Valve device

Abstract

The present application discloses a valve device, comprising a valve seat and a first and a second fixed seat, both of which are fixedly connected to the valve seat; the valve seat is provided with a flange portion, the first fixed seat and the second fixed seat are respectively arranged above and below the flange portion, the first fixed seat has a valve mouth portion, a primary expansion cavity is formed between the first fixed seat and the flange portion, and the inner diameter of the primary expansion cavity is greater than the aperture of the inner hole of the flange portion; at least one step channel section connected to the inner hole is formed between the second fixed seat and the lower chamber of the valve seat, the large-diameter channel section of the step 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 M of the valve mouth portion is ≤1mm; the inner diameter of the valve mouth portion is D1, the axial height of the primary expansion cavity is H1, the inner diameter is D2, H1≤(1 / 3)D2, D2>D1; the axial height of the large-diameter channel section is H2, the inner diameter is D3, H2≤(1 / 3)D3. The refrigerant noise of the valve device is small.

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, a first fixed seat and a second fixed seat, wherein the first fixed seat and the second fixed seat are both fixedly connected to the valve seat;

[0007] The valve seat has an inner cavity, and the valve seat includes a flange portion, and the flange portion extends radially inward from the circumferential cavity wall of the inner cavity;

[0008] The first fixing seat is located above the flange portion, the first fixing seat has a valve opening portion communicating with the inner cavity, a primary expansion cavity is formed between the first fixing seat and the flange portion, the primary expansion cavity communicates with the valve opening portion and the inner hole of the flange portion, and the inner diameter of the primary expansion cavity is greater than the aperture of the inner hole;

[0009] The inner cavity includes a lower chamber located below the flange portion, the second fixing seat is located below the flange portion and is tightly matched with the lower chamber, at least one stepped channel section is formed between the second fixing seat and the lower chamber, 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 a portion of the flange bottom wall surface of the flange portion constitutes a partial channel wall of the large-diameter channel section;

[0010] The axial height of the valve mouth is M, M≤1mm;

[0011] The inner diameter of the valve mouth is D1, the axial height of the primary expansion cavity is H1, the inner diameter of the primary expansion cavity is D2, H1≤(1 / 3)D2, D2>D1;

[0012] 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.

[0013] In an achievable solution, the first fixing seat comprises an annular seat base and a first extending wall portion extending radially inward from the seat base;

[0014] 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;

[0015] The seat base is in contact with the flange portion, and the cavity wall of the primary expansion cavity includes an inner peripheral wall of the seat base, a lower wall surface of the first extension wall portion, and a partial flange top wall surface of the flange portion.

[0016] In an achievable solution, the inner cavity includes an upper cavity located above the flange portion, the upper cavity includes a first cavity and a second cavity, the first cavity is located above the second cavity, and the inner diameter of the first cavity is greater than the inner diameter of the second cavity;

[0017] The first fixing seat comprises a second extending wall portion extending radially outward from the seat base, the lower wall surface of the second extending wall portion abuts against the first cavity bottom wall of the first cavity, and the outer peripheral wall of the second extending wall portion is tightly matched with the first cavity peripheral wall of the first cavity;

[0018] The outer peripheral wall of the seat base is tightly matched with the second peripheral wall of the second cavity.

[0019] In one feasible solution, the lower chamber includes a third chamber, the top wall of the third chamber is the flange bottom wall of the flange portion, at least part of the second fixing seat is located in the third chamber, and the second fixing seat is tightly matched with the third chamber.

[0020] In an achievable solution, at least part of the flange bottom wall of the flange portion and part of the wall surface of the second fixing seat enclose a mid-level expansion cavity, or the flange bottom wall of the flange portion, at least part of the cavity peripheral wall of the third cavity and part of the wall surface of the second fixing seat enclose a mid-level expansion cavity;

[0021] The second fixing seat has a rectifying hole section connected to the intermediate expansion cavity, and the intermediate expansion cavity and the rectifying hole section constitute a stepped channel section.

[0022] In one feasible solution, the upper end surface of the second fixing seat abuts against the flange bottom wall surface of the flange portion, and the upper end of the second fixing seat has a groove portion, and the inner groove wall of the groove portion and part of the flange bottom wall surface of the flange portion enclose the intermediate expansion cavity.

[0023] In one feasible solution, the lower chamber includes a fourth chamber located below the third chamber, and the inner diameter of the fourth chamber is greater than the inner diameter of the third chamber;

[0024] The lower end of the second fixing seat has a stop convex portion extending radially outward, and the convex portion top wall surface of the stop convex portion abuts against the fourth cavity top wall of the fourth cavity.

[0025] In a feasible solution, the valve device also includes an outlet pipe, the upper end of which is inserted into the fourth chamber, the outlet pipe is tightly fitted with the fourth chamber, and the upper tube end wall of the outlet pipe abuts against the lower end surface of the second fixing seat.

[0026] In a feasible solution, at least a part of the structure of the second fixing seat is made of filter material.

[0027] In an achievable 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;

[0028] And / or, in the same step channel section, the axial height of the small-diameter channel section is greater than the axial height of the large-diameter channel section.

[0029] 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 inhibit the birth and development of bubbles and has a positive effect on reducing bubble noise; the primary expansion cavity connected to the valve mouth and located below the valve mouth, and the large-diameter channel section located in the step channel section below the flange portion are both set to a flat structure, so that when the refrigerant flows into the primary expansion cavity or 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 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

[0030] Figure 1 A cross-sectional schematic diagram of a valve device in an embodiment provided in the present application;

[0031] Figure 2 for Figure 1 A partial enlargement of the middle A Figure 1 ;

[0032] Figure 3 for Figure 1 A partial enlargement of the middle A Figure 2 ;

[0033] Figure 4 for Figure 1 A partial cross-sectional diagram of the middle valve seat;

[0034] Figure 5 for Figure 2 A cross-sectional schematic diagram of the first fixing seat;

[0035] Figure 6 for Figure 2 A cross-sectional schematic diagram of the second fixing seat.

[0036] Description of reference numerals:

[0037] Valve body component 10, valve seat 11, flange portion 111, inner hole 1111, flange top wall surface 1112, flange bottom wall surface 1113, upper chamber 112, first chamber 1121, first chamber bottom wall 11211, first chamber peripheral wall 11212, second chamber 1122, second chamber peripheral wall 11222, lower chamber 113, third chamber 1131, fourth chamber 1132, fourth chamber top wall 11321, fourth chamber peripheral wall 11322;

[0038] Guide seat 12;

[0039] A first fixed seat 13, a valve mouth portion 131, a seat base 132, a first extending wall portion 133, and a second extending wall portion 134;

[0040] The second fixing seat 14 has a groove portion 141 , a rectifying hole section 142 , a stop convex portion 143 , a convex portion top wall surface 1431 , and a convex portion outer peripheral wall 1432 ;

[0041] Step channel section 15, large diameter channel section 151, small diameter channel section 152;

[0042] Import pipe 20, export pipe 30;

[0043] Valve needle component 40, valve needle 41, sleeve portion 42, elastic member 43, support component 44, fixing member 45, sleeve cover 46;

[0044] Screw 50;

[0045] Nut 60, connecting piece 61;

[0046] Rotor component 70, magnetic rotor 71, connecting plate 72;

[0047] Cover 81, valve housing 82;

[0048] Primary cavity expansion 1P, intermediate cavity expansion 2P. DETAILED DESCRIPTION

[0049] 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.

[0050] 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.

[0051] 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.

[0052] Please refer to Figure 1 , Figure 1 A cross-sectional schematic diagram of a valve device in an embodiment provided in the present application.

[0053] 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.

[0054] 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 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.

[0055] 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.

[0056] 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 .

[0057] 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).

[0058] 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 .

[0059] 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.

[0060] 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.

[0061] 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 .

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] Please refer to Figures 2 to 6 , Figure 2 for Figure 1 A partial enlargement of the middle A Figure 1 , Figure 3 for Figure 1 A partial enlargement of the middle A Figure 2 , Figure 4 for Figure 1 Partial cross-sectional diagram of the middle valve seat. Figure 5 for Figure 2 A cross-sectional schematic diagram of the first fixing seat in FIG. Figure 6 for Figure 2 To clearly illustrate the structure of the area where the valve port portion 131 is located, Figure 2 and Figure 3 The valve needle 41 is hidden.

[0069] In this embodiment, the valve body component 10 of the valve device further includes a first fixing seat 13 and a second fixing seat 14 . The first fixing seat 13 and the second fixing seat 14 are both fixedly connected to the valve seat 11 .

[0070] The valve seat 11 has an inner cavity, and includes a flange portion 111 . The flange portion 111 extends radially inward from a circumferential cavity wall of the inner cavity.

[0071] The first fixed seat 13 is located above the flange portion 111. The first fixed seat 13 has a valve mouth portion 131 connected to the inner cavity of the valve seat 11. A primary expansion cavity 1P is formed between the first fixed seat 13 and the flange portion 111. The primary expansion cavity 1P connects the valve mouth portion 131 and the inner hole 1111 of the flange portion 111. The inner diameter of the primary expansion cavity 1P is larger than the aperture of the inner hole 1111.

[0072] The inner cavity of the valve seat 11 includes a lower chamber 113 located below the flange portion 111, and the second fixed seat 14 is located below the flange portion 111 and is tightly fitted with the lower chamber 113. At least one step channel section 15 is formed between the second fixed seat 14 and the lower chamber 113, and the step channel section 15 is connected to the inner hole 1111. The step channel section 15 includes a large-diameter channel section 151 and a small-diameter channel section 152 that are connected to each other. The large-diameter channel section 151 is located above the small-diameter channel section 152, that is, the large-diameter channel section 151 is closer to the valve mouth portion 131 relative to the small-diameter channel section 152.

[0073] At least part of the flange bottom wall surface 1113 of the flange portion 111 constitutes a part of the channel wall of the large-diameter channel section 151. Thus, the inner diameter of the large-diameter channel section 151 is greater than the aperture of the inner hole 1111 of the flange portion 111.

[0074] The inner cavity of the valve seat 11 further 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 the region of the upper chamber 112 located above the first fixed seat 13 .

[0075] After the above arrangement, after the refrigerant flows into the valve seat 11 from the inlet pipe 20 , it can flow through the valve mouth portion 131 , the primary expansion cavity 1P, the inner hole 1111 of the flange portion 111 and each step channel section 15 in sequence, and then flow out from the outlet pipe 30 .

[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 primary expansion cavity 1P is H1, the inner diameter of the primary expansion cavity 1P is D2, H1≤(1 / 3)D2, D2>D1. The axial height of the large diameter channel section 151 is H2, the inner diameter of the large diameter channel section 151 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 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.

[0078] At the same time, the inner diameter and axial height of the primary 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 primary expansion chamber 1P has a flat structure. In this way, when the refrigerant flows into the primary expansion chamber 1P from the valve mouth portion 131, it flows from the small-diameter cavity section with a relatively small inner diameter to 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 primary expansion chamber 1P, the pressure of the refrigerant in the primary 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 151 of the step channel section 15 below the inner hole 1111 is also set to a flat structure. In this way, when the refrigerant flows out from the primary expansion chamber 1P, is rectified by the inner hole 1111, and then flows into each step channel section 15 in turn, expansion pressure occurs in each large-diameter channel section 151 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 fixing seat 13, and then the first fixing seat 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 fixed seat 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 fixed seat 13 is in contact with the flange portion 111, and the cavity wall of the primary 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 portion of the flange top wall surface 1112 of the flange portion 111. 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 such setting, the inner diameter D2 of the primary expansion chamber 1P is actually the inner diameter of the seat base 132, that is, the inner diameter D2 of the primary 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 primary expansion chamber 1P and also convenient for the assembly of the first fixed seat 13 and the valve seat 11.

[0084] In other implementation schemes, the circumferential wall of the primary expansion chamber 1P can also be formed by part of the circumferential wall of the upper chamber 112 of the valve seat 11, and the seat base 132 of the first fixed seat 13 can be set with the same thickness as the first extension wall portion 133, that is, the first fixed seat 13 is an annular plate structure of equal thickness, and there is an axial gap between the first fixed seat 13 and the flange portion 111, and the axial gap is the axial height H1 of the primary expansion chamber 1P. At this time, at least part of the lower wall surface of the first fixed seat 13, part of the circumferential cavity wall of the valve seat 11 and the flange top wall surface 1112 of the flange portion 111 can enclose to form the primary expansion chamber 1P.

[0085] In this embodiment, the first fixed seat 13 further includes a second extension wall portion 134 extending radially outward from the seat base 132. The upper chamber 112 of the valve seat 11 includes a first chamber 1121 and a second chamber 1122, wherein the first chamber 1121 is located above the second chamber 1122, and the inner diameter of the first chamber 1121 is greater than the inner diameter of the second chamber 1122.

[0086] The lower wall surface of the second extension wall portion 134 of the first fixing seat 13 abuts against the first cavity bottom wall 11211 of the first cavity 1121, and the outer peripheral wall of the second extension wall portion 134 is tightly matched with the first cavity peripheral wall 11212 of the first cavity 1121. The outer peripheral wall of the seat base 132 of the first fixing seat 13 is tightly matched with the second cavity peripheral wall 11222 of the second cavity 1122.

[0087] In this way, the relative position between the first fixed seat 13 and the valve seat 11 can be limited by the tight fit between the seat base 132 and the second chamber 1122, which is beneficial to ensure the coaxiality of the valve mouth portion 131 formed on the first fixed seat 13 and the axial center line of the inner cavity of the valve seat 11, thereby ensuring the reliability of the fit between the valve needle component 40 and the valve mouth portion 131. At the same time, combined with the tight fit between the second extension wall portion 134 and the first chamber 1121, the reliability of the connection between the first fixed seat 13 and the valve seat 11 can be guaranteed.

[0088] In practical applications, after the first fixed seat 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 fixed seat 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 fixed seat 13 relative to the valve seat 11 after long-term use.

[0089] In one implementation, the lower chamber 113 of the valve seat 11 includes a third chamber 1131, the third chamber top wall of the third chamber 1131 is the flange bottom wall 1113 of the flange portion 111, at least part of the second fixed seat 14 is located in the third chamber 1131, and the second fixed seat 14 is tightly matched with the third chamber 1131.

[0090] In application, at least part of the flange bottom wall 1113 of the flange portion 111 and part of the wall surface of the second fixed seat 14 are combined to form an intermediate expansion cavity 2P, or, the flange bottom wall 1113 of the flange portion 111, at least part of the cavity circumferential wall of the third chamber 1131 and part of the wall surface of the second fixed seat 14 are combined to form an intermediate expansion cavity 2P.

[0091] The second fixing seat 14 also has a rectifying hole section 142 connected to the intermediate expansion cavity 2P. The intermediate expansion cavity 2P and the rectifying hole section 142 can form a stepped channel section 15. It can be understood that, in this way, the intermediate expansion cavity 2P is a large-diameter channel section 151 of a stepped channel section 15, and the rectifying hole section 142 is a small-diameter channel section 152 of a stepped channel section 15. Figure 2 and Figure 3 understand.

[0092] In this embodiment, the upper end surface of the second fixed seat 14 abuts against the flange bottom wall surface 1113 of the flange portion 111, and a groove portion 141 is provided at the upper end of the second fixed seat 14. The inner groove wall of the groove portion 141 and a part of the flange bottom wall surface 1113 of the flange portion 111 enclose a mid-level expansion cavity 2P.

[0093] In this way, the upper end surface of the second fixed seat 14 is the top surface of the groove wall portion forming the groove portion 141. There is no need to set up an additional structure to limit the relative position of the second fixed seat 14 and the valve seat 11. It can also ensure that a large-diameter channel section 151 is formed between the second fixed seat 14 and the flange portion 111, so that the structures of the second fixed seat 14 and the valve seat 11 can be relatively simple and easy to process.

[0094] In other embodiments, the second fixed seat 14 may not be provided with a groove portion at the upper end, but only with a through-flow rectifying hole section 142. After the second fixed seat 14 is fixedly installed in the third chamber 1131, an axial gap is provided between the upper end surface of the second fixed seat 14 and the flange bottom wall surface 1113 of the flange portion 111. In this way, the upper end surface of the second fixed seat 14, the flange bottom wall surface 1113 of the flange portion 111 and part of the circumferential wall of the third chamber 1131 can form an intermediate expansion cavity 2P, and the intermediate expansion cavity 2P can form a step channel section with the rectifying hole section 142 of the second fixed seat 14.

[0095] In the illustrated example, the second fixed seat 14 has a groove portion 141 and a rectifying hole section 142 connected to the groove portion 141 , so that after the second fixed seat 14 is assembled with the valve seat 11 , a stepped channel section is formed between the second fixed seat 14 and the lower chamber 113 of the valve seat 11 .

[0096] In other embodiments, more than two stepped channel sections may be formed between the second fixing seat 14 and the lower chamber 113 .

[0097] Taking two step channel sections as an example, the second fixed seat 14 can be an integrated structure, having a large diameter groove section, a first small diameter hole, a first large diameter hole, and a second small diameter hole arranged in sequence along the axial direction. In this way, after the second fixed seat 14 is assembled with the lower chamber 113, the large diameter groove section and the flange portion 111 form a large diameter channel section, which constitutes a step channel section with the adjacent first small diameter hole, and the first large diameter hole and the second small diameter hole of the second fixed seat 14 constitute a step channel section. The second fixed seat 14 can also be a split structure, and the second fixed seat 14 includes two sub-seats, each of which has a groove portion with a larger inner diameter and a rectifying hole section with a smaller inner diameter. The two sub-seats are tightly matched with the lower chamber 113, and the two sub-seats are axially abutted against each other, and the sub-seat located above is abutted against the flange portion 111, so that an intermediate expansion cavity 2P is formed between the upper sub-seat and the flange portion 111, and the intermediate expansion cavity 2P and the rectifying hole section of the upper sub-seat constitute a step channel section, and an intermediate expansion cavity 2P is formed between the lower sub-seat and the upper sub-seat, and the intermediate expansion cavity 2P and the rectifying hole section of the lower sub-seat constitute a step channel section.

[0098] In this embodiment, the lower chamber 113 of the valve seat 11 also includes a fourth chamber 1132 located below the third chamber 1131, and the inner diameter of the fourth chamber 1132 is larger than the inner diameter of the third chamber 1131; the lower end of the second fixed seat 14 has a stop protrusion 143 extending radially outward, and the stop protrusion 143, the protrusion top wall surface 1431 of the stop protrusion 143 abuts against the fourth chamber top wall 11321 of the fourth chamber 1132, and the protrusion outer peripheral wall 1432 of the stop protrusion 143 is tightly matched with the fourth chamber peripheral wall 11322 of the fourth chamber 1132.

[0099] After the above arrangement, it is convenient to limit the position of the second fixing seat 14 in the axial direction, and the second fixing seat 14 and the valve seat 11 also have a good fixing effect.

[0100] In application, after the second fixing seat 14 and the valve seat 11 are tightly matched, they can also be fixed by welding to further improve the fixing effect of the two.

[0101] In this embodiment, the upper end of the outlet pipe 30 is inserted into the fourth chamber 1132 of the valve seat 11, the outlet pipe 30 is tightly matched with the fourth chamber 1132, and the upper pipe end wall of the outlet pipe 30 abuts against the lower end surface of the second fixing seat 14. In this way, the positioning effect of the second fixing seat 14 can be further improved.

[0102] In one implementation, at least part of the structure of the second fixing seat 14 can be made of a filter material, and the filter material itself has pores, and the filter material can be considered to be a porous structure. 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.

[0103] The second fixing seat 14 can be made entirely of filter material, or only a portion of the structural material can be made of filter material.

[0104] In one implementation, in each step channel section 15 of the valve device, the axial height of the small diameter channel section 152 is greater than the axial height of the large diameter channel section 151. This arrangement can rectify the refrigerant flowing out of the large diameter channel section 151 to reduce eddy currents, which is conducive to further reducing noise.

[0105] In a specific implementation, the axial height of the small-diameter channel section 152 directly connected to the outlet pipe 30 can be set larger than the axial heights of other small-diameter channel sections 152 , so that the refrigerant has a better rectification effect before flowing into the outlet pipe 30 .

[0106] In one implementation, the axial center lines of the valve opening 131, the inner hole 1111 of the flange 111, and each small-diameter channel section 152 coincide, and the inner diameter D4 of the inner hole 1111 and each small-diameter channel section 152 is not less than the inner diameter D2 of the valve opening 131. In this way, the setting of the inner hole 1111 and the small-diameter channel section 152 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 inner hole 1111 and the small-diameter channel section 152 will not interfere with the valve needle 41, and can be combined with Figure 1 understand.

[0107] 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 comprises a valve body component, the valve body component comprises a valve seat, a first fixed seat and a second fixed seat, the first fixed seat and the second fixed seat are both fixedly connected to the valve seat; The valve seat has an inner cavity, and the valve seat includes a flange portion, and the flange portion extends radially inward from the circumferential cavity wall of the inner cavity; The first fixing seat is located above the flange portion, the first fixing seat has a valve opening portion communicating with the inner cavity, a primary expansion cavity is formed between the first fixing seat and the flange portion, the primary expansion cavity communicates with the valve opening portion and the inner hole of the flange portion, and the inner diameter of the primary expansion cavity is greater than the aperture of the inner hole; The inner cavity includes a lower chamber located below the flange portion, the second fixing seat is located below the flange portion and is tightly matched with the lower chamber, at least one stepped channel section is formed between the second fixing seat and the lower chamber, 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 a portion of the flange bottom wall surface of the flange portion constitutes a partial 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 primary expansion cavity is H1, the inner diameter of the primary 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 fixing seat comprises 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 primary expansion cavity includes an inner peripheral wall of the seat base, a lower wall surface of the first extension 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 inner cavity includes an upper cavity located above the flange portion, the upper cavity includes a first cavity and a second cavity, the first cavity is located above the second cavity, and the inner diameter of the first cavity is greater than the inner diameter of the second cavity; The first fixing seat comprises a second extending wall portion extending radially outward from the seat base, the lower wall surface of the second extending wall portion abuts against the first cavity bottom wall of the first cavity, and the outer peripheral wall of the second extending wall portion is tightly matched with the first cavity peripheral wall of the first cavity; The outer peripheral wall of the seat base is tightly matched with the second peripheral wall of the second cavity.

4. The valve device according to claim 1, characterized in that The lower chamber includes a third chamber, the top wall of the third chamber is the flange bottom wall of the flange portion, at least part of the second fixing seat is located in the third chamber, and the second fixing seat is tightly matched with the third chamber.

5. The valve device according to claim 4, characterized in that At least part of the flange bottom wall of the flange portion and part of the wall of the second fixing seat enclose a middle-stage expansion cavity, or the flange bottom wall of the flange portion, at least part of the cavity peripheral wall of the third cavity and part of the wall of the second fixing seat enclose a middle-stage expansion cavity; The second fixing seat has a rectifying hole section connected to the intermediate expansion cavity, and the intermediate expansion cavity and the rectifying hole section constitute a stepped channel section.

6. The valve device according to claim 5, characterized in that The upper end surface of the second fixing seat abuts against the flange bottom wall surface of the flange part, and the upper end of the second fixing seat has a groove part, and the inner groove wall of the groove part and the part of the flange bottom wall surface of the flange part enclose the intermediate expansion cavity.

7. The valve device according to claim 4, characterized in that The lower chamber comprises a fourth chamber located below the third chamber, and the inner diameter of the fourth chamber is greater than the inner diameter of the third chamber; The lower end of the second fixing seat has a stop convex portion extending radially outward, and the convex portion top wall surface of the stop convex portion abuts against the fourth cavity top wall of the fourth cavity.

8. The valve device according to claim 7, characterized in that The valve device also includes an outlet pipe, the upper end of which is inserted into the fourth chamber, the outlet pipe is tightly matched with the fourth chamber, and the upper pipe end wall of the outlet pipe abuts against the lower end surface of the second fixing seat.

9. The valve device according to any one of claims 1 to 8, characterized in that: At least a portion of the second fixing seat is made of filter material.

10. The valve device according to any one of claims 1 to 8, 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 diameter 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; And / or, in the same step channel section, the axial height of the small-diameter channel section is greater than the axial height of the large-diameter channel section.

11. The valve device according to any one of claims 1 to 8, characterized in that: The valve device is used in a refrigeration system.

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