CN109425151B

CN109425151B - Electronic expansion valve and refrigeration system with same

Info

Publication number: CN109425151B
Application number: CN201710765443.3A
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Current assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Priority date: 2017-08-30
Filing date: 2017-08-30
Publication date: 2020-08-28
Anticipated expiration: 2037-08-30
Also published as: CN109425151A

Abstract

The invention provides an electronic expansion valve and a refrigerating system with the same. Wherein, electronic expansion valve includes: a valve body; the valve needle is provided with a closing position and an opening position, the bottom of the valve needle is provided with a second valve port, the valve needle is provided with an accommodating space, a first overflowing channel and a second overflowing channel, the first overflowing channel is positioned on the side wall of the valve needle and communicated with the outside, and the second overflowing channel is positioned on the circumferential outer side of the second valve port and communicated with the second valve port; a valve stem movable up and down to regulate flow at the second valve port; a driving part driving the valve rod to move up and down; and the elastic element is arranged in the valve needle and abutted between the valve needle and the valve rod, and when the valve rod moves upwards relative to the valve needle and fluid flows into the accommodating space from the first valve port, the elastic element applies elastic force to the valve needle so that the valve needle is abutted at the first valve port. By applying the technical scheme of the invention, the problem of poor small flow regulation effect of the electronic expansion valve in the prior art can be effectively solved.

Description

Electronic expansion valve and refrigeration system with same

Technical Field

The invention relates to the field of refrigeration, in particular to an electronic expansion valve and a refrigeration system with the same.

Background

As shown in fig. 1, in the prior art, a speed-reducing electronic expansion valve for a variable-frequency air conditioner mainly comprises two parts, one part is a valve body part for flow rate regulation, and the other part is a coil part for driving. Wherein the coil part includes: the permanent magnet type stepping motor, the gear reducer with three-stage speed reduction and the screw pair structure for converting the rotary motion of the motor into the vertical motion of the screw rod are arranged. The valve body part comprises a valve seat 1, a valve rod 8, a valve needle 2, a stopping component 3 arranged between the valve rod 8 and the valve needle 2, a corrugated pipe 7 for controlling the lifting of the valve needle 2 and other core components. The valve seat 1 is provided with a first valve port 4, and the valve needle 2 has a closing position abutting against the first valve port 4 and an opening position opening the first valve port 4. The valve needle 2 and the valve rod 8 move synchronously when contacted by the stopping component 3, and the valve rod 8 can move up and down relative to the valve needle 2 when the valve needle 2 is positioned at the closing position. The valve needle 2 is provided with a second valve port 5 communicated with the first valve port 4 and a overflowing channel 9. The following describes several operating states of the electronic expansion valve: when the valve needle 2 is in the open position, the electronic expansion valve is in a fully open state. When the valve needle 2 is in the closed position and the valve rod 8 abuts on the second valve port 5, the fluid can only enter the valve needle 2 or flow out of the valve needle 2 through the flow passage 9, so that the electronic expansion valve is in a state of a fixed small flow (the flow is determined by the size of the flow passage). When small flow regulation is needed, the valve rod 8 moves upwards under the action of the bellows 7, and the flow is changed by the movement of the regulating valve rod 8, so that the small flow regulation is realized. When the valve rod 8 moves to a preset position, the stop component 3 arranged on the valve rod 8 contacts with the valve needle 2 to drive the valve needle 2 to move towards the direction far away from the first valve port 4, so that large-flow regulation is realized. Therefore, during small flow regulation, the valve needle 2 should always abut on the first valve port 4. However, when a small flow rate adjustment is required and the fluid enters the first valve port 4 from the direction of N, the valve needle 2 may move in a direction away from the first valve port 4 in advance due to the upward pushing effect of the pressure difference, so that the small flow rate adjustment is poor and the flow rate adjustment is inaccurate.

Disclosure of Invention

The invention mainly aims to provide an electronic expansion valve and a refrigeration system with the same, and aims to solve the problem that the electronic expansion valve in the prior art is poor in small flow regulation effect.

In order to achieve the above object, according to one aspect of the present invention, there is provided an electronic expansion valve comprising: a valve body having a first valve port; the valve needle is provided with a closing position abutting against the first valve port and an opening position avoiding the first valve port, the bottom of the valve needle is provided with a second valve port communicated with the first valve port, the valve needle is provided with an accommodating space, a first overflowing channel and a second overflowing channel, the first overflowing channel is positioned on the side wall of the valve needle and communicated with the outside, and the second overflowing channel is positioned on the circumferential outer side of the second valve port and communicated with the second valve port; the valve rod is at least partially arranged in the accommodating space in a penetrating mode, and can move up and down to adjust the flow at the second valve opening; the valve needle and the valve rod synchronously move when being contacted through the stopping component, and the valve rod can move up and down relative to the valve needle when the valve needle is positioned at the closing position; and the elastic element is arranged in the valve needle and abutted between the valve needle and the valve rod, is compressed when the valve rod moves downwards relative to the valve needle, and exerts elastic force on the valve needle to enable the valve needle to abut at the first valve port when the valve rod moves upwards relative to the valve needle and fluid flows into the accommodating space from the first valve port.

Furthermore, the elastic element is a spring, the spring is sleeved on the valve rod, a step surface is arranged on the valve rod, a first end of the spring is abutted against the step surface, and a second end of the spring is abutted against the valve needle.

Further, the valve needle comprises a valve needle body and a valve seat core arranged in the valve needle body, the second valve port and the second overflowing channel are both arranged on the valve seat core, and the second end of the spring abuts against the valve seat core.

Further, the electronic expansion valve further includes: the valve needle sleeve is fixedly arranged on the upper portion of the valve needle body, a first avoidance hole for avoiding the valve rod is formed in the valve needle sleeve, and an accommodating space is formed by the inner wall of the valve needle body, the lower surface of the valve needle sleeve and the upper surface of the valve seat core in a surrounding mode.

Further, the electronic expansion valve further includes: first amortization portion sets up in accommodation space, and first amortization portion includes first amortization structure and second amortization structure, and first amortization structure is located the top of second amortization structure, and first amortization structure shutoff is first to flow the passageway, and the passageway is flowed in second amortization structure shutoff second, and the second end of spring is through second amortization structure butt on the valve seat core.

Further, the electronic expansion valve further includes: and the sealing part is arranged between the first silencing structure and the second silencing structure to separate the first silencing structure and the second silencing structure.

Further, the sealing portion is a sealing ring, a second avoidance hole which avoids the valve rod is formed in the sealing ring, and the circumferential side wall of the sealing portion is attached to the inner wall of the valve needle body.

Further, the electronic expansion valve further includes: and the second silencing part is arranged below the second valve port and seals the second valve port and the second overflowing channel.

Further, the compression amount of the elastic element is less than or equal to the stroke of the valve rod moving relative to the valve needle.

According to another aspect of the present invention, there is provided a refrigeration system comprising: the electronic expansion valve is the electronic expansion valve.

By applying the technical scheme of the invention, the electronic expansion valve comprises an elastic element arranged between the valve needle and the valve rod. When the valve stem moves downwards relative to the valve needle, the resilient element is compressed. When the valve stem moves upward relative to the valve needle and fluid flows from the first valve port into the receiving space, the elastic element applies an elastic force to the valve needle to abut the valve needle at the first valve port. The valve needle moves upward together with the valve rod until the valve rod contacts with the valve needle through the stopping component, and the first valve port is opened. In the process of small flow regulation, the direction of the elastic force applied to the valve needle by the elastic element is opposite to the direction of the pressure generated by the fluid, so that the pressure generated by the fluid can be counteracted, and the valve needle can be blocked at the first valve port by the gravity of the valve needle. Therefore, when the valve rod moves upwards relative to the valve needle and fluid flows into the accommodating space from the first valve port, the valve needle cannot leave the first valve port in advance, so that the flow rate is adjusted more accurately, and the problem of poor small flow rate adjusting effect of the electronic expansion valve in the prior art is solved. In addition, the elastic element is arranged in the valve needle, so that the assembly is easier, and the assembly efficiency is improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic view showing a partial longitudinal cross-sectional structure of an electronic expansion valve in the related art;

fig. 2 is a schematic longitudinal sectional view illustrating a valve stem of an embodiment of an electronic expansion valve according to the present invention when it is displaced from a second valve port;

fig. 3 shows an enlarged schematic view of the electronic expansion valve of fig. 2 at a;

FIG. 4 is a schematic diagram showing a longitudinal cross-sectional view of the valve stem of FIG. 2 blocking the second valve port;

fig. 5 shows an enlarged schematic view of the electronic expansion valve of fig. 4 at B;

fig. 6 is a partial cross-sectional schematic view of the valve stem of the electronic expansion valve of fig. 2 mated with the valve needle via a stop member;

fig. 7 shows a schematic partial cross-sectional view of the valve stem of the electronic expansion valve of fig. 2 as it moves downward L1 relative to the valve needle; and

fig. 8 is a perspective view illustrating an elastic member of the electronic expansion valve of fig. 2.

Wherein the figures include the following reference numerals:

10. a valve body; 11. a first valve port; 20. a valve needle; 21. a valve needle body; 211. a first flow passage; 22. a valve seat core; 221. a second valve port; 222. a second flow passage; 23. an accommodating space; 30. a valve stem; 31. a step surface; 40. a first muffling section; 41. a first sound attenuating structure; 42. a second sound attenuating structure; 60. a sealing part; 70. a second sound-deadening section; 80. a drive section; 90. a stopper member; 100. an elastic element; 120. a bellows; 140. a valve needle sleeve; 150. a first conduit; 160. a second conduit.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 2 to 5, the electronic expansion valve of the present embodiment includes: a valve body 10, a needle 20, a valve stem 30, a driving part 80, and an elastic member 100. Wherein the valve body 10 has a first valve port 11. The valve needle 20 has a closing position abutting against the first valve port 11 and an opening position avoiding the first valve port 11, the bottom of the valve needle 20 has a second valve port 221 communicating with the first valve port 11, the valve needle 20 has an accommodating space 23 and a first excess flow channel 211 and a second excess flow channel 222 communicating with the accommodating space 23, the first excess flow channel 211 is located on the side wall of the valve needle 20 and communicates with the outside, and the second excess flow channel 222 is located on the circumferential outer side of the second valve port 221 and communicates with the second valve port 221. At least a part of the valve rod 30 is inserted into the receiving space 23, and the valve rod 30 can move up and down to adjust the flow rate at the second valve port 221. The driving part 80 drives the valve rod 30 to move up and down, wherein a stopper member 90 is provided between the valve rod 30 and the valve needle 20 to move the valve needle 20 and the valve rod 30 synchronously when they are contacted by the stopper member 90, and the valve rod 30 can move up and down relative to the valve needle 20 when the valve needle 20 is at the closing position. The elastic element 100 is disposed in the valve needle 20 and abuts between the valve needle 20 and the valve stem 30, when the valve stem 30 moves downward relative to the valve needle 20, the elastic element 100 is compressed, and when the valve stem 30 moves upward relative to the valve needle 20 and fluid flows from the first valve port 11 into the accommodating space 23, the elastic element 100 applies an elastic force to the valve needle 20 to abut the valve needle 20 at the first valve port 11.

With the solution of the present embodiment, the electronic expansion valve includes an elastic element 100 disposed between the valve needle 20 and the valve rod 30. When the valve stem 30 moves downwards relative to the valve needle 20, the resilient element 100 will be compressed. When the valve stem 30 moves upward relative to the valve needle 20 and fluid flows from the first valve port 11 into the accommodating space 23, the elastic element 100 applies an elastic force to the valve needle 20 to abut the valve needle 20 at the first valve port 11. The valve needle 20 is not moved upward together with the valve rod 30 until the valve rod 30 contacts the valve needle 20 via the stopper member, and the first valve port 11 is opened. During the small flow rate adjustment, the direction of the elastic force applied to the valve needle 20 by the elastic element 100 is opposite to the direction of the pressure generated by the fluid, so that the pressure generated by the fluid can be counteracted, and the valve needle 20 can be blocked at the first valve port 11 by the self gravity. Therefore, when the valve rod 30 moves upward relative to the valve needle 20 and the fluid flows into the accommodating space 23 from the first valve port 11, the valve needle 20 does not leave the first valve port 11 in advance, so that the adjustment of the flow rate is more accurate, and the problem of poor small-flow rate adjustment effect of the electronic expansion valve in the prior art is solved. In addition, the arrangement of the resilient element 100 within the valve needle 20 is easier to assemble, thereby improving assembly efficiency.

In this embodiment, the electronic expansion valve further includes a first pipe 150 and a second pipe 160, the first pipe communicates with the accommodating space 23 through the first port 11, and the second pipe 160 communicates with the accommodating space 23.

The fully open state, the large flow regulation state, the small flow regulation state and the fixed small flow state are described as follows:

a fully open state: when the valve needle 20 opens the first valve port 11 and the distance from the first valve port 11 is greater than the predetermined distance, the fluid flow rate from the electronic expansion valve is large, and the influence of the movement of the valve needle 20 on the fluid flow rate is very small. The above state is the fully open state. When the electronic expansion valve is in a fully open state, most of the fluid directly enters the valve body 10 and then flows out of the pipeline, and a small amount of the fluid enters the accommodating space 23 and then flows out of the pipeline.

And (3) large flow regulation state: when the valve needle 20 opens the first valve port 11 and is located at a distance from the first valve port 11 that is less than the predetermined distance, the movement of the valve needle 20 has a greater influence on the flow rate of the fluid. The above state is the large flow regulation state. When the electronic expansion valve is in a large flow regulation state, one part of fluid directly enters the valve body 10 and then flows out of the pipeline, and the other part of fluid enters the accommodating space 23 and then flows out of the pipeline.

And (3) a small flow regulation state: when the valve needle 20 abuts at the first valve port 11 and the valve rod 30 does not abut at the second valve port 221, the fluid flow rate from the electronic expansion valve is small, and the movement of the valve rod 30 can regulate the fluid flow rate more accurately. The above state is the small flow regulation state. When the electronic expansion valve is in a low-flow regulation state, a part of the fluid enters the accommodating space 23 through the second valve port 221 and then flows out of the pipeline, and the other part of the fluid enters the accommodating space 23 through the second flow passage 222 and then flows out of the pipeline.

Fixed low flow state: when the needle 20 abuts at the first port 11 and the stem 30 abuts at the second port 221. The flow rate of the fluid flowing out of the electronic expansion valve is small and is a fixed value. The above state is the fixed low flow state. When the electronic expansion valve is in a fixed low flow state, all the fluid enters the accommodating space 23 through the second flow passage 222 and then flows out of the pipeline.

The operation of the electronic expansion valve is briefly described as follows:

fluid enters the receiving space 23 from the first conduit 150:

the electronic expansion valve changes from a full-open state to a fixed low-flow state:

first, the driving portion 80 drives the valve rod 30 to move downward, and the valve needle 20 moves downward in synchronization with the valve rod 30 through the stopper member 90 by the gravity. When the valve needle 20 abuts on the first valve port 11, the valve rod 30 continues to move downward, and at this time, the elastic element 100 is compressed, and the valve needle 20 is pressed at the first valve port 11 by the gravity and the elastic force thereof. When the valve rod 30 abuts against the second valve port 221, the electronic expansion valve reaches a state of a fixed small flow rate. At this time, the elastic element 100 is in the maximum compression state, and the upward elastic force of the elastic element 100 is smaller than the resultant force output by the driving portion 80, so that the valve rod 30 can be held at the abutment position (the position of abutment at the second valve port 221). When the electronic expansion valve is in a fixed small flow state, the fluid flows into the first valve port 11, the second overflow channel 222, the accommodating space 23, the first overflow channel 211, and finally flows out of the second pipe 160.

The electronic expansion valve changes from a fixed small flow state to a state full-open state:

first, the driving portion 80 drives the valve rod 30 to move upward, and before the stopper member 90 comes into contact with the valve needle 20, the valve needle 20 is simultaneously subjected to gravity and elastic force, wherein the elastic force can offset the upward differential pressure force generated by the fluid. Therefore, before the stopper member 90 contacts the valve needle 20, the valve needle 20 can be firmly pressed at the first valve port 11, so that the small flow regulation of the electronic expansion valve is more accurate. When the stopping member 90 contacts the valve needle 20, the valve needle 20 is hooked on the stopping member 90 by gravity, and the valve rod 30 drives the valve needle 20 to move upward together through the stopping member 90 until the valve needle 20 moves upward to a predetermined position.

(ii), fluid enters the receiving space 23 from the second pipe 160:

first, the driving portion 80 drives the valve rod 30 to move downward, and the valve needle 20 moves downward in synchronization with the valve rod 30 through the stopper member 90 by the gravity. When the valve needle 20 abuts on the first valve port 11, the valve rod 30 continues to move downward, at this time, the elastic element 100 is compressed, the pressure difference force generated by the fluid is offset by the elastic force of the elastic element 100, and the valve needle 20 is pressed at the first valve port 11 under the action of its gravity, without additionally increasing the output force of the driving part 80. When the valve rod 30 abuts against the second valve port 221, the electronic expansion valve reaches a state of a fixed small flow rate. When the electronic expansion valve is in a fixed small flow state, the fluid flows into the first flow passage 211, the accommodating space 23, the second flow passage 222, the first valve port 11 in sequence, and finally flows out of the first pipe 150.

first, the driving portion 80 drives the valve rod 30 to move upward, and before the stopper member 90 contacts the valve needle 20, the valve needle 20 is simultaneously pressed at the first valve port 11 by gravity, the elastic force of the elastic element 100, and the differential pressure force generated by the fluid. Therefore, before the stopper member 90 contacts the valve needle 20, the valve needle 20 can be firmly pressed at the first valve port 11, so that the small flow regulation of the electronic expansion valve is more accurate. When the stopping member 90 contacts the valve needle 20, the valve needle 20 is hooked on the stopping member 90 by gravity, and the valve rod 30 drives the valve needle 20 to move upward together through the stopping member 90 until the valve needle 20 moves upward to a predetermined position.

As shown in fig. 2 to 5 and 8, in the present embodiment, the elastic element 100 is a spring, the spring is sleeved on the valve rod 30, the valve rod 30 has a stepped surface 31, a first end of the spring abuts against the stepped surface 31, and a second end of the spring abuts against the valve needle 20. Preferably, in the present embodiment, the valve rod 30 includes a first column section and a second column section connected to each other, wherein the first column section is located above the second column section, and the diameter of the first column section is larger than that of the second column section. The junction of the first and second column sections forms a stepped surface 31. The structure is simple, and the processing and the assembly are easy. During assembly, the spring is sleeved on the second column section, and the first end of the spring is abutted against the stepped surface 31.

As shown in fig. 3 and 5, in the present embodiment, the needle 20 includes a needle body 21 and a seat core 22 provided in the needle body 21, the second port 221 and the second transfer passage 222 are both provided on the seat core 22, and the second end of the spring abuts on the seat core 22. The structure is simple and the processing is convenient.

As shown in fig. 3 and 5, in the present embodiment, the electronic expansion valve further includes a needle sleeve 140. The valve needle sleeve 140 is fixedly arranged on the upper portion of the valve needle body 21, a first avoidance hole avoiding the valve rod 30 is arranged on the valve needle sleeve 140, and the inner wall of the valve needle body 21, the lower surface of the valve needle sleeve 140 and the upper surface of the valve seat core 22 jointly enclose an accommodating space 23. The structure is simple and easy to assemble.

The small flow unit arranged independently is easy to generate abnormal noise, so the problem is solved. As shown in fig. 3 and 5, in the present embodiment, the electronic expansion valve further includes a first sound-deadening portion 40. The first silencing part 40 is disposed in the accommodating space 23, the first silencing part 40 includes a first silencing structure 41 and a second silencing structure 42, the first silencing structure 41 is located above the second silencing structure 42, the first silencing structure 41 blocks the first flow-through passage 211, and the second silencing structure 42 blocks the second flow-through passage 222. Specifically, when the electronic expansion valve is in a fixed low flow state and fluid flows into the first port 11 from the first pipe 150, the fluid flowing into the first port 11 will continue to flow into the second overflow channel 222. The fluid flowing out from the second flow passage 222 will enter the second silencing structure 42 for the first silencing, and the fluid after the first silencing will flow into the first silencing structure 41 for the second silencing. Likewise, when the electronic expansion valve is in a fixed low flow state and fluid flows into the valve body 10 from the second pipe 160, the fluid flowing into the valve body 10 flows into the first transfer passage 211. The fluid flowing out from the first flow passage 211 enters the first silencing structure 41 for the first silencing, and the fluid after the first silencing flows into the second silencing structure 42 for the second silencing. The structure enables the fluid flowing into the accommodating space 23 from the positive direction and the negative direction to be secondarily silenced, so that abnormal noise is greatly reduced, and user experience is improved.

Further, in the present embodiment, the second end of the spring abuts on the valve seat core 22 through the second sound deadening structure 42. Specifically, during assembly, the bellows 120 and the valve needle sleeve 140 are sequentially sleeved on the valve rod 30, and then the stop member 90 is installed in the installation groove of the valve rod 30. The stop member 90 is capable of stopping the needle sleeve 140 to prevent the needle sleeve 140 from being removed from the valve stem 30. And then the spring is sleeved on the second column section to form a mounting assembly. Finally, the valve rod 30 is extended into the valve needle 20, and when the valve rod 30 is moved down to a predetermined position, the valve needle sleeve 140 is welded to the valve needle 20, thereby completing the assembly. At this time, the first end of the spring abuts on the stepped surface 31, and the second end of the spring abuts on the second silencing structure 42.

As shown in fig. 3 and 5, in the present embodiment, the electronic expansion valve further includes: and a sealing part 60 disposed between the first sound deadening structure 41 and the second sound deadening structure 42 to separate the first sound deadening structure 41 from the second sound deadening structure 42. Specifically, when the valve needle 20 is in the closed position and the valve rod 30 abuts at the second valve port 221, the electronic expansion valve is in a fixed low-flow state. When the fluid enters from the first transfer passage 211, a part of the fluid is silenced by the first silencing structure 41 and then flows into the accommodating space 23. The fluid flowing into accommodation space 23 continues to flow toward second sound deadening structure 42. Another part of the fluid is blocked by the second sealing portion 60, so that it is repeatedly silenced in the first silencing structure 41 until it enters the accommodating space 23. The above structure therefore has the following two advantages: first, the sealing part 60 is provided to make the first sound-deadening part 40 capable of being reused, thereby improving the utilization rate and the sound-deadening effect. Secondly, the sealing part 60 is arranged to make the effective distance of the fluid for sound attenuation longer, and the fluid is effectively prevented from directly flowing out from the gap between the first sound attenuation structure 41 and the second sound attenuation structure 42.

As shown in fig. 3 and 5, in the present embodiment, the sealing portion 60 is a sealing ring, the sealing ring has a second avoidance hole that avoids the valve rod 30, and a circumferential side wall of the sealing portion 60 is attached to an inner wall of the needle body 21. The structure is simple, and the processing and the assembly are easy. And the above structure further blocks the gap between the first silencing structure 41 and the second silencing structure 42, thereby further improving the silencing effect.

As shown in fig. 3 and 5, in the present embodiment, the electronic expansion valve further includes a second sound-deadening portion 70. The second silencing part 70 is disposed below the second valve port 221 and blocks the second valve port 221 and the second flow passage 222. Specifically, when the electronic expansion valve is in a fixed low flow state and fluid flows into the first port 11 from the first pipe 150, the fluid flowing into the first port 11 will be muffled for the first time through the second muffling portion 70. The first muffled fluid will continue to flow into the second flow channel 222. The fluid flowing out from the second flow passage 222 will enter the second silencing structure 42 for the second silencing, and the fluid after the second silencing will flow into the first silencing structure 41 for the third silencing. Likewise, when the electronic expansion valve is in a fixed low flow state and fluid flows into the valve body 10 from the second pipe 160, the fluid flowing into the valve body 10 flows into the first transfer passage 211. The fluid flowing out from the first flow passage 211 enters the first silencing structure 41 for the first silencing, and the fluid after the first silencing flows into the second silencing structure 42 for the second silencing. The twice silenced fluid flows out of the second flow passage 222. The discharged fluid enters the second silencing part 70 for the last silencing. The structure enables the fluid flowing into the accommodating space 23 from the positive direction and the negative direction to be silenced for three times, so that abnormal noise is greatly reduced, and user experience is improved. In addition, since the second silencing part 70 is blocked at the first valve port 11, when the electronic expansion valve is in a small flow rate regulation state, the fluid entering the accommodating space 23 can also be silenced, thereby further improving the silencing effect.

In the present embodiment, the first sound deadening structure 41, the second sound deadening structure 42, and the second sound deadening portion 70 are each a mesh sound deadening member. The structure can greatly eliminate and disperse vortex and air bubbles carried in the fluid, thereby better solving the problem of abnormal noise of the conventional electronic expansion valve during initial small-flow regulation.

As shown in fig. 6 to 8, in the present embodiment, the compression amount of the elastic element 100 is equal to or less than the stroke of the movement of the valve rod 30 with respect to the valve needle 20. In the present embodiment, the elastic element 100 is a spring. The valve stem needs to be moved downward when it is installed in the valve core. Since the first end of the spring is in abutting engagement with the stepped surface 31, it is necessary to overcome the spring force exerted upward by the spring when the valve stem 30 is moved downward. Since the spring force F ═ kx, where x denotes the amount of compression, the smaller the spring force overcome. The spring force to be overcome during installation is less and installation is easier if the amount of pre-compression of the spring is minimized. Specifically, L in fig. 6 is the distance between the lower surface of the stepped surface 31 and the upper surface of the second sound deadening structure 42, and if the precompression amount of the spring is to be as small as possible, the free length L3 of the spring needs to be equal to or less than L, i.e., L3 ≦ L. Fig. 7 shows the valve stem moved downwardly relative to the valve needle by L1, at which time the distance between the lower surface of the stepped surface 31 and the upper surface of the second sound attenuating structure 42 is L2. L2+ L1 ═ L, i.e., L-L2 ═ L1. Since L is not less than L3, L3-L2 are not more than L1, that is, the compression amount of the elastic element 100 is not more than the stroke of the valve rod 30 moving relative to the valve needle 20. In addition, the structure can simultaneously avoid the influence of the fluctuation of the elastic force value on the upper and lower output forces (the consistency of the elastic force value at the maximum compression in the tolerance range of the elastic component can be maintained).

Embodiments of a refrigeration system according to the present application include an electronic expansion valve. Wherein, the electronic expansion valve is the electronic expansion valve. Because the electronic expansion valve has the advantage of accurate flow regulation, the refrigeration system with the electronic expansion valve also has the advantage.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electronic expansion valve, comprising:

a valve body (10) having a first valve port (11);

a valve needle (20) having a closing position abutting against the first valve port (11) and an opening position avoiding the first valve port (11), a bottom of the valve needle (20) having a second valve port (221) communicating with the first valve port (11), the valve needle (20) having an accommodating space (23) and a first excess flow channel (211) and a second excess flow channel (222) communicating with the accommodating space (23), the first excess flow channel (211) being located on a side wall of the valve needle (20) and communicating with the outside, the second excess flow channel (222) being located circumferentially outside the second valve port (221) and communicating with the second valve port (221);

a valve rod (30) at least partially penetrating into the accommodating space (23), wherein the valve rod (30) can move up and down to adjust the flow rate at the second valve port (221);

a driving part (80) driving the valve rod (30) to move up and down, wherein a stopping component (90) is arranged between the valve rod (30) and the valve needle (20) so that the valve needle (20) and the valve rod (30) move synchronously when being contacted through the stopping component (90), and the valve rod (30) can move up and down relative to the valve needle (20) when the valve needle (20) is positioned at the closing position;

an elastic element (100) disposed inside the valve needle (20) and abutting between the valve needle (20) and the valve rod (30), when the valve rod (30) moves downward relative to the valve needle (20), the elastic element (100) is compressed, when the valve rod (30) moves upward relative to the valve needle (20) and fluid flows into the accommodating space (23) from the first valve port (11), the elastic element (100) applies an elastic force to the valve needle (20) to abut the valve needle (20) at the first valve port (11), and the direction of the elastic force is opposite to the direction of the pressure generated by the fluid to counteract the pressure generated by the fluid, so that the valve needle (20) can be blocked at the first valve port (11) by its own weight.

2. An electronic expansion valve according to claim 1, wherein the elastic element (100) is a spring, the spring is sleeved on the valve rod (30), the valve rod (30) has a stepped surface (31), a first end of the spring abuts against the stepped surface (31), and a second end of the spring abuts against the valve needle (20).

3. An electronic expansion valve according to claim 2, wherein the valve needle (20) comprises a valve needle body (21) and a valve seat core (22) arranged within the valve needle body (21), the second valve port (221) and the second transfer passage (222) are both arranged on the valve seat core (22), and a second end of the spring abuts on the valve seat core (22).

4. The electronic expansion valve of claim 3, further comprising:

the valve needle sleeve (140) is fixedly arranged on the upper portion of the valve needle body (21), a first avoidance hole which avoids the valve rod (30) is formed in the valve needle sleeve (140), and the accommodating space (23) is formed by enclosing the inner wall of the valve needle body (21), the lower surface of the valve needle sleeve (140) and the upper surface of the valve seat core (22) together.

5. The electronic expansion valve of claim 3, further comprising:

the first silencing part (40) is arranged in the accommodating space (23), the first silencing part (40) comprises a first silencing structure (41) and a second silencing structure (42), the first silencing structure (41) is located above the second silencing structure (42), the first flow-passing channel (211) is blocked by the first silencing structure (41), the second flow-passing channel (222) is blocked by the second silencing structure (42), and the second end of the spring abuts against the valve seat core (22) through the second silencing structure (42).

6. The electronic expansion valve of claim 5, further comprising:

a sealing portion (60) provided between the first sound deadening structure (41) and the second sound deadening structure (42) to partition the first sound deadening structure (41) and the second sound deadening structure (42).

7. The electronic expansion valve according to claim 6, wherein the sealing portion (60) is a sealing ring having a second avoidance hole for avoiding the valve rod (30), and a circumferential side wall of the sealing portion (60) is attached to an inner wall of the valve needle body (21).

8. The electronic expansion valve of claim 1, further comprising:

a second silencing part (70), wherein the second silencing part (70) is arranged below the second valve port (221) and seals the second valve port (221) and the second flow passage (222).

9. An electronic expansion valve according to claim 1, wherein the amount of compression of the resilient element (100) is equal to or less than the stroke of movement of the valve stem (30) relative to the valve needle (20).

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