Bearing mounting structure of electronic expansion valve

Abstract

The utility model relates to a bearing installation structure of an electronic expansion valve, which comprises a bearing structure arranged between an inner valve needle and a screw rod, the bearing structure comprises a bearing retainer ring, a bearing and an inner ring retainer ring, the inner valve needle is provided with an inner cavity, the bearing is embedded and installed at the upper port of the inner cavity, and the inner ring retainer ring is embedded and installed at the lower port of the inner cavity. A bearing check ring is installed at the position, located on the outer side of the inner cavity, of the upper end of the inner valve needle and used for limiting an outer ring of the bearing, one end of the screw sequentially penetrates through the bearing check ring and the bearing to be inserted into the inner cavity, an inner ring check ring is arranged at the end of the screw, the screw is sleeved with a pre-tightening spring and a shaft sleeve, one end of the pre-tightening spring is connected with the screw in a limiting mode, and the other end of the pre-tightening spring is connected with the shaft sleeve. The other end of the pre-tightening spring abuts against the shaft sleeve, and one end of the shaft sleeve abuts against the inner ring of the bearing. The inner valve needle and the screw rod are stably connected, and the whole bearing is convenient to assemble and stable in structure.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic expansion valves, in particular to a bearing installation structure of an electronic expansion valve. Background Art

[0002] In air conditioners, refrigerators, heat pump water heaters and other types of refrigeration and heating equipment, electronic expansion valves are usually used to regulate the flow of fluids. On the market, there are already some electronic expansion valves using double valve needles. The structure can refer to patents such as CN219954239U and CN216742912U. The inner valve needle assembly in the electronic expansion valve includes an inner valve needle body. The inner valve needle body is hollow. A small valve needle that slides up and down and a spring that assists the small valve needle in resetting are installed in the inner valve needle body. The upper part of the inner valve needle body is rotatably connected to the screw through a bearing. The above-mentioned inner valve needle assembly has a complex structure and is difficult to process. For this reason, an integrated inner valve needle is designed, which can be referred to. Figure 3 As shown, the bearing connection structure between the inner valve needle and the screw is of utmost importance, and there is currently no corresponding installation structure. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a bearing installation structure of an electronic expansion valve to stably connect an inner valve needle and a screw rod, and the whole bearing is easy to assemble and has a stable structure.

[0004] The utility model solves the technical problem by adopting the following technical scheme: providing a bearing installation structure of an electronic expansion valve, comprising a bearing structure arranged between an inner valve needle and a screw rod, the bearing structure comprising a bearing retaining ring, a bearing and an inner ring retaining ring, the inner valve needle having an inner cavity, an upper port of the inner cavity being embedded and installed with a bearing, the upper end of the inner valve needle being located outside the inner cavity and being installed with a bearing retaining ring, the bearing retaining ring being used for limiting the outer ring of the bearing, one end of the screw rod sequentially passing through the bearing retaining ring and the bearing and being inserted into the inner cavity and an inner ring retaining ring being arranged at the end thereof, a preload spring and a shaft sleeve being sleeved on the screw rod, one end of the preload spring being connected to the screw rod for limiting, the other end of the preload spring supporting the shaft sleeve, and one end of the shaft sleeve supporting the inner ring of the bearing.

[0005] As a supplement to the technical solution described in the utility model, a circle of annular protrusions is arranged on the upper end of the inner valve needle around the upper port of the inner cavity, and the bearing retaining ring is sleeved outside the annular protrusion. The bearing retaining ring and the annular protrusion are riveted together and fixed together by welding.

[0006] As a supplement to the technical solution described in the utility model, the screw rod and the inner ring retaining ring are riveted together and fixed together by welding.

[0007] As a supplement to the technical solution of the utility model, a circle of steps is arranged on the screw rod, and the step supports one end of the preload spring.

[0008] As a supplement to the technical solution described in the utility model, a slot is provided at the upper end of the inner cavity, and the bearing is installed in the slot, and the outer ring of the bearing is tightly fitted with the inner wall of the slot.

[0009] Beneficial effects: The utility model relates to a bearing mounting structure of an electronic expansion valve, in which the bearing is mounted in an inner cavity where an inner valve needle is arranged, the outer ring of the bearing is tightly fitted with the inner hole, the outer side of the bearing is limited by a bearing retaining ring, the inner ring of the bearing is fitted with the sleeve, and a preload spring arranged on the screw supports the sleeve. A certain upper and lower movable gap is arranged between the sleeve and the screw, the lower end of the screw is connected and fixed to the inner ring retaining ring, the inner ring retaining ring is fitted with the inner ring of the bearing, and the bearing moves with the rotation of the screw, thereby reducing friction and extending service life. The entire bearing is easy to assemble and has a stable structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the utility model;

[0011] Figure 2 This utility model Figure 1 A partial enlarged view of the middle A;

[0012] Figure 3 It is a structural schematic diagram of the inner valve needle described in the utility model.

[0013] Illustration: 1. Outer valve needle, 2. Inner valve needle, 3. Bearing retaining ring, 4. Preload spring, 5. Screw, 6. Step, 7. Bushing, 8. Bearing, 9. Inner ring retaining ring, 10. Inner cavity, 11. Sealing part, 12. Opening, 13. Slot, 14. Annular protrusion, 15. Side hole. DETAILED DESCRIPTION

[0014] The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

[0015] The embodiment of the utility model relates to a bearing mounting structure of an electronic expansion valve, such as Figure 1-3As shown, the electronic expansion valve includes a double valve needle assembly, a magnetic rotor assembly and a valve seat assembly. When the electronic expansion valve starts to work, the magnetic rotor assembly rotates under the action of the excitation magnetic field, thereby driving the screw 5 to rotate, and further driving the double valve needle assembly to move, so as to realize the change of the opening of the valve port of the electronic expansion valve, thereby achieving the purpose of regulating the flow and pressure of the fluid medium; the double valve needle assembly includes an outer valve needle 1 and an inner valve needle 2, the outer valve needle 1 is provided with an opening 12 at the bottom, and the lower part of the outer valve needle 1 is provided with a side hole 15 connected with the opening 12, the outer valve needle 1 is installed with an inner valve needle 2 that slides up and down, and the lower end of the inner valve needle 2 is provided with a sealing portion 11 that cooperates with the opening 12, and the movement of the outer valve needle 1 and the inner valve needle 2 is used to realize the switching and regulation of the large and small flow rates of the electronic expansion valve.

[0016] When the screw 5 rotates, the inner valve needle 2 will move upward with the screw 5, and the outer valve needle 1 is kept stationary by the valve needle spring. The inner valve needle 2 and the axial movement of the sealing part 11 open the opening 12, and the medium enters from the opening 12 and then passes through the side hole 15. The gap between the sealing surface of the sealing part 11 and the sealing surface of the opening 12 is changed by controlling the up and down movement of the inner valve needle 2, so as to achieve the effect of regulating a small flow rate; when the upper end of the inner valve needle 2 presses against the outer valve needle 1, as the screw 5 rotates, the outer valve needle 1 will move upward with the inner valve needle 2, and the gap between the sealing surface of the lower end of the outer valve needle 1 and the sealing surface of the valve port is changed by controlling the up and down movement of the outer valve needle 1, so as to achieve the effect of regulating a large flow rate.

[0017] A bearing structure is arranged between the inner valve needle 2 and the screw rod 5, and the bearing structure comprises a bearing retaining ring 3, a bearing 8 and an inner ring retaining ring 9. The inner valve needle 2 has an inner cavity 10, and the bearing 8 is embedded and installed at the upper port of the inner cavity 10. The upper end of the inner valve needle 2 is located outside the inner cavity 10 and is installed with a bearing retaining ring 3, and the bearing retaining ring 3 is used to limit the outer ring of the bearing 8. One end of the screw rod 5 passes through the bearing retaining ring 3 and the bearing 8 in turn and is inserted into the inner cavity 10, and an inner ring retaining ring 9 is arranged on the end. A preload spring 4 and a sleeve 7 are sleeved on the screw rod 5, and one end of the preload spring 4 is connected to the screw rod 5 for limiting position, and the other end of the preload spring 4 supports the sleeve 7, and one end of the sleeve 7 passes through the bearing retaining ring 3 to support the inner ring of the bearing 8.

[0018] The utility model installs the bearing 8 in the inner cavity 10 set in the inner valve needle 2, the outer ring of the bearing 8 is tightly matched with the inner hole, the outer side of the bearing 8 is limited by the bearing retaining ring 3, the inner ring of the bearing 8 is fitted with the shaft sleeve 7, the preload spring 4 set on the screw 5 supports the shaft sleeve 7, and a certain upper and lower movable gap is set between the shaft sleeve 7 and the screw 5. The lower end of the screw 5 is connected and fixed with the inner ring retaining ring 9, and the inner ring retaining ring 9 is fitted with the inner ring of the bearing 8. The bearing 8 moves with the rotation of the screw 5, thereby reducing friction, extending the service life, being easy to assemble, and having a stable structure.

[0019] Reference Figure 3 As shown, as the installation instructions of the bearing retaining ring 3, the upper end of the inner valve needle 2 is arranged with a circle of annular protrusions 14 around the upper port of the inner cavity 10, and the bearing retaining ring 3 is sleeved outside the annular protrusion 14. The bearing retaining ring 3 and the annular protrusion 14 are riveted and fixed together by welding, which can effectively ensure the connection strength and structural stability between the two.

[0020] Reference Figure 1 As shown, as the installation instructions of the inner ring retaining ring 9, the screw 5 and the inner ring retaining ring 9 are riveted together and fixed together by welding, which can effectively ensure the connection strength and structural stability between the two.

[0021] Reference Figure 2 As shown, as a specific description of the upper limit of the preload spring 4, a circle of steps 6 are arranged on the screw rod 5, and the step 6 supports one end of the preload spring 4 to achieve the limit of the preload spring 4.

[0022] Reference Figure 3 As shown, as an installation instruction for the bearing 8 , a slot 13 is provided at the upper end of the inner cavity 10 , and the bearing 8 is installed in the slot 13 , and the outer ring of the bearing 8 is tightly fitted with the inner wall of the slot 13 .

[0023] During installation, first, the preload spring 4, the sleeve 7, the bearing retaining ring 3, the bearing 8 and the inner ring retaining ring 9 are sequentially inserted into the screw rod 5, then the screw rod 5 and the inner ring retaining ring 9 are riveted together and fixed by welding, then the sleeve 7 is installed into the slot 13, the outer ring of the bearing 8 is tightly fitted with the inner wall of the slot 13, and then the bearing retaining ring 3 is sleeved on the outside of the annular protrusion 14, the bearing retaining ring 3 and the annular protrusion 14 are riveted together and fixed by welding, the upper end of the preload spring 4 is supported by the step 6, the lower end of the preload spring 4 is supported by the sleeve 7, one end of the sleeve 7 passes through the bearing retaining ring 3 and supports the inner ring of the bearing 8, so that the installation and fixation of the entire bearing is realized, the assembly is convenient, and the processing difficulty is relatively low.

[0024] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0025] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0026] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0027] The above is a detailed introduction to the bearing mounting structure of an electronic expansion valve provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A bearing mounting structure for an electronic expansion valve, comprising a bearing structure arranged between an inner valve needle (2) and a screw (5), characterized in that: The bearing structure comprises a bearing retaining ring (3), a bearing (8) and an inner ring retaining ring (9); the inner valve needle (2) has an inner cavity (10), and the bearing (8) is embedded and installed at the upper end of the inner cavity (10); the upper end of the inner valve needle (2) is located outside the inner cavity (10) and is installed with a bearing retaining ring (3); the bearing retaining ring (3) is used to limit the outer ring of the bearing (8); one end of the screw rod (5) passes through the bearing retaining ring (3) and the bearing (8) in sequence and is inserted into the inner cavity (10) and an inner ring retaining ring (9) is arranged at the end; a preload spring (4) and a shaft sleeve (7) are sleeved on the screw rod (5); one end of the preload spring (4) is connected to the screw rod (5) in a limiting manner, and the other end of the preload spring (4) supports the shaft sleeve (7); one end of the shaft sleeve (7) supports the inner ring of the bearing (8).

2. The bearing mounting structure of an electronic expansion valve according to claim 1, characterized in that: The upper end of the inner valve needle (2) is provided with a circle of annular protrusions (14) around the upper port of the inner cavity (10), and the bearing retaining ring (3) is sleeved outside the annular protrusion (14). The bearing retaining ring (3) and the annular protrusion (14) are riveted together and fixed together by welding.

3. The bearing mounting structure of an electronic expansion valve according to claim 1, characterized in that: The screw rod (5) and the inner ring retaining ring (9) are fitted by riveting and fixed together by welding.

4. The bearing mounting structure of an electronic expansion valve according to claim 1, characterized in that: A circle of steps (6) is arranged on the screw rod (5), and the steps (6) bear against one end of the preload spring (4).

5. The bearing mounting structure of an electronic expansion valve according to claim 1, characterized in that: A slot (13) is provided at the upper end of the inner cavity (10), and the bearing (8) is installed in the slot (13), with the outer ring of the bearing (8) fitting tightly against the inner wall of the slot (13).

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