Tubular heater and hot runner assembly

Abstract

The utility model provides a tubular heater and a hot runner assembly, the tubular heater comprises a tubular heat conduction piece, the outer wall of the tubular heat conduction piece is provided with a heating groove and a temperature sensing groove intersecting with the heating groove, and the depth of the heating groove is larger than that of the temperature sensing groove; the heating wire is arranged in the heating groove; and the temperature sensing wire is arranged in the temperature sensing groove, and the heating wire is closer to the central axis of the tubular heat conduction piece than the temperature sensing wire. According to the tubular heater, the heating groove and the temperature sensing groove intersect, and the heating groove is deep, so that the heating wire and the temperature sensing wire can be arranged in the grooves, and the temperature sensing wire is prevented from being located on the surface of the tubular heat conduction piece to cause collision damage.

Description

Technical Field

[0001] The present application relates to the field of hot runner technology, and in particular to a tubular heater and a hot runner assembly. Background Art

[0002] In existing technology, the heater used to heat the nozzle is tubular, typically a copper tube. A heating groove is machined into the copper tube to accommodate the heating wire. Once installed, the heating wire is flush with the copper tube surface, while the TC temperature control wire can only be placed outside the copper tube, keeping it in close contact with the outer surface. This results in the actual opening for the heater to be installed being larger than the diameter of the copper tube plus the diameter of the TC temperature control wire. Furthermore, the TC temperature control wire is exposed, making it prone to damage and bruises due to unstable fixing. Summary of the Invention

[0003] The purpose of the present application is to provide a tubular heater and a hot runner assembly. In the tubular heater, a heating groove and a temperature sensing groove are opened on the outer surface of the tubular heat conductor to place the heating wire and the temperature sensing wire respectively, and the depth of the heating groove is set to be larger, which solves the problem in the prior art that the temperature sensing wire is exposed to the outside and is prone to bruises and damage.

[0004] In order to achieve one of the above-mentioned objectives of the invention, one embodiment of the present application provides a tubular heater and a hot runner assembly, comprising:

[0005] The tubular heat conducting member has an outer wall provided with a heating groove and a temperature sensing groove intersecting the heating groove, wherein the depth of the heating groove is greater than the depth of the temperature sensing groove;

[0006] A heating wire is arranged in the heating tank;

[0007] The temperature sensing wire is arranged in the temperature sensing tank, and the heating wire is closer to the central axis of the tubular heat conducting member than the temperature sensing wire.

[0008] As a further improvement of an embodiment of the present application, the depth of the heating groove is not less than the sum of the diameters of the heating wire and the temperature sensing wire.

[0009] As a further improvement of an embodiment of the present application, the depth of the temperature sensing tank is not less than the diameter of the temperature sensing wire.

[0010] As a further improvement of an embodiment of the present application, the heating groove extends in a spiral shape from one end to the other end along the outer circumference of the tubular heat conducting member.

[0011] As a further improvement of an embodiment of the present application, the density of the heating grooves is such that the ends of the tubular heat conducting member are larger than the middle portion of the tubular heat conducting member.

[0012] As a further improvement of an embodiment of the present application, the temperature sensing tank includes an extension section extending from one end to the other end of the tubular heat conductor and a temperature measuring section connected to the extension section and bent.

[0013] As a further improvement of an embodiment of the present application, one end of the extension section away from the temperature measuring section passes through the end surface of the tubular heat conducting member.

[0014] As a further improvement of an embodiment of the present application, the temperature measuring section of the temperature sensing tank is located at the end where the heating tanks are most densely populated.

[0015] One embodiment of the present application further provides a hot runner assembly, comprising a hot nozzle and a tubular heater sleeved on the hot nozzle, wherein the tubular heater is the tubular heater as described above.

[0016] As a further improvement of an embodiment of the present application, the hot nozzle includes a hot nozzle body and a nozzle tip, and of the two ends where the heating slots are more densely packed, the denser end is arranged close to the nozzle tip.

[0017] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0018] In the tubular heater provided in the present application, intersecting heating grooves and temperature-sensing grooves are provided on the outer surface of the tubular heat-conducting member, a heating wire is provided in the heating groove, and a temperature-sensing wire is provided in the temperature-sensing groove. The depth of the heating groove is greater than the depth of the temperature-sensing groove, and the heating wire is closer to the center line of the tubular heat-conducting member, so that both the heating wire and the temperature-sensing wire can be embedded in the tubular heat-conducting member. The opening frame for installing the tubular heater can be reduced and the temperature control wire is fixed in position to avoid damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of the tubular heater in the embodiment of the present application.

[0020] Figure 2 yes Figure 1 Schematic diagram of the structure of the tubular heat conductor.

[0021] Figure 3 This is a front view of the coordination of the hot nozzle and the tubular heater in the hot runner assembly in the embodiment of the present application.

[0022] Figure 4 yes Figure 3 Schematic cross-sectional view along line AA.

[0023] 10. Tubular heater; 20. Hot nozzle;

[0024] 1. Tubular heat-conducting element; 11. Heating tank; 12. Temperature-sensing tank; 121. Extension section; 122. Temperature-measuring section; 2. Heating wire; 3. Temperature-sensing wire; 4. Hot nozzle body; 5. Nozzle tip. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0026] As used herein, terms such as "center," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" that indicate spatial relative positions are used for ease of explanation to describe the relationship of one element or feature relative to another element or feature as shown in the accompanying drawings. Spatially relative terms may be intended to encompass different orientations of the device in use or operation other than the orientation shown in the drawings.

[0027] For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0029] The present application provides a tubular heater 10 for heating a hot nozzle 20 in a hot runner assembly. The hot runner assembly includes the hot nozzle 20 and the tubular heater 10, which is mounted on the hot nozzle 20 and heats the hot nozzle 20. Furthermore, the hot runner assembly may further include a manifold connected to the hot nozzle 20 and a template (not shown) having an open frame. The tubular heater 10 is mounted on the hot nozzle 20 and then disposed within the open frame. Thus, the present application also provides a hot runner assembly including the aforementioned tubular heater 10.

[0030] like Figure 1As shown, the aforementioned tubular heater 10 includes a tubular heat-conducting member 1, a heating wire 2 and a temperature-sensitive wire 3. The outer wall of the tubular heat-conducting member 1 is provided with a heating groove 11 and a temperature-sensitive groove 12 intersecting with the heating groove 11. The depth of the heating groove 11 is greater than the depth of the temperature-sensitive groove 12. The heating wire 2 is arranged in the heating groove 11. The temperature-sensitive wire 3 is arranged in the temperature-sensitive groove 12. The heating wire 2 is closer to the central axis of the tubular heat-conducting member 1 than the temperature-sensitive wire 3.

[0031] In the tubular heater 10 provided in the present application, the heating groove 11 and the temperature-sensing groove 12 opened on the outer wall of the tubular heat-conducting member 1 are used to accommodate the heating wire 2 and the temperature-sensing wire 3, respectively. Since the heating groove 11 and the temperature-sensing groove 12 intersect, the heating wire 2 and the temperature-sensing wire 3 will overlap in the radial direction of the tubular heat-conducting member 1. Therefore, the depth of the heating groove 11 is set to be greater than the depth of the temperature-sensing wire 3. The heating wire 2 is first placed in the heating groove 11, and the tubular heat-conducting member 1 is used for heat conduction, so that the heating wire 2 can heat the heated member to be sleeved by the tubular heater 10; then the temperature-sensing wire 3 is placed in the temperature-sensing groove 12, so that the temperature-sensing wire 3 can be constrained by the temperature-sensing groove 12, thereby preventing the temperature-sensing wire 3 from being bruised or damaged due to loose fixation.

[0032] In some embodiments, the depth of the heating groove 11 is not less than the sum of the diameters of the heating wire 2 and the temperature-sensing wire 3, so that at the intersection of the heating wire 2 and the temperature-sensing wire 3, after the heating wire 2 and the temperature-sensing wire 3 are superimposed, the temperature-sensing wire 3 will not protrude from the outer surface of the tubular heat conductor 1.

[0033] In some embodiments, the depth of the temperature-sensing tank 12 is no less than the diameter of the temperature-sensing wire 3. This allows the temperature-sensing wire 3 to be completely contained within the temperature-sensing tank 12 and not protrude from the outer surface of the tubular heat-conducting member 1, preventing the temperature-sensing wire 3 from being impacted and worn. Furthermore, as the temperature-sensing wire 3 transitions from protruding from the outer surface of the tubular heat-conducting member 1 to being embedded within the tubular heat-conducting member 1, the mold opening can be correspondingly reduced, thereby increasing the overall strength of the mold. Preferably, the depth of the heating tank 11 is equal to the sum of the diameters of the heating wire 2 and the temperature-sensing wire 3, and the depth of the temperature-sensing tank 12 is equal to the diameter of the temperature-sensing wire 3.

[0034] In some embodiments, the heating groove 11 extends spirally from one end to the other along the outer circumference of the tubular heat-conducting member 1. The heating groove 11 is arranged to extend spirally along the tubular heat-conducting member 1, so that the heating wire 2 disposed in the heating groove 11 can surround the tubular heat-conducting member 1, and can uniformly heat or locally heat the exterior of the heated member enclosed in the tubular heater 10 as needed.

[0035] In some embodiments, the density of the heating slots 11 is such that the ends of the tubular heat-conducting member 1 are greater than the middle portion thereof, thereby heating a heated member having a higher temperature at the ends and a lower temperature in the middle. Of course, the density of the heating slots 11 can also be set such that the middle portion is greater than the ends, or the heating wires 2 are evenly distributed, or the density is gradually varied, to accommodate heated members with different heating requirements.

[0036] In some embodiments, the temperature sensing tank 12 includes an extension section 121 extending from one end of the tubular heat conductive member 1 to the other end, and a curved temperature measuring section 122 connected to the extension section. The extension section 121 of the temperature sensing tank 12 extends from one end to the other along the length of the tubular heat conductive member 1, thereby minimizing the length of the temperature sensing cable 3. The curved configuration of the temperature measuring section 122 further secures the temperature sensing cable 3 within the temperature sensing tank 12. The end of the temperature sensing cable 3 is disposed within the temperature measuring section 122 to measure the temperature at the end of the tubular heat conductive member 1.

[0037] In some embodiments, the end of the extension section 121, distal from the temperature measuring section 122, penetrates the end face of the tubular heat conductive member 1. The temperature measuring point of the temperature sensing wire 3 is located at its end, which is disposed within the temperature measuring section 122. The other end of the temperature sensing wire 3 requires electrical connection. The end of the extension section 121, distal from the temperature measuring section 122, penetrates the end face of the tubular heat conductive member 1 to allow the temperature sensing wire 3 to pass through the tubular heat conductive member 1 and connect to electrical power.

[0038] In some embodiments, the temperature measuring section 122 of the temperature sensing tank 12 is located at the densely populated end of the heating tank 11. A denser area indicates a higher required temperature, and is usually the primary heating area for the heated component. Therefore, the temperature measuring point of the temperature sensing line 3 is set in this area for temperature measurement.

[0039] In some embodiments, as shown in the figure, the hot nozzle 20 includes a hot nozzle body 4 and a nozzle tip 5. Of the two ends with a higher density of heating grooves 11, the more densely packed end is located closer to the nozzle tip 5. The nozzle tip 5 is the discharge end of the fluid. Due to its special structure, the thermal conductivity of the nozzle tip 5 is generally worse than that of the hot nozzle body 4. Therefore, additional heating is required on the outside of the nozzle tip 5 to compensate for the heat.

[0040] It should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation method can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0041] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of this application. They are not intended to limit the scope of protection of this application. Any equivalent implementation methods or changes that do not deviate from the technical spirit of this application should be included in the scope of protection of this application.

Claims

1. A tubular heater, characterized in that: include: The tubular heat conducting member has an outer wall provided with a heating groove and a temperature sensing groove intersecting the heating groove, wherein the depth of the heating groove is greater than the depth of the temperature sensing groove; A heating wire is arranged in the heating tank; The temperature sensing wire is arranged in the temperature sensing tank, and the heating wire is closer to the central axis of the tubular heat conducting member than the temperature sensing wire.

2. The tubular heater according to claim 1, wherein The depth of the heating tank is not less than the sum of the diameters of the heating wire and the temperature sensing wire.

3. The tubular heater according to claim 2, characterized in that The depth of the temperature sensing tank is not less than the diameter of the temperature sensing wire.

4. The tubular heater according to claim 1, wherein The heating groove extends spirally from one end to the other end along the outer circumference of the tubular heat conducting member.

5. The tubular heater according to claim 4, characterized in that The density of the heating grooves is such that the ends of the tubular heat conducting member are larger than the middle portion of the tubular heat conducting member.

6. The tubular heater according to claim 5, characterized in that The temperature sensing tank comprises an extension section extending from one end of the tubular heat conducting member to the other end and a temperature measuring section connected to the extension section and bent.

7. The tubular heater according to claim 6, characterized in that One end of the extension section away from the temperature measuring section passes through the end surface of the tubular heat conducting member.

8. The tubular heater according to claim 6, wherein: The temperature measuring section of the temperature sensing tank is located at the end where the heating tanks are most densely packed.

9. A hot runner assembly, characterized in that: The invention comprises a hot nozzle and a tubular heater sleeved on the hot nozzle, wherein the tubular heater is the tubular heater according to any one of claims 5 to 8.

10. The hot runner assembly according to claim 9, wherein: The hot nozzle includes a hot nozzle body and a nozzle tip. Of the two ends where the heating grooves are more densely packed, the denser end is arranged close to the nozzle tip.

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