Valve device

Abstract

The valve device comprises a valve body component, the valve body component comprises a valve seat and a seat component, and the seat component is fixedly arranged in an inner cavity of the valve seat; the valve seat comprises a flange part which extends inwards in the radial direction from the circumferential cavity wall of the inner cavity, the seat component is located above the flange part, and the seat component is provided with a valve port part communicated with the inner cavity; at least one step channel section is formed between the valve seat and the seat component, is positioned below the valve port part and is communicated with the valve port part; the step channel section comprises a large-diameter channel section and a small-diameter channel section which are communicated with each other, and the large-diameter channel section is located above the small-diameter channel section; an inner hole of the flange part forms a small-diameter channel section, and at least part of a flange top wall surface of the flange part forms part of a channel wall of a 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 large-diameter channel section is H1, the inner diameter of the large-diameter channel section is D2, H1 is smaller than or equal to (1 / 3) D2, and D2 is larger than D1. 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 body component, wherein the valve body component includes a valve seat and a seat component, and the seat component is fixedly arranged in the inner cavity of the valve seat;

[0007] The valve seat comprises a flange portion extending radially inward from the circumferential cavity wall of the inner cavity, the seat member is located above the flange portion, and the seat member has a valve port portion communicating with the inner cavity;

[0008] At least one stepped channel section is formed between the valve seat and the seat member, the stepped channel section is located below the valve opening and communicated with the valve opening; the stepped channel section includes a large-diameter channel section and a small-diameter channel section that communicate with each other, the large-diameter channel section is located above the small-diameter channel section; the inner hole of the flange portion forms one of the small-diameter channel sections, and at least a portion of the flange top wall surface of the flange portion constitutes a portion of the channel wall of the large-diameter channel section;

[0009] The axial height of the valve mouth is M, M≤1mm;

[0010] The inner diameter of the valve mouth portion is D1, the axial height of the large-diameter channel section is H1, the inner diameter of the large-diameter channel section is D2, H1≤(1 / 3)D2, D2>D1.

[0011] In one feasible solution, the seat member includes at least one annular plate portion, the through hole section of the annular plate portion forms the valve mouth portion or the small-diameter channel section, and at least part of the upper plate wall surface or at least part of the lower plate wall surface of the annular plate portion constitutes at least part of the channel wall of the large-diameter channel section.

[0012] In one feasible solution, the seat member includes a ring base, and the annular plate portion extends radially inward from the inner peripheral wall of the ring base;

[0013] The inner cavity comprises an upper chamber located above the flange portion, and the outer peripheral wall of the ring base is tightly matched with the circumferential cavity wall of the upper chamber.

[0014] In a feasible solution, the seat member is an integral structure, and the seat member includes more than two annular plate portions, and the two annular plate portions are arranged at intervals along the axial direction of the ring base.

[0015] In one feasible solution, the bottom wall of the upper chamber is the flange top wall surface of the flange portion;

[0016] The ring base comprises a lower convex base segment, the annular plate portion which is closest to the flange portion is located above the lower convex base segment, the flange top wall surface of the flange portion has a limiting groove, and the lower convex base segment is inserted into the limiting groove;

[0017] Part of the flange top wall surface of the flange portion and part of the inner peripheral wall of the lower convex base section constitute a partial channel wall of the large-diameter channel section.

[0018] In an achievable solution, the inner cavity includes a lower cavity located below the flange portion, the lower cavity includes a first lower cavity section and a second lower cavity section, the inner diameter of the first lower cavity section is smaller than the inner diameter of the second lower cavity section, and the first lower cavity section is located above the second lower cavity section;

[0019] The valve device comprises an outlet pipe, the upper pipe end surface of the outlet pipe abuts against the cavity top wall of the second lower cavity section, and the outer pipe wall of the outlet pipe is tightly matched with the circumferential cavity wall of the second lower cavity section;

[0020] The inner diameter of the first lower chamber section is smaller than the inner diameter of the outlet connecting pipe.

[0021] In a feasible solution, 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.

[0022] In a feasible solution, there are more than two stepped channel sections, and among the small-diameter channel sections, the small-diameter channel section formed by the inner hole of the flange portion has the largest axial height.

[0023] In a feasible solution, 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.

[0024] In a feasible solution, the axial center lines of the valve mouth portion and the small-diameter channel section coincide with each other, and the inner diameter of the small-diameter channel section is not less than the inner diameter of the valve mouth portion.

[0025] The valve device provided in the embodiment of the present application sets the axial height of the valve mouth to be no more than 1 mm, which can effectively suppress the initiation and development of bubbles and has a positive effect on reducing bubble noise; the large-diameter channel section in the step channel section connected to the valve mouth and located below the valve mouth is set to a flat structure, so that when the refrigerant flows into the large-diameter channel section, the pressure can rise 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, and 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

[0026] FIG1 is a cross-sectional schematic diagram of a valve device according to an embodiment of the present application;

[0027] FIG2 is a partial enlarged view of the portion A in FIG1 ;

[0028] FIG3 is a partial cross-sectional schematic diagram of the valve seat in FIG1 ;

[0029] FIG. 4 is a schematic cross-sectional view of the seat component in FIG. 2 .

[0030] Description of reference numerals:

[0031] Valve body component 10, valve seat 11, flange portion 111, inner hole 1111, flange top wall surface 1112, flange bottom wall surface 1113, limiting groove 1114, upper chamber 112, first upper chamber section 1121, second upper chamber section 1122, lower chamber 113, first lower chamber section 1131, second lower chamber section 1132, guide seat 12, seat member 13, valve mouth portion 131, annular plate portion 132, through hole section 1321, ring base 133, lower convex base section 1331, step channel section 14, large diameter channel section 141, small diameter channel section 142;

[0032] Import pipe 20, export pipe 30;

[0033] Valve needle component 40, valve needle 41, sleeve portion 42, elastic member 43, support component 44, fixing member 45, sleeve cover 46;

[0034] Screw 50;

[0035] Nut 60, connecting piece 61;

[0036] Rotor component 70, magnetic rotor 71, connecting plate 72;

[0037] Cover 81, valve housing 82. DETAILED DESCRIPTION

[0038] 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.

[0039] 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.

[0040] 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.

[0041] Please refer to FIG. 1 , which is a cross-sectional schematic diagram of a valve device in an embodiment provided in the present application.

[0042] In this embodiment, the valve device can be an electronic expansion valve or an electric valve, and the valve device can be applied to a refrigeration system. The valve device includes a valve body component 10, an inlet pipe 20, an outlet pipe 30, a valve needle component 40, a screw rod 50, a nut 60, a rotor component 70, and a valve housing 82.

[0043] The valve body component 10 has a valve port 131 (indicated in FIG. 2 ), and the valve body component 10 is fixedly connected with an inlet pipe 20 and an outlet pipe 30, and the inlet pipe 20 and the outlet pipe 30 are connected through the valve port 131. The inlet pipe 20 and the outlet pipe 30 can be fixedly connected to the valve body component 10 by interference fit, welding, or a combination of interference fit and welding.

[0044] In use, the refrigerant flows into the valve body component 10 from the inlet pipe 20, passes through the valve port 131, and flows out from the outlet pipe 30. The inlet pipe 20 is connected to the circumference of the valve body component 10, and the outlet pipe 30 is connected to the bottom of the valve body component 10.

[0045] The valve housing 82 is fixedly connected to the upper end of the valve body component 10, and 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. As shown in FIG. 1, the valve device further includes a cover 81, which is fixedly connected to the upper end of the valve body component 10, and the valve housing 82 is fixedly connected to the cover 81.

[0046] 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).

[0047] 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 .

[0048] 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, so as to close or open the valve port 131.

[0049] In the example shown in FIG. 1 , the nut 60 can 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 in a circumferential direction.

[0050] 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 .

[0051] 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.

[0052] 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.

[0053] 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.

[0054] In a specific implementation, the valve body component 10 may include a valve seat 11 and a guide seat 12. The guide seat 12 is fixed to the inner cavity of the valve seat 11. The guide seat 12 can guide the valve needle 41 to ensure the accuracy of the axial movement of the valve needle 41. The guide seat 12 can also guide the sleeve portion 42 to ensure the accuracy of the axial movement of the sleeve portion 42. The inlet pipe 20 and the outlet pipe 30 are both fixedly connected to the valve seat 11.

[0055] FIG1 is only an exemplary embodiment of a specific structure of a valve device. 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.

[0056] 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.

[0057] Please refer to Figures 2 to 4, Figure 2 is a partial enlarged view of the A portion in Figure 1, Figure 3 is a partial cross-sectional schematic view of the valve seat in Figure 1, and Figure 4 is a cross-sectional schematic view of the seat component in Figure 2. In order to clearly illustrate the structure of the area where the valve port 131 is located, the valve needle 41 is hidden in Figure 2.

[0058] In this embodiment, the valve body component 10 of the valve device further includes a seat member 13 , and the seat member 13 is fixedly disposed in the inner cavity of the valve seat 11 .

[0059] The valve seat 11 includes a flange portion 111 extending radially inward from a circumferential cavity wall of the inner cavity thereof. The seat member 13 is located above the flange portion 111 . The seat member 13 has a valve port portion 131 communicating with the inner cavity of the valve seat 11 .

[0060] At least one stepped channel section 14 is formed between the valve seat 11 and the seat member 13. The stepped channel section 14 is located below the valve mouth portion 131 and is connected to the valve mouth portion 131. The stepped channel section 14 includes a large-diameter channel section 141 and a small-diameter channel section 142 that are connected to each other. The large-diameter channel section 141 is located above the small-diameter channel section 142.

[0061] The inner hole 1111 of the flange portion 111 forms a small-diameter channel section 142 , and at least a portion of the flange top wall surface 1112 of the flange portion 111 constitutes a partial channel wall of the large-diameter channel section 141 .

[0062] The inner cavity of the valve seat 11 includes an upper chamber 112 located above the flange portion 111 , and the inlet pipe 20 is in communication with the upper chamber 112 of the valve seat 11 . Specifically, the inlet pipe 20 is in communication with a region of the upper chamber 112 located above the seat member 13 .

[0063] After the above arrangement, the refrigerant flows into the valve seat 11 from the inlet pipe 20 , and then flows through the valve port 131 and each step channel section 14 in sequence, and then flows out from the outlet pipe 30 .

[0064] In this embodiment, the axial height of the valve mouth 131 is M, M≤1 mm. The inner diameter of the valve mouth 131 is D1, the axial height of the large diameter channel section 141 is H1, the inner diameter of the large diameter channel section 141 is D2, H1≤(1 / 3)D2, D2>D1.

[0065] After research and analysis, it is known that bubbles are easily generated when the refrigerant flows through the valve mouth part 131, and the bubbles are easily generated close to the inner wall surface of the valve mouth part 131, and grow and develop in the axial channel formed by the valve mouth part 131. As mentioned above, setting the axial height M of the valve mouth part 131 to no more than 1 mm can effectively inhibit the generation and development of bubbles, which has a positive effect on reducing bubble noise.

[0066] At the same time, the inner diameter D2 and axial height H1 of the large diameter channel section 141 of the step channel section 14 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 large diameter channel section 141 has a flat structure. In this way, when the refrigerant flows out of the valve mouth portion 131 and flows through each step channel section 14, it flows from the small diameter cavity section with a relatively small inner diameter (the valve mouth portion 131 or the small diameter channel section 142) into the large diameter cavity section with a relatively large inner diameter (the large diameter channel section 141). Due to the sudden increase in the flow area and the flat structure of the large diameter channel section 141, the pressure of the refrigerant in the large diameter channel section 141 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.

[0067] In addition, in this embodiment, the valve mouth portion 131 is formed on the seat member 13, and then the seat member 13 is fixed to the valve seat 11. This facilitates the processing of the valve mouth portion 131, reduces the processing difficulty, and saves processing costs.

[0068] In one implementation, the seat member 13 includes at least one annular plate portion 132, the through hole section 1321 of the annular plate portion 132 forms a valve mouth portion 131 or a small-diameter channel section 142, and at least a portion of the upper plate wall surface or at least a portion of the lower plate wall surface of the annular plate portion 132 constitutes at least a portion of the channel wall of a large-diameter channel section 141.

[0069] When the seat member 13 has only one annular plate portion 132 , the through hole section 1321 of the annular plate portion 132 forms the valve port portion 131 .

[0070] When the seat member 13 is provided with more than two annular plate portions 132, the annular plate portions 132 are arranged at intervals in the axial direction, wherein the through hole section 1321 of the annular plate portion 132 which is farthest from the flange portion 111 or located at the top forms the valve mouth portion 131, and the through hole sections 1321 of the other annular plate portions 132 form a small-diameter channel section 142, a large-diameter channel section 141 is formed between two adjacent annular plate portions 132, and a large-diameter channel section 141 is also formed between the annular plate portion 132 which is closest to the flange portion 111 or located at the bottom and the flange portion 111.

[0071] In a specific application, the seat member 13 includes a ring base 133, and the annular plate portion 132 extends radially inward from the inner peripheral wall of the ring base 133. The seat member 13 can be fixedly connected to the valve seat 11 through the ring base 133. The outer peripheral wall of the ring base 133 can be tightly matched with the circumferential cavity wall of the upper chamber 112 located above the flange portion 111.

[0072] In this embodiment, the seat member 13 is an integral structural member, and the seat member 13 is provided with more than two annular plate portions 132, and the annular plate portions 132 are arranged at intervals along the axial direction of the ring base 133. In this way, the assembly of the seat member 13 and the valve seat 11 is convenient, and the relative position of the valve port portion 131 formed in the seat member 13 and the valve seat 11 is conveniently controlled.

[0073] After the above arrangement, the inner diameter of each of the large diameter channel sections 141 is the inner diameter of the ring base 133. Except for the lowermost large diameter channel section 141, the axial height H1 of the remaining large diameter channel sections 141 is related to the axial spacing between two adjacent annular plate portions 132. Except for the small diameter channel section 142 formed by the inner hole 1111 of the flange portion 111, the axial height H2 of the remaining small diameter channel sections 142 is the thickness of the annular plate portion 132. The seat member 13 is set as an integral structural member, which is convenient for controlling the size of the large diameter channel section 141 and the small diameter channel section 142.

[0074] In other embodiments, the seat member 13 may also be a split component, for example, including a plurality of independent annular plates, each of which is axially fixed in the upper chamber 112, and each annular plate is arranged at intervals in the axial direction, so that two adjacent annular plates and part of the circumferential cavity wall of the upper chamber 112 enclose a large-diameter channel section 141, and the through hole of the annular plate forms a small-diameter channel section 142.

[0075] The bottom wall of the upper chamber 112 is the flange top wall surface 1112 of the flange portion 111. In this embodiment, the ring base 133 of the seat member 13 includes a lower convex base segment 1331, which is located below the lowest annular plate portion 132, that is, the annular plate portion 132 closest to the flange portion 111 is located above the lower convex base segment 1331, and a limiting groove 1114 can be provided on the flange top wall surface 1112 of the flange portion 111. After the seat member 13 is tightly fitted in the upper chamber 112, the lower convex base segment 1331 is inserted into the limiting groove 1114. Such a configuration has a better positioning effect on the seat member 13.

[0076] After being assembled as above, part of the flange top wall surface 1112 of the flange portion 111 and part of the inner peripheral wall of the lower convex base section 1331 constitute a part of the channel wall of the large-diameter channel section 141 .

[0077] In a specific implementation, the upper chamber 112 of the valve seat 11 includes a first upper chamber section 1121 and a second upper chamber section 1122, the inner diameter of the first upper chamber section 1121 is smaller than the inner diameter of the second upper chamber section 1122, the first upper chamber section 1121 is located below the second upper chamber section 1122, and the cavity bottom wall of the upper chamber 112 is the cavity bottom wall of the first upper chamber section 1121, that is, the cavity bottom wall of the first upper chamber section 1121 is also the flange top wall surface 1112 of the flange portion 111. The seat member 13 is specifically tightly matched with the first upper chamber section 1121.

[0078] In application, after the seat member 13 and the first upper cavity section 1121 are tightly matched, they can also be fixed by welding to improve the fixing effect of the seat member 13 and the valve seat 11.

[0079] In this embodiment, the inner cavity of the valve seat 11 further includes a lower chamber 113 located below the flange portion 111, and the lower chamber 113 includes a first lower chamber section 1131 and a second lower chamber section 1132. The inner diameter of the first lower chamber section 1131 is smaller than the inner diameter of the second lower chamber section 1132, and the first lower chamber section 1131 is located above the second lower chamber section 1132. In this way, the cavity top wall of the first lower chamber section 1131 is the flange bottom wall surface 1113 of the flange portion 111.

[0080] The outlet pipe 30 of the valve device is fixedly inserted in the lower chamber 113, and specifically fits tightly with the second lower chamber section 1132, that is, the outer tube wall of the outlet pipe 30 fits tightly with the circumferential cavity wall of the second lower cavity section 1132. The upper tube end surface of the outlet pipe 30 abuts against the cavity top wall of the second lower cavity section 1132 to limit the length of the outlet pipe 30 inserted into the lower chamber 113, and to limit the outlet pipe 30.

[0081] In the specific setting, the inner diameter of the first lower cavity section 1131 is smaller than the inner diameter of the outlet pipe 30. In this way, after the refrigerant flows out of the step channel section 14, it first flows into the first lower cavity section 1131 with a larger inner diameter, and then flows into the outlet pipe 30 with a larger inner diameter than the first lower cavity section 1131, which is conducive to the stability of the refrigerant outflow process and also helps to reduce noise.

[0082] In one implementation, in the same stepped channel section 14, the axial height H2 of the small-diameter channel section 142 is set to be greater than the axial height H1 of the large-diameter channel section 141. In this way, the refrigerant flow process is that after the expansion pressure of the large-diameter channel section 141, it can be rectified through the small-diameter channel section 142 to reduce eddy currents, which is conducive to further suppressing the generation and development of bubbles and further reducing noise.

[0083] In a specific implementation, when there are more than two stepped channel sections 14, the small-diameter channel section 142 formed by the inner hole 1111 of the flange portion 111 is the last small-diameter channel section 142 when the refrigerant flows toward the outlet pipe 30. In each small-diameter channel section 142, the axial height H2' of the inner hole 1111 of the flange portion 111 is the largest. This arrangement can make the refrigerant have a better rectification effect before flowing into the outlet pipe 30.

[0084] In one implementation, the ratio of the inner diameter D2 of the large diameter channel section 141 to the inner diameter D3 of the small diameter channel section 142 is set to be not less than 3 / 2. In this way, when the refrigerant flows from the valve port 131 to the outlet pipe 30, the pressure change between the large diameter channel section 141 and the small diameter channel section 142 can be increased, which is conducive to increasing the pressure of the refrigerant in the large diameter channel section 141 to suppress the development of bubbles.

[0085] In one implementation, the axial center lines of the valve opening 131 and each small-diameter channel section 142 coincide, and the inner diameter D3 of the small-diameter channel section 142 is not less than the inner diameter D1 of the valve opening 131. In this way, the setting of the small-diameter channel section 142 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 to seal, the setting of the small-diameter channel section 142 will not interfere with the valve needle 41, which can be understood in conjunction with FIG. 1.

[0086] 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 The valve body comprises a valve seat and a seat component, wherein the seat component is fixedly arranged in the inner cavity of the valve seat; The valve seat comprises a flange portion extending radially inward from the circumferential cavity wall of the inner cavity, the seat member is located above the flange portion, and the seat member has a valve port portion communicating with the inner cavity; At least one stepped channel section is formed between the valve seat and the seat member, the stepped channel section is located below the valve opening and communicated with the valve opening; the stepped channel section includes a large-diameter channel section and a small-diameter channel section that communicate with each other, the large-diameter channel section is located above the small-diameter channel section; the inner hole of the flange portion forms one of the small-diameter channel sections, and at least a portion of the flange top wall surface of the flange portion constitutes a portion 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 portion is D1, the axial height of the large-diameter channel section is H1, the inner diameter of the large-diameter channel section is D2, H1≤(1 / 3)D2, D2>D1.

2. The valve device according to claim 1, characterized in that The seat member includes at least one annular plate portion, the through hole section of the annular plate portion forms the valve mouth portion or the small diameter channel section, and at least part of the upper plate wall surface or at least part of the lower plate wall surface of the annular plate portion constitutes at least part of the channel wall of the large diameter channel section.

3. The valve device according to claim 2, characterized in that The seat member includes a ring base, and the annular plate portion extends radially inward from the inner peripheral wall of the ring base; The inner cavity comprises an upper chamber located above the flange portion, and the outer peripheral wall of the ring base is tightly matched with the circumferential cavity wall of the upper chamber.

4. The valve device according to claim 3, characterized in that The seat component is an integral structure, and includes more than two annular plate portions, and the two annular plate portions are arranged at intervals along the axial direction of the ring base.

5. The valve device according to claim 3, characterized in that The bottom wall of the upper chamber is the flange top wall surface of the flange portion; The ring base comprises a lower convex base segment, the annular plate portion which is closest to the flange portion is located above the lower convex base segment, the flange top wall surface of the flange portion has a limiting groove, and the lower convex base segment is inserted into the limiting groove; Part of the flange top wall surface of the flange portion and part of the inner peripheral wall of the lower convex base section constitute a partial channel wall of the large-diameter channel section.

6. The valve device according to claim 1, characterized in that The inner cavity includes a lower cavity located below the flange portion, the lower cavity includes a first lower cavity section and a second lower cavity section, the inner diameter of the first lower cavity section is smaller than the inner diameter of the second lower cavity section, and the first lower cavity section is located above the second lower cavity section; The valve device comprises an outlet pipe, the upper pipe end surface of the outlet pipe abuts against the cavity top wall of the second lower cavity section, and the outer pipe wall of the outlet pipe is tightly matched with the circumferential cavity wall of the second lower cavity section; The inner diameter of the first lower chamber section is smaller than the inner diameter of the outlet connecting pipe.

7. The valve device according to any one of claims 1 to 6, characterized in that: 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 claim 7, characterized in that There are more than two stepped channel sections, and among the small-diameter channel sections, the small-diameter channel section formed by the inner hole of the flange portion has the largest axial height.

9. The valve device according to any one of claims 1 to 6, characterized in that: 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.

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

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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