Electronic expansion valve capable of preventing clamping stagnation

Abstract

The electronic expansion valve capable of preventing clamping stagnation comprises a valve body, a valve rod and a valve element assembly, the valve rod and the valve element assembly are installed in the valve body, the valve body comprises a guide pipe sleeve assembly and a valve seat connected to the lower end of the guide pipe sleeve assembly, the valve element assembly comprises a valve element body and a valve element spring, and the valve element spring is arranged on the valve rod in a sleeved mode. The valve element assembly further comprises a valve element flat gasket, a plurality of arc holes are formed in the top of the valve element body at intervals, a ball is placed in each arc hole, the balls partially extend out of the arc holes, the valve rod is sleeved with the valve element flat gasket, the lower side of the valve element flat gasket abuts against the balls, the upper end of the valve element spring abuts against the guide pipe sleeve assembly, and the lower end of the valve element spring abuts against the valve element flat gasket. When the valve element body rotates, the valve element flat gasket can keep a sliding state and does not rotate together with the valve element due to friction, the structure can replace a bearing to be used under the condition that no non-standard ball bearing exists, the noise problem of a product is effectively solved, the product is helped to run more smoothly, and clamping stagnation is prevented.

Description

Technical Field

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

[0002] The large-diameter electronic expansion valve is mainly installed between the condenser and evaporator of the automobile air-conditioning refrigeration system, and is the dividing point between the high pressure and low pressure of the air-conditioning refrigeration system.

[0003] The existing electronic expansion valve drives the valve core to move through the valve stem to open or close the valve. A valve core spring is installed on the top of the valve core. Since the valve stem rotates, when the valve stem drives the valve core to move upward, it will drive the valve core to make a slight rotational movement. The two ends of the valve core spring pressed on the top of the valve core are worn flat. Due to friction, there will be a rattling sound of the rotating spring during actual operation of the valve, and the valve will not run smoothly. Utility Model Content

[0004] In view of the defects in the prior art, the utility model aims to provide an electronic expansion valve which can prevent sticking.

[0005] The technical solution adopted by the utility model is:

[0006] An electronic expansion valve for preventing sticking comprises a valve body and a valve stem and a valve core assembly installed in the valve body, the valve body comprises a catheter sleeve assembly and a valve seat connected to the lower end of the catheter sleeve assembly, the valve core assembly comprises a valve core body and a valve core spring, the valve core spring is sleeved on the valve stem, the valve core assembly also comprises a valve core flat pad, a plurality of arc holes are spaced apart on the top of the valve core body, a ball is placed in each of the arc holes, and the ball part extends out of the arc hole, the valve core flat pad is sleeved on the valve stem, and its lower side abuts against the ball, the upper end of the valve core spring abuts against the catheter sleeve assembly, and the lower end abuts against the valve core flat pad.

[0007] Furthermore, the valve seat includes an upper valve seat and a lower valve seat, the upper valve seat is provided with a first cavity, the lower valve seat is provided with a second cavity connected to the first cavity, the valve core assembly is installed in the valve body, and its lower end is sealed between the first cavity and the second cavity, and can move upward when the valve stem moves upward to the first position.

[0008] Furthermore, the valve core body includes an upper valve core, a lower valve core and a valve core sleeve, the lower valve core is installed at the lower end of the upper valve core, the valve core sleeve is sleeved on the valve stem and fixed to the upper end of the upper valve core, the arc hole is opened at the top of the valve core sleeve, and when the valve stem moves upward to the first position, it abuts against the valve core sleeve to drive the valve core assembly to move upward.

[0009] Furthermore, it also includes a valve needle assembly, the upper valve core is provided with a third cavity connected to the second cavity, the lower valve core is provided with a fourth cavity connected to the first cavity, and an adjustment hole connecting the fourth cavity and the second cavity, the valve needle assembly includes a valve needle and a valve needle sleeve, the lower end of the valve needle is provided with a variable diameter adjustment section, the variable diameter adjustment section is installed in the adjustment hole, the valve needle sleeve is sleeved on the upper end of the valve needle and fixed to the lower end of the valve stem, when the valve stem moves upward to the second position, it abuts against the valve needle to drive the valve needle to move upward, and when the valve stem moves to the first position, it abuts against the valve core sleeve to drive the valve core assembly to move upward, and the height of the first position is greater than the height of the second position.

[0010] Furthermore, the valve core assembly also includes a pressing plate, which is sealingly arranged between the upper valve core and the lower valve core.

[0011] Furthermore, a mounting cavity is provided at the lower end of the valve stem, and a contact portion extending radially is provided on the valve needle near its upper end. The contact portion is located in the mounting cavity, and its lower side can contact the valve needle sleeve.

[0012] Furthermore, the valve needle assembly also includes a valve needle spring, a spring support column and a valve needle flat washer, the spring support column is installed at the upper end of the installation cavity, the valve needle flat washer is located between the valve stem and the spring support column, the upper end of the valve needle spring is sleeved on the spring support column, and the lower end of the valve needle spring is sleeved on the upper end of the valve needle.

[0013] Furthermore, the upper valve core and the pressing plate are provided with a hole for the valve needle to pass through, the lower end of the valve needle passes through the hole and fits in the adjusting hole, and a dynamic sealing assembly that cooperates with the valve needle is provided between the bottom of the upper valve core and the pressing plate.

[0014] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0016] Figure 1 A schematic diagram of the structure of an electronic expansion valve for preventing sticking provided in an embodiment of the present application;

[0017] Figure 2A partial enlarged view of an electronic expansion valve for preventing sticking provided in an embodiment of the present application;

[0018] Figure 3 This is a schematic diagram of the structure of the valve core sleeve provided in an embodiment of the present application.

[0019] Among them, the catheter sleeve assembly 11, the upper valve seat 12, the lower valve seat 13, the first cavity 14, the second cavity 15, the valve core assembly 2, the third cavity 21, the fourth cavity 22, the upper valve core 23, the lower valve core 24, the valve core sleeve 25, the arc hole 251, the valve core flat pad 26, the valve core spring 27, the pressing piece 28, the valve needle assembly 3, the valve needle 31, the valve needle sleeve 32, the valve needle spring 33, the spring support column 34, the valve needle flat pad 35, and the valve stem 4. DETAILED DESCRIPTION

[0020] Here, it should be noted that the functions and methods involved in the present invention are merely conventional adaptive applications of the prior art. Therefore, the improvement of the present invention on the prior art is essentially the connection relationship between the hardware, rather than the functions and methods themselves. That is, although the present invention involves some functions and methods, it does not include improvements to the functions and methods themselves. The description of the functions and methods in the present invention is to better illustrate the present invention so as to better understand the present invention.

[0021] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0022] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which the utility model belongs.

[0023] See also Figures 1 to 3 The present application discloses an electronic expansion valve for preventing sticking, comprising a valve body, a valve stem 4 and a valve core assembly 2 installed in the valve body, the valve body comprising a conduit sleeve assembly 11 and a valve seat connected to the lower end of the conduit sleeve assembly 11, the valve core assembly 2 comprising a valve core body and a valve core spring 27, the valve core spring 27 is sleeved on the valve stem 4, the valve core assembly 2 also comprises a valve core flat pad 26, a plurality of arc holes 251 are spaced apart on the top of the valve core body, a ball is placed in each arc hole 251, and the ball part extends out of the arc hole 251, the valve core flat pad 26 is sleeved on the valve stem 4, and its lower side abuts against the ball, the upper end of the valve core spring 27 abuts against the conduit sleeve assembly 11, and its lower end abuts against the valve core flat pad 26.

[0024] The present application opens a plurality of arc holes 251 at intervals on the top of the valve core body, places a ball in each arc hole 251, and the lower side of the valve core flat pad 26 abuts against the ball. When the valve core body rotates, the valve core flat pad 26 can maintain a sliding state instead of rotating with the valve core due to friction. This structure can replace bearings in the absence of non-standard ball bearings, effectively improving the noise problem of the product, helping the product to run more smoothly, and preventing jamming.

[0025] The upper end of the valve stem 4 is threadedly connected to the catheter sleeve assembly 11, and its upper end extends out of the upper end of the catheter sleeve assembly 11 to be connected to the driving device. Under the action of the driving device, the valve stem 44 can move axially along the catheter sleeve assembly 11.

[0026] The valve seat includes an upper valve seat 12 and a lower valve seat 13. The upper end of the upper valve seat 12 is connected to the lower end of the catheter sleeve assembly 11. A first cavity 14 is defined on the upper valve seat 12. The upper end of the lower valve seat 13 is connected to the lower end of the upper valve seat 12. The lower valve seat 13 is defined with a second cavity 15 connected to the first cavity 14. The valve core assembly 2 is installed in the valve body, and its lower end is sealed between the first cavity 14 and the second cavity 15. It can move upward when the valve stem 4 moves upward to the first position, so that the first cavity 14 is connected to the second cavity 15, and the valve is opened.

[0027] The valve core body includes an upper valve core 23, a lower valve core 24 and a valve core sleeve 25. The lower valve core 24 is installed at the lower end of the upper valve core 23. The valve core sleeve 25 is sleeved on the valve stem 4 and fixed to the upper end of the upper valve core 23. The arc hole 251 is opened at the top of the valve core sleeve 25. When the valve stem 4 moves upward to the first position, it abuts against the valve core sleeve 25 to drive the valve core assembly 2 to move upward. The valve core flat pad 26 is sleeved on the valve stem 4, and the gap between it and the valve stem 4 is matched. The lower side of the valve core flat pad 26 is slidably matched with the ball on the valve core sleeve 25.

[0028] It also includes a valve needle assembly 3, the upper valve core 23 is provided with a third cavity 21 connected to the second cavity 15, the lower valve core 24 is provided with a fourth cavity 22 connected to the first cavity 14, and an adjustment hole connecting the fourth cavity 22 and the second cavity 15, the valve needle assembly 3 includes a valve needle 31 and a valve needle sleeve 32, the lower end of the valve needle 31 is provided with a variable diameter adjustment section, the variable diameter adjustment section is installed in the adjustment hole, the valve needle sleeve 32 is sleeved on the upper end of the valve needle 31 and fixed to the lower end of the valve stem 4, when the valve stem 4 moves upward to the second position, it abuts against the valve needle 31 to drive the valve needle 31 to move upward, and when the valve stem 4 moves to the first position, it abuts against the valve core sleeve 25 to drive the valve core assembly 2 to move upward, and the height of the first position is greater than the height of the second position.

[0029] In order to prevent leakage, the valve core assembly 2 further includes a pressing plate 28 , which is sealingly disposed between the upper valve core 23 and the lower valve core 24 to prevent the refrigerant from flowing from the fourth cavity 22 to the third cavity 21 .

[0030] The lower end of the valve stem 4 is provided with a mounting cavity, and the valve needle 31 has an abutment portion extending radially thereof near its upper end. The abutment portion is located in the mounting cavity, and its lower side can abut against the valve needle sleeve 32 .

[0031] The valve needle assembly 3 also includes a valve needle spring 33, a spring support column 34 and a valve needle flat washer 35. The spring support column 34 is installed at the upper end of the installation cavity, and the valve needle flat washer 35 is located between the valve stem 4 and the spring support column 34. The upper end of the valve needle spring 33 is sleeved on the spring support column 34, and the lower end thereof is sleeved on the upper end of the valve needle 31.

[0032] The upper valve core 23 and the pressing plate 28 are provided with holes for the valve needle 31 to pass through. The lower end of the valve needle 31 passes through the hole and fits in the adjustment hole. A dynamic sealing assembly that cooperates with the valve needle 31 is provided between the bottom of the upper valve core 23 and the pressing plate 28.

[0033] With the above structure, the valve stem 4 moves up and down in the valve body under the action of the driving device; when the valve is in the closed state, the lower end of the valve core assembly 2 is blocked between the first cavity 14 and the second cavity 15, and the lower end of the valve needle 31 of the valve needle assembly 3 is blocked in the adjusting hole; when the valve needs to be opened, the driving device rotates to drive the valve stem 4 to move upward, and when the valve stem 4 is in the second position, the valve needle sleeve 32 abuts against the valve needle 31, driving the valve needle 31 to move upward, and the passages between the first cavity 14, the fourth cavity 22 and the second cavity 15 are opened, and the refrigerant or air can flow to the fourth cavity 22 through the first cavity 14, the fourth cavity 22 and the adjusting hole; since the lower end of the valve needle 31 is provided with a variable diameter adjustment section, when the valve needle 31 moves upward, the flow area of ​​the adjusting hole is adjusted to achieve the purpose of the refrigerant flow passing through the adjusting hole; the valve stem 4 continues to move upward to the first position, and the valve needle sleeve 32 abuts against the valve core assembly 2, driving the valve core assembly When the valve is closed, the drive device rotates in the opposite direction to drive the valve stem 4 to move downward, and the valve core assembly 2 and the valve needle assembly 3 move downward with the valve stem 4. When the valve stem 4 moves to the first position, the lower end of the valve core assembly 2 abuts against the lower valve seat 13, closing the passage between the first cavity 14 and the second cavity 15. Then the valve stem 4 continues to move downward until the lower end of the valve needle 31 is completely blocked in the regulating hole, thereby closing the valve and achieving the purpose of throttling and reducing pressure of the valve. After the valve is closed, the refrigerant or air in the fourth cavity 22 can flow into the third cavity 21 under pressure, thereby realizing the reverse use of the valve, relieving the pressure to the top of the valve body, and ensuring that the refrigerant can only flow out from the large valve needle assembly 3 during forward circulation, effectively preventing the product from leaking internally.

[0034] During the opening and closing process of the valve, the valve core body may rotate with the valve stem 4 to a certain extent. By opening a circular arc hole 251 on the valve core sleeve 25 and placing a ball in the circular arc hole 251, the lower side of the valve core flat pad 26 abuts against the ball, so that when the valve core body rotates, the valve core flat pad 26 will slide to a certain extent, and the valve core spring 27 abuts against the valve core flat pad 26, thereby avoiding the rattling noise during the opening and closing process of the valve, and the valve is opened and closed more smoothly.

[0035] The valve of the present application can be used in automobile air-conditioning systems, ensuring that the refrigerant or air can only flow from the first cavity 14 to the fourth cavity 22, or from the first cavity 14, the fourth cavity 22 and the adjustment hole to the second cavity 15 when flowing in the forward direction; the third cavity 21 is always connected to the second cavity 15, and when the valve is closed, the refrigerant or air in the second cavity 15 flows into the third cavity 21 under pressure, realizing the reverse pressure relief effect of the valve, and the operation is smoother.

[0036] In this application, unless otherwise clearly specified and limited, the terms "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0037] In the specification of the present utility model, a lot of specific details are described. However, it is understood that the embodiments of the present utility model can be practiced without these specific details. In some examples, well-known methods, systems and techniques are not shown in detail so as not to obscure the understanding of this specification.

[0038] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, systems, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, systems, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. An electronic expansion valve for preventing sticking, comprising a valve body and a valve stem and a valve core assembly installed in the valve body, wherein the valve body comprises a conduit sleeve assembly and a valve seat connected to the lower end of the conduit sleeve assembly, and the valve core assembly comprises a valve core body and a valve core spring, wherein the valve core spring is sleeved on the valve stem, It is characterized in that The valve core assembly also includes a valve core flat gasket, a plurality of arc holes are spaced apart on the top of the valve core body, a ball is placed in each of the arc holes, and the ball part extends out of the arc hole, the valve core flat gasket is sleeved on the valve stem, and its lower side abuts against the ball, the upper end of the valve core spring abuts against the guide tube sleeve assembly, and its lower end abuts against the valve core flat gasket.

2. The electronic expansion valve for preventing sticking according to claim 1, It is characterized in that The valve seat includes an upper valve seat and a lower valve seat, the upper valve seat is provided with a first cavity, the lower valve seat is provided with a second cavity connected to the first cavity, the valve core assembly is installed in the valve body, and its lower end is sealed between the first cavity and the second cavity, and can move upward when the valve stem moves upward to a first position.

3. The electronic expansion valve for preventing sticking according to claim 2, It is characterized in that The valve core body includes an upper valve core, a lower valve core and a valve core sleeve. The lower valve core is installed at the lower end of the upper valve core. The valve core sleeve is sleeved on the valve stem and fixed to the upper end of the upper valve core. The arc hole is opened at the top of the valve core sleeve. When the valve stem moves upward to the first position, it abuts against the valve core sleeve to drive the valve core assembly to move upward.

4. The electronic expansion valve for preventing sticking according to claim 3, It is characterized in that The valve stem further comprises a valve needle assembly, wherein the upper valve core is provided with a third cavity connected to the second cavity, the lower valve core is provided with a fourth cavity connected to the first cavity, and an adjustment hole connecting the fourth cavity and the second cavity, the valve needle assembly comprises a valve needle and a valve needle sleeve, the lower end of the valve needle is provided with a variable diameter adjustment section, the variable diameter adjustment section is installed in the adjustment hole, the valve needle sleeve is sleeved on the upper end of the valve needle and fixed to the lower end of the valve stem, when the valve stem moves upward to the second position, the valve needle sleeve abuts against the valve needle to drive the valve needle to move upward, and when the valve stem moves to the first position, the valve core sleeve abuts against the valve core sleeve to drive the valve core assembly to move upward, and the height of the first position is greater than the height of the second position.

5. The electronic expansion valve for preventing sticking according to claim 4, It is characterized in that The valve core assembly further comprises a pressing plate, which is sealingly arranged between the upper valve core and the lower valve core.

6. The electronic expansion valve for preventing sticking according to claim 4, It is characterized in that The lower end of the valve stem is provided with a mounting cavity, and the valve needle is provided with an abutment portion extending radially thereof near its upper end. The abutment portion is located in the mounting cavity, and its lower side can abut against the valve needle sleeve.

7. The electronic expansion valve for preventing sticking according to claim 6, It is characterized in that The valve needle assembly also includes a valve needle spring, a spring support column and a valve needle flat washer. The spring support column is installed at the upper end of the installation cavity, and the valve needle flat washer is located between the valve stem and the spring support column. The upper end of the valve needle spring is sleeved on the spring support column, and the lower end of the valve needle spring is sleeved on the upper end of the valve needle.

8. The electronic expansion valve for preventing sticking according to claim 5, It is characterized in that The upper valve core and the pressing plate are provided with a hole for the valve needle to pass through, the lower end of the valve needle passes through the hole and fits in the adjusting hole, and a dynamic sealing assembly that cooperates with the valve needle is provided between the bottom of the upper valve core and the pressing plate.

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