Dustproof ventilation device for pressure gauge

Abstract

The utility model discloses a dustproof ventilation device for a pressure gauge, which is used for decompressing the pressure gauge, an oil filling port is arranged on the side wall of the pressure gauge, an internal thread is arranged on the side wall of the oil filling port, the dustproof ventilation device comprises a base, a chock plug, an upper cover, a mounting mechanism, a plugging mechanism and a ventilation port, a conical sealing groove is arranged on the base, the chock plug is fixedly arranged on the base, and the upper cover is arranged on the upper cover. An air channel is formed in the plug, the air channel is communicated with the sealing groove, the plug is matched with the oil filling opening in shape, external threads are arranged on the side wall of the plug, the upper cover is arranged on one side of the base, the mounting mechanism is arranged on the upper cover and used for mounting and fixing the upper cover and the base, the blocking mechanism is arranged on the upper cover and used for blocking the sealing groove, and the ventilation opening is arranged to be in an L shape. According to the dustproof ventilation device for the pressure gauge, pressure relief of the pressure gauge can be conveniently achieved through movement of the plug, and then the problem that in the prior art, the pressure relief effect in the pressure gauge is poor is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure gauges, and particularly relates to a dust-proof ventilation device for a pressure gauge. Background Art

[0002] In order to ensure the normal operation of each component inside the pressure gauge case, it is necessary to inject lubricating oil into the case in a timely manner. Generally, lubricating oil can be injected into the pressure gauge through the oil filling port. Since the working conditions of the pressure gauge are relatively harsh, in order to prevent dust in the surrounding environment from entering the case through the oil filling port, those skilled in the art usually use a plug to block the oil filling port. However, if the oil filling port is blocked, the inside of the pressure gauge will be isolated from the outside atmosphere. At high temperatures, the pressure inside the pressure gauge may increase, which may cause the elastic element to deform, resulting in a deviation in the pressure measurement value of the pressure gauge.

[0003] In order to facilitate the pressure relief inside the pressure gauge, after searching, the utility model patent with the authorization announcement number of CN218646500U discloses a dust-proof ventilation device for a pressure gauge and a pressure gauge, including an oil filling pin. The oil filling pin includes a pin body and a pin head. The pin body is used to block the oil filling port on the case. An oil filling pin air passage is formed inside the oil filling pin, and the oil filling pin air passage is communicated with the inside of the case. The above-mentioned dust-proof ventilation device for a pressure gauge not only has the effect of ventilation, but also has the effects of waterproof and dust-proof.

[0004] However, in the above-mentioned prior art, the oil filling pin is of an integral structure. If impurities enter its interior, it is very inconvenient to clean. At the same time, it is necessary to ensure a reasonable gap between the oil filling pin and the dust-proof cap, which has high assembly requirements and is likely to affect the pressure relief effect due to assembly errors. Summary of the Utility Model

[0005] (1) Technical Problems to be Solved

[0006] Aiming at the deficiencies of the prior art, the utility model provides a dust-proof ventilation device for a pressure gauge to solve the problem of poor pressure relief effect inside the prior art pressure gauge as proposed in the background art.

[0007] (2) Technical Solutions

[0008] To achieve the above object, the present utility model provides the following technical solutions: A pressure gauge dust-proof ventilation device is used to relieve pressure on the pressure gauge. An oil filling port is provided on the side wall of the pressure gauge, and an internal thread is provided on the side wall of the oil filling port. It includes a base, a plug, an upper cover, an installation mechanism, a sealing mechanism, and a ventilation port. A conical sealing groove is provided on the base, the plug is fixedly arranged on the base, an air passage is provided on the plug, the air passage is communicated with the sealing groove, the plug is adapted to the shape of the oil filling port, an external thread is provided on the side wall of the plug, the upper cover is arranged on one side of the base, the installation mechanism is arranged on the upper cover for installing and fixing between the upper cover and the base, the sealing mechanism is arranged on the upper cover for sealing the sealing groove, the ventilation port is L-shaped, the ventilation port is provided on the side wall of the upper cover, the ventilation port is communicated with the sealing groove, and a filter screen is arranged inside the ventilation port.

[0009] Preferably, the sealing mechanism includes:

[0010] A first cavity is provided in the upper cover, and a support port is provided on the inner bottom wall of the first cavity;

[0011] A support column is slidably arranged in the support port. A plug and a support plate are respectively fixedly arranged at both ends of the support column. The support plate is slidably connected with the side wall of the first cavity, and the plug is in contact with the side wall of the sealing groove;

[0012] A support spring is sleeved on the support column, and both ends of the support spring are respectively fixedly connected with the plug and the side wall of the upper cover.

[0013] Furthermore, the installation mechanism includes:

[0014] Installation grooves are provided on the base, and annular grooves are provided on the side walls of the installation grooves;

[0015] Installation columns are fixedly arranged on the upper cover. A plurality of the installation columns correspond to the installation grooves one by one, and a plurality of positioning grooves are provided on the side walls of the installation columns;

[0016] A first gear is rotatably arranged in the positioning groove, and a positioning block is fixedly arranged on the side wall of the first gear;

[0017] A synchronous rotation mechanism is arranged in the installation column for controlling the synchronous rotation of a plurality of the first gears.

[0018] Still further, the synchronous rotation mechanism includes:

[0019] The second cavity is opened in the mounting post, and the second cavity communicates with the positioning groove;

[0020] The second gear is rotatably arranged in the second cavity, and the second gear meshes with the first gear;

[0021] The third cavity is opened on one side of the first cavity. A plurality of third gears are rotatably arranged in the third cavity, and a connecting rod is fixedly arranged between the third gear and the second gear;

[0022] The driving mechanism is arranged on the upper cover and is used to control the synchronous rotation of the plurality of third gears.

[0023] Furthermore, the driving mechanism includes:

[0024] The fourth gear is rotatably arranged in the third cavity, and the fourth gear meshes with the third gear;

[0025] The handwheel is rotatably arranged on the upper cover, and a driving rod is fixedly arranged between the handwheel and the fourth gear.

[0026] On the basis of the above solution, a reset groove is opened on the upper cover. The driving rod penetrates through the reset groove, and a torsion spring is sleeved on the driving rod. Two ends of the torsion spring are respectively fixedly connected with the bottom of the reset groove and the handwheel.

[0027] (III) Beneficial effects

[0028] Compared with the prior art, the present utility model provides a pressure gauge dust-proof ventilation device, which has the following

[0029] beneficial effects:

[0030] 1. In the present utility model, through the arrangement of the installation mechanism, an operator can rotate the handwheel to drive the driving rod and the fourth gear to rotate. At the same time, through the meshing of the fourth gear and the third gear, the third gear, the connecting rod and the second gear are driven to rotate. Furthermore, through the meshing of the second gear and the first gear, the first gear is driven to rotate. During the rotation of the first gear, the positioning block can be controlled to extend or retract into the positioning groove, and then through the cooperation of the positioning block and the annular groove, the installation and fixation between the upper cover and the base are realized;

[0031] 2. In the present utility model, through the arrangement of the plugging mechanism, after the installation between the upper cover and the base is completed, the plug can be pressed against the side wall of the sealing groove under the action of the supporting spring. When the pressure inside the pressure gauge is too high, the pressure of the gas will compress the supporting spring, and then the plug will move upward, so that the air pressure inside the pressure gauge leaks out through the vent hole, avoiding deformation of the elastic element caused by excessive pressure inside the pressure gauge. When the air pressure in the working environment is high, the supporting spring will be stretched, and the plug will block the sealing groove to prevent external gas from entering the pressure gauge, thus ensuring the normal operation of the pressure gauge;

[0032] 3. In the present utility model, through the arrangement of the base, the plug, the upper cover, the installation mechanism, the plugging mechanism and the vent hole, it is convenient to realize the pressure relief of the pressure gauge through the movement of the plug, thereby solving the problem of poor pressure relief effect inside the pressure gauge in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic structural diagram of the present application;

[0034] Figure 2 is a schematic structural diagram of another perspective of the present application;

[0035] Figure 3 is a partial sectional structural schematic diagram of the present application after decomposition;

[0036] Figure 4 is a sectional structural schematic diagram of the upper cover of the present application;

[0037] Figure 5 is a sectional structural schematic diagram of the installation mechanism of the present application.

[0038] In the figure: 1, base; 2, sealing groove; 3, plug; 4, air passage; 5, upper cover; 6, vent hole; 7, support column; 8, plug; 9, support plate; 10, support spring; 11, installation groove; 12, installation post; 13, first gear; 14, positioning block; 15, second gear; 16, third cavity; 17, third gear; 18, fourth gear; 19, handwheel; 20, drive rod; 21, reset groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0040] Please refer to Figures 1-5, a pressure gauge dust-proof ventilation device for relieving pressure of the pressure gauge. An oil filling port is provided on the side wall of the pressure gauge, and an internal thread is provided on the side wall of the oil filling port. It includes a base 1, a plug 3, an upper cover 5, an installation mechanism, a plugging mechanism, and a ventilation port 6. A conical sealing groove 2 is provided on the base 1. The plug 3 is fixedly arranged on the base 1. An air passage 4 is provided on the plug 3, and the air passage 4 communicates with the sealing groove 2. The plug 3 is adapted to the shape of the oil filling port, and an external thread is provided on the side wall of the plug 3. The upper cover 5 is arranged on one side of the base 1. The installation mechanism is arranged on the upper cover 5 for installing and fixing between the upper cover 5 and the base 1. The plugging mechanism is arranged on the upper cover 5 for plugging the sealing groove 2. The ventilation port 6 is L-shaped and is provided on the side wall of the upper cover 5. The ventilation port 6 communicates with the sealing groove 2, and a filter screen is arranged inside the ventilation port 6.

[0041] Refer to Figures 3-5 , the plugging mechanism includes a first cavity, a support column 7, and a support spring 10. The first cavity is provided inside the upper cover 5. A support port is provided on the inner bottom wall of the first cavity. The support column 7 is slidably arranged in the support port. A plug 8 and a support plate 9 are fixedly arranged at both ends of the support column 7 respectively. The support plate 9 is slidably connected with the side wall of the first cavity. The plug 8 contacts the side wall of the sealing groove 2. The support spring 10 is sleeved on the support column 7, and both ends of the support spring 10 are fixedly connected with the plug 8 and the side wall of the upper cover 5 respectively.

[0042] Specifically, after the installation between the upper cover 5 and the base 1 is completed, the plug can be pressed against the side wall of the sealing groove 2 under the action of the support spring 10. When the pressure inside the pressure gauge is too high, the gas pressure will compress the support spring 10, and then the plug 8 will move upward, so that the air pressure inside the pressure gauge will leak out through the ventilation port 6, avoiding deformation of the elastic element caused by excessive pressure inside the pressure gauge. When the air pressure in the working environment is relatively high, the support spring 10 will be stretched, and the plug 8 and the sealing groove 2 will be blocked to prevent external gas from entering the pressure gauge, thus ensuring the normal operation of the pressure gauge.

[0043] Refer to Figures 4-5, the installation mechanism includes an installation groove 11, an installation post 12, a first gear 13, and a synchronous rotation mechanism. A plurality of installation grooves 11 are formed in the base 1. An annular groove is formed in the side wall of the installation groove 11. A plurality of installation posts 12 are fixedly arranged on the upper cover 5. The plurality of installation posts 12 correspond to the installation grooves 11 one by one. A plurality of positioning grooves are formed in the side wall of the installation post 12. The first gear 13 is rotatably arranged in the positioning groove. A positioning block 14 is fixedly arranged on the side wall of the first gear 13. The synchronous rotation mechanism is arranged in the installation post 12 and is used to control the synchronous rotation of the plurality of first gears 13. The synchronous rotation mechanism includes a second cavity, a second gear 15, a third cavity 16, and a driving mechanism. The second cavity is formed in the installation post 12 and is communicated with the positioning groove. The second gear 15 is rotatably arranged in the second cavity. The second gear 15 is meshed with the first gear 13. The third cavity 16 is formed on one side of the first cavity. A plurality of third gears 17 are rotatably arranged in the third cavity 16. A connecting rod is fixedly arranged between the third gear 17 and the second gear 15. The driving mechanism is arranged on the upper cover 5 and is used to control the synchronous rotation of the plurality of third gears 17.

[0044] Specifically, after the installation post 12 is inserted into the installation groove 11, the rotation of the third gear 17 can be driven by the operation of the driving mechanism. At the same time, the second gear 15 is driven to rotate through the connecting rod, and then the first gear 13 is driven to rotate through the meshing of the second gear 15 and the first gear 13, so that the positioning block 14 can move around the first gear 13. During the movement of the positioning block 14, the positioning between the installation post 12 and the installation groove 11 can be realized through the cooperation between the positioning block 14 and the side wall of the annular groove, and then the installation and fixation between the upper cover 5 and the base 1 can be realized.

[0045] Refer to Figure 4 And Figure 5 , the driving mechanism includes a fourth gear 18 and a handwheel 19. The fourth gear 18 is rotatably arranged in the third cavity 16. The fourth gear 18 is meshed with the third gear 17. The handwheel 19 is rotatably arranged on the upper cover 5. A driving rod 20 is fixedly arranged between the handwheel 19 and the fourth gear 18. A reset groove 21 is formed in the upper cover 5. The driving rod 20 penetrates through the reset groove 21. A torsion spring is sleeved on the driving rod 20. The two ends of the torsion spring are respectively fixedly connected with the bottom of the reset groove 21 and the handwheel 19.

[0046] Specifically, when the operator rotates the handwheel 19, the driving rod 20 and the fourth gear 18 can be driven to rotate. At the same time, the third gear 17, the connecting rod, and the second gear 15 are driven to rotate through the meshing of the fourth gear 18 and the third gear 17.

[0047] In summary, during use, the operator rotates the handwheel 19, which can drive the drive rod 20 and the fourth gear 18 to rotate. At the same time, through the meshing of the fourth gear 18 and the third gear 17, the third gear 17, the connecting rod, and the second gear 15 are driven to rotate. Then, through the meshing of the second gear 15 and the first gear 13, the first gear 13 is driven to rotate. During the rotation of the first gear 13, the positioning block 14 can be controlled to retract into the positioning groove. After that, the operator inserts the mounting post 12 into the mounting groove 11 and releases the handwheel 19. The fourth gear 18 and the drive rod 20 can be reset under the action of the torsion spring, so that the positioning block 14 extends into the annular groove. At this time, the positioning between the mounting post 12 and the mounting groove 11 is realized through the cooperation of the positioning block 14 and the side wall of the annular groove, thereby realizing the installation and fixation of the upper cover 5 and the base 1. After the installation between the upper cover 5 and the base 1 is completed, the plug block can be pressed against the side wall of the sealing groove 2 under the action of the support spring 10. When the pressure in the pressure gauge is too high, the gas pressure will compress the support spring 10, and then the plug 8 will move upward, so that the air pressure in the pressure gauge leaks out through the vent hole 6, avoiding deformation of the elastic element due to excessive pressure inside the pressure gauge. When the air pressure in the working environment is relatively high, the support spring 10 will be stretched, and the plug 8 will block the sealing groove 2, preventing external gas from entering the pressure gauge, thus ensuring the normal operation of the pressure gauge.

[0048] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dust-proof ventilation device for a pressure gauge, which is used to relieve pressure of the pressure gauge. An oil filling port is provided on the side wall of the pressure gauge, and it is characterized in that, Comprising: A base (1), on which a conical sealing groove (2) is formed; A plug (3) fixedly arranged on the base (1), with an air passage (4) formed on the plug (3), the air passage (4) communicating with the sealing groove (2), and the plug (3) being adapted to the shape of the oil filling port; An upper cover (5) arranged on one side of the base (1); An installation mechanism arranged on the upper cover (5) for installing and fixing between the upper cover (5) and the base (1); A plugging mechanism arranged on the upper cover (5) for plugging the sealing groove (2); An air vent (6) which is L-shaped, formed on the side wall of the upper cover (5), the air vent (6) communicating with the sealing groove (2), and a filter screen being arranged inside the air vent (6).

2. The dust-proof ventilation device for a pressure gauge according to claim 1, wherein, The plugging mechanism comprises: A first cavity formed inside the upper cover (5), with a support opening formed on the inner bottom wall of the first cavity; A support column (7) slidably arranged in the support opening, with a plug (8) and a support plate (9) respectively fixedly arranged at both ends of the support column (7), the support plate (9) being slidably connected to the side wall of the first cavity, and the plug (8) being in contact with the side wall of the sealing groove (2); A support spring (10) sleeved on the support column (7), with both ends of the support spring (10) respectively fixedly connected to the plug (8) and the side wall of the upper cover (5).

3. The dust-proof ventilation device for a pressure gauge according to claim 2, characterized in that, The installation mechanism comprises: Installation grooves (11) formed on the base (1), with annular grooves formed on the side walls of the installation grooves (11); Installation posts (12) fixedly arranged on the upper cover (5), a plurality of the installation posts (12) corresponding to the installation grooves (11) one by one, and a plurality of positioning grooves formed on the side walls of the installation posts (12); A first gear (13) rotatably arranged in the positioning groove, with a positioning block (14) fixedly arranged on the side wall of the first gear (13); A synchronous rotation mechanism arranged inside the installation post (12) for controlling synchronous rotation of a plurality of the first gears (13).

4. The dust-proof ventilation device for a pressure gauge according to claim 3, characterized in that, The synchronous rotation mechanism comprises: A second cavity formed inside the installation post (12), the second cavity communicating with the positioning groove; A second gear (15) rotatably arranged in the second cavity, the second gear (15) meshing with the first gear (13); A third cavity (16) formed on one side of the first cavity, with a plurality of third gears (17) rotatably arranged inside the third cavity (16), and a connecting rod being fixedly arranged between the third gears (17) and the second gear (15); A driving mechanism, which is arranged on the upper cover (5) and is used to control the synchronous rotation of a plurality of the third gears (17).

5. The dust-proof ventilation device for a pressure gauge according to claim 4, characterized in that, The driving mechanism includes: A fourth gear (18), which is rotatably arranged in the third cavity (16), and the fourth gear (18) is meshed with the third gear (17); A handwheel (19), which is rotatably arranged on the upper cover (5), and a driving rod (20) is fixedly arranged between the handwheel (19) and the fourth gear (18).

6. A pressure gauge dust-proof ventilation device according to claim 5, characterized in that, A reset groove (21) is formed on the upper cover (5), the driving rod (20) penetrates through the reset groove (21), a torsion spring is sleeved on the driving rod (20), and two ends of the torsion spring are respectively fixedly connected with the bottom of the reset groove (21) and the handwheel (19).

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