摘要:
A seal for a sensor element for a gas sensor for determining the oxygen content in a gas to be measured including exhaust gases of internal combustion engines, the seal including a metallic housing having defined therein a longitudinal bore; a sensor element inserted into the longitudinal bore; and a sealing arrangement provided in the longitudinal bore, surrounding at least a portion of the sensor element, and comprised of at least one seal element comprised of steatite and an additional seal element comprised of boron nitride arranged in contact with one another and in a stack having a side near the gas to be measured so that, when there is one seal element comprised of steatite, the one seal element comprised of steatite is positioned on the side of the stack near the gas to be measured, and so that, when there are two seal elements comprised of steatite, the additional seal element is positioned between the two seal elements comprised of steatite, wherein the at least one seal element comprised of steatite and the additional seal element comprised of boron nitride are inserted into the longitudinal bore of the housing as deformable rings and are pressed-in therein, and wherein, during the pressing-in, the deformable rings are deformed in such a way that the at least one seal element comprised of steatite and the additional seal element comprised of boron nitride are pushed against the sensor element and the housing.
摘要:
A seal for a sensor element of a gas sensor for determining the oxygen content in gases including exhaust gases of an internal combustion engine, which seal seals the sensor element in a longitudinal bore of a housing, the seal including a sealing stack which is positioned within the longitudinal bore of the housing and around the sensor element in use and which is comprised of two sealing bodies and an additional seal positioned between the two sealing bodies. The two sealing bodies are comprised of a pre-sintered ceramic material. The additional seal is comprised of a pre-pressed powder material and has a porosity which is lower than that of the two sealing bodies. The two sealing bodies and the additional seal are compressed together within the longitudinal bore in use, whereby at least the additional seal is deformed so that the sensor element is sealed in a gap-free manner within the longitudinal bore. The pre-pressed powder material of the additional seal may consist essentially of a ductile metal, which may be one of nickel or copper, or graphite which may be fiber-reinforced.
摘要:
An arrangement for sealing a cable bushing for at least one connecting cable, and in particular for a connecting cable of a sensor element of a gas sensor. On the terminal side, the sensor element is arranged in a metallic housing which has a tubular opening, in which a sealing arrangement is disposed, through which the connecting cable is conducted. The sealing arrangement is fixedly surrounded by the housing and has an elastically deformable sealing element and a spring element acting in the direction of the leading-through of the connecting cable, the sealing element being elastically deformed by the spring energy of the spring element.
摘要:
An electro-chemical measuring sensor (10) for determining the oxygen content of gases, in particular for determining the oxygen content in exhaust gases of internal combustion engines, with a potential-free disposed sensor element (14). The sensor element (14) has an oxygen-ion-conducting solid electrolyte body (23), preferably in the shape of a pipe or tube closed at one end, which has an exterior electrode (25) disposed on the exterior surface with a strip conductor (27) on the side toward the contact and also extending on the exterior surface, and which is inserted by means of a sealing ring (20) in a metal housing (11). The sensor element (14) has an electrically insulating layer (21) at least in the area of the sealing ring (20), which covers at least the strip conductor (27) in the direction toward the housing (11). The insulating layer (21) is formed from a mixture of a crystalline, non-metallic material and a glass-forming material. In the course of production the insulating layer (21) is subjected to a thermal treatment above the melting temperature of the glass-forming material, in the course of which the insulating layer (21) forms a glaze filled with the crystalline, non-metallic material.
摘要:
An electrochemical measuring probe for determining the oxygen content of gases, in particular of exhaust gases of internal combustion engines, whose measuring probe body consists essentially of a solid electrolyte, for example stabilised ZrO.sub.2 and whose electrode exposed to the gas to be measured is a cermet electrode which is coated with a finely porous ion-conducting covering layer composed of an ion-conducting supporting matrix material having no sintering activity of the type standard for cermet electrodes the covering layer is covered by a porous protective layer. The ion-conducting porous covering layer appreciably increases the activity of the cermet electrode.
摘要:
An exhaust gas sensor which is exposed to exhaust gas, includes a measuring electrode; and a porous ceramic coating provided on the measuring electrode and comprised of at least two layers, a first porous ceramic layer which is provided on the measuring electrode and at least a second porous ceramic layer which is provided on the first porous ceramic layer and which is directly exposed to the exhaust gas, wherein the first porous ceramic layer contains getter substances for removal of substances that are harmful to the measuring electrode, and wherein the second porous ceramic layer is provided with one of a diffusion resistance or a catalytic effect relative to exhaust gas constituents such that, at the boundary of the first and second porous ceramic layers, a gas composition is present in use which is comprised of one of oxidizable or reducible gas constituents and which sets a control position for the exhaust gas sensor.
摘要:
An ignition laser, includes a laser-active solid-state body, a housing and a combustion chamber window, the housing having an inner sleeve and an outer sleeve. An insert is provided between the inner sleeve and the outer sleeve, the insert and the combustion chamber window being joined sealingly and integrally.
摘要:
A gas sensor includes a sensor element for determining at least one physical quantity of a gas, e.g., for determining the concentration of a gas component in an exhaust gas of an internal combustion engine or the temperature of the exhaust gas. The sensor element is fixed in position by the sealing system in a housing of the gas sensor. The sealing system includes at least one sealing element, which includes a mixture of a ceramic material and a glass. The hemisphere temperature of the glass is above 750° Celsius.
摘要:
A heating element, preferably for oblong plate-shaped sensors for measuring oxygen concentration in internal combustion engine exhaust gas, has a conductive heating strip at one end of the heating element and electrical conductors which are connected electrically to the conductive heating strip and which supply the heating current and provide connection to the other end of the heating element. The positive temperature coefficient of the resistor material of the conductive heating strip is lower than the positive temperature coefficient of the material of at least one section of the conductors.
摘要:
A protective tube of metal resistant to corrosion from hot gas surrounds and is spaced from a closed-end ceramic sensor body within which is an electrical heater. The protective tube extends beyond the end of the sensor body and has an annular groove at its open end, which bulges into the space enclosed by the tube and the outer end of which provides a flange perpendicular to the axis of the tube a fine metal screen may be provided across the open end of the tube for incepting droplets of water that may sometimes be present in the gas to be measured. The open end of the protective tube may be only slightly constricted by the groove or, in another embodiment, it may taper down in a rounded fashion to a narrower opening.