A gas-proof structure

Abstract

The present invention discloses an anti-gas cross-flow structure, which relates to the technical field of pulse tube refrigerators, and includes: a pulse tube, a wire mesh layer, a flow guide core and a sleeve, wherein the sleeve is arranged between the pulse tube and the flow guide core, the flow guide core has a flow guide channel, the sleeve connects the flow guide channel and the pulse tube, the wire mesh layer is fixedly arranged in the pulse tube, the pulse tube is welded to the sleeve in the circumferential direction, the flow guide core is welded to the sleeve in the circumferential direction and welded to the pulse tube seat at the end face. The anti-gas cross-flow structure provided by the present invention can avoid malfunctions, has high reliability and better temperature adaptability.

Description

Technical Field

[0001] The invention relates to the technical field of pulse tube refrigerators, and in particular to a gas blowby prevention structure. Background Art

[0002] The pulse hot end in the cold finger of the coaxial pulse tube refrigerator has an anti-gassing structure composed of a pulse tube, a sleeve and a pulse tube seat, wherein the pulse tube and the sleeve, and the pulse tube seat and the sleeve are bonded and cured with epoxy glue. However, the use of epoxy glue for curing has the following problems: First, a wire mesh layer is provided in the sleeve, and the glue is easily squeezed out and blocks the mesh of the wire mesh layer, causing failure; Second, the glue easily absorbs water vapor, which is easy to release water vapor during operation and affect the cold storage device connected to the pulse tube, and the reliability is poor; Third, the pulse tube, sleeve and pulse tube seat are all made of metal, and the expansion coefficient of glue is large and different from that of metal. During the temperature change process, the expansion and contraction of the metal material and the glue are different, which easily leads to the failure of bonding and poor temperature adaptability. Therefore, there is an urgent need for an anti-gassing structure that can avoid failures, has high reliability and better temperature adaptability. Summary of the invention

[0003] The object of the present invention is to provide a gas blowby prevention structure to solve the problems existing in the above-mentioned prior art, to avoid failures, to have higher reliability and better temperature adaptability.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides an anti-gas blowby structure, comprising: a pulse tube, a wire mesh layer, a guide core and a sleeve, wherein the guide core is provided with a guide channel, the sleeve connects the guide channel and the pulse tube, the wire mesh layer is fixedly arranged in the pulse tube, the pulse tube is welded to the sleeve in the circumferential direction, and the guide core is welded to the sleeve in the circumferential direction.

[0006] Preferably, one end of the sleeve extends into the pulse tube, the portion of the sleeve extending out of the pulse tube is the first portion, the outer side surface of the first portion is flush with the outer side surface of the pulse tube, and the circumferential edge of one end of the pulse tube is welded to the circumferential edge of the first portion close to one end of the pulse tube.

[0007] Preferably, the guide core includes a first section, a second section and a third section, the second section is arranged between the first section and the third section, the two ends of the second section are fixedly connected to the first section and the second section respectively, the cross-sectional dimension of the first section in a direction perpendicular to the extension direction of the guide channel is smaller than that of the second section, the first section extends into the interior of the casing, the outer side wall of the first section contacts the inner side wall of the casing, and the circumferential edge of the second section close to one end of the casing forms a circumferential weld with the circumferential edge of the casing away from the end of the pulse tube.

[0008] Preferably, it also includes a vascular seat, which is sleeved and fixedly connected to the outside of the guide core.

[0009] Preferably, the cross-sectional dimension of the third section in the direction perpendicular to the extension direction of the guide channel is smaller than that of the second section, and the vascular seat is provided with a plug hole, the third section is inserted into the plug hole, the third section is fixedly connected to the vascular seat, and the end face of the second section close to the third section is in contact with the end face of one end of the vascular seat.

[0010] Preferably, one end of the third section away from the second section is end-welded to one end of the vascular seat away from the second section.

[0011] Preferably, the sleeve has an annular first limiting surface inside, the first section forms a second limiting surface close to the end surface of the sleeve, and both sides of the wire mesh layer are in contact with the first limiting surface and the second limiting surface respectively.

[0012] Preferably, the guide channel includes a first part and a second part, the first part is funnel-shaped, the large end of the first part is close to the wire mesh layer, and the small end of the first part is connected to and communicated with one end of the second part.

[0013] Preferably, the pulse tube, the guide core and the sleeve are coaxially arranged.

[0014] Preferably, the pulse tube, the guide core and the sleeve are all made of stainless steel or titanium alloy.

[0015] Compared with the prior art, the present invention has achieved the following technical effects:

[0016] The anti-gas cross-flow structure provided by the present invention has a pulse tube welded to the sleeve in the circumferential direction, and a guide core welded to the sleeve in the circumferential direction, which replaces the original adhesive fixation, avoids the clogging of the mesh by glue extrusion, and is not prone to malfunction; the welding position will not absorb and release water vapor, and has high reliability; welding is used for fixation, which avoids the different expansion and contraction amounts of glue and metal material when the temperature changes, and has better temperature adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A cross-sectional view of the anti-gas blowby structure provided by the present invention;

[0019] Figure 2 It is a cross-sectional view of a gas blowby prevention structure in the prior art;

[0020] In the figure: 1, pulse tube; 2, wire mesh layer; 3, guide core; 31, first section; 32, second section; 33, third section; 34, guide channel; 35, second limiting surface; 4, casing; 41, first limiting surface; 5, pulse tube seat, 6-original pulse tube; 7, original casing; 8, original pulse tube seat; 9, original wire mesh layer. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The object of the present invention is to provide a gas blowby prevention structure to solve the problems existing in the above-mentioned prior art, to avoid failures, to have higher reliability and better temperature adaptability.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 2 As shown, in an anti-gas blowby structure known to the inventor, the side of the original pulse tube 6 is glued and fixed to the original sleeve 7, the side of the original pulse tube seat 8 is glued and fixed to the side of the original sleeve 7, and the original wire mesh layer 9 is arranged in the original sleeve 7 and located between the original pulse tube 6 and the original pulse tube seat 8.

[0025] The present invention provides a gas blowby prevention structure, such as Figure 1As shown, it includes: a pulse tube 1, a wire mesh layer 2, a guide core 3 and a sleeve 4, the sleeve 4 is connected to one end of the pulse tube 1 and the guide core 3 respectively, the guide core 3 has a guide channel 34, the sleeve 4 connects the guide channel 34 and the pulse tube 1, the wire mesh layer 2 is fixedly arranged in the pulse tube 1, the pulse tube 1 is welded to the sleeve 4 in the circumferential direction, and the guide core 3 is welded to the sleeve 4 in the circumferential direction.

[0026] In the anti-gas cross-flow structure provided by the present invention, the pulse tube 1 is welded to the sleeve 4 in the circumferential direction, and the guide core 3 is welded to the sleeve 4 in the circumferential direction, which replaces the original adhesive fixation, avoids the glue from squeezing out to block the mesh of the wire mesh layer 2, and is not easy to cause malfunctions; the welding position will not absorb and release water vapor, and the reliability is higher; the use of welding for fixation avoids the difference in the amount of expansion and contraction between the glue and the metal material when the temperature changes, and has better temperature adaptability.

[0027] In a preferred implementation of this embodiment, one end of the sleeve 4 extends into the pulse tube 1, and the portion of the sleeve 4 extending out of the pulse tube 1 is the first portion, the outer side surface of the first portion is flush with the outer side surface of the pulse tube 1, and the circumferential edge of one end of the pulse tube 1 is welded to the circumferential edge of the first portion close to one end of the pulse tube 1. By welding the circumferential edge of the sleeve to the circumferential edge of the pulse tube 1, the reliability of the connection is stronger and the anti-blowby effect is better.

[0028] In a preferred implementation of the present embodiment, the flow guide core 3 includes a first section 31, a second section 32 and a third section 33. The second section 32 is disposed between the first section 31 and the third section 33. The two ends of the second section 32 are fixedly connected to the first section 31 and the second section 32 respectively. The cross-sectional dimension of the first section 31 in the direction perpendicular to the extension direction of the flow guide channel 34 is smaller than that of the second section 32. The first section 31 extends into the interior of the sleeve 4. The outer wall of the first section 31 contacts the inner wall of the sleeve 4. The circumferential edge of the second section 32 close to one end of the first section 31 forms a circumferential weld with the circumferential edge of the sleeve 4 away from the pulse tube 1. By contacting the outer wall of the first section 31 with the inner wall of the sleeve 4, and forming a circumferential weld with the circumferential edge of the second section 32 close to one end of the first section 31 and one end of the sleeve 4, it is difficult for gas to leak from between the flow guide core 3 and the sleeve 4, thereby improving the anti-blow-up capability.

[0029] In order to further improve the anti-gas blowby effect, in a preferred implementation manner of this embodiment, a vascular seat 5 is further included, and the vascular seat 5 is sleeved outside the guide core 3.

[0030] In a preferred implementation of this embodiment, the cross-sectional dimension of the third section 33 in the direction perpendicular to the extension direction of the flow guide channel 34 is smaller than that of the second section 32. The vascular seat is provided with a plug hole, and the third section 33 is inserted into the plug hole. The third section 33 is fixedly connected to the vascular seat 5, and the end surface of the second section 32 close to the third section 33 contacts the end surface of one end of the vascular seat 5. By fixing the third section 33 to the vascular seat 5, the reliability of the connection between the vascular seat 5 and the pulse tube 1 is further improved.

[0031] In order to further improve the sealing performance and anti-gas blowby capability between the vascular seat 5 and the flow guide core 3, in a preferred implementation of the present embodiment, an end of the third section 33 away from the second section 32 is welded to an end of the vascular seat 5 away from the second section 32. The end welding between the third section 33 and the vascular seat 5 refers to the welding of the circumferential edge of the end of the third section 33 away from the second section 32 and the circumferential edge of the end of the vascular seat 5 away from the second section 32.

[0032] It should be noted that the third section 33 and the vascular seat 5 can be fixed by various connection methods such as gluing, welding, and snap connection.

[0033] In a preferred implementation of this embodiment, the sleeve 4 has an annular first limiting surface 41, the first section 31 forms a second limiting surface 35 near the end surface of the sleeve 4, and the two sides of the wire mesh layer 2 are respectively in contact with the first limiting surface 41 and the second limiting surface 35. The wire mesh layer 2 is limited by the first limiting surface 41 and the second limiting surface 35, thereby improving the stability of the wire mesh layer 2. The wire mesh layer 2 is formed by stacking a plurality of wire meshes.

[0034] In a preferred implementation of this embodiment, the guide channel 34 includes a first part and a second part, the first part is funnel-shaped, the large end of the first part is close to the wire mesh layer 2, and the small end of the first part is connected and communicated with one end of the second part. The funnel-shaped first part can facilitate the gas to pass into the guide channel 34.

[0035] In a preferred implementation manner of this embodiment, the pulse tube 1, the guide core 3 and the sleeve 4 are coaxially arranged.

[0036] In a preferred implementation of this embodiment, the pulse tube 1, the flow guide core 3 and the sleeve 4 are all made of stainless steel or titanium alloy. Stainless steel and titanium alloy are relatively strong and have strong temperature adaptability. Among them, the first section 31, the second section 32 and the third section 33 of the flow guide core 3 are made of stainless steel in one piece.

[0037] It should be noted that, in addition to the above-mentioned stainless steel and titanium alloy, the materials of the pulse tube 1 , the guide core 3 and the sleeve 4 may also be other metal materials with similar functions, such as steel or other alloys.

[0038] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A gas blowby prevention structure, characterized in that: include: A pulse tube, a wire mesh layer, a guide core and a sleeve, wherein the guide core has a guide channel, the sleeve connects the guide channel and the pulse tube, the wire mesh layer is fixedly arranged in the pulse tube, the pulse tube is welded to the sleeve in the circumferential direction, and the guide core is welded to the sleeve in the circumferential direction.

2. The anti-gas blowby structure according to claim 1, characterized in that: One end of the sleeve extends into the pulse tube, and the portion of the sleeve extending out of the pulse tube is the first portion. The outer side surface of the first portion is flush with the outer side surface of the pulse tube, and the circumferential edge of one end of the pulse tube is welded to the circumferential edge of the first portion close to one end of the pulse tube.

3. The anti-gas blowby structure according to claim 1, characterized in that: The guide core includes a first section, a second section and a third section, the second section is arranged between the first section and the third section, two ends of the second section are fixedly connected to the first section and the second section respectively, the cross-sectional dimension of the first section in a direction perpendicular to the extension direction of the guide channel is smaller than that of the second section, the first section extends into the interior of the casing, the outer side wall of the first section contacts the inner side wall of the casing, and a circumferential edge of the second section close to one end of the casing forms a circumferential weld with a circumferential edge of the casing away from one end of the pulse tube.

4. The anti-gas blowby structure according to claim 3, characterized in that: It also includes a vascular seat, which is sleeved outside the guide core.

5. The anti-gas blowby structure according to claim 4, characterized in that: The cross-sectional dimension of the third section in a direction perpendicular to the extension direction of the guide channel is smaller than that of the second section. The vascular seat is provided with an insertion hole, the third section is inserted into the insertion hole, the third section is fixedly connected to the vascular seat, and the end face of the second section close to the third section is in contact with the end face of one end of the vascular seat.

6. The anti-gas blowby structure according to claim 5, characterized in that: An end of the third section away from the second section is end-welded to an end of the vessel seat away from the second section.

7. The anti-gas blowby structure according to claim 3, characterized in that: The sleeve has an annular first limiting surface inside, the first section forms a second limiting surface close to the end surface of the sleeve, and both sides of the wire mesh layer are in contact with the first limiting surface and the second limiting surface respectively.

8. The anti-gas blowby structure according to claim 1, characterized in that: The guide channel includes a first part and a second part, the first part is funnel-shaped, the large end of the first part is close to the wire mesh layer, and the small end of the first part is connected and communicated with one end of the second part.

9. The anti-gas blowby structure according to claim 1, characterized in that: The pulse tube, the guide core and the sleeve are coaxially arranged.

10. The anti-gas blowby structure according to claim 1, characterized in that: The pulse tube, the guide core and the sleeve are all made of stainless steel or titanium alloy.

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