Sealing structure and electronic expansion valve

Abstract

The invention relates to the technical field of electronic expansion valves, in particular to a sealing structure and an electronic expansion valve. The sealing structure comprises a valve needle, a valve seat, a valve port structure, a first sealing ring and a sealing block; the valve port structure comprises an upper valve port and a lower valve port; the top of the upper valve port is connected with the valve seat; an upper valve port boss is arranged at the bottom of the upper valve port, and a lower valve port boss is arranged at the top of the lower valve port; an annular sealing groove is formed in the top surface of the lower valve port boss; the first sealing ring is arranged at the bottom of the sealing groove, and the sealing block is hermetically arranged at the top of the sealing groove; the top of the sealing block abuts against the upper valve port boss, and the bottom of the sealing block abuts against the first sealing ring. The bottom of the valve needle can abut against the top of the sealing block. A vent hole is formed in the lower valve port boss and penetrates from the inner wall of the sealing groove to the outer wall of the lower valve port. Therefore, the sealing performance of the valve seat and the valve port can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of electronic expansion valves, and in particular to a sealing structure and an electronic expansion valve. Background Art

[0002] The electronic expansion valve can respond quickly to dynamic changes in air-conditioning refrigerant under driving conditions and can be used in a variety of control strategies to improve the efficiency and performance of the overall air-conditioning system.

[0003] Since the traditional electronic expansion valve needs to overcome the force generated by the inlet and outlet pressure difference to open the valve from the closed state, and when the diameter increases (for example, 5 to 16 mm in diameter), the pressure difference force is too large, and the driving force generated by the motor cannot overcome it. Therefore, a special structure is needed to reduce the driving force required to open the valve. The specific movement process of the existing large-diameter electronic expansion valve solution is that the internal coil is energized to generate a magnetic field, the magnet rotates, and the magnet drives the connecting plate, the stop rod, and the slip ring to move together. The slip ring is installed on the spring guide rail, and the slip ring rotates on the spring guide rail. There are upper and lower limit parts on the spring guide rail to achieve the upper and lower limit of the slip ring. At the same time, the rotation of the magnet drives the connection plate and the screw rod to rotate, and the rotation of the screw rod is converted into the up and down movement of the screw rod through the threaded cooperation with the nut, thereby driving the valve needle to move up and down, and controlling the size of the flow area of ​​the valve port.

[0004] However, in the above solution, the sealing effect of the valve seat and the valve port is poor, thereby affecting the regulating and limiting flow effect of the electronic expansion valve. Summary of the invention

[0005] Objectives of the present invention include, for example, providing a sealing structure and an electronic expansion valve, which can improve the sealing performance between a valve seat and a valve port.

[0006] The embodiments of the present invention can be implemented as follows:

[0007] In a first aspect, the present invention provides a sealing structure, comprising:

[0008] Valve needle, valve seat, valve port structure, first sealing ring, sealing block;

[0009] The valve needle is movably disposed in a matching inner cavity at the bottom of the valve seat;

[0010] The valve port structure comprises an upper valve port and a lower valve port; the top of the upper valve port is connected to the valve seat;

[0011] The bottom of the upper valve port is provided with an upper valve port boss, and the top of the lower valve port is provided with a lower valve port boss; the top surface of the lower valve port boss is provided with an annular sealing groove; the first sealing ring is provided at the bottom of the sealing groove, and the sealing block is sealed at the top of the sealing groove; the top of the sealing block abuts against the upper valve port boss, and the bottom of the sealing block abuts against the first sealing ring; the bottom of the valve needle can abut against the top of the sealing block;

[0012] A vent hole is arranged on the lower valve port boss, and the vent hole penetrates from the inner wall of the sealing groove to the outer wall of the lower valve port.

[0013] In an optional embodiment, the lower valve port boss includes an inner convex ring and an outer convex ring arranged concentrically, the outer convex ring is flush with the outer wall of the lower valve port, and the inner convex ring is flush with the inner wall of the lower valve port; the inner convex ring and the outer convex ring enclose the sealing groove;

[0014] The upper valve port boss is arranged on the outer convex ring, the top of the sealing block abuts against the bottom of the upper valve port boss, and the sealing block is located above the inner convex ring; and the sealing block part can be tightly embedded in the sealing groove, and the first sealing ring provides elastic force so that the sealing block can maintain abutment against the upper valve port boss.

[0015] In an optional embodiment, the vent hole extends in a radial direction of the lower valve port.

[0016] In an optional embodiment, the first sealing ring is an O-ring.

[0017] In an optional embodiment, the bottom of the sealing block has an annular protrusion, and the protrusion is embedded in the opening of the sealing groove.

[0018] In an optional embodiment, a second sealing ring is further included; a ring platform is provided at the bottom of the valve seat; an annular connecting platform is provided at the top of the upper valve port, and the connecting platform forms an annular second step portion close to the outer wall of the upper valve port; the ring platform is sleeved on the second step portion; the top of the connecting platform and the bottom of the valve seat form an installation cavity; the second sealing ring is arranged in the installation cavity;

[0019] The connecting platform is provided with a groove, and the groove is communicated with the installation inner cavity.

[0020] In an optional embodiment, a sealing ring is also included;

[0021] The second sealing ring and the sealing ring are both arranged in the installation inner cavity; along the radial direction of the valve seat, the ring platform, the second sealing ring and the sealing ring are arranged in sequence.

[0022] In an optional embodiment, the sealing ring is sleeved on the outside of the valve needle, and the valve needle and the sealing ring are interference fit.

[0023] In an optional embodiment, along the axial centerline direction of the valve seat, the top of the groove penetrates to the top surface of the connecting platform;

[0024] Along the radial direction of the valve seat, the groove passes through the inner wall of the connecting platform close to the matching inner cavity.

[0025] In a second aspect, the present invention provides an electronic expansion valve, comprising the sealing structure described in any one of the aforementioned embodiments.

[0026] The beneficial effects of the embodiments of the present invention include, for example:

[0027] The sealing structure of this scheme includes a valve needle, a valve seat, and a valve port structure. The valve port structure includes a split upper valve port and a lower valve port. An upper valve port boss is provided at the bottom of the upper valve port, and a lower valve port boss is provided at the top of the lower valve port. The first sealing ring and the sealing block are clamped between the upper valve port boss and the lower valve port boss, so as to ensure the sealing of the entire valve port structure. Furthermore, the sealing block is pressed by the upper valve port boss and the lower valve port boss, and a first sealing ring is placed at the lower end of the sealing block to provide sealing and clamping force; at the same time, a vent is provided on the lower valve port to prevent the sealing block from being deformed toward the middle due to local high pressure in the cavity of the sealing block. The upper valve port is tightly connected to the valve seat to ensure the sealing effect of the valve seat and the valve port structure. In summary, such a sealing structure adopts a method of fixing the position of the sealing block to prevent the sealing block from being deformed or displaced during use, which may cause the product sealing failure, thereby ensuring the overall sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 is a cross-sectional schematic diagram of a sealing structure according to an embodiment of the present invention;

[0030] Figure 2 A partial cross-sectional schematic diagram of a sealing structure according to an embodiment of the present invention;

[0031] Figure 3 A schematic structural diagram of a lower valve port of a sealing structure according to an embodiment of the present invention;

[0032] Figure 4Schematic diagram of the structure of the upper valve port of the sealing structure of an embodiment of the present invention.

[0033] Icons: 100-valve needle; 200-valve seat; 210-ring platform; 201-matching inner cavity; 202-installing inner cavity; 300-upper valve port; 310-upper valve port boss; 311-connecting platform; 312-second step portion; 313-groove; 400-lower valve port; 410-lower valve port boss; 411-inner convex ring; 412-outer convex ring; 413-sealing groove; 414-vent; 500-first sealing ring; 600-sealing block; 610-protrusion; 620-first step portion; 710-second sealing ring; 720-sealing ring. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0039] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0040] Please refer to Figure 1 and Figure 2 , this embodiment provides a sealing structure, including a valve needle 100, a valve seat 200, a valve port structure, a first sealing ring 500, and a sealing block 600;

[0041] The valve needle 100 is movably disposed in a matching inner cavity 201 at the bottom of the valve seat 200;

[0042] The valve port structure includes an upper valve port 300 and a lower valve port 400; the top of the upper valve port 300 is connected to the valve seat 200;

[0043] An upper valve port boss 310 is provided at the bottom of the upper valve port 300, and a lower valve port boss 410 is provided at the top of the lower valve port 400; an annular sealing groove 413 is provided on the top surface of the lower valve port boss 410; a first sealing ring 500 is provided at the bottom of the sealing groove 413, and a sealing block 600 is sealedly provided at the top of the sealing groove 413; and the top of the sealing block 600 abuts against the upper valve port boss 310, and the bottom of the sealing block 600 abuts against the first sealing ring 500; the bottom of the valve needle 100 can abut against the top of the sealing block 600;

[0044] A vent hole 414 is provided on the lower valve port boss 410 , and the vent hole 414 penetrates from the inner wall of the sealing groove 413 to the outer wall of the lower valve port 400 .

[0045] The valve port structure of the sealing structure of the present solution includes a split upper valve port 300 and a lower valve port 400. An upper valve port boss 310 is provided at the bottom of the upper valve port 300, and a lower valve port boss 410 is provided at the top of the lower valve port 400. The first sealing ring 500 and the sealing block 600 are clamped between the upper valve port boss 310 and the lower valve port boss 410, so as to ensure the sealing of the entire valve port structure. Furthermore, the sealing block 600 is pressed by the upper valve port boss 310 and the lower valve port boss 410, and the first sealing ring 500 is placed at the lower end of the sealing block 600 to provide sealing and pressing force; at the same time, a vent hole 414 is provided on the lower valve port 400 to prevent the sealing block 600 from being deformed toward the middle due to local high pressure in the cavity of the sealing block 600. The upper valve port 300 is tightly connected to the valve seat 200 to ensure the sealing effect of the valve seat 200 and the valve port structure. In summary, such a sealing structure adopts a method of fixing the position of the sealing block 600 to prevent the sealing block 600 from deforming or displacing during use, which may cause product sealing failure, thereby ensuring the overall sealing performance.

[0046] Please continue reading Figure 1 , Figure 2 , Figure 3 and Figure 4 , to understand more structural details of the sealing structure. The sealing block 600 is a ring-shaped structure.

[0047] It can also be seen from the figure that in an optional embodiment, the lower valve port boss 410 includes an inner convex ring 411 and an outer convex ring 412 arranged concentrically, the outer convex ring 412 is flush with the outer wall of the lower valve port 400, and the inner convex ring 411 is flush with the inner wall of the lower valve port 400; the inner convex ring 411 and the outer convex ring 412 enclose a sealing groove 413; the upper valve port boss 310 is arranged on the outer convex ring 412, the top of the sealing block 600 abuts against the bottom of the upper valve port boss 310, and the sealing block 600 is located above the inner convex ring 411; and the sealing block 600 can be tightly embedded in the sealing groove 413, and the first sealing ring 500 provides elastic force so that the sealing block 600 can keep against the upper valve port boss 310. The inner convex ring 411 and the outer convex ring 412 jointly limit the bottom of the sealing block 600 to achieve sealing of the bottom of the sealing block 600.

[0048] from Figure 2 and Figure 3 As can be seen in the figure, in an optional embodiment, the bottom of the sealing block 600 has an annular protrusion 610, and the protrusion 610 is embedded in the opening of the sealing groove 413. That is, the side wall of the protrusion 610 can be sealed with the annular inner wall of the sealing groove 413.

[0049] Furthermore, along the radial direction of the sealing block 600, the protrusion 610 is flush with the outer peripheral wall of the sealing block 600, and the protrusion 610 and the bottom of the sealing block 600 form a first step 620. The first step 620 is directly opposite to the inner convex ring 411, and the first step 620 can be supported on the top of the inner convex ring 411. The protrusion 610 here has the function of guiding and limiting.

[0050] In an optional embodiment, the vent hole 414 extends along the radial direction of the lower valve port 400. This simplifies the arrangement of the vent hole 414. Optionally, along the axial centerline direction of the valve port structure, the top wall of the vent hole 414 is flush with the top surface of the upper valve port boss 310.

[0051] In an optional embodiment, the first sealing ring 500 is an O-ring.

[0052] Further, from Figure 1 and Figure 4 It can also be seen that in an optional embodiment, the sealing structure also includes a second sealing ring 710; a ring platform 210 is provided at the bottom of the valve seat 200; an annular connecting platform 311 is provided at the top of the upper valve port 300, and the connecting platform 311 forms an annular second step portion 312 close to the outer wall of the upper valve port 300; the ring platform 210 is sleeved on the second step portion 312; the top of the connecting platform 311 and the bottom of the valve seat 200 enclose an installation cavity 202; the second sealing ring 710 and the sealing ring 720 are arranged in the installation cavity 202; a groove 313 is provided on the connecting platform 311, and the groove 313 is connected to the installation cavity 202.

[0053] Optionally, the second sealing ring 710 is an O-ring or a D-ring. It is not difficult to understand that in other embodiments of the present invention, the second sealing ring 710 can also be other structures, which is only an example and not limited here.

[0054] The sealing structure also includes a sealing ring 720; the second sealing ring 710 and the sealing ring 720 are both disposed in the installation inner cavity 202; along the radial direction of the valve seat 200, the annular platform 210, the second sealing ring 710 and the sealing ring 720 are arranged in sequence.

[0055] When the mechanism works for a long time, local high pressure may be formed at the second sealing ring 710 and the sealing ring 720. In order to prevent the seal and the valve needle 100 from being locally locked, the upper valve port 300 is provided with a groove 313 to balance the local pressure. In an optional embodiment, the sealing ring 720 is sleeved on the outside of the valve needle 100, and the valve needle 100 and the sealing ring 720 are interference fit. In this way, the sealing of the matching inner cavity 201 of the valve needle 100 and the valve seat 200 is guaranteed. Optionally, the sealing ring 720 is made of plastic. It is not difficult to understand that in other embodiments of the present invention, the sealing ring 720 can also be made of other materials. This is just an example.

[0056] like Figure 4 As shown, in an optional embodiment, along the axis direction of the valve seat 200, the top of the groove 313 penetrates to the top surface of the connecting platform 311; along the radial direction of the valve seat 200, the groove 313 penetrates to the inner wall of the connecting platform 311 close to the matching inner cavity 201. That is, the notch of the groove 313 is open to both the valve seat 200 and the matching inner cavity 201, so as to ensure the balance of the pressure out of the upper valve port 300.

[0057] In a second aspect, the present invention provides an electronic expansion valve, the electronic expansion valve comprising any sealing structure in the aforementioned embodiments.

[0058] In summary, the embodiments of the present invention provide a sealing structure and an electronic expansion valve, which have at least the following advantages:

[0059] The sealing block 600 is pressed by the upper valve port boss 310 and the lower valve port boss 410. A first sealing ring 500 is placed at the lower end of the sealing block 600 to provide sealing and pressing force. A vent hole 414 is provided on the lower valve port 400 to prevent the sealing block 600 from being deformed toward the middle due to local high pressure in the cavity of the sealing block 600.

[0060] When the mechanism works for a long time, local high pressure may be formed at the sealing ring 720. In order to prevent the sealing ring 720 and the valve needle 100 from being locally locked, the upper valve port 300 is provided with a groove 313 to balance the local pressure.

[0061] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A sealing structure, characterized in that: include: A valve needle (100), a valve seat (200), a valve port structure, a first sealing ring (500), and a sealing block (600); The valve needle (100) is movably disposed in a matching inner cavity (201) at the bottom of the valve seat (200); The valve port structure comprises an upper valve port (300) and a lower valve port (400); the top of the upper valve port (300) is connected to the valve seat (200); the bottom of the upper valve port (300) is provided with an upper valve port boss (310), and the top of the lower valve port (400) is provided with a lower valve port boss (410); the top surface of the lower valve port boss (410) is provided with an annular sealing groove (413); the first sealing ring (500) is provided at the bottom of the sealing groove (413), and the sealing block (600) is sealed at the top of the sealing groove (413); the top of the sealing block (600) abuts against the upper valve port boss (310), and the bottom of the sealing block (600) abuts against the first sealing ring (500); the bottom of the valve needle (100) can abut against the top of the sealing block (600); The lower valve port boss (410) is provided with a vent hole (414), and the vent hole (414) penetrates from the inner wall of the sealing groove (413) to the outer wall of the lower valve port (400).

2. The sealing structure according to claim 1, characterized in that: The lower valve port boss (410) comprises an inner convex ring (411) and an outer convex ring (412) which are arranged concentrically, the outer convex ring (412) being flush with the outer wall of the lower valve port (400), and the inner convex ring (411) being flush with the inner wall of the lower valve port (400); the inner convex ring (411) and the outer convex ring (412) enclose the sealing groove (413); The upper valve mouth boss (310) is arranged on the outer convex ring (412), the top of the sealing block (600) is abutted against the bottom of the upper valve mouth boss (310), and the sealing block (600) is located above the inner convex ring (411); and the sealing block (600) can be tightly embedded in the sealing groove (413), and the first sealing ring (500) provides elastic force so that the sealing block (600) can maintain abutment against the upper valve mouth boss (310).

3. The sealing structure according to claim 1, characterized in that: The vent hole (414) extends along the radial direction of the lower valve port (400).

4. The sealing structure according to claim 1, characterized in that: The first sealing ring (500) is an O-ring.

5. The sealing structure according to claim 1, characterized in that: The bottom of the sealing block (600) has an annular protrusion (610), and the protrusion (610) is embedded in the opening of the sealing groove (413).

6. The sealing structure according to any one of claims 1 to 5, characterized in that: Also includes a second sealing ring (710); The bottom of the valve seat (200) is provided with an annular platform (210); the top of the upper valve port (300) is provided with an annular connecting platform (311), and the connecting platform (311) forms an annular second step portion (312) close to the outer wall of the upper valve port (300); the annular platform (210) is sleeved on the second step portion (312); the top of the connecting platform (311) and the bottom of the valve seat (200) form an installation cavity (202); the second sealing ring (710) is arranged in the installation cavity (202); the connecting platform (311) is provided with a groove (313), and the groove (313) is connected to the installation cavity (202).

7. The sealing structure according to claim 6, characterized in that: Also included is a sealing ring (720); The second sealing ring (710) and the sealing ring (720) are both arranged in the installation inner cavity (202); along the radial direction of the valve seat (200), the annular platform (210), the second sealing ring (710) and the sealing ring (720) are arranged in sequence.

8. The sealing structure according to claim 7, characterized in that: The sealing ring (720) is sleeved on the outside of the valve needle (100), and the valve needle (100) and the sealing ring (720) are interference fit.

9. The sealing structure according to claim 6, characterized in that: Along the axial centerline direction of the valve seat (200), the top of the groove (313) penetrates to the top surface of the connecting platform (311); Along the radial direction of the valve seat (200), the groove (313) penetrates to the inner wall of the connecting platform (311) close to the matching inner cavity (201).

10. An electronic expansion valve, characterized in that: The electronic expansion valve comprises the sealing structure according to any one of claims 1-9.

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