Electronic expansion valve throttling mechanism and electronic expansion valve

Abstract

The present invention relates to the field of refrigerant flow control technology, and in particular to an electronic expansion valve throttling mechanism and an electronic expansion valve. The electronic expansion valve throttling mechanism includes: a valve needle and a valve seat, the valve needle is installed on the valve seat, and has a moving path along the axial direction of the valve seat; the valve needle includes a first valve needle section, a reducing section and a second valve needle section from top to bottom, and the interface between the first valve needle section and the reducing section is a first cross section; the bottom wall of the valve seat is provided with a fluid discharge port, the side wall of the valve seat is provided with a first refrigerant inlet hole and a second refrigerant inlet hole, the lower end face of the first refrigerant inlet hole is a first end face, a cavity is provided in the valve seat, the cavity is connected to the fluid discharge port, the cavity is connected to the second refrigerant inlet hole through a first channel, the cavity is connected to the first refrigerant inlet hole through a second channel, and the valve needle moves along the extension direction of the second channel to block or open the second channel. The single electronic expansion valve provided by the present invention can realize large and small flow throttling control, and has a high degree of modularization and low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerant flow control, and particularly to a throttling mechanism of an electronic expansion valve and an electronic expansion valve. Background Art

[0002] In order to provide a better driving experience for new energy vehicle users, in the refrigerant circuit of a new energy air conditioning system, different refrigerant flow rates are required under different working conditions. That is, in the refrigerant circuit of a new energy air conditioning system, both small flow control and large flow control are needed to achieve different refrigeration purposes. In the prior art, for the requirement that the refrigerant circuit of an air conditioning system needs both small flow refrigerant control and large flow refrigerant control, usually two parallel valves are set up. One path has a small flow regulating valve, and the other path has a large flow regulating valve. However, such a setting not only requires multiple valves for control, resulting in high costs, but also occupies a large space. Summary of the Invention

[0003] The purpose of the present invention is to provide a throttling mechanism of an electronic expansion valve and an electronic expansion valve to alleviate the problems of high cost and large space occupation in the prior art of using two parallel valves to achieve refrigerant large and small flow control.

[0004] To solve the above technical problems, the technical solution provided by the present invention is as follows:

[0005] In a first aspect, the present invention provides a throttling mechanism of an electronic expansion valve, including: a valve needle and a valve seat. The valve needle is installed on the valve seat and has a moving path along the axis direction of the valve seat;

[0006] The valve needle includes a first valve needle section and a second valve needle section from top to bottom. The diameter of the first valve needle section is larger than that of the second valve needle section, and the interface between the first valve needle section and the second valve needle section is a first cross-section;

[0007] The valve seat includes a first valve seat section and a second valve seat section. The diameter of the first valve seat section decreases from top to bottom. The diameter of the second valve seat section is the same as the diameter at the bottom of the first valve seat section. The diameter of the first valve needle section is the same as that of the second valve seat section. The interface between the first valve seat section and the second valve seat section is a second cross-section. The top of the first valve seat section forms a first end face, and the bottom of the second valve seat section forms a second end face. The first end face is provided with a first throttling discharge port axially penetrating the valve seat, and the second end face is provided with a second throttling discharge port axially penetrating the valve seat. The side of the second valve seat section is provided with a refrigerant inlet hole;

[0008] When the position of the bottom surface of the second valve needle section is not higher than that of the second end surface or the position of the first cross-section is not higher than that of the second cross-section, the electronic expansion valve is in the first working condition; when the position of the bottom surface of the second valve needle section is higher than that of the second end surface or the position of the first cross-section is higher than that of the second cross-section, the electronic expansion valve is in the second working condition.

[0009] Furthermore, the first valve needle section and the second valve needle section are integrally formed or connected by segmented welding.

[0010] Furthermore, a sealing groove is provided at the bottom of the first valve needle section, and a valve needle sealing ring is installed in the sealing groove.

[0011] Furthermore, a sealing gasket groove is provided at the bottom of the second valve seat section, a sealing gasket is installed in the sealing gasket groove, and the sealing gasket is connected to the second valve seat section through a gasket.

[0012] Furthermore, a rotor assembly is connected to the upper end surface of the first valve needle section, and the rotation of the rotor assembly drives the valve needle to move along the axis direction of the valve seat.

[0013] Furthermore, a first valve seat sealing groove is provided on the outer wall of the valve seat at the first end surface, and a first valve seat sealing ring is installed in the first valve seat sealing groove.

[0014] Furthermore, a second valve seat sealing groove is provided on the outer wall of the valve seat at the second end surface, and a second valve seat sealing ring is installed in the second valve seat sealing groove.

[0015] Furthermore, the outlet of the second throttle row is located at the center of the bottom surface of the valve seat, and the outlet of the first throttle row is provided in the circumferential direction of the outlet of the second throttle row.

[0016] Furthermore, there are multiple outlets of the first throttle row and they are evenly distributed in the circumferential direction of the outlet of the second throttle row.

[0017] In a second aspect, the present invention provides an electronic expansion valve, including the electronic expansion valve throttling mechanism described in the first aspect.

[0018] The embodiments of the present invention bring the following beneficial effects:

[0019] Since the present invention provides an electronic expansion valve throttling mechanism, comprising: a valve needle and a valve seat, the valve needle is installed on the valve seat and has a moving path along the axis direction of the valve seat; the valve needle includes a first valve needle section, a diameter-changing section and a second valve needle section from top to bottom, the diameter of the diameter-changing section gradually decreases from top to bottom, and the interface between the first valve needle section and the diameter-changing section is a first cross-section; a fluid discharge port axially penetrating the valve seat is provided on the bottom wall of the valve seat, a first refrigerant inlet hole and a second refrigerant inlet hole are provided on the side wall of the valve seat, the first refrigerant inlet hole is located above the second refrigerant inlet hole, the lower end surface of the first refrigerant inlet hole is a first end surface, a cavity is provided in the valve seat, the cavity is communicated with the fluid discharge port, the cavity is communicated with the second refrigerant inlet hole through a first channel, the cavity is communicated with the first refrigerant inlet hole through a second channel, and the valve needle moves along the extending direction of the second channel to block or open the second channel; when the position of the first cross-section is not higher than the first end surface, the electronic expansion valve is in a first working condition; when the position of the first cross-section is higher than the first end surface, the electronic expansion valve is in a second working condition.

[0020] The refrigerant flows into the valve body from the first refrigerant inlet hole and the second refrigerant inlet hole, and the valve needle moves along the axis direction of the valve seat. When the position of the first cross-section is not higher than the first end surface, the valve needle blocks the second channel, and the refrigerant can only flow into the valve body from the second refrigerant inlet hole, flow into the cavity through the first channel, and finally flow out from the fluid discharge port, realizing the first working condition of small flow control of the electronic expansion valve. When the position of the first cross-section is higher than the first end surface, the second channel is opened, and the refrigerant not only flows into the valve body from the second refrigerant inlet hole, flows into the cavity through the first channel, but also simultaneously flows into the valve body from the first refrigerant inlet hole, flows into the cavity through the second channel, and finally flows out from the fluid discharge port, thereby realizing the second working condition of large flow control of the electronic expansion valve. By moving the valve needle along the axis direction of the valve seat, the adjustment and control of large and small flows are realized, the structure is simple, the manufacturability is strong, a single electronic expansion valve can realize the throttling control of large and small flows, and the modularization degree is high and the cost is low.

[0021] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes a detailed description as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the related art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 Schematic diagram of the electronic expansion valve provided by an embodiment of the present invention;

[0024] Figure 2 is Figure 1 a cross-sectional view;

[0025] Figure 3 Schematic diagram of the structure of the bottom surface of the valve seat;

[0026] Figure 4 Cross-sectional view of the limit position of the valve needle under the first working condition provided by an embodiment of the present invention;

[0027] Figure 5 Cross-sectional view of the limit position of the valve needle under the second working condition provided by an embodiment of the present invention;

[0028] Figure 6 Cross-sectional view of the electronic expansion valve provided by another embodiment of the present invention;

[0029] Figure 7 Schematic diagram of the structure of the side surface of the valve seat;

[0030] Figure 8 Schematic diagram of the structure of the fluid discharge port provided by an embodiment of the present invention Figure 1 ;

[0031] Figure 9 Schematic diagram of the structure of the fluid discharge port provided by an embodiment of the present invention Figure 2 ;

[0032] Figure 10 Schematic diagram of the structure of the fluid discharge port provided by an embodiment of the present invention Figure 3 .

[0033] Icon:

[0034] 1-valve needle; 11-first cross-section; 2-valve seat; 21-fluid discharge port; 211-second end face; 22-first refrigerant inlet hole; 221-first end face; 23-second refrigerant inlet hole; 24-cavity; 25-first channel; 26-second channel; 3-valve needle sealing ring; 4-rotor assembly; 41-connecting piece; 5-fixing piece. Detailed implementation manners

[0035] Next, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] It should be noted that like reference numerals and letters refer to like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0037] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention 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 should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. Physical quantities in formulas, unless otherwise separately marked, should be understood as the basic quantities of the basic units of the International System of Units, or derived quantities derived from the basic quantities through mathematical operations such as multiplication, division, differentiation, or integration.

[0038] In addition, terms such as "horizontal", "vertical", "hanging" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0039] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0040] The following will describe in detail some embodiments of the present invention with reference to the drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other. Among them, Figure 1 is a schematic diagram of an electronic expansion valve provided by an embodiment of the present invention; Figure 2 is Figure 1 a cross-sectional view of

[0041] Figure 3 a schematic structural diagram of the bottom surface of the valve seat; Figure 4 is a cross-sectional view of the limit position of the valve needle under the first working condition provided by an embodiment of the present invention; Figure 5 is a cross-sectional view of the limit position of the valve needle under the second working condition provided by an embodiment of the present invention; Figure 6 is a cross-sectional view of an electronic expansion valve provided by another embodiment of the present invention; Figure 7Schematic structural diagram of the side of the valve seat; Figure 8 Schematic structural diagram of the fluid discharge port provided by the embodiment of the present invention Figure 1 ; Figure 9 Schematic structural diagram of the fluid discharge port provided by the embodiment of the present invention Figure 2 ; Figure 10 Schematic structural diagram of the fluid discharge port provided by the embodiment of the present invention Figure 3 .

[0042] Embodiment 1

[0043] In the prior art, to meet the requirements of both small-flow refrigerant control and large-flow refrigerant control in the refrigerant circuit of an air-conditioning system, usually two parallel valves are set up. One path is equipped with a small-flow regulating valve, and the other path is equipped with a large-flow regulating valve. However, such a setting not only requires multiple valves for control, resulting in high costs, but also occupies a large space.

[0044] In view of this, the embodiment of the present invention provides an electronic expansion valve throttling mechanism, including: a valve needle 1 and a valve seat 2. The valve needle 1 is installed on the valve seat 2 and has a moving path along the axis direction of the valve seat 2. The valve needle 1 includes a first valve needle section, a diameter-changing section, and a second valve needle section from top to bottom. The diameter of the diameter-changing section gradually decreases from top to bottom. The interface between the first valve needle section and the diameter-changing section is a first cross-section 11. The bottom wall of the valve seat 2 is provided with a fluid discharge port 21 that axially penetrates the valve seat 2. The side wall of the valve seat 2 is provided with a first refrigerant inlet hole 22 and a second refrigerant inlet hole 23. The first refrigerant inlet hole 22 is located above the second refrigerant inlet hole 23. The lower end surface of the first refrigerant inlet hole 22 is a first end surface 221. A cavity 24 is provided in the valve seat 2. The cavity 24 is connected to the fluid discharge port 21. The cavity 24 is connected to the second refrigerant inlet hole 23 through a first channel 25. The cavity 24 is connected to the first refrigerant inlet hole 22 through a second channel 26. The valve needle 1 moves along the extension direction of the second channel 26 to block or open the second channel 26. When the position of the first cross-section 11 is not higher than the first end surface 221, the electronic expansion valve is in the first working condition. When the position of the first cross-section 11 is higher than the first end surface 221, the electronic expansion valve is in the second working condition.

[0045] Please refer to Figures 1 to 3, the second end face 211 of the valve seat 2 is provided with a fluid discharge port 21. The refrigerant flows into the valve body from the first refrigerant inlet hole 22 and the second refrigerant inlet hole 23. The valve needle 1 moves along the axis direction of the valve seat 2. When the position of the first cross-section 11 is not higher than the first end face 221, the valve needle 1 blocks the second channel 26, and the refrigerant can only flow into the valve body from the second refrigerant inlet hole 23, flow into the cavity 24 through the first channel 25, and finally flow out from the fluid discharge port 21, realizing the first working condition of the small-flow control of the electronic expansion valve. When the position of the first cross-section 11 is higher than the first end face 221, the second channel 26 is opened. The refrigerant not only flows into the valve body from the second refrigerant inlet hole 23, flows into the cavity 24 through the first channel 25, but also simultaneously flows into the valve body from the first refrigerant inlet hole 22, flows into the cavity 24 through the second channel 26, and finally all flow out from the fluid discharge port 21, thereby realizing the second working condition of the large-flow control of the electronic expansion valve. By moving the valve needle 1 along the axis direction of the valve seat 2, the adjustment control of large and small flows is realized. The structure is simple, the manufacturability is strong, a single electronic expansion valve can realize the throttling control of large and small flows, and the modularization degree is high and the cost is low.

[0046] Figure 4 The limit position of the valve needle 1 in the first working condition is shown. At this time, the position of the first cross-section 11 is just located at the first end face 221. The valve needle 1 blocks the second channel 26. The refrigerant can only flow into the valve body from the second refrigerant inlet hole 23, flow into the cavity 24 through the first channel 25, and finally flow out from the fluid discharge port 21. The valve needle 1 moves to the limit position of the small-flow control of the electronic expansion valve. Figure 5 The limit position of the valve needle 1 in the second working condition is shown. At this time, the position of the first cross-section 11 exceeds the first end face 221, and the second channel 26 is opened. The refrigerant not only flows into the valve body from the second refrigerant inlet hole 23, flows into the cavity 24 through the first channel 25, but also simultaneously flows into the valve body from the first refrigerant inlet hole 22, flows into the cavity 24 through the second channel 26, and finally all flow out from the fluid discharge port 21. Due to the limiting effect of the fixing part 5, the valve needle 1 moves to the limit position of the large-flow control of the electronic expansion valve.

[0047] In an optional manner of this embodiment, the first valve needle section, the reduced-diameter section and the second valve needle section are integrally formed or connected by segmented welding.

[0048] The first valve needle section, the reduced-diameter section and the second valve needle section can either be integrally formed or connected by the method of segmented welding of large diameter and small diameter, so as to ensure the stable connection of the first valve needle section, the reduced-diameter section and the second valve needle section during the axial movement of the valve needle 1 along the valve seat 2 and increase the service life.

[0049] In an optional manner of this embodiment, a sealing groove is provided at the bottom of the first valve needle section, and a valve needle sealing ring 3 is installed in the sealing groove.

[0050] Please refer to Figure 2, The valve needle seal ring 3 is arranged at the junction of the first valve needle section and the reduced-diameter section, that is, at the first cross-section 11, which can ensure the sealing performance of the valve needle 1. And the position of the sealing surface of the valve needle seal ring 3 can be used to judge whether the electronic expansion valve is in the first working condition or the second working condition. When the position of the sealing surface of the valve needle seal ring 3 is not higher than the first end face 221, the electronic expansion valve is in the first working condition of small flow control; when the position of the sealing surface of the valve needle seal ring 3 is higher than the first end face 221, the electronic expansion valve is in the second working condition of large flow control.

[0051] In addition, according to different technical requirements, different implementation manners can also be adopted. Please refer to Figure 6 . By not setting the valve needle seal ring 3, the manufacturing cost can be reduced, and the flow control of the electronic expansion valve and related technical requirements can also be achieved.

[0052] In an alternative embodiment of the present embodiment, the upper end face of the first valve needle section is connected with a rotor assembly 4, and the rotation of the rotor assembly 4 drives the valve needle 1 to move along the axis direction of the valve seat 2.

[0053] Furthermore, the rotor assembly 4 includes a connecting member 41 connected to the first valve needle section, and the valve seat 2 is provided with a fixing member 5, and the fixing member 5 is used to limit the maximum height of the upward movement of the connecting member 41.

[0054] During the movement of the valve needle 1 along the axis direction of the valve seat 2, when the upper end face of the connecting member 41 abuts against the lower end face of the fixing member 5, that is, the limit position of the valve needle 1 under the second working condition shown in Figure 5 is reached, and the valve needle 1 cannot move upward any more.

[0055] In an alternative embodiment of the present embodiment, please refer to Figure 1 and Figure 7 , a plurality of first refrigerant inlet holes 22 are provided along the circumferential direction of the side wall of the valve seat 2, and a plurality of second refrigerant inlet holes 23 are provided along the circumferential direction of the side wall of the valve seat 2, and the plurality of first refrigerant inlet holes 22 and the plurality of second refrigerant inlet holes 23 are both evenly distributed along the circumferential direction of the side wall of the valve seat 2.

[0056] The first refrigerant inlet holes 22 and the second refrigerant inlet holes 23 on the side of the valve seat 2 can both be set to different shapes, and both are provided with N channels (N is a natural number greater than or equal to 0) to enable the refrigerant to enter the valve seat 2 from different directions on the side wall of the valve seat 2 at the same time, improving the efficiency.

[0057] Correspondingly, please refer to Figures 8 to 10 , a plurality of fluid discharge ports 21 are provided and are evenly distributed along the circumferential direction of the bottom wall of the valve seat 2.

[0058] According to different technical requirements, the fluid discharge ports 21 can be set to different shapes, and the number of channels of the fluid discharge ports 21 is set to N (N is a natural number greater than or equal to 0). It can be Figure 8The two arc-shaped fluid outlets 21 shown in Figure 9 The four elliptical fluid outlets 21 shown in Figure 10 The five sector-shaped fluid outlets 21 shown in. Of course, the specific shape and the number of channels are not limited, and only the machined valve seat 2 needs to be processed with different sizes to meet the requirements. The shape of the fluid outlet 21 and the number of channels can be freely combined with the aforementioned sealing methods according to needs.

[0059] Embodiment 2

[0060] The embodiment of the present invention provides an electronic expansion valve, including the electronic expansion valve throttling mechanism described in Embodiment 1.

[0061] The electronic expansion valve provided in this embodiment has a simple structure, strong manufacturability, can achieve throttling control of large and small flows with a single electronic expansion valve, and has a high degree of modularization and low cost.

[0062] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and 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 present invention.

Claims

1. An electronic expansion valve throttling mechanism, characterized in that: include: A valve needle and a valve seat, wherein the valve needle is mounted on the valve seat and has a moving path along the axis direction of the valve seat; The valve needle comprises a first valve needle section, a diameter-reducing section and a second valve needle section from top to bottom, the diameter of the diameter-reducing section gradually decreases from top to bottom, and the interface between the first valve needle section and the diameter-reducing section is a first cross section; The bottom wall of the valve seat is provided with a fluid discharge port which penetrates the valve seat axially, and the side wall of the valve seat is provided with a first refrigerant inlet hole and a second refrigerant inlet hole, the first refrigerant inlet hole is located above the second refrigerant inlet hole, and the lower end face of the first refrigerant inlet hole is the first end face, a cavity is provided in the valve seat, the cavity is connected with the fluid discharge port, the cavity is connected with the second refrigerant inlet hole through a first channel, and the cavity is connected with the first refrigerant inlet hole through a second channel, and the valve needle moves along the extension direction of the second channel to block or open the second channel; When the position of the first cross section is not higher than the first end surface, the electronic expansion valve is in a first working condition; when the position of the first cross section is higher than the first end surface, the electronic expansion valve is in a second working condition.

2. The electronic expansion valve throttling mechanism according to claim 1, characterized in that: The first valve needle segment, the diameter-changing segment and the second valve needle segment are integrally formed or welded in sections.

3. The electronic expansion valve throttling mechanism according to claim 2, characterized in that: A sealing groove is provided at the bottom of the first valve needle section, and a valve needle sealing ring is installed in the sealing groove.

4. The electronic expansion valve throttling mechanism according to claim 1, characterized in that: The upper end surface of the first valve needle segment is connected to a rotor assembly, and the rotation of the rotor assembly drives the valve needle to move along the axial direction of the valve seat.

5. The electronic expansion valve throttling mechanism according to claim 4, characterized in that: The rotor assembly includes a connecting piece connected to the first valve needle segment, and the valve seat is provided with a fixing piece, and the fixing piece is used to limit the maximum height to which the connecting piece rises.

6. The electronic expansion valve throttling mechanism according to claim 1, characterized in that: A plurality of first refrigerant inlet holes are provided along the circumferential direction of the valve seat side wall.

7. The electronic expansion valve throttling mechanism according to claim 6, characterized in that: A plurality of second refrigerant inlet holes are provided along the circumferential direction of the valve seat side wall.

8. The electronic expansion valve throttling mechanism according to claim 7, characterized in that: The plurality of first refrigerant inlet holes and the plurality of second refrigerant inlet holes are uniformly distributed along the circumference of the valve seat side wall.

9. The electronic expansion valve throttling mechanism according to claim 1, characterized in that: The fluid outlets are provided in plurality and are evenly distributed along the circumference of the bottom wall of the valve seat.

10. An electronic expansion valve, characterized in that: It comprises the electronic expansion valve throttling mechanism as described in any one of claims 1-9.

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