Novel cardia structure

Abstract

The utility model discloses a novel cardia structure which comprises a gas filtering cavity, gas filtering cotton and a mesh plate. According to the novel cardia structure, a gas filtering cavity is filled with gas filtering cotton, mesh plates are arranged on the upper side and the lower side of the gas filtering cotton and matched with the gas filtering cavity, an arc-shaped groove is formed in the circumference of the bottom of the gas filtering cavity, an arc-shaped part is arranged on the circumference of the edge of each mesh plate, and the arc-shaped parts correspond to and are matched with the arc-shaped grooves. The bottom face of the lower mesh plate is fixedly connected with a linear protrusion, the two mesh plates clamp the gas filtering cotton in the gas filtering cavity, the mesh plates can be placed in the gas filtering cavity through cooperation of the arc-shaped grooves and the arc-shaped parts, the arc-shaped parts and the arc-shaped grooves are staggered, the mesh plates are limited in the gas filtering cavity, and therefore the gas filtering cotton can be conveniently filtered. Therefore, more gas filtering cotton can be clamped and fixed in the gas filtering cavity, the gas filtering cotton can be tightly clamped, and meanwhile, the gas filtering cotton is prevented from protruding out of the gas filtering cavity or falling off from the gas filtering cavity.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical equipment accessories, in particular to a new cardia structure. Background Art

[0002] A vacuum pump is a device or apparatus that creates a vacuum by evacuating a container using mechanical, physical, chemical, or physicochemical methods. In existing technologies, rotary vane vacuum pumps are equipped with an intake valve, which acts as a check valve for airflow. To ensure a tight seal, a rubber ring is typically placed on the intake valve to enhance its sealing. To address oil return, existing technologies employ a check valve, a metal mesh layer to prevent oil backflow, and a seal within the vacuum pump opening. Furthermore, to address filtration issues, existing vacuum pump openings are also fitted with a filter. Considering both filtration and oil return simultaneously complicates the structure and increases assembly costs.

[0003] Patent document CN205423965U discloses a cardia structure comprising a first cardia portion, a second cardia portion, and an anti-oil return structure, wherein the first cardia portion is sealedly connected to the second cardia portion, the first cardia portion is provided with an air inlet and an active cavity communicating with the air inlet, the second cardia portion is provided with an air outlet, the anti-oil return structure is located within the active cavity, and the anti-oil return structure cover is located above the air inlet, the anti-oil return structure comprises a plug, a plug sealing ring, a plug spring, and a plug cover, the plug and the plug sealing ring are located within the plug cover, the plug spring is sleeved on the plug, one end of the plug spring abuts against the plug cover, and the plug cover is provided with an air vent and a piston hole. Compared with the prior art, the cardia structure of the present invention is installed between a vacuum pump and a container to be evacuated, thereby preventing both oil return and dust from entering the evacuated container, thereby improving the reliability of the operation process.

[0004] However, in the above-mentioned prior art, the gas filter cotton is directly filled in the inner cavity of the second cardia part, lacks fixation and compression, and a large gap is easily formed between the gas filter cotton and the inner cavity, which affects the filtering effect. At the same time, the gas filter cotton is also easy to be exposed from the bottom opening or even fall off. Therefore, a new cardia structure is proposed to optimize the above-mentioned prior art. Utility Model Content

[0005] The purpose of the present invention is to provide a novel cardia structure to solve the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A new type of cardia structure includes a first cardia portion and a second cardia portion, the second cardia portion is threadedly connected to the inner side of the top of the first cardia portion, the inner side of the top of the first cardia portion is provided with a threaded groove, the outer side of the bottom of the second cardia portion is provided with an external thread, the inner side of the bottom of the first cardia portion is provided with an active cavity, and the active cavity is provided with an anti-oil return mechanism adapted thereto, the bottom of the first cardia portion is provided with an air inlet, the top of the second cardia portion is provided with an air outlet, the air inlet is connected with the active cavity, the inner side of the second cardia portion is provided with a gas filter cavity, the air outlet is connected with the gas filter cavity, the gas filter cavity is filled with gas filter cotton, mesh plates are provided on the upper and lower sides of the gas filter cotton, the mesh plates are adapted to the gas filter cavity, the bottom circumference of the gas filter cavity is provided with an arc groove, the edge circumference of the mesh plate is provided with an arc portion, the arc portion corresponds to and adapts to the arc groove, and the bottom surface of the lower mesh plate is fixedly connected with a straight protrusion.

[0008] As a further solution of the present invention: a sealing ring is provided at the connection between the first cardiac portion and the second cardiac portion.

[0009] As a further solution of the present invention: the anti-oil backflow mechanism includes a plug cover, which is arranged on the outside of the inner mouth of the air inlet, and a first sealing gasket is provided between the bottom surface of the plug cover and the inner side of the bottom of the movable cavity, and a support ring is provided between the top surface of the plug cover and the bottom surface of the second cardia part, and the support ring is adapted to the movable cavity, and a second sealing gasket and a third sealing gasket are respectively provided between the support ring and the plug cover and between the support ring and the second cardia part.

[0010] As a further solution of the present invention: a piston hole is provided on the top of the plug cover, and an air vent is provided on the outer circumference of the plug cover corresponding to the piston hole. A plug that matches it is slidably connected to the inner side of the plug cover, and a plug sealing ring is fixedly connected to the bottom surface of the plug, which rests on the inner opening of the air inlet.

[0011] As a further solution of the present invention: the plug includes a first plugging part and a second plugging part, the first plugging part is provided with a breathable gap on the outer circumference corresponding to the plug sealing ring, the second plugging part includes a head and a skirt, the skirt is fixedly connected to the top surface of the first plugging part, the head is fixedly connected to the top surface of the skirt, and the head is inserted into the piston hole and slidably connected.

[0012] As a further solution of the present invention: the outer side of the second plugging portion is sleeved with a plug spring, and the plug spring is arranged between the first plugging portion and the top inner wall of the plug cover.

[0013] As a further solution of the present invention: a clamping groove is provided on the circumference of the gap of the arc groove corresponding to the bottom inner side of the gas filter chamber, and a clamping protrusion is provided on the corresponding arc portion of the mesh plate, and the clamping protrusion corresponds to and fits with the clamping groove.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. The utility model clamps the gas filter cotton in the gas filter chamber by two mesh plates. The mesh plate can be placed in the gas filter chamber by the cooperation of the arc groove and the arc portion. The mesh plate is confined in the gas filter chamber by the misalignment of the arc portion and the arc groove, so that more gas filter cotton can be clamped and fixed in the gas filter chamber, and the gas filter cotton can be clamped tightly, while preventing the gas filter cotton from protruding or falling from the gas filter chamber.

[0016] 2. The first sealing gasket in the present invention can play a certain elastic supporting role while playing a sealing role, so that the support ring and the plug cover can be tightly pressed against the movable cavity through the second cardiac part, forming an assembled installation combination effect, which is convenient for the disassembly, maintenance and assembly of the cardiac mechanism.

[0017] 3. The utility model can rotate the mesh plate through the straight protrusion, and the mesh plate can be placed and positioned through the cooperation of the slot shell and the protrusion, thereby increasing the stability of the placement of the mesh plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of a new cardia structure.

[0019] Figure 2 This is a disassembled display of the mesh plate and gas filter chamber in a new cardiac structure.

[0020] Figure 3 This is a diagram showing a plug in a new type of cardia structure.

[0021] In the figure: 1. First cardiac part; 2. Second cardiac part; 3. Movable cavity; 4. Anti-oil return mechanism; 5. Sealing ring; 6. Air inlet; 7. Air outlet; 8. Gas filter cavity; 9. Gas filter cotton; 10. Mesh plate; 11. Arc groove; 12. Arc part; 13. I-shaped protrusion; 14. Plug cover; 15. Snap-on protrusion; 16. First sealing gasket; 17. Support ring; 18. Second sealing gasket; 19. Third sealing gasket; 20. Piston hole; 21. Air vent; 22. Plug; 23. Plug sealing ring; 24. Plug spring; 25. Slot. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] See also Figures 1 to 3 In the embodiment of the present invention, a new cardiac structure includes a first cardiac portion 1 and a second cardiac portion 2. The second cardiac portion 2 is threadedly connected to the inner side of the top of the first cardiac portion 1. The inner side of the top of the first cardiac portion 1 is provided with a thread groove. The outer side of the bottom of the second cardiac portion 2 is provided with an external thread. The inner side of the bottom of the first cardiac portion 1 is provided with an active cavity 3. The active cavity 3 is provided with an anti-return oil mechanism 4 adapted thereto. The bottom of the first cardiac portion 1 is provided with an air inlet 6. The top of the second cardiac portion 2 is provided with an air outlet 7. The air inlet 6 It is connected to the active cavity 3, and a gas filter cavity 8 is provided on the inner side of the second cardia 2. The air outlet 7 is connected to the gas filter cavity 8. The gas filter cavity 8 is filled with gas filter cotton 9. The upper and lower sides of the gas filter cotton 9 are provided with mesh plates 10. The mesh plates 10 are adapted to the gas filter cavity 8. An arc groove 11 is provided on the bottom circumference of the gas filter cavity 8, and an arc portion 12 is provided on the edge circumference of the mesh plate 10. The arc portion 12 corresponds to and adapts to the arc groove 11. The bottom surface of the mesh plate 10 below is fixedly connected with a straight protrusion 13.

[0024] The gas filter cotton 9 is clamped in the gas filter chamber 8 by two mesh plates 10. The mesh plate 10 can be placed in the gas filter chamber 8 by the cooperation of the arc groove 11 and the arc portion 12. The mesh plate 10 is confined in the gas filter chamber 8 by the misalignment of the arc portion 12 and the arc groove 11, so that more gas filter cotton 9 can be clamped and fixed in the gas filter chamber 8, and the gas filter cotton can be clamped tightly, while preventing the gas filter cotton from protruding or falling from the gas filter chamber 8.

[0025] A sealing ring 5 is provided at the connection between the first cardiac portion 1 and the second cardiac portion 2 .

[0026] The anti-oil backflow mechanism 4 includes a plug cover 14, which is arranged on the outside of the inner opening of the air inlet 6. A first sealing gasket 16 is provided between the bottom surface of the plug cover 14 and the inner side of the bottom of the active cavity 3. A support ring 17 is provided between the top surface of the plug cover 14 and the bottom surface of the second cardia part 2. The support ring 17 is adapted to the active cavity 3. A second sealing gasket 18 and a third sealing gasket 19 are respectively provided between the support ring 17 and the plug cover 14 and between the support ring 17 and the second cardia part 2.

[0027] The sealing ring 5 is used to seal the connection between the first cardiac part 1 and the second cardiac part 2, the first sealing gasket 16 is used to seal the fitting surface between the plug cover 14 and the movable cavity 3, and the second sealing gasket 18 and the third sealing gasket 19 are used to seal the fitting surfaces between the support ring 17 and the plug cover 14 and between the support ring 17 and the second cardiac part 2, so that the overall cardiac structure has a good sealing effect.

[0028] The first sealing gasket 16 can play a certain elastic supporting role while playing a sealing role, so that the support ring 17 and the plug cover 14 can be tightly pressed against the movable cavity 3 through the second cardiac part 2, forming an assembled installation combination effect, which is convenient for the disassembly, maintenance and assembly of the cardiac mechanism.

[0029] A piston hole 20 is provided at the top of the plug cover 14, and an air vent 21 is provided on the outer circumference of the plug cover 14 corresponding to the piston hole 20. A plug 22 that matches it is slidably connected to the inner side of the plug cover 14, and a plug sealing ring 23 is fixedly connected to the bottom surface of the plug 22, which rests on the inner opening of the air inlet 6.

[0030] The plug 22 includes a first plugging part and a second plugging part. The first plugging part is provided with a breathable gap on the outer circumference corresponding to the plug sealing ring 23. The second plugging part includes a head and a skirt. The skirt is fixedly connected to the top surface of the first plugging part, and the head is fixedly connected to the top surface of the skirt. The head is inserted into the piston hole 20 and is slidably connected.

[0031] A plug spring 24 is sleeved on the outer side of the second plugging portion, and the plug spring 24 is arranged between the first plugging portion and the top inner wall of the plug cover 14 .

[0032] The plug 22 is pushed by the plug spring 24 so that the plug sealing ring 23 abuts against the inner opening of the air inlet 6, forming a backflow prevention effect.

[0033] A clamping groove 25 is provided on the inner side of the bottom of the gas filter chamber 8 at the circumference corresponding to the gap of the arc groove 11 , and a clamping protrusion 15 is provided on the corresponding arc portion 12 of the mesh plate 10 , which corresponds to and fits with the clamping groove 25 .

[0034] The mesh plate 10 can be rotated by the straight protrusion 13 , and the mesh plate 10 can be placed and positioned by the cooperation of the locking groove 25 and the locking protrusion 15 , thereby increasing the stability of the placement of the mesh plate 10 .

[0035] The working principle of this utility model is:

[0036] During use, the cardia structure provided by the present invention is installed between a vacuum pump and a container to be evacuated, with the air inlet 6 connected to the container to be evacuated and the air outlet 7 connected to the vacuum pump. When the vacuum pump starts working, the plug spring 24 in the anti-return oil mechanism 4 is acted upon by suction, driving the plug 22 and the plug sealing ring 23 to rise together. In other words, the first plug part slides upward along the inside of the plug cover 14, and the head of the second plug part extends out of the piston hole 20. At this point, the cardia structure forms a gas communication structure, and the gas in the container enters the anti-return oil mechanism 4 in the active chamber 3 and the gas filter cotton 9 in the gas filter chamber 8 in sequence through the air inlet 6, and is then evacuated through the air outlet 7. When the vacuum pump stops working, the plug spring 24 in the anti-oil return mechanism 4 returns to its original state, the plug 22 and the plug sealing ring 23 slide down together, and the plug sealing ring 23 seals the connection between the active chamber 3 and the air inlet 6, so that the oil flowing back from the vacuum pump is blocked in the cardia structure and does not flow into the container being evacuated.

[0037] When installing the gas filter cotton 9, a mesh plate 10 is placed in the gas filter chamber 8, and then the gas filter cotton 9 is filled. The gas filter cotton 9 is further pressed and another mesh plate 10 is placed. The gas filter cotton 9 is squeezed through the mesh plate 10, and the mesh plate 10 is rotated through the straight protrusion 13 so that the arc portion 12 is misaligned with the arc groove 11. At this time, the card groove 25 corresponds to the card protrusion 15. Under the reverse reset force of the gas filter cotton 9, the card protrusion 15 is inserted into the card groove 25 to form a limiting effect. The first sealing front 16 is further placed in the active cavity 3, and then the anti-oil return mechanism 4 is placed. The second sealing gasket 18 is further placed, and then the support ring 17 is placed, and then the third sealing gasket 19 is placed. Finally, the second cardia part 2 is placed on the first cardia part 1, thereby forming an assembly effect.

[0038] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A novel cardiac structure, comprising a first cardiac portion (1) and a second cardiac portion (2), characterized in that: The second cardiac portion (2) is threadedly connected to the inner side of the top of the first cardiac portion (1); the inner side of the bottom of the first cardiac portion (1) is provided with an active cavity (3); the active cavity (3) is provided with an anti-oil return mechanism (4) adapted thereto; the bottom of the first cardiac portion (1) is provided with an air inlet (6); the top of the second cardiac portion (2) is provided with an air outlet (7); the air inlet (6) is communicated with the active cavity (3); the inner side of the second cardiac portion (2) is provided with a gas filter cavity (8); the air outlet (7) is connected to the gas filter cavity (8); The filter chamber (8) is connected, and the gas filter chamber (8) is filled with gas filter cotton (9). The upper and lower sides of the gas filter cotton (9) are provided with mesh plates (10), and the mesh plates (10) are adapted to the gas filter chamber (8). The bottom circumference of the gas filter chamber (8) is provided with an arc groove (11), and the edge circumference of the mesh plate (10) is provided with an arc portion (12), and the arc portion (12) corresponds to and adapts to the arc groove (11). The bottom surface of the mesh plate (10) below is fixedly connected with a straight protrusion (13).

2. A novel cardiac structure according to claim 1, characterized in that: A sealing ring (5) is provided at the connection between the first cardiac portion (1) and the second cardiac portion (2).

3. The novel cardiac structure according to claim 1, characterized in that: The oil return prevention mechanism (4) comprises a plug cover (14), which is arranged on the outside of the inner opening of the air inlet (6), a first sealing gasket (16) is provided between the bottom surface of the plug cover (14) and the inner side of the bottom of the active cavity (3), a support ring (17) is provided between the top surface of the plug cover (14) and the bottom surface of the second cardiac portion (2), the support ring (17) is adapted to the active cavity (3), and a second sealing gasket (18) and a third sealing gasket (19) are provided between the support ring (17) and the plug cover (14), and between the support ring (17) and the second cardiac portion (2), respectively.

4. A novel cardiac structure according to claim 3, characterized in that: The top of the plug cover (14) is provided with a piston hole (20), and the outer circumference of the plug cover (14) corresponding to the piston hole (20) is provided with an air vent (21). The inner side of the plug cover (14) is slidably connected to a plug (22) adapted thereto, and the bottom surface of the plug (22) is fixedly connected to a plug sealing ring (23), which abuts against the inner opening of the air inlet (6).

5. A novel cardiac structure according to claim 4, characterized in that: The plug (22) includes a first plugging portion and a second plugging portion, the second plugging portion includes a head portion and a skirt portion, the skirt portion is fixedly connected to the top surface of the first plugging portion, the head portion is fixedly connected to the top surface of the skirt portion, and the head portion is inserted into the piston hole (20) and is slidably connected.

6. A novel cardiac structure according to claim 5, characterized in that: The outer side of the second plugging portion is sleeved with a plugging spring (24), and the plugging spring (24) is arranged between the first plugging portion and the top inner wall of the plug cover (14).

7. The novel cardiac structure according to claim 1, characterized in that: A clamping groove (25) is provided on the circumference of the gap between the arc-shaped groove (11) and the bottom inner side of the gas filter chamber (8); a clamping protrusion (15) is provided on the corresponding arc-shaped portion (12) of the mesh plate (10); and the clamping protrusion (15) corresponds to and fits with the clamping groove (25).

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