Double-layer water jacket structure of hot runner

Abstract

The utility model is applicable to the technical field of hot runners, and provides a double-layer water jacket structure of a hot runner, which comprises an outer layer jacket and an inner layer jacket, the inner layer jacket is nested in the outer layer jacket, the outer diameter of the rear section of the inner layer jacket is reduced, and an annular cavity is formed between the rear section of the inner layer jacket and the inner wall of the outer layer jacket. According to the hot runner double-layer water jacket structure, the water jacket is arranged to be of an inner-layer and outer-layer structure, a certain heat preservation effect is achieved, an annular cavity is formed between the rear end of the outer-layer jacket and the rear end of the inner-layer jacket, heat conduction can be blocked, heat can only be conducted between the front sections of the inner-layer jacket and the outer-layer jacket, and the outer-layer jacket makes contact with cooling liquid for heat dissipation and cooling; therefore, not only can the cooling effect be realized, but also the influence on subsequent processing caused by too low temperature due to too much heat loss can be avoided. A good cooling effect is achieved on the mold core, heat of the hot runner cannot be excessively lost, and the contradiction between heat preservation of the hot runner and cooling of the mold core is effectively solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of hot runner, and particularly relates to a double-layer water jacket structure of a hot runner. Background Technique

[0002] A hot runner is a heating component system used in an injection mold to inject molten plastic particles into the cavity of the mold. The hot runner ensures that the plastic in the runner and the gate remains in a molten state by heating. In an inverted hot runner mold, the hot runner is located at the ejector plate position (moving mold). When the mold is mounted, the moving mold is at the fixed plate position of the injection molding machine, and the ejection mechanism usually adopts hydraulic ejection.

[0003] Such as Figure 1 As shown, the existing water conveying jacket used in the hot runner is a single-layer structure. The coolant contacts the water conveying jacket to take away the heat of the mold core. During injection molding, if the temperature is too high, dark spots and bright areas (sun spots) are likely to occur, while if the temperature is too low, the injection needle cannot reach the bottom. When cooling the mold, a single-layer water conveying jacket is used for cooling. Due to the simple heat transfer of the single-layer structure and poor heat preservation effect, the heat loss of the hot runner is too large, which easily causes the temperature of the mold core to drop too much, is not conducive to subsequent processing, and the cooling effect is not good. Content of the Utility Model

[0004] The utility model provides a double-layer water jacket structure of a hot runner, aiming to solve the problem that using a single-layer conveying sleeve causes too much heat loss of the hot runner, easily leads to excessive temperature reduction of the mold core, and is not conducive to subsequent processing.

[0005] The utility model is realized as follows. A double-layer water jacket structure of a hot runner includes an outer jacket and an inner jacket. The inner jacket is nested inside the outer jacket. The outer diameter of the rear section of the inner jacket decreases, forming an annular cavity between the inner wall of the outer jacket.

[0006] Preferably, the outer diameter of the middle and rear sections of the inner jacket becomes larger, forming an annular cavity between the inner wall of the outer jacket.

[0007] Preferably, the inner diameter of the middle and rear sections of the outer jacket becomes smaller, forming an annular cavity between the outer surface of the inner jacket.

[0008] Beneficial Effects

[0009] Compared with the prior art, the beneficial effects of the present utility model are as follows: A double-layer water jacket structure of a hot runner in the present utility model sets the water jacket as an inner and outer layer structure, which has a certain heat preservation effect. And an annular cavity is formed between the rear ends of the outer layer sleeve and the inner layer sleeve, which can block the conduction of heat, so that heat can only be conducted between the front sections of the inner layer sleeve and the outer layer sleeve. The outer layer sleeve contacts the coolant for heat dissipation and temperature reduction. Excessive heat loss will not occur, and the temperature can be maintained within a suitable range. It can not only achieve the effect of cooling, but also will not reduce the temperature too much, nor will it cause excessive heat loss resulting in too low a temperature, which affects subsequent processing. It not only has a good cooling effect on the mold core, but also will not cause excessive heat loss of the hot runner, effectively resolving the contradiction between the heat preservation of the hot runner and the cooling of the mold core, facilitating debugging, taking both into account, and the debugging effect is obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a sectional view of the prior art;

[0011] Figure 2 is a schematic sectional view of the structure in the present utility model.

[0012] In the figure: 1 - outer layer sleeve, 2 - inner layer sleeve, 3 - inner layer sleeve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0013] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0014] Please refer to Figure 2 , the present utility model provides a technical solution: A double-layer water jacket structure of a hot runner, including an outer layer sleeve 1 and an inner layer sleeve 2, the inner layer sleeve 2 is nested inside the outer layer sleeve 1, and the outer diameter of the rear section of the inner layer sleeve 2 is reduced, forming an annular cavity 3 between it and the inner wall of the outer layer sleeve 1.

[0015] Both the rear ends of the outer layer sleeve 1 and the inner layer sleeve 2 are closed.

[0016] The annular cavity 3 can be formed by the inner circumferential surface of the inner layer sleeve 2 being recessed inward to make the wall thickness thinner, or the inner wall surface of the outer layer sleeve 1 can expand outward towards the outer wall surface, with the wall thickness becoming thinner, to form this cavity.

[0017] The water jacket is set as an inner and outer layer structure, which has a certain heat preservation effect. The coolant contacts the outer jacket 1 and takes away the heat, without causing excessive heat loss and resulting in too low a temperature to affect subsequent processing. Moreover, an annular cavity 3 is formed between the rear sections of the outer jacket 1 and the inner jacket 2, which can block the conduction of heat, so that the heat can only be conducted between the front sections of the inner jacket 2 and the outer jacket 1. The outer jacket 1 contacts the coolant for heat dissipation and temperature reduction, and the heat will not be lost too much, so that the temperature is within a suitable range, which can not only achieve the cooling effect but also not reduce the temperature too much. It can not only achieve a good cooling effect on the mold core but also not cause excessive heat loss of the hot runner, effectively resolving the contradiction between the hot runner heat preservation and the mold core cooling, facilitating debugging, taking both into account, and having an obvious debugging effect.

[0018] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A double-layer water jacket structure for a hot runner, characterized in that: It includes an outer sleeve (1) and an inner sleeve (2). The inner sleeve (2) is nested inside the outer sleeve (1), and an annular cavity (3) is formed between the middle and rear section of the inner sleeve (2) and the inner wall of the outer sleeve (1); the outer diameter of the middle and rear section of the inner sleeve (2) becomes smaller, and an annular cavity (3) is formed between it and the inner wall of the outer sleeve (1).

2. The double-layer water jacket structure of a hot runner according to claim 1, wherein: The inner diameter of the middle and rear section of the outer sleeve (1) becomes larger, and an annular cavity (3) is formed between it and the outer surface of the inner sleeve (2).

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