Sealing structure of negative pressure cooling water tank

Abstract

The utility model relates to the technical field of sealing assemblies, in particular to a sealing structure of a negative pressure cooling water tank. The profile shaping device comprises a shaping block and a shaping through hole which is formed in the shaping block and used for a profile to penetrate through, containing grooves which are connected end to end are coaxially formed in the inner circumference of the shaping through hole, and groove openings of the containing grooves face inwards; a sealing strip is arranged in an inner cavity of the containing groove, the head and the tail of the sealing strip are not fixed, the sealing strip is of a hollow structure internally provided with an inflation cavity, when the inflation cavity is in an inflation state, the sealing strip fills the containing groove and protrudes out of a groove opening of the containing groove, and a sealing area wrapping the periphery of the profile is defined by the protruding portion of the sealing strip. On the premise of ensuring that the penetrating part of the section bar and the upper component of the cooling water tank has a good sealing effect, the sealing structure has the advantages that the section bar can conveniently penetrate through the sealing structure at the penetrating part, and the friction force between the sealing structure at the penetrating part and the periphery of the section bar is adjustable.

Description

Technical Field

[0001] This utility model relates to the field of sealing component technology, specifically a sealing structure for a negative pressure cooling water tank. Background Technology

[0002] Cooling water tanks are one of the main components of extruder plastic processing production lines, used to cool the profiles extruded by the extruder.

[0003] In actual extrusion production, the cooling water tank provides a stable negative pressure environment, which improves the output efficiency of the extruded profile. Therefore, the cooling water tank often adopts the form of a negative pressure vacuum cooling water tank. To ensure a good negative pressure vacuum environment, high requirements are often placed on the sealing performance of the components penetrating the profile within the cooling water tank. For example, the text of Chinese Patent Publication No. CN206825888U, entitled "An Extruder with a Novel Water Tank Structure," describes the use of an annular isolation plate at the profile penetration point for sealing between the components inside the water tank on the outer periphery of the profile.

[0004] In practical applications, to ensure a good seal, the sealing separator is often made of rubber or silicone. Under normal conditions, the inner circumference of the separator is usually slightly smaller than the outer circumference of the profile to ensure a tight seal between the separator and the profile. However, the structural design of these rubber or silicone separators makes it difficult for the initial section of the profile to pass through the separator's inner cavity. Furthermore, during the profile extrusion process, the friction between the separator and the profile is significantly affected by the separator's machining precision, resulting in uncontrollable friction. Therefore, this issue urgently needs to be addressed. Utility Model Content

[0005] In order to avoid and overcome the technical problems existing in the prior art, this utility model provides a sealing structure for a negative pressure cooling water tank. While ensuring a good sealing effect at the penetration point between the profile and the components on the cooling water tank, it also has the advantages of facilitating the profile to pass through the sealing structure at the penetration point and the adjustable friction force between the sealing structure at the penetration point and the outer periphery of the profile.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A sealing structure for a negative pressure cooling water tank includes a shaping block and a shaping through hole on the shaping block for a profile to pass through. The inner circumference of the shaping through hole is coaxially provided with a receiving groove connected end to end, and the groove opening faces inward. A sealing strip is arranged in the inner cavity of the receiving groove. The sealing strip is not fixed to each other at its ends. The sealing strip is a hollow structure with an internal air chamber. When the air chamber is in an inflated state, the sealing strip fills the receiving groove and protrudes outside the groove opening. The protruding part of the sealing strip surrounds and forms a sealing area that wraps around the outer circumference of the profile.

[0008] As a further embodiment of this utility model: the opening of the receiving groove is constricted, and a protruding strip is provided on one side of the sealing strip adjacent to the opening of the receiving groove. The thickness of the protruding strip is adapted to the width of the opening of the receiving groove, and the protrusion is formed by the outside of the protruding strip.

[0009] As a further embodiment of this utility model: the cross-section of the receiving groove is composed of a circular cavity with an opening on one side and a rectangular cavity communicating with the opening side of the circular cavity, and the opening width of the circular cavity is smaller than the diameter of the receiving groove, and the rectangular cavity forms the constricted groove in the receiving groove.

[0010] As a further improvement of this utility model: the bottom of the receiving groove is connected to an extension groove, and the first and last ends of the sealing strip extend into the extension groove.

[0011] As a further embodiment of this utility model: the shaping block includes a main plate and a secondary plate whose surfaces are fixed together, and the mating sides of the main plate and the secondary plate each have an inner recess for enclosing and forming a receiving groove.

[0012] As a further improvement of this utility model, it also includes an air filling and air filling assembly, wherein the first and last ends of the sealing strip are connected to the air pile of the air filling and air filling assembly.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. The sealing strip adopts a non-connected structure at both ends, and has a hollow inflation chamber inside. When the chamber is not inflated, the sealing strip contracts completely into the receiving groove to avoid the profile passing through the shaping through hole. After the profile passes through the through hole, the inflation chamber is inflated, and the protruding part of the sealing strip expands out of the receiving groove to form a sealing area around the profile, ensuring effective sealing at the gap between the shaping through hole and the profile. Furthermore, by adjusting the inflation pressure in the chamber, the friction between the sealing strip and the profile can be adjusted, thus reducing the resistance of the profile passing through the shaping channel while ensuring sufficient sealing between the sealing strip and the profile.

[0015] 2. The constricted groove design of the receiving groove makes it difficult for the sealing strip to come out of the receiving groove when it is inflated; in addition, the convex strip on the sealing strip can only protrude from the constricted groove, which also effectively prevents the contact surface from being reduced and reduces the friction between the rubber strip and the product. At the same time, the solid structure of the convex strip increases its wear resistance and extends its service life.

[0016] 3. The cross-section of the receiving groove adopts a combination of circular and rectangular cavities, which makes the receiving groove fit better with the circular cavity part of the receiving groove when it is inflated. In addition, the side wall of the rectangular cavity can better support the side wall of the protruding strip in the part of the protruding strip, ensuring the stability of the protruding strip in the sealed state.

[0017] 4. The cavity of the receiving groove is connected to an extension groove, and the first and last ends of the sealing strip extend into the extension groove, so that the length of the sealing strip in the deflated state is greater than the perimeter of the longitudinal section of the receiving groove, ensuring that the sealing strip can stably fill the receiving groove in the inflated state.

[0018] 5. Both the main board and the sub-board have recessed parts on their mating sides to form a receiving groove, which effectively reduces the difficulty of creating the receiving groove compared to directly opening the receiving groove on the inner circumference of the shaping block.

[0019] 6. Both the beginning and end of the sealing strip are connected to the air pile of the inflation and deflation assembly to realize the automatic synchronous air intake and exhaust of the beginning and end of the sealing strip, which improves the convenience of inflation and deflation of the sealing strip. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall assembly structure of this utility model.

[0021] Figure 2 This is a side view of the assembly structure of this utility model.

[0022] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure along section AA.

[0023] Figure 4 for Figure 3 A magnified schematic diagram of the structure at point A.

[0024] Figure 5 for Figure 3 A magnified schematic diagram of the structure at point B.

[0025] Figure 6 This is a schematic diagram of the sealing strip in the receiving groove under normal conditions in this utility model.

[0026] Figure 7 This is a schematic diagram of the structure of the sealing strip in the receiving groove when it is inflated.

[0027] Figure 8 This is a schematic diagram of the eccentric handle in the locked state of the overall assembly structure of this utility model.

[0028] Figure 9 This is a schematic diagram of the eccentric handle in the unlocked state of the overall assembly structure of this utility model.

[0029] Figure 10 for Figure 9 A magnified structural diagram of point C.

[0030] In the diagram: 10. Housing; 11. Sealing ring; 111. Hollow cavity; 112. Plug; 12. Guide groove; 13. Slot; 20. Shaping block; 21. Main board; 22. Sub-board; 221. Extension groove; 23. Receiving groove; 30. Eccentric handle; 40. Inflation and deflation assembly; 50. Sealing strip; 51. Raised strip; 52. Inflation chamber; a. Profile. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] For ease of understanding, the specific structure and working method of this utility model are further described below with reference to the accompanying drawings:

[0033] The specific structure of this utility model is as follows: Figure 1-10 As shown, its main structure includes a housing 10, shaping blocks 20 distributed inside the openings at both ends of the housing 10, and a sealing ring 11 located between the shaping blocks 20 and the housing 10. Each end of the side wall of the housing 10 is hinged with an eccentric handle 30, the hinge axis of which is perpendicular to the length of the housing 10. The eccentric handle 30 has an abutment end that pushes the shaping blocks 20 to press against the sealing ring 11. When the eccentric handle 30 is rotated, as... Figure 9 As shown, the abutting end rotates eccentrically toward the shaping block 20 to push the shaping block 20 to press and lock the sealing ring 11, or as... Figure 8 As shown, the abutting end rotates eccentrically away from the shaping block 20 to unlock. Specifically, as... Figure 8 and Figure 9 As shown, the end face of the abutting end is an abutting plane that can abut against the shaping block 20 to prevent the eccentric handle 30 from rotating. Since the abutting plane of the abutting end transitions to abutting against the shaping block 20, there will inevitably be a springback process after the shaping block 20 moves towards the sealing ring 11. In this application, the sealing ring 11 uses rubber or silicone sealing materials commonly used in the prior art. The sealing ring 11 has a hollow cavity 111 inside. The elastic deformation generated by the hollow cavity 111 after the sealing ring 11 is compressed forms an elastic floating gap where the abutting end transitions to the abutting plane and fits against the shaping block 20. The specific installation process is as follows: In the initial unlocked state, the eccentric handle 30... Figure 8As shown, as the abutting end of the eccentric handle 30 rotates toward the shaping block 20, it gradually pushes the shaping block 20 toward the sealing ring 11 until the edge of the abutting plane in the abutting end abuts against the shaping block 20. At this time, the shaping block 20 reaches the maximum stroke point where the abutting end pushes it toward the sealing ring 11. At this time, the elastic floating gap formed by the hollow cavity 111 of the sealing ring 11 is compressed to the extreme. After that, the abutting end of the eccentric handle 30 continues to rotate toward the sealing ring 11 until the abutting plane is parallel to the pressure surface of the shaping block 20. At this time, there is a gap between the shaping block 20 and the abutting plane. After the hollow cavity 111 of the sealing ring 11 expands, it pushes the shaping block 20 back toward the abutting plane to form a locking state in which the elastic compression shaping block 20 and the abutting plane are pressed together and prevent the eccentric handle 30 from rotating. In this state, the compression between the shaping block 20 and the sealing ring 11 is ensured, and the eccentric handle 30 and the shaping block 20 are locked together surface to surface, ensuring the stability of the shaping block 20 installation state.

[0034] Of course, in actual implementation, the sealing ring 11 can also be configured to have a structure without a hollow cavity 111. The deformation of its material itself can also form a floating gap where the sealing ring 11 abutting end transitions to the abutting plane and fits with the shaping block 20.

[0035] Based on the above, such as Figure 10 As shown, the sidewall of the sealing ring 11 has a plug 112 with a T-shaped cross-section, and the T-shaped head of the plug 112 is arc-shaped. The inner end wall of the housing 10 or the outer end wall of the shaping block 20 has a slot 13 for inserting the plug 112, and the width of the slot 13 is adapted to the distance between the two sides of the T-shaped head of the plug 112. The arc-shaped structure of the T-shaped head of the plug 112 can reduce the frictional resistance when the plug 112 is inserted into the slot 13 and increase the frictional resistance during the separation process of the plug 112 from the slot 13, effectively ensuring the convenience and stability of the sealing ring 11 in the housing 10 or the shaping block 20.

[0036] Furthermore, such as Figure 1 and Figure 3 As shown, both ends of the side wall of the housing 10 have guide grooves 12 for inserting and installing the shaping block 20. The width of the guide grooves 12 has an installation gap for the floating of the shaping block 20. The guide grooves 12 provide initial positioning for the shaping block 20, and the installation gap ensures that the shaping block 20 can generate a floating action that compresses the sealing ring 11 during installation.

[0037] In addition, such as Figure 2As shown, the eccentric handles 30 at each end of the housing 10 are configured as two sets distributed on at least two separate sidewalls inside the housing 10. This reduces the space occupied by the eccentric handles 30 while ensuring the uniformity of the contact force between the eccentric handles 30 and the shaping block 20. In actual implementation, the eccentric handles 30 can also adopt a wide structure, with the eccentric handles 30 located near the center of the shaping block 20, which can also achieve good clamping of the shaping block 20.

[0038] It is worth mentioning that this application also provides an improved sealing solution between the shaping block 20 and the profile a. Specifically, as shown in the example... Figure 3-7 As shown, the shaping block 20 has a shaping through hole for the profile a to pass through. A receiving groove 23, connected end-to-end, is coaxially arranged on the inner circumference of the shaping through hole, with the opening of the receiving groove 23 facing inwards. A sealing strip 50 is arranged inside the receiving groove 23. The sealing strip 50 is not fixed to each other at its ends. The sealing strip 50 is a hollow structure with an internal inflation chamber 52. When the inflation chamber 52 is inflated, the sealing strip 50 fills the receiving groove 23 and protrudes beyond the opening of the receiving groove 23, forming a sealing area that surrounds the outer circumference of the profile a. In this application, the sealing strip 50 is a commonly used rubber sealing material in the prior art, which not only has a good sealing effect but also good elasticity. Furthermore, the sealing strip 50 adopts a non-connected structure at both ends, and a hollow inflation chamber 52 is set inside the sealing strip 50. When the inflation chamber 52 is not inflated, the sealing strip 50 can be completely retracted into the receiving groove 23 by contracting in the uninflated state, so as to avoid the profile a passing through the shaping through hole. After the profile a passes through the avoidance through hole, by inflating the inflation chamber 52, the protrusion of the sealing strip 50 outside the receiving groove 23 is used to form a sealing area that surrounds the outer periphery of the profile a, which can ensure effective sealing of the gap between the shaping through hole and the profile a. In addition, by adjusting the inflation pressure in the inflation chamber 52, the friction between the sealing strip 50 and the profile a can be adjusted, which can reduce the resistance of the profile a passing through the shaping channel while ensuring sufficient sealing between the sealing strip 50 and the profile a.

[0039] Based on the above, such as Figure 4 and Figure 5 As shown, the opening of the receiving groove 23 is constricted, and the sealing strip 50 has a protruding strip 51 on one side adjacent to the opening of the receiving groove 23. The thickness of the protruding strip 51 is adapted to the width of the opening of the receiving groove 23, and the outer part of the protruding strip 51 forms a protrusion. When the uninflated chamber 52 is in a deflated state, as... Figure 4 As shown, the protrusion 51 retracts into the receiving groove 23, and the inflation chamber 52 is in an inflated state, as... Figure 5As shown, the protrusion 51 extends beyond the opening of the receiving groove 23 to achieve a seal with the profile a. The constricted opening design of the receiving groove 23 makes it difficult for the sealing strip 50 to detach from the receiving groove 23 when inflated; in addition, the protrusion 51 on the sealing strip 50 can only protrude from the constricted opening, which also effectively prevents the reduction of the contact area and the friction between the rubber strip and the product. At the same time, the solid structure of the protrusion 51 increases its wear resistance and extends its service life.

[0040] Furthermore, such as Figure 4 and Figure 5 As shown, the cross-section of the receiving groove 23 consists of a circular cavity with an opening on one side and a rectangular cavity communicating with the opening side of the circular cavity. The opening width of the circular cavity is smaller than the diameter of the receiving groove 23, and the rectangular cavity forms the constricted opening of the receiving groove 23. The cross-section of the receiving groove 23 adopts a structure formed by the combination of a circular cavity and a rectangular cavity, which makes the receiving groove 23 fit better with the circular cavity portion of the receiving groove 23 in the inflated state. In addition, the sidewall of the rectangular cavity can better support the sidewall of the protruding strip 51 in the portion of the protruding strip 51, ensuring the stability of the protruding strip 51 in the sealed state.

[0041] Based on the above, such as Figure 6 and Figure 7 As shown, the cavity of the receiving groove 23 is connected to the extension groove 221. The first and last ends of the sealing strip 50 extend into the extension groove 221, so that the length of the sealing strip 50 in the deflated state is greater than the perimeter of the longitudinal section of the receiving groove 23, ensuring that the sealing strip 50 can stably fill the receiving groove 23 in the inflated state. Of course, in actual implementation, the length of the sealing strip 50 in the deflated state is also less than the perimeter of the longitudinal section of the receiving groove 23. The sealing strip 50 can be inflated to fill the receiving groove 23. In this state, the ductility of the sealing strip 50 material needs to be considered, and the sealing strip 50 is prone to over-expansion, which will affect the service life of the sealing strip 50.

[0042] Based on the above, such as Figure 3-5 As shown, the shaping block 20 includes a main plate 21 and a secondary plate 22 whose surfaces are fixed together. The mating sides of the main plate 21 and the secondary plate 22 both have recesses for forming a receiving groove 23. Compared with directly opening the receiving groove 23 on the inner circumference of the shaping block 20, the difficulty of opening the receiving groove 23 is effectively reduced.

[0043] Furthermore, this application also includes an inflation / deflation assembly 40, with both the first and last ends of the sealing strip 50 connected to the air pile of the inflation / deflation assembly 40. This allows for automated, synchronized air intake and exhaust at the first and last ends of the sealing strip 50, improving the convenience of inflation / deflation of the sealing strip 50. Specifically, the inflation / deflation assembly 40 can be an air pump with a valve, as is available in the prior art, capable of inflating the inflation chamber 52 of the sealing strip 50, sealing it after inflation, and venting the air.

[0044] Of course, those skilled in the art will recognize that this invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0045] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0046] The technologies, shapes, and structures not described in detail in this utility model are all known technologies.

Claims

1. A sealing structure of a negative pressure cooling water tank, characterized by, The profiled block (20) comprises a profiled block (20) and a profiled through hole for the profile (a) to pass through, the inner periphery of the profiled through hole is coaxially provided with a head-to-tail accommodating groove (23), and the groove opening of the accommodating groove (23) faces inward; the inner cavity of the accommodating groove (23) is arranged with a sealing strip (50), the head and tail of the sealing strip (50) are not fixed to each other, the sealing strip (50) is a hollow structure with an inflation cavity (52) inside, when the inflation cavity (52) is in an inflated state, the sealing strip (50) fills the accommodating groove (23) and protrudes out of the groove opening of the accommodating groove (23), and the protruding part of the sealing strip (50) forms a sealing area surrounding the outer periphery of the profile (a).

2. The sealing structure of a negative pressure cooling water tank according to claim 1, wherein The groove opening of the accommodating groove (23) is a closed opening, one side of the sealing strip (50) adjacent to the groove opening of the accommodating groove (23) is provided with a convex strip (51), the thickness of the convex strip (51) is matched with the width of the groove opening of the accommodating groove (23), and the outer part of the convex strip (51) constitutes the protruding part.

3. The sealing structure of a negative pressure cooling water tank according to claim 2, wherein The cross section of the accommodating groove (23) is composed of a circular cavity with one side open and a rectangular cavity in communication with the open side of the circular cavity, and the opening width of the circular cavity is smaller than the diameter of the accommodating groove (23), and the rectangular cavity constitutes the closed opening of the accommodating groove (23).

4. The sealing structure of a negative pressure cooling water tank according to claim 1 or 2 or 3, characterized in that, The groove bottom of the accommodating groove (23) is communicated with an extension groove (221), and the head end and tail end of the sealing strip (50) extend into the extension groove (221).

5. The sealing structure of a negative pressure cooling water tank according to claim 1 or 2 or 3, characterized in that, The profiled block (20) comprises a main plate (21) and a secondary plate (22) with their plate surfaces fixedly attached to each other, and the attached sides of the main plate (21) and the secondary plate (22) are provided with inner recesses for forming the accommodating groove (23).

6. The sealing structure of a negative pressure cooling water tank according to claim 1 or 2 or 3, characterized in that, The profiled block (20) further comprises a gas charging and discharging assembly (40), and the head end and tail end of the sealing strip (50) are communicated with the gas pile of the gas charging and discharging assembly (40).

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