CN114623249B - Method and device for adjusting ventilation rate of thermal oxidation aging box - Google Patents
Method and device for adjusting ventilation rate of thermal oxidation aging box Download PDFInfo
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- 238000009423 ventilation Methods 0.000 title claims abstract description 187
- 230000032683 aging Effects 0.000 title claims abstract description 100
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 54
- 230000003647 oxidation Effects 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 36
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- 238000012360 testing method Methods 0.000 abstract description 14
- 239000000463 material Substances 0.000 abstract description 9
- 230000008859 change Effects 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 4
- 239000002861 polymer material Substances 0.000 description 4
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
- F16K1/38—Valve members of conical shape
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/50—Mechanical actuating means with screw-spindle or internally threaded actuating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/002—Test chambers
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Abstract
The invention relates to the technical field of material tests, and discloses a method and a device for adjusting the ventilation rate of a thermal oxidation aging oven, wherein the method for adjusting the ventilation rate of the thermal oxidation aging oven comprises the following steps: setting a target ventilation rate; acquiring the volume of a thermal oxidation aging box; closing a scavenging valve to obtain the power of the thermal oxidation aging box at the moment; opening a ventilation valve to a preset opening degree to obtain the power of the thermal oxidation aging box at the moment; acquiring the temperature of the center position of the thermo-oxidative aging box; acquiring the air temperature and the air density at the air inlet of the thermal oxidation aging box; calculating the actual ventilation rate by utilizing a formula, comparing the actual ventilation rate with the target ventilation rate, and reducing the opening of the ventilation valve if the actual ventilation rate is greater than the target ventilation rate; if the actual ventilation rate is smaller than the target ventilation rate, the opening degree of the ventilation valve is increased. Therefore, the actual ventilation rate of the thermal oxidation aging box is automatically adjusted, the target ventilation rate can be more approached, the accuracy of aging test is improved, and the labor cost is reduced.
Description
Technical Field
The invention relates to the technical field of material tests, in particular to a method and a device for adjusting the ventilation rate of a thermal oxidation aging box.
Background
When the high molecular material is affected by environmental factors, the high molecular material is gradually degraded and finally fails. Therefore, the method has great significance for evaluating the weather resistance of the high polymer material.
In the prior art, accelerated aging of a high polymer material to evaluate the weather resistance of the high polymer material appears, and a thermal oxidative aging test is common equipment for artificially aging the high polymer material. In the thermal oxidation aging test, key parameters affecting aging mainly include temperature and air exchange rate, wherein the air exchange rate has a larger influence on the thermal oxidation aging performance evaluation of the material, but the air exchange rate can change along with the ambient temperature and air density, so that the actual air exchange rate and the target air exchange rate deviate to a certain extent, and the aging test result of the thermal oxidation aging box is affected to a certain extent, so that stable adjustment of the air exchange rate is quite important.
Currently, ventilation rates are typically manually adjusted, which requires a significant amount of effort and is not necessarily accurate. Firstly, the ventilation rate is related to the ambient temperature and the air density, and the ambient temperature and the air density are changed at any time, so that the manual adjustment of the ventilation rate is difficult to keep up with the real-time change of the environment, and the accuracy is affected; secondly, the ventilation rate is generally difficult to adjust in place in one step, and needs to be adjusted repeatedly and repeatedly until the ventilation rate reaches the target value, so that the operation is complex, the time is long, and the input workload is large; thirdly, the period of the thermal oxidation aging box aging test is longer, and the environmental temperature is changed due to the factors such as season alternation or the change of the running state of peripheral equipment in the testing process, so that the ventilation rate is also required to be adjusted periodically by manpower, and the workload is high.
Disclosure of Invention
The purpose of the invention is that: provided are a method and an apparatus for adjusting the ventilation rate of a thermal oxidation aging chamber, which can automatically adjust the ventilation rate.
In order to achieve the above purpose, the invention provides a method for adjusting the ventilation rate of a thermo-oxidative aging oven, comprising the following steps:
setting a target ventilation rate N;
acquiring the volume V of a thermal oxidation aging box;
closingThe scavenging valve acquires the power P of the thermal oxidation aging box at the moment 1 ；
Opening a ventilation valve to a preset opening degree to obtain the power P of the thermal oxidation aging box at the moment 2 ；
Obtaining the temperature T of the central position of the thermo-oxidative aging box 1 ；
Obtaining the air temperature T at the air inlet of the thermo-oxidative aging box 2 ；
Acquiring the air density rho at the air inlet of the thermo-oxidative aging box;
the actual ventilation rate N' is calculated using the formula as follows:
comparing the actual ventilation rate N 'with the target ventilation rate N, and if N' is larger than N, reducing the opening of the ventilation valve; if N' is smaller than N, the opening degree of the gas exchange valve is increased.
Further, the method also comprises the following steps:
repeating acquisition of P 2 、T 1 、T 2 And ρ, repeatedly calculating an actual ventilation rate N ', and reducing or increasing the opening of the ventilation valve according to the actual ventilation rate N' and the target ventilation rate N.
Further, the method also comprises the following steps:
setting an error value S;
and (3) repeatedly calculating the actual ventilation rate N 'by using a formula to reduce or increase the opening of the ventilation valve until the absolute value of N' -N is less than or equal to S.
Further, the method also comprises the following steps:
periodically obtaining P when |N' -N|is less than or equal to S 2 、T 1 、T 2 And ρ and calculating an actual ventilation rate N 'to calculate a value of |n' -n|;
if the absolute value of N' -N is less than or equal to S, continuously and periodically acquiring the P 2 、T 1 、T 2 And ρ and calculating an actual ventilation rate N 'to calculate a value of |n' -n|;
if the absolute value of the ventilation rate N '-N is larger than the absolute value of the ventilation valve S, the opening of the ventilation valve is reduced or increased again according to the actual ventilation rate N' and the target ventilation rate N, and the actual ventilation rate N 'is calculated by repeatedly utilizing a formula to reduce or increase the opening of the ventilation valve until the absolute value of the ventilation rate N' -N is smaller than or equal to the absolute value of the ventilation valve S.
Further, the method also comprises the following steps:
presetting a relation diagram between the density and the temperature of air in an atmospheric environment;
the step of obtaining the air density rho at the air inlet of the thermo-oxidative aging box comprises the following steps: according to the air temperature T at the air inlet of the thermo-oxidative aging box 2 And obtaining the air density rho at the air inlet of the thermal oxidation aging box from the relation diagram.
Further, the air exchange valve comprises a base and a valve core; the base has a ventilation chamber, an inlet in communication with the ventilation chamber, and an outlet in communication with the ventilation chamber for communication with the inlet of the thermo-oxidative aging box; the valve core is in a truncated cone shape or a cone shape, the axis of the valve core is coincident with the axis of the inlet, the valve core is provided with a first part positioned in the ventilation cavity and a second part extending to the outside of the base through the inlet, and the bottom surface of the valve core is positioned in the first part.
Further, a chute extending along the axial direction of the inlet is arranged on the inner wall of the ventilation chamber; the air exchange valve further comprises a support, the valve core is supported on the support, and the support is arranged in the sliding groove in a sliding mode.
Further, the driving mechanism includes a screw rod connected to the valve core and extending in an axial direction of the inlet, a driving gear engaged with the screw rod, and a driving motor connected to the driving gear.
Further, the device also comprises a seat body; the seat body is arranged on one side of the air exchange valve, an air exchange channel communicated with the air exchange valve is formed in the seat body, and the cross-sectional area of the air exchange channel is twice or more than that of the air exchange valve inlet.
Compared with the prior art, the ventilation rate adjusting method for the thermo-oxidative aging oven has the beneficial effects that:
in the embodiment of the invention, when the ventilation rate of the thermal oxidation aging box is adjusted, the target ventilation rate N is firstly generated manually or automatically, then the ventilation valve is closed, and the power P required by the thermal oxidation aging box to heat the air at a certain rate is measured 1 Then, the scavenging valve is opened to a preset opening degree, and the power P required by the thermal oxidation aging box for heating the air at a certain speed is measured 2 The method comprises the steps of carrying out a first treatment on the surface of the Then, the actual ventilation rate N' is calculated according to the formula, and the opening degree of the ventilation valve is adjusted.
When the opening of the scavenging valve is changed, the actual scavenging rate N' is changed, and can be calculated according to the formula; wherein, after the opening degree of the scavenging valve is adjusted, the ventilation quantity is firstly influenced, the ventilation quantity is increased along with the opening of the scavenging valve and is reduced along with the closing of the scavenging valve, and then the power P required by the thermal oxidation aging box for heating the air at a certain speed is simultaneously generated 2 Changes in (i) formula P 2 The above formula is thus adapted to the calculation of the actual ventilation rate N' after the change of the opening of the ventilation valve.
Through the scheme, the actual ventilation rate of the thermal oxidation aging box is automatically adjusted, the target ventilation rate can be more approached, the accuracy of aging test is improved, and the labor cost is reduced.
In order to achieve the above object, an embodiment of the present invention further provides a ventilation rate adjusting device for a thermo-oxidative aging oven, including:
the scavenging valve is arranged at the air inlet of the thermal oxidation aging box;
the storage module is used for storing the target ventilation rate N and the volume V of the thermo-oxidative aging box;
the power acquisition module is used for acquiring the power P of the thermo-oxidative aging box when the scavenging valve is closed 1 And recording the power P of the thermo-oxidative aging box when the air exchange valve is opened to a preset opening degree 2 ；
The temperature acquisition module is used for acquiring the temperature T of the gravity center position of the thermo-oxidative aging box 1 And the air temperature T at the air inlet of the thermo-oxidative aging box 2 ；
The density acquisition module is used for acquiring the air density rho at the air inlet of the thermo-oxidative aging box;
the calculation module is used for calculating the actual ventilation rate N' according to the following formula:
and
The opening adjusting module is used for adjusting the opening of the ventilation valve according to the actual ventilation rate N' and the target ventilation rate N; if N' is larger than N, reducing the opening of the scavenging valve; if N' is smaller than N, the opening degree of the gas exchange valve is increased.
Drawings
FIG. 1 is a flow chart of a method for adjusting the ventilation rate of a thermal oxidation chamber according to an embodiment of the invention.
Fig. 2 is a block diagram of a thermal oxidation chamber ventilation rate adjusting apparatus according to an embodiment of the present invention.
Fig. 3 is a block diagram of an opening degree adjusting module of the ventilation rate adjusting device of the thermal oxidation aging oven according to the embodiment of the present invention.
In the figure, 1, a gas exchange valve; 11. a base; 111. a ventilation chamber; 112. an inlet; 113. a chute; 12. a valve core; 13. a bracket; 2. an opening degree adjusting module; 21. a driving motor; 22. a screw; 23. and a drive gear.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
As shown in fig. 1, a method for adjusting the ventilation rate of a thermal oxidation aging oven according to a preferred embodiment of the present invention includes the following steps: setting a target ventilation rate N; acquiring the volume V of a thermal oxidation aging box; closing the scavenging valve 1 to obtain the power P of the thermal oxidation aging box at the moment 1 The method comprises the steps of carrying out a first treatment on the surface of the Air exchanging valve1 is opened to a preset opening degree to obtain the power P of the thermal oxidation aging box at the moment 2 The method comprises the steps of carrying out a first treatment on the surface of the Obtaining the temperature T of the central position of the thermo-oxidative aging box 1 The method comprises the steps of carrying out a first treatment on the surface of the Obtaining the air temperature T at the air inlet of the thermo-oxidative aging box 2 The method comprises the steps of carrying out a first treatment on the surface of the Acquiring the air density rho at the air inlet of the thermo-oxidative aging box; the actual ventilation rate N' is calculated using the formula as follows:
comparing the actual ventilation rate N 'with the target ventilation rate N, and if N' is larger than N, reducing the opening of the ventilation valve 1; if N' is smaller than N, the opening degree of the gas exchange valve 1 is increased.
Wherein the ventilation rate of the thermo-oxidative aging oven should not change with the change of the external environment, so that the actual ventilation rate needs to be adjusted towards the target ventilation rate when the adjustment is performed.
Wherein P is 1 Representing the power of the thermal oxidation ageing oven when the thermal oxidation ageing oven does not perform ventilation, namely heating materials; p (P) 2 Representing that the thermal oxidation aging box works when ventilation is carried out, namely heating materials and power for heating gas entering the thermal oxidation aging box; obviously P 2 Increases with increasing ventilation rate and decreases with decreasing ventilation rate.
Wherein the above formula is an empirical formula. In the formula, P 1 And P 2 Is W and V is dm 3 ，T 1 And T 2 Units of (c) are in degrees Celsius and units of ρ are in kg/dm 3 。
Based on the above scheme, when the speed of the thermal oxidation aging box is adjusted, the target ventilation speed N is firstly generated manually or automatically, then the ventilation valve 1 is closed, and the power P required by the thermal oxidation aging box to heat air at a certain speed is measured 1 Then, the scavenging valve 1 is opened to a preset opening degree, and the power P required by the thermal oxidation aging box for heating the air at a certain speed is measured 2 The method comprises the steps of carrying out a first treatment on the surface of the Then, the actual ventilation rate N' is calculated according to the formula, and the opening degree of the ventilation valve 1 is adjusted.
When the gas exchange valve 1After the opening is changed, the actual ventilation rate N 'is changed, and the actual ventilation rate N' can be calculated according to the formula; wherein, after the opening degree of the gas exchange valve 1 is adjusted, the first influence is the ventilation amount, the ventilation amount increases along with the opening of the gas exchange valve 1, and decreases along with the closing of the gas exchange valve 1, and the power P required by the thermo-oxidative aging box to heat the air at a certain speed simultaneously is the following 2 Changes in (i) formula P 2 The above formula is thus adapted to the calculation of the actual ventilation rate N' after a change in the opening of the ventilation valve 1.
Through the scheme, the actual ventilation rate of the thermal oxidation aging box is automatically adjusted, the target ventilation rate can be more approached, the accuracy of aging test is improved, and the labor cost is reduced.
Further, in some embodiments, the method further comprises the steps of: repeating acquisition of P 2 、T 1 、T 2 And rho, repeatedly calculating the actual ventilation rate N ', and reducing or increasing the opening of the ventilation valve according to the actual ventilation rate N' and the target ventilation rate N; by adjusting the opening degree of the ventilation valve a plurality of times, the accuracy is gradually improved compared to a method of directly adjusting the actual ventilation rate to the target ventilation rate in one step. Preferably, when the opening degree of the ventilation valve is reduced or increased, the change value of the opening degree of the ventilation valve is adjusted according to the difference between the actual ventilation rate N 'and the target ventilation rate N, and the larger the difference between the actual ventilation rate N' and the target ventilation rate N is, the larger the change of the opening degree of the ventilation valve is, so that higher accuracy can be achieved as much as possible on the premise of reducing the number of times of repeatedly adjusting the opening degree of the ventilation valve.
Further, in some embodiments, referring to fig. 1, the method further includes the following steps: setting an error value S; and (3) repeatedly calculating the actual ventilation rate N 'by using a formula to reduce or increase the opening of the ventilation valve 1 until the absolute value of N' -N is less than or equal to S.
The magnitude of the error value S is an allowable deviation value.
According to the method, the actual ventilation rate is enabled to be closer to the target ventilation rate along with the adjustment through repeated iterative adjustment of the actual ventilation rate, and the accuracy of the test result can be ensured as much as possible.
Further, in some embodiments, referring to fig. 1, the method further includes the following steps: periodically obtaining P when |N' -N|is less than or equal to S 2 、T 1 、T 2 And ρ and calculating an actual ventilation rate N 'to calculate a value of |n' -n|; if the absolute value of N' -N is less than or equal to S, continuously and periodically acquiring the P 2 、T 1 、T 2 And ρ and calculating an actual ventilation rate N 'to calculate a value of |n' -n|; if |N' -N|>S, reducing or increasing the opening of the scavenging valve 1 again according to the actual scavenging rate N ' and the target scavenging rate N, and repeatedly calculating the actual scavenging rate N ' by using a formula to reduce or increase the opening of the scavenging valve 1 until the absolute value of N ' -N is less than or equal to S.
The embodiment enables the ventilation rate adjusting method of the thermal oxidation aging oven to be suitable for long-time aging tests, and specifically comprises the following steps:
when the absolute value of N' -N is less than or equal to S, the initial regulation is finished; but in the long-term use process, the air temperature T at the air inlet of the thermo-oxidative aging box 2 And the air density ρ at the inlet of the thermo-oxidative aging chamber, when recalculated |N' -N|>S, comparing the actual ventilation rate N 'with the target ventilation rate N again, and if N' is larger than N, reducing the opening of the ventilation valve 1; if N 'is smaller than N, the opening of the gas exchange valve 1 is increased until |N' -N| is less than or equal to S.
In the embodiment, compared with a continuous acquisition mode, the periodic acquisition mode is more energy-saving; on the other hand, the actual ventilation rate can be ensured to be adaptively changed according to environmental changes, so that the test can be performed for a long time.
Further, in some embodiments, referring to fig. 1, the method further includes the following steps: presetting a relation diagram between the density and the temperature of air in an atmospheric environment; the step of obtaining the air density rho at the air inlet of the thermo-oxidative aging box comprises the following steps: according to the air temperature T at the air inlet of the thermo-oxidative aging box 2 And obtaining the air density rho at the air inlet of the thermal oxidation aging box from the relation diagram.
In the present embodiment, the total calculation amount is reduced by presetting the relationship between the density and the temperature of the air in the atmospheric environment, and the calculation cost can be reduced.
Further, in some embodiments, referring to fig. 2 to 3, the gas exchange valve 1 includes a base 11 and a valve core 12; the base 11 has a ventilation chamber 111, an inlet 112 in communication with the ventilation chamber 111, and an outlet in communication with the ventilation chamber 111 for communication with the inlet of the thermo-oxidative aging box; the valve core 12 is in a truncated cone shape or a conical shape, the axis of the valve core 12 is coincident with the axis of the inlet 112, the valve core 12 has a first part positioned in the ventilation chamber 111 and a second part extending to the outside of the base 11 through the inlet 112, and the bottom surface of the valve core 12 is positioned in the first part.
In the present embodiment, when supplying air to the thermo-oxidation chamber, air enters the ventilation chamber 111 through the inlet 112, and enters the air inlet of the thermo-oxidation chamber through the outlet to enter the thermo-oxidation chamber. During this time, as the drive mechanism drives the valve spool 12 away from or toward the inlet 112, the area between the edge of the inlet 112 and the valve spool 12 increases or decreases, thereby regulating the ventilation rate.
Further, in some embodiments, referring to fig. 2 to 3, a chute 113 extending along the axial direction of the inlet 112 is provided on the inner wall of the ventilation chamber 111; the ventilation valve 1 further comprises a support 13, the valve core 12 is supported on the support 13, and the support 13 is slidably arranged in the sliding groove 113.
In the present embodiment, the sliding groove 113 and the bracket 13 are provided, so that the movement track of the valve core 12 is determined, and the intake air amount can be stably adjusted, thereby regulating and controlling the ventilation rate.
Further, referring to fig. 2 to 3, in some embodiments, the driving mechanism includes a screw 22 connected to the valve core 12 and extending along the axial direction of the inlet 112, a driving gear 23 meshed with the screw 22, and a driving motor 21 connected to the driving gear 23, and the screw 22 is driven smoothly and can effectively drive the valve core 12 to translate.
Further, in some embodiments, referring to fig. 2 to 3, the device further includes a base; the seat body is arranged on one side of the ventilation valve 1, a ventilation channel communicated with the ventilation valve 1 is formed in the seat body, and the cross-sectional area of the ventilation channel is twice or more than that of an inlet 112 of the ventilation valve 1, so that the maximum air inflow is ensured to meet the regulation requirement of the ventilation rate.
Referring to fig. 2 to 3, a ventilation rate adjusting device for a thermal oxidation aging oven according to a preferred embodiment of the present invention includes a ventilation valve 1, a storage module, a power obtaining module, a temperature obtaining module, a density obtaining module, a calculating module, and an opening adjusting module 2; the storage module is used for storing the target ventilation rate N and the volume V of the thermo-oxidative aging box; the power acquisition module is used for acquiring the power P of the thermo-oxidative aging box when the gas exchange valve 1 is closed 1 And recording the power P of the thermo-oxidative aging chamber when the ventilation valve 1 is opened to a predetermined opening degree 2 The method comprises the steps of carrying out a first treatment on the surface of the The temperature acquisition module is used for acquiring the temperature T of the gravity center position of the thermo-oxidative aging box 1 And the air temperature T at the air inlet of the thermo-oxidative aging box 2 The method comprises the steps of carrying out a first treatment on the surface of the The density acquisition module is used for acquiring the air density rho at the air inlet of the thermo-oxidative aging box; the calculation module is used for calculating the actual ventilation rate N' according to the following formula:
the opening adjusting module 2 is used for adjusting the opening of the ventilation valve 1 according to the actual ventilation rate N' and the target ventilation rate N; if N' is larger than N, the opening of the scavenging valve 1 is reduced; if N' is smaller than N, the opening of the scavenging valve 1 is increased; the opening degree adjustment module 2 includes a driving mechanism that drives the valve element 12 to move in the axial direction of the inlet 112.
Based on the scheme, the actual ventilation rate of the thermal oxidation aging box is automatically adjusted, the thermal oxidation aging box can be more close to the target ventilation rate, the accuracy of aging test is improved, and the labor cost is reduced.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (4)
1. The method for adjusting the ventilation rate of the thermo-oxidative aging oven is characterized by comprising the following steps of:
setting a target ventilation rate N;
acquiring the volume V of a thermal oxidation aging box;
closing a gas exchange valve arranged at a gas inlet of the thermal oxidation aging box to obtain the power P of the thermal oxidation aging box at the moment 1 ；
Opening a ventilation valve to a preset opening degree to obtain the power P of the thermal oxidation aging box at the moment 2 ；
Obtaining the temperature T of the central position of the thermo-oxidative aging box 1 ；
Obtaining the air temperature T at the air inlet of the thermo-oxidative aging box 2 ；
Acquiring the air density rho at the air inlet of the thermo-oxidative aging box; presetting a relation diagram between the density and the temperature of air in an atmospheric environment; the step of obtaining the air density rho at the air inlet of the thermo-oxidative aging box comprises the following steps: according to the air temperature T at the air inlet of the thermo-oxidative aging box 2 Obtaining the air density rho at the air inlet of the thermal oxidation aging box from the relation diagram;
the actual ventilation rate N' is calculated using the formula as follows:
comparing the actual ventilation rate N 'with the target ventilation rate N, and if N' is larger than N, reducing the opening of the ventilation valve; if N' is smaller than N, increasing the opening of the scavenging valve;
repeating acquisition of P 2 、T 1 、T 2 And rho, repeatedly calculating the actual ventilation rate N ', and reducing or increasing the opening of the ventilation valve according to the actual ventilation rate N' and the target ventilation rate N;
setting an error value S;
repeatedly calculating the actual ventilation rate N 'by using a formula to reduce or increase the opening of the ventilation valve until the absolute value of N' -N is less than or equal to S;
periodically obtaining P when |N' -N|is less than or equal to S 2 、T 1 、T 2 And ρ and calculating an actual ventilation rate N 'to calculate a value of |n' -n|;
if the absolute value of N' -N is less than or equal to S, continuously and periodically acquiring P 2 、T 1 、T 2 And ρ and calculating an actual ventilation rate N 'to calculate a value of |n' -n|;
if the absolute value of the ventilation rate N '-N is larger than the absolute value of the ventilation valve S, the opening of the ventilation valve is reduced or increased again according to the actual ventilation rate N' and the target ventilation rate N, and the actual ventilation rate N 'is calculated by repeatedly utilizing a formula to reduce or increase the opening of the ventilation valve until the absolute value of the ventilation rate N' -N is smaller than or equal to the absolute value of the ventilation valve S.
2. The method of claim 1, wherein the ventilation valve comprises a base and a valve core;
the base has a ventilation chamber, an inlet in communication with the ventilation chamber, and an outlet in communication with the ventilation chamber for communication with the inlet of the thermo-oxidative aging box;
the valve core is in a truncated cone shape or a cone shape, the axis of the valve core is coincident with the axis of the inlet, the valve core is provided with a first part positioned in the ventilation cavity and a second part extending to the outside of the base through the inlet, and the bottom surface of the valve core is positioned in the first part.
3. The method for adjusting the ventilation rate of the thermal oxidation aging oven according to claim 2, wherein a chute extending along the axial direction of the inlet is provided on the inner wall of the ventilation chamber;
the air exchange valve further comprises a support, the valve core is supported on the support, and the support is arranged in the sliding groove in a sliding mode.
4. The method for adjusting the ventilation rate of a thermo-oxidative aging oven according to claim 3, wherein the ventilation valve further comprises a seat body; the seat body is arranged on one side of the air exchange valve, an air exchange channel communicated with the air exchange valve is formed in the seat body, and the cross-sectional area of the air exchange channel is twice or more than that of the air exchange valve inlet.
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