Vacuum degree pressure sensor

Abstract

The invention discloses a vacuum degree pressure sensor, and the sensor comprises a housing which is provided with an installation cavity; a first tube; a pressure measuring assembly; a longitudinally extending second tube combined to the housing to enclose a valve chamber; the valve element is arranged in the valve chamber so as to only allow the fluid medium to be detected to be discharged from the interior of the first pipe to the interior of the second pipe in a one-way manner, and comprises a valve plate and a guide column; the valve plate can seal the communicating hole towards one side of the longitudinal far end; the guide column is formed by integrally extending the valve plate towards one side of the longitudinal far end; the guide post can be connected to the second pipe in a longitudinal sliding manner; the second pipe is provided with a limiting part capable of stopping the valve element towards one side of the longitudinal far end; according to the one-way valve, the valve plate and the guide column are designed into an integrally-formed valve element, so that the internal structure of the one-way valve is simplified, the number of independent parts is effectively reduced, the material cost and the machining complexity are reduced, the assembly process is simplified, and the production efficiency and the product consistency are improved.

Description

Technical Field

[0001] This invention belongs to the field of sensor technology, specifically a vacuum pressure sensor. Background Technology

[0002] Vacuum boosters provide additional braking assistance during braking by utilizing the pressure difference across the diaphragm of the gas chamber. The low-pressure chamber of the vacuum booster requires monitoring of its vacuum level to ensure effective braking.

[0003] The existing structure of brake booster vacuum sensors is as follows: Figure 1 As shown, it includes a housing 01, which has a first port 02 connected to the low-pressure chamber of a vacuum booster and a second port 03 connected to a negative pressure source. A one-way valve 04 is provided in the second port 03 to ensure that gas can only flow from the low-pressure chamber of the vacuum booster to the negative pressure source. The need to install and guide the one-way valve 04 leads to a complex structure, high molding costs, and an increase in the axial dimension of the sensor.

[0004] The statements in this section are provided only as background information in relation to this application and may not constitute prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a vacuum pressure sensor to solve at least one of the above-mentioned technical problems.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A vacuum pressure sensor, comprising: A housing with a mounting cavity; The first tube used to introduce the fluid medium to be tested; The pressure measuring component disposed within the mounting cavity is sealed to the interior of the first tube to obtain the pressure of the fluid medium to be measured; A longitudinally extending second tube is assembled to the housing to form a valve chamber, and its longitudinal distal end is connected to the interior of the first tube via the valve chamber and a connecting hole in sequence. A valve element disposed in the valve chamber to allow only the fluid medium to be tested to be discharged unidirectionally from the inside of the first tube to the inside of the second tube includes a valve plate that can close the communication hole toward the longitudinal distal end and a guide post integrally formed by the valve plate toward the longitudinal distal end, the guide post being longitudinally slidably connected to the second tube. The second tube has a limiting portion that can block the valve element toward the longitudinal distal end.

[0007] Preferably, the second tube has a plate at one end near the housing, and the plate and the housing together form the valve chamber.

[0008] Preferably, the plate protrudes toward the housing to form a valve wall, and the valve wall is sealed to the housing.

[0009] Preferably, the plate has a guide portion so that the guide post can be slidably connected to the second tube in the longitudinal direction.

[0010] Preferably, the guide portion is a guide hole formed on the plate along the axial direction of the second tube.

[0011] Preferably, the second pipe and the valve chamber have a first ventilated portion that connects the two.

[0012] Preferably, the first ventilated portion includes a plurality of through vent holes formed in the plate.

[0013] Preferably, the first ventilated portion includes a ventilated channel formed on the guide post, with one end of the ventilated channel located on the end face of the guide post facing the second pipe, and the other end located on the outer peripheral surface of the guide post inside the valve chamber.

[0014] Preferably, the limiting portion includes a stop surface formed on the plate, the outer diameter of the guide post near the valve plate is enlarged to form a support portion, the end of the support portion near the stop surface forms a support surface, and the stop surface can stop on the support surface towards the longitudinal distal end.

[0015] Preferably, the limiting portion includes a supporting flange formed by the plate protruding toward the housing, the supporting flange being able to block the valve plate toward the longitudinally distal end; A mating surface is formed on the outer side of the housing, located inside the valve chamber, and a communicating hole is provided on the mating surface to connect the valve chamber with the inner cavity of the first pipe; The support flange has a second ventilated portion that connects from the inside of the support flange to the mating surface.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention simplifies the internal structure of the one-way valve by designing the valve plate and guide post as an integrally formed valve element, effectively reducing the number of independent parts, lowering material costs and processing complexity, simplifying the assembly process, and improving production efficiency and product consistency.

[0017] 2. By integrally molding the valve plate and the guide post, the guide structure of the valve plate can be set inside the second tube, which is conducive to miniaturization and compactness of the overall sensor structure.

[0018] 3. The guide post slides directly with the guide part on the second pipe, which realizes the precise guidance of the valve element, ensuring that the valve plate can be accurately aligned with and seal the connecting hole during the opening and closing process, thus improving the working reliability of the check valve.

[0019] 4. By setting a limit part, the range of movement of the valve plate can be limited, preventing the valve plate from blocking the opening of the second pipe.

[0020] 5. By setting a first vent on the second tube, when the valve plate is opened, the fluid medium to be tested can be discharged unidirectionally from the inside of the first tube to the inside of the second tube. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a known automotive brake booster vacuum sensor. Figure 2 This is a schematic diagram of the structure of the vacuum pressure sensor valve plate when it is closed in this embodiment; Figure 3 This is a schematic diagram of the structure of the vacuum pressure sensor valve plate when it is open in this embodiment; Figure 4 This is a perspective view of the second tube in this embodiment; Figure 5 This is a three-dimensional sectional view of the second tube in this embodiment; Figure 6 This is a schematic diagram of the vacuum pressure sensor structure of another preferred embodiment in this example; In the figure: 1. Housing; 11. Mounting cavity; 12. Mating surface; 121. Connecting hole; 2. First tube; 3. Pressure measuring assembly; 4. Second tube; 41. Plate; 411. Valve wall; 412. Guide hole; 413. Stop surface; 414. Support flange; 42. Vent hole; 5. Valve chamber; 6. Valve element; 61. Valve plate; 62. Guide post; 621. Support part; 6211. Support surface. Detailed Implementation

[0022] The technical solution of this application will now be clearly and completely described with reference to the accompanying drawings. The following embodiments are exemplary and are only used to explain this application, and should not be construed as limiting this application. In the following description, the same reference numerals are used to denote the same or equivalent elements, and repeated descriptions are omitted.

[0023] In the description of this application, it should be understood that the terms "upper," "lower," "inner," "outer," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the equipment or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the prepositions "first," "second," and "third," etc., are only used for the purpose of distinguishing the modified objects, and should not be construed as indicating or implying relative importance.

[0024] Furthermore, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections 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 application based on the specific circumstances.

[0025] It should also be further understood that the term "and / or" as used in this application specification and the corresponding claims refers to any combination of one or more of the listed items and all possible combinations.

[0026] like Figure 1-5 As shown, this embodiment provides a vacuum pressure sensor, including a housing 1, a first tube 2, a pressure measuring component 3, a second tube 4, and a valve element 6.

[0027] The housing 1 defines a mounting cavity 11 for accommodating the pressure measuring assembly 3. The housing 1 is typically made of metal or high-strength engineering plastic to ensure sufficient structural strength and sealing performance. On one side wall of the housing 1 (e.g....) Figure 2 The outer surface of the left side wall shown in the figure has a mating surface 12, which is a relatively flat area for mating with the valve element 6 (controlling the one-way communication between the first pipe 2 and the second pipe 4). A communication hole 121 is provided on the mating surface 12 of the housing 1 for communication between the valve chamber 5 and the inner cavity of the first pipe 2.

[0028] The first tube 2 is fixedly connected to the housing 1 and communicates with its interior. The first tube 2 serves as the inlet channel for the fluid medium to be measured, and its distal end (i.e., the end furthest from the housing 1) is used to connect to the device to be measured. The fluid medium to be measured (which can be gas or liquid) flows into the sensor through the first tube 2. The inner cavity of the first tube 2 is connected to the mounting cavity 11 of the housing 1 through a suitable flow channel so that the fluid medium to be measured can be introduced into the pressure measuring assembly 3.

[0029] The pressure measuring component 3 is disposed within the mounting cavity 11 of the housing 1. The core function of the pressure measuring component 3 is to convert the pressure of the fluid medium into an electrical signal. It may include a pressure-sensitive element and related processing circuitry (not shown in detail in the figure). The pressure measuring component 3 is in fluid communication with the inside of the first tube 2 through a sealed means (e.g., through a pressure inlet, sealant, or O-ring), thereby enabling it to sense the pressure change of the medium to be measured in the first tube 2 in real time and convert the pressure signal into a corresponding electrical signal output.

[0030] The second pipe 4 is along the longitudinal direction (i.e.) Figure 2 The second tube (extending laterally) is typically tubular. It is assembled to the outer wall of the housing 1. Specifically, the end of the second tube 4 near the housing 1 has a plate 41. This plate 41 and the outer wall of the housing 1 together form a valve chamber 5, and the mating surface 12 formed on the outer side of the housing 1 is located within the valve chamber 5.

[0031] In this embodiment, to achieve a good seal, plate 41 protrudes towards housing 1 to form an annular valve wall 411. During assembly, the end face of valve wall 411 is sealed to the outer wall of housing 1, thereby reliably forming valve chamber 5. The longitudinal distal end of the second pipe 4 (i.e. Figure 2 The opposite end of the middle plate 41 (usually an open end) is used to connect to the outside, such as the atmosphere, a recovery device, or a next-stage processing system. Therefore, the inner cavity of the second pipe 4 passes through the valve chamber 5 and the connecting hole 121 opened on the mating surface 12 of the housing 1 in sequence, and finally communicates with the interior of the first pipe 2, forming a fluid path from the first pipe 2 through the connecting hole 121 and the valve chamber 5 to the second pipe 4.

[0032] Valve element 6 is disposed within valve chamber 5. The core function of valve element 6 is to act as a one-way valve, allowing fluid to flow unidirectionally from the interior of first pipe 2 to the interior of second pipe 4, while preventing reverse flow. Valve element 6 includes a valve plate 61 and a guide post 62, both integrally formed. The valve plate 61 and guide post 62 are single parts manufactured from the same material through processes such as injection molding, machining, or compression molding, with no assembly interface between them. The shape and size of valve plate 61 are designed to cover and seal the connecting hole 121 on the mating surface 12 of housing 1. Guide post 62 extends integrally from the center or a specific position of valve plate 61 longitudinally distally (i.e., toward the interior of second pipe 4), forming a columnar structure.

[0033] To enable the valve element 6 to move stably within the valve chamber 5 and to achieve accurate opening and closing of the valve plate 61 to the connecting hole 121, a guide portion is provided on the plate 41 of the second pipe 4. In this embodiment, the guide portion is specifically a guide hole 412 formed on the plate 41 along the axial direction (i.e., longitudinal direction) of the second pipe 4. The guide post 62 is slidably inserted into the guide hole 412. The inner wall of the guide hole 412 guides and constrains the outer circumferential surface of the guide post 62, so that the valve element 6 can only move along the axial direction. This guiding method has a simple structure and high guiding accuracy.

[0034] To achieve communication between the second pipe 4 and the valve chamber 5, a first ventilated section is provided between the second pipe 4 and the valve chamber 5 to connect them. In this embodiment, as shown... Figure 4 and Figure 5 As shown, the first ventilated portion includes a plurality of through vent holes 42 formed on the plate 41. These vent holes 42 are distributed around the guide hole 412. In this embodiment, for ease of processing, the opening direction of the vent holes 42 can be consistent with the opening direction of the guide hole 412, and the vent holes 42 can also communicate with the guide hole 412. As another preferred embodiment, the first ventilated portion can also be a ventilated channel formed on the guide post 62, with one end of the ventilated channel located on the end face of the guide post 62 facing the second tube 4, and the other end located on the outer peripheral surface of the guide post 62 inside the valve chamber 5, so that the inner cavity of the second tube 4 can communicate with the valve chamber 5 through this ventilated channel.

[0035] To prevent the valve plate 61 from covering the vent hole 42, in this embodiment, combined with... Figure 2 , Figure 3 and Figure 4The second pipe 4 has a limiting portion that can stop the valve element 6 towards its longitudinal distal end. The limiting portion includes a stop surface 413 formed on the plate 41 and facing the valve chamber 5. The vent hole 42 is at least partially located outside the stop surface. Correspondingly, at the end of the guide post 62 near the valve plate 61, its outer diameter is enlarged to form an annular support portion 621. The end of the support portion 621 near the stop surface 413 forms a support surface 6211. When the valve plate 61 is open, the support surface 6211 can abut against the stop surface 413 of the plate 41, thereby being mechanically stopped and limiting its maximum stroke, thus preventing the valve plate 61 from covering the vent hole 42. This limiting structure is direct, reliable, and easy to manufacture. When the valve plate 61 is closed, the valve plate 61 abuts against the mating surface 12, and the valve plate 61 can block the communicating hole 121 opened on the mating surface 12, making it difficult for the first pipe 2 to communicate with the valve chamber 5. When the valve plate 61 is opened, the valve plate 61 does not block the connecting hole 121 opened on the mating surface 12. The first pipe 2 can communicate with the valve chamber 5 through the connecting hole 121, and the support surface 6211 can abut against the stop surface 413 of the plate 41. The fluid medium to be measured can enter the valve chamber 5 through the first pipe 2 through the connecting hole 121, and then enter the second pipe 4 through the first venting part from the valve chamber 5.

[0036] As another preferred embodiment of this solution, such as Figure 6 As shown, the limiting part may also include an annular support flange 414 formed by the plate 41 protruding toward the housing 1 (i.e., toward the valve chamber 5). When the valve plate 61 is opened, the end face of the support flange 414 can stop the valve plate 61 toward the longitudinally distal side (the side of the valve plate 61 closer to the second tube 4). To ensure the communication between the inner cavity of the first pipe 2, the valve chamber 5, and the inner cavity of the second pipe 4 under this structure, a second venting portion can be provided on the supporting flange 414, such as multiple small holes or grooves distributed circumferentially. This allows gas to flow from the inside of the supporting flange 414 through the second venting portion to the outside of the supporting flange 414, and then to the mating surface 12 and the connecting hole 121 provided on the mating surface 12. When the valve plate 61 is opened, the end face of the supporting flange 414 can block the valve plate 61 from approaching the second pipe 4. The fluid medium to be measured can enter the valve chamber 5 from the first pipe 2 through the connecting hole 121, then enter the inner side of the supporting flange 414 from the valve chamber 5 through the second venting portion, and then enter the inner cavity of the second pipe 4 from the inner side of the supporting flange 414 through the first venting portion.

[0037] This invention replaces the traditional multi-part assembled one-way valve with an integrally molded valve element 6 (valve plate 61 and guide post 62), reducing the number of parts. The sliding fit between the guide post 62 and the guide hole 412 on the plate 41 achieves precise guidance. The vent hole 42 facilitates communication between the inner cavity of the second tube 4 and the valve chamber 5. The engagement between the stop surface 413 and the support part 621 ensures reliable positioning. The overall design is simple and compact, which helps reduce the axial dimension of the vacuum pressure sensor (i.e., the length direction of the second tube 4), while improving assembly efficiency and product reliability.

[0038] It should be noted that although the present invention has been disclosed above with specific embodiments, the above embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A vacuum pressure sensor, characterized in that, include: A housing with a mounting cavity; The first tube used to introduce the fluid medium to be tested; The pressure measuring component disposed within the mounting cavity is sealed to the interior of the first tube to obtain the pressure of the fluid medium to be measured; A longitudinally extending second tube is assembled to the housing to form a valve chamber, and its longitudinal distal end is connected to the interior of the first tube via the valve chamber and a connecting hole in sequence. A valve element disposed in the valve chamber to allow only the fluid medium to be tested to be discharged unidirectionally from the inside of the first tube to the inside of the second tube includes a valve plate that can close the communication hole toward the longitudinal distal end and a guide post integrally formed by the valve plate toward the longitudinal distal end, the guide post being longitudinally slidably connected to the second tube. The second tube has a limiting portion that can block the valve element toward the longitudinal distal end.

2. The vacuum pressure sensor as described in claim 1, characterized in that, The second tube has a plate at one end near the housing, and the plate and the housing together form the valve chamber.

3. The vacuum pressure sensor as described in claim 2, characterized in that, The plate protrudes towards the housing to form a valve wall, and the valve wall is sealed to the housing.

4. The vacuum pressure sensor as described in claim 2, characterized in that, A guide portion is provided on the plate so that the guide post can be slidably connected to the second tube in the longitudinal direction.

5. The vacuum pressure sensor as described in claim 4, characterized in that, The guide portion is a guide hole formed on the plate along the axial direction of the second tube.

6. The vacuum pressure sensor as described in claim 2, characterized in that, The second pipe has a first ventilated section that connects the two valve chambers.

7. The vacuum pressure sensor as described in claim 6, characterized in that, The first ventilated portion includes a plurality of through vent holes formed in the plate.

8. The vacuum pressure sensor as described in claim 6, characterized in that, The first ventilated portion includes a ventilated channel formed on the guide post. One end of the ventilated channel is located on the end face of the guide post facing the second pipe, and the other end is located on the outer peripheral surface of the guide post inside the valve chamber.

9. The vacuum pressure sensor as described in claim 2, characterized in that, The limiting part includes a stop surface formed on the plate. The outer diameter of the guide post near the valve plate is enlarged to form a support part. The end of the support part near the stop surface forms a support surface. The stop surface can stop on the support surface towards the longitudinal distal end.

10. The vacuum pressure sensor as described in claim 2, characterized in that, The limiting portion includes a supporting flange formed by the plate protruding toward the housing, and the supporting flange can block the valve plate toward the longitudinal distal end side; A mating surface is formed on the outer side of the housing, located inside the valve chamber, and a communicating hole is provided on the mating surface to connect the valve chamber with the inner cavity of the first pipe; The support flange has a second ventilated portion that connects from the inside of the support flange to the mating surface.

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