Single-point needle valve type hot runner

Abstract

The utility model discloses a single-point needle valve type hot runner which comprises a cylinder cover, a cylinder body, a base, a piston, a first sealing ring, a first nozzle, a first heating ring, a second nozzle, a second heating ring, a valve needle and a water conveying sleeve, a sealing cavity is formed among the cylinder cover, the cylinder body and the base; the piston is arranged in the sealing cavity; the first sealing ring is sleeved on the piston; the first nozzle is located in the sealing cavity and installed on the piston, and a first channel is formed in the first nozzle; the first heating ring is wound on the outer side wall of the first nozzle; one end of the second nozzle penetrates through the base and extends into the sealing cavity to be connected with the piston, and a second channel and a third channel which are communicated are formed in the second nozzle; the cylinder body is sleeved with the water conveying sleeve, and a water channel is formed in the water conveying sleeve. The water channel is arranged in the water conveying sleeve, so that cooling liquid in the water channel can absorb heat generated by the first heating ring and the second heating ring, heat transmitted to the sealing ring is reduced, the aging speed of the sealing ring is slowed down, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of hot runners, in particular to a single-point needle valve type hot runner. Background Art

[0002] In the related art, a single-point needle valve hot runner usually drives the valve needle in the middle of the hot nozzle to move up and down through an air cylinder or an oil cylinder to allow the melt to enter the cavity and close the glue inlet. However, since there is a heating element inside the hot nozzle, the heat generated by the heating element will accelerate the aging speed of the sealing ring in the air cylinder or the oil cylinder and shorten its service life.

[0003] Therefore, the existing technology needs to be improved and developed. Utility Model Content

[0004] The utility model aims to provide a single-point needle valve type hot runner, which can slow down the aging speed of the sealing ring and prolong the service life.

[0005] The utility model provides a single-point needle valve hot runner, which includes: a cylinder cover, a cylinder body, a base, a piston, a first sealing ring, a first nozzle, a first heating coil, a second nozzle, a second heating coil, a valve needle and a water transport sleeve; one end of the cylinder body is connected to the cylinder cover, and the other end of the cylinder body is connected to the base, and a sealed cavity is formed between the cylinder cover, the cylinder body and the base; the piston is arranged in the sealed cavity and can move in the sealed cavity; the first sealing ring is sleeved on the piston and abuts against the inner side wall of the cylinder body; the first nozzle is located in the sealed cavity and Installed on the piston, the first nozzle has a first channel inside; the first heating coil is wound around the outer wall of the first nozzle; one end of the second nozzle passes through the base and extends into the sealed cavity to be connected to the piston, the second nozzle has a second channel and a third channel connected inside, and the second channel is connected to the first channel; the second heating coil is wound around the outer wall of the second nozzle; one end of the valve needle is connected to the piston, and the other end of the valve needle passes through the third channel; the water transport jacket is sleeved on the cylinder body, and the water transport jacket has a water channel inside.

[0006] According to an embodiment of the present utility model, a groove is provided on the inner side wall of the water transport jacket, and the groove forms the water channel.

[0007] According to an embodiment of the present utility model, the water transport jacket is provided with a water inlet and a water outlet, and both the water inlet and the water outlet are connected to the water channel.

[0008] According to one embodiment of the present utility model, a partition is provided in the water channel, and the water inlet and the water outlet are respectively located on both sides of the partition.

[0009] According to an embodiment of the present utility model, a second sealing ring is provided on the inner side wall of the water transport jacket, and the second sealing ring abuts against the outer side wall of the cylinder body.

[0010] According to an embodiment of the present utility model, an outer side wall of one end of the cylinder body is provided with an extension portion extending outward, and one end of the water transport jacket abuts against the extension portion.

[0011] According to an embodiment of the present invention, a mounting position is formed at one end of the second nozzle, a valve needle sleeve is arranged in the mounting position, and the valve needle passes through the valve needle sleeve.

[0012] According to an embodiment of the present utility model, one end of the piston is provided with an isolation sleeve, and one end of the first nozzle is located in the isolation sleeve.

[0013] According to one embodiment of the utility model, the outer wall of the isolation sleeve is provided with a third sealing ring, and the third sealing ring abuts against the inner wall of the cylinder body.

[0014] According to an embodiment of the present utility model, a side of the base close to the cylinder cover has an annular sleeve, and one end of the second nozzle is located in the annular sleeve.

[0015] The beneficial effects of the utility model are as follows: the single-point needle valve type hot runner of the utility model is provided with a water transport jacket having a water channel on the cylinder body, so that the coolant in the water channel can absorb the heat generated by the first heating coil and the second heating coil, so that the heat transferred to the sealing ring is reduced, thereby slowing down the aging speed of the sealing ring and extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 It is a structural schematic diagram of a single-point needle valve hot runner in an embodiment of the utility model;

[0018] Figure 2 It is a cross-sectional view of a single-point needle valve hot runner in an embodiment of the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the water transport jacket in the embodiment of the utility model;

[0020] Figure 4 It is a cross-sectional view of the water transport jacket in the embodiment of the utility model.

[0021] Description of reference numerals:

[0022] 1. Cylinder head; 2. Cylinder body; 21. Extension; 3. Base; 31. Annular sleeve; 4. Piston; 41. Isolation sleeve; 5. First sealing ring; 6. First nozzle; 61. First channel; 7. First heating coil; 8. Second nozzle; 81. Second channel; 82. Third channel; 83. Installation position; 9. Second heating coil; 10. Valve needle; 11. Water transport sleeve; 111. Groove; 112. Water inlet; 113. Water outlet; 12. Sealing chamber; 13. Partition; 14. Second sealing ring; 15. Valve needle sleeve; 16. Third sealing ring; 17. Mounting flange. DETAILED DESCRIPTION

[0023] The following will disclose multiple embodiments of the present invention with drawings. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. In other words, in some embodiments of the present invention, these practical details are not necessary. In addition, in order to simplify the drawings, some conventional structures and components will be depicted in a simple schematic manner in the drawings.

[0024] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0025] In addition, in the present utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present utility model. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0026] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0027] like Figure 1 as well as Figure 2As shown, the utility model provides a single-point needle valve hot runner, including a cylinder head 1, a cylinder body 2, a base 3, a piston 4, a first sealing ring 5, a first nozzle 6, a first heating coil 7, a second nozzle 8, a second heating coil 9, a valve needle 10 and a water transport sleeve 11. One end of the cylinder body 2 is connected to the cylinder head 1, and the other end of the cylinder body 2 is connected to the base 3. A sealed cavity 12 is formed between the cylinder head 1, the cylinder body 2 and the base 3. The piston 4 is arranged in the sealed cavity 12 and can move in the sealed cavity 12. The first sealing ring 5 is sleeved on the piston 4 and abuts against the inner side wall of the cylinder body 2. The first nozzle 6 is located in the sealed cavity 12 and is installed on the piston 4. The first nozzle 6 has a first channel 61 inside. The first heating coil 7 is wound around the outer side wall of the first nozzle 6. One end of the second nozzle 8 extends into the sealed cavity 12 through the base 3 and is connected to the piston 4. The second nozzle 8 has a second channel 81 and a third channel 82 connected inside. The second channel 81 is connected to the first channel 61. The second heating coil 9 is wound around the outer wall of the second nozzle 8. One end of the valve needle 10 is connected to the piston 4, and the other end of the valve needle 10 passes through the third channel 82. The water transport jacket 11 is sleeved on the cylinder body 2, and a water channel is provided in the water transport jacket 11.

[0028] In specific applications, there is coolant in the water channel. When the single-point needle valve hot runner is working, the coolant can absorb the heat generated by the first heating coil 7 and the second heating coil 9, so that the heat transferred to the first sealing ring 5 is reduced, thereby slowing down the aging speed of the first sealing ring 5 and extending the service life. It is understandable that there are other sealing rings in the single-point needle valve hot runner, such as the connection between the cylinder body 2 and the cylinder head 1 and the connection between the cylinder body 2 and the base 3 are both provided with sealing rings in order to achieve a good sealing effect, and the above technical solution can also reduce the heat transferred to the sealing rings provided at the connection between the cylinder body 2 and the cylinder head 1 and the sealing rings provided at the connection between the cylinder body 2 and the base 3, so as to extend their service life.

[0029] In some preferred embodiments, the inner wall of the water transport jacket 11 is provided with a groove 111, and the groove 111 forms a water channel. In specific applications, by providing the groove 111 on the inner wall of the water transport jacket 11 to form a water channel, the water channel is in direct contact with the cylinder body 2, which can achieve a better cooling effect.

[0030] like Figure 3 As shown, in some preferred embodiments, the water transport jacket 11 has a water inlet 112 and a water outlet 113, and both the water inlet 112 and the water outlet 113 are connected to the water channel. In specific applications, by providing the water inlet 112 and the water outlet 113 on the water transport jacket 11, the coolant can enter the water channel from the water inlet 112, and be discharged from the water outlet 113 after absorbing heat. In this way, new coolant is circulated into the water channel, so that the coolant continuously absorbs heat and takes the heat out, further improving the cooling effect.

[0031] like Figure 3 and Figure 4 As shown, in some preferred embodiments, a baffle 13 is provided in the water channel, and the water inlet 112 and the water outlet 113 are respectively located on both sides of the baffle 13. In specific applications, when the water transport jacket 11 is sleeved on the cylinder body 2, the baffle 13 abuts against the outer wall of the cylinder body 2, and when the coolant flows in the water channel, the baffle 13 blocks the coolant, so that the coolant that has flowed to the water outlet 113 flows out directly from the water outlet 113, and will not be affected by the new coolant newly injected from the water inlet 112 and continue to flow in the water channel. In this way, the water channel is always filled with new coolant to absorb more heat, thereby achieving a better cooling effect.

[0032] In some preferred embodiments, the inner wall of the water transport jacket 11 is provided with a second sealing ring 14, which abuts against the outer wall of the cylinder body 2. In specific applications, the second sealing ring 14 seals the gap between the water transport jacket 11 and the cylinder body 2 to prevent coolant leakage.

[0033] It is understandable that the provision of the water transport jacket 11 can also reduce the heat transferred to the second sealing ring 14, so as to slow down the aging speed of the second sealing ring 14 and extend its service life.

[0034] In some preferred embodiments, an outer side wall of one end of the cylinder body 2 is provided with an extension portion 21 extending outward, and one end of the water transport jacket 11 abuts against the extension portion 21. In specific applications, by providing the extension portion 21 on the cylinder body 2, the extension portion 21 can play a positioning role for the water transport jacket 11, so that the water transport jacket 11 can be quickly installed at a predetermined position on the cylinder body 2.

[0035] In some preferred embodiments, a mounting position 83 is formed at one end of the second nozzle 8, a valve needle sleeve 15 is arranged in the mounting position 83, and the valve needle 10 passes through the valve needle sleeve 15. In specific applications, by providing the mounting position 83 at one end of the second nozzle 8 and arranging the valve needle sleeve 15 in the mounting position 83, the valve needle sleeve 15 can guide and protect the valve needle 10, so as to prevent the valve needle 10 from being deformed or damaged in a high temperature and high pressure environment.

[0036] In some preferred embodiments, one end of the piston 4 has a spacer sleeve 41, and one end of the first nozzle 6 is located in the spacer sleeve 41. In specific applications, the spacer sleeve 41 plays an isolating role to prevent the hydraulic oil in the sealing chamber 12 from contacting the first heating coil 7 wound around the outer wall of the first nozzle 6; in addition, the spacer sleeve 41 can also play a role in positioning and fixing the first nozzle 6.

[0037] In some preferred embodiments, the outer wall of the isolation sleeve 41 is provided with a third sealing ring 16, and the third sealing ring 16 abuts against the inner wall of the cylinder body 2. In specific applications, the third sealing ring 16 is used to seal the gap between the isolation sleeve 41 and the cylinder body 2 to prevent the hydraulic oil in the sealing chamber 12 from entering the isolation sleeve 41 through the gap between the isolation sleeve 41 and the cylinder body 2 and contacting the first heating coil 7 wound around the outer wall of the first nozzle 6.

[0038] It can be understood that the provision of the water transport jacket 11 can also reduce the heat transferred to the third sealing ring 16, so as to slow down the aging speed of the third sealing ring 16 and extend its service life.

[0039] In some preferred embodiments, the base 3 has an annular sleeve 31 on one side close to the cylinder head 1, and one end of the second nozzle 8 is located in the annular sleeve 31. In specific applications, the shape of the annular sleeve 31 is adapted to the shape of one end of the second nozzle 8, so that one end of the second nozzle 8 can be well limited to ensure that the second channel 81 corresponds precisely to the first channel 61.

[0040] In some preferred embodiments, the above-mentioned single-point needle valve hot runner further includes a mounting flange 17, and the cylinder head 1 is disposed on the mounting flange 17. In specific applications, the single-point needle valve hot runner can be firmly mounted at a predetermined position through the mounting flange 17.

[0041] To sum up, in one or more embodiments of the utility model, the single-point needle valve hot runner of the utility model is provided with a water transport jacket having a water channel on the cylinder body, so that the cold water entering the water channel can absorb the heat generated by the first heating coil and the second heating coil, so that the heat transferred to the sealing ring is reduced, thereby slowing down the aging speed of the sealing ring and extending the service life.

[0042] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A single-point needle valve hot runner, characterized in that: include: A cylinder head (1), a cylinder body (2), a base (3), a piston (4), a first sealing ring (5), a first nozzle (6), a first heating coil (7), a second nozzle (8), a second heating coil (9), a valve needle (10) and a water transport sleeve (11); one end of the cylinder body (2) is connected to the cylinder head (1), the other end of the cylinder body (2) is connected to the base (3), and a sealing chamber (12) is formed among the cylinder head (1), the cylinder body (2) and the base (3); the piston (4) is arranged in the sealing chamber (12) and can move in the sealing chamber (12); the first sealing ring (5) is sleeved on the piston (4) and abuts against the inner wall of the cylinder body (2); the first nozzle (6) is located in the sealing chamber (12) and is installed on the piston ( 4), the first nozzle (6) has a first channel (61) inside; the first heating coil (7) is wound around the outer wall of the first nozzle (6); one end of the second nozzle (8) passes through the base (3) and extends into the sealing cavity (12) to be connected with the piston (4), the second nozzle (8) has a second channel (81) and a third channel (82) inside, and the second channel (81) is connected with the first channel (61); the second heating coil (9) is wound around the outer wall of the second nozzle (8); one end of the valve needle (10) is connected with the piston (4), and the other end of the valve needle (10) passes through the third channel (82); the water transport jacket (11) is sleeved on the cylinder body (2), and the water transport jacket (11) has a water channel inside.

2. The single-point needle valve hot runner according to claim 1, characterized in that: The inner side wall of the water transport jacket (11) is provided with a groove (111), and the groove (111) forms the water channel.

3. The single-point needle valve hot runner according to claim 1, characterized in that: The water transport jacket (11) is provided with a water inlet (112) and a water outlet (113), and the water inlet (112) and the water outlet (113) are both in communication with the water channel.

4. The single-point needle valve hot runner according to claim 3, characterized in that: A partition (13) is provided in the water channel, and the water inlet (112) and the water outlet (113) are respectively located on two sides of the partition (13).

5. The single-point needle valve hot runner according to claim 2, 3 or 4, characterized in that: The inner side wall of the water transport jacket (11) is provided with a second sealing ring (14), and the second sealing ring (14) abuts against the outer side wall of the cylinder body (2).

6. The single-point needle valve hot runner according to claim 1, characterized in that: An outer wall at one end of the cylinder body (2) is provided with an extension portion (21) extending outward, and one end of the water transport jacket (11) abuts against the extension portion (21).

7. The single-point needle valve hot runner according to claim 1, characterized in that: A mounting position (83) is formed at one end of the second nozzle (8), a valve needle sleeve (15) is arranged in the mounting position (83), and the valve needle (10) passes through the valve needle sleeve (15).

8. The single-point needle valve hot runner according to claim 1, characterized in that: One end of the piston (4) is provided with a separation sleeve (41), and one end of the first nozzle (6) is located in the separation sleeve (41).

9. The single-point needle valve hot runner according to claim 8, characterized in that: The outer wall of the isolation sleeve (41) is sleeved with a third sealing ring (16), and the third sealing ring (16) abuts against the inner wall of the cylinder body (2).

10. The single-point needle valve hot runner according to claim 1, characterized in that: A side of the base (3) close to the cylinder cover (1) is provided with an annular sleeve (31), and one end of the second nozzle (8) is located in the annular sleeve (31).

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