Pressure sensor

Abstract

The utility model belongs to the technical field of detection equipment, and discloses a pressure sensor which can detect the pressure of a medium to be detected in a medium container, and under the action of the dead weight of a balancing weight, the extension direction of a medium input hole is always inclined relative to the horizontal plane, namely the balancing weight naturally droops when not subjected to external force, and the pressure of the medium to be detected is detected. Therefore, the medium input hole extends in the vertical direction or in the direction inclined relative to the horizontal plane, the medium to be detected can flow upwards in the medium input hole, and impurities mixed in the medium to be detected can sink under the action of the gravity of the impurities and cannot enter the medium input hole. In addition, due to the arrangement of the hose and the balancing weight, the installation position and angle of the shell of the pressure sensor are not limited, the shell does not need to be kept vertical, and the installation difficulty can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of detection equipment technology, and in particular to pressure sensors. Background Technology

[0002] When pressure sensors detect the pressure of liquid and some gaseous media, they are typically positioned vertically to improve measurement accuracy. This allows the inlet pipe of the measured medium to extend vertically, ensuring the medium flows vertically upwards into the sensor for pressure detection. It also prevents impurities mixed in the measured medium from flowing into the sensor through the inlet pipe, thus avoiding impurity deposition that could affect the sensor's detection accuracy. However, this arrangement limits the sensor's installation location and increases installation difficulty. Utility Model Content

[0003] According to one aspect of the present invention, a pressure sensor is provided to solve the problem that the installation location of pressure sensors in the prior art is restricted and the installation difficulty is increased.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] Pressure sensor, including:

[0006] A housing for connecting a medium container, the inside of which contains the medium to be measured, and a sensor element disposed inside the housing;

[0007] A hose, one end of which is sealed to the housing, and the other end of which extends toward the interior of the medium container, wherein the sensor element is used to measure the pressure of the medium to be measured flowing into the housing through the hose;

[0008] The counterweight is sealed to the end of the hose away from the housing and has a medium inlet communicating with the inner cavity of the hose. The medium inlet is used for the flow of the medium to be measured. Under the weight of the counterweight, the extension direction of the medium inlet is always inclined relative to the horizontal plane.

[0009] As a preferred embodiment of the pressure sensor, the bottom wall of the counterweight is provided with a transverse groove, the extension direction of the transverse groove is perpendicular to the extension direction of the medium input hole, and the transverse groove is connected to the medium input hole for the medium to be measured to flow in.

[0010] As a preferred embodiment of the pressure sensor, multiple transverse grooves are provided, and the multiple transverse grooves intersect each other, with the intersections communicating with the medium input port.

[0011] As a preferred embodiment of the pressure sensor, the counterweight has a through hole, the extension direction of which is perpendicular to the extension direction of the medium input hole and extends through the counterweight. The through hole is connected to the medium input hole and is used for the flow of the medium to be measured.

[0012] As a preferred embodiment of the pressure sensor, multiple through holes are provided, and the multiple through holes intersect each other, with the intersections communicating with the medium input hole.

[0013] As a preferred option for the pressure sensor, the hose is a corrugated pipe.

[0014] As a preferred embodiment of the pressure sensor, the hose is connected to the housing via a connecting pipe, which is fixedly connected between the housing and the hose, and extends toward the interior of the medium container.

[0015] As a preferred embodiment of the pressure sensor, the axis of the medium input hole coincides with the center line of the counterweight.

[0016] As a preferred embodiment of the pressure sensor, the housing has a pressure measuring chamber and an extension hole communicating with the pressure measuring chamber, the sensor element is disposed in the pressure measuring chamber, the extension hole communicates with the inner cavity of the hose, and the housing includes a threaded portion for connecting the medium container, the extension hole being located inside the threaded portion.

[0017] As a preferred embodiment of the pressure sensor, a connecting hole is provided between the extension hole and the inner cavity of the hose, and the connecting hole is connected to the extension hole. The diameter of the connecting hole is smaller than the diameter of the extension hole.

[0018] The beneficial effects of this utility model are:

[0019] This utility model provides a pressure sensor, including a housing, a hose, and a counterweight. The housing is used to connect to a medium container, the inside of which contains the medium to be measured, and a sensor element is disposed inside the housing. One end of the hose is sealed to the housing, and the other end extends toward the inside of the medium container. The sensor element is used to measure the pressure of the medium to be measured flowing into the housing through the hose. The counterweight is sealed to the end of the hose away from the housing and has a medium inlet hole communicating with the inner cavity of the hose. The medium inlet hole is used for the medium to be measured to flow in, so that the medium to be measured in the medium container can flow into the housing through the medium inlet hole and the inner cavity of the hose in sequence, and the pressure of the medium to be measured flowing into the housing through the hose is measured by the sensor element, thereby realizing the pressure detection of the medium to be measured in the medium container. Under the weight of the counterweight, the extension direction of the medium inlet is always inclined relative to the horizontal plane. That is, the counterweight will naturally droop when not subjected to external force, causing the medium inlet to extend vertically or in an inclined direction relative to the horizontal plane. The medium to be measured will flow upwards within the medium inlet, while impurities mixed in the medium will sink under their own gravity and will not enter the medium inlet, thus avoiding the impact of impurity deposition on the detection accuracy of the sensor element. Furthermore, due to the flexible hose and counterweight, the installation position and angle of the pressure sensor housing are unrestricted and do not need to be kept vertical, reducing installation difficulty. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the arrangement structure of the pressure sensor in one embodiment of this utility model;

[0021] Figure 2 This is a schematic diagram of another arrangement structure of the pressure sensor in an embodiment of this utility model;

[0022] Figure 3 This is a schematic diagram of another arrangement structure of the pressure sensor in this utility model embodiment;

[0023] Figure 4 This is a schematic diagram of the structure of a counterweight block in an embodiment of this utility model;

[0024] Figure 5 This is a schematic diagram of another counterweight block in an embodiment of this utility model.

[0025] In the picture:

[0026] 1. Housing; 101. Pressure measuring chamber; 102. Extension hole; 103. Connecting hole; 11. Threaded part; 12. Body part;

[0027] 100. Sensor element; 110. Core; 120. Circuit board; 130. Connecting lines; 140. Sealing ring;

[0028] 2. Hose;

[0029] 3. Counterweight; 31. Medium input hole; 32. Horizontal groove; 33. Through hole;

[0030] 4. Connecting pipe. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0032] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0035] When pressure sensors detect the pressure of liquid and some gaseous media, they are typically positioned vertically to improve measurement accuracy. This allows the inlet pipe of the measured medium to extend vertically, ensuring the medium flows vertically upwards into the sensor for pressure detection. It also prevents impurities mixed in the measured medium from flowing into the sensor through the inlet pipe, thus avoiding impurity deposition that could affect the sensor's detection accuracy. However, this arrangement limits the sensor's installation location and increases installation difficulty.

[0036] In response, this embodiment provides a pressure sensor to solve the problem that the installation location of pressure sensors in the prior art is limited and the installation difficulty is increased. It can be used in the field of detection equipment technology.

[0037] Reference Figures 1-3 The pressure sensor includes a housing 1, a hose 2, and a counterweight 3. The housing 1 is used to connect to a medium container, which contains the medium to be measured. In this embodiment, the medium container can be a pipe or a container, and the medium to be measured can be a liquid medium, such as water or oil, or a gaseous medium, such as natural gas or vehicle exhaust. A sensor element 100 is disposed inside the housing 1. One end of the hose 2 is sealed to the housing 1, and the other end extends toward the inside of the medium container. The sensor element 100 is used to measure the pressure of the medium to be measured flowing into the housing 1 through the hose 2. The counterweight 3 is sealed to the end of the hose 2 away from the housing 1 and has a medium inlet 31 communicating with the inner cavity of the hose 2. The medium inlet 31 is used for the medium to be measured to flow in, so that the medium to be measured in the medium container can flow into the housing 1 through the medium inlet 31 and the inner cavity of the hose 2 in sequence, and the pressure of the medium to be measured flowing into the housing 1 through the sensor element 100 is measured, thereby realizing the pressure detection of the medium to be measured in the medium container. It is understandable that after obtaining the pressure measurement value, the height difference between the counterweight 3 and the sensor element 100, as well as the resistance encountered by the medium to be measured when flowing in the medium inlet 31 and the hose 2, should also be considered, and the measurement value should be corrected to obtain the actual pressure of the medium to be measured in the medium container.

[0038] Continue to refer to Figures 1-3Under the weight of the counterweight 3, the extension direction of the medium input hole 31 is always inclined relative to the horizontal plane. That is, the counterweight 3 will naturally droop when not subjected to external force, so that the medium input hole 31 extends vertically or in an inclined direction relative to the horizontal plane. The medium to be measured will flow upward in the medium input hole 31, and impurities mixed in the medium will sink under their own weight and will not enter the medium input hole 31, thereby avoiding the impact of impurity deposition on the detection accuracy of the sensor element 100. It is understood that the counterweight 3 needs to have a certain weight to make the medium input hole 31 extend vertically or in an inclined direction relative to the horizontal plane. The specific weight of the counterweight 3 is related to factors such as the length of the hose 2, the specific installation angle of the housing 1, and the minimum bending radius of the hose 2. Optionally, in order to further prevent impurities from entering the medium input hole 31, the medium input hole 31 should extend vertically or nearly vertically, preferably vertically.

[0039] Furthermore, due to the arrangement of the hose 2 and the counterweight 3, the installation position and angle of the pressure sensor housing 1 are unrestricted and do not need to be kept vertical, thus reducing installation difficulty. Several specific arrangement structures of pressure sensors are exemplified below.

[0040] like Figure 1 As shown, in the pressure sensor provided in this embodiment, the housing 1 of the pressure sensor is arranged in a vertical direction, and the medium to be measured enters the interior of the housing 1 from bottom to top. In this scheme, the hose 2 and the counterweight 3 both hang down naturally.

[0041] like Figure 2 As shown, in another pressure sensor provided in this embodiment, the housing 1 of the pressure sensor is also arranged in a vertical direction, and the medium to be measured enters the interior of the housing 1 from top to bottom. In this scheme, the hose 2 will bend 180°, the counterweight 3 will hang down naturally, and the medium inlet 31 will extend in a vertical direction, and the medium to be measured will flow vertically upward in the medium inlet 31.

[0042] like Figure 3 As shown, in another pressure sensor provided in this embodiment, the housing 1 of the pressure sensor is arranged in a horizontal direction, and the medium to be measured flows into the interior of the housing 1 in a horizontal direction. In this scheme, the hose 2 will bend at 90°, the counterweight 3 will hang down naturally, and the medium input hole 31 will extend in a vertical direction, and the medium to be measured will flow vertically upward in the medium input hole 31.

[0043] In this embodiment, after installation, the pressure sensor extends into the medium container via the hose 2 and the counterweight 3. If the hose 2 is too long or the inner cavity of the medium container is too small, the bottom of the counterweight 3 may come into contact with the inner wall of the medium container, thus affecting the flow of the medium to be measured into the medium input port 31. To address this issue, this embodiment provides the following two structures.

[0044] One type of structure is as follows Figure 4 As shown, the bottom wall of the counterweight 3 is provided with a transverse groove 32. The extension direction of the transverse groove 32 is perpendicular to the extension direction of the medium input hole 31, and the transverse groove 32 is connected to the medium input hole 31 and is used for the flow of the medium to be tested. If the bottom wall of the counterweight 3 is in contact with the inner wall of the medium container, the medium to be tested can also flow into the medium input hole 31 through the transverse groove 32.

[0045] Optionally, multiple transverse grooves 32 are provided, and the multiple transverse grooves 32 intersect each other and the intersection is connected to the medium inlet hole 31. The extension directions of the multiple transverse grooves 32 are different, so that the medium to be tested can flow into the transverse grooves 32 in different directions and further flow into the medium inlet hole 31.

[0046] Another structure, such as Figure 5 As shown, the counterweight 3 has a through hole 33. The extension direction of the through hole 33 is perpendicular to the extension direction of the medium input hole 31 and passes through the counterweight 3. The through hole 33 is connected to the medium input hole 31 and is used for the flow of the medium to be tested. If the bottom wall of the counterweight 3 is in contact with the inner wall of the medium container, the medium to be tested can also flow from the side wall of the counterweight 3 into the medium input hole 31 through the through hole 33.

[0047] Optionally, multiple through holes 33 are provided, and the multiple through holes 33 intersect each other, with the intersections communicating with the medium input hole 31. In this embodiment, the multiple through holes 33 are located on the same horizontal plane, and the extension directions of the multiple through holes 33 are all different, so that the medium to be measured can flow into the through holes 33 in different directions and further flow into the medium input hole 31. In other embodiments, the multiple through holes 33 can also be arranged at intervals in the vertical direction.

[0048] Continue to refer to Figures 1-3 The hose 2 is a corrugated hose so that the hose 2 can be bent freely and maintain the minimum bending radius without affecting the flow cross section.

[0049] As an alternative, hose 2 can also be a flexible hose that can bend freely and whose flow cross-section does not shrink significantly when bent.

[0050] Continue to refer to Figures 1-3The flexible hose 2 is connected to the housing 1 via a connecting pipe 4. The connecting pipe 4 is fixedly connected between the housing 1 and the flexible hose 2, and extends towards the inside of the medium container. By extending the connecting pipe 4 into the medium container, the flexible hose 2 and the counterweight 3 can be inserted as deeply as possible into the medium container. For a design where the housing 1 is installed on the bottom wall of the medium container, this arrangement also allows the flexible hose 2 and the counterweight 3 to extend upwards, preventing the counterweight 3 from contacting the inner wall of the medium container and affecting the flow of the medium to be measured.

[0051] Continue to refer to Figures 1-3 The axis of the medium input hole 31 coincides with the center line of the counterweight 3. In addition, the material selected for the counterweight 3 has a uniform weight distribution, so that the medium input hole 31 can remain vertical when it hangs naturally.

[0052] Continue to refer to Figures 1-3 The housing 1 has a pressure measuring chamber 101 and an extension hole 102 communicating with the pressure measuring chamber 101. The sensor element 100 is disposed in the pressure measuring chamber 101. The extension hole 102 communicates with the inner cavity of the hose 2. The housing 1 includes a threaded portion 11 for connecting a medium container. The extension hole 102 is located inside the threaded portion 11. It can introduce the medium to be measured from the inner cavity of the hose 2 into the pressure measuring chamber 101 through the extension hole 102. Only one extension hole 102 needs to be provided inside the threaded portion 11. There is no need to install the sensor element 100 or other structures, which can reduce the size of the threaded portion 11.

[0053] Optionally, the housing 1 further includes a body portion 12, to which a threaded portion 11 is connected. In this embodiment, the two are integrally formed, and the pressure measuring chamber 101 is located inside the body portion 12. The size of the body portion 12 can be set to be relatively large. In some embodiments, the body portion 12 can also be connected to other mounting and fixing structures.

[0054] Continue to refer to Figures 1-3 A connecting hole 103 is provided between the extension hole 102 and the inner cavity of the hose 2, and the two are connected through the connecting hole 103. The diameter of the connecting hole 103 is smaller than the diameter of the extension hole 102. This arrangement serves two purposes: firstly, the connecting hole 103 can provide a certain damping for the medium to be measured, so as to avoid the pressure fluctuation of the medium to be measured in the medium container from affecting the pressure detection of the sensor element 100; secondly, it can also block impurities, so as to further prevent impurities from entering the extension hole 102 and the pressure measuring chamber 101.

[0055] Continue to refer to Figures 1-3The sensor element 100 includes a core 110, a circuit board 120, and connecting lines 130. The core 110 is used to obtain pressure signals. The circuit board 120 is electrically connected to both the core 110 and the connecting lines 130, and is used to convert the pressure signals into electrical signals. The connecting lines 130 are used to connect to external devices, thereby storing or displaying the detected pressure values ​​through the external devices. Specifically, the core 110 can be a ceramic capacitive pressure core or a resistance strain gauge. The specific structure and principle of the core 110 and the circuit board 120 can refer to existing pressure sensors, such as piezoresistive pressure sensors and ceramic pressure sensors. These structures are already relatively mature technologies and will not be elaborated further.

[0056] Optionally, a sealing ring 140 is provided between the core 110 and the cavity wall of the pressure measuring chamber 101 to seal the connection between the two and prevent leakage of the measured medium.

[0057] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A pressure sensor, characterized in that, include: A housing (1) is used to connect a medium container, the medium container containing the medium to be measured, and a sensor element (100) is disposed inside the housing (1). The hose (2) is sealed at one end to the housing (1) and extends toward the inside of the medium container at the other end. The sensor element (100) is used to measure the pressure of the medium to be measured flowing into the housing (1) through the hose (2). The counterweight (3) is sealed to the end of the hose (2) away from the housing (1) and has a medium inlet (31) communicating with the inner cavity of the hose (2). The medium inlet (31) is used for the flow of the medium to be measured. Under the weight of the counterweight (3), the extension direction of the medium inlet (31) is always inclined relative to the horizontal plane.

2. The pressure sensor according to claim 1, characterized in that, The bottom wall of the counterweight (3) is provided with a transverse groove (32), the extension direction of the transverse groove (32) is perpendicular to the extension direction of the medium input hole (31), and the transverse groove (32) is connected to the medium input hole (31) and is used for the flow of the medium to be tested.

3. The pressure sensor according to claim 2, characterized in that, Multiple transverse grooves (32) are provided, and the multiple transverse grooves (32) intersect each other, and the intersection is connected to the medium input hole (31).

4. The pressure sensor according to claim 1, characterized in that, The counterweight (3) has a through hole (33), the extension direction of which is perpendicular to the extension direction of the medium input hole (31) and passes through the counterweight (3). The through hole (33) is connected to the medium input hole (31) and is used for the flow of the medium to be measured.

5. The pressure sensor according to claim 4, characterized in that, Multiple through holes (33) are provided, and the multiple through holes (33) intersect each other, and the intersection is connected to the medium input hole (31).

6. The pressure sensor according to claim 1, characterized in that, The hose (2) is a corrugated pipe.

7. The pressure sensor according to any one of claims 1-6, characterized in that, The hose (2) is connected to the housing (1) via a connecting pipe (4). The connecting pipe (4) is fixedly connected between the housing (1) and the hose (2), and extends toward the interior of the medium container.

8. The pressure sensor according to any one of claims 1-6, characterized in that, The axis of the medium input hole (31) coincides with the center line of the counterweight (3).

9. The pressure sensor according to any one of claims 1-6, characterized in that, The housing (1) has a pressure measuring chamber (101) and an extension hole (102) communicating with the pressure measuring chamber (101). The sensor element (100) is disposed in the pressure measuring chamber (101). The extension hole (102) communicates with the inner cavity of the hose (2). The housing (1) includes a threaded portion (11) for connecting the medium container. The extension hole (102) is located inside the threaded portion (11).

10. The pressure sensor according to claim 9, characterized in that, A connecting hole (103) is provided between the extension hole (102) and the inner cavity of the hose (2), and the two are connected through the connecting hole (103). The diameter of the connecting hole (103) is smaller than the diameter of the extension hole (102).

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