74results about How to "Affect the sealing effect" patented technology

The invention provides a sampling valve comprising a valve body, a valve core, a cylinder body and a piston control assembly, wherein the valve core and the cylinder body are arranged in the valve body, the piston control assembly is arranged in the cylinder body, and the valve body is arranged below the cylinder body and is provided with a feed port and a discharge hole; the upper end of the valve core is connected with the piston control assembly, and the lower end of the valve core is connected and provided with a sealed drain plug which seals the feed port; the valve core is provided with a spacing groove along a valve core shaft; and the inner wall of the valve body is provided with a spacing chuck in sliding fit with the spacing groove. The sampling valve provided by the invention can realize all-around spacing to the valve core and the situation that the external sealing material of the sealed drain plug is damaged because of valve core spinning can not occurred. In addition, the sealed drain plug of the invention adopts the mode of combining ethylene propylene rubber with cheap inside and Teflon with expensive outside to ensure sealed drain plug performance and lower cost thereof at the same time.

The invention discloses an improved roadway boring machine. The upper portion of a rack is connected with a hydraulic motor and a cantilever, the outer side of the cantilever is connected with a cutting head, a nozzle is arranged on the outside of the cutting head, and a water injection pipe is further arranged inside the cantilever; a first through hole is formed between the cantilever and the water injection pipe, the hydraulic motor is connected with a water injection ring through a support frame, and the water injection ring is connected with a water inlet pipe through a water pipe joint; and the outside of the bearings are sleeved with sealing rings, each sealing ring comprises a first rubber ring and two second rubber rings, and the two second rubber rings are respectively located on both sides of each bearing, first springs are arranged between the second rubber rings and the first rubber rings, the two sides of the second rubber rings and the first rubber rings are connected through connection rigs, annular cavities are further formed inside the first rubber rings, two second through holes are formed inside the annular cavities, and the outside of two first rubber rings are sleeved with sleeve tubes. The improved roadway boring machine can improve the deficiencies of the prior art, and a spray structure of the improved roadway boring machine has a better sealing and a cooling effect.

The invention belongs to the technical field of construction engineering, and particularly discloses a prefabricated reinforced concrete shear wall. The prefabricated reinforced concrete shear wall comprises a first mounting wall, a second mounting wall, an inserting mechanism and a sealing connecting mechanism; the connection between the first mounting wall and the second mounting wall is in an upper-arc shape; the inserting mechanism is arranged in the first mounting wall, and the inserting mechanism comprises two transmission belt wheels, teeth, a sliding groove, first brake blocks, a second brake block and an inserting column; the two transmission belt wheels are symmetrically and fixedly connected at the lower end of the first mounting wall, the teeth are fixedly mounted on the outersurface of the transmission belt wheels, the first brake blocks are fixedly connected to the outer surfaces of the lower sides of the left ends of the transmission belt wheels, and the inner ends of the transmission belt wheels are connected with the inserting column through gear engagement; and the inserting column is mounted in the sliding groove in the first mounting wall. The prefabricated reinforced concrete shear wall is mainly used for solving the problems that an existing prefabricated reinforced concrete shear wall has low seismic resistance in an earthquake-prone area, and the sealing performance of the wall body is lowered due to the frequency of small earthquakes.

The invention discloses an auxiliary device for aero-engine casing assembling. The auxiliary device comprises an annular channel and 2-6 air heaters arranged on the annular channel, wherein assembly flange spigot sides of to-be-assembled casing segments are surrounded in the annular channel. An outlet of each air heater communicates with the annular channel through an air heating pipe. According to the auxiliary device, the annular channel is designed to be of a halved structure; under the condition that a small distance is reserved between two adjacent casing segments, the two halved parts ofthe annular channel can be fixed to the spigot end faces of the to-be-assembled casing segments, and a spigot is heated; the auxiliary device demounting time and the matched casing assembly adjustingtime are shortened, the pre-assembly work of matched casing segments is advanced to be before spigot heating, and the pre-assembly time is shortened; and the casing assembling requirement is met, andmeanwhile the casing assembling efficiency is greatly improved.

The invention relates to a refrigerator and a storage container for the refrigerator. The storage container comprises a sealing ring arranged at the front end of a cylinder body, the sealing ring comprises a ring-shaped connecting wall, a mounting part arranged on one side of the connecting wall and a propping part arranged on the other side of the connecting wall, the mounting part is inserted into the cylinder body or a drawer, and the propping part props against the drawer or the cylinder body; the sealing ring is configured to allow the propping part to deviate from the drawer or the cylinder body to form a gap under the action of the difference of an internal pressure and an external pressure of the cylinder body, so that air in the cylinder body flows to the outside of the cylinder body from the gap, or air at the outside of the cylinder body flows into the cylinder body through the gap. In addition, the invention further provides a refrigerator with the storage container. The balance of the internal pressure and the external pressure of the storage container is kept as much as possible, so that the drawer can be opened conveniently.

The invention discloses a novel pure-metal seal joint structure which comprises a joint A and a joint B. A sealing base sleeve is connected to the inner wall of the joint A in a clamped mode. The novel pure-metal seal joint structure further comprises a fastening nut. Threads matched with the fastening nut are arranged on outer walls of the joint A and the joint B, a spherical surface corresponding to the sealing base sleeve is arranged at one end close to the sealing base sleeve, of the joint B, the joint A, all of the joint B and the sealing base sleeve are made of metal, and the hardness of the sealing base sleeve is smaller than that of the joint B. The joint A and the joint B are oppositely screwed through the fastening nut to enable the spherical surface arranged on the joint B to be pressed and arranged on the sealing base sleeve in the joint A, the spherical surface arranged on the joint B extrudes the sealing base sleeve through axial fastening force of the fastening nut, and accordingly the sealing base sleeve deforms elastically. Sealing is achieved through tight and reliable connection of the spherical surface and the sealing base sleeve, the structure is not easily abraded and does not age, and deformation influencing the sealing effect does not occur.

The invention belongs to the technical field of shoe washing machines, and aims at solving the problem that damage to a power mechanism is easily caused due to the lack of a sealing mechanism in an existing shoe washing machine. For this, the invention provides a sealing mechanism used for a shoe washing machine, and the shoe washing machine. The shoe washing machine comprises a fixed member and aslide mechanism arranged on the fixed member in a slide manner, wherein the sealing mechanism is arranged between the slide mechanism and the fixed member, and used for sealing the fixed member. According to the sealing mechanism used for the shoe washing machine, and the shoe washing machine, through the arrangement for the sealing mechanism between the slide mechanism and the fixed member, sealing for the fixed member can be realized, so that in a shoe washing process of the shoe washing machine, splashing water cannot enter into the power mechanism through the fixed member, and then damageto the power mechanism due to dip dyeing of water is avoided; and meanwhile, the drive efficiency and the service life of the power mechanism cannot be influenced.

The invention discloses a water intake device. The water intake device comprises a casing, a water storage chamber, a lower valve and an upper valve, wherein a water inlet is formed in the bottom of the casing, and a water outlet is formed in the top; the water storage chamber is located between the water inlet and the water outlet, and comprises an upper partition and a lower partition which arein sealed connection with the inner wall of the casing respectively, a water inlet channel is formed in the lower partition, and a water outlet channel is formed in the upper partition; the lower valve is located at an outlet of the water inlet channel, the upper valve is located at an outlet of the water outlet channel, and the bottom of the upper valve is fixedly connected with the top of the lower valve through a connecting piece. When the water intake device is put downwards, water in non-sampling depth flushes open the lower valve through the water inlet and flows into the water storage chamber, then flushes open the upper valve and is discharged from the water outlet, and only water samples in the current depth are retained in the water storage chamber. When the water intake device is lifted up, the lower valve covers the water inlet channel, the upper valve covers the water outlet channel, and water in the non-sampling depth cannot flow into the water intake device in the lifting process. The water intake device is simple in structure and convenient to operate, and can ensure quality of the water samples.

The invention discloses an automatic wine jar sealing device for baijiu production. The automatic wine jar sealing device comprises a storage tank, a cover body and a supporting plate, a support is fixed to the top end of the supporting plate, a third driving motor is installed at one end of the bottom end of one side of the support, and a molding plate is arranged in the cover body. A servo motor rotates to drive a first gear disc to rotate through a gear body, when the first gear disc rotates, work is applied to a shell through cooperation of a threaded hole penetrating through the interior and a threaded rod, and the shell is pushed to the position below the cover body; slurry falling when the shell is not used is collected through a collecting box, and when the collecting box needs to be cleaned, baffles on the two sides are pulled, springs are lengthened and deformed, the baffles are far away from the collecting box, at the moment, the collecting box is pulled out and cleaned, and after cleaning is completed, the collecting box is installed in the shell; and the collecting box is moved to the position below the cover body, and the situation that the placing stability of wine jars above a conveying belt is influenced in the later period due to the fact that when the collecting box is not used, and falling mud falls to the position above the conveying belt is avoided.

The invention discloses an oil-water well packer, and relates to the technical field of oil exploitation equipment. The oil-water well packer comprises a packer body, and a well wall cleaning device is arranged at the bottom of the packer body; and the well wall cleaning device comprises an object cylinder, the object cylinder is cylindrical and is provided with a downward opening, T-shaped inserting rods are fixedly connected to the positions, close to the two sides, of the top of the object cylinder, a stepping motor, a storage battery pack and two electric telescopic rods are arranged inside the object cylinder, the output end of the stepping motor is in transmission connection with a transmission shaft, the interior of the transmission shaft is hollow, an adapter rod is arranged in a movably inserted mode, and one end of the adapter rod and one ends of the electric telescopic rods are both provided with the same push disc. According to the oil-water well packer, by arranging the well wall cleaning device, petroleum protrusions on the surface of the inner wall of an underground pipe column are scraped through wall scraping blocks on the surface of the push disc, and therefore the situation that the surface of the underground pipe column is provided with solidified petroleum protrusions, and consequently, the packing effect of the packer body on the underground pipe column is affected is effectively avoided.

The invention relates to a ball valve which comprises a fixator positioned between a valve ball and a valve body, wherein a first sealing part and a second sealing part are arranged between the fixator and the valve body; the first sealing part is arranged near the fixator; the second sealing part is arranged near the valve body; baffle parts for blocking the first sealing part from moving to the valve body and blocking the second sealing part from moving to the fixator are respectively arranged on the valve body and the fixator. When the inner left side of the ball valve is pressed for the first time, the first sealing part moves rightwards, is blocked by the baffle part on the valve body, and cannot move, the sealing of the fixator and the valve body is realized, and the left side pressure cannot enable the second sealing part to move; When the inner right side of the ball valve is pressed for the first time, the second sealing part moves leftwards, is blocked by the baffle part on the fixator, and cannot move, the sealing of the fixator and the valve body is realized, and the right side pressure cannot enable the first sealing part to move; no matter what the pressure re-entering direction in the ball valve is, the first sealing part and the second sealing part cannot be displaced, and the sealing reliability of the sealing parts is ensured.

The invention provides a seabed valve box and a sealing cover plate thereof, and a maintenance method of the seabed valve box. The seabed valve box comprises a tank body, a seat plate and a guard plate. The tank body is arranged on the inner side of the bottom of a hull and is connected with the outer plate of the hull, and the tank body faces the outer side of the hull and is provided with an opening; the seat plate is fixedly mounted on the outer surface of the periphery of the opening; and the guard plate covers the outer surface of the seat plate and is detachably connected with the seat plate through fasteners. As the seabed valve box is provided with the guard plate, the seat plate is effectively protected from being eroded by seawater to influence the sealing effect, thereby enabling the seat plate to be used for a long time under the complicated seabed environment, and improving the added value of the ship and the offshore platform.

The invention relates to a sand jetting part, and discloses a cooling structure of a sand coating machine for an iron mold. The cooling structure of the sand coating machine for the iron mold is arranged on the sand coating machine. The sand coating machine sequentially comprises a sand jetting mechanism, a sand box and a mold from top to bottom; the sand jetting end of the sand jetting mechanism is connected with the sand box; the sand box and the mold are detachably connected; a heating device is connected under the mold; a support cylinder is connected to the lower end of the heating device, and is fixedly connected onto an installation plate of the sand coating machine; a base plate is connected between the heating device and the support cylinder; a channel group for cooling water to pass through is arranged in the base plate; a water inlet and a water outlet communicating with the channel group are formed on the base plate. According to the technical scheme provided by the invention, the base plate for the water to pass through is utilized to prevent heat of the heating device from transmitting to the support cylinder, so that the temperature rise of the support cylinder is prevented, the influence of high temperature on the sealing effect of a sealing ring on the support cylinder is avoided, and the operation stability of the support cylinder is improved.

The invention discloses a biological sample slide moisturizing box for teaching, and relates to the technical field of slide moisturizing. The biological sample slide moisturizing box for teaching comprises a function box; a partition board is fixed inside the functional box; the inside of the functional box is divided into a left water storage cavity and a right recovery cavity by the partition board; the upper part of the left side of the water storage cavity communicates with a water filling port; the lower part of the right side of the recovery cavity communicates with a water dischargingport; the water filling port and the water discharging port are each provided with a shut-off valve; a conduit is arranged outside the functional box; the water storage cavity communicates with the recovery cavity through the conduit; an ultrasonic atomization module, an air pump and a refrigeration piece are fixedly arranged in the water storage cavity; and the upper end of the functional box isfixedly provided with a water pump. The biological sample slide moisturizing box has the advantages that slides can be respectively and independently stored, a circulating continuous low-temperature moisturizing effect is provided, low-temperature moisture is prevented from leaking, the moisturizing effect is good, and the cleaning is easy.

The invention relates to a butt flange metal sealing cover structure which is used for sealing a flange installed on a pipeline and comprises a main cover mechanism and an outer sealing mechanism, and the outer sealing mechanism is fixed to the outer side of the main cover mechanism and used for sealing the main cover mechanism. The main cover mechanism comprises a semicircular cover shell, and a bottom supporting plate, a rotating abutting plate, a lug block, a U-shaped clamping plate, a fixing bolt, a telescopic round rod and a rubber suction block which are located on the inner side of the semicircular cover shell. The main cover mechanism can carry out further sealing and partition protection on the flange and the connecting end of the pipeline, meanwhile, the main cover mechanism is fixedly connected with the flange through bolts used in cooperation with the flange, and therefore relative rotation of the main cover mechanism is effectively avoided. And the outer sealing mechanism is used for performing external sealing on the joint of the main cover mechanism and the pipeline. Compared with the prior art, further sealing and partition protection can be carried out on the flange and the connecting end of the pipeline, and the overall sealing effect and the connecting firmness between the pipelines are guaranteed.

The invention discloses a sealing against applied to the bottom of a deep flexible waterproof curtain, and preparation and pouring methods thereof. The sealing agent comprises modified bentonite and clay, wherein the modified bentonite is sodium bentonite modified by polyionic cellulose. The sealing agent applied to the bottom of the deep flexible waterproof curtain and the preparation and pouringmethods thereof can realize filling of soil cracks with the sealing agent and complete filling of the bottom of the flexible waterproof curtain, effectively block underground water, solve the problemof leakage of a polluted medium below the flexible waterproof curtain, are suitable for sealing the bottom of the flexible waterproof curtain which is 0-40m deep or deeper, and are especially suitable for sealing the bottom of the deep flexible waterproof curtain which is 20-40 m deep or deeper. The materials of the sealing against are easy to obtain, and the preparation and pouring methods of the sealing agent are convenient and easy.

The invention discloses a self-sealing gate which comprises a support, a bracket, a framework formed by a top plate, a sealing box, a gate, a cable and a waterproof jacket, wherein the gate comprises a guide rod for guiding and a door plate for water distribution; the door plate is articulated with an end part of the guide rod; a movable pulley is arranged at the other end of the guide rod; the top plate is provided with the cable; the cable is wound on the movable pulley and then penetrates through the waterproof jacket arranged at the top of the top plate; the waterproof sealing box surrounds the outer sides of the guider rod and pulley; a guide sleeve is arranged between the guide rod and the sealing box; a sealing ring is arranged on the inner side of the guide sleeve; the door plate is in a conical shape; and the bottom plate is provided with a conical hole matched with the door plate. Through the technical scheme, the self-sealing gate falls under the effect of the gravity thereof and water pressure when closed; the conical door plate is matched with the conical hole; and the self-sealing gate does not need a driving force, conforms to the fluid mechanics, has long service life due to little abrasion and a simple structure, and is convenient to overhaul.

The invention relates to an oil extraction wellhead sealing device which comprises a sealing device shell, a slag removal disc and a gradienter; a polished rod is arranged in the sealing device shell in a penetrating mode; the gradienter is fixed to the lower portion of the polished rod; connecting plates are installed on the left side and the right side of the gradienter correspondingly; sliding parts are installed on the sides, close to the gradienter, of the connecting plates; a sealing air bag is connected with the interiors of the sliding parts; a movable sliding rail is arranged at joints of the sliding parts and the connecting plates; and an inflation pipe is connected with the upper portion of the sealing air bag. According to the oil extraction wellhead sealing device, the gradienter is adopted to monitor the perpendicularity of the polish rod in real time and transmit data to a PLC, the PLC can control a centralizer to work according to received data, the position of the polish rod is adjusted, and the situation that the polish rod is in a vertical state is guaranteed, so that the situation that the polish rod is inclined, and sealing is not thorough is avoided; and in addition, through the arrangement of the slag removal disc, waste scraps and waste residues generated on the surface of the polished rod can be cleaned.

The invention discloses an enhanced liquid-rich battery with a seal battery cover, which belongs to the technical field of batteries. The battery comprises a casing body. A casing cover is arranged onthe top of the casing body. A matched acid injection cap is arranged on the inner wall of an acid injection hole. The acid injection cap includes a fixed plate connected with a boss. A plug is connected with the bottom of the fixed plate. The bottoms of positive and negative poles are connected with positive and negative terminals of a battery pole plate which is arranged in the inner cavity of the casing body respectively. According to the device, the matched acid injection cap is arranged on the inner wall of the acid injection hole, which effectively improves the sealing of the acid injection hole; the acid injection cap is provided with the fixed plate connected with the boss, which effectively improves the fixedness of the acid injection cap and prevent the leakage of the internal electrolyte of the battery caused by the fall of the acid injection cap; the outer walls of the poles are sleeved by gaskets and pressure rings; the gaps between the poles and the pressure rings are filled with sealants, which effectively improves the fixing effect of the poles; and furthermore, the sealing effect of the poles and pole holes is improved through the filling of the sealants.

The invention discloses a turnable bearing with an inner ring provided with a V-shaped belt groove. The turnable bearing comprises an outer ring (1), a rolling ball (2), a finned seal ring (3), an inner ring (4), an isolating block (5), a plug (6) and a conical locating pin (7). The outer ring (1) comprises an inner raceway body and an installation body and is shaped like an outer stair step. The inner ring (4) comprises a belt body and an outer raceway body and is shaped like an inner stair step. An inner raceway is arranged on the inner raceway body. An outer raceway and an inner threaded hole (4.2) are arranged on the outer raceway body. The installation body is provided with an installation hole (1.1) and the belt body is provided with a V-shaped belt groove (4.1). By the installation hole, the inner threaded hole (4.2) and an inner hole formed in the outer raceway body, the end face of an outer locating ring and the end face of an inner locating ring are on the same side, the use range of the turnable bearing is widened and the use requirements of a matched host machine are met to the highest degree. The structure is novel and unique and the installation is extremely convenient.

The invention relates to the technical field of cardiac aorta surgeries and particularly relates to a hemostatic stent for a cardiac aorta surgery. The hemostatic stent comprises a shell I, wherein two sides of the shell I are spirally connected with a shell II and a shell III separately, a telescopic rod is arranged in the shell III, a telescopic hose is arranged in the telescopic rod, a sealing ring II is fixedly connected to the bottom wall of the telescopic rod, one end of the telescopic hose communicates with the sealing ring II, and a medicine sprayer used for slowing down blood coagulation is arranged on the side wall of the shell III. According to the hemostatic stent for the cardiac aorta surgery, and a rubber disc is extruded through normal saline, a binding post I can be connected with a connector lug I, so that an electromagnet I is powered on, then, a conductive ball can be separated from a wiring base, a motor can stop working, the situation that blood vessels of a patient are burst due to the fact that pressure in a sealing ring I and the sealing ring II is too high is avoided, and the safety of the patient is facilitated; and meanwhile, the sealing ring I is matched with the sealing ring II, so that blood can be further intercepted, and medical staff can conduct an operation conveniently.

The invention discloses a rubber gasket. The rubber gasket comprises an annular gasket body, wherein the gasket body comprises a first gasket, a second gasket which is positioned at the inner side ofthe first gasket, and an intermediate ring body for connecting the first gasket and the second gasket; a plurality of groups of outer ring holes are uniformly formed around a central axis of the gasket body on the first gasket; each group of outer ring holes includes a first fixing hole in which a bolt penetrates, and a first positioning hole for positioning; the centers of the first fixing holesand the centers of the first positioning holes are on the same circle; a plurality of groups of inner ring holes are uniformly formed around the central axis of the gasket body on the second gasket; each group of inner ring holes include a second fixing hole in which a bolt penetrates, and a second positioning hole for positioning; and the centers of the second fixing holes and the centers of thesecond positioning holes are on the same circle. With the adoption of the rubber gasket, the frequency of adjusting in mounting can be effectively decreased; and the working efficiency can be effectively improved.

The invention relates to the field of engineering machinery, and particularly discloses an underwater construction device boost compensator. The compensator comprises a sensing cavity, a middle cavityand an output cavity, wherein the sensing cavity can be used for sensing external pressure and changing the volume of the sensing cavity, the middle cavity is connected to the sensing cavity and forms a first closed space with the sensing cavity, and the output cavity is separated from the middle cavity through a separation piece, and forms a second closed space independently. According to the compensator, environment pressure is sensed through the sensing cavity, and transmitted to a working device through the middle cavity and the output cavity, and the compensator can adapt to pressure changes in a deepwater operation environment and prevent slurry from polluting engineering equipment.

The invention relates to the technical field of fresh-keeping boxes, and discloses a nitrogen-filled fresh-keeping box for storage and transportation of pickled food. The nitrogen-filled fresh-keeping box comprises a box body and a sealing cover, wherein first through grooves are formed in the periphery of the box body, a first accommodating groove is formed in the groove bottom of the first through groove, a side airbag is arranged at the groove bottom of the first accommodating groove, a first connecting part is arranged on one side of the side airbag, the first connecting part is slidably connected into the first through groove, and a first pressurizing protection device is arranged on the box body and used for extruding the side airbag, so that the size of the side airbag is increased, the first connecting part is pushed to extend out to protect the periphery of the box body, and impact on the whole fresh-keeping box is reduced.

The invention belongs to the technical field of food packaging, storage and transportation, discloses a small-package powder nitrogen-filled packaging device, and aims to overcome the defects in the prior art that the bagging amount of a product is reduced, the sealing property is not good in the nitrogen filling process and a conventional nitrogen filling mode cannot be implemented on a small-size upright packaging machine. The small-package powder nitrogen-filled packaging device comprises a discharge tube, a nitrogen tube I, a collecting hopper, a stirrer, a motor, a metering screw rod, a filling tube, a nitrogen tube II, a flowmeter I, a flowmeter II, a nitrogen tube III and a pull-down sealing device. The invention further discloses a small-package powder nitrogen-filled packaging method. As a small bag weighed 15g or below is filled with nitrogen, the bagging amount is not affected, the air tightness of the packaging bag is not influenced, and the residual oxygen inside the small package can be controlled to be within 3%, the quality of a product inside the small bag can be ensured, and nitrogen filling of the small-size upright packaging machine is implemented.

The invention discloses a nodular cast iron pipeline fixing structure. The nodular cast iron pipeline fixing structure mainly comprises a first nodular cast iron pipeline and a second nodular cast iron pipeline. A connection bearing port is formed in a first nodular cast iron pipeline connector, an inserting and connecting port is formed in a second nodular cast iron pipeline connector, and the inserting and connecting port is inserted in the connecting bearing port. The first nodular cast iron pipeline is provided with a first pipeline clamp and a first check ring which are mutually attached.The first check ring is fixed to the side, facing the connecting bearing port, of the first pipeline clamp. The second nodular cast iron pipeline is provided with a second pipeline clamp and a secondcheck ring which are mutually attached, the second check ring is fixed to the side, facing the inserting and connecting port, of the second pipeline clamp. The first pipeline clamp and the second pipeline clamp are fixed through a fixing block. The nodular cast iron pipeline fixing structure is simple and reasonable in design, the nodular cast iron pipelines can resist axial pull force and transverse pull force through the first pipeline clamp and the second pipeline clamp, and displacement of the nodular cast iron pipelines in any direction is avoided.

The invention discloses a self-sucking gate which comprises a support, a bracket, a framework formed by a top plate, a sealing box, a gate, a cable and a waterproof jacket, wherein the gate comprises a guide rod for guiding and a door plate for water distribution; the door plate is universally articulated with an end part of the guide rod; a movable pulley is arranged at the other end of the guide rod; the top plate is provided with the cable; the cable is wound on the movable pulley and then penetrates through the waterproof jacket arranged at the top of the top plate; the waterproof sealing box surrounds the outer sides of the guider rod and pulley; a guide sleeve is arranged between the guide rod and the sealing box; a sealing ring is arranged on the inner side of the guide sleeve; the door plate is a spherical surface; and the bottom plate is provided with a spherical hole matched with the door plate. Through the technical scheme, the self-sucking gate falls under the effect of the gravity thereof and water pressure when closed; the conical door plate is matched with the conical hole; and the self-sucking gate does not need a driving force, conforms to the fluid mechanics, has long service life due to little abrasion and a simple structure, and is convenient to overhaul.

The invention discloses a biological sample slide moisturizing box for teaching, and relates to the technical field of slide moisturizing. The biological sample slide moisturizing box for teaching comprises a function box; a partition board is fixed inside the functional box; the inside of the functional box is divided into a left water storage cavity and a right recovery cavity by the partition board; the upper part of the left side of the water storage cavity communicates with a water filling port; the lower part of the right side of the recovery cavity communicates with a water dischargingport; the water filling port and the water discharging port are each provided with a shut-off valve; a conduit is arranged outside the functional box; the water storage cavity communicates with the recovery cavity through the conduit; an ultrasonic atomization module, an air pump and a refrigeration piece are fixedly arranged in the water storage cavity; and the upper end of the functional box isfixedly provided with a water pump. The biological sample slide moisturizing box has the advantages that slides can be respectively and independently stored, a circulating continuous low-temperature moisturizing effect is provided, low-temperature moisture is prevented from leaking, the moisturizing effect is good, and the cleaning is easy.

The invention discloses a butterfly valve seat purging structure which comprises a valve seat and a valve body; a purging pipeline with an air inlet is arranged on the valve seat; through holes are formed in the side, close to the valve seat, of the purging pipeline and are formed below the medium circulating direction; and a baffle plate is arranged between the valve body and the purging pipeline. The butterfly valve seat purging structure has the following benefits: all parts of the valve seat are purged through air holes of the purging pipeline, so that the purging effects of all parts of the valve seat are ensured to be consistent, and the situation that the purging effect of certain part is not ideal to cause that the dust media are accumulated on the valve seat to affect the sealingeffect of the valve seat is prevented.