69results about How to "Small pressure resistance" patented technology

An air flow measuring device includes a flow amount sensor for measuring a flow amount of air in a duct, and a tube body for defining a bypass passage in the duct. An upstream end surface of the tube body has an inlet of the bypass passage, and a downstream end surface thereof has an outlet of the bypass passage. An outer diameter of an outer peripheral surface of the tube body has a smallest dimension at the upstream end surface, and a largest dimension at the downstream end surface. Furthermore, the outer peripheral surface of the tube body has an upstream portion extending downstream from the upstream end surface in a predetermined range, and the upstream portion of the outer peripheral surface is a convex curve surface in which the outer diameter is increased by a ratio from the upstream end surface toward downstream.

Disclosed is short-circuit protection method for circuits equipped with a plurality of power switching elements, wherein, in cases in which a short circuit has been detected in one power switching element by means of a detection means for detecting short circuits in the aforementioned power switching elements, a shutdown process is executed that shuts down the gates of the other power switching elements through which the short circuit current from the short circuit in the aforementioned one power switching element is passed; and moreover, while the shutdown process is being executed, the value of the gate resistance of the aforementioned other power switching elements is changed.

The invention relates to a diagonal-flow constant-temperature flameless burner comprising an inner barrel, an outer barrel, a center tube and an annular baffle plate, wherein the inner barrel is horizontally arranged; one end of the inner barrel is communicated with an inlet pipe of the inner barrel; the other end of the inner barrel extends into a combustion furnace; the part of the inner barrel, inside the combustion furnace, is of an inner and outer dual-layer structure; a groove formed by the inner layer and the outer layer is filled with a refractory matter; the center tube is composed of an inlet section, a transition section and an outlet section; the diameter of the inlet section is greater than that of the outlet section; the transition section is of a tapered structure; the center tube horizontally penetrates through the center of the inner barrel; a certain axial distance is kept between the end face of the outlet section and the end face of an air outlet of the inner barrel; the outer sleeve is arranged outside the inner barrel; one end of the outer sleeve is open and tightly connected with one side of the annular baffle plate; one side surface of the outer barrel is communicated with an inlet pipe of the outer barrel; a plurality of diagonal-flow nozzles are uniformly arranged at the other side of the annular baffle plate at the periphery of the inner barrel along the circumference; one end of each diagonal-flow nozzle is fixed on a round baffle plate and communicated with the outer barrel; the outflow direction of the other end deviates from the outflow direction of the center tube. The diagonal-flow constant-temperature flameless burner works in a constant temperature state without cold and heat exchange.

The invention relates to the technical field of solidified foam, in particular to a double-sided grooved surface solidified layer foam structure, comprising: a first solidified layer, a first foam structure, grooves; a first solidified layer and a second solidified layer It is arranged at both ends of the foam body, and the first solidified layer and the second solidified layer are connected to the foam body by bonding; the first foam structure and the second foam structure are arranged on both sides of the foam body , and the first foam structure and the second foam structure are connected to the foam body by gluing; the two sides of the foam body are provided with grooves, and the foam body and the groove are connected by embedding; The improvement on the structure, combined with the existing technology, has the advantages of high sealing performance, avoiding the release of gas outside, and small compression deformation resistance, which solves the problems and deficiencies in the existing device technology and makes it more practical the goal of.

The invention belongs to the field of dedusting equipment and in particular relates to a gas deduster formed by a high-efficiency dust-collecting body and static electricity through combination. The gas deduster is composed of a shell, a discharge electrode plate, a dust collecting box, a soot blower and a dust hopper, wherein the shell is of a rectangular chamber and is divided into an upper independent gas purification chamber and a lower independent dedusting chamber by a partition plate; more than two vent holes are uniformly formed in the partition plate; a gas inlet is formed in the box wall at the front end of the dedusting chamber, and the bottom of the dedusting chamber opens and is provided with a support beam; a gas outlet is formed in the box wall at the rear end of the gas purification chamber; the discharge electrode plate and the dust collecting box are fixedly arranged in the dedusting chamber and are uniformly arranged at intervals; the soot blower is fixedly arranged on the top plate of the dedusting chamber; the dust hopper is fixedly arranged at the bottom of the dedusting chamber. The gas deduster has the beneficial effects of being simple in structure, improving the dedusting efficiency, preventing secondary gas pollution and reducing the maintaining cost.