Reference type mechanical gas density meter

Abstract

The utility model belongs to the technical field of gas density measurement, and particularly relates to a reference type mechanical gas density meter. Comprising a shell, a bourdon tube, a movement and a bimetal compensating plate, the air bag chamber is communicated with the inner cavity of the shell, a reference air bag is suspended in the air bag chamber, and reference gas is filled in the reference air bag and is used as a density reference substance; the reference air bag is in transmission connection with the spring tube through the elastic element. According to the reference type mechanical gas density meter, temperature compensation is carried out by utilizing the air pressure and temperature change of the reference air bag on the basis of double-metal-sheet compensation. Compared with a single bimetallic strip, the characteristic is more stable, and the measurement precision and sensitivity are higher.

Description

Technical Field

[0001] This utility model belongs to the field of gas density measurement technology, and specifically relates to a reference mechanical gas density meter. Background Technology

[0002] Existing gas density meters or gas density relays are generally composed of a C-type Bourdon tube assembly, a mechanism, a pointer, and a temperature compensation element. Ordinary instruments rely on the characteristics of a single bimetallic compensator and temperature changes for temperature compensation, which results in poor measurement accuracy and sensitivity. Utility Model Content

[0003] The purpose of this invention is to provide a reference-type mechanical gas density meter. This reference-type mechanical gas density meter utilizes the pressure and temperature changes of a reference gas bladder for temperature compensation based on bimetallic strip compensation. Compared with a single bimetallic strip, it has more stable characteristics and higher measurement accuracy and sensitivity.

[0004] To solve the above-mentioned technical problems, this utility model provides a reference mechanical gas density meter, comprising: a housing, a Bourdon tube, a mechanism, and a bimetallic compensation plate; and further comprising:

[0005] An airbag chamber is connected to the inner cavity of the shell, and a reference airbag is suspended in the airbag chamber. The reference airbag is filled with a reference gas for use as a density reference.

[0006] An elastic element is provided, through which the reference airbag is connected to the spring tube.

[0007] Preferably, it also includes a gauge joint, which is connected to the inner cavity of the housing and is disposed at the radial end or axial end of the housing.

[0008] Preferably, when the gauge connector is located at the axial end, the gauge connector is connected to the inner cavity of the housing through the airbag chamber.

[0009] Preferably, it also includes a contact signal junction box, which is arranged at the radial end of the housing and distributed at a 90° angle with the meter connector.

[0010] Preferably, it also includes a micro switch, which is built into the housing. The micro switch is activated to turn the contact signal junction box on and off.

[0011] Compared with the prior art, this utility model has the following advantages:

[0012] This invention enables sensitive measurement of gases of different densities. The reference material is a gas rather than a solid, so the measurement process is not affected by viscosity and suspended solid particles, thus reducing measurement errors. It has a large measurement range and stability, is suitable for the measurement and control of different gases, and has high sensitivity and accuracy. Attached Figure Description

[0013] Figure 1 This is a front view of the structure of Embodiment 1 of this utility model.

[0014] Figure 2 This is a right view of the structure of Embodiment 1 of this utility model.

[0015] Figure 3 This is a rear view of the structure of Embodiment 1 of this utility model.

[0016] Figure 4 This is a front view of the structure of Embodiment 2 of this utility model.

[0017] Figure 5 This is a right view of the structure of Embodiment 2 of this utility model.

[0018] Figure 6 This is a rear view of the structure of Embodiment 2 of this utility model.

[0019] In the diagram: 1-shell, 2-airbag chamber, 3-reference airbag, 4-meter connector, 5-contact signal junction box. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0021] Example 1

[0022] like Figures 1-3 As shown, this utility model embodiment provides a radial reference mechanical gas density meter, including: a housing 1, a Bourdon tube, a mechanism, and a bimetallic compensating plate; the specific connection structure and working principle of the Bourdon tube, mechanism, and bimetallic compensating plate are well known to those skilled in the art, and therefore will not be described in detail; it also includes:

[0023] The airbag chamber 2 is connected to the inner cavity of the shell 1, and a reference airbag 3 is suspended in the airbag chamber 2. The reference airbag 3 is filled with a reference gas and is used as a density reference.

[0024] The reference airbag 3 is connected to the spring tube via the elastic element.

[0025] It also includes a gauge connector 4 for introducing measuring gas. The gauge connector 4 is connected to the inner cavity of the housing 1 and is located at the radial end of the housing 1.

[0026] It also includes a contact signal junction box 5, which is located at the radial end of the housing 1 and is distributed at a 90° angle with the meter connector 4, achieving the advantages of compact structure, reasonable layout, small size, no space occupation, and easy installation.

[0027] It also includes a micro switch, which is built into the housing 1. The micro switch is activated to turn the connection and disconnect the junction box 5.

[0028] Example 2

[0029] like Figures 4-6 As shown, this utility model embodiment provides an axial reference mechanical gas density meter, including: a housing 1, a Bourdon tube, a mechanism, and a bimetallic compensating plate; the specific connection structure and working principle of the Bourdon tube, mechanism, and bimetallic compensating plate are well known to those skilled in the art, and therefore will not be described in detail; it also includes:

[0030] The airbag chamber 2 is connected to the inner cavity of the shell 1, and a reference airbag 3 is suspended in the airbag chamber 2. The reference airbag 3 is filled with a reference gas and is used as a density reference.

[0031] The reference airbag 3 is connected to the spring tube via the elastic element.

[0032] It also includes a gauge connector 4 for introducing measuring gas. The gauge connector 4 is connected to the inner cavity of the housing 1 and is located at the axial end of the housing 1.

[0033] When the gauge connector 4 is located at the axial end, the gauge connector 4 is connected to the inner cavity of the housing 1 through the air bladder chamber 2.

[0034] It also includes a contact signal junction box 5, which is located at the radial end of the housing 1 and is distributed at a 90° angle with the meter connector 4, achieving the advantages of compact structure, reasonable layout, small size, no space occupation, and easy installation.

[0035] It also includes a micro switch, which is built into the housing 1. The micro switch is activated to turn the connection and disconnect the junction box 5.

[0036] It also includes the following working principles:

[0037] By using a reference gas within a reference airbag 3 as a density reference, the density of the gas to be measured is determined by measuring the change in buoyancy of the reference airbag 3 within the gas to be measured. The magnitude of the buoyancy is directly proportional to the gas density. By altering the force on the elastic element through the change in buoyancy experienced by the reference airbag 3, the deformation of the Bourdon tube is further compensated by the elastic element. This secondary compensation, based on the compensation of the Bourdon tube by a bimetallic compensator, allows for more accurate measurement of gas density. While ordinary instruments rely on the characteristics of the bimetallic strip and temperature changes for temperature compensation, the reference instrument utilizes the pressure and temperature changes of the reference airbag 3 for temperature compensation, building upon the bimetallic strip compensation. Compared to the bimetallic compensator, the reference airbag has more stable characteristics, resulting in higher measurement accuracy and sensitivity.

[0038] The above description is only a description of the preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A reference mechanical gas density meter, comprising: The housing (1), the spring tube, the movement, and the bimetallic compensating plate; characterized in that it further includes: An airbag chamber (2) is connected to the inner cavity of the shell (1), and a reference airbag (3) is suspended in the airbag chamber (2). The reference airbag (3) is filled with a reference gas for use as a density reference. The reference airbag (3) is connected to the spring tube via the elastic element.

2. The reference mechanical gas density meter as described in claim 1, characterized in that, It also includes a gauge connector (4), which is connected to the inner cavity of the housing (1) and is located at the radial end or axial end of the housing (1).

3. A reference mechanical gas density meter as described in claim 2, characterized in that, When the gauge connector (4) is located at the axial end, the gauge connector (4) is connected to the inner cavity of the housing (1) through the airbag chamber (2).

4. A reference mechanical gas density meter as described in claim 2, characterized in that, It also includes a contact signal junction box (5), which is located at the radial end of the housing (1) and is distributed at a 90° angle with the meter connector (4).

5. A reference mechanical gas density meter as described in claim 4, characterized in that, It also includes a micro switch, which is built into the housing (1). The micro switch is activated to turn the contact signal junction box (5) on and off.

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