Pressure sensor

Abstract

The utility model discloses a pressure sensor, and belongs to the technical field of pressure sensing equipment. The device mainly comprises a first split part and a second split part, the first split part comprises a shell which is fixedly connected with a pressure interface, a sealing ring, a pressure detection core body and a cover plate which is provided with an upper cavity and a lower cavity are sequentially arranged in an accommodating cavity of the shell from bottom to top, and the upper cavity and the lower cavity are two independent cavities which are not communicated with each other; a PCBA board is arranged in the lower cavity, a pin header extending towards the opening end of the cover plate is electrically connected to the PCBA board, and the end, away from the PCBA board, of the pin header protrudes out of the end face of the opening end of the cover plate; the second split part comprises a cable and a buckle. According to the utility model, the structural design is simple and reasonable, the glue filling cavity, the PCBA board installation cavity and the pressure detection core body installation cavity are independently separated and do not interfere with each other, the electrical performance is stable, the glue consumption is low, the production cost is low, and the practical performance is strong.

Description

Technical Field

[0001] This utility model belongs to the technical field of pressure sensing equipment. Specifically, it relates to a pressure sensor with a reasonable and simple structural design, stable structure, easy product manufacturing, and independent separation of three cavities: the glue potting cavity, the PCBA board mounting cavity, and the pressure detection core mounting cavity. It also features stable electrical contact, low glue consumption, and low production cost. Background Technology

[0002] Pressure sensors are key components that ensure the normal operation of air conditioning systems. They are mainly used to monitor the pressure of the refrigerant, thereby helping the control system maintain optimal operating conditions.

[0003] The patent application, published on June 14, 2024, with publication number CN118190230A, is entitled "Pressure Sensor and Manufacturing Method Thereof." It mainly includes: "a housing; a calibration amplification circuit board disposed within the housing; a sealing post disposed within the housing and stacked with the calibration amplification circuit board, the sealing post having a metal needle electrically connected to the calibration amplification circuit board; a pressure chip flip-chip soldered to the metal needle, with the sensing surface of the pressure chip located on the side of the sealing post facing away from the calibration amplification circuit board; an interface base welded to the sealing post to form a sensing sealing cavity, the pressure chip located within the sensing sealing cavity; and a pressure interface welded to the interface base and communicating with the sensing sealing cavity, the pressure interface being used for connection to an external pressure pipeline."

[0004] Traditional pressure sensors suffer from the following technical problems: 1. The circuit board (PCBA board) is installed inside the potting cavity. Because of this additional circuit board, the traditional potting cavity has a large capacity, leading to high glue consumption and production costs. 2. For structural stability, traditional pressure sensors typically use a semi-open potting method. However, with small openings and large amounts of glue, this method easily causes glue to overflow onto the metal housing, contaminating the product and increasing rework intensity. 3. Traditional pressure sensors are complex to assemble and relatively difficult to manufacture. Poor assembly at the sealing post can easily cause glue to flow into the pressure chip, affecting the measurement accuracy.

[0005] In addition, some pressure sensor cables are currently electrically connected by plugging connectors into connectors on the circuit board. Both connectors are placed in a potting cavity, and the filling of the potting compound can easily lead to poor contact between the two connectors. Utility Model Content

[0006] The purpose of this utility model is to address the shortcomings of existing technologies by providing a pressure sensor with a reasonable and simple structural design, stable structure, easy product manufacturing, and independent separation of the three cavities: the potting cavity, the PCBA board mounting cavity, and the pressure detection core mounting cavity. This results in stable electrical contact, low glue consumption, and low production cost.

[0007] This utility model is achieved through the following technical solution:

[0008] A pressure sensor includes a first split portion and a second split portion;

[0009] The first split part includes a housing with a pressure interface fixedly attached. A sealing ring, a pressure sensing core, and a cover plate with an upper cavity and a lower cavity are sequentially installed from bottom to top within the housing cavity. The upper cavity and the lower cavity are two independent cavities that are not connected. A PCBA board electrically connected to the pressure sensing core is housed within the lower cavity. A pin array extending towards the opening end of the cover plate is electrically connected to the PCBA board, with one end of the pin array away from the PCBA board protruding from the end face of the opening end of the cover plate.

[0010] The second split part includes a cable electrically connected to the pin header and a buckle detachably fixed to the cover plate, wherein the buckle is in sealed contact with the cover plate; the buckle's hollow cavity is connected to the upper cavity, and the buckle's hollow cavity and the upper cavity together form a potting cavity for potting protective glue.

[0011] Preferably, the cover plate has a hollow structure, and the partition divides the hollow cavity of the cover plate into the upper cavity and the lower cavity.

[0012] Preferably, the pin header passes through the partition, and the contact point between the pin header and the partition is sealed with adhesive.

[0013] Preferably, the connector on the PCBA board, which is soldered to the pin header, maintains an electrical connection with the PCBA board.

[0014] Preferably, the end face of the buckle opposite to the cover plate is provided with an installation groove that matches the open end of the cover plate; the installation groove is embedded with a buckle sealing ring, or the installation groove is coated with a sealant that provides a sealing effect.

[0015] Preferably, the buckle has buckle plates with buttonholes on both sides; the cover plate has protrusions that match the buttonholes.

[0016] Preferably, the pressure interface is a copper pipe pressure interface or a cylindrical connector pressure interface.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This utility model has a simple and reasonable structural design with strong structural stability. It independently separates the three cavities: the potting cavity, the PCBA board mounting cavity, and the pressure detection core mounting cavity, so that they do not interfere with each other. It has stable electrical performance, low glue consumption, easy assembly and manufacturing, low production cost, and strong practical performance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the pressure interface of this utility model when it is a cylindrical connector pressure interface.

[0020] Figure 2 This is a utility model Figure 1 Enlarged view of point A in the middle.

[0021] Figure 3 This is an exploded structural diagram of the pressure interface of this utility model when it is a cylindrical connector pressure interface.

[0022] Figure 4 This is a utility model Figure 3 Enlarged view of section B in the middle.

[0023] Figure 5 This is a utility model Figure 3 Enlarged view of point C in the middle.

[0024] Figure 6 This is a cross-sectional structural diagram of the pressure interface of this utility model when it is a cylindrical connector pressure interface.

[0025] Figure 7 This is a utility model Figure 6 Enlarged view of point D in the middle.

[0026] Figure 8 This is a schematic diagram of the first split part of the structure when the pressure interface of this utility model is a copper tube pressure interface.

[0027] In the diagram: 1. First split part; 11. Housing; 12. Sealing ring; 13. Pressure detection core; 14. Cover plate; 141. Upper cavity; 142. Lower cavity; 143. Partition plate; 144. Protrusion; 145. Open end; 15. PCBA board; 151. Connector; 152. Pin header; 16. Copper tube pressure interface; 17. Cylindrical connector pressure interface; 2. Second split part; 21. Buckle; 211. Buckle hollow cavity; 214. Button eye; 215. Buckle plate; 22. Cable. Detailed Implementation

[0028] To enable readers to better understand the design intent of this utility model, the technical solution described below is further described in conjunction with embodiments. It should be noted that directional terms that may appear in the following paragraphs, including but not limited to "up," "down," "left," "right," "front," and "back," are based on the visual orientation shown in the accompanying drawings and should not be considered as limitations on the scope of protection or technical solution of this utility model. Their purpose is solely to facilitate a better understanding of the technical solution described in this utility model by those skilled in the art.

[0029] In this specification, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] Example 1

[0031] like Figures 1 to 7 A pressure sensor includes a first split part 1 and a second split part 2;

[0032] The first split part 1 includes a housing 11 with a pressure interface fixedly connected to it, the pressure interface being a cylindrical connector pressure interface 17. Within the housing 11, from bottom to top, a sealing ring 12, a pressure sensing core 13, and a cover plate 14 with an upper cavity 141 and a lower cavity 142 are sequentially installed, wherein the upper cavity 141 and the lower cavity 142 are two independent cavities that are not connected. The lower cavity 142 houses a PCBA board 15 electrically connected to the pressure sensing core 13; a pin header 152 extending towards the opening end 145 of the cover plate 14 is electrically connected to the PCBA board 15, with the end of the pin header 152 away from the PCBA board 15 protruding from the end face of the opening end 145 of the cover plate 14. The opening of the housing 11 is fixedly connected to the cover plate 14 using a necking process.

[0033] The second split part 2 includes a cable 22 electrically connected to the pin header 152 and a buckle 21 detachably fixed to the cover plate 14. The buckle 21 is in sealed contact with the cover plate 14. The buckle hollow cavity 211 of the buckle 21 is connected to the upper cavity 141, and the buckle hollow cavity 211 and the upper cavity 141 constitute a potting cavity for potting protective glue.

[0034] In this embodiment, the space formed by the upper cavity 141 and the buckle hollow cavity 211 is a potting cavity; the lower cavity 142 is mainly a mounting cavity for the PCBA board 15; the remaining space inside the housing 11 is used to install the pressure detection core 13, the sealing ring 12, etc.

[0035] In this embodiment, the first split part 1 and the second split part 2 are manufactured as two independent components. The second split part 2 consists of a clip 21 fitted inside the cable 22. After the first split part 1 is assembled, the cable 22 of the second split part 2 is soldered to the pin header 152 of the first split part 1 for electrical connection, and then the clip 21 is clipped to the cover plate 14. After assembly, glue is poured into the upper cavity 141 and the hollow cavity 211 of the clip to complete the manufacturing of the pressure sensor of this embodiment.

[0036] This embodiment features a simple and reasonable structural design with strong stability. It independently separates the three cavities—the potting cavity, the PCBA board mounting cavity, and the pressure detection core mounting cavity—ensuring no interference between them. This results in stable electrical performance, low glue consumption, easy assembly and manufacturing, low production costs, and strong practicality.

[0037] Example 2

[0038] Based on Embodiment 1, this embodiment continues to describe in detail the technical features involved therein and the functions and roles of these technical features in this utility model, so as to help those skilled in the art to fully understand the technical solution of this utility model and reproduce it.

[0039] like Figures 1 to 8 A pressure sensor includes a first split part 1 and a second split part 2;

[0040] The first split part 1 includes a housing 11 with a pressure interface fixedly attached. A sealing ring 12, a pressure detection core 13, and a cover plate 14 with an upper cavity 141 and a lower cavity 142 are installed sequentially from bottom to top in the cavity of the housing 11. The upper cavity 141 and the lower cavity 142 are two independent cavities that do not communicate with each other. Specifically, the cover plate 14 has a hollow structure, and a partition 143 divides the hollow cavity of the cover plate 14 into the upper cavity 141 and the lower cavity 142. The lower cavity 142 houses a PCBA board 15 electrically connected to the pressure sensing core 13. A pin header 152 extending towards the opening 145 of the cover plate 14 is electrically connected to the PCBA board 15, with one end of the pin header 152 away from the PCBA board 15 protruding from the end face of the opening 145 of the cover plate 14. The pin header 152 penetrates the partition plate 143, and a sealant is applied at the contact point between the pin header 152 and the partition plate 143. Specifically, before applying the potting compound, the gap between the pin header 152 and the partition plate 143 is pre-sealed with sealant to prevent the potting compound from leaking into the lower cavity 142.

[0041] The second split part 2 includes a cable 22 electrically connected to the pin header 152 and a snap fastener 21 detachably fixed to the cover plate 14, the snap fastener 21 being in sealed contact with the cover plate 14; the snap fastener hollow cavity 211 of the snap fastener 21 is connected to the upper cavity 141, and the snap fastener hollow cavity 211 and the upper cavity 141 form a potting cavity for potting protective adhesive. The connector 151 of the pin header 152, which is soldered to the PCBA board 15, maintains an electrical connection with the PCBA board 15.

[0042] In this embodiment, the end face of the buckle 21 opposite to the cover plate 14 has an installation groove that matches the opening end 145 of the cover plate 14; the installation groove is fitted with a buckle sealing ring, or the installation groove is coated with a sealant for sealing. Both sealing methods can achieve an effective sealing effect. The buckle 21 has buckle plates 215 with buckle holes 214 on both sides; the cover plate 14 has protrusions 144 that match the buckle holes 214. Assembly is convenient and quick, and manufacturing is easy. In this embodiment, the pressure interface is a cylindrical connector pressure interface 17, or... Figure 8 The copper tube pressure interface 16 is shown.

[0043] In summary, this is merely a preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model. All equivalent variations and modifications made in accordance with the shape, structure, features and spirit of the claims of the present utility model should be included within the scope of the claims of the present utility model.

Claims

1. A pressure sensor, characterized in that: It includes a first sub-part (1) and a second sub-part (2); The first split part (1) includes a housing (11) with a pressure interface fixedly attached. A sealing ring (12), a pressure detection core (13), and a cover plate (14) with an upper cavity (141) and a lower cavity (142) are installed in the cavity of the housing (11) from bottom to top. The upper cavity (141) and the lower cavity (142) are two independent cavities that are not connected. The lower cavity (142) contains a PCBA board (15) that is electrically connected to the pressure detection core (13). A pin header (152) is electrically connected to the PCBA board (15) and extends toward the opening end (145) of the cover plate (14). The end of the pin header (152) away from the PCBA board (15) protrudes from the end face of the opening end (145) of the cover plate (14). The second split part (2) includes a cable (22) electrically connected to the pin header (152) and a buckle (21) detachably fixed to the cover plate (14), wherein the buckle (21) is in sealed contact with the cover plate (14); the buckle hollow cavity (211) of the buckle (21) is connected to the upper cavity (141), and the buckle hollow cavity (211) and the upper cavity (141) constitute a potting cavity for potting protective glue.

2. A pressure sensor according to claim 1, characterized in that: The cover plate (14) has a hollow structure, and the partition plate (143) divides the hollow cavity of the cover plate (14) into the upper cavity (141) and the lower cavity (142).

3. A pressure sensor according to claim 2, characterized in that: The pin header (152) passes through the partition (143), and the contact point between the pin header (152) and the partition (143) is sealed with adhesive.

4. A pressure sensor according to claim 1, characterized in that: The pin header (152) is electrically connected to the connector (151) on the PCBA board (15) via soldering.

5. A pressure sensor according to claim 1, characterized in that: The buckle (21) has an installation groove on the end face opposite to the cover plate (14) that is adapted to the opening end (145) of the cover plate (14); the installation groove is embedded with a buckle sealing ring, or the installation groove is coated with a sealant that has a sealing effect.

6. A pressure sensor according to claim 1, characterized in that: The buckle (21) has buckle plates (215) with buckle holes (214) on both sides; the cover plate (14) has protrusions (144) that are adapted to the buckle holes (214).

7. A pressure sensor according to claim 1, characterized in that: The pressure interface is a copper tube pressure interface (16) or a cylindrical connector pressure interface (17).

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