Pressure sensor and liquid level detection device

Abstract

This application relates to a pressure sensor and a liquid level detection device. The pressure sensor is installed on a three-way connector, which has a first interface, a second interface, and a third interface. The first interface is used to connect to a liquid storage device, and the second interface is used to connect to a pump body. The pressure sensor includes a main body and a detection tube. The main body is connected to the third interface, and a mounting hole is provided at one end of the main body near the third interface. One end of the detection tube is connected to the mounting hole, and the other end extends towards the liquid storage device and enters the liquid storage device through the first interface. The pressure sensor and liquid level detection device provided by this application, by incorporating a detection tube, can more accurately detect the liquid level height of the liquid storage device.

Description

Technical Field

[0001] This application relates to the field of liquid level detection device technology, and in particular to a pressure sensor and a liquid level detection device. Background Technology

[0002] In such structures, the liquid level is typically detected by a pressure sensor to monitor the liquid pressure inside a storage device, such as a tank. To avoid increasing the risk of leaks in the tank, the pressure sensor is usually not installed outside the tank outlet. Instead, it is connected to the tank outlet via a T-junction. Specifically, one port of the T-junction is connected to the tank outlet via a section of intermediate pipe, the other port is connected to the pump via an external pipe, and the pressure sensor is installed at the remaining port. The end of the pressure sensor closest to the T-junction has a detection port, which detects the liquid level in the storage device by measuring the liquid pressure at the T-junction.

[0003] However, in the above scheme, due to the small flow cross-sectional area of ​​the three-way pipe, when the pump body has a large working power, the pump body's suction effect will easily cause large pressure fluctuations or even cavities at the three-way pipe, which will result in the pressure value detected by the detection hole not accurately reflecting the liquid level height of the liquid storage device. Utility Model Content

[0004] Therefore, it is necessary to provide a pressure sensor and a liquid level detection device to more accurately detect the liquid level height of the storage device.

[0005] A pressure sensor is used to be installed on a three-way connector. The three-way connector has a first interface, a second interface, and a third interface. The first interface is used to connect to a liquid storage device, and the second interface is used to connect to a pump body. The pressure sensor includes a main body and a detection tube. The main body is connected to the third interface, and a mounting hole is provided at one end of the main body near the third interface. One end of the detection tube is connected to the mounting hole, and the other end extends toward the liquid storage device and enters the liquid storage device through the first interface.

[0006] In one embodiment, the main body has a connecting section at one end near the tee head, and the connecting section is detachably connected to the third interface; the mounting hole is opened on the side wall of the connecting section along its circumference; or, the mounting hole is opened on the bottom wall of the connecting section along its axial direction.

[0007] In one embodiment, the connecting section includes a threaded connecting section and a milled section connected along its own axial direction. The threaded connecting section is threadedly connected to the third interface. The milled section extends into the tee head, and the mounting hole is opened on the side wall of the milled section along its own axial direction. One end of the detection tube is connected to the mounting hole, and the other end extends along the axial direction of the first interface.

[0008] In one embodiment, the direction from the first interface to the second interface is defined as the first direction, the second direction is perpendicular to the first direction, and the width of the milled section along the second direction is less than the width of the threaded connection section along the second direction.

[0009] In one embodiment, the end face of the threaded connection section near the milled section and the outer walls of the two sides of the milled section along the second direction respectively form a notch.

[0010] In one embodiment, the pressure sensor further includes an adapter with a mounting hole in the bottom wall of the connecting section along its own axial direction. The adapter has a first port and a second port that are connected to each other. The first port is detachably connected to the mounting hole, and the second port is detachably connected to the detection tube.

[0011] In one embodiment, the detection tube includes a first tube and a second tube connected to each other, the first tube and the second tube being perpendicular to each other, and the end of the first tube away from the second tube being detachably connected to a mounting hole, and the end of the second tube away from the first tube extending into a liquid storage device.

[0012] In one embodiment, the connecting segment is threadedly connected to the third interface.

[0013] In one embodiment, the main body has a cavity, a mounting hole connects to the cavity, an elastic diaphragm is installed inside the cavity, a piezoresistor is provided on the elastic diaphragm, and the elastic diaphragm is configured to deform in response to the compression of the liquid.

[0014] A liquid level detection device includes a three-way connector, a placement box, and a pressure sensor as described in any of the above embodiments. The three-way connector has a first interface, a second interface, and a third interface. The first interface is used to connect to a liquid storage device, and the second interface is used to connect to a pump body. The main body of the pressure sensor is connected to the third interface. The placement box is fixedly connected to the end of the pressure sensor away from the third interface. A circuit board is provided inside the placement box, and the pressure sensor is electrically connected to the circuit board.

[0015] Compared to related structures where the pressure sensor detects the liquid pressure inside the tee through a detection hole to reflect the liquid level in the storage device, this application uses a detection tube. One end of the detection tube is connected to the mounting hole, and the other end extends towards the storage device and into the storage device through a first interface. This allows the liquid in the storage device to enter the mounting hole through the detection tube, enabling the pressure sensor to directly detect the liquid pressure inside the storage device, thus providing a more accurate reflection of the liquid level. Furthermore, even if the pump's suction action causes significant pressure fluctuations or even the formation of cavities inside the tee, it will not interfere with the pressure sensor's readings. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 An assembly diagram of the pressure sensor, tee, and housing provided in this application;

[0018] Figure 2 A cross-sectional view of the pressure sensor and tee fitting provided in this application;

[0019] Figure 3 This is a schematic diagram of the structure of the pressure sensor in one embodiment of this application;

[0020] Figure 4 for Figure 3 An exploded schematic diagram of the pressure sensor shown.

[0021] Figure 5 A schematic diagram of the pressure sensor in another embodiment provided in this application;

[0022] Figure 6 This is a schematic diagram of the pressure sensor in another embodiment provided in this application.

[0023] Reference numerals: 10, pressure sensor; 11, main body; 110, cavity; 111, base; 112, cover; 113, connecting section; 1131, threaded connecting section; 1132, milled section; 1133, notch; 12, mounting hole; 13, detection tube; 131, first tube; 132, second tube; 14, elastic diaphragm; 15, adapter; 151, first port; 152, second port; 20, tee; 21, first interface; 22, second interface; 23, third interface; 30, placement box. Detailed Implementation

[0024] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0025] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is 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 can mean that the first feature is 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.

[0028] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0029] Please see Figures 1 to 4 This application provides a pressure sensor 10, which is used to be installed on a three-way connector 20. The three-way connector 20 has a first interface 21, a second interface 22 and a third interface 23. The first interface 21 is used to connect to a liquid storage device, and the second interface 22 is used to connect to a pump body. The pressure sensor 10 includes a main body 11 and a detection tube 13. The main body 11 is connected to the third interface 23, and a mounting hole 12 is provided at one end of the main body 11 near the third interface 23. One end of the detection tube 13 is connected to the mounting hole 12, and the other end extends toward the direction near the liquid storage device and extends into the liquid storage device through the first interface 21.

[0030] It should be noted that the liquid storage device includes, but is not limited to, a tank. The first interface 21 can be directly connected to the liquid storage device or connected via a pipe. Similarly, the second interface 22 can be directly connected to the pump body or connected via a pipe. It is understood that, compared to related structures where the pressure sensor 10 detects the liquid pressure inside the tee through the mounting hole to reflect the liquid level in the storage device, this application uses a detection tube 13. One end of the detection tube 13 is connected to the mounting hole 12, and the other end extends towards the storage device and into the storage device through the first interface 21. This allows the liquid inside the storage device to enter the mounting hole 12 through the detection tube 13, enabling the pressure sensor 10 to directly detect the liquid pressure inside the storage device, thus more accurately reflecting the liquid level. Therefore, even if the pump's suction action causes significant pressure fluctuations or even cavities inside the tee 20, it will not interfere with the detection value of the pressure sensor 10.

[0031] The detection tube 13 is detachably connected to the main body 11. For example, the outer wall of the end of the detection tube 13 near the main body 11 is provided with an external thread, and the inner wall of the mounting hole 12 is provided with an internal thread. The end of the detection tube 13 near the main body 11 is threadedly connected to the mounting hole 12. Furthermore, in order to ensure the sealing of the threaded connection between the detection tube 13 and the mounting hole 12, threadlocker is applied at the contact point between the detection tube 13 and the mounting hole 12.

[0032] In one embodiment, the flow cross-sectional area of ​​the detection tube 13 is equal to the flow cross-sectional area of ​​the mounting hole 12 to avoid throttling of the liquid and causing excessive changes in the liquid flow rate.

[0033] The main body 11 has a cavity 110, and a mounting hole 12 connects to the cavity 110. An elastic diaphragm 14 is installed inside the cavity 110. A piezoresistive resistor is provided on the elastic diaphragm 14, and the elastic diaphragm 14 is configured to deform in response to the pressure of the liquid. Liquid in the storage device flows into the cavity 110 through the detection tube 13 and the mounting hole 12, and pushes the elastic diaphragm 14 to deform. The deformation of the elastic diaphragm 14 causes the piezoresistive resistor attached to the elastic diaphragm 14 to deform. By connecting the elastic diaphragm 14 to a circuit board, the circuit board can further convert the resistance change into a voltage value. The circuit board collects the voltage value of the pressure sensor in real time, and the processor in the circuit board calculates the liquid level depth corresponding to the current pressure based on the current pressure value received by the pressure sensor.

[0034] In one embodiment, the mounting hole 12 has a diameter of 5 mm to prevent liquid from flowing into the cavity 110 and impacting the elastic diaphragm 14.

[0035] The main body 11 includes a base 111 and a cover 112. The cover 112 is threadedly connected to the base 111 and forms a cavity 110 between the cover and the base 111. The cover 112 is used to connect to the placement box 30, specifically it can be threadedly connected to the placement box 30. A circuit board is provided inside the placement box 30, and the pressure sensor is connected to the circuit board.

[0036] The main body 11 has a connecting section 113 at the end opposite to the cover 112. That is, the main body 11 has a connecting section 113 at the end near the tee head 20. The connecting section 113 is detachably connected to the third interface 23, and the mounting hole 12 is opened in the connecting section 113.

[0037] The connecting section 113 is threadedly connected to the third interface 23. The mounting hole 12 can be formed on the side wall of the connecting section 113 along its circumference. Alternatively, the mounting hole 12 can also be formed on the bottom wall of the connecting section 113 along its axial direction.

[0038] In one embodiment, the connecting section 113 includes a threaded connecting section 1131 and a milled section 1132 connected along its own axial direction. The outer peripheral wall of the threaded connecting section 1131 has external threads, and the inner wall of the third interface 23 has internal threads. The threaded connecting section 1131 is threadedly connected to the third interface 23. The milled section 1132 extends into the tee head 20. The mounting hole 12 is formed on the side wall of the milled section 1132 along its own axial direction. One end of the detection tube 13 is connected to the mounting hole 12, and the other end extends along the axial direction of the first interface 21.

[0039] Understandably, the threaded connection section 1131 is used for the threaded connection of the third interface 23, and the milled section 1132 extends into the tee head 20 and provides an installation position for the detection tube 13, facilitating the axial extension of the detection tube 13 along the first interface 21 to extend into the liquid storage device, thereby accurately detecting the liquid level height of the liquid storage device. Furthermore, it is understandable that if the threaded connection section 1131 is used instead of the milled section 1132, and the threaded connection section 1131 is used, then in order to match the external thread on the threaded connection section 1131, the internal thread on the third interface 23 along the axial direction of the third interface 23 needs to be the same length as the threaded connection section 1131, which would greatly increase the machining difficulty of the tee head 20. By setting the connecting section 113 to include a threaded connecting section 1131 and a milled section 1132 connected along its own axial direction, the length of the internal thread on the third interface 23 can be reduced when the length of the connecting section 113 along its own axial direction is the same, which helps to reduce the machining difficulty of the tee head 20.

[0040] Furthermore, the direction from the first interface 21 to the second interface 22 is defined as the first direction, and the second direction is perpendicular to the first direction. The width of the milled section 1132 along the second direction is less than the width of the threaded connection section 1131 along the second direction. It can be understood that the direction from the first interface 21 to the second interface 22 is the first direction, which is the direction of liquid flow. Since the second direction is perpendicular to the first direction, that is, the second direction is perpendicular to the fluid flow direction, by setting the width of the milled section 1132 along the second direction to be less than the width of the threaded connection section 1131 along the second direction, the obstruction effect of the milled section 1132 on the liquid can be reduced, thereby avoiding excessive impact on the liquid flow rate.

[0041] Optionally, in one embodiment, a notch 1133 is formed by the end face of the threaded connection segment 1131 near the milled section 1132 and the outer walls of the milled section 1132 on both sides along the second direction. In this way, fluid can flow evenly through the two notches 1133 from both sides of the milled section 1132 along the width direction. The notches 1133 can be machined on the connection segment 113 by milling a flat surface.

[0042] In another embodiment, such as Figure 5 As shown, the pressure sensor also includes an adapter 15, with a mounting hole 12 formed on the bottom wall of the connecting section along its own axial direction. The adapter 15 has a first port 151 and a second port 152 that are connected. The first port 151 is detachably connected to the mounting hole 12, and the second port 152 is detachably connected to the detection tube 13.

[0043] Specifically, the axis of the first port 151 is perpendicular to the axis of the second port 152. The first port 151 has an external thread, and the mounting hole 12 has an internal thread. The first port 151 extends into the mounting hole 12 and is threadedly connected to the mounting hole 12. The second port 152 has an internal thread, and the detection tube 13 has an external thread. The end of the detection tube 13 near the mounting hole 12 extends into the second port 152 and is threadedly connected to the second port 152.

[0044] In yet another embodiment, such as Figure 6 As shown, the detection tube 13 includes a first tube 131 and a second tube 132 connected to each other. The first tube 131 and the second tube 132 are perpendicular to each other. The end of the first tube 131 away from the second tube 132 is detachably connected to the mounting hole 12, and the end of the second tube 132 away from the first tube 131 extends into the liquid storage device. That is, in this embodiment, an L-shaped extended detection tube 13 is used.

[0045] This application also provides a liquid level detection device, which includes a three-way connector 20, a placement box 30, and a pressure sensor 10 of any of the above embodiments. The three-way connector 20 has a first interface 21, a second interface 22, and a third interface 23. The first interface 21 is used to connect to a liquid storage device, and the second interface 22 is used to connect to a pump body. The main body 11 of the pressure sensor is connected to the third interface 23. The placement box 30 is fixedly connected to the end of the pressure sensor away from the third interface 23. A circuit board is provided inside the placement box 30, and the pressure sensor is connected to the circuit board.

[0046] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0047] The embodiments described above are merely illustrative of several implementation methods of this application, and 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 those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A pressure sensor for mounting to a three-way connector (20), the three-way connector (20) having a first interface (21), a second interface (22) and a third interface (23), the first interface (21) for connecting to a liquid storage device, and the second interface (22) for connecting to a pump body; Its features are, The pressure sensor (10) includes a main body (11) and a detection tube (13). The main body (11) is connected to the third interface (23), and the main body (11) has a mounting hole (12) at one end near the third interface (23). One end of the detection tube (13) is connected to the mounting hole (12), and the other end extends toward the liquid storage device and enters the liquid storage device through the first interface (21).

2. The pressure sensor according to claim 1, characterized in that, The main body (11) has a connecting section (113) at one end near the tee head (20), and the connecting section (113) is detachably connected to the third interface (23); The mounting hole (12) is formed on the side wall of the connecting section (113) along its circumference; or, the mounting hole (12) is formed on the bottom wall of the connecting section (113) along its axial direction.

3. The pressure sensor according to claim 2, characterized in that, The connecting section (113) includes a threaded connecting section (1131) and a milled section (1132) connected along its own axial direction, and the threaded connecting section (1131) is threadedly connected to the third interface (23); The milled section (1132) extends into the tee head (20), the mounting hole (12) is opened on the side wall of the milled section (1132) along its own axial direction, one end of the detection tube (13) is connected to the mounting hole (12), and the other end extends along the axial direction of the first interface (21).

4. The pressure sensor according to claim 3, characterized in that, The direction from the first interface (21) to the second interface (22) is defined as the first direction, and the second direction is perpendicular to the first direction. The width of the milled section (1132) along the second direction is less than the width of the threaded connection section (1131) along the second direction.

5. The pressure sensor according to claim 4, characterized in that, The threaded connection section (1131) near the end face of the milled section (1132) and the two outer walls of the milled section (1132) along the second direction respectively form a notch (1133).

6. The pressure sensor according to claim 2, characterized in that, The pressure sensor also includes an adapter (15), the mounting hole (12) is opened on the bottom wall of the connecting section along its own axis, the adapter (15) has a first port (151) and a second port (152) that are connected to each other, the first port (151) is detachably connected to the mounting hole (12), and the second port (152) is detachably connected to the detection tube (13).

7. The pressure sensor according to claim 2, characterized in that, The detection tube (13) includes a first tube (131) and a second tube (132) connected to each other. The first tube (131) and the second tube (132) are perpendicular to each other. The end of the first tube (131) away from the second tube (132) is detachably connected to the mounting hole (12), and the end of the second tube (132) away from the first tube (131) extends into the liquid storage device.

8. The pressure sensor according to claim 2, characterized in that, The connecting segment (113) is threadedly connected to the third interface (23).

9. The pressure sensor according to claim 1, characterized in that, The main body (11) has a cavity (110), and the mounting hole (12) communicates with the cavity (110). An elastic diaphragm (14) is installed inside the cavity (110). A piezoresistor is provided on the elastic diaphragm (14), and the elastic diaphragm (14) is configured to be able to deform in response to the squeezing of the liquid.

10. A liquid level detection device, characterized in that, The liquid level detection device includes a three-way connector (20), a placement box (30), and a pressure sensor as described in any one of claims 1 to 9. The three-way connector (20) has a first interface (21), a second interface (22), and a third interface (23). The first interface (21) is used to connect to the liquid storage device, and the second interface (22) is used to connect to the pump body. The main body (11) of the pressure sensor is connected to the third interface (23), and the placement box (30) is fixedly connected to the end of the pressure sensor away from the third interface (23). The placement box (30) is provided with a circuit board, and the pressure sensor is connected to the circuit board.

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