JP2007192467A - Heat exchanger and warm air generating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger suitable for heating fluid, in particular, air to a constant temperature with high heat exchanging efficiency, and supplying the same. <P>SOLUTION: In this heat exchanger provided with a plurality of fins 14 having an approximately circular arc-shaped cross-section, and formed on an inner wall of a cylindrical base 13 at intervals in the circumferential direction in a state of extending along the direction of a center shaft, and an electric heater 12 on its outer wall, the air is circulated from one end side to the other end side of the cylindrical base 13, thus the air passing through between the adjacent fins 14 is heated and output. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat exchanger, and more particularly to a heat exchanger suitable for generating hot air and a hot air generator using the heat exchanger.

  The inventors of the present invention have proposed a heating device suitable for heating a chemical solution such as an infusion in a hospital. In simple terms, this heating device covers a tube through which a chemical solution is passed with a heat insulation cover, and warms the chemical solution in the tube by passing warm air through the heat insulation cover.

  Here, since the chemical solution is injected into the human body through the injection needle, it is desirable to keep the heating temperature of the chemical solution constant.

  Therefore, an object of the present invention is to provide a heat exchanger suitable for heating and supplying a fluid, particularly air, at a constant temperature with good heat exchange efficiency.

  According to the present invention, a plurality of fins having a substantially arc-shaped cross section are formed on the inner wall of the cylindrical base so as to extend in the circumferential direction at intervals in the circumferential direction, and a heater is disposed on the outer wall. The heat exchanger is characterized in that the fluid passing between adjacent fins is heated by circulating the fluid from one end side to the other end side of the cylindrical base. A heat exchanger is provided.

  In the present heat exchanger, the cylindrical base is preferably cylindrical. In this case, the plurality of fins have their tips extending from the central axis of the cylindrical base to a predetermined distance to form a substantially circular space with no fins along the central axis, and the plurality of fins. It is preferable that the space between the adjacent fins decreases as the distance from the tip approaches, and the space having a substantially circular cross section is closed with a plug member.

  In addition, the heater is formed in a sheet shape, and the plug member has a substantially conical shape portion with its tip directed outward at both ends thereof, and a plurality of fins formed on the cylindrical base and its inner wall side and the outer wall side The sheet-like heater provided in the container is accommodated in a cylindrical main body case via a heat insulating sheet, and both ends of the main body case are closed with side caps having a fluid inlet / outlet at the center, By forming a funnel-shaped recess that extends toward the end of the base, the plurality of fins are formed in the side cap from the doorway by the funnel-shaped recess and the substantially conical shape of the plug member. It is desirable to form an annular fluid passage having a substantially V-shaped cross-section reaching the annular space accommodated.

  According to the present invention, there is also provided a hot air generator characterized in that any one of the heat exchangers described above, wherein the heat exchanger using air as the fluid is provided as a hot air generator.

  The heat exchanger according to the present invention can achieve high heat exchange efficiency, thereby reducing power energy loss and realizing stable temperature management. In addition, the hot air generator according to the present invention does not cause an AC failure and is particularly suitable for use in a hospital.

  A preferred embodiment of the heat exchanger according to the present invention will be described with reference to FIGS.

  FIG. 1 shows the appearance of the heat exchanger according to this embodiment. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along line BB in FIG.

  The external appearance of the heat exchanger 1 has a cylindrical shape, and includes a main body case 10, side caps 20 provided at both ends thereof, and tube connection ports 30 provided in the side caps 20.

  With reference to FIG. 2, FIG. 3, the internal structure of the heat exchanger 1 is demonstrated. A sheet-like electric heater 12 is provided on the inner wall of the cylindrical main body case 10 via a heat insulating sheet 11. Inside the heater 12, a member comprising a cylindrical base 13 and a plurality of fins 14 formed on the inner wall thereof is provided as a heat exchange member. The plurality of fins 14 have a substantially arc shape in cross section, and are formed on the base 13 so as to be spaced in the circumferential direction of the base 13 and extend along the central axis direction of the base 13. The plurality of fins 14 also have their tips extending from the central axis of the base 13 to a predetermined distance, thereby forming a substantially circular space with no fins 14 along the central axis. The plurality of fins 14 are further configured such that the distance between adjacent fins gradually decreases as they approach their tips.

  A space having a substantially circular cross section formed along the central axis of the base 13 is closed by a wind stop 15. The windstop 15 has a substantially conical portion at each end thereof, and the substantially conical portion protrudes from a space having a substantially circular cross section with its tip end facing outward.

  Side caps 20 are attached to both ends of the main body case 10, respectively. The side cap 20 has an inlet / outlet 20-1 for taking in and out a fluid, here air, in the center thereof, and a funnel-shaped recess 20-2 extending from the inlet / outlet 20-1 toward the end of the base 13. . Thereby, in the side cap 20, the cross section which extends from the entrance / exit 20-1 to the annular space in which the plurality of fins 14 are accommodated by the funnel-shaped recess 20-2 and the substantially conical shape portion of the wind plug 15 A substantially V-shaped annular fluid passage 20-3 is formed. A tube connection port 30 protruding outward is attached to the entrance / exit 20-1.

  An O-ring 21 for preventing leakage of air from the annular fluid passage 20-3 is attached to the joint surface between the main body case 10 and the side cap 20.

  FIG. 4 is a cross-sectional view showing the lead wire lead-out structure of the electric heater 12 and the temperature sensor 40 provided in the heat exchanger 1. The main body case 10 and the heat insulating sheet 11 are provided with lead wire lead-out openings 10-1 for exposing a part of the heater 12, and the main body case 10, the heat insulating sheet 11, and the base 13 in other places have fins. A sensor mounting opening 10-2 for exposing a part of the base side of 14 is provided.

  After the assembly of the heat exchanger 1 is completed, the heater lead wire 17 connected to the heater 12 in the lead wire lead-out opening 10-1 is fixed with a heat insulating adhesive, and the entire lead wire lead-out opening 10-1 is sealed. On the other hand, a thermistor, a thermocouple, or the like is used for the temperature sensor 40. After fixing the sensor lead wire 41 with a heat conductive adhesive on the outer periphery of the fin 14, the entire sensor mounting opening 10-2 is sealed with a heat insulating adhesive. .

  By the way, the heat exchange member by the base 13 and the fin 14 can use what was made integrally. As such a heat exchange member, for example, a member in which fins are integrally formed on a plate member by a manufacturing method called a microsolid method by Nakamura Seisakusho can be used.

  Referring to FIG. 5, this heat exchange member is obtained by continuously forming a plurality of fins 51 in a circular arc shape by a microsolid method using a single metal plate as a base (bottom base) 50. With the integrated molding, the heat exchange surface area has been dramatically expanded.

  When this heat exchange member is used as a radiator, for example, it is excellent in mechanical strength, heat dissipation, and thermal conductivity compared to various conventional radiators and can be manufactured from a fin-fin pitch of 0.1 mm. The height of the fin 51 and the thickness of the base 50 can also be specified and manufactured.

  This heat exchanging member is used as a heat dissipating member for releasing heat generated by a semiconductor device or an electronic device. In the present invention, heat is utilized by paying attention to the excellent heat exchanging characteristics of the heat exchanging member. It is intended to be used as a heat exchanger.

  6 (a) is an enlarged view of the fin 51 of FIG. 5 as viewed from the front, and FIG. 6 (b) is a perspective view thereof. The base 50 and the fin 51 are integrally formed, and the heat radiation surface area is greatly increased. Excellent mechanical strength, heat dissipation, and thermal conductivity.

  FIG. 7A is a view in which the heat exchange member of FIG. 5 is molded into a cylindrical shape with the base 50 as the outer periphery in order to be used in the heat exchanger of the present invention. According to such molding, the plurality of fins 51 have a spiral shape, and the distance between the tip end sides (inner peripheral side) becomes dense, and the interval between the root side (outer peripheral side) becomes rough. FIG. 7 (b) is a side view, and the base 50 is provided on the outer periphery by opening the end of the cylindrical shape without sticking, and exerting a spring action to spread over the entire heat exchange member. It is trying to be in close contact with the heater.

  As described above, when air is circulated from one end to the other end by rounding it into a cylindrical shape with the tip end of the fine fin by the microsolid method inside, the high temperature part (root side) of the fin The fin interval is wide and the inflow amount of air is large, and the low-temperature portion at the tip of the fin has a narrow fin interval and the inflow amount of air is reduced, so that warm air with a stable temperature can be obtained. As a result, by using such a heat exchange member, there is little loss of electrical energy and stable temperature management of hot air can be performed.

  Of course, the heat exchange member is not limited to the micro-solid method as described with reference to FIG. 5, but may be one in which an arc-shaped metal fin is fixed and integrated on a metal base.

  Below, the characteristic of each member shown by FIGS. 1-4 is demonstrated.

  1 is made of Teflon (registered trademark) or Delrin (registered trademark) and is not affected by ambient temperature without releasing heat. It is not limited to these materials.

  In FIG. 2, the body case 10 is closed from both ends with the side cap 20 with the tube connection port 30 and the O-ring 21 so that the heat exchanging member does not move in the body case 10 in the left-right direction in the drawing. It also has the role of.

  In the main body case 10, a sheet-like heater (which may be a film heater) 12 made of silicone rubber wrapped in a heat insulating sheet 11 so as to prevent heat from escaping, and a heat exchange member made up of a base 13 and fins 14 are accommodated. Yes.

  In order to block air that does not pass through the fins 14 at the center of the main body case 10, there is a rod-shaped windstop 15 having a conical tip, and this windstop 15 is air that has entered from the tube connection port 30. The flow of air is rectified and the air is evenly guided to the plurality of fins 14 in the state of being accommodated in the annular space.

  In FIG. 3, the material of the body case 10 is made of Teflon (registered trademark) or Delrin (registered trademark), which is excellent in heat insulation, electrical insulation, and heat resistance, as described above. A heat insulating sheet 11 for avoiding escape is stretched, and a heater 12 made of silicone rubber is attached to the inside thereof.

  The heat of the heater 12 heats the base 13 and is transmitted to the fins 14.

  A thermally conductive silicone grease (or a thermally conductive adhesive) is applied between the heater 12 and the base 13, and the adhesion between the heater 12 and the base 13 is enhanced by the spring force of the heat exchange member.

  The shape of the heat exchanger according to the present invention is characterized in that the distance between the fins 14 close to the base 13 is wide and the distance between the fin tips is narrow. That is, the temperature of the fin 14 near the heater 12 is high, and the temperature of the fin tip portion far from the heater 12 is low. On the other hand, the fin base side (high temperature part) with a wide fin interval has a large inflow of air, and the tip with a narrow fin interval (low temperature part) has a high heat exchange efficiency due to an increase in air resistance, thereby reducing energy loss. Uniform heat exchange takes place.

  A hollow area at the center of the main body case 10 is a space unnecessary for heat exchange. In order to prevent the inflow of air, a rod-shaped wind stopper 15 is press-fitted and closed, and all the input air passes between the fins 14. I am doing so. In addition, when the wind plug 15 is press-fitted, the heat exchange member exhibits a spring property, and the adhesion between the heater 12 and the base 13 becomes stronger.

  Next, the operation when the heat exchanger according to the present embodiment is applied to a heat exchanger for a hot air generator, that is, a heating device for heating the above-described chemical solution will be described.

  FIG. 8 shows a schematic configuration of the heating device. This warming device includes a warm air generating device 100 including the heat exchanger 1 according to the above-described embodiment, and a warming unit 200 that warms the chemical solution with the warm air from the warm air generating device 100. 300 connected.

  The power is supplied via the isolation transformer 101 and is separated from the commercial power supply. A noise filter 102 is attached in front of the isolation transformer 101 so that noise is not input and output is not generated. The power switch is also used as a breaker and is immediately turned off when an abnormality occurs. The isolated power supply is supplied to the electric air pump 103 and the control power supply unit 104.

  The electric air pump 103 converts the rotational motion of the motor into a linear motion and drives a teflon (registered trademark) bellows pump to obtain compressed air. The bellows pump can obtain an appropriate flow rate, pressure, and low noise by low-speed movement, and an air filter 105 is provided at the air intake port so as to simply filter the taken-in air.

  The compressed air from the electric air pump 103 is introduced into the heat exchanger 1.

  The heat exchanger 1 radiates the heat generated from the electric heater 12 through the fins 14 and warms the introduced compressed air to convert it into warm air. The hot air temperature is detected by the thermistor 40 and sent to the temperature control unit 107. The temperature control unit 107 compares the detected hot air temperature with the set temperature, and executes a control operation for maintaining the hot air temperature at the set temperature by controlling the electric heater 12 on and off according to the comparison result. . When any abnormality occurs and the hot air temperature rises above the set temperature, this is detected by the overheat prevention element 106. The overheat prevention element 106 immediately turns off the electric heater 12 when it detects a temperature rise.

  The temperature-controlled warm air is supplied to the heat retaining cover 210 of the heating unit 200 through the warm air tube 300 and the connector 230. The heat insulating cover 210 is a cylindrical body whose both ends are open, and the warm air introduced into the heat insulating cover 210 is discharged from both ends. A chemical solution tube 220 is inserted into the heat insulating cover 210. A drug bag is connected to one end side of the drug solution tube 220 via a connector 220-1, and an injection needle is connected to the other end side via a connector 220-2. The chemical solution passing through the chemical solution tube 220 is heated to a constant temperature by warm air introduced into the heat insulating cover 210.

  The temperature control unit 107 can arbitrarily set the temperature of the hot air (for example, 35 to 37 degrees close to the body temperature), and the temperature detection signal detected by the thermistor 40 turns the electric heater 12 on and off to maintain the optimum temperature. It has become. When the overheat prevention element 106 is activated, the electric heater 12 is locked off. In addition, it is designed so that the heater power supply is automatically shut off when some abnormality occurs and it becomes in an uncontrollable state. Such a warm air generator 100 is particularly suitable for use in a hospital because it does not cause an AC fault.

  Referring also to FIG. 2, a blower tube (not shown) from the air pump 103 is connected to the left tube connection port 30. On the other hand, the hot air introduction tube 300 is connected to the tube connection port 30 on the right side, and the hot air introduction tube 300 is connected to the heat insulation cover 210.

  The low-pressure air that has entered from the tube connection port 30 on the left side is evenly rectified and distributed to the plurality of fins 14 at the substantially conical shape portion at the tip of the windstop 15, and all the air (indicated by dotted arrows) ) Through the right tube connection port 30.

  The base 13 in contact with the heater 12 in FIG. 3 is heated and heat is transferred to the fins 14. The fin 14 near the base 13 becomes high temperature and becomes low at the tip end of the fin 14, but the fin interval at the high temperature part is wide, the air flow is large and the heat exchange amount is large, and the fin interval is large at the tip end of the fin 14. Narrowly increases the air resistance and decreases the air flow rate. That is, this heat exchanger having a high air flow rate in the high temperature part and a low air flow rate in the low temperature part has a function of keeping the air temperature constant.

  A thermistor or a thermocouple is used as the temperature sensor 40 for temperature control, and after being fixed to the base 13 with a heat conductive adhesive, it is covered with a silicone heat insulating sealing material so as not to be affected by the outside. The thermocouple can also be molded inside the silicone rubber heater.

  With the configuration as described above, the chemical solution passing through the chemical solution tube 220 can be heated to a constant temperature with warm air introduced into the heat retaining cover 210. In particular, this hot air generator has a high heat exchange efficiency in the heat exchanger 1, in other words, a power loss in the heater 12 is small, and no AC failure occurs.

  The heat exchanger according to the present invention is not only a heating device for warming an infusion tube for supplying an infusion solution, blood, contrast medium, etc. for infusion, blood transfusion, diagnosis, etc., but also a cell in basic medical research. Although it is suitable as a warm air supply source of a heating device that performs environmental temperature setting such as warm air, the present invention is not limited thereto, and is applicable as a heat exchanger for general fluids.

FIG. 1 shows the appearance of a heat exchanger according to an embodiment of the present invention. 2 is a cross-sectional view taken along line AA in FIG. 3 is a cross-sectional view taken along line BB in FIG. FIG. 4 is a cross-sectional view showing a lead wire drawing structure of an electric heater and a temperature sensor provided in the heat exchanger of the present invention. FIG. 5 is a view for explaining fins by the microsolid method used in the heat exchanger according to the present invention. FIG. 6 is an enlarged cross-sectional view (FIG. A) and a perspective view (FIG. B) showing a part of the fin shown in FIG. FIG. 7 is a view for explaining a form in which the fin shown in FIG. 5 is formed into a cylindrical shape and used in the heat exchanger according to the present invention. FIG. 8 shows a schematic configuration when the heat exchanger according to the embodiment of the present invention is applied to a heat exchanger for a hot air generator, particularly a heating device for heating a chemical solution.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat exchanger 10 Main body case 11 Heat insulation sheet 12 Electric heater 13 Base 14 Fin 15 Wind stop 20 Side cap 30 Tube connection port

Claims (4)

  A heat exchanger in which a plurality of fins having a substantially arc-shaped cross section are formed on the inner wall of the cylindrical base so as to extend in the circumferential direction at intervals in the circumferential direction, and a heater is provided on the outer wall The heat exchanger is characterized in that the fluid passing between adjacent fins is heated by circulating the fluid from one end side to the other end side of the cylindrical base.   2. The heat exchanger according to claim 1, wherein the cylindrical base is cylindrical, and the plurality of fins are centered by their tips extending from a central axis of the cylindrical base to a predetermined distance. A space having a substantially circular cross section without fins is formed along the axis, and the plurality of fins are arranged such that a distance between adjacent fins decreases as they approach the tip. A heat exchanger characterized by peeling.   3. The heat exchanger according to claim 2, wherein the heater has a sheet shape, and the plug member has a substantially conical shape portion with a tip facing outward at both ends thereof, on the cylindrical base and the inner wall side thereof. A plurality of formed fins and a sheet-like heater provided on the outer wall side are accommodated in a cylindrical main body case via a heat insulating sheet, and both ends of the main body case are closed with side caps having fluid inlets and outlets in the center. The funnel-shaped recess that extends from the doorway toward the end of the base is formed in the side cap, so that the funnel-shaped recess and the abbreviation of the plug member are formed in the side cap. An annular fluid passage having a substantially V-shaped cross section is formed by the conical portion from the entrance / exit to an annular space in which the plurality of fins are accommodated. The hot air generator according to any one of claims 1 to 3, comprising a heat exchanger that uses air as the fluid as a hot air generating source.

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