41results about How to "Eliminate pressure differentials" patented technology

The invention provides a magnetic rotor structure and a power-driven switching valve, wherein the power-driven switching valve comprises a magnetic rotor structure, a valve seat, a slide block, and an outer cover sleeve of the power-driven switching valve; the magnetic rotor structure comprises a magnetic rotor, a shaft and a key; one end of the shaft is arranged in a valve seat bottom hole of the valve seat; the key is used for clamping with a key groove of the slide block; the outer cover sleeve of the power-driven switching valve is sleeved on the valve seat, wherein the distance between the magnetic rotor and the inner wall of the outer cover of the power-driven switching valve is 0.2mm-1.0mm. According to the technical scheme provided by the invention, through the arrangement of the distance of 0.2mm-1.0mm between the magnetic rotor and the inner wall of the outer cover of the power-driven switching valve, and through the arrangement of at least one through hole which is arranged on the magnetic rotor and is communicated with the upper part and the lower part of the magnetic rotor, the technical defect that the normal valve opening of the power-driven switching valve is influenced because of the pressure difference of a medium existing between the upper part and the lower part of the magnetic rotor in the prior art is overcome.

The invention provides a refrigerating device for cold storage. The refrigerating device comprises a storage drawer, an electrolytic oxygen removal component, a touch sensing device and an electric-air valve. The electrolytic oxygen removal component is used for consuming oxygen in air in a storage space, so that nitrogen-rich and oxygen-lean gas atmosphere benefiting food preservation is obtainedin the space. Through reduction of the oxygen content in the gas atmosphere of the storage space, the aerobic respiration intensity of food (especially fruits and vegetables) is reduced, and meanwhile the basic respiration is ensured; anaerobic respiration of the food is avoided, so that the purpose of the long-time preservation of the food is achieved. When the touch sensing device detects thata user is to open the storage drawer, a through hole in the drawer is opened through the electric-air valve, so that the interior and exterior of the storage space communicate with each other; and thedifference between internal pressure and external pressure of the drawer is eliminated, and the problem that the drawer is hard to open due to installation of the electrolytic oxygen removal component is solved. The refrigerating device enables the user to conveniently open the storage drawer in a labor-saving manner, and the user experience is improved.

The invention provides a refrigerating and freezing device. The refrigerating and freezing device comprises a storage drawer, an electrolysis oxygen removal assembly and a pore opening and closing device. The electrolysis oxygen removal assembly is used for consuming oxygen in the air in a storage space, so that rich nitrogen and poor oxygen can be obtained in the space to benefit the gas atmosphere for food preservation. The gas atmosphere can reduce the intensity of aerobic aspiration of food (particularly fruits and vegetables) by decreasing the content of oxygen in the storage space, ensure basic respiratory action and prevent anaerobic respiration of the food, so that the purpose of long-term preservation of the food is achieved. According to the refrigerating and freezing device, when a user is about to open the storage drawer, the pore opening and closing device can open a pore, arranged in a grabbing groove, of the device, so that the inside and the outside of the storage spacecan be communicated, the pressure difference between the inside and the outside of the drawer can be eliminated, and the problem that the drawer is difficult to open due to mounting of the electrolysis oxygen removal assembly is solved. The user can open the storage drawer more effortlessly, and the use experience of the user is improved.

The invention relates to a precision pressure control system and a hydraulic machining method of a servo pump control hydraulic machine. The hydraulic machine comprises a medium-flow servo pump and alarge-flow servo pump driven by a servo motor, outlet pipelines of two pumps are connected with a main cylinder upper cavity oil way through a seventh dynamic valve, and the main cylinder upper cavityoil way is further connected with an oil tank through a fourth dynamic valve and a proportional valve; a main cylinder lower cavity pipeline is connected with an outlet of a ninth cartridge valve, aninlet of the ninth cartridge valve is connected with the oil tank through a fifth cartridge valve and an eighth cartridge valve, the fifth cartridge valve supplies supporting force during deceleration and pressurization through an overflow valve, and the eighth cartridge valve is turned on during the return stroke. In hydraulic machining, each working cycle comprises the following actions of automatic pressure compensation for an energy accumulator, pressure supplementation stopping for the energy accumulator, rapid descending of a sliding block, deceleration pressurizing of the sliding block, pressure maintaining of the sliding block, pressure relief of the sliding block, and return and stopping of the sliding block. The servo driver is switched in two modes of flow control and PID regulation control, stable pressurization of the sliding block is achieved, the phenomenon that a part deforms due to pressurization overshoot is avoided, and pressure relief is stable.

The invention discloses a vacuum screen printing machine hole plugging pad plate jig. The vacuum screen printing machine hole plugging pad plate jig comprises a printing table plate and an air guide pad plate; the printing table plate is arranged in a printing cavity of a vacuum screen printing machine, a plurality of aluminum pad strips are arranged on the printing table plate, and a printing area is formed by the aluminum pad strips; a plurality of air guide holes are formed in the air guide pad plate, the air guide pad plate is placed on the aluminum pad strips, the four corners of the air guide pad plate are fixed through double-face pins, and a PCB is sleeved with the double-face pins to be positioned; the air guide pad plate is supported by the aluminum pad strips, an air guide channel is formed between every two aluminum pad strips, air enters the air guide holes from the air guide channels, and the pressure difference of the two faces of the PCB is removed. Compared with an existing printing table plate adopting a special air guide pad plate or provided with an air guide groove, the jig is simple in structure, convenient to use and low in cost, the jig is shared by PCBs of different types, efficiency is high, and operation is convenient; and the jig can further be directly used in common with a non-vacuum hole plugging air guide pad plate.

The invention discloses a self-balance floating sealing device for solving the technical problem of weak sealing performance of a traditional sealing device. The self-balance floating sealing device comprises a rotating shaft, sealing rings, outer O-shaped rings, inner O-shaped rings, a shell, hydraulic oil, a red copper pad and a screw. The number of the sealing rings is two; the outer O-shaped rings are positioned in inner clamping grooves of the sealing rings; the inner O-shaped rings are positioned in outer clamping grooves of the sealing rings; the two sealing rings are arranged between the rotating shaft and the shell in a sleeving manner; the sealing rings can move along the axis of the rotating shaft; a sealing cavity is defined by the two sealing rings, the shell and the rotating shaft, and is communicated with an oil injecting hole in the shell; the oil injecting hole is sealed by the red copper pad and the screw; and the hydraulic oil is injected in the sealing cavity through the oil injecting hole in the shell. Along with the pressure change, the volume of the sealing cavity is changed through the translation of the sealing rings to form self-balance with external water pressure, so that the pressure difference of the two sides of the outer O-shaped rings and the inner O-shaped rings is eliminated, and the sealing reliability is guaranteed.

The invention discloses a pressure balance control method and device for a blast furnace coal injection system. The method includes the steps that a blowing tank A at the last phase in the braize blowing sub-process stable blowing state is connected with a blowing tank B in a blowing waiting state through a connecting pipe by opening a first stop valve and a second stop valve at the same time; and when the pressure difference deltaP between the blowing tank A and the blowing tank B is extremely small, the absolute value of a difference of PTA and PTB is smaller than or equal to deltaP, the first stop valve and the second stop valve are closed at the same time, and pressure balance control is completed. The pressure balance control device comprises the blowing tank A and the blowing tank B which are sequentially communicated through the connecting pipe, and the connecting pipe is sequentially provided with the first stop valve and the second stop valve. According to the pressure balance control method and device, the pressure difference between the blowing tank A and the blowing tank B is controlled through the first stop valve and the second stop valve, pressure balance between the blowing tank A and the blowing tank B is achieved, shortcomings such as pressure fluctuation, the hysteretic nature, overregulation or under-regulation in the prior art can be eliminated, and the pressure balance control method and device have the remarkable economic benefit on stable production of a blast furnace.

The invention discloses a face mask box, an oxygen injector, and a face mask kit comprising both. The face mask box includes: a face mask container provided with an internal space; a face mask sheet,placed in the internal space of the face mask container and has a shape corresponding to the face; gel essence liquid, filling the internal space of the face mask container for soaking the face mask;a box base, which seals one side of the face mask container and is combined with same; a lid, sealing the other side of the face mask container and being detachably combined with same; an oxygen supplying needle, which is fixed by and supported on the box base and is provided with a central hole; an oxygen capsule bracket, which is combined movably in the direction of closed to the oxygen supplying needle and the direction opposite to the same; and an oxygen capsule which is loaded on the oxygen capsule bracket by facing to the oxygen supplying needle, air filling the oxygen capsule under highpressure.

The invention discloses an eye drop filling control device without a pollution source. The eye drop filling control device comprises a large tank, a first filter, a second filter and a filling machine which are connected in sequence by a conveying pipe, and further comprises a controller, an electronic balance and a buffering tank, wherein the buffering tank is arranged on the electronic balance and is connected between the second filter and the filling machine, a solenoid valve is arranged at the input port of the buffering tank, the electronic balance is electrically connected with the input end of the controller, and the solenoid valve is electrically connected with the output end of the controller; and the controller is internally provided with an eye drop stock upper limit value for enabling the controller to send out a signal to switch on the solenoid valve when the weighing value of the electronic balance is smaller than the value, and an eye drop stock upper limit value for enabling the controller to send out a signal to switch off the solenoid valve when the weighing value of the electronic balance is greater than the value. The electronic balance arranged at the bottom of the buffering tank is used for metering eye drops in the buffering tank, so that the pollution source generated by adding a metering device is avoided, and the eye drops are filled under a sterile environment.

The invention discloses a device for efficiently obtaining air lift through low-density gas. The device can be used for upgrading lift systems of airships and fire balloons and promoting the large-lift and miniaturization development of the airships and the fire balloons. According to the device, the influence of density parameters on moving fluid pressure intensity changes is emphasized substantially, and the natural quality of the low-density gas is used for easily achieving the airflow density difference between the upper face and the lower face of a rotary part, so that excellent conditions are created for generating lift for the rotary part. When the rotary part rotates at a high speed, the lift is naturally formed. The effect is achieved through cooperative operation of the rotary part, a wind blocking part, an air pressure adjuster, an internal heater, an external heater and other parts.

The invention relates to a balanced valve element structure, which comprises an upper valve element, a check ring, a valve rod and a lower valve element; a first groove is arranged at the upper end of the upper valve element, a containing groove is annularly arranged on the side wall of the first groove, the outer ring of the check ring is clamped in the containing groove, and a first cavity is formed by the first groove and the check ring; a first through hole is axially arranged at the bottom of the first groove in a penetrating manner; the valve rod comprises a first part and a second part, and the first part penetrates through the inner ring of the check ring; the second part is arranged in the first cavity and divides the first cavity into a first upper cavity and a first lower cavity; a second through hole is arranged on the second part of the valve rod in a penetrating mode and communicated with the first upper cavity and the first lower cavity; the valve rod can move downwards relative to the upper valve element to block an upper end opening of the first through hole and can also move upwards relative to the upper valve element to open the upper end opening of the first through hole, so that the first through hole is communicated with the first lower cavity; and the lower valve element is connected to the lower end of the upper valve element, a third through hole is axially arranged on the lower valve element in a penetrating mode, and the third through hole is communicated with the first through hole.