Electronic expansion valve

Abstract

The utility model provides an electronic expansion valve. The electronic expansion valve comprises a valve pipe; the valve seat part is connected with one end of the valve pipe, the valve seat part is provided with a first cavity and a second cavity, the side wall of the first cavity is provided with a first circulation opening, and the second cavity is provided with a second circulation opening; the valve seat core is fixed in the valve seat part and separates the first cavity from the second cavity, and the valve seat core is provided with a valve port; the first filtering structure is arranged in the first cavity, and the first filtering structure is used for filtering impurities in the medium flowing in from the first circulation opening; and / or, the second filtering structure is arranged in the second cavity, and the second filtering structure is used for filtering impurities in the medium flowing in from the second circulation opening; and a valve needle structure. According to the scheme, whether the electronic expansion valve is used as a one-way flow valve or a two-way flow valve, the first filtering structure and / or the second filtering structure can effectively prevent impurities in a medium from entering the electronic expansion valve, and the problem that the impurities in the medium of the electronic expansion valve block the interior of the electronic expansion valve is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic expansion valves, and more specifically, to an electronic expansion valve. Background Art

[0002] Both of the two flow ports of the electronic expansion valve can serve as the medium inlet, and the electronic expansion valve can achieve bidirectional flow. In different air conditioning systems, the electronic expansion valve can be used as a unidirectional flow valve or a bidirectional flow valve. When the electronic expansion valve is used as a unidirectional flow valve, the medium enters the interior of the electronic expansion valve from one of the flow ports of the electronic expansion valve and then flows out from the other flow port; when the electronic expansion valve is used as a bidirectional flow valve, under different flow directions, the medium can enter the interior of the electronic expansion valve from the two flow ports respectively. Whether it is in the case of unidirectional flow or bidirectional flow, the medium can enter the interior of the electronic expansion valve through the communication hole. Specifically, the medium enters the rotor cavity and the valve needle cavity inside the electronic expansion valve, blocking the gap between the threaded engagement section of the valve needle structure and the nut structure or the guiding section of the valve needle structure and the nut structure, or blocking the gap between the rotor and the valve tube, resulting in the jamming of the rotor or the valve needle structure, and causing the performance of the electronic expansion valve to deteriorate or fail. Therefore, an electronic expansion valve that can prevent impurities from entering the valve needle cavity and the rotor cavity and avoid the jamming of the valve needle structure or the rotor is needed. Summary of the Utility Model

[0003] The utility model provides an electronic expansion valve to solve the problem that impurities in the medium of the existing electronic expansion valve block the interior of the electronic expansion valve.

[0004] To solve the above problems, the utility model provides an electronic expansion valve, including:

[0005] A valve tube;

[0006] A valve seat part, connected to one end of the valve tube, the valve seat part has a first cavity and a second cavity, the side wall of the first cavity has a first flow port, and the second cavity has a second flow port;

[0007] A valve seat core, fixed inside the valve seat part and separating the first cavity and the second cavity, the valve seat core has a valve port;

[0008] A first filtering structure, arranged in the first cavity, the first filtering structure is used to filter impurities in the medium flowing in from the first flow port; and / or,

[0009] A second filtering structure, arranged in the second cavity, the second filtering structure is used to filter impurities in the medium flowing in from the second flow port;

[0010] A valve needle structure, movably arranged in the cavity formed by the valve tube and the valve seat part to open and close the valve port and adjust the opening degree.

[0011] Further, the electronic expansion valve further includes a nut structure fixedly connected to the valve seat portion. The first filtering structure extends along the axis of the electronic expansion valve, surrounds the valve needle structure. Along the axial direction of the first filtering structure, one end of the first filtering structure is connected to the nut structure in a limiting manner, and the other end of the first filtering structure is connected to the valve seat core in a limiting manner. The nut structure, the valve seat core and the first filtering structure form a filtering cavity, and the first filtering structure prevents impurities in the medium flowing into the first flow port from entering the filtering cavity.

[0012] Further, one end of the nut structure close to the valve seat core has a limiting section, one end of the first filtering structure is sleeved on the limiting section, one end of the valve seat core close to the nut structure has a protruding section, and the other end of the first filtering structure is sleeved on the protruding section.

[0013] Further, the first filtering structure includes a first filter screen, one end of the first filter screen is connected to the nut structure in a limiting manner, and the other end of the first filter screen is connected to the valve seat core in a limiting manner; or,

[0014] The first filtering structure includes a first filter screen and a first fixing sleeve. The first fixing sleeve is arranged at the end of the first filter screen to support the first filter screen, and the first fixing sleeve is connected to the nut structure and / or the valve seat core.

[0015] Further, the valve seat portion has a first limiting step, the second filtering structure has a flanging, the flanging of the second filtering structure is in limiting fit with the first limiting step, and the valve seat core is arranged on the side of the flanging away from the first limiting step.

[0016] Further, the first limiting step has an inner ring and an outer ring. The diameter of the inner ring is smaller than that of the outer ring to form the first limiting step. An annular groove is arranged at a position close to the outer ring at the first limiting step, and the annular groove is used for placing a welding ring.

[0017] Further, the valve seat portion is an integral structure, and the inside of the valve seat portion has a cavity, and the cavity includes a first cavity and a second cavity.

[0018] Further, the valve seat portion includes a valve seat and a lower sleeve. One end of the valve seat away from the valve tube along the axis direction of the electronic expansion valve has a first reduced diameter section, and the outer periphery of the first reduced diameter section is fitted and installed with the inner wall of the lower sleeve.

[0019] Further, the valve seat portion includes a valve seat and a lower sleeve. The outer wall of the lower sleeve is connected to the inner wall of the valve seat in a matching manner. The second filtering structure has a flanging. Along the axis direction of the electronic expansion valve, the flanging of the second filtering structure abuts against the side of the valve seat core away from the valve tube, and one end of the lower sleeve facing the valve seat core abuts against the side of the flanging away from the valve tube.

[0020] Further, the valve seat portion includes a valve seat and a lower casing. The lower casing is connected to one end of the valve seat facing away from the valve tube. The second filtering structure includes a second fixing sleeve and a second filter screen. The second fixing sleeve is fixed to the lower casing.

[0021] Further, the inner wall of the lower casing has a limiting inner protrusion protruding inwards. The limiting inner protrusion axially limits one end of the second fixing sleeve away from the valve tube.

[0022] Further, the limiting inner protrusion is a convex ring or a convex bubble.

[0023] Further, the outer periphery of the lower casing is connected to the inner wall of the valve seat in a mating manner. The valve seat has a second limiting step. The second limiting step axially and radially limits the valve seat core. The valve seat core axially limits one end of the second fixing sleeve close to the valve tube.

[0024] Further, along the axis direction of the electronic expansion valve, one end of the valve seat facing away from the valve tube has a first reduced-diameter section. The outer periphery of the first reduced-diameter section is connected to the inner wall of the lower casing in a mating manner. The end face of one end of the valve seat facing away from the valve tube abuts against one end of the second fixing sleeve facing away from the limiting inner protrusion.

[0025] Further, the outer periphery of the valve seat core is fixedly connected to the inner wall of the valve seat. The valve seat and the valve seat core are of an integral structure. A second reduced-diameter section is provided at one end of the valve seat core close to the lower casing. The second reduced-diameter section axially limits the second fixing sleeve.

[0026] Further, the side wall of the lower casing has an annular flanging. The flanging axially limits one end of the second fixing sleeve facing away from the valve tube. One end of the valve seat facing away from the valve tube has a first reduced-diameter section. The outer periphery of the first reduced-diameter section is connected to the inner wall of the lower casing in a mating manner. One end of the valve seat facing away from the valve tube axially limits one end of the second fixing sleeve close to the valve tube.

[0027] Further, the second filtering structure includes a second filter screen. The second filter screen is in sheet form. The valve seat portion includes a valve seat and a lower casing. The lower casing is connected to one end of the valve seat facing away from the valve tube. The second filter screen is arranged between the lower casing and the valve seat.

[0028] Further, one end of the valve seat facing away from the valve tube has a first reduced-diameter section. The outer periphery of the first reduced-diameter section is connected to the inner wall of the lower casing in a mating manner. The lower casing has a third limiting step. The third limiting step abuts against one side of the second filter screen. The other side of the second filter screen abuts against the end face of one side of the valve seat facing away from the valve tube.

[0029] Further, the first filtering structure includes a first filter screen. The area of the part of the first filter screen that actually plays a filtering role is S. The mesh number of the first filter screen is n. The wire diameter of the first filter screen is r. The diameter of the valve port is d; or, the second filtering structure includes a second filter screen. The area of the part of the second filter screen that actually plays a filtering role is S. The mesh number of the second filter screen is n. The wire diameter of the second filter screen is r. The diameter of the valve port is d;

[0030] The first filtering structure and / or the second filtering structure need to satisfy:

[0031]

[0032] Applying the technical solution of the present utility model, an electronic expansion valve is provided, including: a valve tube; a valve seat portion connected to one end of the valve tube, the valve seat portion having a first cavity and a second cavity, the side wall of the first cavity having a first flow port, and the second cavity having a second flow port; a valve seat core fixed within the valve seat portion and separating the first cavity and the second cavity, the valve seat core having a valve port; a first filtering structure disposed within the first cavity for filtering impurities in the medium flowing in through the first flow port; and / or a second filtering structure disposed within the second cavity for filtering impurities in the medium flowing in through the second flow port; a valve needle structure movably disposed within the cavity formed by the valve tube and the valve seat portion to open and close the valve port and adjust the opening degree. With this solution, the valve seat core separates the valve seat portion into a first cavity and a second cavity. The first filtering structure is disposed within the first cavity to filter the medium entering through the first flow port, preventing impurities in the medium flowing in through the first flow port from entering the interior of the electronic expansion valve. The second filtering structure is disposed within the second cavity to filter the medium flowing in through the second flow port, preventing impurities in the medium of the second flow port from entering the interior of the electronic expansion valve. The valve needle structure reciprocates axially along the electronic expansion valve to achieve the opening and closing of the valve port and the adjustment of the opening degree. When the electronic expansion valve is used as a one-way flow valve, the first filtering structure or the second filtering structure can separately filter impurities in the medium, preventing impurities in the medium from entering the interior of the electronic expansion valve. When the electronic expansion valve is used as a two-way flow valve, a first filtering structure can be disposed within the first cavity and a second filtering structure can be disposed within the second cavity respectively, to prevent impurities in the fluid from entering the interior of the electronic expansion valve when the fluid in the electronic expansion valve flows in both forward and reverse directions. Through this solution, the first filtering structure and / or the second filtering structure effectively prevent impurities in the medium from entering the interior of the electronic expansion valve. Specifically, it prevents impurities in the medium from entering the rotor cavity and the valve needle cavity inside the electronic expansion valve, blocking the gap between the threaded engagement section of the valve needle structure and the nut structure or the guiding section between the valve needle structure and the nut structure, or blocking the gap between the rotor and the valve tube, and avoiding performance degradation or performance failure of the electronic expansion valve caused by jamming of the rotor or the valve needle structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The specification drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0034] Figure 1Shows the structural schematic diagram of the electronic expansion valve provided by the first embodiment of the present utility model;

[0035] Figure 2 Shows Figure 1 The partial enlarged view at position A in;

[0036] Figure 3 Shows Figure 1 The structural schematic diagram of the nut structure of the electronic expansion valve in from a top view angle;

[0037] Figure 4 Shows the structural schematic diagram of the electronic expansion valve provided by the second embodiment of the present utility model;

[0038] Figure 5 Shows Figure 4 The partial enlarged view at position B in;

[0039] Figure 6 Shows the structural schematic diagram of the electronic expansion valve provided by the third embodiment of the present utility model;

[0040] Figure 7 Shows Figure 6 The partial enlarged view at position C in;

[0041] Figure 8 Shows the structural schematic diagram of the electronic expansion valve provided by the fourth embodiment of the present utility model;

[0042] Figure 9 Shows Figure 8 The partial enlarged view at position D in;

[0043] Figure 10 Shows the structural schematic diagram of the electronic expansion valve provided by the fifth embodiment of the present utility model;

[0044] Figure 11 Shows Figure 10 The partial enlarged view at position E in;

[0045] Figure 12 Shows the structural schematic diagram of the electronic expansion valve provided by the sixth embodiment of the present utility model;

[0046] Figure 13 Shows Figure 12 The partial enlarged view at position H in;

[0047] Figure 14 Shows the structural schematic diagram of the electronic expansion valve provided by the seventh embodiment of the present utility model;

[0048] Figure 15 Shows Figure 14 The partial enlarged view at position F in;

[0049] Figure 16The figure shows a schematic diagram of the structure of an electronic expansion valve provided in the eighth embodiment of the present utility model;

[0050] Figure 17 Shows Figure 16 A partial enlarged view of point G in the middle.

[0051] The above drawings include the following reference numerals:

[0052] 10. Valve pipe;

[0053] 20. Valve seat;

[0054] 21. valve seat; 211. first reduced diameter section; 212. second limiting step;

[0055] 22, lower casing; 221, limiting inner convex; 222, folding edge; 223, third limiting step;

[0056] 23. First limiting step; 24. Annular groove;

[0057] 201, first cavity; 202, second cavity;

[0058] 30. valve seat core; 31. raised section; 32. second reduced diameter section;

[0059] 40. first filtering structure; 41. first filter screen; 42. first fixing sleeve;

[0060] 50. Second filtering structure; 51. Second filter screen; 52. Second fixing sleeve;

[0061] 60. Valve needle structure;

[0062] 70. Nut structure; 71. Limiting section; 72. Connecting channel. DETAILED DESCRIPTION

[0063] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0064] like Figures 1 to 2As shown in the figure, Embodiment 1 of the present utility model provides an electronic expansion valve, which includes a valve tube 10, a valve seat portion 20, a valve seat core 30, a first filtering structure 40, a second filtering structure 50 and a valve needle structure 60. The valve seat portion 20 is connected to one end of the valve tube 10. The valve seat portion 20 has a first cavity 201 and a second cavity 202. The side wall of the first cavity 201 has a first flow port, and the second cavity 202 has a second flow port. The valve seat core 30 is fixed inside the valve seat portion 20 and separates the first cavity 201 and the second cavity 202. The valve seat core 30 has a valve port. The first filtering structure 40 is arranged in the first cavity 201, and the first filtering structure 40 is used to filter impurities in the medium flowing in through the first flow port. And / or, the second filtering structure 50 is arranged in the second cavity 202, and the second filtering structure 50 is used to filter impurities in the medium flowing in through the second flow port. The valve needle structure 60 is movably arranged in the cavity formed by the valve tube 10 and the valve seat portion 20 to open and close the valve port and adjust the opening degree.

[0065] The valve needle structure 60 can be a structure in which the valve needle and the screw are integrated, or a structure in which the valve needle and the screw are separately arranged.

[0066] With this solution, the valve seat core 30 divides the valve seat portion 20 into a first cavity 201 and a second cavity 202, so that the media in the first cavity 201 and the second cavity 202 are filtered separately, increasing the effective filtering area. The first filtering structure 40 is arranged in the first cavity 201 to filter the medium entering through the first flow port, preventing impurities in the medium flowing in through the first flow port from entering the interior of the electronic expansion valve. The second filtering structure 50 is arranged in the second cavity 202 to filter the medium flowing in through the second flow port, preventing impurities in the medium of the second flow port from entering the interior of the electronic expansion valve. The valve needle structure 60 reciprocates along the axial direction of the electronic expansion valve to realize the opening and closing of the valve port and the adjustment of the opening degree.

[0067] When the electronic expansion valve is used as a one-way flow valve, the first filtering structure or the second filtering structure can separately filter impurities in the medium, preventing impurities in the medium from entering the interior of the electronic expansion valve. When the electronic expansion valve is used as a two-way flow valve, a first filtering structure can be arranged in the first cavity and a second filtering structure can be arranged in the second cavity respectively to prevent impurities in the fluid from entering the interior of the electronic expansion valve when the fluid in the electronic expansion valve flows in both forward and reverse directions. Through this solution, the first filtering structure and / or the second filtering structure effectively prevent impurities in the medium from entering the interior of the electronic expansion valve. Specifically, it prevents impurities in the medium from entering the rotor cavity and the valve needle cavity inside the electronic expansion valve, solving the problem that impurities in the medium of the electronic expansion valve block the gap between the rotor and the valve tube 10, the threaded engagement section between the valve needle structure 60 and the nut structure 70, or the gap between the guiding sections of the valve needle structure 60 and the nut structure 70.

[0068] Optionally, the first flow port is arranged on the side wall of the first cavity 201, and the second flow port is arranged at one end of the second cavity 202 away from the valve seat core 30.

[0069] As Figure 2 shown, the electronic expansion valve further includes a nut structure 70. The nut structure 70 is fixedly connected to the valve seat portion 20. The first filtering structure 40 extends along the axis of the electronic expansion valve. The first filtering structure 40 surrounds the valve needle structure 60. Along the axis direction of the first filtering structure 40, one end of the first filtering structure 40 is connected to the nut structure 70 in a limiting manner, and the other end of the first filtering structure 40 is connected to the valve seat core 30 in a limiting manner. The nut structure 70, the valve seat core 30 and the first filtering structure 40 form a filtering cavity. The first filtering structure 40 prevents impurities in the medium flowing in from the first flow port from entering the filtering cavity.

[0070] With such an arrangement, the valve needle structure 60 moves relative to the nut structure 70 to realize the opening and closing of the valve port and the adjustment of the opening degree. The nut structure 70, the valve seat core 30 and the first filtering structure 40 form a filtering cavity. The first filtering structure 40 prevents impurities in the medium entering from the first flow port from entering the filtering cavity, thereby avoiding impurities in the medium flowing in from the first flow port from entering the interior of the electronic expansion valve and blocking the gap between the rotor and the valve tube 10, or the gap between the threaded mating section or the guiding section of the valve needle structure and the nut structure 70.

[0071] Optionally, the first filtering structure 40 includes a first filter screen 41. One end of the first filter screen 41 is connected to the nut structure 70 in a limiting manner, and the other end of the first filter screen 41 is connected to the valve seat core 30 in a limiting manner. Both ends of the first filter screen 41 are respectively arranged on the nut structure 70 and the valve seat core 30, so that the nut structure 70 and the valve seat core 30 respectively support and limit both ends of the first filter screen 41, avoiding deformation or displacement of the first filter screen 41 under the impact of the medium.

[0072] Optionally, as Figure 3 shown, there is a rotor cavity between the valve tube 10 and the nut structure 70. The nut structure 70 has a communication channel 72, and the communication channel 72 communicates the rotor cavity and the filtering cavity. The first filtering structure 40 prevents impurities in the medium flowing in from the first flow port from entering the filtering cavity, thereby avoiding impurities in the medium from entering the rotor cavity through the communication channel 72 and blocking the gap between the rotor and the valve tube 10, or the gap between the threaded mating section or the guiding section of the valve needle structure 60 and the nut structure 70.

[0073] Impurities in the medium flowing into the first flow port can enter the rotor cavity through the communication channel 72 of the nut structure 70 or the gap between the valve needle structure 60 and the nut structure 70, and then block the gap between the rotor and the valve tube 10, or the gap between the threaded engagement section or the guiding section of the valve needle structure and the nut structure 70, resulting in the jamming of the valve needle structure or the rotor. The first filtering structure 40 forms a filtering cavity, preventing impurities in the medium flowing into the first flow port from entering the communication channel 72 or the gap between the valve needle structure 60 and the nut structure 70. Impurities in the medium flowing into the second flow port can enter the second cavity 202, then enter the first cavity 201 through the valve port, and further enter the rotor cavity through the communication channel 72 of the nut structure 70 or the gap between the valve needle structure 60 and the nut structure 70. The second filtering structure 50 intercepts the impurities in the medium flowing into the second flow port in the second cavity 202, preventing the impurities from entering the valve needle cavity and the rotor cavity, and thus preventing the impurities from blocking the gap between the rotor and the valve tube 10, or the gap between the threaded engagement section or the guiding section of the valve needle structure 60 and the nut structure 70.

[0074] As Figure 1 shown, one end of the nut structure 70 close to the valve seat core 30 has a limiting section 71, one end of the first filtering structure 40 is sleeved on the limiting section 71, one end of the valve seat core 30 close to the nut structure 70 has a protruding section 31, and the other end of the first filtering structure 40 is sleeved on the protruding section 31.

[0075] With such an arrangement, the protruding section 31 limits one end of the first filtering structure 40 close to the valve seat core 30, and the limiting section 71 limits one end of the first filtering structure 40 close to the nut structure 70.

[0076] As Figure 2 shown, the valve seat portion 20 has a first limiting step 23, the second filtering structure 50 has a flanging, the flanging of the second filtering structure 50 is in limiting cooperation with the first limiting step 23, and the valve seat core 30 is arranged on the side of the flanging away from the first limiting step 23.

[0077] With the above arrangement, the valve seat core 30 and the first limiting step 23 respectively limit both sides of the flanging, so that the flanging is fixed on the valve seat portion 20, and the second filter screen 51 is fixed in the second cavity 202 through the flanging of the second filtering structure 50.

[0078] Optionally, the second filtering structure 50 includes a second filter screen 51 and a second fixing sleeve 52, and the second fixing sleeve 52 is used to support the second filter screen 51. The second fixing sleeve 52 includes a supporting section and a flanging, the supporting section is used to support the second filter screen 51, and the flanging is fixed to the valve seat portion 20.

[0079] As Figure 2As shown in the figure, the first limiting step 23 has an inner ring and an outer ring. The diameter of the inner ring is smaller than that of the outer ring, that is, the inner ring is closer to the axis of the electronic expansion valve than the outer ring. A first limiting step 23 is formed between the inner ring and the outer ring, that is, a first limiting step 23 is formed between the inner ring and the outer ring for the end face where the flanging is limited and abutted. An annular groove 24 is provided at a position near the outer ring at the first limiting step 23. The annular groove 24 is used to place a welding ring for furnace welding of the valve seat core 30, the second filtering structure 50, and the valve seat part 20.

[0080] With such a setting, after placing the welding ring in the annular groove 24, the valve seat core 30, the second filtering structure 50, and the valve seat part 20 are subjected to furnace welding to fixedly connect the valve seat core 30, the second filtering structure 50, and the valve seat part 20.

[0081] As Figure 2 shown in the figure, the valve seat part 20 is an integral structure, and the inside of the valve seat part 20 has a cavity, and the cavity includes a first cavity 201 and a second cavity 202.

[0082] With such a setting, the valve seat core 30 divides the cylindrical cavity inside the valve seat part 20 into a first cavity 201 and a second cavity 202. The first filtering structure 40 in the first cavity 201 filters the medium entering from the first flow port, and the second filtering structure 50 in the second cavity 202 filters the medium entering from the second flow port.

[0083] As Figure 4 and Figure 5 shown in the figure, in the second embodiment of the present invention, the difference from the first embodiment is that the valve seat part 20 includes a valve seat 21 and a lower sleeve 22. The valve seat 21 has a first reduced-diameter section 211 at one end far from the valve tube 10 along the axis direction of the electronic expansion valve, and the outer periphery of the first reduced-diameter section 211 is fitted and installed with the inner wall of the lower sleeve 22.

[0084] With such a setting, the valve seat part 20 is separately provided as the valve seat 21 and the lower sleeve 22, and a second flow port is provided in the lower sleeve 22, and the processing difficulty is reduced through the split design.

[0085] In the first embodiment and the second embodiment, a welding ring is placed in the annular groove 24, and the valve seat core 30 and the valve seat part 20 are welded by furnace welding to limit the second filtering structure 50.

[0086] As Figure 6 and Figure 7As shown in the figure, in the third embodiment of the present utility model, the difference from the first embodiment is that the valve seat portion 20 includes a valve seat 21 and a lower casing 22. The outer wall of the lower casing 22 is cooperatively connected with the inner wall of the valve seat 21. The second filtering structure 50 has a flanging. Along the axial direction of the electronic expansion valve, the flanging of the second filtering structure 50 abuts against one side of the valve seat core 30 away from the valve tube 10, and one end of the lower casing 22 facing the valve seat core 30 abuts against one side of the flanging away from the valve tube 10.

[0087] With such a setting, the outer wall of the lower casing 22 is cooperatively connected with the inner wall of the valve seat 21, so that the outer diameter of the lower casing 22 is smaller than that of the valve seat 21. Through the split design of the valve seat 21 and the lower casing 22, the outer diameter of the lower casing 22 is reduced, the miniaturization of the structure is realized, the installation space of the electronic expansion valve is saved, and at the same time, the processing difficulty is reduced through the split design.

[0088] As Figure 8 and Figure 9 shown in the figure, in the fourth embodiment of the present utility model, the difference from the first embodiment is that the valve seat portion 20 includes a valve seat 21 and a lower casing 22. The lower casing 22 is connected to one end of the valve seat 21 away from the valve tube 10. The second filtering structure 50 includes a second fixing sleeve 52 and a second filter screen 51. The second fixing sleeve 52 is fixed to the lower casing 22.

[0089] With such a setting, the second filter screen 51 is supported by the second fixing sleeve 52. The second fixing sleeve 52 is fixed to the lower casing 22 to fix the second filter screen 51, and the lower casing 22 limits the second fixing sleeve 52.

[0090] As Figure 9 shown in the figure, the inner wall of the lower casing 22 has an inwardly protruding limiting inner protrusion 221, and the limiting inner protrusion 221 axially limits one end of the second fixing sleeve 52 away from the valve tube 10.

[0091] With such a setting, the limiting inner protrusion 221 is arranged on the inner wall of the lower casing 22. The limiting inner protrusion 221 limits one end of the second fixing sleeve 52 away from the valve tube 10, so that the second fixing sleeve 52 is limited within the lower casing 22.

[0092] Optionally, the limiting inner protrusion 221 is a convex ring or a convex bubble.

[0093] With such a setting, the limiting inner protrusion 221 is set as a convex ring. The convex ring is arranged circumferentially to axially limit the second fixing sleeve 52, so that the second fixing sleeve 52 cannot axially move relative to the convex ring. The limiting inner protrusion 221 is set as a convex bubble. The convex bubble protrudes from the inner wall of the lower casing 22, and the second fixing sleeve 52 is clamped on the inner wall of the lower casing 22 and will not axially move.

[0094] As Figure 9As shown in the figure, the outer periphery of the lower casing 22 is fitted and connected to the inner wall of the valve seat 21. The valve seat 21 has a second limiting step 212, and the second limiting step 212 axially and radially limits the valve seat core 30. The valve seat core 30 axially limits one end of the second fixing sleeve 52 close to the valve pipe 10. Specifically, the second limiting step includes a first limiting surface and a second limiting surface. The second limiting surface is located on the inner wall of the valve seat 21 and extends along the axis direction of the electronic expansion valve. The second limiting surface abuts against the outer peripheral surface of the valve seat core 30 to limit the radial displacement of the valve seat core 30. The first limiting surface is perpendicular to the axis direction of the electronic expansion valve. Along the axis direction of the electronic expansion valve, one side of the valve seat core 30 facing away from the valve pipe 10 abuts against one side of the second fixing sleeve 52 close to the valve pipe 10. The first limiting surface faces the second flow port, and the first limiting surface abuts against one end of the valve seat core 30 facing away from the second flow port to limit the displacement of the valve seat core 30 in the direction away from the second flow port.

[0095] With such a setting, the limiting convex 221 axially limits one end of the second fixing sleeve 52 away from the valve pipe 10, and the second limiting step 212 axially limits one end of the second fixing sleeve 52 close to the valve pipe 10, so that the second fixing sleeve 52 cannot move axially, and the second filter screen 51 is fixed in the second cavity 202.

[0096] As Figure 10 and Figure 11 As shown in the figure, in the fifth embodiment of the present invention, the difference from the fourth embodiment is that along the axis direction of the electronic expansion valve, one end of the valve seat 21 facing away from the valve pipe 10 has a first reduced diameter section 211. The outer periphery of the first reduced diameter section 211 is fitted and connected to the inner wall of the lower casing 22, and the end surface of one end of the valve seat 21 facing away from the valve pipe 10 abuts against one end of the second fixing sleeve 52 facing away from the limiting convex 221.

[0097] With such a setting, the outer periphery of the first reduced diameter section 211 of the valve seat 21 is fitted and connected to the inner wall of the lower casing 22, so that the valve seat 21 is connected to the lower casing 22. The limiting convex 221 axially limits one end of the second fixing sleeve 52 away from the valve pipe 10, and one end of the valve seat 21 facing away from the valve pipe 10 limits the other end of the second fixing sleeve 52, so that the second fixing sleeve 52 cannot move axially, and the second filter screen 51 is fixed in the second cavity 202 to filter the medium entering from the second flow port.

[0098] As Figure 12 and Figure 13As shown, in the sixth embodiment of the present utility model, the first filtering structure includes a first filter screen 41 and a first fixing sleeve 42, the first fixing sleeve 42 is arranged at the end of the first filter screen 41 to support the first filter screen 41, and the first fixing sleeve 42 is connected to the nut structure 70 and / or the valve seat core 30. The outer periphery of the valve seat core 30 is fixedly connected to the inner wall of the valve seat 21, the valve seat 21 and the valve seat core 30 are an integral structure, and the end of the valve seat core 30 close to the lower sleeve 22 is provided with a second reduced diameter section 32, and the second reduced diameter section 32 limits the axial position of the second fixing sleeve 52.

[0099] There are one or two first fixing sleeves 42. When one first fixing sleeve 42 is provided, the first fixing sleeve 42 can cooperate with the nut structure 70 or the valve seat core 30 to support and limit the first filter screen 41; when two first fixing sleeves 42 are provided, the two first fixing sleeves 42 respectively cooperate with the nut structure 70 or the valve seat core 30 to support and limit the first filter screen 41.

[0100] Optionally, the nut structure 70 or the valve seat core 30 has a groove to limit the first fixing sleeve 42 .

[0101] The valve seat 21 and the valve seat core 30 are provided as an integrated structure, which reduces the difficulty of installing the electronic expansion valve, makes the installation of the electronic expansion valve more convenient and quick, and saves time and cost. In addition, the welding connection between the valve seat 21 and the valve seat core 30 is avoided, the process is reduced, and the connection between the valve seat 21 and the valve seat core 30 is avoided from being loosened or misaligned.

[0102] like Figure 14 and Figure 15 As shown, in the seventh embodiment of the utility model, the difference from the fourth embodiment is that the side wall of the lower sleeve 22 has an annular folded edge 222, and the folded edge 222 axially limits the end of the second fixed sleeve 52 away from the valve pipe 10, and the end of the valve seat 21 away from the valve pipe 10 has a first reduced diameter section 211, and the outer periphery of the first reduced diameter section 211 is cooperatively connected with the inner wall of the lower sleeve 22, and the end of the valve seat 21 away from the valve pipe 10 is axially limited to the end of the second fixed sleeve 52 close to the valve pipe 10.

[0103] In this way, the annular folded edge 222 limits the end of the second fixed sleeve 52 away from the valve tube 10, and the end of the valve seat 21 away from the valve tube 10 limits the other end of the second fixed sleeve 52, so that the second fixed sleeve 52 cannot move axially. The second fixed sleeve 52 fixes the second filter screen 51 in the second cavity 202 to filter the medium entering the second flow port.

[0104] like Figure 16 and Figure 17As shown, in the eighth embodiment of the present utility model, the difference from the first embodiment is that the second filter structure 50 includes a second filter screen 51, the second filter screen 51 is sheet-shaped, the valve seat portion 20 includes a valve seat 21 and a lower sleeve 22, the lower sleeve 22 is connected to the end of the valve seat 21 away from the valve tube 10, and the second filter screen 51 is arranged between the lower sleeve 22 and the valve seat 21.

[0105] In this configuration, the second filter screen 51 is in a sheet shape, and the second filter screen 51 filters the medium entering the second flow port to prevent impurities in the medium from entering the interior of the electronic expansion valve and causing blockage.

[0106] The valve seat core 30 and the valve seat portion 20 of the present application can be directly connected by laser welding, such as Examples 3 to 7 of the present application, or by providing an annular groove 24 on the valve seat portion 20, placing a welding ring in the annular groove 24, and connecting the valve seat core 30 and the valve seat portion 20 by furnace welding, such as Examples 1 and 2 of the present application.

[0107] Furthermore, if Figure 17 As shown, the end of the valve seat 21 facing away from the valve tube 10 has a first reduced diameter section 211, the outer periphery of the first reduced diameter section 211 is cooperatively connected with the inner wall of the lower sleeve 22, the lower sleeve 22 has a third limiting step 223, the third limiting step 223 abuts against one side of the second filter screen 51, and the other side of the second filter screen 51 abuts against the end face of the valve seat 21 facing away from the valve tube 10.

[0108] In this configuration, the first reduced diameter section 211 of the valve seat 21 is connected with the inner wall of the lower sleeve 22 to connect the valve seat 21 with the lower sleeve 22. The third limiting step 223 and the valve seat 21 limit the two sides of the second filter screen 51 respectively to fix the second filter screen 51 in the second cavity 202, so that the second filter screen 51 filters the medium entering the second flow port.

[0109] Further, the first filtering structure 40 includes a first filter screen 41, the area of ​​the part of the first filter screen 41 that actually plays a filtering role is S, the mesh number of the first filter screen 41 is n, the wire diameter of the first filter screen 41 is r, and the diameter of the valve port is d; or, the second filtering structure 50 includes a second filter screen 51, the area of ​​the part of the second filter screen 51 that actually plays a filtering role is S, the mesh number of the second filter screen 51 is n, the wire diameter of the second filter screen 51 is r, and the diameter of the valve port is d;

[0110] The first filter structure 40 and / or the second filter structure 50 need to meet the following requirements:

[0111]

[0112] With such a setting, in order to filter out smaller impurities, it is necessary to set the first filtering structure 40 and the second filtering structure 50 with smaller pore diameters. The meshes of the first filtering structure 40 and the second filtering structure 50 with small pore diameters are likely to be blocked. Therefore, it is necessary to increase the effective filtering areas of the first filter screen 41 and the second filter screen 51, and set the flow area corresponding to the part of the first filtering structure 40 and / or the second filtering structure 50 that actually plays a filtering role to be greater than or equal to the diameter of the valve port, which can effectively reduce the throttling effect of the two filtering structures on the refrigerant fluid passing through the valve port, and ensure the flow capacity of the electronic expansion valve provided by the present application.

[0113] Part of the areas of the first filter screen 41 and the second filter screen 51 are used for limiting or contacting other structures, such as limiting and cooperating with the second fixing sleeve 52, the nut structure 70, and the valve seat core 30. Therefore, only part of the areas of the first filter screen 41 and the second filter screen 51 actually play a filtering role, and the area that actually plays a filtering role is the actual area of the first filter screen 41 and / or the second filter screen 51 minus the area used for limiting or contacting other structures.

[0114] Optionally, the flow area of the pipeline connected to the first flow port and the second flow port is greater than the flow area of the valve port, and the cross-sectional area of the valve seat 21 is greater than the flow area of the pipeline connected to the first flow port and the second flow port.

[0115] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0116] It should be noted that the terms used here are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0117] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that for the convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the description. In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0118] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description. Without contrary description, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus cannot be understood as limiting the protection scope of the present utility model; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0119] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above-mentioned", etc. can be used here to describe the spatial positional relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations should be made for the spatial relative descriptions used here.

[0120] In addition, it should be noted that the use of words such as "first", "second", etc. to limit components is only for the convenience of differentiating the corresponding components. Without otherwise stating, the above words have no special meaning, and thus cannot be understood as limiting the protection scope of the present utility model.

Claims

1. An electronic expansion valve, characterized in that: include: Valve pipe (10); A valve seat portion (20) connected to one end of the valve tube (10), the valve seat portion (20) having a first cavity (201) and a second cavity (202), the side wall of the first cavity (201) having a first flow opening, and the second cavity (202) having a second flow opening; A valve seat core (30) is fixed in the valve seat portion (20) and separates the first cavity (201) and the second cavity (202), and the valve seat core (30) has a valve port; A first filter structure (40) is disposed in the first cavity (201), and the first filter structure (40) is used to filter impurities in the medium flowing into the first flow port; and / or, A second filtering structure (50) is disposed in the second cavity (202), and the second filtering structure (50) is used to filter impurities in the medium flowing into the second flow port; The valve needle structure (60) is movably arranged in a cavity formed by the valve tube (10) and the valve seat portion (20) to open and close the valve port and adjust the opening.

2. The electronic expansion valve according to claim 1, characterized in that: The electronic expansion valve further comprises a nut structure (70), wherein the nut structure (70) is fixedly connected to the valve seat portion (20), the first filter structure (40) extends along the axis of the electronic expansion valve, the first filter structure (40) surrounds the valve needle structure (60), and along the axis direction of the first filter structure (40), one end of the first filter structure (40) is limitedly connected to the nut structure (70), and the other end of the first filter structure (40) is limitedly connected to the valve seat core (30), the nut structure (70), the valve seat core (30) and the first filter structure (40) form a filter cavity, and the first filter structure (40) prevents impurities in the medium flowing into the first flow port from entering the filter cavity.

3. The electronic expansion valve according to claim 2, characterized in that: The nut structure (70) has a limiting section (71) at one end close to the valve seat core (30), and one end of the first filter structure (40) is sleeved on the limiting section (71); the valve seat core (30) has a raised section (31) at one end close to the nut structure (70), and the other end of the first filter structure (40) is sleeved on the raised section (31).

4. The electronic expansion valve according to claim 2, characterized in that: The first filter structure (40) comprises a first filter screen (41), one end of the first filter screen (41) is position-limitedly connected to the nut structure (70), and the other end of the first filter screen (41) is position-limitedly connected to the valve seat core (30); or, The first filtering structure comprises a first filter screen (41) and a first fixing sleeve (42), wherein the first fixing sleeve (42) is arranged at the end of the first filter screen (41) to support the first filter screen (41), and the first fixing sleeve (42) is connected to the nut structure (70) and / or the valve seat core (30).

5. The electronic expansion valve according to claim 1, characterized in that: The valve seat portion (20) has a first limiting step (23), the second filter structure (50) has a flange, the flange of the second filter structure (50) is limitedly matched with the first limiting step (23), and the valve seat core (30) is arranged on a side of the flange away from the first limiting step (23).

6. The electronic expansion valve according to claim 5, characterized in that: The first limiting step (23) has an inner ring and an outer ring, the diameter of the inner ring is smaller than the diameter of the outer ring, so as to form the first limiting step (23), and an annular groove (24) is provided at the first limiting step (23) and close to the outer ring, and the annular groove (24) is used to place a welding ring.

7. The electronic expansion valve according to claim 5, characterized in that: The valve seat portion (20) is an integral structure, and the interior of the valve seat portion (20) has a cavity, and the cavity comprises the first cavity (201) and the second cavity (202).

8. The electronic expansion valve according to claim 5, characterized in that: The valve seat portion (20) comprises a valve seat (21) and a lower sleeve (22); the valve seat (21) has a first reduced diameter section (211) at one end away from the valve tube (10) along the axial direction of the electronic expansion valve; the outer periphery of the first reduced diameter section (211) is mounted in cooperation with the inner wall of the lower sleeve (22).

9. The electronic expansion valve according to claim 1, characterized in that: The valve seat portion (20) comprises a valve seat (21) and a lower sleeve (22); the outer wall of the lower sleeve (22) is cooperatively connected with the inner wall of the valve seat (21); the second filter structure (50) has a flange; along the axial direction of the electronic expansion valve, the flange of the second filter structure (50) abuts against a side of the valve seat core (30) away from the valve tube (10); and one end of the lower sleeve (22) facing the valve seat core (30) abuts against a side of the flange away from the valve tube (10).

10. The electronic expansion valve according to claim 1, characterized in that: The valve seat portion (20) comprises a valve seat (21) and a lower sleeve (22), the lower sleeve (22) being connected to an end of the valve seat (21) away from the valve tube (10), the second filtering structure (50) comprising a second fixed sleeve (52) and a second filter screen (51), the second fixed sleeve (52) being fixed to the lower sleeve (22).

11. The electronic expansion valve according to claim 10, characterized in that: The inner wall of the lower sleeve (22) has a limiting inner protrusion (221) protruding inwardly, and the limiting inner protrusion (221) axially limits the end of the second fixing sleeve (52) away from the valve tube (10).

12. The electronic expansion valve according to claim 11, characterized in that: The limiting inner protrusion (221) is a protruding ring or a protruding bubble.

13. The electronic expansion valve according to claim 11, characterized in that: The outer periphery of the lower sleeve (22) is cooperatively connected with the inner wall of the valve seat (21); the valve seat (21) has a second limiting step (212); the second limiting step (212) limits the valve seat core (30) axially and radially; the valve seat core (30) limits the axial position of one end of the second fixing sleeve (52) close to the valve pipe (10).

14. The electronic expansion valve according to claim 11, characterized in that: Along the axial direction of the electronic expansion valve, the end of the valve seat (21) facing away from the valve tube (10) has a first reduced diameter section (211), the outer periphery of the first reduced diameter section (211) is cooperatively connected with the inner wall of the lower sleeve (22), and the end surface of the end of the valve seat (21) facing away from the valve tube (10) abuts against the end of the second fixing sleeve (52) facing away from the limiting inner protrusion (221).

15. The electronic expansion valve according to claim 14, characterized in that: The outer periphery of the valve seat core (30) is fixedly connected to the inner wall of the valve seat (21); the valve seat (21) and the valve seat core (30) are an integral structure; a second reduced diameter section (32) is provided at one end of the valve seat core (30) close to the lower sleeve (22); the second reduced diameter section (32) limits the axial position of the second fixed sleeve (52).

16. The electronic expansion valve according to claim 10, characterized in that: The side wall of the lower sleeve (22) has an annular folded edge (222), and the folded edge (222) axially limits the end of the second fixed sleeve (52) away from the valve pipe (10). The end of the valve seat (21) away from the valve pipe (10) has a first reduced diameter section (211), and the outer periphery of the first reduced diameter section (211) is cooperatively connected with the inner wall of the lower sleeve (22). The end of the valve seat (21) away from the valve pipe (10) axially limits the end of the second fixed sleeve (52) close to the valve pipe (10).

17. The electronic expansion valve according to claim 1, characterized in that: The second filtering structure (50) comprises a second filter screen (51), the second filter screen (51) is in sheet shape, the valve seat portion (20) comprises a valve seat (21) and a lower sleeve (22), the lower sleeve (22) is connected to an end of the valve seat (21) away from the valve pipe (10), and the second filter screen (51) is arranged between the lower sleeve (22) and the valve seat (21).

18. The electronic expansion valve according to claim 17, characterized in that: The end of the valve seat (21) facing away from the valve tube (10) has a first reduced diameter section (211), the outer periphery of the first reduced diameter section (211) is cooperatively connected with the inner wall of the lower sleeve (22), the lower sleeve (22) has a third limiting step (223), the third limiting step (223) abuts against one side of the second filter screen (51), and the other side of the second filter screen (51) abuts against the end face of the valve seat (21) facing away from the valve tube (10).

19. The electronic expansion valve according to claim 1, characterized in that: The first filtering structure (40) comprises a first filter screen (41), the area of ​​the part of the first filter screen (41) that actually plays a filtering role is S, the mesh number of the first filter screen (41) is n, the wire diameter of the first filter screen (41) is r, and the diameter of the valve port is d; or, the second filtering structure (50) comprises a second filter screen (51), the area of ​​the part of the second filter screen (51) that actually plays a filtering role is S, the mesh number of the second filter screen (51) is n, the wire diameter of the second filter screen (51) is r, and the diameter of the valve port is d; The first filtering structure (40) and / or the second filtering structure (50) need to meet the following requirements:

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