CN215983355U - Electronic expansion valve and refrigerating system thereof - Google Patents

Abstract

The utility model relates to the technical field, in particular to an electronic expansion valve and a refrigerating system, wherein the electronic expansion valve comprises a valve seat, a valve core and a nut; the nut at least partially extends into the valve seat, the nut is sleeved outside the valve core, and the valve core can slide in the nut; the nut comprises a first guide section, and the length of the first guide section is larger than the outer diameter of the valve core. According to the valve core protection device, the first guide section plays a role in protecting the valve core positioned in the first guide section, and the inner wall of the first guide section plays a role in radially limiting the valve core, so that the valve core noise caused by the shaking of the valve core can be prevented; further through the length of injecing first direction section, the length of injecing first direction section is greater than the external diameter of case to improve the first direction section and to the spacing area of case, spacing area is big more, and the case is difficult for the shake more, solves the problem that the case produced obvious shake from this.

Description

Electronic expansion valve and refrigerating system thereof

Technical Field

The utility model relates to the technical field of refrigeration, in particular to an electronic expansion valve and a refrigeration system thereof.

Background

The electronic expansion valve is one of four major components of a refrigeration cycle system, performs the function of throttling and depressurizing by changing the throttling cross section to control the flow of a refrigerant, and is generally installed between a condenser and an evaporator.

The valve core of the existing electronic expansion valve can generate obvious vibration during working, and further shock wave noise is generated.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide an electronic expansion valve and a refrigeration system thereof.

The utility model provides an electronic expansion valve, which comprises a valve seat, a valve core and a nut; the nut at least partially extends into the valve seat, the nut is sleeved outside the valve core, and the valve core can slide in the nut; the nut comprises a first guide section, and the length of the first guide section is larger than the outer diameter of the valve core.

In one embodiment, the electronic expansion valve further comprises a screw connected with the valve core; the screw rod extends into the nut and can move along the axis of the nut; the screw comprises a smooth section and a threaded section, and the threaded section is in threaded connection with the nut; the nut further comprises a second guide section, and the length of the second guide section is larger than the outer diameter of the smooth section.

In one embodiment, the electronic expansion valve further comprises a valve sleeve, a stop assembly and a first stop member; the valve sleeve is arranged on the valve seat, at least part of the nut is arranged in the valve sleeve, the stop component is connected to the inner wall of the valve sleeve, a first stop component is arranged at one end, far away from the valve core, of the screw rod, and the first stop component is matched with the stop component to limit the axial operation of the screw rod.

In one embodiment, the valve seat has a flow passage therein, and a valve port is formed on the valve seat and is communicated with the flow passage; the first guide section extends into the flow channel.

In one embodiment, an outer side surface of the first guide section and an end surface of the first guide section facing one end of the valve port are chamfered to form a slope.

In one embodiment, the angle between the inclined surface and the axis of the valve core is in the range of 15-75 degrees.

In one embodiment, the nut is a clearance fit with the valve seat.

In one embodiment, a connecting piece is arranged between the nut and the valve seat, and the hardness of the connecting piece is greater than that of the nut.

In one embodiment, the connecting piece is provided with a convex part, and the convex part is embedded into the nut.

The utility model also provides a refrigeration system comprising an electronic expansion valve as described in any of the above.

Compared with the prior art, the electronic expansion valve and the refrigeration system thereof provided by the utility model have the following beneficial effects:

the utility model provides an electronic expansion valve, wherein a nut comprises a first guide section, and because a valve core part is positioned in the first guide section, the first guide section plays a role in protecting a valve core positioned in the first guide section, and the inner wall of the first guide section plays a role in radially limiting the valve core, so that the valve core noise caused by the shaking of the valve core can be prevented; further through the length of injecing first direction section, the length of injecing first direction section is greater than the external diameter of case to improve the first direction section and to the spacing area of case, spacing area is big more, and the case is difficult for the shake more, solves the problem that the case produced obvious shake from this.

Drawings

Fig. 1 is a schematic structural diagram of an electronic expansion valve according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at point I;

FIG. 3 is an enlarged view of a portion II of FIG. 2;

FIG. 4 is a schematic structural diagram of an electronic expansion valve according to another embodiment of the present invention;

fig. 5 is a partially enlarged view of fig. 4 at point iii.

In the figure, 100, electronic expansion valves; 10. a valve seat; 11. a valve port; 12. a flow channel; 13. a first opening; 14. a second opening; 15. a first communication pipe; 16. a second communicating pipe; 17. a thermally insulating cavity; 20. a valve core; 21. a drainage section; 30. a nut; 31. a first guide section; 311. a bevel; 32. a second guide section; 40. a screw; 41. a smooth section; 42. a threaded segment; 43. an accommodating cavity; 44. an elastic member; 45. a bearing; 50. a valve housing; 60. a stop assembly; 61. a second stopper; 62. connecting columns; 63. a guide portion; 64. a stop block; 70. a first stopper; 80. a connecting member; 81. a boss portion; 90. a magnetic rotor.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly mounted on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

The electronic expansion valve 100 provided by the utility model is installed in a refrigeration system, is usually installed between a condenser and an evaporator, controls the flow of a refrigerant by changing the flow circulation area, and plays a role in throttling and reducing pressure.

Specifically, referring to fig. 1 to 5, the electronic expansion valve 100 includes a valve seat 10, a valve spool 20, and a nut 30; the nut 30 at least partially extends into the valve seat 10, the nut 30 is sleeved outside the valve core 20, and the valve core 20 can slide in the nut 30; the nut 30 includes a first guide section 31, i.e., a section a shown in fig. 1 and 2, and the length of the first guide section 31 is greater than the outer diameter of the spool 20.

In this application, the valve core 20 is partially located in the first guide section 31, so that the first guide section 31 protects the valve core 20 located therein, fluid can be prevented from impacting the valve needle located in the first guide section 31, and the inner wall of the first guide section 31 has a radial limiting effect on the valve core 20, so that the jitter of the valve core 20 can be obviously reduced, and the shock wave noise can be reduced.

In addition, the spool 20 can be prevented from rattling by generally defining the relationship between the inner diameter of the first guide section 31 and the outer diameter of the spool 20, for example, reducing the clearance between the inner wall of the first guide section 31 and the side wall of the spool 20 as much as possible, however, it is also necessary to ensure that the spool 20 can run in the first guide section 31, and therefore, the inner diameter of the first guide section 31 cannot be equal to the outer diameter of the spool 20, and rattling of the spool 20 cannot be prevented by reducing the inner diameter of the first guide section 31; therefore, the length of the first guide section 31 is limited, and the length of the first guide section 31 is larger than the outer diameter of the valve core 20, so that the limiting area of the first guide section 31 to the valve core 20 is increased, when the limiting area of the first guide section 31 to the valve core 20 is larger, the valve core 20 is less prone to shaking, and the impact area of the valve core 20 on fluid is smaller, so that the problem that the valve core 20 shakes obviously is effectively solved, an additional auxiliary structure is not required to be added, and the cost is reduced.

Referring to fig. 1-5, the valve seat 10 defines a first opening 13, a valve port 11 and a second opening 14, the second opening 14 is connected to the valve port 11, a flow passage 12 is disposed in the valve seat 10, and the flow passage 12 is connected to the first opening 13 and the valve port 11 respectively.

A first communicating pipe 15 is arranged in the first opening 13, a second communicating pipe 16 is arranged in the second opening 14, and the first communicating pipe 15 and the second communicating pipe 16 are convenient for a user to be in butt joint with a pipeline in the refrigeration system.

One end of the valve core 20 is provided with a drainage section 21, the drainage section 21 can extend into the valve port 11 in the process that the valve core 20 moves along the axial direction, the drainage section 21 is conical, and the cross section of a circulation cavity between the outer wall of the drainage section 21 and the inner wall of the valve port 11 is different along with the different depth of the drainage section 21 extending into the valve port 11, so that the circulation of a medium is controlled.

Preferably, the first guide section 31 projects into the flow channel 12. In this embodiment, the first opening 13 is an inlet, and when the medium enters the flow channel 12 from the first opening 13, the first guide section 31 extending into the flow channel 12 can protect the valve element 20 from direct impact of the medium, and prevent noise generated by vibration of the valve element 20 impacting the inner wall of the valve port 11. Of course, in other embodiments, such as fig. 3 and 4, the first guide section 31 may not extend into the flow channel 12.

Further, referring to fig. 2, a chamfer is formed between an outer side surface of the first guide section 31 and an end surface of the first guide section 31 facing the end of the valve port 11 to form an inclined surface 311, so that the medium flows smoothly, the flow resistance is reduced, and the vortex noise is alleviated.

Preferably, the angle between the ramp 311 and the axis of the spool 20 is in the range of 15 to 75. So set up, set up the chamfer of direction section in suitable within range, if the chamfer is too big, then influence the guard action of direction section to case 20, if the chamfer is too little, then influence the water conservancy diversion effect of inclined plane 311 to the medium.

Referring to fig. 1-5, the electronic expansion valve 100 further includes a screw 40, the screw 40 being connected to the valve core 20; the screw 40 extends into the nut 30, and the screw 40 can move along the axis of the nut 30; the screw 40 comprises a smooth section 41 and a threaded section 42, and the threaded section 42 is in threaded connection with the nut 30; the nut 30 seat also comprises a second guiding section 32, section B shown in fig. 1 and 4, the second guiding section 32 being fitted to the screw, and the length of the second guiding section 32 being greater than the outer diameter of the smooth section 41. It can be understood that, by arranging the second guiding section 32, the inner wall of the second guiding section 32 has a limiting effect on the screw 40, so that the shaking of the screw 40 is reduced; and, the longer the second guide section 32, the more remarkable the limiting and guiding effect on the screw 40 is, so that the smooth section 41 of the screw 40 can smoothly run and slide in the screw 40 along the axial direction of the screw 40.

It is worth noting that the second guide section 32 is in clearance fit with the smooth section 41 of the screw 40, and on the premise that the screw 40 can run, the smaller the clearance is, the better the limiting effect on the screw 40 is, and the shake of the screw 40 is prevented.

Referring to fig. 1 and 4, the screw 40 is connected to the valve element 20 through an elastic element 44, one end of the screw 40 is provided with an accommodating cavity 43, the elastic element 44 is disposed in the accommodating cavity 43, one end of the elastic element 44 abuts against the screw 40, the other end abuts against the valve element 20, the screw 40 presses down the valve element 20 through the elastic element 44, and when the valve port 11 is closed, the valve element 20 is driven by a restoring force of the elastic element 44, so that the valve element 20 is in close contact with the valve port 11, and the tightness of closing the valve port 11 is ensured.

The screw 40 is rotatably connected with the valve core 20 through a bearing 45, the bearing 45 is a rolling bearing, the outer ring of the bearing 45 is fixedly connected with the inner wall of the accommodating groove, and the valve core 20 is arranged on the inner ring of the bearing 45 in a penetrating manner, so that the valve core 20 can be prevented from rotating, and the screw 40 only controls the axial movement of the valve core 20. When the screw 40 rotates in the axial direction and moves in the direction away from the valve port 11, the valve element 20 moves along with the screw 40 in the direction away from the valve port 11, and the valve port 11 is opened.

Referring to fig. 1 and 4, the electronic expansion valve 100 further includes a magnetic rotor 90, the magnetic rotor 90 is connected to the screw 40, the magnetic rotor 90 is rotated by electromagnetic induction to drive the screw 40 to rotate, and the threaded section 42 of the screw 40 is matched with the nut 30 to drive the screw 40 to move in the nut 30 along the axial direction thereof, so as to open/close the valve port 11.

Referring to fig. 1 and 4, the electronic expansion valve 100 further includes a valve housing 50, a stop assembly 60, and a first stopper 70; the valve sleeve 50 is arranged on the valve seat 10, at least part of the nut 30 is arranged in the valve sleeve 50, the stop assembly 60 is connected to the inner wall of the valve sleeve 50, one end of the screw 40 far away from the valve core 20 is provided with a first stop member 70, and the first stop member 70 is matched with the stop assembly 60 to limit the axial running of the screw 40, so that the screw 40 is prevented from unrestrained pressing down the valve core 20, and meanwhile, the screw 40 is prevented from unrestrained moving towards the direction far away from the valve port 11.

Specifically, the stopper assembly 60 includes a second stopper 61 and a coupling post 62, the coupling post 62 is coupled to an inner wall of the valve housing 50, an outer side surface of the coupling post 62 is provided with a spiral-shaped guide 63, the spiral-shaped guide 63 forms a guide path, and the second stopper 61 is movable on the guide 63.

The two ends of the connecting column 62 are respectively provided with a stop block 64, when the second stop part 61 moves to the upper part of the connecting column 62, the stop block 64 stops the second stop part 61 from further moving, the second stop part 61 abuts against the first stop part 70 to stop the screw 40 from further rotating, and therefore the screw 40 is further prevented from moving towards the direction away from the valve port 11. When the second stopper 61 moves to the lower part of the connecting column 62, the stopper block 64 located at the lower part blocks the second stopper 61 from further moving, and the second stopper 61 abuts against the first stopper 70 to block the screw 40 from further rotating, thereby blocking the screw 40 from further moving toward the direction in which the valve approaches the valve port 11.

In one embodiment, referring to fig. 1 and 4, a connecting member 80 is disposed between the nut 30 and the valve seat 10, and the hardness of the connecting member 80 is greater than that of the nut 30, so that the connecting member 80 can protect the nut 30 from being worn.

The connector 80 is in interference fit with the valve seat 10, so that the valve seat 10 can perform a rotation stopping function for the connector 80 and the nut 30.

The nut 30 is made of engineering plastics, so that the weight of the nut 30 can be reduced, the nut can be molded by injection molding, and the quality of threads in the nut 30 can be guaranteed in the injection molding process; the connecting piece 80 is made of metal or powder metallurgy, the metal piece or powder metallurgy is hard, and when the connecting piece is in interference fit with the valve seat 10, the nut 30 can be protected from being damaged by the connecting piece, and the integrity of the nut 30 is guaranteed.

Preferably, the nut 30 is made of PPS (polyphenylene sulfide), which has self-lubricating property and can reduce the abrasion between the valve element 20 and the nut 30 and avoid the seizing. The connecting member 80 may be made of a material having hardness greater than that of the engineering plastic, such as stainless steel.

Further, referring to fig. 1, a protrusion 81 is provided on the connecting member 80, and the protrusion 81 is embedded in the nut 30. In the process of forming the nut 30 by injection molding, the protrusion 81 is fitted into the nut 30 to enhance the connection between the connector 80 and the nut 30 and prevent the connector 80 and the nut 30 from coming off.

Preferably, the hardness of the coupling member 80 is greater than or equal to the hardness of the valve seat 10, thereby ensuring that the coupling member 80 deforms little or substantially no when the coupling member 80 is pressed into the valve seat 10 with interference.

In addition, referring to fig. 3, the nut 30 is in clearance fit with the valve seat 10, so that the heat insulation cavity 17 is formed between the nut 30 and the valve seat 10, the nut 30 is protected, when parts such as the first communication pipe 15 are welded, the heat insulation cavity can prevent high temperature generated during welding from being transmitted to the nut 30, and the nut 30 is prevented from being damaged by heat.

The present application further provides a refrigeration system comprising any of the electronic expansion valves 100 described above. In this way, by reducing the jitter of the valve needle and the screw 40 in the electronic expansion valve 100, the generation of noise is reduced, thereby effectively reducing the noise generated in the refrigeration system.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The features of the above embodiments may be arbitrarily combined, and for the sake of brevity, all possible combinations of the features in the above embodiments are not described, but should be construed as being within the scope of the present specification as long as there is no contradiction between the combinations of the features.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that suitable changes and modifications of the above embodiments are within the scope of the claimed invention as long as they are within the spirit and scope of the present invention.

Claims (10)

1. An electronic expansion valve is characterized by comprising a valve seat, a valve core and a nut; the nut at least partially extends into the valve seat, the nut is sleeved outside the valve core, and the valve core can slide in the nut;

the nut comprises a first guide section, and the length of the first guide section is larger than the outer diameter of the valve core.

2. The electronic expansion valve of claim 1, further comprising a screw, the screw being coupled to the valve element; the screw rod extends into the nut and can move along the axis of the nut;

the screw comprises a smooth section and a threaded section, and the threaded section is in threaded connection with the nut;

the nut further comprises a second guide section, and the length of the second guide section is larger than the outer diameter of the smooth section.

3. The electronic expansion valve of claim 2, further comprising a valve housing, a stop assembly, and a first stop; the valve sleeve is arranged on the valve seat, at least part of the nut is arranged in the valve sleeve, the stop component is connected to the inner wall of the valve sleeve, a first stop component is arranged at one end, far away from the valve core, of the screw rod, and the first stop component is matched with the stop component to limit the axial operation of the screw rod.

4. The electronic expansion valve according to claim 1, wherein the valve seat has a flow channel therein, and a valve port is formed on the valve seat, and the valve port is communicated with the flow channel; the first guide section extends into the flow channel.

5. The electronic expansion valve according to claim 4, wherein an outer side surface of the first guide section and an end surface of the first guide section facing an end of the valve port are chamfered to form a slope.

6. The electronic expansion valve of claim 5, wherein the angle between the slope and the axis of the valve spool is in the range of 15 ° -75 °.

7. An electronic expansion valve according to claim 1, wherein the nut is a clearance fit with the valve seat.

8. An electronic expansion valve according to claim 1, wherein a connector is provided between the nut and the valve seat, and the connector has a hardness greater than the hardness of the nut.

9. An electronic expansion valve according to claim 8, wherein the connector is provided with a protrusion, which is embedded in the nut.

10. A refrigeration system comprising an electronic expansion valve according to any of claims 1-9.

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