Sensor with high pressure resistance and packaging method thereof

Abstract

The invention relates to the technical field of sensors, in particular to a sensor with high pressure resistance and a packaging method thereof. The packaging method of the sensor with the high pressure resistance comprises the steps that a shell and a core are provided, the shell is provided with a first installation opening and a second installation opening which are communicated with the interior of the shell, the first installation opening is used for being communicated with an outlet of a pressure container, the second installation opening is used for installing the core, and the inner wall of the shell is provided with an inner conical surface; an outer conical surface is arranged on the outer wall of the core body, and the conicity of the outer conical surface is equal to that of the inner conical surface; and the core body is mounted in the shell, so that the outer conical surface and the inner conical surface are in interference fit. According to the scheme, the problem that the core body is damaged due to the fact that the welding temperature is too high can be avoided, and the process of installing the core body into the shell is more convenient.

Description

Technical Field

[0001] The present application relates to the field of sensor technology, and in particular to a sensor with high pressure resistance and a packaging method thereof. Background Art

[0002] Existing sensors with high pressure resistance usually use welding to connect the core and the shell to achieve airtightness requirements. At the same time, welding connection also improves the bearing capacity of the core. However, during the welding process, when the welding strength is too high, the core will be easily damaged, which will not only affect the airtightness, but also the bearing capacity of the core. Therefore, welding connection will also limit the bearing capacity of the core. Summary of the invention

[0003] The embodiments of the present application at least provide a sensor with high pressure resistance and a packaging method thereof, which can avoid the problem of core damage caused by excessive welding temperature and make the process of installing the core into the shell more convenient.

[0004] In a first aspect, an embodiment of the present application provides a packaging method for a sensor with high pressure resistance, comprising:

[0005] A shell and a core are provided, wherein the shell is provided with a first mounting port and a second mounting port communicating with the interior thereof, wherein the first mounting port is used to communicate with the outlet of the pressure vessel, and the second mounting port is used to install the core, wherein the inner wall of the shell is provided with an inner conical surface, and the outer wall of the core is provided with an outer conical surface, and the tapers of the outer conical surface and the inner conical surface are equal;

[0006] The core is installed in the housing so that the outer conical surface and the inner conical surface achieve interference fit.

[0007] In an optional embodiment, the core is installed in the housing so that the outer conical surface and the inner conical surface achieve an interference fit, comprising:

[0008] Heating the outer shell to expand it until the diameter of the inner cone surface is larger than the diameter of the outer cone surface;

[0009] installing the core in the housing;

[0010] The shell is restored to normal temperature to achieve interference fit between the outer conical surface and the inner conical surface.

[0011] In an optional embodiment, the core is installed in the housing so that the outer conical surface and the inner conical surface achieve an interference fit, comprising:

[0012] Cooling the core to shrink it until the diameter of the outer cone surface is smaller than the diameter of the inner cone surface;

[0013] installing the core in the housing;

[0014] The core body is restored to normal temperature to achieve interference fit between the outer conical surface and the inner conical surface.

[0015] In an optional embodiment, the core is installed in the housing so that the outer conical surface and the inner conical surface achieve an interference fit, comprising:

[0016] The core body is pressed into the shell by using external force, so that the outer conical surface and the inner conical surface achieve interference fit.

[0017] In an optional embodiment, the method further includes:

[0018] The gap between the core and the shell is sealed.

[0019] In an optional implementation, the sealing of the gap between the core and the shell includes:

[0020] The gap between the core and the shell is sealed by welding.

[0021] In a second aspect, an embodiment of the present application further provides a sensor with high pressure resistance, which is prepared using the method described in any one of the first aspects.

[0022] In an optional embodiment, there is an interference friction force between the core and the shell, and the interference friction force is greater than the thrust force applied to the core during detection.

[0023] In an optional embodiment, a seal is formed between the core and the shell.

[0024] In an optional embodiment, the core and the shell are sealed by welding.

[0025] The above technical solution of the present application has the following beneficial technical effects:

[0026] The sensor with high pressure resistance in the embodiment of the present application has a shell and a core body that are fixed by interference fit, so that the shell and the core body are no longer fixed by welding. Therefore, during the assembly process, the problem of core body damage due to excessive welding temperature can be avoided. In addition, the problem of limiting the connection strength between the shell and the core body due to the size of the welding point can also be avoided, which is beneficial to improving the detection range of the sensor.

[0027] In addition, since the interference fit surfaces of the shell and the core body are both conical surfaces, the conical surfaces can play a guiding and positioning role during the process of installing the core body into the shell, thereby making the process of installing the core body into the shell more convenient.

[0028] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. The drawings herein are incorporated into the specification and constitute a part of the specification. These drawings illustrate embodiments consistent with the present application and are used together with the specification to illustrate the technical solutions of the present application. It should be understood that the following drawings only illustrate certain embodiments of the present application and should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can also be obtained based on these drawings without creative work.

[0030] Figure 1 A schematic diagram of the structure of a sensor with high pressure resistance provided in an embodiment of the present application is shown;

[0031] Figure 2 A schematic diagram of assembling a sensor with high pressure resistance provided by an embodiment of the present application is shown;

[0032] Figure 3 A top view of a sensor with high pressure resistance provided by an embodiment of the present application is shown;

[0033] Figure 4 A schematic diagram showing the interference fit state of the shell and the core provided in the embodiment of the present application is shown;

[0034] Figure 5 A schematic diagram of the structure of another sensor with high pressure resistance provided in an embodiment of the present application is shown;

[0035] Figure 6 A schematic diagram showing the structure of another sensor with high pressure resistance provided in an embodiment of the present application is shown;

[0036] Figure 7 A schematic diagram of a model of a shell and a core provided in an embodiment of the present application is shown;

[0037] Figure 8 A linear relationship diagram between the interference friction force and the interference ratio provided in an embodiment of the present application is shown;

[0038] Figure numerals: 10, housing; 11, first mounting opening; 12, second mounting opening; 13, inner cone; 14, limiting surface; 20, core; 21, outer cone; 30, sensitive element; 40, pin; 50, weld. DETAILED DESCRIPTION

[0039] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0040] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0041] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0042] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0043] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] In a first aspect, an embodiment of the present application provides a sensor with high pressure resistance, wherein a housing and a core of the sensor are fixed by interference fit.

[0045] like Figure 1 and Figure 2 As shown, the sensor with high pressure resistance provided by the embodiment of the present application includes: a housing 10 and a core 20. The housing 10 is provided with a first mounting port 11 and a second mounting port 12 connected to the interior thereof, the first mounting port 11 is used to be connected to the outlet of the pressure vessel, and the second mounting port 12 is used to install the core 20, and the first mounting port 11 and the second mounting port 12 are respectively located at opposite ends of the axial direction of the housing 10. Among them, the inner wall of the housing 10 is provided with an inner conical surface 13, and the outer wall of the core 20 is provided with an outer conical surface 21. In the installed state, the inner conical surface 13 and the outer conical surface 21 are interference fit.

[0046] According to the above-mentioned sensor, the shell 10 and the core 20 are fixed by interference fit, so that the shell 10 and the core 20 are no longer fixed by welding. Therefore, during the assembly process, the problem of damage to the core 20 due to excessive welding temperature can be avoided, and the problem of limiting the connection strength between the shell 10 and the core 20 due to the size of the welding point can also be avoided, which is beneficial to improving the detection range of the sensor.

[0047] In addition, since the interference fit surfaces of the shell 10 and the core 20 are both conical surfaces, the conical surfaces can play a guiding and positioning role during the process of installing the core 20 into the shell 10, thereby making the process of installing the core 20 into the shell 10 more convenient.

[0048] It should be noted that the core 20 is usually made of a glass sintered seat, and a sensitive element 30 and a pin 40 connected to the sensitive element 30 are arranged on the core 20. Figure 1 and Figure 2 As shown, the sensitive element 30 is arranged at one end of the core 20 facing the pressure vessel, and the pin 40 is penetrated in the core 20 and connected to the sensitive element 30. When in use, the sensitive element 30 detects the measured parameters of the pressure vessel, such as pressure, temperature, gas concentration, etc., and transmits them to a data processor or computer through the pin 40.

[0049] Optionally, in this embodiment, the inner conical surface 13 and the outer conical surface 21 have the same height.

[0050] Optionally, in this embodiment, the inner conical surface 13 may be a part of the inner wall of the housing 10. For example, the inner wall of the housing 10 includes a plurality of inner step surfaces in sequence from the second mounting opening 12 to the first mounting opening 11, and one of the plurality of inner step surfaces is the inner conical surface 13. In this embodiment, the inner conical surface 13 is preferably located at one end of the housing 10 close to the second mounting opening 12.

[0051] Optionally, in this embodiment, the outer conical surface 21 may be a part of the outer wall of the core 20. For example, the outer wall of the core 20 includes a plurality of outer step surfaces in sequence from the second mounting opening 12 to the first mounting opening 11, and one of the plurality of outer step surfaces is the outer conical surface 21. In this embodiment, it is preferred that the first outer step surface is set as the outer conical surface 21, that is, the outer conical surface 21 is located at one end of the core 20 close to the second mounting opening 12.

[0052] Optionally, in this embodiment, there is an interference friction between the shell 10 and the core 20, and the interference friction is greater than the thrust received by the core 20 during detection. In this way, it is possible to prevent the core 20 from coming out of the shell 10 during the detection process, thereby causing sensor failure.

[0053] It should be understood that, in a specific setting, the interference friction between the shell 10 and the core 20 is related to the interference amount between the two. The larger the interference amount, the greater the interference friction between the shell 10 and the core 20.

[0054] Optionally, in this embodiment, the housing 10 is provided with a limiting surface 14, and the limiting surface 14 is used to limit the installation depth of the core 20. In the specific setting, the limiting surface 14 can limit the core 20, and when the limiting surface 14 limits the core 20, the inner surface and the outer surface are in an interference fit position. In this way, it can be avoided that the interference fit between the inner surface and the outer surface of the core 20 is affected by the installation depth being too large / too small.

[0055] It is possible that the limiting surface 14 is located inside the housing 10, such as Figure 1 Specifically, the limiting surface 14 can be a step surface formed on the inner wall of the housing 10 .

[0056] Alternatively, the limiting surface 14 is located on the end surface of the housing 10, such as Figure 5 and Figure 6 Specifically, the limiting surface 14 can be an end surface of the housing 10 close to the second installation opening 12 .

[0057] Optionally, in this embodiment, a seal may be formed between the housing 10 and the core 20. In this way, it is possible to avoid affecting the air tightness due to the presence of a gap between the interference surfaces, which is beneficial to improving the reliability of the sensor.

[0058] It is possible that the shell 10 and the core 20 are sealed by welding. Specifically, the gap between the core 20 and the shell 10 is welded along the circumferential direction, such as Figure 3 As shown. In this way, not only can the air tightness between the core 20 and the shell 10 be improved, but also two connection modes are provided between the core 20 and the shell 10, namely, welding connection and interference fit. Compared with a single connection mode, such a setting can appropriately reduce the interference between the core 20 and the shell 10 while ensuring that the connection strength remains unchanged, thereby avoiding design failure due to excessive plastic deformation, and appropriately reducing the size of the welding point, thereby reducing the temperature rise caused by energy injection during welding and reducing the risk of damage to the core 20.

[0059] It should be understood that, depending on the structure of the core 20, the weld 50 between the core 20 and the shell 10 may be located on the end surface or the side surface of both. Figure 1 , Figure 5 and Figure 6 shown.

[0060] Optionally, in this embodiment, the housing 10 is a tubular structure.

[0061] Optionally, in this embodiment, the housing 10 is disposed on the pressure vessel and is connected and fixed to the pressure vessel.

[0062] It is possible that the housing 10 is connected to the pressure vessel via an adapter. Specifically, the housing 10 and the pressure vessel are connected in a detachable manner, so that the sensor can be easily disassembled.

[0063] Alternatively, the housing 10 and the pressure vessel are an integrated structure. In this embodiment, the housing 10 and the pressure vessel are preferably an integrated structure, so that the connection strength between the housing 10 and the pressure vessel can be improved.

[0064] In a second aspect, an embodiment of the present application provides a packaging method for a sensor with high pressure resistance.

[0065] The packaging method of a sensor with high pressure resistance provided in an embodiment of the present application includes:

[0066] S100, providing a shell 10 and a core 20, wherein the shell 10 is provided with a first mounting port 11 and a second mounting port 12 communicating with the interior thereof, wherein the first mounting port 11 is used to communicate with the outlet of the pressure vessel, and the second mounting port 12 is used to install the core 20, wherein the inner wall of the shell 10 is provided with an inner conical surface 13, and the outer wall of the core 20 is provided with an outer conical surface 21, and the tapers of the outer conical surface 21 and the inner conical surface 13 are equal, such as Figure 2 shown.

[0067] S200, the core 20 is installed in the housing 10 so that the outer conical surface 21 and the inner conical surface 13 are interference fit, such as Figure 1 shown.

[0068] In the sensor prepared according to the above method, the shell 10 and the core 20 are fixed by interference fit, so that the shell 10 and the core 20 are no longer fixed by welding. Therefore, during the assembly process, the problem of damage to the core 20 due to excessive welding temperature can be avoided. In addition, the problem of limiting the connection strength between the shell 10 and the core 20 due to the size of the welding point can also be avoided, which is beneficial to improving the detection range of the sensor.

[0069] In addition, since the interference fit surfaces of the shell 10 and the core 20 are both conical surfaces, the conical surfaces can play a guiding and positioning role during the process of installing the core 20 into the shell 10, thereby making the process of installing the core 20 into the shell 10 more convenient.

[0070] It should be noted that the core 20 is usually made of a glass sintered seat, and a sensitive element 30 and a pin 40 connected to the sensitive element 30 are arranged on the core 20. Figure 1 and Figure 2 As shown, the sensitive element 30 is arranged at one end of the core 20 facing the pressure vessel, and the pin 40 is penetrated in the core 20 and connected to the sensitive element 30. When in use, the sensitive element 30 detects the measured parameters of the pressure vessel, such as pressure, temperature, gas concentration, etc., and transmits them to a data processor or computer through the pin 40.

[0071] Optionally, in this embodiment, in order to install the core 20 in the shell 10, the shell 10 may be heated to expand before installation. Specifically, the method includes: heating the shell 10 to expand it until the diameter of the inner cone 13 is larger than the diameter of the outer cone 21; installing the core 20 in the shell 10; restoring the shell 10 to room temperature so that the outer cone 21 and the inner cone 13 achieve interference fit.

[0072] Optionally, in this embodiment, in order to install the core 20 in the housing 10, the core 20 may be frozen before installation to shrink it. Specifically, the method includes: cooling the core 20 to shrink it until the diameter of the outer cone 21 is smaller than the diameter of the inner cone 13; installing the core 20 in the housing 10; restoring the core 20 to room temperature to achieve interference fit between the outer cone 21 and the inner cone 13.

[0073] Optionally, in this embodiment, in order to install the core 20 in the housing 10 , the core 20 may be pressed into the housing 10 by external force.

[0074] Optionally, in this embodiment, after the core 20 is installed in the housing 10, the gap between the core 20 and the housing 10 may be sealed. In this way, the air tightness may be prevented from being affected by the gap between the interference surfaces, which is beneficial to improving the reliability of the sensor.

[0075] It is possible to seal the gap between the core 20 and the shell 10, specifically including: sealing the gap between the core 20 and the shell 10 by welding. Specifically, the gap between the core 20 and the shell 10 is welded along the circumferential direction, such as Figure 3 As shown. In this way, not only can the air tightness between the core 20 and the shell 10 be improved, but also two connection modes are provided between the core 20 and the shell 10, namely, welding connection and interference fit. Compared with a single connection mode, such a setting can appropriately reduce the interference between the core 20 and the shell 10 while ensuring that the connection strength remains unchanged, thereby avoiding design failure due to excessive plastic deformation, and appropriately reducing the size of the welding point, thereby reducing the temperature rise caused by energy injection during welding and reducing the risk of damage to the core 20.

[0076] It should be understood that, depending on the structure of the core 20, the weld 50 between the core 20 and the shell 10 may be located on the end surface or the side surface of both. Figure 1 , Figure 5 and Figure 6 shown.

[0077] The feasibility of the sensor of the embodiment of the present application is verified as follows.

[0078] For the sake of demonstration, we assume that the average internal compressive stress caused by the interference fit is σ avg The contact surface radius of the cone is R 1i and R 2i , the height of the internal pressure stress area is h, the friction coefficient between metals is f, and the container pressure is P. The angle of the cone is The side area of ​​the cone is A, and the thrust of the container on the core is F l and the maximum friction F f As follows;

[0079]

[0080] F l =πR 1i 2 P Eq.2

[0081] F f =fAσ avg Eq.3

[0082] Under reasonable design parameters, if there is sufficient internal stress and contact area, the friction force F f Fully capable of carrying the full load F l In fact, because the core and shell surfaces may have different degrees of irregularities, there may be a risk of gas or liquid leakage, so it is still necessary to use welding to seal one end of the interference contact surface to cut off possible leakage paths. This can be Figure 2 Any form of welding. It is also conceivable that in special cases, if the gap generated by the interference surface is small enough, welding sealing becomes unnecessary, such as when the medium in the container has a strong viscosity or is a liquid-solid mixture. These situations do not affect the effectiveness of the present invention. In the case of welding, because the core and the shell will have a certain elastic deformation under the pressure of the container, the deformation will form a certain stress load on the welding part. Obviously, under the condition that all conditions are the same, the interference fit can greatly reduce the thrust that the welding point needs to withstand. This makes the size of the welding point very small, thereby reducing the temperature rise caused by energy injection during welding, and effectively protecting the core of the glass sintering seat.

[0083] It should be noted that the welding operation may have a certain impact on the internal pressure stress generated by the interference fit before welding. It can be imagined that when the temperature of the metal near the welding fusion zone rises to nearly melting, the pre-existing internal pressure stress will far exceed the local yield strength at this temperature, thereby causing plastic deformation. After the temperature returns to normal, the previously existing interference internal stress is affected. Therefore, there will be a certain transition between the welding area and the effective interference fit area. Subsequent analysis assumes that the effective interference contact area does not include the welding molten zone. This is a detail in the design analysis and implementation that will not be repeated here and does not affect the effectiveness of the present invention.

[0084] An effective design requires defining the parameters contained in Eq 1, Eq 2, and Eq 3, and considering the transition region as described above. This process includes both theoretical analysis and experimental verification.

[0085] Using today's finite element analysis (FEA) simulation tools, mechanical design parameters and geometric optimization can be analyzed through simulation modeling, and the amount of interference fit (size) required to achieve friction can be calculated. It should be pointed out that the internal pressure stress caused by the interference fit should not exceed the yield strength of the material within the operating temperature range, and a certain safety factor should be maintained. If the internal stress caused by the interference fit exceeds the yield strength of the material itself, the core and shell will produce plastic deformation. After plastic deformation, the material no longer returns to its initial state, thereby reducing the amount of interference fit and weakening the internal stress caused by the interference. Excessive plastic deformation will lead to design failure.

[0086] Below we use a classic and elegant calculation formula to demonstrate the selection of design parameters. It is emphasized that this is a demonstration with strong ideal assumptions. The purpose is to demonstrate logic. Therefore, the effectiveness of the present invention is not limited by the idealization or parameter selection of the following analysis.

[0087] For convenience, we assume that the core and shell are long enough cylinders to ignore the length effect. In this analysis, we also ignore the effect of the cone angle on stress. Figure 7 As shown, we define Figure 7 The following parameters are associated with:

[0088] R i : Shell inner diameter

[0089] R i ': Inner diameter of the housing after assembly

[0090] R o : Shell outer diameter

[0091] R o ': Outer diameter of the housing after assembly

[0092] r o : Core outer diameter

[0093] E: Young's modulus

[0094] ν : Poisson's ratio

[0095] σ: Internal pressure stress caused by interference fit

[0096] ΔR i : Inner diameter interference fit

[0097] f: Friction coefficient

[0098] Because the inner cylindrical core is subjected to uniform force, which belongs to the net water pressure and the bias pressure is zero, the core does not deform in this idealized scenario (in actual application, the core will also deform due to the influence of length. Therefore, the analysis here is for demonstration and does not affect the validity of the patent).

[0099] The inner diameter of the outer cylindrical shell before assembly is R i , which is smaller than the outer diameter r of the core o Because the outer diameter of the core r O In this ideal case, the inner diameter of the assembled housing is R i '=r o The interference fit produced by this mechanical assembly is:

[0100] ΔR i =R i -R ′ i =R i -r o

[0101] According to the parameters defined above, there is the following relationship between the change in the inner and outer diameters of the outer cylindrical shell after interference fit and the compressive stress generated on the contact surface (these calculation formulas are from Roark's Formulas of Stress and Strain, written by Warren C. Young):

[0102]

[0103] We further calculate an example, assuming the following parameters

[0104] R i : variables, and Relationship

[0105] R i ': 20 mm

[0106] r o : 20mm

[0107] E: 200 MPa

[0108] v: 0.3

[0109] σ: variable, and Relationship

[0110] ΔR i : The inner diameter interference fit, and Relationship

[0111] f: 0.4

[0112] P: 20 MPa (container pressure)

[0113] Using the above relationship, we get the friction force and interference ratio relationship, such as Figure 8 shown.

[0114] In this example, the thrust generated by the container on the core is about 8000 Newtons. If the thrust is supported by interference friction, the required interference ratio is About 0.03, equivalent to 0.6 mm interference. This is a demonstration, and finite element analysis (FEA) in actual applications will be more accurate.

[0115] When selecting the taper angle, the phenomenon of "friction self-locking" needs to be considered. If the taper angle is too large, the internal stress caused by the interference fit will overcome the friction of the contact surface and cause the core to pop out by itself. Figure 7 As shown, if the total internal stress force is F i , then the following relationship holds

[0116] F i =Aσ avg

[0117] The radial and axial components are:

[0118] F ir =F i cosα

[0119] F ia =F i sinα

[0120] The friction force along the cone surface is

[0121] F f =f F i

[0122] The radial and axial components are:

[0123] F fr =F f sinα=f F i sinα

[0124] F fa =F f cosα=f F i cosα

[0125] In order to prevent the core from popping out by itself, the component of the total internal stress force in the axial direction is F ia Need to be smaller than the component force F of the friction force in the axial direction fa ,

[0126] F ia <F fa

[0127] F i sinα <f F i cosα

[0128] It is concluded here

[0129]

[0130] Assuming the friction coefficient f = 0.4, the cone angle needs to be less than 21.8°. In practical applications, this angle can be much smaller than this critical value. According to the above example, if the average diameter of the core is 20 mm and the cone height is 5 mm, for ease of assembly, the diameter difference between the two ends of the cone is 0.5 mm, and the cone angle of 5.7° can be achieved, which is much smaller than the critical value when the friction coefficient is 0.4. If the friction coefficient changes, the critical value will change accordingly.

[0131] One or more embodiments of this specification are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this specification should be included in the scope of protection of this application.

[0132] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A packaging method for a sensor with high pressure resistance, characterized in that: include: A shell and a core are provided, wherein the shell is provided with a first mounting port and a second mounting port communicating with the interior thereof, wherein the first mounting port is used to communicate with the outlet of the pressure vessel, and the second mounting port is used to install the core, wherein the inner wall of the shell is provided with an inner conical surface, and the outer wall of the core is provided with an outer conical surface, and the tapers of the outer conical surface and the inner conical surface are equal; The core is installed in the housing so that the outer conical surface and the inner conical surface achieve interference fit.

2. The method according to claim 1, characterized in that The step of installing the core in the housing so that the outer conical surface and the inner conical surface achieve interference fit comprises: Heating the outer shell to expand it until the diameter of the inner cone surface is larger than the diameter of the outer cone surface; installing the core in the housing; The shell is restored to normal temperature to achieve interference fit between the outer conical surface and the inner conical surface.

3. The method according to claim 1, characterized in that The step of installing the core in the housing so that the outer conical surface and the inner conical surface achieve interference fit comprises: Cooling the core to shrink it until the diameter of the outer cone surface is smaller than the diameter of the inner cone surface; installing the core in the housing; The core body is restored to normal temperature to achieve interference fit between the outer conical surface and the inner conical surface.

4. The method according to claim 1, characterized in that: The step of installing the core in the housing so that the outer conical surface and the inner conical surface achieve interference fit comprises: The core body is pressed into the shell by using external force, so that the outer conical surface and the inner conical surface achieve interference fit.

5. The method according to claim 1, characterized in that The method further comprises: The gap between the core and the shell is sealed.

6. The method according to claim 5, characterized in that The step of sealing the gap between the core and the shell comprises: The gap between the core and the shell is sealed by welding.

7. A sensor with high pressure resistance, characterized in that: Prepared by the method according to any one of claims 1 to 6.

8. The sensor with high pressure resistance according to claim 7, characterized in that: There is an interference friction force between the core and the shell, and the interference friction force is greater than the thrust force applied to the core during detection.

9. The sensor with high pressure resistance according to claim 7, characterized in that: A seal is formed between the core and the housing.

10. The sensor with high pressure resistance according to claim 9, characterized in that: The core and the shell are sealed by welding.

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