JPH0331799Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a snow melting system for preventing snow from accumulating on roofs or from freezing and snow accumulating on roads and parking lots in cold regions.

(Prior Art) In a conventional snow melting system, for example, a heat dissipation pipe is buried in a road or a parking lot, and a heat medium heated to a predetermined temperature by a boiler is circulated within the heat dissipation pipe by the drive of a circulation pump. The heat released from the heat dissipation pipes was used to prevent roads and parking lots from freezing and snowing.

(Problem to be solved by the invention) However, in cold regions, the temperature of the heat medium passing through the heat dissipation pipe drops significantly, and this temperature drop increases the viscosity of the heat medium, and
With the addition of resistance acting on each pipe, joint, etc., circulation of the heat medium within the heat dissipation pipe becomes extremely poor. For this reason, the pressure of the heat medium sent by the circulation pump becomes high, causing problems such as damage to pipes, joints, etc., and electrical troubles.

(Means for solving the problem) In the snow melting system of the present invention, a supply pipe and a discharge pipe are connected to a boiler that heats a heat medium to a predetermined temperature, and a heat dissipation pipe is connected to the supply pipe and discharge pipe. In a snow melting system configured such that a heat medium heated by a boiler is circulated through a supply pipe, a heat radiation pipe, and a discharge pipe by driving a circulation pump provided in the supply pipe, the supply pipe and A bypass pipe is connected between the discharge pipes, and an on-off valve is provided in this bypass pipe, and the opening and closing of this on-off valve is controlled by a control device.

(Function) By controlling the opening and closing of the on-off valve with the control device,
The route of the heat medium to be supplied is appropriately switched to prevent the pressure of the heat medium from increasing in the pipes.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a snow melting system according to the present invention.

In the figure, 1 is a boiler that heats a heat medium to a predetermined temperature. One end of a supply pipe 2 is connected to the supply port 1a of the boiler 1.
The other end is connected to the collecting pipe 5 on the supply side via the circulation pump P.
It is connected to the. In addition, the intake port 1 of boiler 1
One end of a discharge pipe 3 is connected to b, and the other end of this discharge pipe 3 is connected to a collecting pipe 6 on the return side. A suitable number of heat radiating pipes 7 are branched from the collecting pipe 5 on the supply side, and these heat radiating pipes 7 are communicated with the collecting pipe 6 on the return side. The heat dissipation pipe 7 is installed in a place where freezing and snow accumulation is to be prevented in a cold region, and is buried in a road or a parking lot A, for example. Alternatively, it may also be placed on the roof or the like.

In addition, a bypass pipe 8 is provided between the collecting pipe 5 and the collecting pipe 6.
is connected, and this bypass pipe 8 is provided with an electromagnetic on-off valve 10.

Furthermore, a pressure tank 11 is provided between the circulation pump P and the collecting pipe 5 in the supply pipe 2 . As shown in FIG. 2, the pressure tank 11 is configured such that a portion of the heat medium supplied by the circulation pump P flows into the pressure tank 11 as shown by the arrow. In this pressure tank 11, a compressed medium liquid Y for compressing the heat medium X from above is stored together with the heat medium X, and furthermore, residual air Z exists in the upper space.

This pressure tank 11 is provided with a pressure switch 12. The pressure switch 12 turns on when the pressure in the pressure tank 11 exceeds a predetermined pressure, opens the electromagnetic on-off valve 10 provided in the bypass pipe 8, and turns off when the pressure falls below a predetermined pressure.
Then, the solenoid on-off valve 10 is closed. The pressure when the pressure switch 12 switches from OFF to ON,
The pressure when switching from ON to OFF may be set appropriately. Reference numeral 13 is a pressure gauge.

Next, the operation of the snow melting system configured as above will be explained.

The heat medium X heated to a predetermined temperature in the boiler 1 is circulated through the supply pipe 2, the heat radiation pipe 7, and the discharge pipe 3 by driving the circulation pump P. During this circulation, the heat of the heat medium X is released from the heat dissipation pipe 7 to prevent roads and parking lots A from freezing or snowing. Here, in severe cold, the temperature of the heat medium X decreases rapidly when passing through the heat dissipation pipe 7 buried in the road or parking lot A, so the viscosity of the heat medium X increases and the inner wall of each pipe The circulation of the heat medium X is significantly worsened due to the resistance acting on the heat medium.
Therefore, the pressure of the heat medium X sent by the circulation pump P increases. In this way, when the pressure of the heat medium flows to As a result, the pressure of the heat medium X is reduced, and damage to pipes, joints, etc. and electrical troubles caused by an increase in the pressure of the heat medium X are prevented.

Next, the pressure of the heat medium X decreases and the pressure tank 11
When the internal pressure falls below the predetermined pressure, pressure switch 1
2 is turned off, the electromagnetic on-off valve 10 closes, and the bypass pipe 8 is closed. Then, the heat medium X slowly flows through the heat radiation pipe 7 again. By repeating the above operations, the heat medium X can circulate through the heat dissipation pipe 7 without causing any trouble due to the pressure increase of the heat medium X.

FIG. 3 shows another embodiment of the snow melting system according to the present invention. Note that the same members as those in the above embodiment are given the same reference numerals.

This snow melting system uses a timer switch 20 as a control device for controlling the opening and closing of the electromagnetic on-off valve 10.

The timer switch 20 is turned on and off sequentially by a timer set at a predetermined time, and when a predetermined time elapses, it turns on and opens the electromagnetic on-off valve 10, and then when a predetermined time elapses, it turns off. Close the electromagnetic on-off valve 10.

The operation of this snow melting system is the same as that of the previous embodiment except that the opening/closing control of the electromagnetic on-off valve 10 is performed by the timer switch 20, and the explanation thereof will be omitted here.

FIG. 4 shows still another embodiment of the snow melting system according to the present invention. Note that the same members as those in the above embodiment are given the same reference numerals.

This snow melting system is a combination of the two embodiments described above, and is provided with the pressure switch 12 and the timer switch 20 as control devices for controlling the opening and closing of the electromagnetic on-off valve 10, respectively.

In FIG. 4, reference numeral 30 indicates a bypass pipe connected to the supply pipe 2 so as to bypass the pressure tank 11, and 31, 32, and 33 indicate valves. Therefore, this snow melting system includes valves 31, 32, 3.
By opening and closing 3, the opening and closing of the electromagnetic on-off valve 10 can be controlled by either the pressure switch 12 or the timer switch 20, which can be used as appropriate to perform optimal control according to the situation. . Further, the pressure switch 12 and the timer switch 20 may be used for parallel control.

(Effects of the invention) As described above, according to the invention, by controlling the on-off valve provided in the bypass pipe to open and close using an appropriate control device, it is possible to prevent an abnormal pressure increase in the heat medium and to Damage to joints, joints, etc. and electrical troubles can be prevented.

[Brief explanation of drawings]

Figures 1 and 2 show the snow melting system according to the present invention, Figure 1 is a configuration diagram showing the outline of the snow melting system, Figure 2 is a longitudinal side view showing the configuration of the pressure tank, and Figure 3 is the snow melting system according to the present invention. Fig. 4 is a block diagram showing still another embodiment of the snow melting system according to the present invention. DESCRIPTION OF SYMBOLS 1... Boiler, 2... Supply pipe, 3... Discharge pipe, 7... Heat radiation pipe, 8... Bypass pipe, 10... Solenoid on-off valve, 12... Pressure switch (control device), 20... Timer Switch (control device).

Claims (1)

[Claims for Utility Model Registration] 1. A supply pipe and a discharge pipe are connected to a boiler that heats a heat medium to a predetermined temperature, and a heat radiation pipe is connected to these supply pipes and discharge pipe, and the supply pipe is provided with a heat dissipation pipe. In a snow melting system configured such that a heat medium heated by a boiler is circulated through a supply pipe, a heat radiation pipe, and a discharge pipe by driving a circulation pump, a bypass pipe is connected between the supply pipe and the discharge pipe. A snow melting system characterized in that the bypass pipe is provided with an on-off valve, and the on-off valve is controlled to open and close by a control device. 2. The snow melting device according to claim 1, wherein the control device is a pressure switch that controls the opening and closing of an on-off valve based on the pressure in a pressure tank provided in a supply pipe downstream of the circulation pump. system. 3. The snow melting system according to claim 1, wherein the control device is a timer switch.