A packaging structure of an antifreeze type ceramic pressure sensor

Abstract

The present invention relates to a packaging structure of an antifreeze type ceramic pressure sensor, comprising a sensor housing, in which a buffer tube, a rubber ring A, a ceramic pressure sensor core, a rubber ring B, a signal processing circuit board, and a top cover are sequentially installed from bottom to top, and a hollow separation ring protruding outward is provided in the middle of the buffer tube, and the separation ring is located between the bottom end of the ceramic pressure sensor core and the inner wall of the housing. The beneficial effect of the present invention is that when the measured liquid medium freezes, the volume of the liquid medium in the buffer tube expands, and after the volume of the liquid medium located in the separation ring expands, the thickness of the separation ring increases, thereby pushing the ceramic pressure sensor core to move toward the top cover, so that the frozen liquid medium located at the top of the buffer tube is separated from the sensing surface of the ceramic pressure sensor core, and the diaphragm of the ceramic pressure sensor core is prevented from being squeezed and plastically deformed.

Description

Technical Field

[0001] The invention relates to the field of pressure sensors, and in particular to a packaging structure of an antifreeze type ceramic pressure sensor. Background Art

[0002] A pressure sensor is a measuring element that converts pressure into an electrical signal. When a pressure sensor measures the pressure of a liquid medium, if the liquid medium freezes, it will cause the entire or partial volume of the pressure sensor to expand, causing the diaphragm of the pressure sensor to undergo plastic deformation. Even if the liquid medium thaws, the pressure sensor cannot be used. Therefore, in order to solve this problem in the future, it is necessary to design a packaging structure for an antifreeze ceramic pressure sensor. Summary of the invention

[0003] The object of the present invention is to overcome the above problems existing in the prior art and to provide a packaging structure of an antifreeze type ceramic pressure sensor, which can avoid plastic deformation of the diaphragm of the pressure sensor when the measured liquid medium freezes.

[0004] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0005] A packaging structure of an antifreeze type ceramic pressure sensor comprises a sensor housing, in which a buffer tube, a rubber ring A, a ceramic pressure sensor core, a rubber ring B, a signal processing circuit board, and a top cover are installed in sequence from bottom to top, the signal processing circuit board is connected to the ceramic pressure sensor core through a wire, a hollow separation ring protruding outward is provided in the middle of the buffer tube, and the separation ring is located between the bottom end of the ceramic pressure sensor core and the inner wall of the housing.

[0006] The buffer tube includes a buffer tube section A sleeved in the groove of the ceramic pressure sensor core, a buffer tube section B sleeved in the air inlet of the sensor housing, and a separator ring, wherein the separator ring connects the buffer tube section A and the buffer tube section B to form a buffer tube.

[0007] Wherein, the inner diameters of the buffer tube section A and the buffer tube section B are the same.

[0008] Wherein, a plurality of bubbles are arranged in the buffer tube section A and the buffer tube section B.

[0009] Wherein, the longitudinal section of the separation ring is a U-shaped structure.

[0010] Wherein, the thickness of the outer side wall of the separation ring is smaller than the thickness of the upper side wall and the lower side wall thereof.

[0011] There is a gap between the outer wall of the separation ring and the inner side of the rubber ring A.

[0012] Wherein, the buffer tube is made of rubber.

[0013] The beneficial effect of the present invention is that when the measured liquid medium freezes, the volume of the liquid medium in the buffer tube expands, and after the volume of the liquid medium in the separation ring expands, the thickness of the separation ring will increase, thereby pushing the ceramic pressure sensor core to move toward the top cover, so that the frozen liquid medium at the top of the buffer tube is separated from the sensing surface of the ceramic pressure sensor core, avoiding the diaphragm of the ceramic pressure sensor core from being squeezed and plastically deformed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0015] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0016] Figure 2 Schematic diagram of the structure of the buffer tube in the embodiment of the present invention. DETAILED DESCRIPTION

[0017] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0018] like Figure 1 and 2 As shown, a packaging structure of an antifreeze type ceramic pressure sensor includes a sensor housing 1, in which a buffer tube 2, a rubber ring A3, a ceramic pressure sensor core 4, a rubber ring B5, a signal processing circuit board 6, and a top cover 7 are installed from bottom to top. The signal processing circuit board 6 is connected to the ceramic pressure sensor core 4 through a wire 8. A hollow separating ring 220 protruding outward is provided in the middle of the buffer tube 2, and the separating ring 220 is located between the bottom end of the ceramic pressure sensor core 4 and the inner wall of the housing 1.

[0019] The bottom center of the shell 1 is the air inlet 110, and the upper part of the shell 1 is a mounting groove 120 with a circular cross-section connected to the air inlet 110. The rubber ring A3, the ceramic pressure sensor core 4, the rubber ring B5, the signal processing circuit board 6, and the top cover 7 are all installed in the mounting groove 120.

[0020] The buffer tube 2 includes a buffer tube section A 210 sleeved in the groove of the ceramic pressure sensor core 1, a buffer tube section B 230 sleeved in the air inlet 110 of the sensor housing 1, and a separator ring 220. The separator ring 220 connects the buffer tube section A 210 and the buffer tube section B 230 to form the buffer tube 2. The buffer tube section A 210 and the buffer tube section B 230 have the same inner diameter. A plurality of bubbles are provided in each of the buffer tube section A 210 and the buffer tube section B 230. The buffer tube 2 is made of rubber.

[0021] The longitudinal section of the separation ring 220 is a U-shaped structure. The thickness of the outer side wall 222 of the separation ring 220 is less than the thickness of the upper side wall 221 and the lower side wall 223. There is a gap between the outer side wall 222 of the separation ring 220 and the inner side of the rubber ring A3.

[0022] When the measured liquid medium freezes, the volume of the liquid medium in the buffer tube 2 expands. Since bubbles are provided in the buffer tube section A 210 and the buffer tube section B 230, the expansion of the liquid medium volume will squeeze the bubbles to reduce the volume of the bubbles, thereby offsetting the expansion of the liquid medium due to freezing. After the volume of the liquid medium in the separation ring 220 expands, the thickness of the separation ring 220 will increase, thereby pushing the ceramic pressure sensor core 4 to move toward the top cover, thereby separating the frozen liquid medium at the top of the buffer tube 2 from the sensing surface of the ceramic pressure sensor core 4, thereby preventing the diaphragm of the ceramic pressure sensor core 4 from being squeezed and plastically deformed.

[0023] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A packaging structure of an antifreeze type ceramic pressure sensor, characterized in that: The invention comprises a sensor housing, in which a buffer tube, a rubber ring A, a ceramic pressure sensor core, a rubber ring B, a signal processing circuit board and a top cover are installed in sequence from bottom to top, the signal processing circuit board is connected to the ceramic pressure sensor core through a wire, a hollow separator ring protruding outward is provided in the middle of the buffer tube, and the separator ring is located between the bottom end of the ceramic pressure sensor core and the inner wall of the housing; the buffer tube comprises a buffer tube section A sleeved in a groove of the ceramic pressure sensor core, a buffer tube section B sleeved in an air inlet of the sensor housing, and a separator ring, the separator ring connects the buffer tube section A and the buffer tube section B to form a buffer tube; the inner diameters of the buffer tube section A and the buffer tube section B are the same; a plurality of bubbles are provided in the buffer tube section A and the buffer tube section B; the longitudinal section of the separator ring is a U-shaped structure; the thickness of the outer wall of the separator ring is less than the thickness of its upper side wall and lower side wall; there is a gap between the outer wall of the separator ring and the inner side of the rubber ring A; the buffer tube is made of rubber.

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