Sealing device for normal-pressure thermal test threading hole and normal-pressure thermal test system

Abstract

The invention provides a sealing device for a normal-pressure thermal test threading hole and a normal-pressure thermal test system, and relates to the technical field of test equipment, the sealing device comprises an inner sealing baffle plate, a sealing plug, an outer sealing baffle plate and a cable pressing device, the sealing plug is inserted into the threading hole, the inner sealing baffle plate and the outer sealing baffle plate are respectively installed on the inner side wall and the outer side wall of a normal-pressure thermal test box, and the cable pressing device is arranged on the inner side wall and the outer side wall of the normal-pressure thermal test box. The cable pressing device is arranged on the outer side of the cable bundle in a sleeving mode and used for bundling the cable bundle in a bundle mode. The test cable is sealed layer by layer in four modes, the sealing effect is good, and convection of gas inside and outside the box can be effectively prevented. And the device is simple in structure and can be quickly mounted and dismounted. The device is provided with multiple dimensions, can be applied to various threading hole dimensions, and can be reused after being disassembled, so that the waste of test materials is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of test equipment, and in particular to a sealing device for a normal pressure thermal test threading hole and a normal pressure thermal test system. Background Art

[0002] When a spacecraft product is subjected to a normal pressure heat test, it is required to test the test product. It is necessary to lead the test cable from the test box through the threading hole on the side of the box to connect it to the test equipment outside the box, and then seal the threading hole. The existing sealing method is rubber plug + absorbent cotton + plastic film sealing method. This method uses a relatively hard material, and the test hole is prone to gaps, which causes the test hole to leak cold and frost. The sealing reliability is poor and the sealing process is cumbersome, affecting the efficiency of the test preparation process. Therefore, how to effectively seal the threading holes to meet the sealing problems of various cable threading holes for a variety of test products has become an urgent problem to be solved in this field. Summary of the invention

[0003] The present invention provides a sealing device for a normal pressure thermal test threading hole and a normal pressure thermal test system, which are used to solve the defects in the prior art that the test hole is prone to gaps, the test hole leaks cold and frosts, the sealing reliability is poor and the sealing process is cumbersome, which affects the efficiency of the test preparation process.

[0004] On the one hand, the present invention provides a sealing device for a normal pressure thermal test wire threading hole, which is installed at the wire threading hole of a normal pressure thermal test box, and includes: an inner sealing baffle, a sealing plug, an outer sealing baffle and a cable clamping device, the sealing plug is inserted into the wire threading hole, the inner sealing baffle and the outer sealing baffle are respectively installed on the inner and outer side walls of the normal pressure thermal test box, the cable clamping device is mounted on the outside of the cable bundle, and the cable clamping device is used to bundle the cable bundles.

[0005] Preferably, the inner sealing baffle and the outer sealing baffle have the same structure. The inner sealing baffle is a circular plate body with a wire passing groove formed on the circular end surface and a plurality of fastening holes evenly distributed on the circular end surface.

[0006] Preferably, the inner sealing baffle is composed of a polytetrafluoroethylene layer and an aerogel layer, and the polytetrafluoroethylene layer and the aerogel layer are bonded by silica gel.

[0007] Preferably, the sealing plug is a tapered cylinder made of rubber material, the inner surface diameter of the sealing plug is smaller than the outer surface diameter, and a wire hole is provided on the sealing plug.

[0008] Preferably, the cable clamping device includes a clamp and a sealing gasket, the sealing gasket is arranged on the inner ring of the clamp, and the sealing gasket is composed of three layers of material: polyimide, silicone foam and aerogel.

[0009] The present invention also provides a normal pressure thermal test system, including a sealing device for a normal pressure thermal test threading hole, and further comprising:

[0010] A test chamber, used to accommodate the components to be tested;

[0011] An air handling module, used to circulate, filter and regulate the air in the test chamber;

[0012] A humidity control module is connected to the test chamber and is used to control the humidity in the test chamber;

[0013] The control system is electrically connected to the air processing module and the humidity control module, and is used to control the operation of the air processing module and the humidity control module.

[0014] Preferably, the air treatment module comprises:

[0015] Air circulation pipeline, used to realize the circulation of air in the test chamber;

[0016] A refrigeration module is arranged inside the air circulation pipeline and is used to cool the air in the air circulation pipeline;

[0017] The heating module is arranged inside the air circulation pipeline and is used to heat the air in the air circulation pipeline.

[0018] Preferably, the humidity control module comprises:

[0019] Air pressure sensor, used to detect the actual air pressure inside the test chamber;

[0020] Temperature sensor, used to detect the actual temperature inside the test chamber;

[0021] Humidity sensor, used to detect the relative humidity inside the test chamber;

[0022] A nitrogen storage unit for storing pure nitrogen;

[0023] A nitrogen pretreatment unit is used to preheat or precool the nitrogen before it enters the test chamber;

[0024] The flow control module is used to adjust the nitrogen flow rate entering the test chamber.

[0025] Preferably, the flow control unit comprises:

[0026] A target value calculation subunit is used to calculate the target value of the nitrogen inlet flow rate;

[0027]

[0028] T m =2T S -T S-1 ;in, is the target value of nitrogen inflow flow rate; is the saturated water vapor pressure corresponding to the actual temperature in the test chamber; Y s is the actual relative humidity in the test chamber; V X is the volume of the test chamber; R is the ideal gas constant; T S is the actual temperature in the test chamber; Y is the saturated water vapor pressure corresponding to the predicted temperature of the test cabin after unit time; m is the target relative humidity in the preset test chamber; T m is the predicted temperature in the test chamber after a unit time; Y is the saturated water vapor pressure corresponding to the actual temperature of the air injected into the test chamber through the air circulation pipeline; q The actual relative humidity of the air injected into the test chamber by the air circulation pipeline; Q q is the flow rate of air injected into the test chamber by the air circulation pipeline; t0 is the unit time; T q The actual temperature of the air injected into the test chamber by the air circulation pipeline; is the molar mass of water; is the density of nitrogen; T S-1 is the actual temperature in the test chamber unit time ago;

[0029] A flow rate regulating subunit, used for regulating the inlet flow rate of nitrogen to a target value of the inlet flow rate of nitrogen;

[0030] The humidity monitoring subunit is used to monitor the relative humidity inside the test chamber and issue an alarm when the relative humidity reaches a dangerous threshold.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The present invention adopts four methods to seal the test cable layer by layer, and the sealing effect is good, which can effectively prevent the convection of gas inside and outside the box. In addition, the device has a simple structure and can be quickly installed and disassembled, minimizing the time for preliminary preparation. The device can be applied to a variety of threading hole sizes by setting multiple size specifications. The device can be reused after disassembly, which is different from the original sealing method that requires the consumption of disposable test materials such as cotton wool, tape, and plastic film, thereby reducing the waste of test materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a schematic diagram of the structure of the present invention;

[0035] Figure 2 It is a structural schematic diagram of the inner sealing baffle of the present invention;

[0036] Figure 3 It is a schematic structural diagram of the sealing plug of the present invention;

[0037] Figure 4 It is a structural schematic diagram of the cable compression device of the present invention.

[0038] Reference numerals:

[0039] 1. Normal pressure heat test chamber; 2. Inner sealing baffle; 201. Wire groove; 202. Fastening hole; 3. Sealing plug; 301. Wire hole; 4. Outer sealing baffle; 5. Cable clamping device; 501. Clamp; 6. Cable bundle. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0042] Example 1

[0043] An embodiment of the present invention provides a sealing device for a normal pressure thermal test wire threading hole, which is installed at the wire threading hole of a normal pressure thermal test box 1, and includes: an inner sealing baffle 2, a sealing plug 3, an outer sealing baffle 4 and a cable clamping device 5, the sealing plug 3 is inserted into the wire threading hole, the inner sealing baffle 2 and the outer sealing baffle 4 are respectively installed on the inner and outer side walls of the normal pressure thermal test box 1, the cable clamping device 5 is mounted on the outside of the cable bundle 6, and the cable clamping device 5 is used to bundle the cable bundle 6.

[0044] Preferably, the inner sealing baffle 2 and the outer sealing baffle 4 have the same structure. The inner sealing baffle 2 is a circular plate body with a wire groove 201 formed on the circular end surface and a plurality of fastening holes 202 evenly distributed on the circular end surface.

[0045] Preferably, the inner sealing baffle 2 is composed of a polytetrafluoroethylene layer and an aerogel layer, and the polytetrafluoroethylene layer and the aerogel layer are bonded by silica gel.

[0046] Preferably, the sealing plug 3 is a conical cylinder made of rubber material, the inner surface diameter of the sealing plug 3 is smaller than the outer surface diameter, and a wire hole 301 is provided on the sealing plug 3.

[0047] Preferably, the cable clamping device 5 comprises a clamp 501 and a sealing gasket, wherein the sealing gasket is arranged on the inner ring of the clamp 501, and the sealing gasket is composed of three layers of materials: polyimide, silicone foam and aerogel.

[0048] In this embodiment, the inner sealing baffle 2, the sealing plug 3, the outer sealing baffle 4 and the cable pressing device 5 are all provided with several different sizes.

[0049] The beneficial effects of the above technical solution are:

[0050] When conducting a normal pressure heat test, the test cable is connected to the product to be tested, and then the cable bundle 6 is passed through the threading hole. First, the inner sealing baffle 2 is tightened with bolts on one side inside the normal pressure heat test box 1 to a degree that the cable bundle 6 does not deform. Then the cable bundle 6 is adjusted into a bundle and placed at the bottom of the threading hole. Then the sealing plug 3 is inserted into the threading hole, and the cable bundle 6 is located in the threading hole 301. Then, the outer sealing baffle 4 is tightened with bolts on one side outside the normal pressure heat test box 1 to a degree that the cable bundle 6 does not deform. The cable bundle 6 outside the normal pressure heat test box 1 is clamped again with the cable clamping device 5, and a sealing gasket is used between the clamp 501 and the cable bundle 6 to protect the cable bundle 6 and seal the remaining gap.

[0051] The present invention adopts four methods to seal the test cable layer by layer, and the sealing effect is good, which can effectively prevent the convection of gas inside and outside the box. In addition, the device has a simple structure and can be quickly installed and disassembled, minimizing the time for preliminary preparation. The device can be applied to a variety of threading hole sizes by setting multiple size specifications. The device can be reused after disassembly, which is different from the original sealing method that requires the consumption of disposable test materials such as cotton wool, tape, and plastic film, thereby reducing the waste of test materials.

[0052] Example 2

[0053] The embodiment of the present invention provides a normal pressure thermal test system, including a sealing device for a normal pressure thermal test threading hole as described in Embodiment 1, and further comprising:

[0054] A test chamber, used to accommodate the components to be tested;

[0055] An air handling module, used to circulate, filter and regulate the air in the test chamber;

[0056] A humidity control module is connected to the test chamber and is used to control the humidity in the test chamber;

[0057] The control system is electrically connected to the air processing module and the humidity control module, and is used to control the operation of the air processing module and the humidity control module.

[0058] Preferably, the air treatment module comprises:

[0059] Air circulation pipeline, used to realize the circulation of air in the test chamber;

[0060] A refrigeration module is arranged inside the air circulation pipeline and is used to cool the air in the air circulation pipeline;

[0061] The heating module is arranged inside the air circulation pipeline and is used to heat the air in the air circulation pipeline.

[0062] Preferably, the humidity control module comprises:

[0063] Air pressure sensor, used to detect the actual air pressure inside the test chamber;

[0064] Temperature sensor, used to detect the actual temperature inside the test chamber;

[0065] Humidity sensor, used to detect the relative humidity inside the test chamber;

[0066] A nitrogen storage unit for storing pure nitrogen;

[0067] A nitrogen pretreatment unit is used to preheat or precool the nitrogen before it enters the test chamber;

[0068] The flow control module is used to adjust the nitrogen flow rate entering the test chamber.

[0069] Preferably, the flow control unit comprises:

[0070] A target value calculation subunit is used to calculate the target value of the nitrogen inlet flow rate;

[0071]

[0072] T m =2T S -T S-1 ;in, is the target value of nitrogen inflow flow rate; is the saturated water vapor pressure corresponding to the actual temperature in the test chamber; Y s is the actual relative humidity in the test chamber; V X is the volume of the test chamber; R is the ideal gas constant; T S is the actual temperature in the test chamber; Y is the saturated water vapor pressure corresponding to the predicted temperature of the test cabin after unit time; m is the target relative humidity in the preset test chamber; T m is the predicted temperature in the test chamber after a unit time; Y is the saturated water vapor pressure corresponding to the actual temperature of the air injected into the test chamber through the air circulation pipeline; q The actual relative humidity of the air injected into the test chamber by the air circulation pipeline; Q q is the flow rate of air injected into the test chamber by the air circulation pipeline; t0 is the unit time; T q The actual temperature of the air injected into the test chamber by the air circulation pipeline; is the molar mass of water; is the density of nitrogen; T S-1 is the actual temperature in the test chamber unit time ago;

[0073] A flow rate regulating subunit, used for regulating the inlet flow rate of nitrogen to a target value of the inlet flow rate of nitrogen;

[0074] The humidity monitoring subunit is used to monitor the relative humidity inside the test chamber and issue an alarm when the relative humidity reaches a dangerous threshold.

[0075] The beneficial effects of the above technical solution are:

[0076] By setting up an air treatment module to circulate, filter and adjust the air in the test chamber, the excellent quality of the air in the test chamber and the high uniformity of the temperature are maintained. By setting up a refrigeration module and a heating module, the circulating air is heated or cooled, thereby realizing the adjustment of the temperature in the test chamber. By setting up a humidity control module, the relative humidity in the test chamber is adjusted in real time, ensuring the stability of the relative humidity in the test chamber, reducing the volatility of the relative humidity in the test chamber, and thus improving the accuracy of the test results. By setting up a nitrogen pretreatment unit, the nitrogen is preheated or precooled before it is introduced into the test chamber, so that the temperature of the nitrogen is close to the temperature inside the test chamber, thereby reducing the influence of the nitrogen on the temperature inside the test chamber and ensuring the stability of the temperature inside the test chamber.

[0077] The predicted temperature inside the test chamber after a unit of time is calculated using the data on the temperature change inside the test chamber, thereby ensuring the synchronization of nitrogen flow regulation and the temperature change inside the test chamber, improving the accuracy of humidity control, and further ensuring the stability of the humidity inside the test chamber.

[0078] By considering the amount of water vapor that needs to be replaced due to the humidity change caused by the temperature change inside the test chamber and the amount of excess water vapor brought in by the circulating air, the total amount of water vapor that needs to be replaced by nitrogen per unit time is obtained, and the target value of the nitrogen flow rate is calculated based on the total amount of water vapor, thereby ensuring the stability of the humidity inside the test chamber.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sealing device for a threading hole of a normal pressure thermal test, installed at the threading hole of a normal pressure thermal test box (1), characterized in that: include: An inner sealing baffle (2), a sealing plug (3), an outer sealing baffle (4) and a cable pressing device (5), wherein the sealing plug (3) is inserted into the wire threading hole, the inner sealing baffle (2) and the outer sealing baffle (4) are respectively installed on the inner and outer side walls of the normal pressure heat test box (1), and the cable pressing device (5) is sleeved on the outside of the cable bundle (6), and the cable pressing device (5) is used to bundle the cable bundle (6).

2. The sealing device for the threading hole of the normal pressure thermal test according to claim 1, characterized in that: The inner sealing baffle (2) and the outer sealing baffle (4) have the same structure. The inner sealing baffle (2) is a circular plate body, a wire passing groove (201) is provided on the circular end surface, and a plurality of fastening holes (202) are evenly distributed on the circular end surface.

3. The sealing device for the threading hole of the normal pressure thermal test according to claim 2, characterized in that: The inner sealing baffle (2) is composed of a polytetrafluoroethylene layer and an aerogel layer, and the polytetrafluoroethylene layer and the aerogel layer are bonded by silica gel.

4. The sealing device for a normal pressure thermal test threading hole according to claim 1, characterized in that: The sealing plug (3) is a conical cylinder made of rubber material. The inner surface diameter of the sealing plug (3) is smaller than the outer surface diameter. The sealing plug (3) is provided with a wire hole (301).

5. The sealing device for the threading hole of the normal pressure thermal test according to claim 1, characterized in that: The cable clamping device (5) comprises a clamp (501) and a sealing pad, wherein the sealing pad is arranged on the inner ring of the clamp (501), and the sealing pad is composed of three layers of material: polyimide, silicone foam and aerogel.

6. A normal pressure thermal test system, comprising a sealing device for a normal pressure thermal test threading hole according to any one of claims 1 to 5, characterized in that: Also includes: A test chamber, used to accommodate the components to be tested; An air handling module, used to circulate, filter and regulate the air in the test chamber; A humidity control module is connected to the test chamber and is used to control the humidity in the test chamber; The control system is electrically connected to the air processing module and the humidity control module, and is used to control the operation of the air processing module and the humidity control module.

7. A normal pressure thermal test system according to claim 6, characterized in that: The air handling module includes: Air circulation pipeline, used to realize the circulation of air in the test chamber; A refrigeration module is arranged inside the air circulation pipeline and is used to cool the air in the air circulation pipeline; The heating module is arranged inside the air circulation pipeline and is used to heat the air in the air circulation pipeline.

8. A normal pressure thermal test system according to claim 7, characterized in that: The humidity control module includes: Air pressure sensor, used to detect the actual air pressure inside the test chamber; Temperature sensor, used to detect the actual temperature inside the test chamber; Humidity sensor, used to detect the relative humidity inside the test chamber; A nitrogen storage unit for storing pure nitrogen; A nitrogen pretreatment unit is used to preheat or precool the nitrogen before it enters the test chamber; The flow control module is used to adjust the nitrogen flow rate entering the test chamber.

9. A normal pressure thermal test system according to claim 8, characterized in that: The flow control unit includes: A target value calculation subunit is used to calculate the target value of the nitrogen inlet flow rate; T m =2T S -T S-1 ;in, is the target value of nitrogen inflow flow rate; is the saturated water vapor pressure corresponding to the actual temperature in the test chamber; Y s is the actual relative humidity in the test chamber; V X is the volume of the test chamber; R is the ideal gas constant; T S is the actual temperature in the test chamber; Y is the saturated water vapor pressure corresponding to the predicted temperature of the test cabin after unit time; m is the target relative humidity in the preset test chamber; T m is the predicted temperature in the test chamber after a unit time; Y is the saturated water vapor pressure corresponding to the actual temperature of the air injected into the test chamber through the air circulation pipeline; q The actual relative humidity of the air injected into the test chamber by the air circulation pipeline; Q q is the flow rate of air injected into the test chamber by the air circulation pipeline; t0 is the unit time; T q The actual temperature of the air injected into the test chamber by the air circulation pipeline; is the molar mass of water; is the density of nitrogen; T S-1 is the actual temperature in the test chamber unit time ago; A flow rate regulating subunit, used for regulating the inlet flow rate of nitrogen to a target value of the inlet flow rate of nitrogen; The humidity monitoring subunit is used to monitor the relative humidity inside the test chamber and issue an alarm when the relative humidity reaches a dangerous threshold.

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