Pressure balancing structure for instrument

Abstract

The utility model belongs to the technical field of instrument pressure balancing, and particularly relates to a pressure balancing structure for an instrument, which comprises a fixed pipe connected with the instrument, a cover body connected with an upper opening of the fixed pipe, a threaded connecting part arranged at the lower part of the cover body and in threaded connection with the inner side of the fixed pipe, and a pressure balancing hole arranged at the middle part of the threaded connecting part, a metal particle sintering part is arranged in the pressure balance hole, the pressure balance hole is communicated with a capillary through hole above the metal particle sintering part, the capillary through hole is located in the upper portion of the cover body, the upper portion of the cover body is located above the fixing pipe, the capillary through hole is communicated with external atmospheric pressure, and an auxiliary constant pressure mechanism communicated with the pressure balance hole is arranged on the upper side of the cover body. According to the utility model, the structure is simple, the metal particle sintering part is combined with the capillary through holes, so that external and internal gases are communicated with each other, the pressure of an instrument is balanced, and dust and moisture entering the instrument can be reduced.

Description

Technical Field

[0001] This utility model belongs to the field of instrument pressure balancing technology, and specifically relates to a pressure balancing structure for instruments. Background Technology

[0002] Chinese patent CN222208979U discloses a pressure-balancing ventilated component for photoelectric instruments. It includes a fixed tube, a movable sleeve slidably mounted on the inner wall of the fixed tube, a venting assembly on the outside of the movable sleeve, the venting assembly including vent holes, a positioning plate on the front side of the movable sleeve, multiple fixing posts fixedly mounted on the side wall of the positioning plate near the movable sleeve, a positioning rod slidably mounted on the side wall of the positioning plate, a return spring sleeved on the front end of the side wall of the positioning rod, and a sealing plate fixedly mounted on the rear end of the side wall of the positioning rod. This invention fixes the fixed tube to the photoelectric instrument. When the movable sleeve slides back and forth, the air pressure inside the fixed tube changes, and the sealing plate moves with the air pressure change, connecting the fixed tube to the outside and restoring the internal air pressure of the fixed tube to normal. This solves the problem of existing venting tubes being constantly open.

[0003] However, in the existing technology, when adjusting the pressure of the instrument, it is necessary to make the inside of the fixed tube directly connected to the outside, which causes dust from the outside to enter the instrument when balancing the pressure, affecting the service life of the instrument. Utility Model Content

[0004] In view of the problems mentioned in the background art, the purpose of this utility model is to provide a pressure balancing structure for instruments to solve the problems mentioned in the background art.

[0005] To achieve the above technical objectives, the technical solution adopted by this utility model is as follows:

[0006] A pressure balancing structure for an instrument includes a fixed tube connected to the instrument. A cover is connected to the upper opening of the fixed tube. A threaded connection portion is provided at the lower part of the cover, which is threaded to the inner side of the fixed tube. A pressure balancing hole is provided in the middle of the threaded connection portion. A sintered metal particle is disposed within the pressure balancing hole. A capillary through-hole is connected above the sintered metal particle above the pressure balancing hole. The capillary through-hole is located at the upper part of the cover, which is above the fixed tube. The capillary through-hole is connected to external atmospheric pressure. An auxiliary constant pressure mechanism connected to the pressure balancing hole is provided on the upper side of the cover.

[0007] Further specifying, the sintered metal particle component is a sintered metal particle filter element or a sintered metal particle sheet.

[0008] Further limit, the auxiliary constant pressure mechanism includes constant pressure tank body, the sliding connection has pressure regulating plate in the constant pressure tank body, the upper portion of pressure regulating plate is connected with the elastic member fixedly connected with the upper side of constant pressure tank body, the middle part of constant pressure tank body is provided with the recess that is bent to the inside, when the elastic member is in the natural elongation state, the pressure regulating plate is slidably connected with the recess inside the middle part of constant pressure tank body, the upper side of elastic member is communicated with the outside.

[0009] Further limit, the number of capillary through holes is multiple, the outer end of capillary through hole is located at the upper edge side of cover body, the upper portion of cover body is rotatably connected with rotating ring for blocking the outer end of capillary through hole, rotating ring is provided with through hole, the central axis of rotating ring through hole and the central axis of capillary through hole are located in the same plane.

[0010] Further limit, the upper side of cover body is fixedly connected with the limiting piece of rotating ring, the upper portion of limiting piece is slidably connected with rotating ring.

[0011] Further limit, the constant pressure tank body is a rotating body.

[0012] Further limit, the elastic member includes spring, and the inside of spring is provided with telescopic column.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] The utility model discloses simple structure, through metal particle sintering piece and capillary through hole combination, make the gas of outside and inside intercommunication, thereby to the pressure of instrument is balanced, simultaneously capillary through hole can avoid the dust and moisture of outside to enter fixed pipe to some extent, reduced the possibility of instrument being contaminated.

[0015] The utility model discloses through setting up capillary through hole, can play more stable function effect, prolongs the service life of instrument relevant function.

[0016] The utility model discloses through setting up auxiliary constant pressure mechanism, can assist balancing the pressure in instrument, through this structure, when only in small range adjusting the pressure of instrument, pressure regulating plate only slides in small range, will not with recess inside separation, thereby effectively avoided the dust of outside to enter instrument;When needing greater range adjusting the pressure of instrument, pressure regulating plate continues to move, thereby realizes with outside air pressure balance.

[0017] The utility model discloses through setting up rotating ring, realizes manual control to capillary through hole and outside's intercommunication and close, can through to rotating ring rotation, shortens the time of single capillary through hole continuous work, thereby prolongs the service life of whole structure;When rotating ring closes all capillary through hole, auxiliary constant pressure mechanism can also work. ACCURACY OF THE DRAWINGS

[0018] The utility model can further illustrate through the non - limiting embodiment given by the drawings;

[0019] Figure 1 It is the structure schematic diagram of the utility model fixed pipe and cover body separation state structure schematic diagram;

[0020] Figure 2 It is the structure schematic diagram of the utility model fixed pipe and cover body separation state structure schematic diagram;

[0021] Figure 3 It is the structure schematic diagram of the utility model fixed pipe and cover body separation state structure schematic diagram;

[0022] Figure 4 It is the structure schematic diagram of the utility model fixed pipe and cover body separation state structure schematic diagram;

[0023] Figure 5 It is the structure schematic diagram of the utility model fixed pipe and cover body separation state structure schematic diagram;

[0024] Figure 6 It is the structure schematic diagram of the utility model fixed pipe and cover body separation state structure schematic diagram;

[0025] The main element symbol explanation is as follows:

[0026] Fixed pipe 1, cover body 2, connecting portion 21, balance hole 22, metal particle sintered member 23, capillary through hole 24;

[0027] Auxiliary constant pressure mechanism 3, constant pressure tank body 31, pressure regulating plate 32, elastic member 33, spring 331, telescopic column 332;

[0028] Rotary ring 4, limiting piece 5. Specific implementation

[0029] In order to make the person skilled in the art can better understand the utility model, the utility model technical scheme is further explained below in conjunction with the drawings and examples.

[0030] As Figures 1-6 Shown, a kind of pressure balance structure for instrument, including the fixed pipe 1 being connected with instrument, the upper opening of fixed pipe 1 is connected with cover body 2, the lower part of cover body 2 is provided with the threaded connection 21 being connected with the inside screw thread of fixed pipe 1, the middle part of threaded connection 21 is provided with pressure balance hole 22, metal particle sintered member 23 is arranged in pressure balance hole 22, pressure balance hole 22 is connected with capillary through hole 24 above metal particle sintered member 23, capillary through hole 24 is located in the upper portion of cover body 2, the upper portion of cover body 2 is located in the upper portion of fixed pipe 1, capillary through hole 24 is communicated with external atmospheric pressure, the upper side of cover body 2 is provided with auxiliary constant pressure mechanism 3 being communicated with pressure balance hole 22.

[0031] Need to be explained is that the capillary through hole refers to a very small channel or hole, the size of which is usually in the micron or nanometer level, and has a capillary effect; the fixed tube 1 is installed on the instrument, the cover 2 is threadedly connected with the fixed tube 1, and the cover 2 seals the upper opening of the fixed tube 1; the cover 2 can be removed from the fixed tube 1, so as to be separated from the fixed tube 1; the metal particle sintered part 23 is installed in the pressure balance hole 22, has a filtering function, the metal particle sintered part 23 built-in the part is connected with the atmospheric pressure through the capillary through hole 24 connected with the atmosphere, the metal particle sintered part 23 is an advanced filtering material made of metal powder through a high-temperature sintering process, and has the characteristics of high strength, high temperature resistance, corrosion resistance, good air permeability and cleaning regeneration capacity, and has the air permeability function; the capillary through hole has the characteristics of small diameter and long length, and has the waterproof and dustproof functions, so that the dust and water vapor in the outside world can be effectively prevented from entering the instrument; the metal particle sintered part 23 and the capillary through hole 24 are combined, the pressure of the instrument is kept constant, and the dust and water vapor in the outside world are prevented from entering the instrument, the auxiliary constant pressure mechanism 3 is used for assisting in balancing the pressure of the instrument, when the capillary through hole 24 is blocked and cannot work normally, the auxiliary constant pressure mechanism 3 can be combined with the metal particle sintered part 23 to adjust the pressure in the instrument.

[0032] The metal particle sintered part 23 is a metal particle sintered filter element or a metal particle sintered sheet. In the embodiment, the metal particle sintered part 23 is further limited.

[0033] Referring to Figure 1 and Figure 5The auxiliary constant pressure mechanism 3 comprises a constant pressure tank body 31, a pressure regulating plate 32 is slidably connected in the constant pressure tank body 31, the upper portion of the pressure regulating plate 32 is connected with an elastic member 33 fixedly connected with the upper side of the constant pressure tank body 31, and a concave platform is arranged in the middle portion of the constant pressure tank body 31 and is bent inwardly; when the elastic member 33 is in a natural elongation state, the pressure regulating plate 32 is slidably and sealingly connected with the inner side of the concave platform in the middle portion of the constant pressure tank body 31, and the upper side of the elastic member 33 is communicated with the outside; in the embodiment, the constant pressure tank body 31 is communicated with the outside and the cover body 2, and the pressure regulating plate 32 is used for dividing the constant pressure tank body 31 into two cavities; when the pressures in the two cavities are the same, the elastic member 133 is located on the inner side of the concave platform of the constant pressure tank body 31, so that the air outside is prevented from entering the constant pressure tank body 31; when the pressure in the instrument is relatively large, the pressure of the constant pressure tank body 31 is increased, so that the pressure regulating plate 32 is moved upward along the inner side of the concave platform, thereby reducing the pressure by increasing the volume; when the pressure still cannot be balanced, the pressure regulating plate 32 is continuously moved upward, so that the pressure regulating plate 32 and the bent region of the constant pressure tank body 31 leave a gap, so that the gas in the lower portion of the constant pressure tank body 31 is discharged to balance the pressure of the instrument; when the pressure in the instrument is relatively small, the pressure regulating plate 32 is moved downward along the inner side of the concave platform to balance the pressure in the manner of reducing the volume; when the pressure still cannot be balanced, the pressure regulating plate 32 is continuously moved downward under the action of the force generated by the pressure, so that the pressure regulating plate 32 and the inner side of the bent portion of the constant pressure tank body 31 leave a gap, and the air outside enters the constant pressure tank body 31; when the pressures on both sides of the pressure regulating plate 32 are balanced, the pressure regulating plate 32 returns to the initial position to isolate the upper cavity and the lower portion of the constant pressure tank body 31; through the structure, when the pressure of the instrument is adjusted only in a small range, the pressure regulating plate 32 only slides in a small range and does not separate from the inner side of the concave platform, so that the dust outside is effectively prevented from entering the instrument.

[0034] With reference to Figure 3 And Figure 5 The number of the capillary through holes 24 is multiple, the outer ends of the capillary through holes 24 are located on the upper edge side of the cover body 2, a rotating ring 4 for blocking the outer ends of the capillary through holes 24 is rotatably connected with the upper portion of the cover body 2, the rotating ring 4 is provided with a through hole, and the central axis of the through hole of the rotating ring 4 and the central axis of the capillary through hole 24 are located on the same plane; through the arrangement of multiple capillary through holes 24, the through hole is aligned with the outlet of the capillary through hole 24 by rotating the rotating ring 4, the capillary through hole 24 is closed when the through hole of the rotating ring 4 is rotated to other positions, thereby reducing the working time of a single capillary through hole 24, and when a capillary through hole 24 cannot be used any more, other capillary through holes 24 can be used by rotating the rotating ring 4 to the positions of the other capillary through holes 24, thereby prolonging the overall use time.

[0035] With reference to Figure 1 And Figure 5The upper side of the cover 2 is fixedly connected with a limiting piece 5 of the rotating ring 4, and the upper part of the lower side of the limiting piece 5 is slidably connected with the rotating ring 4. In the embodiment, the limiting piece 5 is used for limiting the upward movement of the rotating ring 4.

[0036] With reference to Figure 1 The constant pressure tank body 31 is a rotating body. In the embodiment, the constant pressure tank body 31 is preferably a rotating body, and can also be other square bodies with a recessed table inwardly retracted in the middle part. The pressure adjusting plate 32 is matched with the shape of the recessed table formed by the middle part retraction of the constant pressure tank body 31.

[0037] With reference to Figure 5 The elastic piece 33 comprises a spring 331, and the inner side of the spring 331 is provided with a telescopic column 332. The elastic piece 33 is preferably a spring, and the telescopic column 332 is used for keeping the pressure adjusting plate 32 only vertically movable.

[0038] The above embodiment only exemplarily illustrates the principle and effect of the utility model, and is not used for limiting the utility model. Any person skilled in the art can modify or change the above embodiment without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought of the utility model should be covered by the claims of the utility model.

Claims

1. A pressure equalization structure for an instrument comprising a stationary tube (1) connected to the instrument, characterized in that: The upper opening of the fixed pipe (1) is connected with a cover (2), the lower part of the cover (2) is provided with a threaded connection part (21) which is screwed with the inside of the fixed pipe (1), the middle part of the threaded connection part (21) is provided with a pressure balance hole (22), the pressure balance hole (22) is provided with a metal particle sintering part (23), the pressure balance hole (22) is communicated with a capillary through hole (24) above the metal particle sintering part (23), the capillary through hole (24) is located at the upper part of the cover (2), the upper part of the cover (2) is located above the fixed pipe (1), the capillary through hole (24) is communicated with the external atmospheric pressure, the upper side of the cover (2) is provided with an auxiliary constant pressure mechanism (3) which is communicated with the pressure balance hole (22).

2. A pressure equalizing structure for an instrument according to claim 1, characterized by: The metal particle sintering part (23) is a metal particle sintering filter element or a metal particle sintering sheet.

3. A pressure equalizing structure for an instrument according to claim 1, characterized by: The auxiliary constant pressure mechanism (3) comprises a constant pressure tank body (31), a pressure regulating plate (32) is slidably connected in the constant pressure tank body (31), the upper part of the pressure regulating plate (32) is connected with an elastic element (33) which is fixedly connected with the upper side of the constant pressure tank body (31), the middle part of the constant pressure tank body (31) is provided with a concave platform which is bent inward, when the elastic element (33) is in a natural elongation state, the pressure regulating plate (32) is slidably and sealingly connected with the inside of the concave platform of the middle part of the constant pressure tank body (31), the upper side of the elastic element (33) is communicated with the outside.

4. A pressure equalizing structure for an instrument according to claim 3, characterized by: The number of the capillary through holes (24) is multiple, the outer ends of the capillary through holes (24) are located at the upper edge side of the cover (2), a rotating ring (4) which is used for blocking the outer ends of the capillary through holes (24) is rotatably connected with the upper part of the cover (2), the rotating ring (4) is provided with a through hole, the central axis of the through hole of the rotating ring (4) is located in the same plane with the central axis of the capillary through hole (24).

5. A pressure equalisation structure for an instrument according to claim 4, wherein: The upper side of the cover (2) is fixedly connected with a limiting part (5) of the rotating ring (4), the upper part of the limiting part (5) is slidably connected with the rotating ring (4).

6. A pressure equalizing structure for an instrument according to claim 4, wherein: The constant pressure tank body (31) is a rotating body.

7. A pressure equalizing structure for an instrument according to claim 3, wherein: The elastic element (33) comprises a spring (331), the inside of the spring (331) is provided with a telescopic column (332).

Images