Pressure transmitter and electrical device

Abstract

The application relates to the technical field of pressure detection, in particular to a pressure transmitter and an electrical equipment. A pressure transmitter is applied to an electrical equipment and used for detecting the pressure of a medium. The electrical equipment is provided with an external component. The pressure transmitter comprises a shell, sealing glue, a pressure sensing component and a pressure-resistant piece. The shell is formed with an accommodating cavity in communication with the external component, and the accommodating cavity has an opening in a first direction. The sealing glue is used for plugging the opening. The pressure sensing component is arranged in the accommodating cavity and limited by the shell, and the pressure sensing component has a deformation part. The pressure-resistant piece is arranged in the accommodating cavity and limited by the shell. The pressure-resistant piece divides the accommodating cavity into a first cavity in communication with the external component and a second cavity in communication with the opening. The first cavity is used for accommodating the pressure sensing component, the second cavity is used for accommodating the sealing glue, and the pressure-resistant piece is arranged in a spaced mode with the deformation part. The application divides the accommodating cavity into the first cavity and the second cavity by using the pressure-resistant piece, so that the accuracy of pressure measurement can be improved.

Description

Technical Field

[0001] This application relates to the field of pressure detection technology, and in particular to a pressure transmitter and electrical equipment. Background Technology

[0002] In the field of industrial process control, pressure transmitters are used to detect the pressure of gases, liquids or steam and convert it into standard electrical signals for transmission and control.

[0003] In existing technologies, pressure transmitters typically use a deformable element (such as a ceramic body) to sense pressure. This element deforms under pressure, and the deformation is converted into an electrical signal by a connected sensor (such as a piezoresistive chip or capacitive plate) to achieve pressure detection. To protect the internal sensitive element, enhance structural stability, and provide environmental isolation, the non-pressure side of the deformable element is usually filled with sealant. However, after the sealant hardens, it may create additional pressure on the non-pressure side, i.e., back pressure, affecting the normal deformation process of the deformable element. This can cause a deviation in the measurement signal, resulting in pressure drift, which affects the detection accuracy and long-term stability of the pressure transmitter. Utility Model Content

[0004] Therefore, it is necessary to provide a pressure transmitter that can solve the above problems.

[0005] To solve the above-mentioned technical problems, this application provides the following technical solution:

[0006] A pressure transmitter, used in electrical equipment for detecting the pressure of a medium, the electrical equipment having external components, the pressure transmitter comprising:

[0007] The housing has a receiving cavity communicating with external components, the receiving cavity having an opening facing a first direction;

[0008] Sealant, used to seal the opening;

[0009] A pressure sensing component is disposed in the receiving cavity and confined within the housing, the pressure sensing component having a deformable portion for deforming in response to external component pressure;

[0010] A pressure-resistant component is disposed in the receiving cavity and confined within the housing. The pressure-resistant component divides the receiving cavity into a first cavity communicating with an external component and a second cavity communicating with the opening. The first cavity is used to accommodate the pressure sensing component, and the second cavity is used to accommodate the sealant. The pressure-resistant component is spaced apart from the deformable portion.

[0011] It is understood that this application uses a pressure-resistant component to divide the receiving cavity into a first cavity and a second cavity, and places the pressure sensor and sealant in the first cavity and the second cavity respectively. In this way, the pressure-resistant component serves to separate the sealant from the pressure sensor, so that the sealant will not affect the deformation of the pressure sensor after curing, thereby improving the detection accuracy and operational stability of the pressure transmitter.

[0012] In one embodiment, the pressure transmitter further includes a wire assembly, the pressure sensing assembly has a wire connection portion, the pressure-resistant component has a wire connection hole, the wire assembly is electrically connected to the wire connection portion, and is electrically connected to an external component through the wire connection hole;

[0013] The wire assembly and the pressure-resistant component form a sealed structure.

[0014] In one embodiment, the conductor assembly includes a conductor and a conductor sheath covering the conductor. A conductor clearance groove is formed on the side of the pressure-resistant member near the conductor connection portion. The conductor connection hole is opened at the bottom of the conductor clearance groove. The conductor is electrically connected to the conductor connection portion. The conductor sheath is interference-fitted with the pressure-resistant member in the conductor connection hole.

[0015] Understandably, by forming wire clearance grooves near the wire connection in the pressure-resistant component, it is possible to prevent the wire from being excessively bent or pressed onto the pressure sensing component due to insufficient space, thus preventing interference with the deformation of the pressure sensing component.

[0016] In one embodiment, the pressure transmitter further includes a limiting member that is positioned within the housing and abuts against the pressure-resistant member, thereby limiting the pressure-resistant member within the housing.

[0017] It is understandable that by setting limiters to limit the pressure-resistant components, it is possible to prevent the pressure-resistant components from shifting during the injection of sealant, which could lead to sealant leakage or incomplete sealing.

[0018] In one embodiment, the limiting member is configured as a deformable retaining ring, and a snap-fit ​​groove is formed on the inner wall of the housing. The deformable retaining ring can snap into the snap-fit ​​groove to limit its position within the housing.

[0019] In one embodiment, the deformable retaining ring is configured as a notched ring, and the notched ring is provided with an operating hole for engaging with an external operating component to achieve deformation.

[0020] Understandably, by setting an operating hole on a ring with a notch, users can easily manipulate the operating hole using the operating parts to deform the ring, thereby improving operating efficiency.

[0021] In one embodiment, the pressure-resistant member has a limiting portion extending along the first direction, one end of the limiting portion abutting against the limiting member along the first direction, and the other end abutting against the pressure sensing component.

[0022] In one embodiment, the pressure sensing component further includes a ceramic body and a circuit board. The deformable portion is disposed on the ceramic body and is capable of deforming in response to pressure. The circuit board is disposed on the side of the ceramic body near the second cavity and is confined on the ceramic body, and is capable of generating an electrical signal based on the deformation of the ceramic body.

[0023] In one embodiment, the pressure transmitter further includes a sealing ring disposed on the side of the ceramic body away from the second cavity and located between the ceramic body and the housing.

[0024] This application also provides the following technical solutions:

[0025] An electrical device comprising a pressure transmitter as described in any of the above embodiments.

[0026] Compared with the prior art, the pressure transmitter is equipped with a pressure-resistant component, which divides the receiving cavity into a first cavity and a second cavity. The pressure sensor and the sealant are placed in the first cavity and the second cavity respectively. In this way, the pressure-resistant component serves to separate the sealant from the pressure sensor, so that the sealant will not affect the deformation of the pressure sensor after curing, thereby improving the detection accuracy and operational stability of the pressure transmitter. Attached Figure Description

[0027] 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.

[0028] Figure 1 A schematic diagram of the pressure transmitter structure provided in this application.

[0029] Figure 2 This is a schematic diagram of the internal structure of the pressure transmitter provided in this application.

[0030] Figure 3 For this application Figure 2 Enlarged view of point A in the middle.

[0031] Figure 4 Exploded view of the pressure transmitter provided in this application.

[0032] The component labels are as follows:

[0033] 100. Pressure transmitter; 10. Housing; 11. Receiving cavity; 111. First cavity; 112. Second cavity; 12. Opening; 13. Connecting part; 14. Snap-fit ​​groove; 20. Sealant; 30. Pressure sensing assembly; 31. Ceramic body; 311. Deformable part; 312. Cavity; 32. Circuit board; 33. Wire connection part; 40. Pressure-resistant component; 41. Limiting part; 42. Wire connection hole; 43. Wire clearance groove; 50. Wire assembly; 51. Wire; 52. Wire sheath; 53. Terminal block; 60. Limiting part; 61. Deformable retaining ring; 611. Notch; 612. Ring; 613. Operating hole; 70. Sealing ring. Detailed Implementation

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] Please see Figures 1 to 4 This application provides a pressure transmitter 100, which can be used for detecting the pressure of media in various electronic devices, such as: water system pressure detection in coffee machines, pressure difference detection between the inlet and outlet of filter cartridges in water purifiers, water pump outlet pressure monitoring in dishwashers, water inlet or drain pressure detection in washing machines, and water mist pressure control detection in humidifiers.

[0040] Specifically, the pressure transmitter 100 includes a housing 10, a sealant 20, a pressure sensing component 30, and a pressure-resistant member 40. The housing 10 forms a receiving cavity 11 that communicates with an external component, and the receiving cavity 11 has an opening 12 facing a first direction x. The sealant 20 is used to seal the opening 12. The pressure sensing component 30 is disposed in the receiving cavity 11 and confined within the housing 10. The pressure sensing component 30 has a deformable portion 311 for deforming in response to pressure from the external component. The pressure-resistant member 40 is disposed in the receiving cavity 11 and confined within the housing 10. The pressure-resistant member 40 divides the receiving cavity 11 into a first cavity 111 that communicates with an external component and a second cavity 112 that communicates with the opening 12. The first cavity 111 is used to accommodate the pressure sensing component 30, and the second cavity 112 is used to accommodate the sealant 20. The pressure-resistant member 40 and the deformable portion 311 are spaced apart. Thus, by setting up a pressure-resistant component 40, the present application divides the receiving cavity 11 into a first cavity 111 and a second cavity 112, and places the pressure sensor and the sealant 20 in the first cavity 111 and the second cavity 112 respectively. In this way, the pressure-resistant component 40 serves to separate the sealant 20 from the pressure sensor, so that the sealant 20 will not affect the deformation of the pressure sensor after curing, thereby improving the detection accuracy and operational stability of the pressure transmitter 100.

[0041] like Figure 1 and Figure 4 As shown, the housing 10 has a connecting part 13 at its lower end along the first direction x. The connecting part 13 is connected to the external components by means of threaded connection, snap-fit ​​connection, flange connection, etc., and the connecting part 13 is provided with a communication channel (not shown) that can connect the external components and the receiving cavity 11.

[0042] Furthermore, the housing 10 has an opening 12 at its upper end along the first direction x, and the opening 12 is sealed by a sealant 20. Here, the sealant 20 can be made of materials such as silicone, epoxy resin, or polyurethane.

[0043] like Figure 2 and Figure 3 As shown, the pressure sensing component 30 also includes a ceramic body 31 and a circuit board 32. The deformable part 311 is disposed on the ceramic body 31 and can deform in response to pressure. The circuit board 32 is disposed on the side of the ceramic body 31 near the second cavity 112 and is confined on the ceramic body 31, and can generate an electrical signal according to the deformation of the ceramic body 31.

[0044] Furthermore, the deformable portion 311 of the ceramic body 31 is provided with a cavity 312 so that the ceramic body 31 can deform in response to pressure.

[0045] In one embodiment, the pressure-resistant member 40 has a limiting portion 41 extending along a first direction x, one end of the limiting portion 41 abutting against the limiting member 60 along the first direction x, and the other end abutting against the pressure sensing component 30.

[0046] like Figure 3 and Figure 4 As shown, the pressure transmitter 100 also includes a wire assembly 50, a wire connection portion 33 on the pressure sensing component 30, and a wire connection hole 42 on the pressure-resistant component 40. The wire assembly 50 is electrically connected to the wire connection portion 33 and is electrically connected to an external component through the wire connection hole 42. A sealing structure is formed between the wire assembly 50 and the pressure-resistant component 40.

[0047] In one embodiment, the lead assembly 50 includes a lead wire 51 and a lead wire sheath 52 wrapped around the lead wire 51. A lead wire clearance groove 43 is formed on the side of the pressure-resistant member 40 near the lead wire connection portion 33. A lead wire connection hole 42 is formed at the bottom of the lead wire clearance groove 43. The lead wire 51 is electrically connected to the lead wire connection portion 33, and the lead wire sheath 52 is interference-fitted with the pressure-resistant member 40 within the lead wire connection hole 42. By forming lead wire clearance grooves 43 on the pressure-resistant member 40 near the lead wire connection portion 33, it is possible to prevent the lead wire 51 from being excessively bent or pressed onto the pressure sensing assembly 30 due to insufficient space, thus preventing interference with the deformation of the pressure sensing assembly 30. In addition, the wire clearance groove 43 allows the outer sheath 52 of the wire to extend further into the pressure-resistant component 40 to wrap the wire 51. This prevents the outer sheath 52 from coming out of the wire connection hole 42, which could cause the wire 51 to come into direct contact with the pressure-resistant component 40 and potentially cause wear. Furthermore, since the outer sheath 52 and the pressure-resistant component 40 are press-fitted to seal the wire connection hole 42, the wire clearance groove 43 also ensures that the outer sheath 52 and the pressure-resistant component 40 maintain a good press-fit, preventing poor sealing and glue leakage.

[0048] Furthermore, the pressure transmitter 100 also includes a terminal block 53, which is connected to the wire connection portion 33 via a wire 51, and is used to connect to a device that can receive signals provided by the pressure transmitter 100, and can provide pressure signals to it.

[0049] like Figure 3 and Figure 4 As shown, the pressure transmitter 100 also includes a limiting member 60, which is located within the housing 10 and abuts against the pressure-resistant member 40, thereby limiting the pressure-resistant member 40 within the housing 10. Thus, by setting the limiting member 60 to limit the pressure-resistant member 40, it is possible to prevent the pressure-resistant member 40 from shifting during the injection of sealant 20, thereby preventing sealant 20 leakage or incomplete sealing.

[0050] In this embodiment, the limiting member 60 is disposed on the outside of the wire clearance groove 43. Specifically, the wire clearance groove 43 of the limiting member 60 is a semi-circular groove. The pressure-resistant member 40 is plate-shaped / sheet-shaped to reduce space occupation. Therefore, the pressure-resistant member 40 forms a semi-circular boss facing the second cavity 112, and there is a gap between the semi-circular boss and the housing 10. The limiting member 60 can be sleeved on the outside of the boss, located in the gap and snapped into the housing 10, while abutting against the pressure-resistant member 40, thereby limiting the pressure-resistant member 40.

[0051] In one embodiment, the limiting member 60 is configured as a deformable retaining ring 61, and a snap-fit ​​groove 14 is formed on the inner wall of the housing 10. The deformable retaining ring can snap into the snap-fit ​​groove 14 to limit the position of the housing 10.

[0052] Furthermore, the deformable retaining ring 61 is configured as a ring 612 with a notch 611, and the ring 612 with the notch 611 is provided with an operating hole 613, which is used to cooperate with an external operating component to achieve deformation. By providing an operating hole 613 on the ring 612 with the notch 611, the user can easily operate the operating hole 613 with the operating component to deform the ring 612, thereby improving operating efficiency.

[0053] In this embodiment, two operation holes 613 are configured, and the two operation holes 613 are respectively located on the inner side of the ring 612 near the notch 611, which facilitates operation by the user through the operating tool. Here, the operating tool can be tweezers, clamps, or other clamps.

[0054] In one embodiment, the pressure transmitter 100 further includes a sealing ring 70, which is disposed on the side of the ceramic body 31 away from the second cavity 112 and located between the ceramic body 31 and the housing 10. In this embodiment, the sealing ring 70 is configured as an O-ring, and its upper and lower sides along the first direction x respectively abut against and seal the ceramic body 31 and the housing 10. The portion of the second cavity 112 enclosed by the ceramic body 31, the O-ring, and the housing 10 communicates with the connecting channel and forms a sealing structure.

[0055] This application also provides the following technical solutions:

[0056] An electrical device comprising a pressure transmitter 100 as described in any of the above embodiments.

[0057] 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.

[0058] 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 transmitter, used in electrical equipment for detecting the pressure of a medium, wherein the electrical equipment is provided with external components, characterized in that, The pressure transmitter (100) includes: The housing (10) has a receiving cavity (11) communicating with an external component, the receiving cavity (11) having an opening (12) facing a first direction. Sealant (20) is used to seal the opening (12); A pressure sensing component (30) is disposed in the receiving cavity (11) and confined within the housing (10), the pressure sensing component (30) having a deformable portion (311) for deforming in response to external component pressure; A pressure-resistant component (40) is disposed in the receiving cavity (11) and confined within the housing (10). The pressure-resistant component (40) divides the receiving cavity (11) into a first cavity (111) communicating with an external component and a second cavity (112) communicating with the opening (12). The first cavity (111) is used to receive the pressure sensing component (30), and the second cavity (112) is used to receive the sealant (20). The pressure-resistant component (40) is spaced apart from the deformable portion (311).

2. The pressure transmitter according to claim 1, characterized in that, The pressure transmitter (100) further includes a wire assembly (50), the pressure sensing assembly (30) has a wire connection part (33), the pressure-resistant component (40) has a wire connection hole (42), the wire assembly (50) is electrically connected to the wire connection part (33), and is electrically connected to an external component through the wire connection hole (42); A sealed structure is formed between the wire assembly (50) and the pressure-resistant component (40).

3. The pressure transmitter according to claim 2, characterized in that, The conductor assembly (50) includes a conductor (51) and a conductor sheath (52) wrapped around the conductor (51). A conductor clearance groove (43) is formed on the side of the pressure-resistant member (40) near the conductor connection portion (33). The conductor connection hole (42) is opened at the bottom of the conductor clearance groove (43). The conductor (51) is electrically connected to the conductor connection portion (33). The conductor sheath (52) is interference-fitted with the pressure-resistant member (40) in the conductor connection hole (42).

4. The pressure transmitter according to claim 1, characterized in that, The pressure transmitter (100) further includes a limiting member (60) which is located in the housing (10) and abuts against the pressure-resistant member (40), thereby limiting the pressure-resistant member (40) in the housing (10).

5. The pressure transmitter according to claim 4, characterized in that, The limiting member (60) is configured as a deformable retaining ring (61), and a snap-fit ​​groove (14) is formed on the inner wall of the housing (10). The deformable retaining ring can snap into the snap-fit ​​groove (14) to limit its position on the housing (10).

6. The pressure transmitter according to claim 5, characterized in that, The deformable retaining ring (61) is configured as a ring (612) with a notch (611), and the ring (612) with the notch (611) is provided with an operating hole (613), which is used to cooperate with an external operating component to achieve deformation.

7. The pressure transmitter according to any one of claims 4-6, characterized in that, The pressure-resistant member (40) has a limiting portion (41) extending along the first direction, one end of the limiting portion (41) abutting against the limiting member (60) along the first direction, and the other end abutting against the pressure sensing assembly (30).

8. The pressure transmitter according to claim 1, characterized in that, The pressure sensing component (30) further includes a ceramic body (31) and a circuit board (32). The deformable part (311) is disposed on the ceramic body (31) and can deform in response to pressure. The circuit board (32) is disposed on the side of the ceramic body (31) near the second cavity (112) and is located on the ceramic body (31), and can generate an electrical signal according to the deformation of the ceramic body (31).

9. The pressure transmitter according to claim 8, characterized in that, The pressure transmitter (100) also includes a sealing ring (70), which is disposed on the side of the ceramic body (31) away from the second cavity (112) and located between the ceramic body (31) and the housing (10).

10. An electrical device, characterized in that, Includes the pressure transmitter (100) as described in any one of claims 1-9.

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