Digital density meter and sealing structure

Abstract

The utility model discloses a sealing structure, belongs to the technical field of digital density meters, and particularly relates to a digital density meter and a sealing structure, the sealing structure comprises a sealing base, a filter element and a sealing shell; the sealing base is fixedly connected with the sealing shell; the filter element is mounted in the sealing shell, and one end of the filter element is communicated with the sealing base; one end of the sealing base is provided with a gas inlet channel, the other end of the sealing base is provided with a gas outlet channel, and gas flows in through the gas inlet channel, is filtered by the filter element, enters the digital density meter for detection and flows out through the gas outlet channel; the sealing structure adopts the compression sealing filter element, the filter element removes a small amount of impurities in a filtered gas medium, normal work of the digital density meter can be protected, the detection accuracy of the digital density meter can be improved, and when gas passes through the filter element with certain precision in the sealing structure, the impurities of the gas are blocked; and the clean gas is detected by the digital density meter and flows out.

Description

Technical Field

[0001] The utility model discloses a sealing structure, belonging to the technical field of digital density meters, and particularly relates to a digital density meter and a sealing structure. Background Art

[0002] Density refers to the mass per unit volume of a specific substance under specific conditions. The SF6 gas in an SF6 circuit breaker is sealed in a fixed container. At the rated pressure at 20°C, it has a certain density value. Within the various allowable operating conditions of the circuit breaker, although the pressure of the SF6 gas changes with temperature, the density value of the SF6 gas remains constant. Since the insulation and arc extinguishing performance of the SF6 circuit breaker largely depend on the purity and density of the SF6 gas, it is particularly important to detect the purity of the SF6 gas and monitor its density. If an ordinary pressure gauge is used to monitor the leakage of the SF6 gas, it will be impossible to distinguish whether it is due to actual leakage or due to the pressure change of the SF6 gas caused by environmental temperature changes. In order to achieve the purpose of constantly monitoring the density, the national standard stipulates that an SF6 circuit breaker should be equipped with a pressure gauge or an SF6 gas density meter and a density relay. The pressure gauge or the SF6 gas density meter is for monitoring, and the density relay is for control and protection.

[0003] The SF6 gas density meter installed on the SF6 circuit breaker, which has a pointer and scale, is called a density meter; the one without a pointer and scale is called a density relay or a density pressure switch; some SF6 gas density meters also have electrical contacts, that is, they also serve as density relays. They are all special meters for measuring the SF6 gas.

[0004] In addition to the impurities generated during the synthesis of the existing SF6 gas, a small amount of impurities, such as air, moisture, and mineral oil, can also be mixed into the gas filling process. All these impurities contain or will generate certain toxic substances. Therefore, in order to ensure purity and quality, a digital density meter that can perform sealed filtration is required to filter the gas before density detection. Summary of the Utility Model

[0005] Utility Model Objective: To provide a digital density meter and a sealing structure to solve the above-mentioned problems.

[0006] First aspect: A sealing structure of a digital density meter, the sealing structure includes: a sealing base, a filter core, and a sealing shell;

[0007] In a further embodiment, the sealing base is fixedly connected to the sealing shell; the filter core is installed in the sealing shell and one end of the filter core is communicated with the sealing base;

[0008] One end of the sealed base is provided with an air inlet channel, and the other end is provided with an air outlet channel. Gas flows in through the air inlet channel, is filtered by the filter element, enters the digital density meter for detection, and flows out through the air outlet channel.

[0009] In a further embodiment, the filter element is composed of an upper seat, a lower seat, a filter screen, and a plurality of filter plates;

[0010] The filter screen is installed between the upper seat and the lower seat. There are a plurality of filter plates, which are installed on the filter screen in a circumferential array manner.

[0011] In a further embodiment, the interior of the sealed base is in the shape of a cavity, and an air inlet and an air outlet are respectively provided at both ends. A channel is provided in the internal cavity of the sealed base, which is connected to the air inlet to form an air inlet channel, and at the same time, the other area forms an air outlet channel with the air outlet.

[0012] In a further embodiment, a sealing ring is provided between the sealed base and the sealed shell.

[0013] Second aspect: A digital density meter, characterized in that it is composed of a meter housing, an elastic metal tube, a joint, a bimetallic strip, a gear-pointer drive, a follower gear, an adjustable resistor, a circuit board, and the sealing structure.

[0014] In a further embodiment, one end of the joint is connected to the meter housing, and the other end is connected to the sealing structure; the elastic metal tube is installed inside the joint and the meter housing; one end of the bimetallic strip is connected to the elastic metal tube, and the other end is in transmission cooperation with the gear-pointer drive. The gear-pointer drive meshes with the follower gear, and the adjustable resistor is connected to the follower gear and the circuit board.

[0015] Beneficial effects: The present utility model provides a digital density meter and a sealing structure. The sealing structure uses a compression sealing filter element: the filter element removes a small amount of impurities in the filtered gas medium, which can protect the normal operation of the digital density meter and improve the detection accuracy of the digital density meter. When the gas passes through the filter element with a certain accuracy in the sealing structure, its impurities are blocked, and the clean gas passes through the digital density meter for detection and then flows out. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the sealing structure of the present utility model.

[0017] Figure 2 It is a cross-sectional view of the sealing structure of the present utility model.

[0018] Figure 3 It is a schematic diagram of the digital density meter of the present utility model.

[0019] Reference numerals: watch case 1, elastic metal tube 2, joint 3, bimetallic strip 5, gear-pointer drive 6, follower gear 7, adjustable resistor 8, circuit board 9, gas 4, sealing base 10, filter element 11, sealing shell 12, sealing ring 13, upper seat 14, lower seat 15, filter screen 16, filter disc 17. Detailed implementation

[0020] The technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative work fall within the protection scope of the present utility model.

[0021] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" 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 of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations. In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0023] A sealing structure of a digital density meter, comprising: a sealing base 10, a filter element 11 and a sealing shell 12;

[0024] In one embodiment, as Figures 1 to 2 shown, the sealing base is fixedly connected to the sealing shell 12; the filter element 11 is installed in the sealing shell 12 and one end is communicated with the sealing base 10;

[0025] One end of the sealing base 10 is provided with an air inlet channel, and the other end is provided with an air outlet channel. The gas 4 flows in through the air inlet channel, is filtered by the filter element 11, enters the digital density meter for detection, and flows out through the air outlet channel.

[0026] In one embodiment, as Figures 1 to 2 shown, the filter element 11 is composed of an upper seat 14, a lower seat 15, a filter screen 16 and a plurality of filter plates 17;

[0027] The filter screen 16 is installed between the upper seat 14 and the lower seat 15. A plurality of filter plates 17 are provided and are installed on the filter screen 16 in a circumferential array manner.

[0028] In one embodiment, as Figures 1 to 2 shown, the interior of the sealing base 10 is in a cavity shape, and air inlets and air outlets are respectively provided at both ends. A channel is provided in the internal cavity of the sealing base 10, which is communicated with the air inlet to form an air inlet channel, and at the same time, other areas form an air outlet channel with the air outlet.

[0029] In one embodiment, as Figures 1 to 2 shown, a sealing ring 13 is provided between the sealing base 10 and the sealing shell 12.

[0030] A digital density, as Figure 3 shown, is composed of a meter housing 1, an elastic metal tube 2, a joint 3, a bimetallic strip 5, a gear-pointer drive 6, a follower gear 7, a variable resistor 8, a circuit board 9 and the sealing structure.

[0031] In one embodiment, as Figure 3 shown, one end of the joint 3 is connected to the meter housing 1, and the other end is connected to the sealing structure; the elastic metal tube 2 is installed in the joint 3 and the meter housing 1; one end of the bimetallic strip 5 is connected to the elastic metal tube 2, and the other end is matched with the gear-pointer drive 6. The gear-pointer drive 6 is meshed with the follower gear 7, and the variable resistor 8 is connected to the follower gear 7 and the circuit board 9.

[0032] Working principle: When the present utility model is in operation, the digital density meter and the sealing structure are installed in the working area. The air inlet is connected to a trachea, and gas 4 flows in through the air inlet and is input into the filter element 11 through the air inlet passage. The filter element 11 filters out a small amount of impurities in the gas 4 medium through the filter screen 16 and the filter disc 17, which can protect the normal operation of the digital density meter and provide the detection accuracy of the digital density meter. When the gas 4 passes through the filter element with a certain precision in the sealing structure, its impurities are blocked, and the clean gas 4 enters the digital density meter for detection. The gas 4 drives the gear pointer transmission 6 through the elastic metal tube 2. A follower gear 7 that rotates as the pointer rotates is installed in the gear pointer transmission 6 mechanism. The power output end of the follower gear 7 is drivingly connected to a variable resistor 8 for detecting the rotation angle of the pointer. The signal output end of the variable resistor 8 is connected to a circuit board 9 for signal processing and communication with the upper computer. In this way, the change in the position signal of the pointer can be converted into the change in the resistance value of the variable resistor 8. By measuring the change in the resistance value of the variable resistor 8, the real-time pointer position signal, i.e., the density signal, can be calculated. The detected gas 4 flows out through the air outlet passage.

[0033] Obviously, the above embodiments are merely examples for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. The obvious changes or modifications derived therefrom still fall within the protection scope of the present utility model.

Claims

1. A sealing structure of a digital density meter, characterized in that: The sealing structure comprises: a sealing base, a filter element and a sealing shell; The sealing base is fixedly connected to the sealing shell; the filter element is installed in the sealing shell and one end of the filter element is connected to the sealing base; An air inlet channel is provided at one end of the sealing base, and an air outlet channel is provided at the other end. Gas flows in through the air inlet channel, is filtered by the filter element, enters the digital density meter for detection, and flows out through the air outlet channel.

2. The sealing structure of a digital density meter according to claim 1, characterized in that: The filter element is composed of an upper seat, a lower seat, a filter screen and a plurality of filter sheets; The filter screen is installed between the upper seat and the lower seat, and a plurality of filter plates are provided and installed on the filter screen in a circular array.

3. The sealing structure of a digital density meter according to claim 1, characterized in that: The interior of the sealing base is in the shape of a cavity, and an air inlet and an air outlet are respectively provided at both ends. The internal cavity of the sealing base is provided with a channel, which is connected with the air inlet to form an air inlet channel, and other areas and the air outlet form an air outlet channel.

4. The sealing structure of a digital density meter according to claim 1, characterized in that: A sealing ring is arranged between the sealing base and the sealing shell.

5. A digital density meter, characterized in that: The invention is composed of a case, an elastic metal tube, a joint, a bimetallic strip, a gear pointer transmission, a follower gear, an adjustable resistor, a circuit board and a sealing structure of a digital density meter as claimed in any one of claims 1 to 4.

6. A digital density meter according to claim 5, characterized in that: One end of the joint is connected to the watch case, and the other end is connected to the sealing structure; the elastic metal tube is installed in the joint and the watch case; one end of the bimetallic strip is connected to the elastic metal tube, and the other end cooperates with the gear pointer transmission, the gear pointer transmission is meshed with the follower gear, and the adjustable resistor is connected to the follower gear and the circuit board.

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