Electronic expansion valve

Abstract

The utility model discloses an electronic expansion valve, and relates to the technical field of valves. The valve element fixedly connected into the valve body is fixedly connected to the stator in the valve body in a sleeved mode. The rotor is rotationally sleeved in the valve body and is positioned in the stator; the nut is fixedly sleeved in the rotor; the screw rod is sleeved in the nut in a threaded manner; the valve rod assembly is connected with the lead screw, a first sawtooth part is arranged outside the valve rod assembly, and the valve rod assembly is matched with the valve element; the guide block is fixedly sleeved with the valve body, a second sawtooth part is arranged in the guide block, and the second sawtooth part is in sliding fit with the first sawtooth part. The utility model has the technical effect that the linear motion stability of the valve rod is good.

Description

Technical Field

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

[0002] The electronic expansion valve is a valve that is controlled based on electronic signals and controls the flow of the medium by adjusting the opening of the valve core. It has the advantage of being easy to adjust the flow of the medium.

[0003] The related electronic expansion valve generally realizes the regulation of medium flow by converting the rotational motion of the motor into the linear motion of the valve stem, but the linear motion of the related valve stem has poor smoothness, which easily leads to poor regulation of the medium flow. Utility Model Content

[0004] In view of the above technical problems, the utility model provides an electronic expansion valve, the linear motion stability of the valve stem of which is good.

[0005] In order to solve the above problems, the technical solution provided by the utility model is:

[0006] An electronic expansion valve comprises:

[0007] Valve body;

[0008] A valve core fixedly connected to the valve body

[0009] A stator fixedly sleeved in the valve body;

[0010] A rotor rotatably sleeved in the valve body, wherein the rotor is located in the stator;

[0011] A nut fixedly sleeved in the rotor;

[0012] A screw rod threadably sleeved in the nut;

[0013] A valve stem assembly connected to the screw rod, the valve stem assembly is provided with a first serration portion, and the valve stem assembly cooperates with the valve core;

[0014] A guide block is fixedly sleeved in the valve body, wherein a second sawtooth portion is arranged in the guide block, and the second sawtooth portion is slidably matched with the first sawtooth portion.

[0015] Optionally, the valve stem assembly comprises:

[0016] A valve stem body, one end of which is matched with the valve core;

[0017] A connecting body, one end of which is connected to the other end of the valve stem body, and the other end of which is connected to the screw rod;

[0018] Wherein, the first sawtooth portion is arranged outside the connecting body.

[0019] Optionally, the valve stem assembly further comprises an elastic member sleeved in the connecting body, wherein the elastic member contacts between the other end of the valve stem body and the screw rod.

[0020] Optionally, the first serration portion includes a plurality of first serration bodies arranged along the circumference of the valve stem assembly, and the second serration portion includes a plurality of second serration bodies arranged along the circumference of the guide block, and the plurality of first serration bodies and the plurality of second serration bodies are correspondingly slidably matched.

[0021] Optionally, the plurality of first serration bodies are evenly distributed along the circumference of the valve stem assembly, and the plurality of second serration bodies are evenly distributed along the circumference of the guide block.

[0022] Optionally, also include:

[0023] A detection rod connected to one end of the screw rod away from the valve stem assembly;

[0024] A linear displacement sensor is fixedly connected to the valve body, the linear displacement sensor cooperates with the detection rod, and the linear displacement sensor is electrically connected to the stator.

[0025] Optionally, also include:

[0026] two mounting seats connected to the valve body;

[0027] A plurality of mounting holes are arranged on the mounting seat.

[0028] Optionally, the rotor is rotatably sleeved in the valve body via a bearing.

[0029] The technical solution provided by the utility model has the following beneficial effects compared with the prior art: when adjustment is required, the stator is energized, the stator generates an excitation magnetic field, the rotor rotates, and the rotor drives the nut to rotate. Under the limiting action of the first serration portion and the second serration portion, the nut drives the lead screw and the valve stem assembly to perform linear motion synchronously, thereby changing the relative position of the valve stem assembly and the valve core to achieve the regulation of the medium flow rate, wherein the first serration portion and the second serration portion are also used to produce a good guiding effect, so that the linear motion of the valve stem assembly is smooth. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the structure of an electronic expansion valve proposed in an embodiment of the utility model;

[0031] Figure 2 This is one of the cross-sectional views of an electronic expansion valve proposed in an embodiment of the utility model;

[0032] Figure 3This is a second cross-sectional view of an electronic expansion valve proposed in an embodiment of the utility model;

[0033] Figure 4 for Figure 3 Partial diagram of A in the middle;

[0034] In the figure: 1. valve body; 2. valve core; 3. stator; 4. rotor; 5. nut; 6. screw rod; 7. valve stem assembly; 71. first serration portion; 711. first serration body; 72. valve stem body; 73. connecting body; 74. elastic member; 8. guide block; 81. second serration portion; 811. second serration body; 91. detection rod; 92. linear displacement sensor; 93. mounting seat; 931. mounting hole; 94. bearing. DETAILED DESCRIPTION

[0035] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings and embodiments.

[0036] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It should also be noted that, for the convenience of description, only the parts related to the utility model are shown in the accompanying drawings. The words "first", "second", etc. described in the present utility model are set for the convenience of describing the technical solution of the present utility model, and have no specific limiting effect. They are all general references and do not constitute a limiting effect on the technical solution of the present utility model. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments in the present application can be combined with each other. In the description of the present utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection between the insides of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. Multiple technical solutions in the same embodiment, and multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not have contradictions or conflicts, all of which are within the scope of protection required by the present utility model.

[0037] Example 1

[0038] Combined with Figure 1-4 , this embodiment provides an electronic expansion valve, including:

[0039] Valve body 1;

[0040] The valve core 2 is fixedly connected to the valve body 1

[0041] A stator 3 fixedly sleeved in the valve body 1;

[0042] The rotor 4 sleeved in the valve body 1 is rotated, and the rotor 4 is located in the stator 3;

[0043] A nut 5 fixedly sleeved in the rotor 4;

[0044] A screw rod 6 threadedly sleeved in a nut 5;

[0045] A valve stem assembly 7 connected to the screw rod 6, the valve stem assembly 7 is provided with a first sawtooth portion 71, and the valve stem assembly 7 cooperates with the valve core 2;

[0046] A guide block 8 is fixedly sleeved in the valve body 1 , and a second sawtooth portion 81 is provided in the guide block 8 . The second sawtooth portion 81 and the first sawtooth portion 71 are slidably matched.

[0047] Specifically, when adjustment is needed, power is supplied to the stator 3, and the stator 3 generates an excitation magnetic field, causing the rotor 4 to rotate, and the rotor 4 drives the nut 5 to rotate. Under the limiting action of the first serration portion 71 and the second serration portion 81, the nut 5 drives the screw rod 6 and the valve stem assembly 7 to perform linear motion synchronously, thereby changing the relative position of the valve stem assembly 7 and the valve core 2 to achieve the adjustment of the medium flow rate, wherein the first serration portion 71 and the second serration portion 81 are also used to produce a good guiding effect, so that the linear motion of the valve stem assembly 7 is smooth.

[0048] The valve body 1 is used to carry the valve core 2, the stator 3 and the rotor 4, etc.; the nut 5 and the screw rod 6 cooperate to convert the rotational motion into the linear motion.

[0049] Further, such as Figure 2 and 4 , the valve stem assembly 7 comprises:

[0050] A valve stem body 72, one end of which is matched with the valve core 2;

[0051] A connecting body 73, one end of the connecting body 73 is connected to the other end of the valve stem body 72, and the other end of the connecting body 73 is connected to the screw rod 6;

[0052] The first serration portion 71 is disposed outside the connecting body 73 .

[0053] Specifically, the valve stem body 72 is used to adjust the opening of the valve core 2 ; the connecting body 73 is used to connect the other end of the valve stem body 72 and the screw rod 6 .

[0054] Further, such as Figure 4 The valve stem assembly 7 further includes an elastic member 74 sleeved in the connecting body 73 , and the elastic member 74 contacts between the other end of the valve stem body 72 and the screw rod 6 .

[0055] Specifically, the elastic member 74 is used to pre-tighten the screw rod 6 so that the screw rod 6 and the nut 5 can be matched accurately. The elastic member 74 can be made of rubber, spring steel, etc.

[0056] Further, such as Figure 4The first serration portion 71 includes a plurality of first serration bodies 711 which are arranged along the circumference of the valve stem assembly 7, and the second serration portion 81 includes a plurality of second serration bodies 811 which are arranged along the circumference of the guide block 8. The plurality of first serration bodies 711 and the plurality of second serration bodies 811 are slidably matched with each other.

[0057] Specifically, the plurality of first serrated bodies 711 and the plurality of second serrated bodies 811 facilitate multi-point sliding fit between the valve stem assembly 7 and the guide block 8, so that the sliding stability of the two is good, thereby improving the linear motion stability of the valve stem assembly 7.

[0058] Further, such as Figure 4 A plurality of first serration bodies 711 are evenly distributed along the circumference of the valve stem assembly 7 , and a plurality of second serration bodies 811 are evenly distributed along the circumference of the guide block 8 .

[0059] Specifically, the circumferential uniform distribution facilitates increasing the uniformity of the interaction force between the valve stem assembly 7 and the guide block 8, and further improves the smoothness of the linear motion of the valve stem assembly 7.

[0060] Further, such as Figure 2 , also includes:

[0061] A detection rod 91 connected to an end of the screw rod 6 away from the valve stem assembly 7;

[0062] A linear displacement sensor 92 is fixedly connected to the valve body 1 , the linear displacement sensor 92 cooperates with the detection rod 91 , and the linear displacement sensor 92 is electrically connected to the stator 3 .

[0063] Specifically, the linear displacement sensor 92 is used to measure the position of the detection rod 91, thereby obtaining the relative position of the valve stem body 72 and the valve core 2, and transmitting the position signal to the controller, and the controller controls the stator 3 to power on or off, wherein the linear displacement sensor 92 is preferably an LVDT (linear variable differential transformer) displacement sensor.

[0064] Further, such as Figure 1 , also includes:

[0065] Two mounting seats 93 connected to the valve body 1;

[0066] A plurality of mounting holes 931 are provided on the mounting base 93 .

[0067] Specifically, the mounting seat 93 is used to support a plurality of mounting holes 931; the plurality of mounting holes 931 are used to cooperate with fasteners, and the fasteners are used to install the electronic expansion valve in a related piping system. The specific number of the plurality of mounting holes 931 is not limited, and is preferably two.

[0068] Further, such as Figure 2The rotor 4 is rotatably sleeved in the valve body 1 through the bearing 94 .

[0069] Specifically, the type of bearing 94 is preferably a deep groove ball bearing, and the number of bearings 94 is preferably two.

[0070] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. An electronic expansion valve, characterized in that: include: Valve body; A valve core fixedly connected to the valve body A stator fixedly sleeved in the valve body; A rotor rotatably sleeved in the valve body, wherein the rotor is located in the stator; A nut fixedly sleeved in the rotor; A screw rod threadably sleeved in the nut; A valve stem assembly connected to the screw rod, the valve stem assembly is provided with a first serration portion, and the valve stem assembly cooperates with the valve core; A guide block is fixedly sleeved in the valve body, wherein a second sawtooth portion is arranged in the guide block, and the second sawtooth portion is slidably matched with the first sawtooth portion.

2. An electronic expansion valve according to claim 1, characterized in that: The valve stem assembly comprises: A valve stem body, one end of which is matched with the valve core; A connecting body, one end of which is connected to the other end of the valve stem body, and the other end of which is connected to the screw rod; Wherein, the first sawtooth portion is arranged outside the connecting body.

3. An electronic expansion valve according to claim 2, characterized in that: The valve stem assembly also includes an elastic member sleeved in the connecting body, and the elastic member contacts between the other end of the valve stem body and the screw rod.

4. An electronic expansion valve according to any one of claims 1 to 3, characterized in that: The first serration portion includes a plurality of first serration bodies arranged along the circumference of the valve stem assembly, and the second serration portion includes a plurality of second serration bodies arranged along the circumference of the guide block, and the plurality of first serration bodies and the plurality of second serration bodies are correspondingly slidably matched.

5. An electronic expansion valve according to claim 4, characterized in that: The plurality of first serration bodies are evenly distributed along the circumference of the valve stem assembly, and the plurality of second serration bodies are evenly distributed along the circumference of the guide block.

6. An electronic expansion valve according to any one of claims 1 to 3, characterized in that: Also includes: A detection rod connected to one end of the screw rod away from the valve stem assembly; A linear displacement sensor is fixedly connected to the valve body, the linear displacement sensor cooperates with the detection rod, and the linear displacement sensor is electrically connected to the stator.

7. An electronic expansion valve according to any one of claims 1 to 3, characterized in that: Also includes: two mounting seats connected to the valve body; A plurality of mounting holes are arranged on the mounting seat.

8. An electronic expansion valve according to any one of claims 1 to 3, characterized in that: The rotor is rotatably sleeved in the valve body via a bearing.

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