Electronic expansion valve

Abstract

The utility model relates to the technical field of valves, in particular to an electronic expansion valve. The electronic expansion valve comprises a valve body and a first connecting pipe, the valve body is provided with a valve cavity, a valve port and mounting holes, the valve port and the mounting holes are communicated with the valve cavity, the valve port is formed in the axial end of the valve body, and the mounting holes are formed in the peripheral side of the valve body. The first connecting pipe is inserted into the mounting hole, the side, close to the valve port in the axial direction of the valve body, of the first connecting pipe is defined as a first side portion, a limiting portion is arranged on the inner wall of the mounting hole, the end of the first side portion abuts against the limiting portion, and a containing gap is formed between the end of the first side portion and the bottom wall of the mounting hole. According to the electronic expansion valve, the problem that when an existing electronic expansion valve connecting pipe and a valve body side hole are welded, welding flux overflows to the bottom wall of a valve cavity or even a valve port is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to an electronic expansion valve. BACKGROUND

[0002] The electronic expansion valve is a key component in the air conditioning system, which adjusts the flow of refrigerant by controlling the opening degree of the valve port in the electronic expansion valve, so as to realize the system function and achieve the purpose of accurate flow control.

[0003] In the related art, the welding strength of the high-pressure electronic expansion valve to the valve body and the connecting pipe is required to be high, so as to ensure that the welding material can fill the gap between the connecting pipe and the valve body, thereby meeting the certain pressure resistance strength. However, when the connecting pipe and the valve body side hole are welded, the bottom wall of the valve body side hole is usually directly contacted, which causes the welding material to overflow to the bottom wall of the valve cavity in the valve body, and even to the valve port, thereby affecting the sealing of the valve port. CONTENT OF THE UTILITY MODEL

[0004] Therefore, it is necessary to provide an electronic expansion valve to solve the problem that the welding material overflows to the bottom wall of the valve cavity or even the valve port when the connecting pipe and the valve body side hole are welded.

[0005] The present application provides an electronic expansion valve, which comprises a valve body and a first connecting pipe, the valve body has a valve cavity, a valve port and a mounting hole in communication with the valve cavity, the valve port is arranged at one end of the valve body along the axial direction, and the mounting hole is arranged on the circumferential side of the valve body; the first connecting pipe is inserted into the mounting hole, one side of the first connecting pipe close to the valve port along the axial direction of the valve body is defined as a first side, a limiting portion is arranged on the inner wall of the mounting hole, the end of the first side is in abutment with the limiting portion, and an accommodation gap is formed between the end of the first side and the bottom wall of the mounting hole.

[0006] In one embodiment, the width of the accommodation gap is d, and d is greater than or equal to 0.05mm.

[0007] In one embodiment, the limiting portion is partially protruded in the direction close to the axis of the mounting hole by the inner wall of the mounting hole.

[0008] In one embodiment, the limiting portion is arranged in an arc shape or an arch shape perpendicular to the cross section of the axial direction of the mounting hole.

[0009] In one embodiment, the end face of the limiting portion close to one end of the axis of the mounting hole is arranged in a plane, and the distance between the end face of the limiting portion close to one end of the axis of the mounting hole and the bottom wall of the valve cavity along the axial direction of the valve body is h, and 1.0mm≤h≤2.0mm.

[0010] In one of the embodiments, the maximum height of the limiting portion protruding from the inner wall of the mounting hole is H, and 0.3mm≤H≤1.0mm.

[0011] In one of the embodiments, the length of the first connecting pipe inserted into the mounting hole is T, and 2.5mm≤T≤5.0mm.

[0012] In one of the embodiments, the outer surface of the valve body is provided with a mounting surface, and one end of the mounting hole is at least partially provided on the mounting surface; wherein the mounting surface is provided in a plane.

[0013] In one of the embodiments, along the axial direction of the valve body, the inner wall of the first side portion near the side of the valve port is not lower than the bottom wall of the valve cavity.

[0014] In one of the embodiments, the electronic expansion valve further comprises a sleeve, a nut sleeve, a guide sleeve, a guide column, a valve core component and a rotor component, the sleeve is connected to one end of the valve body, and the nut sleeve is arranged in the sleeve and connected with the valve body; the guide sleeve is arranged at one end of the nut sleeve near the valve port and connected with the valve body, one end of the guide column is inserted into and connected with the nut sleeve, and the other end is inserted into and connected with the guide sleeve; one end of the valve core component penetrates the nut sleeve and is connected with the rotor component, and the other end penetrates the guide column and the guide sleeve in sequence and protrudes therefrom, and the valve core component can move along the axial direction towards or away from the valve port under the drive of the rotor component to adjust the flow at the valve port; wherein the guide column and the guide sleeve are both in sliding fit with part of the valve core component to guide the valve core component.

[0015] Compared with the prior art, the electronic expansion valve provided by the application can form an accommodation gap between the end of the first connecting pipe and the bottom wall of the mounting hole by arranging the limiting portion in the mounting hole and by abutting between the first connecting pipe and the limiting portion, so that the excess solder can be accumulated in the accommodation gap during the welding process, without continuing to flow, thereby reducing the risk of solder overflow onto the bottom wall plane of the valve cavity, and ensuring that no solder is accumulated at the valve port, improving the precision and reliability of the valve port, and effectively ensuring the sealing effect of the valve port. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1A cross-sectional view of an electronic expansion valve portion structure according to an embodiment of the present application;

[0018] Figure 2 A cross-sectional view of an electronic expansion valve according to an embodiment of the present application.

[0019] The symbols in the drawings represent the following meanings:

[0020] 100: electronic expansion valve; 10: valve body; 11: valve chamber; 12: mounting hole; 13: valve port; 14: accommodation gap; 15: mounting surface; 16: stopper; 20: first connector; 21: first side portion; 30: second connector; 40: sleeve; 50: nut sleeve; 60: guide sleeve; 70: guide post; 80: valve core member; 90: rotor member. DETAILED DESCRIPTION

[0021] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced without using some or all of these specific details, and that the present application is not limited to the specific embodiments disclosed below. In other instances, well-known methods, procedures and components have not been described in detail so as not to unnecessarily obscure aspects of the present application.

[0022] It is to be understood that when an element is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements can be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. It will also be understood that, when a term is used herein to describe a feature, it is intended to encompass both the feature and the absence of the feature. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0023] In addition, the terms "first", "second", etc. are used herein only to describe various elements, and do not imply or suggest relative importance or a number of the elements indicated. Thus, the features defined with "first", "second", etc. can include at least one of the features explicitly or implicitly. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0024] In the present application, unless specifically defined and limited otherwise, a first feature "on", "under", "below" a second feature can be that the first feature is in direct contact with the second feature, or the first feature is in indirect contact with the second feature through an intermediate medium. Moreover, the first feature "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "below", "under" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0025] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. The use of the terms "and / or" in the description of the present application includes any and all combinations of one or more of the associated listed items.

[0026] Electronic expansion valve is a key component in air conditioning system, which adjusts the flow of refrigerant by controlling the opening degree of valve port in electronic expansion valve, so as to realize system function and achieve the purpose of accurate flow control.

[0027] In the related art, the welding strength of high-pressure electronic expansion valve to valve body and connecting pipe is required to be high, and it is necessary to ensure that the welding material can fill the gap between the connecting pipe and the valve body, so as to meet a certain pressure resistance strength. However, at present, when the connecting pipe and the side hole of the valve body are welded, the bottom wall of the valve body side hole is usually directly contacted, which causes the welding material to overflow to the bottom wall of the valve cavity in the valve body, and even to the valve port, thereby affecting the sealing of the valve port.

[0028] Please refer to Figure 1 and Figure 2 To solve the problem that the welding material overflows to the valve cavity bottom wall or even the valve port when the connecting pipe and the valve body side hole of the existing electronic expansion valve are welded, the present application provides an electronic expansion valve 100, which comprises a valve body 10, a first connecting pipe 20 and a second connecting pipe 30. The valve body 10 has a valve cavity 11, a valve port 13 and a mounting hole 12 which communicate with the valve cavity 11. The valve port 13 is arranged at one end of the valve body 10 along the axial direction, and the mounting hole 12 is arranged on the circumferential side of the valve body 10. The first connecting pipe 20 is inserted into the mounting hole 12 and connected with the valve body 10, and the second connecting pipe 30 is arranged at the valve port 13 and connected with the valve body 10.

[0029] Here, the first pipe 20 and the second pipe 30 can be used as an inlet pipe and an outlet pipe of the electronic expansion valve 100, respectively. For example, refrigerant can flow from the first pipe 20 into the valve cavity 11 and flow out of the second pipe 30 through the valve port 13, or refrigerant can flow from the second pipe 30 into the valve cavity 11 through the valve port 13 and flow out of the first pipe 20. In this way, smooth flow of refrigerant is achieved.

[0030] When the valve body 10 and the first pipe 20 are welded, the solder is usually placed at the connection between the outer wall of the valve body 10 and the first pipe 20. Then, by heating and melting the solder, the solder can seep into the gap between the outer wall of the first pipe 20 and the inner wall of the mounting hole 12, thereby fixing the first pipe 20 and the valve body 10.

[0031] To prevent excessive overflow of the solder when the valve body 10 and the first pipe 20 are welded, in the present application, the side of the first pipe 20 close to the valve port 13 along the axis of the valve body 10 is defined as the first side 21, the inner wall of the mounting hole 12 is provided with a limiting portion 16, the end of the first side 21 abuts against the limiting portion 16, and a containing gap 14 is formed between the end of the first side 21 and the bottom wall of the mounting hole 12.

[0032] It can be understood that, in the present application, the limiting portion 16 is arranged in the mounting hole 12, and the abutment between the first pipe 20 and the limiting portion 16 enables the containing gap 14 to be formed between the end of the first pipe 20 and the bottom wall of the mounting hole 12. In this way, during the welding process, the excess solder can accumulate in the containing gap 14 without continuing to flow, thereby reducing the risk of the solder overflowing onto the bottom wall plane of the valve cavity 11 and ensuring that no solder accumulates at the valve port 13, which improves the accuracy and reliability of the valve port 13 and effectively ensures the sealing effect of the valve port 13.

[0033] It should be noted that the bottom wall of the valve cavity 11 is the inner wall of the valve cavity 11 close to the valve port 13 along the axis, and one end of the valve port 13 is open through the bottom wall of the valve cavity 11. The bottom wall of the mounting hole 12 is the inner wall of the mounting hole 12 close to the valve port 13, and the bottom wall of the mounting hole 12 forms a corner with the bottom wall of the valve cavity 11.

[0034] In an embodiment, the width of the containing gap 14 is d, and d≥0.05 mm. If d<0.05 mm, the width of the containing gap 14 is small, and the solder may overflow upward out of the containing gap 14 due to capillary action, resulting in accumulation of the solder on the bottom wall of the valve cavity 11 or even flowing to the position of the valve port 13. In the present embodiment, by setting d≥0.05 mm, the capillary action can be effectively prevented, and the containing effect of the containing gap 14 on the solder is ensured.

[0035] Alternatively, the value of d can be 0.05 mm, 0.07 mm, 0.09 mm, or 0.1 mm, etc.

[0036] Specifically, as shown in Figure 1 the limiting portion 16 is formed by the inner wall of the mounting hole 12 partially protruding towards the direction close to the axis of itself. That is, in this embodiment, the limiting portion 16 is a step structure formed by the protrusion of the inner wall of the mounting hole 12, which is simple in structure, easy to process, and can achieve reliable abutting effect on the first connecting pipe 20.

[0037] In addition, the connection between the limiting portion 16 and the inner wall of the mounting hole 12 can also be achieved by welding or clamping, etc.

[0038] In an embodiment, the shape of the limiting portion 16 perpendicular to the cross section of the axial direction of the mounting hole 12 is arc-shaped, so as to facilitate the processing of the limiting portion 16. At this time, the end face of the limiting portion 16 close to the axis of the mounting hole 12 is planar, which can ensure that the accommodation gap 14 has sufficient depth everywhere, thereby improving the accommodation effect of the solder.

[0039] Further, along the axial direction of the valve body 10, the spacing between the end face of the limiting portion 16 close to the axis of the mounting hole 12 and the bottom wall of the valve cavity 11 is h, and 1.0mm≤h≤2.0mm. If h<1.0mm, that is, the depth of the accommodation gap 14 is reduced, the accommodatable amount of solder in the accommodation gap 14 is reduced, and there is a risk of solder flowing out of the accommodation gap 14. If h>2.0mm, since the distance from the bottom wall of the valve cavity 11 to the inner wall of the mounting hole 12 is usually fixed along the axial direction, the increase of the accommodation gap 14 will reduce the protruding height of the limiting portion 16, thereby affecting the abutting effect of the first connecting pipe 20 and the limiting portion 16. In addition, if h is increased on the basis of ensuring the abutting effect of the first connecting pipe 20 and the limiting portion 16, it is easy to lead to cost increase.

[0040] Alternatively, the value of d can be 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm or 2.0mm, etc., which are not listed one by one here.

[0041] In another embodiment, the shape of the limiting portion 16 perpendicular to the cross section of the axial direction of the mounting hole 12 can also be arc-shaped, so as to ensure the uniformity of the stress when the limiting portion 16 contacts with the first connecting pipe 20, thereby ensuring the reliability of the abutting. But not limited to this, in other embodiments, the limiting portion 16 can also be arranged as a plurality of protruding structures spaced along the circumferential direction of the mounting hole 12, which can be reasonably arranged according to actual needs.

[0042] To further ensure the reliability of the abutment between the limiting portion 16 and the first connecting pipe 20, in an embodiment, the maximum height of the limiting portion 16 protruding from the inner wall of the mounting hole 12 is H, and 0.3mm≤H≤1.0mm. It is easy to understand that if H<0.3mm, the height of the limiting portion 16 protruding from the inner wall of the mounting hole 12 is small, which leads to a decrease in the contact area between the limiting portion 16 and the first connecting pipe 20, and cannot guarantee the reliability of the abutment between them. If H>1.0mm, the height of the limiting portion 16 protruding from the inner wall of the mounting hole 12 is large, which easily leads to insufficient size of the accommodating gap 14, affects the accommodating effect of the solder, or leads to an increase in the size of the valve body 10, thereby increasing the cost.

[0043] Alternatively, the value of H can be 0.3mm, 0.5mm, 0.7mm, 0.9mm or 1.0mm, etc., which are not listed one by one here.

[0044] In an embodiment, the length of the first connecting pipe 20 inserted into the mounting hole 12 is T, and 2.5mm≤T≤5.0mm. If the value of T is large, the solder cannot easily achieve complete penetration, which reduces the welding strength between the first connecting pipe 20 and the valve body 10, and easily leads to an excessive thickness of the valve body 10, thereby increasing the material cost. If the value of T is small, it is also difficult to meet the welding strength between the first connecting pipe 20 and the valve body 10, and the solder is more likely to flow out of the accommodating gap 14, affecting the sealing of the valve port 13.

[0045] Alternatively, the value of T can be 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm or 5.0mm, etc., which are not listed one by one here.

[0046] In the present embodiment, the valve body 10 and the valve port 13 are provided as an integrally formed structure, which facilitates the processing of the valve port 13, avoids separately providing a component part, reduces the installation process and reduces the cost.

[0047] Of course, in other embodiments, the valve body 10 and the valve port 13 can also be provided as a split structure to further reduce the influence on the valve port 13 when the first connecting pipe 20 and the valve body 10 are welded.

[0048] To facilitate the welding between the valve body 10 and the first connecting pipe 20, in an embodiment, the outer surface of the valve body 10 is provided with a mounting surface 15, and one end of the mounting hole 12 is at least partially provided on the mounting surface 15. Among them, the mounting surface 15 is provided as a plane. In this way, the mounting surface 15 provided as a plane is more easy to place a welding ring, thereby effectively improving the welding efficiency.

[0049] In an embodiment, as shown in Figure 1As shown, along the axial direction of the valve body 10, the inner wall of the first side portion 21 on the side close to the valve port 13 is not lower than the bottom wall of the valve cavity 11. In this way, the refrigerant flowing into the valve cavity 11 from the first connecting pipe 20 will not be hindered by the bottom wall of the mounting hole 12, so that the smooth flow of the refrigerant can be ensured.

[0050] In an embodiment, as shown in the drawings, Figure 2 The electronic expansion valve 100 further comprises a sleeve 40, a nut sleeve 50, a guide sleeve 60, a guide column 70, a valve core component 80 and a rotor component 90. The sleeve 40 is connected to one end of the valve body 10 and serves to protect the components in the sleeve 40. The nut sleeve 50 is arranged in the sleeve 40 and connected to the valve body 10. The guide sleeve 60 is arranged at one end of the nut sleeve 50 close to the valve port 13 and connected to the valve body 10. One end of the guide column 70 is inserted into and connected to the nut sleeve 50, and the other end is inserted into and connected to the guide sleeve 60.

[0051] Further, one end of the valve core component 80 is inserted into the nut sleeve 50 and connected to the rotor component 90, and the other end is sequentially inserted into and protrudes from the guide column 70 and the guide sleeve 60. The valve core component 80 can be driven by the rotor component 90 to move along the axial direction towards or away from the valve port 13 to adjust the flow at the valve port 13. The guide column 70 and the guide sleeve 60 are both in sliding fit with part of the valve core component 80 to guide the valve core component 80. In this way, the stability of the valve core component 80 during axial movement can be ensured.

[0052] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combinations of the technical features do not contradict, they should be considered within the scope of the present application.

[0053] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. An electronic expansion valve characterized by, The valve body (10) has a valve cavity (11) and a valve port (13) and a mounting hole (12) in communication with the valve cavity (11), the valve port (13) is arranged at one end of the valve body (10) along the axial direction, and the mounting hole (12) is arranged on the peripheral side of the valve body (10); The first connecting pipe (20) is inserted into the mounting hole (12), and the side of the first connecting pipe (20) close to the valve port (13) along the axial direction of the valve body (10) is defined as a first side (21), the inner wall of the mounting hole (12) is provided with a limiting portion (16), the end of the first side (21) abuts against the limiting portion (16), and the end of the first side (21) and the bottom wall of the mounting hole (12) form an accommodation gap (14).

2. The electronic expansion valve according to claim 1, characterized in that The width of the accommodation gap (14) is d, and d≥0.05mm.

3. The electronic expansion valve according to claim 1, wherein The limiting portion (16) is partially protruded from the inner wall of the mounting hole (12) towards the direction close to the axis thereof.

4. The electronic expansion valve according to claim 3, wherein The limiting portion (16) is arranged in an arc shape or an arcuate shape perpendicular to the cross section of the axial direction of the mounting hole (12).

5. The electronic expansion valve according to claim 4, characterized in that The end face of the limiting portion (16) close to one end of the axis of the mounting hole (12) is arranged in a plane, and the spacing between the end face of the limiting portion (16) close to one end of the axis of the mounting hole (12) and the bottom wall of the valve cavity (11) along the axial direction of the valve body (10) is h, and 1.0mm≤h≤2.0mm.

6. The electronic expansion valve according to claim 3, wherein The maximum height of the limiting portion (16) protruding from the inner wall of the mounting hole (12) is H, and 0.3mm≤H≤1.0mm.

7. The electronic expansion valve according to claim 1, wherein The length of the first connecting pipe (20) inserted into the mounting hole (12) is T, and 2.5mm≤T≤5.0mm.

8. The electronic expansion valve according to claim 1, wherein The outer surface of the valve body (10) is provided with a mounting surface (15), and one end of the mounting hole (12) is at least partially arranged on the mounting surface (15). The mounting surface (15) is arranged in a plane.

9. The electronic expansion valve of claim 1, wherein, The inner wall of the first side (21) close to the valve port (13) along the axial direction of the valve body (10) is not lower than the bottom wall of the valve cavity (11).

10. The electronic expansion valve according to claim 1, wherein The electronic expansion valve further comprises a sleeve (40), a nut sleeve (50), a guide sleeve (60), a guide column (70), a valve core component (80) and a rotor component (90), the sleeve (40) is connected to one end of the valve body (10), and the nut sleeve (50) is arranged in the sleeve (40) and connected with the valve body (10); The guide sleeve (60) is arranged at one end of the nut sleeve (50) close to the valve port (13) and connected with the valve body (10), one end of the guide column (70) is inserted into and connected with the nut sleeve (50), and the other end is inserted into and connected with the guide sleeve (60); One end of the valve core component (80) penetrates the nut sleeve (50) and is connected with the rotor component (90), the other end penetrates the guide column (70) and the guide sleeve (60) in turn and protrudes from the guide sleeve (60), and the valve core component (80) can be driven by the rotor component (90) to move in the axial direction to approach or away from the valve port (13) to adjust the flow at the valve port (13); Wherein, the guide column (70) and the guide sleeve (60) are both in sliding fit with part of the valve core component (80) to guide the valve core component (80).

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