CN214466137U

CN214466137U - Be applied to electronic expansion valve's step motor

Info

Publication number: CN214466137U
Application number: CN202120541258.8U
Authority: CN
Inventors: 党红关; 贲志鑫
Original assignee: Jiangsu Leili Motor Co Ltd
Current assignee: Jiangsu Leili Motor Co Ltd
Priority date: 2021-03-16
Filing date: 2021-03-16
Publication date: 2021-10-22
Anticipated expiration: 2031-03-16

Abstract

The utility model discloses a be applied to electronic expansion valve's step motor, it includes nonrust steel bushing and case cover, be provided with rotor subassembly and case subassembly in the closed inner chamber that nonrust steel bushing and case cover constitute, the case subassembly includes guide pin bushing nut, the rotor subassembly suit is on guide pin bushing nut, rotor subassembly and guide pin bushing nut interference crimping, guide pin bushing nut's surface is provided with prevents rotor subassembly and the flat position of guide pin bushing nut relative rotation. The utility model provides a stepping motor applied to an electronic expansion valve, wherein, a valve core component adopts a double ball bearing design, thereby ensuring the concentricity of a magnetic ring and a steel sleeve and reducing the risk of internal interference iron wiping; in addition, the triangular thread design is adopted to better ensure the sealing performance when the valve is closed, and meanwhile, the spring is skillfully used to provide assistance for opening the valve; the connection mode of the valve needle and the screw rod is optimized, and the valve needle is better sealed with the valve port.

Description

Be applied to electronic expansion valve's step motor

Technical Field

The utility model relates to a be applied to electronic expansion valve's step motor.

Background

At present, along with the development of science and technology, a refrigeration system is widely applied to various fields of business and civil use; the main function is to control the flow of the refrigerant by controlling the opening and closing of the valve through the stepping motor to achieve the purpose of refrigeration; the valve core assembly of the existing expansion valve on the market is designed by adopting a single ball bearing, and a screw and a nut are designed by adopting trapezoidal threads; the structure has the defects that the concentricity of the magnetic ring and the inner wall of the steel sleeve is poor, the phenomenon of wiping the iron core during operation is avoided, the trapezoidal thread does not have the self-locking function, and the valve is not closed tightly due to the pressure difference between the inside and the outside when the valve is closed, so that the leakage phenomenon exists.

Disclosure of Invention

The utility model aims to solve the technical problem of overcoming the defects of the prior art and providing a stepping motor applied to an electronic expansion valve, wherein a valve core assembly adopts a double ball bearing design, thereby ensuring the concentricity of a magnetic ring and a steel sleeve and reducing the risk of internal interference iron wiping; in addition, the triangular thread design is adopted to better ensure the sealing performance when the valve is closed, and meanwhile, the spring is skillfully used to provide assistance for opening the valve; the connection mode of the valve needle and the screw rod is optimized, and the valve needle is better sealed with the valve port.

In order to solve the technical problem, the technical scheme of the utility model is that:

the stepping motor comprises a stainless steel sleeve and a valve core sleeve, wherein a rotor assembly and a valve core assembly are arranged in a closed inner cavity formed by the stainless steel sleeve and the valve core sleeve, the valve core assembly comprises a guide sleeve nut, the rotor assembly is sleeved on the guide sleeve nut, the rotor assembly is in interference compression joint with the guide sleeve nut, and a flat position for preventing the rotor assembly and the guide sleeve nut from rotating relatively is arranged on the outer surface of the guide sleeve nut.

Further, the inside injection molding body of rotor subassembly is the polygon, the surface of guide pin bushing nut is the polygon with inside injection molding body matched with of rotor subassembly.

Furthermore, a reinforcing rib is arranged on the flat position, and the outer surface of the reinforcing rib is semicircular.

Further, the valve core assembly further comprises an upper bearing seat, a lower bearing seat and a screw rod in threaded connection with the guide sleeve nut, the guide sleeve nut and the screw rod are in threaded connection through triangular threads, the upper bearing seat and the lower bearing seat are respectively arranged at two ends of the guide sleeve nut, an upper ball bearing is arranged in the upper bearing seat, and a lower ball bearing is arranged in the lower bearing seat.

Furthermore, a limiting shaft is arranged in the upper bearing seat, one end of the limiting shaft is in interference pressure connection with the upper bearing seat, and the other end of the limiting shaft is located in the guide sleeve nut.

Further, the guide sleeve nut is sleeved with a pressure spring, one end of the pressure spring is abutted to the outer surface of the guide sleeve nut, and the other end of the pressure spring is separated from the upper ball bearing through a stainless steel gasket.

Further, the end connection of screw rod has the needle, the tip of screw rod is the bulb structure, be provided with a plurality of arc elastic connection pieces of being connected with the tip cooperation of screw rod on the needle, elastic connection piece's periphery joint has the jump ring, the draw-in groove has been seted up to the periphery of screw rod, the draw-in groove endotheca is equipped with the O type circle that is used for sealing the clearance between screw rod and the step.

Furthermore, the screw rod is inserted with a rotation stopping pin, and the rotation stopping pin is positioned in the upper bearing seat.

Further, the internal thread of the guide sleeve nut is located at 1/3 of the guide sleeve nut.

Further, the stainless steel sleeve is mechanically riveted with the lower bearing seat.

By adopting the technical scheme, the valve core assembly of the utility model optimizes the structure of the traditional valve core assembly, the concentricity of the rotor assembly and the stainless steel outer sleeve is better ensured by the inner rotor assembly by using the double-ball bearing structure, the production difficulty is reduced, and the product quality is improved; the nut and the screw are occluded by using triangular threads, and the sealing property of the closed valve is better packaged due to the self-locking performance of the triangular threads; the valve needle and the screw adopt flexible connection to enable the valve needle and the valve core sleeve to be aligned better, radial stress of the screw caused by non-concentricity of the valve needle and the valve core sleeve is avoided, and therefore the service life is shortened.

Drawings

Fig. 1 is a front view of a valve core assembly of a stepping motor applied to an electronic expansion valve according to the present invention;

fig. 2 is a valve needle closing state diagram of the present invention;

fig. 3 is a view showing an open state of the valve needle of the present invention;

fig. 4 is a view of the whole stepping motor applied to the electronic expansion valve of the present invention;

FIG. 5 is a cross-sectional view of FIG. 4;

FIG. 6 is an exploded view of the valve core assembly of the present invention;

fig. 7 is a schematic view illustrating interference crimping of the rotor assembly and the guide sleeve nut according to the present invention;

fig. 8 is a schematic view of the outer surface of the guide sleeve nut of the present invention;

fig. 9 is a use state diagram of the limiting shaft of the present invention;

FIG. 10 is a schematic view of the track of the screw of the present invention;

fig. 11 is a schematic structural view of the valve needle of the present invention;

fig. 12 is a schematic structural view of the screw of the present invention;

fig. 13 is a schematic position diagram of the inner thread of the guide sleeve nut of the present invention.

Detailed Description

In order that the present invention may be more readily and clearly understood, the following detailed description of the present invention is provided in connection with the accompanying drawings.

As shown in fig. 1 to 12, a stepping motor applied to an electronic expansion valve includes a stainless steel sleeve 1 and a valve core sleeve 2, a rotor assembly 3 and a valve core assembly are disposed in a sealed inner cavity formed by the stainless steel sleeve 1 and the valve core sleeve 2, the valve core assembly includes a guide nut 4, the rotor assembly 3 is sleeved on the guide nut 4, the rotor assembly 3 and the guide nut 4 are in interference compression joint, and a flat position 41 for preventing the rotor assembly 3 and the guide nut 4 from rotating relatively is disposed on the outer surface of the guide nut 4.

As shown in fig. 7 and 8, the injection molded body inside the rotor assembly 3 is polygonal, and the outer surface of the guide nut 4 is polygonal matched with the injection molded body inside the rotor assembly 3, so that the risk of insufficient slipping of the matching strength is effectively avoided by the cooperation of the two.

As shown in fig. 8, the flat portion 41 is provided with a rib 411, and an outer surface of the rib 411 is semicircular. Through strengthening rib 411 and the inside injection molding body tight fit of rotor subassembly 3 for interference fit department is line (tangent line) face contact, has reduced the fitting surface, has avoided the too big problem that leads to rotor subassembly 3 and guide pin bushing nut 4 decentraction of crimping power.

As shown in fig. 5 and 6, the valve core assembly further includes an upper bearing seat 5, a lower bearing seat 6, and a screw rod 7 in threaded connection with the guide sleeve nut 4, the guide sleeve nut 4 and the screw rod 7 are in threaded connection by using triangular threads, the upper bearing seat 5 and the lower bearing seat 6 are respectively disposed at two ends of the guide sleeve nut 4, an upper ball bearing 51 is disposed in the upper bearing seat 5, and an upper ball bearing 61 is disposed in the lower bearing seat 6. Two ball bearing location are used at 4 both ends of guide pin bushing nut, current case subassembly adopts single ball bearing structure on the market, this structure is because rotor subassembly 3 only one end and ball bearing cooperation location outside, rotor subassembly 3 no other local location again, and guide pin bushing nut 4 is the injection molding with rotor subassembly 3 support, it is poor to have the circularity, the phenomenon that size precision is poor beats when leading to the rotor subassembly motion great, cause magnetic ring external diameter and the 1 inner wall of stainless steel bushing to interfere frictional phenomenon, this defect that the defective rate is high when leading to production, production efficiency is low. The utility model discloses use two ball bearing location to reduce the required precision of part, promoted the product concentricity, reduced beating when rotor subassembly 3 moves, avoided magnetic ring external diameter and the frictional phenomenon of 1 inner wall of stainless steel cover to promote the production efficiency of product, and then promoted the life of product.

As shown in fig. 5 and 6, a limiting shaft 8 is arranged in the upper bearing seat 5, one end of the limiting shaft 8 is in interference press connection with the upper bearing seat 5, and the other end of the limiting shaft 8 is located in the guide sleeve nut 4. The limiting shaft 8 is in interference compression joint with the upper bearing seat 5, and the function of the limiting shaft is to ensure that the screw 7 runs to a specified position after the valve is opened, so that the position of the screw 7 is the same position when the valve is opened or closed each time. The inside of the valve core assembly is formed by matching and assembling a plurality of parts, and the position of the guide sleeve nut 4 in the valve core assembly is not fixed due to factors such as difference of the parts, accumulated tolerance of assembly, meshing clearance between the screw 7 and the guide sleeve nut 4 and the like; the opening and closing of the valve are controlled by the pulse number of the stepping motor, so that a part of pulses are additionally added on the basis of theoretically calculating the pulse number required for opening and closing the valve to offset the internal axial clearance to ensure that the screw 7 is at a fixed position when the valve is opened and closed; the limiting shaft 8 is pressed against the screw 7 when the valve is opened to offset the number of redundant pulses.

As shown in fig. 5-10, the guide sleeve nut 4 is sleeved with a pressure spring 9, one end of the pressure spring 9 abuts against the outer surface of the guide sleeve nut 4, the other end of the pressure spring 9 is separated from the upper ball bearing 51 through a stainless steel gasket 10, the pressure spring 9 is prevented from applying pressure to the inner ring of the ball bearing, the pressure of the pressure spring 9 is applied to the surface of the guide sleeve nut, the pressure is not directly applied to the rotor assembly 3, and the phenomenon that the rotor assembly 3 is forced to cause step loss in operation is avoided. The position of the pressure spring 9 is at the end part of the rotor and is used for offsetting the internal axial gap under the normal state; when the valve is closed, the screw 7 moves downwards, when the valve needle 11 is in contact with a valve port and is locked for 30 pulses, the screw keeps continuously downward force, and due to the action of force, the guide sleeve nuts 4 move upwards to extrude the pressure spring 9, so that the pressure spring 9 is stressed; when the valve is opened, the screw 7 moves upwards to change the guide sleeve nut 4 into downward movement, and the pressure spring 9 releases elasticity to offset the internal clearance of the assembly, so that the valve opening steps are reduced, and the valve is opened quickly. In fig. 10, a indicates a valve closing process, B indicates a process of continuing to operate 30 pulses after the valve is closed, C indicates a valve opening process, and D indicates a process of continuing to operate 30 pulses after the valve is opened.

As shown in fig. 5, 11 and 12, the end of the screw rod 7 is connected with a valve needle 11, the end of the screw rod 7 is a ball head structure 71, the valve needle 11 is provided with a plurality of arc-shaped elastic connecting pieces 111 which are connected with the end of the screw rod 7 in a matching manner, the outer periphery of each elastic connecting piece 111 is clamped with a clamp spring 112, and the clamp springs 112 are installed on the valve needle and used for clamping the elastic connecting pieces 111 to prevent the valve needle 11 from loosening in the operation process. The draw-in groove has been seted up to the periphery of screw rod 7, and the draw-in groove endotheca is equipped with the O type circle 73 that is used for sealing the clearance between screw rod 7 and the step 6, and the mesopore of screw rod 7 and step 6 is clearance fit, and there is the phenomenon of beating screw rod 7 in service, increases O type circle 73 and can reduce the beating of screw rod 7, thereby avoids the striking noise reduction of screw rod 7 and step 6 for the valve body operation is more silent. The valve needle 11 is matched with the screw 7 in a spherical flexible connection mode, and the valve needle 11 can be finely adjusted after being matched with the screw 7; the conventional valve needle 11 and the screw 7 are in hard connection, and when the valve needle and a valve port are sealed when the valve is closed, the screw can be stressed laterally, so that the service life of the valve core assembly is influenced; and adopt the flexible coupling to reduce and produce the line assembly degree of difficulty, promote assembly efficiency, the leakproofness is better, promotes life.

As shown in fig. 6, the rotation stop pin 72 is inserted into the screw 7, the rotation stop pin 72 is located in the upper bearing seat 5, and the rotation stop pin 72 is added on the surface of the screw 7 to avoid wasting pulse number when the screw 7 rotates with the screw, thereby improving the efficiency of opening and closing the valve.

As shown in fig. 13, the internal thread of the guide nut 4 is located at 1/3 of the guide nut 4, and the position S of the internal thread of the guide nut 4 is located at 1/3 of the guide nut 4, so that the matching position with the ball bearing is avoided, and the problem of thread deformation after compression joint with the ball bearing is avoided. In addition, on the premise of meeting the running stroke of the screw 7, when the internal thread is at 1/3, the length required by the screw 7 is the shortest, so that the production cost of the screw 7 is reduced, the shorter the length of the screw 7 is, the smaller the runout degree of the screw 7 is, the higher the processing precision is, the transmission efficiency is obviously improved, and meanwhile, the structure of the valve core assembly is more compact.

As shown in figure 5, the stainless steel sleeve 1 and the lower bearing seat 6 are mechanically riveted, so that the displacement of the stainless steel sleeve 1 in the stress process is prevented.

The above embodiments further describe the technical problems, technical solutions and advantages of the present invention in detail, it should be understood that the above only are embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. The utility model provides a be applied to step motor of electronic expansion valve which characterized in that: the novel valve core assembly comprises a stainless steel sleeve (1) and a valve core sleeve (2), wherein a rotor assembly (3) and a valve core assembly are arranged in a closed inner cavity formed by the stainless steel sleeve (1) and the valve core sleeve (2), the valve core assembly comprises a guide sleeve nut (4), the rotor assembly (3) is sleeved on the guide sleeve nut (4), the rotor assembly (3) is in interference crimping with the guide sleeve nut (4), and a flat position (41) for preventing the rotor assembly (3) and the guide sleeve nut (4) from rotating relatively is arranged on the outer surface of the guide sleeve nut (4).

2. The stepping motor applied to an electronic expansion valve according to claim 1, wherein: the injection molding body in the rotor assembly (3) is polygonal, and the outer surface of the guide sleeve nut (4) is polygonal matched with the injection molding body in the rotor assembly (3).

3. The stepping motor applied to an electronic expansion valve according to claim 1, wherein: the flat position (41) is provided with a reinforcing rib (411), and the outer surface of the reinforcing rib (411) is semicircular.

4. The stepping motor applied to an electronic expansion valve according to claim 1, wherein: the valve core assembly further comprises an upper bearing seat (5), a lower bearing seat (6) and a screw rod (7) in threaded connection with the guide sleeve nut (4), the guide sleeve nut (4) and the screw rod (7) are in threaded connection through triangular threads, the upper bearing seat (5) and the lower bearing seat (6) are respectively arranged at two ends of the guide sleeve nut (4), an upper ball bearing (51) is arranged in the upper bearing seat (5), and a lower ball bearing (61) is arranged in the lower bearing seat (6).

5. The stepping motor applied to an electronic expansion valve according to claim 4, wherein: a limiting shaft (8) is arranged in the upper bearing seat (5), one end of the limiting shaft (8) is in interference compression joint with the upper bearing seat (5), and the other end of the limiting shaft (8) is located in the guide sleeve nut (4).

6. The stepping motor applied to an electronic expansion valve according to claim 4, wherein: the guide sleeve nut (4) is sleeved with a pressure spring (9), one end of the pressure spring (9) is abutted to the outer surface of the guide sleeve nut (4), and the other end of the pressure spring (9) is separated from the upper ball bearing (51) through a stainless steel gasket (10).

7. The stepping motor applied to an electronic expansion valve according to claim 4, wherein: the end connection of screw rod (7) has needle (11), the tip of screw rod (7) is bulb structure (71), be provided with arc elastic connection piece (111) that a plurality of tip cooperations with screw rod (7) are connected on needle (11), the periphery joint of elastic connection piece (111) has jump ring (112), the draw-in groove has been seted up to the periphery of screw rod (7), the draw-in groove endotheca is equipped with O type circle (73) that are used for sealing the clearance between screw rod (7) and step (6).

8. The stepping motor applied to an electronic expansion valve according to claim 4, wherein: the screw rod (7) is inserted with a rotation stopping pin (72), and the rotation stopping pin (72) is positioned in the upper bearing seat (5).

9. The stepping motor applied to an electronic expansion valve according to claim 1, wherein: the inner thread of the guide sleeve nut (4) is positioned at 1/3 of the guide sleeve nut (4).

10. The stepping motor applied to an electronic expansion valve according to claim 1, wherein: the stainless steel sleeve (1) is mechanically riveted with the lower bearing seat (6).