35results about How to "Reduce the impact of tightness" patented technology

The invention discloses a shaft sealing device. The shaft sealing device comprises a rotating shaft, a maze inner sleeve, a clamping ring, hard sealing rings, partition rings, soft sealing rings, a maze outer sleeve and a sealing ring base. An annular groove is formed in the middle of the maze inner sleeve. The inner edge of the clamping ring is embedded in the annular groove and fixed to the outer edge of the middle of the maze inner sleeve. A boss is arranged on the outer edge of the bottom of the maze inner sleeve. The hard sealing rings, the partition rings and the soft sealing rings are sequentially arranged and fixed between the clamping ring and the boss on the outer edge of the bottom of the maze inner sleeve in a sleeving mode. The clamping ring is pressed on a hard sealing piece. The hard sealing rings and the soft sealing rings are separated through the partition rings. The gap between the outer edges of the soft sealing rings and the inner edge of the maze outer sleeve is 0 or a first distance. The gap between the outer edges of the hard sealing rings and the inner edge of the maze outer sleeve is a second distance. The gap between the outer edges of the partition rings and the inner edge of the maze outer sleeve is a third distance. The first distance is smaller than the second distance which is smaller than the third distance. The shaft sealing device is resistant to aging and abrasion and good in sealing effect.

The invention discloses an air-conditioning system and an air-conditioning reversing valve. The air-conditioning reversing valve comprises a valve body and a valve spool, the valve spool comprises a piston part, the piston part comprises a piston cup and an elastic plate, the piston cup comprises a base plate and a frustum-shaped cup body, and the elastic plate comprises an elastic base plate and a frustum-shaped ring formed by a plurality of elastic pieces. The ratio of the thickness of each elastic piece to the thickness of the wall of the cup body is not smaller than 0.15 and not larger than 0.30. When in free state, the ratio of the maximum diameter of the frustum-shaped ring to the diameter of the inner cavity of the valve body is not smaller than 0.99 and not larger than 1.07, and the ratio of the maximum diameter of the cup body to the diameter of the inner cavity of the valve body is not smaller than 1.02 and not larger than 1.09. When at low temperature, the piston cup can be kept to contact with the valve body by the air-conditioning reversing valve, and affection on the sealing performance between the valve spool and the valve body from the low temperature can be reduced. When at high temperature, acting force of the piston cup to the valve body can be kept within a proper range by the air-conditioning valve, and pressure difference of reversing of the air-conditioning reversing valve at high temperature can be reduced.

The invention relates to a hydraulic self-driven double-gate disc gas gate valve which solves the problems of large sealing force in sealing of the gas gate valve and large size of a driving device. The hydraulic self-driven double-gate disc gas gate valve is characterized in that a worm gear and a rocker arm are adopted to drive, wherein the rocker arm only needs to be rotated in a range of less than 60 DEG to complete the open and the close of a valve; the gate valve consists of an open-close mechanism, a locking mechanism, a valve body 2, a drive support 22 and a valve cover 13; wherein key connection is adopted between a valve rod 12 and a driving device 11 as well as between the valve rod 12 and the rocker arm 14; the rocker arm 14 and a gate disc 3 are connected through a connecting shaft 10; and the vertical movement of the gate disc 3 in the valve body 2 is realized through a roller shaft 17 and a roller 18. The gate valve has the advantages of small volume, light weight, convenience in installation and rapidness in open-close speed of the valve and is suitable for serving as an open-close device on pipelines containing tar and pure gas.

The invention belongs to the field of dust removal and particularly relates to an improved pulse back flushing valve for conducting back flushing on a filter element of a filter. The improved pulse back flushing valve comprises a corrugated pipe valve rod assembly. The corrugated pipe valve rod assembly comprises a valve rod and a corrugated pipe, wherein the valve rod is sleeved with the corrugated pipe in a spaced manner. The corrugated pipe comprises multiple corrugated pipe sections which are sequentially connected in the axial direction of the valve rod. Every two adjacent corrugated pipe sections are connected through a correction ring with which the valve rod is sleeved. A damping disc spring or a rubber pad is arranged on the mortise joint face of the valve rod and a valve flap. By the adoption of the structure, the overall rigidity of the corrugated pipe can be effectively improved, and the problem that the corrugated pipe losses stability in the reciprocating motion process of the valve rod and rubs with the valve rod is solved. By the adoption of the improved pulse back flushing valve, the structure of an inner runner of the valve can be remarkably simplified, the flow resistance loss is reduced, the effect of the back flushing process is improved, machining and assembling accuracy is improved, and production cost is reduced. Vibration impact of the pulse back flushing valve under the high-frequency high-speed switching working condition can be remarkably reduced through a corresponding damping component.

The invention relates to an engine control valve (100), comprising a flap (112) rotatably mounted in a valve body (126) about an axis (114) separating said flap into a first portion (112A) and a second portion (112B), said flap (112) being capable of engaging with sealing means supported by the valve body (126) in a closed position in order to halt the flow of a fluid through said flap, for which the first portion (112A) of the flap (112) sealingly engages with first sealing means (122A) and the second portion (112B) of the flap (112) sealingly engages with second sealing means (124B). According to the invention, the first sealing means (122A) and the second sealing means (124B) are mounted securely so as to slide along the valve body (126).

The invention discloses a sewage sampling device for agricultural production, which belongs to the field of sewage sampling devices. It is a sewage sampling device for agricultural production. The refrigeration device continuously releases low-temperature gas, and the low-temperature gas passes through the hollow groove after opening the cover body Rapidly diffuse in all directions, and then slowly diffuse in the thermal insulation fiber until the cold air in the thermal insulation fiber is completely diffused, and the thermal insulation fiber, that is, the sealing curtain in the storage hole and other structures are set up like the fur on the biological surface, isolating the thermal insulation area of ​​the main body of the storage box The heat exchange with the outside world can effectively realize the heat preservation effect of the heat preservation area in the main body of the storage box, reduce the power consumption of the refrigeration device, and make it convenient for technicians to sample and store agricultural sewage. At the same time, the agricultural sewage samples can be stored for a long time , it is not easy to cause some active substances in the sample to reproduce by itself due to its long storage time, and it is not easy to affect the normal detection of sewage.

A double-drive single-gate-disc gas gate valve is used for solving the problem that an existing gas gate valve is high in overall height, limited in switching speed and inconvenient for being switched off quickly, and is characterized by consisting of a valve body 2, a bonnet 3, a transmission support 4, a rotary shaft 5, a worm gear transmission device 6, a gate disc 9 and a valve stem 17. The rotary shaft 5 is in key connection with the worm gear transmission device 6 and a rocker arm 7, the rocker arm 7 is connected with the gate disc 9 through a connecting shaft 8, and the gate disc 9 moves perpendicularly in the valve body 2 through a roller shaft 10 and a roller. The worm gear transmission device 6 drives the rotary shaft 5 to be in fixed-axis rotation, so that the rocker arm 7 drives the gate disc 9 to move perpendicularly through the connecting shaft 8. The gate disc is in transmission with a worm gear, a worm and the rocker arm to be switched on and off, and the gate valve can be switched on and off after the rocker arm is rotated by less than 60 degrees. The double-drive single-gate-disc gas gate valve has the advantages of fastness in switching, safety in use, small size and light weight, and is applicable to being a switching device used on a pipeline delivering tar gas and pure gas.