Valve core assembly, electronic expansion valve and refrigeration equipment

Abstract

This utility model discloses a valve core assembly, an electronic expansion valve, and a refrigeration device, relating to the technical field of refrigeration equipment. The valve core assembly includes a lead screw assembly, a valve needle, and a bearing. The lead screw assembly includes a lead screw comprising a main body section and a protruding section connected together. The main body section is used for transmission connection with a drive structure. A protrusion is provided on the outer peripheral wall of the lead screw, located between the main body section and the protruding section. The valve needle is coaxially arranged with the lead screw, and a mounting groove is provided on the side of the valve needle facing the lead screw. The inner ring of the bearing abuts against the protrusion on one axial direction, and the outer ring of the bearing is fixed to the groove wall of the mounting groove. The inner ring of the bearing is welded or interference-fitted to the lead screw assembly. The technical solution provided by this utility model simplifies the complexity of the valve core assembly and reduces assembly errors.

Description

Technical Field

[0001] This utility model relates to the technical field of refrigeration equipment, and in particular to a valve core assembly, an electronic expansion valve, and refrigeration equipment. Background Technology

[0002] The valve core assembly in current electronic expansion valves generally consists of a bearing, a lead screw, a preload spring, a pressure sleeve, and a valve needle. The bearing is sleeved on the lead screw, one end is limited by the preload spring, and the other end is fixed by the pressure sleeve. This structure has relatively complex parts and is prone to large assembly errors. Utility Model Content

[0003] The main purpose of this invention is to provide a valve core assembly, an electronic expansion valve, and a refrigeration device, which aims to simplify the complexity of the valve core assembly and reduce assembly errors.

[0004] To achieve the above objectives, the valve core assembly proposed in this utility model includes:

[0005] A lead screw assembly includes a lead screw, which includes a main body section and an extension section connected to each other. The main body section is used for transmission connection with a drive structure. The outer peripheral wall of the lead screw is provided with a protrusion, which is located between the main body section and the extension section.

[0006] A valve needle, coaxially arranged with the lead screw, and having a mounting groove on the side of the valve needle facing the lead screw; and

[0007] The bearing has its inner ring abutting against the protrusion on one side in the axial direction, its outer ring fixed to the wall of the mounting groove, and its inner ring welded or interference-fitted to the lead screw assembly.

[0008] In one embodiment, the inner ring of the bearing is welded to the lead screw, and the axial length of the extended section is greater than the axial length of the bearing.

[0009] In one embodiment, the inner ring of the bearing is clearance-fitted with the outer peripheral wall of the lead screw, and the lead screw assembly further includes an annular washer, which is sleeved between the lead screw and the inner ring of the bearing so that the inner ring of the bearing is interference-fitted with the lead screw through the annular washer.

[0010] In one embodiment, the gap between the inner ring of the bearing and the outer peripheral wall of the lead screw is s, where 0.02mm≤s≤0.04mm.

[0011] In one embodiment, the valve needle has a mounting groove on its end face facing the lead screw. The mounting groove is stepped to form a mounting surface. The bearing abuts against the mounting surface on the side away from the protrusion. A rivet plate is provided at the opening of the mounting groove. In the riveting state, the rivet plate is riveted to the side of the bearing facing the lead screw.

[0012] In one embodiment, the wall of the mounting surface abuts against the outer ring of the bearing and is spaced apart from the inner ring of the bearing.

[0013] In one embodiment, the protrusion is arranged in a ring shape.

[0014] In one embodiment, the main body segment, the protruding segment, and the protrusion are integrally formed.

[0015] This invention also proposes an electronic expansion valve, including the valve core assembly as described above.

[0016] This utility model also proposes a refrigeration device, including the electronic expansion valve as described above.

[0017] The valve core assembly in this utility model includes a lead screw assembly, a valve needle, and a bearing. The lead screw assembly includes a lead screw, which comprises a main body section and a protruding section connected to each other. The main body section is used for transmission connection with the drive structure. A protrusion is provided on the outer peripheral wall of the lead screw, located between the main body section and the protruding section. The valve needle is coaxially arranged with the lead screw, and a mounting groove is provided on the side of the valve needle facing the lead screw. The inner ring of the bearing is limited and abuts against the protrusion on one side in the axial direction. The outer ring of the bearing is fixed to the groove wall of the mounting groove. The inner ring of the bearing is welded or interference-fitted to the lead screw assembly. Compared with the bearing in the valve core assembly of the prior art, which is installed and fixed by a preload spring and a pressure sleeve, the bearing in this application is limited by the protrusion, and then the inner ring of the bearing is welded or interference-fitted to the lead screw assembly. This reduces the number of parts in the valve core assembly, simplifies the complexity of the valve core assembly, reduces the assembly error of the valve core assembly, and improves the accuracy of the valve core assembly. Meanwhile, welding or interference fit makes the connection between the bearing and the lead screw assembly tighter and more reliable, thereby improving the connection strength between the bearing and the lead screw, and thus improving the reliability and stability of the valve core assembly. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 A schematic diagram of an embodiment of the valve core assembly provided by this utility model when the riveting plate is in its initial state;

[0020] Figure 2 A schematic diagram of an embodiment of the valve core assembly provided by this utility model when the riveting plate is in a riveting state;

[0021] Figure 3 for Figure 1 A schematic diagram of the connection between the lead screw and the bearing;

[0022] Figure 4 A schematic diagram of an embodiment of the electronic expansion valve provided by this utility model.

[0023] Explanation of icon numbers:

[0024] 10. Lead screw; 11. Main body section; 12. Extension section; 13. Protrusion; 20. Valve needle; 21. Mounting groove; 22. Mounting surface; 23. Riveting plate; 30. Bearing; 41. Valve body; 411. Valve cavity; 412. Valve port; 42. Drive assembly; 43. Nut.

[0025] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0027] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0028] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0029] Reference Figures 1 to 3 This utility model proposes a valve core assembly, comprising:

[0030] A lead screw assembly, the lead screw assembly including a lead screw 10, the lead screw 10 including a main body section 11 and an extension section 12 connected to each other, the main body section 11 being used for transmission connection with a drive structure, and the outer peripheral wall of the lead screw 10 being provided with a protrusion 13, the protrusion 13 being located between the main body section 11 and the extension section 12;

[0031] A valve needle 20 is coaxially arranged with the lead screw 10, and the valve needle 20 has a mounting groove 21 on the side facing the lead screw 10; and

[0032] The bearing 30 has its inner ring abutting against the protrusion 13 on one side in the axial direction. The outer ring of the bearing 30 is fixed to the groove wall of the mounting groove 21. The inner ring of the bearing 30 is welded or interference-fitted to the lead screw assembly.

[0033] The valve core assembly in this utility model includes a lead screw assembly, a valve needle 20, and a bearing 30. The lead screw assembly includes a lead screw 10, which includes a main body section 11 and an extension section 12 connected to each other. The main body section 11 is used for transmission connection with the drive structure. The outer peripheral wall of the lead screw 10 is provided with a protrusion 13, which is located between the main body section 11 and the extension section 12. The valve needle 20 is coaxially arranged with the lead screw 10, and the side of the valve needle 20 facing the lead screw 10 is provided with a mounting groove 21. The inner ring of the bearing 30 is limited and abuts against the protrusion 13 on one side in the axial direction. The outer ring of bearing 30 is fixed to the groove wall of mounting groove 21, and the inner ring of bearing 30 is welded or interference-fitted to the lead screw assembly. Compared with the prior art, where bearing 30 in valve core assembly is installed and fixed by preload spring and pressure sleeve, in this application, bearing 30 is limited by protrusion 13, and then the inner ring of bearing 30 is welded or interference-fitted to lead screw assembly. This reduces the number of parts in valve core assembly, simplifies the complexity of valve core assembly, reduces assembly error of valve core assembly, and improves the accuracy of valve core assembly. At the same time, welding or interference fit makes the connection between bearing 30 and lead screw assembly tighter and more reliable, thereby improving the connection strength between bearing 30 and lead screw 10, and thus improving the reliability and stability of valve core assembly.

[0034] In Embodiment 1, the inner ring of the bearing 30 is welded to the lead screw 10. The axial length of the protruding section 12 is greater than the axial length of the bearing 30, that is, the protruding section 12 protrudes from the bearing 30 in the axial direction, which facilitates the welding and fixing between the protruding section 12 and the inner ring of the bearing 30. This makes the connection between the bearing 30 and the lead screw 10 more compact and reliable, thereby improving the connection strength of the valve core assembly and thus improving the reliability and service life of the valve core assembly.

[0035] In embodiment two, the inner ring of the bearing 30 is clearance-fitted with the outer peripheral wall of the lead screw 10. The lead screw assembly also includes an annular washer, which is sleeved between the lead screw 10 and the inner ring of the bearing 30, so that the inner ring of the bearing 30 is interference-fitted with the lead screw 10 through the annular washer. The interference fit between the inner ring of the bearing 30 and the lead screw 10 achieved through the annular washer indicates that there is a gap between the lead screw 10 and the inner ring of the bearing 30, thereby reducing the precision requirements of the lead screw 10 and the inner ring of the bearing 30, thus reducing the processing cost between the lead screw 10 and the bearing 30, and improving the assembly tolerance of the valve core assembly. Simultaneously, the interference fit through the annular washer allows for a uniform distribution of radial stress, avoiding localized stress concentration caused by traditional direct interference fits, thereby improving the connection strength between the lead screw 10 and the bearing 30, and ultimately improving the reliability and service life of the valve core assembly. The annular gasket can be an elastic medium layer, which makes the connection gap between the protruding section 12 of the lead screw 10 and the annular gasket, and between the inner ring of the bearing 30 and the annular gasket smaller. This reduces the possibility of the lead screw 10 and the bearing 30 becoming loose due to the axial pull-out force of the lead screw 10 on the bearing 30, thereby making the connection between the lead screw 10 and the bearing 30 tighter and more reliable, and thus improving the stability and reliability of the valve core assembly.

[0036] The gap between the inner ring of the bearing 30 and the outer peripheral wall of the lead screw 10 is s, where 0.02mm ≤ s ≤ 0.04mm. Understandably, by setting the gap between the inner ring of the bearing 30 and the outer peripheral wall of the lead screw 10 between 0.02mm and 0.04mm, the precision requirements of the lead screw 10 and the inner ring of the bearing 30 are reduced, thereby reducing the processing cost between the lead screw 10 and the bearing 30 and improving the assembly tolerance of the valve core assembly. When the protruding section 12 of the lead screw 10 is welded to the inner ring of the bearing 30, the gap between the inner ring of the bearing 30 and the outer peripheral wall of the lead screw 10 facilitates the entry of solder, thereby increasing the welding area between the bearing 30 and the lead screw 10, and thus improving the connection strength and service life of the valve core assembly. When the protruding section 12 of the lead screw 10 and the inner ring of the bearing 30 are interference-fitted by an annular gasket, the gap facilitates the insertion of the annular gasket between the protruding section 12 of the lead screw 10 and the inner ring of the bearing 30, thereby facilitating the assembly of the valve core assembly.

[0037] The method for measuring 's' involves using specialized measuring tools to measure the diameters D1 and D2 of the inner ring of bearing 30 and the protruding section 12 of lead screw 10, respectively. The value of (D1-D2) / 2 is then 's'. These specialized tools can include calipers, laser measuring instruments, inside diameter gauges, micrometers, etc.

[0038] In one embodiment, the valve needle 20 has a mounting groove 21 on its end face facing the lead screw 10. The mounting groove 21 is stepped to form a mounting surface 22. The bearing 30 abuts against the mounting surface 22 on the side facing away from the protrusion 13. A riveting plate 23 is provided at the opening of the mounting groove 21. In the riveting state, the riveting plate 23 is riveted to the side of the bearing 30 facing the lead screw 10. When the riveting plate 23 is in the initial state, it extends along the axial direction of the nut 43. That is, in the actual production process, only the depth of the mounting groove 21 needs to be increased. When the bearing 30 is installed in the mounting groove 21 and abuts against the mounting surface 22, the opening of the mounting groove 21 needs to be higher than the bearing 30 to complete the production process of the riveting plate 23. This simplifies the processing technology of the riveting plate 23 and reduces the manufacturing cost of the valve needle 20. Meanwhile, the method of riveting the bearing 30 by the riveting plate 23 is simple and convenient, and the connection strength is high, which facilitates the installation and fixation between the bearing 30 and the valve needle 20, improves the connection strength between the bearing 30 and the valve needle 20, and thus improves the stability and reliability of the valve core assembly.

[0039] Specifically, the wall surface of the mounting surface 22 abuts against the outer ring of the bearing 30 and is spaced apart from the inner ring of the bearing 30. Because the technical solution of this application uses a welding or interference fit connection method, the connection strength between the inner ring of the bearing 30 and the lead screw 10 is high. Therefore, by abutting the wall surface of the mounting surface 22 against the outer ring of the bearing 30 and spaced apart from the inner ring of the bearing 30, the mounting surface 22 does not need to abut against the end face of the entire bearing 30 facing the valve port 412 to meet the installation strength requirements of the bearing 30. This reduces the area of ​​the mounting surface 22, thereby reducing the material used in the production of the valve needle 20 and lowering the manufacturing cost of the valve needle 20.

[0040] Furthermore, the protrusion 13 is arranged in a ring shape. By arranging the protrusion 13 in a ring shape, the contact area between the protrusion 13 and the bearing 30 is increased, thereby increasing the stability of the contact between the protrusion 13 and the bearing 30, reducing the possibility of deformation of the protrusion 13, and thus improving the service life of the lead screw 10 and the stability and reliability of the valve core assembly.

[0041] Specifically, the main body section 11, the extended section 12, and the protrusion 13 are integrally formed, thereby improving the structural strength of the lead screw 10 and thus increasing its service life. The integral forming of the main body section 11, the extended section 12, and the protrusion 13 can be achieved through casting, welding, or direct cutting to a predetermined shape.

[0042] Reference Figure 4This invention also proposes an electronic expansion valve, which includes a valve body 41, a drive assembly 42, a nut 43, and a valve core assembly. The valve body 41 has a communicating valve cavity 411 and a valve port 412. The drive assembly 42 includes a coil and a rotor. The coil is installed in the valve body 41 but not in the valve cavity 411. One end of the lead screw 10 is fixed to the rotor, and the other end is rotatably connected to the valve needle 20 through a bearing 30. The inner ring of the bearing 30 is clearance-fitted with the lead screw 10, and the outer ring is interference-fitted with the valve needle 20 or welded to it. The bearing 30 is fixed to the end of the lead screw 10 away from the rotor. By applying a certain regular electrical pulse to the coil, the rotor is excited to rotate, thereby driving the lead screw 10 to rotate and move up and down within the nut 43 assembly, thereby driving the valve needle 20 to open and close the valve port 412. By opening and closing the valve needle 20 and the valve port 412, the electronic expansion valve can be switched on and off and the flow rate can be regulated. The specific structure of the valve core assembly is as described in the above embodiments. Since this electronic expansion valve adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.

[0043] This utility model also proposes a refrigeration device, which can be divided into compression refrigeration devices, absorption refrigeration devices, vapor jet refrigeration devices, heat pump refrigeration devices, and electric heating refrigeration devices, etc. The refrigeration device mainly includes a motor, compressor, electronic expansion valve, evaporator, condenser, accessories, and piping. Examples include refrigerators and air conditioners. The specific structure of the electronic expansion valve is as described in the above embodiments. Since the refrigeration device in this utility model adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated further here.

[0044] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A valve core assembly, characterized in that, include: A lead screw assembly includes a lead screw, which includes a main body section and an extension section connected to each other. The main body section is used for transmission connection with a drive structure. The outer peripheral wall of the lead screw is provided with a protrusion, which is located between the main body section and the extension section. A valve needle, coaxially arranged with the lead screw, and having a mounting groove on the side of the valve needle facing the lead screw; and The bearing has its inner ring abutting against the protrusion on one side in the axial direction, its outer ring fixed to the wall of the mounting groove, and its inner ring welded or interference-fitted to the lead screw assembly.

2. The valve core assembly as claimed in claim 1, characterized in that, The inner ring of the bearing is welded to the lead screw, and the axial length of the extended section is greater than the axial length of the bearing.

3. The valve core assembly as claimed in claim 1, characterized in that, The inner ring of the bearing is clearance-fitted with the outer peripheral wall of the lead screw. The lead screw assembly also includes an annular washer, which is sleeved between the lead screw and the inner ring of the bearing so that the inner ring of the bearing is interference-fitted with the lead screw through the annular washer.

4. The valve core assembly as described in any one of claims 1 to 3, characterized in that, The gap between the inner ring of the bearing and the outer peripheral wall of the lead screw is s, where 0.02mm≤s≤0.04mm.

5. The valve core assembly as claimed in claim 1, characterized in that, The mounting groove is stepped to form a mounting surface. The side of the bearing away from the protrusion abuts against the mounting surface. A rivet plate is provided at the opening of the mounting groove. In the riveting state, the rivet plate is riveted to the side of the bearing facing the lead screw.

6. The valve core assembly as claimed in claim 5, characterized in that, The wall of the mounting surface abuts against the outer ring of the bearing and is spaced apart from the inner ring of the bearing.

7. The valve core assembly as claimed in claim 1, characterized in that, The protrusions are arranged in a ring shape.

8. The valve core assembly as claimed in claim 1, characterized in that, The main body section, the protruding section, and the protrusion are integrally formed.

9. An electronic expansion valve, characterized in that, Includes the valve core assembly as described in any one of claims 1 to 8.

10. A refrigeration device, characterized in that, Includes the electronic expansion valve as described in claim 9.

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