Valve device

Abstract

The invention discloses a valve device which comprises a valve seat, an outlet connecting pipe, a first seat component and a second seat component. The upper end, fixedly inserted into the valve seat, of the outlet connecting pipe is provided with a flanging part; the first seat component is fixedly arranged in an inner cavity of the valve seat, and the second seat component is fixedly arranged in the outlet connecting pipe. The first seat component is provided with a valve port part, an expanded cavity is formed between the first seat component and the flanging part, and the hole diameter of an inner hole of the flanging part is smaller than the inner diameter of the expanded cavity; at least one step channel section is formed between the second seat component and the outlet connecting pipe, the large-diameter channel section of the step channel section is located above the small-diameter channel section, and at least part of the flanging bottom wall face of the flanging part forms part of the channel wall of the large-diameter channel section. The axial height M of the valve port part is less than or equal to 1mm; the inner diameter of the valve port part is D1, the axial height of the expanded cavity is H1, the inner diameter of the expanded cavity is D2, H1 is smaller than or equal to (1 / 3) D2, and D2 is larger than D1; the axial height of the large-diameter channel section is H2, the inner diameter of the large-diameter channel section is D3, and H2 is smaller than or equal to (1 / 3) D3. The valve device is low in refrigerant noise.

Description

Technical Field

[0001] The present application relates to the field of refrigeration control technology, and in particular to a valve device. Background Art

[0002] Valve devices, such as electronic expansion valves, as throttling elements, have the advantages of high regulation accuracy and precise temperature control, and are widely used in the fields of air conditioning, refrigeration and freezing.

[0003] When the valve device is working, when the refrigerant flows through the valve port channel of the valve device, the flow area changes dramatically, causing the pressure and flow rate of the refrigerant to change dramatically, which is likely to cause refrigerant noise, thereby affecting the comfort experience of people in the application environment.

[0004] Therefore, how to reduce the refrigerant noise generated when the valve device is working has become one of the key topics of concern in the industry. Summary of the invention

[0005] The purpose of the present application is to provide a valve device which can reduce the noise caused by the flow of refrigerant through structural optimization and improve the noise comfort of the valve device in the system.

[0006] In order to solve the above technical problems, the present application provides a valve device, including a valve seat, a first seat component, a second seat component and an outlet pipe;

[0007] The upper end of the outlet pipe is fixedly inserted into the valve seat, and the upper end of the outlet pipe is folded inward to form an annular flange portion;

[0008] The first seat member and the second seat member are respectively arranged on both sides of the flange portion, the first seat member is fixedly arranged in the inner cavity of the valve seat, and the second seat member is fixedly arranged in the tube cavity of the outlet pipe;

[0009] The first seat member has a valve opening, an expansion cavity is formed between the first seat member and the flange, the expansion cavity communicates with the valve opening and the inner hole of the flange, and the diameter of the inner hole is smaller than the inner diameter of the expansion cavity;

[0010] At least one stepped channel section is formed between the second seat member and the outlet pipe, and the stepped channel section is connected to the inner hole; the stepped channel section includes a large-diameter channel section and a small-diameter channel section that are connected to each other, the large-diameter channel section is located above the small-diameter channel section, and at least part of the flange bottom wall surface of the flange portion constitutes a part of the channel wall of the large-diameter channel section;

[0011] The axial height of the valve mouth is M, M≤1mm;

[0012] The inner diameter of the valve mouth is D1, the axial height of the expansion cavity is H1, the inner diameter of the expansion cavity is D2, H1≤(1 / 3)D2, D2>D1;

[0013] The axial height of the large-diameter channel section is H2, the inner diameter of the large-diameter channel section is D3, and H2≤(1 / 3)D3.

[0014] In one feasible solution, the first seat member includes an annular seat base and a first extending wall portion extending radially inward from the seat base;

[0015] The inner peripheral wall of the first extending wall portion encloses the valve opening portion, and the thickness of the first extending wall portion is the axial height of the valve opening portion;

[0016] The seat base is in contact with the flange portion, and the cavity wall of the expansion cavity includes an inner peripheral wall of the seat base, a lower wall surface of the first extending wall portion, and a partial flange top wall surface of the flange portion.

[0017] In one feasible solution, the valve seat includes a convex ring portion extending radially inward from the circumferential cavity wall of the inner cavity, and the inner cavity includes an upper chamber located above the convex ring portion and a lower chamber located below the convex ring portion;

[0018] The outlet pipe is tightly matched with the lower chamber, and the flange top wall surface of the flange portion abuts against the convex ring bottom wall surface of the convex ring portion;

[0019] The first seat member includes a second extension wall portion extending radially outward from the seat base; the lower wall surface of the second extension wall portion abuts against the convex ring top wall surface of the convex ring portion, and the outer peripheral wall of the second extension wall portion is tightly matched with the upper cavity peripheral wall of the upper cavity;

[0020] The outer peripheral wall of the seat base is tightly matched with the inner peripheral wall of the convex ring part, and the lower wall surface of the seat base is in contact with the flange top wall surface of the flange part.

[0021] In a feasible solution, more than two stepped channel sections are formed between the second seat component and the outlet pipe.

[0022] In an achievable solution, the second seat member includes more than two seat portions, the more than two seat portions are arranged along the axial direction, a large-diameter channel section is formed between the seat portion closest to the flange portion and the flange portion, and a large-diameter channel section is formed between two adjacent seat portions;

[0023] Each of the seat portions has the small-diameter channel section.

[0024] In a feasible solution, each of the seat portions is separately arranged, two adjacent seat portions abut against each other in the axial direction, and the seat portion closest to the flange portion abuts against the flange portion;

[0025] The upper end of the seat portion has a groove portion, and the seat portion also has a through hole communicated with the groove portion, and the through hole is the small-diameter channel section.

[0026] In a feasible solution, the axial height of each of the small-diameter channel sections is greater than the axial height of the expansion cavity;

[0027] In the same stepped channel section, the axial height of the small-diameter channel section is greater than the axial height of the large-diameter channel section.

[0028] In a feasible solution, the ratio of the inner diameter of the expansion cavity to the aperture of the inner hole is not less than 3 / 2, and the ratio of the inner diameter of the large-diameter channel section to the inner diameter of the small-diameter channel section is not less than 3 / 2.

[0029] In a feasible solution, at least a part of the structure of the second seat component is made of filter material.

[0030] In a feasible solution, the axial center lines of the valve mouth, the inner hole and the small-diameter channel section coincide with each other, and the aperture of the inner hole and the inner diameter of the small-diameter channel section are not less than the inner diameter of the valve mouth.

[0031] The valve device provided in the embodiment of the present application sets the axial height of the valve mouth portion to be no more than 1 mm, which can effectively inhibit the initiation and development of bubbles and has a positive effect on reducing bubble noise; the expansion cavity connected to the valve mouth portion and located below the valve mouth portion and the large-diameter channel section in the step channel section located below the flange portion are both set to a flat structure, so that when the refrigerant flows into the expansion cavity or the large-diameter channel section, the pressure can rise rapidly, and accompanied by the appearance of slight vortices, the refrigerant pressure can be raised again, thereby effectively inhibiting the development and growth process of possible bubbles, causing the bubbles to begin to collapse when they are smaller in size and number, thereby reducing the noise caused by bubbles and improving the comfort of human ears in the application environment of the valve device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A cross-sectional schematic diagram of a valve device in an embodiment provided in the present application;

[0033] Figure 2 for Figure 1 A partial enlarged view of the middle A area;

[0034] Figure 3 for Figure 1 A partial cross-sectional diagram of the middle valve seat;

[0035] Figure 4 for Figure 2 A schematic cross-sectional view of the first seat component;

[0036] Figure 5 for Figure 2 A partial cross-sectional diagram of the middle outlet pipe;

[0037] Figure 6 for Figure 2 Schematic cross-sectional view of the second seat component.

[0038] Description of reference numerals:

[0039] Valve body component 10, valve seat 11, convex ring portion 111, convex ring bottom wall surface 1111, convex ring top wall surface 1112, upper chamber 112, upper chamber peripheral wall 1121, lower chamber 113, guide seat 12, first seat member 13, valve mouth portion 131, seat base 132, first extension wall portion 133, second extension wall portion 134;

[0040] Outlet pipe 21, flange portion 211, inner hole 2111, flange bottom wall surface 2112, flange top wall surface 2113, second seat member 22, seat portion 221, groove portion 2211, through hole 2212;

[0041] Import takeover 30;

[0042] Valve needle component 40, valve needle 41, sleeve portion 42, elastic member 43, support component 44, fixing member 45, sleeve cover 46;

[0043] Screw 50;

[0044] Nut 60, connecting piece 61;

[0045] Rotor component 70, magnetic rotor 71, connecting plate 72;

[0046] Cover 81, valve housing 82;

[0047] Expansion cavity 1P, step channel section 2P, large diameter channel section 21P, small diameter channel section 22P. DETAILED DESCRIPTION

[0048] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0049] The terms "first", "second", and "third" as used herein are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features.

[0050] The directional words "upper", "lower" etc. involved in this article are defined based on the positions of components in the accompanying drawings or the relative positions of components. "Axial" refers to the axial direction of the valve seat component of the valve device or the axial direction of the screw rod. In the drawings, the axial direction is the up and down direction, and the "radial" refers to the direction perpendicular to the "axial direction". The use of directional words is only for the convenience of understanding and description and does not constitute a limitation on the scope of protection.

[0051] Please refer to Figure 1 , Figure 1 A cross-sectional schematic diagram of a valve device in an embodiment provided in the present application.

[0052] In this embodiment, the valve device can be an electronic expansion valve or an electric valve, etc., and the valve device can be applied to a refrigeration system. The valve device includes a valve body component 10, an inlet pipe 30, an outlet pipe 21, a valve needle component 40, a screw rod 50, a nut 60, a rotor component 70 and a valve housing 82.

[0053] The valve body member 10 has a valve port portion 131 (indicated at Figure 2 In the figure, the valve body component 10 is fixedly connected with an inlet pipe 30 and an outlet pipe 21, and the inlet pipe 30 and the outlet pipe 21 are connected through the valve port 131. The inlet pipe 30 and the outlet pipe 21 can be fixedly connected to the valve body component 10 by interference fit, welding, or a combination of interference fit and welding.

[0054] In use, the refrigerant flows into the valve body component 10 from the inlet pipe 30, passes through the valve port 131, and flows out from the outlet pipe 21. The inlet pipe 30 is connected to the circumference of the valve body component 10, and the outlet pipe 21 is connected to the bottom of the valve body component 10.

[0055] The valve housing 82 is fixedly connected to the upper end of the valve body component 10. The valve housing 82 and the valve body component 10 can form a space for installing other structures of the valve device (such as the aforementioned valve needle component 40, screw rod 50, nut 60 and rotor component 70, etc.). In some embodiments, the valve housing 82 can be directly fixedly connected to the upper end of the valve body component 10; in other embodiments, the valve housing 82 can be fixedly connected to the valve body component 10 through a transition structure, such as Figure 1 As shown, the valve device further includes a cover 81 , which is fixedly connected to the upper end of the valve body component 10 , and a valve housing 82 is further fixedly connected to the cover 81 .

[0056] The rotor component 70 is located in the valve housing 82 . The rotor component 70 includes a magnetic rotor 71 and a connecting plate 72 . The connecting plate 72 is fixedly connected to the magnetic rotor 71 . The magnetic rotor 71 can rotate by inducing the electromagnetic force of an electromagnetic coil (not shown in the figure).

[0057] The screw rod 50 is fixedly connected to the rotor component 70 , and specifically, the screw rod 50 can be fixedly connected to the connecting plate 72 , so that the screw rod 50 can rotate along with the rotation of the rotor component 70 .

[0058] The screw rod 50 is inserted into the nut 60 and threadedly connected with the nut 60, and the lower end of the screw rod 50 is connected with the valve needle component 40. The nut 60 is limited in the circumferential direction, so that when the screw rod 50 rotates, the valve needle component 40 can be driven to approach or move away from the valve port 131 along the axial direction under the action of the threaded connection with the nut 60 to close or open the valve port 131.

[0059] Figure 1 In the example shown, the nut 60 may be fixedly connected to the cover 81 via the connecting piece 61 , so that the nut 60 and the valve body component 10 are relatively fixed and cannot rotate circumferentially.

[0060] The valve needle component 40 includes a valve needle 41 , a sleeve portion 42 , an elastic member 43 , a supporting member 44 , a fixing member 45 and a sleeve cover 46 .

[0061] The valve needle 41 and the screw rod 50 can be connected in a floating manner through the cooperation of the sleeve portion 42, the elastic member 43, the support member 44, the fixing member 45 and the sleeve cover 46. For example, the valve needle 41 passes through the sleeve portion 42 and is suspended at the lower end of the sleeve portion 42; the sleeve cover 46 is fixed to the upper end of the sleeve portion 42; the lower end of the screw rod 50 passes through the sleeve cover 46 and is connected to the fixing member 45, and the fixing member 45 can abut against the sleeve cover 46; the support member 44 is installed at the bottom end of the sleeve portion 42 and can cooperate with the upper end of the valve needle 41, and the elastic member 43 is arranged between the support member 44 and the fixing member 45.

[0062] When the screw rod 50 drives the valve needle component 40 to move downward to close the valve mouth portion 131, the sealing portion at the lower end of the valve needle 41 can be sealed and abutted against the valve mouth portion 131. At this time, if the rotor component 70 continues to rotate and the screw rod 50 continues to move downward, the valve needle 41 will not move axially due to the abutment of the valve mouth portion 131. The screw rod 50 will move downward relative to the valve needle 41, and squeeze the elastic component 43 through the fixing component 45, so that the elastic component 43 applies elastic force to the valve needle 41 to ensure the reliability of valve closing.

[0063] When opening the valve, the screw rod 50 first moves up until the fixing member 45 abuts against the sleeve cover 46 , and then drives the valve needle 41 to move up to open the valve opening 131 , thereby improving the valve opening performance.

[0064] In some embodiments, the valve body component 10 may include a valve seat 11 and a guide seat 12, wherein the guide seat 12 is fixed to the inner cavity of the valve seat 11, and the guide seat 12 may guide the valve needle 41 to ensure the accuracy of the axial movement of the valve needle 41. The guide seat 12 may also guide the sleeve portion 42 to ensure the accuracy of the axial movement of the sleeve portion 42. The inlet pipe 30 and the outlet pipe 21 are both fixedly connected to the valve seat 11.

[0065] Figure 1 The specific structure of a valve device is only given as an example. In other embodiments, the specific structures of the valve needle component 40, the screw rod 50, the nut 60 and the rotor component 70, or the way they cooperate with each other can be changed as needed, or existing designs can be adopted.

[0066] In application scenarios such as home environments, in order to reduce the loud noise generated when the refrigerant passes through the valve mouth 131 (throttling part) that affects the comfort of the human ear, this application focuses on improving the structure of the valve device in the area where the valve mouth 131 is located.

[0067] Please refer to Figures 2 to 6 , Figure 2 for Figure 1 A partial enlarged view of the A part. Figure 3 for Figure 1 Partial cross-sectional diagram of the middle valve seat. Figure 4 for Figure 2 A schematic cross-sectional view of the first seat component in FIG. Figure 5 for Figure 2 Schematic diagram of the partial section of the outlet pipe. Figure 6 for Figure 2 In order to clearly illustrate the structure of the area where the valve port portion 131 is located, Figure 2 The valve needle 41 is hidden.

[0068] In this embodiment, the valve body component 10 of the valve device further includes a first seat component 13 . The first seat component 13 is fixed to the inner cavity of the valve seat 11 . The first seat component 13 is provided with the aforementioned valve opening portion 131 .

[0069] The upper end of the outlet pipe 21 is fixedly inserted into the valve seat 11 , and the upper end of the outlet pipe 21 inserted into the valve seat 11 is folded inward to form an annular flange portion 211 .

[0070] The valve device further comprises a second seat component 22 , which is fixed in the tube cavity of the outlet pipe 21 .

[0071] The first seat component 13 and the second seat component 22 are respectively disposed on both sides of the flange portion 211 , that is, the first seat component 13 is located above the flange portion 211 , and the second seat component 22 is located below the flange portion 211 .

[0072] An expansion cavity 1P is formed between the first seat member 13 and the flange portion 211 . The expansion cavity 1P communicates with the valve port portion 131 and the inner hole 2111 of the flange portion 211 . The diameter of the inner hole 2111 is smaller than the inner diameter D2 of the expansion cavity 1P.

[0073] At least one stepped channel section 2P is formed between the second seat member 22 and the outlet pipe 21. The stepped channel section 2P is connected to the inner hole 2111. The stepped channel section 2P includes a large-diameter channel section 21P and a small-diameter channel section 22P that are connected to each other. The large-diameter channel section 21P is located above the small-diameter channel section 22P. At least part of the flanged bottom wall surface 2112 of the flanged portion 211 constitutes a partial channel wall of the large-diameter channel section 21P. In this way, the inner diameter of the large-diameter channel section 21P is greater than the aperture of the inner hole 2111.

[0074] Since the second seat component 22 is located in the tube cavity of the outlet pipe 21 , it can be understood that the step channel section 2P is also connected to the tube cavity of the outlet pipe 21 .

[0075] After the above arrangement, after the refrigerant flows into the valve seat 11 from the inlet pipe 30 , it can flow through the valve mouth portion 131 , the expansion cavity 1P, the inner hole 2111 of the flange portion 211 and each step channel section 2P in sequence, and then flow out from the outlet pipe 21 .

[0076] In this embodiment, the axial height of the valve mouth portion 131 is M, M≤1mm. The inner diameter of the valve mouth portion 131 is D1, the axial height of the expansion cavity 1P is H1, the inner diameter of the expansion cavity 1P is D2, H1≤(1 / 3)D2, D2>D1. The axial height of the large diameter channel section 21P is H2, the inner diameter of the large diameter channel section 21P is D3, H2≤(1 / 3)D3.

[0077] After research and analysis, it is known that bubbles are easily generated when the refrigerant flows through the valve mouth 131, and the bubbles are easily generated close to the inner wall surface of the valve mouth 131, and grow and develop in the axial channel formed by the valve mouth 131. In this embodiment, the axial height M of the valve mouth 131 is set to be no more than 1 mm, which can effectively inhibit the generation and development of bubbles and has a positive effect on reducing bubble noise.

[0078] At the same time, the inner diameter and axial height of the expansion chamber 1P which is connected to the valve mouth portion 131 and located below the valve mouth portion 131 are set according to the above-mentioned proportions, so that the expansion chamber 1P has a flat structure. In this way, when the refrigerant flows into the expansion chamber 1P from the valve mouth portion 131, it flows from the small-diameter cavity section with a relatively small inner diameter into the large-diameter cavity section with a relatively large inner diameter. Due to the sudden increase in the flow area and the flat structure of the expansion chamber 1P, the pressure of the refrigerant in the expansion chamber 1P can recover quickly, and accompanied by the appearance of slight vortices, the refrigerant pressure can be raised again, thereby effectively suppressing the development and growth process of possible bubbles, causing the bubbles to begin to collapse when they are smaller in size and number, thereby reducing the noise caused by bubbles.

[0079] The large-diameter channel section 21P of the step channel section 2P below the inner hole 2111 is also set to a flat structure. In this way, when the refrigerant flows out of the expansion cavity 1P, is rectified by the inner hole 2111, and then flows into each step channel section 2P in turn, expansion pressure occurs in each large-diameter channel section 21P to inhibit the development and growth of bubbles, reduce the size and number of bubbles, and effectively reduce the noise generated when the valve device is working.

[0080] In addition, in this embodiment, the valve opening 131 is formed on the first seat member 13, and then the first seat member 13 is fixed to the valve seat 11, so that the processing of the valve opening 131 is convenient, the processing difficulty can be reduced, and the processing cost can be saved.

[0081] In one implementation, the first seat component 13 includes an annular seat base 132 and a first extension wall portion 133 extending radially inward from the seat base 132, and the inner circumferential wall of the first extension wall portion 133 encloses the aforementioned valve mouth portion 131, so that the thickness of the first extension wall portion 133 is the axial height M of the valve mouth portion 131.

[0082] The seat base 132 of the first seat member 13 abuts against the flange portion 211, and the cavity wall of the expansion cavity 1P includes the inner peripheral wall of the seat base 132, the lower wall surface of the first extension wall portion 133, and a partial flange top wall surface 2113 of the flange portion 211. It can be understood that the thickness (axial dimension) of the seat base 132 is greater than the thickness of the first extension wall portion 133.

[0083] After the above arrangement, the inner diameter D2 of the expansion chamber 1P is actually the inner diameter of the seat base 132, that is, the inner diameter D2 of the expansion chamber 1P depends on the inner diameter size of the seat base 132 and is only related to the inner diameter size of the seat base 132, which is convenient for controlling the size of the expansion chamber 1P and also convenient for the assembly of the first seat component 13 and the valve seat 11.

[0084] In this embodiment, the valve seat 11 includes a convex ring portion 111 extending radially inward from the circumferential cavity wall of its inner cavity. The inner cavity of the valve seat 11 includes an upper chamber 112 located above the convex ring portion 111 and a lower chamber 113 located below the convex ring portion 111 .

[0085] The outlet pipe 21 is tightly matched with the lower chamber 113, that is, the upper end of the outlet pipe 21 is fixedly inserted into the lower chamber 113. The flange top wall surface 2113 of the flange portion 211 of the outlet pipe 21 abuts against the convex ring bottom wall surface 1111 of the convex ring portion 111.

[0086] The first seat member 13 includes a second extension wall portion 134 extending radially outward from the seat base 132, the lower wall surface of the second extension wall portion 134 abuts against the convex ring top wall surface 1112 of the convex ring portion 111, and the outer peripheral wall of the second extension wall portion 134 is tightly matched with the upper cavity peripheral wall 1121 of the upper chamber 112. The seat base 132 of the first seat member 13 is fixedly inserted into the convex ring portion 111, the outer peripheral wall of the seat base 132 is tightly matched with the inner peripheral wall of the convex ring portion 111, and the lower wall surface of the seat base 132 abuts against the flange top wall surface 2113 of the flange portion 211.

[0087] After the above arrangement, the relative position between the first seat component 13 and the valve seat 11 can be limited by the press-fitting of the seat base 132 and the convex ring portion 111, and the cooperation of the second extending wall portion 134 with the upper chamber 112 and the convex ring portion 111, which is beneficial to ensure the coaxiality of the valve mouth portion 131 formed on the first seat component 13 and the axial center line of the inner cavity of the valve seat 11, thereby ensuring the reliability of the cooperation between the valve needle component 40 and the valve mouth portion 131, and at the same time ensuring the reliability of the connection between the first seat component 13 and the valve seat 11.

[0088] In practical applications, after the first seat component 13 is tightly fitted with the valve seat 11, it can also be fixed by welding to further improve the fixing effect of the first seat component 13 and the valve seat 11, so as to avoid the occurrence of adverse phenomena such as the valve needle component 40 being stuck due to the movement of the first seat component 13 relative to the valve seat 11 after long-term use.

[0089] In other implementation schemes, the circumferential wall of the expansion cavity 1P can also be formed by part of the circumferential wall of the inner cavity of the valve seat 11. The first seat component 13 as a whole is an annular plate structure of equal thickness. There is an axial gap between the first seat component 13 and the flange portion 211. The axial gap is the axial height H1 of the expansion cavity 1P. At this time, at least part of the lower wall surface of the first seat component 13, part of the circumferential wall of the valve seat 11 and the flange top wall surface 2113 of the flange portion 211 can enclose the expansion cavity 1P.

[0090] In practical applications, more than two stepped channel sections 2P may be formed between the second seat member 22 and the outlet pipe 21. In this way, after the refrigerant flows through the expansion cavity 1P, it can also pass through more than two large-diameter channel sections 21P for layer-by-layer expansion and pressure expansion, so as to effectively control the size and number of bubbles and enhance the noise reduction effect of the valve device. Of course, only one stepped channel section 2P may be formed between the second seat member 22 and the outlet pipe 21. The figure takes the example of two stepped channel sections 2P formed between the second seat member 22 and the outlet pipe 21.

[0091] In a specific implementation, the second seat component 22 includes more than two seat portions 221, each seat portion 221 is arranged along the axial direction, a large-diameter channel section 21P is formed between the seat portion 221 closest to the flange portion 211 and the flange portion 211, a large-diameter channel section 21P is formed between two adjacent seat portions 221, and each seat portion 221 has a small-diameter channel section 22P.

[0092] In the illustrated embodiment, each seat portion 221 of the second seat member 22 is separately provided, and two adjacent seat portions 221 abut against each other in the axial direction. The seat portion 221 closest to the flange portion 211 , i.e., the seat portion 221 located at the top, abuts against the flange portion 211 .

[0093] The seat portion 221 has a groove portion 2211 at its upper end, and the seat portion 221 also has a through hole 2212 communicating with the groove portion 2211 , and the through hole 2212 forms a small-diameter channel section 22P.

[0094] The seat portion 221 can be tightly matched with the outlet pipe 21 , and after being tightly matched, they can be connected by welding to improve the reliability of the connection between the seat portion 221 and the outlet pipe 21 .

[0095] Providing each seat portion 221 separately helps to reduce the difficulty of processing.

[0096] After the above arrangement, the inner wall of the groove portion 2211 of the uppermost seat portion 221 and the flange bottom wall surface 2112 of the flange portion 211 enclose a large-diameter channel section 21P, and the large-diameter channel section 21P and the through hole 2212 of the uppermost seat portion 221 form a stepped channel section 2P. Among the two adjacent seat portions 221, part of the lower wall surface of the upper seat portion 221 and the inner wall of the groove portion 2211 of the lower seat portion 221 enclose a large-diameter channel section 21P, and the large-diameter channel section 21P and the through hole 2212 of the lower seat portion 221 form a stepped channel section 2P.

[0097] After the seat portion 221 of the second seat member 22 is set to the above structure, the inner diameter D3 of the large-diameter channel section 21P is actually the inner diameter of the groove portion 2211, and the axial height H2 of the large-diameter channel section 21P is actually the groove depth of the groove portion 2211. It can be understood that the size of the large-diameter channel section 21P is only related to the size of the groove portion 2211 of the seat portion 221, which is beneficial to the size control of the large-diameter channel section 21P during processing.

[0098] In addition, the groove portion 2211 structure provided on the seat portion 221 is also beneficial to the assembly and positioning between the seat portions 221. During assembly, two adjacent seat portions 221 only need to be abutted in the axial direction without providing an additional positioning structure.

[0099] In other embodiments, the second seat component 22 may also be an integral structural component.

[0100] In other embodiments, the seat portion 221 of the second seat component 22 may also be only an annular structure, forming an axial gap between two adjacent seat portions 221, or forming an axial gap between the uppermost seat portion 221 and the flange portion 211 to form a large diameter channel section 21P.

[0101] In one implementation, the axial height H3 of each small-diameter channel section 22P of the valve device is greater than the axial height H1 of the expansion cavity 1P, and in the same step channel section 2P, the axial height H3 of the small-diameter channel section 22P is greater than the axial height H2 of the large-diameter channel section 21P. In this way, after the refrigerant passes through the expansion cavity 1P or the large-diameter channel section 21P during the flow process, it can be rectified through the small-diameter channel section 22P to reduce eddy currents, which is conducive to further suppressing the generation and development of bubbles and further reducing noise.

[0102] In one implementation, the ratio of the inner diameter D2 of the expansion cavity 1P to the aperture of the inner hole 2111 of the flange portion 211 is not less than 3 / 2, and the ratio of the inner diameter D3 of the large diameter channel section 21P to the inner diameter D4 of the small diameter channel section 22P is not less than 3 / 2. In this way, when the refrigerant flows from the valve mouth portion 131 to the outlet pipe 21, the pressure change between the adjacent large diameter cavity section (including the expansion cavity 1P and the large diameter channel section 21P) and the small diameter cavity section (including the inner hole 2111 and the small diameter channel section 22P) can be increased, which is conducive to increasing the pressure of the refrigerant in the large diameter cavity section to suppress the development of bubbles.

[0103] In one implementation, at least part of the structure of the second seat member 22 can be made of a filter material, which has pores. The filter material can be considered to be a porous structure, and the refrigerant can flow through the filter material. In the process of flowing through the filter material, the bubbles in the refrigerant can be broken up and refined by the pores of the filter material, so that the distribution of the gas phase and the liquid phase in the refrigerant is more uniform, which can also help reduce the bubble noise. Exemplarily, the filter material can be prepared by powder metallurgy material, and can also be a metal wire braided structure, and can also be a metal fiber, etc.

[0104] The second seat member 22 can be made of filter material as a whole, or only part of the structural material can be made of filter material. Exemplarily, when the second seat member 22 includes more than two separate seat parts 221, part of the seat parts 221 can be made of filter material, or all of the seat parts 221 can be made of filter material.

[0105] In one implementation, the axial center lines of the valve opening 131, the inner hole 2111 and each small-diameter channel section 22P coincide, and the aperture of the inner hole 2111 and the inner diameter D4 of the small-diameter channel section 22P are not less than the inner diameter D1 of the valve opening 131. In this way, the setting of the inner hole 2111 and the small-diameter channel section 22P will not affect the throttling effect of the valve opening 131. At the same time, when the valve needle 41 of the valve needle component 40 extends into the valve opening 131 and abuts against the valve opening 131 for sealing, the setting of the inner hole 2111 and the small-diameter channel section 22P will not interfere with the valve needle 41, and can be combined with Figure 1 understand.

[0106] Specific examples are used herein to illustrate the principles and implementation methods of the present application, and the description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A valve device, characterized in that It includes a valve seat, a first seat component, a second seat component and an outlet pipe; The upper end of the outlet pipe is fixedly inserted into the valve seat, and the upper end of the outlet pipe is folded inward to form an annular flange portion; The first seat member and the second seat member are respectively arranged on both sides of the flange portion, the first seat member is fixedly arranged in the inner cavity of the valve seat, and the second seat member is fixedly arranged in the tube cavity of the outlet pipe; The first seat member has a valve opening, an expansion cavity is formed between the first seat member and the flange, the expansion cavity communicates with the valve opening and the inner hole of the flange, and the diameter of the inner hole is smaller than the inner diameter of the expansion cavity; At least one stepped channel section is formed between the second seat member and the outlet pipe, and the stepped channel section is connected to the inner hole; the stepped channel section includes a large-diameter channel section and a small-diameter channel section that are connected to each other, the large-diameter channel section is located above the small-diameter channel section, and at least part of the flange bottom wall surface of the flange portion constitutes a part of the channel wall of the large-diameter channel section; The axial height of the valve mouth is M, M≤1mm; The inner diameter of the valve mouth is D1, the axial height of the expansion cavity is H1, the inner diameter of the expansion cavity is D2, H1≤(1 / 3)D2, D2>D1; The axial height of the large-diameter channel section is H2, the inner diameter of the large-diameter channel section is D3, and H2≤(1 / 3)D3.

2. The valve device according to claim 1, characterized in that The first seat member includes an annular seat base and a first extending wall portion extending radially inward from the seat base; The inner peripheral wall of the first extending wall portion encloses the valve opening portion, and the thickness of the first extending wall portion is the axial height of the valve opening portion; The seat base is in contact with the flange portion, and the cavity wall of the expansion cavity includes an inner peripheral wall of the seat base, a lower wall surface of the first extending wall portion, and a partial flange top wall surface of the flange portion.

3. The valve device according to claim 2, characterized in that The valve seat comprises a convex ring portion extending radially inward from the circumferential cavity wall of the inner cavity, and the inner cavity comprises an upper chamber located above the convex ring portion and a lower chamber located below the convex ring portion; The outlet pipe is tightly matched with the lower chamber, and the flange top wall surface of the flange portion abuts against the convex ring bottom wall surface of the convex ring portion; The first seat member includes a second extension wall portion extending radially outward from the seat base; the lower wall surface of the second extension wall portion abuts against the convex ring top wall surface of the convex ring portion, and the outer peripheral wall of the second extension wall portion is tightly matched with the upper cavity peripheral wall of the upper cavity; The outer peripheral wall of the seat base is tightly matched with the inner peripheral wall of the convex ring part, and the lower wall surface of the seat base is in contact with the flange top wall surface of the flange part.

4. The valve device according to claim 1, characterized in that More than two stepped channel sections are formed between the second seat component and the outlet pipe.

5. The valve device according to claim 4, characterized in that The second seat member comprises more than two seat parts, the more than two seat parts are arranged along the axial direction, a large-diameter channel section is formed between the seat part closest to the flange part and the flange part, and a large-diameter channel section is formed between two adjacent seat parts; Each of the seat portions has the small-diameter channel section.

6. The valve device according to claim 5, characterized in that Each of the seat portions is separately arranged, two adjacent seat portions abut against each other in the axial direction, and the seat portion closest to the flange portion abuts against the flange portion; The upper end of the seat portion has a groove portion, and the seat portion also has a through hole communicated with the groove portion, and the through hole is the small-diameter channel section.

7. The valve device according to any one of claims 1 to 6, characterized in that: The axial height of each of the small-diameter channel sections is greater than the axial height of the expansion cavity; In the same stepped channel section, the axial height of the small-diameter channel section is greater than the axial height of the large-diameter channel section.

8. The valve device according to any one of claims 1 to 6, characterized in that: The ratio of the inner diameter of the expansion cavity to the aperture of the inner hole is not less than 3 / 2, and the ratio of the inner diameter of the large-diameter channel section to the inner diameter of the small-diameter channel section is not less than 3 / 2.

9. The valve device according to any one of claims 1 to 6, characterized in that: At least a portion of the second seat component is made of filter material.

10. The valve device according to any one of claims 1 to 6, characterized in that: The axial center lines of the valve mouth, the inner hole and the small-diameter channel section coincide with each other, and the aperture of the inner hole and the inner diameter of the small-diameter channel section are not less than the inner diameter of the valve mouth.

11. The valve device according to any one of claims 1 to 6, characterized in that: The valve device is used in a refrigeration system.

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