JP4351582B2 - Automatic shut-off valve for heat storage circuit - Google Patents

Description

  The present invention relates to a heat storage circuit in which a heat storage unit is provided in a pipe line through which a heat medium flows.

  Generally, a heat storage circuit stores heat of a heat source with a heat storage unit, connects the heat storage unit to a heating device with a pipe, and connects a return pipe from the heating device to the heat source.

As a conventional heat storage circuit, an automobile heat storage circuit is known (see, for example, Patent Document 1).
JP-A-4-231847 (page 4, FIG. 1)

Patent document 1 is demonstrated based on the following figure.
FIG. 9 is a diagram for explaining the basic principle of the prior art. In the heating and cooling circuit 100, a cooling circuit 101 includes a radiator 102, an engine circuit 103 includes an engine 104, and a three-way valve 105, a water pump 106, and the like. And a cooler return circuit 107 and a connection duct 108, and further, a heat storage means 110, a heating heat exchanger 111, a heating return means 112, and a valve 113 are provided in the heating circuit 109.

The heat medium passing through the engine 104 proceeds to the three-way valve 105 and returns to the engine 104 via the water pump 106 if the operating temperature has not been reached.
The heat medium deprived of heat by the heat storage means 110 proceeds to the heating heat exchanger 111 via the heating circuit 109, and returns to the engine 104 via the heating return means 112, the valve 113, the connection duct 108, and the water pump 106.

  Incidentally, the heat storage means 110 is filled with or contains a heat storage material. Various materials can be used as the heat storage material, but paraffin is preferred. This is because paraffin does not worry about corroding metals.

  However, if the wall containing the paraffin-based heat storage material is broken, a secondary problem occurs. That is, since the paraffin-based heat storage material is insoluble in the cooling water, if it leaks out, it may clog the flow path of the device in the heat storage circuit and reduce or stop the function of the heat storage circuit.

  It is an object of the present invention to provide an automatic shut-off valve for a heat storage circuit that can maintain the function of equipment in the heat storage circuit normally even if a heat storage material insoluble in a heat medium such as cooling water leaks into the heat storage circuit. Let it be an issue.

According to the first aspect of the present invention, a heat storage source in which a heat source such as an engine is provided in a pipe line through which a heat medium such as cooling water flows, and a heat storage material insoluble in the heat medium is incorporated at a position downstream from the heat source. In the heat storage circuit where the unit is installed in the pipeline and the heat of the heat source can be stored in the heat storage unit,
An automatic shut-off valve is provided in the pipeline at a position downstream from the heat storage unit,
This automatic shut-off valve has a bypass channel for bypassing the heat medium and a main channel for allowing the heat medium to pass therethrough, a valve opening mechanism for opening the valve in the bypass channel, and an upstream position from the valve opening mechanism. When the heat storage material leaks from the heat storage unit, the bypass passage is provided with a cooling unit that solidifies the insoluble heat storage material.
When the heat storage material leaks, the valve is closed so that the flow of the heat medium can be stopped.

Since the automatic shut-off valve includes a bypass flow path that bypasses the heat medium and flows along with the main flow path that passes the heat medium, the heat medium that flows through the heat storage circuit can be branched and flow.
As a result, the opening and closing of the valve can be controlled using this branched flow.

Moreover, since the automatic shut-off valve is provided with a valve opening mechanism that opens the valve in the bypass flow path, the opening and closing of the valve can be determined depending on how the heat medium flows in the bypass flow path.
Furthermore, since the automatic shut-off valve has a cooling part in the bypass flow path located upstream from the valve opening mechanism, when the insoluble heat storage material leaks from the heat storage unit and passes through this cooling part, the heat storage material is automatically removed. It can be solidified.

In the invention according to claim 1, when a heat storage material insoluble in a heat medium such as cooling water leaks from the heat storage unit into the heat storage circuit, the cooling unit is provided in the bypass passage provided in the automatic shutoff valve on the downstream side of the heat storage unit. Since it is provided, this insoluble heat storage material can be cooled and solidified.
In the automatic shut-off valve, when the heat storage material cools and solidifies in the bypass flow path, the heat medium stops flowing in the bypass flow path, and the valve opening mechanism provided in the bypass flow path stops and the valve can be closed.
Accordingly, it is possible to provide an automatic shut-off valve for a heat storage circuit that can keep the functions of the devices in the heat storage circuit normal even when a heat storage material insoluble in a heat medium such as cooling water leaks into the heat storage circuit.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a diagram showing a heat storage circuit according to the present invention. The heat storage circuit 10 is provided with a heat source 12 such as an engine or a motor in a pipe 11 through which a heat medium such as cooling water made of an ethylene glycol aqueous solution flows. A heat storage unit 13 containing a heat storage material such as paraffin that is insoluble in the heat medium is interposed downstream of the heat source 12, and a heater 15 of the air conditioner is interposed downstream of the heat storage unit 13. In this circuit, a water pump 17 is provided in the vicinity of the heat source 12, and an automatic shut-off valve 20 is provided in the pipe line 11 at a position downstream from the heat storage unit 13. A circuit including the radiator 14 and the thermostat 16 is a cooling circuit for the heat source 12.

  FIG. 2 is an exploded perspective view of the automatic shut-off valve according to the present invention, in which the main body 21 of the automatic shut-off valve 20 is divided in half at the center, and the concave portions of the portions appearing on the inner side 22 and the convex portions of the outer side 23 And a valve opening mechanism 40 provided in the center.

The automatic shutoff valve 20 is provided with a main flow path 24 on the inner side 22 of the main body 21, and a first bypass flow path 25 and a second bypass flow path 26 are provided above and below the main flow path 24. A cooling part 27 is provided in a part of 25, and includes a fin 28 provided in the cooling part 27, recesses 29, 31, 32, and a valve opening mechanism 40 that fits in these recesses 29, 31, 32.
The valve opening mechanism 40 includes a worm gear shaft 43 that connects the upper blade 41 and the lower blade 42, and a movable valve 45 that includes a screw hole 44 that moves up and down along the worm gear shaft 43.

  FIG. 3 is a cross-sectional view of the automatic shutoff valve according to the present invention. The automatic shutoff valve 20 bypasses the heat medium together with the main flow path 24 through which the heat medium passes through the inner side 22 of the main body 21. And a second bypass flow path 26, and a valve opening mechanism 40 that opens a valve in the recess 29 of the main flow path 24, the recess 31 of the first bypass flow path 25, and the recess 32 of the second bypass flow path 26 is provided. In addition, when the heat storage material leaks from the heat storage unit 13 (see FIG. 1) to the first bypass passage 25 at a position upstream from the valve opening mechanism 40, a cooling unit that solidifies the insoluble heat storage material. 27, and when the heat storage material leaks, the valve is closed so that the flow of the heat medium can be stopped.

  The valve opening mechanism 40 includes an upper blade 41, a lower blade 42, a worm gear shaft 43, and a movable valve 45, and the upper blade 41 includes a plurality of blades 46. The lower blade 42 is composed of a plurality of blades 48... And a root portion 49 of these blades 48.

FIG. 4 is an operation diagram of the automatic shut-off valve when the heat storage unit is operating normally.
In the automatic shut-off valve 20, the heat medium enters as indicated by an arrow A, branches into the main flow path 24, the first bypass flow path 25, and the second bypass flow path 26 as indicated by an arrow B and is stored in the recess 31. And the blades 48... Stored in the recess 32 are rotated. At this time, since the force to move the movable valve 45 in the opening direction is set larger than the force to move the movable valve 45 in the closing direction, the blades 46... Rotate as indicated by the arrow C, and the blades 48. The worm gear shaft 43 is rotated as indicated by an arrow C, and the worm gear shaft 43 connected at the base portions 47 and 49 of the blades 46... And 48 is rotated as indicated by an arrow C. When it stops moving, the rotation of the blades 46... And the blades 48... Stops and the heat medium flows downstream as indicated by an arrow E.

  Specific measures for making the movable valve 45 open are, for example, making the blades 46... Larger than the blades 48 and increasing the rotational moment of the blades 46. The diameter of the bypass flow path 25 is set larger than the diameter of the second bypass flow path 26 so that a larger amount of heat medium flow is applied to the blades 46.

  Thus, since the automatic shut-off valve 20 includes the first bypass flow path 25 and the second bypass flow path 26 that bypass the heat medium together with the main flow path 24 through which the heat medium passes, the heat medium flowing through the heat storage circuit is provided. The flow can be branched and the opening and closing of the valve can be controlled using this branched flow.

  Further, since the automatic shut-off valve 20 is provided with a valve opening mechanism 40 that opens the valve in the bypass flow path, the opening and closing of the valve can be determined depending on how the heat medium flows in the bypass flow path.

FIG. 5 is an operation diagram of the automatic shut-off valve when the heat storage material flows into the heat storage circuit.
In (a), the heat storage material enters the main flow path 24 as indicated by an arrow F, and as indicated by the arrow G, a state in which the heat storage material starts to branch into the main flow path 24, the first bypass flow path 25, and the second bypass flow path 26 is illustrated. Then, since the heat medium flows from the upstream side to the downstream side as indicated by arrows A, B, and E, the movable valve 45 remains in the state of movement to the upper limit of the arrow D.

  (B) shows a state in which the heat storage material is cooled by the cooling unit 27 and the first bypass passage 25 is blocked as the solidified heat storage material 51. In this state, the heat medium does not flow into the first bypass passage 25. Therefore, the heat medium is limited to the flow of the arrows A, B, E in the main flow path 24 and the flow of the arrow B in the second bypass flow path 26, and the blade 48 ..., the blade 46 ..., and the worm gear shaft. 43 rotates as shown by an arrow H, and the movable valve 45 moves in a direction of dropping as shown by an arrow J.

In (c), the movable valve 45 is lowered from the state (b) to the lower limit, and the main flow path 24 and the second bypass flow path 26 are completely blocked.
The automatic shut-off valve 20 tries to keep the heat medium flowing from the arrow A to B and the heat storage material from the arrow F to G. However, since the movable valve 45 stays at the lower limit as shown by the arrow J, the flow of these fluids eventually stops. be able to.

  As described above, when the heat storage material cools and solidifies in the first bypass flow path 25, the automatic shutoff valve 20 stops the heat medium from flowing into the first bypass flow path 25, and the valve opened in the first bypass flow path 25 is opened. The opening of the valve of the mechanism 40 stops and the valve can be closed.

As a result, the heat storage circuit 10 does not operate, and there is no possibility that the function of each component of the heat storage circuit 10 is impaired.
Accordingly, it is possible to provide an automatic shut-off valve for a heat storage circuit that can keep the functions of the devices in the heat storage circuit normal even when a heat storage material insoluble in a heat medium such as cooling water leaks into the heat storage circuit.

  FIG. 6 is a diagram showing another embodiment of FIG. 3, and the automatic shut-off valve 60 includes a bypass channel 64 that bypasses the heat medium and flows along with the main channel 63 that passes the heat medium inside the main body 61. The bypass passage 64 includes a cooling unit 65 that solidifies the insoluble heat storage material when the heat storage material leaks from the heat storage unit 13 (see FIG. 1). The cooling unit 65 extends to the back side of the drawing. The valve opening mechanism 70 is provided so as to fit the fin 66 and the recess inner wall 68 of the recess 67 of the bypass flow path 64, and the heat storage material leaks in the cooling unit 65 provided upstream of the valve opening mechanism 70. The heat storage material is solidified and the flow of the heat medium can be stopped by closing the valve.

The valve opening mechanism 70 has an outer wall 73 of the spring accommodating portion 72 of the piston 71 along the inner wall 68 of the recess, and a compression coil spring 75 interposed along the inner wall 74 of the spring accommodating portion 72. The ball 78 is configured to be pressed by the tip portion 77 of the push rod 76 provided in FIG.
Reference numeral 79 denotes a packing that fits with the sphere 78 when the sphere 78 closes the main flow path 63.

FIG. 7 is an operation diagram of the automatic shut-off valve of FIG. 6 when the heat storage unit is operating normally.
In the automatic shut-off valve 60, the heat medium enters as indicated by an arrow K, and branches into the main flow path 63 and the bypass flow path 64 as indicated by an arrow L.
At this time, the valve opening mechanism 70, the area _{S 1} of the bottom surface 81 of the spring housing portion 72 of the piston 71 is larger than the base area _{S 2} of the push rod 76, the force _F 1 by multiplying these areas _{S 1} and the pressure ( Since there is a relationship of F ₁ > F ₂ in the force F ₂ applied with pressure and the area S ₂ repelling F ₁ , the combined force of the reaction force of the compression coil spring 75 and the pressing force of the piston 71, The compression coil spring 75 moves downward as indicated by an arrow M, and the piston 71 moves downward as indicated by an arrow N, maintaining the state in which the ball 78 is pressed by the tip 77 of the push rod 76, and the heat medium is indicated by an arrow P. Flows downstream.

  The valve opening mechanism 70 includes a piston 71, a compression coil spring 75, and a ball 78, and only one bypass flow path 64 is required. Therefore, the valve can be opened and closed with a relatively simple mechanism.

FIG. 8 is an operation diagram of the automatic shut-off valve of FIG. 6 when a heat storage material flows out into the heat storage circuit.
(A) shows a state in which the heat storage material enters the main flow path 63 as indicated by the arrow Q and starts to branch into the main flow path 63 and the bypass flow path 64 as indicated by the arrow R. In this state, the heat medium is indicated by the arrows K and L. , P flows from the upstream side to the downstream side, so that the state where the compression coil spring 75 moves downward as indicated by the arrow M and the state where the piston 71 moves downward as indicated by the arrow N are maintained.

(B) shows a state where the heat storage material is cooled by the cooling unit 65 and the bypass flow path 64 is blocked as the solidified heat storage material 82.
In this state, since the heat medium does not flow into the bypass flow path 64, there is a pressing force of the compression coil spring 75, but the pressing force downward of the piston 71 is weak.

  When attention is paid to the sphere 78, the heat medium flows above the sphere 78 as indicated by arrows K, L, and P, and the flow velocity is large. On the other hand, there is a narrow gap below the sphere 78, but the flow rate of the heat medium flowing through this gap is small.

  The total pressure, which can be defined as dynamic pressure + static pressure = total pressure, has no difference above and below the sphere 78. The dynamic pressure is proportional to the square of the flow velocity. Above the sphere 78, since the flow velocity is large, the dynamic pressure is large, and as a result, the static pressure is small. Below the sphere 78, since the flow velocity is small, the dynamic pressure is small, and as a result, the static pressure is large. Due to the difference in static pressure, an upward force acts on the sphere 78, and the sphere 78 rises as shown by an arrow T.

(C) shows a state in which the sphere 78 has risen from the state of (b) to the upper limit and the main channel 63 is completely blocked.
In the automatic shut-off valve 60, the heat medium continues to flow from the arrow K to L and the heat storage material continues to flow from the arrow Q to R. However, the ball 78 remains at the upper limit as indicated by the arrow T, and the piston 71 works as a compression coil spring 75. The flow of these fluids can be stopped before long.

As a result, the heat storage circuit 10 does not operate, and there is no possibility that the function of each component of the heat storage circuit 10 is impaired.
Accordingly, it is possible to provide an automatic shut-off valve for a heat storage circuit that can keep the functions of the devices in the heat storage circuit normal even when a heat storage material insoluble in a heat medium such as cooling water leaks into the heat storage circuit.

  In the automatic shut-off valves 20 and 60 of the present invention, the cooling method in the cooling units 27 and 65 is a cooling fin that cools with air. It does not matter even if it is made to do.

  The automatic shutoff valve for a heat storage circuit of the present invention is suitable for a heat storage circuit.

It is a figure which shows the thermal storage circuit which concerns on this invention. It is a disassembled perspective view of the automatic shutoff valve concerning the present invention. It is sectional drawing of the automatic cutoff valve which concerns on this invention. It is an effect | action figure of the automatic cutoff valve at the time of a heat storage unit operating normally. It is an action figure of an automatic shut-off valve when a thermal storage substance flows out into a thermal storage circuit. It is a figure which shows another Example of FIG. It is an effect | action figure of the automatic cutoff valve of FIG. 6 at the time of a heat storage unit operating normally. It is an effect | action figure of the automatic cutoff valve of FIG. 6 when a thermal storage substance flows out into a thermal storage circuit. It is a figure explaining the basic principle of the prior art.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Thermal storage circuit, 13 ... Thermal storage unit, 20 ... Automatic shut-off valve, 24 ... Main flow path, 25 ... 1st bypass flow path, 26 ... 2nd bypass flow path, 27 ... Cooling part, 40 ... Valve opening mechanism, 41 ... Upper blade, 42 ... Lower blade, 43 ... Worm gear shaft, 45 ... Movable valve, 60 ... Automatic shutoff valve, 63 ... Main flow path, 64 ... Bypass flow path, 65 ... Cooling section, 70 ... Valve opening mechanism, 71 ... Piston, 75: Compression coil spring, 78 ... Sphere.

Claims (1)

A heat source such as an engine is provided in a pipe for flowing a heat medium such as cooling water, and a heat storage unit containing a heat storage material insoluble in the heat medium is provided in the pipe at a position downstream from the heat source. In the heat storage circuit that can store the heat of the heat source in the heat storage unit,
An automatic shut-off valve is provided in the pipeline at a position downstream from the heat storage unit,
This automatic shut-off valve has a bypass channel for bypassing the heat medium and a main channel for allowing the heat medium to pass therethrough, a valve opening mechanism for opening the valve in the bypass channel, and an upstream position from the valve opening mechanism. In the bypass flow path, when the heat storage material leaks from the heat storage unit, a cooling unit for solidifying the insoluble heat storage material is provided,
An automatic shut-off valve for a heat storage circuit, characterized in that when the heat storage material leaks, the valve can be closed to stop the flow of the heat medium.

Images