Gas pressure sensor

Abstract

The utility model discloses a fuel gas pressure sensor, which comprises a shell seat, a shell cover, a driving assembly and a detection assembly, and is characterized in that the driving assembly comprises a driving diaphragm arranged between the shell seat and the shell cover in a sealing manner, a push rod connected with the driving diaphragm and a spring structure arranged between the push rod and a bottom shell; the detection assembly comprises a mounting groove formed in the bottom of the shell seat, a detection circuit board arranged in the mounting groove, a magnetic sensor arranged on the detection circuit board and a magnetic part arranged on the push rod, and under the condition that the gas pressure exceeds a set range, the driving diaphragm can drive the push rod to move downwards under the action of pressure difference, so that the gas pressure can be detected. The magnetic detection mode has the advantages of non-contact detection, high reliability, environmental interference resistance, high precision, high sensitivity and the like, the structure is simple and compact, and the use performance and quality of products can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure sensors, and particularly relates to a gas pressure sensor. Background Art

[0002] In daily life, gas water heaters or wall-mounted boilers often display a class of fault codes due to excessive gas pressure, accidental flameout, inability to burn normally, etc. Since there is no sensor for detecting gas pressure inside the gas water heater, users cannot find out the specific reasons for such faults. Therefore, by installing a pressure sensor on the gas water heater, it can ensure the safety of users' gas use, help families or enterprises manage their gas use, prevent accidents and large bills, and ensure the normal and safe gas use of users. For example, Chinese patent document CN108663156A discloses a pressure sensor for a gas water heater, which includes a housing, a flexible diaphragm, a movable member, a micro switch and a pressure controller. The movable member is arranged on the side of the flexible diaphragm facing away from the inlet end and displaces according to the deformation of the flexible diaphragm. A contact point facing the movable member is arranged on the side of the micro switch facing the flexible diaphragm. The movable member drives the micro switch to act under the drive of the flexible diaphragm. From the structure of the above pressure sensor, it can be seen that there are still the following problems: This kind of micro switch is triggered by the movable member pressing its contact point, and it is difficult to control the pressure exerted by the flexible diaphragm driving the movable member on the contact point of the micro switch. If the pressure exerted by the movable member on the contact point position is too large, it is easy to cause fatigue damage to the contact point of the micro switch, shorten the service life of the micro switch, and affect the use performance of the product. Summary of the Utility Model

[0003] Therefore, the technical problem to be solved by the utility model is to overcome the problem that the detection method of the pressure sensor in the prior art, which uses the cooperation of a micro switch and a movable member in contact, is easy to cause fatigue damage to the contact point of the micro switch, shorten the service life, and affect the use performance of the product.

[0004] To solve the above technical problem, the utility model provides a gas pressure sensor, including:

[0005] A housing base with a receiving cavity;

[0006] A housing cover installed on the housing base, which includes a threaded joint and a pressure hole provided in the threaded joint and communicating with the receiving cavity;

[0007] A driving assembly movably arranged in the receiving cavity, including a driving diaphragm hermetically arranged between the housing base and the housing cover, a push rod connected to the driving diaphragm, and a spring structure arranged between the push rod and the bottom case;

[0008] The detection component includes an installation groove provided at the bottom of the housing base, a detection circuit board provided in the installation groove, a magnetic inductor provided on the detection circuit board, and a magnetic member provided on the push rod; the push rod drives the magnetic member to move towards or away from the magnetic inductor, and when the magnetic inductor detects the magnetic member, it is triggered and outputs a signal.

[0009] As a preferred solution, the housing base includes a guide post extending in the moving direction of the push rod in the accommodation cavity, and a guide groove extending in the same direction as the guide post in the guide post, and one end of the push rod is slidably connected in the guide groove.

[0010] As a preferred solution, the accommodation cavity is a circular inner cavity, the guide post is provided at the central position of the accommodation cavity, the closed end of the guide post protrudes towards the bottom of the housing base, the installation groove is provided outside the guide post, and the magnetic member is provided at one end of the push rod.

[0011] As a preferred solution, an assembly groove is provided at one end of the push rod, the magnetic member is a magnet block installed in the assembly groove, a retaining buckle for preventing the magnet block from escaping from the assembly groove is provided at the opening of the assembly groove, and at least one strip window for exposing a part of the magnet block is provided on the side wall of the push rod.

[0012] As a preferred solution, the magnetic member is a magnet ring sleeved on one end of the push rod.

[0013] As a preferred solution, the detection circuit board is connected with a wire harness plug extending outside the installation groove, and the installation groove is filled with a potting glue structure that seals and covers the detection circuit board and the magnetic inductor.

[0014] As a preferred solution, the magnetic inductor is a reed switch or a Hall sensor connected to the detection circuit board.

[0015] As a preferred solution, the driving diaphragm seals and divides the accommodation cavity into an upper pressure cavity and a lower pressure cavity, the upper pressure cavity is communicated with the pressure hole, the push rod and the spring structure are connected and arranged in the lower pressure cavity, and the spring structure applies a force to the push rod to drive the magnetic member to move away from the magnetic inductor.

[0016] As a preferred solution, a circular plate that fits and contacts the driving diaphragm is provided at the other end of the push rod, and the cross-sectional shape of the connection between the push rod and the circular plate is T-shaped.

[0017] As a preferred solution, a first annular protrusion is provided on the circular plate in a concentric manner, a second annular protrusion opposite to the first annular protrusion is provided at the bottom of the accommodation cavity, and both ends of the spring structure are respectively positioned and connected to the first annular protrusion and the second annular protrusion.

[0018] The technical solution of the present utility model has the following advantages compared with the prior art:

[0019] 1. In the gas pressure sensor provided by the present utility model, this gas pressure sensor can be quickly installed on the pipeline interface of the water heater through a threaded joint. A connected detection circuit board and a magnetic inductor are provided in the installation groove at the bottom of the housing base, and a magnetic part for triggering the magnetic inductor to turn on or off is provided on the push rod. When the gas pressure exceeds the set range, the driving diaphragm will drive the push rod to move downward under the action of the pressure difference, so that the push rod drives the magnetic part to approach the magnetic inductor. At this time, the magnetic inductor detects the magnetic part and is triggered to output a signal. This output signal is sent to the gas controller through the detection circuit board. The gas controller controls the startup, shutdown of the water heater and issues a fault command according to the gas pressure situation. Users can take targeted actions according to the command, reducing the number of repair requests and improving the user experience. The gas pressure sensor adopting this technical solution realizes the purpose of detecting gas pressure through the magnetic detection method of the cooperation between the magnetic inductor and the magnetic part, and has the characteristics of non-contact detection, high reliability, resistance to environmental interference, high precision, high sensitivity, etc. Therefore, compared with the detection method of the traditional micro switch, the structure is simple and compact, which is beneficial to improving the use performance and quality of the product.

[0020] 2. In the gas pressure sensor provided by the present utility model, one end of the push rod is slidably connected to the guiding groove of the guiding column. The guiding groove plays a guiding role in the movement of the push rod to prevent the push rod from shifting during movement. According to the installation groove, it is arranged outside the guiding column, that is, the detection circuit board and the magnetic inductor are arranged outside the guiding column, and the magnetic part is arranged at one end of the push rod. With this structural arrangement, the driving diaphragm drives the push rod to move according to the gas pressure change, and then the push rod drives the magnetic part to move along the guiding groove towards or away from the magnetic inductor, which helps the magnetic inductor to detect the magnetic field change of the magnetic part, thereby realizing the purpose of detecting gas pressure.

[0021] 3. In the gas pressure sensor provided by the present utility model, a potting glue structure that seals and covers the detection circuit board and the magnetic inductor is filled in the installation groove. The advantage of this design is that this potting glue structure has the characteristics of corrosion resistance, dielectric properties, strong environmental adaptability, strong adhesion, good sealing performance, etc., realizes the sealing and fixing of the detection circuit board and the magnetic inductor, ensures the normal operation of electronic components, extends the service life, and effectively improves the stability, reliability and safety of the installation of the detection circuit board and the magnetic inductor.

[0022] 4. In the gas pressure sensor provided by the present utility model, the magnetic inductor can preferably be a Hall sensor. When the Hall sensor detects the magnetic part, it sends a signal, and this detection signal can be a voltage signal value that gradually increases or decreases with the change of the magnetic field. Then, this signal change is sent to the gas controller through the detection circuit board. The gas controller receives the pressure signal sent by the Hall sensor and controls the operation of the gas water heater to ensure that the gas water heater operates in a normal gas pressure environment. Obviously, this kind of magnetic inductor can also adopt the way of a reed switch, and at the same time, it can achieve the purpose of detecting gas pressure.

[0023] 5. In the gas pressure sensor provided by the present utility model, a circular plate that fits and contacts the driving diaphragm is provided at the other end of the push rod. By providing a first annular protrusion on the circular plate and a second annular protrusion opposite to the first annular protrusion at the bottom of the accommodation cavity, the two ends of the spring structure are respectively positioned and connected to the first annular protrusion and the second annular protrusion. Such an installation design plays a role in positioning and installing the spring structure in the accommodation cavity to prevent the spring structure from shifting and shaking during the process of force deformation, and to ensure the stability and reliability of the installation of the spring structure. Brief Description of the Drawings

[0024] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art.

[0025] Figure 1 It is a three-dimensional structure schematic diagram of the gas pressure sensor of the present utility model;

[0026] Figure 2 It is a cross-sectional structure schematic diagram of the gas pressure sensor of the present utility model;

[0027] Figure 3 It is a structure schematic diagram of the push rod of the present utility model.

[0028] Description of the reference numerals: 1, housing base; 11, accommodation cavity; 12, guide post; 13, guide groove; 14, second annular protrusion; 2, housing cover; 21, threaded joint; 22, pressure hole; 3, driving diaphragm; 4, push rod; 41, assembly groove; 42, anti-back-off buckle; 43, circular plate; 44, first annular protrusion; 45, strip window; 5, spring structure; 6, installation groove; 7, detection circuit board; 71, wire harness plug; 8, magnetic inductor; 9, magnetic part. Specific Embodiments

[0029] The technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0030] In the description of the present utility model, it should be noted that the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0031] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0032] Embodiment

[0033] The following specifically describes this embodiment with reference to the accompanying drawings:

[0034] This embodiment provides a Figures 1-3 gas pressure sensor as shown, which includes a housing base 1, a housing cover 2, a driving component, and a detecting component. Among them, the housing base 1 has a receiving cavity 11; the housing cover 2 is installed on the housing base 1, and it includes a threaded joint 21 and a pressure hole 22 provided on the threaded joint 21 and communicating with the receiving cavity 11. This gas pressure sensor can be installed and connected to a gas pipeline through a threaded structure, and the installation and connection are convenient. The driving component is movably arranged in the receiving cavity 11, and it includes a driving diaphragm 3 hermetically arranged between the housing base 1 and the housing cover 2, a push rod 4 connected to the driving diaphragm 3, and a spring structure 5 arranged between the push rod 4 and the bottom shell; the detecting component includes an installation groove 6 provided at the bottom of the housing base 1, a detecting circuit board 7 arranged in the installation groove 6, a magnetic inductor 8 arranged on the detecting circuit board 7, and a magnetic member 9 arranged on the push rod 4; the push rod 4 drives the magnetic member 9 to move towards or away from one side of the magnetic inductor 8, and when the magnetic inductor 8 detects the magnetic member 9, it is triggered and outputs a signal. The working mode of the gas pressure sensor is described below: When the gas pressure received by the driving diaphragm 3 is greater than the spring force of the spring structure 5, the push rod 4 is driven to move towards the bottom of the housing base 1, that is, the push rod 4 drives the magnetic member 9 to move towards one side close to the magnetic inductor 8, thereby triggering the magnetic inductor 8 to turn on.

[0035] The above-described embodiments are the core technical solutions of this embodiment. This gas pressure sensor can be quickly installed on the pipeline interface of the water heater through the threaded joint 21. A connected detection circuit board 7 and a magnetic inductor 8 are provided in the installation groove 6 at the bottom of the housing base 1, and a magnetic member 9 for triggering the magnetic inductor 8 to turn on or off is provided on the push rod 4. When the gas pressure exceeds the set range, the driving diaphragm 3 will drive the push rod 4 to move downward under the action of the pressure difference, so that the push rod 4 drives the magnetic member 9 to approach the magnetic inductor 8. At this time, the magnetic inductor 8 detects the magnetic member 9 and is triggered to output a signal. This output signal is sent to the gas controller through the detection circuit board 7. The gas controller controls the startup, shutdown of the water heater and issues a fault command according to the gas pressure situation. The user can take targeted actions according to the command, reducing the number of repair requests and improving the user experience. The gas pressure sensor adopting this technical solution realizes the purpose of detecting gas pressure through the magnetic detection method of the cooperation between the magnetic inductor 8 and the magnetic member 9, and has the characteristics of non-contact detection, high reliability, resistance to environmental interference, high precision, high sensitivity, etc. Therefore, compared with the traditional microswitch detection method, the structure is simple and compact, which is beneficial to improving the use performance and quality of the product.

[0036] Further preferably, as Figure 2 shown, the housing base 1 includes a guide post 12 extending in the moving direction of the push rod 4 in the accommodation cavity 11, and a guide groove 13 extending in the same direction as the guide post 12 in the guide post 12. One end of the push rod 4 is slidably connected to the guide groove 13. Specifically, the accommodation cavity 11 is a circular inner cavity, the guide post 12 is provided at the central position of the accommodation cavity 11, the closed end of the guide post 12 protrudes towards the bottom of the housing base 1, and its open end faces the push rod 4. The guide groove 13 guides the movement of the push rod 4 to prevent the push rod 4 from shifting during movement. According to the installation groove 6, it is arranged outside the guide post 12, that is, the detection circuit board 7 and the magnetic inductor 8 are arranged outside the guide post 12, and the magnetic member 9 is arranged at one end of the push rod 4. With this structural arrangement, the driving diaphragm 3 drives the push rod 4 to move according to the gas pressure change, so that the push rod 4 drives the magnetic member 9 to move along the guide groove 13 towards or away from the magnetic inductor 8, which helps the magnetic inductor 8 to detect the magnetic field change of the magnetic member 9, thus achieving the purpose of detecting gas pressure.

[0037] The following will Figures 1-3 make a detailed description of the specific setting method of the detection component:

[0038] An assembly groove 41 is provided in one end of the push rod 4, and the magnetic member 9 is a magnet block installed in the assembly groove 41. A stop buckle 42 is provided at the opening of the assembly groove 41 to prevent the magnet block from escaping from the assembly groove 41, and at least one strip window 45 exposing a part of the magnet block is provided on the side wall of the push rod 4. The magnetic force of the magnet block can be better detected by the magnetic sensor 8 through the strip window 45, thereby achieving the installation and fixation between the push rod 4 and the magnet block; or, the magnetic member 9 is a magnet ring sleeved on one end of the push rod 4, that is, an annular groove connecting the magnet ring is provided on the outer wall of one end of the push rod 4, and the magnetic member 9 can cooperate with the push rod in any of the above two ways, and can be detected by the magnetic sensor.

[0039] It is further preferred that the detection circuit board 7 is connected to a wiring harness plug 71 extending out of the installation slot 6, and the installation slot 6 is filled with a potting glue structure that seals and covers the detection circuit board 7 and the magnetic sensor 8. The advantage of such a design is that the potting glue structure has the characteristics of corrosion resistance, dielectric properties, strong environmental adaptability, strong adhesion, good sealing, etc., which can well seal and fix the detection circuit board 7 and the magnetic sensor 8, ensure the normal operation of electronic components, extend the service life, and effectively improve the stability, reliability and safety of the installation of the detection circuit board 7 and the magnetic sensor 8. In this embodiment, the magnetic sensor 8 can be preferably a Hall sensor, and the Hall sensor detects the magnetic part and sends a signal to achieve the purpose of gas pressure detection. The detection signal can be a voltage signal value that gradually increases or decreases with the change of the magnetic field, and then the detection circuit board 7 sends this signal change to the gas controller, and the gas controller receives the pressure signal sent by the Hall sensor and controls the operation of the gas water heater to ensure that the gas water heater works in a normal gas pressure environment.

[0040] As a replacement for the magnetic sensor 8, the magnetic sensor 8 is a reed switch connected to the detection circuit board 7. This reed switch is turned on under the action of a magnetic field of sufficient strength, and will automatically disconnect when the magnetic field strength weakens. Therefore, when the magnetic member 9 is detected by the reed switch, a signal is output, thereby achieving the purpose of detecting the gas pressure. This reed switch also has the characteristics of small size, light weight, and strong resistance to external interference. Those skilled in the art can make a choice of the specific setting method of the magnetic sensor 8 according to the above description, and other equivalent implementations will not be described one by one here.

[0041] Combination Figures 2-3As shown, the driving diaphragm 3 seals and divides the accommodating cavity 11 into an upper pressure cavity and a lower pressure cavity. The upper pressure cavity is communicated with the pressure hole 22. The push rod 4 and the spring structure 5 are arranged in the lower pressure cavity. The spring structure 5 applies a force to the push rod 4 to drive the magnetic member 9 to move away from the magnetic inductor 8. With this structural arrangement, since the pressure in the upper pressure cavity comes from the gas pressure, when the pressure in the upper pressure cavity increases to be greater than the force of the spring structure 5, the driving module drives the push rod 4 to move downward under the action of the pressure in the upper pressure cavity, and drives the magnetic member 9 to move closer to the magnetic inductor 8, finally triggering the magnetic inductor to turn on and output a signal; conversely, when the gas pressure returns to normal, the driving diaphragm 3 and the push rod 4 will move upward to reset under the action of the spring structure 5, and drive the magnetic member 9 to move away from the magnetic inductor 8.

[0042] Further preferably, the other end of the push rod 4 is provided with a circular plate 43 that is in fitting contact with the driving diaphragm 3. The cross-sectional shape of the connection between the push rod 4 and the circular plate 43 is T-shaped. Among them, the circular plate 43 is provided with a first annular protrusion 44 arranged concentrically. The bottom of the accommodating cavity 11 is provided with a second annular protrusion 14 opposite to the first annular protrusion 44. The two ends of the spring structure 5 are respectively positioned and connected to the first annular protrusion 44 and the second annular protrusion 14. Such an installation design plays a role in positioning and installing the spring structure 5 in the accommodating cavity 11 to prevent the spring structure 5 from shifting and shaking during the process of force deformation, and ensure the stability and reliability of the installation of the spring structure.

[0043] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A gas pressure sensor, characterized in that, include: A housing seat (1) having a receiving cavity (11); A shell cover (2) is mounted on the shell base (1), and comprises a threaded joint (21) and a pressure hole (22) disposed on the threaded joint (21) and connected to the accommodating chamber (11); A drive assembly is movably arranged in the accommodating cavity (11), comprising a drive diaphragm (3) sealed between the housing seat (1) and the housing cover (2), a push rod (4) connected to the drive diaphragm (3), and a spring structure (5) arranged between the push rod (4) and the bottom housing; The detection component comprises a mounting groove (6) arranged at the bottom of a housing (1), a detection circuit board (7) arranged in the mounting groove (6), a magnetic sensor (8) arranged on the detection circuit board (7), and a magnetic member (9) arranged on the push rod (4); the push rod (4) drives the magnetic member (9) to move toward or away from the magnetic sensor (8), and the magnetic sensor (8) is triggered and outputs a signal when detecting the magnetic member (9).

2. The gas pressure sensor according to claim 1, characterized in that: The housing seat (1) comprises a guide column (12) extending in the direction of movement of the push rod (4) and arranged in the accommodating cavity (11), and a guide groove (13) extending in the same direction as the guide column (12) and arranged in the guide column (12), and one end of the push rod (4) is slidably connected to the guide groove (13).

3. The gas pressure sensor according to claim 2, characterized in that: The accommodating cavity (11) is a circular inner cavity, the guide column (12) is arranged at the center position of the accommodating cavity (11), the closed end of the guide column (12) protrudes toward the bottom of the shell seat (1), the mounting groove (6) is arranged on the outside of the guide column (12), and the magnetic member (9) is arranged at one end of the push rod (4).

4. A gas pressure sensor according to claim 1, wherein: An assembly groove (41) is provided at one end of the push rod (4); the magnetic member (9) is a magnet block installed in the assembly groove (41); a stop buckle (42) is provided at the opening of the assembly groove (41) to prevent the magnet block from escaping from the assembly groove (41); and at least one strip-shaped window (45) is provided on the side wall of the push rod (4) to expose a portion of the magnet block.

5. A gas pressure sensor according to claim 1, characterized in that: The magnetic member (9) is a magnet ring sleeved on one end of the push rod (4).

6. A gas pressure sensor according to claim 4 or 5, characterized in that: The detection circuit board (7) is connected to a wiring harness plug (71) extending out of the installation slot (6), and the installation slot (6) is filled with a potting glue structure that seals and covers the detection circuit board (7) and the magnetic sensor (8).

7. The gas pressure sensor according to claim 6, wherein: The magnetic sensor (8) is a reed switch or a Hall sensor connected to the detection circuit board (7).

8. A gas pressure sensor according to claim 7, characterized in that: The driving diaphragm (3) seals and separates the accommodating chamber (11) into an upper pressure chamber and a lower pressure chamber, the upper pressure chamber is connected to the pressure hole (22), the push rod (4) and the spring structure (5) are connected and arranged in the lower pressure chamber, and the spring structure (5) exerts a force on the push rod (4) to drive the magnetic part (9) to move to a side away from the magnetic sensor (8).

9. A gas pressure sensor according to claim 8, characterized in that: The other end of the push rod (4) is provided with a circular plate (43) which is in close contact with the driving diaphragm (3); the cross-sectional shape of the push rod (4) connected to the circular plate (43) is T-shaped.

10. A gas pressure sensor according to claim 9, characterized in that: A first annular protrusion (44) is provided on the circular plate (43) in a concentric manner. A second annular protrusion (14) opposite to the first annular protrusion (44) is provided at the bottom of the accommodation cavity (11). Two ends of the spring structure (5) are respectively positioned and connected to the first annular protrusion (44) and the second annular protrusion (14).

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