CN110836269A

CN110836269A - Electronic expansion valve and air conditioning system using same

Info

Publication number: CN110836269A
Application number: CN201810942746.2A
Authority: CN
Inventors: 贺宇辰; 许学飞; 刘乐强
Original assignee: Zhejiang DunAn Hetian Metal Co Ltd
Current assignee: Zhejiang DunAn Hetian Metal Co Ltd
Priority date: 2018-08-17
Filing date: 2018-08-17
Publication date: 2020-02-25
Anticipated expiration: 2038-08-17
Also published as: CN110836269B

Abstract

The invention provides an electronic expansion valve, which comprises a valve body, wherein a valve port is formed in the valve body, and the valve port and the valve body are coaxially arranged; the valve body is provided with a valve port, one end of the valve body, which is provided with the valve port, is named as a first end, one end of the valve body, which is opposite to the first end, is named as a second end, and the valve port is arranged along the direction of the second end pointing to the first end in a feeding mode. The invention also provides an air conditioning system using the electronic expansion valve. The electronic expansion valve provided by the invention is directly provided with the valve port on the valve body, the valve port and the valve body are coaxially arranged, and the valve port is arranged along the direction of the second end pointing to the first end in a feeding way. Due to the adoption of the processing mode of upper end feed, the valve port of the valve body only needs to be clamped once during processing, so that the clamping times of the valve port of the valve body in the manufacturing process are reduced, the positioning error of the valve port of the valve body in the processing process is reduced, and the coaxiality of the valve body and the valve port is improved.

Description

Electronic expansion valve and air conditioning system using same

Technical Field

The invention relates to the technical field of refrigeration equipment, in particular to an electronic expansion valve.

Background

The electronic expansion valve opens or closes a valve port arranged on the valve body through the movement of the valve rod component in the guide sleeve and the nut sleeve, thereby realizing the purposes of flow regulation and throttling and pressure reduction, and having wide application in the technical field of refrigeration equipment. The traditional electronic expansion valve is characterized in that the valve body and the valve seat core are arranged in a split mode, and the valve port is formed in the valve seat core, so that the split structure not only reduces the integrity of the electronic expansion valve, but also reduces the installation precision of the electronic expansion valve, and the coaxiality of the valve port and the valve body cannot be effectively guaranteed.

Disclosure of Invention

In view of the above, there is a need for an improved electronic expansion valve and an air conditioning system using the same, in which the electronic expansion valve integrates a valve port into a valve body, and the coaxiality of the valve port and the valve body is ensured, and the electronic expansion valve and the air conditioning system using the same have relatively high reliability and stability.

The invention provides an electronic expansion valve, which comprises a valve body, wherein a valve port is formed in the valve body, and the valve port and the valve body are coaxially arranged; the valve body is provided with a valve port, one end of the valve body, which is provided with the valve port, is named as a first end, one end of the valve body, which is opposite to the first end, is named as a second end, and the valve port is arranged along the direction of the second end pointing to the first end in a feeding mode.

Furthermore, a first chamfer is arranged on the end surface of the valve port close to the second end.

Further, the end face, far away from the second end, of the valve port is provided with a second chamfer.

Further, the first chamfer and the second chamfer are both smaller than 0.1 mm.

Further, the electronic expansion valve also comprises a guide sleeve which is in contact with the valve body, and the wall thickness of the valve body in contact with the guide sleeve is 30-80% of the radius of the valve body.

Further, the wall thickness dimension of the valve body in contact with the guide sleeve is 80% of the radius of the valve body.

Further, the guide sleeve is in interference fit with the valve body.

Furthermore, the electronic expansion valve also comprises a sleeve, and the sleeve is fixedly connected to the valve body.

Further, the sleeve is arranged on the valve body in a welding and fixing mode.

The invention also provides an air conditioning system, which comprises an electronic expansion valve, wherein the electronic expansion valve is any one of the electronic expansion valves.

The electronic expansion valve provided by the invention is directly provided with the valve port on the valve body, the valve port and the valve body are coaxially arranged, and the valve port is arranged along the direction of the second end pointing to the first end in a feeding way. Due to the adoption of the processing mode of upper end feed, the valve port of the valve body only needs to be clamped once during processing, so that the clamping times of the valve port of the valve body in the processing and manufacturing processes are reduced, the positioning error of the valve port of the valve body in the processing is reduced, and the coaxiality of the valve body and the valve port is improved. The electronic expansion valve and the air conditioning system using the electronic expansion valve have high stability and reliability and wide application prospect.

Drawings

Fig. 1 is a perspective view of an electronic expansion valve according to an embodiment of the present invention, with a partial structure omitted.

Fig. 2 is an exploded perspective view of the electronic expansion valve shown in fig. 1.

Fig. 3 is a schematic cross-sectional view of the electronic expansion valve shown in fig. 1, with a portion of the structure omitted.

Fig. 4 is a schematic structural view of a valve body in the electronic expansion valve shown in fig. 1.

Fig. 5 is a schematic structural view of a guide sleeve in the electronic expansion valve shown in fig. 3.

Fig. 6 is a schematic cross-sectional view of a screw assembly in the electronic expansion valve shown in fig. 1.

Fig. 7 is a schematic cross-sectional view of a screw assembly and a rotor assembly of the electronic expansion valve shown in fig. 1.

Description of the main elements

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection 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 in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 3, fig. 1 is a schematic perspective view of an electronic expansion valve 100 according to an embodiment of the present invention, with a partial structure omitted, fig. 2 is an exploded perspective view of the electronic expansion valve 100 shown in fig. 1, and fig. 3 is a schematic cross-sectional view of the electronic expansion valve 100 shown in fig. 1, with a partial structure omitted, where the electronic expansion valve 100 is used to regulate a flow rate and a pressure of a fluid medium.

In the present embodiment, the electronic expansion valve 100 is applied to an air conditioning system, and the fluid medium flowing through the electronic expansion valve 100 is a refrigerant for performing heat and cold exchange in the air conditioning system. At this time, the electronic expansion valve 100 is installed at an inlet of an evaporator of the air conditioning system, and the electronic expansion valve 100 serves as a boundary element between a high-pressure side and a low-pressure side of the air conditioning system to throttle and depressurize the high-pressure liquid refrigerant, so that the dosage of the liquid refrigerant entering the evaporator is adjusted and controlled, and the dosage of the liquid refrigerant can meet the requirement of an external refrigeration load.

It is understood that in other embodiments, the electronic expansion valve 100 may also be applied to other types of refrigeration equipment besides an air conditioning system, and the fluid medium flowing through the electronic expansion valve 100 may also be other than refrigerant as long as the electronic expansion valve 100 can achieve throttling and pressure reduction of the fluid medium.

The electronic expansion valve 100 includes a valve body 10, a valve needle assembly 20, a screw assembly 30, a guide sleeve 16, a sleeve 40, a rotor assembly 50, and a stator assembly (not shown), the valve needle assembly 20, the screw assembly 30, the sleeve 40, and the guide sleeve 16 are mounted on the valve body 10, one end of the screw assembly 30 is connected with the valve needle assembly 20, the other end is connected with the rotor assembly 50, and the stator assembly is disposed on the sleeve 40. The valve body 10 is used for carrying the valve needle assembly 20, the screw assembly 30 and the sleeve 40, the valve needle assembly 20 is used for controlling the opening or closing of the electronic expansion valve 100, the screw assembly 30 is used for driving the valve needle assembly 20 to move, the sleeve 40 isolates the external environment from the valve needle assembly 20, the screw assembly 30 and the rotor assembly 50, thereby protecting the valve needle assembly 20, the screw assembly 30 and the rotor assembly 50 from medium leakage, the rotor assembly 50 is used for driving the screw assembly 30 to move, and the stator assembly is used for driving the rotor assembly 50 to move.

The stator assembly is powered on to generate a magnetic field and drive the rotor assembly 50 to rotate under the action of the magnetic field force, the rotor assembly 50 drives the screw assembly 30 to move, and the valve needle assembly 20 is driven by the screw assembly 30 to control the electronic expansion valve 100 to open or close, so that the process of adjusting the flow rate and pressure of the fluid medium by the electronic expansion valve 100 is completed.

Referring to fig. 4, fig. 4 is a schematic structural diagram of the valve body 10 of the electronic expansion valve 100 shown in fig. 1, the valve body 10 is connected to a medium inlet pipe 101 and a medium outlet pipe 102, and a medium fluid enters the electronic expansion valve 100 through the medium inlet pipe 101 and then flows out of the electronic expansion valve 100 through the medium outlet pipe 102. The valve body 10 is sequentially provided with a valve port 11, a valve cavity 12, a through hole 13, a mounting cavity 14 and a connecting cavity 15 along an axis 103 of the valve body, and the valve port 11, the valve cavity 12, the through hole 13, the mounting cavity 14 and the connecting cavity 15 are communicated with each other along the axis 103.

The valve port 11 is communicated with the medium inlet pipe 101, and the valve port 11 is used for the valve needle assembly 20 to extend into, thereby blocking the fluid medium in the electronic expansion valve 100 from being discharged out through the valve port 11. When the valve needle assembly 20 closes the valve port 11, that is, the valve port 11 is disconnected from the valve cavity 12, the electronic expansion valve 100 is closed; when the valve needle assembly 20 releases the seal of the valve port 11, that is, the valve port 11 and the valve chamber 12 communicate with each other, the electronic expansion valve 100 is opened.

The valve cavity 12 is used for accommodating part of the valve needle assembly 20, and fluid medium flows into the valve port 11 through the valve cavity 12. The through hole 13 is arranged between the valve cavity 12 and the mounting cavity 14, the aperture of the through hole 13 is smaller than the inner diameter of the mounting cavity 14, the bottom of the mounting cavity 14 forms a first annular positioning step 14a, the valve body 10 is further internally provided with a guide sleeve 16 for guiding the movement of the valve needle assembly 20, and the through hole 13 and the mounting cavity 14 are mutually matched for realizing the fixed mounting of the guide sleeve 16. The connecting cavity 15 is also provided with a connecting sheet 17 for fixing the screw assembly 30, and the connecting cavity 15 and the connecting sheet 17 are matched with each other to accommodate and fix the screw assembly 30.

The end surface of the valve body 10, which is provided with the connecting cavity 15, contracts in the direction of the axis 103 and forms a step surface 151, the sleeve 40 is sleeved on one end of the valve body 10, which is provided with the connecting cavity 15, and abuts against the step surface 151, the step surface 151 limits the extending length of the sleeve 40, which is sleeved on the valve body 10, and the end surface of the valve body 10, which is provided with the connecting cavity 15, penetrates through the sleeve 40 so as to limit the radial movement of the sleeve 40.

In the present embodiment, in order to further improve the connection stability between the valve body 10 and the sleeve 40, the valve body 10 and the sleeve 40 are fixedly connected to each other by welding, and in this case, the step surface 151 is a welding fixing surface between the valve sleeve 40 and the valve body 10. It is understood that in other embodiments, the valve body 10 and the sleeve 40 may be fixedly connected by riveting, gluing, or other connecting methods.

In the present embodiment, the valve body 10 is formed of a stainless steel material, and the valve body 10 has a substantially cylindrical shape. It is understood that in other embodiments, the valve body 10 may be made of other materials, not listed here, and the valve body 10 may have other shapes than a cylinder.

Referring to fig. 5, fig. 5 is a schematic structural diagram of the guide sleeve 16 of the electronic expansion valve 100 shown in fig. 3. The guide sleeve 16 is installed in the installation cavity 14 and is in interference fit with the installation cavity 14. Here, the interference fit means: the dimension of the inner diameter of the mounting cavity 14 minus the dimension of the outer diameter of the mating guide sleeve 16 is negative. The guide sleeve 16 is used to guide the movement of the valve needle assembly 20 along the axis 103 of the valve body 10. The connecting piece 17 is installed in the connecting cavity 15 to install the screw assembly 30. Preferably, the connecting piece 17 is mounted in the connecting cavity 15 by means of welding.

In the present embodiment, the guide bush 16 is formed by processing and manufacturing a brass material, that is, the guide bush 16 is a brass guide bush. The brass guide sleeve is relatively soft and facilitates installation between the guide sleeve 16 and the screw assembly 30 or the valve body 10. It will be appreciated that in other embodiments, the guide sleeve 16 may be manufactured from materials other than brass.

The guide sleeve 16 is substantially cylindrical. The guide sleeve 16 is provided with a guide hole 161 penetrating the guide sleeve 16 along its axis, and the needle assembly 20 is installed in the guide hole 161 and moves under the guidance of the guide hole 161.

Guide sleeve 16 includes a first cylindrical section 162 mounted within mounting cavity 14, a second cylindrical section 163 for mating with screw assembly 30, and a third cylindrical section 164 located within valve cavity 12.

The first cylindrical section 162 is in interference fit with the mounting cavity 14, so that during the installation process of the guide sleeve 16, the axis of the guide sleeve 16 coincides with the axis 103 of the valve body 10, and the coaxiality between the guide sleeve 16 and the valve port 11 is ensured.

Further, the first cylindrical section 162 is an intermediate section, i.e., located between the second cylindrical section 163 and the third cylindrical section 164. The outer diameter of the first cylindrical section 162 is greater than the outer diameter of the second cylindrical section 163 and the outer diameter of the third cylindrical section 164, respectively. Thus, it should be appreciated that the first cylindrical section 162 forms a step 162a with the second and third cylindrical sections 163, 164, respectively. A step 162a between the first and third cylindrical sections 162, 164 cooperates with a first positioning step 14a at the bottom of the mounting cavity 14 to effect positioning of the third cylindrical section 164.

Preferably, the first cylindrical section 162 has a first end 162b disposed opposite and a second end 162c, and the second cylindrical section 163 is connected to the first end 162b of the first cylindrical section 162; the third cylindrical section 164 is connected to the second end 162c of the first cylindrical section 162.

Further, the second end 162c of the first cylindrical section 162 has a guide structure 165 to facilitate mounting of the first cylindrical section 162 to the mounting cavity 14. Preferably, the guide structure 165 includes a guide portion disposed at the second end 162c of the first cylindrical section. Specifically, the guide portion is a round-cornered guide portion or a conical guide portion.

Preferably, the length of the second cylindrical section 163 is 1/4-1/3 times the length of the guide sleeve, and the guide sleeve 16 has sufficient fit dimensions to fit the screw assembly 30, thereby improving the reliability of the connection and reducing the risk of the guide sleeve 16 loosening due to vibration and the like.

Further, the second cylindrical section 163 also has a guide 165 at the first end 162b remote from the first cylindrical section. Here, a guide structure 165 is provided to facilitate installation between the guide housing 16 and the screw assembly 30.

Preferably, the guide structure 165 includes a guide portion 165a disposed on the second cylindrical section 163 distal from the first cylindrical section 162. Specifically, the guide 165a is a round guide or a conical guide.

Referring to fig. 6 and 7, fig. 6 is a schematic cross-sectional view of the screw assembly 30 in the electronic expansion valve 100 shown in fig. 1, and fig. 7 is a schematic cross-sectional view of the screw assembly 30 and the rotor assembly 50 in the electronic expansion valve 100 shown in fig. 1.

The needle assembly 20 includes a needle hub 21 mounted within the guide sleeve 16, and a needle 22 mounted within the needle hub 21. The valve needle 22 has an axis, the axis of the valve needle 22 being arranged coincident with the axis 103 of the valve body 10. One end of the valve needle 22 is connected to the screw assembly 30 and the other end is engaged with the valve port 11. The screw assembly 30 moves the valve needle 22 to control the opening or closing of the valve port 11, thereby implementing the opening/closing of the electronic expansion valve 100.

The valve needle assembly 20 further comprises a first spring seat 23, a second spring seat 24, an elastic part 25 and a guide seat 26, the guide seat 26 is mounted on the valve needle sleeve 21 and is matched with the screw rod assembly 30, the elastic part 25 is arranged between the first spring seat 23 and the second spring seat 24, and the second spring seat 24 is abutted to the valve needle 22.

Further, the ball 27 is arranged between the second spring seat 24 and the valve needle 22, the ball 27 and the valve needle 22 are welded by spot welding, and the area of a friction contact surface between the second spring seat 24 and the valve needle 22 can be reduced by point contact between the ball 27 and the second spring seat 24, so that contact abrasion between the second spring seat 24 and the valve needle 22 is reduced, and the reliability and stability of the electronic expansion valve 100 are improved.

The screw assembly 30 includes a nut socket 32, and a screw 31 installed in the nut socket 32. The screw 31 has a first end and a second end which are oppositely arranged, the first end of the screw 31 is connected with the rotor assembly 50, and the second end of the screw 31 is arranged in the nut sleeve 32 in a penetrating way and is connected with the first spring seat 23. Nut sleeve 32 has one end mounted to coupling tab 17 and the other end positioned within sleeve 40.

Further, the second cylindrical section 163 extends into the nut sleeve 32 from the first end of the nut sleeve 32 and is fixedly connected to the nut sleeve 32. Preferably, the fixed connection comprises any one of a threaded connection or an interference or transition fit. In the present embodiment, the second cylindrical section 163 is in interference fit with the nut sleeve 32, so that the nut sleeve 32 is guided by the second cylindrical section 163, and the axis of the nut sleeve 32 is arranged to coincide with the axis of the guide sleeve 16 and the axis 103 of the valve body 10.

It will be appreciated that the valve body 10 is guided by the first cylindrical section 162, and the nut sleeve 32 is guided by the second cylindrical section 163; therefore, the axes of the valve body 10, the guide sleeve 16 and the nut sleeve 32 are overlapped to ensure the coaxiality between the valve needle 22 and the valve port 11, so that in the process of movement, the collision between the valve needle 22 and the valve body 10 is reduced, the abrasion of the valve needle 22 and other parts is reduced, and the service life of the electronic expansion valve 100 is prolonged.

The nut sleeve 32 is in threaded connection with the screw 31, and since the nut sleeve 32 is welded on the connecting piece 17, when the screw 31 rotates under the driving of the rotor assembly 50, due to the matching relationship of the nut and the screw rod formed between the nut sleeve 32 and the screw 31, the screw 31 and the rotor assembly 50 fixedly connected with the screw 31 and the like can move in a stretching manner along the axial direction of the screw 31, so that the movement process of driving the valve needle assembly 20 by the screw 31 is realized.

The nut sleeve 32 can be internally provided with a second positioning step 321, and the second cylindrical section 163 extends into the nut sleeve 32 and abuts against the second positioning step 321, so that the installation reliability of the guide sleeve 16 is improved, and the axial movement and the noise of the guide sleeve 16 are avoided.

The rotor assembly 50 includes a rotor 51 located in the sleeve 40, an adapter plate 52 for mounting the screw 31, a limiting member 53 for limiting a rotation angle of the rotor 51, and a driving plate 54 mounted on the adapter plate 52. The rotor 51 is mounted on the adapter plate 52. The adapter plate 52 is fixedly connected with the screw 31 by welding and the like.

The limiting member 53 includes a spring 531 sleeved on the nut sleeve, a guiding plate 54 and a stop ring 532 mounted on the nut sleeve 32. One end of the spring 531 is connected to the connecting piece 17. The other end of the spring 531 is provided with a stopper 531 a. The stop ring 532 is wound around the spring 531. Preferably, a stop table 322 is provided on the outer wall of the nut case 32, and the stop table 322 is engaged with a stop ring 532 to limit the rotation angle of the rotor 51.

During the rotation of the rotor 51 along the axis 103 to drive the screw 31 with the closing of the needle 22, the stop ring 532 moves along the spring 531; the stop ring 532 abuts against the stop table 322 to limit the rotation angle of the rotor 51, which is the lower limit of the rotor 51. During the rotation of the rotor 51 along the axis 103 to drive the screw 31 to drive the valve needle 22 to close the valve port 11, the stop ring 532 moves along the spring 531; the stop ring 532 abuts against the stop portion 531a to limit the rotation angle of the rotor 51, which is an upper limit of the rotor 51.

The stator assembly includes a coil and other components, and is configured to generate a magnetic field when energized, and to drive the rotor 51 to rotate under the action of the magnetic field, so as to drive the screw 31 to rotate.

In this embodiment, the valve body 10 is further provided with a fixing plate 18, the fixing plate 18 is used for bearing and fixing the stator assembly, the fixing plate 18 is further provided with a plurality of mounting holes 181, and the mounting holes 181 are used for fixing the stator assembly on the fixing plate 18.

In this embodiment, the electronic expansion valve 100 is an electric electronic expansion valve, the rotor 51 is a motor rotor made of a permanent magnet in a stepping motor, the stator assembly is a motor stator in the stepping motor, the stepping motor receives a logic digital signal provided by a control circuit and then transmits the signal to each phase coil of the motor stator, and the motor rotor made of the permanent magnet is subjected to a magnetic moment to generate a rotary motion, so that a motion process that the stator assembly drives the rotor assembly to rotate is realized.

The working principle of the electronic expansion valve 100 is explained as follows:

after the stator assembly is electrified, a magnetic field is generated, the rotor 51 made of a magnetic material rotates under the driving of the magnetic field, the rotor 51 is fixedly connected with the screw 31 through the guide sheet 54, the rotation of the rotor 51 drives the screw 31 to rotate, the screw 31 and the nut sleeve 32 form nut-screw matching, and the nut sleeve 32 is fixedly arranged on the valve body 10, so that the rotation of the screw 31 relative to the nut sleeve 32 can drive the screw 31 to move relative to the nut sleeve 32 in a telescopic manner, thereby realizing the working process that the stator assembly drives the rotor assembly 50 to move, and the rotor assembly 50 drives the screw assembly 30 to move again;

the screw 31 moves in a telescopic manner relative to the axis 103 direction of the valve body 10 and then drives the valve needle 22 to move through the elastic element 25, the valve needle 22 moves towards the valve port 11 formed in the valve body 10 under the driving of the screw 31, and when the valve needle 22 closes the valve port 11, that is, the valve cavity 12 is disconnected from the valve port 11, the electronic expansion valve 100 is closed; when the valve needle 22 releases the closure of the valve port 11, that is, the valve cavity 12 is communicated with the valve port 11, the electronic expansion valve 100 is opened, and the opening aperture of the valve port 11 in the electronic expansion valve 100 is relatively small, so that the flow rate of the fluid medium is reduced, and the throttle and pressure reduction process of the electronic expansion valve 100 on the fluid medium is realized.

The electronic expansion valve 100 provided by the invention adopts an integrated valve body, and the valve core seat and the sleeve seat of the traditional electronic expansion valve 100 are integrated by using the integrated valve body, so that the axial assembling times of the electronic expansion valve 100 are reduced, the possibility of reducing the coaxiality of all parts of the electronic expansion valve 100 due to multiple assembling is reduced, and the coaxiality of all parts of the electronic expansion valve 100 is improved. Moreover, because the number of parts is reduced, the valve opening performance of the electronic expansion valve 100 can be ensured, the installation is more convenient, and the reliability and the stability of the whole product are improved.

In the present embodiment, the valve port 11 is disposed coaxially with the valve body 10, the end named with the valve port 11 is a first end 104 of the valve body 10, the other end of the valve body 10 opposite to the first end 104 is named as a second end 105, and the valve port 11 is opened along a direction in which the second end 105 points to the first end 104. Due to the adoption of the processing mode of upper end feed, the valve port of the valve body 10 only needs to be clamped once during processing, so that the clamping times of the valve port of the valve body 10 in the manufacturing process are reduced, the positioning error of the valve port of the valve body 10 in the processing process is reduced, and the coaxiality of the valve port 11 and the valve body 10 is improved.

Moreover, because the valve port 11 is directly formed on the valve body 10, compared with a conventional electronic expansion valve, the welding fixation between the valve seat core with the valve port and the valve body is reduced, the integrity of the valve body 10 is improved due to the reduction of the number of welding, and the reliability and the stability of the electronic expansion valve 100 are improved.

The end of the valve port 11 close to the second end 105 of the valve body 10 is provided with a first chamfer 106, and due to the opening of the first chamfer 106, the part of the valve port 11 close to the second end 105 of the valve body 10 forms an open structure, so that the sealing performance of the valve needle 22 in the valve port 11 can be improved, the internal leakage of the electronic expansion valve 100 is reduced, and the accuracy of the electronic expansion valve 100 in controlling the fluid flow is improved.

The end of the valve port 11 away from the second end 105 of the valve body 10 is provided with a second chamfer 107, and due to the opening of the first chamfer 106 and the second chamfer 107, burrs brought out in the processing process of the valve port 11 are removed, so that a fluid medium has a flow characteristic when passing through the valve port 11.

Preferably, the first chamfer 106 and the second chamfer 107 are both less than 0.1 mm.

In addition, in order to further insulate noise, the wall thickness dimension of the valve body 10 in contact with the guide sleeve 16 is 30% to 80% of the radial dimension of the valve body 10. The wall thickness dimension that valve body 10 and uide bushing 16 contacted sets up 30% to 80% of valve body 10 radius dimension, and the noise of isolation that can be better seals up the circulation noise of fluid medium in the inside of valve body 10. The wall thickness of the valve body 10 is too small, and the sealing effect on noise is relatively poor; the wall thickness of the valve body 10 is too large to facilitate the fixed installation of the valve needle assembly 20 and other components in the valve body 10.

Preferably, the wall thickness dimension of the valve body 10 in contact with the guide sleeve 16 is 80% of the radial dimension of the valve body 10.

The present invention further provides an air conditioning system (not shown) using the electronic expansion valve 100, and the air conditioning system uses the electronic expansion valve 100, so that the reliability and stability of the whole system are improved, and the air conditioning system has a wider application prospect.

The electronic expansion valve 100 provided by the invention is directly provided with the valve port 11 on the valve body 10, the valve port 11 is coaxially arranged with the valve body 10, and the valve port 11 is arranged along the direction of the second end 105 pointing to the first end 104 by feeding. Due to the adoption of the processing mode of upper end feed, the valve body 10 only needs to be clamped once during processing, so that the clamping times of the valve body 10 in the manufacturing process are reduced, the positioning error of the valve body 10 in the processing process is reduced, and the coaxiality of the valve body 10 and the valve port 11 is improved. The electronic expansion valve 100 and the air conditioning system using the electronic expansion valve 100 have high stability and reliability, and have wide application prospects.

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

1. An electronic expansion valve is characterized by comprising a valve body, wherein a valve port is formed in the valve body and is coaxial with the valve body; the valve body is provided with a valve port, one end of the valve body, which is provided with the valve port, is named as a first end, one end of the valve body, which is opposite to the first end, is named as a second end, and the valve port is arranged along the direction of the second end pointing to the first end in a feeding mode.

2. The electronic expansion valve of claim 1, wherein an end surface of the valve port adjacent to the second end is provided with a first chamfer.

3. The electronic expansion valve of claim 2, wherein an end surface of the valve port remote from the second end is provided with a second chamfer.

4. The electronic expansion valve of claim 3, wherein the first chamfer and the second chamfer are each less than 0.1 mm.

5. The electronic expansion valve of claim 1, further comprising a guide sleeve in contact with the valve body, wherein the wall thickness of the valve body in contact with the guide sleeve has a dimension of 30% to 80% of the radius of the valve body.

6. The electronic expansion valve of claim 5, wherein the wall thickness of the valve body in contact with the guide sleeve has a dimension of 80% of the radius of the valve body.

7. The electronic expansion valve of claim 5, wherein the guide sleeve is an interference fit with the valve body.

8. The electronic expansion valve of claim 1, further comprising a sleeve, wherein the sleeve is fixedly attached to the valve body.

9. The electronic expansion valve of claim 8, wherein the sleeve is fixedly attached to the valve body by welding.

10. An air conditioning system comprising an electronic expansion valve, wherein the electronic expansion valve is according to any of claims 1-9.