Stirling refrigerator with opening in upper end

Abstract

The utility model relates to the field of Stirling refrigeration, in particular to a Stirling cryocooler with an opening in the upper end, which comprises a first shell, a second shell, a third shell and a fourth shell. The cover plate is detachably connected with the first shell and is used for opening / closing the upper opening; the driving assembly is mounted in the first shell through the upper opening and is connected with the inner wall surface of the first shell; the rotor assembly and the stator assembly form the motor, the stator assembly is installed in the first shell, and the rotor assembly is inserted into the stator assembly; the eccentric shaft penetrates through the rotor assembly; and the load element is connected with the eccentric shaft through a transmission piece. According to the utility model, the driving assembly can be taken and placed through the upper opening so as to prevent the bonding wire from being bent, broken or damaged, and electromagnetic noise caused by stator eccentricity can be reduced at the same time.

Description

Technical Field

[0001] The utility model relates to the field of refrigeration equipment, in particular to a Stirling refrigerator with an upper end opening. Background Art

[0002] In the existing rotary Stirling refrigerator structural design, it is usually necessary to set the motor drive control element in a closed shell. For example, in the patent application with application number 201611125637.9 and patent name "A Rotary Integrated Stirling Refrigerator", the motor drive controller is set in the first shell. The defect brought about by this structural design is that the control element can only be installed in the shell in advance. If the control element needs to be connected with other components later, the wiring space of the line is small, and the welding wire may need to be bent, resulting in bending, breaking or damage of the welding wire. At the same time, once the control element (such as a circuit board, etc.) in the shell is damaged, it is not easy to remove it from the shell for inspection and replacement.

[0003] Meanwhile, in the prior art, components such as pressure rings and clamping rings are often used to clamp stator components or control elements, etc. However, pressure rings and clamping rings are prone to loosening, further causing the positions of the components fixed by them to change, thereby generating vibration noise. Utility Model Content

[0004] The utility model aims to provide a Stirling refrigerator with an upper opening, which can take and place a driving component through the upper opening to avoid bending, breaking or damage of welding wires, and can reduce electromagnetic noise caused by stator eccentricity.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A Stirling refrigerator with an upper end opening is provided, comprising:

[0007] A first housing having an upper opening;

[0008] a cover plate, which is detachably connected to the first shell and is used to open / close the upper opening;

[0009] A driving assembly, which is installed inside the first shell through the upper opening and connected to the inner wall surface of the first shell;

[0010] A rotor assembly and a stator assembly constitute the motor, wherein the stator assembly is installed in the first housing, and the rotor assembly is inserted into the stator assembly;

[0011] An eccentric shaft, which passes through the rotor assembly;

[0012] and a load element connected to the eccentric shaft via a transmission member.

[0013] Preferably, the Stirling refrigerator further comprises: a rotor cover, which is hollow inside and connected to the first shell via fasteners, and the rotor assembly is installed inside the rotor cover.

[0014] Preferably, the fastener passes through the rotor cover and the first shell in the radial direction.

[0015] Preferably, the surface of the driving component is covered with a heat conducting member.

[0016] Preferably, the Stirling refrigerator further comprises: a positioning member, which is connected to the first housing and / or the rotor cover and extends in the axial direction.

[0017] Preferably, the Stirling refrigerator further comprises: a connector, which is connected to the first housing and is also electrically connected to the drive assembly;

[0018] and a grounding member connected to the connector for grounding.

[0019] Preferably, the gap between the stator assembly and the first housing is 0-0.05 mm, and the two are glued and fixed.

[0020] Preferably, the driving component includes: a power supply board and a driving board, both of which are arranged inside the first shell, and the power supply board is electrically connected to the driving board to supply power to the driving board, and the driving board is connected to the stator component to adjust the current size and current direction of the stator component coil.

[0021] Preferably, the Stirling refrigerator further comprises: a second shell, which is sealed and connected to the rotor cover, and the bottom of the eccentric shaft is accommodated in the second shell.

[0022] Preferably, the upper portion of the eccentric shaft is installed inside the rotor cover through a first bearing, and the bottom portion is installed inside the second shell through a second bearing.

[0023] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0024] The Stirling refrigerator in the utility model only needs to open an upper opening on the casing, and the drive component can be taken in and out through the upper opening, so that the placement of the welding wire is more flexible, and the bending, breaking or damage of the welding wire can be avoided. At the same time, the matching of the stator assembly and the casing is changed from parts such as a clamping ring to a small gap matching, thereby reducing the vibration caused by the movement of the stator when the whole machine is running, and reducing the electromagnetic noise caused by the stator eccentricity. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a cross-sectional view of a Stirling refrigerator with an opening at the upper end in the utility model. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0027] Example 1

[0028] like Figure 1 As shown, this embodiment provides a Stirling refrigerator with an upper end opening, which includes:

[0029] The first shell 5 is hollow inside and has an upper opening 51;

[0030] A cover plate 1, which is detachably connected to the first housing 5 by means of a first fastener 2 (such as a screw / bolt, etc.) and is used to open / close the upper opening 51;

[0031] The driving assembly is installed inside the first housing 5 through the upper opening 51 and is detachably connected to the inner wall of the first housing 5 by means of screws / bolts, etc., which has a better fixing effect than the existing compression ring clamping method;

[0032] The rotor cover 9 is hollow inside and connected to the first housing 5 via a second fastener 8 (such as a screw / bolt, etc.);

[0033] A rotor assembly 7, which is installed inside the rotor cover 9;

[0034] The stator assembly 6 is installed inside the first housing 5 and sleeved on the periphery of the rotor assembly 7. At the same time, the stator assembly 6 is fixed to the inner wall surface of the first housing 5 by means of adhesive connection or the like. The gap between the stator assembly 6 and the first housing 5 is 0-0.05 mm.

[0035] An eccentric shaft 12 is arranged through the rotor assembly 7, and the upper part is accommodated in the interior of the rotor cover 9; in this embodiment, the rotor assembly 7, the stator assembly 6, and the rotating shaft 12 are coaxially arranged;

[0036] A second housing 10, which is used to accommodate the bottom of the eccentric shaft 12 and is sealed and connected to the rotor cover 9; preferably, in this embodiment, the upper part of the eccentric shaft 12 is installed inside the rotor cover 9 through a first bearing 121, and the bottom is installed inside the second housing 10 through a second bearing 122;

[0037] and a load element 11, which is connected to the eccentric shaft 12 through a transmission member such as a bearing and is accommodated in the second housing 10. In this embodiment, the load element 11 includes a compression component and / or an expansion component;

[0038] The stator assembly 6 and the rotor assembly 7 constitute a motor. Under the control of the driving assembly, the motor drives the eccentric shaft 12 and the load element 11 to reciprocate to compress the gas, thereby realizing the Stirling cycle to complete the alternating heat exchange and generate cold.

[0039] Specifically, the driving assembly in this embodiment includes: a power supply board 3 and a driving board 4 (such as a PCB circuit board, etc.), both of which are arranged inside the first shell 5 and are detachably connected by snap connection, clamping, screw / bolt connection, etc., wherein the power supply board 3 is electrically connected to the driving board 4 to supply power to the driving board 4, and at the same time, the driving board 4 is connected to the stator assembly 6 for adjusting the current size and current direction output by the coil of the stator assembly 6.

[0040] Therefore, in this embodiment, the upper end of the motor housing is opened (i.e., the upper opening of the first shell), and the drive assembly can be installed in the shell through the opening, so that the placement of the welding wire is more flexible and the bending of the welding wire can be avoided. When the drive assembly needs to be inspected and replaced, the drive assembly can be directly taken out through the opening. At the same time, the stator assembly, the drive assembly, etc. do not need to be tightened by a pressure ring or other structure, and the gap between the stator assembly and the first shell is extremely small, so the centering error of the stator and the movement during operation can be reduced, thereby reducing noise.

[0041] Embodiment 2:

[0042] The difference between this embodiment and embodiment 1 is that there are several fasteners 8, and all of them pass through the rotor cover 9 and the first housing 5 in the radial direction to prevent the two from moving relative to each other in the radial and axial directions. At the same time, the surface of the drive component is covered with a heat-conducting member, such as a heat-conducting silicone sheet, to dissipate heat from the components in time. For example, in this embodiment, the surface of the power board 3 and / or the drive board 4 is covered with a heat-conducting member.

[0043] Embodiment 3:

[0044] The difference between this embodiment and embodiment 1 or 2 is that the Stirling refrigerator further includes:

[0045] A positioning member 13 (such as a pin, etc.), which is connected to the first housing 5 and / or the rotor cover 9 and extends in the axial direction, and is used to achieve axial rapid positioning of the first housing 5 and the rotor cover 9 when the two are assembled, and to prevent relative rotation between the two;

[0046] A connector 15, which is connected to the first housing 5 and is also electrically connected to the drive assembly;

[0047] And a grounding member 14 connected to the connector 15 for grounding.

[0048] In summary, the improvement cost of the Stirling refrigerator in the present application is low. It only needs to open an upper opening on the casing, and the drive assembly can be taken out and placed through the upper opening, making the placement of the welding wire more flexible and avoiding bending, breaking or damage of the welding wire. At the same time, the fit between the stator assembly and the casing is changed from parts such as retaining rings to a small gap fit, thereby reducing the vibration caused by the movement of the stator when the whole machine is running, and further reducing the electromagnetic noise caused by the stator eccentricity.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit 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 Stirling refrigerator with an upper opening, characterized in that: include: A first housing having an upper opening; a cover plate, which is detachably connected to the first shell and is used to open / close the upper opening; A driving assembly, which is installed inside the first shell through the upper opening and connected to the inner wall surface of the first shell; A rotor assembly and a stator assembly constitute the motor, wherein the stator assembly is installed in the first housing, and the rotor assembly is inserted into the stator assembly; An eccentric shaft, which passes through the rotor assembly; and a load element connected to the eccentric shaft via a transmission member.

2. The Stirling refrigerator according to claim 1, characterized in that The Stirling refrigerator further comprises: a rotor cover, which is hollow inside and connected to the first shell through a fastener, and the rotor assembly is installed inside the rotor cover.

3. The Stirling refrigerator according to claim 2, characterized in that: The fastener passes through the rotor cover and the first shell in the radial direction.

4. The Stirling refrigerator according to claim 2, characterized in that: The surface of the driving component is covered with a heat conducting member.

5. The Stirling refrigerator according to claim 2, characterized in that: The Stirling refrigerator further comprises: a positioning member, which is connected to the first housing and / or the rotor cover and extends in the axial direction.

6. The Stirling refrigerator according to claim 1, characterized in that: The Stirling refrigerator further comprises: a connector, which is connected to the first housing and is also electrically connected to the drive assembly; and a grounding member connected to the connector for grounding.

7. The Stirling refrigerator according to claim 6, characterized in that The gap between the stator assembly and the first housing is 0-0.05 mm, and the two are glued and fixed.

8. The Stirling refrigerator according to claim 1, characterized in that: The driving component includes: a power board and a driving board, both of which are arranged inside the first shell, and the power board is electrically connected to the driving board to supply power to the driving board, and the driving board is connected to the stator component to adjust the current size and current direction of the stator component coil.

9. The Stirling refrigerator according to claim 2, characterized in that: The Stirling refrigerator further comprises: a second shell which is sealedly connected to the rotor cover, and the bottom of the eccentric shaft is accommodated in the second shell.

10. The Stirling refrigerator according to claim 9, characterized in that The upper portion of the eccentric shaft is installed inside the rotor cover through a first bearing, and the bottom portion of the eccentric shaft is installed inside the second housing through a second bearing.

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