CN218296451U

CN218296451U - Double-cavity vacuum oven with high uniformity

Info

Publication number: CN218296451U
Application number: CN202222129438.2U
Authority: CN
Inventors: 廖益裕
Original assignee: Jufu Instruments Suzhou Co ltd
Current assignee: Jufu Instruments Suzhou Co ltd
Priority date: 2022-08-12
Filing date: 2022-08-12
Publication date: 2023-01-13
Anticipated expiration: 2032-08-12

Abstract

The utility model provides a two cavities vacuum oven of high homogeneity, include: the device comprises a box body, an installation groove arranged at the upper part of the box body, a heat transfer cavity arranged in the middle of the installation groove and a test cavity arranged in the middle of the heat transfer cavity; the outer end surfaces of the mounting groove, the heat transfer cavity and the test cavity are flush, a box door is hinged to the mounting groove, the heat transfer cavity and the test cavity, and the box door is in sealing fit with the test cavity; the test chamber is connected with a vacuum pump, and a heat transfer assembly which is used for forming a soaking space between the heat transfer chamber and the test chamber and uniformly transferring heat to the inside of the test chamber is arranged in the heat transfer chamber. Form inside and outside bilayer structure, to the interstitial space heating between the test chamber of outer heat transfer chamber and inlayer, utilize the air to carry out the uniform heat transfer to the test chamber outer wall as heat transfer medium, the test chamber outer wall receives the uniform heating and passes to the test chamber inside by the chamber wall, and the inside air medium of test chamber is by vacuum pump evacuation or negative pressure state, and the heat passes to the test chamber in with the form of diversified radiation, has improved the inside temperature homogeneity of test chamber when the temperature risees.

Description

Double-cavity vacuum oven with high uniformity

Technical Field

The utility model relates to an environmental simulation test technical field especially relates to a double cavities vacuum oven of high homogeneity.

Background

A vacuum oven is a box type drying device for drying materials under negative pressure. Its working principle is that a vacuum pump is used to pump air and dehumidify, so that a vacuum state is formed in the working chamber, the boiling point of water is reduced, and the drying speed is accelerated. The heating wire is usually arranged in the vacuum chamber in the existing vacuum oven to heat the environment in the vacuum chamber, but in the mode, the temperature close to the heating wire is relatively high, the temperature far away from the heating wire is relatively low, the temperature uniformity in the vacuum chamber is poor, and the temperature in each part of the vacuum chamber is not uniform easily.

SUMMERY OF THE UTILITY MODEL

In view of the above shortcoming of the prior art, an object of the utility model is to provide a double cavity vacuum oven of high homogeneity for the relatively poor problem of temperature homogeneity when vacuum oven heats among the solution prior art.

In order to realize above-mentioned purpose and other relevant purposes, the utility model provides a double cavity vacuum oven of high homogeneity, include: the device comprises a box body, an installation groove arranged at the upper part of the box body, a heat transfer cavity arranged in the middle of the installation groove and a test cavity arranged in the middle of the heat transfer cavity; the outer end surfaces of the mounting groove, the heat transfer cavity and the test cavity are flush, a box door is hinged to the mounting groove, the heat transfer cavity and the test cavity, and the box door is in sealing fit with the test cavity; the test chamber is connected with a vacuum pump, and a heat transfer assembly which is used for forming a soaking space between the heat transfer chamber and the test chamber and uniformly transferring heat to the inside of the test chamber is arranged in the heat transfer chamber.

Through adopting above-mentioned technical scheme, form inside and outside bilayer structure, to the clearance space heating between the test chamber of outer heat transfer chamber and inlayer, utilize the air to carry out even heat transfer to the test chamber outer wall as heat transfer medium, the test chamber outer wall receives even heating and passes to the test chamber by the chamber wall inside, and the inside air dielectric of test chamber is by vacuum pump evacuation or negative pressure state, the heat passes to the test chamber in with diversified radiant form, the inside temperature homogeneity of test chamber when having improved the temperature rise.

In an embodiment of the present invention, the heat transfer assembly includes: a turbo fan disposed at a rear side of the heat transfer chamber; the turbo fan includes: the device comprises a machine shell arranged in the lower part of the rear side of a heat transfer cavity, an air outlet arranged at the lower part of the machine shell, an air suction opening arranged at one side of the machine shell close to a test cavity, an impeller arranged in the machine shell in the middle, and a blower motor arranged at one side of the impeller back to the air suction opening and in driving connection with the impeller; the air outlet is arranged downwards; the test chamber is characterized in that a wind shield is horizontally arranged on the lower portion of the rear side of the test chamber, the horizontal height of the wind shield is located between an air suction opening and an air outlet, one side of the wind shield is fixedly connected with the outer wall of the test chamber, the other side of the wind shield is fixedly connected with the inner wall of a heat transfer chamber, and the air suction opening of the turbofan penetrates through the wind shield.

In an embodiment of the present invention, the heat transfer assembly further includes: and the electric heater is arranged at the air inlet of the turbofan.

Through adopting above-mentioned technical scheme, form circulation wind channel: air enters from the air suction opening, is heated by the electric heater, is driven by the impeller to be discharged from the air outlet downwards, flows from back to front below the test cavity, flows from bottom to top on the left side and the right side of the test cavity, converges to the upper part of the test cavity, then flows from front to back above the test cavity, flows from top to bottom when flowing to the rear part of the test cavity, and is blocked by the wind shield to flow back again to enter the air suction opening to form air path circulation; in the process of continuous circulation of the air path, air uniformly flows to all corners of a gap space between the test cavity and the heat transfer cavity after being heated in each circulation to form a soaking space, so that the consistency of the temperature of all parts of the outer wall of the test cavity is ensured, and the temperature uniformity in the test cavity is further improved when the temperature rises

In an embodiment of the present invention, the heat-insulating layer is filled in the gap between the heat-transferring cavity and the mounting groove.

In an embodiment of the present invention, the heat-insulating layer is made of PU polyurethane foaming heat-insulating material.

Through adopting above-mentioned technical scheme, prevent that the soaking space heat between test chamber and the heat transfer chamber from outwards running off, causing extra energy consumption.

In an embodiment of the present invention, the heat transfer chamber upper portion is provided with an air outlet through the heat preservation layer, and the heat transfer chamber middle portion is provided with an air inlet through the heat preservation layer.

By adopting the technical scheme, when the temperature rises, the air volume in the soaking space between the test chamber and the heat transfer chamber is increased, the pressure intensity is increased, the redundant air can be released outwards from the air outlet, meanwhile, the hot air naturally rises, and the air outlet arranged at the upper part is beneficial to the natural release of the redundant air; when the temperature is reduced, the air volume in the soaking space between the test chamber and the heat transfer chamber is reduced, the pressure intensity is reduced, and supplementary air can be absorbed from the air inlet.

In an embodiment of the present invention, the air outlet and the air inlet are respectively provided with a filter plate and a louver.

By adopting the technical scheme, the shutter reduces the ventilation quantity of the air inlet and the air outlet, and prevents the external environment from causing great influence on the soaking space between the test cavity and the heat transfer cavity due to overlarge ventilation quantity; the filter plate prevents dust from entering and blocking the tuyere.

In an embodiment of the present invention, the wall of the test chamber is made of a heat conductive material.

By adopting the technical scheme, the heat transfer efficiency from the soaking space between the test cavity and the heat transfer cavity to the interior of the test cavity is improved.

In an embodiment of the present invention, a first temperature sensor is disposed on the wall of the test cavity, and an air pressure sensor is disposed in the test cavity; a second temperature sensor is arranged in the heat transfer cavity and located below the air outlet.

Through adopting above-mentioned technical scheme, but first temperature sensor real-time supervision test intracavity ambient temperature, atmospheric pressure sensor can assist and judge test intracavity evacuation degree, but second temperature sensor real-time supervision turbofan's the temperature of airing exhaust.

As above, the utility model discloses a two cavities vacuum oven of high homogeneity has following beneficial effect:

1. an inner-outer double-layer structure is formed, a gap space between the outer-layer heat transfer cavity and the inner-layer test cavity is heated, air is used as a heat transfer medium to uniformly transfer heat to the outer wall of the test cavity, the outer wall of the test cavity is uniformly heated and transferred to the inside of the test cavity from the cavity wall, the air medium in the test cavity is vacuumized or in a negative pressure state by a vacuum pump, heat is transferred to the inside of the test cavity in a multi-azimuth radiation heat transfer mode, and the temperature uniformity in the test cavity when the temperature rises is improved;

2. the air path circulation is formed in the clearance space between the test cavity and the heat transfer cavity, air is heated by the electric heater and uniformly flows to all corners of the clearance space every time the air circulates, the soaking space is formed, the temperature consistency of all parts of the outer wall of the test cavity is guaranteed, and the temperature uniformity inside the test cavity is further improved when the temperature rises.

Drawings

Fig. 1 shows a schematic view of a right side view of a dual-cavity vacuum oven with high uniformity disclosed in an embodiment of the present invention.

Fig. 2 is an enlarged view of a portion a of fig. 1.

Description of the reference numerals

1, a box body; 2-mounting grooves; 21-an insulating layer; 3-a heat transfer chamber; 31-a wind deflector; 32-air outlet; 33-an air inlet; 4-a test cavity; 5-a box door; 6-a heat transfer component; 61-a turbo fan; 611-a housing; 612-air outlet; 613-air suction opening; 614-impeller; 615-a blower motor; 62-an electric heater; 7-a first temperature sensor; 8-a barometric sensor; 9-second temperature sensor.

Detailed Description

The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.

Please refer to fig. 1-2. It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.

Referring to fig. 1-2, the present invention provides a dual-cavity vacuum oven with high uniformity, comprising: the device comprises a box body 1, a mounting groove 2 arranged at the upper part of the box body 1, a heat transfer cavity 3 arranged in the middle of the mounting groove 2 and a test cavity 4 arranged in the middle of the heat transfer cavity 3; the outer end faces of the mounting groove 2, the heat transfer cavity 3 and the test cavity 4 are flush, a box door 5 is hinged, and the box door 5 is in sealing fit with the test cavity 4; the test cavity 4 is connected with a vacuum pump, and a heat transfer component 6 which is used for forming a soaking space between the heat transfer cavity 3 and the test cavity 4 and uniformly transferring heat to the interior of the test cavity 4 is arranged in the heat transfer cavity 3; form inside and outside bilayer structure, the clearance space heating between the test chamber 4 of the heat transfer chamber 3 of outer layer and inlayer, utilize the air to carry out even heat transfer to the 4 outer walls of test chamber as heat transfer medium, the 4 outer walls of test chamber receive even heating and pass to the test chamber 4 inside by the chamber wall, and the inside air medium of test chamber 4 is by vacuum pump evacuation or negative pressure state, the heat passes to the test chamber 4 in with the form of diversified radiation heat transfer, the inside temperature homogeneity of test chamber 4 when having improved the temperature and rising.

The heat transfer assembly 6 includes: a turbo fan 61 disposed at a rear side of the heat transfer chamber 3; the turbo fan 61 includes: a machine shell 611 arranged in the lower part of the rear side of the heat transfer cavity 3, an air outlet 612 arranged in the lower part of the machine shell 611, an air suction opening 613 arranged at one side of the machine shell 611 close to the test cavity 4, an impeller 614 arranged in the machine shell 611 in the middle, and a blower motor 615 arranged at one side of the impeller 614 opposite to the air suction opening 613 and in driving connection with the impeller 614; the air outlet 612 is arranged in a downward direction; a wind shield 31 is horizontally arranged at the lower part of the rear side of the test chamber 4, the horizontal height of the wind shield 31 is positioned between an air suction port 613 and an air exhaust port 612, one side of the wind shield 31 is fixedly connected with the outer wall of the test chamber 4, the other side of the wind shield 31 is fixedly connected with the inner wall of the heat transfer chamber 3, and the air suction port 613 of the turbo fan 61 penetrates through the wind shield 31; the heat transfer assembly 6 further comprises: an electric heater 62 provided at the air intake 33 of the turbo fan 61; forming a circulating air duct: air enters from the air suction opening 613, is heated by the electric heater 62, is driven by the impeller 614 to be discharged downwards from the air discharge opening 612, flows backwards and forwards below the test chamber 4, flows downwards and upwards on the left side and the right side of the test chamber 4 at the same time, converges to the upper part of the test chamber 4, then flows forwards and backwards above the test chamber 4, flows downwards when flowing to the rear part of the test chamber 4, and is blocked by the wind shield 31 to flow backwards again to enter the air suction opening 613, so that air path circulation is formed; in the process that the air path is continuously circulated, air uniformly flows to all corners of a gap space between the test chamber 4 and the heat transfer chamber 3 after being heated in each circulation to form a soaking space, so that the temperature consistency of all parts of the outer wall of the test chamber 4 is ensured, and the temperature uniformity inside the test chamber 4 is further improved when the temperature rises

The gap between the heat transfer cavity 3 and the mounting groove 2 is filled with a heat insulation layer 21, the heat insulation layer 21 is made of PU polyurethane foaming heat insulation materials, and the heat of the soaking space between the test cavity 4 and the heat transfer cavity 3 is prevented from being lost outwards to cause extra energy consumption.

An air outlet 32 penetrating through the heat insulation layer 21 is arranged at the upper part of the heat transfer cavity 3, and an air inlet 33 penetrating through the heat insulation layer 21 is arranged at the middle part of the heat transfer cavity 3; when the temperature rises, the volume of air in the soaking space between the test chamber 4 and the heat transfer chamber 3 is increased, the pressure intensity is increased, the excess air can be released outwards from the air outlet 32, meanwhile, the hot air naturally rises, and the air outlet 32 arranged at the upper part is beneficial to the natural release of the excess heat air; when the temperature is lowered, the volume of air in the soaking space between the test chamber 4 and the heat transfer chamber 3 is reduced, the pressure is reduced, and the supplementary air can be absorbed from the air inlet 33.

The outer end faces of the air outlet 32 and the air inlet 33 are respectively provided with a filter plate and a shutter; the shutter reduces the ventilation volume of the air inlet 33 and the air outlet 32, and prevents the external environment from causing great influence on the soaking space between the test chamber 4 and the heat transfer chamber 3 due to overlarge ventilation volume; the filter plate prevents dust from entering and blocking the tuyere.

The wall of the test cavity 4 is made of heat conducting materials, so that the heat transfer efficiency from the soaking space between the test cavity 4 and the heat transfer cavity 3 to the interior of the test cavity 4 is improved.

A first temperature sensor 7 is arranged on the wall of the test cavity 4, and an air pressure sensor 8 is arranged in the test cavity 4; a second temperature sensor 9 is arranged in the heat transfer cavity 3, and the second temperature sensor 9 is positioned below the air outlet 612; but the ambient temperature in real-time supervision test chamber 4 of first temperature sensor 7, baroceptor 8 can assist and judge evacuation degree in the test chamber 4, but the temperature of airing exhaust of real-time supervision turbofan 61 of second temperature sensor 9.

The utility model discloses a theory of operation of double cavities vacuum oven of high homogeneity does: form inside and outside bilayer structure, the clearance space heating between outer heat transfer chamber 3 and the test chamber 4 of inlayer utilizes the air as heat transfer medium to carry out even heat transfer to test chamber 4 outer wall, and the circulation wind channel direction in the clearance space is: air enters from the air suction opening 613, is heated by the electric heater 62, is driven by the impeller 614 to be discharged downwards from the air outlet 612, flows forwards from the back below the test chamber 4, flows upwards from the bottom to the top of the test chamber 4, flows backwards from the front above the test chamber 4, flows downwards from the top to the bottom after flowing to the back of the test chamber 4, is blocked by the wind shield 31 to flow back into the air suction opening 613 again to form continuous circulation of the air duct, and uniformly flows to each corner of the gap space between the test chamber 4 and the heat transfer chamber 3 after being heated in each circulation to form a soaking space, so that the temperature uniformity of each position of the outer wall of the test chamber 4 is ensured, the outer wall of the test chamber 4 is uniformly heated and is transferred to the inside of the test chamber 4 by the chamber wall, the air medium in the test chamber 4 is pumped to be in a vacuum or negative pressure state by a vacuum pump, heat is transferred to the test chamber 4 in a multi-directional radiation heat transfer mode, and the temperature uniformity of the inside the test chamber 4 is ensured when the temperature rises.

To sum up, the utility model discloses form inside and outside bilayer structure, to the clearance space heating between the heat transfer chamber 3 of outer layer and the test chamber 4 of inner layer, utilize the air to carry out even heat transfer to the outer wall of test chamber 4 as heat transfer medium, the outer wall of test chamber 4 receives even heating and passes to the inside of test chamber 4 by the chamber wall, and the air medium of the inside of test chamber 4 is vacuumized or negative pressure state by the vacuum pump, the heat passes to the inside of test chamber 4 in the form of diversified radiation heat transfer, the temperature homogeneity of the inside of test chamber 4 when having improved the temperature and rising; an air path circulation is formed in the clearance space between the test chamber 4 and the heat transfer chamber 3, air is heated by the electric heater 62 and uniformly flows to all corners of the clearance space every time the air circulates, a soaking space is formed, the temperature consistency of all positions of the outer wall of the test chamber 4 is ensured, and the temperature uniformity inside the test chamber 4 when the temperature rises is further improved. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention shall be covered by the claims of the present invention.

Claims

1. A high homogeneity double cavity vacuum oven, characterized in that includes: the device comprises a box body (1), a mounting groove (2) arranged at the upper part of the box body (1), a heat transfer cavity (3) arranged in the middle of the mounting groove (2), and a test cavity (4) arranged in the middle of the heat transfer cavity (3); the outer end faces of the mounting groove (2), the heat transfer cavity (3) and the test cavity (4) are flush, a box door (5) is hinged, and the box door (5) is in sealing fit with the test cavity (4); the test chamber (4) is connected with a vacuum pump, and a heat transfer component (6) which is used for forming a soaking space between the heat transfer chamber (3) and the test chamber (4) and uniformly transferring heat to the interior of the test chamber (4) is arranged in the heat transfer chamber (3).

2. The high uniformity dual cavity vacuum oven of claim 1, wherein: the heat transfer assembly (6) comprises: a turbo fan (61) disposed at the rear side of the heat transfer chamber (3); the turbo fan (61) includes: a machine shell (611) arranged in the lower part of the rear side of the heat transfer cavity (3), an air outlet (612) arranged at the lower part of the machine shell (611), an air suction opening (613) arranged at one side of the machine shell (611) close to the test cavity (4), an impeller (614) arranged in the machine shell (611) in the middle, and a blower motor (615) arranged at one side of the impeller (614) opposite to the air suction opening (613) and in driving connection with the impeller (614); the air outlet (612) is arranged downwards; test chamber (4) rear side lower part level is provided with deep bead (31), deep bead (31) level is located between inlet scoop (613) and air exit (612), deep bead (31) one side and test chamber (4) outer wall fixed connection, opposite side and heat transfer chamber (3) inner wall fixed connection, inlet scoop (613) of turbofan (61) run through deep bead (31).

3. The high uniformity dual cavity vacuum oven of claim 2, wherein: the heat transfer assembly (6) further comprises: an electric heater (62) arranged at an air inlet (33) of the turbo fan (61).

4. The high uniformity dual cavity vacuum oven of claim 3, wherein: and a heat insulation layer (21) is filled in a gap between the heat transfer cavity (3) and the mounting groove (2).

5. The high uniformity dual cavity vacuum oven of claim 4, wherein: the heat-insulating layer (21) is made of PU polyurethane foaming heat-insulating materials.

6. The high uniformity dual cavity vacuum oven of claim 4, wherein: an air outlet (32) penetrating through the heat insulation layer (21) is formed in the upper portion of the heat transfer cavity (3), and an air inlet (33) penetrating through the heat insulation layer (21) is formed in the middle of the heat transfer cavity (3).

7. The high uniformity dual cavity vacuum oven of claim 6, wherein: and the outer end faces of the air outlet (32) and the air inlet (33) are respectively provided with a filter plate and a shutter.

8. The high uniformity dual cavity vacuum oven of claim 1, wherein: the wall of the test cavity (4) is made of heat conducting material.

9. The high uniformity dual cavity vacuum oven of claim 8, wherein: a first temperature sensor (7) is arranged on the wall of the test cavity (4), and an air pressure sensor (8) is arranged in the test cavity (4); a second temperature sensor (9) is arranged in the heat transfer cavity (3), and the second temperature sensor (9) is located below the air outlet (612).