Sensor assembly and filter

Abstract

The utility model relates to a sensor assembly and a filter. The sensor assembly comprises a carrier, an electric signal processing element, a pressure sensor and a protection piece. The carrier is provided with a first accommodating cavity and a fluid channel, and the fluid channel is communicated with the first accommodating cavity and a fluid source; the electric signal processing element is arranged on the carrier; the pressure sensor is arranged in the first accommodating cavity, the pressure sensor is electrically connected with the electric signal processing element, and the pressure sensor is provided with a detection port; the protection piece is arranged between the detection opening and the fluid channel to protect the detection opening. The sensor assembly provided by the utility model can prevent impurities with larger volume in the fluid from blocking the detection port of the pressure sensor, avoids the failure of the pressure sensor, and is helpful for the pressure sensor to continuously and stably measure the fluid pressure.

Description

Technical Field

[0001] The present application relates to the technical field of fuel filtration, and in particular to a sensor assembly and a filter. Background Art

[0002] Pressure sensors can sense the pressure of substances such as gas fuel, liquid fuel, exhaust gas or refrigerant. By transmitting the collected data of parameters such as pressure to the on-board computer or data processing system, the on-board computer and other data processing systems can automatically adjust the processing actions according to the pressure, such as the degree of heating of the liquid fuel.

[0003] However, when measuring the pressure of liquid fuels such as diesel, traditional pressure sensors are easily blocked by impurities in the liquid fuel, causing the pressure sensor to fail. Utility Model Content

[0004] Based on this, it is necessary to provide a sensor assembly and a filter to address the problem that impurities in the liquid can easily cause the pressure sensor to fail.

[0005] On the one hand, the present application provides a sensor assembly, which includes: a carrier, provided with a first accommodating cavity and a fluid channel, wherein the fluid channel connects the first accommodating cavity and a fluid source; an electrical signal processing element, arranged in the carrier; a pressure sensor, arranged in the first accommodating cavity, the pressure sensor is electrically connected to the electrical signal processing element, and the pressure sensor is provided with a detection port; wherein the sensor assembly also includes a protective member, which is arranged between the detection port and the fluid channel to protect the detection port.

[0006] In one embodiment, the protective member is cup-shaped and covers the detection port. The protective member is provided with a circular through hole. The radial cross-section of the detection port is circular, and the diameter of the through hole is smaller than the diameter of the detection port.

[0007] In one embodiment, the radial cross-section of the fluid channel is circular, and the diameter of the fluid channel is larger than the diameter of the through hole.

[0008] In one embodiment, the diameter of the through hole is less than one third of the diameter of the detection port.

[0009] In one embodiment, the diameter of the through hole is less than 0.3 mm.

[0010] In one embodiment, the diameter of the detection port is greater than 0.8 mm.

[0011] In one embodiment, the sensor assembly further includes a heating assembly. The sensor assembly is provided with a second accommodating cavity, the second accommodating cavity is arranged opposite to the first accommodating cavity, and the heating assembly is arranged in the second accommodating cavity to heat the fluid.

[0012] In one embodiment, the second accommodating chamber is connected to the fluid source, and the fluid channel is connected to the first accommodating chamber and the second accommodating chamber.

[0013] In one embodiment, a water level sensor is further included, wherein the water level sensor includes an extension portion and an electrode, wherein the extension portion is in the shape of an elongated strip, and one end of the extension portion is connected to the carrier, and the extension portion extends in a direction away from the first accommodating cavity, and the electrode is arranged at the end of the extension portion away from the carrier, and the electrode is electrically connected to the electrical signal processing element.

[0014] In one embodiment, the sensor assembly is a sensor assembly for a filter, wherein one end of the fluid channel is connected to the first accommodating chamber, and the other end is connected to the unfiltered side space of the filter.

[0015] On the other hand, the present application also provides a filter, the filter comprising: a cover body, provided with an installation cavity; a sensor assembly, arranged in the installation cavity, the sensor assembly comprising a carrier, an electrical signal processing element, a pressure sensor and a protective member; the carrier is arranged in the installation cavity, the carrier is provided with a first accommodating cavity, a second accommodating cavity and a fluid channel, the second accommodating cavity is communicated with a fluid source, and the two ends of the fluid channel are respectively communicated with the first accommodating cavity and the second accommodating cavity; the electrical signal processing element is arranged on the carrier; the pressure sensor is arranged in the first accommodating cavity, the pressure sensor is arranged in the first accommodating cavity, and the pressure sensor is arranged in the second accommodating cavity. The force sensor is electrically connected to the electrical signal processing element, and the pressure sensor is provided with a detection port; the protective member is arranged between the detection port and the fluid channel to protect the detection port; the filter element is arranged in the installation cavity and forms a dirty side and a clean side, the filter element is provided with an inner hole, the space between the outer side of the filter element and the cavity wall of the installation cavity is the dirty side, the dirty side and the second accommodating cavity are connected to the space corresponding to the inner hole is the clean side, and the unfiltered fluid in the dirty side enters the clean side after being filtered by the filter element; the seat body is connected to the cover body and closes the installation cavity.

[0016] In one embodiment, the sensor assembly also includes a water level sensor, the base body is provided with a fourth accommodating chamber, the fourth accommodating chamber is located below the filter element, the water level sensor is in the shape of an elongated strip and includes a first end and a second end, the water level sensor is passed through the inner hole, the first end is connected to the carrier, and the second end is located in the fourth accommodating chamber.

[0017] The above-mentioned sensor assembly can filter out larger impurities by setting a protective part between the pressure sensor and the fluid channel, preventing large impurities from clogging the detection port of the pressure sensor and causing the pressure detector to fail, thereby ensuring that the pressure sensor can continuously and stably measure the fluid pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of an exploded view of a filter in one embodiment of the present application.

[0019] Figure 2 for Figure 1 Schematic diagram from another angle.

[0020] Figure 3 Schematic diagram of the structure of a pressure sensor of a sensor assembly in one embodiment of the present application.

[0021] Figure 4 It is a schematic cross-sectional view along one of the planes parallel to the central axis of the filter in one embodiment of the present application.

[0022] Figure 5 for Figure 4 Enlarged schematic diagram of point A in the middle.

[0023] Figure 6 This is a top view of the filter cover in one embodiment of the present application when the first protective cover is not provided.

[0024] Figure 7 for Figure 6 Schematic diagram when no electrical signal processing components are provided.

[0025] Figure 8 This is a bottom view of the protective member and the sealing member of the sensor assembly in one embodiment of the present application.

[0026] Figure 9 for Figure 4 Enlarged schematic diagram of point B in the middle.

[0027] Description of reference numerals:

[0028] 1. Sensor assembly; 2. Filter;

[0029] 11. Carrier; 111. First accommodating cavity; 112. Second accommodating cavity; 113. First protrusion; 1131. First protective cover; 114. Second protrusion; 1141. Second protective cover; 115. First oil passage hole; 116. Second oil passage hole; 117. Fluid channel; 118. Third protrusion; 12. Electrical signal processing element; 13. Pressure sensor; 131. Substrate; 1311. Connecting pin; 132. Protective cover; 133. Sensor; 134. Integrated circuit chip; 135. Detection port; 136. Inner cavity; 137. Sealing member; 14. Protective member; 141. Through hole; 15. Water level sensor; 151. Extension portion; 152. Electrode; 16. Heating assembly; 161. First heat conducting plate; 162. Heater; 163. Second heat conducting plate;

[0030] 21. Cover body; 211. Installation cavity; 2111. Dirty side; 2112. Clean side; 212. Oil inlet pipe; 213. Oil outlet pipe; 22. Filter element; 221. Inner hole; 23. Seat body; 231. Support part. DETAILED DESCRIPTION

[0031] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0032] In the description of this application, it should be understood that if 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", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0033] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0034] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0035] The following uses a diesel filter as an example to illustrate the sensor assembly 1 and the filter 2 provided in the present application. The sensor assembly 1 provided in the present application is configured as a part of the diesel filter.

[0036] refer to Figure 1 and Figure 2 The filter 2 is a diesel filter used to separate water and other impurities in diesel to protect the fuel system. The filter 2 includes a cover 21, a sensor assembly 1, a filter element 22 and a seat 23. For ease of understanding, the filter 2 is Figure 1 and Figure 2 In Figure 1 and Figure 2 In the figure, the cover 21, the sensor assembly 1, the filter element 22 and the base 23 are arranged in sequence from top to bottom.

[0037] Continue to refer Figure 1 and Figure 2 , combined with Figure 4 The cover body 21 is cup-shaped and has a mounting cavity 211 formed therein. The sensor assembly 1 and the filter element 22 are both mounted in the mounting cavity 211. The opening of the cover body 21 is downwardly disposed, and the base body 23 covers the opening and closes the mounting cavity 211.

[0038] The housing 21 is provided with an oil inlet pipe 212 and an oil outlet pipe 213. In this embodiment, both the oil inlet pipe 212 and the oil outlet pipe 213 are located on the top side of the housing 21 and communicate with the oil supply line of the diesel engine's fuel supply system (not shown), thereby connecting the filter 2 in series with the oil circuit of the diesel engine's fuel supply system. During the filtering operation of the filter 2, unfiltered diesel enters the installation cavity 211 of the filter 2 through the oil inlet pipe 212, is filtered by the filter element 22, and then flows out through the oil outlet pipe 213.

[0039] In some embodiments, the seat 23 is located on the bottom side of the cover 21. In an exemplary embodiment, the seat 23 is approximately cylindrical, and the bottom of the filter element 22 is accommodated in the seat 23. The outer circumference of the seat 23 is provided with an annular external thread portion, and the inner side of the bottom of the cover 21 is provided with an annular internal thread portion, so that the seat 23 and the cover 21 can be threadedly connected by screwing.

[0040] The sensor assembly 1 in some embodiments of the present application is described in detail below. Figure 1 and Figure 2 The sensor assembly 1 includes components such as a carrier 11, an electrical signal processing element 12 and a pressure sensor 13.

[0041] In this embodiment, the carrier 11 is provided with a first accommodating cavity 111 and a second accommodating cavity 112, and the first accommodating cavity 111 and the second accommodating cavity 112 are arranged opposite to each other. Figure 1 、 Figure 2 and Figure 4 For example, a first convex column 113 is provided on the top side of the carrier 11. The first convex column 113 protrudes upward from the cover 21, and the top surface of the first convex column 113 is recessed downward, thereby forming the first accommodating cavity 111. Figure 6It can be seen that the pressure sensor 13 and the electrical signal processing element 12 are arranged in the first accommodating cavity 111, and the pressure sensor 13 and the electrical signal processing element 12 form an electrical connection. In some other embodiments, the electrical signal processing element 12 can also be arranged at other locations of the carrier 11. The electrical signal processing element 12 can be a circuit board with an integrated processor to analyze and output electrical signals to the vehicle's control system. A first protective cover 1131 is detachably provided on the top side of the first boss 113. The first protective cover 1131 closes the first accommodating cavity 111 to protect the pressure sensor 13 and prevent the pressure sensor 13 from being damaged by accidental touch. The second accommodating cavity 112 is located on the bottom side of the carrier 11. Similar to the first accommodating cavity 111, the bottom side of the carrier 11 is provided with a second boss 114. The second boss 114 protrudes downward, and the bottom side of the second boss 114 is recessed upward, thereby forming the second accommodating cavity 112. The second accommodating chamber 112 is connected to the oil inlet pipe 212, allowing diesel to enter the second accommodating chamber 112 through the oil inlet pipe 212. A second protective cover 1141 is removably provided on the bottom side of the second boss 114. The second protective cover 1141 seals the second accommodating chamber 112 to prevent diesel leakage. The second accommodating chamber 112 is connected to the installation chamber 211. Subsequently, unfiltered diesel entering the second accommodating chamber 112 through the oil inlet pipe 212 can continue to enter the installation chamber 211. The filter element 22 can filter the diesel entering the installation chamber 211.

[0042] In some other alternative embodiments, the first accommodating cavity 111 and the second accommodating cavity 112 may also be arranged in a left-right relative position or arranged obliquely relative to each other; furthermore, in some other alternative embodiments, the first protrusion 113 protrudes downward, and the second protrusion 114 protrudes upward outside the cover body 21, that is, the second accommodating cavity 112 is arranged above the first accommodating cavity 111. This application does not limit the relative position of the first accommodating cavity 111 and the second accommodating cavity 112.

[0043] refer to Figure 1 The carrier 11 is further provided with a first oil passage hole 115 and a second oil passage hole 116. The top side of the first oil passage hole 115 is connected to the oil inlet pipe 212, and the top side of the second oil passage hole 116 is connected to the oil outlet pipe 213. Figure 4 , although in Figure 4 Although not directly observable, it is important to note that the bottom of the first oil passage hole 115 communicates with the second accommodating chamber 112, while the bottom of the second oil passage hole 116 communicates with the mounting chamber 211. Unfiltered diesel fuel then flows from the first oil passage hole 115 into the second accommodating chamber 112 via the oil inlet pipe 212, then into the mounting chamber 211, where it is filtered by the filter element 22. The filtered diesel fuel then flows through the second oil passage hole 116 into the oil outlet pipe 213 and out of the filter 2.

[0044] In this embodiment, reference Figure 3 and Figure 5 The pressure sensor 13 includes a substrate 131, a protective cover 132, a sensor 133 and an integrated circuit chip 134. Exemplarily, the protective cover 132 is covered on the substrate 131, and the protective cover 132 and the substrate 131 enclose an approximately closed inner cavity 136. The sensor 133 and the integrated circuit chip 134 are both connected to the substrate 131 and fixedly arranged in the inner cavity 136, and the sensor 133 and the integrated circuit chip 134 are electrically connected. When the sensor 133 is subjected to pressure, the sensor 133 undergoes micro-deformation and can send an electrical signal to the integrated circuit chip 134. The substrate 131 is provided with a detection port 135. More specifically, the detection port 135 is a through hole extending along the thickness direction of the substrate 131 and penetrating the substrate 131. It can be understood that the detection port 135 connects the inner cavity 136 and the external space of the pressure sensor 13. Therefore, when unfiltered diesel enters the second accommodating chamber 112 from the first oil passage through the oil inlet pipe 212, the diesel can enter the inner cavity 136 through the detection port 135 outside the pressure sensor 13 and contact the sensor 133, causing the sensor 133 to produce a micro-deformation under the pressure of the diesel, and then send an electrical signal to the integrated circuit chip 134.

[0045] In this embodiment, reference Figure 3 、 Figure 5 and Figure 7 , the integrated circuit chip 134 is electrically connected to the electrical contacts (not shown) on the substrate 131, and the electrical contacts are electrically connected to the electrical signal processing element 12 through the connecting pins 1311. The number of connecting pins 1311 in this embodiment is 5, and this application does not limit the number of connecting pins 1311. In other embodiments, the integrated circuit chip 134 and the electrical signal processing element 12 can also be connected through electrical connectors (such as wires). The integrated circuit chip 134 is electrically connected to the electrical signal processing element 12, so that the fluid pressure value measured by the pressure sensor 13 is transmitted to the electrical signal processing element 12 in the form of an electrical signal, and then the fluid pressure value can be fed back to the control system on the vehicle.

[0046] refer to Figure 4 and Figure 5It should be noted that the carrier 11 is also provided with a fluid channel 117, one end of which is connected to the first accommodating chamber 111 and the other end is connected to the second accommodating chamber 112. In the exemplary embodiment, it is understood that the diesel in the second accommodating chamber 112 can flow through the fluid channel 117 to the first accommodating chamber 111 and into the inner chamber 136 through the detection port 135, and then the pressure sensor 13 can measure the pressure of the diesel. In this embodiment, the detection port 135 is arranged opposite the fluid channel 117, and a seal 137 is provided between the substrate 131 and the bottom wall of the first accommodating chamber 111 to prevent diesel from leaking out of the inner chamber 136 and preventing diesel from contaminating other components in the first accommodating chamber 111. In the exemplary embodiment, the seal 137 is an O-ring. In other embodiments, the seal 137 can also be a ring-shaped light-curing UV adhesive, etc., which is not limited in this application. In some other embodiments, when the sensor assembly 1 described in this embodiment is arranged in a filter 2 of other structures, one end of the fluid channel 117 is connected to the first accommodating chamber 111, and the other end of the fluid channel 117 may not be connected to the second accommodating chamber 112, but directly connected to the fluid source (such as a fuel tank).

[0047] In some embodiments, the sensor assembly 1 further includes a protective member 14. Figure 5 , the protective member 14 is arranged between the detection port 135 and the fluid channel 117 to protect the detection port 135, and corresponds to the area surrounded by the seal. Diesel contains impurities such as moisture, solid particles, microorganisms and chemical pollutants. Among them, solid particles can easily cause the detection port 135 of the pressure sensor 13 to be blocked, making it impossible for the pressure sensor 13 to accurately measure the pressure of the diesel. The protective member 14 is arranged between the detection port 135 and the fluid channel 117. The protective member 14 is added to prevent large particles of impurities in unfiltered diesel from entering the detection port 135, thereby avoiding clogging of the detection port 135. In this embodiment, the protective member 14 is connected to the bottom side of the substrate 131, which helps to keep the protective member 14 stable, thereby improving the barrier effect on large particles of impurities.

[0048] Furthermore, the protective member 14 is cup-shaped and covers the detection port 135. For example, referring to Figure 3 and Figure 5 , the opening of the protective member 14 faces upward, and the top edge of the protective member 14 is connected to the bottom side of the substrate 131. Specifically, the connection between the protective member 14 and the bottom side of the substrate 131 can be bonding or welding, etc., which is not limited in this application. In the direction perpendicular to the thickness of the substrate 131, the cross section of the detection port 135 is circular. In other words, the detection port 135 can be regarded as a circular through hole. Combined Figure 5 and Figure 8As can be seen, the bottom side of the protective member 14 is provided with a through hole 141. It is important to note that the diameter of through hole 141 is smaller than the diameter of the detection port 135. Due to the smaller diameter of through hole 141, larger impurities are blocked outside the protective member 14. Furthermore, because the diameter of through hole 141 is smaller than the diameter of the detection port 135, smaller impurities that can pass through through hole 141 and enter the protective member 14 will not accumulate at the detection port 135, thus preventing the detection port 135 from being clogged. In this embodiment, the number of through holes 141 is three. In other embodiments, the number of through holes 141 can also be set to other numbers, and this application is not limited to this.

[0049] Furthermore, the diameter of the through hole 141 is less than one-third of the diameter of the detection port 135. In this case, the effect of the through hole 141 in blocking impurities in unfiltered diesel can be optimized, and the diesel flowing through the detection port 135 can be ensured to have sufficient flow for detection by the pressure sensor 13, thereby improving the measurement accuracy of the pressure sensor 13.

[0050] In some embodiments, more specifically, the diameter of the through hole 141 is less than 0.3 mm. In this case, the protective member 14 can block most impurities that are likely to cause blockage of the detection port 135 from entering the protective member 14, preventing these larger impurities from causing blockage of the detection port 135.

[0051] In some embodiments, more specifically, the diameter of the detection port 135 is greater than 0.8 mm. In this case, the diameter of the detection port 135 is sufficient to allow sufficient diesel to enter the inner cavity 136 and contact the susceptor 133.

[0052] In some embodiments, the radial cross-section of the fluid channel 117 is circular, and the diameter of the fluid channel 117 is larger than the diameter of the through hole 141. Figure 5 and Figure 8 The fluid channel 117 is a circular channel, and the diameter of the fluid channel 117 is larger than the diameter of the through hole 141. On the one hand, it ensures that a sufficient flow of diesel can flow through the fluid channel 117 to the through hole 141 per unit time, thereby improving the accuracy of the pressure sensor 13 in measuring the diesel pressure. On the other hand, it avoids the fluid channel 117 from having a diameter that is too small and blocking impurities outside the fluid channel 117 in advance, thereby preventing impurities from accumulating at one end of the fluid channel 117 close to the mounting cavity 211 and causing blockage.

[0053] In some embodiments, the sensor assembly 1 further includes a heating assembly 16. Figure 9 The heating assembly 16 is disposed in the second accommodating cavity 112 and includes a first heat conducting plate 161, a heater 162, and a second heat conducting plate 163. Figure 9The first heat conducting plate 161 and the second heat conducting plate 163 are parallel to each other and spaced apart. The heater 162 is disposed between the first heat conducting plate 161 and the second heat conducting plate 163. The heater 162 is electrically connected to the electrical signal processing element 12 via an electrical connector (not shown). The heater 162 is controlled by the electrical signal processing element 12 to generate heat, which is then transferred to the first heat conducting plate 161 and the second heat conducting plate 163, thereby heating the diesel in the second accommodating chamber 112 and facilitating combustion. In this embodiment, the first heat conducting plate 161 and the second heat conducting plate 163 are both aluminum alloy plates, which have excellent thermal conductivity, are lightweight, and are corrosion-resistant. The heater 162 is a PTC (positive temperature coefficient) heater, which has low thermal resistance, high heat exchange efficiency, and is effective in heating the diesel.

[0054] The unfiltered diesel in the second accommodating chamber 112 will flow into the installation chamber 211 for filtration. Figure 1 and Figure 4 The filter element 22 is approximately cylindrical in shape. An inner hole 221 is defined at the center axis of the filter element 22. This inner hole 221 extends axially along the filter element 22, and the bottom of the inner hole 221 is sealed. A third protrusion 118 is provided on the bottom side of the carrier 11, extending into the inner hole 221. The outer circumferential surface of the third protrusion 118 abuts the inner circumferential surface of the inner hole 221, separating the inner hole 221 from the space outside the filter element 22. The filter element 22 divides the mounting cavity 211 into a dirty side 2111 and a clean side 2112. The space occupied by the inner hole 221 is the clean side 2112, while the space between the outer surface of the filter element 22 and the inner surface of the housing 21 is the dirty side 2111. An oil transfer channel (not shown) is formed within the carrier 11. One end of the oil transfer channel is located at the bottom side of the third protrusion 118, and the other end is connected to the second oil passage through hole 116. It can be understood that the unfiltered diesel flows through the oil inlet pipe 212 to the second accommodating chamber 112, then flows to the dirty side 2111, and reaches the clean side 2112 after the impurities are filtered by the filter element 22, and then flows through the oil transfer channel to reach the oil outlet pipe 213, thus completing the entire filtering action.

[0055] In some embodiments, the sensor assembly 1 further includes a water level sensor 15, which includes an extension portion 151 and an electrode 152. The extension portion 151 is in the shape of an elongated strip, one end of which is connected to the carrier 11, and the extension portion 151 extends in a direction away from the first accommodating cavity 111. The electrode 152 is disposed at the end of the extension portion 151 away from the carrier 11, and the electrode 152 is electrically connected to the electrical signal processing element 12. For example, referring to Figure 1 、 Figure 2 and Figure 4The extension portion 151 is arranged vertically, with the upper end of the extension portion 151 connected to the third protrusion 118, and the lower end of the extension portion 151 being farthest from the carrier 11. The electrode 152 is disposed at the lower end of the extension portion 151 and is electrically connected to the electrical signal processing element 12. Specifically, an electrical connector (such as a spring pin) is disposed at the upper end of the extension portion 151 and extends into the first accommodating cavity 111. An electrical wire is disposed within the extension portion 151, with one end connected to the electrical connector and the other end connected to the electrode 152. The water level sensor 15 can measure the water content in the diesel fuel based on the difference in electrical resistance between water and diesel fuel, thereby determining whether the diesel fuel is suitable for normal use.

[0056] Furthermore, the seat 23 is provided with a fourth accommodating cavity 231, which is located below the filter element 22. The water level sensor 15 includes a first end and a second end. The water level sensor 15 is provided in the inner hole 221, with the first end connected to the carrier 11 and the second end located in the fourth accommodating cavity 231. For example, continue to refer to Figure 1 、 Figure 2 and Figure 4 The seat body 23 is in the shape of a pocket, and a support portion 231 is provided on the inner edge of the seat body 23. The support portion 231 is used to connect and fix the bottom of the filter element 22, so that there is a certain distance between the bottom side of the filter element 22 and the bottom of the seat body 23. The seat body 23 forms a fourth accommodating chamber 231, which is located below the filter element 22 to receive impurities such as moisture filtered from the diesel by the filter element 22. In this embodiment, the first end is the upper end of the extension portion 151, and the second end is the lower end of the extension portion 151. The extension portion 151 passes through the inner hole 221 of the filter element 22, the first end is connected to the third protrusion 118, and the second end is located in the fourth accommodating chamber 231. When the filter element 22 filters out moisture from the diesel and water is stored in the seat body 23, the lower end of the water level sensor 15 contacts the water and can measure the resistance value of the water. As can be understood, the electrode 152 disposed at the second end is located in the fourth accommodating chamber 231, thereby being in contact with water to measure the resistance value. Inserting the water level sensor 15 through the inner hole 221 of the filter element 22 and extending into the fourth accommodating chamber 231 simplifies the structure of the sensor assembly 1 and improves the structural compactness of the entire sensor assembly 1.

[0057] One end of the fluid channel 117 in the sensor assembly 1 described in the present application is connected to the first accommodating chamber 111, and the other end is connected to the unfiltered side space (such as the dirty side described in this article). For unfiltered fluid, even if the fluid contains impurities with a large volume, the sensor assembly 1 provided by the present application can also avoid the impurities from causing the detection port of the pressure sensor 13 to be blocked, and can ensure that the pressure sensor 13 can continue to work normally. The sensor assembly 1 provided by the present application has a simple structure and low cost. It can be applied to situations where the impurity content in the fluid to be measured is high or the volume is large, and can work normally even in relatively harsh usage environments. Of course, the sensor assembly 1 provided in this embodiment can also be used for filters other than diesel filters, such as fuel filters, oil filters, and oil-water separators.

[0058] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A sensor assembly, characterized in that: The sensor assembly comprises: The carrier is provided with a first accommodating cavity and a fluid channel, wherein the fluid channel is connected with the first accommodating cavity and the fluid source; an electrical signal processing element, disposed on the carrier; A pressure sensor is disposed in the first accommodating cavity, the pressure sensor is electrically connected to the electrical signal processing element, and the pressure sensor is provided with a detection port; wherein, The sensor assembly further includes a protection member disposed between the detection port and the fluid channel to protect the detection port.

2. The sensor assembly according to claim 1, wherein The protective member is cup-shaped and covers the detection port. The protective member is provided with a circular through hole. The radial cross section of the detection port is circular, and the diameter of the through hole is smaller than the diameter of the detection port.

3. The sensor assembly according to claim 2, wherein: The radial cross section of the fluid channel is circular, and the diameter of the fluid channel is larger than the diameter of the through hole.

4. The sensor assembly according to claim 2 or 3, characterized in that The diameter of the through hole is smaller than one third of the diameter of the detection port.

5. The sensor assembly according to claim 2 or 3, characterized in that The diameter of the through hole is less than 0.3 mm.

6. The sensor assembly according to claim 2 or 3, characterized in that The diameter of the detection port is greater than 0.8 mm.

7. The sensor assembly according to any one of claims 1 to 3, characterized in that The sensor assembly further includes a heating assembly. The sensor assembly is provided with a second accommodating cavity. The second accommodating cavity is arranged opposite to the first accommodating cavity. The heating assembly is arranged in the second accommodating cavity to heat the fluid.

8. The sensor assembly according to claim 7, wherein: The second accommodating chamber is in communication with the fluid source, and the fluid channel is in communication with the first accommodating chamber and the second accommodating chamber.

9. The sensor assembly according to any one of claims 1 to 3, characterized in that: It also includes a water level sensor, which includes an extension portion and an electrode. The extension portion is in the shape of a long strip, and one end of the extension portion is connected to the carrier. The extension portion extends in a direction away from the first accommodating cavity. The electrode is arranged at the end of the extension portion away from the carrier, and the electrode is electrically connected to the electrical signal processing element.

10. The sensor assembly according to any one of claims 1 to 3, characterized in that The sensor assembly is a sensor assembly for a filter, wherein one end of the fluid channel is communicated with the first accommodating chamber, and the other end is communicated with the unfiltered side space of the filter.

11. A filter, characterized in that: The filter includes: The cover body is provided with a mounting cavity; A sensor assembly is disposed in the mounting cavity, comprising a carrier, an electrical signal processing element, a pressure sensor, and a protective member; the carrier is disposed in the mounting cavity, and is provided with a first accommodating cavity, a second accommodating cavity, and a fluid channel, the second accommodating cavity being in communication with a fluid source, and two ends of the fluid channel being in communication with the first accommodating cavity and the second accommodating cavity, respectively; the electrical signal processing element is disposed in the carrier; the pressure sensor is disposed in the first accommodating cavity, the pressure sensor being electrically connected to the electrical signal processing element, and the pressure sensor being provided with a detection port; the protective member is disposed between the detection port and the fluid channel to protect the detection port; a filter element disposed in the mounting cavity and forming a dirty side and a clean side; the filter element is provided with an inner hole; the space between the outer side of the filter element and the cavity wall of the mounting cavity is the dirty side; the space corresponding to the inner hole where the dirty side communicates with the second accommodating cavity is the clean side; unfiltered fluid in the dirty side enters the clean side after being filtered by the filter element; The seat body is connected to the cover body and closes the installation cavity.

12. The filter according to claim 11, characterized in that The sensor assembly also includes a water level sensor. The base body is provided with a fourth accommodating chamber, and the fourth accommodating chamber is located below the filter element. The water level sensor is in the shape of an elongated strip and includes a first end and a second end. The water level sensor is passed through the inner hole, the first end is connected to the carrier, and the second end is located in the fourth accommodating chamber.

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