Electronic expansion valve and refrigerating system

Abstract

The electronic expansion valve comprises a valve element assembly and a valve seat assembly, the valve seat assembly is provided with a valve port part, and the valve element assembly can move in the direction close to or away from the valve port part. The valve element assembly comprises a first valve needle and a second valve needle, the second valve needle is provided with an adjusting channel capable of being communicated with the valve port part, and the first valve needle can be movably matched with the adjusting channel so as to control the liquid inlet amount of the adjusting channel. A flow guide protrusion protruding out of the end face of the second valve needle in the preset axial direction is arranged at the end, close to the valve port part, of the adjusting channel and provided with a flow guide channel communicating with the adjusting channel and the valve port part. According to the electronic expansion valve and the refrigerating system, the problem that the balance hole is easily blocked by oil in fluid is solved.

Description

Technical Field

[0001] The present application relates to the field of valve body technology, and in particular to an electronic expansion valve and a refrigeration system. Background Art

[0002] The electronic expansion valve includes a large valve needle and a small valve needle. The large valve needle closes the large valve port, and the small valve needle closes the small valve port. Usually, in order to reduce the driving force required for the switch valve, the large valve needle is provided with a balancing channel. The fluid at the upper end of the large valve needle is connected to the large valve port through the balancing channel to ensure that the combined force of the fluid on the large valve needle is zero. The large valve needle is provided with an adjustment channel, and the small valve port is located in the adjustment channel. The adjustment channel is close to the balancing channel of the large valve needle, and the fluid throttled out of the adjustment channel is gas-liquid two-phase, and the fluid contains oil. In this way, the gas-liquid two-phase fluid is easy to flow back to the balancing channel due to turbulence, and the oil in the fluid blocks the balancing channel. Utility Model Content

[0003] Based on this, it is necessary to provide an electronic expansion valve and a refrigeration system to solve the problem that the oil in the fluid is easy to block the balance hole.

[0004] The electronic expansion valve provided in the present application includes a valve core assembly and a valve seat assembly, wherein the valve seat assembly is provided with a valve port portion, and the valve core assembly can move in a direction close to or away from the valve port portion. The valve core assembly includes a first valve needle and a second valve needle, wherein the second valve needle is provided with an adjustment channel that can be connected to the valve port portion, and the first valve needle can be movably coordinated with the adjustment channel to control the amount of liquid entering the adjustment channel. An end of the adjustment channel close to the valve port portion is provided with a flow guide protrusion protruding from the end face of the second valve needle along a preset axial direction, and the flow guide protrusion is provided with a flow guide channel connecting the adjustment channel and the valve port portion.

[0005] In one embodiment, the valve core assembly further includes a fixing ring, one end of which is connected to one end of the regulating channel close to the valve port, and the other end of the fixing ring protrudes from the end surface of the second valve needle along a preset axial direction to form a guide protrusion.

[0006] In one embodiment, the valve core assembly also includes a sealing ring, the inner wall of the second valve needle is provided with a limit step, the sealing ring is stopped at the limit step and the fixing ring at both ends along the preset axial direction, and the end of the first valve needle close to the valve mouth can be sealed with the sealing ring.

[0007] In one embodiment, the sealing ring is made of rubber, silicone or soft plastic.

[0008] In one embodiment, the fixing ring is welded to the inner wall of the adjusting channel.

[0009] In one embodiment, the fixing ring is cylindrical.

[0010] In one embodiment, the flow area of ​​the flow guide channel tends to increase along the direction from the regulating channel to the valve port.

[0011] In one embodiment, the flow guiding channel is in a conical expansion shape.

[0012] In one embodiment, the second valve needle is provided with a balancing hole, the balancing hole and the guide protrusion are staggered along a preset axial direction, and the balancing hole and the guide protrusion are staggered along a radial direction of the electronic expansion valve.

[0013] The present application also provides a refrigeration system, which includes the electronic expansion valve described in any one of the above embodiments.

[0014] Compared with the prior art, the electronic expansion valve and refrigeration system provided in the present application increase the distance between the opening of the guide channel and the balancing hole on the second valve needle (used to balance the pressure on both sides of the valve core assembly) by setting a guide protrusion and a guide channel. When the gas-liquid two-phase fluid (containing oil) flowing out of the regulating channel flows out of the guide channel, the fluid is not easy to converge into the balancing hole, so as to avoid the balancing hole being blocked by the oil in the fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 A schematic diagram of the structure of an electronic expansion valve according to an embodiment of the present application;

[0017] Figure 2 A cross-sectional view of an electronic expansion valve according to an embodiment of the present application;

[0018] Figure 3 for Figure 2 An enlarged view of point A is shown;

[0019] Figure 4 A schematic structural diagram of a rotor assembly and a guide rod according to an embodiment of the present application.

[0020] : Illustration numerals: 100, housing; 200, rotor assembly; 300, screw rod; 400, valve core assembly; 410, sliding nut; 420, first valve needle; 430, second valve needle; 431, adjusting channel; 432, guide protrusion; 433, guide channel; 434, fixing ring; 435, sealing ring; 436, limiting step; 437, balancing hole; 500, valve seat assembly; 510, valve mouth; 600, stop ring; 700, guide rod; 800, stop seat; 810, outer guide rail; 910, first elastic member; 920, second elastic member. DETAILED DESCRIPTION

[0021] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0023] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0025] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0027] See also Figure 1-Figure 4 The present application provides an electronic expansion valve, which includes a housing 100, a stator assembly, a rotor assembly 200, a screw rod 300, a valve core assembly 400 and a valve seat assembly 500. The housing 100 is covered on the outside of the rotor assembly 200, part of the screw rod 300 and part of the valve core assembly 400 and welded to the valve seat assembly 500. The stator assembly is sleeved on the outside of the housing 100, and the stator assembly can drive the rotor assembly 200 to rotate. The valve seat assembly 500 is provided with a valve mouth 510, and the valve core assembly 400 can move relative to the valve seat assembly 500 along the axial direction of the screw rod 300, one end of the screw rod 300 is fixedly connected to the rotor assembly 200, and the other end is threadedly connected to the valve core assembly 400, and the rotor assembly 200 can drive the valve core assembly 400 to move in a direction close to or away from the valve mouth 510 through the screw rod 300.

[0028] The electronic expansion valve further includes a stop ring 600, a guide rod 700 and a stop seat 800, wherein the stop seat 800 is sleeved outside the screw rod 300 and fixedly connected to the valve seat assembly 500. The stop seat 800 is also provided with an outer guide rail portion 810 (an outer threaded guide rail in this embodiment) on the outer peripheral side away from the screw rod 300, the stop ring 600 is sleeved on the outer periphery of the stop seat 800 and movably cooperates with the outer guide rail portion 810, the guide rod 700 is fixedly connected to the rotor assembly 200 or the screw rod 300, and the rotor assembly 200 can drive the guide rod 700 to push the stop ring 600 to spirally move along the outer guide rail portion 810.

[0029] The valve core assembly 400 includes a sliding nut 410, a first valve needle 420 and a second valve needle 430. The end of the screw rod 300 away from the rotor assembly 200 is threadedly matched with the sliding nut 410. The screw rod 300 can drive the sliding nut 410 to drive the second valve needle 430 to open or close the valve port 510 through the first valve needle 420. The second valve needle 430 is provided with an adjustment channel 431 that can be connected to the valve port 510. The flow area of ​​the adjustment channel 431 is smaller than the flow area of ​​the valve port 510. The screw rod 300 can drive the sliding nut 410 to drive the first valve needle 420 to flexibly cooperate with the adjustment channel 431 to control the amount of liquid entering the adjustment channel 431.

[0030] In this way, the screw rod 300 can be rotated along the preset direction first to drive the sliding nut 410 to drive the first valve needle 420 and the second valve needle 430 to close the valve mouth 510. Then, the screw rod 300 can be rotated in the direction opposite to the preset direction to drive the sliding nut 410 to drive the first valve needle 420 to move away from the regulating channel 431, thereby achieving fine-tuning of the liquid inlet amount at the regulating channel 431.

[0031] In one embodiment, the electronic expansion valve further comprises a first elastic member 910, one end of the first elastic member 910 is connected to the screw rod 300, and the other end is connected to the stop seat 800 or the valve seat assembly 500, wherein the connection here comprises abutment. The first elastic member 910 is a compression elastic member, so that the screw rod 300 and the stop seat 800 (or the valve seat assembly 500) can be movably matched along the axial direction of the screw rod 300 through the first elastic member 910.

[0032] When the valve core assembly 400 moves to the position of closing the valve mouth portion 510 and the rotor assembly 200 continues to rotate, the first valve needle 420 and the second valve needle 430 can no longer move toward the valve mouth portion 510. Since the screw rod 300 and the valve seat assembly 500 can cooperate along the axial direction of the screw rod 300 through the first elastic member 910, the screw rod 300 and the rotor assembly 200 move in a direction away from the valve mouth portion 510, and the first elastic member 910 is squeezed during the movement of the screw rod 300. Under the push of the reaction force, the first elastic member 910 generates an elastic force on the screw rod 300. The elastic force can drive the screw rod 300 to drive the valve core assembly 400 to further squeeze the valve mouth portion 510, so as to generate a pre-tightening force on the valve mouth portion 510, thereby improving the sealing between the valve mouth portion 510 and the second valve needle 430.

[0033] Specifically, in one embodiment, the first elastic member 910 is a compression spring or a metal spring.

[0034] In one embodiment, the electronic expansion valve also includes a second elastic member 920, one end of the second elastic member 920 abuts against the second valve needle 430, and the other end abuts against the valve seat assembly 500, and the second elastic member 920 is a compression elastic member so that the second valve needle 430 has a tendency to move toward the direction close to the valve mouth portion 510.

[0035] In this way, the second valve needle 430 is always driven by the second elastic member 920 , which can prevent the second valve needle 430 from shaking left and right, thereby facilitating the alignment of the first valve needle 420 and the regulating channel 431 .

[0036] Specifically, in one embodiment, the second elastic member 920 is a compression spring, and the second elastic member 920 is sleeved on the outside of a portion of the second valve needle 430 and a portion of the sliding nut 410. At least a portion of the second elastic member 920 is located inside the first valve needle 420. When the second valve needle 430 closes the valve port 510, the second elastic member 920 provides a pre-tightening force to ensure the sealing of the valve port 510 when it is in a closed state.

[0037] In this way, it is helpful to control the driving force of the second elastic member 920 on the second valve needle 430 .

[0038] In one embodiment, if Figure 2 and Figure 3 As shown, one end of the regulating channel 431 close to the valve mouth 510 is provided with a guide protrusion 432 protruding from the end surface of the second valve needle 430 along a preset axial direction, and the guide protrusion 432 is provided with a guide channel 433 connecting the regulating channel 431 and the valve mouth 510.

[0039] It should be noted that the preset axial direction, the axial direction of the screw rod 300, the axial direction of the stop seat 800, the axial direction of the valve core assembly 400, the axial direction of the rotor assembly 200 and the axial direction of the electronic expansion valve are all in the same direction, that is, in the electronic expansion valve, the components such as the screw rod 300, the stop seat 800 and the valve core assembly 400 are all coaxially arranged.

[0040] The second valve needle 430 is provided with a balancing hole 437, and the balancing hole 437 and the flow guiding protrusion 432 are arranged in a preset axial offset, and the balancing hole 437 and the flow guiding protrusion 432 are arranged in a radial offset along the electronic expansion valve. By providing the flow guiding protrusion 432 and the flow guiding channel 433, the distance between the opening of the flow guiding channel 433 and the balancing hole 437 on the second valve needle 430 (used to balance the pressure on both sides of the valve core assembly 400) is increased, and when the gas-liquid two-phase fluid (containing oil) flowing out of the regulating channel 431 flows out of the flow guiding channel 433, the fluid is not easy to converge to the balancing hole 437, so as to avoid the balancing hole 437 being blocked by the oil in the fluid.

[0041] Specifically, in one embodiment, the length of the guide protrusion 432 protruding from the end surface of the second valve needle 430 is greater than or equal to 1 mm.

[0042] In one embodiment, if Figure 2 and Figure 3 As shown, along the direction from the regulating channel 431 to the valve mouth 510, the flow area of ​​the guide channel 433 tends to increase. Specifically, the guide channel 433 is in a conical expansion shape, which is beneficial to reducing the flow rate of the fluid at the outlet of the guide channel 433, thereby reducing the noise in the electronic expansion valve.

[0043] Further, in one embodiment, if Figure 2 and Figure 3 As shown, the valve core assembly 400 also includes a cylindrical fixing ring 434, one end of which is connected to one end of the regulating channel 431 close to the valve port 510, and the other end protrudes from the end surface of the second valve needle 430 along a preset axial direction to form a guide protrusion 432.

[0044] Specifically, the fixing ring 434 is welded to the inner wall of the second valve needle 430 .

[0045] In this way, the processing difficulty of the guide protrusion 432 is reduced, and the provision of the guide protrusion 432 is helpful to reduce the welding difficulty of the second valve needle 430 and the fixing ring 434 .

[0046] Furthermore, in one embodiment, if Figure 2 and Figure 3As shown, the valve core assembly 400 also includes a sealing ring 435, and the inner wall of the second valve needle 430 is provided with a limiting step 436. The sealing ring 435 is stopped at the limiting step 436 and the fixing ring 434 at both ends along the preset axial direction, and the end of the first valve needle 420 close to the valve mouth 510 can be sealed and matched with the sealing ring 435.

[0047] Specifically, the sealing ring 435 may be made of rubber, silicone or other soft plastic materials. The sealing ring 435 is provided to improve the sealing performance of the second valve needle 430 and the first valve needle 420 .

[0048] The present application also provides a refrigeration system, which includes the electronic expansion valve described in any one of the above embodiments.

[0049] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. An electronic expansion valve, It is characterized in that The invention comprises a valve core assembly (400) and a valve seat assembly (500), wherein the valve seat assembly (500) is provided with a valve opening (510), and the valve core assembly (400) is capable of moving in a direction close to or away from the valve opening (510); the valve core assembly (400) comprises a first valve needle (420) and a second valve needle (430), wherein the second valve needle (430) is provided with an adjusting channel (431) capable of communicating with the valve opening (510), and the first valve needle (420) is capable of movably cooperating with the adjusting channel (431) to control the amount of liquid inlet into the adjusting channel (431); One end of the regulating channel (431) close to the valve mouth (510) is provided with a guide protrusion (432) protruding from the end face of the second valve needle (430) along a preset axial direction, and the guide protrusion (432) is provided with a guide channel (433) connecting the regulating channel (431) and the valve mouth (510).

2. The electronic expansion valve according to claim 1, It is characterized in that The valve core assembly (400) also includes a fixing ring (434), one end of which is connected to one end of the regulating channel (431) close to the valve mouth (510), and the other end protrudes from the end surface of the second valve needle (430) along the preset axial direction to form the guide protrusion (432).

3. The electronic expansion valve according to claim 2, It is characterized in that The valve core assembly (400) also includes a sealing ring (435), and the inner wall of the second valve needle (430) is provided with a limiting step (436). The sealing ring (435) is stopped at the limiting step (436) and the fixing ring (434) at both ends along a preset axial direction, and the end of the first valve needle (420) close to the valve mouth (510) can be sealed and matched with the sealing ring (435).

4. The electronic expansion valve according to claim 3, It is characterized in that The sealing ring (435) is made of rubber, silicone or soft plastic.

5. The electronic expansion valve according to claim 2, It is characterized in that The fixing ring (434) is welded to the inner wall of the regulating channel (431).

6. The electronic expansion valve according to claim 2, It is characterized in that The fixing ring (434) is cylindrical.

7. The electronic expansion valve according to claim 1, It is characterized in that Along the direction from the regulating channel (431) to the valve mouth portion (510), the flow area of ​​the guide channel (433) tends to increase.

8. The electronic expansion valve according to claim 7, It is characterized in that The guide channel (433) is in a conical expansion shape.

9. The electronic expansion valve according to claim 1, It is characterized in that The second valve needle (430) is provided with a balancing hole (437), and the balancing hole (437) and the flow guide protrusion (432) are arranged in a preset axial offset manner, and the balancing hole (437) and the flow guide protrusion (432) are arranged in a radial offset manner of the electronic expansion valve.

10. A refrigeration system, It is characterized in that It comprises the electronic expansion valve as described in any one of claims 1 to 9.

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