Valve device

Abstract

The valve device comprises a valve body assembly, the valve body assembly comprises a valve seat and a diffusion seat, the valve seat is fixedly connected with the diffusion seat, the valve seat is provided with a valve cavity, and the valve seat comprises a body part and an extending wall part extending inwards in the radial direction from the body part; the valve body assembly is provided with a step channel section capable of being communicated with the valve cavity, the step channel section comprises a small-diameter cavity section and a large-diameter cavity section which are communicated, and at least part of the upper wall face of the diffusion seat forms part of the cavity wall of the large-diameter cavity section. At least part of the lower wall surface of the extension wall part also forms part of the cavity wall of the large-diameter cavity section, and the inner wall surface of the extension wall part forms the cavity wall of the small-diameter cavity section; wherein the thickness M of the extending wall part is less than or equal to 1mm; the height H1 of the large-diameter cavity section and the diameter D1 of the large-diameter cavity section meet the following relation: # imgabs0 #; and the bubble noise in the valve device is relatively low.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration control, and particularly to a valve device. Background Art

[0002] Valve devices, such as electronic expansion valves, are commonly found in air-conditioning systems and are used to achieve the on-off of the refrigerant flow path.

[0003] In the related art, the valve device includes a valve body. A valve cavity is formed inside the valve body. The valve body also includes a valve port part, and a valve port passage is formed in the valve port part. The valve port passage is communicated with the valve cavity. When the refrigerant fluid flows from the valve cavity into the valve port passage, the flow area changes drastically, resulting in a huge pressure drop of the refrigerant fluid. When the pressure of the refrigerant fluid is lower than the saturation pressure, bubbles are likely to be generated inside the refrigerant fluid, and these bubbles can grow continuously in the valve port passage. When the pressure of the refrigerant fluid gradually increases, the bubbles will break and collapse, thereby generating bubble noise. During the process of bubble collapse, the size and number of the bubbles are the main factors affecting the size of the bubble noise.

[0004] Therefore, how to provide a solution to overcome or alleviate the above-mentioned defects is still a technical problem that those skilled in the art urgently need to solve. Summary of the Invention

[0005] The object of the present invention is to provide a valve device with relatively small bubble noise inside.

[0006] To solve the above technical problems, the present invention provides a valve device, including a valve body assembly. The valve body assembly includes a valve seat and a diffuser seat. The valve seat is fixedly connected to the diffuser seat. The valve seat is provided with a valve cavity. The valve seat includes a main body part and an extending wall part extending radially inwards from the main body part. The valve body assembly has a stepped channel section that can be communicated with the valve cavity. The stepped channel section includes a small-diameter cavity section and a large-diameter cavity section that are communicated with each other. At least part of the upper wall surface of the diffuser seat constitutes part of the cavity wall of a large-diameter cavity section. At least part of the lower wall surface of the extending wall part also constitutes part of the cavity wall of a large-diameter cavity section. The inner wall surface of the extending wall part constitutes the cavity wall of a small-diameter cavity section. Wherein, the thickness M of the extending wall part ≤ 1 mm. The following relationship is satisfied between the height H1 of the large-diameter cavity section and the diameter D1 of the large-diameter cavity section:

[0007] With the above - mentioned solution, the height H1 of the large - diameter cavity section is much smaller than its diameter D1, making the large - diameter cavity section present a flat - shaped structure. When the refrigerant fluid flows from the small - diameter cavity section into the large - diameter cavity section, due to the sudden increase in the flow - through area, the pressure of the refrigerant fluid can quickly recover, and accompanied by a slight vortex, the pressure of the refrigerant fluid can be further increased. Thus, the development and growth process of possible bubbles can be effectively inhibited, enabling the bubbles to start collapsing when they are in a relatively small size and quantity, and further significantly reducing and lowering the bubble noise.

[0008] During the actual operation process, bubbles are initially generated close to the inner wall surface of the extending wall portion and will develop and grow within the small - diameter cavity section formed by enclosing the inner wall surface of the extending wall portion. Based on this, in the embodiments of the present invention, the thickness M of the extending wall portion can also be set to be less than or equal to 1 mm. In this way, the axial dimension of the small - diameter cavity section formed by the inner wall surface of the extending wall portion is very small, which can effectively inhibit the initial generation and development of bubbles and has a positive effect on reducing bubble noise.

[0009] Therefore, the valve device provided by the embodiments of the present invention can preferably reduce bubble noise.

[0010] Optionally, the valve seat is provided with a communication hole, the communication hole includes a first hole section and a second hole section, the diameter of the second hole section is larger than that of the first hole section, the second hole section is communicated with the valve cavity through the first hole section, and the inner wall surface of the extending wall portion encloses to form the first hole section; the valve body assembly further includes a diffuser seat, at least part of the diffuser seat is located within the second hole section, and the part of the wall surface formed by the second hole section and the diffuser seat encloses to form a primary diffuser cavity section. The aperture of the primary diffuser cavity section is larger than that of the first hole section, and the first hole section and the primary diffuser cavity section are combined to form one of the stepped channel sections.

[0011] Optionally, a first step surface is formed between the first hole section and the second hole section. The diffuser seat has an axial end face facing the first step surface, and the axial end face is in abutting fit with the first step surface. A primary sink is provided at the end of the diffuser seat facing the first step surface, and the primary sink and the first step surface enclose to form the primary diffuser cavity section.

[0012] Optionally, the diffuser seat is of an integral structure. The diffuser seat is further provided with a rectifying hole section, the rectifying hole section is communicated with the primary diffuser cavity section, and the following relationships are satisfied between the diameter D3 of the rectifying hole section and the diameter D2 of the small - diameter cavity section: D3≥D2, and the following relationship is satisfied between the height H3 of the rectifying hole section and the height H1 of the large - diameter cavity section: H3>H1.

[0013] Optionally, the diffuser seat includes a plurality of sub-seats arranged in sequence axially. In each sub-seat, the sub-seat closest to the valve cavity and a part of the wall surface for forming the second hole section enclose to form the first-stage diffuser cavity section; two adjacent sub-seats enclose to form a second-stage diffuser cavity section, or two adjacent sub-seats and a part of the wall surface for forming the second hole section enclose to form a second-stage diffuser cavity section; each sub-seat is provided with a rectifying hole section, and the rectifying hole section and the adjacent second-stage diffuser cavity section downstream are combined to form the stepped channel section.

[0014] Optionally, two adjacent sub-seats abut against each other axially. Among two adjacent sub-seats, the one located downstream is provided with a second-stage sunk groove, and the second-stage sunk groove and the upstream sub-seat enclose to form the second-stage diffuser cavity section.

[0015] Optionally, the following relationship is satisfied between the diameter D1 of the large-diameter cavity section and the diameter D2 of the small-diameter cavity section:

[0016] Optionally, at least a part of the diffuser seat is prepared from a filter material.

[0017] Optionally, the communication hole further includes a third hole section, the third hole section is connected to the second hole section, the diameter of the third hole section is larger than that of the second hole section, and a second stepped surface is formed between the third hole section and the second hole section; the outer peripheral wall of the diffuser seat has a wing portion extending radially outward, and the wing portion is in abutting fit with the second stepped surface.

[0018] Optionally, it further includes an outlet nozzle, the outlet nozzle has a fitting portion, the fitting portion is inserted into the third hole section and abuts against the diffuser seat axially. Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of a specific embodiment of the valve device provided by the present invention;

[0020] Figure 2 is Figure 1 a partial enlarged view of area A in

[0021] Figure 3 is a partial structural diagram of the valve seat;

[0022] Figure 4 is a schematic structural diagram of the diffuser seat;

[0023] Figure 5 is Figure 2 a schematic structural diagram of an alternative solution of

[0024] Figure 6 is Figure 2 a schematic structural diagram of another alternative solution of

[0025] The descriptions of the reference numerals are as follows:

[0026] 1 valve body assembly, 11 valve seat, 11a body part, 11b extending wall part, 111 valve cavity, 112 communication hole, 112a first hole section, 112b second hole section, 112c third hole section, 112d first step surface, 112e second step surface, 12 valve body, 13 diffuser seat, 131 axial end face, 131a first-stage sinking groove, 132 rectifying hole section, 133 sub-seat, 133a second-stage sinking groove, 134 wing part;

[0027] 2 outlet connecting pipe, 21 mating part;

[0028] 3 inlet connecting pipe;

[0029] 4 valve needle assembly, 41 valve needle, 42 sleeve part, 43 spring, 44 support component, 45 fixing part, 46 sleeve cover, 47 lead screw;

[0030] 5 guiding part;

[0031] 6 nut assembly, 61 nut, 62 connecting piece;

[0032] 7 magnetic rotor assembly, 71 connecting plate, 72 magnetic rotor;

[0033] 8 valve cover;

[0034] P first-stage diffuser cavity section, Q second-stage diffuser cavity section. Detailed implementation manners

[0035] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] In the embodiments of the present invention, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", and "third" may explicitly or implicitly include one or more of such features.

[0037] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, "connected" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0038] In the embodiments of the present invention, the orientation terms mentioned, such as "inner", "outer", etc., are only with reference to the direction of the attached drawings. Therefore, the orientation terms used are for better and clearer description and understanding of the embodiments of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Thus, it should not be construed as a limitation to the embodiments of the present invention. In addition, unless otherwise specified in this application, the "plurality" mentioned in this application means two or more.

[0039] In the description of the embodiments of the present invention, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising that element.

[0040] Please refer to Figures 1-6 , Figure 1 which is a schematic structural diagram of a specific embodiment of the valve device provided by the present invention, Figure 2 is Figure 1 a partial enlarged view of area A in Figure 3 is a partial structural diagram of the valve seat, Figure 4 is a schematic structural diagram of the diffuser seat, Figure 5 is Figure 2 a schematic structural diagram of an alternative solution of Figure 6 is Figure 2 a schematic structural diagram of another alternative solution of

[0041] As Figure 1 shown, the present invention provides a valve device, which can specifically be an electronic expansion valve, etc., including a valve body assembly 1, an outlet connection pipe 2, an inlet connection pipe 3, a valve needle assembly 4, a guiding part 5, a nut assembly 6, a magnetic rotor assembly 7, and a valve cover 8.

[0042] The valve body assembly 1 is the structural basis of the valve device, including a valve seat 11 and a valve body 12. The valve body 12 is located above the valve seat 11 and is fixedly connected to the valve seat 11. The specific fixed connection method can be welding, etc. Combining Figure 2 , a valve cavity 111 can be formed in the valve seat 11. And the valve body assembly 1 is also configured with a valve port channel.

[0043] The outlet connection pipe 2 and the inlet connection pipe 3 can both be fixedly connected to the valve seat 11. The specific fixed connection method can be welding or the like. In actual use, the refrigerant fluid can flow into the valve cavity 111 from the inlet connection pipe 3, and then, the refrigerant fluid in the valve cavity 111 can flow out through the valve port channel and the outlet connection pipe 2.

[0044] The valve cover 8 can be located above the valve body 12 and can be fixedly connected to the valve body 12 by means such as welding. In this way, the valve cover 8, the valve body 12, and the valve seat 11 can be fixedly connected. The space enclosed by the three can contain the aforementioned valve needle assembly 4, the guiding part 5, the nut assembly 6, and the magnetic rotor assembly 7.

[0045] The valve needle assembly 4 includes a valve needle 41, a sleeve part 42, a spring 43, a support member 44, a fixing member 45, a sleeve cover 46, and a lead screw 47.

[0046] A floating connection can be achieved between the lead screw 47 and the valve needle 41 through a sleeve (not marked in the figure). The sleeve includes the sleeve part 42 and the sleeve cover 46; the sleeve part 42 is generally in the shape of a cup with an open bottom, and there is an opening at its bottom through which the valve needle 41 can pass, so that at least part of it is located in the valve cavity 111. When the valve device is working, the valve needle 41 can be driven to move relative to the valve port channel, thereby realizing the on-off and opening degree adjustment of the refrigerant fluid. In this way, during the working process of the valve device, the valve needle 41 can axially move relative to the sleeve part 42 within a certain stroke. When the valve needle 41 abuts against the upper edge of the valve port channel, the valve needle 41 can move relative to the sleeve part 42 within a certain range against the spring force, but will not break away from the sleeve. The sleeve cover 46 is fixedly or limitedly arranged at the top of the sleeve part 42. The sleeve cover 46 is provided with an abutting part. The lower end of the lead screw 47 is fixedly connected with a fixing member 45. The fixing member 45 is provided with a wing plate. On the side of the wing plate facing the valve needle 41, a spring 43 is also provided and supported by a support member 44. One end of the spring 43 abuts against the side of the wing plate facing the valve needle 41, and the other end of the spring 43 abuts against the support member 44.

[0047] During assembly, the lead screw 47 can be first passed through the sleeve cover 46. After the fixing member 45 is fixedly connected to the lead screw 47, it is assembled with the sleeve part 42, and the sleeve cover 46 is assembled with the sleeve part 42. In this way, the abutting part of the sleeve cover 46 and the wing plate of the fixing member 45 are arranged oppositely to form a limiting structure, and at the same time, a floating connection structure similar to suspension is formed between the sleeve and the lead screw 47.

[0048] The outer side of the guiding part 5 is matched with the valve seat 11 by using a stepped structure. The inner part of the guiding part 5 is respectively matched with the sleeve part 42 and the valve needle 41, providing good guidance and radial support for the sleeve part 42 and the valve needle 41, and preventing abnormal swinging of the sleeve part 42 and the valve needle 41.

[0049] The nut assembly 6 includes a nut 61 and a connecting piece 62. The nut 61 is fixedly connected to the connecting piece 62. The connecting piece 62 can be specifically formed by stamping a metal plate. The nut 61 is fixedly arranged with the valve cover 8 and / or the valve body 12 through the metal connecting piece 62. The nut 61 can be made of non-metallic material by injection molding with the connecting piece 62 as an insert, and the connecting piece 62 and the valve body 12 can be fixedly connected by welding. It should be understood that when the valve body 12 is not provided, the connecting piece 62 can be fixedly connected with the valve seat 11 or the valve cover 8 by welding.

[0050] The magnetic rotor assembly 7 can rotate by induction of the electromagnetic force of the electromagnetic coil. The magnetic rotor assembly 7 includes a magnetic rotor 72 and a connecting plate 71. The connecting plate 71 and the magnetic rotor 72 can be fixedly connected or integrally arranged. The connecting plate 71 is fixedly connected to the screw rod 47. In this way, the screw rod 47 is connected to the magnetic rotor assembly 7 through the connecting plate 71 to form a whole. Specifically, the screw rod 47 and the connecting plate 71 can be fixedly connected by welding, or connected by other fixed connection or limit connection methods such as clamping and crimping.

[0051] In the embodiment of the present invention, the valve seat 11 further comprises a body portion 11a and an extension wall portion 11b extending radially inward from the body portion 11a, and the inner wall surface of the extension wall portion 11b can enclose a portion of the valve port channel. The valve port channel comprises a stepped channel section, and the stepped channel section comprises a small diameter cavity section and a large diameter cavity section connected to each other. In the direction away from the valve cavity 111, the small diameter cavity section and the large diameter cavity section are arranged in sequence, referring to Figure 1 and Figure 2 The orientation and position relationship in the cavity is that the large diameter cavity section is located below the small diameter cavity section.

[0052] The height H1 of the large diameter cavity section and the diameter D1 of the large diameter cavity section satisfy the following relationship: In this way, the height H1 of the large-diameter cavity section is much smaller than its diameter D1, so that the large-diameter cavity section presents a flat structure. When the refrigerant fluid flows from the small-diameter cavity section into the large-diameter cavity section, the pressure of the refrigerant fluid can rise rapidly due to the sudden increase in the flow area, and accompanied by the appearance of slight vortices, the pressure of the refrigerant fluid can be raised again, thereby effectively suppressing the development and growth of possible bubbles, so that the bubbles begin to collapse when they are smaller in size and number, thereby greatly reducing and lowering the bubble noise, and achieving the technical purpose of noise reduction.

[0053] The diameter D1 of the large diameter cavity section and the diameter D2 of the small diameter cavity section can satisfy the following relationship: In this way, the diameter D1 of the large-diameter cavity section is much larger than the diameter D2 of the small-diameter cavity section, which can increase the pressure change of the refrigerant fluid in the process of flowing from the small-diameter cavity section to the large-diameter cavity section.

[0054] The valve body assembly 1 may further include a diffuser seat 13. The valve port passage may be jointly formed by the valve seat 11 and the diffuser seat 13, so that the formation of the valve port passage with a complex structure can be facilitated.

[0055] As Figure 3 shown, the valve seat 11 may be provided with a communication hole 112. The communication hole 112 may include a first hole section 112a and a second hole section 112b. The first hole section 112a may specifically be formed by enclosing the inner wall surface of the extending wall portion 11b. The diameter of the second hole section 112b may be larger than that of the first hole section 112a. The second hole section 112b may communicate with the valve cavity 111 through the first hole section 112a. In some embodiments, the first hole section 112a is also referred to as the valve port hole, which is mainly used to cooperate with the aforementioned valve needle 41 to achieve the on-off adjustment and opening degree adjustment of the refrigerant fluid.

[0056] At least a part of the diffuser seat 13 may be located in the second hole section 112b. The partial wall surface for forming the second hole section 112b and the diffuser seat 13 may enclose to form a primary diffuser cavity section P. The aperture of the primary diffuser cavity section P is larger than that of the first hole section 112a. Moreover, the first hole section 112a and the primary diffuser cavity section P may be combined to form a stepped channel section. The first hole section 112a is the small-diameter cavity section of the stepped channel section, and the primary diffuser cavity section P is the large-diameter cavity section of the stepped channel section. In this way, both the first hole section 112a and the primary diffuser cavity section P constitute a part of the valve port passage.

[0057] During the actual operation process, bubbles are initially generated close to the upper end of the first hole section 112a and will grow and develop in the first hole section 112a. Based on this, in the embodiment of the present invention, the height H2 of the first hole section 112a (that is, the thickness M of the extending wall portion 11b) may also be set to be less than or equal to 1 mm. In this way, the axial dimension of the first hole section 112a can be very small, which can effectively inhibit the initial generation and development of bubbles and has a positive effect on reducing bubble noise.

[0058] In an achievable solution, as Figure 4 shown, and in combination with Figure 2, a first stepped surface 112d may be formed between the first hole section 112a and the second hole section 112b, and the first stepped surface 112d is the lower wall surface of the extending wall portion 11b; the diffuser base 13 has an axial end face 131 facing the first stepped surface 112d, and the axial end face 131 may be in abutting cooperation with the first stepped surface 112d. Moreover, a first-stage sinking groove 131a may be provided at the end of the diffuser base 13 facing the first stepped surface 112d. The first-stage sinking groove 131a includes a groove bottom wall and a groove side wall. Both the groove bottom wall and the axial end face 131 may be referred to as the upper wall surface of the diffuser base 13. The groove bottom wall, the groove side wall, and a part of the first stepped surface 112d may enclose to form a first-stage diffusing cavity section P, that is, the cavity wall of the first-stage diffusing cavity section P is equivalent to being composed of a part of the upper wall surface of the diffuser base 13, a part of the lower wall surface of the extending wall portion 11b, and the groove side wall.

[0059] In the above solution, the diffuser base 13 may be axially abutted against the first stepped surface 112d, and both the installation stability and the installation reliability of the diffuser base 13 are relatively high.

[0060] In another feasible solution, the axial end face 131 of the diffuser base 13 and the first stepped surface 112d may also be in clearance fit. In this solution, the aforementioned first-stage sinking groove 131a does not need to be provided on the axial end face 131. The structural form of the diffuser base 13 may be relatively simple, and the axial dimension of the diffuser base 13 may be relatively small, with less material consumption, relatively low cost, and relatively light weight. The first-stage diffusing cavity section P may be formed by enclosing the axial end face 131, a part of the peripheral wall surface of the second hole section 112b, and the first stepped surface 112d. The peripheral wall surface of the second hole section 112b is equivalent to a part of the inner wall surface of the main body portion 11a. Therefore, the cavity wall of the first-stage diffusing cavity section P is equivalent to being composed of the upper wall surface of the diffuser base 13, the lower wall surface of the extending wall portion 11b, and a part of the inner wall surface of the main body portion 11a.

[0061] In Figures 1-4 's implementation manner, the diffuser base 13 may be an integral structure, and the diffuser base 13 may also be provided with a rectifying hole section 132, which may be communicated with the first-stage diffusing cavity section P for rectifying the refrigerant fluid flowing out of the first-stage diffusing cavity section P to reduce eddy currents, thereby further reducing the liquid flow noise. The following relationship may be satisfied between the diameter D3 of the rectifying hole section 132 and the diameter D2 of the small-diameter cavity section: D3≥D2. In this way, the setting of the rectifying hole section 132 does not affect the throttling function of the small-diameter cavity section. The following relationship may be satisfied between the height H3 of the rectifying hole section 132 and the height H1 of the large-diameter cavity section: H3>H1 to ensure the axial dimension of the rectifying hole section 132, so as to give full play to the rectifying function of the rectifying hole section 132 as much as possible.

[0062] The outer wall surface of the integrated diffuser seat 13 may also be provided with wings 134. The communication hole 112 may further include a third hole section 112c, and the diameter of the third hole section 112c may be larger than that of the second hole section 112b. In this way, a second stepped surface 112e may be formed between the third hole section 112c and the second hole section 112b. During assembly, the wing 134 may be axially abutted against the second stepped surface 112e to determine the axial installation position of the diffuser seat 13.

[0063] As Figure 5 and Figure 6 shown, the diffuser seat 13 may also be of a split structure, and the diffuser seat 13 may include a plurality of sub-seats 133 arranged in sequence axially.

[0064] Among the sub-seats 133, the sub-seat 133 closest to the valve cavity 111, that is Figure 5 and Figure 6 the uppermost sub-seat 133 in and the partial wall surface for forming the second hole section 112b may enclose to form a first-stage diffuser cavity section P. The formation method of the first-stage diffuser cavity section P may refer to the aforementioned one feasible solution and another feasible solution.

[0065] There may be a second-stage diffuser cavity section Q between adjacent sub-seats 133, and the formation method of the second-stage diffuser cavity section Q may also refer to the aforementioned one feasible solution and another feasible solution. When adopting one feasible solution, among adjacent sub-seats 133, the top end surface of the one located downstream may be provided with a second-stage sinking groove 133a; adjacent sub-seats 133 may be axially abutted against each other to improve the reliability and stability of the axial positioning and assembly of each sub-seat 133; the second-stage diffuser cavity section Q may specifically be formed by enclosing the bottom end surface of the upstream sub-seat 133 and the second-stage sinking groove 133a of the downstream adjacent sub-seat 133, that is, formed by enclosing two adjacent sub-seats 133. When adopting another feasible solution, adjacent sub-seats 133 may be arranged with an axial gap, and the one located downstream among adjacent sub-seats 133 does not need to be provided with a second-stage sinking groove 133a. The second-stage diffuser cavity section Q may specifically be formed by enclosing the bottom end surface of the upstream sub-seat 133, the top end surface of the downstream adjacent sub-seat 133, and a part of the peripheral wall surface of the second hole section 112b.

[0066] Each sub-seat 133 may be provided with a rectifying hole section 132, and moreover, each rectifying hole section 132 and the adjacent second-stage diffuser cavity section Q downstream may be combined to form a stepped channel section. In this way, there may be two or more stepped channel sections in the valve port channel, and multiple diffusions are realized in the valve port channel, which can better control the bubble noise.

[0067] When the diffuser base 13 is of a split structure, the outer peripheral wall of the lowermost split base 133 may be provided with the aforementioned wing portion 134, and the wing portion 134 is in abutting cooperation with the second stepped surface 112e to achieve axial positioning and assembly of the lowermost split base 133.

[0068] Combined with Figure 1 , Figure 2 , Figure 4 and Figure 5 , the outlet connection pipe 2 may have a mating portion 21, the mating portion 21 may be inserted into the third hole section 112c, and may be fixedly connected to the valve seat 11 by means of welding or the like. After installation, the outlet connection pipe 2 may abut against the diffuser base 13 axially to achieve installation and fixation of the diffuser base 13 inside the communication hole 112. That is to say, the diffuser base 13 can be installed and fixed by relying on the axial abutment of the outlet connection pipe 2. In this way, there is no need for any form of connection between the diffuser base 13 and the valve seat 11, and the structural form is simpler. And when it is necessary to replace the diffuser base 13, only the outlet connection pipe 2 needs to be disassembled, and then the diffuser base 13 can be taken out, which also facilitates maintenance and replacement.

[0069] It should be understood that in practical applications, the diffuser base 13 may also be connected to the valve seat 11 by means of bonding, screw connection, interference fit, etc., and this is also feasible.

[0070] Whether it is the aforementioned integral diffuser base 13 or the split diffuser base 13, at least a part of the diffuser base 13 may be prepared from a filter material. The filter material may be, for example, a wound wire mesh, a plurality of spherical components embedded integrally, etc. The filter material itself has pores, which can enable the immersion of the refrigerant fluid, and the process of the refrigerant fluid immersing into the filter material can itself also achieve the refinement treatment of the bubbles, which is also beneficial to reducing the bubble noise.

[0071] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A valve device, characterized in that, It includes a valve body assembly (1), the valve body assembly (1) includes a valve seat (11) and a diffuser seat (13), the valve seat (11) is fixedly connected to the diffuser seat (13), the valve seat (11) is provided with a valve cavity (111), and the valve seat (11) includes a body portion (11a) and an extension wall portion (11b) extending radially inwards from the body portion (11a); The valve body assembly (1) has a stepped channel section capable of communicating with the valve cavity (111), the stepped channel section includes a small-diameter cavity section and a large-diameter cavity section that are connected and communicated, at least a part of the upper wall surface of the diffuser seat (13) constitutes a part of the cavity wall of a large-diameter cavity section, at least a part of the lower wall surface of the extension wall portion (11b) also constitutes a part of the cavity wall of a large-diameter cavity section, and the inner wall surface of the extension wall portion (11b) constitutes the cavity wall of a small-diameter cavity section; Wherein, the thickness M of the extension wall portion ≤ 1 mm; The height H1 of the large-diameter cavity section and the diameter D1 of the large-diameter cavity section satisfy the following relationship:

2. The valve device according to claim 1, wherein The valve seat (11) is provided with a communication hole (112), the communication hole (112) includes a first hole section (112a) and a second hole section (112b), the diameter of the second hole section (112b) is greater than that of the first hole section (112a), the second hole section (112b) communicates with the valve cavity (111) through the first hole section (112a), and the inner wall surface of the extension wall portion (11b) encloses to form the first hole section (112a); At least a part of the diffuser seat (13) is located in the second hole section (112b), and is used to form a part of the wall surface of the second hole section (112b). The diffuser seat (13) and the second hole section (112b) enclose to form a primary diffuser cavity section (P), the aperture of the primary diffuser cavity section (P) is greater than that of the first hole section (112a), and the first hole section (112a) and the primary diffuser cavity section (P) are combined to form a stepped channel section.

3. The valve device according to claim 2, characterized in that, A first step surface (112d) is formed between the first hole section (112a) and the second hole section (112b), the diffuser seat (13) has an axial end surface (131) facing the first step surface (112d), the axial end surface (131) and the first step surface (112d) are in abutting fit, and a primary sink (131a) is provided at the end of the diffuser seat (13) facing the first step surface (112d), and the primary sink (131a) and the first step surface (112d) enclose to form the primary diffuser cavity section (P).

4. The valve device according to claim 2 or 3, characterized in that, The diffuser seat (13) is of an integral structure, the diffuser seat (13) is further provided with a rectifying hole section (132), the rectifying hole section (132) communicates with the primary diffuser cavity section (P), and the following relationship is satisfied between the diameter D3 of the rectifying hole section (132) and the diameter D2 of the small-diameter cavity section: D3 ≥ D2, and the following relationship is satisfied between the height H3 of the rectifying hole section (132) and the height H1 of the large-diameter cavity section: H3 > H1.

5. The valve device according to claim 2 or 3, characterized in that, The diffuser seat (13) includes a plurality of sub - seats (133) arranged in sequence axially. In each of the sub - seats (133), the sub - seat (133) closest to the valve cavity (111) and a partial wall surface for forming the second hole section (112b) enclose to form the first - stage diffuser cavity section (P). Two adjacent sub - seats (133) enclose to form a second - stage diffuser cavity section (Q), or two adjacent sub - seats (133) and a partial wall surface for forming the second hole section (112b) enclose to form a second - stage diffuser cavity section (Q). Each of the sub - seats (133) is provided with a rectifying hole section (132), and the rectifying hole section (132) and the adjacent second - stage diffuser cavity section (Q) downstream are combined to form the stepped channel section.

6. The valve device according to claim 5, characterized in that, Two adjacent sub - seats (133) abut against each other axially. Among two adjacent sub - seats (133), the one located downstream is provided with a second - stage sink (133a), and the second - stage sink (133a) and the upstream sub - seat (133) enclose to form the second - stage diffuser cavity section (Q).

7. The valve device according to any one of claims 1 to 6, characterized in that, The following relationship is satisfied between the diameter D1 of the large-diameter cavity section and the diameter D2 of the small-diameter cavity section:

8. The valve device according to any one of claims 1 to 6, characterized in that, At least a part of the diffuser seat (13) is prepared by using a filter material.

9. The valve device according to any one of claims 2-6, characterized in that, The communication hole (112) further includes a third hole section (112c). The third hole section (112c) is connected to the second hole section (112b). The diameter of the third hole section (112c) is larger than that of the second hole section (112b), and a second step surface (112e) is formed between the third hole section (112c) and the second hole section (112b). The outer peripheral wall of the diffuser seat (13) has a wing portion (134) extending radially outward, and the wing portion (134) abuts and cooperates with the second step surface (112e).

10. The valve device according to claim 9, characterized in that, It further includes an outlet connection pipe (2). The outlet connection pipe (2) has a fitting portion (21). The fitting portion (21) is inserted into the third hole section (112c) and abuts against the diffuser seat (13) axially.

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