High-temperature-resistant optical endoscope integrating thermal protection and pollutant purging functions

Abstract

The invention discloses a high-temperature-resistant optical endoscope integrating thermal protection and pollutant purging functions, and relates to the technical field of optical endoscopes, an endoscope main body comprises an endoscope front end part, an endoscope middle part and an endoscope rear end part from front to back, and the endoscope main body comprises an inner layer sleeve and an outer layer sleeve; an optical imaging module and an optical machine assembly module are mounted on the inner side of the inner-layer sleeve; a thermal protection and pollutant purging module is arranged between the inner-layer sleeve and the outer-layer sleeve and comprises a cooling gas channel, a cooling liquid inflow channel and a cooling liquid backflow channel, a cooling gas inlet channel and a cooling gas outlet channel are formed in the two ends of the cooling gas channel, a cooling liquid inlet channel is formed in one end of the cooling liquid inflow channel, and a cooling liquid outlet channel is formed in the other end of the cooling liquid backflow channel; a cooling liquid outlet channel is arranged at one end of the cooling liquid backflow channel, and the cooling liquid inflow channel is communicated with the end, located at the front end of the endoscope, of the cooling liquid backflow channel. According to the endoscope cooling device, efficient cooling and pollutant purging of the endoscope can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of optical endoscopes, and in particular to a high-temperature resistant optical endoscope that integrates thermal protection and pollutant purging functions. Background Art

[0002] As an industrial monitoring device, optical endoscopes have been widely used in aerospace, metal smelting, and non-destructive testing due to their advantages of high imaging clarity, good portability, and little damage to the monitored objects. In the above-mentioned application fields, endoscopes may face harsh environments with high temperatures and high pollution. Taking typical industrial steelmaking furnaces and aircraft engine turbine components as examples, the temperature of commonly used industrial steelmaking furnaces exceeds 1600°C, while the temperature before the turbine of the fourth-generation turbofan engine reaches about 1700°C, and both working environments contain a large amount of particulate pollutants generated by combustion. In such high-temperature and high-pollution environments, excessively high temperatures may cause thermal deformation of optical components, affect the quality of optical imaging, and even exceed the upper temperature limit of optical components or mechanical structures, causing failure and damage to optical endoscopes. Particulate pollutants may be deposited on the surface of optical components, affecting optical imaging, and even corroding and damaging optical components. Therefore, developing an optical endoscope with thermal protection and purge functions to achieve effective protection of the optical endoscope in high temperature and high pollution environments is of great significance for the normal use of the optical endoscope in harsh environments such as high temperature and high pollution.

[0003] Existing ordinary industrial optical endoscopes generally lack cooling and pollutant purge devices, and the maximum operating temperature does not exceed 300°C, making them difficult to use in high-temperature and high-pollution environments. Some high-temperature resistant optical endoscopes use cooling devices that contain cooling air or cooling water, which can provide certain cooling and pollutant purge functions. However, due to the unreasonable design of the cooling and purge structure, there are problems such as low upper temperature resistance limit and insufficient anti-pollution ability, which in turn leads to significant restrictions on the application of existing optical endoscopes in high-temperature and high-pollution environments.

[0004] Therefore, there is an urgent need in the art for a high temperature resistant optical endoscope that integrates thermal protection and contaminant purging functions to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a high-temperature resistant optical endoscope with integrated thermal protection and contaminant purge functions to solve the problems existing in the above-mentioned prior art. A thermal protection and contaminant purge module is provided to cool the overall structure of the endoscope to ensure that it operates within a safe temperature range. At the same time, the optical imaging components are purged to avoid impurities adhering to and interfering with the imaging, so that the endoscope can still clearly image the observation area in a high temperature and high pollution environment.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention discloses a high temperature resistant optical endoscope with integrated thermal protection and pollutant purging functions, comprising an endoscope body, wherein the endoscope body comprises, from front to back, an endoscope front end portion, an endoscope middle portion and an endoscope rear end portion, the endoscope body comprises an inner sleeve and an outer sleeve, an optical imaging module and an optical-mechanical assembly module are installed on the inner side of the inner sleeve, and the optical-mechanical assembly module is used to fix the optical imaging module;

[0008] A heat protection and contaminant purge module is provided between the inner sleeve and the outer sleeve, and the heat protection and contaminant purge module includes a cooling air channel, a cooling liquid inflow channel and a cooling liquid return channel. A cooling air inlet channel and a cooling air outlet channel are provided at both ends of the cooling air channel, respectively. The cooling air inlet channel is provided at the rear end of the endoscope, and the cooling air outlet channel is provided at the front end of the endoscope. Cooling air is introduced from the cooling air inlet channel and blown out from the cooling air outlet channel, and the blown cooling air can be blown to the front of the endoscope. The end portion of the endoscope is purged, one end of the cooling liquid inlet channel is provided with a cooling liquid inlet channel, the cooling liquid inlet channel is arranged at the rear end portion of the endoscope, the other end of the cooling liquid inlet channel is located at the front end portion of the endoscope, one end of the cooling liquid return channel is provided with a cooling liquid outlet channel, the cooling liquid outlet channel is arranged at the rear end portion of the endoscope, the other end of the cooling liquid return channel is located at the front end portion of the endoscope, the cooling liquid inlet channel and the cooling liquid return channel are communicated with one end of the cooling liquid return channel located at the front end portion of the endoscope.

[0009] Preferably, a liquid-liquid barrier layer and a gas-liquid barrier layer are further provided between the inner sleeve and the outer sleeve, the cooling gas channel is provided between the gas-liquid barrier layer and the inner sleeve, the cooling liquid inflow channel is provided between the gas-liquid barrier layer and the liquid-liquid barrier layer, and the cooling liquid return channel is provided between the liquid-liquid barrier layer and the outer sleeve;

[0010] A threaded mounting ring is connected between the front end of the outer sleeve and the front end of the gas-liquid barrier layer. A coolant turning channel is formed between the threaded mounting ring, the outer sleeve, the liquid-liquid barrier layer and the gas-liquid barrier layer. The coolant inflow channel and the coolant return channel are connected through the coolant turning channel.

[0011] Preferably, the outer sleeve, the liquid-liquid barrier and the gas-liquid barrier are all smooth round straight tubes;

[0012] The liquid-liquid barrier and the gas-liquid barrier are made of stainless steel;

[0013] The outer sleeve is made of stainless steel or nickel-based alloy.

[0014] Preferably, the inner sleeve comprises an objective lens sleeve, an optical extension sleeve assembly and an optical fixing sleeve which are sequentially connected from front to back, wherein the optical extension sleeve assembly comprises a plurality of optical extension sleeves which are sequentially connected end to end;

[0015] The front end of the objective lens sleeve is threadedly connected with a prism seat;

[0016] The outer side of the objective lens sleeve is provided with supporting ribs, and the supporting ribs abut against the inner side of the gas-liquid barrier.

[0017] Preferably, an outer flange is provided on the outer sleeve located at the rear end of the endoscope, and a coolant outlet end structure, a coolant inlet end structure and a coolant air inlet end structure are sequentially connected to the rear end of the outer flange, the coolant air inlet channel is provided on the coolant air inlet end structure, the coolant inlet channel is provided on the coolant inlet end structure, and the coolant outlet channel is provided on the coolant outlet end structure;

[0018] An optical sleeve gland is threadedly connected to the cooling air inlet end structure, and the optical sleeve gland is used to abut against the rear end of the optical fixed sleeve;

[0019] A mounting gasket is provided between the rear end of the cooling air inlet end structure and the optical fixing sleeve;

[0020] The outer sleeve is also provided with an interface shell, and the interface shell is located outside the coolant outlet end structure, the coolant inlet end structure and the cooling gas inlet end structure.

[0021] Preferably, a threaded end cap is provided on the outer side of the prism seat, and a cooling air turning channel is provided on the inner side between the outer side of the prism seat and the threaded end cap;

[0022] The threaded end cover is provided with a plurality of air film cooling holes, and the air film cooling holes are circular through holes.

[0023] Preferably, a heat radiation suppression layer is provided on the outer side wall of the threaded end cap, and the heat radiation suppression layer is made of gold or platinum.

[0024] Preferably, the optical imaging module comprises a right-angle prism, a first convex lens, a second convex lens, a first concave lens, a third convex lens, a first relay lens, a second relay lens, a third relay lens and a fourth relay lens;

[0025] Wherein, the right-angle prism is installed in the prism seat, the prism seat is provided with an observation port, and the incident surface of the right-angle prism is located at the observation port;

[0026] The first convex lens, the second convex lens, the first concave lens and the third convex lens are sequentially arranged in the objective lens sleeve from front to back, and the second convex lens and the first concave lens are bonded and fixed;

[0027] The first relay lens, the second relay lens, the third relay lens and the fourth relay lens are sequentially arranged from front to back in the optical extension sleeve assembly located at the middle part of the endoscope;

[0028] Optical axes of the first convex lens, the second convex lens, the first concave lens, the third convex lens, the first relay lens, the second relay lens, the third relay lens, and the fourth relay lens are coaxially arranged.

[0029] Preferably, a square groove is provided in the right-angle prism, a prism pad and the right-angle prism are installed in the square groove, and an inclined surface of the prism pad is in contact with an inclined surface of the right-angle prism.

[0030] Preferably, the optical-mechanical assembly module comprises a prism pressure ring, a first lens top ring, a second lens top ring and a plurality of lens pressure rings;

[0031] The prism pressing ring is installed in the installation groove of the prism seat, the front end of the prism pressing ring is against the right-angle prism, and the rear end of the prism pressing ring is against the front end of the objective lens sleeve;

[0032] The first lens top ring is installed in the objective lens sleeve, the front end of the first lens top ring abuts against the first convex lens, and the rear end of the first lens top ring abuts against the second convex lens;

[0033] The second lens top ring is installed in the objective lens sleeve, the front end of the second lens top ring abuts against the first concave lens, and the rear end of the second lens top ring abuts against the third convex lens;

[0034] A lens pressing ring is provided at the rear end of the third convex lens, the front and rear ends of the first relay lens, the front and rear ends of the second relay lens, the front and rear ends of the third relay lens, and the front and rear ends of the fourth relay lens.

[0035] Compared with the prior art, the present invention has achieved the following technical effects:

[0036] Advantage 1. High upper temperature limit (about 1700℃): The present invention is provided with a cooling air channel, a cooling liquid inflow channel and a cooling liquid return channel. The cooling of the endoscope body is achieved through the integrated design of the double-layer liquid cooling channel and the single-layer air cooling channel, which fully utilizes the cooling capacity of the cooling air and the cooling liquid, and solves the problems of low cooling medium utilization efficiency and insufficient thermal protection capacity in the existing technical solutions using independent air cooling or liquid cooling. It can effectively improve the high temperature resistance of the endoscope body, so that the endoscope body can still clearly image the observation area even in a high temperature environment.

[0037] Advantage 2: Good anti-pollution effect: The present invention adopts a single-layer air-cooling channel design that integrates thermal protection and purging functions, which fully utilizes the purging function of the cooling air on the optical imaging module at the front end of the endoscope, thereby solving the problem in the prior art that pollutants and impurities can be prevented from depositing on the optical components at the front end of the endoscope, and can ensure that the endoscope can clearly image the area to be observed in a highly polluted environment.

[0038] Advantage three: The working outer diameter of the endoscope body is relatively small (≯30mm): The present invention adopts a smooth straight tube cooling channel design, combined with the miniaturized and compact design of optical components and mechanical components, to maintain a relatively small working outer diameter of the endoscope body, solving the problem in the prior art that the endoscope has a large outer diameter and is difficult to work in a small space, thereby ensuring its applicability in a small space.

[0039] Advantage 4: The liquid cooling channel is not prone to clogging by impurities: The present invention adopts a smooth straight tube design with a small flow resistance in the cooling channel, which solves the problem that the liquid cooling channel is easily clogged by impurities in the coolant due to the complex structure of the threaded groove and the small flow area in the existing technical solution using a threaded groove liquid cooling channel. It reduces the risk of clogging of the coolant inlet channel and the coolant return channel in the endoscope body, reduces the frequency of disassembly and cleaning of the coolant inlet channel and the coolant return channel, and improves the safety and efficiency of the endoscope body during long-term operation.

[0040] Advantage 5: Modular design is adopted, and each component can be disassembled and replaced separately, which is easy to maintain: All structures of the present invention adopt modular design, which solves the defects that the components of existing endoscopes are difficult to disassemble and maintain, and facilitates the disassembly and replacement of each component, and facilitates the maintenance of the endoscope body. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only 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.

[0042] Figure 1 An overall schematic diagram of a high temperature resistant optical endoscope integrating thermal protection and contaminant purging functions according to an embodiment of the present invention;

[0043] Figure 2 A cross-sectional view of an optical imaging module and an optical-mechanical assembly module in a high-temperature resistant optical endoscope integrating thermal protection and contaminant purging functions according to an embodiment of the present invention;

[0044] Figure 3 An internal cross-sectional view of a high temperature resistant optical endoscope integrating thermal protection and contaminant purging functions according to an embodiment of the present invention;

[0045] Figure 4 for Figure 3 A partial enlarged view of the AA part;

[0046] Figure 5 for Figure 3 A partial enlarged view of the BB part;

[0047] Figure 6 for Figure 3 A partial enlarged view of the CC part;

[0048] Figure 7 for Figure 6 A cross-sectional view of the EE portion;

[0049] In the figure: 1-rear end of the endoscope; 2-middle end of the endoscope; 3-front end of the endoscope; 01-cooling air channel; 02-cooling liquid inflow channel; 03-cooling liquid return channel; 011-cooling air inlet channel; 012-cooling air turning channel; 013-cooling air outlet channel; 021-cooling liquid inlet channel; 022-cooling liquid turning channel; 031-cooling liquid outlet channel; 101-cooling liquid outlet end structure; 102-cooling liquid inlet end structure; 103-cooling air inlet end structure; 104-outer flange; 105-outer sleeve; 106-liquid-liquid barrier; 107-gas-liquid barrier; 108-optical extension sleeve Components; 109-optical fixing sleeve; 110-optical sleeve pressure cover; 111-mounting gasket; 112-interface housing; 201-first relay lens; 202-second relay lens; 203-third relay lens; 204-fourth relay lens; 205-lens pressure ring; 301-threaded end cap; 302-prism seat; 303-prism gasket; 304-right angle prism; 305-prism pressure ring; 306-threaded mounting ring; 307-first convex lens; 308-first lens top ring; 309-second convex lens; 310-first concave lens; 311-second lens top ring; 312-third convex lens; 313-objective sleeve. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0051] The purpose of the present invention is to provide a high-temperature resistant optical endoscope with integrated thermal protection and contaminant purge functions to solve the problems existing in the above-mentioned prior art. A thermal protection and contaminant purge module is provided to cool the overall structure of the endoscope to ensure that it operates within a safe temperature range. At the same time, the optical imaging components are purged to avoid impurities adhering to and interfering with the imaging, so that the endoscope can still clearly image the observation area in a high temperature and high pollution environment.

[0052] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0053] like Figure 1-Figure 7 As shown, the present invention provides a high temperature resistant optical endoscope with integrated thermal protection and pollutant purging functions, including an endoscope body, the endoscope body is sequentially composed of an endoscope front end portion 3, an endoscope middle portion 2 and an endoscope rear end portion 1 from front to back, the endoscope front end portion 3, the endoscope middle portion 2 and the endoscope rear end portion 1 are three parts of the endoscope body, and there is a common structure and a unique structure between these three parts. From the perspective of the internal and external levels, the endoscope body includes an inner sleeve and an outer sleeve 105, and an optical imaging module and an optical-mechanical component module are installed on the inner side of the inner sleeve. The optical imaging module is used to realize imaging, and the staff can intuitively see the detected visual image through the optical imaging module. Of course, if the visual image needs to be transmitted to the background computer (it should be noted that it is not set in this embodiment), some additional visual processing modules need to be added, including but not limited to image sensors or cameras and other devices, and the visual processing module can be connected to the background computer through wires. Of course, these belong to the prior art, so they are not repeated here, and the optical-mechanical component module is used to fix the optical imaging module.

[0054] Among them, the rear end portion 1 of the endoscope is outside the high temperature area during actual use, and a visual processing module may be installed if necessary to realize image reception, processing and transmission; the middle portion 2 of the endoscope is within the high temperature area during actual use, and is used to form a transmission optical path to realize the transmission of the image formed by the optical imaging module, carry the optical imaging module and assist the thermal protection and contaminant purge module to form a cooling medium channel, and at the same time transport cooling gas and cooling liquid to perform thermal protection on the endoscope body; the front end portion 3 of the endoscope is within the high temperature area during actual use, and is used to form an imaging optical path to image the surface to be observed, carry the optical imaging module and assist the thermal protection and contaminant purge module to form a cooling medium channel, and at the same time transport cooling gas and cooling liquid to perform thermal protection on the front end structure of the endoscope.

[0055] A heat protection and pollutant purge module is provided between the inner sleeve and the outer sleeve 105, and the heat protection and pollutant purge module includes a cooling air channel 01, a cooling liquid inflow channel 02 and a cooling liquid return channel 03 which are arranged in sequence from the inside to the outside. A cooling air inlet channel 011 and a cooling air outlet channel 013 are provided at both ends of the cooling air channel 01, respectively. The cooling air inlet channel 011 is arranged on the rear end portion 1 of the endoscope, and the cooling air outlet channel 013 is arranged on the front end portion 3 of the endoscope. Cooling air enters from the cooling air inlet channel 011 and is blown out from the cooling air outlet channel 013, and the blown cooling air can purge the front end portion 3 of the endoscope. A cooling liquid inlet channel 021 is provided at one end of the cooling liquid inflow channel 02, and the cooling liquid inlet channel 021 is arranged on the rear end portion 1 of the endoscope, and the other end of the cooling liquid inflow channel 02 is located at the front end portion 3 of the endoscope. A cooling liquid outlet channel 031 is provided at one end of the cooling liquid reflux channel 03, and the cooling liquid outlet channel 031 is arranged on the rear end portion 1 of the endoscope. The other end of the cooling liquid reflux channel 03 is located at the front end portion 3 of the endoscope. The cooling liquid inflow channel 02 is connected to one end of the cooling liquid reflux channel 03 located on the front end portion 3 of the endoscope.

[0056] In actual use, the cooling gas channel 01 is the innermost cooling medium heat exchange channel, which is used to transmit cooling gas as the cooling medium of the endoscope body. Its rear end is connected to the cooling gas inlet channel 011, and its front end is connected to the cooling gas outlet channel 013. Specifically, the cooling gas enters the cooling gas channel 01 through the cooling gas inlet channel 011, is transmitted through the cooling gas channel 01 and passes through the rear end portion 1, the middle portion 2 and the front end portion 3 of the endoscope in sequence, and is finally ejected from the cooling gas outlet channel 013 and leaves the endoscope body. It should be particularly noted that the cooling gas can sweep the impurities in the front end portion 3 of the endoscope when it is blown out, and at the same time, due to the positive pressure of the cooling gas, it is difficult for external impurities to adhere to the front end portion 3 of the endoscope. The cooling liquid inflow channel 02 and the cooling liquid return channel 03 are respectively the middle layer and the outermost layer cooling medium heat exchange channels, both of which are used to transmit cooling liquid as the cooling medium of the endoscope body. The rear end of the cooling liquid inflow channel 02 is connected to the cooling liquid inlet channel 021, and its front end is connected to the front end of the cooling liquid return channel 03. The rear end of the cooling liquid return channel 03 is connected to the cooling liquid outlet channel 031. Specifically, the cooling liquid enters the cooling liquid inflow channel 02 through the cooling liquid inlet channel 021, and passes through the cooling liquid inflow channel 0 2 is transmitted and passes through the endoscope rear end portion 1, the endoscope middle portion 2 and the endoscope front end portion 3 in sequence, then turns at the endoscope front end portion 3 and enters the cooling liquid reflux channel 03, then is transmitted through the cooling liquid reflux channel 03 and passes through the endoscope front end portion 3, the endoscope middle portion 2 and the endoscope rear end portion 1 in sequence, and finally leaves the endoscope body through the cooling liquid outlet channel 031. Through the dual thermal protection of cooling gas and cooling liquid, it can ensure that the endoscope body can still operate normally even in a high-temperature working environment.

[0057] In this embodiment, a liquid-liquid barrier layer 106 and a gas-liquid barrier layer 107 are further provided between the inner sleeve and the outer sleeve 105. Both the liquid-liquid barrier layer 106 and the gas-liquid barrier layer 107 are circular tube structures. The cooling air channel 01 is between the gas-liquid barrier layer 107 and the inner sleeve, the cooling liquid inflow channel 02 is between the gas-liquid barrier layer 107 and the liquid-liquid barrier layer 106, and the cooling liquid return channel 03 is between the liquid-liquid barrier layer 106 and the outer sleeve 105.

[0058] like Figure 6As shown, a threaded mounting ring 306 is connected between the front end of the outer sleeve 105 and the front end of the gas-liquid barrier layer 107, and a coolant turning channel 022 is formed between the threaded mounting ring 306, the outer sleeve 105, the liquid-liquid barrier layer 106 and the gas-liquid barrier layer 107. The coolant inlet channel 02 and the coolant return channel 03 are connected through the coolant turning channel 022, and the coolant from the coolant inlet channel 02 makes a 180° turn in the coolant turning channel 022 and then flows into the coolant return channel 03.

[0059] For the cooling gas, after the cooling gas enters the rear end portion 1 of the endoscope from the cooling gas inlet channel 011, a cylindrical flow occurs on the outside of the inner sleeve, and then flows forward through the cooling gas channel 01 to enter the middle portion 2 and the front end portion 3 of the endoscope; for the cooling liquid, after the cooling liquid enters the rear end portion 1 of the endoscope from the cooling liquid inlet channel 021, a cylindrical flow occurs on the outside of the gas-liquid barrier 107, and then flows forward through the cooling liquid inlet channel 02 to flow into the middle portion 2 and the front end portion 3 of the endoscope. After flowing in the middle portion 2 and the front end portion 3 of the endoscope, the cooling liquid undergoes a 180° turn in the overall flow direction in the cooling liquid turning channel 022, flows from the front end portion 3 of the endoscope into the cooling liquid reflux channel 03 and flows backward along the cooling liquid reflux channel 03, and finally flows out of the endoscope body through the cooling liquid outlet channel 031.

[0060] In this embodiment, the outer sleeve 105, the liquid-liquid barrier 106 and the gas-liquid barrier 107 are all common smooth round straight tubes.

[0061] The working temperature of the liquid-liquid barrier 106 and the gas-liquid barrier 107 is not higher than 300° C., and the material is a common alloy material with low cost, specifically stainless steel.

[0062] The material of the outer sleeve 105 can be selected from common alloy materials or high-temperature alloy materials according to the actual application environment temperature, specifically stainless steel or nickel-based alloy.

[0063] In this embodiment, the inner sleeve includes an objective lens sleeve 313, an optical extension sleeve assembly 108 and an optical fixed sleeve 109 which are connected in sequence from front to back, wherein the optical extension sleeve assembly 108 further includes a plurality of optical extension sleeves which are connected in sequence end to end, and the connection between two adjacent pipes is a threaded connection.

[0064] In addition, the front end of the objective lens sleeve 313 is threadedly connected to a prism seat 302 , and the prism seat 302 is provided with an observation port for collecting images.

[0065] The objective lens sleeve 313 is provided with six supporting ribs along the circumferential direction, and the outer side of the supporting ribs abuts against the inner side of the gas-liquid barrier 107, so as to realize the support and positioning between the objective lens sleeve 313 and the gas-liquid barrier 107, and at the same time rectify the cooling gas in the cooling gas channel 01, so that the flow of the cooling gas in the front end structure of the endoscope is more stable.

[0066] In this embodiment, if Figure 4 As shown, the outer sleeve 105 located at the rear end portion 1 of the endoscope is provided with an outer flange 104, and the rear end of the outer flange 104 is sequentially connected to a coolant outlet end structure 101, a coolant inlet end structure 102 and a cooling air inlet end structure 103, the cooling air inlet channel 011 is provided on the cooling air inlet end structure 103, the cooling liquid inlet channel 021 is provided on the cooling liquid inlet end structure 102, and the cooling liquid outlet channel 031 is provided on the cooling liquid outlet end structure 101.

[0067] Specifically, the coolant outlet end structure 101, the coolant inlet end structure 102 and the cooling air inlet end structure 103 are all provided with flange structures, and the coolant outlet end structure 101, the coolant inlet end structure 102 and the cooling air inlet end structure 103 are connected and fixed by flanges in sequence from front to back. Of course, the outer flange 104 is also directly connected and fixed to the coolant outlet end structure 101 by the flange structure.

[0068] In addition, the rear edge of the liquid-liquid barrier 106 is welded and fixed to the rear edge of the coolant outlet end structure 101, and cooperates with the front edge of the coolant inlet end structure 102; the rear edge of the gas-liquid barrier 107 is welded and fixed to the rear edge of the coolant inlet end structure 102, and cooperates with the front edge of the cooling gas inlet end structure 103.

[0069] An optical sleeve gland 110 is threadedly connected to the cooling air inlet end structure 103 . The optical fixed sleeve 109 is located in the inner layer of the cooling air inlet end structure 103 . The optical sleeve gland 110 is used to abut against the rear end of the optical fixed sleeve 109 .

[0070] A mounting gasket 111 is provided between the rear end of the cooling air inlet end structure 103 and the optical fixing sleeve 109 . The mounting gasket 111 is located between the boss of the optical fixing sleeve 109 and the internal step of the cooling air inlet end structure 103 , and is used to assist in the installation, fixing and sealing of the optical fixing sleeve 109 .

[0071] In addition, an interface shell 112 is connected to the outer side of the rear end of the outer sleeve 105 by welding or threaded connection. The interface shell 112 is located outside the coolant outlet end structure 101, the coolant inlet end structure 102 and the cooling air inlet end structure 103, and is used to protect the coolant outlet end structure 101, the coolant inlet end structure 102 and the cooling air inlet end structure 103. And the coolant outlet channel 031, the coolant inlet channel 021 and the cooling air inlet channel 011 all pass through the interface shell 112, so as to facilitate their connection with adjacent pipe fittings.

[0072] In this embodiment, if Figure 6 As shown, a threaded end cap 301 is provided on the outer side of the prism seat 302, and a cooling gas turning channel 012 is provided on the inner side between the outer side of the prism seat 302 and the threaded end cap 301. In addition, a plurality of air film cooling holes are provided on the threaded end cap 301, and four air film cooling holes are specifically provided, and each of the air film cooling holes is a circular through hole. When the cooling gas flows in the cooling gas channel 01, a part of it will pass through the cooling gas turning channel 012 and flow out from the air film cooling holes on the threaded end cap 301, thereby strengthening the cooling of the threaded end cap 301 and forming a layer of air film at the front end portion 3 of the endoscope, thereby inhibiting the heat transfer from the external high temperature environment to the endoscope body, and realizing efficient thermal protection of the front end portion 3 of the endoscope; and the other part flows out from the air outlet on the prism seat 302, so that the observation port on the prism seat 302 can be purged, and positive pressure is also provided for it to prevent external impurities from entering the observation port.

[0073] In this embodiment, a heat radiation suppression layer is provided on the outer wall of the threaded end cap 301, and the heat radiation suppression layer is a metal coating, and the specific material of the heat radiation suppression layer is gold or platinum. The heat radiation suppression layer is made by a magnetron sputtering process, so as to play a role of high temperature resistance.

[0074] In this embodiment, the optical imaging module includes a right-angle prism 304 , a first convex lens 307 , a second convex lens 309 , a first concave lens 310 , a third convex lens 312 , a first relay lens 201 , a second relay lens 202 , a third relay lens 203 and a fourth relay lens 204 .

[0075] The right-angle prism 304 is installed in the prism seat 302 . The prism seat 302 is provided with a conical observation port. The incident surface of the right-angle prism 304 is located at the inner end of the observation port.

[0076] The first convex lens 307, the second convex lens 309, the first concave lens 310 and the third convex lens 312 are sequentially arranged in the objective lens sleeve 313 from front to back, and the first convex lens 307, the second convex lens 309, the first concave lens 310 and the third convex lens 312 are coaxially arranged. One transmission surface (i.e., the exit surface) of the right-angle prism 304 is perpendicular to the optical axes of the first convex lens 307, the second convex lens 309, the first concave lens 310 and the third convex lens 312, and the center of the transmission surface is located on the optical axes of the first convex lens 307, the second convex lens 309, the first concave lens 310 and the third convex lens 312, and the other transmission surface (i.e., the incident surface) of the right-angle prism 304 is parallel to the optical axes of the first convex lens 307, the second convex lens 309, the first concave lens 310 and the third convex lens 312. The adjacent surfaces of the second convex lens 309 and the first concave lens 310 match in shape and are fixed by bonding.

[0077] The first relay lens 201, the second relay lens 202, the third relay lens 203 and the fourth relay lens 204 are sequentially arranged from front to back in the optical extension sleeve assembly 108 located at the middle part 2 of the endoscope. The optical axes of the first convex lens 307, the second convex lens 309, the first concave lens 310, the third convex lens 312, the first relay lens 201, the second relay lens 202, the third relay lens 203 and the fourth relay lens 204 are coaxially arranged.

[0078] Specifically, after the light emitted from the surface to be observed is internally reflected on the reflection surface of the right-angle prism 304, it is reflected to the first convex lens 307, and after passing through the second convex lens 309, the first concave lens 310 and the third convex lens 312 in sequence, the image is formed on the image plane at the rear end of the third convex lens 312. The formed image is transmitted through the first relay lens 201, the second relay lens 202, the third relay lens 203 and the fourth relay lens 204 in sequence, and then reaches the rear end of the endoscope body, at which point the user can directly watch it. Of course, if the image needs to be transmitted to the background computer, a visual processing module, such as a camera or an image sensor, needs to be added to the rear end of the endoscope body.

[0079] In this embodiment, a square groove is provided in the right angle prism 304, and a prism pad 303 and the right angle prism 304 are installed in the square groove, and the inclined surface of the prism pad 303 is in contact with the inclined surface of the right angle prism 304. In order to ensure the cooling effect of the thermal protection and contaminant purge module on the right angle prism 304, preferably, thermal conductive silicone grease is filled in the gap between the right angle prism 304, the prism seat 302 and the prism pad 303.

[0080] In this embodiment, the optical-mechanical assembly module includes a prism clamping ring 305 , a first lens top ring 308 , a second lens top ring 311 and a plurality of lens clamping rings 205 .

[0081] Among them, the prism pressing ring 305 is installed in the installation groove in the prism seat 302, and the installation groove is a stepped circular hole. The front end of the prism pressing ring 305 is against the right-angle prism 304, and the rear end of the prism pressing ring 305 is against the front end of the objective lens sleeve 313. When the prism seat 302 and the objective lens sleeve 313 are fastened by threads, the objective lens sleeve 313 applies pressure to the prism pressing ring 305. The center hole of the prism pressing ring 305 is a circular hole, and the contact surface between the right-angle prism 304 and the prism pressing ring 305 is a square, so that the right-angle prism 304 can be fixed in the prism seat 302 through the prism pressing ring 305.

[0082] The first lens top ring 308 is installed on the corresponding step of the objective lens sleeve 313, the front end of the first lens top ring 308 is tangent to and abuts against the mirror surface of the first convex lens 307, and the rear end of the first lens top ring 308 is tangent to and abuts against the mirror surface of the second convex lens 309.

[0083] The second lens top ring 311 is installed on the corresponding step in the objective lens sleeve 313, the front end of the second lens top ring 311 is tangent to and abuts against the mirror surface of the first concave lens 310, and the rear end of the second lens top ring 311 is tangent to and abuts against the mirror surface of the third convex lens 312.

[0084] A lens pressing ring 205 is provided at the rear end of the third convex lens 312, the front and rear ends of the first relay lens 201, the front and rear ends of the second relay lens 202, the front and rear ends of the third relay lens 203, and the front and rear ends of the fourth relay lens 204 to fix the third convex lens 312, the first relay lens 201, the second relay lens 202, the third relay lens 203 and the fourth relay lens 204.

[0085] To facilitate understanding of the cooling medium flow channel structure in the front end portion 3 of the endoscope, as shown in FIG. Figure 7 As shown, the outer sleeve 105 and the liquid-liquid barrier layer 106 constitute the coolant return channel 03, the liquid-liquid barrier layer 106 and the gas-liquid barrier layer 107 constitute the coolant inflow channel 02, and the gas-liquid barrier layer 107 and the inner sleeve constitute the cooling gas channel 01.

[0086] In summary, the present invention provides a high-temperature resistant optical endoscope with integrated thermal protection and contaminant purge functions, comprising: an optical imaging module, an optomechanical component module and a thermal protection and contaminant purge module; the optical imaging module is used to image the observation area; the optomechanical component module is used to fix and carry optical elements, and cooperate with the thermal protection and contaminant purge module to form a transportation channel for the cooling medium; the thermal protection and contaminant purge module is used to cool the overall structure of the endoscope and purge the optical imaging module, so as to protect the optical imaging module from normal operation in a high temperature and high pollution environment.

[0087] The present invention realizes cooling and purging of the endoscope body through the integrated design of a double-layer liquid cooling channel and a single-layer air cooling channel, thereby effectively improving the high temperature resistance and anti-pollution performance of the endoscope body, so that it can still clearly image the observation area under high temperature and high pollution environment. In addition, by adopting a smooth straight tube cooling channel design, combined with the miniaturized and compact design of optical and mechanical components, the small working outer diameter of the endoscope body is maintained, thereby ensuring its applicability in a small space. Ultimately, while ensuring the small working outer diameter of the endoscope body, the upper limit of its working temperature resistance is effectively improved, solving the technical difficulty that small optical endoscopes are difficult to work normally in high temperature, high pollution, and small space environments. The endoscope body has the advantages of high upper temperature resistance, pollution resistance, small working outer diameter, liquid cooling channel is not prone to impurity clogging, and convenient disassembly and replacement.

[0088] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A high temperature resistant optical endoscope with integrated thermal protection and pollutant purge functions, characterized in that: The endoscope body comprises an endoscope front end portion (3), an endoscope middle portion (2) and an endoscope rear end portion (1) from front to back, the endoscope body comprises an inner sleeve and an outer sleeve (105), an optical imaging module and an optical-mechanical component module are installed on the inner side of the inner sleeve, and the optical-mechanical component module is used to fix the optical imaging module; A heat protection and contaminant purge module is provided between the inner sleeve and the outer sleeve (105), and the heat protection and contaminant purge module comprises a cooling air channel (01), a cooling liquid inflow channel (02) and a cooling liquid return channel (03). A cooling air inlet channel (011) and a cooling air outlet channel (013) are provided at both ends of the cooling air channel (01), respectively. The cooling air inlet channel (011) is provided at the rear end portion (1) of the endoscope, and the cooling air outlet channel (013) is provided at the front end portion (3) of the endoscope. Cooling air is introduced from the cooling air inlet channel (011) and blown out from the cooling air outlet channel (013), and the blown cooling air can cool the front end portion of the endoscope. (3) for purging, one end of the cooling liquid inlet channel (02) is provided with a cooling liquid inlet channel (021), and the cooling liquid inlet channel (021) is arranged on the rear end portion (1) of the endoscope, the other end of the cooling liquid inlet channel (02) is located at the front end portion (3) of the endoscope, one end of the cooling liquid return channel (03) is provided with a cooling liquid outlet channel (031), and the cooling liquid outlet channel (031) is arranged on the rear end portion (1) of the endoscope, the other end of the cooling liquid return channel (03) is located at the front end portion (3) of the endoscope, and the cooling liquid inlet channel (02) and the cooling liquid return channel (03) are connected at one end located at the front end portion (3) of the endoscope.

2. The high temperature resistant optical endoscope with integrated thermal protection and contaminant purge functions according to claim 1, characterized in that: A liquid-liquid barrier layer (106) and a gas-liquid barrier layer (107) are further provided between the inner sleeve and the outer sleeve (105); the cooling gas channel (01) is provided between the gas-liquid barrier layer (107) and the inner sleeve; the cooling liquid inflow channel (02) is provided between the gas-liquid barrier layer (107) and the liquid-liquid barrier layer (106); and the cooling liquid return channel (03) is provided between the liquid-liquid barrier layer (106) and the outer sleeve (105); A threaded mounting ring (306) is connected between the front end of the outer sleeve (105) and the front end of the gas-liquid barrier (107); a coolant turning channel (022) is formed between the threaded mounting ring (306), the outer sleeve (105), the liquid-liquid barrier (106) and the gas-liquid barrier (107); and the coolant inflow channel (02) and the coolant return channel (03) are connected via the coolant turning channel (022).

3. The high temperature resistant optical endoscope with integrated thermal protection and contaminant purge functions according to claim 2, characterized in that: The outer sleeve (105), the liquid-liquid barrier (106) and the gas-liquid barrier (107) are all smooth round straight tubes; The liquid-liquid barrier (106) and the gas-liquid barrier (107) are made of stainless steel; The outer sleeve (105) is made of stainless steel or nickel-based alloy.

4. The high temperature resistant optical endoscope with integrated thermal protection and contaminant purge functions according to claim 1, characterized in that: The inner sleeve comprises an objective lens sleeve (313), an optical extension sleeve assembly (108) and an optical fixing sleeve (109) which are connected in sequence from front to back, wherein the optical extension sleeve assembly (108) comprises a plurality of optical extension sleeves which are connected in sequence end to end; The front end of the objective lens sleeve (313) is threadedly connected to a prism seat (302); The outer side of the objective lens sleeve (313) is provided with supporting ribs, and the supporting ribs abut against the inner side of the gas-liquid barrier layer (107).

5. The high temperature resistant optical endoscope with integrated thermal protection and contaminant purge functions according to claim 4, characterized in that: An outer flange (104) is provided on the outer sleeve (105) located at the rear end portion (1) of the endoscope, and the rear end of the outer flange (104) is sequentially connected to a cooling liquid outlet end structure (101), a cooling liquid inlet end structure (102) and a cooling air inlet end structure (103), the cooling air inlet channel (011) is provided on the cooling air inlet end structure (103), the cooling liquid inlet channel (021) is provided on the cooling liquid inlet end structure (102), and the cooling liquid outlet channel (031) is provided on the cooling liquid outlet end structure (101); An optical sleeve gland (110) is threadedly connected to the cooling gas inlet end structure (103), and the optical sleeve gland (110) is used to abut against the rear end of the optical fixed sleeve (109); A mounting gasket (111) is provided between the rear end of the cooling air inlet end structure (103) and the optical fixing sleeve (109); The outer sleeve (105) is also provided with an interface shell (112), and the interface shell (112) is located outside the coolant outlet end structure (101), the coolant inlet end structure (102) and the cooling gas inlet end structure (103).

6. The high temperature resistant optical endoscope with integrated thermal protection and contaminant purge functions according to claim 4, characterized in that: The outer side of the prism seat (302) is provided with a threaded end cover (301), and the inner side between the outer side of the prism seat (302) and the threaded end cover (301) is provided with a cooling gas turning channel (012); The threaded end cover (301) is provided with a plurality of air film cooling holes, and the air film cooling holes are circular through holes.

7. The high temperature resistant optical endoscope with integrated thermal protection and contaminant purge functions according to claim 6, characterized in that: A heat radiation suppression layer is provided on the outer side wall of the threaded end cover (301), and the material of the heat radiation suppression layer is gold or platinum.

8. The high temperature resistant optical endoscope with integrated thermal protection and contaminant purge functions according to claim 4, characterized in that: The optical imaging module comprises a right-angle prism (304), a first convex lens (307), a second convex lens (309), a first concave lens (310), a third convex lens (312), a first relay lens (201), a second relay lens (202), a third relay lens (203) and a fourth relay lens (204); The right-angle prism (304) is installed in the prism seat (302), an observation port is provided on the prism seat (302), and the incident surface of the right-angle prism (304) is located at the observation port; The first convex lens (307), the second convex lens (309), the first concave lens (310) and the third convex lens (312) are sequentially arranged in the objective lens sleeve (313) from front to back, and the second convex lens (309) and the first concave lens (310) are bonded and fixed; The first relay lens (201), the second relay lens (202), the third relay lens (203) and the fourth relay lens (204) are sequentially arranged from front to back in the optical extension sleeve assembly (108) located at the middle part (2) of the endoscope; The optical axes of the first convex lens (307), the second convex lens (309), the first concave lens (310), the third convex lens (312), the first relay lens (201), the second relay lens (202), the third relay lens (203) and the fourth relay lens (204) are coaxially arranged.

9. The high temperature resistant optical endoscope with integrated thermal protection and contaminant purge functions according to claim 8, characterized in that: A square groove is provided in the right-angle prism (304), a prism pad (303) and the right-angle prism (304) are installed in the square groove, and the inclined surface of the prism pad (303) is in contact with the inclined surface of the right-angle prism (304).

10. The high temperature resistant optical endoscope with integrated thermal protection and contaminant purge functions according to claim 8, characterized in that: The optical-mechanical assembly module comprises a prism pressure ring (305), a first lens top ring (308), a second lens top ring (311) and a plurality of lens pressure rings (205); The prism pressing ring (305) is installed in a mounting groove in the prism seat (302), the front end of the prism pressing ring (305) abuts against the right-angle prism (304), and the rear end of the prism pressing ring (305) abuts against the front end of the objective lens sleeve (313); The first lens top ring (308) is installed in the objective lens sleeve (313), the front end of the first lens top ring (308) abuts against the first convex lens (307), and the rear end of the first lens top ring (308) abuts against the second convex lens (309); The second lens top ring (311) is installed in the objective lens sleeve (313), the front end of the second lens top ring (311) abuts against the first concave lens (310), and the rear end of the second lens top ring (311) abuts against the third convex lens (312); A lens pressing ring (205) is provided at the rear end of the third convex lens (312), the front and rear ends of the first relay lens (201), the front and rear ends of the second relay lens (202), the front and rear ends of the third relay lens (203), and the front and rear ends of the fourth relay lens (204).

Images