WO2023143202A1 - Electronic expansion valve - Google Patents

Abstract

An electronic expansion valve, comprising a valve seat member (10); a larger sealing gasket (20), which is arranged inside a cavity of the valve seat member, has a large valve port (21), and is made of a soft material; and a valve needle member (30), which is arranged inside the cavity of the valve seat member and comprises a smaller valve needle (31), a larger valve needle portion (32), and a small sealing gasket (33), the small sealing gasket being arranged in the larger valve needle portion, and the small sealing gasket having a small valve port (331) and being made of a soft material, wherein the larger valve needle portion is configured for cooperating with the large sealing gasket to open and close the large valve port, and the smaller valve needle is configured for cooperating with the small sealing gasket to adjust the opening of the small valve port. In the electronic expansion valve, both of the large sealing gasket and the small sealing gasket are made of the soft material, such that the problem of a poor sealing effect of the electronic expansion valve is solved by means of soft sealing; the smaller valve needle cooperates with the small sealing gasket to adjust the opening of the small valve port, such that small flow regulation is realized; and the larger valve needle portion cooperates with the large sealing gasket to open or close the large valve port, thereby realizing a large flow.

Description

电子膨胀阀Electronic expansion valve

本申请要求于2022年01月30日提交至中国国家知识产权局，申请号为202210114497.4、发明名称为“电子膨胀阀”的专利申请的优先权；本申请要求于2022年01月30日提交至国家知识产权局，申请号为202220250089.7、发明名称为“阀针部件及电子膨胀阀”的专利申请的优先权；本申请要求于2022年01月30日提交至国家知识产权局，申请号为202220250087.8、发明名称为“电子膨胀阀”的专利申请的优先权；本申请要求于2022年01月30日提交至国家知识产权局，申请号为202220250108.6、发明名称为“电子膨胀阀”的专利申请的优先权；本申请要求于2022年01月30日提交至国家知识产权局，申请号为202220249819.1、发明名称为“电子膨胀阀”的专利申请的优先权。This application claims the priority of the patent application submitted to the State Intellectual Property Office of China on January 30, 2022, the application number is 202210114497.4, and the invention name is "electronic expansion valve"; State Intellectual Property Office, the priority of the patent application with application number 202220250089.7 and the invention name "Valve Needle Components and Electronic Expansion Valve"; , the priority of the patent application with the title of invention "electronic expansion valve"; Priority: This application claims the priority of the patent application with the application number 202220249819.1 and the invention name "electronic expansion valve" submitted to the State Intellectual Property Office on January 30, 2022.

技术领域technical field

本申请涉及电子膨胀阀技术领域，具体而言，涉及一种电子膨胀阀。The present application relates to the technical field of electronic expansion valves, in particular, to an electronic expansion valve.

背景技术Background technique

目前，在空调、冰箱、热泵热水器等各类制冷、制热设备中，通常采用电子膨胀阀调节流体的流量。电子膨胀阀通常由阀座部件、阀针部件和大密封垫等结构组成，大密封垫具有大阀口，阀针部件具有小阀口，通过阀针部件的移动，开闭大阀口或调节小阀口的开度，实现流通控制。现有技术中的电子膨胀阀，对于大阀口和小阀口的密封均采用硬密封，这样会导致密封效果差，容易泄露，且难以保证对流量的精确控制。At present, in various refrigeration and heating equipment such as air conditioners, refrigerators, heat pump water heaters, etc., electronic expansion valves are usually used to regulate the flow of fluids. The electronic expansion valve is usually composed of a valve seat part, a valve needle part and a large gasket. The large gasket has a large valve port, and the valve needle part has a small valve port. Through the movement of the valve needle part, the large valve port can be opened or closed or adjusted. The opening of the small valve port realizes flow control. The electronic expansion valve in the prior art adopts hard seals for both the large valve port and the small valve port, which will lead to poor sealing effect, easy leakage, and difficult to ensure accurate control of the flow rate.

申请内容application content

本申请提供了一种电子膨胀阀，以解决现有技术中电子膨胀阀密封效果差的问题。The present application provides an electronic expansion valve to solve the problem of poor sealing effect of the electronic expansion valve in the prior art.

为了解决上述问题，本申请提供了一种电子膨胀阀，包括：阀座部件；大密封垫，设置在阀座部件的腔体内，大密封垫具有大阀口，大密封垫由软质材料制成；阀针部件，设置在阀座部件的腔体内，阀针部件包括小阀针、大阀针部和小密封垫，小密封垫设置在大阀针部内，小密封垫具有小阀口，小密封垫由软质材料制成；其中，大阀针部用于和大密封垫配合以开闭大阀口，小阀针用于和小密封垫配合以调整小阀口的开度。In order to solve the above problems, the application provides an electronic expansion valve, including: a valve seat part; a large sealing gasket, which is arranged in the cavity of the valve seat part, the large sealing gasket has a large valve port, and the large sealing gasket is made of soft material The valve needle part is arranged in the cavity of the valve seat part, the valve needle part includes a small valve needle, a large valve needle part and a small sealing gasket, the small sealing gasket is arranged in the large valve needle part, and the small sealing gasket has a small valve port, The small sealing gasket is made of soft material; wherein, the large valve needle part is used to cooperate with the large sealing gasket to open and close the large valve port, and the small valve needle is used to cooperate with the small sealing gasket to adjust the opening of the small valve port.

进一步地，小阀口为锥形结构，小阀口开口小的一端朝向大阀口。Further, the small valve port has a tapered structure, and the end of the small valve port with a small opening faces the large valve port.

进一步地，大阀口的端面为密封平面，大阀针部的一端和密封平面抵接的情况下，大阀口关闭。Further, the end face of the large valve port is a sealing plane, and when one end of the large valve needle portion abuts against the sealing plane, the large valve port is closed.

进一步地，小密封垫的材质为塑料或橡胶，大密封垫的材质为塑料或橡胶。 Further, the material of the small sealing pad is plastic or rubber, and the material of the large sealing pad is plastic or rubber.

进一步地，大阀针部具有导向孔，导向孔位于小阀口背离大阀口的一侧，小阀针可轴向移动地穿过导向孔；阀针部件还包括第一内密封圈，第一内密封圈位于小阀针的外壁和导向孔的内壁之间。Further, the large valve needle part has a guide hole, the guide hole is located on the side of the small valve port away from the large valve port, and the small valve needle can axially move through the guide hole; the valve needle part also includes a first inner sealing ring, the second An inner sealing ring is located between the outer wall of the small valve needle and the inner wall of the guide hole.

进一步地，大阀针部可轴向移动地设置在阀座部件的腔体内，阀针部件还包括第二内密封圈，第二内密封圈设置在阀座部件的内壁和大阀针部的外壁之间。Further, the large valve needle part is arranged axially movable in the cavity of the valve seat part, and the valve needle part further includes a second inner sealing ring, and the second inner sealing ring is arranged on the inner wall of the valve seat part and between the large valve needle part. between the outer walls.

进一步地，阀针部件还包括驱动组件，驱动组件包括螺杆和连接套，连接套的一端和小阀针连接，螺杆和连接套在轴向限位配合，螺杆可轴向移动地设置，以带动小阀针移动。Further, the valve needle part also includes a drive assembly, the drive assembly includes a screw and a connecting sleeve, one end of the connecting sleeve is connected to the small valve needle, the screw rod and the connecting sleeve are axially limited, and the screw is axially movable to drive The small valve needle moves.

进一步地，驱动组件还包括设置在连接套内的滚动结构，连接套和螺杆分别和滚动结构配合，以使连接套不随螺杆转动。Further, the driving assembly also includes a rolling structure arranged in the connecting sleeve, and the connecting sleeve and the screw rod cooperate with the rolling structure respectively so that the connecting sleeve does not rotate with the screw rod.

进一步地，小阀针远离小阀口的一端穿入连接套并和连接套固定连接，滚动结构为轴承，驱动组件还包括设置在连接套内的衬套和弹性件，轴承套在螺杆的一端，轴承的一侧和连接套在轴向限位配合，轴承的另一侧、衬套、弹性件和小阀针依次抵接。Further, the end of the small valve needle away from the small valve port penetrates into the connecting sleeve and is fixedly connected with the connecting sleeve. The rolling structure is a bearing. The drive assembly also includes a bush and an elastic member arranged in the connecting sleeve, and the bearing is sleeved on one end of the screw rod. One side of the bearing and the connecting sleeve are axially limited in fit, and the other side of the bearing, the bushing, the elastic member and the small valve needle are sequentially abutted against.

进一步地，阀针部件内具有相对的第一止挡面和第二止挡面，第一止挡面和第二止挡面限定小阀针的移动范围；螺杆可在预设行程内带动小阀针单独移动，且螺杆可通过小阀针带动大阀针部移动。Further, the valve needle part has a first stop surface and a second stop surface opposite to each other, and the first stop surface and the second stop surface limit the movement range of the small valve needle; the screw can drive the small valve needle within a preset stroke. The valve needle moves independently, and the screw can drive the large valve needle to move through the small valve needle.

进一步地，电子膨胀阀还包括加强密封圈，加强密封圈设置在大密封垫和阀座部件的内壁之间。Further, the electronic expansion valve further includes a reinforced sealing ring, and the reinforced sealing ring is arranged between the large sealing gasket and the inner wall of the valve seat component.

进一步地，电子膨胀阀还包括设置在阀座部件的腔体内的大限位结构，大限位结构和大密封垫朝向大阀针部的一侧抵接，以压紧大密封垫。Further, the electronic expansion valve further includes a large stop structure disposed in the cavity of the valve seat component, and the large stop structure abuts against the side of the large valve needle facing the large valve needle to compress the large seal.

进一步地，电子膨胀阀还包括设置在大阀针部内的小限位结构，小限位结构和小密封垫背离小阀针的一侧抵接。Further, the electronic expansion valve further includes a small limiting structure arranged in the large valve needle, and the small limiting structure abuts against a side of the small sealing gasket away from the small valve needle.

进一步地，大阀针部具有限位槽，限位槽的开口朝向小限位结构，小密封垫的厚度大于限位槽的深度，小限位结构和小密封垫凸出于限位槽的一侧抵接。Further, the large valve needle part has a limiting groove, the opening of the limiting groove faces the small limiting structure, the thickness of the small sealing gasket is greater than the depth of the limiting groove, and the small limiting structure and the small sealing gasket protrude out of the limiting groove. Butt on one side.

应用本申请的技术方案，提供了一种电子膨胀阀，包括：阀座部件；大密封垫，设置在阀座部件的腔体内，大密封垫具有大阀口，大密封垫由软质材料制成；阀针部件，设置在阀座部件的腔体内，阀针部件包括小阀针、大阀针部和小密封垫，小密封垫设置在大阀针部内，小密封垫具有小阀口，小密封垫由软质材料制成；其中，大阀针部用于和大密封垫配合以开闭大阀口，小阀针用于和小密封垫配合以调整小阀口的开度。采用该方案，大密封垫和小密封垫均由软质材料制成，这样对大阀口和小阀口均实现了软密封，采用软密封的密封方式可提高密封时的有效接触面积，有效解决了电子膨胀阀密封效果差的问题，避免泄漏。其中，设置小阀针，用于和小密封垫配合来调整小阀口的开度，从而实现了小流量的调节；设置大阀针部，用于和大密封垫配合来打开或关闭大阀口，从而实现了大流量。 Applying the technical solution of the present application, an electronic expansion valve is provided, including: a valve seat part; a large sealing gasket arranged in the cavity of the valve seat part, the large sealing gasket has a large valve port, and the large sealing gasket is made of soft material The valve needle part is arranged in the cavity of the valve seat part, the valve needle part includes a small valve needle, a large valve needle part and a small sealing gasket, the small sealing gasket is arranged in the large valve needle part, and the small sealing gasket has a small valve port, The small sealing gasket is made of soft material; wherein, the large valve needle part is used to cooperate with the large sealing gasket to open and close the large valve port, and the small valve needle is used to cooperate with the small sealing gasket to adjust the opening of the small valve port. With this scheme, both the large gasket and the small gasket are made of soft materials, so that both the large valve port and the small valve port are soft-sealed, and the soft-sealed sealing method can increase the effective contact area during sealing, and effectively The problem of poor sealing effect of the electronic expansion valve is solved to avoid leakage. Among them, a small valve needle is set to cooperate with a small gasket to adjust the opening of the small valve port, thereby realizing the adjustment of a small flow rate; a large valve needle is set to cooperate with a large gasket to open or close the large valve mouth, thus achieving a large flow.

附图说明Description of drawings

构成本申请的一部分的说明书附图用来提供对本申请的进一步理解，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。在附图中：The accompanying drawings constituting a part of the present application are used to provide further understanding of the present application, and the schematic embodiments and descriptions of the present application are used to explain the present application, and do not constitute an improper limitation of the present application. In the attached picture:

图1示出了本申请的实施例提供的电子膨胀阀的剖视图一；FIG. 1 shows a first cross-sectional view of an electronic expansion valve provided by an embodiment of the present application;

图2示出了图1中小阀针和小密封垫的剖视图；Fig. 2 shows a sectional view of a small valve needle and a small gasket in Fig. 1;

图3示出了图1中大阀针部和大密封垫的剖视图；Fig. 3 shows a cross-sectional view of the large valve needle part and the large sealing gasket in Fig. 1;

图4示出了本申请的实施例提供的阀针部件的剖视图；Fig. 4 shows a cross-sectional view of a valve needle component provided by an embodiment of the present application;

图5示出了图4中大阀针部、第一内密封圈、第一压套和第二压套的剖视图；Fig. 5 shows a sectional view of the large valve needle part, the first inner sealing ring, the first compression sleeve and the second compression sleeve in Fig. 4;

图6示出了图4中大阀针部的剖视图；Fig. 6 shows a sectional view of the large valve needle part in Fig. 4;

图7示出了图4中第二压套的剖视图；Figure 7 shows a cross-sectional view of the second gland in Figure 4;

图8示出了本申请的实施例提供的电子膨胀阀的剖视图二；Fig. 8 shows the second cross-sectional view of the electronic expansion valve provided by the embodiment of the present application;

图9示出了图8中阀座部件的剖视图；Figure 9 shows a cross-sectional view of the valve seat part in Figure 8;

图10示出了图8中阀座环的剖视图；Figure 10 shows a cross-sectional view of the seat ring in Figure 8;

图11示出了本申请的实施例提供的电子膨胀阀的剖视图三；Figure 11 shows a third cross-sectional view of the electronic expansion valve provided by the embodiment of the present application;

图12示出了图11中阀座部件、大密封垫、加强密封圈和大限位结构的剖视图；Figure 12 shows a cross-sectional view of the valve seat part, the large sealing gasket, the reinforced sealing ring and the large limit structure in Figure 11;

图13示出了图12中的***图；Figure 13 shows an exploded view in Figure 12;

图14示出了本申请的实施例提供的电子膨胀阀的剖视图五；Fig. 14 shows the fifth cross-sectional view of the electronic expansion valve provided by the embodiment of the present application;

图15示出了图14中电子膨胀阀部分结构的剖视图。FIG. 15 shows a cross-sectional view of a partial structure of the electronic expansion valve in FIG. 14 .

其中，上述附图包括以下附图标记：Wherein, the above-mentioned accompanying drawings include the following reference signs:

10、阀座部件；13、第一流通孔；14、第二流通孔；15、第三环形台阶；16、第一容纳槽；17、底座；10. Valve seat part; 13. First flow hole; 14. Second flow hole; 15. Third annular step; 16. First accommodation groove; 17. Base;

20、大密封垫；21、大阀口；211、密封平面；23、第六环形台阶；25、第七环形台阶；20. Large gasket; 21. Large valve port; 211. Sealing plane; 23. The sixth annular step; 25. The seventh annular step;

30、阀针部件；31、小阀针；71、限位杆；72、封堵杆；32、大阀针部；321、导向孔；322、限位槽；11、第一环形台阶；12、第二环形台阶；411、密封面；212、放置槽；213、侧开孔；33、小密封垫；331、小阀口；34、驱动组件；341、螺杆；342、连接套；343、滚动结构；344、衬套；345、弹性件；35、第一止挡面；36、第二止挡面；37、第一内密封圈；38、第二内密封圈；30. Valve needle part; 31. Small valve needle; 71. Limiting rod; 72. Blocking rod; 32. Large valve needle part; 321. Guide hole; 322. Limiting groove; 11. The first annular step; 12 , second annular step; 411, sealing surface; 212, placement groove; 213, side opening; 33, small sealing gasket; 331, small valve port; 34, driving assembly; 341, screw rod; 342, connecting sleeve; 343, Rolling structure; 344, bushing; 345, elastic member; 35, first stop surface; 36, second stop surface; 37, first inner sealing ring; 38, second inner sealing ring;

40、加强密封圈； 40. Strengthen the sealing ring;

50、大限位结构；51、压紧环；52、连接环；50. Large limit structure; 51. Compression ring; 52. Connecting ring;

60、小限位结构；60. Small limit structure;

70、第一压套；70. The first pressure sleeve;

80、第二压套；41、第一圆筒段；42、过渡段；43、第二圆筒段；44、密封槽；80, the second pressure sleeve; 41, the first cylinder section; 42, the transition section; 43, the second cylinder section; 44, the sealing groove;

90、阀座环；91、环形避让槽；92、第四环形台阶；93、第二容纳槽；22、第五环形台阶；24、操作孔；94、第一筒段；95、第二筒段；96、第三筒段；97、连接段；98、导向段；90. Valve seat ring; 91. Annular avoidance groove; 92. Fourth annular step; 93. Second accommodation groove; 22. Fifth annular step; 24. Operation hole; 94. First cylinder section; 95. Second cylinder Section; 96, the third barrel section; 97, connecting section; 98, guiding section;

100、阀套。100, valve sleeve.

具体实施方式Detailed ways

下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述。显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。以下对至少一个示例性实施例的描述实际上仅仅是说明性的，决不作为对本申请及其应用或使用的任何限制。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Apparently, the described embodiments are only some of the embodiments of this application, not all of them. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as any limitation of the application, its application or uses. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

如图1至图3所示，本申请的实施例提供了一种电子膨胀阀，包括：阀座部件10；大密封垫20，设置在阀座部件10的腔体内，大密封垫20具有大阀口21，大密封垫20由软质材料制成；阀针部件30，设置在阀座部件10的腔体内，阀针部件30包括小阀针31、大阀针部32和小密封垫33，小密封垫33设置在大阀针部32内，小密封垫33具有小阀口331，小密封垫33由软质材料制成；其中，大阀针部32用于和大密封垫20配合以开闭大阀口21，小阀针31用于和小密封垫33配合以调整小阀口331的开度。As shown in Figures 1 to 3, the embodiment of the present application provides an electronic expansion valve, including: a valve seat part 10; The valve port 21 and the large sealing gasket 20 are made of soft materials; the valve needle part 30 is arranged in the cavity of the valve seat part 10, and the valve needle part 30 includes a small valve needle 31, a large valve needle part 32 and a small sealing gasket 33 , the small sealing gasket 33 is arranged in the large valve needle part 32, the small sealing gasket 33 has a small valve port 331, and the small sealing gasket 33 is made of soft material; wherein, the large valve needle part 32 is used to cooperate with the large sealing gasket 20 To open and close the large valve port 21 , the small valve needle 31 is used to cooperate with the small sealing gasket 33 to adjust the opening of the small valve port 331 .

采用该方案，大密封垫20和小密封垫33均由软质材料制成，这样对大阀口21和小阀口331均实现了软密封，采用软密封的密封方式可提高密封时的有效接触面积，有效解决了电子膨胀阀密封效果差的问题，避免泄漏。其中，设置小阀针31，用于和小密封垫33配合来调整小阀口331的开度，从而实现了小流量的调节；设置大阀针部32，用于和大密封垫20配合来打开或关闭大阀口21，从而实现了大流量。其中，软质材料可为塑料或橡胶，优选PEEK材料、PTFE材料。该电子膨胀阀可安装到安装基台或阀体内使用。With this scheme, both the large gasket 20 and the small gasket 33 are made of soft materials, so that both the large valve port 21 and the small valve port 331 are soft-sealed, and the soft-sealed sealing method can improve the sealing efficiency. The contact area effectively solves the problem of poor sealing effect of the electronic expansion valve and avoids leakage. Among them, the small valve needle 31 is set to adjust the opening of the small valve port 331 in cooperation with the small sealing gasket 33, thereby realizing the adjustment of the small flow rate; the large valve needle part 32 is set to cooperate with the large sealing gasket 20 to Open or close the large valve port 21, thereby realizing a large flow. Wherein, the soft material can be plastic or rubber, preferably PEEK material and PTFE material. The electronic expansion valve can be installed on the installation base or in the valve body.

其中，小阀口331为锥形结构，小阀口331开口小的一端朝向大阀口21。将小阀口331设置为锥形，并且小阀口331开口大的一端朝向大阀口21，这样在小阀针31和小阀口331的配合下，能够更精确地实现流量调节，满足使用要求。Wherein, the small valve port 331 has a tapered structure, and the small opening end of the small valve port 331 faces the large valve port 21 . The small valve port 331 is set in a tapered shape, and the end of the small valve port 331 with a large opening faces the large valve port 21, so that with the cooperation of the small valve needle 31 and the small valve port 331, the flow rate can be adjusted more accurately to meet the needs of the user. Require.

具体地，大阀口21的端面为密封平面211，大阀针部32的一端和密封平面抵接的情况下，大阀口21关闭。通过将大阀口21的端面设置为密封平面211，当大阀口21处在关闭状态下的时候，使得大阀针部32的一端和密封平面211进行抵接，相对于斜面密封的方式，密封更加可靠，并且这样能够实现最大的流通面积，从而提高了电子膨胀阀的流量。 Specifically, the end face of the large valve port 21 is a sealing plane 211 , and when one end of the large valve needle portion 32 abuts against the sealing plane, the large valve port 21 is closed. By setting the end face of the large valve port 21 as a sealing plane 211, when the large valve port 21 is in a closed state, one end of the large valve needle portion 32 is made to abut against the sealing plane 211, compared to the way of sealing on an inclined plane, The seal is more reliable, and this enables the largest flow area, which increases the flow rate of the electronic expansion valve.

在本实施例中，小密封垫33的材质为塑料或橡胶，大密封垫20的材质为塑料或橡胶。将小密封垫33和大密封垫20的材质均设置成塑料或橡胶，采用上述两种材质密封性好、耐磨、成本低。In this embodiment, the material of the small sealing pad 33 is plastic or rubber, and the material of the large sealing pad 20 is plastic or rubber. The materials of the small sealing pad 33 and the large sealing pad 20 are both set to be plastic or rubber, and the above two materials are used for good sealing performance, wear resistance and low cost.

具体地，大阀针部32具有导向孔321，导向孔321位于小阀口331背离大阀口21的一侧，小阀针31可轴向移动地穿过导向孔321；阀针部件30还包括第一内密封圈37，第一内密封圈37位于小阀针31的外壁和导向孔321的内壁之间。通过设置导向孔321，能够对小阀针31在轴向移动时起到导向作用；将第一内密封圈37设置在小阀针31的外壁和导向孔321的内壁之间，这样能够保证小阀针31的外壁和导向孔321的内壁之间的密封性，防止流体泄露。Specifically, the large valve needle part 32 has a guide hole 321, the guide hole 321 is located on the side of the small valve port 331 away from the large valve port 21, and the small valve needle 31 can axially move through the guide hole 321; the valve needle part 30 also The first inner sealing ring 37 is included, and the first inner sealing ring 37 is located between the outer wall of the small valve needle 31 and the inner wall of the guide hole 321 . By setting the guide hole 321, the small valve needle 31 can be guided when it moves axially; the first inner sealing ring 37 is arranged between the outer wall of the small valve needle 31 and the inner wall of the guide hole 321, which can ensure the small The tightness between the outer wall of the valve needle 31 and the inner wall of the guide hole 321 prevents fluid leakage.

可选地，导向孔321的内壁具有密封槽，第一内密封圈37设置在密封槽内。Optionally, the inner wall of the guide hole 321 has a sealing groove, and the first inner sealing ring 37 is disposed in the sealing groove.

在本实施例中，大阀针部32可轴向移动地设置在阀座部件10的腔体内，阀针部件30还包括第二内密封圈38，第二内密封圈38设置在阀座部件10的内壁和大阀针部32的外壁之间。将第二内密封圈38设置在阀座部件10的内壁和大阀针部32的外壁之间，这样能够保证阀座部件10的内壁和大阀针部32的外壁之间的密封性，防止流体泄露。In this embodiment, the large valve needle part 32 is arranged axially movable in the cavity of the valve seat part 10, the valve needle part 30 further includes a second inner sealing ring 38, and the second inner sealing ring 38 is arranged on the valve seat part Between the inner wall of 10 and the outer wall of the large needle part 32. The second inner sealing ring 38 is arranged between the inner wall of the valve seat part 10 and the outer wall of the large valve needle part 32, which can ensure the sealing performance between the inner wall of the valve seat part 10 and the outer wall of the large valve needle part 32, and prevent Fluid leak.

可选地，大阀针部32的外壁具有密封槽，第二内密封圈38设置在密封槽内。Optionally, the outer wall of the large valve needle portion 32 has a sealing groove, and the second inner sealing ring 38 is disposed in the sealing groove.

如图1所示，阀针部件30还包括驱动组件34，驱动组件34包括螺杆341和连接套342，连接套342的一端和小阀针31连接，螺杆341和连接套342在轴向限位配合，螺杆341可轴向移动地设置，以带动小阀针31移动。采用上述设置方式，螺杆341和连接套342在轴向限位配合，且连接套342的一端和小阀针31连接，这样当螺杆341在轴向上移动时，能够带动连接套342轴向移动，进而连接套342带动小阀针31轴向移动。As shown in Figure 1, the valve needle part 30 also includes a drive assembly 34, the drive assembly 34 includes a screw rod 341 and a connecting sleeve 342, one end of the connecting sleeve 342 is connected to the small valve needle 31, and the screw rod 341 and the connecting sleeve 342 are limited in the axial direction. Cooperating, the screw rod 341 is arranged axially movable to drive the small valve needle 31 to move. With the above-mentioned setting method, the screw rod 341 and the connecting sleeve 342 are limited in the axial direction, and one end of the connecting sleeve 342 is connected to the small valve needle 31, so that when the screw rod 341 moves in the axial direction, it can drive the connecting sleeve 342 to move axially. , and then the connecting sleeve 342 drives the small valve needle 31 to move axially.

其中，驱动组件34还包括设置在连接套342内的滚动结构343，连接套342和螺杆341分别和滚动结构343配合，以使连接套342不随螺杆341转动。通过设置滚动结构343，且连接套342和螺杆341分别和滚动结构343配合，这样当螺杆341转动时，由于滚动结构343的设置，避免了连接套342随螺杆341进行转动，从而避免了小阀针31相对小密封垫33转动而造成小密封垫33的磨损，因此提高了小密封垫33的寿命。Wherein, the driving assembly 34 further includes a rolling structure 343 disposed in the connecting sleeve 342 , and the connecting sleeve 342 and the screw rod 341 respectively cooperate with the rolling structure 343 so that the connecting sleeve 342 does not rotate with the screw rod 341 . By setting the rolling structure 343, and the connecting sleeve 342 and the screw rod 341 cooperate with the rolling structure 343 respectively, when the screw rod 341 rotates, due to the setting of the rolling structure 343, the connecting sleeve 342 is prevented from rotating with the screw rod 341, thereby avoiding the small valve The rotation of the needle 31 relative to the small sealing pad 33 causes wear of the small sealing pad 33 , thus improving the life of the small sealing pad 33 .

进一步地，小阀针31远离小阀口331的一端穿入连接套342并和连接套342固定连接，滚动结构343为轴承，驱动组件34还包括设置在连接套342内的衬套344和弹性件345，轴承套在螺杆341的一端，轴承的一侧和连接套342在轴向限位配合，轴承的另一侧、衬套344、弹性件345和小阀针31依次抵接。将小阀针31的一端穿入连接套342并和连接套342固定连接，固定连接的方式为焊接，可靠、稳定；将滚动结构设置为轴承，回转精度高、承载能力高，并且通过将轴承套在螺杆341的一端，轴承的一侧和连接套342在轴向限位配合，这样既能够对轴承进行限位，又能够保证当螺杆341在转动时，防止连接套342也进行转动，进一步避免了小阀针31转动；将轴承的另一侧、衬套344、弹性件345和小阀针31依次抵接，其中，设置衬套344，既能够避免了弹性件345直接与轴承抵接，又可以起到导向的作用；设置弹性件345，当电子膨胀阀处于关闭状态时，弹性件345处于被压缩状态，当螺杆341在向远离小阀口331的一侧移动时，即在流量调节状态下时，弹性件345的弹力被释放，带动衬 套344向远离小阀口331的一侧移动，，从而实现了对小阀口331开度的精确控制，进而提高了小流量调节的控制精度。其中，弹性件345可采用弹簧。Furthermore, the end of the small valve needle 31 away from the small valve port 331 penetrates into the connecting sleeve 342 and is fixedly connected with the connecting sleeve 342, the rolling structure 343 is a bearing, and the driving assembly 34 also includes a bushing 344 and an elastic Part 345, the bearing is sleeved at one end of the screw rod 341, one side of the bearing and the connecting sleeve 342 are limited in the axial direction, and the other side of the bearing, the bushing 344, the elastic member 345 and the small valve needle 31 are sequentially abutted. One end of the small valve needle 31 is inserted into the connecting sleeve 342 and fixedly connected with the connecting sleeve 342. The fixed connection method is welding, which is reliable and stable; the rolling structure is set as a bearing, which has high rotation accuracy and high bearing capacity, and the bearing Covered on one end of the screw rod 341, one side of the bearing and the connecting sleeve 342 are limited in the axial direction, so that the bearing can be limited, and it can be ensured that when the screw rod 341 is rotating, the connecting sleeve 342 is also prevented from rotating. The rotation of the small valve needle 31 is avoided; the other side of the bearing, the bushing 344, the elastic member 345 and the small valve needle 31 are sequentially abutted, wherein the bushing 344 is provided to prevent the elastic member 345 from directly contacting the bearing , can also play a guiding role; the elastic member 345 is provided. When the electronic expansion valve is in the closed state, the elastic member 345 is in a compressed state. When the screw 341 moves to the side away from the small valve port 331, that is, the flow When in the adjusted state, the elastic force of the elastic member 345 is released, driving the lining The sleeve 344 moves to the side away from the small valve port 331, thereby realizing precise control of the opening of the small valve port 331, and further improving the control accuracy of small flow regulation. Wherein, the elastic member 345 can adopt a spring.

具体地，阀针部件30内具有相对的第一止挡面35和第二止挡面36，第一止挡面35和第二止挡面36限定小阀针31的移动范围；螺杆341可在预设行程内带动小阀针31单独移动，且螺杆341可通过小阀针31带动大阀针部32移动。通过设置第一止挡面35，这样当小阀针31向靠近小阀口331的一侧移动的过程中，能够起到限位的作用；设置第二止挡面36，当小阀针31向远离小阀口331的一侧移动的过程中，能够起到限位作用，从而限定了小阀针31的移动范围。在本实施例中，当螺杆341在轴向上移动时，能够带动小阀针31轴向移动来调节小阀口331的开度，从而实现了小流量调节；当螺杆341带动小阀针31移动至完全避让小阀口331时，小阀针31带动大阀针部32进行移动来调节大阀口21的开度，从而实现大流量。Specifically, the valve needle part 30 has a first stop surface 35 and a second stop surface 36 opposite to each other, and the first stop surface 35 and the second stop surface 36 limit the moving range of the small valve needle 31; the screw rod 341 can The small valve needle 31 is driven to move independently within the predetermined stroke, and the screw rod 341 can drive the large valve needle part 32 to move through the small valve needle 31 . By setting the first stop surface 35, when the small valve needle 31 moves to the side close to the small valve port 331, it can play a position-limiting role; by setting the second stop surface 36, when the small valve needle 31 In the process of moving to the side away from the small valve port 331 , it can function as a stop, thereby limiting the moving range of the small valve needle 31 . In this embodiment, when the screw rod 341 moves in the axial direction, it can drive the small valve needle 31 to move axially to adjust the opening of the small valve port 331, thereby realizing small flow adjustment; when the screw rod 341 drives the small valve needle 31 When moving to completely avoid the small valve port 331 , the small valve needle 31 drives the large valve needle portion 32 to move to adjust the opening of the large valve port 21 , thereby realizing a large flow rate.

在本实施例中，电子膨胀阀还包括加强密封圈40，加强密封圈40设置在大密封垫20和阀座部件10的内壁之间。通过将加强密封圈40设置在大密封垫20和阀座部件10的内壁之间，这样能够保证大密封垫20和阀座部件10的内壁之间的密封性，防止流体泄露。在长期使用后，即使大密封垫20发生了变形，由于设置有加强密封圈40，仍能够保证密封效果。In this embodiment, the electronic expansion valve further includes a reinforced sealing ring 40 , and the reinforced sealing ring 40 is arranged between the large sealing gasket 20 and the inner wall of the valve seat part 10 . By arranging the reinforcing sealing ring 40 between the large sealing gasket 20 and the inner wall of the valve seat part 10, the tightness between the large sealing gasket 20 and the inner wall of the valve seat part 10 can be ensured and fluid leakage can be prevented. After long-term use, even if the large sealing pad 20 is deformed, the sealing effect can still be guaranteed due to the provision of the reinforced sealing ring 40 .

具体地，电子膨胀阀还包括设置在阀座部件10的腔体内的大限位结构50，大限位结构50和大密封垫20朝向大阀针部32的一侧抵接，以压紧大密封垫20。通过设置大限位结构50，用于压紧大密封垫20，确保大密封垫20不会发生脱落。Specifically, the electronic expansion valve further includes a large stop structure 50 disposed in the cavity of the valve seat component 10, and the large stop structure 50 and the large sealing gasket 20 abut against the side of the large valve needle portion 32 to compress the large Gasket 20. By setting the large stop structure 50 for pressing the large sealing gasket 20, it is ensured that the large sealing gasket 20 will not fall off.

可选地，大密封垫20朝向大阀针部32的一端具有环形槽，环形槽和大限位结构50配合；大密封垫20远离大阀针部32的一端具有避让槽，加强密封圈40设置在避让槽内；大密封垫20具有中心孔，中心孔形成大阀口21。由于大密封垫20在长时间使用后，容易发生变形，因此装配后大密封垫20和阀座部件10的内壁之间会出现泄漏现象，采用该方案，将加强密封圈40设置在大密封垫20和阀座部件10的内壁之间，这样进一步提高了大阀口21的密封效果，有效避免了流体泄露，同时也提高了电子膨胀阀的使用寿命。Optionally, the end of the large sealing gasket 20 facing the large valve needle portion 32 has an annular groove, and the annular groove cooperates with the large stop structure 50; the end of the large sealing gasket 20 away from the large valve needle portion 32 has an escape groove to strengthen the sealing ring 40 It is arranged in the avoidance groove; the large sealing gasket 20 has a central hole, and the central hole forms a large valve port 21 . Since the large sealing gasket 20 is prone to deformation after long-term use, there will be leakage between the large sealing gasket 20 and the inner wall of the valve seat part 10 after assembly. With this scheme, the reinforcing sealing ring 40 is arranged on the large sealing gasket 20 and the inner wall of the valve seat part 10, this further improves the sealing effect of the large valve port 21, effectively avoids fluid leakage, and also improves the service life of the electronic expansion valve.

可选地，大限位结构50包括相互连接的压紧环和连接环，压紧环和大密封垫20抵接，连接环位于压紧环背离大密封垫20的一侧，连接环和阀座部件10的内壁焊接。通过设置压紧环，便于和大密封垫20抵接，以压紧大密封垫20；将连接环设置在位于压紧环背离大密封垫20的一侧，这样便于和阀座部件10的内壁进行焊接，保证了大密封垫20不会发生脱落，同时也能够远离大密封垫20和加强密封圈40，防止焊接时的热量过高，导致大密封垫20和加强密封圈40发生变形。Optionally, the large limit structure 50 includes a compression ring and a connecting ring connected to each other, the compression ring and the large sealing gasket 20 abut, the connecting ring is located on the side of the compression ring away from the large sealing gasket 20, the connecting ring and the valve The inner wall of the seat member 10 is welded. By setting the compression ring, it is convenient to abut against the large sealing gasket 20 to compress the large sealing gasket 20; Welding ensures that the large sealing pad 20 will not fall off, and at the same time it can be kept away from the large sealing pad 20 and the reinforced sealing ring 40 to prevent the excessive heat during welding from causing deformation of the large sealing pad 20 and the reinforced sealing ring 40 .

可选地，在本实施例中，大限位结构50朝向大密封垫20的一端的外侧壁具有倒角或圆角。通过在大限位结构50朝向大密封垫20的一端的外侧壁设置倒角或圆角，在安装大限位结构50时能够起到导向作用，便于安装。Optionally, in this embodiment, the outer sidewall of the large stop structure 50 towards the end of the large sealing gasket 20 has chamfered or rounded corners. By setting chamfers or rounded corners on the outer wall of the end of the large limiting structure 50 facing the large gasket 20 , it can play a guiding role when installing the large limiting structure 50 and facilitate installation.

在本实施例中，电子膨胀阀还包括设置在大阀针部32内的小限位结构60，小限位结构60和小密封垫33背离小阀针31的一侧抵接。通过设置小限位结构60，用于压紧小密封垫33，确保小密封垫33不会发生脱落。采用该方案，将小密封垫33设置在大阀针部32的腔体内， 且通过小限位结构60和小密封垫33背离小阀针31的一侧限位配合，这样设置，小限位结构60能够对小密封垫33起到限位作用，以压紧小密封垫33，有效防止了由于长时间使用后小密封垫33发生变形而导致的小密封垫33脱落，而降低小阀口331密封效果的问题。该电子膨胀阀可安装到安装基台或阀体内使用。In this embodiment, the electronic expansion valve further includes a small limiting structure 60 disposed in the large valve needle portion 32 , and the small limiting structure 60 abuts against the side of the small sealing gasket 33 away from the small valve needle 31 . The small stopper structure 60 is provided to compress the small sealing gasket 33 to ensure that the small sealing gasket 33 will not fall off. With this solution, the small sealing gasket 33 is arranged in the cavity of the large valve needle part 32, And through the limited cooperation between the small limit structure 60 and the side of the small sealing gasket 33 away from the small valve needle 31, in this way, the small limit structure 60 can limit the small sealing gasket 33 to compress the small sealing gasket 33. It effectively prevents the small sealing gasket 33 from falling off due to the deformation of the small sealing gasket 33 after long-term use, thereby reducing the sealing effect of the small valve port 331. The electronic expansion valve can be installed on the installation base or in the valve body.

其中，大阀针部32具有限位槽322，限位槽322的开口朝向小限位结构60，小密封垫33的厚度大于限位槽322的深度，小限位结构60和小密封垫33凸出于限位槽322的一侧抵接。通过设置限位槽322，便于安装小密封垫33，将小密封垫33的厚度设置成大于限位槽322的深度，这样使得小限位结构60和小密封垫33的一侧抵接，保证了小密封垫33的密封效果。Wherein, the large valve needle portion 32 has a limiting groove 322, the opening of the limiting groove 322 faces the small limiting structure 60, the thickness of the small sealing gasket 33 is greater than the depth of the limiting groove 322, the small limiting structure 60 and the small sealing gasket 33 One side protruding from the limiting groove 322 abuts against it. By arranging the limiting groove 322, it is convenient to install the small sealing gasket 33, and the thickness of the small sealing gasket 33 is set to be greater than the depth of the limiting groove 322, so that one side of the small limiting structure 60 and the small sealing gasket 33 abuts to ensure that The sealing effect of small gasket 33 is improved.

可选地，大阀针部32还具有第二限位槽，第二限位槽的径向尺寸大于限位槽322，限位槽322和第二限位槽形成阶梯结构，小限位结构60为环形结构，小限位结构60的外侧壁和第二限位槽的内侧壁焊接，小限位结构60和小阀口331同轴设置，小限位结构60的内径大于等于小阀口331的最小径向尺寸。Optionally, the large valve needle part 32 also has a second limit groove, the radial dimension of the second limit groove is larger than the limit groove 322, the limit groove 322 and the second limit groove form a stepped structure, and the small limit structure 60 is an annular structure, the outer wall of the small limiting structure 60 is welded to the inner wall of the second limiting groove, the small limiting structure 60 and the small valve port 331 are coaxially arranged, and the inner diameter of the small limiting structure 60 is greater than or equal to the small valve port 331 minimum radial dimension.

可选地，在本实施例中，电子膨胀阀还包括阀套，阀座部件10包括阀座环和底座，阀套、阀座环和底座依次连接；电子膨胀阀还包括螺母结构，螺母结构位于阀套内，螺母结构和阀套的内壁之间的区域形成转子腔。电子膨胀阀设有平衡通道将转子腔、小阀口和大阀口连通。这样实现了转子腔和小阀口、大阀口的压力平衡，也即实现了小阀针31及大阀针部32上下两侧的压力平衡，提高了电子膨胀阀的开关阀性能和可靠性。Optionally, in this embodiment, the electronic expansion valve also includes a valve sleeve, and the valve seat component 10 includes a valve seat ring and a base, and the valve sleeve, valve seat ring, and base are sequentially connected; the electronic expansion valve also includes a nut structure, and the nut structure Located inside the valve sleeve, the area between the nut structure and the inner wall of the valve sleeve forms a rotor cavity. The electronic expansion valve is provided with a balance channel to connect the rotor cavity, the small valve port and the large valve port. In this way, the pressure balance between the rotor cavity, the small valve port and the large valve port is realized, that is, the pressure balance between the upper and lower sides of the small valve needle 31 and the large valve needle part 32 is realized, and the opening and closing performance and reliability of the electronic expansion valve are improved. .

在本实施例中，平衡通道包括依次连通的第一通道、第二通道、第三通道和第四通道，其中，第一通道位于螺母结构内，第二通道位于阀座环内，第三通道位于连接套侧壁，第四通道位于小阀针31内，这样便实现了通过平衡通道将转子腔和小阀口、大阀口的连通，避免了转子腔和小阀口出现较大的压力差，避免了小阀针、大阀针部两端出现较大压力差，而导致关阀不良的问题。In this embodiment, the balance channel includes a first channel, a second channel, a third channel and a fourth channel connected in sequence, wherein the first channel is located in the nut structure, the second channel is located in the seat ring, and the third channel Located on the side wall of the connecting sleeve, the fourth channel is located in the small valve needle 31, which realizes the communication between the rotor cavity, the small valve port and the large valve port through the balance channel, and avoids a large pressure in the rotor cavity and the small valve port Poor, avoiding the large pressure difference between the two ends of the small valve needle and the large valve needle, which leads to the problem of poor valve closing.

如图4至图7所示，阀针部件30包括：第一压套70，设置在大阀针部32的腔体内，第一压套70和第一内密封圈37限位配合，以压住第一内密封圈37；第二压套80，第二压套80和大阀针部32固定连接，第二压套80和第一压套70背离第一内密封圈37的一侧抵接。As shown in Fig. 4 to Fig. 7, the valve needle part 30 includes: a first pressing sleeve 70, which is arranged in the cavity of the large valve needle part 32, and the first pressing sleeve 70 and the first inner sealing ring 37 are limitedly fitted to press Hold the first inner sealing ring 37; the second pressure sleeve 80, the second pressure sleeve 80 is fixedly connected with the large valve needle part 32, the second pressure sleeve 80 and the first pressure sleeve 70 abut against the side away from the first inner sealing ring 37 catch.

采用该方案，通过设置第一压套70和第一内密封圈37限位配合，以压住第一内密封圈37，从而实现了对第一内密封圈37的限位，并且设置第二压套80和第一压套70背离第一内密封圈37的一侧抵接，以压紧第一压套70，同时，第二压套80和大阀针部32固定连接，该连接方式稳定、可靠。在本方案中，通过第二压套80压住第一压套70，并且第二压套80和大阀针部32固定连接，随后通过第一压套70压紧第一内密封圈37，这样进一步避免了第一内密封圈37发生脱落，有效解决了由于长时间使用，而导致第一压套70松动、第一内密封圈37容易发生脱落的问题，同时也提高了阀针部件的使用寿命。With this solution, the first inner sealing ring 37 can be limited by setting the first pressure sleeve 70 and the first inner sealing ring 37 in position-limiting fit to press the first inner sealing ring 37, and the second inner sealing ring 37 can be limited. The pressure sleeve 80 and the first pressure sleeve 70 abut against the side away from the first inner sealing ring 37 to compress the first pressure sleeve 70. At the same time, the second pressure sleeve 80 is fixedly connected to the large valve needle part 32. This connection method Stable and reliable. In this solution, the first pressure sleeve 70 is pressed by the second pressure sleeve 80, and the second pressure sleeve 80 is fixedly connected with the large valve needle part 32, and then the first inner sealing ring 37 is compressed by the first pressure sleeve 70, This further prevents the first inner sealing ring 37 from falling off, effectively solves the problem that the first pressure sleeve 70 is loose and the first inner sealing ring 37 is prone to falling off due to long-term use, and also improves the safety of the valve needle parts. service life.

具体地，第二压套80和大阀针部32的端面焊接，这样连接可靠，第二压套80和第一压套70不会松动。而且，第二压套80离第一内密封圈37比较远，焊接热量不会使第一内密封圈37变形。 Specifically, the end faces of the second pressure sleeve 80 and the large valve needle portion 32 are welded, so that the connection is reliable, and the second pressure sleeve 80 and the first pressure sleeve 70 will not become loose. Moreover, the second pressing sleeve 80 is relatively far away from the first inner sealing ring 37 , and the welding heat will not deform the first inner sealing ring 37 .

其中，大阀针部32的内壁具有阶梯设置的第一环形台阶11和第二环形台阶12，第一内密封圈37设置在第一环形台阶11内，第一压套70设置在第二环形台阶12内，第二压套80的一部分穿入第二环形台阶12内。通过设置的第一环形台阶11，便于放置第一内密封圈37，且能够在周向上起到限位作用；设置第二环形台阶12，便于放置第一压套70，以压紧第一内密封圈37。其中，将第二压套80的一部分穿入第二环形台阶12内，用于和第一压套70进行抵接，以压紧第一压套70。Wherein, the inner wall of the large valve needle portion 32 has a stepped first annular step 11 and a second annular step 12, the first inner sealing ring 37 is arranged in the first annular step 11, and the first pressure sleeve 70 is arranged in the second annular step. In the step 12 , a part of the second pressing sleeve 80 penetrates into the second annular step 12 . The first annular step 11 is provided to facilitate the placement of the first inner sealing ring 37, and can play a limiting role in the circumferential direction; the second annular step 12 is provided to facilitate the placement of the first compression sleeve 70 to compress the first inner sealing ring. Seal ring 37. Wherein, a part of the second compression sleeve 80 is inserted into the second annular step 12 for abutting against the first compression sleeve 70 to compress the first compression sleeve 70 .

具体地，第二压套80包括依次连接的第一圆筒段41、过渡段42和第二圆筒段43，第一圆筒段41的外径大于第二圆筒段43的外径，第二圆筒段43的一部分穿入大阀针部32的腔体中，第二圆筒段43和第一压套70抵接，第二圆筒段43的外壁和大阀针部32的端面焊接。将第二圆筒段43的至少一部分穿入大阀针部32的腔体中，且第二圆筒段43和第一压套70抵接，这样保证了第一压套70能够压紧第一内密封圈37；将第二圆筒段43的外壁和大阀针部32的端面交接处焊接，这样保证了焊接时产生的热量不会导致第一内密封圈37发生变形，从而影响第一内密封圈37的密封效果。Specifically, the second compression sleeve 80 includes a first cylindrical section 41, a transition section 42 and a second cylindrical section 43 connected in sequence, the outer diameter of the first cylindrical section 41 is greater than the outer diameter of the second cylindrical section 43, A part of the second cylindrical section 43 penetrates into the cavity of the large valve needle part 32 , the second cylindrical section 43 abuts against the first pressing sleeve 70 , the outer wall of the second cylindrical section 43 and the outer wall of the large valve needle part 32 End welded. At least a part of the second cylindrical section 43 is inserted into the cavity of the large valve needle part 32, and the second cylindrical section 43 abuts against the first compression sleeve 70, thus ensuring that the first compression sleeve 70 can compress the first compression sleeve 70. An inner sealing ring 37; weld the outer wall of the second cylindrical section 43 and the end face of the large valve needle part 32 to weld, thus ensuring that the heat generated during welding will not cause deformation of the first inner sealing ring 37, thereby affecting the first inner sealing ring 37 A sealing effect of the inner sealing ring 37.

可选地，第二圆筒段43朝向第一压套70的一端设有倒角或圆角，这样便于第二圆筒段43穿入大阀针部32的腔体中。Optionally, the end of the second cylindrical section 43 facing the first pressure sleeve 70 is provided with a chamfer or rounded corner, which facilitates the second cylindrical section 43 to penetrate into the cavity of the large valve needle part 32 .

在本实施例中，第一压套70为环形板，第一压套70的内径大于第一内密封圈37的内径。将第一压套70设置为环形板，用于匹配第二环形台阶12的形状，便于安装；将第一压套70的内径设置成大于第一内密封圈37的内径，这样不会对穿入第一内密封圈37的阀针等配合件产生影响。In this embodiment, the first pressing sleeve 70 is an annular plate, and the inner diameter of the first pressing sleeve 70 is larger than the inner diameter of the first inner sealing ring 37 . The first pressure sleeve 70 is set as an annular plate, which is used to match the shape of the second annular step 12 for easy installation; the inner diameter of the first pressure sleeve 70 is set to be larger than the inner diameter of the first inner sealing ring 37, so that it will not wear The fittings such as the valve pin entering the first inner sealing ring 37 will have an impact.

其中，第一内密封圈37位于导向孔321和第一压套70之间，导向孔321、第一内密封圈37和环形板同轴设置，导向孔321的直径等于环形板的内径。将导向孔321、第一内密封圈37和环形板同轴设置，这样便于装配阀针和对阀针进行密封。Wherein, the first inner sealing ring 37 is located between the guide hole 321 and the first compression sleeve 70, the guide hole 321, the first inner sealing ring 37 and the ring plate are arranged coaxially, and the diameter of the guide hole 321 is equal to the inner diameter of the ring plate. The guide hole 321, the first inner sealing ring 37 and the annular plate are arranged coaxially, which is convenient for assembling and sealing the valve needle.

具体地，第二压套80的外侧壁具有密封槽44，阀针部件还包括第二内密封圈38，第二内密封圈38设置在密封槽44内。通过设置密封槽44，便于放置第二内密封圈38；设置第二内密封圈38，用于提高阀针部件的密封效果。Specifically, the outer wall of the second pressing sleeve 80 has a sealing groove 44 , and the valve needle component further includes a second inner sealing ring 38 , and the second inner sealing ring 38 is disposed in the sealing groove 44 . By providing the sealing groove 44, it is convenient to place the second inner sealing ring 38; the second inner sealing ring 38 is provided to improve the sealing effect of the valve needle component.

其中，小阀针31包括相互连接的限位杆71和封堵杆72，限位杆71的径向尺寸大于封堵杆72的径向尺寸，封堵杆72穿过第一内密封圈37并和小阀口331配合，限位杆71位于第二压套80的腔体内，限位杆71在轴向的一侧和第一压套70止挡配合，限位杆71在轴向的另一侧和第二压套80止挡配合。将限位杆71的径向尺寸设置成大于封堵杆72的径向尺寸，且限位杆71在轴向的一侧和第一压套70止挡配合，限位杆71在轴向的另一侧和第二压套80止挡配合，这样设置，能够当小阀针31在移动时起到限位作用，从而限定小阀针31的移动范围。并且，如此设置，在大阀针部32可移动的情况下，小阀针31可带动大阀针部32移动。Wherein, the small valve needle 31 includes a limiting rod 71 and a blocking rod 72 connected to each other, the radial dimension of the limiting rod 71 is larger than that of the blocking rod 72, and the blocking rod 72 passes through the first inner sealing ring 37 And cooperate with the small valve port 331, the limit rod 71 is located in the cavity of the second pressure sleeve 80, the limit rod 71 is matched with the first pressure sleeve 70 on the axial side, and the limit rod 71 is in the axial direction. The other side and the second pressing sleeve 80 stop fit. The radial dimension of the limiting rod 71 is set to be larger than the radial dimension of the blocking rod 72, and the limiting rod 71 is matched with the first compression sleeve 70 on one side in the axial direction, and the limiting rod 71 is in the axial direction. The other side cooperates with the stopper of the second pressure sleeve 80 , so that the small valve needle 31 can play a limiting role when the small valve needle 31 is moving, thereby limiting the moving range of the small valve needle 31 . Moreover, with such arrangement, when the large valve needle portion 32 is movable, the small valve needle 31 can drive the large valve needle portion 32 to move.

如图8至图10所示，阀座部件10包括：底座17，底座17的侧壁具有第一流通孔13，底座17的底壁具有第二流通孔14；阀座环90，阀座环90和底座17的一端焊接，阀座环90 和底座17的配合处的外周面具有环形避让槽91，阀座环90和底座17的焊接位置位于环形避让槽91内。As shown in Figures 8 to 10, the valve seat component 10 includes: a base 17, the side wall of the base 17 has a first flow hole 13, and the bottom wall of the base 17 has a second flow hole 14; a valve seat ring 90, a valve seat ring 90 and one end of the base 17 are welded, the seat ring 90 The outer peripheral surface of the joint with the base 17 has an annular avoidance groove 91 , and the welding position of the valve seat ring 90 and the base 17 is located in the annular avoidance groove 91 .

采用该方案，摒弃了现有技术中将第一流通孔13设置在阀座环90上的方案，而是将第一流通孔13设置在底座17的侧壁上，这样进一步降低了阀座环90的加工难度，从而减少了生产成本；并且在阀座环90和底座17的配合处的外周面设置有环形避让槽91，且阀座环90和底座17的焊接位置位于环形避让槽91内，这样使得阀座环90和底座17焊接后所形成的焊接面位于环形避让槽91中，从而避免了焊接后形成的焊接面对电子膨胀阀的装配造成影响。该电子膨胀阀可安装到安装基台或阀体内使用。With this solution, the solution of setting the first flow hole 13 on the seat ring 90 in the prior art is abandoned, but the first flow hole 13 is set on the side wall of the base 17, which further reduces the valve seat ring. 90 processing difficulty, thereby reducing production costs; and an annular avoidance groove 91 is provided on the outer peripheral surface of the seat ring 90 and the base 17, and the welding position of the valve seat ring 90 and the base 17 is located in the annular avoidance groove 91 , so that the welding surface formed after welding the seat ring 90 and the base 17 is located in the annular avoidance groove 91, thereby avoiding the influence of the welding surface formed after welding on the assembly of the electronic expansion valve. The electronic expansion valve can be installed on the installation base or in the valve body.

具体地，第一流通孔13为多个，多个第一流通孔13分布在底座17的周向。Specifically, there are a plurality of first circulation holes 13 , and the plurality of first circulation holes 13 are distributed in the circumferential direction of the base 17 .

其中，底座17的外周面具有第三环形台阶15，阀座环90的外周面具有第四环形台阶92，第三环形台阶15和第四环形台阶92形成环形避让槽91。通过第三环形台阶15和第四环形台阶92的设置，当底座17和阀座环90装配后，即形成了环形避让槽91，通过设置环形避让槽91，这样使得阀座环90和底座17焊接后所形成的不平整的焊接面位于环形避让槽91中，从而避免了焊接后形成的焊接面对电子膨胀阀的装配造成影响。Wherein, the outer peripheral surface of the base 17 has a third annular step 15 , the outer peripheral surface of the valve seat ring 90 has a fourth annular step 92 , and the third annular step 15 and the fourth annular step 92 form an annular relief groove 91 . Through the setting of the third annular step 15 and the fourth annular step 92, when the seat 17 and the seat ring 90 are assembled, an annular relief groove 91 is formed. By setting the annular relief groove 91, the seat ring 90 and the seat 17 The uneven welding surface formed after welding is located in the annular avoidance groove 91 , thereby avoiding the influence of the welding surface formed after welding on the assembly of the electronic expansion valve.

具体地，阀座环90具有第五环形台阶22，阀座环90的一部分穿入底座17的腔体内，底座17的端面和内壁均和第五环形台阶22限位配合。设置第五环形台阶22，当阀座环90穿入底座17的腔体内时，能够起到限位作用，从而限定了阀座环90的***深度。Specifically, the seat ring 90 has a fifth annular step 22 , a part of the seat ring 90 penetrates into the cavity of the base 17 , and the end surface and the inner wall of the base 17 are limitedly fitted with the fifth annular step 22 . The fifth annular step 22 is provided to limit the insertion depth of the seat ring 90 when the seat ring 90 penetrates into the cavity of the base 17 .

在本实施例中，底座17的外壁具有用于安装密封圈的第一容纳槽16，阀座环90的外壁具有用于安装密封圈的第二容纳槽93，第一流通孔13位于第一容纳槽16和第二容纳槽93之间。通过在底座17的外壁设置第一容纳槽16，便于放置密封圈，从而提高了电子膨胀阀的密封效果；在阀座环90的外壁设置第二容纳槽93，便于放置密封圈，进一步提高了电子膨胀阀的密封效果；将第一流通孔13设置在第一容纳槽16和第二容纳槽93之间，通过密封圈的作用，能够有效防止流体的发生泄漏。In this embodiment, the outer wall of the base 17 has a first accommodating groove 16 for installing a sealing ring, the outer wall of the seat ring 90 has a second accommodating groove 93 for installing a sealing ring, and the first flow hole 13 is located at the first Between the receiving groove 16 and the second receiving groove 93 . By setting the first accommodation groove 16 on the outer wall of the base 17, it is convenient to place the sealing ring, thereby improving the sealing effect of the electronic expansion valve; on the outer wall of the valve seat ring 90, the second accommodation groove 93 is arranged to facilitate the placement of the sealing ring, which further improves the performance of the electronic expansion valve. The sealing effect of the electronic expansion valve: the first flow hole 13 is arranged between the first accommodation groove 16 and the second accommodation groove 93 , through the function of the sealing ring, the leakage of fluid can be effectively prevented.

具体地，阀座环90的外壁具有用于与外部结构连接的外螺纹，和/或阀座环90具有用于与安装工具配合的操作孔24。通过在阀座环90的外壁设置外螺纹，这样便于和外部结构进行可拆卸连接，提高了电子膨胀阀的通用性。操作孔24中可伸入安装工具以拧紧或松开电子膨胀阀。Specifically, the outer wall of the valve seat ring 90 has an external thread for connecting with an external structure, and/or the valve seat ring 90 has an operation hole 24 for cooperating with an installation tool. By providing an external thread on the outer wall of the valve seat ring 90, it is convenient for detachable connection with the external structure and improves the versatility of the electronic expansion valve. An installation tool can be inserted into the operation hole 24 to tighten or loosen the electronic expansion valve.

如图8所示，电子膨胀阀还包括阀套100，阀座环90远离底座17的一端穿入阀套100内并与阀套100焊接。通过将阀座环90远离底座17的一端穿入阀套100内并与阀套100焊接，这样能够防止外界因素对电子膨胀阀的内部结构产生影响。其中，采用焊接的连接方式，稳定、可靠。As shown in FIG. 8 , the electronic expansion valve further includes a valve sleeve 100 , and the end of the valve seat ring 90 away from the base 17 penetrates into the valve sleeve 100 and is welded with the valve sleeve 100 . By inserting the end of the seat ring 90 away from the base 17 into the valve sleeve 100 and welding it with the valve sleeve 100, external factors can be prevented from affecting the internal structure of the electronic expansion valve. Among them, the welding connection method is adopted, which is stable and reliable.

具体地，阀座环90包括依次连接的第一筒段94、第二筒段95、第三筒段96、连接段97和导向段98，第二筒段95的外径大于第一筒段94、第三筒段96、连接段97的外径，连接段97的外径大于导向段98的外径，导向段98穿入底座17中，连接段97和底座17焊接，第三 筒段96的外壁具有用于安装密封圈的第二容纳槽93，第二筒段95的外壁具有外螺纹。采用上述设置方式，设置连接段97，便于和底座17进行焊接；设置导向段98，且将导向段98穿入底座17中，这样在装配时，能够对阀座环90起到导向作用；在第三筒段96的外壁设置第二容纳槽93，便于放置密封垫，提高密封效果；在第二筒段95的外壁设置有外螺纹，便于和外部结构进行可拆卸连接，提高了电子膨胀阀的通用性。可选地，第三筒段96的外径等于底座17的外径。Specifically, the valve seat ring 90 includes a first barrel section 94, a second barrel section 95, a third barrel section 96, a connecting section 97 and a guide section 98 connected in sequence, and the outer diameter of the second barrel section 95 is larger than that of the first barrel section. 94, the outer diameter of the third barrel section 96 and the connecting section 97, the outer diameter of the connecting section 97 is greater than the outer diameter of the guide section 98, the guide section 98 penetrates the base 17, the connecting section 97 and the base 17 are welded, the third The outer wall of the cylinder section 96 has a second receiving groove 93 for installing the sealing ring, and the outer wall of the second cylinder section 95 has an external thread. Using the above-mentioned setting method, a connecting section 97 is provided to facilitate welding with the base 17; a guide section 98 is provided, and the guide section 98 is inserted into the base 17, so that the valve seat ring 90 can be guided during assembly; The outer wall of the third barrel section 96 is provided with a second receiving groove 93, which is convenient for placing the gasket and improving the sealing effect; the outer wall of the second barrel section 95 is provided with external threads, which is convenient for detachable connection with the external structure and improves the electronic expansion valve. versatility. Optionally, the outer diameter of the third barrel section 96 is equal to the outer diameter of the base 17 .

如图11至图13所示，大密封垫20的外侧具有第六环形台阶23，加强密封圈40设置在第六环形台阶23内，加强密封圈40和阀座部件10腔体的内侧面、底面均抵接。通过设置第六环形台阶23，便于放置加强密封圈40；将加强密封圈40和阀座部件10腔体的内侧面、底面均抵接，这样设置，能够有效保证大密封垫20的密封效果，防止了大密封垫20长时间使用变形后和阀座部件10发生流体泄露。As shown in Figures 11 to 13, the outer side of the large sealing gasket 20 has a sixth annular step 23, and the reinforced sealing ring 40 is arranged in the sixth annular step 23, and the inner surface of the reinforced sealing ring 40 and the cavity of the valve seat member 10, Bottoms are all abutted. By setting the sixth annular step 23, it is convenient to place the reinforced sealing ring 40; the inner surface and the bottom surface of the reinforced sealing ring 40 and the valve seat member 10 cavity are all abutted, so that the sealing effect of the large sealing gasket 20 can be effectively guaranteed, This prevents fluid leakage from the valve seat part 10 after the deformation of the large sealing gasket 20 for a long time.

其中，大限位结构50包括相互连接的压紧环51和连接环52，压紧环51和大密封垫20抵接，连接环52位于压紧环51背离大密封垫20的一侧，连接环52和阀座部件10的内壁焊接。通过设置压紧环51，便于和大密封垫20抵接，以压紧大密封垫20；将连接环52设置在位于压紧环51背离大密封垫20的一侧，这样便于和阀座部件10的内壁进行焊接，保证了大密封垫20不会发生脱落，同时也能够远离大密封垫20和加强密封圈40，防止焊接时的热量过高，而造成大密封垫20和加强密封圈40因受热发生变形。Wherein, the large limit structure 50 includes a compression ring 51 and a connecting ring 52 connected to each other, the compression ring 51 abuts against the large gasket 20, the connection ring 52 is located on the side of the compression ring 51 away from the large gasket 20, and the connection The ring 52 is welded to the inner wall of the valve seat member 10 . By setting the compression ring 51, it is convenient to abut against the large gasket 20 to compress the large gasket 20; the connecting ring 52 is arranged on the side where the compression ring 51 is away from the large gasket 20, so that it is convenient to the valve seat part The inner wall of 10 is welded to ensure that the large sealing gasket 20 will not fall off, and at the same time, it can be far away from the large sealing gasket 20 and the reinforced sealing ring 40, so as to prevent the excessive heat during welding from causing the large sealing gasket 20 and the reinforced sealing ring 40 Deformation due to heat.

具体地，大密封垫20的外侧具有第七环形台阶25，大限位结构50和第七环形台阶25限位配合。通过设置第七环形台阶25，便于和大限位结构50进行限位配合，以限定大限位结构50的移动范围，其中，压紧环51和第七环形台阶25限位配合。Specifically, the outer side of the large sealing gasket 20 has a seventh annular step 25 , and the large limiting structure 50 and the seventh annular step 25 are limitedly fitted. By setting the seventh annular step 25 , it is convenient to carry out limit cooperation with the large limit structure 50 to limit the movement range of the large limit structure 50 , wherein the pressing ring 51 and the seventh annular step 25 are limit fit.

在本实施例中，加强密封圈40由软质材料制成。这样能够提高加强密封圈40的密封效果。其中，加强密封圈40的材质为塑料或橡胶。In this embodiment, the reinforcing sealing ring 40 is made of soft material. In this way, the sealing effect of the reinforced sealing ring 40 can be improved. Wherein, the reinforced sealing ring 40 is made of plastic or rubber.

其中，大阀针部32为中空结构，大阀针部32的端部具有用于和大密封垫20密封配合的密封面411，密封面411为弧形面。通过在大阀针部32的端部设置和大密封垫20密封配合的密封面411，这样接触面积大，便于和大密封垫20密封配合，并且这样能够实现最大的流通面积，从而提高了电子膨胀阀的流量。Wherein, the large valve needle portion 32 is a hollow structure, and the end of the large valve needle portion 32 has a sealing surface 411 for sealingly fitting with the large sealing gasket 20 , and the sealing surface 411 is an arc-shaped surface. By setting the sealing surface 411 at the end of the large valve needle part 32 and the large sealing gasket 20, the contact area is large, which is convenient for sealing and matching with the large sealing gasket 20, and in this way the largest flow area can be realized, thereby improving the electronic performance. The flow rate of the expansion valve.

如图14和图15所示，大阀针部32具有和限位槽322连通的放置槽212，放置槽212的径向尺寸大于限位槽322的径向尺寸，小限位结构60位于放置槽212内。通过设置放置槽212，便于放置小限位结构60；且放置槽212的径向尺寸设置大于限位槽322的径向尺寸，这样在装配时，便于将小密封垫33放置在限位槽322内，随后放置小限位结构60将小密封垫33压紧。As shown in Figure 14 and Figure 15, the large valve needle portion 32 has a placement groove 212 communicating with the limiting groove 322, the radial dimension of the placing groove 212 is larger than the radial dimension of the limiting groove 322, and the small limiting structure 60 is positioned Inside the groove 212. By setting the placement groove 212, it is convenient to place the small limiting structure 60; and the radial dimension of the placement groove 212 is set larger than the radial dimension of the limiting groove 322, so that when assembling, it is convenient to place the small sealing gasket 33 in the limiting groove 322 Then place a small stop structure 60 to compress the small gasket 33.

其中，小限位结构60为环形结构，小限位结构60的外侧壁和放置槽212的内侧壁焊接，小限位结构60和小阀口331同轴设置，小限位结构60的内径大于等于小阀口331的最小径向尺寸。将小限位结构60设置为环形结构，这样能够匹配放置槽212的形状，便于装配；将小限位结构60的外侧壁和放置槽212的内侧壁焊接，进一步保证了小密封垫33不会发生脱 落，采用焊接的连接方式，稳定、可靠；将小限位结构60和小阀口331同轴设置，小限位结构60的内径设置成大于等于小阀口331的最小径向尺寸，这样便于装配小阀针31和对小阀口331进行密封。Wherein, the small limiting structure 60 is an annular structure, the outer wall of the small limiting structure 60 is welded to the inner wall of the placement groove 212, the small limiting structure 60 and the small valve port 331 are coaxially arranged, and the inner diameter of the small limiting structure 60 is larger than It is equal to the smallest radial dimension of the small valve port 331 . The small limiting structure 60 is arranged as an annular structure, which can match the shape of the placement groove 212 and is convenient for assembly; the outer sidewall of the small limiting structure 60 and the inner sidewall of the placement groove 212 are welded to further ensure that the small gasket 33 will not take off The connection method is welded, which is stable and reliable; the small limit structure 60 and the small valve port 331 are coaxially arranged, and the inner diameter of the small limit structure 60 is set to be greater than or equal to the minimum radial dimension of the small valve port 331, which is convenient Assemble the small valve needle 31 and seal the small valve port 331 .

具体地，小阀口331开口大的一端背离小限位结构60。小阀口331开口大的一端背离小限位结构60，这样在小阀针31和小阀口331的配合下，能够更精确地实现流量调节，满足使用要求。Specifically, the large opening end of the small valve port 331 is away from the small limiting structure 60 . The end of the small valve port 331 with a large opening is away from the small limit structure 60, so that with the cooperation of the small valve needle 31 and the small valve port 331, the flow adjustment can be more accurately realized to meet the use requirements.

具体地，大阀针部32具有侧开孔213，侧开孔213位于小密封垫33背离小限位结构60的一侧，小阀口331打开的情况下，小阀口331通过侧开孔213和第一流通孔13连通。采用上述设置方式，在大阀针部32设置有侧开孔213，当小阀口331处在打开的情况下时，流体通过侧开孔213进入第一流通孔13中，实现了小流量的通断功能。而且，侧开孔213位于小密封垫33背离小限位结构60的一侧，这样可避免侧开孔213和小限位结构60干涉，使阀针部件30结构紧凑。Specifically, the large valve needle part 32 has a side opening 213, and the side opening 213 is located on the side of the small sealing gasket 33 away from the small limiting structure 60. When the small valve port 331 is opened, the small valve port 331 passes through the side opening. 213 communicates with the first flow hole 13 . With the above arrangement, the large valve needle part 32 is provided with a side opening 213. When the small valve port 331 is open, the fluid enters the first flow hole 13 through the side opening 213, realizing the small flow rate. On-off function. Moreover, the side opening 213 is located on the side of the small sealing gasket 33 away from the small limiting structure 60 , so that the interference between the side opening 213 and the small limiting structure 60 can be avoided, and the valve needle component 30 has a compact structure.

以上仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。 The above are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, there may be various modifications and changes in the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims (31)

1. 一种电子膨胀阀，其特征在于，包括：An electronic expansion valve, characterized in that it comprises:

   阀座部件(10)；Seat part (10);

   大密封垫(20)，设置在所述阀座部件(10)的腔体内，所述大密封垫(20)具有大阀口(21)，所述大密封垫(20)由软质材料制成；A large sealing pad (20), arranged in the cavity of the valve seat part (10), the large sealing pad (20) has a large valve port (21), and the large sealing pad (20) is made of soft material become;

   阀针部件(30)，设置在所述阀座部件(10)的腔体内，所述阀针部件(30)包括小阀针(31)、大阀针部(32)和小密封垫(33)，所述小密封垫(33)设置在所述大阀针部(32)内，所述小密封垫(33)具有小阀口(331)，所述小密封垫(33)由软质材料制成；其中，所述大阀针部(32)用于和所述大密封垫(20)配合以开闭所述大阀口(21)，所述小阀针(31)用于和所述小密封垫(33)配合以调整所述小阀口(331)的开度。A valve needle part (30), which is arranged in the cavity of the valve seat part (10), and the valve needle part (30) includes a small valve needle (31), a large valve needle part (32) and a small sealing gasket (33 ), the small gasket (33) is arranged in the large valve needle part (32), the small gasket (33) has a small valve port (331), and the small gasket (33) is made of soft material; wherein, the large valve needle part (32) is used to cooperate with the large sealing gasket (20) to open and close the large valve port (21), and the small valve needle (31) is used to cooperate with the The small sealing gasket (33) cooperates to adjust the opening degree of the small valve port (331).
2. 根据权利要求1所述的电子膨胀阀，其特征在于，所述小阀口(331)为锥形结构，所述小阀口(331)开口小的一端朝向所述大阀口(21)。The electronic expansion valve according to claim 1, characterized in that, the small valve port (331) is a tapered structure, and the small opening end of the small valve port (331) faces the large valve port (21).
3. 根据权利要求1所述的电子膨胀阀，其特征在于，所述大阀口(21)的端面为密封平面(211)，所述大阀针部(32)的一端和所述密封平面(211)抵接的情况下，所述大阀口(21)关闭。The electronic expansion valve according to claim 1, characterized in that, the end face of the large valve port (21) is a sealing plane (211), and one end of the large valve needle portion (32) and the sealing plane (211 ) contact, the large valve port (21) is closed.
4. 根据权利要求1所述的电子膨胀阀，其特征在于，所述小密封垫(33)的材质为塑料或橡胶，所述大密封垫(20)的材质为塑料或橡胶。The electronic expansion valve according to claim 1, characterized in that, the material of the small sealing gasket (33) is plastic or rubber, and the material of the large sealing gasket (20) is plastic or rubber.
5. 根据权利要求1所述的电子膨胀阀，其特征在于，所述大阀针部(32)具有导向孔(321)，所述导向孔(321)位于所述小阀口(331)背离所述大阀口(21)的一侧，所述小阀针(31)可轴向移动地穿过所述导向孔(321)；所述阀针部件(30)还包括第一内密封圈(37)，所述第一内密封圈(37)位于所述小阀针(31)的外壁和所述导向孔(321)的内壁之间。The electronic expansion valve according to claim 1, characterized in that, the large valve needle portion (32) has a guide hole (321), and the guide hole (321) is located at the small valve port (331) away from the One side of the large valve port (21), the small valve needle (31) can axially move through the guide hole (321); the valve needle part (30) also includes a first inner sealing ring (37 ), the first inner sealing ring (37) is located between the outer wall of the small valve needle (31) and the inner wall of the guide hole (321).
6. 根据权利要求1所述的电子膨胀阀，其特征在于，所述大阀针部(32)可轴向移动地设置在所述阀座部件(10)的腔体内，所述阀针部件(30)还包括第二内密封圈(38)，所述第二内密封圈(38)设置在所述阀座部件(10)的内壁和所述大阀针部(32)的外壁之间。The electronic expansion valve according to claim 1, characterized in that, the large valve needle part (32) is arranged axially movable in the cavity of the valve seat part (10), and the valve needle part (30 ) further includes a second inner sealing ring (38), the second inner sealing ring (38) is arranged between the inner wall of the valve seat part (10) and the outer wall of the large valve needle part (32).
7. 根据权利要求1所述的电子膨胀阀，其特征在于，所述阀针部件(30)还包括驱动组件(34)，所述驱动组件(34)包括螺杆(341)和连接套(342)，所述连接套(342)的一端和所述小阀针(31)连接，所述螺杆(341)和所述连接套(342)在轴向限位配合，所述螺杆(341)可轴向移动地设置，以带动所述小阀针(31)移动。The electronic expansion valve according to claim 1, characterized in that, the valve needle part (30) further includes a drive assembly (34), and the drive assembly (34) includes a screw rod (341) and a connecting sleeve (342), One end of the connecting sleeve (342) is connected to the small valve needle (31), the screw rod (341) and the connecting sleeve (342) are axially limited, and the screw rod (341) can be axially It is set to move, so as to drive the small valve needle (31) to move.
8. 根据权利要求7所述的电子膨胀阀，其特征在于，所述驱动组件(34)还包括设置在所述连接套(342)内的滚动结构(343)，所述连接套(342)和所述螺杆(341)分别和所述滚动结构(343)配合，以使所述连接套(342)不随所述螺杆(341)转动。 The electronic expansion valve according to claim 7, characterized in that, the driving assembly (34) further comprises a rolling structure (343) arranged in the connecting sleeve (342), and the connecting sleeve (342) and the The screw rods (341) cooperate with the rolling structures (343) respectively, so that the connecting sleeve (342) does not rotate with the screw rods (341).
9. 根据权利要求8所述的电子膨胀阀，其特征在于，所述小阀针(31)远离所述小阀口(331)的一端穿入所述连接套(342)并和所述连接套(342)固定连接，所述滚动结构(343)为轴承，所述驱动组件(34)还包括设置在所述连接套(342)内的衬套(344)和弹性件(345)，所述轴承套在所述螺杆(341)的一端，所述轴承的一侧和所述连接套(342)在轴向限位配合，所述轴承的另一侧、所述衬套(344)、所述弹性件(345)和所述小阀针(31)依次抵接。The electronic expansion valve according to claim 8, characterized in that, the end of the small valve needle (31) away from the small valve port (331) penetrates the connecting sleeve (342) and connects with the connecting sleeve ( 342) is fixedly connected, the rolling structure (343) is a bearing, and the driving assembly (34) also includes a bushing (344) and an elastic member (345) arranged in the connecting sleeve (342), the bearing It is sleeved on one end of the screw (341), one side of the bearing and the connecting sleeve (342) are limited in the axial direction, and the other side of the bearing, the bush (344), the The elastic member (345) abuts against the small valve needle (31) in sequence.
10. 根据权利要求7所述的电子膨胀阀，其特征在于，所述阀针部件(30)内具有相对的第一止挡面(35)和第二止挡面(36)，所述第一止挡面(35)和所述第二止挡面(36)限定所述小阀针(31)的移动范围；所述螺杆(341)可在预设行程内带动所述小阀针(31)单独移动，且所述螺杆(341)可通过所述小阀针(31)带动所述大阀针部(32)移动。The electronic expansion valve according to claim 7, characterized in that, the needle member (30) has a first stop surface (35) and a second stop surface (36) opposite to each other, and the first stop surface The stop surface (35) and the second stop surface (36) limit the movement range of the small valve needle (31); the screw (341) can drive the small valve needle (31) within a preset stroke move independently, and the screw rod (341) can drive the large valve needle part (32) to move through the small valve needle (31).
11. 根据权利要求1所述的电子膨胀阀，其特征在于，所述电子膨胀阀还包括加强密封圈(40)，所述加强密封圈(40)设置在所述大密封垫(20)和所述阀座部件(10)的内壁之间。The electronic expansion valve according to claim 1, characterized in that, the electronic expansion valve further comprises a reinforced sealing ring (40), and the reinforced sealing ring (40) is arranged between the large sealing gasket (20) and the between the inner walls of the seat part (10).
12. 根据权利要求1所述的电子膨胀阀，其特征在于，所述电子膨胀阀还包括设置在所述阀座部件(10)的腔体内的大限位结构(50)，所述大限位结构(50)和所述大密封垫(20)朝向所述大阀针部(32)的一侧抵接，以压紧所述大密封垫(20)。The electronic expansion valve according to claim 1, characterized in that, the electronic expansion valve further comprises a large limit structure (50) arranged in the cavity of the valve seat part (10), and the large limit structure (50) abuts against the side of the large sealing pad (20) facing the large valve needle portion (32), so as to compress the large sealing pad (20).
13. 根据权利要求1所述的电子膨胀阀，其特征在于，所述电子膨胀阀还包括设置在所述大阀针部(32)内的小限位结构(60)，所述小限位结构(60)和所述小密封垫(33)背离所述小阀针(31)的一侧抵接。The electronic expansion valve according to claim 1, characterized in that the electronic expansion valve further comprises a small limit structure (60) arranged in the large valve needle portion (32), the small limit structure ( 60) abuts against the side of the small sealing gasket (33) away from the small valve needle (31).
14. 根据权利要求13所述的电子膨胀阀，其特征在于，所述大阀针部(32)具有限位槽(322)，所述限位槽(322)的开口朝向所述小限位结构(60)，所述小密封垫(33)的厚度大于所述限位槽(322)的深度，所述小限位结构(60)和所述小密封垫(33)凸出于所述限位槽(322)的一侧抵接。The electronic expansion valve according to claim 13, characterized in that, the large valve needle portion (32) has a limiting groove (322), and the opening of the limiting groove (322) faces the small limiting structure ( 60), the thickness of the small sealing gasket (33) is greater than the depth of the limiting groove (322), and the small limiting structure (60) and the small sealing gasket (33) protrude from the limiting One side of the slot (322) abuts.
15. 根据权利要求5所述的电子膨胀阀，其特征在于，所述阀针部件(30)包括：The electronic expansion valve according to claim 5, wherein the valve needle component (30) comprises:

    第一压套(70)，设置在所述大阀针部(32)的腔体内，所述第一压套(70)和所述第一内密封圈(37)限位配合，以压住所述第一内密封圈(37)；The first pressure sleeve (70) is arranged in the cavity of the large valve needle part (32). The first inner sealing ring (37);

    第二压套(80)，所述第二压套(80)和所述大阀针部(32)固定连接，所述第二压套(80)和所述第一压套(70)背离所述第一内密封圈(37)的一侧抵接。The second pressure sleeve (80), the second pressure sleeve (80) is fixedly connected with the large valve needle portion (32), the second pressure sleeve (80) is away from the first pressure sleeve (70) One side of the first inner sealing ring (37) abuts against.
16. 根据权利要求15所述的电子膨胀阀，其特征在于，所述大阀针部(32)的内壁具有阶梯设置的第一环形台阶(11)和第二环形台阶(12)，所述第一内密封圈(37)设置在所述第一环形台阶(11)内，所述第一压套(70)设置在所述第二环形台阶(12)内，所述第二压套(80)的一部分穿入所述第二环形台阶(12)内。The electronic expansion valve according to claim 15, characterized in that, the inner wall of the large valve needle portion (32) has a first annular step (11) and a second annular step (12) arranged stepwise, the first The inner sealing ring (37) is arranged in the first annular step (11), the first pressing sleeve (70) is arranged in the second annular step (12), and the second pressing sleeve (80) A part of it penetrates into the second annular step (12).
17. 根据权利要求15所述的电子膨胀阀，其特征在于，所述第二压套(80)包括依次连接的第一圆筒段(41)、过渡段(42)和第二圆筒段(43)，所述第一圆筒段(41)的外径大 于所述第二圆筒段(43)的外径，所述第二圆筒段(43)的至少一部分穿入所述大阀针部(32)的腔体中，所述第二圆筒段(43)和所述第一压套(70)抵接，所述第二圆筒段(43)的外壁和所述大阀针部(32)的端面交接处焊接。The electronic expansion valve according to claim 15, characterized in that, the second pressure sleeve (80) comprises a first cylindrical section (41), a transition section (42) and a second cylindrical section (43) connected in sequence ), the outer diameter of the first cylindrical section (41) is large On the outer diameter of the second cylinder section (43), at least a part of the second cylinder section (43) penetrates into the cavity of the large valve needle part (32), and the second cylinder The segment (43) abuts against the first pressure sleeve (70), and the outer wall of the second cylindrical segment (43) is welded at the junction of the end surface of the large valve needle portion (32).
18. 根据权利要求15所述的电子膨胀阀，其特征在于，所述第一压套(70)为环形板，所述第一压套(70)的内径大于所述第一内密封圈(37)的内径；所述第一内密封圈(37)位于所述导向孔(321)和所述第一压套(70)之间，所述导向孔(321)、所述第一内密封圈(37)和所述环形板同轴设置，所述导向孔(321)的直径等于所述环形板的内径；所述第二压套(80)的外侧壁具有密封槽(44)，所述阀针部件还包括第二内密封圈(38)，所述第二内密封圈(38)设置在所述密封槽(44)内。The electronic expansion valve according to claim 15, characterized in that, the first pressure sleeve (70) is an annular plate, and the inner diameter of the first pressure sleeve (70) is larger than that of the first inner sealing ring (37) The inner diameter of the first inner seal ring (37) is located between the guide hole (321) and the first pressure sleeve (70), the guide hole (321), the first inner seal ring ( 37) is arranged coaxially with the annular plate, the diameter of the guide hole (321) is equal to the inner diameter of the annular plate; the outer wall of the second pressure sleeve (80) has a sealing groove (44), and the valve The needle part also includes a second inner sealing ring (38), said second inner sealing ring (38) being arranged in said sealing groove (44).
19. 根据权利要求15所述的电子膨胀阀，其特征在于，所述小阀针(31)包括相互连接的限位杆(71)和封堵杆(72)，所述限位杆(71)的径向尺寸大于所述封堵杆(72)的径向尺寸，所述封堵杆(72)穿过所述第一内密封圈(37)并和所述小阀口(331)配合，所述限位杆(71)位于所述第二压套(80)的腔体内，所述限位杆(71)在轴向的一侧和所述第一压套(70)止挡配合，所述限位杆(71)在轴向的另一侧和所述第二压套(80)止挡配合。The electronic expansion valve according to claim 15, characterized in that, the small valve needle (31) includes a limit rod (71) and a blocking rod (72) connected to each other, and the limit rod (71) The radial dimension is larger than the radial dimension of the blocking rod (72), and the blocking rod (72) passes through the first inner sealing ring (37) and cooperates with the small valve port (331), so The limiting rod (71) is located in the cavity of the second pressing sleeve (80), and the limiting rod (71) is matched with the stopper of the first pressing sleeve (70) on one axial side, so The limit rod (71) is engaged with the stopper of the second pressure sleeve (80) on the other side in the axial direction.
20. 根据权利要求13所述的电子膨胀阀，其特征在于，所述阀座部件(10)包括：The electronic expansion valve according to claim 13, characterized in that, the valve seat part (10) comprises:

    底座(17)，所述底座(17)的侧壁具有第一流通孔(13)，所述底座(17)的底壁具有第二流通孔(14)；A base (17), the side wall of the base (17) has a first flow hole (13), and the bottom wall of the base (17) has a second flow hole (14);

    阀座环(90)，所述阀座环(90)和所述底座(17)的一端焊接，所述阀座环(90)和所述底座(17)的配合处的外周面具有环形避让槽(91)，所述阀座环(90)和所述底座(17)的焊接位置位于所述环形避让槽(91)内。Seat ring (90), one end of the seat ring (90) and the base (17) is welded, and the outer peripheral surface of the seat ring (90) and the base (17) has a ring relief Groove (91), the welding position of the valve seat ring (90) and the base (17) is located in the annular escape groove (91).
21. 根据权利要求20所述的电子膨胀阀，其特征在于，所述底座(17)的外周面具有第三环形台阶(15)，所述阀座环(90)的外周面具有第四环形台阶(92)，所述第三环形台阶(15)和所述第四环形台阶(92)形成所述环形避让槽(91)；所述阀座环(90)具有第五环形台阶(22)，所述阀座环(90)的一部分穿入所述底座(17)的腔体内，所述底座(17)的端面和内壁均和所述第五环形台阶(22)限位配合。The electronic expansion valve according to claim 20, characterized in that, the outer peripheral surface of the base (17) has a third annular step (15), and the outer peripheral surface of the valve seat ring (90) has a fourth annular step ( 92), the third annular step (15) and the fourth annular step (92) form the annular relief groove (91); the valve seat ring (90) has a fifth annular step (22), the A part of the valve seat ring (90) penetrates into the cavity of the base (17), and the end surface and the inner wall of the base (17) are limitedly fitted with the fifth annular step (22).
22. 根据权利要求20所述的电子膨胀阀，其特征在于，所述底座(17)的外壁具有用于安装密封圈的第一容纳槽(16)，所述阀座环(90)的外壁具有用于安装密封圈的第二容纳槽(93)，所述第一流通孔(13)位于所述第一容纳槽(16)和所述第二容纳槽(93)之间。The electronic expansion valve according to claim 20, characterized in that, the outer wall of the base (17) has a first accommodating groove (16) for installing a sealing ring, and the outer wall of the valve seat ring (90) has a The first flow hole (13) is located between the first accommodating groove (16) and the second accommodating groove (93) for installing the sealing ring.
23. 根据权利要求20所述的电子膨胀阀，其特征在于，所述阀座环(90)的外壁具有用于与外部结构连接的外螺纹，和/或所述阀座环(90)具有用于与安装工具配合的操作孔(24)；所述电子膨胀阀还包括阀套(100)，所述阀座环(90)远离所述底座(17)的一端穿入所述阀套(100)内并与所述阀套(100)焊接。 The electronic expansion valve according to claim 20, characterized in that, the outer wall of the valve seat ring (90) has external threads for connecting with an external structure, and/or the valve seat ring (90) has external threads for An operation hole (24) matched with an installation tool; the electronic expansion valve also includes a valve sleeve (100), and the end of the valve seat ring (90) away from the base (17) penetrates into the valve sleeve (100) and welded with the valve sleeve (100).
24. 根据权利要求20所述的电子膨胀阀，其特征在于，所述阀座环(90)包括依次连接的第一筒段(94)、第二筒段(95)、第三筒段(96)、连接段(97)和导向段(98)，所述第二筒段(95)的外径大于所述第一筒段(94)、所述第三筒段(96)、所述连接段(97)的外径，所述连接段(97)的外径大于所述导向段(98)的外径，所述导向段(98)穿入所述底座(17)中，所述连接段(97)和所述底座(17)焊接，所述第三筒段(96)的外壁具有用于安装密封圈的第二容纳槽(93)，所述第二筒段(95)的外壁具有外螺纹。The electronic expansion valve according to claim 20, characterized in that, the valve seat ring (90) comprises a first cylinder section (94), a second cylinder section (95), and a third cylinder section (96) connected in sequence , connection section (97) and guide section (98), the outer diameter of described second cylinder section (95) is larger than described first cylinder section (94), described third cylinder section (96), described connection section (97), the outer diameter of the connecting section (97) is greater than the outer diameter of the guide section (98), and the guide section (98) penetrates into the base (17), and the connecting section (97) is welded to the base (17), the outer wall of the third barrel section (96) has a second receiving groove (93) for installing a sealing ring, and the outer wall of the second barrel section (95) has a external thread.
25. 根据权利要求11所述的电子膨胀阀，其特征在于，所述大密封垫(20)的外侧具有第六环形台阶(23)，所述加强密封圈(40)设置在所述第六环形台阶(23)内，所述加强密封圈(40)和所述阀座部件(10)腔体的内侧面、底面均抵接；或所述大密封垫(20)的外侧具有环形槽，所述加强密封圈(40)设置在所述环形槽内，所述加强密封圈(40)和所述阀座部件(10)腔体的内侧面抵接。The electronic expansion valve according to claim 11, characterized in that there is a sixth annular step (23) on the outside of the large sealing pad (20), and the reinforcing sealing ring (40) is arranged on the sixth annular step (23), the inner surface and the bottom surface of the cavity of the reinforced sealing ring (40) and the valve seat part (10) are all abutted; or the outer side of the large sealing gasket (20) has an annular groove, and the A reinforced sealing ring (40) is arranged in the annular groove, and the reinforced sealing ring (40) abuts against the inner surface of the cavity of the valve seat part (10).
26. 根据权利要求12所述的电子膨胀阀，其特征在于，所述大限位结构(50)包括相互连接的压紧环(51)和连接环(52)，所述压紧环(51)和所述大密封垫(20)抵接，所述连接环(52)位于所述压紧环(51)背离所述大密封垫(20)的一侧，所述连接环(52)和所述阀座部件(10)的内壁焊接；所述大限位结构(50)朝向所述大密封垫(20)的一端的外侧壁具有倒角或圆角；所述大密封垫(20)的外侧具有第七环形台阶(25)，所述大限位结构(50)和所述第七环形台阶(25)限位配合。The electronic expansion valve according to claim 12, characterized in that, the large limit structure (50) comprises a compression ring (51) and a connecting ring (52) connected to each other, the compression ring (51) and The large sealing gasket (20) abuts, the connecting ring (52) is located on the side of the pressing ring (51) away from the large sealing gasket (20), the connecting ring (52) and the The inner wall of the valve seat part (10) is welded; the outer wall of the large limit structure (50) towards the end of the large gasket (20) has a chamfer or fillet; the outer side of the large gasket (20) There is a seventh annular step (25), and the large limiting structure (50) is limitedly matched with the seventh annular step (25).
27. 根据权利要求11所述的电子膨胀阀，其特征在于，所述加强密封圈(40)由软质材料制成，所述加强密封圈(40)的外径大于所述大密封垫(20)的外径。The electronic expansion valve according to claim 11, characterized in that, the reinforced sealing ring (40) is made of soft material, and the outer diameter of the reinforced sealing ring (40) is larger than that of the large sealing gasket (20) the outer diameter.
28. 根据权利要求3所述的电子膨胀阀，其特征在于，所述大阀针部(32)为中空结构，所述大阀针部(32)的端部具有用于和所述大密封垫(20)密封配合的密封面(411)，所述密封面(411)为弧形面。The electronic expansion valve according to claim 3, characterized in that, the large valve needle part (32) is a hollow structure, and the end of the large valve needle part (32) has a structure for connecting with the large sealing gasket ( 20) A sealing surface (411) for sealing fit, where the sealing surface (411) is an arc-shaped surface.
29. 根据权利要求14所述的电子膨胀阀，其特征在于，所述大阀针部(32)具有和所述限位槽(322)连通的放置槽(212)，所述放置槽(212)的径向尺寸大于所述限位槽(322)的径向尺寸，所述小限位结构(60)位于所述放置槽(212)内。The electronic expansion valve according to claim 14, characterized in that, the large valve needle part (32) has a placement groove (212) communicating with the limiting groove (322), and the placement groove (212) The radial dimension is larger than the radial dimension of the limiting groove (322), and the small limiting structure (60) is located in the placing groove (212).
30. 根据权利要求29所述的电子膨胀阀，其特征在于，所述小限位结构(60)为环形结构，所述小限位结构(60)的外侧壁和所述放置槽(212)的内侧壁焊接，所述小限位结构(60)和所述小阀口(331)同轴设置，所述小限位结构(60)的内径大于等于所述小阀口(331)的最小径向尺寸。The electronic expansion valve according to claim 29, characterized in that the small limiting structure (60) is an annular structure, and the outer sidewall of the small limiting structure (60) and the inner side of the placement groove (212) Wall welding, the small limiting structure (60) and the small valve port (331) are coaxially arranged, and the inner diameter of the small limiting structure (60) is greater than or equal to the minimum radial direction of the small valve port (331) size.
31. 根据权利要求20所述的电子膨胀阀，其特征在于，所述小阀口(331)开口大的一端背离所述小限位结构(60)；所述大阀针部(32)具有侧开孔(213)，所述侧开孔(213)位于所述小密封垫(33)背离所述小限位结构(60)的一侧，所述小阀口(331)打开的情况下，所述小阀口(331)通过所述侧开孔(213)和所述第一流通孔(13)连通。 The electronic expansion valve according to claim 20, characterized in that, the large opening end of the small valve port (331) deviates from the small limit structure (60); the large valve needle portion (32) has a side opening hole (213), the side opening (213) is located on the side of the small sealing gasket (33) away from the small limiting structure (60), when the small valve port (331) is opened, the The small valve port (331) communicates with the first flow hole (13) through the side opening (213).