CN211725020U - A filter for pressure calibration - Google Patents

Abstract

The utility model discloses a filter used for pressure calibration. The filter includes a nut with a cavity in the middle, a stud with a cavity in the middle, and a filter screen installed on the stud, the stud is detachably installed at the rear end of the nut, and the nut is watertight with the cylinder. A filter is arranged at the interface end of the pressure gauge, that is, the cylinder body. Through the nut, stud and filter screen in the filter, the filter can be detachably installed on the cylinder body, and the pipes and the pressure gauge can be effectively filtered. The detachable structure facilitates the installation and cleaning of the filter, avoids the blockage of the pipeline, and improves the detection accuracy and work efficiency of the pressure gauge.

Description

A filter for pressure calibration

technical field

The utility model belongs to the technical field of medium conveying, and more particularly relates to a filter used for pressure calibration.

Background technique

Any use of liquid, gas or steam as power, transmission medium, combustion body, etc. must reflect the effect of pressure. In this way, various pressure gauges are needed to indicate the presence, size and change of pressure to ensure the smooth progress of the work, especially in terms of safety protection. The existing pressure gauge generally consists of a hollow cylinder in the middle, a sewage part connected to the cylinder, a transmission device for testing the pressure, and an electrical control part for controlling the opening and closing of the medium in the cylinder. Connect to the pipe end of the medium delivery device and the pipe end of the use device.

With the development of industry and the deepening of safety awareness in recent years, the work of ensuring the accuracy and reliability of pressure gauges and ensuring periodic verification has become more and more arduous. (6,000 pressure gauges are calibrated annually) The pressure gauge is an important part of the pressure calibration system. Generally, most of the pressure gauges that need to be calibrated are pressure gauges used in boilers and pipeline equipment. There is more dust and some other debris.

The working process of the pressure gauge:

A boost process detection

1. First, screw the standard pressure gauge and the pressure gauge under test into the quick joints of the pipeline respectively. They must be completely tightened to prevent leakage during use and ensure the safety of the meter calibration personnel.

2. Secondly, turn on the oil return switch when the air in the pipeline is emptied, and turn the pressure increase (decrease) handwheel counterclockwise to fully open.

3. Turn off the oil return switch, and rotate the pressure increase (decrease) handwheel clockwise. At this time, the pressure will gradually rise and approach the first verification point, and then the pressure will be increased smoothly and slowly to the required pressure value. After writing down the data of the standard pressure gauge and the tested pressure gauge at this point, continue to pressurize clockwise steadily and slowly so that the pressure value reaches the next check point, and check point by point until the end of the pressure rise process.

B. Depressurization process detection

1. After the pressure rise process is detected and the pressure resistance test is passed, directly rotate the pressure increasing (decreasing) handwheel smoothly and slowly counterclockwise to decompress and adjust to the required pressure value.

2. Detect point by point until the end of the pressure drop process.

3. Finally, turn the increasing (decreasing) pressure handwheel counterclockwise to make the pressure in the system zero.

In the actual verification process, it was found that these dust and sundries would be brought into the pipeline during the depressurization process, causing the pipeline to be blocked. Since the pressure gauges produced by most manufacturers do not have the functions of dust prevention and filtration, it is not easy to maintain and clean, and cleaning and dredging are extremely troublesome, which greatly reduces the work efficiency.

Utility model content

In view of the deficiencies of the prior art, the purpose of the present invention is to provide a filter for pressure calibration, which has the advantages of preventing dust and sundries from being brought into the pipeline, facilitates cleaning, and improves the accuracy of calibration degree and work efficiency.

In order to achieve the above purpose, the utility model provides the following technical solutions: a filter for pressure calibration, comprising a cylinder body and a filter detachably installed in the hollow cavity of the cylinder body, the filter is located between the cylinder body and the cylinder body. One end of the medium conveying device is connected, the filter includes a nut with a cavity in the middle, a stud with a cavity in the middle, and a filter screen installed on the stud, the stud is detachably installed at the rear end of the nut, so The nut is watertight with the cylinder. A filter is arranged at the interface end of the pressure gauge, that is, the cylinder body. Through the nut, stud and filter screen in the filter, the filter can be detachably installed on the cylinder body, and the pipes and the pressure gauge can be effectively filtered. The detachable structure facilitates the installation and cleaning of the filter, avoids the blockage of the pipeline, and improves the detection accuracy and work efficiency of the pressure gauge.

By adopting the above technical solution, the cavity at the rear end of the stud is provided with an accommodating portion for installing a nut, and the nut is detachably installed in the accommodating portion.

The utility model is further provided that: the inner peripheral wall of the nut is provided with an inner thread, the stud is provided with an outer thread matched with the inner thread, and the stud is detachably installed in the nut accommodating part. Of course, the nut and the stud can also adopt the existing technology, and can also achieve the same technical effect.

By adopting the above technical solution, the cavity of the nut and the cavity of the stud are respectively a first channel and a second channel, the diameter of the first channel is larger than the diameter of the second channel, and the front end of the second channel is the same as the diameter of the second channel. The rear ends of the first channels are connected.

The utility model is further provided that: the surface opposite to the outer peripheral wall of the stud and the inner peripheral wall of the cylinder is provided with a clamping groove, and the clamping groove is sleeved with a sealing ring.

By adopting the above technical solution, the filter screen is arranged in the second channel, and the shape and size of the filter screen and the second channel are suitable. The utility model is further set as follows: the filter screen is a 60 to 120 mesh filter screen.

By adopting the above technical solution, the filter screen is provided with a plurality of regularly arranged filter holes, and the filter holes are 150um to 240um.

The utility model is further provided that: the cylinder body comprises a pressure gauge joint body and a joint detachably installed on the joint main body, and the joint main body and the joint are watertight.

The utility model is further configured as follows: the nut and the stud are detachably installed on the joint body, the rear end of the nut protrudes from the rear end of the interface main body and into the front end of the joint, and the joint is installed on the joint main body .

To sum up, the utility model has the following advantages: a filter is arranged at the interface end of the pressure gauge, that is, the cylinder body, and through the nut, stud and filter screen in the filter, the filter can be detachably installed on the The detachable structure facilitates the installation and cleaning of the filter, avoids the blockage of the pipeline, and improves the detection accuracy and work efficiency of the pressure gauge.

Description of drawings

Fig. 1 is the sectional view of the present utility model;

Fig. 2 is the exploded view (section) of the present utility model;

Fig. 3 is a three-dimensional schematic diagram when the cylinder body and the filter are integrally externally connected to the pressure gauge.

Description of reference numerals: 10 is a cylinder; 11 is a joint body; 12 is a joint; 2 is a nut; 21 is a receiving part; 22 is an internal thread; 23 is a first channel; 32 is the second channel; 4 is the filter screen.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are a part of the embodiments of the present invention, not all of the embodiments.

The components of the embodiments of the invention generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention.

Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner" and "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, with a specific orientation. Therefore, it should not be construed as a limitation on the present invention. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a connectable connection. Detachable connection, or integral connection; may be mechanical connection or electrical connection; may be direct connection, or indirect connection through an intermediate medium, or internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

A filter for pressure calibration, as shown in Figures 1 to 3, includes a filter for pressure calibration, comprising a cylinder body 1 and a filter detachably installed in the hollow cavity of the cylinder body 1 , the filter is located at the connection end of the cylinder 1 and the medium conveying device, and the filter includes a nut 2 with a cavity in the middle, a stud 3 with a cavity in the middle, and a filter screen 4 installed on the stud 3, so The stud 3 is detachably mounted on the rear end of the nut 2 , and the nut 2 is watertight with the cylinder 1 . A filter is provided at the interface end of the pressure gauge, that is, the cylinder body 1. Through the nut 2, the stud 3 and the filter screen 4 in the filter, the filter can be detachably installed on the cylinder body 1, and the filter can be effectively filtered. Impurities and dust in pipes and pressure gauges, and the detachable structure facilitates the installation and cleaning of the filter, avoids the blockage of the pipes, and improves the detection accuracy and work efficiency of the pressure gauge.

Specifically, the cylinder body 1 can be externally connected to the pressure gauge as a separate entity, or can be integrally formed with one end of the pressure gauge through a filter and the cylinder body when the pressure gauge is manufactured.

Specifically, the cavity at the rear end of the stud 3 is provided with an accommodating portion 21 for installing a nut 2 , and the nut 2 is detachably mounted on the accommodating portion 21 .

In the embodiment of the present invention, the inner cavity of the stud 3 is distributed in a trapezoid shape.

More specifically, the inner peripheral wall of the nut 2 is provided with an inner thread 22 , and the stud 3 is provided with an outer thread 31 matched with the inner thread 22 , and the stud 3 is detachably installed in the accommodating portion of the nut 2 . within 21. Of course, the nut 2 and the stud 3 can also adopt the existing technology, and can also achieve the same technical effect.

In the embodiment of the present invention, the cavity of the nut 2 and the cavity of the stud 3 are the first channel 23 and the second channel 32, respectively. The diameter of the first channel 23 is larger than the diameter of the second channel 32, so The front end of the second channel 32 is connected with the rear end of the first channel 23 . The diameter of the second channel 32 is larger than that of the first channel 23, which effectively improves the flow capacity of oil (or water), avoids clogging, and also improves the test accuracy of the pressure gauge.

Specifically, a surface opposite to the outer peripheral wall of the stud 3 and the inner peripheral wall of the cylinder body 1 is provided with a clamping groove 24, and the clamping groove 24 is sleeved with a sealing ring. The sealing performance of the stud 3 is further improved. Of course, a gasket can also be provided at the interface between the stud 3 and the cylinder body 1 to further improve the sealing performance.

In the embodiment of the present invention, the filter screen 4 is disposed in the second channel 32 , and the filter screen 4 is suitable in shape and size with the second channel 32 . The setting of the filter screen 4 can maximize the filtration efficiency and also facilitate cleaning. Of course, the filter screen 4 can also be arranged between the nut 2 and the stud 3, and the same technical effect can also be achieved.

Specifically, the filter screen 4 is a 60 to 120 mesh filter screen 4, and the filter screen 4 is made of copper.

More specifically, the filter screen 4 is provided with a plurality of regularly arranged filter holes, and the filter holes are 150um to 240um.

In the embodiment of the present invention, the cylinder body 1 includes a joint main body 11 of a pressure gauge and a joint 12 detachably mounted on the joint main body 11 , and the joint main body 11 and the joint 12 are watertight. That is, the filter is installed at the interface of the pressure gauge, which is suitable for most of the existing products, and the filtering effect can also be achieved without replacing the product. The detachable installation method is threaded connection.

Specifically, the nut 2 and the stud 3 are detachably installed on the joint main body 11 , the rear end of the nut 2 protrudes from the rear end of the interface main body and into the front end of the joint 12 , and the joint 12 is installed on the joint 12 . Joint body 11 . Fix the nut 2 and the stud 3 on one end of the medium conveying device of the pressure gauge.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the design concept of the present invention shall be included in the present invention. within the scope of the new protection.

Claims (10)

1. A filter for pressure calibration is characterized by comprising a cylinder body and a filter detachably arranged in a hollow cavity of the cylinder body, wherein the filter is positioned at one end, connected with a medium conveying device, of the cylinder body, the filter comprises a nut with a cavity in the middle, a stud with a cavity in the middle and a filter screen arranged on the stud, the stud is detachably arranged at the rear end of the nut, and the nut and the cylinder body are watertight.

2. A filter for pressure calibration as defined in claim 1, wherein: the cavity at the rear end of the stud is provided with an accommodating part for mounting a nut, and the nut is detachably mounted in the accommodating part.

3. A filter for pressure calibration as defined in claim 2, wherein: the inner peripheral wall of the nut is provided with an internal thread, the stud is provided with an external thread matched with the internal thread, and the stud is detachably mounted in the nut accommodating part.

4. A filter for pressure calibration as defined in claim 2, wherein: the cavity of the nut and the cavity of the stud are respectively a first channel and a second channel, the diameter of the first channel is larger than that of the second channel, and the front end of the second channel is connected with the rear end of the first channel.

5. A filter for pressure calibration as defined in claim 2, wherein: the relative surface of double-screw bolt periphery wall and barrel internal perisporium is equipped with the draw-in groove, the draw-in groove cover is equipped with the sealing washer.

6. A filter for pressure calibration according to claim 4, wherein: the filter screen set up in the second passageway, the filter screen with the second passageway shape, size are fit for.

7. A filter for pressure verification according to claim 6, wherein: the filter screen is 60-120 meshes; the filter screen is equipped with the filtration pore that a plurality of rules set up, filtration pore 150um to 240 um.

8. The filter for pressure calibration according to claim 2, wherein the stud cavities are distributed in a trapezoid shape.

9. A filter for pressure verification according to claim 7, wherein: the barrel includes the joint main part and detachably installs in the joint of connecting the main part, connect the main part and connect the watertight.

10. A filter for pressure verification according to claim 9, wherein: the nut and the stud are detachably mounted on the joint main body, the rear end of the nut extends out of the rear end of the interface main body and extends into the front end of the joint, and the joint is mounted on the joint main body.

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