Capacitive vacuum pressure sensor

Abstract

The utility model belongs to the technical field of pressure sensors, and particularly relates to a capacitive vacuum pressure sensor which comprises a gauge outfit, the lower end of the gauge outfit is fixedly connected with a fixing pipe, the inside of the fixing pipe is rotatably connected with a limiting block, the lower end of the limiting block is fixedly connected with a limiting sleeve, and the lower end of the limiting sleeve is in contact with a valve body. And the upper end of the valve body is fixedly connected with a connecting pipe. By arranging the limiting block, the limiting sleeve and other components, when the connecting pipe and the fixing pipe are connected in an inserted mode, the limiting sleeve is rotated, the limiting sleeve and the connecting pipe move in a threaded mode, and therefore the limiting sleeve plays a role in limiting the connecting pipe, and the connecting pipe and the fixing pipe can be kept stable after being connected. The problem that when a capacitive vacuum pressure sensor is used, connection between a connecting pipe of a valve body and a fixing pipe of a meter head is unstable, and the phenomenon of leakage at the connecting position is likely to happen is solved.

Description

Technical Field

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

[0002] A capacitive vacuum pressure sensor is a sensor for measuring a vacuum state (pressure below atmospheric pressure). It mainly reflects changes in pressure through changes in capacitance and is suitable for various industrial and scientific research fields, especially in application scenarios requiring high precision and high stability. According to the invention disclosed in the authorization announcement number CN114323363B, a capacitive vacuum pressure sensor includes a shell with an accommodating cavity, a pressure-sensitive diaphragm and a fixed electrode. The pressure-sensitive diaphragm and the fixed electrode are both cylindrical in shape. The pressure-sensitive diaphragm is arranged in the accommodating cavity, and the two ends of the pressure-sensitive diaphragm are respectively connected to the top and bottom of the accommodating cavity. The pressure-sensitive diaphragm divides the accommodating cavity into a measuring cavity and a reference cavity. The fixed electrode is arranged in the reference cavity. The fixed electrode and the pressure-sensitive diaphragm form a variable capacitor.

[0003] However, when the capacitive vacuum pressure sensor is in use, the connection between the connecting pipe of the valve body and the fixed pipe of the meter head is unstable, which can easily lead to leakage at the connection. Utility Model Content

[0004] The purpose of the utility model is to provide a capacitive vacuum pressure sensor, which solves the problem that the connection between the connecting pipe of the valve body and the fixed pipe of the meter head of the capacitive vacuum pressure sensor is unstable when in use, which easily leads to leakage at the connection.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a capacitive vacuum pressure sensor, comprising a meter head, the lower end of the meter head is fixedly connected to a fixed tube, the interior of the fixed tube is rotatably connected to a limit block, the lower end of the limit block is fixedly connected to a limit sleeve, the lower end of the limit sleeve contacts a valve body, the upper end of the valve body is fixedly connected to a connecting tube, the connecting tube is movably connected to the limit block, and a sealing mechanism is provided inside the fixed tube.

[0006] Preferably, a protrusion is fixedly connected to the inner wall of the fixed tube, and the protrusion is slidably connected to the limit block. The design of the protrusion can limit the limit block.

[0007] Preferably, the limiting sleeve contacts the fixed pipe, and the limiting sleeve is connected to the connecting pipe via a threaded connection. The limiting sleeve can limit the connecting pipe through its design.

[0008] Preferably, the sealing mechanism includes a fixed plate, a fixed plate is fixedly connected to the inner wall of the fixed tube, the lower end of the fixed plate is fixedly connected to a sleeve, the interior of the sleeve is slidably connected to a sliding rod, a spring is provided inside the sleeve, and the lower end of the sliding rod is fixedly connected to a sealing ring, and by plugging the connecting tube of the valve body and the fixed tube, the connecting tube drives the sealing ring to move, and the sealing ring drives the sliding rod to slide in the limiting ring, and the sliding rod squeezes the spring, and the sliding rod can be driven to move by the elastic force of the spring, so that the sliding rod drives the sealing ring to fit with the connecting tube, thereby effectively increasing the sealing between the fixed tube and the connecting tube.

[0009] Preferably, a limiting ring is fixedly connected to the interior of the sleeve, and the limiting ring is slidably connected to the sliding rod. The limiting ring can limit the sliding rod through its design.

[0010] Preferably, one end of the spring contacts the sleeve, and the other end of the spring contacts the slide rod. The design of the spring can drive the sealing ring to fit the connecting pipe.

[0011] Preferably, the sealing ring is slidably connected to the fixed pipe, and the sealing ring is in contact with the connecting pipe. Through the design of the sealing ring, the connection between the connecting pipe and the fixed pipe can be kept stable.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] 1. The utility model provides a limiting block, a limiting sleeve and other components, so that when the connecting pipe and the fixed pipe are plugged in, the limiting sleeve is rotated to cause the limiting sleeve and the connecting pipe to have a threaded movement, so that the limiting sleeve limits the connecting pipe, so that the connecting pipe and the fixed pipe remain stable after being connected, and solves the problem that the connecting pipe of the valve body and the fixed pipe of the meter head are unstable when being connected during use of the capacitive vacuum pressure sensor, which easily leads to leakage at the connection.

[0014] 2. The utility model is provided with components such as a slide rod, a spring, and a sealing ring. After the valve body is installed, the elastic force of the spring drives the slide rod to move, and the slide rod drives the sealing ring to move, so that the sealing ring fits with the connecting pipe, thereby effectively increasing the sealing between the connecting pipe and the fixed pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the overall structure of the utility model;

[0016] Figure 2 For the utility model Figure 1 A three-dimensional diagram of the local structure;

[0017] Figure 3 For the utility model Figure 1 A magnified front view and cross-sectional view of a local structure;

[0018] Figure 4 For the utility model Figure 3 A magnified view of the structure of part A.

[0019] In the figure: 1. meter head; 2. fixing tube; 3. limit block; 31. protrusion; 32. limit sleeve; 33. valve body; 34. connecting tube; 4. sealing mechanism; 41. fixing plate; 42. sleeve; 43. slide rod; 44. limit ring; 45. spring; 46. sealing ring. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figure 1-4 The capacitive vacuum pressure sensor includes a header 1, the lower end of the header 1 is fixedly connected to a fixed tube 2, the internal rotation connection of the fixed tube 2 is a limiting block 3, the inner wall of the fixed tube 2 is fixedly connected to a protrusion 31, the protrusion 31 is slidably connected to the limiting block 3, and the design of the protrusion 31 can limit the limiting block 3, the lower end of the limiting block 3 is fixedly connected to a limiting sleeve 32, the lower end of the limiting sleeve 32 contacts a valve body 33, the upper end of the valve body 33 is fixedly connected to a connecting tube 34, the connecting tube 34 is movably connected to the limiting block 3, the limiting sleeve 32 contacts the fixed tube 2, the limiting sleeve 32 and the connecting tube 34 are threadedly connected, and the design of the limiting sleeve 32 can limit the connecting tube 34, and a sealing mechanism 4 is provided inside the fixed tube 2.

[0022] See also Figure 2-4 The sealing mechanism 4 includes a fixed plate 41, which is fixedly connected to the inner wall of the fixed tube 2. The lower end of the fixed plate 41 is fixedly connected to a sleeve 42. The interior of the sleeve 42 is slidably connected to a slide rod 43. The interior of the sleeve 42 is fixedly connected to a limit ring 44, and the limit ring 44 is slidably connected to the slide rod 43. The design of the limit ring 44 can limit the slide rod 43. A spring 45 is provided inside the sleeve 42, one end of the spring 45 contacts the sleeve 42, and the other end of the spring 45 contacts the slide rod 43. The design of the spring 45 can drive the sealing ring 46 to fit with the connecting tube 34.

[0023] See also Figure 2-4The lower end of the slide rod 43 is fixedly connected with a sealing ring 46, which is slidably connected to the fixed tube 2. The sealing ring 46 contacts the connecting tube 34. Through the design of the sealing ring 46, the connection between the connecting tube 34 and the fixed tube 2 can be kept stable. By plugging the connecting tube 34 of the valve body 33 with the fixed tube 2, the connecting tube 34 drives the sealing ring 46 to move, and the sealing ring 46 drives the slide rod 43 to slide in the limit ring 44, so that the slide rod 43 squeezes the spring 45, and the slide rod 43 can be driven to move by the elastic force of the spring 45, so that the slide rod 43 drives the sealing ring 46 to fit with the connecting tube 34, thereby effectively increasing the sealing between the fixed tube 2 and the connecting tube 34.

[0024] The specific implementation process of the utility model is as follows: when in use, by plugging the connecting pipe 34 of the valve body 33 into the fixed pipe 2, the connecting pipe 34 drives the sealing ring 46 to move, and the sealing ring 46 drives the slide rod 43 to slide in the limit ring 44, so that the slide rod 43 squeezes the spring 45, and the elastic force of the spring 45 drives the slide rod 43 to move, so that the slide rod 43 drives the sealing ring 46 to fit with the connecting pipe 34, thereby effectively improving the sealing between the fixed pipe 2 and the connecting pipe 34;

[0025] By holding the fixed valve body 33 and then rotating the limiting sleeve 32, the limiting sleeve 32 and the connecting pipe 34 are threadedly moved, so that the limiting sleeve 32 limits the connecting pipe 34, and the connection between the connecting pipe 34 and the fixed pipe 2 can be kept stable.

[0026] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A capacitive vacuum pressure sensor, comprising a meter head (1), characterized in that: The lower end of the meter head (1) is fixedly connected to a fixed tube (2), the interior of the fixed tube (2) is rotatably connected to a limit block (3), the lower end of the limit block (3) is fixedly connected to a limit sleeve (32), the lower end of the limit sleeve (32) contacts a valve body (33), the upper end of the valve body (33) is fixedly connected to a connecting tube (34), the connecting tube (34) is movably connected to the limit block (3), and a sealing mechanism (4) is provided inside the fixed tube (2).

2. The capacitive vacuum pressure sensor according to claim 1, characterized in that: A protrusion (31) is fixedly connected to the inner wall of the fixed tube (2), and the protrusion (31) is slidably connected to the limiting block (3).

3. The capacitive vacuum pressure sensor according to claim 1, wherein: The limiting sleeve (32) contacts the fixed pipe (2), and the limiting sleeve (32) is connected to the connecting pipe (34) via threads.

4. The capacitive vacuum pressure sensor according to claim 1, wherein: The sealing mechanism (4) includes a fixed plate (41), the fixed plate (41) is fixedly connected to the inner wall of the fixed tube (2), the lower end of the fixed plate (41) is fixedly connected to a sleeve (42), the interior of the sleeve (42) is slidably connected to a slide rod (43), the interior of the sleeve (42) is provided with a spring (45), and the lower end of the slide rod (43) is fixedly connected to a sealing ring (46).

5. The capacitive vacuum pressure sensor according to claim 4, characterized in that: A limiting ring (44) is fixedly connected to the interior of the sleeve (42), and the limiting ring (44) is slidably connected to the sliding rod (43).

6. The capacitive vacuum pressure sensor according to claim 4, characterized in that: One end of the spring (45) contacts the sleeve (42), and the other end of the spring (45) contacts the slide bar (43).

7. The capacitive vacuum pressure sensor according to claim 4, characterized in that: The sealing ring (46) is slidably connected to the fixed pipe (2), and the sealing ring (46) is in contact with the connecting pipe (34).

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