JP3254331B2 - Gas mixers and flow heating devices - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a gas mixer for injecting a mixed gas at a high pressure while mixing an atmospheric gas with a compressed gas, and uses the gas mixer as a means for stirring and mixing an atmospheric gas as a heating medium. The present invention relates to a flow-type heating device such as a flow-type heat treatment furnace and a thermostat.

[0002]

2. Description of the Related Art As a conventional gas mixer, there is a gas mixer utilizing the Coanda effect as disclosed in, for example, US Pat. No. 2,052,869. In this gas mixer, the compressed high-pressure first gas is radially opposed to the axial direction of the internal flow path, one end of which is communicated to the outside, in which the second gas exists as an atmospheric gas. , The first gas is mixed with the second gas, and the mixed gas whose flow rate has been amplified is discharged from the other end of the internal flow path. As another gas mixer, for example, Japanese Utility Model Publication No. 57-460
As disclosed in Japanese Patent No. 35, there is an apparatus utilizing the ejector pump effect. In this gas mixer, a compressed high-pressure first gas, which is introduced from a nozzle in a direction orthogonal to the axial direction of the internal flow path in a radial direction and is opposed to the axial direction of the internal flow path, is caused to substantially collide with a lip projectingly formed in the internal flow path. After being deflected in the axial direction, the deflected first gas collides with a convergent frustoconical surface formed in front of the flow path and is deflected in a manner to converge in the axial direction on the discharge port side. The first gas is mixed with the second gas in the internal flow path by the deflection of the degree, so that a mixed gas whose flow rate is amplified is obtained from the discharge port.

On the other hand, in a conventional flow-type heat treatment apparatus, for example, in a flow-type heat treatment furnace for sintering an object to be processed while circulating an atmosphere gas as a heating medium in the furnace, a heat-resistant and heat-insulating treatment is performed. A furnace filled with an atmosphere gas such as air or nitrogen is divided into a heat treatment part and a heat source part by a heat shield, and a circulation flow path is provided between the heat treatment part and the heat source part through an outflow passage and an inflow passage. Is formed, an object to be processed is accommodated in the heat treatment section, and a heater serving as heating means is provided in the heat source section.
A stirring and mixing means such as a propeller fan or a siccolo fan for circulating the atmosphere gas heated by the heater is mounted. Note that the division by the heat shield is for preventing radiation heat from the heater from being given to the object to be processed. In this heat treatment furnace, an atmosphere gas as a heating medium is heated to a predetermined temperature by a heater on the heat source side,
The atmosphere gas is circulated between the heat source and the heat treatment section by the air blown by a fan, which is a stirring and mixing means. Is made uniform.

[0004]

In the conventional gas mixer described above, in the former case utilizing the Coanda effect, a turbulent flow or a reverse flow is generated when compressed gas from each nozzle facing in the radial direction collides. Causes a large pressure loss in the compressed gas, and in the latter case using the ejector pump effect, the compressed gas generated by twice the deflection of the flow path by the lip acting as a baffle and the convergent frustoconical surface Pressure loss is large. As described above, when a large pressure loss occurs in the compressed gas at the time of mixing, the atmospheric gas in the internal flow path entrained by the compressed gas cannot be sufficiently mixed with the compressed gas. In the case of the latter gas mixer, a complicated compressed gas flow path including the lip and the convergent frusto-conical surface must be formed on the inner surface of the cylindrical body serving as the internal flow path, and the processing is easy. Instead, as in the embodiment shown in the publication, the work is divided and processed, and a rubber seal packing must be used at the joint. For this reason, there are also problems such as an increase in manufacturing cost and incompatibility with use in a high-temperature atmosphere gas. Furthermore, in the case of the former and latter gas mixers, the structure cannot change the flow rate and flow rate of the mixed gas discharged without changing the flow rate and pressure of the compressed gas to be introduced. Could not respond to.

[0005] As described above, the conventional heating apparatus using a fan as the means for stirring and mixing the atmospheric gas as the heating medium consumes a large amount of power, is uneconomical, and generates noise that impairs the surrounding environment. In addition, the quality of the product deteriorates due to the contamination of the inside of the furnace due to the vibration applied to the workpiece and the fine dust generated from the moving parts of the fan, etc. There were various problems that needed to be solved, such as increasing the size. In addition, in order to solve the above-mentioned problems of the flow-type heating device, the use of a gas mixer as a stirring and mixing means of the atmospheric gas instead of the fan was examined. Was enough. For example,
A gas mixer is mounted in a furnace filled with a high-temperature atmosphere gas, which is a second gas, in a mode in which an inlet for a compressed gas, which is a first gas, is projected outside, and a low-temperature gas is introduced from the above-described inlet. While the compressed air is being replenished sequentially, the mixture is stirred and mixed with a high-temperature atmosphere gas, the first gas is instantaneously converted to a high temperature equal to the second gas, and high-pressure is injected from the discharge port. It is desirable to have a function of constantly maintaining the inside of the body at a desired temperature with a uniform temperature distribution. But,
When a gas mixer having a large pressure loss of the compressed gas is used as the stirring and mixing means as in the conventional structure, the low-temperature compressed air supplied from the inlet is not instantaneously and sufficiently stirred and mixed with the high-temperature atmosphere gas. The temperature inside the furnace cannot be kept constant. Further, if a member that is difficult to obtain heat resistance, such as a rubber packing, is included in the structure, the operating temperature is limited and the device cannot be used in a high-temperature atmosphere. Furthermore, when using a conventional gas mixer that adjusts the flow rate and flow rate of the mixed gas by increasing or decreasing the flow rate of the compressed gas, it is necessary to increase or decrease the amount of the compressed gas introduced to keep the temperature inside the furnace constant. Accordingly, it is necessary to adjust the temperature by varying the amount of electricity supplied to the heater, and it is necessary to provide a pressure regulating valve to release the excess atmospheric gas to the outside in order to keep the pressure inside the furnace constant.

Therefore, the present invention provides a gas mixer for injecting a mixed gas at a high pressure while mixing an atmospheric gas with an introduced compressed gas. A gas mixer capable of easily fine-tuning the flow rate and flow rate of a mixed gas discharged while maintaining a constant introduction flow rate and pressure, and stirring and mixing this gas mixer with an atmospheric gas as a heating medium It is an object of the present invention to provide a flow-type heating device used in a flow-type heat treatment furnace or a thermostat as a means.

[0007]

A first aspect of the present invention is an atmosphere.
Mixer body forming gas flow path and compressed gas introduced
Compressed gas introduction section, and a mixture of the above atmospheric gas and compressed gas.
And a mixed gas injection unit that injects the mixed gas at high pressure.
The mixer main body has an internal flow path along the axial direction.
A formed cylindrical body with an atmospheric gas on the rear side
A suction port is provided to allow the existing external channel to communicate with the internal channel.
In addition, the above mixed gas injection unit is provided with an injection nozzle
And connected coaxially to the front side of the mixer body.
Between the rear end side of the mixed gas injection section and the main body of the mixer.
The diameter is gradually reduced toward the mixed gas injection section by the intermediate section.
While forming an orifice in a tapered ring shape,
An annular introduction groove is formed on the outer peripheral side of the orifice.
The compressed gas introduction part is a guide inclined in the same direction as the orifice.
Open the end of the inlet pipe into the annular introduction groove, and
It is connected integrally with the mixer body, and the mixed gas injection unit is
Adjust the width of the orifice passage so that the connecting cylinder is
This is a gas mixer screwed forward and backward with the front side of the mixer body .

A second aspect of the present invention is that the orifice in the first gas mixer comprises a conical convex portion formed on the mixer body side, the tip side of which is gradually reduced in diameter; It is constituted by a gap between conical concave portions formed in a complementary shape opposite to the conical convex portion,
The gap can be variably set according to the screwed state of the mixed gas injection unit in which the connection cylinder is screwed to the mixer body .
And check the opening state of the orifice from outside.
This is a gas mixer provided with a scale display .

A third aspect of the present invention is that a heating device body filled with an atmospheric gas has a heat source section provided with a heating means for the atmospheric gas, and a heat treatment section containing an object to be heat-treated by the atmospheric gas. The heating means heats the atmospheric gas while replenishing a low-temperature gas from the outside to the heat source portion side, and the heated atmospheric gas is stirred by a stirring and mixing means provided in the heating device body. In a gas-flow heat treatment apparatus for performing heat treatment of the object to be processed by circulating between the heat source part and the heat treatment part,
And a compressed air for introducing a compressed gas.
And Karadashirube join the club, the a mixture of the atmospheric gas and compressed gas
A gas mixer having a mixed gas injection unit for injecting a mixed gas at a high pressure is used as the stirring and mixing means for the atmospheric gas, and the gas mixer is provided with one end of the compressed gas introduction unit into which the low-temperature compressed gas is introduced. This is a flow-type heat treatment apparatus mounted on the heat source unit side in a state of protruding outside the heating apparatus body.

[0010] A fourth aspect of the present invention is that the mixer main body in the third flue gas heat treatment apparatus has an internal portion along an axial direction.
A cylindrical body with a flow path formed, and an atmosphere
Suction port that connects the internal flow path with the outside where gas is present
And the above-mentioned mixed gas injection unit is provided with an injection nozzle at the end of the connecting cylinder.
Form a nozzle and connect it coaxially to the front side of the mixer body.
And the rear end side of the mixed gas injection unit and the mixer body
Of the mixed gas injection section
When an orifice is formed in a tapered ring shape
In addition, an annular introduction groove is formed on the outer peripheral side of the orifice.
The compressed gas introduction part is inclined in the same direction as the orifice.
Open the tip of the inclined introduction pipe into the annular introduction groove.
To the mixer body,
The projecting part can adjust the passage width of the orifice,
A flow-type heat treatment apparatus in which a cylinder is screwed with a front side of the mixer main body so as to advance and retreat .

[0011] The fifth invention, the third or fourth gas mixer in Nagareki type heat treatment device, Rutotomoni towards the injection nozzle of the mixed gas sprayer to the heating means, the mixing
Atmospheric gas returns from the heat treatment section through the suction port of the mixer body
This is a flowing- air heat treatment apparatus which is opened on the inflow side to be provided and arranged adjacent to the heating means.

A sixth aspect of the present invention is the above-described third to fifth air-flow types.
The gas mixer in the heat treatment device injects the mixed gas
The heating device is arranged in the axial direction in which the injection nozzle extends.
Suction of the main body of the mixer that sucks the atmospheric gas in the body
The ports are arranged orthogonally, and this suction port is heated by atmospheric gas.
Of the heat source section in a mode that opens to the inflow side returned from the
This is a flow-type heat treatment apparatus provided at a corner.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 is an external perspective view of a gas mixer 1 according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the gas mixer 1. The gas mixer 1 includes a mixer body 2
And a compressed gas introduction unit 3 and a mixed gas injection unit 4 as main components. The mixer main body 2 is a cylindrical cylinder having an internal flow path 5 formed along the axial direction, and an external and internal flow path in which an atmosphere gas as a second gas is present behind the cylindrical body. A suction port 6 for communicating with the cylindrical member 5 is formed, and a female screw portion 7 is provided on the inner surface on the distal end side of the cylindrical body. An annular introduction groove 8 is formed in the mixer main body 2 by hollowing out an intermediate portion of the cylindrical body with a constant width, and a conical convex surface is formed inside the annular introduction groove 8 so that the tip side gradually decreases in diameter. A part 9 is formed. In the illustrated embodiment, the suction port 6 is provided orthogonal to the axial direction. However, there is a mode in which the suction port is formed in the rear end face along the axial direction.

The compressed gas introduction section 3 extends parallel to the axial direction of the mixer main body 2 and has a feed pipe 11 provided with a male thread 10 at one end, and the other end of the feed pipe 11. Is connected to the mixer main body 2 so as to extend in an inclined manner with respect to the axial direction of the mixer main body 2, and the other end is integrally connected to the mixer main body 2 so as to fit in the annular introduction groove 8. And an introduction pipe 12. The mixed gas injection unit 4 includes a front-end injection nozzle 14 having a discharge port 13 provided therein, and a rear-end connection tube 16 provided with a male screw part 15 screwed to the female screw part 7 on the outer periphery. A conical concave portion 17 having a complementary shape to the conical convex portion 9 is formed inside the rear end of the connecting cylinder 16. In addition,
In the illustrated embodiment, the introduction pipe 12 is connected to the mixer body 2.
Are set so as to intersect with the axis direction at an inclination angle of about 60 degrees. In this embodiment, the introduction pipe 1
The tip of the orifice 2 is opened to a part of the annular introduction groove 8 and communicates with the entire periphery of the orifice 18 on the inlet side to be described later through the annular introduction groove 8. There is also a mode in which it is formed in a donut shape communicating with the entire circumference on the side, and in that case, the annular introduction groove 8 can be omitted.

[0015] The mixed gas injecting unit 4 is mounted a male screw portion 15 to the mixer main body 2 is screwed into the female screw portion 7.
As a result, an orifice 18 having a tapered passage having a gradually decreasing diameter is formed between the conical convex surface 9 of the mixer main body 2 and the conical concave surface 17 of the mixed gas injection unit 4. . The orifice 18 can change the width of the passage by rotating the mixed gas injection unit 4 to change the screwing state. However, the orifice 18 is screwed to the male screw part 15 to prevent loosening after the desired setting. A lock nut 19 is mounted. A scale indicator 20 is provided on the outer peripheral surfaces of the injection nozzle 14 and the lock nut 19 so that the opening state of the orifice 18 can be checked from the outside. In the illustrated embodiment, the inclination angle of the orifice 18 with respect to the axial direction of the mixer main body 2 is set to approximately 15 degrees.

In the gas mixer 1 having the above-described structure, the mixer main body 2 and the mixed gas injection unit 4 are installed in the atmosphere gas as the second gas, and the compressed gas introduction unit 3 is connected to the compressed gas introduction unit 3 via the male screw unit 10. It is used in a state where the compressed gas as the first gas is supplied from a high-pressure air pressure source such as a compressor connected to the compressor. The compressed gas 21 pressure-fed from the supply pipe 11 of the compressed gas introduction section 3 to the inclined introduction pipe 12 is mixed through the orifice 18 having a tapered ring-shaped passage whose opening end opens into the annular introduction groove 8. Internal flow path 5 of main body 2
And collides with the atmosphere gas 22 in a manner converging on the axial center toward the front side of the flow path, and is stirred and mixed so as to push the atmosphere gas 22 forward of the flow path. The mixed gas 23 is injected from the discharge port 13 of the injection nozzle 14 at the flow rate of the compressed gas 21, and the atmosphere gas 22 flows through the intake port 6 behind the internal flow path 5 in a reduced pressure state. Thus, the outside atmosphere gas 22 is sequentially flown in, whereby the atmosphere gas 22 is circulated.

In the gas mixer 1, the compressed gas 21 introduced through the inclined introduction pipe 12 is injected from the tapered orifice 18 so as to converge on the axial center toward the front side of the flow path. , The internal flow path 5 of the mixer body 2
The liquid was made to collide with the atmosphere gas 22 existing in the above and stirred and mixed. As described above, the number of baffle members obstructing the flow path of the compressed gas 21 is small, and the jetting to the center of the atmosphere gas 22 along the flow path reduces pressure loss compared to the conventional structure and provides effective stirring. Mixing can be performed. Further, by rotating the injection nozzle 14, the mixer main body 2 is rotated.
By changing the opening width of the orifice 18 by changing the screwing state of the orifice 18, the flow rate and flow rate of the mixed gas 23 can be adjusted as desired with the flow rate of the compressed gas 21 kept constant. Furthermore, since a member that is difficult to obtain heat resistance, such as rubber packing, is not included in the structure, it can be used even in a high-temperature atmosphere without any limitation on the use temperature. The material of each member constituting the gas mixer 1 is selected from various materials depending on a temperature range to be used. When the operating temperature range is high and is 700 ° C. or less, for example, a material such as stainless steel is used. In a higher temperature range of 700 ° C. or more and 1200 ° C., for example, a high melting point material such as tantalum or inconel, a heat-resistant ceramic or alumina can be used.

Next, the heating apparatus using the gas mixer 1 as stirring and mixing means will now be described with reference to flow air type heat treatment furnace shown in the schematic diagram and the block diagram of FIG. 4 in FIG. Inside the furnace body 24, a heat source unit 26 having a heater 25 mounted thereon as a heating means and a heat treatment unit 2 for processing a workpiece 27 are provided.
8 are arranged in a dispersed manner, and the heat source section 26 and the heat treatment section 2
A heat shield 29 is provided between the heaters 8 so that radiant heat from the heater 25 does not directly act on the workpiece 27.
In addition, between the heat source section 26 and the heat treatment section 28, there is an outflow passage 32 formed between one end of the heat shield 29 and the furnace body 24, and between the other end of the heat shield 29 and the furnace body 24. Are communicated via an inflow passage 33 formed in the second passage. The inside of the furnace body 24 is filled with an atmospheric gas 22 as a heating medium.
The atmosphere gas 22 heated in step 5 is circulated in the furnace body 24 while being stirred and mixed by the gas mixer 1, and at least the heat treatment section 28 is maintained at a desired constant temperature to perform heat treatment on the workpiece 27. The gas mixer 1 directs the injection port of the mixed gas injection section 4 toward the heater 25, sets the suction port 6 for the atmospheric gas 22 to open on the return side of the circulation path, and feeds the compressed gas introduction section 3. With the pipe protruding outside the furnace body 24, the pipe is provided in the heat source section 26 adjacent to the heater 25. Further, a temperature sensor 30 such as a thermocouple for detecting the internal temperature of the furnace body 24 is attached to the heat treatment unit 28, and the temperature sensor 30 and the heater 25 on the side of the heat source unit 26 are connected to the furnace body 2.
4 are connected to temperature controllers 31 provided outside.

The low-temperature compressed gas 11 sent from the compressor to the compressed gas introduction unit 3 is mixed with the ambient gas 22 in the gas mixer 1 to become high temperature. Are sequentially injected toward the heater 25, heated by the heater 25, assimilated with the atmospheric gas 22, and sent out from the heat source unit 26 side to the heat treatment unit 28 side via the outflow passage 32. This atmospheric gas 22
After performing a predetermined heat treatment on the processing target 27 while making a circuit around the heat treatment unit 28 side, the heat is returned from the heat treatment unit 28 side to the heat source unit 26 side via the inflow path 33, and the gas mixer 1 The suction is sequentially performed on the suction port 6. Thereby, the furnace body 24
The atmosphere gas 22 is stirred and mixed while repeating circulation between the heat source unit 26 side and the heat treatment unit 28 side.
The inside of 4 is set to a uniform desired temperature suitable for processing of the processing object 27. Further, a temperature sensor 30 disposed in the middle of the circulation path for the purpose of temperature control transmits necessary information to a temperature controller 31 while constantly checking the temperature inside the furnace body 24, and based on this information, The controller 31 controls the heater 25 to perform heating adjustment. In the above-described embodiment, the gas mixer 1 in which the suction port 6 is disposed orthogonal to the axial direction is provided at a corner of the furnace body 24, and the discharge port 1 of the injection nozzle 14 is provided.
3 to the heater 25 and the suction port 6 to the inflow path 3
It is used in a state where it is opened to the third side, whereby efficient stirring and mixing can be performed along the normal route. However, depending on the form of the furnace and the configuration of the flow path, it may be more effective to use a gas mixer in which the suction port is disposed coaxially at the rear end side in the axial direction.

As described above, in this flowing gas heat treatment furnace, the gas mixer 1 is used as a means for stirring and mixing the atmospheric gas 22, and the low-temperature compressed gas 21 introduced from the outside is mixed with the atmospheric gas 22 to increase the temperature. The mixed gas 23 is sprayed on the heater 25 to further heat the mixture. This prevents the temperature of the heater from being locally reduced or causing a variation in the temperature distribution, unlike the case where a low-temperature gas to be supplementarily introduced into the furnace is directly blown onto the heater to heat the heater. The above-mentioned various problems that occur when the agitating and mixing means are used are also greatly improved. When the temperature in the furnace exceeds 200 ° C., a rubber packing material or the like cannot be used. However, the gas mixer 1 which does not require this can be used in a high temperature atmosphere without being limited to a use temperature. . In addition, when the opening width of the orifice 18 of the gas mixer 1 is changed, the flow rate and the flow rate of the mixed gas 23 can be variably adjusted while keeping the flow rate of the compressed gas 21 constant. In this case, as in the case of the conventional gas mixer that adjusts the flow rate and the flow rate of the mixed gas by increasing and decreasing the flow rate of the compressed gas, the heater is supplied to the heater according to the increase and decrease of the compressed gas. Adjust the temperature by changing the amount of electricity,
There is no need to provide a pressure regulating valve to release excess atmospheric gas to the outside and keep the pressure constant. In this regard,
Initially, the internal pressure of the furnace body was expected to increase, but when the furnace body was put into practice, the furnace body was not completely airtight, and the amount of atmospheric gas leakage and compression from the seams of the door arrowhead and the introduction hole of the thermocouple etc. The internal pressure did not rise due to the balance of the amount of gas introduced. Therefore, in the case of an inert gas atmosphere, it is not necessary to provide a dedicated pressure adjusting valve, and the internal pressure does not increase just by providing a pressure adjusting hole as needed. The gas mixer 1 described above can be used as a brazing device in a non-oxidized state when an inert gas such as nitrogen gas is used as the compressed gas.

[0021]

As apparent from the above embodiments, the following effects can be expected according to the present invention. First, in the gas mixer of the present invention, the compressed gas introduced through the inclined introduction pipe is injected from the tapered orifice in such a manner as to converge on the axial center toward the front side of the flow path, and the mixer body section Was made to collide with the atmosphere gas existing in the internal flow path of the above and stirred and mixed. As a result, the number of baffle members obstructing the flow path of the compressed gas is reduced, and the compressed gas is jetted to the center of the atmosphere gas along the flow path, so that effective mixing can be performed with less pressure loss than the conventional structure. it can. When the injection nozzle is rotated to change the screwing state with the mixer main body, the opening width is varied while the orifice keeps the tapering shape, and the flow rate of the mixed gas is maintained with the flow rate of the compressed gas kept constant. And the flow rate can be adjusted as desired. Thus, for example, when used as a stirring and mixing means of a heating device such as a flow-type heat treatment furnace, as in a conventional structure gas mixer that adjusts the flow rate and flow rate of the mixed gas by increasing or decreasing the flow rate of the compressed gas. Since the flow rate of the compressed gas introduced into the furnace does not fluctuate, the temperature can be adjusted by varying the amount of electricity supplied to the heater in accordance with the increase or decrease in the compressed gas, or a pressure regulating valve can be provided to remove excess atmospheric gas to the outside. It is not necessary to release the pressure and keep the pressure constant, which makes it easier to control the temperature and pressure of the atmospheric gas in the furnace. further,
The components do not include components such as rubber packing that are difficult to obtain heat resistance, and there is no other element that deteriorates or breaks down easily even when used in a high-temperature gas atmosphere. It is possible to provide a device that can be used in a high-temperature atmosphere without limitation and that does not require maintenance and inspection costs.

[0022] In the flow air type heating apparatus of the present invention then, using a gas mixer described above as stirring and mixing means ambient gas,
A low-temperature compressed gas introduced from the outside is injected from the tapered orifice toward the front side of the flow path in such a manner as to converge to the axial center, and is caused to collide with the atmosphere gas present in the internal flow path of the mixer main body. The mixed gas is stirred and mixed, the compressed gas is heated to a temperature substantially equal to that of the atmosphere gas, and the mixed gas is blown to a heater to be heated. At the same time, the atmosphere gas is sucked from the suction port, and the stirring and mixing is performed while the atmosphere gas is circulated in the furnace. . In the gas mixer, by injecting the pressure fluid from the tapered orifice toward the front side of the flow path so as to converge on the axial center, the mixing with the atmospheric gas is performed in a state where the pressure loss is small. The cold pressure fluid is immediately converted to a gas mixture at a temperature approximately equal to the ambient gas. In addition, unlike the conventional case where the high-temperature gas mixture is blown to the heater to heat it, the low-temperature gas introduced into the furnace is directly blown to the heater to heat the gas mixture. Since the temperature is instantaneously heated to a predetermined temperature without lowering the temperature, uniform stirring can be obtained without causing variation in the temperature distribution in the furnace. In addition, since stirring is performed without using a fan, various problems that occur when a fan is used, such as the fact that power consumption is large and uneconomical, that noise that impairs the surrounding environment, and Deterioration of the product quality due to contamination of the inside of the furnace due to vibration applied to the processed material and fine dust generated from moving parts of the fan, etc. If a filter is installed inside to prevent this contamination, the equipment will become large Etc. are all resolved.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a gas mixer according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the gas mixer of FIG.

FIGS. 3A and 3B are schematic views showing a flowing air heat treatment furnace using the gas mixer of FIG. 1 as a stirring and mixing means, wherein FIG. 3A is a front view of a cross section, and FIG.

FIG. 4 is a block diagram of the flowing air heat treatment furnace of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas mixer 2 Mixer main body 3 Compressed gas introduction part 4 Mixed gas injection part 5 Internal flow path 6 Intake port 7 Female thread part 8 Annular introduction groove 9 Conical convex part 10 Male thread part 11 Feed pipe 12 Introduction pipe 13 Discharge Outlet 14 Injection nozzle 15 Male screw part 16 Connecting cylinder 17 Conical concave part 18 Orifice 19 Lock nut 20 Scale indication 21 Compressed gas 22 Atmospheric gas 23 Mixed gas 24 Furnace body 25 Heater 26 Heat source part 27 Workpiece 28 Heat treatment part 29 Heat shield Body 30 Temperature sensor 31 Temperature controller 32 Outflow path 33 Inflow path

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B01F 3/00-3/22 B01F 5/00-5/26 F27D ⁷ /00-7/06

Claims (4)

(57) [Claims] 1. A mixer body for forming an atmosphere gas flow path, a compressed gas introduction section for introducing a compressed gas, and a mixed gas injection for mixing the atmosphere gas and the compressed gas and injecting the mixed gas at a high pressure. The mixer main body is a cylindrical tubular body having an internal flow path formed along the axial direction, and a suction port for communicating the internal flow path with the outside where the atmospheric gas is present on the rear side. The mixed gas injection section forms an injection nozzle at the front end side of the connecting cylinder and is coaxially connected to the front side of the mixer body section, and the rear end side of the mixed gas injection section and the mixer body section An orifice is formed in a tapered ring shape whose diameter gradually decreases toward the mixed gas injection part side by an intermediate part of the part, and an annular introduction groove is formed on an outer peripheral side of the orifice, and the compressed gas introduction part is connected to the orifice. Guide inclined in the same direction The leading end of the inlet pipe is opened in the annular introduction groove and connected integrally with the mixer main body, and the mixed gas injection section adjusts the passage width of the orifice by connecting the connection cylinder to the mixer main body. The orifice is screwed forward and backward, and the orifice has a conical convex surface formed on the mixer main body side, the tip side of which gradually decreases in diameter, and the conical convex surface on the mixed gas injection unit side. It is constituted by a gap between conical concave portions formed in opposing complementary shapes, and the gap can be variably set according to a screwing state of the mixed gas injection section in which the connection cylinder is screwed to the mixer main body. And check the opening state of the orifice from outside
A gas mixer having a scale display . 2. A heating device body filled with an atmosphere gas, a heat source unit provided with a heating unit for the atmosphere gas, and a heat treatment unit containing an object to be heat-treated by the atmosphere gas are provided. While heating the atmosphere gas by the heating means while replenishing a low-temperature gas from the outside to the heat source section side, the heated atmosphere gas is heat-treated with the heat source section by the stirring and mixing means provided in the heating device body. In a flow-type heat treatment apparatus for performing heat treatment of the object to be processed by circulating between the sections, a gas mixer is used as a stirring and mixing means of the atmospheric gas, and the gas mixer is used for introducing a low-temperature compressed gas. One end of the compressed gas introduction unit is mounted on the heat source unit side in a state of protruding to the outside of the heating device body , the gas mixer,
A mixer body forming an atmosphere gas flow path and a compressed gas
A compressed gas introduction part for introducing air , the above-mentioned atmospheric gas and compressed air
Mixed gas injection that mixes the body and injects the mixed gas at high pressure
And the mixer main body has an internal portion along the axial direction.
A cylindrical body with a flow path formed, and an atmosphere
Suction port that connects the internal flow path with the outside where gas is present
And the above-mentioned mixed gas injection unit is provided with an injection nozzle at the end of the connecting cylinder.
Form a nozzle and connect it coaxially to the front side of the mixer body.
And the rear end side of the mixed gas injection unit and the mixer body
Of the mixed gas injection section
When an orifice is formed in a tapered ring shape
In addition, an annular introduction groove is formed on the outer peripheral side of the orifice.
The compressed gas introduction part is inclined in the same direction as the orifice.
Open the tip of the inclined introduction pipe into the annular introduction groove.
To the mixer body,
The projecting part can adjust the passage width of the orifice,
The cylinder is screwed forward and backward with the front side of the mixer body,
The orifice has a tip formed on the mixer body side.
The conical convex part whose end side gradually decreases in diameter and the above mixed gas injection
On the projecting portion side, a complementary shape is formed facing the conical convex surface portion.
Formed between the conical concave portions,
The mixed gas injection unit in which the connection cylinder is screwed to the mixer body
Wherein the gap can be variably set depending on the screwing state of the air flow type heat treatment apparatus. 3. The gas mixer directs an injection nozzle of the mixed gas injection section toward the heating means, and opens a suction port of the mixer body to an inflow side where atmospheric gas is returned from the heat treatment section. And placed adjacent to the heating means
A flow-type heat treatment apparatus according to claim 2 . 4. The gas mixer according to claim 1, wherein a suction port of the mixer main body for suctioning the atmospheric gas in the heating device main body is orthogonal to an axial direction in which an injection nozzle for jetting the mixed gas extends. 4. The flow-type heat treatment according to claim 2 , wherein the suction port is provided at a corner of the heat source portion so as to open to an inflow side where the atmospheric gas returns from the heat treatment portion. apparatus.