CLAIM FOR PRIORITY

This application is a U.S. national phase entry under 35 U.S.C. § 371 from PCT International Application No. PCT/CN2017/110309 filed on Nov. 10, 2017, which is based upon and claims the benefit of priority from the prior Chinese Patent Application No. 201710282659.4 filed on Apr. 26, 2017 and Chinese Patent Application No. 201720920604.7 filed on Jul. 27, 2017. The entire contents of the above applications are incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to the technical field of vacuum insulated glass, and in particular to a vacuum insulated glass product.

BACKGROUND

Vacuum insulated glass is an emerging category of glass, and is generally composed of two pieces of glass, between which is a vacuum layer. Due to the existence of this vacuum layer, vacuum insulated glass has good performance in sound insulation, heat insulation, and condensation resistance, and is more in line with the national development requirements for energy saving and environmental protection.

The sealing quality of vacuum insulated glass directly affects the performance of vacuum insulated glass. At present, the sealing of vacuum insulated glass mainly adopts two methods: one is sealing with low-melting-point glass powder, and the other is sealing with metal. Using metal for sealing may firstly prepare metal layers at the edge portions of the opposite surfaces of the two glass substrates, respectively, and then employ a brazing process to firmly connect the metal layers and the solder, thereby achieving airtight sealing of the two glass substrates.

In the sealing process, the brazing solder can be heated by high-frequency induction heating, and the high-frequency induction welding head is formed by a high-frequency induction coil. In the welding process, the centerline of the high-frequency induction welding head is aligned with the centerline of the welding strip, and the high-frequency induction welding head moves forward at a uniform speed along the centerline of the welding strip, thereby achieving airtight sealing around the vacuum insulated glass.

Since the solder and the metal layers coexist in the sealing area, in addition to heating the solder, the high-frequency induction welding head also heats the metal layers in the sealing area during the operation. Referring toFIG. 1, in the actual production process, a phenomenon of over-burning of the metal layer3often occurs in the corner areas5of the glass substrates, resulting in a dramatic reduction of the bonding strength between the metal layer3and the glass substrates. For example, when the metal layer is a silver film layer sintered on the glass substrate, silver in the silver film in the corner area of the glass substrate is fused into the brazing solder when overheating, causing a dramatic reduction of the welding strength in the corner area of the produced vacuum insulated glass, thereby affecting the welding reliability and the service life of the vacuum insulated glass.

SUMMARY OF THE DISCLOSURE

In view of the problem that the induction-heating welding in the prior art reduces the welding strength at the corners of the vacuum insulated glass, the inventors have found through research that: the high-frequency induction welding head necessarily conducts a deceleration-redirection-acceleration process when going through the corner areas. Therefore, the induction heating time of the internal corner portion in the corner areas of the vacuum insulated glass is too long, and the heating speed of the edges of the metal layers during the heating process is significantly greater than the heating speed of the center of the metal layers. These are the main causes for over-burning of the metal layers in the corner areas, especially the internal corner portion of the corner areas.

The inventors have also found through research that: changing the relative position of the moving trajectory of the center of the high-frequency induction welding head and the centerline of the metal layer in width direction, and making the moving trajectory of the center of the high-frequency induction welding head deviate from the centerline of the metal layers in width direction, may reduce the induction power of the metal layers in the corner areas, and thereby avoid the over-burning phenomenon of the metal layers in the corner areas.

A manner regarding changing the relative position of the moving trajectory of the center of the high-frequency induction welding head and the centerline of the metal layer in width direction may be changing the shape of the metal layers to make the inner and the outer edges of the metal layers in the corner areas in an arc-shape. By doing this, the high-frequency induction welding head travels along the centerline of the metal layers in width direction when going through the corner areas, thereby avoiding the over-burning problem of the metal layer in the corner areas. A vacuum insulated glass product can be obtained based on the above sealing method. The structure of the vacuum insulated glass product is as follows.

A vacuum insulated glass product comprises:

a first glass substrate;

a second glass substrate disposed opposite to the first glass substrate;

a sealing structure provided between the first glass substrate and the second glass substrate and adjacent to edges of the first glass substrate and the second glass substrate, configured to form a vacuum cavity by an airtight sealing of the first glass substrate and the second glass substrate; and

a plurality of supports provided inside the vacuum cavity for bearing pressure from the first glass substrate and the second glass substrate.

The sealing structure comprises: a metal layer which is fixedly formed on each of the two facing surfaces of the first glass substrate and the second glass substrate, respectively, and an intermediate solder layer which connects the two metal layers. The metal layers have arc-shaped transition structures at the corner areas of the glass substrates.

Further, the two metal layers and the intermediate solder layer are matched in width.

Further, the first glass substrate or the second glass substrate is provided with a pump-out hole.

Further, a gas adsorbent for absorbing residual gas is disposed in the vacuum cavity.

Further, the metal layers are sintered on the first glass substrate and the second glass substrate by a metal slurry, respectively.

Further, a width of a straight segment of the metal layer is d, an arc radius of an inner edge of the metal layer in the corner area is r, and an arc radius of an outer edge of the metal layer in the corner area is R, where d=R−r.

Further, the width of the straight segment of the metal layer is about 8 mm, the arc radius of the inner edge of the metal layer in the corner area is about 3 mm, and the arc radius of the outer edge of the metal layer in the corner area is about 11 mm.

This disclosure describes changing a shape of the sealing structure at the corner areas of the glass substrates, i.e., replacing break corners with arc-shaped transitions. By doing this, the time for repeatedly heating internal corner parts of a welding strip is reduced during induction welding, resulting in uniformly heating of the welding strip at the corner areas, and obtaining a glass product with better sealing effect.

