Vacuum high frequency induction welding device and method

Abstract

The present invention discloses a vacuum high-frequency induction welding device and method, the device comprises: a furnace body, a furnace cover, an instrument sealing device, an exhaust path and a high-frequency coil; the furnace cover covers the opening of the furnace body, and the furnace cover and the furnace body are sealed; when used for welding, the instrument passes through the furnace cover and the welding point of the instrument extends into the furnace body, and the instrument and the furnace cover are sealed by the instrument sealing device; one end of the exhaust path is connected to the furnace body, and is used to evacuate the furnace body; the coil section of the high-frequency coil is arranged in the furnace body, and is used to weld the welding point of the instrument by high-frequency induction. The method comprises welding the welding point of the instrument by using the device. Through the present invention, vacuum high-frequency welding is adopted, which is faster and more efficient, and local welding of parts can be performed. In addition, the furnace body adopts a minimized design, which greatly shortens the time consumed by welding and realizes efficient assembly line production.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum welding, and in particular to a vacuum high-frequency induction welding device and method. Background Art

[0002] Existing vacuum welding furnaces generally use the method of evacuating the furnace body and turning on electric heating for welding. This technology can evacuate the required space of the welding device, and then melt the solder by heating so that the solder blocks the vacuum exhaust port of the device, thereby achieving a long-term vacuum state in the space. High vacuum insulation technology is currently the best insulation technology. This technology is often used in the production of thermos cups and in the medical industry for the production of vacuum walls of cryoablation needles. Since the internal fluid temperature of the cryoablation needle reaches -130 to -196°C, if the needle shaft section is not vacuum insulated, the normal tissue on the needle track will also be frostbitten while the needle ablates the tumor. In addition, some cryoablation needle products also perform vacuum insulation on the handle section to prevent frostbite on the doctor's hands caused by low temperatures.

[0003] The existing vacuum electric heating welding furnace requires the entire welding device to be placed in the furnace body, and the entire device will be heated and annealed, making the entire device soft or reducing its toughness. Therefore, the vacuum electric heating welding furnace is not suitable for welding devices containing materials that are not resistant to high temperatures, nor is it suitable for welding devices containing parts that do not want to be annealed.

[0004] Cryoablation requires high hardness and toughness of the needle shaft. If the needle shaft is soft or has poor toughness, it is easy for the needle shaft to bend or even break during percutaneous puncture, especially when the punctured tissue or tumor is hard. The bending of the needle shaft will lead to inaccurate puncture, inability to puncture in place, and increased puncture times, which will bring inconvenience to the operation and the risk of bleeding transfer. The broken needle shaft will cause serious medical accidents, such as penetrating injuries, frostbite, gas embolism, etc. However, the existing cryoablation needle products all use vacuum electric heating welding furnaces to make vacuum walls. For specifications with thicker needle shafts and thicker walls, the rigidity and toughness of the needle shaft after welding are reduced, but they still meet clinical needs. However, for thinner and thinner needle shaft specifications, the use of vacuum electric heating welding will cause the needle shaft to lose the rigidity and toughness required for clinical use. However, cryoablation needles have always been developing towards a trend of thinner needle shafts and larger ice balls, so that the best treatment effect can be achieved with smaller incisions. Summary of the invention

[0005] In view of the problems existing in the above-mentioned prior art, the present invention proposes a vacuum high-frequency induction welding device and method. The vacuum high-frequency welding is faster and more efficient than the vacuum electric heating welding furnace, and can perform local welding of parts to avoid the damage of high temperature to other non-high-temperature resistant materials. In addition, only the coil segment of the high-frequency coil is placed in the furnace, and the furnace body adopts a minimized design, which greatly shortens the working hours consumed by vacuuming, thereby shortening the time consumed by welding, and realizing efficient assembly line production.

[0006] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0007] The present invention provides a vacuum high-frequency induction welding device and its application, which comprises: a furnace body, a furnace cover, an instrument sealing device, an exhaust path and a high-frequency coil; wherein:

[0008] The furnace cover covers the opening of the furnace body, and the furnace cover and the furnace body are sealed and connected;

[0009] When used for welding, the instrument passes through the furnace cover and the welding point of the instrument extends into the furnace body, and the instrument and the furnace cover are sealed by the instrument sealing device;

[0010] One end of the exhaust path is connected to the furnace body and is used to evacuate the furnace body;

[0011] The coil section of the high-frequency coil is arranged in the furnace body and is used to weld the welding points of the device by high-frequency induction.

[0012] Preferably, the instrument sealing device comprises: an instrument sealing ring and an instrument sealing cap; wherein,

[0013] The instrument sealing ring is arranged between the instrument sealing cap and the furnace cover. When used for welding, the instrument is inserted through the instrument sealing ring. The instrument sealing ring is used to seal between the instrument and the furnace cover when the instrument contacts the furnace cover and the instrument at the same time.

[0014] The instrument sealing cap is used to selectively tighten or loosen the sealing ring, wherein the instrument sealing ring contacts the instrument after tightening and does not contact the instrument after loosening.

[0015] Preferably, the vacuum valve body is used to be closed after welding is completed to cut off vacuum suction, and is also used to be opened for vacuum extraction during the next welding and after the sealing of the instrument sealing device is completed.

[0016] Preferably, the furnace cover comprises: a cover plate and an instrument channel for the instrument to pass through; wherein,

[0017] The cover plate covers the opening of the furnace body, and the cover plate is sealed and connected to the furnace body;

[0018] The inner diameter of the instrument channel is larger than the outer diameter of the instrument, and one end of the instrument channel is connected to the furnace body. The instrument channel is used to guide the instrument to be inserted into and removed from the furnace body, thereby preventing the instrument from directly contacting the instrument sealing ring and the high-frequency coil, and effectively protecting the instrument.

[0019] Preferably, it further comprises: a vacuum valve body, which is arranged on the instrument channel and located between the instrument sealing device and the high-frequency coil; the vacuum valve body is used to be closed after welding is completed, and is also used to be opened after the sealing of the instrument sealing device is completed during the next welding. When the vacuum valve body is arranged on the instrument channel, each vacuuming only needs to remove the air between the vacuum valve body and the instrument sealing device, which takes less time and is more efficient.

[0020] Preferably, the coil path is used to lead the high-frequency coil out of the furnace body.

[0021] Preferably, it also includes: a viewing window, wherein the viewing window is used to observe the welding condition of the vacuum high-frequency welding point.

[0022] Preferably, it further comprises: a temperature measuring device, wherein the temperature measuring device is used to monitor the temperature of the soldering point.

[0023] Preferably, it further comprises: a monitoring circuit, wherein the monitoring circuit is used to monitor the vacuum degree in the furnace body and / or the vacuum degree of the exhaust port of the exhaust circuit.

[0024] Preferably, the device is the vacuum wall of a cryoablation needle.

[0025] Preferably, the number of the instrument sealing device and the number of the high-frequency coil are both multiple;

[0026] The arrangement of the multiple instrument sealing devices on the furnace cover matches the arrangement of the multiple high-frequency coils in the furnace body, and the instrument sealing devices correspond to the high-frequency coils one by one, wherein the instrument sealed by the instrument sealing device can be welded by a corresponding high-frequency coil. This arrangement allows welding of multiple instruments at the same time, further improving production efficiency.

[0027] The present invention also provides a vacuum high-frequency induction welding method, which comprises: using the vacuum high-frequency welding device described above to weld the welding points of the device.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] (1) The vacuum high-frequency induction welding device and method provided by the present invention adopts vacuum high-frequency welding, which is faster and more efficient than vacuum electric heating welding furnaces, and can perform local welding of parts to avoid high temperature damage to other non-high temperature resistant materials;

[0030] (2) The vacuum high-frequency induction welding device and method provided by the present invention achieves a minimal furnace design by placing only the coil segment of the high-frequency coil in the furnace and only placing one end of the vacuum high-frequency welding point of the device in the furnace, thereby shortening the time required to evacuate the furnace and realizing efficient assembly line production;

[0031] (3) In the optional scheme of the vacuum high-frequency induction welding device and method provided by the present invention, through the cooperation between the instrument sealing ring and the vacuum valve body, local brazing of the vacuum wall is achieved without changing the original hardness and toughness of the needle rod, and the vacuum wall is further produced in a fast and efficient assembly line manner;

[0032] (4) In the optional scheme of the vacuum high-frequency induction welding device and method provided by the present invention, by setting the vacuum valve body on the instrument channel, each time the vacuum is drawn, it is only necessary to draw out the air between the vacuum valve body and the instrument sealing device, which takes less time and is more efficient.

[0033] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings:

[0035] Figure 1 A schematic diagram of a vacuum high frequency induction welding device according to a preferred embodiment of the present invention;

[0036] Figure 2 A schematic structural diagram of a vacuum high frequency induction welding device according to a preferred embodiment of the present invention;

[0037] Figure 3 for Figure 2 A top view of

[0038] Figure 4 for Figure 3 Sectional view in the AA direction;

[0039] Figure 5 A schematic diagram of a vacuum wall insertion process according to a preferred embodiment of the present invention;

[0040] Figure 6 A schematic diagram of the tightening process of a sealing device according to a preferred embodiment of the present invention;

[0041] Figure 7 A schematic diagram of the opening process of a vacuum valve body according to a preferred embodiment of the present invention;

[0042] Figure 8 A schematic diagram of a process of inserting a vacuum wall to the bottom according to a preferred embodiment of the present invention;

[0043] Fig. 9 A schematic structural diagram of a vacuum high frequency induction welding device according to another preferred embodiment of the present invention;

[0044] Fig.10 for Fig. 9 A top view of

[0045] Fig.11 for Fig.10 Cross-sectional view along the BB direction.

[0046] Explanation of reference numerals: 1-furnace body, 2-furnace cover, 3-instrument sealing cap, 4-instrument sealing ring, 5-high frequency coil, 6-instrument, 7-vacuum ionization gauge, 8-vacuum bellows, 9-vacuum window, 10-sealing ring, 11-vacuum valve body, 12-flange clamp, 13-caliper screw;

[0047] 101-air extraction circuit, 102-coil circuit, 103-window circuit, 104-monitoring circuit, 105-pad;

[0048] 21-cover plate, 22-instrument channel, 22'-upper section of the instrument channel;

[0049] 51-coil section, 52-straight section, 53-coil flange joint;

[0050] 61 - inner tube, 62 - outer tube, 63 - needle rod, 64 - vacuum high frequency welding point, 65 - upper end welding point, 66 - middle welding point. DETAILED DESCRIPTION

[0051] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiment.

[0052] The vacuum high-frequency induction welding device of the embodiment of the present invention comprises: a furnace body 1, a furnace cover 2, an instrument sealing device, an exhaust path 101 and a high-frequency coil 5. Among them, the furnace cover 2 covers the opening of the furnace body 1, and the furnace cover 2 and the furnace body 1 are sealed; when used for welding, the vacuum high-frequency welding point of the instrument 6 passes through the furnace cover and is placed in the furnace body (that is, the instrument passes through the furnace cover and the welding point of the instrument extends into the furnace body), and the instrument 6 and the furnace cover 2 are sealed by the instrument sealing device; one end of the exhaust path 101 is connected to the furnace body, and the other end is connected to the vacuum pump for vacuuming the furnace body; the coil segment 51 of the high-frequency coil 5 is arranged in the furnace body 1, and is used to weld the welding point (that is, vacuum high-frequency welding point) of the instrument 6 by high-frequency induction (that is, vacuum high-frequency induction welding).

[0053] The vacuum high frequency induction welding device can perform local heat treatment on the device 6, such as annealing, and can also perform local brazing. In one embodiment, the vacuum high frequency induction welding device is used for vacuum wall brazing of a cryoablation needle as an example, please refer to Figure 1 In this embodiment, the device 6 is a vacuum wall, which includes: an inner tube 61 and an outer tube 62. The welding points at the upper ends of the inner tube 61 and the outer tube 62 are upper welding points 65, and the welding points at the lower ends are vacuum high-frequency welding points 64. The welding method of the upper welding point 65 is not limited, such as laser welding or brazing, while the vacuum high-frequency welding point 64 can only be placed inside the furnace body 1 and inside the coil segment 51 of the high-frequency coil 5 for vacuum high-frequency induction brazing.

[0054] In one embodiment, the furnace cover 2 includes: a cover plate 21 and an instrument channel 22, one end of the instrument channel 22 is connected to the furnace body, and the inner diameter of the instrument channel is larger than the outer diameter of the instrument; specifically, the inner diameter of the instrument channel 22 is slightly larger than the instrument 6 (outer tube 62), so as to guide the instrument 6 to be inserted into and pulled out of the furnace body in a vertical direction, and prevent the instrument 6 from contacting the instrument sealing ring 4 and the high-frequency coil 5.

[0055] In one embodiment, the instrument sealing device comprises: an instrument sealing cap 3 and an instrument sealing ring 4, wherein the instrument sealing ring 4 is disposed between the instrument sealing cap 3 and the furnace cover 2, and when used for welding, the instrument 6 is passed through the instrument sealing ring 4, and the instrument sealing ring 4 is used to: seal between the instrument 6 and the furnace cover 2 when contacting the furnace cover 2 and the instrument 6 at the same time. The instrument sealing cap 3 is used to: selectively tighten or loosen the instrument sealing ring, wherein the tightened instrument sealing ring 4 contacts the instrument 6, and the loosened instrument sealing ring 4 does not contact the instrument 6.

[0056] Please refer to Figure 1The instrument sealing ring 4 is used to seal between the instrument 6 and the furnace cover 2; the instrument sealing cap 3 is used to adjust the tightness of the instrument sealing ring 4. When the instrument 6 needs to be inserted or pulled out, the instrument sealing ring 4 is loosened by operating the instrument sealing cap 3. When vacuuming and welding are required, the instrument sealing ring 4 is compressed by operating the instrument sealing cap 3. The inner diameter of the instrument sealing ring 4 in the loosened state should be larger than the outer diameter of the instrument 6 (outer tube 62) and larger than the inner diameter of the instrument channel 22, so as to ensure that when the instrument 6 is pulled out after welding, the outer wall of the lower end of the outer tube 62 in a high temperature state will not contact and burn the instrument sealing ring 4. The outer diameter of the instrument sealing ring 4 in the loosened state should not be larger than the inner diameter of the instrument sealing cap 3 (preferably equal), so as to ensure that the instrument sealing ring 4 is in a completely loosened state when the instrument sealing cap 3 is loosened; the inner diameter of the instrument sealing ring 4 in the compressed state should be smaller than the outer diameter of the instrument 6 (outer tube 62), and the outer diameter of the instrument sealing ring 4 in the compressed state should be larger than the inner diameter of the instrument sealing cap 3, so as to achieve the sealing of the inner ring and the outer ring. The form of the instrument sealing cap 3 and the instrument sealing ring 4 is not limited, as long as the tightness of the instrument sealing ring 4 can be adjusted. Preferably, the internal thread of the lower side wall of the instrument sealing cap 3 is connected with the external thread on the upper end of the instrument channel 22. The instrument sealing ring 4 is placed between the inside of the instrument sealing cap 3 and the top plane of the instrument channel 22. The instrument sealing ring 4 is squeezed or loosened by rotating the instrument sealing cap 3. Preferably, the instrument sealing ring 4 is made of a high-temperature resistant fluororubber O-ring.

[0057] In one embodiment, it also includes: a vacuum valve body 11, please refer to Figure 1 The vacuum valve body 11 can also be arranged on the air extraction circuit 101. In this case, the vacuum valve body 11 is used to close the vacuum valve body 11 to cut off the vacuum suction after the welding is completed, so as to facilitate the extraction of the instrument 6. It is also used to open the vacuum valve body for the next vacuum extraction and welding after the sealing of the instrument sealing device is completed during the next welding. Here, the vacuum valve body 11 is preferably a pneumatic vacuum baffle valve.

[0058] In other embodiments, the vacuum valve body 11 may also be disposed on the instrument channel 22, and the vacuum valve body 11 is located between the instrument sealing device and the high-frequency coil. Figure 2 . The vacuum valve body 11 is used to close the vacuum valve body 11 after welding is completed to cut off the vacuum suction, so as to facilitate the extraction of the instrument 6. After the vacuum valve body 11 is closed, the furnace body below the vacuum valve body is still in a vacuum environment. It is also used to open the vacuum valve body for the next vacuum pumping and welding after the sealing of the instrument sealing device is completed during the next welding. At this time, because the vacuum valve body 11 is closed after the last welding is completed, the furnace body below the vacuum valve body 11 is still in a vacuum environment. Therefore, it is only necessary to pump the air between the vacuum valve body and the instrument sealing device, which takes less time and is more efficient. Here, the vacuum valve body is preferably a high vacuum ball valve. The high vacuum ball valve has a larger diameter when opened, which can facilitate the insertion of the instrument 6.

[0059] In a preferred embodiment, the vacuum high frequency induction welding device further includes: a coil circuit 102, a window circuit 103 and a monitoring circuit 104, please refer to Figure 2-4 , Figure 2 It is a three-dimensional schematic diagram. Figure 3 is a top view, Figure 4 The coil path 102 is used to lead the high-frequency coil 5 out of the furnace body 1, and the coil path 102 may not be included. When the coil path 102 is not included, the straight section 52 of the high-frequency coil 5 is directly led out of the furnace body 1. No matter where it is led out, if the lead-out position is made of metal material, insulation and sealing measures must be taken between the straight section 52 of the high-frequency coil 5 and the metal. The coil segment 51 is placed coaxially with the instrument channel 22, the instrument 6 does not contact the coil segment 51, and the entire high-frequency coil 5 does not directly contact the furnace body 1 and the furnace cover 2. The inner diameter of the coil segment 51 should be larger than the outer diameter of the instrument 6, and the height of the coil segment 51 should be such that when the instrument 6 is inserted to the bottom, the vacuum high-frequency welding point 64 is exactly located in the middle of the upper and lower directions of the coil segment 51. The window path 104 can be added with a vacuum window 9 for observing the welding condition of the vacuum high-frequency welding point 64. Optionally, a temperature measuring device (such as an infrared temperature measuring device) can be added outside the vacuum window 9 to monitor the temperature of the vacuum high-frequency welding point 64. The monitoring line 104 is used to measure the vacuum degree in the furnace. Generally, a vacuum measuring instrument 7 is selected for vacuum degree monitoring. Optionally, the monitoring line 104 can also be placed on the bypass of the exhaust line 101. However, optimally, the vacuum measurement point should be as close to the welding point as possible so that the monitoring delay of the vacuum degree in the furnace is minimized. Therefore, it is recommended to set up the monitoring line 104 separately.

[0060] In one embodiment, the exhaust path 101, the coil path 102, the window path 103 and the monitoring path 104 can all use vacuum flange joints, such as KF vacuum joints, CF vacuum joints, ISO vacuum joints, etc. Figure 2-4As shown, the connection of each circuit and the connection between the furnace body 1 and the furnace cover 2 in this embodiment are all in the form of KF vacuum joints, that is, KF flange joint + sealing ring 10 + flange clamp 12 to connect and seal with high vacuum. In this embodiment, the apparatus 6 takes the vacuum wall as an example, including: inner tube 61, outer tube 62, needle rod 63, vacuum high-frequency welding point 64 is the welding point between the outer tube 62 and the lower end of the inner tube 61, the upper welding point 65 is the welding point between the needle rod and the upper end of the inner tube 61, and the middle welding point 66 is the welding point between the outer tube 62 and the needle rod 63. The needle rod of the vacuum wall solution is an integrated structure, which reduces the welding points on the needle rod, has a lower risk of leakage and disconnection, and is safer. The upper welding point 65 is inside the needle rod 63, and it is recommended to use high-frequency induction local welding (no vacuum environment is required). In order to avoid the needle rod in the welding area becoming soft after welding, the hardness can be compensated by quenching, that is, immediately put into water to cool down after welding; the welding method of the middle welding point 66 is not limited. The vacuum high frequency welding spot 64 is welded using the vacuum high frequency induction welding device of the above embodiment.

[0061] In one embodiment, the air extraction circuit 101 is connected or used in conjunction with a vacuum pump (not shown) and a vacuum degree measuring instrument, etc., please refer to Figure 3 , in order to realize the high vacuum environment and vacuum degree monitoring in the furnace body 1. In this embodiment, the vacuum degree measuring instrument includes a vacuum bellows 8, which is arranged on the exhaust path 101. In this embodiment, a vacuum ionization gauge 7 is also provided on a monitoring path 104 which is provided separately, so as to further reduce the monitoring delay of the vacuum degree in the furnace. In different embodiments, the vacuum degree measuring instrument may also adopt other ones as needed, such as: vacuum resistance gauge, etc.; and may also be provided in other places as needed.

[0062] In one embodiment, the operation process of the vacuum high frequency induction welding device is as follows: Figure 5-8 The detailed operation process is as follows:

[0063] (1) Preparation of vacuum wall: nickel plating of the surface of the pipe near all welding points → placing brazing wire or applying brazing material on the upper welding point 65 → vacuum wall assembly → placing brazing wire or applying brazing material on the middle welding point 66 → high-frequency induction welding and quenching of the upper welding point 65 and the middle welding point 66 → placing brazing wire or applying brazing material on the vacuum high-frequency welding point 64, and be sure to leave a small air outlet;

[0064] (2) Equipment preparation: Close the vacuum valve body 11, loosen the instrument sealing cap 3, connect all joints, turn on the vacuum pump, high-frequency welding machine, infrared thermometer and other equipment → When the vacuum degree reaches 10 -3 ~10 -4 At the Pa level, the preparation is complete;

[0065] (3) Single-device vacuum high-frequency welding production line operation: Confirm that the vacuum degree reaches 10 -3 ~10 -4When the vacuum wall 6 reaches the Pa level, the lower end of the vacuum wall 6 is inserted into the upper section 22' of the instrument channel until the lower end of the inner tube 61 is higher than the sealing ball of the vacuum valve body 11 (high vacuum ball valve) and the middle section of the outer tube 62 (except the reducing sections at both ends) reaches the instrument sealing ring 4. Figure 5 As shown → tighten the instrument sealing cap 3 (the instrument sealing ring 4 is compressed), as shown Figure 6 → Open the vacuum valve body 11, as shown Figure 7 As shown → insert the vacuum wall 6 to the bottom (sliding sealing state), as shown Figure 8 As shown → When the vacuum degree reaches 10 -3～ 10 -4 When the vacuum high-frequency welding point reaches the Pa level, start high-frequency induction welding → When the infrared temperature measuring device detects that the vacuum high-frequency welding point has reached the liquid phase temperature of the brazing material, stop high-frequency induction welding → Confirm whether the solder shape covers the vacuum high-frequency welding point 64 under the window → Pull out the vacuum wall 6 upward until the lower end of the inner tube 61 is slightly higher than the sealing ball of the vacuum valve body 11 (high vacuum ball valve), such as Figure 7 → Close the vacuum valve body 11, as shown Figure 6 As shown → Loosen the instrument sealing cap 3 (the instrument sealing ring 4 is loosened), as shown Figure 5 As shown → completely extract the vacuum wall 6 → repeat the above steps (single-instrument vacuum high-frequency welding assembly line operation).

[0066] In a preferred embodiment, the vacuum high-frequency induction welding device can not only weld only one instrument 6, but also weld multiple instruments 6 at the same time. When welding multiple instruments 6 at the same time, it is only necessary to repeatedly arrange the high-frequency coil 5, the instrument sealing cap 3, the instrument sealing ring 4, and the instrument channel 22. Figure 9-11 As shown, taking the simultaneous welding of ten devices 6 as an example, Fig. 9 The figure is a three-dimensional schematic diagram. Fig.10 is a top view, Fig.11 It is a cross-sectional view. In this embodiment, ten groups of high-frequency coils 5, instrument sealing caps 3, instrument sealing rings 4 and instrument channels 22 are arranged along a circle. In different embodiments, they can also be freely arranged as needed.

[0067] In different embodiments, the number of the instrument sealing device and the high-frequency coil may be multiple, not necessarily ten as in the above embodiment, and the arrangement is not necessarily arranged along the circumference as in the above embodiment. The arrangement of the multiple instrument sealing devices on the furnace cover matches the arrangement of the multiple high-frequency coils in the furnace body, and there is a one-to-one correspondence between the instrument sealing device and the high-frequency coil, wherein the instrument sealed by the instrument sealing device can be welded by a corresponding high-frequency coil.

[0068] In this embodiment, the furnace cover 2 and the furnace body 1 are connected by ISO flange, so the caliper screws 13 are used. The exhaust path 101 and the monitoring path 104 are located at the bottom of the furnace body 1, and the vacuum valve body 11 (high vacuum ball valve) is placed on the exhaust path 101. A pad 105 is also provided at the bottom of the furnace body 1 to raise the position of the equipment so that the welding point is exactly level with the high-frequency coil, and the welding effect is better and faster.

[0069] The detailed operation process of this embodiment is described as follows:

[0070] (1) Preparation of vacuum wall: nickel plating of the surface of the pipe near all welding points → placing brazing wire or applying brazing material on the upper welding point 65 → vacuum wall assembly → placing brazing wire or applying brazing material on the middle welding point 66 → high-frequency induction welding and quenching of the upper welding point 65 and the middle welding point 66 → placing brazing wire or applying brazing material on the vacuum high-frequency welding point 64, and be sure to leave a small air outlet;

[0071] (2) Equipment preparation: Loosen the sealing cap 3 of the instrument, close the vacuum valve body 6 → Connect the flange joints, turn on the vacuum pump, high-frequency welding machine and other equipment → When the vacuum degree reaches 10-3~10-4Pa level, the preparation work is completed

[0072] (3) Ten equipment vacuum high frequency welding production line operations:

[0073] Confirm that the vacuum degree reaches 10 -3 ~10 -4 Pa level, insert ten vacuum walls 6 to the bottom → tighten all instrument sealing caps 3 (all instrument sealing rings 4 are compressed) → open the vacuum valve body 12 → when the vacuum degree reaches 10 again -3 ~10 -4 At the Pa level, start ten high-frequency induction welding machines at the same time → stop high-frequency induction welding, close the vacuum valve body 6 → loosen the instrument sealing cap 3 (the instrument sealing ring 4 is loosened) → completely pull out ten vacuum walls 6 → repeat the above steps (ten instrument vacuum high-frequency welding line operation).

[0074] In one embodiment, a vacuum high-frequency induction welding method is also provided, which utilizes the vacuum high-frequency welding device of any of the above embodiments to weld the welding points of the device.

[0075] The vacuum high-frequency induction welding device and method of the above embodiment, by placing only the coil segment of the high-frequency coil in the furnace, and only placing one end of the vacuum high-frequency welding point of the instrument in the furnace, thus achieving the miniaturized design of the furnace body, the time spent on vacuuming the furnace body is short, and efficient assembly line production is realized; through the cooperation of the instrument sealing ring and the vacuum valve body, while realizing local brazing of the vacuum wall and not changing the original hardness and toughness of the needle rod, the rapid and efficient assembly line production of the vacuum wall is further realized; in addition, by setting the vacuum valve body on the instrument channel, each vacuuming only needs to remove the air between the vacuum valve body and the instrument sealing device, which takes less time and is more efficient. Further, not only can the welding of one instrument be realized, but also the welding of multiple instruments can be realized at the same time, further improving the production efficiency. The vacuum high-frequency induction welding device of the above embodiment can perform local heat treatment on the instrument 6, such as annealing, and can also perform local brazing, such as vacuum wall brazing for cryoablation needles. Of course, those skilled in the art may need to apply it to other places, which will not be repeated here.

[0076] The preferred embodiments of the present invention are disclosed herein. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, but are not intended to limit the present invention. Any modifications and changes made by those skilled in the art within the scope of the specification should fall within the scope of protection of the present invention.

Claims

1. A vacuum high frequency induction welding device, characterized in that: include: Furnace body, furnace cover, equipment sealing device, exhaust path and high-frequency coil; among which, The furnace cover covers the opening of the furnace body, and the furnace cover and the furnace body are sealed and connected; When used for welding, the instrument passes through the furnace cover and the welding point of the instrument extends into the furnace body, and the instrument and the furnace cover are sealed by the instrument sealing device; One end of the exhaust path is connected to the furnace body and is used to evacuate the furnace body; The coil section of the high-frequency coil is arranged in the furnace body and is used to weld the welding points of the device by high-frequency induction; The instrument sealing device comprises: an instrument sealing ring and an instrument sealing cap; wherein, The instrument sealing ring is arranged between the instrument sealing cap and the furnace cover. When used for welding, the instrument is inserted through the instrument sealing ring. The instrument sealing ring is used to seal between the instrument and the furnace cover when the instrument contacts the furnace cover and the instrument at the same time. The instrument sealing cap is used to selectively tighten or loosen the sealing ring, wherein the instrument sealing ring contacts the instrument after tightening and does not contact the instrument after loosening; The furnace cover comprises: a cover plate and an instrument channel for the instrument to pass through; wherein, The cover plate covers the opening of the furnace body, and the cover plate is sealed and connected to the furnace body; The inner diameter of the instrument channel is greater than the outer diameter of the instrument, and one end of the instrument channel is connected to the furnace body; It also includes: a vacuum valve body, which is arranged on the instrument channel and located between the instrument sealing device and the high-frequency coil; The vacuum valve body is used to be closed after welding is completed, and is also used to be opened after the sealing of the instrument sealing device is completed during the next welding.

2. The vacuum high frequency induction welding device according to claim 1, characterized in that: Also includes: A coil path is directly or indirectly connected to the high frequency coil and extends to the outside of the furnace body.

3. The vacuum high frequency induction welding device according to claim 1, characterized in that: Also includes: A temperature measuring device is used to monitor the temperature of the soldering point.

4. The vacuum high frequency induction welding device according to claim 1, characterized in that: Also includes: A monitoring path, wherein the monitoring path is used to monitor the vacuum degree in the furnace body and / or the vacuum degree of the exhaust port of the exhaust path.

5. The vacuum high frequency induction welding device according to claim 1, characterized in that: The device is the vacuum wall of a cryoablation needle.

6. The vacuum high frequency induction welding device according to any one of claims 1 to 5, characterized in that: The number of the instrument sealing device and the number of the high-frequency coil are both multiple; The arrangement of multiple instrument sealing devices on the furnace cover matches the arrangement of multiple high-frequency coils in the furnace body, and there is a one-to-one correspondence between the instrument sealing devices and the high-frequency coils, wherein the instrument sealed by the instrument sealing device can be welded by a corresponding high-frequency coil.

7. A vacuum high frequency induction welding method, characterized in that: The welding points of the equipment are welded using the vacuum high-frequency welding device described in any one of claims 1 to 6.

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