High-temperature resistant pressure transmitter

Abstract

The present invention discloses a high-temperature resistant pressure transmitter, which includes a housing and a plug fixedly connected. The plug has a plug housing made of plastic material. A pressure-sensitive element is provided inside the housing and the plug, and the pressure-sensitive element is tightly fixed by a positioning member. It is characterized in that: a load-bearing body made of high-temperature resistant material is provided between the bottom surface of the pressure-sensitive element and the upper end surface of the plug housing, and the bottom surface of the pressure-sensitive element is in contact with the load-bearing body, so as to reduce or eliminate the pressure exerted on the upper end surface of the plug housing by the pressure-sensitive element due to working force. The present invention can still maintain the measurement accuracy under high medium temperature conditions and improve the applicable range of the measurement temperature.

Description

Technical Field

[0001] The present invention relates to an improved invention of a pressure transmitter. Background Art

[0002] The pressure transmitters in the prior art, including capacitive pressure transmitters, generally have the following structure: including a fixedly connected outer shell and a plug. The plug has a plug housing made of plastic material. A pressure-sensitive element is provided inside the outer shell and the plug. The pressure-sensitive element is pressed and fixed by a positioning member on the upper end surface of the plug housing. The pressure-sensitive element abuts against the upper end surface of the plug housing through the four corners of the bottom surface. The biggest drawback of the above-structured pressure transmitter is that the contact area between the pressure-sensitive element and the upper end surface of the plug housing is small, and the working pressure is high. When the temperature of the medium measured by the pressure transmitter is relatively high, the upper end surface of the plug housing in contact with the bottom surface of the pressure-sensitive element will also bear a relatively high temperature. And for the need of facilitating the thermoforming process, the plug housing generally uses thermoplastic plastic. In this way, the contact part between the upper end surface of the plug housing and the bottom surface of the pressure-sensitive element is prone to high-temperature deformation during the measurement process, which will further lead to a large error in the measurement accuracy. The pressure transmitters in the prior art generally do not exceed 100 degrees for the measured temperature of the medium. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a high-temperature resistant pressure transmitter that can still maintain the measurement accuracy and improve the applicable range of the measurement temperature under high medium temperature conditions.

[0004] The present invention is implemented through the following technical solutions:

[0005] The high-temperature resistant pressure transmitter includes a fixedly connected outer shell and a plug. The plug has a plug housing made of plastic material. A pressure-sensitive element is provided inside the outer shell and the plug. The pressure-sensitive element is pressed and fixed by a positioning member. The characteristic is that a load-bearing body made of high-temperature resistant material is provided between the bottom surface of the pressure-sensitive element and the upper end surface of the plug housing. The bottom surface of the pressure-sensitive element abuts against the load-bearing body to reduce or eliminate the pressure exerted by the pressure-sensitive element on the upper end surface of the plug housing due to working stress.

[0006] For the pressure transmitter of the above technical solution, a load-bearing body made of high-temperature resistant material is provided between the pressure-sensitive element and the upper end face of the plug housing. The pressure-sensitive element only contacts the load-bearing body and does not contact the upper end face of the plug housing. In this way, when the pressure transmitter measures a high-temperature medium, although the contact area between the pressure-sensitive element and the load-bearing body is small, the working pressure on the load-bearing body is large, and the upper end face of the plug housing also bears a relatively high temperature. However, because the load-bearing body itself does not deform under high temperature, by increasing the contact area between the load-bearing body and the upper end face of the plug housing or transferring the acting force of the load-bearing body on the upper end face of the plug housing, the working pressure of the pressure-sensitive element acting on the upper end face of the plug housing due to working stress can be reduced or eliminated, making it difficult for the upper end face of the plug housing to generate high-temperature deformation, thereby ensuring the measurement accuracy at high medium temperatures and enabling the pressure transmitter to have a large measurement temperature range.

[0007] As a preferred technical solution one, the contact area between the load-bearing body and the upper end face of the plug housing is larger than the contact area between the pressure-sensitive element and the upper end face of the plug housing when no load-bearing body is provided. The load-bearing body is a metal washer, and the contact area between the metal washer and the upper end face of the plug housing is larger than the contact area between the pressure-sensitive element and the upper end face of the plug housing when no metal washer is provided.

[0008] The above technical solution reduces the working pressure of the pressure-sensitive element acting on the upper end face of the plug housing due to working stress by increasing the contact area between the load-bearing body and the upper end face of the plug housing, making it difficult for the upper end face of the plug housing to generate high-temperature deformation, thereby ensuring the measurement accuracy at high medium temperatures and is applicable to the measurement of media with a temperature of 130 degrees or below.

[0009] As a preferred technical solution two, the bottom of the load-bearing body is provided with support feet and abuts against the riveted flange of the housing through the support feet. The load-bearing body is an aluminum alloy seat, which is fixedly connected to the upper end of the plug housing. A cavity is provided in the aluminum alloy seat for installing the pressure-sensitive element, and convex platforms for supporting the four corners of the pressure-sensitive element are provided on the inner wall of the cavity.

[0010] The above technical solution eliminates the contact pressure of the pressure-sensitive element acting on the upper end face of the plug housing due to working stress by transferring the acting force on the upper end face of the plug housing by the load-bearing body, making the upper end face of the plug housing not generate high-temperature deformation, thereby ensuring the measurement accuracy at high medium temperatures and is applicable to the measurement of media with a temperature of 160 degrees high. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention has the following drawings:

[0012] Figure 1 is the external structure diagram of the first embodiment of the present invention

[0013] Figure 2 isFigure 1 Exploded view of the structure without the outer shell,

[0014] Figure 3 is Figure 1 the exploded view of the split structure of

[0015] Figure 4 This is the external view of the second embodiment of the present invention,

[0016] Figure 5 is Figure 4 the exploded view of the structure without the outer shell,

[0017] Figure 6 is Figure 4 the exploded view of the split structure of Detailed implementation mode

[0018] As shown in Figure 1 、 2 and 3, the high-temperature resistant pressure transmitter of the present invention includes an outer shell 1 and a plug. The outer shell 1 is made of metal. The outer shell 1 is fixedly connected to the plug through a riveted and flanged edge 8. The plug has a plug housing 5 made of thermoplastic plastic. A pressure-sensitive element 3 is provided inside the outer shell 1 and the plug. The pressure-sensitive element 3 is tightly fixed by a plastic positioning member 2. The plastic positioning member 2 is snap-connected to the plug housing 5 through a hook body 6 engaging a hook groove 7. The bottom surface of the pressure-sensitive element 3 faces the upper end surface of the plug housing 5. A metal washer 4 is provided between the bottom surface of the pressure-sensitive element 3 and the upper end surface of the plug housing 5. The pressure-sensitive element 3 abuts against the upper end surface of the metal washer 4 through the four corners of the bottom surface. The lower end surface of the metal washer 4 abuts against the upper end surface of the plug housing 5. The contact area between the metal washer 4 and the upper end surface of the plug housing 5 is larger than the contact area between the pressure-sensitive element 3 and the upper end surface of the plug housing 5 when the metal washer 4 is not provided. The above design can reduce the working pressure exerted by the pressure-sensitive element 3 on the upper end surface of the plug housing 5 due to working stress.

[0019] As shown in Figure 4 、 5As shown in FIGS. 5 and 6, the high-temperature resistant pressure transmitter of the present invention includes a housing 11 and a plug. The housing 11 is made of metal. The housing 11 is fixedly connected to the plug through a riveted flange 17. The plug has a plug housing 16 made of thermoplastic. A pressure-sensitive element 13 is provided inside the housing 11 and the plug. The pressure-sensitive element 13 is tightly fixed by a plastic positioning member 12. The plastic positioning member 12 forms a snap connection with the plug housing 16 through a hook body 18 snapped into a hook groove 15. The bottom surface of the pressure-sensitive element 13 faces the upper end surface of the plug housing 16. An aluminum alloy seat 14 is provided between the pressure-sensitive element 13 and the upper end surface of the plug housing 16. The aluminum alloy seat 14 is fixedly connected to the upper end of the plug housing 16. The aluminum alloy seat 14 is provided with a cavity for installing the pressure-sensitive element 13. The inner wall of the cavity is provided with a convex platform 19 for supporting the four corners of the pressure-sensitive element 13. Four feet 20 are integrally provided at the bottom of the aluminum alloy seat 14 and abut against the riveted flange 17 of the housing 11 through the four feet 20. The above design can eliminate the working pressure exerted by the pressure-sensitive element on the upper end surface of the plug housing due to working stress.

Claims

1. High-temperature pressure transmitter, comprising a housing and a plug, the housing is fixedly connected to the plug by riveting and flanging, the plug has a plug housing made of plastic material, a pressure-sensitive element is provided inside the housing and the plug, and the pressure-sensitive element is pressed and fixed by a positioning member, and is characterized in that: A load-bearing body made of high-temperature resistant material is provided between the bottom surface of the pressure-sensitive element and the upper end surface of the plug housing. The bottom surface of the pressure-sensitive element abuts against the load-bearing body to reduce or eliminate the pressure exerted on the upper end surface of the plug housing due to the working force of the pressure-sensitive element.

2. The high-temperature resistant pressure transmitter according to claim 1, wherein: The contact area between the load-bearing body and the upper end surface of the plug housing is larger than the contact area between the pressure-sensitive element and the upper end surface of the plug housing when the load-bearing body is not provided.

3. The high-temperature resistant pressure transmitter according to claim 2, wherein: The load-bearing body is a metal washer, and the contact area between the metal washer and the upper end surface of the plug housing is larger than the contact area between the pressure-sensitive element and the upper end surface of the plug housing when the metal washer is not provided.

4. The high-temperature resistant pressure transmitter according to claim 1, wherein: The bottom of the load-bearing body is provided with feet, and the feet abut against the riveted flange of the outer shell.

5. The high-temperature resistant pressure transmitter according to claim 4, characterized in that: The load-bearing body is an aluminum alloy seat, which is fixedly connected to the upper end of the plug housing. A cavity is provided in the aluminum alloy seat for installing the pressure-sensitive element, and convex platforms for supporting the four corners of the pressure-sensitive element are provided on the inner wall of the cavity.

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