Pressure sensor

Abstract

The utility model relates to the field of sensors, in particular to a pressure sensor, which comprises a mounting seat assembly, a pipe joint and a pressure core. The pipe joint and the pressure core body are respectively arranged on the mounting seat assembly, an inner cavity of the pipe joint and an inner cavity of the mounting seat assembly form a medium channel, and the pressure core body covers the medium channel located at the mounting seat assembly; a first buffer cavity is formed at the intersection of an inner cavity of the pipe joint and an inner cavity of the mounting seat assembly, the inner cavity of the mounting seat assembly comprises a flow guide channel and a second buffer cavity, the first buffer cavity and the second buffer cavity are communicated through the flow guide channel, and a circulation path of the flow guide channel is arranged to be zigzag. By arranging the zigzag flow guide channel and the second buffer cavity in the contour of the mounting seat assembly, compared with a buffer structure of a pressure sensor in the prior art, the number of the buffer structures is increased, the effect of reducing the pressure of hydraulic oil is better, and the buffer structure is suitable for a pressure sensor product with a large measuring range.

Description

Technical Field

[0001] The utility model relates to the field of sensors, in particular to a pressure sensor. Background Art

[0002] In the prior art, a patent document named pressure sensor with application number 202121462413.3 is provided; in this prior art, it is specifically provided with a shell, a pressure sensitive element, an open medium channel and a buffer structure; its buffer structure is specifically a buffer hole arranged on the buffer plate.

[0003] The above-mentioned technical solutions of the prior art can only be applied to pressure sensor products with relatively small measuring ranges;

[0004] The reason why it is not suitable for products with a relatively large range of pressure sensors is that the buffering function of the buffer structure of the pressure sensor does not match the pressure of the hydraulic oil that can be poured into the product with a relatively large range of pressure sensors, resulting in the hydraulic oil still maintaining a relatively large hydraulic pressure after flowing through the buffer structure. When the hydraulic pressure of the hydraulic oil is relatively large, the hydraulic oil will damage the pressure core diaphragm, causing the functional failure of the pressure sensor.

[0005] Therefore, how to redesign a pressure sensor so that the hydraulic pressure of the hydraulic oil cannot damage the pressure core diaphragm of the pressure sensitive element after the hydraulic oil flows through the buffer structure of the pressure sensor becomes a technical problem to be solved. Utility Model Content

[0006] In order to solve the technical problem of how to redesign a pressure sensor so that the hydraulic pressure of the hydraulic oil cannot damage the pressure core diaphragm of the pressure sensitive element after the hydraulic oil flows through the buffer structure of the pressure sensor, the utility model provides a pressure sensor.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] According to one aspect of the utility model, there is provided a pressure sensor, comprising a mounting seat assembly, a pipe joint and a pressure core;

[0009] The pipe joint and the pressure core are respectively arranged on the mounting seat assembly, the inner cavity of the pipe joint and the inner cavity of the mounting seat assembly form a medium channel, and the pressure core covers the medium channel located at the mounting seat assembly;

[0010] A first buffer cavity is formed at the intersection of the inner cavity of the pipe joint and the inner cavity of the mounting seat assembly, the inner cavity of the mounting seat assembly includes a guide channel and a second buffer cavity, the first buffer cavity and the second buffer cavity are connected through the guide channel, wherein the flow path of the guide channel is set to be tortuous;

[0011] The first buffer cavity, the flow guiding channel and the second buffer cavity are respectively parts of the medium channel.

[0012] Further, the mounting seat assembly includes a first component and a second component;

[0013] The first component is used to set the pressure core, wherein the first component is provided with a first working surface, the first working surface is parallel to the axis of the mounting seat assembly, and a guide groove is concavely provided on the first working surface;

[0014] The second component is provided with a second working surface, and the second working surface is parallel to the axis of the mounting seat assembly;

[0015] The first working surface and the second working surface are configured to be face-to-face and in contact with each other, and the inner wall of the guide groove and the second working surface are jointly limited to form the guide channel.

[0016] Further, the guide groove is configured with a first groove section, a second groove section and a third groove section;

[0017] The first slot section and the third slot section are configured to be parallel to the axis of the mounting seat assembly, respectively, and the second slot section is configured to be parallel to one diameter of the mounting seat assembly;

[0018] Both ends of the second slot section are respectively connected to the first slot section and the third slot section, and one end of the first slot section extends to the end surface of the first component facing the pipe joint.

[0019] Furthermore, a buffer groove is recessed on the first working surface;

[0020] The buffer groove is communicated with the guide groove;

[0021] The inner wall of the buffer groove and the second working surface together define the second buffer cavity.

[0022] Further, the first component is provided with a first mounting portion and a second mounting portion;

[0023] The first mounting portion is provided with a first plane and a second plane, a first preset angle is formed between the first plane and the second plane, and the first plane and the second plane are respectively parallel to the axis of the mounting seat assembly;

[0024] The second mounting portion is provided with a third plane, and the third plane is parallel to the axis center line of the mounting seat assembly;

[0025] The first plane and the third plane are coplanar and constitute the first working surface;

[0026] The second component is provided with a third mounting portion and a fourth mounting portion;

[0027] The third mounting portion is provided with a fourth plane and a fifth plane, the fourth plane and the fifth plane form a second preset angle, and the fourth plane and the fifth plane are respectively parallel to the axis of the mounting seat assembly;

[0028] The fourth mounting portion is provided with a sixth plane, and the sixth plane is parallel to the axis center line of the mounting seat assembly;

[0029] The fourth plane and the sixth plane are coplanar and constitute the second working plane;

[0030] The second plane and the fifth plane are configured to be face-to-face with each other.

[0031] Further, the combined structure of the first mounting portion and the third mounting portion is configured as a first cylindrical structure, and the combined structure of the second mounting portion and the fourth mounting portion is configured as a second cylindrical structure;

[0032] The diameter of the first cylindrical structure is greater than the diameter of the second cylindrical structure;

[0033] The axis line of the first cylindrical structure and the axis line of the second cylindrical structure are arranged coaxially.

[0034] Furthermore, the first component is provided with a mounting cavity and a flow guide hole, one end of the flow guide hole is communicated with the mounting cavity, and the other end of the flow guide hole is communicated with the flow guide channel;

[0035] The installation cavity and the surface of the first component form an opening, and the pressure core is inserted into the installation cavity through the opening;

[0036] The installation cavity and the flow-conducting hole are respectively a part of the medium channel.

[0037] Further, the pipe joint comprises a cone head portion, a middle portion and an assembly portion;

[0038] The middle portion is located between the cone head portion and the assembly portion, and the cone head portion, the middle portion and the assembly portion are configured to be coaxially arranged, wherein the cone head portion is penetrated by a circulation channel, the circulation channel is communicated with the first buffer cavity, and the circulation channel is a part of the medium channel;

[0039] The assembling portion is provided with a circular groove, which is recessed in the end surface of the assembling portion, wherein the second mounting portion and the fourth mounting portion are jointly arranged in the circular groove, and the first mounting portion and the third mounting portion are jointly arranged outside the circular groove.

[0040] Furthermore, the gap between the first component and the second component is laser welded to form a sealed connection.

[0041] Furthermore, the gap between the mounting seat assembly and the pipe joint is laser welded to form a sealed connection;

[0042] The gap between the pressure core and the mounting seat assembly is laser welded to form a sealed connection.

[0043] The above technical solution has the following advantages or beneficial effects:

[0044] The pressure sensor provided by the utility model has a first buffer cavity provided between the mounting seat assembly and the pipe joint, and has a zigzag flow guide channel and a second buffer cavity provided inside the contour of the mounting seat assembly. Compared with the buffer structure of the pressure sensor in the prior art, the number of buffer structures is increased, so that the pressure sensor of this embodiment has a better effect of reducing the pressure of the hydraulic oil, and is suitable for products with a relatively large range of pressure sensors. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A schematic diagram of the structure of a pressure sensor provided in Example 1 of the utility model;

[0046] Figure 2 A schematic diagram of the split structure of the pressure sensor provided in Example 1 of the utility model;

[0047] Figure 3 A cross-sectional view of a pressure sensor provided in Example 1 of the utility model;

[0048] Figure 4 A schematic diagram of the structure of the first component provided in Example 1 of the utility model;

[0049] Figure 5 A schematic diagram of the structure of the second component provided in Example 1 of the utility model;

[0050] Figure 6A schematic diagram of the structure of the first component provided in Example 1 of the utility model;

[0051] Figure 7 A schematic diagram of the structure of the second component provided in Example 1 of the utility model;

[0052] Figure 8 A schematic diagram of the structure of the first component provided in Example 1 of the utility model;

[0053] Fig. 9 A schematic diagram of the structure of the first component provided in Example 1 of the utility model;

[0054] Fig.10 A schematic diagram of the structure of the second component provided in Example 1 of the utility model;

[0055] Fig.11 A schematic diagram of the structure of the first component provided in Example 1 of the utility model;

[0056] Fig.12 A schematic diagram of the structure of the second component provided in Example 1 of the utility model;

[0057] Fig.13 A schematic diagram of the structure of a pipe joint provided in Example 1 of the utility model;

[0058] Fig.14 This is a cross-sectional view of the pipe joint provided in Example 1 of the utility model. DETAILED DESCRIPTION

[0059] Embodiment 1:

[0060] In this embodiment, see Figures 1 to 3 , providing a pressure sensor, comprising a mounting seat assembly 1, a pipe joint 2 and a pressure core 3;

[0061] The pipe joint 2 and the pressure core 3 are respectively arranged on the mounting seat assembly 1, the inner cavity of the pipe joint 2 and the inner cavity of the mounting seat assembly 1 form a medium channel, and the pressure core 3 covers the medium channel located at the mounting seat assembly 1;

[0062] The intersection of the inner cavity of the pipe joint 2 and the inner cavity of the mounting seat assembly 1 forms a first buffer cavity 001, and the inner cavity of the mounting seat assembly 1 includes a flow guide channel 002 and a second buffer cavity 003. The first buffer cavity 001 and the second buffer cavity 003 are connected through the flow guide channel 002, wherein the flow path of the flow guide channel 002 is set to be tortuous;

[0063] The first buffer cavity 001 , the flow guiding channel 002 , and the second buffer cavity 003 are respectively a part of the medium channel.

[0064] As mentioned in the aforementioned background technology section, the pressure sensor in the prior art (named as pressure sensor, application number is 202121462413.3, unless otherwise specified, the prior art will be referred to as the prior art in the following content) has only a single buffer structure, specifically a buffer hole; the decompression principle of the buffer hole is that after the liquid flows through the buffer hole, the liquid suddenly enters a relatively large buffer space, so that the liquid is in a relatively dispersed motion state in the buffer space, resulting in a decrease in the pressure of the liquid in the buffer space.

[0065] In this embodiment, on the one hand, the principle of the buffer hole in the above-mentioned prior art is adopted, and a second buffer chamber 003 structure is added to the pressure sensor of this embodiment, so as to further reduce the pressure of the hydraulic oil; on the other hand, the pressure sensor of this embodiment is also provided with a guide channel 002, and the flow path through the guide channel 002 is set to be tortuous, so that the hydraulic oil flowing through the guide channel 002 changes direction for many times in the tortuous flow path, and each change of direction can reduce the pressure of the hydraulic oil.

[0066] For details, see Figure 3 In this embodiment, the interior of the mounting seat assembly 1 is processed with a guide channel 002 and a second buffer cavity 003. In other words, the guide channel 002 and the second buffer cavity 003 are completely confined within the contour range of the mounting seat assembly 1;

[0067] The flow guide channel 002 and the second buffer cavity 003 can be processed by a milling machine or a lathe.

[0068] See also Figure 3 The guide channel 002 is arranged to be zigzag, which at least includes a structure for changing the flow direction, so that the pressure of the hydraulic oil is reduced when the hydraulic oil flows through the guide channel 002; the structure for changing the flow direction should be understood as a right-angled channel structure, or an acute-angled channel structure, or an obtuse-angled channel structure, etc.

[0069] It should be understood that the specific shape of the guide channel 002 is not specifically limited here, and the guide channel 002 can be specifically set to a square wave or triangular wave structure, as long as it can be processed by the aforementioned milling machine or lathe.

[0070] It should be understood that the second buffer chamber 003 can be processed by a milling machine or a lathe; in addition, the specific shape of the second buffer chamber 003 is not specifically limited here, and the second buffer chamber 003 can be set to a shape with a radial cross-section of a circular, square, or arc-shaped cavity, as long as the space occupied by the second buffer chamber 003 is significantly larger than the discharge port of the guide channel 002; wherein, the discharge port of the guide channel 002 should be located at the intersection of the guide channel 002 and the second buffer chamber 003.

[0071] The mounting seat assembly 1, the pipe joint 2 and the pressure core 3 are assembled and sealed, and at this time, the inner cavity of the mounting seat assembly 1 and the inner cavity of the pipe joint 2 form a medium channel; specifically, a part of the medium channel passes through the pipe joint 2, and the rest of the medium channel is limited within the contour range of the mounting seat assembly 1 and the pipe joint 2, and one end of the medium channel forms a medium inlet with the end of the pipe joint 2, and the other end of the medium channel communicates with the position of the mounting seat assembly 1 for installing the pressure core 3, so that the hydraulic oil can reach the pressure core 3 after flowing through the medium channel;

[0072] It should be understood that the medium channel is used for circulating liquid or gas. Unless otherwise specified, in this embodiment, the medium channel is used for circulating hydraulic oil.

[0073] It should be understood that the specific structure of the pressure core 3 is configured the same as the pressure sensitive element in the prior art, that is, the pressure core 3 also has a pressure core diaphragm, and the pressure core diaphragm is used to receive the pressure of the hydraulic oil.

[0074] It should be understood that when the pressure core 3 is arranged on the mounting seat assembly 1, the connection method between the pressure core 3 and the mounting seat assembly 1 can be set to the connection method of the pressure sensitive element and the shell in the prior art, so that there is no buffer structure between the pressure core 3 and the mounting seat assembly 1; a preferred structure is that a certain gap is left between the pressure core diaphragm of the pressure core 3 and the mounting seat, so that a third buffer cavity is formed between the pressure core diaphragm and the mounting seat, so as to better reduce the pressure of the hydraulic oil; on the basis of having the third buffer cavity, a through hole should also be provided on the mounting seat assembly located between the second buffer cavity and the third buffer cavity, so that the second buffer cavity and the third buffer cavity are connected, wherein the diameter of the through hole is smaller than the diameter of the second buffer cavity and smaller than the diameter of the third buffer cavity.

[0075] It should be understood that since the pressure sensor of this embodiment is provided with multiple buffer structures (the first buffer chamber 001, the second buffer chamber 003 and the tortuous guide channel 002, etc.), the pressure of the hydraulic oil in the pipe joint is different from the pressure in the first buffer chamber 001, the second buffer chamber 003 and the guide channel 002.

[0076] Based on all the above, the pressure sensor of this embodiment has a first buffer cavity 001 provided between the mounting seat assembly 1 and the pipe joint 2, and has a tortuous guide channel 002 and a second buffer cavity 003 provided inside the contour of the mounting seat assembly 1. Compared with the buffer structure of the pressure sensor in the prior art, the number of buffer structures is increased, so that the pressure sensor of this embodiment has a better effect of reducing the pressure of the hydraulic oil, and is suitable for products with a relatively large range of pressure sensors.

[0077] Therefore, the pressure sensor of this embodiment solves the technical problem of how to redesign a pressure sensor so that after the hydraulic oil flows through the buffer structure of the pressure sensor, the hydraulic pressure of the hydraulic oil cannot damage the pressure core diaphragm of the pressure sensitive element.

[0078] Furthermore, in the aforementioned content, how to set the guide channel 002 and the second buffer cavity 003 inside the mounting seat assembly 1 becomes a technical problem to be solved.

[0079] In this embodiment, the mounting seat assembly 1 is configured as two parts, and machining is performed on one of the parts. After the two parts are combined together, the guide channel 002 and the second buffer cavity 003 are formed.

[0080] For details, see Figure 2 , Figures 4 to 7 , the mounting seat assembly 1 includes a first component 110 and a second component 120;

[0081] The first component 110 is used to set the pressure core 3, wherein the first component 110 is provided with a first working surface 111, the first working surface 111 and the axis of the mounting seat assembly 1 are parallel to each other, and a guide groove 112 is recessed on the first working surface 111;

[0082] The second component 120 is provided with a second working surface 121, and the second working surface 121 is parallel to the axis of the mounting seat assembly 1;

[0083] The first working surface 111 and the second working surface 121 are configured to be face-to-face and in contact with each other, and the inner wall of the guide groove 112 and the second working surface 121 are jointly limited to form a guide channel 002 .

[0084] Before the first component 110 and the second component 120 are assembled into the mounting seat assembly 1, the first component 110 and the second component 120 are two independent and separate parts; the first working surface 111 on the first component 110 provides a processing object for processing the guide channel 002. Specifically, the guide groove 112 on the first working surface 111 is obtained by using the aforementioned lathe or milling machine; correspondingly, a second working surface 121 is provided on the second component 120. When the second working surface 121 is covered on the second working surface 121, a guide channel 002 is formed between the inner wall of the guide groove 112 and the second working surface 121.

[0085] It should be understood that the first working surface 111 and the second working surface 121 are respectively planes, so as to facilitate machining of the first component 110 by a milling machine or a lathe.

[0086] It should be understood that the specific shapes or contours of the first working surface 111 and the second working surface 121 can be configured into a variety of shapes or contours. For example, the shapes or contours of the first working surface 111 and the second working surface 121 are respectively configured as rectangles, triangles, sectors, trapezoids, etc.; as long as the first working surface 111 can be processed into a zigzag guide groove 112; in the following content, a preferred specific shape and contour of the first working surface 111 and the second working surface 121 are specifically proposed, which will not be mentioned here for the time being.

[0087] It should be understood that the mounting seat assembly 1 composed of the first component 110 and the second component 120 has a circular cross section perpendicular to the axis, so that the mounting seat assembly 1 is cylindrical or approximately cylindrical as a whole.

[0088] For further information, see Figures 8 to 9 In order to facilitate the understanding of those skilled in the art, this embodiment proposes the following preferred structure of the guide groove 112;

[0089] The guide groove 112 is configured with a first groove section 1121, a second groove section 1122 and a third groove section 1123;

[0090] The first slot section 1121 and the third slot section 1123 are configured to be parallel to the axis of the mounting seat assembly 1 respectively, and the second slot section 1122 is configured to be parallel to one diameter of the mounting seat assembly 1;

[0091] Both ends of the second groove section 1122 are connected to the first groove section 1121 and the third groove section 1123 respectively, and one end of the first groove section 1121 extends to the end surface of the first component 110 facing the pipe joint 2 .

[0092] Among them, the first groove section 1121, the second groove section 1122 and the third groove section 1123 of the guide groove 112 are respectively recessed in the first working surface 111 of the first component 110; along the axial direction of the mounting seat assembly 1, the first groove section 1121 and the third groove section 1123 are configured to be parallel to each other and leave a spacing, one end of the first groove section 1121 extends to the end surface of the first component 110 to form a mouth, and the opening direction of the mouth is in the same direction as the extension direction of the first groove section 1121; the two ends of the second groove section 1122 are respectively connected to the first groove section 1121 and the third groove section 1123.

[0093] A first right-angled corner is formed between the first slot section 1121 and the second slot section 1122, and a second right-angled corner is formed between the second slot section 1122 and the third slot section 1123, so that when the hydraulic oil flows through the guide slot 112, a first pressure reduction phenomenon is achieved at the first corner, and a second pressure reduction phenomenon is achieved at the second corner;

[0094] It should be understood that, as mentioned in the foregoing content, the guide groove 112 is connected to the second buffer chamber 003; the second buffer chamber 003 and the third groove section 1123 form a third corner at a right angle or other angle, so that the hydraulic oil flowing from the guide groove 112 to the second buffer chamber 003 achieves a third pressure reduction phenomenon at the third corner.

[0095] It should be understood that in other embodiments, the guide groove 112 can also be divided into multiple sections, each of which is a straight groove section, and adjacent groove sections can be configured to be right-angled or other angles, as long as multiple groove sections can be processed on the first working surface 111 by a milling machine or a lathe.

[0096] It should be understood that, according to the case where the specific structures of the first component 110 and the second component 120 are configured as a variety of combination structures, the guide groove 112 can also be processed on the second working surface 121; for example, when the first component 110 and the second component 120 are configured as a mirror-symmetrical structure, the first working surface 111 and the second working surface 121 can be processed with the guide groove 112 respectively, wherein the contour of the guide groove 112 on the first working surface 111 and the contour of the guide groove 112 on the second working surface 121 are in a mirror-symmetrical structure, so that the two guide grooves 112 can overlap each other and form a guide channel 002.

[0097] Furthermore, in order to facilitate understanding by those skilled in the art, a preferred second buffer cavity 003 structure is provided in this embodiment.

[0098] For details, see Figure 6 or Figure 8 A buffer groove 113 is also recessed on the first working surface 111;

[0099] The buffer groove 113 is communicated with the guide groove 112;

[0100] The inner wall of the buffer groove 113 and the second working surface 121 together define a second buffer cavity 003 .

[0101] Among them, the buffer groove 113 is recessed in the first working surface 111, and the groove depth of the buffer groove 113 is greater than the groove depth of the aforementioned guide groove 112. When observed from the direction of the axial centerline and the radial direction of the mounting seat assembly 1, the buffer groove 113 is a linear groove; or, the groove depth of the buffer groove 113 is greater than the groove depth of the aforementioned guide groove 112. When observed from the direction of the axial centerline of the mounting seat assembly 1, the buffer groove 113 is a fan-shaped groove, and when observed from the radial direction of the mounting seat assembly 1, the buffer groove 113 is a linear groove.

[0102] When the second working surface 121 covers the buffer groove 113 , a second buffer cavity 003 is formed between the inner wall of the buffer groove 113 and the second working surface 121 .

[0103] The groove depth of the buffer groove 113 is configured to be greater than the groove depth of the guide groove 112, so that the cross-sectional profile of the second buffer cavity 003 is greater than the cross-sectional profile of the guide channel 002, so that the second buffer cavity 003 forms a relatively wide buffer space relative to the guide channel 002, so that the hydraulic oil is in a relatively dispersed motion state in the buffer space, resulting in a reduction in the pressure of the hydraulic oil in the buffer cavity.

[0104] Furthermore, in order to facilitate the understanding of those skilled in the art, this embodiment provides a preferred structure of the mounting seat assembly 1;

[0105] For details, see Figures 9 to 12 , the first component 110 is provided with a first mounting portion A1 and a second mounting portion A2;

[0106] The first mounting portion A1 is provided with a first plane S1 and a second plane S2, a first preset angle is formed between the first plane S1 and the second plane S2, and the first plane S1 and the second plane S2 are parallel to the axis of the mounting seat assembly 1 respectively;

[0107] The second mounting portion A2 is provided with a third plane S3, and the third plane S3 is parallel to the axis center line of the mounting seat assembly 1;

[0108] The first plane S1 and the third plane S3 are coplanar and constitute a first working surface 111;

[0109] The second component 120 is provided with a third mounting portion A3 and a fourth mounting portion A4;

[0110] The third mounting portion A3 is provided with a fourth plane S4 and a fifth plane S5, the fourth plane S4 and the fifth plane S5 form a second preset angle, and the fourth plane S4 and the fifth plane S5 are respectively parallel to the axis of the mounting seat assembly 1;

[0111] The fourth mounting portion A4 is provided with a sixth plane S6, and the sixth plane S6 is parallel to the axis of the mounting seat assembly 1;

[0112] The fourth plane S4 and the sixth plane S6 are coplanar and constitute a second working surface 121;

[0113] The second plane S2 and the fifth plane S5 are configured to be face-to-face with each other.

[0114] Among them, the first mounting part A1 and the second mounting part A2 of the first component 110 are made as one piece, and the first mounting part A1 and the second mounting part A2 are arranged sequentially along the axial direction of the mounting seat assembly 1; the first plane S1 and the second plane S2 of the first mounting part A1 form a first preset angle, so that the space between the first plane S1 and the second plane S2 forms a positioning space for positioning the second component 120, and the first plane S1 and the second plane S2 have the function of positioning the second component 120.

[0115] Correspondingly, the third mounting portion A3 and the fourth mounting portion A4 of the second component 120 are integrally formed, and along the axial centerline direction of the mounting seat assembly 1, the third mounting portion A3 and the fourth mounting portion A4 are arranged in sequence; the fourth plane S4 and the fifth plane S5 of the third mounting portion A3 form a second preset angle, and the sum of the second preset angle and the aforementioned first preset angle is 360 degrees; thus, the third mounting portion A3 is used to be positioned in the positioning space between the aforementioned first plane S1 and the second plane S2, the fourth plane S4 forms a surface-to-surface contact positioning structure with the first plane S1, and the fifth plane S5 forms a surface-to-surface contact positioning structure with the second plane S2;

[0116] Since the first plane S1 and the third plane S3 together constitute the aforementioned first working surface 111, and since the fourth plane S4 and the sixth plane S6 together constitute the aforementioned second working surface 121, the first working surface 111 and the fourth plane S4 actually form a surface-to-surface contact positioning structure, and the second working surface 121 and the fifth plane S5 form a surface-to-surface contact positioning structure, on this basis, the positioning function between the first component 110 and the second component 120 is formed.

[0117] It should be understood that after the first component 110 and the second component 120 are positioned, the first component 110 and the second component 120 need to be fixed, for example, by welding, so as to avoid the first component 110 and the second component 120 being separated from each other.

[0118] It should be understood that if the first preset angle is configured to 270 degrees, the second preset angle is configured to 90 degrees; or, if the first preset angle is configured to 235 degrees, the second preset angle is configured to 125 degrees; or, if the first preset angle is configured to 300 degrees, the second preset angle is configured to 60 degrees; therefore, those skilled in the art should understand that the first preset angle and the second preset angle can be configured to a variety of angles, as long as the sum of the first preset angle and the second preset angle satisfies 360 degrees.

[0119] Furthermore, in certain application scenarios, the pressure of the hydraulic oil is relatively large, and the aforementioned mounting seat assembly 1, pipe joint 2 and pressure core 3 need to be welded separately; in order to increase the welding area and improve the welding efficiency of the welded pressure sensor, this embodiment further optimizes the aforementioned scheme.

[0120] Specifically, the combined structure of the first mounting portion A1 and the third mounting portion A3 is configured as a first cylindrical structure, and the combined structure of the second mounting portion A2 and the fourth mounting portion A4 is configured as a second cylindrical structure;

[0121] The diameter of the first cylindrical structure is greater than the diameter of the second cylindrical structure;

[0122] The axis of the first cylindrical structure is arranged coaxially with the axis of the second cylindrical structure.

[0123] Among them, the first cylindrical structure and the second cylindrical structure together constitute a step structure, and the second cylindrical structure can be inserted into the pipe joint 2, so that the mounting seat assembly 1 and the pipe joint 2 partially overlap, thereby increasing the contact area between the two.

[0124] At the same time, the space between the first cylindrical structure and the second cylindrical structure forms a welding area. Specifically, when the second cylindrical structure is inserted into the pipe joint 2, the gap between the pipe joint 2 and the end face of the first cylindrical structure at the welding area forms a welding object, and an angle is formed between the end face of the first cylindrical structure and the outer circumferential surface of the pipe joint 2. Compared with the structure that forms a right angle between the circumferential surface of the first cylindrical structure and the outer circumferential surface of the pipe joint 2, the welding area of ​​the welding gun contacting the two components is increased; on the basis of increasing the welding area, the welding work on the gap can be completed at one time, thereby improving the welding efficiency.

[0125] Corresponding to the above scheme, see Fig.13 and Fig.14 In this embodiment, the pipe joint 2 includes a cone head 210, a middle portion 220 and an assembly portion 230;

[0126] The middle portion 220 is located between the cone head portion 210 and the assembly portion 230. The cone head portion 210, the middle portion 220 and the assembly portion 230 are configured to be coaxially arranged, wherein the cone head portion 210 is penetrated by a circulation channel 240, the circulation channel 240 is communicated with the first buffer cavity 001, and the circulation channel 240 is a part of the medium channel;

[0127] The assembling portion 230 is provided with a circular groove 250 , which is recessed in the end surface of the assembling portion 230 , wherein the second mounting portion A2 and the fourth mounting portion A4 are jointly arranged in the circular groove 250 , and the first mounting portion A1 and the third mounting portion A3 are jointly arranged outside the circular groove 250 .

[0128] Among them, the circular groove 250 arranged on the assembly part 230 of the pipe joint 2 is used to accommodate the aforementioned second cylindrical structure; when the second cylindrical structure is arranged in the circular groove 250, the gap between the second cylindrical structure and the groove bottom surface of the circular groove 250 forms the aforementioned first buffer cavity 001; the flow channel 240 arranged along the head part and the middle part 220 is connected to the first buffer cavity 001.

[0129] It should be understood that the cone head portion 210 , the middle portion 220 and the assembling portion 230 are made as one piece, and the circular groove 250 is recessed in the end surface of the assembling portion 230 .

[0130] It should be understood that the circulation channel 240, the first buffer cavity 001, the guide channel 002 and the second buffer cavity 003 are connected in sequence; if the aforementioned third buffer cavity is provided, the circulation channel 240, the first buffer cavity 001, the guide channel 002, the second buffer cavity 003 and the third buffer cavity are connected in sequence.

[0131] Furthermore, in all the above solutions, laser welding is used at the gap between the first component 110 and the second component 120 to form a sealed connection.

[0132] Among them, any gap between the first component 110 and the second component 120 needs to be welded, so as to improve the strength of the first component 110 and the second component 120, while improving the sealing reliability between the first component 110 and the second component 120, and preventing the hydraulic oil from flowing out of the gap between the first component 110 and the second component 120.

[0133] Furthermore, in all the aforementioned solutions, the gap between the mounting seat assembly 1 and the pipe joint 2 is laser welded to form a sealed connection;

[0134] The gap between the pressure core 3 and the mounting seat assembly 1 is laser welded to form a sealed connection.

[0135] The above two sealing connections are respectively formed by laser welding process, which on the one hand improves the strength between the two adjacent components, and on the other hand improves the sealing reliability to prevent the hydraulic oil from flowing out from the gap between the two adjacent components.

[0136] Laser welding is a commonly used process for manufacturing pressure sensors and will not be described in detail here.

[0137] In addition to all the aforementioned contents, in this embodiment, the conical head of the pipe joint is preferably configured as a conical head with a cone angle of 74 degrees; the aforementioned pressure core preferably adopts a pressure core structure with an external thread and a top flange, and correspondingly, a mounting cavity for mounting the pressure core is provided on the first component of the aforementioned mounting seat assembly, and an internal thread is provided on the inner wall of the mounting cavity, so that the external thread of the pressure core and the internal thread of the mounting cavity can form a first connection structure, and a step portion protruding from the first component is arranged around the mouth of the mounting cavity, so that the flange of the pressure core can contact the step portion, and when the flange and the step portion are welded, since the step portion protrudes from the first component, it is convenient for the tip of the welding gun to contact the gap between the flange and the step portion, thereby improving welding efficiency and reliability, and then forming a second connection structure after welding; in the pressure sensor having both the first connection structure and the second connection structure, the strength between the pressure core and the mounting seat assembly is higher, and it is more suitable for use in a large-range pressure sensor.

[0138] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, is also included in the patent protection scope of the present invention.

Claims

1. A pressure sensor, characterized in that Includes a mounting base assembly, a pipe joint and a pressure core; The pipe joint and the pressure core are respectively arranged on the mounting seat assembly, the inner cavity of the pipe joint and the inner cavity of the mounting seat assembly form a medium channel, and the pressure core covers the medium channel located at the mounting seat assembly; A first buffer cavity is formed at the intersection of the inner cavity of the pipe joint and the inner cavity of the mounting seat assembly, the inner cavity of the mounting seat assembly includes a guide channel and a second buffer cavity, the first buffer cavity and the second buffer cavity are connected through the guide channel, wherein the flow path of the guide channel is set to be tortuous; The first buffer cavity, the flow guiding channel and the second buffer cavity are respectively parts of the medium channel.

2. The pressure sensor according to claim 1, characterized in that: The mounting seat assembly includes a first component and a second component; The first component is used to set the pressure core, wherein the first component is provided with a first working surface, the first working surface is parallel to the axis of the mounting seat assembly, and a guide groove is concavely provided on the first working surface; The second component is provided with a second working surface, and the second working surface is parallel to the axis of the mounting seat assembly; The first working surface and the second working surface are configured to be face-to-face and in contact with each other, and the inner wall of the guide groove and the second working surface are jointly limited to form the guide channel.

3. The pressure sensor according to claim 2, characterized in that: The guide groove is configured with a first groove section, a second groove section and a third groove section; The first slot section and the third slot section are configured to be parallel to the axis of the mounting seat assembly, respectively, and the second slot section is configured to be parallel to one diameter of the mounting seat assembly; Both ends of the second slot section are respectively connected to the first slot section and the third slot section, and one end of the first slot section extends to the end surface of the first component facing the pipe joint.

4. The pressure sensor according to claim 2, characterized in that: The first working surface is also provided with a buffer groove in a recessed manner; The buffer groove is communicated with the guide groove; The inner wall of the buffer groove and the second working surface together define the second buffer cavity.

5. The pressure sensor according to claim 2, characterized in that: The first component is provided with a first mounting portion and a second mounting portion; The first mounting portion is provided with a first plane and a second plane, a first preset angle is formed between the first plane and the second plane, and the first plane and the second plane are respectively parallel to the axis of the mounting seat assembly; The second mounting portion is provided with a third plane, and the third plane is parallel to the axis center line of the mounting seat assembly; The first plane and the third plane are coplanar and constitute the first working surface; The second component is provided with a third mounting portion and a fourth mounting portion; The third mounting portion is provided with a fourth plane and a fifth plane, the fourth plane and the fifth plane form a second preset angle, and the fourth plane and the fifth plane are respectively parallel to the axis of the mounting seat assembly; The fourth mounting portion is provided with a sixth plane, and the sixth plane is parallel to the axis center line of the mounting seat assembly; The fourth plane and the sixth plane are coplanar and constitute the second working plane; The second plane and the fifth plane are configured to be face-to-face with each other.

6. The pressure sensor according to claim 5, characterized in that: The combined structure of the first mounting portion and the third mounting portion is configured as a first cylindrical structure, and the combined structure of the second mounting portion and the fourth mounting portion is configured as a second cylindrical structure; The diameter of the first cylindrical structure is greater than the diameter of the second cylindrical structure; The axis line of the first cylindrical structure and the axis line of the second cylindrical structure are arranged coaxially.

7. The pressure sensor according to claim 5, characterized in that: The first component is provided with a mounting cavity and a flow guide hole, one end of the flow guide hole is communicated with the mounting cavity, and the other end of the flow guide hole is communicated with the flow guide channel; The installation cavity and the surface of the first component form an opening, and the pressure core is inserted into the installation cavity through the opening; The installation cavity and the flow-conducting hole are respectively a part of the medium channel.

8. The pressure sensor according to claim 6, characterized in that: The pipe joint comprises a cone head, a middle part and an assembly part; The middle portion is located between the cone head portion and the assembly portion, and the cone head portion, the middle portion and the assembly portion are configured to be coaxially arranged, wherein the cone head portion is penetrated by a circulation channel, the circulation channel is communicated with the first buffer cavity, and the circulation channel is a part of the medium channel; The assembling portion is provided with a circular groove, which is recessed in the end surface of the assembling portion, wherein the second mounting portion and the fourth mounting portion are jointly arranged in the circular groove, and the first mounting portion and the third mounting portion are jointly arranged outside the circular groove.

9. The pressure sensor according to claim 2, characterized in that: The gap between the first component and the second component is welded by laser to form a sealed connection.

10. The pressure sensor according to claim 1, characterized in that: The gap between the mounting seat assembly and the pipe joint is laser welded to form a sealed connection; The gap between the pressure core and the mounting seat assembly is laser welded to form a sealed connection.

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