Electronic expansion valve and refrigeration equipment

Abstract

The electronic expansion valve comprises a valve body, a valve seat, a driving assembly, a nut and a valve needle, the valve seat is installed on the valve body, a valve cavity is defined by the valve seat and the valve body, an installation groove and a valve port are formed in the valve seat, the driving assembly is installed on the valve body and located in the valve cavity, and the nut is arranged in the valve cavity. The nut is mounted in the mounting groove, a first vent hole is formed in the nut, and the valve needle comprises a guide section and a plugging section which are sequentially arranged; the guide section is provided with a second vent hole, a vent channel is arranged in the valve needle, the plugging section is provided with a third vent hole, and the valve cavity is communicated with the third vent hole through the first vent hole, the second vent hole and the vent channel in sequence; when the valve needle blocks the valve port, at least part of the second vent hole is located in the side, away from the valve port, of the bottom of the mounting groove. According to the technical scheme provided by the utility model, scrap iron in the electronic expansion valve is prevented from entering an air conditioning system, and the stability of refrigeration equipment is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration equipment, in particular to an electronic expansion valve and refrigeration equipment. Background Art

[0002] In the prior art, the internal vent groove of the electronic expansion valve is set in the inner hole of the connecting seat. The inner hole processing is relatively complex and difficult, and the labor and manufacturing costs are high. The inner hole of the connecting seat and the outer circle of the largest section of the valve needle are matched with a small gap, and the linear seal between the valve needle and the valve port is ensured by the guide. Then, the setting of the vent hole in the inner hole of the connecting seat, after the vent hole of the processed connecting seat is broken, the burrs are not cleanly removed. This causes the valve needle to deviate during the opening and closing process in the guide hole of the connecting seat, which in turn causes unilateral contact between the valve needle and the valve port, reducing the sealing performance and exceeding the internal leakage standard, affecting the energy efficiency of the system. More seriously, during operation, as the operating time increases, the iron filings generated by the friction burrs may flow into the valve or even enter the air conditioning system, causing the valve to become stuck at the least and the system to fail in the worst case. Utility Model Content

[0003] The main purpose of the utility model is to provide an electronic expansion valve and a refrigeration device, aiming to reduce the entry of iron filings in the electronic expansion valve into the air-conditioning system and improve the stability of the refrigeration device.

[0004] To achieve the above-mentioned purpose, the electronic expansion valve proposed in the present invention comprises:

[0005] Valve body;

[0006] A valve seat, the valve seat being mounted on the valve body, the valve seat and the valve body enclosing a valve cavity, the valve seat being provided with a mounting groove and a valve port;

[0007] a drive assembly, the drive assembly being mounted on the valve body and located in the valve cavity;

[0008] a nut, the nut being mounted in the mounting slot and having a first vent hole formed therein; and

[0009] a valve needle, the valve needle comprising a guide section and a blocking section arranged in sequence, the guide section being in transmission connection with the drive assembly to drive the valve needle to move in the axial direction so that the blocking section opens or blocks the valve port; the guide section being provided with a second vent hole, the valve needle being provided with a ventilation channel, the blocking section being provided with a third vent hole, the valve cavity being connected to the third vent hole via the first vent hole, the second vent hole, and the ventilation channel in sequence;

[0010] Wherein, when the valve needle is blocked at the valve port, the second vent hole is at least partially located at a side of the bottom of the mounting groove away from the valve port.

[0011] In one embodiment, the shortest distance between two straight line segments of the second ventilation hole is R1, and R1 ≥ 1.2 mm.

[0012] In one embodiment, a first guiding through hole is provided on the valve seat, and the mounting groove, the first guiding through hole, and the valve port are sequentially arranged on the valve seat, and the guiding section is slidably connected in the first guiding through hole.

[0013] In one embodiment, the diameter of the first guiding through hole is R2, and the maximum outer diameter of the guiding section is R3, and 0.05 mm ≤ (R2 - R3) / 2 ≤ 0.1 mm.

[0014] In one embodiment, a second guiding through hole is provided at one end of the nut facing the valve needle, the valve cavity and the second guiding through hole are communicated through the first ventilation hole, at least a part of the guiding section is located in the second guiding through hole, and the guiding section and the second guiding through hole are in clearance fit.

[0015] In one embodiment, the maximum outer diameter of the valve needle is R3, and the diameter of the second guiding through hole is R4, and 0.3 mm ≤ (R4 - R3) / 2 ≤ 0.5 mm.

[0016] In one embodiment, the second ventilation hole is arranged in a U shape.

[0017] In one embodiment, the second ventilation hole extends to the end surface of the valve needle at one end facing the nut.

[0018] In one embodiment, a plurality of the first ventilation holes and / or the second ventilation holes are provided.

[0019] The present utility model also provides a refrigeration device, including the electronic expansion valve as described above.

[0020] The valve cavity in the technical solution of the present invention is connected to the third vent hole in sequence through the first vent hole, the second vent hole and the vent channel; wherein, when the valve needle is blocked at the valve port, the second vent hole is at least partially located at the bottom of the mounting groove on the side away from the valve port. Compared with the prior art, a vent groove is also required to be provided on the valve seat, so that the valve needle brings the burrs on the vent groove of the valve seat into the refrigerant system when it moves up and down in the valve seat. In the technical solution of the present invention, when the valve needle is blocked at the valve port, the valve cavity is connected to the third vent hole in sequence through the first vent hole, the second vent hole and the vent channel, and the second vent hole is at least partially located at the bottom of the mounting groove on the side away from the valve port, that is, the second vent hole is located above the bottom wall of the mounting groove, so that there is no need to provide a vent groove on the valve seat, thereby reducing the iron filings in the electronic expansion valve from entering the air-conditioning system, improving the stability of the refrigeration equipment; and also reducing the production and manufacturing cost of the valve seat. Furthermore, the valve cavity is connected to the third vent hole through the first vent hole, the second vent hole and the vent channel in sequence, so that the pressure of the inner and outer cavities at the valve port is balanced, thereby facilitating the valve needle to switch from the valve port blocking state to the valve port opening state, thereby improving the stability and reliability of the electronic expansion valve operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0022] Figure 1 This is a structural diagram of an embodiment of an electronic expansion valve provided by the utility model;

[0023] Figure 2 for Figure 1 Schematic diagram of the structure of the middle valve needle;

[0024] Figure 3 for Figure 2 a cross-sectional view from one perspective;

[0025] Figure 4 for Figure 2 A cross-sectional view from another perspective;

[0026] Figure 5 for Figure 1 A structural diagram of the middle connecting seat from one perspective;

[0027] Figure 6 for Figure 1 A structural diagram of the middle connecting seat from another perspective;

[0028] Figure 7 forFigure 1 Cross-sectional view of the middle connecting seat;

[0029] Figure 8 is Figure 1 Schematic structural diagram of the middle connecting seat from another perspective;

[0030] Figure 9 is Figure 1 Schematic structural diagram of the valve port seat in the middle;

[0031] Figure 10 is Figure 9 Cross-sectional view of;

[0032] Figure 11 is Figure 1 Schematic structural diagram of the nut in the middle;

[0033] Figure 12 is Figure 11 Bottom view of;

[0034] Figure 13 is Figure 11 Cross-sectional view from one perspective;

[0035] Figure 14 is Figure 11 Cross-sectional view from another perspective.

[0036] Explanation of the reference numerals in the attached drawings:

[0037] 10. Valve body; 11. Valve cavity; 20. Valve seat; 21. Connecting seat; 211. Installation groove; 212. First guiding through hole; 22. Valve port seat; 221. Valve port; 31. Coil; 32. Rotor; 33. Lead screw; 34. Predetermined spring; 35. Bearing; 36. Bushing; 40. Nut; 41. First ventilation hole; 42. Second guiding through hole; 50. Valve needle; 51. Guiding section; 511. Second ventilation hole; 52. Blocking section; 521. Third ventilation hole; 53. Ventilation passage.

[0038] The realization, functional features and advantages of the purpose of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0039] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0040] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, then such directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture. If this specific posture changes, then the directional indications will also change accordingly.

[0041] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, then such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0042] Referring to Figures 1 to 7 , the present utility model provides an electronic expansion valve, comprising:

[0043] A valve body 10;

[0044] A valve seat 20, the valve seat 20 is installed on the valve body 10, and a valve cavity 11 is formed by enclosing the valve seat 20 and the valve body 10. An installation groove 211 and a valve port 221 are provided on the valve seat 20;

[0045] A driving assembly, the driving assembly is installed on the valve body 10 and is located within the valve cavity 11;

[0046] A nut 40, the nut 40 is installed in the installation groove 211, and a first ventilation hole 41 is provided on the nut 40; and

[0047] A valve needle 50, the valve needle 50 includes a guiding section 51 and a plugging section 52 arranged in sequence. The guiding section 51 is in transmission connection with the driving assembly to drive the valve needle 50 to move in the axial direction, so that the plugging section 52 opens or plugs the valve port 221; a second ventilation hole 511 is provided on the guiding section 51, a ventilation channel 53 is provided inside the valve needle 50, a third ventilation hole 521 is provided on the plugging section 52, and the valve cavity 11 is sequentially connected to the third ventilation hole 521 through the first ventilation hole 41, the second ventilation hole 511, and the ventilation channel 53;

[0048] Wherein, when the valve needle 50 blocks the valve port 221, at least a part of the second ventilation hole 511 is located on a side of the bottom of the installation groove 211 away from the valve port 221.

[0049] In the technical solution of the present utility model, the valve cavity 11 is sequentially communicated with the third ventilation hole 521 through the first ventilation hole 41, the second ventilation hole 511 and the ventilation channel 53; wherein, when the valve needle 50 blocks the valve port 221, at least a part of the second ventilation hole 511 is located on a side of the bottom of the installation groove 211 away from the valve port 221. Compared with the prior art, it is also necessary to provide a ventilation groove on the valve seat 20, so that when the valve needle 50 moves up and down in the valve seat 20, burrs on the ventilation groove of the valve seat 20 are brought into the refrigerant system. In the technical solution of the present utility model, when the valve needle 50 blocks the valve port 221, the valve cavity 11 is sequentially communicated with the third ventilation hole 521 through the first ventilation hole 41, the second ventilation hole 511 and the ventilation channel 53, and at least a part of the second ventilation hole 511 is located on a side of the bottom of the installation groove 211 away from the valve port 221, that is, the second ventilation hole 511 is located above the bottom wall of the installation groove 211, so that there is no need to provide a ventilation groove on the valve seat 20, thereby reducing the iron filings in the electronic expansion valve from entering the air-conditioning system and improving the stability of the refrigeration equipment. Further, the valve cavity 11 is sequentially communicated with the third ventilation hole 521 through the first ventilation hole 41, the second ventilation hole 511 and the ventilation channel 53, so that the pressure inside and outside the valve port 221 is balanced, which is convenient for the valve needle 50 to switch from the state of blocking the valve port 221 to the state of opening the valve port 221, thereby improving the stability and reliability of the operation of the electronic expansion valve.

[0050] Wherein, the valve seat 20 includes a connection seat 21 and a valve port seat 22. The connection seat 21 is installed on the valve body 10, and the connection seat 21 and the valve body 10 enclose to form a valve cavity 11. The installation groove 211 is provided on the connection seat 21, the valve port 221 is provided on the valve port seat 22, a positioning hole is provided on the connection seat 21, the valve port seat 22 is hermetically connected to the positioning hole, and the valve port seat 22 is located on a side of the connection seat 21 away from the valve body 10.

[0051] It should be noted that the driving assembly is connected to the guiding section 51, and the second ventilation hole 511 is provided on the guiding section 51. Therefore, when the driving assembly is connected to the guiding section 51, it will block a part of the second ventilation hole 511, but will not completely block the second ventilation hole 511.

[0052] In one embodiment, the driving assembly includes a coil 31, a rotor 32, a lead screw 33, a preloading spring, a bearing 35, and a bushing 36. The coil 31 is installed on the valve body 10 and is not located within the valve cavity 11. A nut 40 is welded and fixed to the connecting seat 21. The nut 40 is provided with an internal thread, and the lead screw 33 is provided with an external thread. The nut 40 and the lead screw 33 are threadedly connected through the cooperation of the internal thread and the external thread. One end of the lead screw 33 is fixed to the rotor 32, and the other end is rotatably connected to the valve needle 50 through the bearing 35. The preloading spring is sleeved on the lead screw 33, with one end fixed to the lead screw 33 and the other end fixed to the bearing 35. The inner ring of the bearing 35 has a clearance fit with the lead screw 33, and the outer ring has an interference fit or is welded and fixed to the valve needle 50. The bearing 35 is fixed to the end of the lead screw 33 away from the rotor 32, thereby restricting excessive movement of the bearing 35.

[0053] By applying an electric pulse with a certain pattern to the coil 31, the rotor 32 is excited to rotate, thereby driving the lead screw 33 to rotate and move up and down within the nut 40 component, and then driving the valve needle 50 to open and close the valve port 221. By opening and closing the valve needle 50 and the valve port 221, the switching and flow regulation of the electronic expansion valve can be achieved.

[0054] Specifically, the shortest distance between the two straight-line segments of the second vent hole 511 is R1, and R1 ≥ 1.2 mm. If R1 < 1.2 mm, it is necessary to increase the length of the second vent hole 511 in the axial direction of the valve needle 50. However, if the axial length of the second vent hole 511 is increased, the second vent hole 511 will be blocked by the valve seat 20, thereby reducing the ventilation volume of the second vent hole 511. Therefore, if R1 < 1.2 mm, the second vent hole 511 will be too small, resulting in an imbalance in the pressure between the inner and outer cavities at the valve port 221, further increasing the resistance when the valve needle 50 slides, and further reducing the stability and reliability during the operation of the electronic expansion valve. At the same time, the range of R1 ≥ 1.2 mm is relatively large, which reduces the machining accuracy of the valve needle 50, further reducing the production and manufacturing cost of the valve needle 50, and further reducing the production and manufacturing costs of the electronic expansion valve and the refrigeration equipment.

[0055] In one embodiment, the valve seat 20 is provided with a first guiding through hole 212. The mounting groove 211, the first guiding through hole 212, and the valve port 221 are sequentially arranged on the valve seat 20. The guiding section 51 is slidably connected within the first guiding through hole 212. By providing the cooperation between the first guiding through hole 212 and the guiding section 51, the stability and reliability of the valve needle 50 during sliding are increased, and at the same time, the coaxiality between the valve needle 50 and the valve port 221 is improved, enhancing the sealing effect of the valve needle 50.

[0056] Refer to Figures 3 to 7, specifically, the diameter of the first guiding through hole 212 is R2, the maximum outer diameter of the guiding section 51 is R3, and 0.05 mm ≤ (R2 - R3) / 2 ≤ 0.1 mm. If (R2 - R3) / 2 > 0.1 mm, the distance between the first guiding through hole 212 and the guiding section 51 will be too large, thereby reducing the coaxiality between the valve needle 50 and the valve port 221, and further reducing the sealing effect of the valve needle 50. If (R2 - R3) / 2 < 0.05 mm, the distance between the first guiding through hole 212 and the guiding section 51 will be too small, thereby increasing the friction between the guiding section 51 and the hole wall of the first guiding through hole 212 when the valve needle 50 slides up and down, and further increasing the resistance when the valve needle 50 slides. Over time, it will cause excessive friction on the valve needle 50 and / or the hole wall of the first guiding through hole 212, resulting in iron filings falling into the refrigerant system, and further reducing the stability and reliability of the electronic expansion valve and the refrigeration equipment. Therefore, the gap between the first guiding through hole 212 and the guiding section 51 is set between 0.05 and 0.1, thereby improving the coaxiality between the valve needle 50 and the valve port 221, improving the sealing effect of the valve needle 50, and at the same time improving the stability and reliability of the electronic expansion valve and the refrigeration equipment. At the same time, the range of 0.05 mm ≤ (R2 - R3) / 2 ≤ 0.1 mm is relatively large, thereby reducing the processing accuracy of the valve needle 50 and the valve seat 20, further reducing the production and manufacturing costs of the valve seat 20 and the valve needle 50, and further reducing the production and manufacturing costs of the electronic expansion valve and the refrigeration equipment.

[0057] In an embodiment, one end of the nut 40 facing the valve needle 50 is provided with a second guiding through hole 42. The valve cavity 11 and the second guiding through hole 42 are communicated through the first ventilation hole 41. At least part of the guiding section 51 is located in the second guiding through hole 42, and the guiding section 51 is in clearance fit with the second guiding through hole 42. By providing the second guiding through hole 42, the stability and reliability of the valve needle 50 during operation are improved, and the coaxiality between the valve needle 50 and the valve port 221 is improved. Further, the first ventilation hole 41 and the second ventilation hole 511 are communicated through the gap between the guiding section 51 and the second ventilation hole 511.

[0058] Refer to Figures 3 to 14, specifically, the maximum outer diameter of the valve needle 50 is R3, the diameter of the second guiding through hole 42 is R4, and 0.3 mm ≤ (R4 - R3) / 2 ≤ 0.5 mm. If (R4 - R3) / 2 > 0.5 mm, the gap between the second guiding through hole 42 and the guiding section 51 of the valve needle 50 is too large at this time, so that the effect of the second guiding through hole 42 on the guiding section 51 is small, thereby reducing the coaxiality of the valve needle 50 and the valve port 221, and further reducing the sealing effect of the valve needle 50. If (R4 - R3) / 2 < 0.3 mm, it will cause the gap between the second guiding through hole 42 and the guiding section 51 to be too small, so that the air flow exchange channel between the first ventilation hole 41 and the second ventilation hole 511 is small, thereby reducing the function of the first ventilation hole 41 and the second ventilation hole 511 for balancing pressure, and further increasing the operating resistance when the valve needle 50 switches from the state of blocking the valve port 221 to the state of opening the valve port 221, and further reducing the stability and reliability of the operation of the electronic expansion valve. Therefore, by 0.3 mm ≤ (R4 - R3) / 2 ≤ 0.5 mm, the stability and reliability of the operation of the valve needle 50 are improved, and at the same time, the resistance during the operation of the valve needle 50 is reduced, and the stability and reliability of the operation of the electronic expansion valve are improved. At the same time, the range of 0.3 mm ≤ (R4 - R3) / 2 ≤ 0.5 mm is relatively large, thereby reducing the machining accuracy of the valve needle 50 and the nut 40, further reducing the production and manufacturing costs of the nut 40 and the valve needle 50, and further reducing the production and manufacturing costs of the electronic expansion valve and the refrigeration equipment.

[0059] In an embodiment, the second ventilation hole 511 is arranged in a U shape. Of course, in other embodiments, it may also be in a W shape, an O shape, etc. In another embodiment, the second ventilation hole 511 extends to the end face of the valve needle 50 facing the nut 40.

[0060] Specifically, a plurality of the first ventilation holes 41 and / or the second ventilation holes 511 are provided. By providing a plurality of the first ventilation holes 41 and / or the second ventilation holes 511, the ventilation volume between the valve cavity 11 and the third ventilation hole 521 is increased, thereby improving the pressure balance between the inner and outer cavities at the valve port 221, facilitating the operation of the valve needle 50, and further improving the stability and reliability of the operation of the valve needle 50. Preferably, two second ventilation holes 511 are provided.

[0061] The present utility model also proposes a refrigeration device, which includes an electronic expansion valve. The specific structure of the electronic expansion valve refers to the above embodiments. Since this refrigeration device adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated herein one by one.

[0062] The above are only exemplary embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. An electronic expansion valve, characterized in that, Comprising: Valve body; Valve seat, the valve seat is installed on the valve body, and a valve cavity is formed by enclosing the valve seat and the valve body. An installation groove and a valve port are provided on the valve seat; Drive assembly, the drive assembly is installed on the valve body and is located in the valve cavity; Nut, the nut is installed in the installation groove, and a first ventilation hole is provided on the nut; and Valve needle, the valve needle includes a guiding section and a blocking section arranged in sequence. The guiding section is in transmission connection with the drive assembly to drive the valve needle to move in the axial direction, so that the blocking section opens or blocks the valve port; a second ventilation hole is provided on the guiding section, a ventilation channel is provided in the valve needle, and a third ventilation hole is provided on the blocking section. The valve cavity is communicated with the third ventilation hole through the first ventilation hole, the second ventilation hole and the ventilation channel in sequence; Wherein, when the valve needle blocks the valve port, at least part of the second ventilation hole is located on the side of the bottom of the installation groove away from the valve port.

2. The electronic expansion valve according to claim 1, wherein, The shortest distance between two straight line segments of the second ventilation hole is R1, and R1≥1.2mm.

3. The electronic expansion valve according to claim 1, characterized in that, A first guiding through hole is provided on the valve seat, the installation groove, the first guiding through hole and the valve port are sequentially arranged on the valve seat, and the guiding section is slidably connected in the first guiding through hole.

4. The electronic expansion valve according to claim 3, wherein The diameter of the first guiding through hole is R2, and the maximum outer diameter of the guiding section is R3, 0.05mm≤(R2 - R3) / 2≤0.1mm.

5. The electronic expansion valve according to claim 1, wherein One end of the nut facing the valve needle is provided with a second guiding through hole. The valve cavity and the second guiding through hole are communicated through the first ventilation hole. At least part of the guiding section is located in the second guiding through hole, and the guiding section is in clearance fit with the second guiding through hole.

6. The electronic expansion valve according to claim 5, wherein The maximum outer diameter of the valve needle is R3, and the diameter of the second guiding through hole is R4, 0.3mm≤(R4 - R3) / 2≤0.5mm.

7. The electronic expansion valve according to claim 1, characterized in that, The second ventilation hole is arranged in a U shape.

8. The electronic expansion valve according to claim 1, characterized in that, The second ventilation hole extends to the end face of the valve needle facing the nut.

9. The electronic expansion valve according to claim 1, wherein, Multiple first ventilation holes and / or second ventilation holes are provided.

10. A refrigeration device, characterized in that, Comprising the electronic expansion valve according to any one of claims 1 to 9.

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