A diaphragm straightening device for pressure gauges

Abstract

The utility model relates to instrument and meter technical field, concretely relates to a kind of isolating diaphragm leveling device for pressure gauge.The leveling device includes negative pressure head and sealing gasket, first negative pressure passage is equipped on negative pressure head, and negative pressure passage is used to communicate with negative pressure generating device;Sealing gasket is arranged in the side of negative pressure head, and sealing gasket is equipped with the second negative pressure passage that communicates with first negative pressure passage, and the side of sealing gasket away from negative pressure head is equipped with a plurality of first negative pressure grooves that communicate with third negative pressure passage.Use, negative pressure generating device communicates first negative pressure passage, sealing gasket is adhered to the outside of isolating diaphragm needing reset, and sealing gasket and the edge of isolating diaphragm not deformed are adhered together.By negative pressure generating device, isolating diaphragm is inhaled to the outside, so that the part of middle concave of isolating diaphragm recovers flat, and then the working cavity of diaphragm pressure gauge can be filled with sufficient working oil, so that pointer can normally work.

Description

Technical Field

[0001] This utility model relates to the field of instrumentation technology, specifically to a diaphragm leveling device for pressure gauges. Background Technology

[0002] Diaphragm pressure gauges are suitable for measuring the pressure of highly corrosive, high-temperature, high-viscosity, easily crystallizing, easily solidifying, and media containing suspended solids, as well as in situations where direct entry of the measured medium into general-purpose pressure instruments must be avoided, sediment accumulation must be prevented, and easy cleaning is required. When using a diaphragm pressure gauge, the pressure of the measured medium acts on the diaphragm, causing it to deform and compress the working fluid filling the working chamber. This working fluid causes corresponding elastic deformation at the free end of the elastic element (Bourdon tube) in the diaphragm pressure gauge, and the measured pressure value is displayed according to the working principle of the corresponding pressure instrument.

[0003] Currently, when the working chamber of a diaphragm pressure gauge is evacuated by an external oil-filling vacuum unit, the diaphragm is forced inward by the external atmospheric pressure, making it difficult for the diaphragm to return to its original shape. After the working chamber is evacuated, during the oil filling process, the working oil enters the working chamber under the pressure of standard atmospheric pressure. After oil filling, the pressure values ​​on both sides of the diaphragm are the same, and the diaphragm cannot return to its original shape, remaining in an inward concave state. This results in insufficient working oil in the working chamber, causing the diaphragm pressure gauge pointer to not move or not reach its full reading. Utility Model Content

[0004] To address the aforementioned deficiencies, the technical problem to be solved by this utility model is to provide a diaphragm leveling device for pressure gauges. This leveling device can easily level the concave diaphragm of the diaphragm pressure gauge, solving the problem of insufficient working oil in the working chamber, which affects the diaphragm pressure gauge pointer from moving or not reaching full volume.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A diaphragm leveling device for a pressure gauge, comprising:

[0007] A negative pressure head, wherein the negative pressure head is provided with a first negative pressure channel, the first negative pressure channel being used to communicate with a negative pressure generating device;

[0008] A sealing gasket is disposed on one side of the negative pressure head. The sealing gasket has a second negative pressure channel communicating with the first negative pressure channel. On the side of the sealing gasket away from the negative pressure head, there are several first negative pressure grooves communicating with the second negative pressure channel.

[0009] By adopting the above scheme, during use, the negative pressure generating device is connected to the first negative pressure channel. The sealing gasket is attached to the outside of the isolation diaphragm of the diaphragm pressure gauge that needs to be reset, with the sealing gasket adhering to the undeformed edge of the isolation diaphragm. Negative pressure is generated by the negative pressure generating device, creating negative pressure in the first negative pressure groove. This negative pressure in the first negative pressure groove pulls the isolation diaphragm outward, thus restoring the concave portion of the isolation diaphragm to its flat state. Since only a portion of the sealing gasket has the first negative pressure groove, after the isolation diaphragm returns to horizontal under the action of negative pressure, the portion of the sealing gasket without the first negative pressure groove forms a barrier against the isolation diaphragm, preventing it from bulging outward and effectively ensuring the flatness of the isolation diaphragm after reset.

[0010] Preferably, the first negative pressure groove is annular. The annular shape of the first negative pressure groove provides a more uniform force to the insulating diaphragm.

[0011] Preferably, there are two first negative pressure grooves, which are concentrically arranged and spaced apart. The two annular negative pressure grooves provide a more uniform force to the insulating diaphragm.

[0012] Preferably, the two first negative pressure grooves are interconnected.

[0013] Preferably, the sealing gasket has a second negative pressure groove on the side away from the negative pressure head, and the second negative pressure groove connects the second negative pressure channel and all the first negative pressure grooves. Connecting the second negative pressure channel and all the first negative pressure grooves via the second negative pressure groove results in a more rational structure, facilitating the provision of negative pressure to restore the flatness of the isolation diaphragm.

[0014] Preferably, the negative pressure head has a negative pressure nozzle on the side away from the sealing gasket, which communicates with the first negative pressure channel. The negative pressure nozzle facilitates connection to the negative pressure pipeline of the negative pressure generating device.

[0015] Preferably, the negative pressure head has a mounting groove on the side near the sealing gasket that matches the shape of the sealing gasket, and a section of the sealing gasket along its thickness direction is embedded in the mounting groove. The mounting groove facilitates the installation of the sealing gasket and better restricts its position.

[0016] Preferably, the sealing gasket is made of rubber. Using rubber for the sealing gasket improves the seal between the gasket and the diaphragm, thus enhancing the effect of generating negative pressure.

[0017] Preferably, the sealing gasket is made of silicone rubber.

[0018] Preferably, the sealing gasket is connected to the negative pressure head via a self-tapping screw. The self-tapping screw facilitates the connection between the sealing gasket and the negative pressure head.

[0019] In summary, the diaphragm leveling device for pressure gauges provided by this utility model has at least the following beneficial effects:

[0020] 1. It can easily reset the recessed part of the diaphragm of the diaphragm pressure gauge, ensuring sufficient working oil in the working chamber, thereby ensuring that the pointer of the diaphragm pressure gauge can work normally.

[0021] 2. The overall structure is simple and easy to operate. Attached image description:

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any novel effort.

[0023] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0024] Figure 2 This is a cross-sectional structural diagram of the negative pressure head in this utility model;

[0025] Figure 3 This is a front view of the sealing gasket in this utility model;

[0026] Figure 4 This is a comparison diagram showing the positional changes of the diaphragm in a diaphragm pressure gauge before and after evacuating its internal working chamber, as described in the background art.

[0027] The reference numerals in the attached drawings include: negative pressure head 1, first negative pressure channel 2, sealing gasket 3, second negative pressure channel 4, first negative pressure groove 5, second negative pressure groove 6, negative pressure nozzle 7, mounting groove 8, working chamber 9, and isolation diaphragm 10. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of this utility model, the following description is provided in conjunction with the appendix. Figure 1-3 The present invention will be further described in detail below with reference to specific embodiments.

[0029] Please see Figure 1-3This embodiment provides a diaphragm leveling device for a pressure gauge, comprising a negative pressure head 1 and a sealing gasket 3 arranged sequentially from right to left. The sealing head is cylindrical, and the sealing gasket 3 is circular. A first negative pressure channel 2 is formed in the middle of the negative pressure head 1, extending axially through the negative pressure head 1 and communicating with a negative pressure generating device. The negative pressure generating device is a vacuum generator or other device commonly used in the prior art that can generate negative pressure within the first negative pressure channel 2. The sealing gasket 3 is located on the left side of the negative pressure head 1, and a second negative pressure channel 4 communicating with the first negative pressure channel 2 is formed in the middle of the sealing gasket 3 along the axial direction. Several first negative pressure grooves 5 communicating with the second negative pressure channels 4 are formed on the left side of the sealing gasket 3, and the first negative pressure grooves 5 are annular.

[0030] Preferably, in this embodiment, there are two first negative pressure grooves 5, with one diameter larger than the other, and the two first negative pressure grooves 5 are concentrically arranged, that is, the centers of the two annular first negative pressure grooves 5 are located at the same point on the sealing gasket 3, and there is a gap between the two first negative pressure grooves 5. The two first negative pressure grooves 5 are interconnected. A second negative pressure groove 6 is provided on the left side of the sealing gasket 3, and the second negative pressure groove 6 connects the second negative pressure channel 4 and all the first negative pressure grooves 5. Specifically, the length direction of the second negative pressure groove 6 is arranged radially along the sealing gasket 3, and both ends of the second negative pressure groove 6 are connected to the inner ring sidewall of the outermost first negative pressure groove 5, and the middle part of the second negative pressure groove 6 is connected to the second negative pressure channel 4. The first negative pressure groove 5 is an annular groove, with an annular bottom wall, an outer ring sidewall, and an inner ring sidewall, and the diameter of the inner ring sidewall is smaller than the diameter of the outer ring sidewall. A negative pressure nozzle 7 connected to the first negative pressure channel 2 is provided on the right side of the negative pressure head 1. The negative pressure head 1 has a circular mounting groove 8 on its left side, which fits the shape of the sealing gasket 3. A portion of the sealing gasket 3 along its thickness direction is embedded in the mounting groove 8, specifically the right portion of the sealing gasket 3. The sealing gasket 3 is made of rubber, as is available in the prior art, and may specifically be made of silicone rubber. The sealing gasket 3 is connected to the negative pressure head 1 using self-tapping screws.

[0031] In some other embodiments, three or more first negative pressure grooves 5 may be provided. All first negative pressure grooves 5 are annular and all annular first negative pressure grooves 5 are concentrically arranged. The diameter of the annular first negative pressure grooves 5 increases sequentially. Adjacent first negative pressure grooves 5 are spaced a certain distance apart. The second negative pressure groove 6 is arranged radially along the sealing gasket 3. The middle part of the second negative pressure groove 6 is connected to the second negative pressure channel 4. Both ends of the second negative pressure groove 6 are connected to the outermost first negative pressure groove 5.

[0032] By adopting the above scheme, during use, the negative pressure generating device is connected to the first negative pressure channel 2, and the sealing gasket 3 is attached to the outside of the isolation diaphragm 10 of the diaphragm pressure gauge that needs to be reset. The sealing gasket 3 is attached to the undeformed edge of the isolation diaphragm 10. The negative pressure generated by the negative pressure generating device generates negative pressure in the first negative pressure groove 5. The negative pressure in the first negative pressure groove 5 and the second negative pressure groove 6 pulls the isolation diaphragm 10 outward, thereby restoring the concave part in the middle of the isolation diaphragm 10 to flatness. Since only a part of the sealing gasket 3 has the first negative pressure groove 5, after the isolation diaphragm 10 returns to horizontal under the action of negative pressure, the part of the sealing gasket 3 without the first negative pressure groove 5 forms a blockage against the isolation diaphragm 10, thereby preventing the isolation diaphragm 10 from bulging outward and effectively ensuring the flatness of the isolation diaphragm 10 after reset.

[0033] It should be noted that words indicating direction in this article, such as "up" and "down," are all in the format of "upper" and "lower." Figure 1 The direction setting is for ease of description only and has no other specific meaning.

[0034] It should also be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or apparatus comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or apparatus that includes the aforementioned element.

[0035] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A diaphragm leveling device for a pressure gauge, characterized in that, include: A negative pressure head (1) is provided with a first negative pressure channel (2), which is used to communicate with a negative pressure generating device; A sealing gasket (3) is provided on one side of the negative pressure head (1). The sealing gasket (3) is provided with a second negative pressure channel (4) that communicates with the first negative pressure channel (2). A plurality of first negative pressure grooves (5) that communicate with the second negative pressure channel (4) are provided on the side of the sealing gasket (3) away from the negative pressure head (1).

2. The diaphragm leveling device for a pressure gauge according to claim 1, characterized in that, The first negative pressure groove (5) is annular.

3. The diaphragm leveling device for a pressure gauge according to claim 2, characterized in that, There are two first negative pressure grooves (5), which are arranged concentrically and are spaced apart.

4. A diaphragm leveling device for a pressure gauge according to claim 3, characterized in that, The two first negative pressure grooves (5) are interconnected.

5. A diaphragm leveling device for a pressure gauge according to any one of claims 1-4, characterized in that, The sealing gasket (3) has a second negative pressure groove (6) on the side away from the negative pressure head (1), and the second negative pressure groove (6) connects the second negative pressure channel (4) and all the first negative pressure grooves (5).

6. A diaphragm leveling device for a pressure gauge according to claim 1, characterized in that, The negative pressure head (1) has a negative pressure nozzle (7) on the side away from the sealing gasket (3) that communicates with the first negative pressure channel (2).

7. A diaphragm leveling device for a pressure gauge according to claim 1, characterized in that, The negative pressure head (1) has an installation groove (8) that matches the shape of the sealing gasket (3) on the side near the sealing gasket (3), and a section of the sealing gasket (3) along the thickness direction is embedded in the installation groove (8).

8. A diaphragm leveling device for a pressure gauge according to claim 7, characterized in that, The sealing gasket (3) is made of rubber.

9. A diaphragm leveling device for a pressure gauge according to claim 8, characterized in that, The sealing gasket (3) is made of silicone rubber.

10. A diaphragm leveling device for a pressure gauge according to claim 8 or 9, characterized in that, The sealing gasket (3) is connected to the negative pressure head (1) by a self-tapping screw.

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