42results about How to "Realize dynamic protection" patented technology

The invention discloses a log desensitization method. The method comprises the following steps: receiving a log query request message sent by a client; determining a corresponding log desensitizationstrategy according to information in the log query request; extracting an original log corresponding to the log query request message; judging whether sensitive data exists in the original log or not;and if the sensitive data exists in the original log, performing desensitization conversion on the extracted original log according to the log desensitization strategy. In addition, the invention also discloses a server and a storage medium. According to the method and the device, log data of different results can be provided for visitors with different identity information, and dynamic protection on sensitive data is realized.

The invention discloses a method for protecting a trial witness picture. The method comprises the following steps of taking a witness room picture before a witness enters a witness room as a reference frame, taking a witness room picture after the witness enters the witness room as a current frame, and executing an encoding process; calculating the sum of brightness absolute differences between macro blocks corresponding to the reference frame and the current frame; determining a witness rectangular region in the current frame according to a macro block whose sum of brightness absolute differences is greater than or equal to a threshold, and setting the witness rectangular region as a region of interest in the current frame; setting an H.264 coding quantization parameter of the region of interest in the current frame to be larger than H.264 coding quantization parameters of other regions except the region of interest in the current frame; performing H.264 encoding on the current frame and then sending out the current frame; and taking the current frame as the reference frame, taking the next frame of the current as the current frame, and repeating the encoding process circularly. The invention further discloses a trial witness picture protection device and system, and a video motion picture protection method and device. The method, the device and the system for protecting the trial witness picture and the video motion picture provided by the invention can realize the dynamic protection of the witness picture in motion, and ensure real-time and fast trial live streaming.

The invention discloses a shell-and-tube heat exchanger. By the shell-and-tube heat exchanger, heat exchange between two types of liquid can be implemented effectively; the shell-and-tube heat exchanger has temperature difference compensation ability; and the circumstance that the heat exchanger is damaged due to over large temperature difference stress between a shell and heat exchanging tubes can be avoided. The shell-and-tube heat exchanger comprises a tube pass portion, a shell pass portion and a plurality of supports, wherein the tube pass portion comprises a tube pass inlet tube, a tube pass outlet tube and a plurality of heat exchanging tubes; the shell pass portion comprises a heat exchanger outer shell, a shell pass inlet tube and a shell pass outlet tube; the heat exchanger outer shell consists of an end socket, a shell head and a channel; a fixing tube plate is arranged between the shell head and the channel; an end socket tube plate is arranged between the end socket and the channel; the inside of the shell head is divided into a tube pass flow inlet cavity and a tube pass flow outlet cavity by a tube pass flow separating plate; and the channel is provided with an expansion joint. The shell-and-tube heat exchanger has the advantages that the position of the expansion joint easily deforms, a structural temperature difference compensating effect is achieved by the slidable end socket tube plate, and structural damage caused by over large temperature difference stress is avoided.

The invention discloses a real-time video transmission adaptive forward error correction method and system based on deep learning, which can predict the network condition change trend in a future period of time when the network condition fluctuates and adaptively change the parameters of a forward error correction algorithm so as to ensure the transmission quality of real-time video data. The method mainly contributes to (1) learning a change rule of a network condition through a neural network model so as to predict a future network packet loss condition for a past network condition; and (2)adding a counter module to the model, and converting model output from a network feature sequence into a network packet loss rate, so that the model output is simplified, and the prediction accuracy is improved; and (3) setting an interval between past and future time periods during neural network learning and prediction, so that the problem of real-time feedback of network conditions is solved, and the neural network model can be used for real-time prediction in a real-time video transmission system.

The invention relates to the technical field of waterproof construction, in particular to waterproof technologies of underground engineering such as subways, underground pipelines, tunnels, underground pipe corridors, underground garages and underground air defense facilities, and discloses a full surrounding skin-type structure of underground waterproof engineering and a construction method. The full surrounding skin-type structure of the underground waterproof engineering comprises a bottom layer, a top layer and a side face layer; the bottom layer, the top layer and the side face layer are surrounded to be whole and form a hollow structure; water-soluble non-curing coating layers and thin film reinforcing layers are arranged on the bottom layer, the top layer and the side face layer correspondingly; and the bottom water-soluble non-curing coating layer, the side face water-soluble non-curing coating layer and the top water-soluble non-curing coating layer form the integrated seamless connection full surrounding structure. According to the full surrounding skin-type structure of the underground waterproof engineering and the construction method, the defects that in the prior art, as for the underground waterproof engineering, whole failure or leakage in local joints are easy to occur are overcome.

The invention provides a building isolation bearing fire protection device, and relates to the technical field of building protection. The fire protection device is designed for solving the problem offire safety in existing isolation buildings. The building isolation bearing fire protection device comprises an upper pier column, lower pier column, a rubber isolation bearing, a fireproof board, aflame retardant protective layer and a fireproof coating layer; the fireproof board comprises an upper fireproof board, a lower fireproof board and elastic fireproof sealants; the upper fireproof board is connected with the upper pier column by fixing bolts, and the lower fireproof board is connected with the lower pier column by fixing bolts; a clearance is formed between the upper pier column and the lower pier column, and filled with the elastic fireproof sealants; and the flame retardant protective layer and the fireproof coating layer are wrapped on the body of the rubber isolation bearing in sequence, and a fireproof space is formed between the outer circumferential surface of the fireproof coating layer and the inner circumferential of the fireproof board. According to the buildingisolation bearing fire protection device provided by the invention, effective fire protection can be provided for isolation buildings.

The invention discloses a dynamic management method and device of a security mechanism. The method includes the steps of extracting subject attributes and object attributes of an access data stream; according to a preset ternary relationship and the subject attributes and object attributes of the access data stream, determining security mechanism components required by the access data stream, wherein the ternary relationship is a relationship among the subject attributes, the object attributes and security mechanism attributes; recombining the determined security mechanism components to generate a security protection system. In this way, the dynamic protection of internet services is achieved, accordingly the internet services and the security protection mechanism of an internet-based information system are more targeted, and the security protection capability of the internet services or the internet-based information system is also improved.

The invention provides a partition type waterproof structure of a subsurface structure baseplate and a construction method. The partition type waterproof structure comprises a concrete under layer, amodified asphalt waterproof roll layer, a non-solidified rubber asphalt partition grid layer, a waterproof mortar protection layer and a concrete structure baseplate layer which are laid from the bottom to the top in sequence. The waterproof layer of the structure baseplate is partitioned by adopting the non-solidified rubber asphalt, and the waterproof mortar protection layer is laid. The partition type waterproof structure greatly improves the maintenance efficiency, reduces the maintenance cost, and enhances the impermeability.

The invention discloses a tube-shell type heat exchange device and aims to provide a heat exchange device which can effectively achieve heat exchange between two types of liquid, has temperature difference compensation capacity and can be prevented from being damaged due to over-large temperature difference stress between a shell and a heat exchange tube. The tube-shell type heat exchange device comprises a tube pass part, a shell pass part and a plurality of brackets, wherein the tube pass part comprises a tube pass inlet tube, a tube pass outlet tube and a plurality of heat exchange tubes; the shell pass part comprises an outer heat exchanger shell, a shell pass inlet tube and a shell pass outlet tube; the outer heat exchanger shell consists of a sealing head, a shell head and a tube box; a fixed tube plate is arranged between the shell head and the tube box; a sealing head tube plate is arranged between the sealing head and the tube box; a tube pass flow partition plate partitions the interior of the shell head into a tube pass inflow cavity and a tube pass outflow cavity; an expansion joint is arranged on the tube box. The tube-shell type heat exchange device has the beneficial effects that according to the characteristic hat the expansion joint is relatively easy to deform, by the cooperation of the slidable sealing head tube plate, the structural temperature difference compensation effect can be achieved, and the structural damage caused by over-large temperature difference stress is avoided.

The invention provides an intelligent instrument circuit board intellectual property protection device and method. In the device, an industrial control computer board is used for controlling plugging of programmable logic device monitoring circuit boards from motherboard sockets and read-write of a FLASH memory. Motherboards are used for realizing bus mode electrical connection and mechanical structure connection among the industrial control computer board, the sockets of the circuit boards of which the intellectual property needs to be protected in instruments and the motherboards. The circuit board sockets on the motherboards are used for fixedly plugging the sockets of the circuit boards of which the intellectual property needs to be protected on the motherboards via butting and realizing electrical connection of a power supply and an electric signal between the motherboards. With application of the aforementioned scheme, static protection of the intellectual property can be realized, and dynamic protection of execution time can also be realized so that acquisition or reverse engineering of FPGA or DSP core intellectual property codes on all the circuit boards of the instruments by illegal users can be prevented, and thus the intellectual property of the intelligent test instruments can be protected and the intelligent test instruments can be prevented from being imitated.

The invention discloses a chemical engineering heat exchanger and aims to provide a heat exchanger which can effectively realize heat exchange between two liquors, has capability of temperature difference compensation and can be prevented from being damaged due to excessively large temperature difference stress between a shell and heat exchange tubes. The chemical engineering heat exchanger comprises a tube pass part, a shell pass part and a plurality of brackets, wherein the tube pass part comprises a tube pass inlet tube, a tube pass outlet tube and the plurality of heat exchange tubes; the shell pass part comprises a heat exchanger shell body, a shell pass inlet tube and a shell pass outlet tube; the heat exchanger shell body comprises a seal head, a shell head and a tube box; a fixed tube plate is arranged between the shell head and the tube box; a seal head tube plate is arranged between the seal head and the tube box; a tube pass flow baffle is used for dividing the interior of the shell head into a tube pass inflow cavity and a tube pass outflow cavity; an expansion joint is arranged on the tube box. The chemical engineering heat exchanger has the benefits that a structural temperature difference compensation effect can be achieved in combination with the slidable seal head tube plate based on a characteristic of easiness for deformation at the expansion joint, and structural damage caused by excessively large temperature difference stress is avoided.

The invention discloses a tube array type heat exchanger, and aims at providing a heat exchanger with the advantages that the heat exchange between two kinds of liquid can be effectively realized, the temperature difference compensation capability is realized, and the damage due to too great temperature difference stress between a casing and a heat exchange tube can be prevented. The tube array type heat exchanger comprises a tube pass part, a casing pass part and a plurality of support frames, wherein the tube pass part comprises a tube pass inlet tube, a tube pass outlet tube and a plurality of heat exchange tubes, the casing pass part comprises a heat exchanger outer casing, a casing pass inlet tube and a casing pass outlet tube, the heat exchanger outer casing consists of a sealing head, a casing head and a tube box, a fixing tube plate is arranged between the casing head and the tube box, a sealing head tube plate is arranged between the sealing head and the tube box, one tube pass separation plate separates the inside of the casing head into a tube pass flow inlet cavity and a tube pass flow outlet cavity, and an expansion joint is arranged on the tube box. The tube array type heat exchanger has the beneficial effects that the characteristic that the expansion joint part is relatively easy to deform can be utilized to be matched with the slidable sealing head tube plate to achieve the structural temperature difference compensation effect, and the structure damage due to too great temperature difference stress is avoided.

The invention discloses a double-pass double-liquid heat exchange device and aims to provide a heat exchange device which can effectively realize heat exchange between two liquid, has the temperature difference compensation capacity and can prevent a shell and heat exchange tubes from being damaged caused by overlarge temperature difference stress between the shell and the heat exchange tubes. The double-pass double-liquid heat exchange device comprises a tube pass part, a shell pass part and a plurality of support frames, wherein the tube pass part comprises a tube pass inlet tube, a tube pass outlet tube and a plurality of heat exchange tubes; the shell pass part comprises a heat exchanger shell, a shell pass inlet tube and a shell pass outlet tube; the heat exchanger shell consists of a sealing head, a shell head and a tube box; a fixed tube plate is arranged between the shell head and the tube box; a sealing head tube plate is arranged between the sealing head and the tube box; the inner part of the shell head is divided into a tube pass flow inlet cavity and a tube pass flow outlet cavity through a tube pass flow isolation plate; an expansion joint is arranged on the tube box. The double-pass double-liquid heat exchange device has the benefits that through the characteristic that the deformation of the expansion joint is relatively easy and in cooperation with the slideable sealing head tube plate, a structural temperature difference compensation function can be realized, and the structure damage caused by overlarge temperature difference stress is avoided.

The invention discloses a tube-shell type double-liquid heat exchange device and aims to provide a heat exchange device which can effectively achieve heat exchange between two types of liquid, has temperature difference compensation capacity and can be prevented from being damaged due to over-large temperature difference stress between a shell and a heat exchange tube. The tube-shell type double-liquid heat exchange device comprises a tube pass part, a shell pass part and a plurality of brackets, wherein the tube pass part comprises a tube pass inlet tube, a tube pass outlet tube and a plurality of heat exchange tubes; the shell pass part comprises an outer heat exchanger shell, a shell pass inlet tube and a shell pass outlet tube; the outer heat exchanger shell consists of a sealing head, a shell head and a tube box; a fixed tube plate is arranged between the shell head and the tube box; a sealing head tube plate is arranged between the sealing head and the tube box; a tube pass flow partition plate partitions the interior of the shell head into a tube pass inflow cavity and a tube pass outflow cavity; an expansion joint is arranged on the tube box. The tube-shell type double-liquid heat exchange device has the beneficial effects that according to the characteristic hat the expansion joint is relatively easy to deform, by the cooperation of the slidable sealing head tube plate, the structural temperature difference compensation effect can be achieved, and the structural damage caused by over-large temperature difference stress is avoided.

The invention discloses a double-pass double-liquid heat exchange device and aims to provide a heat exchange device which can effectively realize heat exchange between two liquid, has the temperature difference compensation capacity and can prevent a shell and heat exchange tubes from being damaged caused by overlarge temperature difference stress between the shell and the heat exchange tubes. The double-pass double-liquid heat exchange device comprises a tube pass part, a shell pass part and a plurality of support frames, wherein the tube pass part comprises a tube pass inlet tube, a tube pass outlet tube and a plurality of heat exchange tubes; the shell pass part comprises a heat exchanger shell, a shell pass inlet tube and a shell pass outlet tube; the heat exchanger shell consists of a sealing head, a shell head and a tube box; a fixed tube plate is arranged between the shell head and the tube box; a sealing head tube plate is arranged between the sealing head and the tube box; the inner part of the shell head is divided into a tube pass flow inlet cavity and a tube pass flow outlet cavity through a tube pass flow isolation plate; an expansion joint is arranged on the tube box. The double-pass double-liquid heat exchange device has the benefits that through the characteristic that the deformation of the expansion joint is relatively easy and in cooperation with the slideable sealing head tube plate, a structural temperature difference compensation function can be realized, and the structure damage caused by overlarge temperature difference stress is avoided.

The invention discloses a shell-and-tube heat exchanger. By the shell-and-tube heat exchanger, heat exchange between two types of liquid can be implemented effectively; the shell-and-tube heat exchanger has temperature difference compensation ability; and the circumstance that the heat exchanger is damaged due to over large temperature difference stress between a shell and heat exchanging tubes can be avoided. The shell-and-tube heat exchanger comprises a tube pass portion, a shell pass portion and a plurality of supports, wherein the tube pass portion comprises a tube pass inlet tube, a tube pass outlet tube and a plurality of heat exchanging tubes; the shell pass portion comprises a heat exchanger outer shell, a shell pass inlet tube and a shell pass outlet tube; the heat exchanger outer shell consists of an end socket, a shell head and a channel; a fixing tube plate is arranged between the shell head and the channel; an end socket tube plate is arranged between the end socket and the channel; the inside of the shell head is divided into a tube pass flow inlet cavity and a tube pass flow outlet cavity by a tube pass flow separating plate; and the channel is provided with an expansion joint. The shell-and-tube heat exchanger has the advantages that the position of the expansion joint easily deforms, a structural temperature difference compensating effect is achieved by the slidable end socket tube plate, and structural damage caused by over large temperature difference stress is avoided.

The invention discloses a double-liquid heat exchange device and aims at providing a heat exchange device which can effectively realize heat exchange between two kinds of liquid, has a temperature difference compensation capacity and can prevent a shell and heat exchange tubes from being damaged due to excessive large temperature difference stress. The double-liquid heat exchange device comprises a tube pass portion, a shell pass portion and a plurality of supports, wherein the tube pass portion comprises a tube pass inlet tube, a tube pass outlet tube and a plurality of heat exchange tubes, the shell pass portion comprises a heat exchanger shell body, a shell pass inlet tube and a shell pass outlet tube, the heat exchanger shell body consists of a seal head, a shell head and a tube box, a fixing tube plate is arranged between the shell head and the tube box, a seal head tube plate is arranged between the seal head and the tube box, a tube pass flow isolating plate divides the internal portion of the shell head into a tube pass flow inlet chamber and a tube pass flow outlet chamber, and an expansion joint is arranged on the tube box. The double-liquid heat exchange device has the beneficial effects that a structural temperature difference compensation effect can be achieved through the characteristic of relatively easy deformation of the position of the expansion joint in combination with the slidable seal head tube plate, and structural damage is prevented from being caused due to excessively large temperature difference stress.

The invention discloses a shell-and-tube heat exchanger and aims to a heat exchanger, which allows effective heat exchange between two liquids, which allows thermal difference compensation and which prevents damage caused by high thermal difference between a housing and heat exchange tubes. The shell-and-tube heat exchanger comprises a tube side portion, a shell side portion and a plurality of supports; the tube side portion comprises a tube side inlet tube, a tube side outlet tube and a plurality of heat exchange tubes; the shell side portion comprises a shell, a shell side inlet tube and a shell side outlet tube; the shell is composed of a sealing head, a shell head and a tube box; a fixing tube plate is disposed between the shell head and the tube box; a sealing head tube plate is disposed between the sealing head and the tube box; a tube side partition plate divides the inside of the shell head into a tube side inflow cavity and a tube side outflow cavity; the tube box is provided with an expansion joint. The shell-and-tube heat exchanger has the advantages that the expansion joint which easily deforms and the sealing head tube plate are used together to function in structural thermal difference compensating, and structural damage caused by high thermal difference stress is avoided.

The invention discloses a heat exchanger. The heat exchanger can effectively realize the heat exchange between two fluids, and has the temperature difference compensating ability, and can prevent the damage caused by too big temperature difference stress between a shell body and a heat exchange pipe. The heat exchanger comprises a tube pass part, a shell pass part, and several brackets; the tube pass part comprises a tube pass inlet tube, a tube pass outlet tube, and a plurality of heat exchange tubes; the shell pass part includes an outer shell body of the heat exchanger, a shell pass inlet tube, and a shell pass outlet tube; the outer shell body of the heat exchanger is composed of an enclosure head, a shell head and a tube box; a fixing tube plate is arranged between the shell head and the tube box, and an enclosure head tube plate is arranged between the enclosure head and the tube box; a tube pass flow isolating plate partitions the inner part of the shell body into a tube pass inflow cavity and a tube pass outflow cavity; an expansion joint is arranged on the tube box. The heat exchanger has the following beneficial effects: through the characteristics of relatively easy deformation of the expansion joint, and cooperation of the slideable enclosure tube plate, the heat exchanger can play a role of structural temperature compensation, and avoid the structural damage caused by too big temperature difference stress.

The invention discloses a semi-automatic liftable slope surface stone blocking device and belongs to the technical field of environmental protection. The slope surface stone blocking device comprises a lifting device, a stone blocking net, steel wire ropes slidably mounted on the lifting device, and drive devices for driving the steel wire ropes to slide, wherein the stone blocking net and each drive device are connected to the two ends of the steel wire rope respectively. According to the slope surface stone blocking device, dangerous rocks on a high and steep slope are dynamically protected, the slope surface is locally positioned and protected, a worker can finish a series of operations of lifting the stone blocking net, recovering fallen stone, transferring equipment and the like by operating mechanical equipment in a relatively safe position at the top of the slope, the construction site is prevented from being occupied, and the construction safety is improved.

The invention discloses a shell-and-tube heat exchanger. By the shell-and-tube heat exchanger, heat exchange between two types of liquid can be implemented effectively; the shell-and-tube heat exchanger has temperature difference compensation ability; and the circumstance that the heat exchanger is damaged due to over large temperature difference stress between a shell and heat exchanging tubes can be avoided. The shell-and-tube heat exchanger comprises a tube pass portion, a shell pass portion and a plurality of supports, wherein the tube pass portion comprises a tube pass inlet tube, a tube pass outlet tube and a plurality of heat exchanging tubes; the shell pass portion comprises a heat exchanger outer shell, a shell pass inlet tube and a shell pass outlet tube; the heat exchanger outer shell consists of an end socket, a shell head and a channel; a fixing tube plate is arranged between the shell head and the channel; an end socket tube plate is arranged between the end socket and the channel; the inside of the shell head is divided into a tube pass flow inlet cavity and a tube pass flow outlet cavity by a tube pass flow separating plate; and the channel is provided with an expansion joint. The shell-and-tube heat exchanger has the advantages that the position of the expansion joint easily deforms, a structural temperature difference compensating effect is achieved by the slidable end socket tube plate, and structural damage caused by over large temperature difference stress is avoided.

The invention discloses a chemical engineering heat exchanger and aims to provide a heat exchanger which can effectively realize heat exchange between two liquors, has capability of temperature difference compensation and can be prevented from being damaged due to excessively large temperature difference stress between a shell and heat exchange tubes. The chemical engineering heat exchanger comprises a tube pass part, a shell pass part and a plurality of brackets, wherein the tube pass part comprises a tube pass inlet tube, a tube pass outlet tube and the plurality of heat exchange tubes; the shell pass part comprises a heat exchanger shell body, a shell pass inlet tube and a shell pass outlet tube; the heat exchanger shell body comprises a seal head, a shell head and a tube box; a fixed tube plate is arranged between the shell head and the tube box; a seal head tube plate is arranged between the seal head and the tube box; a tube pass flow baffle is used for dividing the interior of the shell head into a tube pass inflow cavity and a tube pass outflow cavity; an expansion joint is arranged on the tube box. The chemical engineering heat exchanger has the benefits that a structural temperature difference compensation effect can be achieved in combination with the slidable seal head tube plate based on a characteristic of easiness for deformation at the expansion joint, and structural damage caused by excessively large temperature difference stress is avoided.

The invention discloses a tube-shell type double-liquid heat exchange device and aims to provide a heat exchange device which can effectively achieve heat exchange between two types of liquid, has temperature difference compensation capacity and can be prevented from being damaged due to over-large temperature difference stress between a shell and a heat exchange tube. The tube-shell type double-liquid heat exchange device comprises a tube pass part, a shell pass part and a plurality of brackets, wherein the tube pass part comprises a tube pass inlet tube, a tube pass outlet tube and a plurality of heat exchange tubes; the shell pass part comprises an outer heat exchanger shell, a shell pass inlet tube and a shell pass outlet tube; the outer heat exchanger shell consists of a sealing head, a shell head and a tube box; a fixed tube plate is arranged between the shell head and the tube box; a sealing head tube plate is arranged between the sealing head and the tube box; a tube pass flow partition plate partitions the interior of the shell head into a tube pass inflow cavity and a tube pass outflow cavity; an expansion joint is arranged on the tube box. The tube-shell type double-liquid heat exchange device has the beneficial effects that according to the characteristic hat the expansion joint is relatively easy to deform, by the cooperation of the slidable sealing head tube plate, the structural temperature difference compensation effect can be achieved, and the structural damage caused by over-large temperature difference stress is avoided.

The invention discloses a tube-and-shell heat exchanger and aims to provide a heat exchanger, allowing effective heat exchange between two liquids, having thermal difference compensating capacity and preventing damage caused by thermal difference stress between a shell and heat exchange tubes. The tube-and-shell heat exchanger comprises a tube side portion, a shell side portion and a plurality of supports; the tube side portion comprises a tube side incoming tube, a tube side outgoing tube and a plurality of heat exchange tubes; the shell side portion comprises a housing, a shell side incoming tube and a shell side outgoing tube; the housing is composed of a seal head, a shell head and a tube box; a fixing tube plate is disposed between the shell head and the tube box; a seal head tube plate is disposed between the seal head and the tube box; a tube side partition plate divides the inside of the shell head into a tube side inflow cavity and a tube side outflow cavity; the tube box is provided with an expansion joint. The tube-and-shell heat exchanger has the advantages that the expansion joint featuring ease of deformation and the seal head tube plate slidable fit to function in structural thermal difference compensation, and structural damage caused by excessively high thermal temperature stress is avoided.

The invention discloses a heat exchanging device for chemical industry, and aims to provide a heat exchanging device which can effectively realize the heat exchange of two kinds of liquid, has the capability of compensating for temperature difference, and can prevent the damage of a shell due to the excessive differential temperature stress between the shell and a heat exchanging tube. The heat exchanging device comprises a tube pass part, a shell pass part and a plurality of supports, wherein the tube pass part comprises a tube-pass inlet tube, a tube-pass outlet tube and a plurality of heat exchanging tubes; the shell pass part comprises an outer shell of the heat exchanging device, a shell-pass inlet tube and a shell-pass outlet tube; the outer shell of the heat exchanging device consists of an end cap, a shell head and a tube box, a fixing tube plate is arranged between the shell head and the tube box, an end-cap tube plate is arranged between the end cap and the tube box, a tube-pass flow partition plate divides the inside of the shell head into a tube-pass flow inlet cavity and a tube-pass flow outlet cavity, and an expansion joint is arranged on the tube box. The heat exchanging device disclosed by the invention has the benefits that through the characteristic that the expansion joint is relatively easy to deform, the end-cap tube plate which can slide is matched, so that the heat exchanging device has a structural effect of compensating for temperature difference, and the structural damage due to the excessive differential temperature stress can be avoided.

The invention provides a tunnel grounding intelligent method and device, and the method comprises the steps: dividing a tunnel according to a certain distance, setting a tunnel distribution box in each section, setting a residual current protector with an adjustable residual action current value in each tunnel distribution box, and enabling each tunnel distribution box to supply power to an illumination lamp and a jet fan in the corresponding section; wherein each section is provided with a deeply-buried grounding body and a control box, and the deeply-buried grounding bodies between the sections are mutually independent; acquiring the resistance to ground, the current to ground and the relative humidity in the interval in real time; and when the deeply-buried grounding body is slowly corroded with the passage of time and the resistance value is increased, the control box modifying the residual action current value of the residual current protector on line, so that dynamic protection of tunnel grounding is realized.

The invention discloses a tube-and-shell heat exchanger and aims to provide a heat exchanger, allowing effective heat exchange between two liquids, having thermal difference compensating capacity and preventing damage caused by thermal difference stress between a shell and heat exchange tubes. The tube-and-shell heat exchanger comprises a tube side portion, a shell side portion and a plurality of supports; the tube side portion comprises a tube side incoming tube, a tube side outgoing tube and a plurality of heat exchange tubes; the shell side portion comprises a housing, a shell side incoming tube and a shell side outgoing tube; the housing is composed of a seal head, a shell head and a tube box; a fixing tube plate is disposed between the shell head and the tube box; a seal head tube plate is disposed between the seal head and the tube box; a tube side partition plate divides the inside of the shell head into a tube side inflow cavity and a tube side outflow cavity; the tube box is provided with an expansion joint. The tube-and-shell heat exchanger has the advantages that the expansion joint featuring ease of deformation and the seal head tube plate slidable fit to function in structural thermal difference compensation, and structural damage caused by excessively high thermal temperature stress is avoided.

The invention discloses a tube-shell type heat exchange device and aims to provide a heat exchange device which can effectively achieve heat exchange between two types of liquid, has temperature difference compensation capacity and can be prevented from being damaged due to over-large temperature difference stress between a shell and a heat exchange tube. The tube-shell type heat exchange device comprises a tube pass part, a shell pass part and a plurality of brackets, wherein the tube pass part comprises a tube pass inlet tube, a tube pass outlet tube and a plurality of heat exchange tubes; the shell pass part comprises an outer heat exchanger shell, a shell pass inlet tube and a shell pass outlet tube; the outer heat exchanger shell consists of a sealing head, a shell head and a tube box; a fixed tube plate is arranged between the shell head and the tube box; a sealing head tube plate is arranged between the sealing head and the tube box; a tube pass flow partition plate partitions the interior of the shell head into a tube pass inflow cavity and a tube pass outflow cavity; an expansion joint is arranged on the tube box. The tube-shell type heat exchange device has the beneficial effects that according to the characteristic hat the expansion joint is relatively easy to deform, by the cooperation of the slidable sealing head tube plate, the structural temperature difference compensation effect can be achieved, and the structural damage caused by over-large temperature difference stress is avoided.

The invention discloses a double-pass heat exchanger and aims at providing a heat exchanger which can effectively realize heat exchange between two kinds of liquid, has a temperature difference compensation capacity and can prevent a shell and heat exchange tubes from being damaged due to excessive large temperature difference stress. The double-pass heat exchanger comprises a tube pass portion, a shell pass portion and a plurality of supports, wherein the tube pass portion comprises a tube pass inlet tube, a tube pass outlet tube and a plurality of heat exchange tubes, the shell pass portion comprises a heat exchanger shell body, a shell pass inlet tube and a shell pass outlet tube, the heat exchanger shell body consists of a seal head, a shell head and a tube box, a fixing tube plate is arranged between the shell head and the tube box, a seal head tube plate is arranged between the seal head and the tube box, a tube pass flow isolating plate divides the internal portion of the shell head into a tube pass flow inlet chamber and a tube pass flow outlet chamber, and an expansion joint is arranged on the tube box. The double-pass heat exchanger has the beneficial effects that a structural temperature difference compensation effect can be achieved through the characteristic of relatively easy deformation of the position of the expansion joint in combination with the slidable seal head tube plate, and structural damage is prevented from being caused due to excessively large temperature difference stress.