Air pressure sensor

Abstract

The utility model discloses a baroceptor, relates to the technical field of sensors, and aims to solve the problem that the baroceptor cannot realize self-plugging, the baroceptor comprises an upper device, a lower device and a sensing element, the upper device and the lower device are both internally provided with mounting holes, and the sensing element is arranged in the mounting holes. The lower device comprises a plugging block, a vent hole is formed in the plugging block, an upper connecting cylinder is connected to the upper surface of the plugging block, the upper connecting cylinder is in threaded connection with the upper device, a movable rod is arranged in the vent hole in a penetrating mode, and the movable rod is connected with the upper device in a threaded mode. The bottom end of the movable rod is provided with a plug used for plugging the vent hole, and the top end of the movable rod abuts against the sensing element. A baffle is further arranged on the movable rod, a spring is arranged in the upper connecting cylinder, the movable rod is sleeved with the spring, the bottom end of the spring abuts against the plugging block, and the top end of the spring abuts against the baffle.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a barometric pressure sensor Background Art

[0002] A barometric pressure sensor is an instrument for measuring the absolute pressure of a gas, and is mainly applicable to the detection process related to gas pressure. Inside the barometric pressure sensor, a sensitive sensing element is used to collect barometric pressure signals. The pressure of the gas will cause a certain degree of deformation of the sensing element, and then the deformation of the sensing element will change the resistance value of the resistor, so as to realize the transmission of the collected barometric pressure information in the form of an electrical signal

[0003] Existing barometric pressure sensors are generally not suitable for continuous gas detection. Especially for high-pressure gases, long-term continuous monitoring is likely to increase the fatigue of the sensing element during use, and then reduce the service life of the sensing element. To solve the problem of continuous detection, generally, multiple barometric pressure sensors are installed on the pipeline or the gas source at the same time, and the continuous detection is ensured through the cyclic use of multiple barometric pressure sensors; and because the barometric pressure sensor cannot achieve the purpose of self-blocking, it generally needs to be used in cooperation with a valve during installation. That is, when the sensing element needs to be replaced or repaired, the valve is required to block the connection between the barometric pressure sensor and the pipeline or the gas source, and then the replacement is carried out. Cooperating with the valve will not only increase the use cost of the barometric pressure sensor, but also make the installation process of the barometric pressure sensor more complicated and troublesome Summary of the Utility Model

[0004] To solve the above problems, that is, the problem that the barometric pressure sensor cannot achieve self-blocking, the utility model provides a barometric pressure sensor, which includes an upper device, a lower device and a sensing element. Installation holes are provided in both the upper device and the lower device. Both ends of the sensing element are respectively arranged in the two installation holes and are abutted against the rabbet in the installation hole. The lower device includes a blocking block. A ventilation hole is provided at the center of the blocking block. The bottom end of the ventilation hole is arranged in a conical shape. An upper connecting cylinder is connected to the upper surface of the blocking block. The upper connecting cylinder is threadedly connected to the upper device. A movable rod passes through the ventilation hole. A plug adapted to the conical end of the ventilation hole is arranged at the bottom end of the movable rod. The top end of the movable rod abuts against the sensing element; a baffle is further arranged on the movable rod. A spring is arranged in the upper connecting cylinder. The spring is sleeved on the movable rod. The bottom end of the spring abuts against the blocking block, and the top end of the spring abuts against the baffle

[0005] A further setting of the utility model is that the bottom end of the ventilation hole is arranged in a conical shape, and the plug is also arranged in a conical shape adapted thereto

[0006] A further setting of the present utility model is that the plug is made of elastic rubber material.

[0007] A further setting of the present utility model is that two limiting rods are further arranged on the movable rod, the two limiting rods are symmetrically arranged with respect to the movable rod, the limiting rods are arranged above the baffle, and two limiting grooves are vertically formed on the inner wall of the upper connecting cylinder, and one ends of the two limiting rods departing from the movable rod are placed in the limiting grooves.

[0008] A further setting of the present utility model is that a pressing plate is arranged at the top end of the movable rod, and the pressing plate abuts against the sensing element; a positioning notch adapted to the pressing plate is formed on the stop of the mounting hole arranged in the lower device.

[0009] A further setting of the present utility model is that a resisting plate is arranged at the bottom end of the sensing element corresponding to the pressing plate.

[0010] A further setting of the present utility model is that the lower surface of the blocking block is connected with a lower connecting cylinder, an external thread is arranged on the lower connecting cylinder for connecting a pipeline to be measured, and the plug is arranged in the lower connecting cylinder.

[0011] A further setting of the present utility model is that the mounting hole is arranged as a hexagonal hole, the sensing element is arranged as a hexagonal prism, an electrical connection hole is formed at the top end of the sensing element, a mounting plate is rotatably connected in the upper device, a contact point adapted to the electrical connection hole is arranged on the lower surface of the mounting plate, and the contact point is connected with an external system through a wire for transmitting an electrical signal.

[0012] The beneficial effects of the present utility model are as follows:

[0013] 1. By threadedly connecting the upper device and the lower device, the purpose of adjusting the distance between the upper device and the lower device can be achieved, and further the purpose of adjusting the distance between the two mounting holes can be achieved. After the distance between the two mounting holes is enlarged, under the action of the elastic force of the spring, the movable rod will push the sensing element to move upward together, and when the movable rod moves upward, the plug can be clamped to the conical end of the ventilation hole, thereby achieving the purpose of blocking the ventilation hole, realizing self-blocking, and at this time, the replacement or repair of the sensing element can also be completed.

[0014] 2. Through the cooperation of the limiting groove and the limiting rod, the movement of the movable rod can be made more stable and convenient, and the problem of deviation can be avoided.

[0015] 3. By setting the installation hole as a hexagonal hole and the sensing element as a hexagonal prism, it can be avoided that the sensing element rotates along with the rotation when screwing on or off the device. And connecting the mounting plate to the upper device rotatably can also avoid the mounting plate rotating along with the rotation when screwing on the upper device, further ensuring that the contact can be accurately inserted into the electrical connection hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The structural schematic diagram of the present invention is shown.

[0017] Figure 2 The sectional view taken along the line A - A is shown.

[0018] Figure 3 The partial sectional view of the present invention is shown.

[0019] Figure 4 The partial sectional view of the lower device is shown.

[0020] Figure 5 The structural schematic diagram of the movable rod is shown.

[0021] Figure 6 The structural schematic of the sensing element is shown Figure 1 .

[0022] Figure 7 The structural schematic of the sensing element is shown Figure 2 .

[0023] Figure 8 The partial sectional view of the upper device is shown.

[0024] Reference numerals: 1, upper device; 11, mounting plate; 111, contact; 2, lower device; 21, blocking block; 211, ventilation hole; 22, upper connecting cylinder; 221, limiting groove; 23, lower connecting cylinder; 3, sensing element; 31, abutting plate; 32, electrical connection hole; 4, installation hole; 5, movable rod; 51, plug; 52, baffle; 53, spring; 54, limiting rod; 55, pressing plate; 6, positioning notch. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention.

[0026] The utility model provides a pressure sensor, which comprises an upper device 1, a lower device 2 and a sensing element 3. The upper device 1 is threadedly connected to the lower device 2. Installation holes 4 are formed inside both the upper device 1 and the lower device 2. Both ends of the sensing element 3 are respectively installed in the two installation holes 4, and both ends of the sensing element 3 are abutted against the shoulders in the two installation holes 4, so as to clamp the sensing element 3 through the two installation holes 4.

[0027] The lower device 2 comprises a prismatic plugging block 21. A vent hole 211 is formed at the center of the plugging block 21. An upper connecting cylinder 22 is welded to the upper surface of the plugging block 21, and the upper connecting cylinder 22 is communicated with the vent hole 211. The bottom end of the upper connecting cylinder 22 is welded to the plugging block 21, and an external thread is formed at the top end of the upper connecting cylinder 22 for threaded connection with the upper device 1. One of the installation holes 4 is arranged inside the upper connecting cylinder 22.

[0028] A movable rod 5 is coaxially inserted into the vent hole 211. Both ends of the movable rod 5 are respectively arranged on both sides of the vent hole 211. The cross-sectional diameter of the movable rod 5 is set to be smaller than the cross-sectional diameter of the vent hole 211, so as to ensure that the movable rod 5 does not affect the gas flow inside the vent hole 211. A plug 51 adapted to the vent hole 211 is fixedly connected to the bottom end of the movable rod 5, and the plug 51 is used for plugging the vent hole 211; the top end of the movable rod 5 abuts against the sensing element 3. A baffle 52 is also fixedly connected to the side wall of the movable rod 5. The baffle 52 is circular. The baffle 52 is arranged inside the upper connecting cylinder 22, and the diameter of the baffle 52 is set to be smaller than the inner diameter of the upper connecting cylinder 22, so as to prevent the baffle 52 from blocking the gas flow inside the upper connecting cylinder 22. A spring 53 is also arranged inside the upper connecting cylinder 22. The spring 53 is sleeved on the movable rod 5, and the bottom end of the spring 53 abuts against the plugging block 21, and the top end of the spring 53 abuts against the baffle 52.

[0029] The bottom end of the vent hole 211 is formed into a conical shape, and the plug 51 is also formed into a conical shape adapted thereto, so that a better plugging effect can be achieved, and at the same time, a certain limiting effect can be exerted on the movement of the movable rod 5. The plug 51 is made of an elastic rubber material to further improve the sealing performance during plugging.

[0030] Two limiting rods 54 are also fixedly connected to the side wall of the movable rod 5. The limiting rods 54 are perpendicular to the movable rod 5. The two limiting rods 54 are symmetrically arranged with respect to the movable rod 5. The limiting rods 54 are arranged inside the upper connecting cylinder 22, and the limiting rods 54 are located above the baffle 52. Two limiting grooves 221 are vertically formed on the inner wall of the upper connecting cylinder 22. The two limiting grooves 221 are also symmetrically arranged with respect to the movable rod 5. The ends of the two limiting rods 54 departing from the movable rod 5 are respectively arranged inside the two limiting grooves 221, so as to limit the movement direction of the movable rod 5 through the cooperation between the limiting rods 54 and the limiting grooves 221.

[0031] A pressing plate 55 is also fixedly connected to the top end of the movable rod 5. The pressing plate 55 is used to abut against the sensing element 3. A positioning notch 6 adapted to the pressing plate 55 is provided on the shoulder of the mounting hole 4 arranged in the lower device 2. That is, when the sensing element 3 can press the pressing plate 55 tightly into the positioning notch 6, the limiting and pressing of the movable rod 5 can be further realized.

[0032] Abutting plate 31 corresponding to the pressing plate 55 is also arranged at the bottom end of the sensing element 3. The abutting plate 31 is fixedly connected to the bottom of the sensing element 3. The abutting plate 31 is used to contact the pressing plate 55 to realize pressing. In this way, it can be avoided that the pressing plate 55 directly contacts the sensing element 3, and further avoid that the pressing plate 55 presses the sensitive unit in the sensing element 3, so as to cause damage to it.

[0033] A lower connecting cylinder 23 is welded to the lower surface of the plugging block 21. External threads are provided on the lower connecting cylinder 23 for threaded connection to the pipeline to be measured, so as to realize the connection between the air pressure sensor and the pipeline to be measured. A plug 51 is arranged in the lower connecting cylinder 23.

[0034] The mounting hole 4 is set as a hexagonal hole, and the sensing element 3 is set as a hexagonal prism adapted to it. Two electrical connection holes 32 are provided at the top end of the sensing element 3. A mounting plate 11 is rotatably connected in the upper device 1. The mounting plate 11 is rotatably connected to the inner wall of the upper device 1. The mounting plate 11 is arranged above the mounting hole 4. Two contacts 111 are mounted on the lower surface of the mounting plate 11. The contacts 111 are adapted to the electrical connection holes 32 so that the contacts 111 can be inserted into the electrical connection holes 32. The output ends of the contacts 111 are connected to an external system through wires for transmitting electrical signals. That is, when the sensing element 3 detects an air pressure signal, it will convert the air pressure signal into an electrical signal, and then transmit the electrical signal through the contacts 111 and the wires.

[0035] During detection, by screwing the upper device 1 in the direction of the lower device 2, the distance between the two mounting holes 4 is reduced until the two mounting holes 4 clamp the sensing element 3. Since the lower device 2 is connected to the pipeline to be measured through the lower connecting cylinder 23, when the upper device 1 is screwed, the lower device 2 remains fixed. Therefore, the upper device 1 can push the sensing element 3 to move in the direction of the lower device 2 together, and then push the movable rod 5 to drive the plug 51 to move away from the ventilation hole 211. The baffle 52 compresses the spring 53 so that the plug 51 is separated from the ventilation hole 211. At this time, the pipeline to be measured can be communicated with the sensing element 3 through the air hole, so as to realize the purpose of detecting the air pressure in the pipeline to be measured.

[0036] When it is necessary to stop the detection or when the sensing element 3 needs to be replaced or repaired, by screwing the upper device 1 in the direction away from the lower device 2, the upper device 1 is screwed so that the distance between the two mounting holes 4 increases. As a result, the two mounting holes 4 can no longer clamp the sensing element 3. Since the lower device 2 is connected to the pipeline to be measured through the lower connecting cylinder 23, under the elastic force of the spring 53, the spring 53 can push the movable rod 5 to move in the direction of the upper device 1. During the process of continuously screwing the upper device 1, the distance between the two mounting holes 4 becomes larger and larger, and thus the movable stroke of the sensing element 3 is also larger. When the movable rod 5 drives the plug 51 to move to cooperate with the tapered end of the ventilation hole 211, the movable rod 5 will no longer move. At this time, the ventilation hole 211 can be blocked by the plug 51, disconnecting the connection between the pipeline to be measured and the sensing element 3, and thus the purpose of replacing or repairing the sensing element 3 can be achieved.

[0037] It should be noted that since the mounting plate 11 is rotatably connected to the upper device 1, when the contact 111 is connected to the electrical connection hole 32, screwing the upper device 1 will not drive the mounting plate 11 to rotate accordingly.

[0038] In summary, by threadedly connecting the upper device 1 and the lower device 2, the present utility model can achieve the purpose of adjusting the distance between the upper device 1 and the lower device 2, and further achieve the purpose of adjusting the distance between the two mounting holes 4. After the distance between the two mounting holes 4 is enlarged, under the elastic force of the spring 53, the movable rod 5 will push the sensing element 3 to move upward together. When the movable rod 5 moves upward, the plug 51 can be clamped to the tapered end of the ventilation hole, thereby achieving the purpose of blocking the ventilation hole 211 and realizing self-blocking. And at this time, the replacement or repair of the sensing element 3 can also be completed. Through the cooperation of the limiting groove 221 and the limiting rod 54, the movement of the movable rod 5 can be made more stable and convenient, avoiding the problem of deviation. By setting the mounting hole 4 as a hexagonal hole and setting the sensing element 3 as a hexagonal prism, it can be avoided that the sensing element 3 will rotate accordingly when the upper device 1 or the lower device 2 is screwed. And by rotatably connecting the mounting plate 11 and the upper device 1, it can also be avoided that the mounting plate 11 will rotate accordingly when the upper device 1 is screwed, further ensuring that the contact 111 can be accurately inserted into the electrical connection hole 32.

[0039] Although the present utility model has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present utility model. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present utility model is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

[0040] In the description of the present utility model, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0041] In addition, it should be noted that in the description of the present utility model, unless otherwise clearly specified and defined, the terms "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0042] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, so that a process, article, or apparatus / device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or also includes elements inherent in these processes, articles, or apparatus / device.

[0043] So far, the technical solution of the present utility model has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present utility model is obviously not limited to these specific embodiments. Without departing from the principle of the present utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present utility model.

Claims

1. A pressure sensor, characterized in that: The invention comprises an upper device (1), a lower device (2) and a sensor element (3), wherein the upper device (1) and the lower device (2) are both provided with mounting holes (4), the two ends of the sensor element are respectively arranged in the two mounting holes (4) and abut against the stoppers in the mounting holes (4), the lower device (2) comprises a blocking block (21), a vent hole (211) is provided at the center of the blocking block (21), an upper connecting tube (22) is connected to the upper surface of the blocking block (21), and the upper connecting tube (22) is threadedly connected to the upper device (1). A movable rod (5) is provided in the vent hole (211), and a plug (51) for blocking the vent hole (211) is provided at the bottom end of the movable rod (5), and the top end of the movable rod (5) is against the sensor element (3); a baffle (52) is also provided on the movable rod (5), and a spring (53) is provided in the upper connecting tube (22), and the spring (53) is sleeved on the movable rod (5), and the bottom end of the spring (53) is against the blocking block (21), and the top end of the spring (53) is against the baffle (52).

2. The pressure sensor according to claim 1, wherein: The bottom end of the vent hole (211) is configured to be conical, and the plug (51) is also configured to be conical to match it.

3. The pressure sensor according to claim 2, wherein: The plug (51) is made of elastic rubber material.

4. The pressure sensor according to claim 1, wherein: Two limiting rods (54) are also provided on the movable rod (5), and the two limiting rods (54) are symmetrically arranged about the movable rod (5). The limiting rods (54) are arranged above the baffle (52). Two limiting grooves (221) are vertically opened on the inner wall of the upper connecting tube (22), and one end of the two limiting rods (54) facing away from the movable rod (5) is placed in the limiting groove (221).

5. The air pressure sensor according to claim 1, characterized in that: A pressure plate (55) is provided at the top end of the movable rod (5), and the pressure plate (55) abuts against the sensor element; a positioning notch (6) adapted to the pressure plate (55) is provided on the stop of the mounting hole (4) provided in the lower device (2).

6. The air pressure sensor according to claim 5, wherein: The bottom end of the sensing element (3) is provided with a stop plate (31) corresponding to the pressure plate (55).

7. The air pressure sensor according to claim 1, wherein: The lower surface of the blocking block (21) is connected to a lower connecting tube (23), and the lower connecting tube (23) is provided with an external thread for connecting to a pipeline to be tested. The plug (51) is arranged in the lower connecting tube (23).

8. The air pressure sensor according to claim 1, wherein: The mounting hole (4) is configured as a hexagonal hole, the sensing element (3) is configured as a hexagonal prism, an electrical connection hole (32) is provided at the top of the sensing element (3), a mounting plate (11) is rotatably connected to the upper device (1), a contact (111) adapted to the electrical connection hole (32) is provided on the lower surface of the mounting plate (11), and the contact (111) is connected to an external system via a wire for transmitting electrical signals.

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