CN105179870A - Vacuum seal plug - Google Patents

Abstract

The invention discloses a vacuum sealing plug, which includes a hexagonal plug, an O-shaped sealing ring, and a plunger sealing ring. The hexagonal plug includes a hexagonal nut structure with an open upper end, and cylinders are added to the upper and lower ends of the hexagonal nut structure. part, the lower cylindrical part is a solid cylinder and a sealing groove with a smooth bottom is opened in the lower cylindrical part, the upper cylindrical part is a hollow structure, and the hexagonal nut structure is provided with a sealing column, and the hexagonal nut structure is integrated with the cylindrical part and the sealing column , the O-shaped sealing ring is set on the lower end of the sealing column and is in contact with the lower inner wall of the sealing groove of the hexagonal plug, the plunger sealing ring is set on the sealing column and the lower end of the plunger sealing ring is against the O-ring, Internal threads are provided on the inner wall of the hexagonal nut structure, and the hexagonal plug is connected with the threaded connector through the internal threads. The invention has the advantages of small volume, convenient and trouble-free operation, common material and low cost, and can achieve good vacuum sealing effect.

Description

A vacuum sealing plug

technical field

The invention relates to the field of vacuum sealing, in particular to a vacuum sealing plug.

Background technique

The plug is a kind of thing that blocks the unnecessary opening in the pipeline and plays a sealing role. It is the same as blind plate, head and pipe cap.

During the installation and construction of a vacuum device, depending on the requirements of the vacuum degree and the degree of sophistication and complexity of the device, the installation of a device has to go through many leak tests, especially for high-vacuum precision devices. There are many open pipes on the surface of the vacuum chamber of some devices and the threaded joints welded together with them. Due to the needs of installation and leak detection, the outlet threaded joints are delayed until the end. In the process of leak detection, the outlet needs to be welded and cut again and again, and the cutting process must be very careful. First, try to avoid chips entering the pipeline, and second, prevent the weld seam connecting the pipeline and the vacuum chamber. leak. It is very troublesome to get it down like this, not to mention time-consuming and labor-intensive, and it is easy to delay the installation progress. The pipe joints are made ugly, which also increases the leak point of vacuum leaks, and the threaded joints are easy to damage the threads during the process of waiting for installation.

Just need a kind of simple and convenient vacuum sealing device like this, seal outlet, thereby solve above troublesome thing, and existing sealing device is difficult to meet this requirement.

Contents of the invention

The purpose of the present invention is to provide a vacuum sealing plug to seal the outlet of the pipeline, thereby facilitating the leak detection process, speeding up the installation progress, and simultaneously protecting the outlet pipeline, joint welds and joints.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A vacuum sealing plug, characterized in that: it includes a hexagonal plug, an O-ring, and a plunger sealing ring, the hexagonal plug includes a hexagonal nut structure, and the upper and lower ends of the hexagonal nut structure are respectively provided with cylinders part, the lower cylindrical part is a solid cylinder and a sealing groove with a smooth bottom is opened in the lower cylindrical part, the upper cylindrical part is a hollow structure, and a sealing column is arranged in the hexagonal nut structure, and the hexagonal nut structure is integrated with the cylindrical part and the sealing column , the O-shaped sealing ring is set on the lower end of the sealing column and contacts the inner wall of the lower end of the sealing groove of the hexagonal plug, the plunger sealing ring is set on the sealing column and the lower end of the plunger sealing ring is against the O-ring, The inner wall of the hexagonal nut structure of the plug is provided with internal threads, and the hexagonal plug is connected with the threaded connector through the internal threads.

The above-mentioned vacuum sealing plug is characterized in that: the sealing column is a cylinder with a smooth surface and a narrow top and a wide bottom with a certain taper, which is the main body of the seal.

The above-mentioned vacuum sealing plug is characterized in that: the plunger sealing ring is a stepped cylinder as a whole, and a through hole with a narrow top and a wide bottom is opened in the center with a certain taper, and the taper is smaller than that of the sealing column.

The above-mentioned vacuum sealing plug is characterized in that: the top of the sealing column is provided with chamfers, so as to be inserted into the inner cavity of the threaded joint, and it is fitted together with the plunger sealing ring to form the main sealing part.

Compared with ordinary seals, it has multiple sealing safety structures. First of all, the diameter of the outer upper cylinder of the plunger sealing ring of the present invention is slightly smaller than the diameter of the inner cavity of the threaded connection head, and the diameter of the through hole at the bottom is slightly larger than the diameter of the top of the sealing column, so that the sealing column will gradually expand the plunger as the thread is screwed in. The sealing ring is such that the outer surface of the plunger sealing ring is in close contact with the inner cavity of the threaded connector to form a first sealing surface, and at the same time, the upper end surface of the stepped cylinder at the bottom of the plunger sealing ring is in close contact with the top of the threaded connector to form a second sealing surface. The tapered surface of the sealing column is in close contact with the tapered surface of the through hole of the plunger sealing ring to form a third sealing surface seal. The diameter of the smallest circle inside the O-ring is smaller than the diameter of the bottom of the sealing column, so that the O-ring can fit tightly with the sealing column without contacting the bottom end surface of the inner cavity of the hexagonal plug; in this way, as the thread is continuously screwed in, The sealing column continuously expands the plunger, so that the three sealing surfaces mentioned above are sealed more tightly, and at the same time, the connector is driven to continuously squeeze the plunger downward, so that the lower end of the plunger sealing ring squeezes the O-ring It constitutes the fourth sealing surface; the O-ring is closely attached to the sealing column to form the fifth sealing surface. The O-ring squeezes the sealing groove to form the sixth sealing surface. Generally, the first and third seals are the primary seals, and the other seals are generally on standby. When there is a problem with the main seal, the other seals will cooperate with the main seal to form a multi-sealing insurance structure and play a good role in vacuum sealing. If vacuum grease is applied to all the above-mentioned contact surfaces, the vacuum sealing effect can be the best.

The material of hexagonal plug, sealing column, plunger seal ring and O-ring seal ring can be selected according to actual needs. The structure is simple, the cost is low, the work is stable and reliable, and the installation and disassembly are convenient and simple to use. It can achieve a very good vacuum seal. As a result, higher pressure can also be achieved in pressure leak detection.

The present invention has the following advantages:

The invention is small in size, convenient and trouble-free in operation, common in materials, and low in cost. The sealing column, plunger sealing ring and O-shaped sealing ring form a multiple vacuum sealing structure, which can achieve a good vacuum sealing effect, and the vacuum sealing safety factor is high. Higher pressure can be achieved in leak detection, the work safety factor is high, the leak detection results are more reliable, and the threads and welds are protected at the same time.

Description of drawings

Figure 1 is a working sectional view of the present invention.

Fig. 2 is a schematic cross-sectional view of the assembly of the present invention.

Fig. 3 is a structural schematic diagram of the present invention.

Fig. 4 is a structural sectional view of the present invention.

Explanation of reference signs: hexagonal plug 1, hexagonal nut structure 1-1, cylindrical part 1-2, sealing groove 1-3, O-shaped sealing ring 2, plunger sealing ring 3, sealing column 4, threaded connector 5.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the present invention will be described in further detail

Please refer to Figures 2, 3, and 4: a vacuum sealing plug, including a hexagonal plug 1, an O-ring 2, and a plunger sealing ring 3. The hexagonal plug 1 is made of stainless steel as a whole. Of course, it can be replaced with other materials according to individual requirements. The middle part is a hexagonal nut structure 1-1, and an appropriate cylindrical part 1-2 is added to the front end and bottom to increase the inner cavity space. The internal thread is not opened to the bottom, and an appropriate space is left at the bottom to car out the sealing groove 1-3 with a flat surface and low roughness. O-type sealing ring 2 forms a seal with the bottom and the outer surface of the sealing groove 1-3, as shown in Fig. 1 and 2. The bottom of the inner cavity of the hexagonal plug 1 is provided with a smooth surface, a cylinder with a narrow top and a wide bottom with a certain taper, called the sealing column 4, which is the main part of the seal. Sealing column 4 top ridge line parts car is rounded, so that plunger is inserted, can see with reference to Fig. 1,2,4. The material of the O-ring seal 2 is rubber, and it forms a seal with the bottom and the outer surface of the hexagonal plug seal groove 1-3, forms a seal with the seal column 4, and forms a seal surface with the bottom of the plunger seal ring 3 at the same time. See Figures 1 and 2. The upper part of the plunger sealing ring 3 is columnar, and the bottom is connected to a cylinder with a larger radius than the upper part. It looks like a stepped cylinder as a whole, but the height of the upper part is much higher than that of the lower part. The center is a through hole with a certain taper, and its taper is smaller than The taper of the sealing post 4 means that the diameter at the bottom of the through hole is greater than the diameter at the top of the sealing post 4 . The top of the sealing column 4 is chamfered so as to be inserted into the inner cavity of the threaded joint 5 . The diameter of the outer upper cylinder of the plunger sealing ring 3 is slightly smaller than the diameter of the inner cavity of the threaded connector 5, and the diameter of the bottom of the through hole is slightly larger than the diameter of the top of the sealing column 4, so that the sealing column 4 will gradually expand as the thread is screwed in. The plug seal ring 3 makes the outer surface of the plunger seal ring 3 seal the inner cavity of the threaded connector 5, and at the same time, the upper end surface of the step cylinder at the bottom of the plunger seal ring 3 forms a seal with the top of the threaded connector 5, and the cone of the seal column 4 The tapered surface of face and plunger sealing ring 3 through holes forms sealing, can see with reference to Fig. 1,2,4.

The hexagonal plug in this example is made of 304 stainless steel, and the O-ring 2 and the plunger sealing ring 3 are all made of fluororubber. After the threaded joint 5 and the vacuum pipeline are welded, wipe the threaded joint 5 and the plunger sealing ring 3 with alcohol cloth, and apply vacuum grease to the plunger sealing ring 3. 2 Put it on the sealing column 4, press it in, then insert the plunger sealing ring 3 into the cavity of the threaded connector 5, align the plug with the plunger hole and the thread, and use a wrench to continuously screw the thread of the connector into the plug , as the thread is screwed in, the sealing column 4 enters the central hole of the plunger sealing ring 3, and the sealing column 4 will gradually expand the plunger, so that the outer surface of the plunger seals the inner cavity of the threaded connector 5, and at the same time, the stepped cylinder at the bottom of the plunger The upper end surface forms a seal with the top end of the threaded joint 5, and the tapered surface of the sealing post 4 forms a seal with the tapered surface of the plunger through hole. Continue to tighten the plug. As the thread is screwed in, the sealing column will continue to expand the plunger, making the three sealing surfaces mentioned above more tightly sealed. The end surface is in contact with the O-ring 2 to form a seal; the O-ring 2 forms a seal with the sealing column under the extrusion of the plunger. When the O-ring seal 2 is in close contact with the end face of the bottom of the inner cavity of the plug, the O-ring deforms to form a seal with the end face, and at the same time forms a seal with the sealing groove. So far, it has become a multiple vacuum sealing insurance structure, which can achieve a good Vacuum tight. The above can be referred to FIG. 1 . Then the corresponding vacuum leak detection and pressure leak detection can be carried out, especially in the pressure leak detection, which can reduce many time-consuming and laborious operations, and can achieve higher pressure at the same time, increasing the safety and reliability of pressure leak detection .

In the actual use process, the plug and sealing ring can be selected according to actual needs. The work is stable and reliable, and the installation and disassembly are convenient.

The above descriptions are only examples of the present invention, and are not intended to limit the patent scope of the present invention. All implementations or changes that do not deviate from the present invention are included in the patent protection scope of the present invention.

Claims (10)

1. A vacuum sealing plug, characterized in that: it includes a hexagonal plug, an O-ring, and a plunger sealing ring, and the hexagonal plug includes a hexagonal nut structure, and the upper and lower ends of the hexagonal nut structure are respectively added There is a cylindrical part, the lower cylindrical part is a solid cylinder and a sealing groove with a smooth bottom is opened in the lower cylindrical part, the upper cylindrical part is a hollow structure, and a sealing column is arranged in the hexagonal nut structure, and the hexagonal nut structure is the same as the cylindrical part and the sealing column. As a whole, the O-ring seal is set on the lower end of the sealing column and is in contact with the inner wall of the lower end of the sealing groove of the hexagonal plug, the plunger sealing ring is set on the sealing column and the lower end of the plunger sealing ring is against the O-ring , The inner wall of the hexagonal nut structure of the hexagonal plug is provided with an internal thread, and the hexagonal plug is connected to the threaded connector through the internal thread. 2. A vacuum-sealed plug according to claim 1, wherein the sealing column is a cylinder with a smooth surface and a narrow top and a wide bottom with a certain taper. 3. A vacuum-sealed plug according to claim 1, characterized in that: the plunger sealing ring is a stepped cylinder as a whole, and a through hole with a narrow top and a wide bottom with a certain taper is opened in the center, and the taper is less than The taper of the seal post. 4. A vacuum sealing plug according to claim 1, characterized in that: the top of the sealing column is provided with a chamfer, which is fitted together with the plunger sealing ring. 5. The vacuum sealing plug according to claim 1, characterized in that: the outer surface of the plunger sealing ring is in close contact with the inner cavity of the threaded joint to form the first sealing surface. 6. A vacuum sealing plug according to claim 1 or 3, characterized in that: the upper end surface of the stepped cylinder at the bottom of the plunger sealing ring and the top end of the threaded joint form a second sealing surface. 7. A vacuum-sealed plug according to claim 1 or 3, characterized in that: the tapered surface of the sealing column is in close contact with the tapered surface of the through hole of the plunger sealing ring to form a third sealing surface. 8 . The vacuum sealing plug according to claim 1 , wherein the lower end surface of the plunger sealing ring presses the O-ring to form the fourth sealing surface. 9 . The vacuum sealing plug according to claim 1 , wherein the O-ring seals tightly against the sealing column to form a fifth sealing surface. 10 . 10 . The vacuum sealing plug according to claim 1 , wherein the O-ring squeezes the sealing groove to form the sixth sealing surface. 11 .