Double-channel regulation and control direct current needle valve for pulse tube refrigerator phase modulation

Abstract

The invention relates to the technical field of pulse tube refrigerator phase modulation, and provides a dual-channel regulation and control direct current needle valve for pulse tube refrigerator phase modulation, the dual-channel regulation and control direct current needle valve for pulse tube refrigerator phase modulation comprises a valve seat and a valve core, the valve seat is provided with a valve cavity and a first flow channel communicated with the valve cavity; a valve hole is formed in the first flow channel; the valve element is movably installed in the valve cavity, the valve element is provided with an abutting end which is movably connected with the valve hole in an abutting mode, and the valve element and the valve hole are matched to control the flow of the first flow channel; a second flow channel is formed in the valve element, one end of the second flow channel penetrates through the end face of the abutting end to be correspondingly communicated with the valve hole, and the first flow channel and the second flow channel are arranged in parallel. On the premise that an additional phase modulation auxiliary device is not introduced, the phase adjustment difficulty of the pulse tube refrigerator can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of phase modulation of a pulse tube refrigerator, and in particular to a dual-channel regulating direct current needle valve used for phase modulation of a pulse tube refrigerator. Background Art

[0002] The needle valve is a plunger valve, whose valve plug is a cone at a certain angle, used to adjust the gas flow. It is mainly composed of a valve stem, a valve plug, and a valve seat. The valve stem has threads that match the threaded holes in the valve body, and the tail is sealed with an O-ring. The distance between the cone plunger and the hole on the valve body is controlled by screwing the valve stem in and out, and the size of this distance determines the flow through the valve.

[0003] One of the main advantages of the needle valve is that it can control the flow very accurately, and can be adjusted continuously and finely from closed to open. Therefore, needle valves are widely used in pulse tube refrigerators. For example, small orifice valves and two-way valves can use needle valves. Both small orifice valves and two-way valves are devices used to optimize the performance of pulse tube refrigerators. This optimization process is also called phase adjustment process. During the refrigerator commissioning process, it is difficult to find the exact opening of the two-way valve. A big reason is that the asymmetry of the needle valve geometry will cause the time-averaged mass flow in the pulse tube refrigerator to be non-zero, causing the performance of the refrigerator to deteriorate. It is difficult to eliminate direct current by adjusting the needle valve opening. Summary of the invention

[0004] The present invention provides a dual-channel regulating DC needle valve for phase adjustment of a pulse tube refrigerator, so as to solve the defect of complex phase adjustment structure in the prior art, and effectively reduce the difficulty of adjusting the phase of the pulse tube refrigerator without introducing additional phase adjustment auxiliary devices.

[0005] The present invention provides a dual-channel regulating DC needle valve for phase modulation of a pulse tube refrigerator, comprising: A valve seat, the valve seat having a valve cavity and a first flow channel communicating with the valve cavity, wherein a valve hole is formed in the first flow channel; A valve core, the valve core is movably installed in the valve cavity, the valve core has an abutment end movably abutted with the valve hole, and the valve core cooperates with the valve hole to control the flow rate of the first flow channel; A second flow channel is provided in the valve core, and one end of the second flow channel passes through the end surface of the abutting end and is correspondingly connected to the valve hole, and the first flow channel and the second flow channel are arranged in parallel.

[0006] According to a dual-channel regulating DC needle valve for phase adjustment of a pulse tube refrigerator provided by the present invention, the abutment end is provided with a protrusion protruding toward the valve hole, an abutment cone is formed on the outer side of the protrusion, the abutment cone is movably abutted with the valve hole, and one end of the second flow channel is penetrated at the center of the abutment cone.

[0007] According to a dual-channel regulating DC needle valve for phase adjustment of a pulse tube refrigerator provided by the present invention, the second flow channel includes a first flow segment and a second flow segment, the first flow segment is extended along the axial centerline direction of the valve core, the second flow segment is extended along the radial direction of the cross-section of the valve core, the first flow segment is connected to the second flow segment, and an end of the first flow segment away from the second flow segment passes through the end face of the abutting end.

[0008] According to a dual-channel regulating DC needle valve for phase adjustment of a pulse tube refrigerator provided by the present invention, a plurality of second flow segments are provided on the valve core, the plurality of second flow segments are evenly arranged along the circumferential direction of the cross section of the valve core, and the plurality of second flow segments are connected with the first flow segment at the axial center position of the valve core.

[0009] According to a dual-channel regulating DC needle valve for phase adjustment of a pulse tube refrigerator provided by the present invention, a plurality of the second flow segments and a plurality of the first flow segments are provided on the valve core, the first flow channels and the second flow channels are connected one-to-one, the plurality of the second flow segments are evenly arranged along the circumferential direction of the cross section of the valve core, and the plurality of the first flow segments are evenly arranged circumferentially around the axial centerline of the valve core.

[0010] According to a dual-channel regulating DC needle valve for phase adjustment of a pulse tube refrigerator provided by the present invention, a first connecting port and a second connecting port are provided on the valve seat, and the first flow channel and the second flow channel are respectively connected to the first connecting port and the second connecting port.

[0011] According to a dual-channel regulating DC needle valve for phase adjustment of a pulse tube refrigerator provided by the present invention, a threaded connection portion is provided on the inner wall surface of the valve cavity, a threaded mating portion is provided on the outer peripheral wall of the valve core corresponding to the threaded connection portion, and the valve core and the valve seat are threadedly connected via the threaded connection portion and the threaded mating portion.

[0012] According to a dual-channel regulating DC needle valve for phase adjustment of a pulse tube refrigerator provided by the present invention, a thrust step is provided on the inner wall surface of the valve cavity, and a thrust surface is provided on the outer peripheral wall of the valve core corresponding to the thrust step, and the thrust surface cooperates with the thrust step to limit the valve core.

[0013] According to a dual-channel regulating DC needle valve for phase adjustment of a pulse tube refrigerator provided by the present invention, a mounting opening is provided on the valve seat, the mounting opening is communicated with the valve cavity, and the valve core is installed in the valve cavity via the mounting opening.

[0014] According to a dual-channel regulating DC needle valve for phase adjustment of a pulse tube refrigerator provided by the present invention, the dual-channel regulating DC needle valve for phase adjustment of a pulse tube refrigerator also includes a sealing member, a sealing groove is provided at one end of the valve core close to the mounting opening, the sealing member is embedded in the sealing groove and abuts between the valve core and the inner wall of the valve cavity.

[0015] The dual-channel regulating direct current needle valve for phase adjustment of a pulse tube refrigerator provided by the present invention opens a second flow channel inside the valve core so that a portion of the gas can pass through the first flow channel formed between the valve core and the valve seat, and the other portion of the gas can pass through the second channel opened inside the valve core. In this way, the influence of the asymmetry of the needle valve geometric structure on the time-averaged mass flow in the pulse tube refrigerator can be reduced, the difficulty of adjusting the phase of the pulse tube refrigerator is effectively reduced, the debugging time of the phase of the pulse tube refrigerator is greatly shortened, and the phase adjustment efficiency of the pulse tube refrigerator is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are 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.

[0017] Figure 1 It is a structural schematic diagram of a dual-channel regulating DC needle valve for phase modulation of a pulse tube refrigerator provided by the present invention.

[0018] Reference numerals: 10. Dual-channel DC needle valve for phase adjustment of pulse tube refrigerator; 100, valve seat; 110, valve cavity; 120, first flow channel; 130, valve hole; 140, first connection port; 150, second connection port; 160, threaded connection portion; 170, mounting opening; 180, thrust step; 200, valve core; 210, abutment end; 211, raised portion; 212, abutment cone surface; 220, second flow channel; 221, first flow section; 222, second flow section; 230, threaded fitting portion; 240, thrust surface; 250, sealing groove. DETAILED DESCRIPTION

[0019] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0020] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0021] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0022] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0023] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0024] Combine the following Figure 1, the dual-channel regulating DC needle valve for phase modulation of a pulse tube refrigerator provided in an embodiment of the present invention is described in detail through specific embodiments and application scenarios.

[0025] In the embodiments of the invention, reference is made to Figure 1 The dual-channel regulating DC needle valve 10 for phase modulation of a pulse tube refrigerator includes a valve seat 100 and a valve core 200. The valve seat 100 has a valve cavity 110 and a first flow channel 120 connected to the valve cavity 110, and a valve hole 130 is formed in the first flow channel 120; the valve core 200 is movably installed in the valve cavity 110, and the valve core 200 has an abutting end 210 movably abutted with the valve hole 130, and the valve core 200 cooperates with the valve hole 130 to control the flow size of the first flow channel 120; a second flow channel 220 is opened in the valve core 200, and one end of the second flow channel 220 passes through the end surface of the abutting end 210 and is correspondingly connected to the valve hole 130, and the first flow channel 120 and the second flow channel 220 are arranged in parallel.

[0026] The valve seat 100 is the basic structure of the needle valve, providing a space (valve chamber 110) for accommodating the valve core 200 and a first flow channel 120 communicating with the outside. The valve seat 100 provides stable support for the entire needle valve system and ensures the inlet and outlet path of the air flow.

[0027] The valve cavity 110 is a space located inside the valve seat 100 for installing the valve core 200. It provides a space for the movement of the valve core 200 so that the valve core 200 can move up and down or rotate therein to adjust the flow rate.

[0028] The first flow channel 120 is a main passage for gas to pass through, which extends from one end of the valve seat 100 to the other end and communicates with the valve cavity 110. When the position of the valve core 200 changes, the opening of the first flow channel 120 also changes accordingly, thereby controlling the size of the airflow.

[0029] The valve hole 130 is located in the first flow channel 120 and is a key position for gas to pass through. The valve hole 130 cooperates with the abutting end 210 of the valve core 200 to adjust the gas flow by changing the gap between the two.

[0030] The valve core 200 is the core component of the needle valve, and the valve core 200 is movably installed in the valve cavity 110 and can move relative to the valve seat 100. The abutment end 210 on the valve core 200 is closely matched with the valve hole 130, and the size of the airflow is controlled by adjusting its position.

[0031] The abutting end 210 is a part of the valve core 200 and directly contacts the valve hole 130. The cooperation between the abutting end 210 and the valve hole 130 determines the opening of the first flow channel 120.

[0032] The second flow channel 220 is an additional channel opened inside the valve core 200, one end of which passes through the end face of the abutment end 210 and is connected to the valve hole 130. It should be noted that the second flow channel 220 is normally open. The second flow channel 220 provides an additional airflow passage, so that part of the gas can flow through this passage instead of relying solely on the first flow channel 120. The uniformity of the airflow is increased, and the problem of the time-averaged mass flow rate not being zero due to the geometric asymmetry of the needle valve is reduced. Through two parallel flow channels, the airflow can be adjusted more finely, improving the efficiency and accuracy of the phase adjustment operation.

[0033] The first flow channel 120 and the second flow channel 220 are arranged in parallel, and the gas can flow through these two independent paths at the same time. The parallel design provides more airflow path options, helps to distribute the airflow more evenly, and reduces the problem of uneven airflow distribution caused by a single path. The parallel setting improves the flexibility and accuracy of flow control, helps to find the best working point, reduces the difficulty of phase adjustment, shortens the debugging time, and improves the overall performance of the pulse tube refrigerator.

[0034] The present application provides a second flow channel 220 inside the valve core 200, so that a portion of the gas can pass through the first flow channel 120 formed between the valve core 200 and the valve seat 100, and another portion of the gas can pass through the second channel provided inside the valve core 200. In this way, the influence of the asymmetry of the needle valve geometric structure on the time-averaged mass flow in the pulse tube refrigerator can be reduced, the difficulty of adjusting the phase of the pulse tube refrigerator is effectively reduced, the debugging time of the phase of the pulse tube refrigerator is greatly shortened, and the phase adjustment efficiency of the pulse tube refrigerator is effectively improved.

[0035] Reference Figure 1 According to the present invention, a dual-channel regulating DC needle valve 10 for phase modulation of a pulse tube refrigerator is provided. The abutment end 210 is provided with a protrusion 211 protruding toward the valve hole 130, and an abutment cone surface 212 is formed on the outer side of the protrusion 211. The abutment cone surface 212 is movably abutted with the valve hole 130, and one end of the second flow channel 220 is penetrated at the center of the abutment cone surface 212.

[0036] It is understandable that in this embodiment, a raised portion, namely a raised portion 211, is provided on the abutting end 210 of the valve core 200 in the direction toward the valve hole 130. A conical surface, namely abutting cone 212, is formed on the outer side of the raised portion 211. The abutting cone 212 is movably abutted with the inner wall of the valve hole 130 to more accurately control the flow of the fluid. The design of the raised portion 211 and the abutting cone 212 increases the contact area between the valve core 200 and the valve hole 130 and improves the sealing effect. The abutting cone 212 can better fit with the inner wall of the valve hole 130, reducing the possibility of leakage. One end of the second flow channel 220 is arranged at the center of the abutting cone 212 to ensure the effective connection between the second flow channel 220 and the valve hole 130.

[0037] The role of the following additional feature in the scheme is explained in detail: According to a dual-channel regulating DC needle valve 10 for phase adjustment of a pulse tube refrigerator provided by the present invention, the second flow channel 220 includes a first flow segment 221 and a second flow segment 222, the first flow segment 221 is extended along the axial direction of the valve core 200, and the second flow segment 222 is extended along the radial direction of the cross-section of the valve core 200, the first flow segment 221 is connected to the second flow segment 222, and the end of the first flow segment 221 away from the second flow segment 222 passes through the end face of the abutting end 210.

[0038] It is understandable that in this embodiment, by dividing the second flow channel 220 into a first flow section 221 and a second flow section 222, the gas can flow along two different paths. The first flow section 221 extends along the axis direction, while the second flow section 222 extends radially. More airflow path options are provided, so that the gas can be more evenly distributed inside the valve core 200. Multi-path airflow distribution helps to reduce local concentration of airflow, improve the uniformity and stability of airflow, and thus optimize flow control.

[0039] The first flow segment 221 extends in the direction of the axial centerline, and can directly introduce or guide gas from the end face of the abutment end 210, and then flow out or out radially through the second flow segment 222. This allows the gas to directly enter the second flow channel 220 through the center position, reducing the resistance in the airflow path. Since the airflow path is more direct and uniform, the flow regulation becomes more precise. The traditional single flow channel design may lead to uneven airflow distribution, especially when the needle valve is geometrically asymmetric. By introducing the setting of the first flow segment and the second flow segment 222, the airflow distribution can be further balanced, reducing the problem of non-zero time-averaged mass flow rate caused by geometric asymmetry. The symmetry of the airflow is improved, and the efficiency and accuracy of the phase adjustment operation are improved, thereby improving the overall performance of the pulse tube refrigerator.

[0040] Reference Figure 1According to a dual-channel regulating DC needle valve 10 for phase modulation of a pulse tube refrigerator provided by the present invention, a plurality of second flow segments 222 are provided on the valve core 200, and the plurality of second flow segments 222 are evenly arranged along the circumferential direction of the cross section of the valve core 200, and the plurality of second flow segments 222 are connected to the first flow segment 221 at the axial position of the valve core 200.

[0041] It can be understood that, in this embodiment, multiple second flow segments 222 are arranged evenly along the circumferential direction of the cross section of the valve core 200, thereby ensuring uniform distribution of the airflow in all directions. This uniform arrangement reduces the problem of non-zero time-averaged mass flow rate due to geometric asymmetry. The symmetry of the airflow is improved, and the efficiency and accuracy of the phase adjustment operation are improved, thereby improving the overall performance of the pulse tube refrigerator. At the same time, the multi-path airflow distribution allows the gas to be more evenly dispersed inside the valve core 200, reducing the local concentration of the airflow and improving the overall uniformity of the airflow.

[0042] Reference Figure 1 According to a dual-channel regulating DC needle valve 10 for phase modulation of a pulse tube refrigerator provided by the present invention, a plurality of second flow segments 222 and a plurality of first flow segments 221 are provided on the valve core 200, the first flow channel 120 and the second flow channel 220 are connected one by one, the plurality of second flow segments 222 are evenly arranged along the circumferential direction of the cross section of the valve core 200, and the plurality of first flow segments 221 are evenly arranged around the circumferential direction of the axis of the valve core 200.

[0043] It is understandable that, in this embodiment, by setting a plurality of first flow segments 221 and a plurality of second flow segments 222, the gas can flow along a plurality of different radial and axial paths. Each first flow segment 221 and the second flow segment 222 form an independent airflow path. In this way, the multi-path airflow distribution allows the gas to be more evenly dispersed inside the valve core 200, reduces the local concentration of the airflow, and improves the overall uniformity of the airflow. At the same time, the design of the plurality of first flow segments 221 and the second flow segment 222 allows the gas to flow out through a plurality of radial and axial paths, thereby providing more flow adjustment points. When the valve core 200 moves, more refined flow control can be achieved by adjusting the relative opening between the various flow segments. This makes the flow regulation more precise, and the user can more easily find the optimal working point, especially when looking for the accurate opening of the two-way valve during the debugging process, which can significantly reduce the difficulty of debugging.

[0044] Reference Figure 1 According to the present invention, a dual-channel regulating DC needle valve 10 for phase modulation of a pulse tube refrigerator is provided, and a first connecting port 140 and a second connecting port 150 are provided on the valve seat 100, and the first flow channel 120 and the second flow channel 220 are respectively connected to the first connecting port 140 and the second connecting port 150.

[0045] It is understandable that by providing two independent connection ports, the system integration process can be simplified. The user can directly connect the external pipeline to the two connection ports without the need for additional flow dividing devices or complicated pipeline arrangements. The first flow channel 120 and the second flow channel 220 are respectively connected to the first connection port 140 and the second connection port 150 to achieve the parallel arrangement of the first flow channel 120 and the second flow channel 220.

[0046] Of course, in other embodiments, the second flow channel 220 may also be disposed inside the first flow channel 120 , and communicate with the first connection port 140 and the second connection port 150 through the first flow channel 120 .

[0047] The role of the following additional feature in the scheme is explained in detail: According to a dual-channel regulating DC needle valve 10 for phase adjustment of a pulse tube refrigerator provided in the present invention, a threaded connection portion 160 is provided on the inner wall surface of the valve cavity 110, and a threaded mating portion 230 is provided on the outer peripheral wall of the valve core 200 corresponding to the threaded connection portion 160, and the valve core 200 and the valve seat 100 are threadedly connected via the threaded connection portion 160 and the threaded mating portion 230.

[0048] It is understandable that a threaded connection portion 160 is provided on the inner wall surface of the valve cavity 110, and a threaded matching portion 230 is correspondingly provided on the outer peripheral wall of the valve core 200. The connection structure between the valve core 200 and the valve seat 100 is formed by matching each other in the form of threads. This allows the valve core 200 to rotate and move axially to a certain extent in the valve cavity 110 while maintaining a stable connection state. By rotating the valve core 200, the flow area of ​​the first flow channel 120 can be changed, thereby achieving precise control of the flow rate.

[0049] Reference Figure 1 According to the present invention, a dual-channel regulating DC needle valve 10 for phase modulation of a pulse tube refrigerator is provided. A thrust step 180 is provided on the inner wall surface of the valve cavity 110, and a thrust surface 240 is provided on the outer peripheral wall of the valve core 200 corresponding to the thrust step 180. The thrust surface 240 cooperates with the thrust step 180 to limit the valve core 200.

[0050] It is understandable that the design of the thrust step 180 and the thrust surface 240 can limit the maximum movement range of the valve core 200 in the valve cavity 110. When the valve core 200 moves to the limit position, the thrust surface 240 will contact the thrust step 180 to prevent the valve core 200 from moving further. This limiting mechanism can prevent the valve core 200 from being damaged due to excessive rotation or movement, and protect the internal structure of the needle valve.

[0051] Reference Figure 1According to the present invention, a dual-channel regulating DC needle valve 10 for phase modulation of a pulse tube refrigerator is provided. A mounting opening 170 is opened on the valve seat 100, and the mounting opening 170 is communicated with the valve cavity 110. The valve core 200 is installed in the valve cavity 110 through the mounting opening 170.

[0052] It is understandable that the installation opening 170 provides a passage for the valve core 200 to enter and exit the valve cavity 110. The user can easily install or remove the valve core 200 from the valve cavity 110 through this opening. This simplifies the installation and removal process of the valve core 200, reduces the maintenance difficulty and time cost. At the same time, the installation opening 170 also increases the adjustment window for the user to adjust the opening of the valve core 200.

[0053] Reference Figure 1 According to the present invention, a dual-channel regulating DC needle valve 10 for phase modulation of a pulse tube refrigerator is provided. The dual-channel regulating DC needle valve 10 for phase modulation of a pulse tube refrigerator also includes a sealing member. A sealing groove 250 is provided at one end of the valve core 200 close to the installation opening 170. The sealing member is embedded in the sealing groove 250 and abuts between the valve core 200 and the inner wall of the valve cavity 110.

[0054] It is understandable that the seal is embedded in the seal groove 250 of the valve core 200 and is in close contact with the inner wall of the valve cavity 110 to form a reliable sealing interface. This can effectively prevent gas from leaking from the gap between the valve core 200 and the valve cavity 110. This improves the sealing performance of the needle valve and ensures the accuracy and reliability of airflow control.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dual-channel DC needle valve for phase modulation of a pulse tube refrigerator, characterized in that: include: A valve seat, the valve seat having a valve cavity and a first flow channel communicating with the valve cavity, wherein a valve hole is formed in the first flow channel; A valve core, the valve core is movably installed in the valve cavity, the valve core has an abutment end movably abutted with the valve hole, and the valve core cooperates with the valve hole to control the flow rate of the first flow channel; A second flow channel is provided in the valve core, and one end of the second flow channel passes through the end surface of the abutting end and is correspondingly connected to the valve hole, and the first flow channel and the second flow channel are arranged in parallel.

2. The dual-channel regulating DC needle valve for phase adjustment of a pulse tube refrigerator according to claim 1, characterized in that: The abutting end is provided with a protruding portion protruding toward the valve hole, an abutting cone surface is formed on the outer side of the protruding portion, the abutting cone surface is movably abutted with the valve hole, and one end of the second flow channel is penetrated at the center of the abutting cone surface.

3. The dual-channel regulating DC needle valve for phase adjustment of a pulse tube refrigerator according to claim 1, characterized in that: The second flow channel includes a first flow segment and a second flow segment, the first flow segment is extended along the axial centerline direction of the valve core, the second flow segment is extended along the radial direction of the cross section of the valve core, the first flow segment is connected to the second flow segment, and an end of the first flow segment away from the second flow segment passes through the end face of the abutting end.

4. The dual-channel regulating DC needle valve for phase adjustment of a pulse tube refrigerator according to claim 3, characterized in that: The valve core is provided with a plurality of the second flow segments, the plurality of the second flow segments are evenly arranged along the circumferential direction of the cross section of the valve core, and the plurality of the second flow segments are connected with the first flow segment at the axial center position of the valve core.

5. The dual-channel regulating DC needle valve for phase adjustment of a pulse tube refrigerator according to claim 3, characterized in that: The valve core is provided with a plurality of the second flow segments and a plurality of the first flow segments, the first flow channels and the second flow channels are connected one-to-one, the plurality of the second flow segments are evenly arranged along the circumferential direction of the cross section of the valve core, and the plurality of the first flow segments are evenly arranged around the circumferential direction of the axial centerline of the valve core.

6. The dual-channel regulating DC needle valve for phase modulation of a pulse tube refrigerator according to any one of claims 1 to 5, characterized in that: The valve seat is provided with a first connection port and a second connection port, and the first flow channel and the second flow channel are communicated with the first connection port and the second connection port respectively.

7. The dual-channel regulating DC needle valve for phase modulation of a pulse tube refrigerator according to any one of claims 1 to 5, characterized in that: A threaded connection portion is provided on the inner wall surface of the valve cavity, a threaded matching portion is provided on the outer peripheral wall of the valve core corresponding to the threaded connection portion, and the valve core and the valve seat are threadedly connected through the threaded connection portion and the threaded matching portion.

8. The dual-channel regulating DC needle valve for phase modulation of a pulse tube refrigerator according to any one of claims 1 to 5, characterized in that: A thrust step is provided on the inner wall surface of the valve cavity, and a thrust surface is provided on the outer peripheral wall of the valve core corresponding to the thrust step. The thrust surface cooperates with the thrust step to limit the valve core.

9. The dual-channel regulating DC needle valve for phase modulation of a pulse tube refrigerator according to any one of claims 1 to 5, characterized in that: The valve seat is provided with an installation opening, the installation opening is communicated with the valve cavity, and the valve core is installed in the valve cavity via the installation opening.

10. The dual-channel regulating DC needle valve for phase adjustment of a pulse tube refrigerator according to claim 9, characterized in that: The dual-channel regulating DC needle valve for phase adjustment of a pulse tube refrigerator also includes a sealing member. A sealing groove is provided at one end of the valve core close to the installation opening. The sealing member is embedded in the sealing groove and abuts between the valve core and the inner wall of the valve cavity.

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