Pressure sensor

Abstract

The utility model provides a pressure sensor, and relates to the sensor technology field, the pressure sensor comprises a housing, the housing comprises a first housing and a second housing, one end of the second housing is fixedly connected with the first housing; the pressure sensing unit is provided with a pressure sensing channel, the pressure sensing unit comprises a pressure sensing port, a pressure sensing base and a pressure sensing chip which are fixedly connected together, a containing cavity is defined by the shell and the pressure sensing base, and the pressure sensing port and the pressure sensing chip are located in the containing cavity; the support is located in the containing cavity, one end of the support is fixedly connected to the pressure sensing base, and the pressure sensing port is located in the support; the circuit board is positioned in the accommodating cavity and is arranged on the bracket; the pressure sensor comprises a first shell and a second shell, the first shell is provided with an inner side wall, the plugging assembly comprises a plastic part and a conduction part located in the plastic part, at least part of the plastic part is attached to the inner side wall of the first shell, and the pressure sensor is convenient to assemble and has good stability.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, specifically to a pressure sensor. Background Technology

[0002] Pressure sensors are required in hydraulic control systems of industrial and construction machinery to monitor system pressure in real time and provide feedback to the control unit. Currently available hydraulic pressure sensors are complex in design and expensive. Typically, a sensor requires two PCBs (upper and lower), along with terminals connecting them. Furthermore, because there is no reliable electrical ground between the PCB and the sensor housing, a separate grounding design for the PCB is necessary. Since hydraulic control systems require multiple sensors, the high cost of these sensors has become a major pain point in the industry. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a pressure sensor that can solve the problems of complex structural design and high cost of pressure sensors used in hydraulic control systems in the prior art.

[0004] To achieve the above and other objectives, this utility model is implemented through the following technical solution: This utility model provides a pressure sensor, the pressure sensor comprising: a housing, the housing comprising a first housing and a second housing, one end of the second housing being fixedly connected to the first housing; a pressure sensing unit having a pressure sensing channel, one end of the pressure sensing unit being fixedly connected to the other end of the second housing, the pressure sensing unit comprising a pressure sensing port, a pressure sensing base, and a pressure sensing chip fixedly connected together, the housing and the pressure sensing port forming a receiving cavity, the pressure sensing base and the pressure sensing chip being located within the receiving cavity; a bracket located within the receiving cavity, one end of the bracket being fixedly connected to the pressure sensing port, the pressure sensing base being located within the bracket; a circuit board located within the receiving cavity and disposed on the bracket; and a connector assembly disposed within the receiving cavity and located above the circuit board, the connector assembly comprising a plastic part and a conductive part located inside the plastic part, the plastic part being at least partially attached to the inner sidewall of the first housing, the circuit board, the conductive part, and the pressure sensing chip being electrically connected.

[0005] This invention designs a pressure sensor that greatly simplifies the number of sensor components and assembly process. The sensor consists of main components such as a pressure-sensing unit, an electrical conditioning module, a connector assembly, an elastic element, and a housing. The pressure-sensing unit consists of a separate pressure-sensing terminal and a pressure-sensing chip.

[0006] The split-type pressure sensing end offers greater cost advantages by ensuring a unified design and materials for the pressure sensing base and allowing for customization of the pressure sensing port. In addition to pressure sensing features, the pressure sensing port integrates threaded mounting interfaces, sealing interfaces, and hexagonal mounting features. An integrated throttle valve can also be optionally added, enhancing the sensor's ability to withstand rapid pressure pulses from the system.

[0007] The electrical conditioning module mainly consists of a metal bracket, a circuit board, and electronic components such as conditioning chips. The small flanged contact pieces on the bracket serve a grounding function and also help to overcome elastic forces and secure the housing during assembly. The metal bracket supports the PCB and provides an interface for soldering to the pressure sensing unit. At the same time, the metal bracket soldered to the pressure sensing unit also meets the grounding requirements of the PCB, eliminating the need for a separate grounding design feature.

[0008] The PCB has small windows to provide space for the electrical connection between the pressure-sensing chip and the PCB. It also has several circular copper-outlets for electrical connections to the elastic component. To ensure the PCB's mechanical strength under maximum compression conditions, a support frame is typically placed near the bottom of the copper-outlets. This support interface effectively supports the PCB while providing sufficient space on both sides for electrical components, allowing the sensor to use only a single PCB, greatly simplifying the design and saving costs.

[0009] The connector assembly is formed by bonding a metal housing and a plastic component. The plastic component has bosses to ensure the relative position of the plastic component and the metal housing. The plastic component also has several internal holes on these bosses, with conductive pins protruding from the bottom of the holes. The plastic component also acts as a stabilizer for the elastic component, ensuring its installation position and stability during operation. The metal housing uses a split design, which is more cost-effective. The circular second housing can be molded using a deep-drawing process. The threaded first housing is machined. The first and second housings are fixed and sealed by welding. The second housing and the pressure sensing unit are also fixed and sealed by welding. A one-piece design, on the other hand, is machined as a single unit, resulting in higher unit costs. Attached Figure Description

[0010] Figure 1 The diagram shown is a structural schematic of the pressure sensor of this utility model.

[0011] Figure 2 The image shown is a cross-sectional view of the pressure sensor of this utility model.

[0012] Figure 3 The diagram shown is a structural schematic of the pressure-sensing unit of this utility model.

[0013] Figure 4 The image shown is an exploded view of the pressure-sensing unit of this invention.

[0014] Figure 5 The diagram shown is a structural schematic of the pressure-sensitive base of this utility model.

[0015] Figure 6 The diagram shown is a partial structural schematic of the pressure sensor of this utility model.

[0016] Figure 7 The diagram shows the electrical connection relationship of the pressure sensor of this utility model.

[0017] Numbering on the map:

[0018] 1-Housing shell, 11-First housing shell, 12-Second housing shell, 11a-First thread;

[0019] 2-Pressure sensing unit, 21-Pressure sensing port, 21a-Second thread, 21b-Outer edge positioning step, 21b1-Third ring, 21b2-Fourth ring, 21b3-Fifth ring, 21c-Positioning post, 21d-Annular groove, 21e-Central positioning step, 21e1-First ring, 21e2-Second ring, 22-Pressure sensing base, 221-Stepped slot, 23-Pressure sensing chip;

[0020] 3-Bracket, 31-Bracket body, 32-Support plate, 33-Baffle, 34-Through hole, 35-Contact piece, 36-Positioning port;

[0021] 4-Circuit board, 41-Opening, 42-Exposed copper port;

[0022] 5-Connector assembly, 51-Plastic part, 52-Conductive component, 53-Boss, 54-Inner hole, 55-Limiting post;

[0023] 6-Elastic element;

[0024] C - Receptacle, T - Pressure-sensing channel, V - Throttling orifice. Detailed Implementation

[0025] Please see Figures 1 to 7 The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0026] like Figure 1 and Figure 2As shown, this utility model discloses a pressure sensor, which includes a housing 1. The housing 1 is a hollow housing with an inner cavity. The housing 1 includes a first housing 11 and a second housing 12. The bottom of the first housing 11 and the top of the second housing 12 are fixedly connected. The first housing 11 includes a connector end 112 and a main body end 111. The outer diameter of the main body end 111 can be equal to the outer diameter of the second housing 12, and the outer diameter of the connector end 112 can be smaller than the outer diameter of the second housing 12. A first thread 11a is provided on the outer peripheral wall of the connector end 112, which can facilitate connection with the interface of the signal output end.

[0027] like Figures 2 to 4 The pressure sensor includes a pressure sensing unit 2, which has a pressure sensing channel T. The pressure sensing unit 2 includes a pressure sensing port 21, a pressure sensing base 22, and a pressure sensing chip 23 connected together. The bottom outer wall of the pressure sensing port 21 has a second thread 21a, which facilitates connection with the input interface of the pressure medium. The pressure sensing port 21 has an annular groove 21d above the second thread 21a, and a sealing ring can be provided in the annular groove 21d. The top of the pressure sensing port 21 has a positioning step, which includes a central positioning step 21e and an outer edge positioning step 21b. The central positioning step 21e includes a first ring 21e1 and a second ring 21e2 whose outer diameters increase sequentially from top to bottom. The first ring 21e1 is located above the second ring 21e2. The outer positioning step 21b includes a third ring 21b1, a fourth ring 21b2, and a fifth ring 21b3 whose outer diameters increase sequentially from top to bottom. A positioning post 21c is provided at the outer positioning step 21b, and the positioning post 21c is located between the third ring 21b1 and the fourth ring 21b2.

[0028] like Figure 3 and Figure 5 As shown, the bottom of the pressure-sensitive base 22 has a stepped groove 221, and the stepped groove 221 and the central positioning step 21e are matched, positioned and fixedly connected, for example by laser welding. The pressure-sensitive chip 23 is provided on the top of the pressure-sensitive base 22.

[0029] like Figure 2 As shown, the housing 1 and the pressure-sensing port 21 together form a receiving cavity C, and the bottom of the pressure-sensing channel T may be provided with a throttling port V with a reduced inner diameter.

[0030] like Figure 2 and Figure 4As shown, the bottom of the second housing 12 can be fixedly connected to the outer edge positioning step 21b. Specifically, the second housing 12 is located between the fourth ring 21b2 and the fifth ring 21b3. Furthermore, the bottom of the second housing 12 is located on the fifth ring 21b3, and the bottom end of the inner cavity sidewall of the second housing 12 is positioned against the fourth ring 21b2.

[0031] like Figure 2 and Figure 4 As shown, the pressure sensor includes a bracket 3, which can be a cylindrical structure with a cavity. The bracket 3 is located inside the receiving cavity C. The bottom of the bracket 3 can be fixed to the outer edge positioning step 21b. Specifically, the bracket 3 is located between the third ring 21b1 and the fourth ring 21b2. For example, the bottom of the bracket 3 is located on the fourth ring 21b2. The bottom cavity sidewall of the bracket 3 is attached to the third ring 21b1. The pressure-sensing base 22 can be located inside the cavity of the bracket 3.

[0032] like Figure 6 and Figure 7 As shown, the bottom of the bracket 3 is provided with a positioning port 36 that matches the positioning post 21c. The bracket 3 includes a bracket body 31, and the top of the bracket body 31 is provided with several support plates 32 that bend towards the center of the inner cavity. A baffle 33 is provided between the support plates 32. The side wall of the bracket body 31 is provided with multiple through holes 34, and several protruding contact pieces 35 are provided at the through holes 34. The contact pieces 35 contact the inner side wall of the second housing 12 to achieve grounding. The contact pieces 35 and the housing 1 are interference-fitted, which can avoid the installation inconvenience caused by the resistance of the elastic element 6 during installation.

[0033] like Figure 2 and Figure 7 As shown, the pressure sensor includes a circuit board 4, which is located within the receiving cavity C and mounted on the bracket 3. Specifically, the circuit board 4 can be mounted on the support plate 32 and located within the baffle 33. An opening 41 can be provided in the middle of the circuit board 4 to facilitate electrical connection between the circuit board 4 and the pressure-sensing chip 23. The circuit board 4 also has several copper-exposed ports 42.

[0034] like Figure 2 and Figure 6As shown, the pressure sensor includes a connector assembly 5, which includes a plastic part 51. The plastic part 51 can be made of polymer plastic and can be at least partially attached to the inner wall of the first housing 11. The attachment can include adhesive. The connector assembly 5 includes a conductive member 52 disposed inside the plastic part 51. Furthermore, the connector assembly 5 can be integrally injection molded. The conductive member 52 can be electrically connected to the circuit board 4. A limiting post 55 is provided at the bottom of the plastic part 51. An elastic element 6 can be provided inside the circuit board 4. The elastic element 6 can be a spring, a sheet, conductive foam, etc. One end of the elastic element 6 contacts the circuit board 4, and the other end of the elastic element 6 contacts the conductive element 52. The elastic element 6 is in a compressed state. The support plate 32 can be provided at the bottom surface of the copper outlet 42. This support structure can not only support the circuit board 4 well, but also provide enough space on both sides of the circuit board 4 for electrical components. This allows the sensor to use only one PCB circuit board 4, which greatly simplifies the design and saves costs.

[0035] like Figure 6 As shown, the plastic part 51 has a boss 53 and an inner hole 54 on the upper surface of the inner top wall of the main body end 111 of the first housing 11. The boss 53 and the inner hole 54 can facilitate the stabilization of the relative position of the plastic part 51 and the conductive member 52 during injection molding. The bottom of the inner hole 54 exposes the conductive member 52. The plastic part 51 also serves to stabilize the elastic member 6, ensuring the installation position accuracy of the elastic member 6 and maintaining a stable state during operation. The boss 53 also helps to ensure the bonding thickness when the first housing 11 and the plastic part 51 are bonded, ensuring a stable bonding force between the first housing 11 and the plastic part 51.

[0036] The assembly process of this utility model can be as follows: first, the pressure-sensing base 22 and the pressure-sensing port 21 are welded together; then, the bracket 3 is welded onto the pressure-sensing port 21; then, the circuit board 4 is assembled, and the circuit board 4 and the pressure-sensing chip 23 are electrically connected by wire bonding; then, the integrally injection-molded first housing 11 with the elastic element 6 and the connector assembly 5 are pressed onto the circuit board 6; finally, the first housing 11 and the second housing 12 are welded together.

[0037] Therefore, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value. The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit this utility model. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A pressure sensor, characterized in that, The pressure sensor includes: The housing includes a first housing and a second housing, one end of the second housing being fixedly connected to the first housing; A pressure-sensing unit has a pressure-sensing channel. One end of the pressure-sensing unit is fixedly connected to the other end of the second housing. The pressure-sensing unit includes a pressure-sensing port, a pressure-sensing base, and a pressure-sensing chip fixedly connected together. The housing and the pressure-sensing port form a receiving cavity, and the pressure-sensing base and the pressure-sensing chip are located inside the receiving cavity. A bracket is located within the receiving cavity, one end of which is fixed to the pressure-sensing port, and the pressure-sensing base is located within the bracket; The circuit board is located within the receiving cavity and is mounted on the bracket; A connector assembly is disposed within the receiving cavity and located above the circuit board. The connector assembly includes a plastic part and a conductive element located inside the plastic part. The plastic part is at least partially attached to the inner sidewall of the first housing. The circuit board, the conductive element, and the pressure-sensitive chip are electrically connected.

2. The pressure sensor according to claim 1, characterized in that: The pressure-sensing port has a central positioning step and an outer positioning step at its top. The pressure-sensing base is fixedly connected to the central positioning step, and the second housing and the bracket are fixedly connected to the outer positioning step.

3. The pressure sensor according to claim 2, characterized in that: The central positioning step includes a first ring and a second ring, and the bottom of the pressure-sensitive base is provided with a stepped groove, which matches the first ring and the second ring.

4. The pressure sensor according to claim 2, characterized in that: The outer edge positioning step includes a third ring, a fourth ring, and a fifth ring. The bottom of the bracket is disposed between the third ring and the fourth ring, and the bottom of the second housing is disposed between the fourth ring and the fifth ring.

5. The pressure sensor according to claim 1, characterized in that: The bracket includes a bracket body, the top of which is bent towards the center to form a support plate, a baffle is provided between the support plates, a through hole is provided on the side wall of the bracket body, and a contact piece is provided on the through hole, the contact piece being in contact with the second housing.

6. The pressure sensor according to claim 1, characterized in that: The first housing includes a connector end and a main body end, the main body end being connected to the second housing, and the plastic part having a boss and an inner hole on the surface near the inner top wall of the main body end.

7. The pressure sensor according to claim 1, characterized in that: The pressure sensor includes an elastic element, the two ends of which are in contact with the conductive element and the circuit board, respectively.

8. The pressure sensor according to claim 7, characterized in that: The bottom of the plastic part has a limiting post, and the elastic element is located inside the limiting post.

9. The pressure sensor according to claim 1, characterized in that: The pressure-sensing channel is equipped with a throttling orifice with a reduced inner diameter.

10. The pressure sensor according to claim 6, characterized in that: The conductive element is connected to the bottom of the inner hole.

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