Hidden hinged inward opening ventilation window

Abstract

The present invention discloses a hidden hinge type inward opening ventilation window, comprising: a window frame, comprising two side window frame edges arranged oppositely, a hinge groove is formed on the indoor side of the side window frame edges, and the indoor side of the side window frame edges extends to form a third blocking surface; a window sash, comprising a sash frame and a sash body arranged therein, the sash frame comprising two side sash frame edges arranged oppositely, the indoor side of the side sash frame edges forming a first blocking wall, a connecting arm parallel to the first blocking wall and having a length less than the first blocking wall is formed between the indoor side and the outdoor side of the side sash frame edges, the first blocking wall, the connecting arm and the hinge groove form an accommodating space, and a third sealing strip is provided on the outdoor side of the connecting arm to be connected to the third blocking surface in a closed state; a hinge group is arranged in the accommodating space between one of the side sash frame edges and the side window frame edge, comprising a first hinge arranged on the hinge groove and a second hinge arranged on the indoor side of the connecting arm, the second hinge being connected to the first hinge via a hinge shaft, so that the window sash can be installed on the window frame in a rotatable and left-right limited manner.

Description

Technical Field

[0001] The invention relates to the technical field of inner window design of building curtain walls, and in particular to a hidden hinge type inner opening ventilation window. Background Art

[0002] Existing unitized curtain walls mostly adopt the form of external sunshade and internal opening windows. The opening of traditional internal casement windows is mainly hinged. Hinge is a device for connection or rotation, so that doors, windows or other swinging parts can be rotated. Usually, hinges are arranged on the vertical edges of the internal casement windows and installed on the outside of the window frame, which requires occupying a wider vertical frame space, and the hinge axis is still visible indoors. The indoor effect is not simple and beautiful, and the overall visual effect of the hinge and the curtain wall is not coordinated. At the same time, the hinge is installed at the joint between the sash frame and the window frame, which makes it easy for the hinge to extend into the room and conflict with the position of the indoor sealing strip. In order to avoid the position requirement, the strip needs to be cut to reserve a position for the hinge, which leads to a decrease in the airtightness and watertightness of the internal window.

[0003] In view of this, it is necessary to provide a hidden hinge type inward opening ventilation window to improve air tightness and water tightness and make the indoor effect simple and beautiful. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a hidden hinge type inward opening ventilation window to improve air tightness and water tightness and make the indoor effect simple and beautiful.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solution: a hidden hinged inward-opening ventilation window, arranged at the vertical decorative strip of the unitized curtain wall panel, comprising:

[0006] The window frame comprises an upper window frame side and a lower window frame side which are respectively arranged opposite to each other up and down, and two side window frame sides which are arranged opposite to each other, wherein the indoor side of the side window frame side is recessed toward the outdoor side to form a hinge groove, and the indoor side of the side window frame side extends outside the hinge groove to form a third blocking surface facing the indoor side;

[0007] A window sash comprises a sash frame and a sash body, wherein the sash body is mounted on the sash frame, wherein the sash frame comprises an upper sash frame edge and a lower sash frame edge respectively arranged opposite to each other up and down, and two side sash frame edges arranged opposite to each other, wherein the side sash frame edges are respectively arranged corresponding to the side window frame edges, wherein the indoor side of the side sash frame edge extends to form a first baffle wall facing the indoor, wherein a connecting arm parallel to the first baffle wall is formed between the indoor side and the outdoor side of the side sash frame edge, wherein the length of the connecting arm is less than the first baffle wall, wherein an accommodating space is formed between the first baffle wall, the connecting arm and the hinge groove, wherein a third sealing strip is arranged on the outdoor side of the connecting arm, and when the window sash is closed in the window frame, the connecting arm is connected to the third baffle surface through the third sealing strip;

[0008] The hinge group is arranged in the accommodating space between one side sash frame edge and the corresponding side window frame edge, and includes a first hinge and a second hinge. The first hinge is installed on the hinge groove, and the second hinge is installed on the indoor side of the connecting arm. The second hinge is connected to the first hinge through a hinge shaft, so that the window sash is installed on the window frame in a rotatable and left and right limited manner.

[0009] Its further technical solution is: the outdoor side of the side window frame edge extends to form a first baffle facing the outdoors corresponding to the third baffle, a second baffle parallel to the first baffle is formed between the outdoor side of the side window frame edge and the indoor side, and the ends of the first baffle and the second baffle are respectively provided with a first sealing strip and a second sealing strip; the outdoor side of the side sash frame edge extends to form a third baffle wall facing the outdoors, and a second baffle parallel to the third baffle is formed between the outdoor side of the side sash frame edge and the connecting arm; when the window sash is closed in the window frame, the first baffle is connected to the third baffle through the first sealing strip and the second baffle is connected to the second baffle through the second sealing strip.

[0010] A further technical solution is as follows: the area of ​​the first blocking surface is larger than that of the second blocking surface; the ends of the first blocking surface and the second blocking surface are respectively formed with strip installation grooves facing the room for the first sealing strip and the second sealing strip to be installed respectively.

[0011] Its further technical solution is: the lower sash frame edge is arranged corresponding to the lower window frame edge, the structure of the lower sash frame edge is the same as that of the side sash frame edge, the outdoor side of the lower window frame edge is extended to form a first baffle facing the outdoors, the lower end of the first baffle is provided with a drain outlet, a second baffle parallel to the first baffle is formed between the outdoor side of the lower window frame edge and the indoor side thereof, the ends of the first baffle and the second baffle are respectively provided with a first sealing strip and a second sealing strip, and the indoor side of the lower window frame edge is extended to form a third baffle facing the indoor; when the window sash is closed in the window frame, the first baffle is connected to the third baffle wall of the lower sash frame edge through the first sealing strip and the second baffle is connected to the second baffle wall of the lower sash frame edge through the second sealing strip so that the first baffle, the lower window frame edge, the second baffle, the lower sash frame edge and its third baffle wall and the second baffle wall of the lower sash frame edge are enclosed to form a water collecting trough, and the connecting arm of the lower sash frame edge is connected to the third baffle through the third sealing strip.

[0012] A further technical solution is as follows: the fan body comprises two aluminum plates which are arranged opposite to each other and face indoors and outdoors respectively, thermal insulation rock wool is sandwiched between the two aluminum plates, and the four sides of the two aluminum plates are bent relative to each other to form folded edges to be connected to the fan frame.

[0013] A further technical solution is as follows: a water-retaining sealant is arranged between the folded edge of the aluminum plate facing the outside and the fan frame.

[0014] A further technical solution is as follows: a clamping point is formed on the side sash frame edge between the connecting arm and the first retaining wall to limit the position of the second hinge.

[0015] Its further technical solution is: the first hinge includes a mounting plate, a connecting plate and two bearing parts, the two bearing parts are relatively spaced apart on the connecting plate for the hinge axis to pass through, the connecting plate is vertically arranged on the mounting plate, and the bearing part is located at the suspended end of the connecting plate; the second hinge includes a main board and a main bearing arranged on the main board, the main board is mounted on the connecting arm by screws, and the main bearing is installed in the interval between the two bearing parts through the hinge axis so as to rotate around the hinge axis.

[0016] Its further technical solution is: a rubber strip installation position is formed on the outdoor side of the connecting arm, the connecting arm extends outward from the side of the rubber strip installation position close to the side of the side window frame to form a convex edge, and a hook is formed on the side of the main board facing the connecting arm to engage with the convex edge.

[0017] A further technical solution is as follows: a nut for adjusting the position of the second hinge is sleeved on the hinge shaft.

[0018] The beneficial technical effect of the present invention is that the hidden hinge type inward opening ventilation window of the present invention forms a hinge groove on the indoor side of the side window frame edge of the window frame, forms a first baffle wall on the indoor side of the side sash frame edge of the window sash, and a connecting arm parallel to the first baffle wall is formed between the indoor side and the outdoor side of the side sash frame edge. The hinge group is installed in the accommodating space formed between the first baffle wall, the connecting arm and the hinge groove to hide the hinge group, and there is no need to occupy the vertical decorative strip space of the wider curtain wall panel, so that the hinge group is not exposed when the window sash is closed or opened, and the indoor effect is simple and beautiful. At the same time, the length of the connecting arm is less than the first baffle wall and the outdoor side of the connecting arm is provided with a third sealing strip to avoid the hinge group from conflicting with the position of the third sealing strip during rotation. There is no need to cut the third sealing strip, which effectively improves air tightness and water tightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the hidden hinge type inward opening ventilation window of the present invention when the window sash is installed on the curtain wall in a closed state;

[0020] Figure 2 yes Figure 1 A schematic diagram of the installation structure of the window sash and window frame of the hidden hinge type inward opening ventilation window;

[0021] Figure 3 It is a structural schematic diagram of a window sash of a hidden hinge type inwardly opening ventilation window of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the side window frame edge of the hidden hinge type inward opening ventilation window of the present invention;

[0023] Figure 5 It is a structural schematic diagram of the hidden hinge type inward opening ventilation window of the present invention when the window sash is installed on the curtain wall in an open state;

[0024] Figure 6 yes Figure 5 A schematic diagram of the installation structure of the window sash and window frame of the hidden hinge type inward opening ventilation window;

[0025] Figure 7 It is a schematic diagram of the vertical cross-section structure of the bottom of the hidden hinge type inward opening ventilation window of the present invention;

[0026] Figure 8 It is a structural schematic diagram of a hinge assembly of a hidden hinge type inward opening ventilation window of the present invention;

[0027] Fig. 9 It is a top view of the hinge assembly of the hidden hinge type inward opening ventilation window of the present invention;

[0028] Fig.10 It is a left view of the hinge assembly of the hidden hinge type inward opening ventilation window of the present invention;

[0029] Fig.11 It is a structural schematic diagram of the first hinge of the hinge assembly of the hidden hinge type inward opening ventilation window of the present invention;

[0030] Fig.12 It is a top view of the first hinge of the hinge assembly of the hidden hinge type inward opening ventilation window of the present invention;

[0031] Fig.13 It is a left view of the first hinge of the hinge assembly of the hidden hinge type inward opening ventilation window of the present invention;

[0032] Fig.14 It is a structural schematic diagram of the second hinge of the hinge assembly of the hidden hinge type inward opening ventilation window of the present invention;

[0033] Fig.15 It is a top view of the second hinge of the hinge assembly of the hidden hinge type inward opening ventilation window of the present invention;

[0034] Fig.16 It is a left view of the second hinge of the hinge assembly of the hidden hinge type inward opening ventilation window of the present invention;

[0035] Fig.17 The utility model is a schematic diagram of the installation structure of the hinge shaft and the fine adjustment nut of the hinge group of the hidden hinge type inward opening ventilation window of the present invention. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to more clearly understand the objectives, technical solutions and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0037] Reference Figures 1 to 7 The hidden hinge type inward opening ventilation window 10 of the present invention is arranged at the vertical decorative strip of the unit curtain wall plate, including a window frame 11, a window sash 12 and a hinge group 13, the window frame 11 includes an upper window frame edge and a lower window frame edge 112 arranged opposite to each other up and down and two side window frame edges 111 arranged opposite to each other, the indoor side of the side window frame edge 111 is recessed toward the outdoor side to form a hinge groove 113, and the indoor side of the side window frame edge 111 extends outside the hinge groove 113 to form a third blocking surface 114 facing the indoor room; The window sash 12 includes a sash frame 121 and a sash body 122, wherein the sash body 122 is mounted on the sash frame 121, wherein the sash frame 121 includes an upper sash frame edge and a lower sash frame edge 128 which are respectively arranged opposite to each other, and two opposite side sash frame edges 123 which are respectively arranged corresponding to the side window frame edges 111, wherein the indoor side of the side sash frame edge 123 extends to form a first retaining wall 124 which faces the indoor part, and the indoor side of the side sash frame edge 123 and the outdoor side of the side sash frame edge 123 are respectively arranged to be connected to each other. A connecting arm 125 parallel to the first baffle wall 124 is formed between the first baffle wall 124, and the length of the connecting arm 125 is less than the first baffle wall 124. An accommodating space 101 is formed between the first baffle wall 124, the connecting arm 125 and the hinge groove 113. A third sealing strip 102 is arranged on the outdoor side of the connecting arm 125. When the window sash 12 is closed in the window frame 11, the window sash 12 is in a closed state, and the connecting arm 125 is connected to the third baffle surface 114 through the third sealing strip 102. The hinge group 13 is arranged in the accommodating space 101 between one of the side sash frame edges 123 and the corresponding side window frame edge 111, and includes a first hinge 131 and a second hinge 132. The first hinge 131 is installed on the hinge groove 113, and the second hinge 132 is installed on the indoor side of the connecting arm 125. The second hinge 132 is connected to the first hinge 131 through a hinge shaft 133, so that the window sash 12 is installed on the window frame 11 in a rotatable and left and right limited manner.

[0038] Among them, the indoor side refers to the side close to and facing the indoor room, and the outdoor side refers to the side close to and facing the outdoor room. The number of the hinge groups 13 can be multiple and distributed in parallel in the accommodating space 101. The window sash 12 opens toward the indoor room, and the opening angle range between it and the window frame 11 is 0-90°. The open state of the window sash 12 means that the window sash 12 is opened to 90° with the window frame 11. During the opening process, the first baffle wall 124 will not be hindered by the window frame 11. The window frame 11 and the window sash 12 are spliced ​​at 45°. The outdoor side of the hidden hinge type inward-opening ventilation window 10 corresponds to the perforated aluminum plate sunshade 20 facing the unit curtain wall. The hidden hinge type inward opening ventilating window 10 is formed by forming a hinge groove 113 on the indoor side of the side window frame edge 111 of the window frame 11, forming a first retaining wall 124 on the indoor side of the side sash frame edge 123 of the sash frame 121 of the window sash 12, and forming a connecting arm 125 parallel to the first retaining wall 124 between the indoor side and the outdoor side of the side sash frame edge 123, and the hinge assembly 13 is installed in the accommodating space 101 formed between the first retaining wall 124, the connecting arm 125 and the hinge groove 113, so as to hide the hinge. The hinge group 13 does not need to occupy the vertical frame space of the wider curtain wall panel, so that the hinge group 13 is not exposed when the window sash 12 is closed or opened, and the indoor effect is simple and beautiful. At the same time, the length of the connecting arm 125 is less than the first baffle wall 124, and the third sealing strip 102 is provided on the outdoor side of the connecting arm 125 to avoid the hinge group 13 from conflicting with the third sealing strip 102 during the rotation process. There is no need to cut off the third sealing strip 102 to avoid the hinge group 13, which effectively improves the air tightness and water tightness.

[0039] Specifically, in this embodiment, the outdoor side of the side window frame edge 111 corresponds to the third blocking surface 114 and extends to form a first blocking surface 115 facing the outdoors, and a second blocking surface 116 parallel to the first blocking surface 115 is formed between the outdoor side of the side window frame edge 111 and the indoor side of the side window frame edge 111, and the end of the first blocking surface 115 is provided with a first sealing strip 103, and the end of the second blocking surface 116 is provided with a second sealing strip 104; the outdoor side of the side sash frame edge 123 extends to form a third blocking wall 126 facing the outdoors, and the outdoor side of the side sash frame edge 123 is connected to the connecting arm A second baffle 127 parallel to the third baffle 126 is formed between 125; when the window sash 12 is closed in the window frame 11, the first baffle surface 115 is connected to the third baffle 126 through the first sealing strip 103 and the second baffle surface 116 is connected to the second baffle 127 through the second sealing strip 104, so as to enclose a first sealed space 105 between the side window frame edge 111 and the side sash frame edge 123, so that most of the rainwater is blocked outdoors by the first sealing strip 103, and a small part of the rainwater that penetrates into the room is blocked by the second sealing strip 104 and collected in the first sealed space 105.

[0040] Preferably, the area of ​​the first blocking surface 115 is larger than that of the second blocking surface 116. The ends of the first blocking surface 115 and the second blocking surface 116 are respectively formed with strip installation grooves 117 facing the room, so as to respectively install the first sealing strip 103 and the second sealing strip 104. The area of ​​the first blocking surface 115 is larger than that of the second blocking surface 116, so as to better block rainwater.

[0041] Continue to refer to Figure 7 Preferably, the lower sash frame edge 128 is arranged corresponding to the lower window frame edge 112, and the structure of the lower sash frame edge 128 is the same as that of the side sash frame edge 123. Then, the indoor side of the lower sash frame edge 128 is extended to form a first baffle wall 124 facing the indoor room, and a connecting arm 125 parallel to the first baffle wall 124 is formed between the indoor side of the lower sash frame edge 128 and the outdoor side of the lower sash frame edge 126. The length of the connecting arm 125 is less than the first baffle wall 124, and a third sealing strip 102 is arranged on the outdoor side of the connecting arm 125. The outdoor side of the lower sash frame edge 128 is extended to form a third baffle wall 126 facing the outdoor room, and a second baffle wall 127 parallel to the third baffle wall 126 is formed between the outdoor side of the lower sash frame edge 128 and the connecting arm 125. The outdoor side of the lower window frame edge 112 is extended to form a first baffle 118 facing the outdoor, and the lower end of the first baffle 118 is provided with a drain port 1181, and a second baffle 119 parallel to the first baffle 118 is formed between the outdoor side of the lower window frame edge 112 and the indoor side of the lower window frame edge 112, and the end of the first baffle 118 is provided with a first sealing strip 103, and the end of the second baffle 119 is provided with a second sealing strip 104, and the indoor side of the lower window frame edge 112 is extended to form a third baffle 1121 facing the indoor; when the window sash 12 is closed in the window frame 11 When the first baffle plate 118 is connected to the third baffle wall 126 of the lower sash frame edge 128 through the first sealing strip 103, and the second baffle plate 119 is connected to the second baffle wall 127 of the lower sash frame edge 128 through the second sealing strip 104, the first baffle plate 118, the lower window frame edge 112, the second baffle plate 119, the lower sash frame edge 128 and its third baffle wall 126 and the second baffle wall 127 of the lower sash frame edge 128 are enclosed to form a water collecting trough 106, and the connecting arm 125 of the lower sash frame edge 128 is connected to the third baffle plate 1121 through the third sealing strip 102. The lower window frame edge 112 blocks most of the rainwater from the outside through the first sealing strip 103, blocks a small part of the rainwater that penetrates in through the second sealing strip 104, collects it in the water collecting trough 106, and then discharges it to the outside through the drain port 1181. Preferably, the first sealed space 105 may be in communication with the water collecting tank 106 , so that the collected rainwater may enter the water collecting tank 106 under the action of gravity and be discharged outdoors through the drain port 1181 .

[0042] Specifically, the fan body 122 includes two aluminum plates 1221 that are arranged opposite to each other and face indoors and outdoors respectively, and thermal insulation rock wool 1222 is sandwiched between the two aluminum plates 1221. The four sides of the two aluminum plates 1221 are relatively bent to form folded edges 1223 to connect with the fan frame 121. The fan frame 121 is fixedly connected to the aluminum plate 1221 by screws 107, so that the fan body 122 is installed in the fan frame 121. By installing thermal insulation rock wool 1222 in the aluminum plate 1221, it can play a role in heat preservation and energy saving. Preferably, a water-retaining sealant 108 is provided between the folded edge 1223 of the aluminum plate 1221 facing the outdoors and the fan frame 121 to prevent rainwater from penetrating into the fan body 122, with high water tightness and stable structure of the fan body 122. The window frame 11 and the window sash 12 are spliced ​​at 45 degrees. After the four corners of the window sash 12 are assembled, structural glue can be injected between the folded edge 1223 of the aluminum plate 1221 of the sash body 122 and the sash frame 121 to connect them, forming the water-blocking sealant 108 to ensure the stability of the structure and prevent water seepage. Among them, the indoor side of the window sash 12 can be provided with a hidden handle, which is recessed into the surface of the aluminum plate 1221 on the indoor side of the window body 121 to avoid scratching indoor people.

[0043] Continue to refer to Figure 2 , Figure 3 , Figure 4 and Figure 6 In this embodiment, the side sash frame edge 123 forms a clamping point 1231 between the connecting arm 125 and the first retaining wall 124 to limit the position of the second hinge 132. The second hinge 132 is mounted on the connecting arm 125 by means of the screw 107. The clamping point 1231 is used to clamp the second hinge 132 and the connecting arm 125, thereby preventing the second hinge 132 from shifting. The insertion of the second hinge 132 side into the clamping point 1231 can reduce the influence of the self-weight eccentric force on the screw 107, thereby making the connection more stable and reliable.

[0044] Combination Figures 8 to 17 Preferably, a nut 134 for adjusting the position of the second hinge 132 is sleeved on the hinge shaft 133 to abut against the end of the second hinge 132. The position of the nut 134 on the hinge shaft 133 is adjusted to adjust the height of the second hinge 132 relative to the first hinge 131, thereby adjusting the height of the window sash 12 relative to the window frame 11, and making the gap between the window sash 12 and the window frame 11 uniform. In this embodiment, the number of the nuts 134 is two. Of course, in other embodiments, the number of the nut 134 may be one.

[0045] Specifically, in this embodiment, the first hinge 131 includes a mounting plate 1311, a connecting plate 1312 and two bearing members 1313, the two bearing members 1313 are relatively spaced apart on the connecting plate 1312 for the hinge axis 133 to pass through, the connecting plate 1312 is vertically disposed on the mounting plate 1311, and the bearing member 1313 is located at the suspended end of the connecting plate 1312; the second hinge 132 includes a main board 1321 and a main bearing 1322 disposed on the main board 1321, the main board 1321 is mounted on the connecting arm 125 by means of screws 107, and the main bearing 1322 is mounted in the interval between the two bearing members 1313 by means of the hinge axis 113, so that the main bearing 1322 can rotate around the hinge axis 133, thereby driving the sash frame 122 to rotate around the hinge axis 133, thereby realizing the opening and closing of the window sash 12. The mounting plate 1311 is installed in the hinge groove 113 and fixed by screws 107. The two nuts 134 sleeved on the hinge shaft 133 are respectively located at both ends of the main bearing 1322 to adjust the position of the second hinge 132. The mounting plate 1311 and the main board 1321 are both provided with holes 1001 for the screws 107 to pass through.

[0046] Combination Figure 3 , Figure 6 and Fig.15 Specifically, a rubber strip installation position 109 is formed on the outdoor side of the connecting arm 125, and the connecting arm 125 extends outward from the side of the rubber strip installation position 109 close to the corresponding side window frame edge 111 to form a convex edge 1251. A hook 1323 engaged with the convex edge 1251 is formed on the side of the main board 1321 facing the connecting arm 125. The main board 1321 is installed on the connecting arm 125 by screws 107, and the hook 1323 is engaged with the convex edge 1251 to limit the position of the second hinge 132 and prevent the second hinge 132 from shifting, making the connection more stable and reliable.

[0047] To summarize, the hidden hinge type inward-opening ventilation window of the present invention forms a hinge groove on the indoor side of the side window frame edge of the window frame, forms a first baffle wall on the indoor side of the side sash frame edge of the window sash, and a connecting arm parallel to the first baffle wall is formed between the indoor side and the outdoor side of the side sash frame edge. The hinge group is installed in the accommodating space formed between the first baffle wall, the connecting arm and the hinge groove to hide the hinge group, and there is no need to occupy the vertical frame space of the wider curtain wall panel, so that the hinge group is not exposed when the window sash is closed or opened, and the indoor effect is simple and beautiful. At the same time, the length of the connecting arm is less than the first baffle wall and the outdoor side of the connecting arm is provided with a third sealing strip to avoid the hinge group from conflicting with the third sealing strip during rotation. There is no need to cut the third sealing strip, which effectively improves air tightness and water tightness.

[0048] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Those skilled in the art can make various equivalent changes and improvements based on the above embodiments, and all equivalent changes or modifications made within the scope of the claims should fall within the protection scope of the present invention.

Claims

1. A hidden hinged inward-opening ventilation window, arranged at the vertical decorative strip of the unitized curtain wall panel, characterized in that: include: The window frame comprises an upper window frame side and a lower window frame side which are respectively arranged opposite to each other up and down, and two side window frame sides which are arranged opposite to each other, wherein the indoor side of the side window frame side is recessed toward the outdoor side to form a hinge groove, and the indoor side of the side window frame side extends outside the hinge groove to form a third blocking surface facing the indoor side; A window sash comprises a sash frame and a sash body, wherein the sash body is mounted on the sash frame, wherein the sash frame comprises an upper sash frame edge and a lower sash frame edge respectively arranged opposite to each other up and down, and two side sash frame edges arranged opposite to each other, wherein the side sash frame edges are respectively arranged corresponding to the side window frame edges, wherein the indoor side of the side sash frame edge extends to form a first baffle wall facing the indoor, wherein a connecting arm parallel to the first baffle wall is formed between the indoor side and the outdoor side of the side sash frame edge, wherein the length of the connecting arm is less than the first baffle wall, wherein an accommodating space is formed between the first baffle wall, the connecting arm and the hinge groove, wherein a third sealing strip is arranged on the outdoor side of the connecting arm, and when the window sash is closed in the window frame, the connecting arm is connected to the third baffle surface through the third sealing strip; The hinge group is arranged in the accommodating space between one side sash frame edge and the corresponding side window frame edge, and includes a first hinge and a second hinge. The first hinge is installed on the hinge groove, and the second hinge is installed on the indoor side of the connecting arm. The second hinge is connected to the first hinge through a hinge shaft, so that the window sash is installed on the window frame in a rotatable and left and right limited manner.

2. The hidden hinge type inward opening ventilation window according to claim 1, characterized in that: The outdoor side of the side window frame edge extends to form a first baffle surface facing the outdoors corresponding to the third baffle surface, a second baffle surface parallel to the first baffle surface is formed between the outdoor side of the side window frame edge and the indoor side thereof, and the ends of the first baffle surface and the second baffle surface are respectively provided with a first sealing strip and a second sealing strip; the outdoor side of the side sash frame edge extends to form a third baffle wall facing the outdoors, and a second baffle wall parallel to the third baffle wall is formed between the outdoor side of the side sash frame edge and the connecting arm; when the window sash is closed in the window frame, the first baffle surface is connected to the third baffle wall through the first sealing strip and the second baffle surface is connected to the second baffle wall through the second sealing strip.

3. The hidden hinge type inward opening ventilation window according to claim 2, characterized in that: The area of ​​the first blocking surface is larger than that of the second blocking surface. The ends of the first blocking surface and the second blocking surface are respectively formed with rubber strip installation grooves facing the room for the first sealing rubber strip and the second sealing rubber strip to be installed respectively.

4. The hidden hinge type inward opening ventilation window according to claim 2, characterized in that: The lower sash frame edge is arranged corresponding to the lower window frame edge, the structure of the lower sash frame edge is the same as the structure of the side sash frame edge, the outdoor side of the lower window frame edge is extended to form a first baffle facing the outdoors, the lower end of the first baffle is provided with a drain outlet, a second baffle parallel to the first baffle is formed between the outdoor side of the lower window frame edge and the indoor side thereof, the ends of the first baffle and the second baffle are respectively provided with a first sealing strip and a second sealing strip, and the indoor side of the lower window frame edge is extended to form a third baffle facing the indoor; when the window sash is closed in the window frame, the first baffle is connected to the third baffle wall of the lower sash frame edge through the first sealing strip and the second baffle is connected to the second baffle wall of the lower sash frame edge through the second sealing strip, so that the first baffle, the lower window frame edge, the second baffle, the lower sash frame edge and its third baffle wall and the second baffle wall of the lower sash frame edge are enclosed to form a water collecting trough, and the connecting arm of the lower sash frame edge is connected to the third baffle through the third sealing strip.

5. The hidden hinge type inward opening ventilation window according to claim 1, characterized in that: The fan body comprises two aluminum plates which are arranged opposite to each other and face indoor and outdoor respectively, thermal insulation rock wool is sandwiched between the two aluminum plates, and the four sides of the two aluminum plates are bent relative to each other to form folded edges to be connected to the fan frame.

6. The hidden hinge type inward opening ventilation window according to claim 5, characterized in that: A water-retaining sealant is arranged between the folded edge of the aluminum plate facing the outside and the fan frame.

7. The hidden hinge type inward opening ventilation window according to claim 1, characterized in that: The side sash frame has a clamping point formed between the connecting arm and the first retaining wall to limit the position of the second hinge.

8. The hidden hinge type inward opening ventilation window according to claim 1, characterized in that: The first hinge includes a mounting plate, a connecting plate and two bearing components. The two bearing components are relatively spaced apart on the connecting plate for the hinge axis to pass through. The connecting plate is vertically arranged on the mounting plate, and the bearing component is located at the suspended end of the connecting plate. The second hinge includes a main board and a main bearing arranged on the main board. The main board is mounted on the connecting arm by screws, and the main bearing is installed in the interval between the two bearing components through the hinge axis so as to rotate around the hinge axis.

9. The hidden hinged inward opening ventilation window according to claim 8, characterized in that: The outdoor side of the connecting arm forms a rubber strip installation position, and the connecting arm extends outward from the side of the rubber strip installation position close to the side window frame to form a convex edge. The side of the main board facing the connecting arm is formed with a hook that is engaged with the convex edge.

10. The hidden hinge type inward opening ventilation window according to claim 1, characterized in that: The hinge shaft is sleeved with a nut for adjusting the position of the second hinge.

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