Bidirectional throttle valve

Abstract

The utility model relates to the technical field of valves, in particular to a two-way throttle valve. The two-way throttle valve comprises a valve pipe, a communicating piece, a first valve element assembly and a second valve element assembly. The communicating piece is installed in the valve pipe and divides the interior of the valve pipe into a first valve cavity and a second valve cavity, the first valve element assembly is arranged in the first valve cavity, the second valve element assembly is arranged in the second valve cavity, and the first valve element assembly and the second valve element assembly are in laser welding with the communicating piece. A first valve port is formed in the end, facing the communicating piece, of the first valve element assembly, a second valve port is formed in the end, facing the communicating piece, of the second valve element assembly, the first valve element assembly communicates with the second valve cavity through the first valve port and the communicating piece, and the second valve element assembly communicates with the first valve cavity through the second valve port and the communicating piece. According to the two-way throttle valve, the problem that connection between an existing throttle valve assembly and a communicating piece greatly influences the flow adjusting precision of the two-way throttle valve is solved.

Description

Technical Field

[0001] The present application relates to the field of valve technology, and in particular to a two-way throttle valve. Background Art

[0002] Two-way throttle valves are often used in air-conditioning systems. They use two throttle valve components connected in parallel or in series to achieve two-way circulation of refrigerant while adjusting the refrigerant flow rate.

[0003] In the related art, the two-way throttle valve also includes a connecting piece arranged between two throttle valve assemblies, and the two throttle valve assemblies are provided with valve ports at one end facing the connecting piece, and the two throttle valve assemblies are respectively welded and fixed to the connecting piece. Since the connecting piece and the throttle valve assembly are mostly brass parts, and the welding between the brass parts is often flame welding or tunnel furnace welding, the heat generated during welding has a large impact, resulting in large fluctuations in the size of the parts, and the valve port is prone to deformation during welding, which greatly affects the adjustment accuracy of the refrigerant flow. Utility Model Content

[0004] Based on this, it is necessary to provide a two-way throttle valve to solve the problem that the connection between the existing throttle valve assembly and the connecting piece has a significant impact on the flow regulation accuracy of the two-way throttle valve.

[0005] The present application provides a two-way throttle valve, which includes a valve tube, a connecting piece, a first valve core assembly and a second valve core assembly, the connecting piece is installed in the valve tube and divides the interior of the valve tube into a first valve cavity and a second valve cavity, the first valve core assembly is arranged in the first valve cavity, the second valve core assembly is arranged in the second valve cavity, and the first valve core assembly and the second valve core assembly are laser welded to the connecting piece respectively; wherein, the first valve core assembly is provided with a first valve port toward one end of the connecting piece, the second valve core assembly is provided with a second valve port toward one end of the connecting piece, the first valve core assembly is connected to the second valve cavity through the first valve port and the connecting piece, and the second valve core assembly is connected to the first valve cavity through the second valve port and the connecting piece.

[0006] In one embodiment, the connecting piece is provided with a first assembly hole, the first valve core assembly includes a first valve seat and a first boss, along the axial direction of the first valve core assembly, the first boss protrudes and is connected to one end of the first valve seat, and the first boss is inserted into the first assembly hole and connected to the first assembly hole; wherein the height of the first boss is less than the depth of the first assembly hole.

[0007] In one embodiment, the first boss is provided with a first connecting hole, the first valve seat is provided with a first accommodating hole and a first opening, one end of the first accommodating hole is connected to the first connecting hole through the first valve port, and the other end is connected to the first valve cavity through the first opening; the first valve core assembly also includes a first valve core, and the first valve core is movably disposed in the first accommodating hole for opening / closing the first valve port.

[0008] In one embodiment, along the axial direction of the first valve core assembly, the depth h1 of the first communicating hole and the height h2 of the first boss satisfy h1>h2.

[0009] In one embodiment, the outer wall of the first valve seat and the inner wall of the first valve cavity are spaced apart and clamped to form a first gap flow channel, and a flow hole is opened on the side wall of the first valve seat, and the two ends of the flow hole are respectively connected to the first accommodating hole and the first gap flow channel; and / or, the outer wall of the first valve core is provided with a flow surface, and the flow surface and the inner wall of the first accommodating hole are spaced apart.

[0010] In one embodiment, the first valve core assembly also includes a limiting structure, which is arranged at the first opening and connected to the first valve seat; when the first valve core moves to the first opening, the limiting structure can stop the first valve core to prevent the first valve core from moving in a direction away from the first valve port.

[0011] In one embodiment, one end of the limiting structure is connected to the first valve seat, and the other end is contracted toward the direction close to the center line of the first valve seat; or, the limiting structure is configured as a limiting pin, the first valve seat has a limiting hole, the limiting pin is inserted into the limiting hole and connected to the first valve seat, and at least a portion of the limiting pin is disposed in the first accommodating hole.

[0012] In one embodiment, the outer side wall of the first boss and the inner side wall of the first assembly hole are interference fit.

[0013] In one embodiment, the connecting piece is further provided with a second assembly hole, and the second valve core assembly includes a second valve seat and a second boss, and along the axial direction of the second valve core assembly, the second boss protrudes and is connected to one end of the second valve seat, and the second boss is inserted into the second assembly hole and connected to the second assembly hole, and the height of the second boss is less than the depth of the second assembly hole; wherein, the second boss is provided with a second connecting hole connected to the second valve port, and along the axial direction of the second valve core assembly, the depth of the second connecting hole is h3, and the height of the second boss is h4, satisfying h3>h4.

[0014] In one embodiment, the second valve seat is provided with a second accommodating hole and a second opening, one end of the second accommodating hole is connected to the second communicating hole through the second valve port, and the other end is connected to the second valve cavity through the second opening; the second valve core assembly also includes a second valve core, an elastic member and a head, the head is arranged at the second opening and connected to the second valve seat, the second valve core and the elastic member are arranged in the second accommodating hole, and one end of the second valve core is connected to the head through the elastic member, and the other end is movably cooperated with the second valve port to adjust the flow rate at the second valve port.

[0015] Compared with the prior art, in the two-way throttle valve provided in the present application, both the first valve core assembly and the second valve core assembly are welded and fixed to the connecting piece by laser welding. Compared with traditional flame welding or furnace welding processes, laser welding can greatly reduce the dimensional deformation caused by heat effects, thereby effectively ensuring the dimensional accuracy of each component after welding, especially the valve mouth will not be deformed due to welding. This is conducive to improving the precision adjustment effect of the two-way throttle valve on the refrigerant flow, thereby achieving a better heat exchange effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A cross-sectional view of a two-way throttle valve according to an embodiment of the present application;

[0018] Figure 2 A cross-sectional view of the matching structure of the first valve core assembly, the second valve core assembly and the connecting piece according to an embodiment of the present application;

[0019] Figure 3 A cross-sectional view of a first valve seat according to an embodiment of the present application;

[0020] Figure 4 A cross-sectional view of a connecting piece according to an embodiment of the present application;

[0021] Figure 5 A schematic structural diagram of a first valve seat according to an embodiment of the present application;

[0022] Figure 6 A cross-sectional view of a first valve core assembly according to an embodiment of the present application;

[0023] Figure 7A schematic structural diagram of a first valve core according to an embodiment of the present application;

[0024] Figure 8 A schematic structural diagram of a first valve core according to another embodiment of the present application;

[0025] Fig. 9 A cross-sectional view of a second valve seat according to an embodiment of the present application.

[0026] The symbols in the figure mean the following:

[0027] 100, two-way throttle valve; 10, valve tube; 11, first valve cavity; 111, first gap flow channel; 12, second valve cavity; 121, second gap flow channel; 20, connecting piece; 21, first assembly hole; 22, second assembly hole; 23, first channel; 24, second channel; 30, first valve core assembly; 301, first connecting hole; 302, first valve port; 303, first accommodating hole; 304, first opening; 305, flow hole; 306, limiting hole; 31, first valve seat; 32, first boss; 33, first valve core; 331, flow surface; 34, limiting structure; 40, second valve core assembly; 401, second connecting hole; 402, second valve port; 403, second accommodating hole; 404, second opening; 41, second valve seat; 42, second boss; 43, second valve core; 44, elastic piece; 45, end cap. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0029] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are in contact indirectly through an intermediate medium. Moreover, a first feature being “above”, “above”, or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0033] Two-way throttle valves are often used in air-conditioning systems. They use two throttle valve components connected in parallel or in series to achieve two-way circulation of refrigerant while adjusting the refrigerant flow rate.

[0034] In the related art, the two-way throttle valve also includes a connecting piece arranged between the two throttle valve assemblies, and the connecting piece is respectively welded and fixed to the two throttle valve assemblies. Since the connecting piece and the throttle valve assembly are mostly brass parts, and the welding between the brass parts is often flame welding or tunnel furnace welding, the heat generated during welding has a large impact, resulting in large fluctuations in the size of the parts, which greatly affects the adjustment accuracy of the refrigerant flow.

[0035] See also Figure 1-Figure 9In order to solve the problem that the connection between the existing throttle valve assembly and the connecting piece has a great influence on the flow regulation accuracy of the two-way throttle valve, the present application provides a two-way throttle valve 100, which can be used in an air-conditioning system. Specifically, the two-way throttle valve 100 includes a valve pipe 10, a connecting piece 20, a first valve core assembly 30 and a second valve core assembly 40. The connecting piece 20 is installed in the valve pipe 10 and divides the interior of the valve pipe 10 into a first valve cavity 11 and a second valve cavity 12. The first valve core assembly 30 is arranged in the first valve cavity 11, and the second valve core assembly 40 is arranged in the second valve cavity 12. In addition, the first valve core assembly 30 and the second valve core assembly 40 are laser welded to the connecting piece 20 respectively. Among them, the first valve core assembly 30 is provided with a first valve port 302 at one end facing the connecting piece 20, and the second valve core assembly 40 is provided with a second valve port 402 at one end facing the connecting piece 20. The first valve core assembly 30 is connected to the second valve cavity 12 through the first valve port 302 and the connecting piece 20, and the second valve core assembly 40 is connected to the first valve cavity 11 through the second valve port 402 and the connecting piece 20.

[0036] The first valve core assembly 30 and the second valve core assembly 40 provided in the present application are both welded and fixed to the connecting piece 20 by laser welding. Compared with traditional flame welding or furnace welding processes, laser welding can greatly reduce the dimensional deformation caused by heat effects, thereby effectively ensuring the dimensional accuracy of each component after welding, especially the valve mouth will not be deformed due to welding. This is conducive to improving the precision adjustment effect of the two-way throttle valve 100 on the refrigerant flow, thereby achieving a better heat exchange effect.

[0037] In one embodiment, if Figure 2-Figure 4 As shown, the connecting piece 20 is provided with a first assembly hole 21, and the first valve core assembly 30 includes a first valve seat 31 and a first boss 32. Along the axial direction of the first valve core assembly 30, the first boss 32 protrudes and is connected to one end of the first valve seat 31, and the first boss 32 is inserted into the first assembly hole 21 and connected to the first assembly hole 21, wherein the height of the first boss 32 is less than the depth of the first assembly hole 21.

[0038] It can be understood that the provision of the first boss 32 facilitates the positioning of the first valve core assembly 30 and the connecting piece 20, thereby facilitating the subsequent welding operation and improving the welding efficiency of the first valve core assembly 30 and the connecting piece 20. In addition, when the first boss 32 is inserted into the first assembly hole 21, since the height of the first boss 32 is less than the depth of the first assembly hole 21, the end surface of the first valve seat 31 can abut against the end surface of the connecting piece 20, that is, there is no gap between the two welding surfaces of the first valve core assembly 30 and the connecting piece 20 for laser welding, so that the welding effect of the laser welding between the first valve core assembly 30 and the connecting piece 20 can be guaranteed.

[0039] Specifically, in this embodiment, the first valve seat 31 and the first boss 32 are an integrally formed structure to reduce assembly steps and improve the overall structural strength.

[0040] Further, in one embodiment, if Figure 2 and Figure 3 As shown, the first boss 32 is provided with a first connecting hole 301 connected to the first valve port 302. Along the axial direction of the first valve core assembly 30, the depth h1 of the first connecting hole 301 and the height h2 of the first boss 32 satisfy h1>h2. Since the depth of the first connecting hole 301 is greater than the height of the first boss 32, that is, in the axial direction of the first valve core assembly 30, the distance from the first valve port 302 to the welding surface between the first valve core assembly 30 and the connecting piece 20 is increased. Therefore, the heat effect of laser welding on the first valve port 302 can be further reduced, thereby effectively ensuring the accuracy of the first valve port 302, and further greatly improving the flow accuracy of the refrigerant.

[0041] To further improve the matching accuracy between the first valve core assembly 30 and the connecting piece 20, in one embodiment, the outer wall of the first boss 32 and the inner wall of the first assembly hole 21 are interference-fitted. In this way, the first valve core assembly 30 can be prevented from being offset relative to the connecting piece 20, thereby effectively ensuring the coaxiality during installation.

[0042] The interference between the first boss 32 and the first assembly hole 21 is in the range of 0 to 0.04 mm, which not only improves the matching strength between the two but also avoids causing a significant impact on the assembly difficulty.

[0043] It should be noted that the interference between the first boss 32 and the first assembly hole 21 refers to the difference between the outer diameter of the first boss 32 and the inner diameter of the first assembly hole 21 .

[0044] In one embodiment, if Figure 3 As shown, the first valve seat 31 is provided with a first receiving hole 303 and a first opening 304. One end of the first receiving hole 303 is connected to the first communicating hole 301 through the first valve port 302, and the other end is connected to the first valve cavity 11 through the first opening 304. The first valve core assembly 30 also includes a first valve core 33, which is movably disposed in the first receiving hole 303 and is used to open / close the first valve port 302.

[0045] It can be understood that in this embodiment, the first valve core assembly 30 is a full-flow structure. Specifically, when the pressure of the refrigerant is greater than the gravity of the first valve core 33, the refrigerant in the first connecting hole 301 will push the first valve core 33 to move, thereby opening the first valve port 302, so that the refrigerant flows from the first valve port 302 through the first receiving hole 303 and the first opening 304 in sequence into the first valve cavity 11, wherein the first valve core 33 can move to completely separate from the first valve port 302, thereby achieving full circulation of the refrigerant, thus meeting the large flow requirements of the air-conditioning system under specific working conditions (such as defrosting working conditions, etc.), and effectively improving the working performance of the air-conditioning system. When the pressure of the refrigerant is less than the gravity of the first valve core 33, the first valve core 33 will move toward the position of the first valve port 302 and close the first valve port 302.

[0046] Specifically, the connecting piece 20 is provided with a first channel 23 connecting the first connecting hole 301 and the second valve chamber 12, and the first channel 23 is configured as a straight channel axially inclined relative to the connecting piece 20. In this way, the flow resistance of the refrigerant when flowing in the first channel 23 is small, which is beneficial to improving the stability of the two-way throttle valve 100.

[0047] When the first valve port 302 is opened, the refrigerant pressure will be greater than the gravity of the first valve core 33, and the first valve core 33 will always move in the first accommodating hole 303 toward a position away from the first valve port 302. In this way, there is a risk that the first valve core 33 will escape from the first opening 304. In order to prevent the first valve core 33 from escaping from the first valve seat 31 from the first opening 304, in one embodiment, the first valve core assembly 30 also includes a limiting structure 34, which is arranged at the first opening 304 and connected to the first valve seat 31. When the first valve core 33 moves to the first opening 304, the limiting structure 34 can stop the first valve core 33 to prevent the first valve core 33 from moving in a direction away from the first valve port 302. In this way, the stopping effect of the limiting structure 34 can limit the movement of the first valve core 33, thereby ensuring the safety of the first valve core 33.

[0048] In one embodiment, if Figure 5 As shown, the limiting structure 34 is configured as a limiting pin (not shown), the first valve seat 31 is provided with a limiting hole 306, the limiting pin is inserted into the limiting hole 306 and connected to the first valve seat 31, and at least part of the limiting pin is disposed in the first accommodating hole 303. In this way, the matching of the limiting pin and the limiting hole 306 is simple, which can improve the overall assembly efficiency and achieve a better stopping effect on the first valve core 33. In addition, there is a gap between the limiting pin and the side wall at the first opening 304 to meet the flow requirements of the refrigerant.

[0049] In another embodiment, if Figure 6As shown, one end of the limiting structure 34 is connected to the first valve seat 31, and the other end is set to be contracted in the direction close to the center line of the first valve seat 31. In this way, it can also have a good stopping effect on the first valve core 33, and the limiting structure 34 can also form a gap for the refrigerant to flow when it contracts.

[0050] Specifically, the limiting structure 34 and the first valve seat 31 are integrally formed structures, that is, the end of the first valve seat 31 is bent toward its own axis to form a conical limiting structure 34. Of course, in other embodiments, the limiting structure 34 and the first valve seat 31 can also be separate structures and connected by riveting or other methods.

[0051] Generally, the refrigerant flows in the first receiving hole 303 through the gap between the first valve core 33 and the inner wall of the first receiving hole 303, so the size of the gap will greatly affect the flow area of ​​the refrigerant. Figure 7 As shown, the outer wall of the first valve core 33 is provided with a flow surface 331, and the flow surface 331 is spaced apart from the inner wall of the first receiving hole 303. In this way, by machining the flow surface 331 on the outer surface of the first valve core 33, the size of the gap formed between the first valve core 33 and the inner wall of the first receiving hole 303 can be increased, thereby increasing the flow area of ​​the refrigerant and effectively improving the refrigerant flow capacity.

[0052] Specifically, the number of the flow surfaces 331 is set to be multiple, and the multiple flow surfaces 331 are arranged at intervals along the circumference of the first valve core 33. In order to improve the stability of the first valve core 33 when moving, arc surfaces are arranged between adjacent flow surfaces 331, and along the axial direction of the first valve core assembly 30, the first valve core 33 is movably connected with the inner wall of the first accommodating hole 303 through the arc surface.

[0053] In another embodiment, if Figure 1 , Figure 3 and Figure 5 As shown, the outer wall of the first valve seat 31 and the inner wall of the first valve cavity 11 are spaced apart and clamped to form a first gap flow channel 111. A flow hole 305 is opened on the side wall of the first valve seat 31, and both ends of the flow hole 305 are respectively connected to the first accommodating hole 303 and the first gap flow channel 111.

[0054] In this embodiment, by opening a hole on the first valve seat 31, the circulation area of ​​the refrigerant is greatly increased, which is conducive to the flow of the refrigerant, thereby meeting the full circulation requirement of the refrigerant. In addition, it is also possible to avoid processing the first valve core 33, thereby reducing the difficulty of processing the first valve core 33. Preferably, the circulation hole 305 is opened on the side wall of the first valve seat 31 near the first valve port 302 to better meet the circulation of the refrigerant.

[0055] Furthermore, in this embodiment, if Figure 8 As shown, the side surface where the first valve core 33 and the inner wall of the first accommodating hole 303 cooperate can be set to be circular, and the gap between the first valve core 33 and the inner wall of the first accommodating hole 303 can also be eliminated to further improve the movement stability of the first valve core 33.

[0056] The installation of the second valve core assembly 40 and the connecting member 20 is similar to that of the first valve core assembly 30. Specifically, in one embodiment, as shown in FIG. Figure 2 , Figure 4 and Fig. 9 As shown, the connecting piece 20 is also provided with a second assembly hole 22, and the second valve core assembly 40 includes a second valve seat 41 and a second boss 42. Along the axial direction of the second valve core assembly 40, the second boss 42 protrudes and is connected to one end of the second valve seat 41, and the second boss 42 is inserted into the second assembly hole 22 and connected to the second assembly hole 22, wherein the height of the second boss 42 is less than the depth of the second assembly hole 22.

[0057] It can be understood that the provision of the second boss 42 facilitates the positioning of the second valve core assembly 40 and the connecting piece 20, thereby facilitating the subsequent welding operation and improving the welding efficiency and welding strength of the second valve core assembly 40 and the connecting piece 20. In addition, when the second boss 42 is inserted into the second assembly hole 22, since the height of the second boss 42 is less than the depth of the second assembly hole 22, the end surface of the second valve seat 41 can abut against the end surface of the connecting piece 20, that is, there is no gap between the two welding surfaces of the second valve core assembly 40 and the connecting piece 20 for laser welding, so that the welding effect of the laser welding between the second valve core assembly 40 and the connecting piece 20 can be guaranteed.

[0058] Specifically, in this embodiment, the second valve seat 41 and the second boss 42 are an integrally formed structure to reduce assembly steps and improve the overall structural strength.

[0059] Further, in one embodiment, if Fig. 9 As shown, the second boss 42 is provided with a second connecting hole 401 connected to the second valve port 402. Along the axial direction of the second valve core assembly 40, the depth h3 of the second connecting hole 401 and the height h4 of the second boss 42 satisfy h3>h4. Since the depth of the second connecting hole 401 is greater than the height of the second boss 42, that is, in the axial direction of the second valve core assembly 40, the distance from the second valve port 402 to the welding surface between the second valve core assembly 40 and the connecting piece 20 is increased. Therefore, the heat effect of laser welding on the second valve port 402 can be further reduced, thereby effectively ensuring the accuracy of the second valve port 402, and further greatly improving the flow accuracy of the refrigerant.

[0060] To further improve the matching accuracy between the second valve core assembly 40 and the connecting piece 20, in one embodiment, the outer wall of the second boss 42 and the inner wall of the second assembly hole 22 are interference-fitted. In this way, the second valve core assembly 40 can be prevented from being offset relative to the connecting piece 20, thereby effectively ensuring the coaxiality during installation.

[0061] The interference between the second boss 42 and the second assembly hole 22 is in the range of 0 to 0.04 mm, which not only improves the matching strength between the two but also avoids causing a significant impact on the assembly difficulty.

[0062] In one embodiment, if Figure 3 As shown, the second valve seat 41 is provided with a second accommodating hole 403 and a second opening 404. One end of the second accommodating hole 403 is connected to the second communicating hole 401 through the second valve port 402, and the other end is connected to the second valve cavity 12 through the second opening 404. The second valve core assembly 40 also includes a second valve core 43, an elastic member 44 and a sealing head 45. The sealing head 45 is arranged at the second opening 404 and connected to the second valve seat 41. The second valve core 43 and the elastic member 44 are arranged in the second accommodating hole 403, and one end of the second valve core 43 is connected to the sealing head 45 through the elastic member 44, and the other end is movably matched with the second valve port 402 to adjust the flow rate at the second valve port 402.

[0063] It can be understood that, in this embodiment, the second valve core assembly 40 controls the movement of the second valve core 43 by the flow pressure of the refrigerant and the elastic force of the elastic member 44, so as to realize the throttling control of the second valve core 43 on the second valve port 402. Specifically, when the pressure of the refrigerant is greater than the elastic force of the elastic member 44, the refrigerant in the second connecting hole 401 will push the second valve core 43 to move, thereby opening the second valve port 402, so that the refrigerant flows from the second valve port 402 through the second receiving hole 403 and the second opening 404 in sequence into the second valve cavity 12. Among them, the pressure of the refrigerant and the elastic force of the elastic member 44 can be reasonably set according to the actual flow requirements, so as to realize different movement distances of the second valve core 43 and meet different throttling effects. When the pressure of the refrigerant is less than the elastic force of the elastic member 44, under the recovery action of the elastic member 44, the second valve core 43 will move in the opposite direction toward the position of the second valve port 402, reduce the flow area at the second valve port 402, and even close the second valve port 402.

[0064] Specifically, the connecting piece 20 is also provided with a second channel 24 connecting the second connecting hole 401 and the first valve chamber 11, and the second channel 24 is configured as a straight channel axially inclined relative to the connecting piece 20. In this way, the flow resistance of the refrigerant when flowing in the second channel 24 is small, which is beneficial to improving the stability of the two-way throttle valve 100.

[0065] It should be noted that the seal head 45 is also provided with a gap or opening for refrigerant to flow at the second opening 404 to ensure smooth flow of the refrigerant. In addition, the second valve seat 41 is provided with a structure similar to the conical limiting structure 34 at the second opening 404 to achieve fixation and limiting of the seal head 45.

[0066] When assembling the two-way throttle valve 100 provided in the present application, the first boss 32 can be first pressed into the first assembly hole 21 of the connecting piece 20, and the second boss 42 can be pressed into the second assembly hole 22 to achieve interference pre-fit. Afterwards, the first valve core assembly 30, the second valve core assembly 40 and the connecting piece 20 are fixed by laser welding, which on the one hand improves the connection strength, and on the other hand reduces the thermal impact of ordinary welding on the first valve port 302 and the second valve port 402, thereby improving the flow accuracy of the refrigerant. Further, the first valve core 33 is placed in the first receiving hole 303 through the first opening 304, and the limit pin is inserted into the limit hole 306 to limit the first valve core 33, and the assembly of the first valve core assembly 30 is completed. Similarly, the second valve core 43, the elastic member 44 and the head 45 are placed in the second receiving hole 403 in turn, and the head 45 is limited to complete the assembly of the second valve core assembly 40. Finally, the integral structure consisting of the first valve core assembly 30 , the second valve core assembly 40 and the connecting piece 20 is placed in the valve tube 10 , and the integral structure is fixed by the cooperation between the necking of the valve tube 10 and the groove structure on the surface of the connecting piece 20 .

[0067] Furthermore, the bidirectional throttle valve 100 provided in the present application is a bidirectional flow and unidirectional throttling structure. Specifically, a first gap flow channel 111 is formed between the outer surface of the first valve seat 31 and the inner wall of the first valve cavity 11 on the valve tube 10, and a second gap flow channel 121 is formed between the outer surface of the second valve seat 41 and the inner wall of the second valve cavity 12 on the valve tube 10.

[0068] When the first valve core assembly 30 is working, the two-way throttle valve 100 is in a full flow state, and the refrigerant first enters the second valve cavity 12 of the valve tube 10. Since the second valve core 43 is affected by the refrigerant flow pressure and the elastic force of the elastic member 44, it will block the second valve port 402, and the refrigerant cannot flow through the second valve port 402. Therefore, the refrigerant will flow to the second channel 24 on the connecting member 20 through the second gap flow channel 121, and flow into the first connecting hole 301 to push the first valve core 33, so that the first valve core 33 moves and opens the first valve port 302, and then flows into the first valve cavity 11 through the first accommodating hole 303 and the first opening 304 in sequence, or flows into the first gap flow channel 111 (first valve cavity 11) through the through hole on the side wall of the first valve seat 31 in the first accommodating hole 303. During this period, the first valve core 33 basically does not restrict the flow at the first valve port 302, thereby achieving full circulation of the refrigerant.

[0069] When the second valve core assembly 40 is working, the two-way throttle valve 100 is in a throttling state, and the refrigerant first enters the first valve cavity 11 of the valve tube 10. Since the first valve core 33 is affected by the refrigerant flow pressure and its own gravity, it will block the first valve port 302, and the refrigerant cannot flow through the first valve port 302. Therefore, the refrigerant will flow to the first channel 23 on the connecting member 20 through the first gap flow channel 111, and flow into the second connecting hole 401 to push the second valve core 43, so that the second valve core 43 moves and opens the second valve port 402, and then flows into the second valve cavity 12 through the second accommodating hole 403 and the second opening 404 in sequence. During this period, the flow rate of the refrigerant is controlled by the pressure difference and the elastic force of the elastic member 44 to achieve throttling.

[0070] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A two-way throttle valve, characterized in that: The invention comprises a valve tube (10), a connecting piece (20), a first valve core assembly (30) and a second valve core assembly (40), wherein the connecting piece (20) is installed in the valve tube (10) and divides the interior of the valve tube (10) into a first valve cavity (11) and a second valve cavity (12), the first valve core assembly (30) is arranged in the first valve cavity (11), the second valve core assembly (40) is arranged in the second valve cavity (12), and the first valve core assembly (30) and the second valve core assembly (40) are respectively laser welded to the connecting piece (20); Wherein, the first valve core assembly (30) is provided with a first valve port (302) toward one end of the connecting piece (20), and the second valve core assembly (40) is provided with a second valve port (402) toward one end of the connecting piece (20); the first valve core assembly (30) is connected to the second valve cavity (12) through the first valve port (302) and the connecting piece (20), and the second valve core assembly (40) is connected to the first valve cavity (11) through the second valve port (402) and the connecting piece (20).

2. The two-way throttle valve according to claim 1, characterized in that: The connecting piece (20) is provided with a first assembly hole (21), the first valve core assembly (30) comprises a first valve seat (31) and a first boss (32), along the axial direction of the first valve core assembly (30), the first boss (32) protrudes and is connected to one end of the first valve seat (31), and the first boss (32) is inserted into the first assembly hole (21) and connected to the first assembly hole (21); Wherein, the height of the first boss (32) is smaller than the depth of the first assembly hole (21).

3. The two-way throttle valve according to claim 2, characterized in that: The first boss (32) is provided with a first communicating hole (301), the first valve seat (31) is provided with a first accommodating hole (303) and a first opening (304), one end of the first accommodating hole (303) is connected to the first communicating hole (301) through the first valve port (302), and the other end is connected to the first valve cavity (11) through the first opening (304); The first valve core assembly (30) further comprises a first valve core (33), wherein the first valve core (33) is movably disposed in the first accommodating hole (303) and is used for opening / closing the first valve port (302).

4. The two-way throttle valve according to claim 3, characterized in that: Along the axial direction of the first valve core assembly (30), the depth h1 of the first communicating hole (301) and the height h2 of the first boss (32) satisfy h1>h2.

5. The two-way throttle valve according to claim 3, characterized in that: The outer wall of the first valve seat (31) and the inner wall of the first valve cavity (11) are spaced apart and sandwiched to form a first gap flow channel (111); a flow hole (305) is opened on the side wall of the first valve seat (31); two ends of the flow hole (305) are respectively connected to the first accommodating hole (303) and the first gap flow channel (111); And / or, the outer side wall of the first valve core (33) is provided with a flow surface (331), and the flow surface (331) and the inner side wall of the first accommodating hole (303) are arranged in a spaced relationship.

6. The two-way throttle valve according to claim 3, characterized in that: The first valve core assembly (30) further comprises a limiting structure (34), wherein the limiting structure (34) is arranged at the first opening (304) and connected to the first valve seat (31); When the first valve core (33) moves to the first opening (304), the limiting structure (34) can stop the first valve core (33) to prevent the first valve core (33) from moving in a direction away from the first valve port (302).

7. The two-way throttle valve according to claim 6, characterized in that: One end of the limiting structure (34) is connected to the first valve seat (31), and the other end is arranged to be contracted in a direction close to the center line of the first valve seat (31); Alternatively, the limiting structure (34) is configured as a limiting pin, the first valve seat (31) is provided with a limiting hole (306), the limiting pin is inserted into the limiting hole (306) and connected to the first valve seat (31), and at least a portion of the limiting pin is disposed in the first accommodating hole (303).

8. The two-way throttle valve according to claim 2, characterized in that: The outer side wall of the first boss (32) and the inner side wall of the first assembly hole (21) are interference fit.

9. The two-way throttle valve according to claim 1 or 2, characterized in that: The connecting piece (20) is further provided with a second assembly hole (22); the second valve core assembly (40) comprises a second valve seat (41) and a second boss (42); along the axial direction of the second valve core assembly (40), the second boss (42) protrudes and is connected to one end of the second valve seat (41); the second boss (42) is inserted into the second assembly hole (22) and is connected to the second assembly hole (22); and the height of the second boss (42) is less than the depth of the second assembly hole (22); The second boss (42) is provided with a second connecting hole (401) connected with the second valve port (402), and along the axial direction of the second valve core assembly (40), the depth h3 of the second connecting hole (401) and the height h4 of the second boss (42) satisfy h3>h4.

10. The two-way throttle valve according to claim 9, characterized in that: The second valve seat (41) is provided with a second accommodating hole (403) and a second opening (404); one end of the second accommodating hole (403) is connected to the second communicating hole (401) through the second valve port (402), and the other end is connected to the second valve cavity (12) through the second opening (404); The second valve core assembly (40) also includes a second valve core (43), an elastic member (44) and a sealing head (45); the sealing head (45) is arranged at the second opening (404) and connected to the second valve seat (41); the second valve core (43) and the elastic member (44) are arranged in the second accommodating hole (403); one end of the second valve core (43) is connected to the sealing head (45) through the elastic member (44), and the other end is movably matched with the second valve port (402) for adjusting the flow rate at the second valve port (402).

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