Double-valve-needle electronic expansion valve

Abstract

The double-valve-needle electronic expansion valve comprises a valve body, a valve rod, a large valve needle assembly and a small valve needle assembly, and the lower end of the valve body is provided with a first cavity and a second cavity which are communicated with each other; a third cavity communicated with the second cavity is formed in the upper end of the large valve needle assembly, a fourth cavity communicated with the first cavity and an adjusting hole communicated with the fourth cavity and the second cavity are formed in the lower end of the large valve needle assembly, and the lower end of the large valve needle assembly is plugged between the first cavity and the second cavity; the small valve needle assembly comprises a small valve needle and a valve needle sleeve, the lower end of the small valve needle is provided with a variable-diameter adjusting section, the variable-diameter adjusting section is installed in the adjusting hole, and the valve needle sleeve is arranged at the upper end of the small valve needle in a sleeving mode and fixed to the lower end of the valve rod; reverse use of the valve is achieved, pressure is relieved to the top of the valve body, it can be guaranteed that a refrigerant can only flow out from the large and small valve needle assemblies during forward circulation, and the problem of inner leakage of a product is effectively solved.

Description

Technical Field

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

[0002] Large-caliber electronic expansion valves are mainly installed between the condenser and evaporator of the automotive air conditioning refrigeration system, and are the dividing point between the high pressure and low pressure of the air conditioning refrigeration system. Now the whole vehicle air conditioning system basically requires the expansion valve to be able to be used in both directions. The current large-caliber expansion valve is generally achieved by increasing the magnetism of the rotor. Increasing the magnetism of the rotor will increase the cost and is not conducive to the consistency of the structure of similar products. Utility Model Content

[0003] In view of the defects in the prior art, the purpose of the utility model is to provide a double-valve needle electronic expansion valve to solve the problem of reverse use of the expansion valve.

[0004] The technical solution adopted by the utility model is:

[0005] A double-valve needle electronic expansion valve comprises a valve body and a valve stem installed in the valve body.

[0006] It also includes a large valve needle assembly and a small valve needle assembly, and the lower end of the valve body is provided with a first cavity and a second cavity that are interconnected;

[0007] The upper end of the large valve needle assembly is provided with a third cavity connected to the second cavity, the lower end is provided with a fourth cavity connected to the first cavity, and an adjustment hole connected to the fourth cavity and the second cavity, the large valve needle assembly is installed in the valve body, and the lower end thereof is blocked between the first cavity and the second cavity;

[0008] The small valve needle assembly includes a small valve needle and a valve needle sleeve. The lower end of the small valve needle is provided with a variable diameter adjustment section, which is installed in the adjustment hole. The valve needle sleeve is sleeved on the upper end of the small valve needle and fixed to the lower end of the valve stem. When the valve stem moves to a first position, it abuts against the small valve needle to drive the small valve needle to move upward, and when the valve stem moves upward to a second position, it abuts against the large valve needle assembly to drive the large valve needle assembly to move upward. The height of the second position is greater than that of the first position.

[0009] Furthermore, the valve body includes a catheter sleeve assembly, an upper valve seat and a lower valve seat connected in sequence from top to bottom, the first cavity is arranged in the upper valve seat, the second cavity is arranged in the lower valve seat, and a channel connected to the first cavity is provided radially along the upper valve seat.

[0010] Furthermore, the upper end of the valve stem is threadedly connected to the catheter sleeve assembly, and the upper end of the valve stem extends out of the upper end of the catheter sleeve assembly to be connected to the driving device.

[0011] Furthermore, the large valve needle assembly includes an upper valve core, a lower valve core, a valve core sleeve and a pressing plate; the third cavity is axially arranged along the upper end of the upper valve core, and the third cavity is connected to the second cavity through a plurality of vertically arranged first channels; the fourth cavity is arranged in the lower valve core, and the fourth cavity is connected to the first cavity through a plurality of radially arranged second channels; the pressing plate is sealably arranged between the upper valve core and the lower valve core; the valve core sleeve is fixed at the upper end of the upper valve core, and is sleeved outside the valve stem to abut against the valve needle sleeve when the valve stem moves upward to the second position.

[0012] Furthermore, the large valve needle assembly also includes a valve core flat washer and a valve core spring, the valve core flat washer is arranged on the top of the valve core sleeve, the valve core spring sleeve is arranged on the valve stem, its upper end abuts against the catheter sleeve assembly, and its lower end abuts against the large valve needle assembly.

[0013] 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.

[0014] Furthermore, the small 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.

[0015] 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.

[0016] 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

[0017] 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.

[0018] Figure 1A schematic diagram of the structure of a double-valve needle electronic expansion valve provided in an embodiment of the present application;

[0019] Figure 2 This is a partially enlarged view of the double-valve needle electronic expansion valve provided in an embodiment of the present application.

[0020] 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 large valve needle 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 valve core flat pad 26, the valve core spring 27, the pressing piece 28, the small 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

[0021] 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.

[0022] 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.

[0023] 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.

[0024] See also Figure 1-2The present application discloses a double-valve needle electronic expansion valve, comprising a valve body and a valve stem 4 installed in the valve body, and also comprising a large valve needle assembly 2 and a small valve needle assembly 3. The lower end of the valve body is provided with a first cavity 14 and a second cavity 15 which are connected to each other; the upper end of the large valve needle assembly 2 is provided with a third cavity 21 which is connected to the second cavity 15, and the lower end is provided with a fourth cavity 22 which is connected to the first cavity 14, and an adjustment hole which connects the fourth cavity 22 and the second cavity 15. The large valve needle assembly 2 is installed in the valve body, and its lower end is sealed between the first cavity 14 and the second cavity 15. The small valve needle assembly 3 comprises a small valve needle 31 and a valve needle sleeve 32. The lower end of the small valve needle 31 is provided with a variable diameter adjustment section, which is installed in the adjustment hole. The valve needle sleeve 32 is sleeved on the upper end of the small valve needle 31 and is fixed to the lower end of the valve stem 4. When the valve stem 4 moves to the first position, it abuts against the small valve needle 31 to drive the small valve needle 31 to move upward, and when the valve stem 4 moves upward to the second position, it abuts against the large valve needle assembly 2 to drive the large valve needle assembly 2 to move upward. The height of the second position is greater than the height of the first position.

[0025] By adopting the above structure, the upper end of the valve stem 4 of the present application can be connected to the driving device and threadedly connected to the valve body. Through the action of the driving device, the valve stem 4 can be driven to move up and down in the valve body; when the valve is in a closed state, the lower end of the large valve needle 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 small 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 first 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 through the adjusting hole; the valve stem 4 continues to move upward to the second position, and 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; The large valve needle assembly 2 abuts against and drives the large valve needle assembly 2 to move upward, and the first cavity 14 is connected to the second cavity 15 to realize full passage of the valve, and the refrigerant or air can flow from the first cavity 14 into the second cavity 15; when the valve needs to be closed, the driving device rotates in the opposite direction to drive the valve stem 4 to move downward, and the large valve needle assembly 2 and the small valve needle assembly 3 move downward with the valve stem 4. When the valve stem 4 moves to the second position, the lower end of the large valve needle assembly 2 abuts against the lower valve seat 13 to close 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, so as to realize the closure of the valve and achieve 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, so as to realize the reverse use of the valve, relieve the pressure to the top of the valve body, and ensure that the refrigerant can only flow out from the large and small valve needle assemblies 3 during forward circulation, effectively ensuring the internal leakage problem of the product.

[0026] The valve body includes a catheter sleeve assembly 11, an upper valve seat 12 and a lower valve seat 13 which are connected in sequence from top to bottom. The first cavity 14 is arranged in the upper valve seat 12, and the second cavity 15 is arranged in the lower valve seat 13. A channel connected to the first cavity 14 is provided along the radial direction of the upper valve seat 12, and the refrigerant can flow into the first cavity 14 through the channel; a sealing surface is provided on the top of the lower valve seat 13, and the lower end of the large valve needle assembly 2 can be sealed on the sealing surface to disconnect the first cavity 14 and the second cavity 15.

[0027] The upper end of the valve stem 4 is threadedly connected to the catheter sleeve assembly 11 and 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 4 can move axially along the catheter sleeve assembly 11.

[0028] The large valve needle assembly 2 includes an upper valve core 23, a lower valve core 24, a valve core sleeve 25, a pressing plate 28, a valve core flat pad 26 and a valve core spring 27; the third cavity 21 is axially arranged along the upper end of the upper valve core 23, and the third cavity 21 is connected to the second cavity 15 through a plurality of first channels arranged vertically; the fourth cavity 22 is arranged in the lower valve core 24, and the fourth cavity 22 is connected to the first cavity 14 through a plurality of second channels arranged radially; the pressing plate 28 adopts PTF E pressure piece 28, whose sealing is arranged between the upper valve core 23 and the lower valve core 24, disconnects the third cavity 21 from the fourth cavity 22; the valve core sleeve 25 is fixed to the upper end of the upper valve core 23, and is sleeved outside the valve stem 4 to abut against the valve needle sleeve 32 when the valve stem 4 moves upward to the second position; the valve core flat pad 26 is arranged on the top of the valve core sleeve 25, and the valve core spring 27 is sleeved on the valve stem 4, and its upper end abuts against the guide tube sleeve assembly 11, and the lower end abuts against the large valve needle assembly 2.

[0029] 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 .

[0030] The small 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.

[0031] 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.

[0032] The above structure ensures 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 adjusting hole to the second cavity 15 when flowing in the forward direction; the third cavity 21 is always connected with 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, thereby realizing the reverse pressure relief effect of the valve.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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. A double-valve needle electronic expansion valve, comprising a valve body and a valve stem installed in the valve body, It is characterized in that It also includes a large valve needle assembly and a small valve needle assembly, and the lower end of the valve body is provided with a first cavity and a second cavity that are interconnected; The upper end of the large valve needle assembly is provided with a third cavity connected to the second cavity, the lower end is provided with a fourth cavity connected to the first cavity, and an adjustment hole connected to the fourth cavity and the second cavity, the large valve needle assembly is installed in the valve body, and the lower end thereof is blocked between the first cavity and the second cavity; The small valve needle assembly includes a small valve needle and a valve needle sleeve. The lower end of the small valve needle is provided with a variable diameter adjustment section, which is installed in the adjustment hole. The valve needle sleeve is sleeved on the upper end of the small valve needle and fixed to the lower end of the valve stem. When the valve stem moves to a first position, it abuts against the small valve needle to drive the small valve needle to move upward, and when the valve stem moves upward to a second position, it abuts against the large valve needle assembly to drive the large valve needle assembly to move upward. The height of the second position is greater than that of the first position.

2. The double-needle electronic expansion valve according to claim 1, It is characterized in that The valve body includes a catheter sleeve assembly, an upper valve seat and a lower valve seat connected in sequence from top to bottom, the first cavity is arranged in the upper valve seat, the second cavity is arranged in the lower valve seat, and a channel connected to the first cavity is arranged radially along the upper valve seat.

3. The double-needle electronic expansion valve according to claim 2, It is characterized in that The upper end of the valve stem is threadedly connected to the catheter sleeve assembly, and the upper end of the valve stem extends out of the upper end of the catheter sleeve assembly to be connected to a driving device.

4. The double-needle electronic expansion valve according to claim 3, It is characterized in that The large valve needle assembly includes an upper valve core, a lower valve core, a valve core sleeve and a pressing plate; the third cavity is axially arranged along the upper end of the upper valve core, and the third cavity is connected to the second cavity through a plurality of vertically arranged first channels; the fourth cavity is arranged in the lower valve core, and the fourth cavity is connected to the first cavity through a plurality of radially arranged second channels; the pressing plate is sealed and arranged between the upper valve core and the lower valve core; the valve core sleeve is fixed at the upper end of the upper valve core, and is sleeved outside the valve stem to abut against the valve needle sleeve when the valve stem moves upward to the second position.

5. The double-needle electronic expansion valve according to claim 4, It is characterized in that The large valve needle assembly also includes a valve core flat washer and a valve core spring. The valve core flat washer is arranged on the top of the valve core sleeve. The valve core spring is sleeved on the valve stem, with its upper end abutting against the guide tube sleeve assembly and its lower end abutting against the large valve needle assembly.

6. The double-needle electronic expansion valve according to claim 5, 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 double-needle electronic expansion valve according to claim 6, It is characterized in that The small 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 double-needle electronic expansion valve according to claim 7, 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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