JPH0123083Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a vacuum glass tube type solar heat collecting device that simplifies the water draining operation.

Figure 1 shows an overview of the solar heat utilization system. Water in the heat storage tank 1 is sent by a pump 2 to a vacuum glass tube type solar heat collector 4 via a water supply pipe 3, and is heated while flowing through the solar heat collector 4 and then flows through a water pipe 5. The heat is sent to the heat storage tank 1 again through the heat storage tank 1 and circulated. This water becomes hot water at a high temperature each time the circulation is repeated, and is sent to the required location via the hot water supply pipe 6.
As the hot water is supplied, water is supplied to the heat storage tank 1 via the water supply pipe 7. On the other hand, when there is a concern that the water may freeze, such as at night in a cold region, the pump 2 is stopped and the water in the solar heat collector is returned to the heat storage tank 1.

Next, the solar heat collector 4 will be explained with reference to FIGS. 2 and 3. The solar heat collecting device 4 is constructed of one module in which several heat collecting tubes 10 are arranged in parallel, and FIG. 3 shows an arrangement in which two modules are connected in series. Heat collection tube 1
0 is constructed by incorporating a heat collecting plate 12 in a transparent vacuum glass tube 11, and a heat collecting pipe 13 which is joined to the heat collecting plate 12 for good heat conduction and forms a double tube. The inner tube 13A and the outer tube 13B of the heat collecting tube 13 form an outgoing path and a returning path for water flowing through the heat collecting tube 13. Reference numeral 15 denotes an inlet side header pipe, on the outer periphery of which the ends of the inner pipes 13A of the heat collecting pipes 13 are connected and communicated in parallel. This inlet side header pipe 1
5 has a pipe joint 16 at one end and is connected via the pipe joint 16 to the water supply pipe 3 or an outlet side header pipe provided in the other module, which will be described later, and the other end is sealed. Reference numeral 17 denotes an outlet side header pipe, on the outer periphery of which the ends of the outer pipes 13 of the heat collecting pipes 13 are connected and communicated in parallel. One end of this outlet side header pipe is connected to the water supply pipe 5 or the pipe joint 16 of the other module, and the other end is a connecting pipe 19 having an on-off valve 18.
It is connected to the pipe joint 16 by.

The solar heat collecting device 4 has an on-off valve 18 when collecting heat.
is closed, and the water sent from the water supply pipe 3 by the pump 2 is sequentially transferred to the inlet header pipe 15, the heat collecting pipe 13, the inner pipe 13A, and the water as shown by the solid arrow.
The water pipe 5 flows through the outer pipe 13B and the outlet side header pipe 17.
sent to. While flowing through the heat collecting pipe 13, it receives solar heat collected from the heat collecting plate 12 and is heated. Pump 2 is stopped when water is drained, and on-off valve 1
8 will be opened each. As a result, the water in the heat collecting pipe 13 flows as shown by the broken arrow and is returned to the heat storage tank 1.

However, in the above-mentioned solar heat collector, it is necessary to open and close the on-off valve 18 each time water is drained, and in the case of a manual valve, the water draining operation is extremely difficult. Furthermore, when using an automatic valve, the manufacturing cost increased significantly.

The purpose of this invention is to provide a vacuum glass tube type solar heat collecting device that eliminates the above-mentioned drawbacks and is inexpensive to manufacture and can be easily drained.

Hereinafter, embodiments of this invention will be described based on the drawings. In the figures, parts common or identical to those in FIGS. 1 to 3 are designated by the same reference numerals.

In FIGS. 4 and 5, the inlet header pipe 15 is provided with a pipe joint 20. As shown in FIGS. The pipe joint 20 is
One end 21a is connected to the inlet side header pipe 15, and the other end 21b is connected to the outlet side header pipe 17 of the other module.
Or the joint body 21 connected and communicated with the water supply pipe 3
and a thin tube 2 that branches off from the middle of the joint body 21 and is connected to the end of the outlet side header tube 17 on the opposite side to water supply.
It consists of 2. The thin tube 22 is approximately 1/5 of the joint body 21
It is a small-diameter pipe with a diameter of , and the branch portion projects at right angles into the pipe of the joint body 21, and the opening surface 22a is inclined as shown in FIG. 5 with respect to the water supply direction indicated by the solid arrow. Between each module of the solar heat collector,
Alternatively, the module and the water supply pipe 3 are connected to the pipe joint 2.
Connected by 0.

In the above configuration, during heat collection, water sent from the water supply pipe 3 flows as shown by the solid arrow,
While flowing through the heat collecting pipe 13, it is heated and sent to the water pipe. At this time, the water sent from the water supply pipe 3 flows into the capillary tube 22 of the pipe joint 20 because the capillary tube 22 is extremely thin compared to the joint body 21 as described above, and because the vicinity of the opening surface 22a of the capillary tube 22 is under negative pressure. Because of this, the amount of heat is extremely small, and therefore there is almost no reduction in the heat collection efficiency of the solar heat collection device.
Next, when draining water, only the stop operation of the pump 2 is performed, and by stopping the pump 2, the water in the heat collection pipe 13 flows as shown by the broken arrow and returns to the heat storage tank 1. At this time, the water in the upper module flows through the outlet side header pipe 17 of the lower module and enters the thin tube 2.
2 increases the flow rate and flows into the water supply pipe 3. Draining the water therefore takes no additional time and is carried out very conveniently.

As described above, according to this invention, a solar heat collector is constructed by providing a thin tube that connects and communicates the upstream side of the heat collecting pipe connection part of the inlet side header pipe with the opposite end of the outlet side header pipe for water supply. Since there is no need for an on-off valve for draining water, manufacturing costs are lower than in the past, draining water is easy and smooth, and the solar heat collector maintains the same level of heat collection efficiency as before.

[Brief explanation of drawings]

Figure 1 is a system diagram of the solar heat utilization system, Figure 2 is a perspective view of a vacuum glass tube type solar heat collector, and Figure 3 is a system diagram of the solar heat utilization system.
The figure is a plan view of a conventional device, FIG. 4 is a plan view of a solar heat collector showing an embodiment of this invention, and FIG. 5 is a front view of a pipe joint. 4... Vacuum glass tube type solar heat collector, 10...
... Heat collecting element tube, 11 ... Vacuum glass tube, 13 ... Heat collecting tube, 15 ... Inlet side header pipe, 17 ... Outlet side header pipe, 20 ... Pipe joint, 22 ... Thin tube.

Claims (1)

[Claims for Utility Model Registration] A plurality of heat collecting element tubes in which water flows through the heat collecting tubes are built into vacuum glass tubes, and the water inlet sides of the heat collecting tubes are connected and communicated in parallel to each other, and the water is fed from one end. an inlet-side header pipe that diverts water from the heat-collecting pipe to the heat-collecting pipe; an outlet-side header pipe that connects and communicates the water outlet sides of the heat-collecting pipes in parallel with each other to collect the water that has flowed through the heat-collecting pipe and sends it out from one end; and a heat-collecting pipe. , a vacuum glass tube comprising a header cover that covers an inlet header pipe and an outlet header pipe, and a plurality of modules configured such that both ends of the outlet header pipe and the inlet header pipe protrude from the header cover. type solar heat collector, the joint body has one end connected to the inlet header pipe of the module and the other end connected to the outlet header pipe or water supply pipe of another module, and a joint body branching from the middle of the joint body and having the A vacuum glass tube type solar heat collector characterized in that a tube joint consisting of a thin tube connected to and communicating with the end of each outlet side header tube of the module on the side opposite to the water supply is provided.