8results about How to "Prevent pressure drop" patented technology

The utility model discloses an air source heat pump system adopting a flash evaporator. The air source heat pump system comprises a compressor, a four-way reversing valve, a water side heat exchanger, the flash evaporator, an electronic expansion valve, an air side heat exchanger, a gas-liquid separator, a first electromagnetic valve, a second electromagnetic valve and a throttling mechanism. During defrosting, if the low pressure is too low, the low pressure can be increased by different amplitudes by controlling the first electromagnetic valve and the second electromagnetic valve, so that the low pressure of the system is controlled to be in a safe area all the time; the compressor is effectively prevented from being abraded in the defrosting process, or the heat exchanger is effectively prevented from frost cracking caused by local icing in the heat exchanger due to too low low pressure in the defrosting process of plate exchange, sleeve and shell and tube heat exchange.

This invention relates to the field of testing equipment technology, specifically a durability testing fixture for motorcycle fuel tank lock discs. It includes a mounting frame, a testing box, a fixed base, and a lock disc body. The testing box has an oil port, and a pressure sensor is installed inside. A proximity switch is installed at the farthest point of the lock tongue's sliding distance. A pressurizing assembly is provided on the testing box, and a piston rod is mounted on the pressurizing assembly. A motor is mounted on the mounting frame, and a push rod is slidably connected to the mounting frame. The motor drives the push rod to push the lock disc body towards the oil port. The piston rod applies gas pressure to the testing box using the rotational force of the lock disc body, and the pressure sensor detects the gas pressure inside the testing box. This avoids the problem of inconsistent testing pressure leading to inaccurate test data in motorcycle fuel tank lock disc sealing performance testing, ensuring the reliability of the test data from this motorcycle fuel tank lock disc durability testing fixture.

The invention discloses an air conditioner control method in an ultralow-temperature and ultralow-load state, which comprises the following steps: when the environment temperature of an outdoor unit of an air conditioner is lower than a first set temperature, determining whether the return air temperature of an indoor unit is lower than a second set value or not; if the return air temperature of the indoor unit is lower than the second set value, whether the air conditioner meets the oil return condition or not is determined; if the air conditioner meets the oil return condition, the air conditioner is controlled to return oil; and after oil return is completed, the air conditioner is controlled to enter a shutdown state.

The invention relates to a condensate pump mechanical seal protection system and a control method thereof, the control method is applied to the condensate pump mechanical seal protection system, and the condensate pump mechanical seal protection system is applied to a nuclear power conventional island demineralized water pipeline system. On the condensate pump mechanical seal protection system, the pressure value of demineralized water in front of a condenser before entering the condenser and the pressure of the condensate pump at a mechanical seal end are respectively detected through a detection device, so that the corresponding pressure values of the demineralized water in front of the condenser when the mechanical seal end is at the lowest pressure value and the highest pressure value are determined; in the subsequent control process, the condensate pump is controlled to work by monitoring the pressure value of the desalted water in front of the condenser, and the pressure of the condensate pump at the mechanical seal end is prevented from being too large or too low; therefore, the complexity of manually and repeatedly detecting the pressure of the mechanical seal end is avoided, the detection precision is improved, the timeliness of pressure detection is ensured, and when the detection result is abnormal, the condensate pump can be controlled by the control device to timely and protectively stop.

This utility model relates to the technical field of building material production equipment, and in particular to an autoclave for aerated concrete panels. The autoclave includes a body with a hinged door at its front end. A movable platform is installed on the bottom surface inside the body, capable of horizontally moving out and inward into the autoclave. A pull rod is provided at the front end of the movable platform. By incorporating steam outlet pipes evenly distributed along the length of the autoclave and opening multiple outlets on them, steam can be evenly released to all areas inside the autoclave, effectively avoiding localized temperature differences caused by uneven steam distribution. This improves the uniformity of the autoclaving process and the consistency of product performance. Furthermore, by installing an electric heating tube at the top of the autoclave, continuous heating of the steam and air inside the autoclave can be maintained after the steam supply stops, helping to maintain a high-temperature, high-pressure environment, preventing pressure drops due to heat loss, and ensuring a stable and controllable autoclaving process.

The invention relates to the technical field of refrigerators, in particular to a refrigerator convenient to disassemble, assemble and maintain, which comprises a cabinet body, an evaporator, a condenser, a compressor, a capillary tube and a separating device for extracting a refrigerant, the separating device comprises a suction mechanism and four reversing mechanisms. By means of the cut-off mechanism in the reversing mechanism, the evaporator or the condenser needing to be disassembled can be isolated from a circulating pipeline of the refrigerator, then the evaporator or the condenser is communicated with the switching mechanism through the reversing mechanism, and then residual refrigerants in the evaporator or the condenser can be pumped out through the suction mechanism; and the refrigerant is temporarily stored on the inner side of the barrel body of the suction mechanism, so that when the evaporator or the condenser is disassembled, the refrigerant left in the evaporator or the condenser can be prevented from leaking outwards, the waste of the refrigerant is avoided, and the environment pollution caused by the leakage of the refrigerant is avoided.

The present invention relates to the technical field of reducers, and in particular to an external sewage discharge device for worm gear reducers. The purpose of the present invention is to provide an external sewage discharge device for worm gear reducers that can quickly discharge sewage. An external sewage discharge device for worm gear reducers includes a main body box, etc.; a connecting frame is installed on the main body box, the connecting frame is in contact with the main body box, a connecting square tube is fixedly connected to the lower side of the connecting frame, an oil outlet pipe is arranged on the side wall of the main body box, the connecting square tube is in contact with the oil outlet pipe, a collecting box is fixedly connected to the front side of the connecting square tube, and the collecting box and the connecting square tube are connected. The present invention realizes faster emptying of the lubricating oil in the main body box by externally connecting this device. When the worm gear reducer is in continuous operation, due to the sliding connection between the worm gear and the worm gear, the mating area between the two parts will experience severe friction, which will accelerate the degree of wear. Accelerating the replacement of lubricating oil can reduce friction and increase service life.