CN2536849Y

CN2536849Y - Electronic expansion valve

Info

Publication number: CN2536849Y
Application number: CN02208097.XU
Authority: CN
Inventors: 丁明杨; 陈泽民; 仇亚洲
Original assignee: RIFA SPINDLE CO Ltd XINCHANG COUNTY ZHEJIANG PROV
Current assignee: RIFA SPINDLE CO Ltd XINCHANG COUNTY ZHEJIANG PROV
Priority date: 2002-03-22
Filing date: 2002-03-22
Publication date: 2003-02-19
Anticipated expiration: 2012-03-22

Abstract

The utility model discloses an electronic expansion valve, comprising a valve body, a valve base, a rotor, a spindle, a stepping motor, a valve stem, a nut for the valve stem and a supporting bracket; wherein, a valve hole is arranged on the valve base; the valve body is fixed on the valve base; the rotor, the valve stem, the nut for the valve stem, the spindle and the supporting bracket are all enclosed in the cavity of the valve body; the stepping motor is sleeved on the valve body; the rotor is fixedly connected with the valve stem as a whole; the valve stem is screwed with the valve stem. The utility model has the advantages of being suitable for the electronic regulation of the liquid supply of the evaporator in a refrigerating unit and the electronic regulation of the flow of common liquid at the same time. Therefore, the utility model is an indispensable member to realize intelligent control and mechanical-electrical integration of the refrigerating unit and the fluid flow regulation.

Description

Electronic expansion valve

一、技术领域1. Technical field

本实用新型涉及一种膨胀阀，尤其与采用电子式流量调节的新型电子膨胀阀有关。The utility model relates to an expansion valve, in particular to a novel electronic expansion valve adopting electronic flow regulation.

二、背景技术2. Background technology

目前国内制冷空调系统中流量控制是采用毛细管及热力膨胀阀，但随着变频技术的应用，对系统的流量调节范围、速度、精度等要求大大提高，为使系统在最佳工况下工作，必须采用电子膨胀阀，而目前使用的电子膨胀阀存在着结构复杂，体积庞大，运行不可靠，工艺性差，成本高等缺点。At present, capillary tubes and thermal expansion valves are used for flow control in domestic refrigeration and air-conditioning systems. However, with the application of frequency conversion technology, the requirements for the flow adjustment range, speed, and accuracy of the system have been greatly improved. In order to make the system work under optimal conditions, Electronic expansion valves must be used, but currently used electronic expansion valves have disadvantages such as complex structure, bulky size, unreliable operation, poor manufacturability, and high cost.

三、发明内容3. Contents of the invention

本实用新型的目的是提供一种结构紧凑，体积小，运行可靠，控制精度高，使用寿命长，工艺简单，成本低的电子膨胀阀。The purpose of the utility model is to provide an electronic expansion valve with compact structure, small volume, reliable operation, high control precision, long service life, simple process and low cost.

为了实现上述目的，本实用新型是通过如下技术解决方案实现的：电子膨胀阀，包括阀体，阀座，转子，阀针，步进电机，阀杆，阀杆螺母及支承架，阀座上设有阀孔，阀座上固定阀体，转子，阀杆，阀杆螺母，阀针及支承架都封闭于阀体腔内，步进电机套在阀体壳上，转子与阀杆固定连接成一体，阀杆与阀杆螺母螺纹连接。In order to achieve the above object, the utility model is achieved through the following technical solutions: electronic expansion valve, including valve body, valve seat, rotor, valve needle, stepping motor, valve stem, valve stem nut and support frame, on the valve seat There is a valve hole, the valve body is fixed on the valve seat, the rotor, the valve stem, the valve stem nut, the valve needle and the supporting frame are all closed in the valve body cavity, the stepping motor is set on the valve body shell, and the rotor and the valve stem are fixedly connected to form a In one piece, the valve stem is threadedly connected with the valve stem nut.

所述的电子膨胀阀，阀针上端设有弹簧，阀针径向设有定位套，定位套设于阀杆内。In the electronic expansion valve, a spring is provided on the upper end of the valve needle, and a positioning sleeve is provided radially on the valve needle, and the positioning sleeve is provided in the valve stem.

所述的电子膨胀阀，它还包括一套升程限位机构，该机构由转子上的上限位块，阀杆螺母上的下限位块及限位弹簧组成，且位于阀体腔内。The electronic expansion valve also includes a set of lift limiting mechanism, which is composed of an upper limit block on the rotor, a lower limit block on the stem nut and a limit spring, and is located in the valve body cavity.

本实用新型由于采用了上述技术解决方案，因而具有如下有益效果：(一)是转子采用双支承，避免转子摆动，确保了转子运行可靠，提高了控制精度和使用寿命；(二)是阀针与阀杆的装配采用弹簧，阀针定位套，确保阀针在关闭阀孔时的弹性缓冲与自动调心，以及阀杆阀针组件配合尺寸的一致性，提高了控制精度及使用寿命；(三)是采用转子上限位块，阀杆螺母下限位块，定位套及限位弹簧的结构，确保转子转动时的起始位置及终止位置，保证流量控制精度；(四)是阀体外壳采用拉伸成型结构，适合大批量生产，降低生产成本，提高密封可靠性。The utility model has the following beneficial effects due to the adoption of the above-mentioned technical solutions: (1) the rotor adopts double supports to avoid the swing of the rotor, which ensures the reliable operation of the rotor and improves the control accuracy and service life; (2) the valve needle The assembly with the valve stem adopts a spring and a needle positioning sleeve to ensure the elastic cushioning and automatic centering of the valve needle when closing the valve hole, as well as the consistency of the matching dimensions of the valve stem and needle assembly, which improves the control accuracy and service life; ( Three) the upper limit block of the rotor, the lower limit block of the valve stem nut, the positioning sleeve and the limit spring structure are used to ensure the initial position and the end position of the rotor when it rotates, and to ensure the accuracy of flow control; (four) the valve body shell adopts Stretch forming structure, suitable for mass production, reducing production cost and improving sealing reliability.

四、附图说明4. Description of drawings

图1是本实用新型电子膨胀阀的结构示意图。Fig. 1 is a schematic structural view of the electronic expansion valve of the present invention.

图中序号分别为：1.阀体 2.支承架 3.限位弹簧 4.转子5.步进电机 6.阀体腔 7.上限位块 8.下限位块 9.弹簧 10.阀杆 11.阀杆螺母 12.定位套 13.阀针 14.阀座 15.阀孔The serial numbers in the figure are: 1. Valve body 2. Support frame 3. Limit spring 4. Rotor 5. Stepping motor 6. Valve body cavity 7. Upper limit block 8. Lower limit block 9. Spring 10. Valve stem 11. Stem nut 12. Positioning sleeve 13. Valve needle 14. Valve seat 15. Valve hole

五、具体实施方式5. Specific implementation

如图1所示，电子膨胀阀包括阀体1，阀座14，转子4，阀针13，步进电机5，阀杆10，阀杆螺母11，支承架2及升程限位机构，阀座14上设有阀孔15，阀座14上焊有阀体1，形成一个密封容积，被控制流体在该容积中流动，将转子4，阀杆10，阀杆螺母11，阀针13，支承架2及升程限位机构都封闭于阀体腔6内，步进电机5套在阀体壳上，转子4与阀杆10固定连接成一体，阀杆10与阀杆螺母11螺纹连接，当转子转动时通过阀杆10，阀杆螺母11的螺纹传动而带动阀针13作上下移动，实现阀孔15开度大小的精确控制，确保流量特性，在阀针13上端设有弹簧9，阀针13径向设有定位套12，定位套位于阀杆10内，当阀针与阀孔关闭时弹簧9发挥弹性作用，使阀针与阀孔实现自动调心与弹性闭合，延长使用寿命，确保闭合时的内泄漏量，阀有两个接口分别是A、B，用于连接铜管，这样阀与制冷系统的连接方便、可靠，升程限位机构由转子4上的上限位块7，阀杆螺母上的下限位块8及限位弹簧3组成，且位于阀体腔6内，通过转子上限位块7和阀杆螺母下限位块8，及限位弹簧3能正确保证转子转动时起始位置与终止位置，确保控制精度的一致性和重复性。转子通过支承架2，阀杆10和阀杆螺母11的内外螺纹的啮合能提高转子精度的控制，减少转子在工作中的摆动，提高转子的使用寿命。As shown in Figure 1, the electronic expansion valve includes a valve body 1, a valve seat 14, a rotor 4, a valve needle 13, a stepper motor 5, a valve stem 10, a valve stem nut 11, a support frame 2 and a lift limiting mechanism, and the valve The seat 14 is provided with a valve hole 15, and the valve body 1 is welded on the valve seat 14 to form a sealed volume in which the controlled fluid flows, and the rotor 4, the valve stem 10, the valve stem nut 11, the valve needle 13, The support frame 2 and the lift limit mechanism are all enclosed in the valve body cavity 6, the stepping motor 5 is set on the valve body shell, the rotor 4 is fixedly connected with the valve stem 10, and the valve stem 10 is threadedly connected with the valve stem nut 11. When the rotor rotates, the valve needle 13 is driven to move up and down through the thread transmission of the valve stem 10 and the valve stem nut 11, so as to realize the precise control of the opening of the valve hole 15 and ensure the flow characteristics. The valve needle 13 is provided with a positioning sleeve 12 in the radial direction, and the positioning sleeve is located in the valve stem 10. When the valve needle and the valve hole are closed, the spring 9 plays an elastic role, so that the valve needle and the valve hole realize automatic centering and elastic closing, prolonging the service life , to ensure the internal leakage when closed. The valve has two ports, A and B, which are used to connect copper pipes, so that the connection between the valve and the refrigeration system is convenient and reliable. The lift limit mechanism is controlled by the upper limit block on the rotor 4. 7. The lower limit block 8 on the stem nut and the limit spring 3 are located in the valve body cavity 6. The upper limit block 7 of the rotor, the lower limit block 8 of the valve stem nut, and the limit spring 3 can ensure the correct rotation of the rotor The starting position and the ending position can ensure the consistency and repeatability of the control accuracy. The engagement of the internal and external threads of the valve stem 10 and the valve stem nut 11 through the support frame 2 of the rotor can improve the control of the precision of the rotor, reduce the swing of the rotor during work, and increase the service life of the rotor.

Claims

1. an electronic expansion valve, comprising valve body (1), valve seat (14), rotor (4), valve needle (13) and stepper motor (5), valve seat (14) is provided with valve hole ( 15), it is characterized in that: it also comprises valve stem (10), valve stem nut (11) and supporting frame (2), valve body (1) is fixed on valve seat (14), rotor (4), valve stem ( 10), the valve stem nut (11), the valve needle (13) and the supporting frame (2) are all enclosed in the valve body cavity (6), the stepping motor (5) is sleeved on the valve body shell, the rotor (4) and the valve The rod (10) is fixedly connected into one body, and the valve rod (10) is threadedly connected with the valve rod nut (11).

2. The electronic expansion valve according to claim 1, characterized in that: a spring (9) is provided on the upper end of the valve needle (13), and a positioning sleeve (12) is arranged radially on the valve needle (13), and the positioning sleeve is arranged on the valve inside the rod (10).

3. The electronic expansion valve according to claim 1 or 2, characterized in that it also includes a set of lift limit mechanism, which consists of an upper limit block (7) on the rotor (4), and a valve stem nut on the The lower limit block (8) and the limit spring (3) are formed, and are located in the valve body cavity (6).