42results about How to "Eliminate pressure differentials" patented technology

The invention provides a flow quantity variable oil pump having two discharge ports and using three rotors. The inventive oil pump maintains pressure property same with that of normal oil pumps and reduces friction at the same time. The inventive oil pump comprises a first discharge passage (11) for supply oil to the engine; a return passage (E) that returns to an intake side of an outer circumferential side rotor (A); a second discharge passage (13) for supplying oil to the engine; a return passage (E) that returns to an intake side of an inner circumferential side rotor (B); and a pressure control valve whose valve main body is provided between a discharge port from the inner circumferential side rotor and the first discharge passage. The first and second discharge passage are coupled, and a flow passage control is executed in each of: a low revolution range in a state in which only the first and the second discharge passage are open; an intermediate revolution range in a state in which the first and second discharge passage are open and a first intake side of the return passage is closed while a second intake side of the return passage is open; and a high revolution range in a state in which the second discharge passage is closed while the first discharge passage and the return passage are open.

This invention relates to a heating / cooling system operating on the basis of a novel SPLIT BUFFER TANK; representing an efficiency improvement alternative to HVAC systems functioning with existing commercial buffer tanks. Currently, commercial buffers have the heat source provider (HSP)-return and system-return discharging to a common buffer / vessel. Novel SPLIT BUFFER is provided with a SEPARATION DISK placed inside the tank as mechanical way of separating the hot water inflow from the HSP from the warmer water inflow from system return. The disk moves up and down along the tank driven by demanded water supply and return. Pump-1 circulates hot water from the hot section of the buffer to the secondary system claiming for heat. Pump-2 circulates warmer water from the warmer section of the buffer through the HSP where it is reheated, and subsequently stored in the hot section of the buffer to reinitiate this cycle again.

The invention discloses an icing test water supply system and a water supply method for aircraft testing, and relates to the technical field of aircraft testing. The water supply system includes an incubator, a heating water tank, a water supply component, a spray component and a control cabinet; , the water supply component includes the water inlet pipe, the main water supply pipe, the return water pipe, the multi-stage high-pressure centrifugal pump and the frequency conversion motor. The frequency conversion motor provides power for the multi-stage high-pressure centrifugal pump. The multi-stage high-pressure centrifugal pump is connected, and the return pipe is respectively connected with the main water supply pipe and the heating water tank; the spray assembly includes a spray rake pipe and a high-pressure nozzle. , and is connected with the spray rake pipe; the control cabinet is electrically connected with each electrical equipment; the system has a reasonable structure design, can realize constant pressure water supply, improve the spray effect of the icing test, and thus improve the aircraft test efficiency.

A soil column leaching device comprises a supporting base, a leaching pipe and a water distributor, wherein the leaching pipe is arranged on the supporting base, and the leaching pipe is connected with the supporting base through threads; the water distributor is connected with the top of the leaching pipe; the leaching pipe consists of an inner pipe and an outer pipe; the inner pipe is positioned inside the outer pipe; the outer pipe of the leaching pipe is divided into an upper part and a lower part which are not communicated with each other; when an air inlet in the upper part of the outer pipe of the leaching pipe is connected with a pump, the pressure of the inner pipe of the leaching pipe of the soil column leaching device can be increased according to experimental needs, so that the time needed by a soil column leaching experiment is effectively shortened; when the soil column leaching device samples a soil layer under the condition that the inner pipe of the leaching pipe of the soil column leaching device is pressurized, an air inlet in the lower part of the outer pipe of the leaching pipe is connected with a pump to increase the pressure outside sampling openings of the soil layer, so that the pressure difference inside and outside the sampling openings can be effectively reduced or even eliminated; at the moment, a sample is taken through a sampling window, so that the occurrence of a wall flow phenomenon and a soil column collapse phenomenon in the sampling process can be reduced.

The invention discloses a spiral separating device. An air inlet tube section (4) is arranged on a spiral casing (1) and a spiral swirl air flue (5) is arranged in the spiral casing (1). The upper part of an assistant cylinder (3) is positioned outside the spiral casing (1) and the upper part of a main cylinder (2) is positioned inside the spiral casing (1). A passage (6) communicated with the inner cavity of the assistant cylinder (3) is arranged on the outer wall of the middle section of the spiral swirl air flue. At least one deflector (7) is arranged in the spiral swirl air flue and at the part of the passage (6), and an air flue (8) communicated with the inner cavity of the main cylinder (2) is arranged on the inner wall of the end section of the spiral swirl air flue. A first nozzle (9a) of a pressure balancing air flue tube (9) is communicated with the upper part of the inner cavity of the assistant cylinder (3) and a second nozzle (9b) is communicated with the upper part of the inner cavity of the main cylinder (2). An air outlet (10) is arranged at the lower part of the main cylinder (2) and a discharge hole (11) is arranged at the lower part of the assistant cylinder (3). A secondary separator (12) is arranged at the first nozzle (9a) and a pressure balancer (13) is arranged at the second nozzle (9b).

A refrigeration and freezing device, comprising a storage drawer (100), an electrolytic oxygen removal assembly (200), a touch sensing device (500) and an electric air valve (300). The electrolytic oxygen removal assembly (200) is used for consuming oxygen in a storage space so that nitrogen-rich oxygen-deficient air is obtained in the space so as to benefit a gas atmosphere for food preservation. The intensity of the aerobic respiration of food, particularly fruits and vegetables, is decreased by means of decreasing the content of oxygen in the storage space, simultaneously ensuring basic respiratory action and preventing the anaerobic respiration of the food, thereby achieving the goal of long-term preservation of the food. When the touch sensing device (500) detects that a user is about to open the storage drawer (100), the electric air valve (300) opens a through hole on the drawer (100) so that the interior and exterior of the storage space communicate, the pressure difference between the interior and exterior of the drawer being eliminated, and thus the problem in which a drawer is difficult to open due to the mounting of the electrolytic oxygen removal assembly (200) is solved; a user may open the storage drawer (100) with less effort, and the usage experience of the user is thus improved.

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 relates to a valve and a pneumatic braking device for pneumatic applications in vehicles, the valve comprising a pressure input (11), a pressure output (12), a switching element (13) and a reset element (15) ), wherein the switching element ( 13 ) is movable between a blocking position and a conducting position, wherein the transition from the conducting position to the blocking position is dependent on the pressure at the pressure input and the reaction of the reset element ( 15 ) force, and wherein the non-return element (18) is integrated into the switching element (13). According to the invention, the non-return element (18) can release the passage in the direction from the pressure input (11) to the pressure output (12) when the switching element (13) is in the blocking position.

Disclosed are a bypass structure, a ventilation device, and a ventilation method, wherein the bypass structure is used for the ventilation device. The bypass structure is disposed in parallel with a primary ventilation structure in the ventilation device. The bypass structure comprises a fresh air bypass passage (8) and a discharge air bypass passage (9), which are independent from each other. The fresh air bypass passage (8) is configured to provide a flow passage for outdoor fresh air flowing through the ventilation device from the outdoor side to the indoor side, and the discharge air bypass passage (9) is configured to provide a flow passage for indoor discharge air flowing through the ventilation device from the indoor side to the outdoor side. A first airflow gate (51) is provided in the fresh air bypass passage (8) and a second airflow gate (52) is provided in the discharge air bypass passage (9), for opening or closing the fresh air bypass passage (8) and the discharge air bypass passage (9), respectively. With the bypass structure, the bypass ventilation efficiency is improved, and a pressure difference between the indoor side and the outdoor side can be eliminated, avoiding unfiltered air from directly entering the indoor side and reducing wear and tear of the primary ventilation structure. The ventilation device and method use the bypass structure in ventilation, reducing wear and tear of the primary ventilation structure.

The invention discloses a laser ablation sampling system, which comprises a first on-off valve, a buffer tank and a fourth on-off valve which are sequentially arranged in the main pipeline from the beginning to the end; The outer chamber and the second on-off valve in the branch pipeline; it also includes a sample chamber and a third on-off valve arranged in the second branch pipeline in sequence from the beginning to the end; the sample chamber is located in the outer chamber; the sample chamber is provided with Relative sample inlet and sample outlet; also includes a sample delivery device arranged in the outer chamber, the sample delivery device includes a sample holder that slidably passes through the sample chamber through the injection inlet and the sample outlet, and is connected with the sample holder And it is used to drive the driving device that the sample support bar slides on the straight line where the sample inlet and the sample outlet are located. The invention realizes the automatic replacement of samples without frequently opening the sample chamber, thus avoiding the influence of frequent opening of the sample chamber on the gas path in the laser ablation sample feeding system.

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.