CN210569578U - Laboratory oven with variable volume - Google Patents

Abstract

The application discloses variable volume laboratory oven, the utility model relates to a laboratory glassware field especially relates to the heating baking equipment of experiment usefulness. The electric heating baking oven comprises an oven body, an oven front door hinged to the oven body, an electric heating baking unit in the oven body, a temperature controller connected with the temperature controller and used for adjusting and controlling the temperature of the electric heating baking unit and a temperature sensor connected with the temperature controller and used for sensing and transmitting the temperature in the oven to the temperature controller in real time, the oven body is further connected with an oven rear door in a sliding and sealing mode and used for adjusting the size of an oven baking inner cavity, and an adjuster used for adjusting the heating area of the electric heating baking unit is arranged on the side. The utility model is used for the realization is adjusted the effective inner chamber volume size that toasts of laboratory oven, reaches the unnecessary volume that reduces unnecessary heating, reaches an energy-conserving purpose.

Description

Laboratory oven with variable volume

Technical Field

The utility model relates to an experimental apparatus field especially relates to the heating equipment of toasting of experiment usefulness, concretely relates to variable volume laboratory oven.

Background

The laboratory oven is used for drying, wax melting and sterilization of industrial and mining enterprises, universities and colleges, scientific research, medical institutions, various laboratories and the like. The existing oven body of the laboratory oven is usually manufactured by argon arc welding or the inner container and the outer container are formed by bending galvanized plates and stainless steel, so that the shape is attractive and novel. The intelligent microcomputer control has the PID self-tuning function, the temperature control accuracy can reach the ideal temperature control precision, and double-row digital display is realized. The drying box can be timed according to 0-999 minutes after being heated to the temperature, and the heating power supply is closed when the drying box reaches the time. The hot air internal circulation is adopted in part of the drying oven to ensure the temperature uniformity, and a heat-resistant silicone rubber ring is arranged at the joint of the working chamber of the inner cavity of the drying oven and the oven door to ensure the sealing between the working chamber and the oven door. In the aspect of safety protection, the existing oven uses a temperature-limiting alarm system, when the temperature exceeds the limiting temperature, the temperature is automatically interrupted, and the safe operation of the experiment is ensured not to be unexpected.

However, the existing oven is no exception of adopting a fixed baking inner cavity, which cannot change the effective baking inner cavity, resulting in large energy consumption and much waste. For example, a laboratory needs to bake and dry a small amount of chemical reagents or sterilize for some experimental needs, and only needs a small space and can achieve the purpose by keeping the chemical reagents for a certain time under the specified temperature condition; by adopting the existing oven, no matter how many articles need to be heated and baked, the baking space of the whole oven needs to be heated to a specified temperature, so that great electric energy waste is caused. Therefore, the size of the heating inner cavity can be set according to the amount of the baked goods, the effective utilization of the electric energy can be improved, the unnecessary electric energy loss is avoided, and the energy-saving effect is achieved.

The applicant has searched two prior patent documents close to the present application, and provided summary information as follows:

prior art 1: CN201721038931.6 discloses a laboratory oven. The oven comprises a box body, a heating plate and a placing frame are arranged in the box body, an exhaust port is arranged above the box body, a filtering device is arranged at the exhaust port, the filtering device comprises a first filtering net and a second filtering net, and an adsorbent is arranged between the first filtering net and the second filtering net; the air outlet is provided with an exhaust fan, the heating plate is provided with an air blower, the air blower is connected with an air outlet pipeline, and an air outlet is formed in the air outlet pipeline. The laboratory oven of the utility model has simple structure, and blows hot air in the box body by the blower to heat the articles; through setting up filter equipment, the smell that produces in the adsorption oven is fit for the laboratory, reduces the damage that reagent produced to the staff.

Prior art 2: CN201810668067.0 discloses a laboratory oven, which comprises a box body, a feeding transmission device, a discharging transmission device, a control system and a supporting tray, wherein the box body comprises an inlet and an outlet, a heater is arranged in the box body, an automatic door is arranged at the inlet and the outlet of the box body, the box body transmission device is arranged at the bottom of the box body, the feeding transmission device, the discharging transmission device and the box body transmission device all comprise a driving motor, a worm and a roller, the feeding transmission device, the box body transmission device and the discharging transmission device are sequentially and horizontally arranged, position sensors are arranged at two ends of the feeding transmission device, two ends of the discharging transmission device and two ends of the box body transmission device, and the box body, the feeding transmission device, the discharging transmission device and the control system are electrically connected. Through the structure, when the laboratory oven is operated, a person does not need to directly contact high temperature, and instruments or chemicals are automatically conveyed into the box body through the feeding and discharging transmission device to be heated and dried

SUMMERY OF THE UTILITY MODEL

In order to solve the problems that the baking inner cavity of the existing laboratory oven cannot be adjusted to cause high energy consumption and poor energy-saving effect, the application provides a variable-volume laboratory oven which is used for adjusting the volume of the effective baking inner cavity of the laboratory oven, reducing unnecessary heating redundant volume and achieving an energy-saving purpose.

In order to achieve the purpose, the technical scheme adopted by the application is as follows:

the utility model provides a variable volume laboratory oven, includes the box, articulates the case qianmen on the box, installs electric heat in the box toasts the unit to and be used for adjusting and controlling the temperature controller of electric heat toasts the unit and be connected with the temperature controller and with the temperature sensor of the real-time sensing conveying of temperature to the temperature controller in the oven, the box is the airtight connection that slides still is used for adjusting the oven and toasts the case back door of inner chamber size, the box lateral wall is provided with and is used for adjusting the electric heat toasts the regulator of unit heat area that generates heat. The box front door is a channel for taking and placing articles to be baked and is also a window for observing the baking process, and in order to realize real-time observation, high-temperature-resistant tempered glass can be embedded on the box front door, so that the observation effect of the baking process can be improved. The working principle of the technical scheme is as follows: use the utility model discloses when toasting, at first, the article that will toast are placed in the box, according to article occupation space's actual conditions, the regulating box back door makes the inner space of box under the condition that does not influence article and place, and is as little as possible, after the definite position, the regulator of adjustment box side makes the position of regulator flush with the position of case back door, closes at last the case qianmen carry out the ohmic heating can. The temperature controller compares the temperature information from the temperature sensor with the set temperature information, and if the temperature acquired by the temperature sensor is lower than the set temperature, the temperature controller enables the electric heating baking unit to keep a heating state; when the temperature collected by the temperature sensor is equal to the set temperature, the temperature controller enables the electric heating baking unit to keep a heat preservation state; on the contrary, if the temperature collected by the temperature sensor is higher than the set temperature, the temperature controller enables the electric heating baking unit to be in a power-off state to stop heating, and the working state is repeated until the temperature slowly drops to the set value, so that the purpose of heat preservation or baking according to the preset temperature is achieved. The closed-loop feedback control principle is a mature technology currently applied to laboratory ovens. For example, various oven devices manufactured by Suzhou Bin Yuan oven manufacturing Limited have the above-mentioned control functions, and in the technical scheme, the temperature control system is not improved, and the existing mature temperature control system is adopted, so the temperature control plate part is not described in detail.

Preferably, the electric heating baking unit comprises at least one group of resistance wires which are arranged in a reciprocating parallel folding manner, and each folding loop of the resistance wires is electrically connected with the regulator through a branch wire. The heat generation in this application derives from the resistance wire, generates heat through the resistance wire through the electric current, turns back the resistance wire according to the parallel and arranges to the technical problem who turns back the solution that the circuit is connected with the regulator electricity through the branch line on every is exactly to change the effective length that the resistance wire participated in generating heat. Because the resistance wires are arranged in the side wall of the box body in a parallel folding mode, the regulator slides for the distance of one folding circuit in the direction of the front door of the box, so that the resistance wires participating in heating have one less folding circuit unit, and the consumption of electric energy is reduced. Therefore, when the distance between the rear door and the front door of the box reaches the minimum, the heating wires participating in heating are the minimum, and the power consumption is the minimum at the moment; on the contrary, when the distance between the rear door and the front door of the box reaches the maximum, the heating wires participating in heating are the longest, and the electric energy consumption is the largest at the moment. Because when changing the position of regulator, the position of case back door also will correspond the adjustment, consequently to the effective area that generates heat that the oven cavity space volume that needs the heating corresponds, consequently, the size change in space changes the height of energy consumption, can not influence the efficiency of heating, that is to say can not produce any negative influence to the oven after having adjusted case back door position, just can reduce the energy consumption of oven.

Preferably, the side wall of the box body is provided with an adjusting groove for installing the adjuster, the adjuster comprises a conductive cross rod arranged along the length direction of the adjusting groove, the conductive cross rod is alternately provided with conductive segments and insulating segments, and the branch line is electrically connected with the conductive segments; and the conductive cross bar is connected with a sleeve contact in a sliding manner. The sleeve contacts which slide along the conductive cross rod are arranged, and the conductive cross rod is arranged into a conductive section and an insulating section, so that convenience in adjusting the length of the heating resistance wire can be improved. The length of the sleeve contact is set to be larger than that of the insulating section, so that the sleeve contact can be effectively contacted with at least one conductive section for conduction no matter the sleeve contact is positioned at any position of the conductive cross rod, and the purpose of changing the length of the effective resistance wire participating in heating is achieved.

Preferably, the electric heating baking unit comprises two groups of resistance wires which are arranged in a reciprocating parallel folding manner and are respectively arranged on the inner side walls of the left side and the right side of the box body, the number of the conductive cross rods is two, each folding loop of the two groups of resistance wires is electrically connected with the conductive sections arranged on the two conductive cross rods through branch lines, and the two sleeve contacts arranged on the regulator are electrically connected through trunk lines and are respectively connected on the two conductive cross rods in a sliding manner. The purpose of adopting the above arrangement is that two groups of resistance wires positioned on the side walls of the baking oven at two sides can be adjusted simultaneously through one adjuster. Similarly, if the resistance wires are arranged on the upper side wall, the lower side wall, the left side wall and the right side wall, the regulators can be respectively arranged on the two side walls of the box body according to the scheme. Of course, the number of the resistance wires is determined according to the working environment required by the box body or the requirement of the heating efficiency, and the implementation of the technical scheme is not influenced.

Preferably, each of the folding loops of the resistance wires is fixedly connected with a heat conduction fin, and the heat conduction fins are fixedly connected with the inner side wall of the oven. The heat conduction fins are connected with the resistance wires and the inner wall of the box body, so that the heat conduction efficiency and the heat transfer uniformity can be effectively improved. The heat conducting fins are in rectangular, rhombic or triangular crossed arrangement, and can be made of copper, stainless steel or high-heat-conductivity conventional alloy materials.

Preferably, the box back door is relatively provided with two locking devices for fixing the box back door on the inner wall of the box body, each locking device comprises a locking handle hinged on the box back door, the end of each locking handle is integrated or fixedly connected with an eccentric wheel, and an elastic anti-skid device is arranged between each eccentric wheel and the inner wall of the box body.

Advantageous effects

The utility model discloses a set up the case back door that can the fore-and-aft regulation, through the distance between case back door and the case qianmen to reach and change the effectual heating of oven and toast the volume, reach energy-conserving purpose. Compared with the existing fixed box body, the whole inner cavity needs to be heated no matter how many articles are baked, so that the great waste of electric energy loss is caused; and the utility model discloses can reduce interior cavity volume and effective heating resistor silk when less article toast, like this under the prerequisite that does not influence heating efficiency, reduction electric energy loss that can be very big is obvious for current oven energy-conserving effect.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is a perspective view of the tube wall of the present invention;

FIG. 2 is a schematic view of the front door of the box of FIG. 1 in an open position;

FIG. 3 is a schematic perspective view of the outer wall of the case with the skin removed (showing the resistance wires);

FIG. 4 is a schematic diagram of the respective control of two sets of resistance wires used in example 2;

FIG. 5 is a schematic perspective view of the heat-conducting fin of FIG. 4;

FIG. 6 is a schematic perspective view of an adjuster with single-group control of resistance wires;

FIG. 7 is a schematic perspective view of an adjuster controlled by two sets of resistance wires;

FIG. 8 is a schematic diagram of the maximum energy consumption of the resistance wire;

FIG. 9 is a schematic diagram of the minimum energy consumption of resistance wires (zone A is resistance wires not involved in heating, zone B is resistance wires involved in heating);

FIG. 10 is a schematic view of a rear door of the case;

3 fig. 3 11 3 is 3 a 3 sectional 3 view 3 taken 3 along 3 a 3 sectional 3 line 3 a 3- 3 a 3 in 3 fig. 3 10 3 ( 3 mainly 3 illustrating 3 the 3 principle 3 of 3 the 3 construction 3 of 3 the 3 load 3 binder 3) 3; 3

FIG. 12 is an enlarged view of the structure of region C in FIG. 11;

in the figure: 1-a box body; 2-box front door; 3-adjusting the tank; 4-regulator, 41-bushing contact; 5-resistance wire; 6-a conductive cross-bar; 61-a conductive segment; 62-an insulating segment; 7-branch line; 8-trunk line; 9-heat conducting fins; 10-temperature controller; 11-a temperature sensor; 12-a rear door of the cabinet; 13-a locking handle; 14-an anti-skid device; 15-eccentric wheel.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the product of the application is used, the description is only for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present application. Furthermore, the appearances of the terms "first," "second," and the like in the description herein are only used for distinguishing between similar elements and are not intended to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like when used in the description of the present application do not require that the components be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Example 1:

the variable-volume laboratory oven shown in the attached drawings 1-3 and 8-10 of the specification comprises an oven body 1, an oven front door 2 hinged on the oven body 1, an electric heating baking unit installed in the oven body 1, a temperature controller 10 used for adjusting and controlling the electric heating baking unit, a temperature sensor 11 connected with the temperature controller 10 and used for sensing and transmitting the temperature in the oven to the temperature controller 10 in real time, an oven rear door 12 used for adjusting the size of a baking cavity of the oven is connected to the oven body 1 in a sliding and sealing mode, and a regulator 4 used for adjusting the heating area of the electric heating baking unit is arranged on the side wall of the oven body 1. The box front door 2 is a channel for taking and placing articles to be baked and is also a window for observing the baking process, and in order to realize real-time observation, high-temperature-resistant tempered glass can be embedded in the box front door 2, so that the observation effect of the baking process can be improved. The working principle of the technical scheme is as follows: use the utility model discloses when toasting, at first, the article that will toast are placed in box 1, according to article occupation space's actual conditions, regulating box back door 12 makes the inner space of box 1 not influence under the condition that article were placed, and is as little as possible, after confirming the position, the regulator 4 of adjustment box 1 side makes the position of regulator 4 flush with the position of box back door 12, and it can to close case qianmen 2 at last and carry out the ohmic heating. The temperature controller 10 compares the temperature information from the temperature sensor 11 with the set temperature information, and if the temperature collected by the temperature sensor 11 is lower than the set temperature, the temperature controller 10 makes the electric heating baking unit keep a heating state; when the temperature collected by the temperature sensor 11 is equal to the set temperature, the temperature controller 10 keeps the electric heating baking unit in a heat preservation state; on the contrary, if the temperature collected by the temperature sensor 11 is higher than the set temperature, the temperature controller 10 causes the electric heating baking unit to be in a power-off state to stop heating, and repeats the working state until the temperature slowly drops to the set value, thereby achieving the purpose of heat preservation or baking according to the preset temperature. The closed-loop feedback control principle is a mature technology currently applied to laboratory ovens. For example, various oven devices manufactured by Suzhou Bin Yuan oven manufacturing Limited have the above-mentioned control functions, and in the technical scheme, the temperature control system is not improved, and the existing mature temperature control system is adopted, so the temperature control plate part is not described in detail.

Example 2:

for convenience of adjustment, on the basis of the structure of embodiment 1, as further shown in fig. 4, in this embodiment, the electric heating baking unit includes at least one set of resistance wires 5 folded back and forth in parallel, and each folded-back loop of the resistance wires 5 is electrically connected to the adjuster 4 through a branch line 7. The heat generation in this application derives from resistance wire 5, generates heat through resistance wire 5 through the electric current, retraces resistance wire 5 according to the parallel and arranges to the technical problem who solves through branch line 7 and regulator 4 electricity is connected on every retracing return circuit is exactly to change the effective length that resistance wire 5 participates in generating heat. Because the resistance wires 5 are arranged in the side wall of the box body 1 in a parallel folding mode, the resistance wires 5 participating in heating have one folding loop unit less when the regulator 4 slides for the distance of one folding loop towards the front door 2 of the box, and the consumption of electric energy is reduced. It can be seen that when the cabinet back door 12 reaches the minimum distance from the cabinet front door 2, the heating wires 5 involved in heating are the minimum, and the power consumption is the minimum at this time; on the contrary, when the rear cabinet door 12 reaches the maximum distance from the front cabinet door 2, the heating wire 5 involved in heating is the longest, and the power consumption is the largest at this time. Because the position of the rear box door 12 is correspondingly adjusted when the position of the regulator 4 is changed, the effective heating area corresponding to the space volume of the inner cavity of the oven to be heated is correspondingly adjusted, and therefore, the change of the size of the space changes the energy consumption, the heating efficiency is not affected, that is, the position of the rear box door 12 is adjusted, no negative influence is caused to the use of the oven, and the energy consumption of the oven is only reduced. As shown in fig. 4, according to the above structure, two groups of resistance wires 5 can be connected to one regulator 4 respectively, and the two regulators 4 are communicated through a trunk line 8, so as to achieve the purpose of connecting the two groups of resistance wires 5 in series. The inconvenience of this arrangement is also present, that is to say the need to adjust both regulators 4 simultaneously before use, which adds some adjustment steps, but does not affect the implementation of the technique.

Example 3: in order to further simplify the operation steps in embodiment 2, on the basis of embodiment 2, further referring to fig. 5-10 in the specification, the side wall of the box body 1 is provided with an adjusting groove 3 for installing the adjuster 4, the adjuster 4 comprises a conductive cross bar 6 installed along the length direction of the adjusting groove 3, the conductive cross bar 6 is alternately provided with conductive segments 61 and insulating segments 62, and the branch line 7 is electrically connected with the conductive segments 61; a sleeve contact 41 is slidably connected to the conductive beam 6. The provision of the sleeve contact 41 sliding along the conductive beam 6 and the provision of the conductive beam 6 as a conductive segment 61 and an insulating segment 62 can improve the ease of adjusting the length of the participating heating resistance wire 5. The purpose of setting the length of the bushing contact 41 to be greater than the length of the insulating segment 62 is to ensure that the bushing contact 41 can effectively contact with at least one conductive segment 61 to conduct electricity no matter where the bushing contact 41 is located on the conductive cross bar 6, so as to change the length of the effective resistance wire 5 participating in heating.

In this embodiment, the electric heating baking unit includes two sets of resistance wires 5 which are arranged in a reciprocating parallel folding manner and are respectively installed on the inner side walls of the left side and the right side of the box body 1, the number of the conductive cross rods 6 is two, each folding loop of the two sets of resistance wires 5 is electrically connected with the conductive sections 61 arranged on the two conductive cross rods 6 through branch lines 7, and the two sleeve contacts 41 arranged on the regulator 4 are electrically connected with each other through trunk lines 8 and are respectively connected on the two conductive cross rods 6 in a sliding manner. The purpose of adopting the above arrangement is that two groups of resistance wires 5 positioned on the side walls of the oven at two sides can be adjusted simultaneously through one adjuster 4. Similarly, if the resistance wires 5 are arranged on the upper side wall, the lower side wall, the left side wall and the right side wall, the regulators 4 can be respectively arranged on the two side walls of the box body 1 according to the scheme. Of course, the number of the resistance wires 5 is determined according to the working environment or the heating efficiency requirement of the box body 1, and the implementation of the technical scheme is not affected.

In this embodiment, two locking devices for fixing the box back door 12 on the inner wall of the box body 1 are oppositely arranged on the box back door 12, each locking device comprises a locking handle 13 hinged on the box back door 12, the end of the locking handle 13 is integrated or fixedly connected with an eccentric wheel 15, and an elastic anti-skid device 14 is arranged between the eccentric wheel 15 and the inner wall of the box body 1. The working principle of the locker is as follows: when the locking handle 13 of the locker is opened, namely the locking handle 13 keeps a vertical angle with the box back door 12, the distance between the hinge point of the eccentric wheel 15 and the surface of the anti-skid device 14 and the eccentric wheel 15 is minimum, so that the mutual abutting internal stress between the eccentric wheel 15 and the anti-skid device 14 does not exist; when the position of the rear cabinet door 12 needs to be fixed after the rear cabinet door 12 is adjusted before baking, the locking handle 13 is rotated and pressed, so that the direction of the locking handle 13 is flush with the direction of the rear cabinet door 12. At this time, the distance between the pivot point of the eccentric 15 and the surface of the anti-skid device 14 is the largest with respect to the eccentric 15, so that the eccentric 15 exerts a positive thrust on the anti-skid device 14 to abut the anti-skid device 14 only against the inner wall of the box body 1, thereby achieving the purpose of relatively fixing the box back door 12 and the box body 1. Because the locker is arranged oppositely, the locking force applied to the box back door 12 is relatively balanced, and the stability of the box back door can be further ensured. Further, since the oven is mainly used for providing a specified high temperature for baking, the baking pressure inside the oven is not high, and the rear door 12 is not subjected to a significant internal pressure, so that it is completely feasible to improve the stability of the rear door 12 by a positive pressure. The antiskid unit 14 is made of a hard material capable of transmitting positive pressure, and a high-temperature-resistant silica gel antiskid material is arranged near the end of the inner wall of the oven. Of course, in the inventive concept of the present embodiment, other anti-slip materials can be used, which are not listed here.

In this embodiment, each of the folding loops of the resistance wires 5 is fixedly connected with a heat-conducting fin 9, and the heat-conducting fins 9 are fixedly connected with the inner side wall of the oven 1. The heat conduction fins 9, the resistance wires 5 and the inner wall of the box body 1 are connected, so that the heat conduction efficiency and the heat transfer uniformity can be effectively improved. The heat-conducting fins 9 are arranged in a rectangular, rhombic or triangular cross manner, and can be made of copper, stainless steel or high-heat-conductivity existing alloy materials.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (6)

1. The utility model provides a variable volume laboratory oven, includes box (1), articulates case qianmen (2) on box (1), installs electric heat in box (1) toasts the unit, and is used for adjusting and control temperature controller (10) that the electric heat toasted the unit and temperature sensor (11) of being connected with temperature controller (10) and with the temperature real-time sensing conveying of temperature in the oven to temperature controller (10), its characterized in that: the oven is characterized in that the oven body (1) is further connected with an oven rear door (12) used for adjusting the size of the baking inner cavity of the oven in a sliding and sealing mode, and an adjuster (4) used for adjusting the heating area of the electric heating baking unit is arranged on the side wall of the oven body (1).

2. A variable volume laboratory oven according to claim 1 wherein: the electric heating baking unit comprises at least one group of resistance wires (5) which are arranged in a reciprocating parallel folding manner, and each folding loop of the resistance wires (5) is electrically connected with the regulator (4) through a branch wire (7).

3. A variable volume laboratory oven according to claim 2 wherein: the side wall of the box body (1) is provided with an adjusting groove (3) for installing the adjuster (4), the adjuster (4) comprises a conductive cross rod (6) installed along the length direction of the adjusting groove (3), the conductive cross rod (6) is alternately provided with conductive segments (61) and insulating segments (62), and the branch line (7) is electrically connected with the conductive segments (61); the conductive cross rod (6) is connected with a sleeve contact (41) in a sliding mode, and the length of the sleeve contact (41) is larger than that of the insulating section (62).

4. A variable volume laboratory oven according to claim 3 wherein: the electric heating baking unit comprises two groups of resistance wires (5) which are arranged in a reciprocating parallel folding mode and are respectively arranged on the inner side walls of the left side and the right side of the box body (1), the number of the conductive cross rods (6) is two, two groups of folding loops of each resistance wire (5) are respectively connected with two conductive sections (61) arranged on the conductive cross rods (6) in an electric mode through branch wires (7), and sleeve contacts (41) arranged on the regulator (4) are two and are electrically connected through a trunk wire (8) and are respectively connected with the two conductive cross rods (6) in a sliding mode.

5. A variable volume laboratory oven according to any of claims 2 to 4 wherein: and each folding loop of the resistance wire (5) is fixedly connected with a heat-conducting fin (9), and the heat-conducting fins (9) are fixedly connected with the inner side wall of the box body (1).

6. A variable volume laboratory oven according to any of claims 1 to 4 wherein: the box back door (12) is provided with two lockers relatively, the lockers are used for fixing the box back door (12) on the inner wall of the box body (1), the lockers comprise locking handles (13) hinged on the box back door (12), the ends of the locking handles (13) are integrated or fixedly connected with eccentric wheels (15), and elastic anti-skidding devices (14) are installed between the eccentric wheels (15) and the inner wall of the box body (1).

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