130results about How to "Easy to seal the connection" patented technology

An disposable air bag for measuring blood pressure having a diaphragm and a nipple mounted therein, the diaphragm having a plurality of waves for allowing the diaphragm to expand easily out of the air bag and a clip for disconnecting and connecting the nipple to and from one end of an air hose the other end of which is connected to an electronic blood pressure measuring device.Also disclosed is a blood pressure measuring device having ABS storing means for storing the stretching characteristics of an air bag as a function of the air volume in the air bag, AABPOA calculating means for calculating the actual pressure on the artery, and systolic / diastolic algorithm calculating means for determining the systolic and diastolic blood pressures partially based on the AABPOA calculating means.

The invention discloses a washing machine. The washing machine comprises a box body, a rotating barrel, and a water guide cover, wherein the rotating barrel is rotationally arranged in the box body; the circumferential wall and / or the bottom wall of the rotating barrel are / is provided with a water outlet; the water guide cover is arranged on the inner peripheral wall surface of the rotating barrel and covers the water outlet, and the water guide cover is provided with a water inlet and defines a water guide cavity communicated with the water inlet and the water outlet; liquid which rises due to the centrifugal force action of the rotating barrel enters the water guide cavity through the water inlet and is discharged from the water outlet. According to the washing machine, the single-barrel structure is used, the capacity is large, water is saved, pollution is avoided, and the cost is low; the material of the box body is not limited under the condition that the dewatering effect is guaranteed, the diversity of the appearance is improved, and sealing is facilitated.

The invention discloses a pumping system and a distributing valve thereof, and concrete transporting machinery. The distributing valve of the pumping system comprises a first valve body plate, a second valve body and a rotatable valve plate, wherein the first valve body plate and the second valve body are respectively in sliding matching with two surfaces of the valve plate; the distributing valve has two states, in the first state, a first sucking hole is communicated with a material container through a first passing communicating hole, and a second discharging hole is communicated with a second pumping hole through a second passing communicating hole; and in the second state, a second sucking hole is communicated with the material container through a passing communicating hole, and a first discharging hole is communicated with a first pumping hole through the other passing communicating hole or the first passing communicating hole. The valve plate of the distributing valve does not need to rotate in a hopper, and the distributing valve does not need to be matched with an opening hopper for use; meanwhile, the state conversion of the distributing valve is realized through the rotary valve plate, a driving force required by the distributing valve during state conversion is greatly reduced, and the energy consumption of the distributing valve can be reduced.

The invention relates to a method and an injection unit which is movable on runners (6) of the frame (7) of an injection molding machine with the aid of a running gear (40) and comprises a drive unit (10, 23) for axially displacing and pressing the plasticizing cylinder (2) to the injection mold. According to the invention, the tip (16) of the plasticizing cylinder (16) is adjusted on both a vertical and a horizontal plane via a slight rotary movement of the entire injection unit (1) prior to the production if the concentric sealing connection to the injection port (17) of the mold is insufficient. The inventive injection unit (1) is supported via a support (5) that is disposed so as to be movable on the frame (7) of the injection-molded part while being provided with an individual drive unit (10, 23) via which the plasticizing cylinder (2) can be pressed to the injection mold so as to create a concentric sealing connection thereto.

A detachable automatic vacuum storage container comprises a box body and a vacuum control device, the box body being provided with a vacuumizing channel, and the vacuum control device being connected with the vacuumizing channel in a removable manner; one end of the vacuumizing channel is connected to the inner chamber of the box body, and the other end is provided with a sealing joint. The vacuum control device is provided with a suction nozzle, when the vacuum control device is connected to the vacuumizing channel, the suction nozzle is inserted and connected to the sealing joint in an airtight way; when the air pressure of the inner chamber of the box body is higher than the preset threshold, the vacuum control device can pump the air to maintain the inner chamber of box body in a vacuum state.

The invention relates to a refrigerating module for a refrigeration and freezing device and the refrigeration and freezing device. The refrigerating module comprises an evaporator box assembly, a bottom supporting plate and a lifting mechanism, wherein the top of the evaporator box assembly is provided with an air supply port and an air return port; the bottom supporting plate is used for bearingthe evaporator box assembly; the lifting mechanism comprises at least one lifting unit; each lifting unit comprises at least one wedge-shaped part and an operation rod; each wedge-shaped part is movably arranged on the bottom supporting plate and is provided with a wedge-shaped surface which is used for being abutted against the evaporator box assembly; the operation rod is configured to operatively push or pull at least one wedge-shaped part to move it on the bottom supporting plate, so that the wedge-shaped surface of the wedge-shaped part is used for lifting and / or dropping the evaporator box assembly. The refrigeration and freezing device comprises at least one storage module, a rack and the refrigerating module, wherein the rack is used for supporting at least one storage module; theat least one storage module is arranged on the rack; the refrigerating module is arranged inside the rack and is located below at least one storage module.

The invention discloses a separable type automatic vacuum pumping storage container. The separable type automatic vacuum pumping storage container comprises a box body and a vacuum control device, wherein a vacuum pumping passage is formed in the box body; the vacuum control device is detachably connected with the vacuum pumping passage; one end of the vacuum pumping passage is communicated with an inner cavity of the box body; a sealing joint is arranged on the other end of the vacuum pumping passage; the vacuum control device is provided with a gas pumping nozzle; the gas pumping nozzle is inserted in the sealing joint and is in air-tight connection with the sealing joint when the vacuum control device is connected with the vacuum pumping passage, and the inner cavity of the box body is enabled to keep a vacuum state by the vacuum control device by pumping gas when the air pressure of the inner cavity of the box body is greater than a preset threshold value. Compared with an existing vacuum storage box, the separable type automatic vacuum pumping storage container disclosed by the invention has the advantages that more effective vacuum pumping can be realized, and the vacuum degree in the box body can be better maintained; more convenience is realized when the separable type automatic vacuum pumping storage container is used by a user, and the requirements on vacuum pumping or vacuum releasing can be realized without too much operation.

The invention discloses an energy storage device. The energy storage device comprises an energy conversion element, a shell and a terminal; the energy conversion element is provided with at least oneelectric connection part arranged on a surface of the energy conversion element; the shell is made of an insulating material, a cavity is formed in the shell, the shell comprises a first half shell and a second half shell which are connected together in a sealed mode, and at least one of the first half shell and the second half shell comprises a concave structure and an edge part which is formed by extending outwards around the edge of the concave structure; a windowing structure is arranged on the concave structure; and the terminal is a sheet structure, the edge of at least one surface of the terminal is connected with the windowing structure in a sealed mode, and an electric connecting part makes contact with an inner surface of the terminal. One technical effect of the invention is characterized in that the energy conversion element is electrically connected with an external portion through the terminal, the terminal and the shell form sealed connection, and when pressure in the shell is increased, the pressure can be released at a sealed connection part of the two; and moreover, the shell made of plastic is adopted so that safety and explosion-proof performance are superior tothat of a steel shell.

The invention belongs to the technical field of textile, and especially discloses a textile air permeability detection device. The textile air permeability detection device is used for solving problems in the prior art that detection of conventional textile air permeability detection devices is inconvenient, and operation is complex. The textile air permeability detection device comprises a bottomplate; the top of the bottom plate is provided with a protective cover; a bottom platform which is fixedly connected with the bottom plate is arranged in the protective cover; the top part of the bottom platform is provided with a cylindrical air inlet channel; the bottom plate is provided with a gas inlet pipeline communicated with the cylindrical air inlet channel; a driving mechanism is arranged right above the bottom platform, and is fixedly connected with one side of the internal side wall of the protective cover; a placing bottom plate is arranged on the driving mechanism in parallel tothe bottom platform; the top of the placing bottom plate is provided with a butt joint channel designed to penetrate the placing bottom plate. The textile air permeability detection device is simplein structure; operation is convenient and rapid; cloth unloading is convenient and rapid; and effective cloth air permeability detection can be realized.

The invention discloses a medical visible inpatient ward humidifying, heating and disinfecting system which comprises a base, a supporting frame plate and a horizontal supporting plate. A central processor is installed on the upper portion of the base; a fixing plate is arranged above the central processor; an extension pipe is fixed to the front side of the supporting frame plate; the supportingframe plate is located in the middle of a supporting rod; a traveling groove is formed inside the horizontal supporting plate; and the horizontal supporting frame is located below a fan. According tothe medical visible inpatient ward humidifying, heating and disinfecting system, the position height of the supporting frame plate on the supporting rod can be adjusted through cooperation of the supporting rod and the supporting frame plate, the overall lengths of a protective sleeve and a detection rod are changed, the outer protective sleeve plays a role in protecting temperature sensors and humidity sensors on the detection rod, the multiple temperature sensors and the multiple humidity sensors can be exposed outside at the same time when the supporting frame plate ascends along the supporting rod, and when the supporting frame plate descends along the supporting rod, the temperature sensors and the humidity sensors can be stored into the protective sleeve.

The invention relates to a refrigeration module for a cold storage and refrigerating device and the cold storage and refrigerating device. The refrigeration module comprises an evaporator box assembly, a bottom support plate and a lifting mechanism. The top of the evaporator box assembly is provided with an air supply opening and an air return opening. The bottom support plate is used for bearingthe evaporator box assembly. The lifting mechanism is provided with at least one lifting unit. Each lifting unit comprises a cam located under the evaporator box assembly, the circumferential curved face of the cam abuts against the bottom of the evaporator box assembly, and the cam is arranged to operationally rotate in the vertical plane relative to the bottom support plate so as to lift and / ordrop the evaporator box assembly. The cold storage and refrigerating device comprises at least one storage module, a rack used for supporting at least one storage module, and the refrigeration module.At least one storage module is arranged on the rack, and the refrigeration module is arranged in the rack and is located below at least one storage module. The refrigeration module can be in seal connection with the storage module and is convenient to disassemble and assemble independently.

The invention provides a DPF (Diesel Particulate Filter) installing frame of a DPF cleaning device. The DPF cleaning device comprises a container and a cover used for sealing the container. The DPF installing frame comprises a locking mechanism and an installing frame baseplate, wherein a through hole communicated with a DPF hole channel is formed in the installing frame baseplate; the installingframe baseplate is connected to and fixed to the inner wall of the container in a sealing manner; the locking mechanism is connected to and fixed to the installing frame baseplate or the container; the locking mechanism is used for squeezing a PDF to be connected to and fixed to the installing frame baseplate in a sealing manner; a sealing adjusting plate is arranged between the DPF and the installing frame baseplate; the locking mechanism is connected to and fixed to the installing frame baseplate; when the container contains the DPF, the container is divided into a first cavity and a secondcavity by the DPF; the first cavity is used for being connected to a high pressure air source; and the second cavity is used for being connected to atmosphere by an air blast quick opening valve.

The invention discloses a PPR temperature control filter valve with a meter. The PPR temperature control filter valve with the meter is characterized by comprising a valve body, a valve is arranged at the water inflow end of the valve body, the temperature pressure meter is arranged at the water outflow end, an obliquely-arranged sewage drainage pipe is arranged between the temperature pressure meter and the valve, the sewage drainage pipe inclines by 30 degrees to 60 degrees, a filter screen is arranged in the sewage drainage pipe, a sewage drainage union with a plug cap is arranged at a port, an independently-arranged small valve is arranged on the sewage drainage pipe, and the sewage drainage pipe and the valve body are integrally formed. According to the PPR temperature control filter valve with the meter, sewage is drained conveniently, overall leakage points are reduced, and service life is prolonged.

The invention provides a metal filter bag sealing connection device and a bag type dust collector. The metal filter bag sealing and connecting device comprises: a tubesheet, a metal filter bag; a sealing connector; a first bolt which penetrates through the head cover of the metal filter bag and is in threaded connection with the sealing connector; a first sealing element which is arranged between the head cover and the sealing connector; a second sealing element which is arranged between the sealing connector and the tubesheet; a flange plate which is arranged below the tubesheet; and a second bolt which is connected with the flange plate and the sealing connector. The invention solves the problem of sealing when the metal filter bag is mounted on the tubesheet of a bag type dust collector, and avoids the problems of flue gas leakage and excessive flue gas emission caused by non-sealing mounting; the invention also solves the problem that the mounting perpendicularity of the metal filter bag is influenced due to tubesheet deformation caused by welding a stud on the tubesheet conventionally; and in addition, the metal filter bag is positioned by adopting a bag opening and the flange plate, so that the coaxiality of the filter bag and a tubesheet hole is ensured, and meanwhile, the problems of scratching and damage to a surface filter structure of the filter bag when the metal filter bag is mounted are avoided.

The invention belongs to the technical field of underwater cable sealing installation and relates to a glue pouring type insulating sealing butt joint method for underwater cable connection. The method includes the steps that firstly, a number I plug and a number II plug which are matched are connected with the two ends of a sealed pipe respectively, two cable connectors obtained after repairing or shearing penetrate into the sealed pipe from exterior to interior from the number I plug and the number II plug, and after the two cable connectors are connected according to a standard cable connection requirement when the number I plug and the number II plug are opened in a twisting mode, binding and winding straps are used for winding and binding; secondly, the bound cable connectors are arranged in the middle of the sealed pipe, and a number I wire penetrating hole and a number II wire penetrating hole in the two ends of the sealed pipe are sealed through SR plastic filler; then sealing glue is poured in the sealed pipe so that gaps between the exteriors of the binding and winding straps and the sealed pipe can be filled with the sealing glue, and finally the number I plug and the number II plug are screwed so that the interior of the sealed pipe are sealed as a whole. The method has good sealing performance, insulating performance and durability, operation is easy and convenient, cost is low, and the application range is wide.

The invention relates to a refrigeration module for a refrigerating and freezing device and the refrigerating and freezing device. The refrigeration module comprises an evaporator box assembly and a bottom support plate, wherein a supply-air outlet for enabling air currents in the evaporator box assembly to flow out of the evaporator box assembly and a return air inlet for enabling external air currents to flow into the evaporator box assembly are arranged at the top of the evaporator box assembly; and the bottom support plate is used for bearing the evaporator box assembly. The evaporator boxassembly is configured to be movably arranged on the bottom support plate in the vertical direction; when the evaporator box assembly moves upwards, the supply-air outlet tightly communicates with anair supply duct of a storage module which is arranged above the refrigeration module and adjacent to the refrigeration module, and the return air inlet tightly communicates with an air return duct ofa storage module which is arranged above the refrigeration module and adjacent to the refrigeration module; and when the evaporator box assembly moves downwards, the refrigeration module is separatedfrom the storage module. The refrigerating and freezing device comprises at least one storage module, a frame for supporting the at least one storage module, and the refrigeration module. The at least one storage module is arranged on the frame; and the refrigeration module is arranged in the frame, and is positioned below the at least one storage module.

The invention relates to an experimental device for observing superconducting transition of a superconductor. The experimental device comprises a cavity structure, a safety value, an electric connecting joint, a vacuumizing and pressure maintaining mechanism, a connecting pipe, a conductive part and an experimental cylinder, wherein four connectors are arranged on the cavity structure, and the four connectors are respectively a connector A, a connector B, a connector C and a connector D; the safety valve is in sealing connection with the connector A; the electric connecting joint is arranged at the connector B in a sealing manner; the vacuumizing and pressure maintaining mechanism is in sealing connection with the connector C, and is used for vacuumizing the whole leak rate detection device and controlling and maintaining the pressure; the connecting pipe is a pipe body with openings at the two ends, one end of the connecting pipe is in sealing connection with the connector D and a placing frame used for installing a superconductor is arranged at the other end of the connecting pipe; the conductive part penetrates through the cavity structure and the interior of the connecting pipe, and the two ends of the conductive part are electrically connected to the electric connecting joint and the superconductor respectively; and the experimental cylinder is a cylinder body with an opening at one end, the experimental cylinder sleeves the placing frame, and the opening of the experimental cylinder is in sealing connection with the other end of the connecting pipe. The experimental device has the advantages that the structure design is simple, the operation is easy, the device cost is low, and the superconducting transition of the superconductor can be effectively studied and observed.

The invention relates to a pressurizing and oxygenating modular human residential building group in a high-altitude area. The group adopts modular design and comprises a plurality of standard cabins, a connecting node cabin, a connecting aisle cabin, a transition cabin, an equipment cabin, a sewage collecting cabin and large-span space module units, wherein the module units can be freely assembled in the plane direction and the vertical direction and can be freely expanded in function; the standard cabins are used for various functional scene requirements; the connecting node cabin and the connecting aisle cabin are used for space communication and personnel traffic between the standard cabins, between the standard cabins and the transition cabin and between the standard cabins and the large-span space; the transition cabin is used for building group indoor and outdoor pressure transition and personnel access; an intelligent pressurizing and oxygenating system is arranged in the equipment cabin; the sewage collecting cabin is used for collecting and treating sewage and waste in the building group; and the large-span space is used for meeting the requirements of large-scale meetings, large-scale gathering and sports of multiple groups of people. According to the invention, the design requirements of larger space scale, higher supercharging capacity, more living functions and lower-cost operation are met.

The invention discloses a wheel chair type putting-on free excrement automatic cleaning machine. A wheel chair is provided with a completely-automatic processor and adaptive pants; the completely-automatic processor is provided with an excretion channel, an excrement collection device, a negative pressure device, a positive pressure device, a hot water device, a hot air device and a control device; the adaptive pants are provided with an excrement collection region at the crutch, the excrement collection region is internally provided with an excretion hole, an inflation pipe, a hot water output pipe and a hot air output pipe; the inlet end of the excretion channel is connected with the excretion hole of the collection region, the outlet end of the excretion channel is connected with the collection device, the collection device is connected with the negative pressure device; and the positive pressure device, the hot water device and the hot air device are respectively and correspondingly connected with the inflation pipe, the hot water output pipe and the hot air output pipe in the collection region through pipelines. Due to adoption of the wheel chair type putting-on free excrement automatic cleaning machine disclosed by the invention, a user can excrete at any time so that the movement range is greatly increased, and needs no help of others during excreting and cleaning because the putting-on free automatic cleaning mode is convenient for use.

The invention relates to a refrigeration module for a cold storage and refrigerating device and the cold storage and refrigerating device. The refrigeration module comprises an evaporator box assembly, a bottom support plate and a lifting mechanism. The top of the evaporator box assembly is provided with an air supply opening and an air return opening. The bottom support plate is used for bearingthe evaporator box assembly. The lifting mechanism is provided with at least one lifting unit. Each lifting unit comprises a crankshaft located under the evaporator box assembly, the crankshaft is arranged to operationally rotate so as to lift and / or drop the evaporator box assembly directly or indirectly, and the air supply opening and the air return opening is enabled to communicate with or be separated from a corresponding air channel of a storage module in a sealed mode. The cold storage and refrigerating device comprises at least one storage module, a rack used for supporting at least onestorage module, and the refrigeration module. At least one storage module is arranged on the rack, and the refrigeration module is arranged in the rack and is located below at least one storage module. The refrigeration module can be in seal connection with the storage module and is convenient to disassemble and assemble independently.

The invention relates to a device (1) comprising a fastening part (2) for a lock housing (3), wherein an electrical connection to the lock housing (3) can be implemented through an opening (4) of the fastening part (2) from a first side (5) of the fastening part (2), wherein the lock housing (3) has an external plug (7) that is positioned at a distance to the fastening part (2) and at the circumference (8) of which a flexible collar (9) is fastened. For this purpose, the fastening part (2) in particular constitutes a boundary between a dry chamber (14) and a wet chamber (13) in a motor vehicle door (12), wherein the electrical connection to the lock housing (3) is positioned in the wet region (13).

The invention discloses a device convenient for drinking and storing easy-opening canned beverages. The device is characterized by comprising a bottle hood body and a bottle cap, wherein the lower end of the bottle hood body is provided with a fastening structure connected with the upper part of an easy-opening can; the fastening structure comprises a surrounding plate and a fastening body; the surrounding plate extends downwards along the inner side of the edge on a can cap of the easy-opening can; the fastening body is fastened on the flanging of the edge on the can cap of the easy-opening can; the bottom end of the surrounding plate is arranged in a ring-shaped groove at the inner side of the edge on the can cap of the easy-opening can in an abutting manner; the lower end of the fastening body is arranged on the ring-shaped surface at the lower end of the flanging of the edge on the can cap of the easy-opening can in an abutting manner; and the bottle cover is in sealing connection with the upper end of the bottle hood body. In the device, the structure similar to the bottled beverage is adopted; and after the easy-opening can is uncapped, the bottle hood body and the fastener of the easy-opening can are well connected in a sealing manner, the easy-opening canned beverage can be drunk like the bottled beverage, and the remained easy-opening canned beverage is sealed and stored by the bottle hood body and the bottle cap to avoid from being contacted with the air. The device is clean and sanitary, reduces unnecessary waste, and is simple and convenient with full personality.

The invention discloses an energy storage device and an assembling method thereof. The energy storage device comprises an energy conversion element and a shell; the energy conversion element is provided with at least one electric connection part arranged on the surface of the energy conversion element; the shell comprises a conductor layer and at least one insulating layer which are compounded together; a cavity is formed in the shell, at least one insulating layer is located on one side of the cavity, a hollow structure is arranged on the insulating layer located on one side of the cavity, the conductor layer is exposed on the hollow structure to form a contact part, and the electric connection part is connected with the contact part; the shell comprises a first half shell and a second half shell which are connected together in a sealing manner, and at least one of the first half shell and the second half shell comprises a concave structure and an edge part which is formed by extending outwards around the edge of the concave structure; and a hollow structure is arranged on the concave structure. The energy storage device is simple in structure, and edge sealing and bending are easy to achieve.

The invention relates to a refrigeration module for a refrigerating and freezing device and the refrigerating and freezing device. The refrigeration module comprises an evaporator box module providedwith an air supply port and an air return port at the top, a bottom support plate for bearing the evaporator box module, and a lifting mechanism provided with at least one lifting unit; each lifting unit comprises at least one wedged block set and an operation mechanism, wherein each wedged block set comprises a fixed wedged block and a movable wedged block; the movable wedged blocks and the fixedwedged blocks are matched through wedged surfaces; and the operation mechanism operatively drives the movable wedged blocks to move on the bottom support plate, so that the fixed wedged blocks move in the vertical direction to hoist and / or drop the evaporator box module. The refrigerating and freezing device comprises at least one storage module, a frame for supporting the at least one storage module, and the refrigeration module. The at least one storage module is arranged on the frame; and the refrigeration module is arranged in the frame, and is positioned below the at least one storage module.

An energy storage system for vehicle comprising a lower housing (3) and an upper housing (5) connecting with each other; and a plurality of battery modules connected in an internal space defined by the lower housing (3) and the upper housing (5), and connected in serial or in parallel to supply power to a battery-power driven motor of the vehicle. It is possible to establish a good seal connection between the lower housing (3) and the upper housing (5) of the energy storage system.

The invention provides a water-saving type hand washing machine. The water-saving type hand washing machine comprises a water flushing device, an electrical control device, a water storage device, a waste water collecting system, a waste water purifying system and a recycling device, wherein the water storage device comprises a water storage tank; a water outlet tube is arranged on the water storage tank and is connected with a flushing switch on the water flushing device; a hand washing sink is arranged below the water outlet tube; the lower part of the hand washing sink is connected with a flushing drainage tube; the tail end of the flushing drainage tube is connected with the waste water collecting system; the waste water collecting system comprises a circulating water tank; the waste water purifying system is arranged between the flushing drainage tube and the circulating water tank, and comprises a purifying filter element and a purifying pipeline; a water inlet end of the purifying filter element communicates with the flushing drainage tube; a water outlet end of the purifying filter element communicates with the purifying pipeline; and the purifying pipeline communicates with the circulating water tank. The water-saving type hand washing machine does not need to be connected with a running water pipe network for water supplying, and recycling of water is realized.

The invention discloses a breast pump. The breast pump comprises a main machine and a three-way assembly, wherein an inserting groove of the main machine is connected with an inserting part of the three-way assembly in an inserted mode; the three-way assembly comprises a suction cylinder shell and a suction piston installed in an inner cavity of the suction cylinder shell; the suction piston is used for dividing the inner cavity of the suction cylinder shell into an internal cavity communicating with a milk suction channel and a suction cavity communicating with a suction pump of the main machine; an air vent communicating with the suction cavity is formed in the suction cylinder shell; a suction opening communicating with the suction pump is formed in the inserting groove of the main machine; and a horn-shaped sealing ring is arranged at the suction opening, so that after the three-way assembly is inserted in place, the horn-shaped sealing ring can cover the air vent and is compressedto be tightly attached to the outer surface of the suction cylinder shell. The breast pump can effectively solve the problem of poor assembling effect of the three-way assembly and the main machine of an existing breast pump.

The invention relates to a small-leakage-rate positive-pressure leakage hole calibration method which comprises the following steps: arranging a calibration chamber and a reference chamber made of thesame material as the calibration chamber, and separating the calibration chamber from the reference chamber by a differential pressure film gauge and a stop valve; the gas quantity Q.t being in direct proportion to the reading P of the differential pressure film gauge, so that a formula can be obtained, wherein Q represents the leakage rate, t represents the time, and k is equal to P0* x.A / (P2-P1); arranging a piston in the calibration chamber, and calculating the volume coefficient k by measuring the pressure difference caused by pushing the piston, the pressure difference being equivalent to the amount of gas flowing into the leakage hole, wherien the A is the sectional area of the piston, x is the moving distance of the piston, and P1 and P2 are indicating values of the film meters before and after the piston moves; and measuring the change rate of the pressure P along with the time t caused by the fact that the hole to be detected flows into the calibration chamber, thereby obtaining the leakage rate of the hole to be detected.

The invention discloses a micro-nozzle and a fabrication method thereof. A capillary tube of the micro-nozzle consists of a micro-pipe and a transitional pipe, and is embedded into one end of a plastic pipe; the micro-pipe is communicated with the environment outside the nozzle; the transitional pipe is communicated with the inner cavity of the plastic pipe; and the inside diameter of the transitional pipe is reduced gradually. The fabrication method of the micro-nozzle does not need to adopt micro-electromechanical processing technology and has fewer operating steps,,and common mechanical technicians can operate technologies such as die casting and corrosion and the like; therefore, the method is simple and reliable, and are easy to learn and master by operators; the circular-section plastic pipe of the micro-nozzle forms a fluid inlet tank which delivers fluid to the micro-pipe, simultaneously, macro-connection is formed between the fluid-inlet system and the capillary pipe so as tofacilitate the sealed connection with the common circular-section macro-fluid inlet pipes. Without any bending angles, fluid channels in the micro-nozzle are communicated straightly, which is easy for sample introduction, cleaning and drying.