A turntable with built-in evaporator

Abstract

The present invention discloses a turntable with a built-in evaporator, comprising a table body, a box body, a rotating frame fixed to the box body, and an evaporator arranged inside the box body, wherein the rotating frame is rotatably connected to the table body through a main shaft; the evaporator is fixedly connected to the table body through a connecting shaft, and the connecting shaft is arranged to penetrate along the axial direction of the main shaft; the connecting shaft is rotatably connected to the main shaft through a first bearing assembly, and the connecting shaft is rotatably connected to the rotating frame through a second bearing assembly; the first bearing assembly includes a first bearing, and the second bearing frame assembly includes a second bearing. The present invention can stabilize the refrigeration effect of the turntable.

Description

Technical Field

[0001] The invention relates to the field of dual-axis temperature-controlled turntable equipment, and in particular to a turntable with a built-in evaporator. Background Art

[0002] Turntables are widely used in the fields of aviation, aerospace and navigation, mainly to provide precise positioning and rate reference for inertial navigation systems, gyroscopes, etc., and to conduct dynamic and static tests and calibrations, as well as simulation tests. With the rapid development of the country's aviation, aerospace and navigation fields, inertial components, inertial navigation systems, gyroscopes, etc. are inseparable from various tests and simulations, and the demand for turntables is increasing year by year.

[0003] Temperature-controlled turntables are common products in the turntable field, and are mainly used to perform calibration tests on the test pieces. The heating of the turntable is achieved by electric heating, and the cooling is mainly liquid nitrogen cooling and compressor cooling.

[0004] However, the two-axis rotary compressor uses a rotary joint to cool the refrigeration pipe. Although the use of a rotary joint is very convenient, there are many hidden dangers. As the service life increases, the reliability of the rotary joint decreases, which can easily cause gas and refrigerant leakage, which not only greatly weakens the refrigeration effect, but also has a certain impact on the human body. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a turntable with a built-in evaporator, which can stabilize the refrigeration effect of the turntable.

[0006] In order to solve the above technical problems, the present invention provides a turntable with a built-in evaporator, comprising a table body, a box body, a rotating frame fixed to the box body, and an evaporator arranged inside the box body, the rotating frame being rotatably connected to the table body through a main shaft; the evaporator is fixedly connected to the table body through a connecting shaft, and the connecting shaft is arranged along the axial direction of the main shaft; the connecting shaft is rotatably connected to the main shaft through a first bearing assembly, and the connecting shaft is rotatably connected to the rotating frame through a second bearing assembly; the first bearing assembly includes a first bearing, and the second bearing frame assembly includes a second bearing.

[0007] Furthermore, the first bearing assembly also includes a bearing seat, and the bearing seat is connected to the main shaft.

[0008] Furthermore, the outer ring of the first bearing is fixed to the bearing seat, and the inner ring of the first bearing is clearance-fitted with the connecting shaft.

[0009] Furthermore, the rotating frame is symmetrically provided with leveling components to adjust the torque of the rotating frame.

[0010] Furthermore, the leveling assembly includes a base and a plurality of leveling plates sleeved on the base, wherein the leveling plates can move in a vertical direction and can be fixedly connected to the base via fasteners.

[0011] Furthermore, the connecting shaft is fixed to the platform body through a limiting assembly, and the limiting assembly includes a limiting claw and a plurality of protrusions engaged therewith, the limiting claw is arranged in the platform body, and all the protrusions are arranged at the end of the connecting shaft and can cooperate with the limiting claw to limit the rotation of the connecting shaft.

[0012] Furthermore, the limiting assembly is located at the outer end of the first bearing assembly.

[0013] Furthermore, the connecting shaft is provided with a connecting groove along its axial direction.

[0014] Beneficial effects of the present invention:

[0015] The evaporator is built inside the box, and the low-temperature condensed liquid passes through the evaporator and exchanges heat with the outside air, and the refrigeration effect is achieved by absorbing heat through vaporization. At the same time, the evaporator set inside the box avoids gas leakage, thereby improving the reliability of the turntable when in use;

[0016] The dual-axis temperature-controlled turntable has a high angular velocity and angular vibration. In order to enable the evaporator built into the box to work stably, a secondary hyperstatic beam is formed by using a first bearing assembly rotatably connected to the main shaft and a second bearing assembly rotatably connected to the rotating frame, thereby improving the natural frequency and stiffness of the turntable with the built-in evaporator, reducing the maximum bending moment in the connecting shaft, thereby improving the strength of the connecting shaft and improving the reliability of the evaporator setting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an overall schematic diagram of the present invention;

[0018] Figure 2 yes Figure 1 A magnified view of part A;

[0019] Figure 3 is an overall schematic diagram of the first bearing assembly;

[0020] Figure 4 It is the overall schematic diagram of the limit assembly;

[0021] Figure 5 is a cross-sectional view of the leveling assembly.

[0022] Explanation of the numbers in the figure: 1. table body; 11. limiting cam; 2. box body; 21. rotating frame; 22. main shaft; 3. evaporator; 4. connecting shaft; 41. connecting groove; 42. protrusion; 51. first bearing; 52. bearing seat; 6. second bearing; 7. leveling assembly; 71. base; 72. leveling plate; 721. fastener; 73. connecting seat. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0024] Reference Figure 1 As shown, an embodiment of a turntable with a built-in evaporator of the present invention includes a table body 1, a box body 2 and a rotating frame 21. The box body 2 and the rotating frame 21 can both generate a rotational motion in a horizontal direction relative to the table body 1. Because the box body 2 and the rotating frame 21 are fixedly connected, synchronous motion can be achieved.

[0025] Reference Figure 1 The evaporator 3 is built inside the box 2. The evaporator 3 is a very important part of the four major parts of the refrigeration. It uses the heat exchange between the low-temperature condensed liquid flowing through the evaporator 3 and the outside air, and uses the gasification of the condensed liquid to absorb heat to achieve the refrigeration effect. The evaporator 3 arranged inside the box 2 is not connected to the box 2. The evaporator 3 is fixedly connected to the platform 1 through the connecting shaft 4. In this embodiment, in order to facilitate the installation and replacement of the connecting shaft 4, the connecting shaft 4 is fixed to the evaporator 3 by a number of fastening screws.

[0026] Preferably, refer to Figure 2 and Figure 3 The connecting shaft 4 is fixedly connected to the table body 1 through a limiting assembly, and the limiting assembly includes a limiting claw 11 and a plurality of protrusions 42 that cooperate with the limiting claw 11. All the protrusions 42 are fixed on the free end surface of the connecting shaft 4, and the protrusions 42 are evenly arrayed along the circumference of the connecting shaft 4. In this embodiment, in order to facilitate the processing of the connecting shaft 4, the protrusions 42 and the connecting shaft 4 are integrally formed. When the protrusions 42 and the limiting claws 11 are matched, all the protrusions 42 can be correspondingly embedded in the claw grooves of the limiting claws 11, so that the rotation of the connecting shaft 4 relative to the table body 1 can be reduced by using the cooperation of the limiting claws 11 and the protrusions 42, so as to increase the reliability of the height of the evaporator 3.

[0027] Reference Figure 1 and Figure 2, the rotating frame 21 rotates relative to the table body 1 through the main shaft 22, and one end of the main shaft 22 is fixedly connected to the rotating frame 21 by a fastening bolt. The other end of the main shaft 22 extends to the inside of the table body 1 and can rotate relative to the table body 1. The connecting shaft 4 is arranged along the axial direction of the main shaft 22, and the axis of the connecting shaft 4 and the axis of the main shaft 22 are colinear. In order to reduce the influence of the main shaft 22 on the connecting shaft 4 passing through it when rotating, a first bearing 51 assembly is arranged between the main shaft 22 and the connecting shaft 4, and the first bearing 51 assembly includes a first bearing 51. Because the evaporator 3 is arranged inside the housing 2, the connecting shaft 4 fixed to the evaporator 3 passes through the housing 2, the rotating frame 21 and the main shaft 22 in turn, and extends into the table body 1. When the main shaft 22 drives the housing 2 and the rotating frame 21 to move, in order to reduce the influence on the connecting shaft 4 and the evaporator 3, the connecting shaft 4 is rotatably connected to the rotating frame 21 through the second bearing 6 assembly, and the second bearing 6 assembly includes a second bearing 6.

[0028] Reference Figure 2 , the connecting shaft 4 is subjected to both static load and dynamic load during the rotation of the turntable. The static load is the self-weight of the evaporator 3 and the connecting shaft 4, which brings certain bending stress to the connecting shaft 4. In addition, the rotating frame 21 and the box body 2 are a large irregular rotating body. Due to the irregular shape and different materials, the mass of each point of the entire component is different, so the center of mass cannot fall on the rotation axis. Under the high-speed rotation of the rotating frame 21, a periodic interference force is generated, causing the connecting shaft 4 to be forced to vibrate. It can be seen from the centripetal force that the greater the angular velocity, the greater the interference force. In addition, based on the angular vibration function, the stiffness and natural frequency of the connecting shaft 4 are required to be relatively high. Therefore, the high speed and angular vibration function of the dual-axis multifunctional turntable have higher requirements for the fixation of the evaporator 3. The first bearing 51 arranged between the main shaft 22 and the connecting shaft 4, and the second bearing 6 arranged between the connecting shaft 4 and the rotating frame 21, in addition to reducing the rotation of the connecting shaft 4 and the evaporator 3 as mentioned above to increase the stability and reliability of the fixation of the evaporator 3, can also increase the strength of the connecting shaft 4 and increase the strength of the fixation of the evaporator 3 by increasing the natural frequency and stiffness of the connecting shaft 4.

[0029] Reference Figure 1 and Figure 2As can be seen from the above, one end of the connecting shaft 4 is fixedly connected to the evaporator 3, and the other end is connected to the table body through a limiting claw. The end fixed to the table body can be regarded as a fixed end, and the connecting shaft 4 can be further regarded as a cantilever beam structure; the connecting shaft 4 is respectively connected to the main shaft 22 through the first bearing 51, and the second bearing 6 is connected to the rotating frame 21, so the position where the first bearing 51 is set can be used as the first movable hinge support, and the position where the second bearing 6 is set can be used as the second movable hinge support. That is, the entire system is equivalent to adding two movable hinge supports to one end of the cantilever beam, so the entire connecting shaft 4 is equivalent to a secondary indeterminate beam. Similarly, if the constraint of the movable hinge support on the secondary indeterminate beam is to be released, the constraint force of the corresponding movable hinge support must be used instead, so that the force on the connecting shaft 4 becomes a cantilever beam under the joint action of the original load, the constraint force of the first movable hinge support and the constraint force of the second movable hinge support. According to the force analysis, the provision of the first movable hinge support and the second movable hinge support further improves the natural frequency and stiffness of the structure, reduces the maximum bending moment in the connecting shaft 4, improves the strength of the connecting shaft 4, and thus improves the reliability of fixing the evaporator 3.

[0030] Reference Figure 2 and Figure 3 The first bearing 51 assembly also includes a bearing seat 52, which is fixedly connected to the free end surface of the main shaft 22 by a plurality of fastening screws, so that the overall structure of the first bearing 51 assembly is compact and the installation of the first bearing 51 assembly is also convenient. In addition, the bearing seat 52 fixedly arranged at the end of the main shaft 22 can be used as a load-relief device, and the connecting shaft 4 is directly fixedly connected to the main shaft 22 through the bearing seat 52, thereby transmitting stress and interference force to the main shaft 22 with higher rigidity, reducing the influence on the connecting shaft 4 and the evaporator 3.

[0031] Reference Figure 3 The first bearing 51 is arranged between the connecting shaft 4 and the main shaft 22 through the bearing seat 52. The outer ring of the first bearing 51 is interference fit with the bearing seat 52 to be fixedly connected with the main shaft 22, and its inner ring is clearance fit with the connecting shaft 4.

[0032] Reference Figure 2, the connecting shaft 4 is provided with a connecting groove 41 along its axial direction, and the hot and cold air exchange pipeline is connected to the evaporator 3 through the copper tube through the connecting groove 41, so this structure can compensate for the length and diameter changes of the connecting shaft 4 of the evaporator 3 caused by the hot and cold changes and manufacturing and assembly errors. Because the refrigeration pipe passes through the inside of the connecting shaft 4, the connecting shaft 4 will have hot and cold changes, and the hot and cold changes will cause slight changes in size; in addition, the connecting shaft 4 becomes a secondary hyperstatic beam after adding the first bearing seat assembly, which is easy to cause assembly stress due to processing errors and other reasons. Therefore, the first bearing inner ring of the first bearing assembly and the connecting shaft 4 are clearance-matched, and the first bearing inner ring is not axially fixed, but is installed by the inner ring clearance, just to compensate for the length and diameter changes of the connecting shaft caused by hot and cold changes and manufacturing and assembly errors.

[0033] Reference Figure 3 The limit assembly is arranged at the outer end of the first bearing 51 assembly, that is, the side of the first bearing 51 assembly away from the evaporator 3, thereby reducing the distance between the limit assembly and the first bearing 51 assembly. When the limit assembly is close to the first bearing 51 assembly, it can reduce the unbalanced torsional force on the limit assembly when the main shaft 22 rotates, so as to reduce the stress concentration at the limit claw 11. It can reduce the tail swing of the mechanism and the friction noise during operation. At the same time, reducing the unbalanced torsional force can also reduce the output torque of the motor, so as to improve the efficiency of the turntable.

[0034] Reference Figure 1 , Figure 4 and Figure 5 The interference force is generated due to the imbalance of the moving parts. The interference force caused by high-speed rotation and angular vibration can be reduced from the source, that is, a leveling assembly 7 is symmetrically arranged on the rotating frame 21. In this embodiment, the above-mentioned leveling assembly 7 is symmetrically arranged on the upper and lower sides of the rotating assembly. The leveling assembly 7 can control the unbalanced torque within a reasonable range by making the rotating frame 21 tend to balance, thereby reducing the influence on the fixation of the evaporator 3. The leveling assembly 7 includes a base 71 and a plurality of leveling plates 72. The base 71 is fixedly connected to the rotating frame 21 by fastening bolts, and all the leveling plates 72 are sleeved on the base 71. The leveling plate 72 can move in the vertical direction to change its position on the base 71. After the adjustment is completed, the leveling plate 72 can be fixed to the base 71 by a fastener 721. In this embodiment, the fastener 721 is preferably a fastening bolt. A through groove is provided on the thread of the base 71, and the fastening screw can be aligned and screwed into the through groove, which can prevent the leveling plate 72 from loosening after the equipment has been running for a long time, thereby improving the reliability of the leveling assembly. Because the rotating frame 21 is U-shaped, in order to facilitate the fixation of the base 71 disposed above the rotating frame 21 , the base 71 located above the rotating frame 21 is fixedly connected to the rotating frame 21 via a connecting seat 73 .

[0035] The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A turntable with a built-in evaporator, characterized in that: It includes a table body, a box body, a rotating frame fixed to the box body, and an evaporator arranged inside the box body, the rotating frame is rotatably connected to the table body through a main shaft; the evaporator is fixedly connected to the table body through a connecting shaft, and the connecting shaft is arranged to pass through the axial direction of the main shaft; the connecting shaft is rotatably connected to the main shaft through a first bearing assembly, and the connecting shaft is rotatably connected to the rotating frame through a second bearing assembly; the first bearing assembly includes a first bearing, and the second bearing assembly includes a second bearing; the connecting shaft is provided with a connecting groove along its axial direction.

2. The turntable with built-in evaporator as claimed in claim 1, characterized in that: The first bearing assembly also includes a bearing seat, and the bearing seat is connected to the main shaft.

3. The turntable with built-in evaporator as claimed in claim 2, characterized in that: The outer ring of the first bearing is fixed to the bearing seat, and the inner ring of the first bearing is loosely matched with the connecting shaft.

4. The turntable with built-in evaporator as claimed in claim 1, characterized in that: The rotating frame is symmetrically provided with leveling components to adjust the torque of the rotating frame.

5. The turntable with built-in evaporator as claimed in claim 4, characterized in that: The leveling assembly comprises a base and a plurality of leveling plates sleeved on the base. The leveling plates can move in a vertical direction and can be fixedly connected to the base via fasteners.

6. The turntable with built-in evaporator according to claim 1, characterized in that: The connecting shaft is fixed to the platform body through a limiting assembly, and the limiting assembly includes a limiting claw and a plurality of protrusions engaged therewith, the limiting claw is arranged in the platform body, and all the protrusions are arranged at the end of the connecting shaft and can cooperate with the limiting claw to limit the rotation of the connecting shaft.

7. The turntable with built-in evaporator according to claim 6, characterized in that: The limiting assembly is located at the outer end of the first bearing assembly.

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