Throttling refrigerator capable of accurately controlling temperature

Abstract

The precise temperature control throttling refrigerator comprises a mandrel and a driving part, a finned tube heat exchanger is arranged outside the mandrel, a valve needle is arranged in the mandrel, a refrigerator base is arranged at one end of the mandrel, a refrigerator flange is arranged at the other end of the mandrel, and a throttling block is arranged on the refrigerator flange; the driving part is arranged in the mandrel, the transmission mechanism comprises a conversion unit, an outer transmission sleeve, an inner transmission sleeve and a centering unit, and the conversion unit is connected with the driving part and the valve needle and used for converting rotary motion of the driving part into linear motion of the valve needle; the centering unit is arranged in the outer transmission sleeve and used for centering the inner transmission sleeve and reducing heat conduction of the inner transmission sleeve and the outer transmission sleeve. According to the refrigerator, active control over the flow of the refrigerator is achieved through the motor, and the refrigerator has a wider working temperature area and more precise temperature control precision. And meanwhile, the centering unit is adopted to isolate the influence of low temperature on the motor, so that the normal operation of the motor in a low-temperature working state is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of throttling refrigerators, and in particular to a throttling refrigerator with precise temperature control. Background Art

[0002] Flow regulating throttling coolers usually use bellows or memory alloy self-adjusting mechanisms to automatically adjust the flow at different refrigeration temperatures. Figure 1 As shown, the existing bellows self-adjusting throttling refrigerator includes: an air inlet 11, a finned tube heat exchanger 12, a core shaft 13, a throttle valve 14, a valve needle seat 15 and a bellows self-adjusting mechanism 16. During operation, high-pressure gas enters the throttling refrigerator from the air inlet 11, flows inside the finned tube heat exchanger 12, and is ejected through the throttle valve 14 to achieve throttling and cooling. The cooled gas then exchanges heat outside the finned tube heat exchanger 12 to pre-cool the intake air, thereby gradually liquefying the gas to reach the refrigeration temperature. When the gas working medium is liquefied, the gas sealed in the bellows self-adjusting mechanism 16 is also liquefied. The bellows contracts and drives the valve needle seat 15 to move axially, reducing the flow area of the throttle valve 4, reducing the flow rate and the evaporation chamber pressure, thereby reducing the refrigeration temperature.

[0003] The bellows self-adjusting mechanism 16 senses the refrigeration temperature of the refrigerator. When the refrigerant is liquefied, the gas sealed inside the bellows is also liquefied, driving the bellows to contract to achieve valve needle movement and flow regulation. This adjustment method is passive and cannot actively control the throttle valve opening. The bellows will only make the next adjustment action when the refrigeration temperature rises and the gas sealed inside the bellows self-adjusting mechanism 16 is vaporized again, making it impossible to achieve precise control of the refrigeration temperature. On the other hand, existing flow-regulating throttling refrigerators can only operate in the liquid phase of the gas working medium, and the temperature adjustment range is very limited, making it impossible to achieve large-scale temperature adjustment in the gas phase.

[0004] CN 111998567 A discloses an actively controlled, self-adjusting throttling refrigerator. This utilizes a stepper motor with a linearly movable motor shaft to push a valve needle to extend and retract axially along the central axis of a spring, thereby achieving active control. However, when the refrigerator reaches a low operating temperature, components directly in contact with the cryogenic working medium, such as the valve needle, are cooled to a low temperature, causing the stepper motor to operate at a low temperature, or even to become inoperable due to excessively low temperatures. Summary of the Invention

[0005] To address these issues, the present invention provides a precisely controlled, temperature-controlled throttling cooler. This system uses a motor to actively control the cooler's flow rate. Compared to traditional passively controlled, regulating coolers, it boasts a wider operating temperature range and more precise temperature control. Furthermore, the use of a limit ring, a centering ring, and a hollow, thin-walled transmission rod isolates the motor from the effects of low temperatures, ensuring proper operation even under low-temperature conditions.

[0006] Specifically, the present invention is achieved as follows:

[0007] A throttling refrigerator with precise temperature control, comprising:

[0008] A core shaft, with a finned tube heat exchanger provided on the outside and a valve needle provided on the inside. A refrigerator base is provided at one end of the core shaft, and gas flows into the finned tube heat exchanger through the refrigerator base. A refrigerator flange is provided at the other end of the core shaft, and a throttling block is provided on the refrigerator flange. The throttling block is coaxially installed with the valve needle.

[0009] A driving member is disposed in the core shaft, the driving member is connected to the valve needle through a transmission mechanism, and is used to drive the valve needle to move along the axial direction;

[0010] The transmission mechanism comprises:

[0011] a conversion unit, connected to the driving member and the valve needle, respectively, for converting the rotational motion of the driving member into linear motion of the valve needle;

[0012] An outer transmission sleeve is disposed in the core shaft, one end of which is fixedly connected to the driving member;

[0013] An inner transmission sleeve, one end of which is sleeved in the outer transmission sleeve and the other end of which is connected to the refrigerator flange, and the valve needle passes through the inner transmission sleeve;

[0014] The centering unit is arranged in the outer transmission sleeve and is located at one end where the inner transmission sleeve and the outer transmission sleeve are connected. The centering unit is located between the inner transmission sleeve and the outer transmission sleeve and is used to center the inner transmission sleeve and reduce heat conduction between the inner transmission sleeve and the outer transmission sleeve.

[0015] Furthermore, the centering unit includes:

[0016] A limiting ring is provided in the outer transmission sleeve and is used to limit the length of the inner transmission sleeve inserted into the outer transmission sleeve;

[0017] The centering ring is arranged in the outer transmission sleeve, and the inner hole diameter of the centering ring is adapted to the outer diameter of the insertion end of the inner transmission sleeve; the centering ring and the limiting ring are both hollow rings.

[0018] Furthermore, the centering ring and the limiting ring are both multi-petal structures, with the petals spaced 60° apart.

[0019] Furthermore, the centering unit further includes:

[0020] A centering block is provided in the inner transmission sleeve, and the valve needle extends outward after passing through the centering block;

[0021] The leaf spring is located on the side of the centering block close to the cooler flange.

[0022] Furthermore, the conversion unit includes:

[0023] An internal threaded sleeve, fixedly connected to the output shaft of the driving member, and provided with an external thread;

[0024] An external screw sleeve is provided with an internal thread, the external screw sleeve is threadedly connected to the internal screw sleeve, and the external screw sleeve is connected to the valve needle through a transmission rod;

[0025] A spring is arranged in the inner transmission sleeve, and the spring presses on the end surface of the outer screw sleeve.

[0026] Furthermore, a limiting waist hole is provided on the outer transmission sleeve, and a limiting rod is provided on the outer screw sleeve, and the limiting rod is located in the limiting waist hole.

[0027] Furthermore, the transmission rod is a hollow thin-walled tube.

[0028] Furthermore, the refrigerator flange is provided with an elastic slot, and the elastic slot is provided with a throttle block fixing hole for installing the throttle block; the refrigerator flange is also provided with an observation hole, a heat exchanger fixing slot and a working medium exhaust hole, and the heat exchanger fixing slot is used to connect with the fin tube heat exchanger.

[0029] Furthermore, the driving part is connected to the refrigerator base through a motor sleeve, and a bottom exhaust hole and a wire outlet hole are provided on the refrigerator base. The wire of the driving part is led out from the wire outlet hole, and the wire outlet hole is sealed with insulating sealant; the bottom exhaust hole is used to exhaust air.

[0030] Furthermore, the diameter of the bottom exhaust hole is less than 0.2 mm.

[0031] Compared with the prior art, the working principle and beneficial effects of the present invention are as follows:

[0032] (1) The precise temperature-controlled throttling refrigerator of the present invention adopts a transmission mechanism to convert the angular displacement of the motor into a linear displacement, thereby realizing high-precision control of the throttling hole opening. The refrigerator can operate in the liquid phase region and the gas phase region of the working medium. When operating in the gas phase region, the refrigerator can achieve a refrigeration temperature of 100K-150K or above and a high temperature control accuracy.

[0033] (2) The use of limiting rings, centering rings, hollow thin-walled transmission rods and other measures isolates the influence of low temperature on the motor, so that the motor can still work normally after the refrigerator reaches the low temperature operating temperature.

[0034] (3) The exhaust hole at the bottom of the refrigerator base allows a small amount of refrigerant to flow through the motor to exhaust the air inside the refrigerator, thereby avoiding the occurrence of condensed water and causing the motor to short-circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a structural diagram of an existing bellows self-regulating throttling refrigerator;

[0036] Figure 2 A schematic structural diagram of the throttling refrigerator with precise temperature control in Example 1;

[0037] Figure 3 A schematic structural diagram of the transmission mechanism in Example 1;

[0038] Figure 4 A schematic structural diagram of the outer transmission sleeve in Example 1;

[0039] Figure 5 Schematic diagram of the structure of the refrigerator flange in Example 1.

[0040] Reference numerals:

[0041] 2-refrigerator base; 21-wire outlet hole; 22-bottom exhaust hole; 3-core shaft; 4-finned tube heat exchanger; 5-valve needle; 6-refrigerator flange; 61-secondary observation hole; 62-main observation hole; 63-working fluid exhaust hole; 64-throttle block fixing hole; 65-heat exchanger fixing groove; 66-elastic slot; 7-micro stepper motor; 71-motor sleeve; 72-transmission rod; 81-outer transmission sleeve; 811-limit waist hole; 82-inner transmission sleeve; 83-inner screw sleeve; 84-outer screw sleeve; 841-limit rod; 85-spring; 86-centering block; 87-leaf spring; 88-limiting ring; 89-centering ring; 9-throttle block. DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below through specific embodiments with reference to the accompanying drawings.

[0043] Example 1

[0044] like Figure 2 As shown, the present invention provides a throttling refrigerator with precise temperature control, comprising: a refrigerator base 2, a core shaft 3, a finned tube heat exchanger 4, a refrigerator flange 6, a valve needle 5, a transmission mechanism, a driving member (a micro-stepping motor 7 in this embodiment), and a throttling block 9. The refrigerator base 2 and the refrigerator flange 6 are respectively arranged at both ends of the core shaft 3, and the pin holes on the refrigerator base 2 are aligned with the pin holes on the core shaft 3 and fixed using pins. The finned tube heat exchanger 4 is wound around the core shaft 3 and welded to the refrigerator base 2. The finned tube heat exchanger 4 is welded to the throttling block 9 and bent and placed in the heat exchanger fixing groove 65 in the refrigerator flange 6 and fixed using soldering.

[0045] like Figure 3As shown, the transmission mechanism includes: a conversion unit, an outer transmission sleeve 81, an inner transmission sleeve 82 and a centering unit. One end of the outer transmission sleeve 81 is connected to the front end of the micro-stepping motor 7 through a thread, and the other end is connected to the inner transmission sleeve 82. The insertion end of the outer transmission sleeve 81 is provided with a chamfer to facilitate the insertion of the inner transmission sleeve 82. The diameter of the through hole of the outer transmission sleeve 81 is larger than the outer diameter of the insertion end of the inner transmission sleeve 82. Figure 4 As shown, a limit ring 88 is positioned within the outer transmission sleeve 81. The inner diameter of the limit ring 88 is slightly smaller than the outer diameter of the insertion end of the inner transmission sleeve 82 to limit its position. The inner transmission sleeve 82 is connected to the core shaft 3 via a pin. The micro-stepping motor 7 is connected to the valve needle 5 via a conversion unit and a transmission rod 72. The conversion unit converts the angular displacement of the micro-stepping motor 7 into linear displacement. The transmission rod 72 drives the valve needle 5 to slide along the axial direction of the refrigerator, adjusting the throttle opening of the throttle block 9 to increase or decrease the cooling capacity and thereby control the cooling temperature.

[0046] The conversion unit comprises an inner screw sleeve 83 and an outer screw sleeve 84. The inner screw sleeve 83 is fixed to the main shaft of the micro-stepping motor 7. One end of the outer screw sleeve 84 is threadedly connected to the inner screw sleeve 83, and the other end is connected to the transmission rod 72. A spring 85 is provided in the inner transmission sleeve 82, and the spring 85 presses on the end face of the outer screw sleeve 84. The outer transmission sleeve 81 is provided with a limiting waist hole 811, and a limiting rod 841 is provided on the outer screw sleeve 84. The limiting rod 841 is located in the limiting waist hole 811. When the micro-stepping motor 7 rotates, the outer screw sleeve 84 cannot continue to rotate because the limiting rod 841 therein contacts the limiting waist hole 811, and the inner screw sleeve 83 then continues to rotate. At this moment, the angular displacement of the outer screw sleeve 84 will be converted into linear displacement. The limiting rod 841 slides along the axial direction of the refrigerator in the limiting waist hole 811, driving the transmission rod 72 and the valve needle 5 to move. The rotation angle control of the micro-stepping motor 7 is very precise. For example, if one circle is divided into 360 steps and the pitch of the inner screw sleeve 83 and the outer screw sleeve 84 is 0.2 mm, then one rotation of the micro-stepping motor 7 will cause the valve needle 5 to advance or retreat 0.2 / 360=0.56 μm. Therefore, the opening of the throttle hole, the flow rate of the refrigerator and the cooling temperature can be controlled very precisely.

[0047] The centering unit includes a centering ring 89 and a centering block 86. Centering block 86 is positioned within inner transmission sleeve 82, through which transmission rod 72 passes. Centering ring 89 is positioned within outer transmission sleeve 81. The inner diameter of centering ring 89 precisely matches the outer diameter of the insertion end of inner transmission sleeve 83 to ensure proper alignment of the cooler's moving and limiting components. A leaf spring 87 is provided on outer transmission sleeve 81 to eliminate vibration of valve needle 5 caused by airflow during cooler operation.

[0048] Specifically, if Figure 4As shown, both the limiting ring 88 and the centering ring 89 are hollow structures. They only adopt a multi-petal structure with a 60° interval between the petals. While achieving the limiting and centering functions, they can significantly reduce the contact area between the outer transmission sleeve 81 and the inner transmission sleeve 82. When the refrigerator is operating, the inner transmission sleeve 82 and the refrigerator flange 6 will be cooled to a low temperature of approximately -173°C. The limiting ring 88 and the centering ring 89 can greatly reduce the heat conduction area and the temperature change of the outer transmission sleeve 81 and the micro-stepping motor 7, ensuring that the micro-stepping motor 7 can maintain a normal operating temperature range of approximately 10°C when the refrigerator reaches an operating temperature of approximately -173°C. Physical isolation between the low-temperature end and the normal-temperature end is achieved within the axial dimension of the refrigerator length of approximately 20 mm. In addition, the transmission rod 72 is a hollow thin-walled tube, and the hollow structure reduces heat conduction.

[0049] The refrigerator base 2 is provided with a bottom exhaust hole 22 and a wire outlet hole 21. The wires of the micro-stepping motor 7 are led out from the wire outlet hole 21 and the wire outlet hole 21 is sealed with insulating sealant. The aperture of the bottom exhaust hole 22 is less than 0.2 mm.

[0050] Further, if Figure 5 As shown, the cooler flange 6 is provided with a secondary observation hole 61, a main observation hole 62, a working medium exhaust hole 63, a throttle block fixing hole 64, a heat exchanger fixing groove 65, and an elastic slot 66. The main observation hole 62 and the secondary observation hole 61 are used to observe whether the valve needle 5 has entered the throttle hole of the throttle block 9. The throttle block fixing hole 64 is used to fix the throttle block 9. The throttle block 9 is installed on the cooler flange 6 through the throttle block fixing hole 64. The cooler flange 6 is then appropriately squeezed to deform due to the elastic slot 66 and placed into the inner transmission sleeve 82. The external force is released to allow the cooler flange 6 to rebound, forming an interference fit.

[0051] Specifically, the assembly process of the refrigerator is as follows:

[0052] At first transmission rod 72 is welded with valve pin 5 and outer screw sleeve 84 respectively, inner screw sleeve 83 is bonded with the main shaft of micro-stepping motor 7, the inner screw sleeve 83 that will bond is screwed in the outer screw sleeve 84.Outer transmission sleeve 81 is linked to each other with the front end of micro-stepping motor 7 by screw thread, again limiting rod 841 is inserted in the hole of outer screw sleeve 84 by limiting waist hole 811, motor cover 71 is sleeved into micro-stepping motor 7 bottoms to protect motor in assembly process, then it is packed into refrigerator base 2, the wire of micro-stepping motor 7 is drawn from wire outlet 21, and uses insulating sealant to seal wire outlet 21 to avoid working medium gas to flow out from here, so far the moving part of accurate temperature control throttling refrigerator has assembled.Centering block 86, leaf spring 87 and spring 85 are put into interior transmission sleeve 82. The throttle block 9 is installed on the refrigerator flange 6 through the throttle block fixing hole 64, and then the refrigerator flange 6 is appropriately squeezed so that it is deformed due to the elastic slot 66, and placed in the inner transmission sleeve 82. The external force is released to make the refrigerator flange 6 rebound to form an interference fit. Thereafter, the inner transmission sleeve 82 is fixed to the core shaft 3 using a pin. At this point, the limiting part of the precise temperature control throttling refrigerator is installed. The outer transmission sleeve 81 of the refrigerator moving part is inserted into the inner transmission sleeve 82 of the limiting part from the rear end. The inner hole diameter of the limiting ring 88 is slightly lower than the outer diameter of the insertion end of the inner transmission sleeve 82 to limit it. A centering ring 89 is provided. The inner hole diameter of the centering ring 89 is precisely matched with the outer diameter of the insertion end of the inner transmission sleeve 82 to ensure the alignment of the refrigerator moving part and the limiting part. During the assembly of the moving and limiting parts of the refrigerator, the transmission rod 72 and the valve needle 5 pass through the spring 85, the centering block 86, and the leaf spring 87, so that the spring 85 is pressed against the end face of the outer screw sleeve 84. The centering block 86 and the leaf spring 87 assist the transmission rod 72 in centering the valve needle 5 and the throttle block 9. The spring 85 is compressed downward until the inner transmission sleeve 82 contacts the limiting ring 88. At this time, the pin hole on the refrigerator base 2 is aligned with the pin hole on the core shaft 3 and fixed with a pin. The finned tube heat exchanger 4 is welded to the throttle block 9 and bent and placed in the heat exchanger fixing groove 55 in the refrigerator flange 6 and fixed with tin soldering. After the heat exchanger is fixed, the finned tube heat exchanger 4 is wound along the core shaft 3 and welded to the refrigerator base 2 after winding. The assembly of the precise temperature control and throttling refrigerator is completed.

[0053] The working and temperature regulation process of the throttling cooler is as follows:

[0054] Before the refrigerator starts working, the micro-stepping motor 7 is driven to rotate the inner screw sleeve 83 and the outer screw sleeve 84. The outer screw sleeve 84 cannot continue to rotate because the limit rod 841 therein contacts the limit waist hole 811, while the inner screw sleeve 83 continues to rotate. At this time, the angular displacement of the outer screw sleeve 84 will be converted into linear displacement. The limit rod 841 slides along the axial direction of the refrigerator in the limit waist hole 811, driving the transmission rod 72 and the valve needle 5 to move. The micro-stepping motor 7 is driven to move the valve needle 5 in the direction of the throttle block 9. The valve needle 5 is confirmed to have entered the throttle hole of the throttle block 9 through the main observation hole 62 and the secondary observation hole 61, and the current in the micro-stepping motor 7 is continuously monitored. When the current increases significantly, it indicates that the motor is blocked. The valve needle 5 is in full contact with the throttle hole in the throttle block 9, and the throttle hole is completely closed. At this moment, the movement distance of the valve needle after the micro-stepping motor 7 rotates one circle is the pitch of the inner screw sleeve 83 and the outer screw sleeve 84. The spring 85 will prevent the valve needle 5 from bonding with the throttle hole to ensure continuous movement. The leaf spring 7 will eliminate the valve needle vibration caused by the airflow during the operation of the refrigerator. After the throttle hole is completely closed, the micro-stepping motor 7 is reversely driven to open the throttle hole and record the number of motor movement steps. At this moment, the throttle hole aperture is fully controllable. Open the high-pressure gas source, gas flows into the finned tube heat exchanger 4 inside through the refrigerator base 2, and the throttle hole ejected by the throttle block 9 produces cooling capacity. The low-temperature working medium flows out through the working medium exhaust hole 63, exchanges heat with the fins outside the finned tube heat exchanger 4 and precools the air intake, so that the refrigeration temperature is continuously reduced. The throttle hole aperture can be adjusted at any time during the operation of the refrigerator to increase or reduce the cooling capacity and control the refrigeration temperature with this.

[0055] The above examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. Those skilled in the art can make several simple deductions, modifications or substitutions based on the concept of the present invention.

Claims

1. A throttling refrigerator with precise temperature control, characterized in that: include: A core shaft (3) is provided with a finned tube heat exchanger (4) on the outside and a valve needle (5) on the inside. A refrigerator base (2) is provided at one end of the core shaft (3), and gas flows into the interior of the finned tube heat exchanger (4) through the refrigerator base (2). A refrigerator flange (6) is provided at the other end of the core shaft (3). A throttling block (9) is provided on the refrigerator flange (6), and the throttling block (9) is coaxially installed with the valve needle (5). A driving member is arranged in the core shaft (3), the driving member is connected to the valve needle (5) through a transmission mechanism, and is used to drive the valve needle (5) to move along the axial direction; The transmission mechanism comprises: a conversion unit, connected to the driving member and the valve needle (5) respectively, for converting the rotational motion of the driving member into the linear motion of the valve needle (5); An outer transmission sleeve (81) is disposed in the core shaft (3), one end of which is fixedly connected to the driving member; An inner transmission sleeve (82), one end of which is sleeved in the outer transmission sleeve (81) and the other end of which is connected to the refrigerator flange (6); the valve needle (5) passes through the inner transmission sleeve (82); A centering unit is provided in the outer transmission sleeve (81) and is located at one end where the inner transmission sleeve (82) and the outer transmission sleeve (81) are connected. The centering unit is located between the inner transmission sleeve (82) and the outer transmission sleeve (81) and is used for centering the inner transmission sleeve (82) and reducing heat conduction between the inner transmission sleeve (82) and the outer transmission sleeve (81).

2. The throttling refrigerator with precise temperature control according to claim 1, characterized in that: The centering unit comprises: A limiting ring (88) is provided in the outer transmission sleeve (81) and is used to limit the length of the inner transmission sleeve (82) inserted into the outer transmission sleeve (81); A centering ring (89) is arranged in the outer transmission sleeve (81), and the inner hole diameter of the centering ring (89) is adapted to the outer diameter of the insertion end of the inner transmission sleeve (82); the centering ring (89) and the limiting ring (88) are both hollow rings.

3. The throttling refrigerator with precise temperature control according to claim 2, characterized in that: The centering ring (89) and the limiting ring (88) are both multi-petal structures.

4. The throttling refrigerator with precise temperature control according to claim 2, characterized in that: The centering unit further comprises: A centering block (86) is disposed in the inner transmission sleeve (82), and the valve needle (5) extends outward after passing through the centering block (86); The leaf spring (87) is located on a side of the centering block (86) close to the refrigerator flange (6).

5. The throttling refrigerator with precise temperature control according to claim 2, characterized in that: The conversion unit includes: An internal threaded sleeve (83) is fixedly connected to the output shaft of the driving member and is provided with an external thread; An outer threaded sleeve (84) is provided with an inner thread, the outer threaded sleeve (84) is threadedly connected to the inner threaded sleeve (83), and the outer threaded sleeve (84) is connected to the valve needle (5) through a transmission rod (72); A spring (85) is provided in the inner transmission sleeve (82), and the spring (85) presses on the end surface of the outer screw sleeve (84).

6. The throttling refrigerator with precise temperature control according to claim 5, characterized in that: The outer transmission sleeve (81) is provided with a limiting waist hole (811), and the outer screw sleeve (84) is provided with a limiting rod (841), and the limiting rod (841) is located in the limiting waist hole (811).

7. The throttling refrigerator with precise temperature control according to claim 5, characterized in that: The transmission rod (72) is a hollow thin-walled tube.

8. The throttling refrigerator with precise temperature control according to claim 1, characterized in that: The refrigerator flange (6) is provided with an elastic slot (66), and a throttle block fixing hole (64) for installing a throttle block (9) is provided on the elastic slot (66); the refrigerator flange (6) is also provided with an observation hole, a heat exchanger fixing slot (65) and a working medium exhaust hole (63), and the heat exchanger fixing slot (65) is used to connect with the fin tube heat exchanger (4).

9. The throttling refrigerator with precise temperature control according to claim 1, characterized in that: The driving member is connected to the refrigerator base (2) through a motor sleeve (71); a bottom exhaust hole (22) and a wire outlet hole (21) are provided on the refrigerator base (2); the wire of the driving member is led out from the wire outlet hole (21), and the wire outlet hole (21) is sealed with insulating sealant; the bottom exhaust hole (22) is used to exhaust air.

10. The throttling refrigerator with precise temperature control according to claim 9, characterized in that: The bottom exhaust hole (22) has a diameter of less than 0.2 mm.

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