WO2019042140A1

WO2019042140A1 - Electronic expansion valve and refrigerating system provided with same

Info

Publication number: WO2019042140A1
Application number: PCT/CN2018/100866
Authority: WO
Inventors: 王宇栋
Original assignee: 浙江三花智能控制股份有限公司
Priority date: 2017-08-30
Filing date: 2018-08-16
Publication date: 2019-03-07
Also published as: JP6889805B2; JP2020531769A

Abstract

Disclosed are an electronic expansion valve and a refrigerating system provided with the electronic expansion valve. The electronic expansion valve comprises: a valve body (10) provided with a first valve port (11); a valve needle (20), the bottom of the valve needle (20) being provided with a second valve port (221), the valve needle (20) being provided with an accommodation space (23), a first flow passage (211) and a second flow passage (222), the first flow passage (211) being located in a side wall of the valve needle (20), and the second flow passage (222) being in communication with the second valve port (221); a valve rod (30) capable of moving up and down to regulate the flow at the second valve port (221); a drive portion (80) for driving the valve rod (30) to move up and down; and an elastic component (100) arranged between the valve needle (20) and the valve rod (30) or arranged in the valve needle (20) and abutting between the valve needle (20) and the valve rod (30). When the valve rod (30) moves down relative to the valve needle (20), the elastic component (100) is compressed, and when the valve rod (30) moves up relative to the valve needle (20) and a fluid flows into the accommodation space (23) from the first valve port (11), the elastic component (100) applies an elastic force to the valve needle (20) so that the valve needle (20) abuts against the first valve port (11). The electronic expansion valve can effectively solve the problem of the poor effect of low-flow regulation of an electronic expansion valve.

Description

Electronic expansion valve and refrigeration system therewith

Technical field

The present invention relates to the field of refrigeration control, and in particular to an electronic expansion valve and a refrigeration system therewith.

Background technique

As shown in FIG. 1, in the background art, the deceleration type electronic expansion valve for an inverter air conditioner is mainly composed of two parts, one part is a valve body part for flow rate adjustment, and the other part is a coil part for driving. The coil part comprises: a permanent magnet type stepping motor, a gear reducer with three stages of deceleration, and a thread pair structure for converting a rotary motion of the motor into a vertical movement of the screw. The valve body portion includes a valve seat 1, a valve stem 8, a valve needle 2, a stopper member 3 provided between the valve stem 8 and the valve needle 2, and a core member such as a bellows 7 for controlling the valve needle 2 to be lifted and lowered. The valve seat 1 is provided with a first valve port 4 having a closed position abutting on the first valve port 4 and an open position opening the first valve port 4. When the valve needle 2 and the valve stem 8 are in contact with the stopper member 3, they move synchronously. When the valve needle 2 is in the closed position, the valve stem 8 can move up and down with respect to the valve needle 2. The valve needle 2 is provided with a second valve port 5 communicating with the first valve port 4 and an overcurrent passage 9. The following describes several working states of the electronic expansion valve: when the valve needle 2 is in the open position, the electronic expansion valve is fully open. When the valve needle 2 is in the closed position and the valve stem 8 abuts on the second valve port 5, the fluid can only enter the valve needle 2 or the valve needle 2 through the flow passage 9, so the electronic expansion valve is in a fixed small flow state. (The flow rate is determined by the size of the overcurrent channel). When small flow adjustment is required, the valve stem 8 moves upward under the action of the bellows 7, and the flow rate is changed by adjusting the formation of the movement of the valve stem 8, thereby realizing the adjustment of the small flow rate. When the valve stem 8 is moved to the predetermined position, the stopper member 3 provided on the valve stem 8 comes into contact with the valve needle 2, and the valve needle 2 is driven to move away from the first valve port 4, thereby realizing large flow rate adjustment. Therefore, during the small flow adjustment, the valve needle 2 should always abut against the first valve port 4. However, when a small flow adjustment is required and the fluid enters the first valve port 4 from N, the valve needle 2 may move in a direction away from the first valve port 4 in advance due to the upward thrust of the pressure difference, resulting in When the small flow rate is adjusted, part of the fluid flows directly into the valve seat 1 from the first valve port 11, so that the small flow adjustment effect is poor, and the flow rate adjustment is not accurate.

Summary of the invention

SUMMARY OF THE INVENTION A primary object of the present invention is to provide an electronic expansion valve and a refrigeration system therewith, which solves the problem of poor flow adjustment effect of the electronic expansion valve in the background art.

In order to achieve the above object, according to an aspect of the invention, an electronic expansion valve includes: a valve body having a first valve port; a valve needle having a closed position abutting the first valve port and escaping the first valve The open position of the mouth, the bottom of the valve needle has a second valve port communicating with the first valve port, the valve needle has a receiving space and a first over-current channel and a second over-current channel communicating with the receiving space, the first over-flow channel Located on the side wall of the valve needle and communicating with the outside, the second over-flow passage is located on the outer side of the second valve port and communicates with the second valve port; the valve stem is at least partially disposed in the accommodating space, and the valve stem can be up and down Moving to adjust the flow rate at the second valve port; the driving portion driving the valve rod to move up and down, wherein a stopper member is disposed between the valve stem and the valve needle to make the valve needle and the valve stem come into contact with the stopper member Synchronous movement, and when the valve needle is in the closed position, the valve stem can move up and down relative to the valve needle; the elastic element is disposed between the valve needle and the valve stem, or is disposed in the valve needle and abuts against the valve needle and the valve stem Between when the valve stem is opposite When the valve needle moves downward, the elastic member is compressed. When the valve stem moves upward relative to the valve needle, and the fluid flows from the first valve port into the accommodating space, the elastic member applies an elastic force to the valve needle to abut the valve needle. At the mouth of a valve.

Further, the elastic element is disposed between the valve needle and the valve stem, the elastic element is a spring, the first end of the spring abuts the valve stem, and the second end of the spring abuts the top of the valve needle.

Further, the electronic expansion valve further includes: a first gasket sleeved on the valve stem and synchronously moving with the valve stem, the first end of the spring abutting on the lower surface of the first gasket.

Further, the first washer includes a base section, a vertical section disposed on opposite sides of the base section and extending upward, and a horizontal section disposed at the top of the vertical section and extending outward, the spring is sleeved outside the vertical section, and the spring The first end abuts on the lower surface of the horizontal section.

Further, the valve stem includes a valve stem body and a stop structure disposed on the sidewall of the valve stem body, the electronic expansion valve further includes a bellows, the first end of the bellows being fixed on the valve body, and the second end of the bellows is The stop structure cooperates, the spring abuts the first washer against the second end of the bellows, and when the valve stem moves downward, the stop structure applies a downward force to the second end of the bellows, and the bellows is stretched, When the valve stem moves upward, the second end of the bellows exerts an upward force on the valve stem.

Further, the elastic member is disposed between the valve needle and the valve stem, the valve needle includes a valve needle body and a valve seat core disposed in the valve needle body, and the second valve port and the second flow passage are disposed on the valve seat core .

Further, the elastic element is a spring, the first end of the spring abuts the valve stem, and the electronic expansion valve further comprises: a valve sleeve, which is fixedly disposed on the upper part of the valve needle body, and the valve needle sleeve is provided with an escape hole for avoiding the valve stem The inner wall of the valve needle body and the lower surface of the valve needle sleeve together with the upper surface of the valve seat core enclose a receiving space, and the second end of the spring abuts on the upper surface of the valve needle sleeve.

Further, the valve needle body and the valve seat core are integrated.

Further, the elastic element is disposed between the valve needle and the valve stem, and the electronic expansion valve further includes: a first silencing portion disposed in the accommodating space, the first silencing portion including the first silencing structure and the second silencing structure, the first silencing The structure is located above the second silencing structure, the first silencing structure blocks the first overcurrent channel, and the second silencing structure blocks the second overcurrent channel.

Further, the electronic expansion valve further includes: a second silencing portion disposed under the second valve port and blocking the second valve port and the second overcurrent channel.

Further, the amount of compression of the elastic member is less than or equal to the stroke of the valve stem relative to the movement of the valve needle.

Further, the elastic member is disposed between the valve needle and the valve stem, the elastic member is a disc spring, the disc spring is tapered, the disc spring is gradually contracted inward from bottom to top, and the upper end of the disc spring abuts the valve stem The lower end of the disc spring abuts the valve needle.

Further, the elastic element is disposed between the valve needle and the valve stem, and the electronic expansion valve further includes: a second washer sleeved on the valve stem and synchronously moving with the valve stem, the upper end of the disc spring abutting on the second washer On the lower surface.

Further, the valve stem is provided with a mounting groove on which the second washer is mounted, and the disc spring abuts the second washer against the groove wall of the mounting groove.

Further, the second washer is provided with a mounting hole, the valve rod is disposed in the mounting hole, and the second washer is further provided with an opening, the opening is in communication with the mounting hole, and the width H of the connection between the opening and the mounting hole is smaller than the valve stem The diameter, the width of the opening gradually increases from the inside to the outside.

Further, the elastic element is disposed in the valve needle and abuts between the valve needle and the valve stem, the elastic element is a spring, the spring is sleeved on the valve stem, and the valve stem has a step surface, the first end and the step surface of the spring Abut, the second end of the spring abuts on the valve needle.

Further, the valve needle includes a valve needle body and a valve seat core disposed in the valve needle body, the second valve port and the second flow passage are both disposed on the valve seat core, and the second end of the spring abuts on the valve seat core on.

Further, the electronic expansion valve further includes: a valve needle sleeve fixedly disposed on an upper portion of the valve needle body, the valve needle sleeve is provided with a first escape hole for avoiding the valve stem, an inner wall of the valve needle body, and a lower surface of the valve needle sleeve The upper surface of the valve seat core collectively encloses a receiving space.

Further, the electronic expansion valve further includes: a first silencing portion disposed in the accommodating space, the first silencing portion including the first silencing structure and the second silencing structure, the first silencing structure being located above the second silencing structure, the first silencing The structure blocks the first overcurrent channel, the second silencing structure blocks the second overcurrent channel, and the second end of the spring abuts on the valve seat core through the second muffling structure.

Further, the electronic expansion valve further includes a sealing portion disposed between the first silencing structure and the second silencing structure to partition the first silencing structure and the second silencing structure.

Further, the sealing portion is a sealing ring having a second relief hole for avoiding the valve stem, and the circumferential side wall of the sealing portion is in contact with the inner wall of the valve needle body.

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

Applying the technical solution of the present invention, the electronic expansion valve includes an elastic member disposed between the valve needle and the valve stem. When the valve stem moves downward relative to the valve needle, the elastic 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 resilient member applies an elastic force to the valve needle to abut the valve needle at the first valve port. Until the valve stem contacts the valve needle through the stop member, the valve needle moves up with the valve stem and the first valve port is opened. During the above-mentioned small flow adjustment, the direction of the elastic force applied by the elastic member to the valve needle is opposite to the direction of the pressure generated by the fluid, so that the pressure generated by the fluid can be counteracted, so that the valve needle can be blocked by its own gravity. At the mouth of a valve. Therefore, when the valve stem moves upward relative to the valve needle, and the fluid flows into the accommodating space from the first valve port, the valve needle does not leave the first valve port in advance, so that the flow rate adjustment is more precise, and the electronic expansion in the background art is solved. The problem of poor valve flow adjustment is poor.

DRAWINGS

The accompanying drawings, which are incorporated in the claims of the claims In the drawing:

1 is a partial longitudinal sectional structural view showing an electronic expansion valve in the background art;

2 is a longitudinal sectional structural view showing the valve needle of the first embodiment of the electronic expansion valve according to the present invention in an open position;

Figure 3 is a schematic enlarged plan view showing a portion A of the electronic expansion valve of Figure 2;

Figure 4 is a schematic longitudinal sectional view showing the valve needle of Figure 2 in a closed position;

Figure 5 is a schematic enlarged plan view showing a portion B of the electronic expansion valve of Figure 4;

Figure 6 is a longitudinal sectional view showing the cooperation of the valve needle and the valve stem when the valve needle of the electronic expansion valve of Figure 2 is in the open position;

Figure 7 is a longitudinal sectional view showing the cooperation of the valve needle and the valve stem when the valve needle of the electronic expansion valve of Figure 2 is in the closed position;

Figure 8 is a longitudinal sectional view showing the cooperation of the valve stem and the valve needle sleeve when the valve needle of the electronic expansion valve of Figure 2 is in the open position;

Figure 9 is a longitudinal sectional view showing the cooperation of the valve stem and the valve needle sleeve when the valve stem of the electronic expansion valve of Figure 2 is moved downward relative to the valve needle;

Figure 10 is a perspective view showing the structure of the spring of the electronic expansion valve of Figure 2;

Figure 11 is a perspective view showing the first gasket of the electronic expansion valve of Figure 2;

Figure 12 is a longitudinal sectional view showing the valve needle of the second embodiment of the electronic expansion valve according to the present invention in a closed position;

Figure 13 is a schematic enlarged plan view showing a portion C of the electronic expansion valve of Figure 12;

Figure 14 is a perspective view showing the structure of the disc spring of the electronic expansion valve of Figure 12;

Figure 15 is a perspective view showing the second gasket of the electronic expansion valve of Figure 12;

Figure 16 is a partial longitudinal sectional structural view showing a third embodiment of the electronic expansion valve according to the present invention;

Figure 17 is a schematic enlarged plan view showing a portion D of the electronic expansion valve of Figure 16;

Figure 18 is a longitudinal sectional structural view showing the valve stem of the fourth embodiment of the electronic expansion valve according to the present invention when the second valve port is evaded;

Figure 19 is a schematic enlarged plan view showing the portion E of the electronic expansion valve of Figure 18;

Figure 20 is a schematic longitudinal sectional view showing the valve stem of Figure 18 blocking the second valve port;

Figure 21 is a schematic enlarged plan view showing a portion F of the electronic expansion valve of Figure 20;

Figure 22 is a partial cross-sectional structural view showing the valve stem of the electronic expansion valve of Figure 18 in cooperation with the valve needle through the stop member;

Figure 23 is a partial cross-sectional structural view showing the valve stem of the electronic expansion valve of Figure 18 moved downward relative to the valve needle by S1;

Fig. 24 is a perspective view showing the structure of the elastic member of the electronic expansion valve of Fig. 18.

Wherein, the above figures include the following reference numerals:

10, valve body; 11, first valve port; 20, valve needle; 21, valve needle body; 211, first overcurrent channel; 22, valve seat core; 221, second valve port; 222, second over circulation 23; accommodating space; 30, valve stem; 31, valve stem body; 311, mounting groove; 32, stop structure; 931, step surface; 40, first silencing portion; 41, first silencing structure; a second sound absorbing structure; 60, a sealing portion; 70, a second sound absorbing portion; 80, a driving portion; 90, a stopper member; 100, an elastic member; 110, a first gasket; 111, a base portion; 112, a vertical portion 113, horizontal section; 120, bellows; 130, second washer; 131, mounting hole; 132, opening; 140, valve sleeve; 150, first pipe; 160, second pipe.

Detailed ways

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

As shown in FIGS. 2 to 7, the electronic expansion valve of the first embodiment includes a valve body 10, a valve needle 20, a valve stem 30, a driving portion 80, and an elastic member 100. The valve body 10 has a first valve port 11. The valve needle 20 has a closed position abutting the first valve port 11 and an open position avoiding the first valve port 11, and the bottom of the valve needle 20 has a second valve port 221 communicating with the first valve port 11, the valve needle 20 having The accommodating space 23 and the first over-current passage 211 and the second over-current passage 222 communicating with the accommodating space 23, the first over-current passage 211 is located on the side wall of the valve needle 20 and communicates with the outside, and the second over-current passage 222 is located The second valve port 221 is circumferentially outward and communicates with the second valve port 221. The valve stem 30 is at least partially disposed in the accommodating space 23, and the valve stem 30 is movable up and down to adjust the flow rate at the second valve port 221 . The driving portion 80 drives the valve stem 30 to move up and down, wherein a stopper member 90 is disposed between the valve stem 30 and the valve needle 20 to synchronously move the valve needle 20 and the valve stem 30 when they are in contact with the stopper member 90, and When the valve needle 20 is in the closed position, the valve stem 30 can move up and down relative to the valve needle 20. The resilient member 100 is disposed between the valve needle 20 and the valve stem 30. When the valve stem 30 moves downward relative to the valve needle 20, the resilient member 100 is compressed, when the valve stem 30 moves upward relative to the valve needle 20, and fluid is drawn from When the first valve port 11 flows into the accommodating space 23, the elastic member 100 applies an elastic force to the valve needle 20 to abut the valve needle 20 at the first valve port 11.

Applying the technical solution of the first embodiment, the electronic expansion valve includes the elastic member 100 disposed between the valve needle 20 and the valve stem 30. When the valve stem 30 moves downward relative to the valve needle 20, the resilient member 100 is 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 member 100 applies an elastic force to the valve needle 20 to abut the valve needle 20 at the first valve port 11. . Until the valve stem 30 comes into contact with the valve needle 20 through the stop member, the valve needle 20 moves upward together with the valve stem 30, and the first valve port 11 is opened. During the above-described small flow adjustment, the direction of the elastic force applied by the elastic member 100 to the valve needle 20 is opposite to the direction of the pressure generated by the fluid, so that the pressure generated by the fluid can be counteracted, so that the valve needle 20 can be sealed by its own gravity. Blocked at the first valve port 11. Therefore, when the valve stem 30 moves upward relative to the valve needle 20, and the fluid flows from the first valve port 11 into the accommodating space 23, the valve needle 20 does not leave the first valve port 11 in advance, so that the flow rate adjustment is more precise, and the solution is solved. The problem of poor flow adjustment effect of the electronic expansion valve in the background art is poor.

It should be noted that, in the first embodiment, the electronic expansion valve further includes a first duct 150 and a second duct 160. The first duct communicates with the accommodating space 23 through the first valve port 11, and the second duct 160 communicates with the accommodating space 23. .

The following describes the full open state, large flow regulation state, small flow regulation state, and fixed small flow state:

Full 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 a predetermined distance, at this time, the flow rate of the fluid flowing out from the electronic expansion valve is large, and the movement of the valve needle 20 The effect on the flow of the fluid is minimal. The above state is the fully open state. When the electronic expansion valve is in the fully open state, most of the fluid directly enters the valve body 10 and then flows out of the pipeline, and a small portion of the fluid enters the accommodating space 23 and then flows out of the pipeline.

Large flow regulation state: When the valve needle 20 opens the first valve port 11 and the distance from the first valve port 11 is less than a predetermined distance, the movement of the valve needle 20 has a large influence on the flow rate of the fluid. The above state is a large flow regulation state. When the electronic expansion valve is in a large flow regulation state, a portion of the fluid directly enters the valve body 10, then flows out of the pipeline, and another portion of the fluid enters the accommodating space 23 and then flows out of the pipeline.

Small flow adjustment state: when the valve needle 20 abuts at the first valve port 11 and the valve stem 30 does not abut the second valve port 221, the flow of fluid from the electronic expansion valve is small, and the movement of the valve stem 30 The fluid flow can be adjusted more accurately. The above state is a small flow regulation state. When the electronic expansion valve is in the small 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 another part of the fluid enters the accommodating space 23 through the second overflow passage 222 and then Flow out of the pipeline.

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

Below, a brief introduction to the working process of the electronic expansion valve:

(1) The fluid enters the accommodating space 23 from the first duct 150:

The electronic expansion valve changes from a fully open state to a fixed low flow state:

First, the driving portion 80 drives the valve stem 30 to move downward, and the valve needle 20 moves downward in synchronization with the valve stem 30 by the stopper member 90 under the action of gravity. When the valve needle 20 abuts on the first valve port 11, the valve stem 30 continues to move downward. At this time, the elastic member 100 is compressed, and the valve needle 20 is pressed against the first valve port by its gravity and elastic force. 11 places. When the valve stem 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 member 100 is in the maximum compression state, and the upward elastic force of the elastic member 100 is smaller than the resultant force of the driving portion 80, so that the valve stem 30 can be held at the abutting position (abutting at the position of the second valve port 221). When the electronic expansion valve is in a fixed small flow state, the fluid sequentially flows into the first valve port 11, the second overflow passage 222, the accommodating space 23, the first overcurrent passage 211, and finally flows out from the second conduit 160.

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

First, the driving portion 80 drives the valve stem 30 to move upward. 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 cancel the upward differential pressure generated by the fluid. . Therefore, before the stopper member 90 comes into contact with the valve needle 20, the valve needle 20 can be firmly pressed at the first valve port 11 to make the small flow rate adjustment of the electronic expansion valve more precise. When the stopper member 90 comes into contact with the valve needle 20, the valve needle 20 is hooked on the stopper member 90 by gravity, and the valve stem 30 drives the valve needle 20 to move upward together by the stopper member 90 until the valve needle 20 moves upward. Until the scheduled location.

(2) The fluid enters the accommodating space 23 from the second duct 160:

First, the driving portion 80 drives the valve stem 30 to move downward, and the valve needle 20 moves downward in synchronization with the valve stem 30 by the stopper member 90 under the action of gravity. When the valve needle 20 abuts on the first valve port 11, the valve stem 30 continues to move downward. At this time, the elastic member 100 is compressed, and the differential force generated by the fluid is offset by the elastic force of the elastic member 100, and the valve needle 20 is The gravity is applied to the first valve port 11 without additionally increasing the output force of the driving portion 80. When the valve stem 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 sequentially flows into the first overflow passage 211, the accommodating space 23, the second overflow passage 222, the first valve port 11, and finally flows out from the first conduit 150.

First, the driving portion 80 drives the valve stem 30 to move upward. Before the stopper member 90 comes into contact with the valve needle 20, the valve needle 20 is simultaneously pressed by the force of gravity, the elastic force of the elastic member 100, and the pressure difference generated by the fluid. A valve port 11 is located. Therefore, before the stopper member 90 comes into contact with the valve needle 20, the valve needle 20 can be firmly pressed at the first valve port 11 to make the small flow rate adjustment of the electronic expansion valve more precise. When the stopper member 90 comes into contact with the valve needle 20, the valve needle 20 is hooked on the stopper member 90 by gravity, and the valve stem 30 drives the valve needle 20 to move upward together by the stopper member 90 until the valve needle 20 moves upward. Until the scheduled location.

As shown in FIGS. 2 to 5 and 10, in the first embodiment, the elastic member 100 is a spring, the first end of the spring abuts against the valve stem 30, and the second end of the spring abuts against the top of the valve needle 20. The above structure is simple and easy to assemble.

As shown in FIG. 2 to FIG. 5 and FIG. 11 , in the first embodiment, the electronic expansion valve further includes: a first washer 110 sleeved on the valve stem 30 and synchronously moving with the valve stem 30 , the first end of the spring abuts It is attached to the lower surface of the first gasket 110. The above structure is simple, and provides a platform for the first end of the spring to abut, thereby ensuring the reliability and stability of the mechanism. Of course, those skilled in the art should know that it is also possible to provide a boss on the valve stem 30, and the first end of the spring directly abuts against the boss.

As shown in FIG. 2 to FIG. 5 and FIG. 11, in the first embodiment, the first gasket 110 includes a base section 111, a vertical section 112 which is disposed on opposite sides of the base section 111 and extends upward, and is disposed in the vertical section. A horizontal section 113 extending at the top and outwardly of the 112, the spring is sleeved outside the vertical section 112, and the first end of the spring abuts on the lower surface of the horizontal section 113. The vertical section 112 guides the spring so that the spring can expand and contract in a predetermined direction to ensure the reliability and stability of the mechanism.

As shown in FIG. 2 to FIG. 7, in the first embodiment, the valve stem 30 includes a valve stem body 31 and a stop structure 32 disposed on the sidewall of the valve stem body 31. The electronic expansion valve further includes a bellows 120 and a bellows. The first end of the 120 is fixed to the valve body 10. The second end of the bellows cooperates with the stop structure 32. The spring abuts the first washer 110 against the second end of the bellows 120 when the valve stem 30 moves downward. The stop structure 32 applies a downward force to the second end of the bellows 120, and the bellows 120 is stretched. When the valve stem 30 moves upward, the second end of the bellows 120 exerts an upward force on the valve stem 30. The arrangement of the bellows 120 enables the valve stem 30 to move up and down in a predetermined direction.

As shown in FIG. 2 to FIG. 5, in the first embodiment, the valve needle 20 includes a valve needle body 21 and a valve seat core 22 disposed in the valve needle body 21, and the second valve port 221 and the second flow passage 222 are both It is disposed on the valve seat core 22. The above structure is simple and easy to process.

As shown in FIG. 2 to FIG. 7 , in the first embodiment, the elastic member 100 is a spring, and the first end of the spring abuts the valve stem 30 , and the electronic expansion valve further includes: a valve sleeve 140 fixedly disposed on the valve needle body The upper portion of the valve sleeve 140 is provided with a relief hole for escaping the valve stem 30. The inner wall of the valve needle body 21 and the lower surface of the valve needle sleeve 140 together with the upper surface of the valve seat core 22 enclose a receiving space 23, which is spring-loaded. The second end abuts on the upper surface of the valve needle sleeve 140. The above structure is simple and easy to assemble. Specifically, at the time of assembly, the second end of the bellows 120 is first placed on the bottom of the stop structure 32, and then the first washer 110 is sleeved on the stem body 31. The spring is then placed over the vertical section 112 of the first washer 110 such that the first end of the spring abuts against the lower surface of the horizontal section 113. Next, the valve needle sleeve 140 is sleeved on the valve stem body 31. The valve needle sleeve 140 is moved upward so that the valve needle sleeve 140 avoids the mounting groove of the mounting stop member 90. The stop member 90 is then mounted in a mounting groove on the stem body 31 to release the valve sleeve 140. The needle sleeve 140 is stopped by the stop member 90 without coming out of the stem body 31. The assembled component is assembled with the valve needle 20. Preferably, in the first embodiment, the valve sleeve 40 is welded to the top of the valve needle 20 to complete the assembly of the valve stem 30 and the valve needle 20.

Since the independently arranged small flow unit is prone to abnormal noise, in order to solve the above problem. As shown in FIG. 3 and FIG. 5 to FIG. 7, in the first embodiment, the electronic expansion valve further includes a first silencing portion 40. The first silencing portion 40 is disposed in the accommodating space 23, and the first silencing portion 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, and the first silencing structure 41 is sealed. The first overcurrent channel 211 is blocked, and the second silencing structure 42 blocks the second overcurrent channel 222. Specifically, when the electronic expansion valve is in a fixed small flow state and fluid flows from the first conduit 150 into the first valve port 11, the fluid flowing into the first valve port 11 continues to flow into the second flow passage 222. The fluid flowing out of the second overflow passage 222 will enter the second silencing structure 42 for the first silence, and the fluid that has passed through the first silence will flow into the first silencing structure 41 for secondary silencing. Likewise, when the electronic expansion valve is in a fixed small flow state and fluid flows from the second conduit 160 into the valve body 10, the fluid flowing into the valve body 10 flows into the first overflow passage 211. The fluid flowing out of the first overflow passage 211 will enter the first silencing structure 41 for the first silence, and the fluid that has passed through the first silence will flow into the second silencing structure 42 for secondary silencing. The above structure enables the fluid flowing into the accommodating space 23 from both the forward and reverse directions to be silenced twice, thereby greatly reducing abnormal noise and improving the user experience.

As shown in FIG. 3 and FIG. 5 to FIG. 7, in the first embodiment, the electronic expansion valve further includes a second silencing portion 70. The second silencing portion 70 is disposed below the second valve port 221 and blocks the second valve port 221 and the second overcurrent passage 222. Specifically, when the electronic expansion valve is in a fixed small flow state and fluid flows from the first conduit 150 into the first valve port 11, the fluid flowing into the first valve port 11 will pass through the second muffler portion 70 for the first silence. The fluid that has been silenced for the first time will continue to flow into the second overcurrent passage 222. The fluid flowing out of the second overcurrent passage 222 will enter the second muffling structure 42 for the second muffling, and the second muffed fluid will flow into the first muffling structure 41 for three muffles. Likewise, when the electronic expansion valve is in a fixed small flow state and fluid flows from the second conduit 160 into the valve body 10, the fluid flowing into the valve body 10 flows into the first overflow passage 211. The fluid flowing out of the first overflow passage 211 will enter the first silencing structure 41 for the first silence, and the fluid that has passed through the first silence will flow into the second silencing structure 42 for secondary silencing. The fluid that has been silenced twice flows out of the second overflow passage 222. After the outflow, the fluid enters the second muffler 70 for the last mute. The above structure enables the fluid flowing into the accommodating space 23 from both the forward and reverse directions to be silenced three times, thereby greatly reducing abnormal noise and improving the user experience. Further, since the second silencing portion 70 is closed at the first valve port 11, when the electronic expansion valve is in the small flow rate adjustment state, the fluid entering the accommodating space 23 can also be silenced, thereby further improving the noise absorbing effect.

In the first embodiment, the first silencing structure 41 and the second silencing structure 42 are both mesh silencers. The above structure can greatly eliminate and disturb the vortex and air bubbles carried in the fluid, thereby better solving the problem of abnormal noise of the existing electronic expansion valve during initial small flow adjustment.

As shown in FIGS. 8 to 10, in the first embodiment, the amount of compression of the elastic member 100 is less than or equal to the stroke of the valve stem 30 with respect to the movement of the valve needle 20. In the present embodiment, the elastic member 100 is a spring. When the stop member 90 is installed, the valve needle sleeve 140 needs to be moved upward so that the valve needle sleeve 140 avoids the mounting groove of the mounting stop member 90. Since the upper surface of the valve sleeve 140 is engaged with the second end of the spring, when the valve needle sleeve 140 is moved upward, it is necessary to overcome the downward force applied by the spring. Since the elastic force F = kx, where x represents the amount of compression, the smaller the amount of compression, the smaller the elastic force that is overcome. Therefore, if the pre-compression of the spring is minimized, the smaller the spring force overcome during installation, the easier it is to install. Specifically, L in FIG. 8 is the distance between the lower surface of the horizontal section 113 and the upper surface of the valve needle sleeve 140. If the amount of pre-compression of the spring is to be as small as possible, the free length L3 of the spring needs to be less than or equal to L, that is, L3 ≤ L. Figure 9 shows a schematic view of the valve stem moving downward relative to the valve needle L1, at which point the distance between the lower surface of the horizontal section 113 and the upper surface of the valve needle sleeve 140 is L2. L2+L1=L, that is, L-L2=L1. Further, since L ≥ L3, L3 - L2 ≤ L1, that is, the amount of compression of the elastic member 100 is less than or equal to the stroke of the valve stem 30 with respect to the valve needle 20. In addition, the above structure also avoids 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 within the tolerance range of the elastic member can be maintained).

As shown in FIGS. 12 to 14, the electronic expansion valve of the second embodiment differs from the first embodiment in the specific structure of the elastic member 100. Specifically, in the second embodiment, the elastic member 100 is a disc spring, the disc spring is tapered, the disc spring is gradually contracted inward from the bottom to the top, and the upper end of the disc spring abuts against the valve stem 30, and the disc spring The lower end abuts the valve needle 20. The disc spring is rigid and can withstand large loads with small deformations.

As shown in FIGS. 13 and 15, in the second embodiment, the electronic expansion valve further includes a second gasket 130. The second washer 130 is sleeved on the valve stem 30 and moves synchronously with the valve stem 30, and the upper end of the disc spring abuts on the lower surface of the second washer 130. The above structure is simple, and provides a platform for the upper end of the disc spring to abut, thereby ensuring the reliability and stability of the mechanism.

As shown in FIG. 13 and FIG. 15, in the second embodiment, the valve stem 30 is provided with a mounting groove 311 on which the second washer 130 is mounted, and the disc spring abuts the second washer 130 against the groove wall of the mounting groove 311. on. The above structure is simple and easy to process and assemble.

As shown in FIG. 15 , in the second embodiment, the second gasket 130 is provided with a mounting hole 131 , the valve stem 30 is disposed in the mounting hole 131 , and the second gasket 130 is further provided with an opening 132 , the opening 132 and the mounting hole The 131 is communicated, the width H of the connection of the opening 132 and the mounting hole 131 is smaller than the diameter of the valve stem 30, and the width of the opening 132 gradually increases from the inside to the outside. Specifically, at the time of installation, the opening 132 is aligned with the mounting groove 311 of the valve stem 30, and the second washer 130 is pushed, so that the valve stem 30 is caught in the mounting hole 131, thereby completing the mounting. Since the width H of the joint of the opening 132 and the mounting hole 131 is smaller than the diameter of the valve stem 30, the valve stem 30 is not easily released from the mounting hole 131.

As shown in FIG. 16 and FIG. 17, the electronic expansion valve of the third embodiment differs from the first embodiment in the specific structure of the valve needle 20. Specifically, in the third embodiment, the valve needle body 21 and the valve seat core 22 are One piece structure. The above structure is simple, the assembly step is reduced, and the assembly efficiency is improved.

As shown in FIG. 18 to FIG. 24, the electronic expansion valve of the fourth embodiment is different from the first embodiment in the position of the elastic member 100. Specifically, the electronic expansion valve of the fourth embodiment includes: the valve body 10, the valve needle 20, The valve stem 30, the driving portion 80, and the elastic member 100. The valve body 10 has a first valve port 11. The valve needle 20 has a closed position abutting the first valve port 11 and an open position avoiding the first valve port 11, and the bottom of the valve needle 20 has a second valve port 221 communicating with the first valve port 11, the valve needle 20 having The accommodating space 23 and the first over-current passage 211 and the second over-current passage 222 communicating with the accommodating space 23, the first over-current passage 211 is located on the side wall of the valve needle 20 and communicates with the outside, and the second over-current passage 222 is located The second valve port 221 is circumferentially outward and communicates with the second valve port 221. At least a portion of the valve stem 30 is disposed within the accommodating space 23, and the valve stem 30 is movable up and down to adjust the flow rate at the second valve port 221 . The driving portion 80 drives the valve stem 30 to move up and down, wherein a stopper member 90 is disposed between the valve stem 30 and the valve needle 20 to synchronously move the valve needle 20 and the valve stem 30 when they are in contact with the stopper member 90, and When the valve needle 20 is in the closed position, the valve stem 30 can move up and down relative to the valve needle 20. The resilient member 100 is disposed within 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 resilient member 100 is compressed when the valve stem 30 is opposed to the valve When the needle 20 moves upward and fluid flows from the first valve port 11 into the accommodating space 23, the elastic member 100 applies an elastic force to the valve needle 20 to abut the valve needle 20 at the first valve port 11.

Applying the technical solution of the fourth embodiment, the electronic expansion valve includes the elastic member 100 disposed between the valve needle 20 and the valve stem 30. When the valve stem 30 moves downward relative to the valve needle 20, the resilient member 100 is 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 member 100 applies an elastic force to the valve needle 20 to abut the valve needle 20 at the first valve port 11. . Until the valve stem 30 comes into contact with the valve needle 20 through the stop member, the valve needle 20 moves upward together with the valve stem 30, and the first valve port 11 is opened. During the above-described small flow adjustment, the direction of the elastic force applied by the elastic member 100 to the valve needle 20 is opposite to the direction of the pressure generated by the fluid, so that the pressure generated by the fluid can be counteracted, so that the valve needle 20 can be sealed by its own gravity. Blocked at the first valve port 11. Therefore, when the valve stem 30 moves upward relative to the valve needle 20, and the fluid flows from the first valve port 11 into the accommodating space 23, the valve needle 20 does not leave the first valve port 11 in advance, so that the flow rate adjustment is more precise, and the solution is solved. The problem of poor flow adjustment effect of the electronic expansion valve in the background art is poor. Further, it is easier to assemble the elastic member 100 in the valve needle 20, thereby improving assembly efficiency.

It should be noted that, in the fourth embodiment, the electronic expansion valve further includes a first duct 150 and a second duct 160. The first duct communicates with the accommodating space 23 through the first valve port 11, and the second duct 160 communicates with the accommodating space 23. .

(1) The fluid enters the accommodating space 23 from the first duct 150:

(2) The fluid enters the accommodating space 23 from the second duct 160:

As shown in FIG. 18 to FIG. 21 and FIG. 24, in the fourth embodiment, the elastic member 100 is a spring, and the spring is sleeved on the valve stem 30. The valve stem 30 has a step surface 931, and the first end and the step surface of the spring The 931 abuts and the second end of the spring abuts on the valve needle 20. Preferably, in the fourth embodiment, the valve stem 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 the second column The diameter of the segment. A junction surface 931 is formed at the junction of the first column segment and the second column segment. The above structure is simple and easy to process and assemble. When assembling, it is only necessary to sleeve the spring on the second column section, and the first end of the spring is abutted against the step surface 931.

As shown in FIG. 19 and FIG. 21, in the fourth embodiment, the valve needle 20 includes a valve needle body 21 and a valve seat core 22 disposed in the valve needle body 21, and the second valve port 221 and the second flow passage 222 are both Disposed on the valve seat core 22, the second end of the spring abuts against the valve seat core 22. The above structure is simple and easy to process.

As shown in FIGS. 19 and 21, in the fourth embodiment, the electronic expansion valve further includes a valve needle sleeve 140. The valve needle sleeve 140 is fixedly disposed at an upper portion of the valve needle body 21, and the valve needle sleeve 140 is provided with a first escape hole for escaping the valve stem 30, the inner wall of the valve needle body 21, the lower surface of the valve needle sleeve 140 and the valve seat core 22 The upper surfaces collectively enclose a receiving space 23. The above structure is simple and easy to assemble.

Since the independently arranged small flow unit is prone to abnormal noise, in order to solve the above problem. As shown in FIGS. 19 and 21, in the fourth embodiment, the electronic expansion valve further includes a first silencing portion 40. The first silencing portion 40 is disposed in the accommodating space 23, and the first silencing portion 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, and the first silencing structure 41 is sealed. The first overcurrent channel 211 is blocked, and the second silencing structure 42 blocks the second overcurrent channel 222. Specifically, when the electronic expansion valve is in a fixed small flow state and fluid flows from the first conduit 150 into the first valve port 11, the fluid flowing into the first valve port 11 continues to flow into the second overflow passage 222. The fluid flowing out of the second overflow passage 222 will enter the second silencing structure 42 for the first silence, and the fluid that has passed through the first silence will flow into the first silencing structure 41 for secondary silencing. Likewise, when the electronic expansion valve is in a fixed small flow state and fluid flows from the second conduit 160 into the valve body 10, the fluid flowing into the valve body 10 flows into the first overflow passage 211. The fluid flowing out of the first overflow passage 211 will enter the first silencing structure 41 for the first silence, and the fluid that has passed through the first silence will flow into the second silencing structure 42 for secondary silencing. The above structure enables the fluid flowing into the accommodating space 23 from both the forward and reverse directions to be silenced twice, thereby greatly reducing abnormal noise and improving the user experience.

Further, in the fourth embodiment, the second end of the spring abuts against the valve seat core 22 through the second sound absorbing structure 42. Specifically, at the time of assembly, the bellows 120 and the needle sleeve 140 are sequentially sleeved on the valve stem 30, and then the stopper member 90 is mounted in the mounting groove on the valve stem 30. The stop member 90 is capable of stopping the valve sleeve 140 to prevent the needle sleeve 140 from coming out of the valve stem 30. The spring is then placed over the second column section to form a mounting assembly. Finally, the valve stem 30 is inserted into the valve needle 20, and when the valve stem 30 is moved downward to the predetermined position, the valve sleeve 140 is welded to the valve needle 20 to complete the assembly. At this time, the first end of the spring abuts on the step surface 931, and the second end of the spring abuts on the second silencing structure 42.

As shown in FIG. 19 and FIG. 21, in the fourth embodiment, the electronic expansion valve further includes: a sealing portion 60 disposed between the first silencing structure 41 and the second silencing structure 42 to partition the first silencing structure 41 and the second Silencing structure 42. Specifically, when the valve needle 20 is in the closed position and the valve stem 30 abuts at the second valve port 221, the electronic expansion valve is in a fixed small flow state. When the fluid enters from the first overflow passage 211, a part of the fluid flows into the accommodating space 23 after being silenced by the first silencing structure 41. The fluid flowing into the accommodating space 23 continues to flow to the second silencing structure 42. The other portion 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. Therefore, the above structure has the following two advantages: First, the arrangement of the sealing portion 60 enables the first silencing portion 40 to be repeatedly utilized, improving utilization, and improving the noise cancellation effect. Second, the arrangement of the sealing portion 60 is such that the effective distance of the fluid through the muffling is longer, effectively preventing the fluid from flowing directly from the gap between the first silencing structure 41 and the second silencing structure 42.

As shown in FIG. 19 and FIG. 21, in the fourth embodiment, the sealing portion 60 is a sealing ring having a second escape hole for escaping the valve stem 30, and the circumferential side wall of the sealing portion 60 and the valve needle body 21 The inner wall fits. The above structure is simple, easy to process and assemble. Moreover, 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 FIGS. 19 and 21, in the fourth embodiment, the electronic expansion valve further includes a second silencing portion 70. The second silencing portion 70 is disposed below the second valve port 221 and blocks the second valve port 221 and the second overcurrent passage 222. Specifically, when the electronic expansion valve is in a fixed small flow state and fluid flows from the first conduit 150 into the first valve port 11, the fluid flowing into the first valve port 11 will pass through the second muffler portion 70 for the first silence. The fluid that has been silenced for the first time will continue to flow into the second overcurrent passage 222. The fluid flowing out of the second overcurrent passage 222 will enter the second muffling structure 42 for the second muffling, and the second muffed fluid will flow into the first muffling structure 41 for three muffles. Likewise, when the electronic expansion valve is in a fixed small flow state and fluid flows from the second conduit 160 into the valve body 10, the fluid flowing into the valve body 10 flows into the first overflow passage 211. The fluid flowing out of the first overflow passage 211 will enter the first silencing structure 41 for the first silence, and the fluid that has passed through the first silence will flow into the second silencing structure 42 for secondary silencing. The fluid that has been silenced twice flows out of the second overflow passage 222. After the outflow, the fluid enters the second muffler 70 for the last mute. The above structure enables the fluid flowing into the accommodating space 23 from both the forward and reverse directions to be silenced three times, thereby greatly reducing abnormal noise and improving the user experience. Further, since the second silencing portion 70 is closed at the first valve port 11, when the electronic expansion valve is in the small flow rate adjustment state, the fluid entering the accommodating space 23 can also be silenced, thereby further improving the noise absorbing effect.

In the fourth embodiment, the first silencing structure 41 and the second silencing structure 42 and the second silencing portion 70 are both mesh-shaped silencers. The above structure can greatly eliminate and disturb the vortex and air bubbles carried in the fluid, thereby better solving the problem of abnormal noise of the existing electronic expansion valve during initial small flow adjustment.

As shown in FIGS. 22 to 24, in the fourth embodiment, the amount of compression of the elastic member 100 is less than or equal to the stroke of the valve stem 30 with respect to the valve needle 20. In the fourth embodiment, the elastic member 100 is a spring. When installing the stem in the spool, the valve stem needs to be moved down. Since the first end of the spring abuts against the step surface 931, when the valve stem 30 is moved downward, it is necessary to overcome the upward force exerted by the spring. Since the elastic force F = kx, where x represents the amount of compression, the smaller the amount of compression, the smaller the elastic force that is overcome. Therefore, if the pre-compression of the spring is minimized, the smaller the spring force overcome during installation, the easier it is to install. Specifically, S in FIG. 22 is the distance between the lower surface of the step surface 931 and the upper surface of the second silencing structure 42. If the amount of pre-compression of the spring is to be as small as possible, the free length S3 of the spring needs to be equal to or less than S. That is, S3 ≤ S. Fig. 23 shows a schematic view in which the valve stem is moved downward by S1 with respect to the valve needle, at which time the distance between the lower surface of the stepped surface 931 and the upper surface of the second silencing structure 42 is S2. S2+S1=S, ie S-S2=S1. Further, since S ≥ S3, S3-S2 ≤ S1, that is, the amount of compression of the elastic member 100 is less than or equal to the stroke of the valve stem 30 with respect to the valve needle 20. In addition, the above structure also avoids 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 within the tolerance range of the elastic member can be maintained).

The present application also provides a refrigeration system, an embodiment of the refrigeration system according to the present application comprising an electronic expansion valve. Among them, the electronic expansion valve is the above-described electronic expansion valve. Since the above electronic expansion valve has the advantage of precise adjustment of the flow rate, the refrigeration system having the same has its advantages.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

An electronic expansion valve characterized by comprising:

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

a valve needle (20) having a closed position abutting the first valve port (11) and an open position avoiding the first valve port (11), the bottom of the valve needle (20) having the same a second valve port (221) communicating with the first valve port (11), the valve needle (20) having a receiving space (23) and a first overcurrent passage (211) communicating with the receiving space (23) and a second overcurrent passage (222), the first overflow passage (211) is located on a side wall of the valve needle (20) and communicates with the outside, and the second overflow passage (222) is located at the first a circumferential direction outer side of the second valve port (221) and communicating with the second valve port (221);

a valve stem (30) is at least partially disposed in the accommodating space (23), and the valve stem (30) is movable up and down to adjust a flow rate at the second valve port (221);

a driving portion (80) driving the valve stem (30) to move up and down, wherein a stopper member (90) is disposed between the valve stem (30) and the valve needle (20) to make the valve The needle (20) moves synchronously with the valve stem (30) in contact with the stop member (90), and the valve stem (30) when the valve needle (20) is in the closed position Being movable up and down relative to the valve needle (20);

a resilient member (100) disposed between the valve needle (20) and the valve stem (30) or disposed within the valve needle (20) and abutting against the valve needle (20) Between the valve stems (30), when the valve stem (30) moves downward relative to the valve needle (20), the elastic element (100) is compressed when the valve stem (30) is opposite The elastic member (100) applies elasticity to the valve needle (20) as the valve needle (20) moves upward and fluid flows from the first valve port (11) into the accommodating space (23). a force to abut the valve needle (20) at the first valve port (11).
The electronic expansion valve according to claim 1, wherein said elastic member (100) is disposed between said valve needle (20) and said valve stem (30), said elastic member (100) being a spring, the first end of the spring abuts the valve stem (30), and the second end of the spring abuts the top of the valve needle (20).
The electronic expansion valve according to claim 2, wherein the electronic expansion valve further comprises:

a first washer (110) sleeved on the valve stem (30) and synchronously moving with the valve stem (30), the first end of the spring abutting under the first washer (110) On the surface.
The electronic expansion valve according to claim 3, wherein said first gasket (110) comprises a base section (111), a vertical section disposed on opposite sides of said base section (111) and extending upward (112) and a horizontal section (113) disposed at a top of the vertical section (112) and extending outwardly, the spring sleeved outside the vertical section (112), the first end of the spring abutting Attached to the lower surface of the horizontal section (113).
The electronic expansion valve according to claim 3, wherein the valve stem (30) includes a valve stem body (31) and a stop structure (32) disposed on a sidewall of the valve stem body (31) The electronic expansion valve further includes a bellows (120), the first end of the bellows (120) is fixed on the valve body (10), the second end of the bellows (120) is a stop structure (32) that engages the first washer (110) against the second end of the bellows (120) when the valve stem (30) moves downwardly The stop structure (32) applies a downward force to the second end of the bellows (120), the bellows (120) is stretched, and when the valve stem (30) moves upward, the ripple The second end of the tube (120) exerts an upward force on the valve stem (30).
The electronic expansion valve according to claim 1, wherein said elastic member (100) is disposed between said valve needle (20) and said valve stem (30), said valve needle (20) comprising a valve needle body (21) and a valve seat core (22) disposed in the valve needle body (21), the second valve port (221) and the second flow passage (222) are disposed at On the valve seat core (22).
The electronic expansion valve according to claim 6, wherein the elastic member (100) is a spring, the first end of the spring abuts the valve stem (30), and the electronic expansion valve further includes :

a valve needle sleeve (140) fixedly disposed at an upper portion of the valve needle body (21), the valve needle sleeve (140) is provided with a relief hole for avoiding the valve stem (30), the valve needle body ( The inner wall of 21), the lower surface of the valve needle sleeve (140) and the upper surface of the valve seat core (22) together define the receiving space (23), and the second end of the spring abuts On the upper surface of the valve sleeve (140).
The electronic expansion valve according to claim 6, wherein said valve needle body (21) and said valve seat core (22) are of unitary structure.
The electronic expansion valve according to claim 1, wherein the elastic member (100) is disposed between the valve needle (20) and the valve stem (30), the electronic expansion valve further comprising:

a first silencing portion (40) disposed in the accommodating space (23), the first silencing portion (40) including a first silencing structure (41) and a second silencing structure (42), the first silencing The structure (41) is located above the second silencing structure (42), the first silencing structure (41) blocks the first overcurrent channel (211), and the second silencing structure (42) is blocked The second overcurrent channel (222).
The electronic expansion valve according to claim 1, wherein the electronic expansion valve further comprises:

a second silencing portion (70), the second silencing portion (70) is disposed below the second valve port (221), and blocks the second valve port (221) and the second over-circulation Road (222).
The electronic expansion valve according to claim 1, wherein the amount of compression of the elastic member (100) is less than or equal to a stroke of movement of the valve stem (30) relative to the valve needle (20).
The electronic expansion valve according to claim 1, wherein said elastic member (100) is disposed between said valve needle (20) and said valve stem (30), said elastic member (100) being a disc spring, the disc spring is tapered, the disc spring is gradually inwardly contracted from bottom to top, and an upper end of the disc spring abuts against the valve stem (30), the disc spring The lower end abuts the valve needle (20).
The electronic expansion valve according to claim 12, wherein the elastic member (100) is disposed between the valve needle (20) and the valve stem (30), the electronic expansion valve further comprising:

a second washer (130) sleeved on the valve stem (30) and synchronously moving with the valve stem (30), the upper end of the disc spring abutting under the second washer (130) On the surface.
The electronic expansion valve according to claim 13, wherein said valve stem (30) is provided with a mounting groove (311) for mounting said second gasket (130), said disc spring The second gasket (130) abuts against the groove wall of the mounting groove (311).
The electronic expansion valve according to claim 13, wherein the second gasket (130) is provided with a mounting hole (131), and the valve stem (30) is disposed in the mounting hole (131). The second gasket (130) is further provided with an opening (132), the opening (132) is in communication with the mounting hole (131), and the opening (132) is connected to the mounting hole (131) The width H is smaller than the diameter of the valve stem (30), and the width of the opening (132) gradually increases from the inside to the outside.
The electronic expansion valve according to claim 1, wherein said elastic member (100) is disposed in said valve needle (20) and abuts against said valve needle (20) and said valve stem (30) Between the two, the elastic element (100) is a spring, the spring is sleeved on the valve stem (30), the valve stem (30) has a step surface (931), the first of the spring The end abuts the step surface (931), and the second end of the spring abuts on the valve needle (20).
The electronic expansion valve according to claim 16, wherein said valve needle (20) comprises a valve needle body (21) and a valve seat core (22) disposed in said valve needle body (21), The second valve port (221) and the second flow passage (222) are both disposed on the valve seat core (22), and the second end of the spring abuts against the valve seat core (22) on.
The electronic expansion valve according to claim 17, wherein said electronic expansion valve further comprises:

a valve needle sleeve (140) fixedly disposed at an upper portion of the valve needle body (21), the valve needle sleeve (140) is provided with a first escape hole for avoiding the valve stem (30), the valve needle The inner wall of the body (21), the lower surface of the valve needle sleeve (140) and the upper surface of the valve seat core (22) together define the accommodation space (23).
The electronic expansion valve according to claim 17, wherein said electronic expansion valve further comprises:

a first silencing portion (40) disposed in the accommodating space (23), the first silencing portion (40) including a first silencing structure (41) and a second silencing structure (42), the first silencing The structure (41) is located above the second silencing structure (42), the first silencing structure (41) blocks the first overcurrent channel (211), and the second silencing structure (42) is blocked The second overcurrent channel (222), the second end of the spring abuts on the valve seat core (22) through the second silencing structure (42).
The electronic expansion valve according to claim 19, wherein said electronic expansion valve further comprises:

a sealing portion (60) disposed between the first silencing structure (41) and the second silencing structure (42) to separate the first silencing structure (41) from the second silencing structure (42) .
The electronic expansion valve according to claim 20, wherein said sealing portion (60) is a seal ring having a second escape hole for escaping said valve stem (30), said seal portion The circumferential side wall of (60) is fitted to the inner wall of the valve needle body (21).
A refrigeration system comprising: an electronic expansion valve, wherein the electronic expansion valve is the electronic expansion valve according to any one of claims 1 to 21.