Valve needle assembly and electronic expansion valve

Abstract

The utility model provides a valve needle assembly and an electronic expansion valve, and the valve needle assembly comprises a valve needle, a valve rod and a valve rod, the valve rod is mounted in the mounting groove through a bearing, and the bearing is movably arranged on the valve rod in a sleeving manner; a boss part and a limiting check ring are arranged on the valve rod, and the boss part is closer to the valve needle than the limiting check ring; the valve rod is sleeved with an elastic piece, one end of the elastic piece abuts against the end, away from the boss part, of the inner ring of the bearing, and the other end of the elastic piece abuts against the limiting check ring. The limiting check ring is detachably connected with the valve rod. A bearing is arranged between the valve rod and the valve needle, and abrasion between the valve needle and the valve port is reduced. The boss part and the valve rod can be integrally machined and formed, the machining difficulty is low, the elastic piece is limited through the limiting check ring, and the cost of the limiting check ring is very low. During assembly, only the bearing, the elastic piece and the limiting check ring need to be sequentially arranged on the valve rod in a sleeving mode, assembly is labor-saving, and the assembly time is short.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of electronic expansion valve, especially relates to a valve needle subassembly and electronic expansion valve. BACKGROUND

[0002] The electronic expansion valve is utilized the principle of step motor, rotates through coil drive magnetic rotor, and rotation movement of magnetic rotor is converted into axial movement of valve rod, and the valve rod drives the valve needle connected with it to ascend or descend, thereby controlling the flow size of the electronic expansion valve.

[0003] The electronic expansion valve mainly includes rotor, valve rod, nut and valve needle, wherein, the valve rod is rotationally connected with the nut, the valve needle is arranged at the lower end of the valve rod, the rotor drives the valve rod to move axially, and further drives the valve needle to move axially, so as to realize the purpose of plugging and opening the valve port. UTILITY MODEL CONTENTS

[0004] In view of the above-mentioned defects of the prior art, the purpose of the utility model is to provide a valve needle subassembly and electronic expansion valve, which are used to solve the problems that the valve needle rotates relative to the valve port and is abraded when plugging or opening the valve port in the prior art.

[0005] To achieve the above-mentioned purpose and other related purposes, on one hand, the utility model provides a valve needle subassembly, which comprises:

[0006] A valve needle, wherein an installation groove is arranged on the valve needle;

[0007] A valve rod, wherein one end of the valve rod close to the valve needle is installed in the installation groove of the valve needle through a bearing, the inner ring of the bearing is movably sleeved on the valve rod, and the outer ring of the bearing is installed in the installation groove;

[0008] A boss part, which is arranged on the valve rod, and can abut on the end face of the inner ring of the bearing close to the valve needle when the valve rod moves axially upward, and the boss part is integrally formed with the valve rod;

[0009] A limiting check ring, which is detachably connected on the valve rod, and the boss part is closer to the valve needle than the limiting check ring;

[0010] An elastic piece, which is sleeved on the valve rod, one end of the elastic piece abuts on the end of the inner ring of the bearing away from the boss part, and the other end of the elastic piece abuts on the limiting check ring.

[0011] Further, the boss part is located at the end of the valve rod close to the valve needle.

[0012] Further, a clamping groove is arranged on the valve rod, and the limiting stop ring is clamped in the clamping groove.

[0013] Further, the limiting stop ring is a clamping ring or an open stop ring.

[0014] Further, the limiting stop ring is an E-shaped open stop ring.

[0015] Further, a limiting step is arranged in the mounting groove, and an end face of the outer ring of the bearing close to one end of the valve needle is in contact with the limiting step.

[0016] In another aspect, the application further provides an electronic expansion valve, comprising the valve needle assembly, a nut assembly and a valve body, the valve rod is in threaded connection with the nut assembly, the nut assembly is installed on the valve body, and the valve body is provided with a groove close to one end of the nut assembly, and the nut assembly is located in the groove.

[0017] Further, the nut assembly is in interference fit with the groove.

[0018] Further, a valve seat is further included, and the valve body is installed on the valve seat.

[0019] As described above, the application has the following beneficial effects: firstly, the application sets the bearing between the valve needle and the valve rod, so that the valve needle will not relatively rotate with the valve port of the electronic expansion valve when the valve rod drives the valve needle to move up and down in the axial direction, thereby reducing the abrasion between the valve needle and the valve port. The boss part is integrally machined with the valve rod, the machining process of the boss part is consistent with that of the valve rod, and the material of the boss part is also consistent with that of the valve rod, so that the boss part does not need to be machined by using additional materials. The application sets the detachable limiting stop ring, which is used for limiting the elastic member, so that the precision of the limiting stop ring does not need to be high, and the limiting stop ring can be connected with the valve rod and fixed, and the cost of the limiting stop ring is relatively low. When the application is assembled, the bearing is only needed to be sleeved on the valve rod, then the elastic member is installed, and finally the limiting stop ring is fixed on the valve rod, so that the assembly is labor-saving and the assembly time is short. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 A structure schematic view of the valve needle assembly is provided for the application.

[0021] Figure 2 A structure schematic view of the electronic expansion valve is provided for the application.

[0022] PART NUMBER EXPLANATION

[0023] Sleeve 1, coil assembly 2, rotor assembly 3, driving tab 4, moving spring 5, fixed spring 6, nut assembly 7, valve needle assembly 8, valve needle 81, first end 811, second end 812, mounting groove 813, first section 814, second section 815, limiting step 816, valve stem 82, boss part 821, clamping groove 822, limiting stop ring 83, elastic member 84, bearing 85, valve body 9, recess 91, outer seal 10, inner seal 11, valve seat 12, inlet 121, outlet 122. DETAILED DESCRIPTION

[0024] The implementation of the present application will be described below by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the present specification.

[0025] It should be understood that the structures, proportions, sizes, etc. shown in the drawings attached to the present specification are only used to understand and read the content disclosed in the present specification by those skilled in the art, and are not used to limit the implementation conditions of the present application, so they do not have technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are only for the convenience of clear description, and are not used to limit the scope of the present application. The change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the scope of the present application.

[0026] In order to be able to describe the present application in detail, first, the valve needle assembly and the electronic expansion valve of the present application will be described in detail.

[0027] As shown in Figure 1 The present application provides a valve needle assembly 8, which comprises a valve needle 81 and a valve stem 82, and the valve needle 81 and the valve stem 82 are connected through a bearing 85.

[0028] The valve needle 81 comprises a first end 811 and a second end 812, the first end 811 is used for detachably mounting on the valve port of the electronic expansion valve, and the first end 811 moves up and down relative to the valve port of the electronic expansion valve to control the flow size of the electronic expansion valve. The second end 812 is provided with a mounting groove 813, and the bearing 85 is mounted in the mounting groove 813, the outer ring of the bearing 85 is mounted in the mounting groove 813, and the inner ring of the bearing 85 is movably sleeved on the valve stem 82. The valve stem 82 is provided with a boss part 821 at one end close to the valve needle 81, and when the valve stem 82 moves axially upward, the boss part 821 can abut on the end face of the inner ring of the bearing 85 close to the valve needle 81.

[0029] The outer wall of the valve rod 82 is in contact with the inner ring of the bearing 85, and the circumferential rotation of the valve rod 82 drives the rotation of the inner ring of the bearing 85. The outer ring of the bearing 85 is in contact with the inner wall of the mounting groove 813 of the valve needle 81. The inner ring and the outer ring of the bearing 85 can move independently, so that the valve rod 82 can move axially upward and downward and rotate circumferentially during use. After the valve rod 82 is connected to the valve needle 81 through the bearing 85, the valve needle 81 only moves axially upward and downward along the valve rod 82 and does not rotate circumferentially. Therefore, the valve needle 81 does not rotate circumferentially relative to the valve port, thereby reducing the wear between the valve needle 81 and the valve port.

[0030] The boss portion 821 is arranged at the lower part of the bearing 85 and is integrally formed with the valve rod 82, without the need for additional materials for processing. The side of the boss portion 821 in contact with the bearing 85 only needs to be processed into a smooth plane and does not need to be processed into multiple segments of different sizes.

[0031] In some embodiments, the boss portion 821 can be arranged at the middle part of the valve rod 82, and the valve rod 82 further has a small length at the lower part of the boss portion 821.

[0032] In some embodiments, the boss portion 821 is located at the end of the valve rod 82 close to the valve needle 81, thereby reducing the length of the valve rod 82.

[0033] When the valve needle 81 seals the valve port, a pre-tightening force needs to be provided to the valve needle 81, so that the response speed is fast when the valve needle 81 moves away from the valve port. Therefore, when the valve needle 81 is behind the valve port, the valve rod 82 needs to move downward by a certain distance, and an elastic member 84 is generally arranged to provide a pre-tightening force to the valve needle 81. One end of the elastic member 84 abuts against the inner ring of the bearing 85 away from the boss portion 821, and a detachable limiting stop ring 83 is arranged on the valve rod 82. The other end of the elastic member 84 abuts against the limiting stop ring 83, and the limiting stop ring 83 is spaced apart from the boss portion 821 along the axial direction of the valve rod 82, that is, the limiting stop ring 83 is spaced apart from the boss portion 821 by a certain distance. The outer ring of the bearing 85 is connected to the inner wall of the mounting groove 813. The elastic member 84 is sleeved on the valve rod 82 and located between the limiting stop ring 83 and the bearing 85.

[0034] The main function of the limiting stop ring 83 is to limit the position of the elastic member 84, and the limiting stop ring 83 is detachably arranged on the valve rod 82.

[0035] In the design of electronic expansion valves, the main function of the limiting stop ring 83 is to effectively position the elastic member 84. In order to adapt to different application scenarios and production needs, the fixing mode of the limiting stop ring 83 can be flexibly selected according to actual conditions.

[0036] In some embodiments, the limiting stop ring 83 can be bolted to the valve stem 82. By machining a plurality of threaded holes in advance on the valve stem 82, the installation of the limiting stop ring 83 can be easily completed using standard bolts, which requires drilling threaded holes on the valve stem 82.

[0037] In some embodiments, the limiting stop ring 83 can also be a clamp. The clamp is a type of annular fastener that can be quickly and easily installed on the valve stem 82 without any modification to the valve stem 82 itself. This design significantly simplifies the assembly process and reduces manufacturing costs. The clamp is usually made of a material with a certain elasticity, which can tightly wrap around the valve stem 82 while not hindering the normal operation of the valve stem 82.

[0038] In some embodiments, the elastic member 84 is limited by an open ring with a small opening, which can be slid into the valve stem 82 through the opening and locked in place by the elastic closure of the open ring itself. Similar to the clamp, the open ring also does not require drilling or tapping on the valve stem 82, so it is very suitable for those who want to further optimize production efficiency. In addition, the open ring is small in size and easy to operate. The open ring can adopt an E-shaped open ring, which has better clamping effect and low cost.

[0039] In order to limit the limiting stop ring 83 from sliding relative to the valve stem 82, a clamping groove 822 is provided on the valve stem 82, above the bearing 85. After the elastic member 84 is installed, the limiting stop ring 83 is clamped into the clamping groove 822, and the upper and lower end faces of the clamping groove 822 limit the limiting stop ring 83, so that the limiting stop ring 83 cannot move. Clamping the limiting stop ring 83 into the clamping groove 822 actually forms a physical barrier, effectively preventing any movement of the limiting stop ring 83 along the valve stem 82 in the axial direction. The upper and lower end faces of the clamping groove 822 provide double insurance, not only limiting the possibility of the limiting stop ring 83 coming out upwards from above, but also providing firm support from below to ensure that the limiting stop ring 83 does not move downwards. This greatly improves the overall stability of the valve core assembly, ensuring that the limiting stop ring 83 remains in place even under extreme conditions, thereby ensuring the long-term reliable operation of the electronic expansion valve.

[0040] The connection and disconnection between the open blocking ring and the clamping groove 822 are very convenient. During installation, only need to align the opening with the valve stem 82, then slide along the valve stem 82 to the clamping groove 822 position, and finally release the open blocking ring, so that it naturally closes and clamps into the clamping groove 822. This process almost does not need to use any tools, greatly simplifying the assembly process. Once the open blocking ring is clamped into the clamping groove 822, its design ensures that the blocking ring can be firmly fixed in place and will not loosen or fall off due to vibration or external force. The shape and size of the clamping groove 822 match the open blocking ring, providing reliable positioning and ensuring the correct position of the limiting blocking ring 83 and the elastic member 84. When maintenance or replacement of parts is required, the open blocking ring can also be easily removed from the clamping groove 822. Usually only need to use a screwdriver or other tools to gently pry one side of the open blocking ring, so that the open blocking ring opens and slides out of the clamping groove 822.

[0041] The open blocking ring is usually made of materials with good elasticity and durability, such as spring steel.

[0042] The elastic member 84 can be a coil spring, and the elastic member 84 can also be a spring sheet, an elastic rubber sleeve or an elastic silica gel sleeve.

[0043] The installation groove 813 includes a first section 814 and a second section 815, the inner diameter of the first section 814 is larger than that of the second section 815, and the second section 815 is closer to the first end 811 of the valve needle 81 than the first section 814. The connection between the first section 814 and the second section 815 forms a limiting step 816, and the outer ring of the bearing 85 is in contact with the limiting step 816. The first section 814 is used to accommodate the bearing 85, and the larger inner diameter ensures that the bearing 85 can be smoothly installed.

[0044] Compared with the first section 814, the inner diameter of the second section 815 is smaller, and the purpose of this design is to provide a space for the valve stem 82 to move freely without interference during work.

[0045] The connection between the first section 814 and the second section 815 forms a limiting step 816, which provides the necessary support for the bearing 85. The outer ring of the bearing 85 is placed on the limiting step 816, thereby providing positioning and support for the bearing 85. The limiting step 816 only contacts the outer ring of the bearing 85 and does not interfere with the inner ring of the bearing 85, ensuring the free rotation of the inner balls or rollers of the bearing 85, reducing the rotation resistance and prolonging the service life.

[0046] The limiting step 816 not only provides stable support for the bearing 85, but also limits the bearing 85 to avoid deviation in work. At the same time, the second section 815 of the installation groove 813 provides sufficient space for the valve stem 82 to move downward after the valve needle 81 blocks the valve port, until the end of the valve stem 82 contacts the valve needle 81.

[0047] When the valve needle 81 contacts the valve port, the valve stem 82 continues to move downward, and the elastic element 84 installed on the outside of the valve stem 82 begins to be compressed. When the elastic element 84 is compressed in place, it stores a certain potential energy and provides sufficient pre-tightening force to the valve needle 81. This pre-tightening force is crucial to ensure a good seal between the valve needle 81 and the valve port, and also provides power for the rapid reset of the valve needle 81. When the valve needs to be opened, the compressed elastic element 84 can quickly push the valve needle 81 away from the valve port to achieve fast response.

[0048] When the valve core assembly is assembled, the bearing 85 is first sleeved on the valve stem 82 from the end away from the boss part 821, then the elastic element 84 is sleeved on the valve stem 82, and then the limiting retainer ring 83 is clamped into the clamping groove 822, and the elastic element 84 is located between the upper end face of the bearing 85 and the limiting retainer ring 83. Then the bearing 85 is installed into the installation groove 813 of the valve needle 81. The limiting retainer ring 83 can be an open retainer ring with very low cost, without additional processing, and the cost is also very low. When the valve stem 82 moves axially upward, the boss part 821 can abut on the end face of the inner ring of the bearing 85 near the end of the valve needle 81, and the valve stem 82 drives the valve needle 81 to move upward, and when the valve stem 82 moves downward, the bottom of the boss part 821 abuts with the bottom of the installation groove 813, thereby driving the valve needle 81 to move downward.

[0049] On the other hand, as shown in Figure 2 The present application also provides an electronic expansion valve, which comprises the above-mentioned valve needle assembly 8, and further comprises a sleeve 1, a coil assembly 2, a rotor assembly 3, a driving sheet 4, a dynamic spring 5, a static spring 6, a nut assembly 7, a valve body 9 and a valve seat 12. The valve stem 82 is threadedly connected with the nut assembly 7, and the nut assembly 7 is installed on the valve body 9.

[0050] The valve body 9 is provided with a recess 91 at one end close to the nut assembly 7, and the nut assembly 7 is located in the recess 91. The nut assembly 7 is in interference fit with the recess 91.

[0051] The sleeve 1 is welded and fixed on the valve body 9, the valve body 9 is threadedly connected with the valve seat 12, and the outer leakage passage between the valve body 9 and the valve seat 12 is sealed by an outer sealing element 10, and the inner leakage passage between the valve body 9 and the valve seat 12 is sealed by an inner sealing element 11.

[0052] The nut assembly 7 is interference fitted on the valve body 9, the dynamic spring 5 and the fixed spring 6 are sleeved on the nut assembly 7, and the lower end of the fixed spring 6 is fixed on the nut assembly 7. The guide vane 4 is welded and fixed on the rotor assembly 3, and the guide vane 4 pushes the dynamic spring 5 to rotate on the track of the fixed spring 6.

[0053] The rotor assembly 3 is welded and fixed on the valve rod 82 of the valve needle assembly 8, and the coil assembly 2 is sleeved on the sleeve 1. The valve needle 81 moves upward to leave the valve port, and the refrigerant flows into from the inlet 121 and flows out from the outlet 122 through the valve port.

[0054] The above embodiment only illustrates the principle and effect of the utility model, and is not used to limit the utility model. Any person skilled in the art can modify or change the above embodiment without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. A valve needle assembly, characterized in that The valve needle comprises: a valve needle provided with a mounting groove; a valve rod, one end of which is mounted in the mounting groove of the valve needle through a bearing, the inner ring of the bearing is movably sleeved on the valve rod, and the outer ring of the bearing is fixedly mounted in the mounting groove; a boss portion provided on the valve rod, which can abut on the end face of the inner ring of the bearing close to the valve needle when the valve rod moves axially upward, and the boss portion is integrally formed with the valve rod; a limiting retainer ring, which is detachably connected to the valve rod, and the boss portion is closer to the valve needle than the limiting retainer ring; an elastic member, which is sleeved on the valve rod, one end of the elastic member abuts on the end of the inner ring of the bearing away from the boss portion, and the other end of the elastic member abuts on the limiting retainer ring.

2. The valve needle assembly of claim 1, wherein The boss portion is located at the end of the valve rod close to the valve needle.

3. The valve needle assembly of claim 1, wherein The valve rod is provided with a clamping groove, and the limiting retainer ring is clamped in the clamping groove.

4. The valve needle assembly of claim 3, wherein The limiting retainer ring is a clamp or an open retainer ring.

5. The valve needle assembly of claim 4, wherein, The limiting retainer ring is an E-shaped open retainer ring.

6. The valve needle assembly of any of claims 1-5, wherein, The mounting groove is provided with a limiting step, and the end face of the outer ring of the bearing close to the valve needle is in contact with the limiting step.

7. An electronic expansion valve characterized by The valve needle assembly comprises the valve needle assembly of any one of claims 1-6, further comprising a nut assembly and a valve body, the valve rod is threadedly connected with the nut assembly, the nut assembly is mounted on the valve body, the valve body is provided with a recess close to one end of the nut assembly, and the nut assembly is located in the recess.

8. The electronic expansion valve according to claim 7, characterized in that The nut assembly is in interference fit with the recess.

9. The electronic expansion valve according to claim 7, wherein Further comprising a valve seat, and the valve body is mounted on the valve seat.

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