A kind of used for measuring the differential pressure between fluid differential pressure diaphragm seal to send

Technology field of the utility model relates to a kind of industrial automation instrument, especially involves a used to measure fluid differential pressure diaphragm seal between the differential pressure transmitter. Technical background diaphragm seal differential pressure transmitter is a industrial field measurement of fluid between the differential of automation instrument, it is mainly composed of the differential pressure transmitting head, * flange, flange and the second pressure * pressure flange set pressure diaphragm (with '*' Pressure diaphragm elastic metal diaphragm for tensioning) , * pressure diaphragm pressure flange with * closed * cavity is formed between, * cavity and differential pressure transmitting through * channels at one end of the connecting head, cavity and * and * channel and is filled with filling liquid ( Such as silicone oil, etc. ) : the setting of pressure flange has a second pressure sensitive film, the second pressure sensitive film and the second pressure flange sealing formed between the second chamber, the second chamber through the second channel and differential pressure transmitting at the other end of the connecting head, and the second chamber and the second channel is filled with liquid filled in using, is a measurement of body contact with * pressure sensitive film, is the current body cavity pressure by * and * within the channel fill the liquid passed into the differential analog head; Is another kind of flow body contact with the second pressure sensitive film, is the current body of pressure through the second chamber and the second channel filling liquid is passed to the differential pressure transmitting head; Differential pressure change to send the first two were detected after the pressure of flow, will both be flow body pressure is converted into electrical signals, and the differential pressure is calculated two current body. When is a flow body apart the differential same time, the distance of the head is bigger, in order to reduce the measurement error, is the current body usually will by capillary pressure to pass, that is to say, the cavity capillary and * or the second cavity is connected, and is within the capillary filling filling liquid, the measured medium pressure acting on the elastic metal diaphragm, elastic metal diaphragm cavity pressure transmission to * or the second cavity filled with fluid in the body, and then through the packed capillary liquid to the differential pressure transmitting head, but this kind of structure of diaphragm seal differential pressure transmitter the following deficiencies: due to fill liquid will change with temperature expansion or contraction and separated by differential pressure transmitter is a measurement of body distance is bigger, is strongly influenced by environmental temperature, which makes the two channel fill fluid occur to varying degrees of expansion and contraction, the * pressure diaphragm and a second sensing diaphragm produced by reverse pressure are also different, so greatly affect the accuracy of measurement utility model contents of the utility model aims to provide a balanced diaphragm seal differential pressure transmitter, the two channel filling liquid balancing the degree of expansion and contraction, so as to reduce the measurement error, improve the accuracy of measurement. In order to solve the technical problems, the utility model adopts the following technical scheme a balanced diaphragm seal differential pressure transmitter, including differential pressure transmitting head, * pressure flange, flange and the second pressure described * setting of pressure flange has a * pressure sensitive film, described * pressure diaphragm pressure flange with * closed * cavity is formed between, has described the differential transform with head * connection end, described and * * cavity body connection end through * connection channel through: described the pressure setting of flange has a second pressure sensitive film, described the second pressure sensitive film and the second pressure flange closed the second cavity is formed between, described the differential analog head with the second connecting end, as described in the second chamber and the second connection end through the second connection channel connected; Whose character is: set up also have connection channel compensation, compensation described connecting channels connected to the * set on the same side, compensation connection channel connected with the second connection channel, at the end of the compensation on the other side of the connection channel closed. Further, described the second connection channel and compensation and the total length of connection channel * connection channel of equal length. Further, described the differential transform with the head with the third connection end, described the third connection end connected to the * end in differential pressure change to send the same side of the head, described in the compensation at the end of the connection channel with the third connection end connection, and connected with the second connection channel. Compared with the existing technology, the utility model beneficial effect is that the utility model increases the compensation connection channel, in * connection channel and a second connection channel is affected by environmental temperature and expansion or contraction occurs, because the * connection channel and a second connection channel length is different, so the * connection channel and a second connection within the channel fill fluid occur to varying degrees of expansion and contraction, thus to * pressure diaphragm and a second sensing diaphragm produce different back pressure, also gives rise to measurement error, compensated connection channel offset the first connection channel and a second connection channel length difference, thus make the * connection channel and a second connection within the channel fill fluid is affected by temperature is consistent with the degree of expansion and contraction, thus greatly reduce the measurement error, improves the accuracy of measurement, the practice proves that the measurement error can reduce more than four times. Figure 1 illustrated instructions for one example of this practical new type of structure diagram.
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