A negative pressure centrifugal injection glue potting process and device

Abstract

A negative pressure centrifugal injection glue potting process and device belong to the glue potting process. The device includes an upper cover, a lower box, an injection glue potting component and a rotating component. The upper cover and the lower box form a sealed structure, and the sealed structure is connected to an external vacuum pump through an exhaust passage; an injection glue potting component is arranged inside the lower box, the injection glue potting component is installed outside the shell to be potted with glue, and a ventilation hole is provided to connect the inside of the lower box and the shell to be potted with glue; the glue potting component includes an injection glue pad, and the injection glue pad is pressed at the position of the area to be potted with glue through a pressing plate, and an injection glue channel is formed at the position of the area to be potted with glue. Through the above structure and its potting process, the present invention can provide a negative pressure centrifugal injection glue potting process and device with strong applicability and good potting effect.

Description

Technical Field

[0001] The present invention belongs to the glue potting process, and particularly relates to a negative pressure centrifugal injection glue potting process and device. Background Art

[0002] Products such as membrane oxygenators for extracorporeal circulation and dialyzers for hemodialysis need to be potted with glue at the edges of the products. Membrane oxygenators and dialyzers generally mainly include a housing and hollow fibers placed inside the housing. During the preparation process, glue needs to be injected into the connection between the housing and the ends of the hollow fibers to play a role in connection and sealing.

[0003] In the prior art, to prevent the glue from seeping into the gaps between the fibers under the action of surface tension, centrifugal treatment is usually adopted, that is, the glue is first injected through the glue injection port on the housing into the two port positions of the membrane oxygenator or dialyzer, and then the whole assembly is rotated until the glue is cured to complete the potting. This method has four limitations:

[0004] First, a glue injection port must be provided on the housing, so the structural design of the housing of the membrane oxygenator or dialyzer is restricted;

[0005] Second, the driving force for injecting the glue is its own gravity. If the viscosity of the glue is large and the fluidity is poor, the filling effect of the potting is not good;

[0006] Third, the current method is only applicable to the potting of both ends of a cylindrical outer shell with openings, and it is difficult to simultaneously pot the four-sided openings of a square outer shell;

[0007] Fourth, it is difficult for the current method to achieve the effect of zoned potting on a single-sided potting surface. Summary of the Invention

[0008] The purpose of the present invention is to provide a negative pressure centrifugal injection glue potting process and device to solve the problems raised in the above background art.

[0009] To achieve the above purpose, the present invention provides the following technical solution: A negative pressure centrifugal injection glue potting device, in which an upper cover and a lower box form a sealed structure; the sealed structure is connected to an external vacuum pump through an exhaust passage; a glue injection potting assembly is arranged inside the lower box, and the glue injection potting assembly is installed between the upper cover and the lower box in a concentric manner through a rotating assembly;

[0010] The glue injection potting assembly is installed outside the housing to be potted with glue, and is provided with a ventilation hole connecting the inside of the lower box and the housing to be potted with glue; the glue potting assembly includes a glue injection pad, the glue injection pad is pressed on the position of the area to be potted with glue through a pressing plate, and a glue injection channel is formed at the position of the area to be potted with glue; one end of the glue injection joint is connected to the glue injection channel, and the other end is connected to a glue injection cylinder through a connecting pipe.

[0011] The described glue injection pad is provided with raised features corresponding to the groove features on the housing to be glue-injected.

[0012] Rotating component mounting openings are provided at the middle positions of both the upper cover and the lower box.

[0013] The rotating component mounting opening includes a stepped groove at the opening, and a dynamic sealing ring is provided in the stepped groove. Screw I passes through the through hole I of the flange and is screwed into the screw hole I, and the dynamic sealing ring is pressed by the flange to seal the rotating component mounting opening.

[0014] The described lower box includes a box body, and a clamping groove and a sealing ring are provided between the box body and the upper cover; the rotating shaft is inserted into the rotating component mounting opening at the lower part of the lower box, and the smaller diameter part above the rotating shaft passes through the rotating component mounting opening and is installed in the key groove through a flat key.

[0015] The housing to be glue-injected has four sides, and each side has two glue-injection potting areas to be filled.

[0016] The described glue injection potting component includes an upper fixing block, a lower fixing block, and a side fixing block; the upper fixing block is buckled on the upper surface of the housing to be glue-injected, and there are a ventilation through hole I and a circular boss on the upper fixing block; the lower fixing block is buckled on the lower surface of the housing to be glue-injected, and there is a ventilation through hole II on the lower fixing block; the glue injection pad is buckled at the side port of the housing to be glue-injected, the side fixing block is buckled outside the glue injection pad, the glue injection joint passes through the through hole II, and the upper row of screws passes through the through hole III and is screwed into the screw hole II of the upper fixing block, and the lower row of screws passes through the through hole IV and is screwed into the screw hole III of the upper fixing block.

[0017] The described rotating component includes a rotating seat, the glue injection potting component is placed on the rotating seat, and there are columns for fixing the glue injection potting component at the four end corners of the rotating seat, and there is a ventilation through hole III on the rotating seat.

[0018] The described rotating component includes a fixed cylinder, the fixed cylinder is sleeved outside the glue injection cylinder to fix the glue injection cylinder; a glue injection joint is provided at the glue injection outlet of the glue injection cylinder, and the glue injection joint is connected to a connecting pipe.

[0019] The process of performing glue injection potting using the described negative pressure centrifugal glue injection potting device includes the following steps:

[0020] 1) Install the glue injection potting component outside the housing to be glue-injected, form a glue injection channel at the position of the glue-injection potting area through the glue injection pad, and at the same time provide a ventilation channel between the glue injection potting component and the housing to be glue-injected;

[0021] 2) Install the glue injection potting component in the upper cover and the lower box through the rotating component; a sealed structure is formed inside the upper cover and the lower box, and the exhaust channel of the sealed structure is connected to an external vacuum pump;

[0022] 3) Drive the rotating assembly through the power mechanism, thereby driving the glue injection and potting assembly to rotate; at the same time, inject glue into the area to be glue-injected and potted through the glue injection and potting assembly;

[0023] 4) When the fluidity of the glue is poor, turn on the external vacuum pump to evacuate the inside of the housing to be glue-injected, and suck the glue in the glue injection cylinder into the housing through negative pressure.

[0024] The beneficial effects of the present invention are as follows:

[0025] 1. There is no need to reserve a glue injection port on the housing to be glue-injected, and there is no restriction on the structure of the housing to be glue-injected, so the applicability is strong;

[0026] 2. After the glue is injected, evacuate the air through the vacuum pump as the driving force for the glue to flow, and the filling effect is good;

[0027] 3. It is applicable to the square housing to be glue-injected, and can inject glue into different areas to be glue-injected and potted simultaneously;

[0028] 4. It can realize zoned glue injection and potting. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic structural diagram of the upper cover;

[0030] Figure 2 It is a schematic structural diagram of the lower box;

[0031] Figure 3 It is a schematic structural diagram of the glue injection and potting assembly;

[0032] Figure 4 It is a cross-sectional view of the structure of the glue injection and potting assembly;

[0033] Figure 5 It is a schematic structural diagram of the rotating assembly;

[0034] Figure 6 It is a schematic diagram of the overall structure of the present invention;

[0035] Figure 7 It is a schematic diagram of the glue injection and potting state of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] A negative pressure centrifugal injection and potting device includes an upper cover 1, a lower box 2, an injection and potting assembly 3, a rotating assembly mounting port 4, and a rotating assembly 6. The upper cover 1 and the lower box 2 form a sealed structure, and the sealed structure is connected to an external vacuum pump through an exhaust passage. The injection and potting assembly 3 is arranged inside the sealed structure and is installed and driven to rotate by the rotating assembly 6.

[0038] Rotating assembly mounting ports 4 are provided at the middle positions of the upper cover 1 and the lower box 2.

[0039] The rotating assembly mounting port 4 includes a stepped groove 46 at the opening. A dynamic seal ring 44 is arranged in the stepped groove 46. A screw I41 passes through a through hole I43 of a flange 42 and is screwed into a screw hole I45, and the dynamic seal ring 44 is pressed by the flange 42 to seal the rotating assembly mounting port 4.

[0040] The structure of the upper cover 1 is as Figure 1 shown. Among them, the upper cover 1 and the flange 42 can be made of transparent acrylic plates. The upper cover 1 is provided with an exhaust through hole 11, and the exhaust through hole 11 is connected to a vacuum pump through a joint and a pipeline.

[0041] The structure of the lower box 2 is as Figure 2 shown. Among them, the box body 23 and the flange 42 can be made of transparent acrylic plates. The smaller-diameter part 25 above the rotating shaft 24 is passed through the dynamic seal ring 44, and then a flat key 26 is installed in a key groove 27.

[0042] The injection and potting assembly 3 is installed outside the shell 5 to be potted with glue, and is provided with a ventilation hole channel connecting the inside of the lower box 2 and the shell 5 to be potted with glue. The ventilation hole channel is arranged at the non-injection surface of the shell 5 to be potted with glue; the glue potting assembly 3 includes an injection pad 36. The injection pad 36 is pressed on the position of the area 51 to be potted with glue by a pressing plate to form an injection channel at the position of the area 51 to be potted with glue; one end of an injection joint 38 is connected to the injection channel, and the other end is connected to an injection cylinder 319 through a connecting pipe 320.

[0043] Specifically, the injection and potting assembly 3 is as Figure 3As shown. The housing 5 to be injected with glue is a square membrane oxygenator or dialyzer housing, which has four sides to be potted, and there are two different potting areas 51 on each side. The upper fixing block 31 is buckled on the upper surface of the housing 5 to be injected with glue. There are four ventilation through holes I 32 and a circular boss 33 on the upper fixing block 31. The lower fixing block 34 is buckled on the lower surface of the housing 5 to be injected with glue. There are four ventilation through holes II 35 on the lower fixing block 34. The glue injection pad 36 is preferably made of a flexible material and can be a silicone rubber glue injection pad. The glue injection pad 36 is buckled at the side port of the housing 5 to be injected with glue. The side fixing block 37 is buckled outside the glue injection pad 36. The glue injection joint 38 passes through the through hole II (39). The upper row of screws 310 passes through the through hole III 311 and is screwed into the screw hole II 312 of the upper fixing block 31. The lower row of screws 313 passes through the through hole IV 314 and is screwed into the screw hole III 315 of the upper fixing block 31. The side end cap assembly I 316, the side end cap assembly II 317, and the side end cap assembly III 318 are combined with the upper fixing block 31 and the lower fixing block 34 in the same way.

[0044] Preferably, as Figure 4 shown, there are raised features 322 on the glue injection pad 36, which have the same contour as the groove features 52 on the housing 5 to be injected with glue, which is beneficial to improving the sealing performance after the glue injection pad 36 is buckled with the housing 5 to be injected with glue. The upper row of screws 310 and the lower row of screws 313 connect the side fixing block 37 with the upper fixing block 31 and the lower fixing block 34. Tightening the screws can tightly buckle the glue injection pad 36 and the housing 5 to be injected with glue together. The glue injection joint 38 is the inlet for the colloid to flow into the potting part of the housing.

[0045] The combination of the rotating assembly 6 and the glue injection potting assembly 3 is as Figure 5 shown. The combined glue injection potting assembly 3 is placed on the rotating base 61. There are columns 62 at the four end corners of the rotating base 61 for fixing the glue injection potting assembly 3. There are four ventilation through holes III 63 on the rotating base 61, and the ventilation through holes III 63 are Figure 3 aligned with the ventilation through holes II 35 of the lower fixing block 34 in

[0046] The overall structure after assembly is as Figure 6 shown.

[0047] When in use, as Figure 7As shown in the figure. The external rotational power causes the rotational assembly 6 to perform a rotational movement through the rotating shaft 24. The smaller-diameter portion 25 above the rotating shaft 24 maintains a sealed state, the dynamic sealing ring 44 and the fixed cylinder 65 maintain a sealed state, and the sealing ring 21 maintains the seal between the upper cover and the box body. While the rotational assembly 6 is rotating, the glue liquid 7 is poured into the glue injection, and the air inside the box is extracted from the exhaust through-hole 11 by a vacuum pump. Under the dual action of centrifugal force and negative pressure, the glue liquid 7 will be injected into the silicone rubber glue injection pad through the silicone rubber connecting pipe and complete the glue injection and potting of the four sides of the square shell.

[0048] Thus, it can be seen that by using the method and device of the present invention for glue injection and potting, there is no need to provide a glue injection port on the shell, and the glue injection and potting can be directly carried out through the silicone rubber glue injection pad; when the fluidity of the glue liquid is poor, sucking the glue liquid in the glue injection cylinder into the shell by negative pressure can ensure a good filling effect; through multiple pipelines, the different sides of the square shell and different areas of the same side can be simultaneously subjected to glue injection and potting.

[0049] Those of ordinary skill in the art should understand that the discussion of any embodiment above is only exemplary and is not intended to imply that the scope of the present disclosure, including the claims, is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, which are not provided in detail for the sake of brevity.

[0050] The embodiments of the present invention are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A negative pressure centrifugal injection and potting device, Characterized in that: The upper cover (1) and the lower box (2) form a sealed structure; the sealed structure is connected to an external vacuum pump through an exhaust passage; inside the lower box (2), there is an injection and potting assembly (3), and the injection and potting assembly (3) is installed concentrically between the upper cover (1) and the lower box (2) through a rotating assembly (6); The injection and potting assembly (3) is installed outside the housing (5) to be injected with glue, and there is a ventilation hole connecting the inside of the lower box (2) and the housing (5) to be injected with glue; the injection and potting assembly (3) includes an injection pad (36), and the injection pad (36) is pressed against the position of the area (51) to be injected and potted by a pressing plate, forming an injection channel at the position of the area (51) to be injected and potted; one end of the injection joint (38) is connected to the injection channel, and the other end is connected to an injection cylinder (319) through a connecting pipe (320); The housing (5) to be injected with glue has four sides, and each side has two areas (51) to be injected and potted; The injection and potting assembly (3) includes an upper fixing block (31), a lower fixing block (34), and a side fixing block (37); The upper fixing block (31) is buckled on the upper surface of the housing (5) to be injected with glue, and there is a ventilation through hole I (32) and a circular boss (33) on the upper fixing block (31); the lower fixing block (34) is buckled on the lower surface of the housing (5) to be injected with glue, and there is a ventilation through hole II (35) on the lower fixing block (34); the injection pad (36) is buckled at the side port of the housing (5) to be injected with glue, the side fixing block (37) is buckled outside the injection pad (36), the injection joint (28) passes through the through hole II (39), and the upper row of screws (310) passes through the through hole III (31) and is screwed into the screw hole II (312) of the upper fixing block (31), and the lower row of screws (313) passes through the through hole IV (314) and is screwed into the screw hole III (315) of the upper fixing block (31).

2. A negative pressure centrifugal injection and potting device according to claim 1, Characterized in that: The injection pad (36) is provided with a raised feature (322), which corresponds to the groove feature (52) on the housing (5) to be injected with glue.

3. A negative pressure centrifugal injection and potting device according to claim 1, Characterized in that: Rotating assembly mounting ports (4) are provided at the middle positions of the upper cover (1) and the lower box (2).

4. A negative pressure centrifugal injection and potting device according to claim 3, Characterized in that: The rotating assembly mounting port (4) includes a stepped groove (46) at the opening, and a dynamic sealing ring (44) is provided in the stepped groove (46). The screw I (41) passes through the through hole I (43) of the flange (42) and is screwed into the screw hole I (45), and the dynamic sealing ring (44) is pressed by the flange (42) to seal the rotating assembly mounting port (4).

5. A negative pressure centrifugal injection and potting device according to claim 1, Characterized in that: The described lower box (2) includes a box body (23), and a clamping groove (22) and a sealing ring (21) are provided between the box body (23) and the upper cover (1); the rotating shaft (24) is inserted from the rotating component installation port (4) at the lower part of the lower box (2), and the smaller-diameter part (25) above the rotating shaft (24) passes through the rotating component installation port (4) and is installed in the key groove (27) through a flat key (26).

6. A negative pressure centrifugal injection and potting device according to claim 1, characterized in that: The described rotating component (6) includes a rotating seat (61), the injection and potting component (3) is placed on the rotating seat (61), and there are columns (62) for fixing the injection and potting component (3) at the four end corners of the rotating seat (61), and an air vent through hole III (63) is provided on the rotating seat (61).

7. A negative pressure centrifugal injection and potting device according to claim 1, characterized in that: The described rotating component (6) includes a fixed cylinder (65), the fixed cylinder (65) is sleeved outside the injection cylinder (319) to fix the injection cylinder (319); an injection joint (321) is provided at the injection outlet of the injection cylinder (319), and the injection joint (321) is connected to a connecting pipe (320).

8. A process for injection and potting using the negative pressure centrifugal injection and potting device according to any one of claims 1-7, characterized in that, its steps are as follows: 1) Install the injection and potting component (3) outside the housing (5) to be injected, and form an injection channel at the position of the area (51) to be injected and potted through the injection pad (36). At the same time, an air vent channel is provided between the injection and potting component (3) and the housing (5) to be injected; 2) Install the injection and potting component (3) in the upper cover (1) and the lower box (2) through the rotating component (6); a sealed structure is formed inside the upper cover (1) and the lower box (2), and the exhaust channel of the sealed structure is connected to an external vacuum pump; 3) Drive the rotating component (6) through the power mechanism, thereby driving the injection and potting component (3) to rotate; at the same time, inject glue into the area (51) to be injected and potted through the injection and potting component (3); 4) When the fluidity of the glue is poor, turn on the external vacuum pump to evacuate the inside of the housing (5) to be injected, and suck the glue in the injection cylinder into the housing through negative pressure.

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