Fixed evaporator shaft system structure suitable for rotary incubator

Abstract

The invention discloses a fixed evaporator shafting structure suitable for a rotary incubator, which belongs to the technical field of inertial devices and comprises a rotary shaft c, a positioning pipe, a connecting pipe, two positioning sleeves and a motor. The rotating shaft c is supported on the base through a bearing; one end of the rotating shaft c extends out of the base and is fixedly connected with the frame; the positioning pipe is coaxially sleeved in the rotating shaft c; one end of the positioning pipe extends out of the rotating shaft c and is fixedly connected with the base, and the other end is supported on the frame through a bearing; the connecting pipe is coaxially sleeved in the positioning pipe; one end of the connecting pipe extends out of the positioning pipe and is fixedly connected with the positioning pipe; the other end of the positioning pipe sequentially extends out of the positioning pipe frame and then extends into the incubator to be fixedly connected with the evaporator; the connecting pipe is supported in the positioning pipe through the two positioning sleeves; and two copper pipes on the evaporator penetrate through the connecting pipe and are connected with an external compressor. According to the invention, the problems of shafting support, heat insulation and rotary sealing in the testing process of the double-shaft incubator turntable integrating the incubator and the turntable can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of inertial devices, and in particular relates to a fixed evaporator shaft system structure suitable for a rotary thermostat. Background Art

[0002] Inertial devices are widely used in the fields of aerospace and navigation, and have a wide temperature range of use environment requirements (that is, inertial devices can work normally within a wide temperature range). The two-dimensional inertial navigation test equipment with integrated temperature chamber is used for angular positioning and rate testing of inertial devices, and can also provide a comprehensive calibration environment for high and low temperatures and angular motion for inertial devices. In the two-dimensional inertial navigation test equipment with integrated temperature chamber, the temperature chamber is rotatably mounted on the frame through the pitch rotation axis to perform pitch angular motion. The workbench for mounting the inertial device to be tested can be rotatably mounted in the temperature chamber to perform azimuth angular motion. During the test, the temperature chamber rotates continuously with the frame (pitch rotation axis).

[0003] The two-dimensional inertial navigation test equipment with integrated temperature chamber includes: high temperature test and low temperature test during use. When performing high temperature test, the temperature chamber uses internal resistance wire as heating element to simulate high temperature environment. In order to ensure the continuity and stability of power supply of the two-dimensional inertial navigation test equipment with integrated temperature chamber under the condition of continuous rotation of the temperature chamber, the temperature chamber uses conductive slip rings to transmit current. When performing low temperature test, the temperature chamber uses refrigerant to cool down through the built-in evaporator. In order to transmit high-pressure refrigerant between rotating parts and static parts, a specially designed liquid slip ring is usually used. This liquid slip ring can not only withstand the passage of high-pressure refrigerant, but also ensure the continuous flow of refrigerant during rotation, thereby maintaining the required low temperature environment inside the temperature chamber. In order to prevent the leakage of refrigerant in the liquid slip ring, the design of the liquid slip ring usually includes high-precision sealing technology (such as sealing rings, etc.) to ensure the sealing and long-term stability during the transmission of high-pressure refrigerant.

[0004] However, with the long-term use of the two-dimensional inertial navigation test equipment of the integrated temperature box, the sealing ring in the liquid slip ring will inevitably wear out, resulting in the leakage of refrigerant, making the two-dimensional inertial navigation test equipment of the integrated temperature box unable to form a low-temperature environment and fail. Since the liquid slip ring is expensive to repair or replace, it will increase the maintenance cost of the equipment. Therefore, a new technology is needed to solve the problem of continuous transmission of refrigerant at low temperatures. Summary of the invention

[0005] In view of this, the present invention provides a fixed evaporator shaft system structure suitable for a rotary temperature chamber, which can solve the problems of shaft system support, heat insulation and rotary sealing faced by a two-dimensional inertial navigation test equipment with an integrated temperature chamber during the test process, and is suitable for testing inertial devices in a wide temperature range environment.

[0006] The present invention is achieved through the following technical solutions:

[0007] A fixed evaporator shaft system structure suitable for a rotary thermostat, wherein the evaporator is located in the thermostat, the thermostat is fixedly connected to a frame, and the frame is rotatably supported on a base through the shaft system structure;

[0008] The shaft system structure includes: a rotating shaft c, a positioning tube, a connecting tube, two positioning sleeves and a motor;

[0009] The rotating shaft c is a hollow structure, supported on the base by a bearing, and can rotate around its own axis under the drive of the motor; one end of the rotating shaft c extends out of the base and is fixedly connected to the frame;

[0010] The positioning tube is coaxially sleeved in the rotating shaft c; one end of the positioning tube extends out of the rotating shaft c and is fixedly connected to the base, and the other end is supported on the frame through a bearing;

[0011] The connecting pipe is coaxially sleeved in the positioning pipe; one end of the connecting pipe extends out of the positioning pipe and is fixedly connected to the positioning pipe; the other end extends out of the positioning pipe frame in turn, extends into the temperature box, and is fixedly connected to the evaporator; the connecting pipe is supported in the positioning pipe by two positioning sleeves;

[0012] The two copper tubes on the evaporator are connected to the external compressor through the connecting pipe.

[0013] Furthermore, an annular cavity is formed between the outer circumferential surface of the connecting tube and the inner circumferential surface of the positioning tube; the annular cavity is filled with heat insulating material.

[0014] Furthermore, the shaft system structure further includes: a fixing ring;

[0015] The fixing ring is coaxially sleeved outside the positioning tube; the fixing ring is fixedly connected to the positioning tube and the base at the same time.

[0016] Furthermore, the fixing ring is a bearing; the inner ring of the bearing is fixedly connected to the positioning tube, and the outer ring is fixedly connected to the base.

[0017] Furthermore, the shaft system structure further includes: a heat-insulating shaft sleeve;

[0018] The heat-insulating sleeve is located between the outer circumferential surface of the connecting pipe and the temperature box; the heat-insulating sleeve is coaxially sleeved outside the connecting pipe and fixed on the positioning pipe.

[0019] Furthermore, the shaft system structure further includes: a dynamic seal and a static seal;

[0020] The dynamic seal is installed between the outer circumferential surface of the heat-insulating sleeve and the temperature box;

[0021] The static seal is installed on the gap between the adapter of the dynamic seal and the temperature box.

[0022] Furthermore, the motor is a ring-shaped motor, and the motor is coaxially sleeved outside the positioning tube; the rotor of the motor is fixedly connected to the rotating shaft c, and the stator of the motor is fixedly connected to the base.

[0023] Furthermore, the shaft system structure further includes: an electromagnetic chuck;

[0024] The electromagnetic chuck is an annular structure and is coaxially sleeved outside the positioning tube; the electromagnetic chuck includes: a coil and a friction plate; the coil is fixedly connected to the base, one end of the friction plate is fixedly connected to the rotor of the motor, and the other end of the friction plate is arranged opposite to the coil.

[0025] Furthermore, the shaft system structure further includes: a distance sensor;

[0026] The distance sensor is installed on the temperature box;

[0027] The distance sensor is electrically connected to an external control system; the external control system is electrically connected to the electromagnetic chuck; and a set value of the distance is provided in the external control system.

[0028] Furthermore, the shaft system structure further includes: a heat insulation pad;

[0029] The heat insulation pad is an annular structure; the heat insulation pad is coaxially sleeved outside the positioning tube and is located between the friction plate and the rotor of the motor;

[0030] One end of the thermal insulation pad is fixedly connected to the rotor of the motor, and the other end of the thermal insulation pad is fixedly connected to the friction plate.

[0031] Beneficial effects:

[0032] (1) The present invention is a fixed evaporator shaft system structure suitable for a rotary thermostat, wherein the rotating shaft c is supported on a base through a bearing and can rotate around its own axis under the drive of a motor, the positioning tube is coaxially sleeved in the rotating shaft c, the connecting tube is coaxially sleeved in the positioning tube, one end of the connecting tube extends out of the positioning tube and is fixedly connected to the positioning tube, and the other end extends out of the positioning tube frame in turn, extends into the thermostat, and is fixedly connected to the evaporator; the two-dimensional inertial navigation test equipment with an integrated thermostat is a high-precision device for testing inertial devices, wherein the insulation, sealing and transmission of the refrigerant are the key points to ensure the measurement accuracy; the shaft system structure can realize the dynamic and static separation between the thermostat and the evaporator, that is, the evaporator can always maintain a complete relative to the ground. The shaft system structure does not require a liquid slip ring to solve the problem of refrigerant transmission during rotation, and can avoid problems such as freezing and jamming of moving parts, reduced measurement accuracy, damage and failure of test equipment, and expensive subsequent repair and maintenance caused by refrigerant leakage due to wear of the sealing ring in previous test equipment. In the shaft system structure, the connecting pipe is supported in the positioning pipe by two positioning sleeves, and one end of the positioning pipe is fixedly connected to the base, and the other end is supported on the frame by a bearing. This connection method can provide stable support for the connecting pipe, can provide better support rigidity for the evaporator, and can further ensure the positioning accuracy of the test equipment when used in the test equipment.

[0033] (2) The present invention is a fixed evaporator shaft structure suitable for a rotary thermostat, wherein the annular cavity formed between the outer circumference of the connecting tube and the inner circumference of the positioning tube is filled with a heat-insulating material. The heat-insulating material can prevent the low temperature of the two copper tubes serving as refrigerant flow channels from being transmitted to the interior of the shaft structure, thereby affecting the structural accuracy of the shaft structure, and at the same time prevent the low temperature from generating condensed water inside the shaft structure, thereby causing equipment damage and other problems. The two positioning sleeves located at both ends of the heat-insulating material can not only provide stable support for the connecting tube, but also prevent the heat-insulating material from overflowing from the gap between the connecting tube and the positioning tube.

[0034] (3) The present invention provides a fixed evaporator shaft structure suitable for a rotary thermostat, wherein the fixing ring is fixedly connected to the positioning tube and the base at the same time, and can provide more stable support for the connecting tube of the shaft structure, thereby further improving the structural accuracy of the shaft structure.

[0035] (4) In a fixed evaporator shaft system structure suitable for a rotary thermostat of the present invention, a fixed ring adopts a bearing. Since the bearing is a standard part, it is beneficial to ensure the structural accuracy of the shaft system, thereby ensuring the measurement accuracy of the test equipment.

[0036] (5) The present invention provides a fixed evaporator shaft system structure suitable for a rotary thermostat, wherein the heat-insulating shaft sleeve is located between the outer circumferential surface of the connecting pipe and the thermostat, thereby preventing the temperature inside the thermostat from leaking out of the thermostat and affecting the refrigeration effect inside the thermostat.

[0037] (6) A fixed evaporator shaft system structure suitable for a rotary thermostat of the present invention further includes a dynamic seal and a static seal. The dynamic seal and the static seal can further prevent the temperature in the thermostat from leaking outward.

[0038] (7) A fixed evaporator shaft system structure suitable for a rotating thermostat of the present invention also includes an electromagnetic suction cup, which can fix the motor rotor through the adsorption effect of the electromagnetic suction cup, so that the rotating shaft c cannot rotate; in the test equipment, due to the heavy weight of the thermostat door, after the motor is closed and before the thermostat door is opened, a mechanical locking device is used to lock the position of the thermostat; if the operator forgets to plug in the mechanical locking device before opening the door, the eccentric load force generated during the opening of the thermostat door may cause the motor to disengage or lose control, causing the thermostat to rotate, thereby causing harm to the operator. The electromagnetic suction cup can stop the thermostat at a certain angle, preventing the eccentric load force generated during the opening of the thermostat door from causing the motor to disengage or lose control and causing the thermostat to rotate, thereby ensuring the safety of the operator.

[0039] (8) The present invention provides a fixed evaporator shaft structure suitable for a rotary thermostat, wherein a distance sensor is used to measure the opening distance of the thermostat door, the distance sensor is electrically connected to an external control system, and the external control system is electrically connected to an electromagnetic suction cup. By using the distance sensor and the external control system in coordination, the motor of the shaft structure can be automatically locked, so that the thermostat that rotates synchronously with the rotor of the motor can stop at any angle position, thereby preventing the thermostat from tipping over during the door opening process or the use of the thermostat, thereby ensuring the safety of the operator.

[0040] (9) The present invention is a fixed evaporator shaft system structure suitable for a rotary temperature box, wherein the thermal insulation pad is located between the friction plate and the rotor of the motor. The thermal insulation pad can prevent the heat generated by the coil when the electromagnetic suction cup is working from affecting the structural accuracy of the components of the turntable shaft system structure other than the electromagnetic suction cup, thereby ensuring the measurement accuracy of the test equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is the appearance diagram of the two-dimensional inertial navigation test equipment with integrated temperature chamber;

[0042] Figure 2 It is a structural principle diagram of the present invention;

[0043] Among them, 1-axis structure, 101-rotating axis c, 102-bearing a, 103-bearing b, 104-positioning tube, 105-connecting tube, 106-insulation material, 107-positioning sleeve, 108-fixing ring, 109-motor, 110-electromagnetic suction cup, 111-insulation pad, 112-insulation sleeve, 113-dynamic seal, 114-static seal, 2-base, 3-frame, 4-temperature box, 401-copper tube, 5-evaporator, 6-workbench, 7-tested product. DETAILED DESCRIPTION

[0044] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0045] This embodiment provides a fixed evaporator shaft system structure suitable for a rotary thermostat, such as Figure 1 As shown, the shaft system structure 1 is a component of a two-dimensional inertial navigation test device with an integrated temperature chamber (the device is referred to as a test device in the following description).

[0046] The test equipment further comprises: a base 2, a frame 3, a temperature box 4, an evaporator 5, a workbench 6 and a product to be tested 7 (ie, an inertial device).

[0047] The base 2 is a U-shaped structure, and the open end of the U-shaped structure is placed on the ground facing upward.

[0048] The two opposite ends of the frame 3 are rotatably mounted between the two vertical parts of the base 2 through the shaft structure 1 and the rotation axis a, respectively. The vertical part connected through the shaft structure 1 is the vertical part a, and the vertical part connected through the rotation axis a is the vertical part b. The shaft structure 1 and the rotation axis a are coaxial. The axes of the shaft structure 1 and the rotation axis a are both along the normal direction of the vertical part a and the vertical part b.

[0049] The temperature box 4 is fixedly connected to the frame 3; the evaporator 5 is located in the temperature box 4; the workbench 6 is rotatably connected to the inner bottom surface of the temperature box 4 through the rotating shaft b. The axis of the rotating shaft b is arranged along the vertical direction; that is, the workbench 6 is a rotating workbench that can rotate around the vertical direction. The product 7 to be tested is installed on the workbench 6.

[0050] The temperature box 4 rotates with the frame 3 around the axis of the shaft structure 1, and then the workbench 6 inside the temperature box 4 rotates with the temperature box 4 around the axis of the shaft structure 1. As a result, the product 7 under test can rotate around the axis of the shaft structure 1 (pitch adjustment) while rotating with the workbench 6 around the vertical direction (azimuth adjustment), thereby achieving pitch movement and azimuth movement.

[0051] The shaft system structure 1 is used for dynamic and static separation between the temperature box 4 and the evaporator 5, and provides stable support for the evaporator 5. Figure 2 As shown, the shaft system structure 1 includes: a rotating shaft c101, more than two bearings a102, more than one bearing b103, a positioning tube 104, a connecting tube 105, a heat insulating material 106, two positioning sleeves 107, a fixing ring 108 and a motor 109.

[0052] The rotating shaft c101 is the main shaft of the shaft system structure 1. The rotating shaft c101 is a hollow structure, and the rotating shaft c101 is supported on the vertical portion a of the base 2 through more than two bearings a102. The more than two bearings a102 realize the dynamic and static separation between the rotating shaft c101 and the base 2, and provide a stable support for the rotating shaft c101; one end of the rotating shaft c101 extends out of the base 2 and is fixedly connected to the frame 3. The frame 3 rotates with the rotating shaft c101.

[0053] The positioning tube 104 is coaxially sleeved in the rotating shaft c101. One end of the positioning tube 104 extends out of the rotating shaft c101 and is fixedly connected to the vertical portion a of the base 2. The other end of the positioning tube 104 extends out of the rotating shaft c101 and is supported on the frame 3 through one or more bearings b103. The one or more bearings b103 are used for dynamic and static separation between the positioning tube 104 and the frame 3, and are also used to provide stable support for the positioning tube 104. In this embodiment, there are preferably two bearings b103. There is a clearance fit between the positioning tube 104 and the rotating shaft c101, and there is relative rotation. Let the end of the positioning tube 104 fixedly connected to the vertical portion a of the base 2 be end a, and the other end be end b. The inner wall surface of the end b of the positioning tube 104 is processed with an annular limiting boss.

[0054] The connecting tube 105 is coaxially sleeved in the positioning tube 104, and an annular cavity is formed between the outer circumferential surface of the connecting tube 105 and the inner circumferential surface of the positioning tube 104. The two ends of the connecting tube 105 are end c and end d respectively. The end c of the connecting tube 105 is processed with a limit plate. After the end c of the connecting tube 105 passes through the positioning tube 104, the limit plate on the end c abuts against the end a of the positioning tube 104, and the end d of the connecting tube 105 extends out of the end b of the positioning tube 104. The limit plate of the connecting tube 105 is fixedly connected to the end a of the positioning tube 104 and the base 2 at the same time. The end d of the connecting tube 105 passes through the thermostat 4 and is fixedly connected to the evaporator 5 in the thermostat 4. The connecting tube 105 is used to support the evaporator 5. Two copper tubes 401 are connected to the evaporator 5, and the two copper tubes 401 are used for the flow in and out of the refrigerant respectively. The two copper tubes 401 pass through the connecting tube 105 and are connected to the external compressor.

[0055] The annular cavity between the outer circumference of the connecting tube 105 and the inner circumference of the positioning tube 104 is filled with a heat insulating material 106, and the two positioning sleeves 107 are respectively located at the two ends of the heat insulating material 106 (i.e., the two ends of the annular cavity), and respectively abut against the limiting plate of the connecting tube 105 and the limiting boss of the positioning tube 104. In this embodiment, the heat insulating material 106 is a soft foam material, and the two positioning sleeves 107 are used to support and position the connecting tube 105, and at the same time, to prevent the heat insulating material 106 from overflowing from the gap between the positioning tube 104 and the connecting tube 105.

[0056] The fixing ring 108 is coaxially sleeved outside the positioning tube 104. The fixing ring 108 is fixedly connected to the positioning tube 104 and the base 2 at the same time. The fixing ring 108 is used to support the positioning tube 104. In this embodiment, the fixing ring 108 is preferably a bearing, the inner ring of the bearing is fixedly connected to the positioning tube 104, and the outer ring of the bearing is fixedly connected to the base 2. Since the bearing is a standard part, the structural accuracy of the fixed shaft system structure 1 can be improved, thereby ensuring the measurement accuracy of the two-dimensional inertial navigation test equipment of the integrated temperature chamber.

[0057] The end a of the positioning tube 104 extends out of the rotation axis c101, and the motor 109 is a ring-shaped motor, and the motor 109 is coaxially sleeved outside the end a of the positioning tube 104. The motor 109 includes a stator and a rotor. The rotor of the motor 109 is coaxially fixedly connected to the rotation axis c101, and the stator of the motor 109 is fixedly connected to the vertical portion a of the base 2. The motor 109 is used to drive the rotation of the rotation axis c101, thereby realizing the pitching movement of the temperature box 4.

[0058] The shaft system structure 1 in this embodiment can be applied to most test equipment with a temperature chamber that continuously rotates, and has good application prospects and promotion value.

[0059] Working principle:

[0060] In the two-dimensional inertial navigation test equipment with integrated temperature box, refrigeration is achieved through the evaporator 5 in the temperature box 4. The evaporator 5 achieves refrigeration through the refrigerant. The two copper tubes 401 on the evaporator 5 are both flow channels for the refrigerant, and the two copper tubes 401 are used for the flow in and out of the refrigerant respectively. The two copper tubes 401 are connected to the compressor through the shaft structure 1, and the refrigerant in the evaporator 5 flows into the compressor through a copper tube 401, and then flows back from the compressor to the evaporator 5 through the copper tube 401, thereby exchanging the refrigerant. When the refrigerant is exchanged, the temperature of the two copper tubes 401 is very low (up to -50°C).

[0061] In the present embodiment, a connecting pipe 105 is provided in the shaft structure 1, and the connecting pipe 105 is separated from the rotating shaft c101 in a dynamic and static manner. That is, when the frame 3 and the temperature box 4 rotate with the rotating shaft c101 in the shaft structure 1, the connecting pipe 105 does not rotate, so that the evaporator 5 can be in a completely stationary state relative to the ground. Therefore, the two copper tubes 401 used for the flow of cold medium are both in a completely stationary state, thereby avoiding damage to the two copper tubes 401 and causing leakage of the refrigerant inside the copper tubes 401, thereby ensuring the cooling effect of the evaporator 5 on the internal environment of the temperature box 4. At the same time, the heat-insulating material filled between the positioning tube 104 and the connecting pipe 105 can further prevent the temperature of the copper tube 401 from affecting the structural accuracy of the shaft structure 1, and can prevent the low temperature of the copper tube 401 from causing condensed water to be generated inside the shaft structure 1, thereby causing damage to the two-dimensional inertial navigation test equipment of the integrated temperature box or affecting the accuracy of the measuring equipment.

[0062] At the same time, the shaft structure 1 in this embodiment can improve the support rigidity provided by the shaft structure 1 to the evaporator 5 through the bearing a102, the bearing b103, the fixing ring 108 and the positioning sleeve 107, thereby reducing the rotational friction and improving the positioning accuracy of the test equipment.

[0063] Embodiment 2:

[0064] This embodiment discloses a fixed evaporator shaft structure suitable for a rotary thermostat, based on the shaft structure 1 in Embodiment 1. The shaft structure 1 further includes: a heat-insulating shaft sleeve 112 , a dynamic seal 113 and a static seal 114 .

[0065] The heat-insulating sleeve 112 is located between the outer circumference of the end d of the connecting tube 105 and the temperature box 4. The heat-insulating sleeve 112 is coaxially sleeved outside the connecting tube 105 and fixed on the end b of the positioning tube 104. The heat-insulating sleeve 112 is used to prevent the temperature in the temperature box 4 from flowing out.

[0066] The dynamic seal 113 is installed between the outer circumferential surface of the heat-insulating sleeve 112 and the temperature box 4 .

[0067] The static seal 114 is installed on the gap between the adapter of the dynamic seal 113 and the temperature box 4. The dynamic seal 113 and the static seal 114 can improve the sealing degree of the temperature box 4, further prevent the temperature in the temperature box 4 from flowing out, and prevent the refrigerant in the temperature box 4 from flowing out, affecting the structural accuracy of the turntable shaft system structure 1, thereby affecting the measurement accuracy of the test equipment.

[0068] Embodiment 3:

[0069] This embodiment discloses a fixed evaporator shaft structure suitable for a rotary thermostat, based on the shaft structure 1 in Embodiment 1. The shaft structure 1 further includes: an electromagnetic chuck 110 and a heat insulation pad 111 for braking the motor 109 .

[0070] The electromagnetic chuck 110 is an annular structure, and the electromagnetic chuck 110 is coaxially sleeved on the outside of the end a of the positioning tube 104. The electromagnetic chuck 110 includes: a coil and a friction plate. The coil is mounted on the base 2, one end of the friction plate is fixedly connected to the rotor of the motor 109, and the other end of the friction plate is arranged opposite to the coil. A spring plate is arranged inside the friction plate. When the electromagnetic chuck 110 is powered on, the current passes through the coil to generate a magnetic field, and the friction plate is attracted to the coil by the magnetic force of the magnetic field (the spring plate is in a stretched state at this time), thereby fixing the rotor of the motor 109, so that the rotating shaft c101 cannot rotate, which can prevent the motor from being disengaged or out of control due to the eccentric load generated during the opening of the thermostat door, causing the thermostat to rotate. When the electromagnetic chuck 110 is powered off, the current in the coil disappears, the magnetic field disappears, and the magnetism is released. The friction plate is separated from the coil, the rotor of the motor 109 is released, and the rotating shaft c101 rotates again.

[0071] The thermal insulation pad 111 is an annular structure. The thermal insulation pad 111 is coaxially sleeved outside the positioning tube 104 and is located between the friction plate and the rotor of the motor 109. One end of the thermal insulation pad 111 is fixedly connected to the rotor of the motor 109, and the other end of the thermal insulation pad 111 is fixedly connected to the friction plate. The thermal insulation pad 111 can prevent the heat generated by the coil when the electromagnetic chuck 110 is working from affecting the structural accuracy of the components of the turntable shaft system structure 1 other than the electromagnetic chuck 110, thereby ensuring the measurement accuracy of the test equipment.

[0072] Embodiment 4:

[0073] This embodiment discloses a fixed evaporator shaft system structure suitable for a rotary thermostat, based on the shaft system structure 1 in embodiment 3. The shaft system structure 1 further includes: a distance sensor.

[0074] The distance sensor is installed on the thermostat 4. The distance sensor is used to measure the opening distance of the thermostat door (ie the distance between the thermostat door and the thermostat outer frame).

[0075] The distance sensor is electrically connected to an external control system cabinet. The external control system is electrically connected to the electromagnetic chuck 110. The external control system is provided with a set value of the distance.

[0076] After the distance sensor obtains the opening distance of the thermostat door, it converts the opening distance into distance information and transmits it to the external control system. The external control system compares the received distance information with the set value: when the distance information is less than the set value, the electromagnetic chuck 110 is in a power-off state, the motor 109 works normally, and the thermostat 4 rotates. When the distance information is greater than or equal to the set value, the external control system controls the electromagnetic chuck 110 to be powered on, the motor 109 is locked (electromagnetic locking) and stops working, and the thermostat 4 stops rotating.

[0077] Through the cooperation of the distance sensor and the external control system, the shaft structure 1 motor 109 can be automatically locked, so that the incubator 4 that rotates synchronously with the rotor of the motor 109 can stop at any angle position, thereby preventing the incubator 4 from tipping over during the opening of the door and the use of the incubator 4, thereby ensuring the safety of the operator.

[0078] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fixed evaporator shaft system structure suitable for a rotary thermostat, wherein the evaporator (5) is located in the thermostat (4), the thermostat (4) is fixedly connected to a frame (3), and the frame (3) is rotatably supported on a base (2) through the shaft system structure (1); It is characterized in that The shaft system structure (1) comprises: a rotating shaft c (101), a positioning tube (104), a connecting tube (105), two positioning sleeves (107) and a motor (109); The rotating shaft c (101) is a hollow structure, supported on the base (2) by a bearing, and can rotate around its own axis under the drive of the motor (109); one end of the rotating shaft c (101) extends out of the base (2) and is fixedly connected to the frame (3); The positioning tube (104) is coaxially sleeved in the rotating shaft c (101); one end of the positioning tube (104) extends out of the rotating shaft c (101) and is fixedly connected to the base (2), and the other end is supported on the frame (3) through a bearing; The connecting tube (105) is coaxially sleeved in the positioning tube (104); one end of the connecting tube (105) extends out of the positioning tube (104) and is fixedly connected to the positioning tube (104); the other end extends out of the positioning tube (104) frame (3) in turn, extends into the temperature box (4), and is fixedly connected to the evaporator (5); the connecting tube (105) is supported in the positioning tube (104) by two positioning sleeves (107); The two copper tubes (401) on the evaporator (5) pass through the connecting pipe (105) to connect to the external compressor.

2. A fixed evaporator shaft system structure suitable for a rotary thermostat as claimed in claim 1, characterized in that: An annular cavity is formed between the outer circumferential surface of the connecting tube (105) and the inner circumferential surface of the positioning tube (104); the annular cavity is filled with a heat insulating material (106).

3. A fixed evaporator shaft system structure suitable for a rotary thermostat as claimed in claim 1, characterized in that: The shaft system structure (1) further includes: a fixing ring (108); The fixing ring (108) is coaxially sleeved outside the positioning tube (104); the fixing ring (108) is fixedly connected to the positioning tube (104) and the base (2) at the same time.

4. A fixed evaporator shaft system structure suitable for a rotary thermostat as claimed in claim 3, characterized in that: The fixing ring (108) is a bearing; the inner ring of the bearing is fixedly connected to the positioning tube (104), and the outer ring is fixedly connected to the base (2).

5. A fixed evaporator shaft system structure suitable for a rotary thermostat as claimed in claim 1, characterized in that: The shaft system structure (1) further comprises: a heat-insulating shaft sleeve (112); The heat-insulating sleeve (112) is located between the outer circumferential surface of the connecting tube (105) and the temperature box (4); the heat-insulating sleeve (112) is coaxially sleeved outside the connecting tube (105) and fixed on the positioning tube (104).

6. A fixed evaporator shaft system structure suitable for a rotary thermostat as claimed in claim 5, characterized in that: The shaft system structure (1) further comprises: a dynamic seal (113) and a static seal (114); The dynamic seal (113) is installed between the outer circumferential surface of the heat-insulating shaft sleeve (112) and the temperature box (4); The static seal (114) is installed on the gap between the adapter of the dynamic seal (113) and the temperature box (4).

7. A fixed evaporator shaft system structure suitable for a rotary thermostat as claimed in claim 1, characterized in that: The motor (109) is a ring-shaped motor, and the motor (109) is coaxially sleeved outside the positioning tube (104); the rotor of the motor (109) is fixedly connected to the rotating shaft c (101), and the stator of the motor (109) is fixedly connected to the base (2).

8. A fixed evaporator shaft system structure suitable for a rotary thermostat as claimed in claim 1, characterized in that: The shaft system structure (1) further includes: an electromagnetic chuck (110); The electromagnetic suction cup (110) is an annular structure, and the electromagnetic suction cup (110) is coaxially sleeved outside the positioning tube (104); the electromagnetic suction cup (110) comprises: a coil and a friction plate; the coil is fixedly connected to the base (2), one end of the friction plate is fixedly connected to the rotor of the motor (109), and the other end of the friction plate is arranged opposite to the coil.

9. A fixed evaporator shaft system structure suitable for a rotary thermostat as claimed in claim 8, characterized in that: The shaft system structure (1) further includes: a distance sensor; The distance sensor is mounted on the temperature box (4); The distance sensor is electrically connected to an external control system; the external control system is electrically connected to the electromagnetic chuck (110); and a distance setting value is provided in the external control system.

10. A fixed evaporator shaft system structure suitable for a rotary thermostat as claimed in claim 8 or 9, characterized in that: The shaft system structure (1) further comprises: a heat insulation pad (111); The heat insulation pad (111) is an annular structure; the heat insulation pad (111) is coaxially sleeved outside the positioning tube (104) and is located between the friction plate and the rotor of the motor (109); One end of the heat insulation pad (111) is fixedly connected to the rotor of the motor (109), and the other end of the heat insulation pad (111) is fixedly connected to the friction plate.

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