol is used. The heat medium is not limited to this, and for example, an antifreeze solution composed of an aqueous solution in which harmless salts or the like are mixed to lower the freezing point may be used.

  1 to 3, the circulation drive mechanism 4 interposed in the circulation path includes a heat medium storage tank 10, a first pump 50, a second pump 60, and a plurality of valve members 18 to 22. I have. Similarly, the in-pipe air vent mechanism 5 includes the heat medium storage tank 10, the first pump 50, the second pump 60, and a plurality of valve members 18 to 22. The plurality of valve members include a direction switching valve 18, an outward opening / closing valve 20 as a first opening / closing valve, and a return opening / closing valve 22 as a second opening / closing valve.

  In the figure, a heat medium storage tank 10 always stores a predetermined amount of heat medium, and switches and supplies the heat medium to the first pump 50 and the circulation return path 3B connected in communication via the direction switching valve 18. To do.

  The first pump 50 is a first pump means that discharges the heat medium from the heat medium storage tank 10 only in one direction and supplies the heat medium to the piping of the circulation path, and discharges the heat medium only in one direction. A positive displacement pump that has a check valve function and is small in size and holds a relatively high head by quantitatively discharging a heat medium in a fixed volume space is applied. Specifically, for example, an electromagnetic pump or the like can be used. Some positive displacement pumps change the volume by a reciprocating motion or a rotational motion to drive the liquid under pressure. The first pump 50 always pumps the heat medium received via the direction switching valve 18 only to the circulation return path 3B side of the second pump 60. Specifically, the electromagnetic pump as the first pump is provided with, for example, an orifice in a water conduit having an inlet and an outlet, and a drive unit casing is connected in a crossing direction to an intermediate portion of the water conduit. A spring-biased forward / backward moving body mechanism is provided, and an electromagnetic solenoid is provided in this casing, and a valve mechanism is provided to allow liquid to flow only in the direction from the inlet to the outlet and to block the flow in the reverse direction. A known electromagnetic pump is used that discharges a liquid such as an antifreeze liquid in a water conduit at a high discharge pressure in a predetermined discharge direction through an orifice by moving an advance / retreat moving body in an advance / retreat direction at high speed by electromagnetic force. The electromagnetic pump according to the embodiment has a simple configuration as described above, and has a large discharge force and is small and low in cost. However, it has a large pumping power (liquid) for liquid pumping and the like, and even a small pump is about 50 m. Liquid pumping can be easily performed even with respect to the head.

  The second pump 60 is a circulation pump that circulates and drives the heat medium, and is interposed in the piping of the circulation path 3. In the embodiment, the second pump 60 is a turbo pump that applies propulsive force to the liquid by rotation of the impeller and allows the liquid to flow in the connecting direction on both sides. Specifically, the second pump 60 is configured by, for example, an axial flow or a diagonal flow pump. Yes. As shown in the figure, the second pump 60 is interposed in a route pipe at an intermediate position between the heat storage tank 2 and the first pump 50, and the forward route of the circulation forward route 3 </ b> A with the first pump 50 as a reference. It is installed upstream of the heat storage tank 2 with respect to the upward direction. The second pump has a large liquid discharge amount and can drive the liquid in a continuous flow. However, the suction / push-up lift is relatively low, and the flow rate varies greatly depending on the load.

  Therefore, in the case of a pipe in which a heat storage tank is installed on the north surface side of the house and a circulation path is formed by a closed circuit and a closed circuit as in this embodiment, there is a certain amount of head, Therefore, there is a need for a drive mechanism that maintains a sufficient discharge amount and discharge pressure of the heat transfer fluid corresponding to the head due to a pressure loss of the piping, and further has a one-way discharge force in the discharge drive body. In the present embodiment, the first pump 50 composed of an electromagnetic pump having a check function performs a reliable discharge function, and the second pump 60 holds the discharge amount and reliably drives the heat transfer fluid to circulate. .

  Then, the heat storage tank 2 and the second pump 60 are arranged in series in a part of the circulation path 3 forming the closed circuit, and the other end piping side of the second pump 60 is connected in series piping. The valve 18 and the path 30a of the first pump 50 and the path 30b provided with the return path opening / closing valve 22 are connected in communication with each other by a parallel connection portion connected in parallel. The other joint part of the parallel connection of the path | route 30a and the path | route 30b is pipe-connected to the circulation return path 3B.

  In the present invention, what is characteristic is that the first pump 50 and the second pump 60 are connected to each other at the first branch connection portion 40 in the upstream path of the second pump 60 in the forward path 3A, and the heat medium. The direction switching valve 18 connected to the storage tank 10 and the first pump 50 is connected at the second branch connection portion 42 on the downstream side with respect to the upward direction of the return path with respect to the return path on-off valve 22 connected in parallel therewith. It is. Thus, the first heat medium filling mode from the heat medium storage tank 10 to the heat collecting panel 1 from the direction switching valve 18, the first pump 50, the first branch connection portion 40, and the return path opening / closing valve 22, and the heat medium storage A second heat medium filling mode from the tank 10 to the heat collecting panel 1 from the direction switching valve 18, the first pump 50, the first branch connection part 40, the second pump 60, the heat exchanger 16, and the outward opening / closing valve 20. From the first pump 50, the first branch connection 40, the second pump 60, the heat exchanger 16, the forward opening / closing valve 20, the heat collecting panel 1, the second branch connection 42, and the direction switching valve 18 to the first pump 50. The third heat medium filling mode in which the circulation of the above is performed can be performed. At this time, the air in the pipe is vented in the third heating medium filling mode, but in the final air venting process by the first pump that becomes a large discharge source, the first pump and the second pump are arranged in parallel as in the prior art. Therefore, there is no flow path loss caused by branching and supplying the heat medium returning from the return path to both the first and second pumps and joining them downstream of the second pump. That is, as shown in FIG. 3, the heat medium recirculating from the return path is from the second branch connection portion 42 to the direction switching valve 18, the first pump 50, the first branch connection portion 40, the second pump 60, the heat exchanger 16, Since the first and second pumps 50 and 60 are connected in series without causing branching and merging of the heat medium as in the forward opening / closing valve 20, the pressure loss can be significantly reduced. In the actual machine test, the heating medium filling operation, which required about 20 minutes by the conventional method, could be completed in about 4 minutes while maintaining more reliable air bleeding accuracy.

  Next, the action of the in-pipe air vent mechanism of the embodiment will be described together with the in-pipe air vent method with reference to the drawings. In the solar hot water system of the present embodiment, the air venting operation in the pipe is accompanied by the filling work into the circulation path piping of the heat medium, the height difference between the ground where the heat storage tank 2 is installed and the heat collecting panel 1, the wall surface and the roof surface. Due to the problem that air stays in the pipe at the pipe part curved downward when the heat medium is filled due to the circumvention of the heat medium, etc., which reduces the function of transporting the heat medium by the pump and thus impairs the function of generating hot water Simultaneously with filling, it takes place in the final stage of the filling operation. That is, first, the heating medium is filled into the circulation path pipe, and then the air supply in the pipe is vented when the heating medium is turned off and the heating medium is circulated in the circulation path for a required time.

  FIG. 1 shows a path (return path filling) in which the heat medium is pumped and filled into the reserve tank 24 of the heat collecting panel 1 in the upward direction of the return path with reference to the heat medium storage tank. FIG. 2 shows a path (outward path filling) in which the heat medium is pumped and filled in the reserve tank 24 of the heat collecting panel 1 in the outward direction with respect to the heat medium storage tank. FIG. 3 shows that the supply of the heat medium storage tank 10 is stopped, the heat medium is pumped and filled in the forward direction starting from the first pump 50, and the first heat is passed from the heat collection panel 1 via the direction switching valve 18. A route for circulating the process of returning to the pump 1 is indicated by a bold line.

1 is the first step, and when this step is performed, the direction switching valve 18 communicates only the heat medium storage tank 10 and the first pump 50 (hi route). Set to do. At this time, the return path on-off valve 22 is set to open, and the forward path on-off valve 20 is closed. When the first pump 50 comprising an electromagnetic pump or the like is driven in this state, the heat medium passes through the heat medium storage tank 10, the direction switching valve 18, the first pump 50, the first branch connection portion 40, and the return opening / closing valve 22. Then, it is pumped to the reserve tank 24 of the heat collecting panel 1. When one liquid level sensor of the reserve tank 24 detects the liquid level that does not overflow to the forward-side heat medium flow connection port, the first pump 50 is stopped by a stop signal from a controller (not shown). Then, the heating medium filling work on the return path is completed.

  Next, the forward filling process of the heat medium in FIG. 2 is a second process, and when this process is performed, the direction switching valve 18 has the heat medium storage tank 10 and the first pump 50 as in the first process. And (hi route) are set to communicate with each other. At this time, the return path on / off valve 22 is set to be closed and the forward path on / off valve 20 is opened. When the first pump 50 comprising an electromagnetic pump or the like is driven in this state, the heat medium is set in the heat medium storage tank 10, the direction switching valve 18, the first pump 50, the first branch connection portion 40, and the free flow path state. The pressure is fed to the reserve tank 24 of the heat collecting panel 1 through the second pump 60, the heat exchanger 16, and the forward path opening / closing valve 20. As described above, in the second step, the first pump moves the heat medium from the heat medium storage tank toward the forward Q direction with respect to the heat medium storage tank in the circulation path from the upstream side of the second pump. The heat collecting panel is filled with a heat medium by pressure feeding. When the other liquid level sensor of the reserve tank 24 detects the liquid level that does not overflow to the return side heat medium flow connection port, the first pump 50 is stopped by a stop signal from a controller (not shown). Then, the heating medium filling work on the return path is completed. In the reserve tank 24, the return side and the forward side are separately driven, and the respective liquid surface levels are detected to prevent the heat medium liquid from joining or overflowing, thereby generating bubbles including air. These are prevented from being circulated in the piping and retained.

  Next, the heating medium circulation driving process of FIG. 3 in which the heating medium is driven in a state in which the piping of the circulation path is filled with the heating medium according to FIGS. 1 and 2 is a third process, and this process is performed. At that time, the direction switching valve 18 communicates only the (ij path), and the supply from the heat medium storage tank 10 to the first pump 50 is shut off. At this time, the return path on / off valve 22 is set to be closed and the forward path on / off valve 20 is opened. When the first pump 50 and the second pump made of an electromagnetic pump or the like are driven together in this state, the heat medium is the first pump 50, the first branch connection portion 40, the second pump 60, the heat exchanger 16, Circulation that flows to the direction switching valve 18 side in the second branch connection section 42 from the reserve tank 24 through the circulation return path 3B through the circulation path 3A of the forward path on-off valve 20 and the heat collecting panel 1 and returns to the first pump 50 The circulation path T is driven repeatedly. In this third step, the high-discharge first pump 50 is driven simultaneously with a relatively large flow rate second pump in series piping, so that the heating medium is conveyed and driven by a large discharge force and transport force. By connecting the first and second pumps in series, the resistance loss of the fluid is greatly reduced. As a result, the heating medium filling operation into the pipe can be completed in a short time, and at the same time, bubbles and air stay in the vicinity of the roof surface of the pipe can be eliminated and the hot water generating function can be maintained.

  In the above embodiment, the counterclockwise direction of the path is the forward path and the clockwise direction is the return path, but this is provisionally set to be counterclockwise or clockwise based on the heat medium storage tank 10. On the contrary, the heat medium flow path may be set with the counterclockwise direction of the embodiment as the backward path and the clockwise direction as the forward path. In addition, the heating medium filling sequence may be reverse to the embodiment, first the forward path side is filled, then the backward path is filled, and the last air vent circulation method may be circulated around the backward path. As in the embodiment, the return path is directly connected to the reserve tank of the heat collection panel in the figure, whereas the forward path is installed before the heat exchanger or the heat collection panel itself reaches the reserve tank. Therefore, the pressure loss is high, and by performing the filling sequence as in the embodiment in that respect, the heat medium can be sufficiently filled in the pipe with the pipe without loss first, so that the filling accuracy and work time are Shortening is more advantageous.

  As described above, the first pump 50 is branched and connected in a T shape to the circulation path 3 on the upstream side of the second pump 60, and one end side of the direction switching valve 18 is T-shaped on the circulation path 3 on the downstream side of the return path. Therefore, the air venting operation in the final finishing of the filling operation of the heat medium into the pipe can be performed in a short time and with high accuracy.

  The in-pipe air venting mechanism and method in the solar hot water system of the present invention are not limited to the configuration of the above-described embodiment, and may be arbitrarily modified without departing from the essence of the invention described in the claims. May be.

DESCRIPTION OF SYMBOLS 1 Heat collection panel 2 Thermal storage tank 3 Circulation path 3A Circulation outward path 3B Circulation return path 5 In-pipe air venting mechanism 10 Heat medium storage tank 16 Heat exchanger 18 Direction switching valve 20 Outward opening / closing valve 22 Return path opening / closing valve 40 First branch connection part 42 Second branch connection portion 50 First pump 60 Second pump 100 Pipe connection portion Q Forward direction upward direction R Return direction upward direction

Claims (2)

Piping a heat collecting panel, a heat exchanging part for exchanging heat between the heat medium heated by the heat collecting panel and water, and a circulation drive mechanism for circulatingly driving the heat medium between the heat collecting panel and the heat exchanging part It is an air venting mechanism in a pipe in a solar hot water system that is connected to form a circulation path of a heat medium,
The in-pipe air venting mechanism is provided also as a circulation drive mechanism,
A first pump for quantitatively discharging the heat medium from the heat medium storage tank in one direction and supplying the heat medium to the piping of the circulation path;
A turbo-type second pump provided in the vicinity of the first pump and interposed in a circulation path;
First and second on-off valves for opening and closing the path, which are interposed in each of the forward path and the return path based on the heat medium storage tank in the circulation path;
A direction switching valve provided at a pipe connection portion between the first pump, the heat medium storage tank, and the return path;
A first branch connection section in which the first pump is pipe-connected to the circulation path pipe on the upstream side with respect to the upstream direction of the second pump;
And a second branch connection portion that pipe-connects a direction switching valve downstream from the return upstream direction of the second open / close valve on the return path side, and the air in the pipe in the solar water heating system Unplug mechanism. Piping a heat collecting panel, a heat exchanging part for exchanging heat between the heat medium heated by the heat collecting panel and water, and a circulation drive mechanism for circulatingly driving the heat medium between the heat collecting panel and the heat exchanging part It is a method for venting air in a pipe in a solar hot water system that is connected to form a circulation path of a heat medium,
In the circulation drive mechanism, the first pump that discharges the heat medium from the heat medium storage tank only in one direction and supplies the heat medium to the circulation path piping, and the circulation path piping in the vicinity of the first pump. A second pump with a turbo drive disposed in the vicinity of the heat exchange unit and a plurality of valves interposed in the circulation path,
The heat medium from the heat medium storage tank is pumped by the first pump in either the upward direction of the return path or the upward direction of the forward path based on the heat medium storage tank in the circulation path, and the heat medium is supplied to the heat collecting panel. A first step of filling;
The heat medium from the heat medium storage tank after the first step is in either the forward direction or the reverse direction based on the heat medium storage tank in the circulation path from the upstream side of the second pump, A second step in which the heat collecting panel is filled with a heat medium by being pumped by the first pump in the opposite direction to the first step;
The first pump connected in series with the first pump connected in series so that the supply of the heat medium from the heat medium storage tank is shut off and the first pump is positioned upstream in either the forward or backward direction of the circulation path And a third step of connecting the two pumps to the circulation path, pumping the heat medium by the first and second pumps, and circulating the circulation path to bleed the air in the pipe. Air venting method for piping in solar hot water systems.

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