A hollow cooling screw rod with a structure of a Tesla valve

Abstract

The present application relates to the technical field of cooling screw rod, in particular to a hollow cooling screw rod with Tesla valve structure, which comprises a cooling liquid inlet, an outer ring cooling liquid pipeline, a Tesla valve structure channel, a cooling liquid inlet and outlet exchange cavity, a cooling liquid return pipeline, a cooling liquid outlet, a screw rod body and a thread; the cooling liquid enters the outer ring cooling liquid pipeline through the cooling liquid inlet, and the flow speed of the cooling liquid is accelerated through the Tesla valve structure channel; the setting of multiple groups of Tesla valve structure channels increases the contact area between the cooling liquid and the screw rod body; the cooling liquid flows into the cooling liquid inlet and outlet exchange cavity after being accelerated by the Tesla valve structure channel, and then flows out through the cooling liquid outlet through the cooling liquid return pipeline; by increasing the contact area between the cooling liquid and the screw rod body and improving the flow speed of the cooling liquid, the screw rod body is cooled faster, the temperature difference between the inner and outer screw rod bodies is smaller, the overall thermal deformation is smaller, and the precision fed back to the machine tool is higher, so as to ensure the machining precision of the ultra-high precision machine tool.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cooling lead screws, in particular to a hollow cooling lead screw with Tesla valve structure. BACKGROUND

[0002] In mechanical processing, especially in numerical control machine tools, the numerical control system needs to convert the rotary motion of the motor into the linear motion of the machine tool through the control system. In this process, lead screws, worm gears, gear racks and other methods are generally used, but the lead screw is the most precise conversion method. During the conversion of rotary motion into linear motion of the machine tool, a large amount of heat is generated due to the sliding of the ball in the track. Because of the thermal expansion and contraction characteristics of the object, the lead screw will have a large thermal deformation, resulting in a large error in transmission accuracy, and the accuracy of the machine tool is difficult to control.

[0003] However, the current machine tool adopts the method of hollow lead screw water cooling to control the temperature of the lead screw to ensure the accuracy. However, due to the high temperature of the outside of the lead screw and the cooling liquid inside, the contact area between the inner surface of the lead screw and the cooling liquid is small, and the heat transfer amount is limited when high-speed processing. Therefore, it is difficult to control the temperature of the lead screw in real time. SUMMARY

[0004] In view of the problems in the prior art, the present application provides a hollow cooling lead screw with Tesla valve structure.

[0005] The technical scheme adopted by the present application to solve the technical problem is: a hollow cooling lead screw with Tesla valve structure, comprising a lead screw body; an outer ring cooling liquid pipeline is arranged on the lead screw body; a cooling liquid inlet and outlet exchange cavity is arranged in one end of the lead screw body; the outer ring cooling liquid pipeline is communicated with the cooling liquid inlet and outlet exchange cavity through eight through holes arranged in a circular array about the axis of the lead screw body; eight cooling liquid inlets are arranged in a circular array on the other end of the lead screw body, and the eight cooling liquid inlets are communicated with the outer ring cooling liquid pipeline; a cooling liquid return pipeline is arranged at the axis of the lead screw body and communicated with the cooling liquid inlet and outlet exchange cavity; a cooling liquid outlet is arranged at one end of the lead screw body away from the cooling liquid inlet and outlet exchange cavity, and the cooling liquid return pipeline is communicated with the outside through the cooling liquid outlet; a plurality of groups of Tesla valve structure ducts are arranged axially on the lead screw body; the inlet and outlet of the Tesla valve structure duct are communicated with the outer ring cooling liquid pipeline; and threads are arranged on the lead screw body.

[0006] Specifically, each group of the Tesla valve structure ducts is eight, and the eight Tesla valve structure ducts are arranged in a circular array about the axis of the lead screw body.

[0007] Specifically, one is arranged at the inlet of each Tesla valve structure channel, and two are arranged at the outlet of each Tesla valve structure channel.

[0008] Specifically, the screw body is formed by using 3D printing technology, the cross section of the two ends of the screw body is in a stepped shape, and the material of the screw body is titanium alloy metal.

[0009] Specifically, a plurality of groups of the Tesla valve structure channels are arranged at equal intervals, and the distance between the two adjacent groups of the Tesla valve structure channels is equal to the diameter of the outer ring cooling liquid pipeline.

[0010] The beneficial effects of the present application are as follows:

[0011] The hollow cooling screw with the Tesla valve structure of the present application is characterized in that: the cooling liquid enters the outer ring cooling liquid pipeline through the cooling liquid inlet, the flow speed of the cooling liquid is accelerated through the Tesla valve structure channel, the contact area between the cooling liquid and the screw body is increased through the arrangement of a plurality of groups of the Tesla valve structure channels, the cooling liquid flows into the cooling liquid inlet and outlet exchange cavity after being accelerated through the Tesla valve structure channel, and then flows out from the cooling liquid outlet through the cooling liquid return pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0012] The present application will be further described below in combination with the drawings and examples.

[0013] Figure 1 The present application provides a preferred embodiment of the overall structure of the hollow cooling screw with the Tesla valve structure.

[0014] Figure 2 The present application provides an axial sectional view of the screw body.

[0015] Figure 3 The present application provides a connection structure diagram of the cooling liquid inlet and outlet exchange cavity and the cooling liquid return pipeline.

[0016] Figure 4 The present application provides a radial sectional view of the screw body.

[0017] Figure 5 The present application provides a connection structure diagram of the cooling liquid inlet and the outer ring cooling liquid pipeline.

[0018] In the figure: 1, cooling liquid inlet; 2, outer ring cooling liquid pipeline; 3, Tesla valve structure channel; 4, cooling liquid inlet and outlet exchange cavity; 5, cooling liquid return pipeline; 6, cooling liquid outlet; 7, screw body; 8, thread. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the specific embodiments are combined below to further describe the present application.

[0020] As shown in Figures 1-5 The hollow cooling screw of the Tesla valve structure of the present application comprises a screw body 7, an outer ring cooling liquid pipeline 2 arranged on the screw body 7, a cooling liquid inlet and outlet exchange cavity 4 arranged inside one end of the screw body 7, eight through holes arranged in a circumferential array about the axis of the screw body 7 and communicating with the cooling liquid inlet and outlet exchange cavity 4, eight cooling liquid inlets 1 arranged in a circumferential array on the other end of the screw body 7 and communicating with the outer ring cooling liquid pipeline 2, a cooling liquid return pipeline 5 arranged at the axis of the screw body 7 and communicating with the cooling liquid inlet and outlet exchange cavity 4, a cooling liquid outlet 6 arranged at the end of the screw body 7 away from the cooling liquid inlet and outlet exchange cavity 4 and communicating with the outside through the cooling liquid return pipeline 5, and a plurality of groups of Tesla valve structure ducts 3 arranged axially on the screw body 7 and communicating with the outer ring cooling liquid pipeline 2 at the inlet and outlet. That is, the cooling liquid enters the outer ring cooling liquid pipeline 2 through the cooling liquid inlets 1, the flow speed of the cooling liquid is accelerated through the Tesla valve structure ducts 3, the contact area between the cooling liquid and the screw body 7 is increased by the arrangement of the plurality of groups of Tesla valve structure ducts 3, the cooling liquid flows into the cooling liquid inlet and outlet exchange cavity 4 after being accelerated by the Tesla valve structure ducts 3, and then flows out through the cooling liquid outlet 6 through the cooling liquid return pipeline 5. By increasing the contact area between the cooling liquid and the screw body 7 and improving the flow speed of the cooling liquid, the screw body 7 is cooled faster, the temperature difference between the inner and outer screw body 7 is smaller, the overall thermal deformation is smaller, and the precision fed back to the machine tool is higher, so as to ensure the machining precision of the ultra-high precision machine tool.

[0021] Specifically, as shown in Figure 4 Each group of the Tesla valve structure ducts 3 is eight, and the eight Tesla valve structure ducts 3 are arranged in a circumferential array about the axis of the screw body 7. The circumferential array of the eight Tesla valve structure ducts 3 on the screw body 7 increases the contact area between the cooling liquid and the screw body 7.

[0022] Specifically, each of the Tesla valve structure ducts 3 has one inlet and two outlets. The Tesla valve structure ducts 3 improve the flow speed of the cooling liquid in the outer ring cooling liquid pipeline 2 through special structural design.

[0023] Specifically, the screw rod body 7 is formed using a 3D printing technology, the cross section of the two ends of the screw rod body 7 is in a stepped shape, and the material of the screw rod body 7 is titanium alloy metal; the density of titanium alloy is smaller than that of alloy steel, and thus the rotational inertia is smaller, and a smaller motor can be selected under the same performance, or the original motor can be used to rotate at a faster speed.

[0024] Specifically, as shown in Figure 2 and Figure 3 , a plurality of groups of the Tesla valve structure ducts 3 are arranged at equal intervals, the distance between the two adjacent groups of the Tesla valve structure ducts 3 is equal to the diameter of the outer ring cooling liquid pipeline 2; as shown in Figure 3 , the diameter of the cooling liquid return pipeline 5 is r, the intermediate wall thickness of the cooling liquid return pipeline 5 and the outer ring cooling liquid pipeline 2 is b, the radius of the outer ring cooling liquid pipeline 2 is R, and the radius of the Tesla valve structure duct 3 is r1; in order to ensure the smooth circulation of the cooling medium inside the screw rod body 7, the following formula should be satisfied:

[0025] πr 2 =πR 2 -π(R+b) 2

[0026] It is concluded that

[0027] r1=(R-r-b)ε ε takes 0.6-0.8

[0028] The axial spacing of the Tesla valve structure duct 3 is 2R; the flow rate of the cooling medium inside the screw rod body 7 and the contact area with the screw rod body 7 are increased, and the temperature of the screw rod body 7 is more constant during operation.

[0029] In use, the cooling liquid enters the outer ring cooling liquid pipeline 2 on the screw rod body 7 through the cooling liquid inlet 1, the cooling liquid inside the outer ring cooling liquid pipeline 2 is accelerated to flow through the Tesla valve structure duct 3, the arrangement of a plurality of groups of the Tesla valve structure duct 3 increases the contact area of the cooling liquid with the screw rod body 7, the cooling liquid flows into the cooling liquid inlet and outlet exchange cavity 4 after being accelerated by the Tesla valve structure duct 3, and then flows out through the cooling liquid outlet 6 through the cooling liquid return pipeline 5; the circumferential array of eight Tesla valve structure ducts 3 on the screw rod body 7 increases the contact area between the cooling liquid and the screw rod body 7, the Tesla valve structure duct 3 improves the flow rate of the cooling liquid in the outer ring cooling liquid pipeline 2 through special structural design, the contact area of the cooling liquid with the screw rod body 7 is increased and the flow rate of the cooling liquid is improved, so that the screw rod body 7 is cooled faster, the temperature difference between the inside and outside of the screw rod body 7 is smaller, the overall thermal deformation is smaller, and the precision fed back to the machine tool is higher, so as to ensure the machining precision of the ultra-high precision machine tool; the material of the screw rod body 7 is titanium alloy metal, the density of titanium alloy is smaller than that of alloy steel, and thus the rotational inertia is smaller, a smaller motor can be selected under the same performance, or the original motor can be used to rotate at a faster speed.

[0030] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. The presently disclosed embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference to an item in the claims to be construed as a disavowal of the item, even if the item is not recited in each claim.

[0031] Furthermore, it should be understood that although the description is made on embodiments, not every embodiment contains only one independent technical solution, and the description is made in this way only for the sake of clarity, and those skilled in the art should consider the description as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A Tesla valve-structured hollow cooling screw, characterized in that, include: The lead screw body (7) is provided with an outer ring coolant pipe (2). One end of the lead screw body (7) has a coolant inlet / outlet exchange chamber (4). The outer ring coolant pipe (2) is connected to the coolant inlet / outlet exchange chamber (4) through eight through holes arranged in a circumferential array around the axis of the lead screw body (7). The other end of the lead screw body (7) has eight coolant inlets (1) arranged in a circumferential array. All eight coolant inlets (1) are connected to the outer ring coolant pipe (2). A coolant return pipe (5) is provided at the axis of the lead screw body (7). The coolant inlet / outlet exchange chamber (4) is connected to the coolant return pipe (5). A coolant outlet (6) is provided at one end away from the coolant inlet / outlet exchange chamber (4). The coolant return pipe (5) is connected to the outside through the coolant outlet (6). Multiple Tesla valve structure ducts (3) are axially provided on the screw body (7). The inlet and outlet of the Tesla valve structure duct (3) are connected to the outer ring coolant pipe (2). The screw body (7) is provided with threads (8). Each set of Tesla valve structure ducts (3) has eight sections, and the eight Tesla valve structure ducts (3) are arranged in a circular array about the axis of the screw body (7). Each Tesla valve structure duct (3) has one inlet and two outlets. The coolant enters the outer ring coolant pipeline (2) through the coolant inlet (1), and the flow rate of the coolant is accelerated by the Tesla valve structure channel (3). The setting of multiple Tesla valve structure channels (3) increases the contact area between the coolant and the lead screw body (7). After being accelerated by the Tesla valve structure channel (3), the coolant flows into the coolant inlet and outlet exchange chamber (4), and then flows out through the coolant return pipeline (5) and the coolant outlet (6). By increasing the contact area between the coolant and the lead screw body (7) and increasing the coolant flow rate, the lead screw body (7) is cooled faster, the temperature difference between the inner and outer lead screw bodies (7) is smaller, the overall thermal deformation is smaller, and the accuracy fed back to the machine tool is higher, so as to ensure the machining accuracy of the ultra-high precision machine tool. The lead screw body (7) is provided with eight Tesla valve structure channels (3) in a circumferential array to increase the contact area between the coolant and the lead screw body (7). The Tesla valve structure channel (3) improves the flow rate of the coolant in the outer ring coolant pipeline (2) through a special structural design.

2. The Tesla valve-structured hollow cooling screw according to claim 1, characterized in that: The lead screw body (7) is formed using 3D printing technology. The cross-sections at both ends of the lead screw body (7) are stepped. The material of the lead screw body (7) is titanium alloy metal.

3. The Tesla valve-structured hollow cooling screw according to claim 1, characterized in that: Multiple sets of Tesla valve structure ducts (3) are equidistantly arranged, and the distance between two adjacent sets of Tesla valve structure ducts (3) is equal to the diameter of the outer ring coolant pipe (2).

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