Fluid temperature raising member and method for raising temperature of fluid

Abstract

To provide a fluid temperature raising member and a method for raising temperature of fluid that can reduce cost required for raising temperature of fluid.SOLUTION: A fluid temperature raising member includes an inner flow passage through which fluid can flow. The inner flow passage includes: an upstream side end part into which fluid flows; a narrow part provided in part of a flow passage direction and having a reduced flow passage cross-sectional area; and an upstream side inclined part that is inclined toward a side of the upstream side end part and toward an outside in a flow passage cross-sectional direction from the narrow part.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a fluid heating member and a fluid heating method for heating a fluid.

Background Art

[0002] Conventionally, for example, a heating device has been used to heat the liquid stored in a water tank such as a biological treatment tank (Patent Document 1, etc.). Generally, a heater or the like is used as such a heating device.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, conventionally, since a heating device (heater) has been used to heat the liquid, there is a problem that the cost required to heat the liquid is high.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a fluid heating member and a fluid heating method capable of reducing the cost required to heat a fluid.

Means for Solving the Problems

[0006] The fluid heating member according to the present invention includes an internal flow path through which a fluid can flow, and the internal flow path has an upstream end portion into which the fluid flows, a narrow portion provided in a part of the flow path direction and having a reduced flow path cross-sectional area, and an upstream inclined portion that inclines from the narrow portion toward the upstream end portion side and outward in the flow path cross-sectional direction.

[0007] In the fluid heating member according to the present invention, the internal flow path may further have a downstream end portion from which the fluid flows out, and a downstream inclined portion that is inclined from the narrow portion toward the downstream end portion side and outward in the flow path cross-sectional direction.

[0008] The fluid heating method according to the present invention uses a heating member having an upstream end portion into which the fluid flows, a narrow portion provided in a part of the flow path direction and having a reduced flow path cross-sectional area, and an upstream inclined portion that is inclined from the narrow portion toward the upstream end portion side and outward in the flow path cross-sectional direction, and having an internal flow path capable of flowing the fluid, to heat the fluid.

[0009] The fluid heating method according to the present invention may arrange the heating member inside a tank capable of accommodating the fluid or in a flow path connected to the tank, and circulate the fluid to heat the fluid supplied to the tank.

[0010] In the fluid heating method according to the present invention, the fluid may be a liquid, and the tank may be a biological treatment tank.

Effect of the Invention

[0011] According to the fluid heating member and the fluid heating method of the present invention, it is possible to reduce the cost required to heat the fluid.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Mode for Carrying Out the Invention

[0013] Hereinafter, preferred embodiments for implementing the present invention will be described with reference to the drawings. Note that the following embodiments do not limit the invention according to each claim, and not all combinations of features described in the embodiments are essential for the solution means of the invention. Also, in this embodiment, the scales and dimensions of each component may be exaggerated, or some components may be omitted.

[0014] [Overall Configuration of Heating System] The heating system 1 according to this embodiment is a heating system for heating a fluid. Specifically, as shown in FIGS. 1 and 2, the heating system 1 includes a tank 10 capable of accommodating a fluid, a flow path 20 connected to the tank 10, a pump 30 and a fluid heating member 40 (hereinafter simply referred to as "heating member 40") disposed in the flow path 20, and a control device (not shown) capable of controlling the temperature of the fluid accommodated in the tank 10. Hereinafter, in this embodiment, the fluid will be described as being a liquid, but it is not limited thereto, and the fluid may be a gas.

[0015] [Configuration of Tank] As shown in FIGS. 1 and 2, the tank 10 has a housing portion 11 capable of accommodating a liquid and a plurality of support portions 12 capable of supporting the housing portion 11. The housing portion 11 is formed in a cylindrical shape having an internal space capable of accommodating a liquid, and specifically, is formed in a bottomed cylindrical shape with an open upper end. Further, the housing portion 11 has a liquid inlet 11a, an inflow side connection portion 11b extending from the edge of the inlet 11a toward the outside of the housing portion 11, a liquid outlet 11c, and an outflow side connection portion 11d extending from the edge of the outlet 11c toward the outside of the housing portion 11. The inlet 11a, the inflow side connection portion 11b, the outlet 11c, and the outflow side connection portion 11d are provided in the vicinity of the lower end portion of the housing portion 11, respectively.

[0016] Note that the configuration of the tank 10 is not limited to this, and various known configurations may be adopted. For example, a configuration without the support portion 12 may be used, or a configuration in which the upper end of the housing portion 11 is not open may be used.

[0017] The tank 10 having the above configuration is preferably a water treatment tank used for treating water to be treated such as wastewater discharged from a household. Examples of the water treatment tank include a biological treatment tank used for treating water to be treated using microorganisms, an ozone treatment tank used for treating water to be treated using ozone gas, and the like.

[0018] [Configuration of the flow path] As shown in FIGS. 1 and 2, one end portion in the flow path direction of the flow path 20 is connected to the inlet 11a of the accommodating portion 11, and the other end portion in the flow path direction is connected to the outlet 11c of the accommodating portion 11. Specifically, one end portion in the flow path direction of the flow path 20 is connected to the inflow side connection portion 11b of the accommodating portion 11 via the temperature raising member 40, and the other end portion in the flow path direction is connected to the outflow side connection portion 11d of the accommodating portion 11. That is, the flow path 20 according to the present embodiment constitutes a circulation flow path capable of circulating the liquid flowing out from the outlet 11c of the accommodating portion 11 into the inlet 11a of the accommodating portion 11 together with the temperature raising member 40.

[0019] [Configuration of the pump] As shown in FIGS. 1 and 2, the pump 30 is disposed upstream (on the outlet 11c side) of the temperature raising member 40 in the flow path 20. Further, the pump 30 is configured to be able to discharge the liquid existing in the accommodating portion 11 and the flow path 20 by urging the liquid, and to circulate the liquid flowing out from the outlet 11c of the accommodating portion 11 into the inlet 11a of the accommodating portion 11. Since various known pumps can be adopted as the pump 30, detailed description thereof is omitted.

[0020] [Configuration of the temperature raising member] As shown in FIGS. 1 and 2, the temperature-raising member 40 is disposed on the downstream side (the inlet 11a side) of the pump 30 in the flow path 20. Specifically, the temperature-raising member 40 is disposed between one end portion in the flow path direction of the flow path 20 and the inflow-side connection portion 11b of the housing portion 11. Note that the temperature-raising member 40 may be disposed at any position on the downstream side (the inlet 11a side) of the pump 30 in the flow path 20, or may be disposed on the upstream side (the outlet 11c side) of the pump 30 in the flow path 20.

[0021] As shown in FIG. 3, the temperature-raising member 40 has a cylindrical main body 41 with both axial ends open, and an internal flow path 42 formed inside the main body 41 and capable of flowing a liquid. That is, in the present embodiment, the internal space of the main body 41 functions as the internal flow path 42.

[0022] The internal flow path 42 is provided in a part of the flow path direction, and has a narrow portion 42a where the flow path cross-sectional area is reduced, an upstream end portion 42b into which the liquid flows, a downstream end portion 42c from which the liquid flows out, an upstream inclined portion 42d that inclines from the narrow portion 42a toward the upstream end portion 42b side and outward in the flow path cross-sectional direction (a direction orthogonal to the flow path direction), and a downstream inclined portion 42e that inclines from the narrow portion 42a toward the downstream end portion 42c side and outward in the flow path cross-sectional direction. Note that in this specification, the "narrow portion" is a portion where the flow path cross-sectional area of the internal flow path 42 is the smallest.

[0023] In other words, the internal flow path 42 according to the present embodiment is configured such that the flow path cross-sectional area decreases from the end portion on the upstream end portion 42b side of the upstream inclined portion 42d toward the narrow portion 42a, and the flow path cross-sectional area increases from the narrow portion 42a toward the end portion on the downstream end portion 42c side of the downstream inclined portion 42e.

[0024] As shown in FIG. 3, the narrow portion 42a is provided inside the flow path direction. Further, the narrow portion 42a has a flow path cross-sectional area smaller than the flow path cross-sectional areas of the upstream end portion 42b and / or the downstream end portion 42c.

[0025] Here, from the viewpoint of increasing the flow velocity of the liquid flowing through the internal flow path 42 to raise the temperature, the flow path cross-sectional area of the narrow part 42a is preferably 15% or more and 85% or less, more preferably 20% or more and 80% or less, and still more preferably 25% or more and 75% or less with respect to the flow path cross-sectional area of the upstream end portion 42b of the internal flow path 42.

[0026] The upstream inclined portion 42d and the downstream inclined portion 42e are conical surfaces that form the internal flow path 42. In other words, the upstream inclined portion 42d and the downstream inclined portion 42e are the inner peripheral surfaces of the main body 41. In the present embodiment, the upstream inclined portion 42d is formed in a planar shape without a step from the end portion on the upstream end portion 42b side toward the end portion on the narrow portion 42a side. Similarly, the downstream inclined portion 42e is formed in a planar shape without a step from the end portion on the narrow portion 42a side toward the end portion on the downstream end portion 42c side. That is, both the upstream inclined portion 42d and the downstream inclined portion 42e are smooth surfaces. By adopting such a shape, it is possible to suppress the generation of turbulent flow of the liquid flowing out from the downstream end portion 42c.

[0027] From the viewpoint of suppressing the generation of turbulent flow of the liquid flowing out from the downstream end portion 42c and increasing the space utilization efficiency of the internal flow path 42, as shown in FIG. 3, the linear distance D1 along the flow path direction from the end portion on the upstream end portion 42b side of the upstream inclined portion 42d to the narrow portion 42a is preferably longer than the linear distance D2 along the flow path direction from the narrow portion 42a to the end portion on the downstream end portion 42c side of the downstream inclined portion 42e, and more preferably 2 to 3 times longer.

[0028] The temperature raising member 40 having the above configuration is configured to increase the flow velocity of the liquid by the narrow portion 42a to raise the temperature. Further, the temperature raising member 40 is configured to be able to appropriately change the temperature raising efficiency of the liquid by adjusting the flow path cross-sectional area of the narrow portion 42a. For example, when the flow path cross-sectional area of the narrow portion 42a is reduced, the flow velocity of the liquid increases, so the temperature raising efficiency also increases. On the other hand, when the flow path cross-sectional area of the narrow portion 42a is increased, the flow velocity of the liquid decreases, so the temperature raising efficiency also decreases.

[0029] [Configuration of Control Device] The control device is configured to be able to control the temperature of the liquid accommodated in the accommodation part 11. Specifically, the control device has a measurement part capable of measuring the temperature of the liquid accommodated in the accommodation part 11, and a control part capable of controlling the temperature of the liquid so that the temperature of the liquid accommodated in the accommodation part 11 becomes a predetermined temperature.

[0030] The control part is configured to be able to control the temperature of the liquid so that the temperature of the liquid accommodated in the accommodation part 11 becomes a predetermined temperature by changing the flow conditions of the liquid passing through the temperature raising member 40 according to the temperature of the liquid measured by the measurement part. Examples of the flow conditions of the liquid include the number of times the liquid passes through the temperature raising member 40 (that is, the number of circulation times of the liquid), the flow rate of the liquid, and the flow time of the liquid (that is, the circulation time of the liquid). The predetermined temperature is appropriately set by the user using the temperature raising system 1. For example, when the tank 10 is a biological treatment tank, from the viewpoint of making the temperature of the liquid accommodated in the accommodation part 11 a temperature suitable for biological treatment, it is preferably 20°C or higher and 40°C or lower, and more preferably controlled to be around 25°C to 37°C.

[0031] [Method for raising the temperature of the fluid] Next, a method for raising the temperature of the fluid using the temperature raising system 1 according to the present embodiment will be described. When the pump 30 is driven with the liquid accommodated in the accommodation part 11 of the tank 10, the liquid accommodated in the accommodation part 11 flows out from the outlet 11c, flows through the flow path 20, and flows into the accommodation part 11 from the inlet 11a and circulates.

[0032] In this circulation process, the liquid urged by the pump 30 is repeatedly introduced into the narrow part 42a of the temperature raising member 40, passed through the narrow part 42a, and the flow rate is increased, whereby the temperature of the liquid can be raised. Then, the temperature of the liquid is controlled by the control device so that the temperature of the liquid accommodated in the accommodation part 11 becomes a predetermined temperature.

[0033] [Advantages of the fluid temperature raising member and the fluid temperature raising method according to the present embodiment] Thus, the temperature-raising member 40 according to the present embodiment includes an internal flow path 42 through which a fluid can flow. The internal flow path 42 has an upstream end portion 42b into which the fluid flows, a narrow portion 42a provided in a part of the flow path direction and having a reduced flow path cross-sectional area, and an upstream inclined portion 42d that inclines from the narrow portion 42a toward the upstream end portion 42b side and outward in the flow path cross-sectional direction. Further, the method for raising the temperature of the fluid according to the present embodiment includes an upstream end portion 42b into which the fluid flows, a narrow portion 42a provided in a part of the flow path direction and having a reduced flow path cross-sectional area, and an upstream inclined portion 42d that inclines from the narrow portion 42a toward the upstream end portion 42b side and outward in the flow path cross-sectional direction, and uses a temperature-raising member 40 having an internal flow path 42 through which the fluid can flow to raise the temperature of the fluid.

[0034] According to the temperature-raising member 40 having such a configuration and the method for raising the temperature of the fluid including such a process, the fluid can be heated only by passing the fluid through the narrow portion 42a, and there is no need to separately use a heating device such as a heater. Therefore, there is an advantage that the cost required to heat the fluid can be reduced. Further, since the temperature-raising member 40 has the upstream inclined portion 42d, by appropriately setting the optimal length so as to increase the flow velocity of the fluid while suppressing the piping resistance and suppressing the temperature drop of the heated fluid, there is also an advantage that the temperature-raising efficiency can be increased. The temperature-raising member 40 and the method for raising the temperature of the fluid according to the present embodiment are particularly useful when the fluid is an incompressible fluid such as water that is susceptible to piping resistance.

[0035] Further, in the temperature-raising member 40 according to the present embodiment, the internal flow path 42 further has a downstream end portion 42c from which the fluid flows out and a downstream inclined portion 42e that inclines from the narrow portion 42a toward the downstream end portion 42c side and outward in the flow path cross-sectional direction. According to the temperature-raising member 40 having such a configuration, since the temperature-raising member 40 has the downstream inclined portion 42e, there is an advantage that the generation of turbulent flow of the fluid flowing out from the downstream end portion 42c can be suppressed. Further, since the piping resistance of the fluid can be suppressed and the temperature drop of the heated fluid can be suppressed, there is also an advantage that the temperature-raising efficiency can be increased.

[0036] Furthermore, in the method for heating a fluid according to this embodiment, a heating member 40 is disposed in a flow path 20 connected to a tank 10 capable of containing the fluid, and the fluid is circulated to heat the fluid supplied to the tank 10. According to the heating method including such steps, since the fluid circulates and repeatedly passes through the narrow portion 42a, the fluid can be heated to a desired temperature. Furthermore, by stopping the circulation of the fluid when it reaches the desired temperature, there is an advantage that further temperature increase can be suppressed.

[0037] Also, in the method for heating a fluid according to this embodiment, the fluid is a liquid and the tank 10 is a biological treatment tank. According to the heating method including such steps, by heating the fluid, there is an advantage that the temperature of the fluid contained in the tank 10 can be controlled to a temperature suitable for biological treatment.

[0038] [Modification Example] The fluid heating member and the fluid heating method according to the present invention are not limited to the above-described embodiment, and various modifications can be made without departing from the technical idea of the present invention.

[0039] For example, in the above-described embodiment, the pump 30 and the heating member 40 are described as being disposed in the flow path 20, but the present invention is not limited thereto. The pump 30 and the heating member 40 may be disposed inside the tank 10 without providing the flow path 20, and the liquid may be circulated inside the tank 10. According to the heating method including such steps, since the liquid circulates and repeatedly passes through the narrow portion 42a, there is an advantage that the liquid can be heated to a desired temperature. Further, since the flow path 20 is unnecessary, there is also an advantage that the cost can be reduced.

[0040] Also, in the above-described embodiment, the pump 30 is described as being used to cause the liquid to flow into the narrow portion 42a of the heating member 40, but the present invention is not limited thereto. For example, various known configurations such as a configuration in which a height difference is provided in the flow path 20 may be adopted.

[0041] Furthermore, in the above-described embodiment, it has been described that the liquid is heated by passing the liquid through the narrow portion 42a of the heating member 40. In addition to this, at least a part of the surface of the tank 10 (accommodating portion 11) and the heating member 40 may be covered with a heat insulating material to enhance the heating effect.

[0042] Also, in the above-described embodiment, the heating member 40 has been described as having only the main body 41 and the internal flow path 42, but it is not limited thereto. For example, like the heating member 40' shown in FIG. 4, it may have a gas inflow path 43 for allowing a gas such as air to flow into the internal flow path 42. By having the gas inflow path 43, there is an advantage that the heating effect can be enhanced.

[0043] Furthermore, in the above-described embodiment, the heating member 40 is formed as a separate body from the flow path 20 and has been described as being disposed in the flow path 20, but it is not limited thereto. For example, in this specification, even when the heating member 40 and the flow path 20 are integrally formed or integrally molded, it is referred to as the heating member 40.

[0044] Also, the heating member 40 may have a plurality of narrow portions 42a. Furthermore, the narrow portion 42a may be formed to be long along the flow path direction of the internal flow path 42. In addition, the narrow portion 42a may be configured to be able to vary the flow path cross-sectional area according to the temperature of the liquid to be heated.

[0045] It is clear from the description of the claims that such modifications as described above are included in the scope of the present invention.

Explanation of Reference Numerals

[0046] 1: Heating system 10: Tank 11: Accommodating portion 11a: Inlet 11b: Inlet side connection portion 11c: Outlet 11d: Outlet side connection portion 12: Support portion 20: Flow path 30: Pump 40, 40': Heating member 41: Body 42: Internal flow path 42a: Narrow part 42b: Upstream end 42c: Downstream end 42d: Upstream inclined part 42e: Downstream inclined part 43: Gas inlet path

Claims

1. Comprising an internal flow path capable of flowing a fluid, The internal flow path is, An upstream end where the fluid flows in, A constricted portion provided in a part of the flow path direction and having a reduced flow path cross-sectional area, An upstream inclined portion inclined from the constricted portion toward the upstream end side and outward in the flow path cross-sectional direction And having A fluid heating member.

2. The internal flow path is, A downstream end where the fluid flows out, A downstream inclined portion inclined from the constricted portion toward the downstream end side and outward in the flow path cross-sectional direction And further having The fluid heating member according to Claim 1.

3. Using a heating member comprising an upstream end where the fluid flows in, a constricted portion provided in a part of the flow path direction and having a reduced flow path cross-sectional area, and an upstream inclined portion inclined from the constricted portion toward the upstream end side and outward in the flow path cross-sectional direction, and having an internal flow path capable of flowing a fluid, to heat the fluid A method for heating a fluid.

4. Placing the heating member inside a tank capable of containing the fluid or in a flow path connected to the tank, and circulating the fluid to heat the fluid supplied to the tank The method for heating a fluid according to Claim 3.

5. The fluid is a liquid, The tank is a biological treatment tank The method for heating a fluid according to Claim 4.

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