Valve seat assembly and electronic expansion valve

Abstract

The embodiment of the utility model provides a valve seat assembly and an electronic expansion valve, and relates to the field of electric valves. The valve seat assembly comprises a valve base and a guide seat. The valve base is provided with a mounting cavity with an opening in the top, the bottom of the valve base is provided with a communicating port communicating with the mounting cavity, and a sealing valve seat is formed on the periphery of the communicating port; a plurality of communicating holes communicating with the mounting cavity are formed in the side wall of the valve base and located on the side, close to the opening, of the sealing valve seat at intervals in the radial direction of the valve base. The guide seat is provided with a first end and a second end which are opposite to each other, a through guide channel is formed in the guide seat in the direction from the first end to the second end, and the guide channel is used for assembling the valve needle and guiding when the valve needle moves. The second end of the guide seat is inserted into the assembly cavity through the opening, and the second end is located above the communicating hole so that a spacing ring groove can be formed between the second end and the sealing valve seat. According to the invention, the processing difficulty is obviously reduced while the function of the spacing ring groove is reserved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric control valve, specifically, a valve seat assembly and electronic expansion valve. BACKGROUND

[0002] The electronic expansion valve is a core component in a refrigeration and air conditioning system, and is mainly used for accurately controlling the flow of refrigerant to achieve efficient and stable operation. The electronic expansion valve generally includes a valve seat, a shell, a valve needle, and a driving assembly. A through hole is provided at the center of the bottom of the valve seat, and a plurality of through holes are provided on the side wall of the valve seat. The valve needle is installed in the valve seat, the driving assembly is installed in the shell, and the shell is installed on the valve seat to drive the valve needle to move by driving the driving assembly and the valve needle in transmission connection.

[0003] In the prior art, in order to have low flow resistance, an annular groove is generally provided at the position corresponding to the side hole on the inner side of the valve seat.

[0004] However, since the annular groove is provided on the inner side wall of the valve seat, the machining difficulty of the valve seat is increased, which makes the requirement for the machining equipment higher and the machining efficiency slower. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a valve seat assembly and an electronic expansion valve, which can reduce the machining difficulty of the valve seat, thereby improving the machining efficiency.

[0006] The embodiment of the utility model can be implemented as follows:

[0007] In a first aspect, the utility model provides a valve seat assembly, which comprises:

[0008] A valve base has an installation cavity with an open top, a communication port is provided on the bottom of the valve base and communicates with the installation cavity, and a sealing valve seat is formed around the communication port. A plurality of communication holes are provided on the side wall of the valve base and spaced apart along the radial direction of the valve base, and the communication holes communicate with the installation cavity.

[0009] The guide seat has opposite first and second ends, and a guide channel is provided in the guide seat and penetrates from the first end to the second end. The guide channel is used for assembling the valve needle and guiding the valve needle during movement.

[0010] The second end of the guide seat is inserted into the installation cavity through the opening, and the second end is located above the communication hole to form an annular groove between the second end and the sealing valve seat.

[0011] In an optional embodiment, an abutting ring table is arranged on the outer periphery of the guide seat, and the abutting ring table abuts against the end of the valve seat provided with the opening to limit the insertion depth of the guide seat.

[0012] In an optional embodiment, the abutting ring table is welded with the valve seat.

[0013] In an optional embodiment, a limiting ring table is arranged on the inner side wall of the first end of the guide channel, and the limiting ring table is used for abutting against a spring driving the valve needle to move.

[0014] In an optional embodiment, the limiting ring table is integrally formed with the guide seat.

[0015] In an optional embodiment, the valve seat assembly further comprises a valve top seat, the valve top seat has opposite first and second sides, and the valve top seat is provided with a through hole for the valve needle top end to pass through in the direction from the first side to the second side.

[0016] The first side of the valve top seat is fitted on the top of the valve seat, and is fixedly connected with the valve seat, and the abutting ring table is clamped between the valve seat and the valve top seat.

[0017] In an optional embodiment, the first side of the valve top seat and the outer periphery of the through hole are provided with a fitting ring groove.

[0018] The top of the valve seat is inserted into the fitting ring groove, and the abutting ring table is clamped between the top surface of the valve seat and the bottom wall of the fitting ring groove.

[0019] In an optional embodiment, the fitting ring groove is provided with a chamfer away from the side of the bottom wall thereof.

[0020] The valve seat is welded with the valve top seat.

[0021] In an optional embodiment, the valve seat assembly further comprises a limiting ring.

[0022] The valve top seat is provided with a mounting ring groove on the side of the second side and the outer periphery of the through hole.

[0023] The limiting ring is mounted in the mounting ring groove, and the limiting ring is used for abutting against a spring driving the valve needle to reset.

[0024] In a second aspect, the utility model provides a kind of electronic expansion valve, including shell, valve needle, drive assembly and the valve seat assembly of any one of the foregoing embodiments;

[0025] The drive assembly is mounted in the shell, and the valve needle is mounted in the guide channel.

[0026] The housing is mounted to the valve seat assembly, and the drive assembly is in driving connection with the valve needle, and the drive assembly can drive the valve needle to move.

[0027] The valve seat assembly and the electronic expansion valve have the following beneficial effects.

[0028] The valve seat assembly is provided with a valve base and a guide seat, the second end of the guide seat is inserted into the assembly cavity through the opening of the valve base, the second end is above the communication hole after the guide seat is assembled, and a spacing annular groove is formed between the second end and the sealing valve seat, so that the spacing annular groove can be obtained without machining the annular groove on the inner side wall, and the machining difficulty of the valve base assembly is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0030] Figure 1 A cross-sectional structure schematic diagram of an electronic expansion valve provided by the present embodiment is shown in the figure.

[0031] Figure 2 A cross-sectional structure schematic diagram of an electronic expansion valve provided by the present embodiment is shown in the figure. Figure 1 A cross-sectional structure schematic diagram of an electronic expansion valve provided by the present embodiment is shown in the figure.

[0032] Figure 3 A cross-sectional structure schematic diagram of an electronic expansion valve provided by the present embodiment is shown in the figure. Figure 2 A cross-sectional structure schematic diagram of an electronic expansion valve provided by the present embodiment is shown in the figure.

[0033] Figure 4 A cross-sectional structure schematic diagram of an electronic expansion valve provided by the present embodiment is shown in the figure. Figure 2 A cross-sectional structure schematic diagram of an electronic expansion valve provided by the present embodiment is shown in the figure.

[0034] Figure 5 A cross-sectional structure schematic diagram of an electronic expansion valve provided by the present embodiment is shown in the figure.

[0035] Figure 6 A cross-sectional structure schematic diagram of an electronic expansion valve provided by the present embodiment is shown in the figure. Figure 5 A cross-sectional structure schematic diagram of an electronic expansion valve provided by the present embodiment is shown in the figure.

[0036] Figure 7 A cross-sectional structure schematic diagram of an electronic expansion valve provided by the present embodiment is shown in the figure. Figure 5 A cross-sectional structure schematic diagram of an electronic expansion valve provided by the present embodiment is shown in the figure.

[0037] Figure 8 A cross-sectional structure schematic diagram of an electronic expansion valve provided by the present embodiment is shown in the figure. Figure 5 A cross-sectional structure schematic diagram of an electronic expansion valve provided by the present embodiment is shown in the figure.

[0038] Figure 9 For Figure 5 Structure diagram of valve top seat of valve seat assembly.

[0039] Figure: 100-valve seat assembly; 110-valve bottom seat; 111-opening; 112-mounting cavity; 113-communication port; 114-sealing valve seat; 115-communication hole; 130-guide seat; 131-first end; 132-second end; 133-guide channel; 134-separation ring groove; 135-abutment ring table; 136-insertion ring groove; 137-limit ring table; 150-valve top seat; 151-first side; 152-second side; 153-through hole; 154-fitting ring groove; 155-chamfer; 156-mounting ring groove; 157-positioning ring groove; 170-limiting ring; 300-electronic expansion valve; 310-valve needle; 311-fitting ring table; 330-driving assembly; 350-housing. DETAILED DESCRIPTION

[0040] In the prior art, in order to have low flow resistance, an annular groove is usually arranged at the position corresponding to the side hole on the inner side of the valve seat. However, since the annular groove is arranged on the inner side wall of the valve seat, the machining difficulty of the valve seat is increased, which results in higher requirements for the machining equipment and slower machining efficiency.

[0041] In view of the above problems, the utility model provides a valve seat assembly and an electronic expansion valve, which can facilitate the machining of the valve seat assembly, thereby improving the problems of high machining difficulty and low efficiency of the valve seat.

[0042] To make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the utility model.

[0044] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0045] In the description of the utility model, it is necessary to explain, if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the utility model product when it is usually placed, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the device or element must have a specific orientation, structure and operation, therefore, it cannot be understood as a limitation on the utility model.

[0046] In addition, if the terms "first", "second" and the like are used only for differentiation, and cannot be understood as indicating or implying relative importance.

[0047] It should be noted that the features in the embodiments of the utility model can be combined with each other without conflict.

[0048] The overall structure, working principle and technical effects of the valve seat assembly and the electronic expansion valve provided by the utility model are described in detail below through embodiments and in combination with the drawings.

[0049] Please refer to Figure 1 and Figure 5 The embodiment provides an electronic expansion valve 300, which can be used to accurately control the flow of refrigerant in a refrigeration and air conditioning system.

[0050] The electronic expansion valve 300 comprises a shell 350, a valve needle 310, a driving assembly 330 and a valve seat assembly 100. The driving assembly 330 is installed in the shell 350. The valve needle 310 is installed in the valve seat assembly 100. The shell 350 is installed in the valve seat assembly 100. The driving assembly 330 is in transmission connection with the valve needle 310, and the driving assembly 330 can drive the valve needle 310 to move between an open position and a closed position.

[0051] Please refer to Figures 1 to 9In the present embodiment, the valve seat assembly 100 comprises a valve base 110 and a guide seat 130. The valve base 110 has a mounting cavity 112 with a top opening 111. The bottom of the valve base 110 is provided with a communication port 113 in communication with the mounting cavity 112, and the periphery of the communication port 113 is formed with a sealing valve seat 114. The side wall of the valve base 110, on the side of the sealing valve seat 114 close to the opening 111, is provided with a plurality of communication holes 115 in communication with the mounting cavity 112 and spaced apart along the radial direction of the valve base 110. One of the communication holes 115 and the communication port 113 serves as the inflow of the refrigerant, and the other serves as the outflow of the refrigerant. The guide seat 130 has opposite first and second ends 131 and 132, and is provided with a guide passage 133 extending through the guide seat 130 from the first end 131 to the second end 132. The second end 132 of the guide seat 130 is inserted into the mounting cavity 112 through the opening 111, and the second end 132 is located above the communication holes 115 to form a spacing annular groove 134 between the second end 132 and the sealing valve seat 114. The valve needle 310 is installed in the guide passage 133 and can move up and down along the guide passage 133. When the valve needle 310 is in the closed state, the lower end of the valve needle 310 abuts against the sealing valve seat 114 to block the communication port 113, thereby blocking the communication between the communication port 113 and the communication holes 115. After the valve needle 310 is lifted relative to the sealing valve seat 114, the valve needle 310 opens to unblock the communication port 113, allowing the communication port 113 and the communication holes 115 to communicate.

[0052] In the present embodiment, the valve seat assembly 100 comprises a valve base 110 and a guide seat 130. The valve base 110 has a mounting cavity 112 with a top opening 111. The bottom of the valve base 110 is provided with a communication port 113 in communication with the mounting cavity 112, and the periphery of the communication port 113 is formed with a sealing valve seat 114. The side wall of the valve base 110, on the side of the sealing valve seat 114 close to the opening 111, is provided with a plurality of communication holes 115 in communication with the mounting cavity 112 and spaced apart along the radial direction of the valve base 110. One of the communication holes 115 and the communication port 113 serves as the inflow of the refrigerant, and the other serves as the outflow of the refrigerant. The guide seat 130 has opposite first and second ends 131 and 132, and is provided with a guide passage 133 extending through the guide seat 130 from the first end 131 to the second end 132. The second end 132 of the guide seat 130 is inserted into the mounting cavity 112 through the opening 111, and the second end 132 is located above the communication holes 115 to form a spacing annular groove 134 between the second end 132 and the sealing valve seat 114. The valve needle 310 is installed in the guide passage 133 and can move up and down along the guide passage 133. When the valve needle 310 is in the closed state, the lower end of the valve needle 310 abuts against the sealing valve seat 114 to block the communication port 113, thereby blocking the communication between the communication port 113 and the communication holes 115. After the valve needle 310 is lifted relative to the sealing valve seat 114, the valve needle 310 opens to unblock the communication port 113, allowing the communication port 113 and the communication holes 115 to communicate.

[0053] It should be noted that the valve base 110 and the guide seat 130 are machined separately, and then the guide seat 130 is inserted into the valve base 110 by compression technology, liquid nitrogen freezing technology, etc., so that the valve base 110 and the guide seat 130 are interference fit to ensure the concentricity and spacing of the two.

[0054] Please refer to Figures 1 to 9 In the present embodiment, the outer periphery of the guide seat 130 is provided with an abutting ring table 135, which abuts against the end of the valve base 110 provided with the opening 111 to limit the insertion depth of the guide seat 130.

[0055] The abutting ring table 135 can limit the insertion depth of the guide seat 130 by abutting, so that the assembly is facilitated.

[0056] Please refer to Figures 1 to 4 In an embodiment of the present application, the abutting ring table 135 is arranged at the middle of the guide seat 130 in the height direction, and the abutting ring table 135 is welded with the valve base 110. The guide seat 130 is divided into upper and lower parts by the abutting table. The upper part is exposed to the valve base 110 and is combined with the valve base 110 to form the base of the electronic expansion valve 300. The outer periphery of the top end of the guide seat 130 is provided with an insertion ring groove 136, and one end of the opening 111 of the shell 350 is inserted into the insertion ring groove 136 and welded with the guide seat 130.

[0057] Of course, the guide seat 130 can also be arranged in a cylindrical shape without the abutting ring table 135, and the cylindrical guide seat 130 is directly nested in the mounting cavity 112 of the valve base 110, and the lower end is spaced from the sealing valve seat 114 to expose the communication hole 115.

[0058] Further, the limiting ring table 137 is arranged on the inner side wall of the first end 131 of the guide channel 133. The limiting ring table 137 is used for abutting the spring for driving the valve needle 310 to move. The top end of the valve needle 310 passes through the center hole of the limiting ring table 137 to the shell 350 and is in transmission connection with the driving assembly 330. The outer periphery of the valve needle 310 near the middle part is provided with a cooperating ring table 311 matched with the limiting ring table 137. The spring for driving the valve needle 310 to reset is generally sleeved on the outer side of the valve needle 310, one end of the spring abuts against the cooperating ring table 311, and the other end of the spring abuts against the limiting ring table 137.

[0059] Please refer to Figures 1 to 4 In this embodiment, the limiting ring table 137 is integrally formed with the guide seat 130. In this way, the number of parts can be reduced to facilitate processing and assembly.

[0060] It should be noted that when the limiting ring table 137 is integrally formed with the guide seat 130, the valve needle 310 and the spring matched with the valve needle 310 and other accessories are first installed in the guide seat 130, and then the guide seat 130 is inserted into the valve base 110 and welded with the valve base 110.

[0061] Of course, in this embodiment, the limiting ring table 137 can also be formed separately from the guide seat 130 and assembled in the guide seat 130 by pressing or welding.

[0062] The specific structure of the valve seat assembly 100 described above can facilitate the processing of the valve seat assembly 100 of the electronic expansion valve 300 with a relatively small caliber. In the case of reduced processing difficulty, the processing efficiency and assembly efficiency can be better guaranteed.

[0063] Referring to Figures 5 to 9 In another embodiment of the present application, the valve seat assembly 100 further comprises a valve top seat 150 having opposite first and second sides 151 and 152. The valve top seat 150 is provided with a through hole 153 for the valve needle 310 to pass through in the direction from the first side 151 to the second side. The first side 151 of the valve top seat 150 is assembled on the top of the valve bottom seat 110 and fixedly connected with the valve bottom seat 110, and the abutting ring platform 135 is clamped between the valve bottom seat 110 and the valve top seat 150.

[0064] This embodiment sets the valve seat assembly 100 as the valve bottom seat 110, the guide seat 130 and the valve top seat 150, so that the machining efficiency can be improved under the condition of reducing the machining difficulty, thereby being applicable to the machining of medium and large-sized electronic expansion valves 300 with larger caliber. In particular, the guide seat 130 does not need to be fixed separately during assembly, but can be fixed by clamping between the valve bottom seat 110 and the valve top seat 150.

[0065] The reason why this embodiment can improve the machining efficiency is that the valve bottom seat 110, the guide seat 130 and the valve top seat 150 are machined separately, so that different cylindrical materials with different inner and outer diameters can be selected for machining, thereby reducing the cutting amount during machining, improving the machining efficiency of each part, and improving the overall machining efficiency.

[0066] Referring to Figures 5 to 9 In this embodiment, the guide seat 130 is in the shape of a cylinder, and the abutting ring platform 135 is arranged outside the first end 131 of the guide seat 130. When the guide seat 130 is machined, a raw cylindrical material with an inner diameter slightly smaller than the through hole 153 and an outer diameter slightly larger than the outer diameter of the abutting ring platform 135 can be selected for machining, so that the machining is simple and the cutting amount during machining is small, and the machining can be quickly realized.

[0067] In this embodiment, the first side 151 of the valve top seat 150 is provided with an assembly ring groove 154 outside the peripheral edge of the through hole 153. The top of the valve bottom seat 110 is inserted into the assembly ring groove 154, and the abutting ring platform 135 is clamped between the top surface of the valve bottom seat 110 and the bottom wall of the assembly ring groove 154.

[0068] This embodiment sets the assembly ring groove 154 in the valve top seat 150, so that the assembly of the valve top seat 150 and the clamping of the guide seat 130 can be better realized.

[0069] Referring to Figures 5 to 9In this embodiment, the assembly ring groove 154 is provided with a chamfer 155 away from the side of the bottom wall. The chamfer 155 is provided to facilitate the insertion and installation. The valve base 110 is welded with the valve top seat 150. When welding, the welding can be performed at the chamfer 155, so that the welding does not affect the end face of the first side 151 of the valve top seat 150, thereby facilitating the assembly of the electronic expansion valve 300.

[0070] The valve seat assembly 100 is designed as the valve base 110, the guide seat 130 and the valve top seat 150 in this embodiment, and the guide seat 130 is fixed by clamping. Therefore, when assembling, only the valve base 110 and the valve top seat 150 need to be welded together, and the guide seat 130 does not need to be welded with other components, and only one welding is required.

[0071] Please refer to Figures 5 to 9 In this embodiment, the valve seat assembly 100 further comprises a limiting ring 170. The valve top seat 150 is located on the second side, and the outer periphery of the through hole 153 is provided with an installation ring groove 156. The limiting ring 170 is installed in the installation ring groove 156, and the limiting ring 170 is used to abut the spring for driving the valve needle 310 to reset.

[0072] When assembling the electronic expansion valve 300, the valve base 110, the guide seat 130 and the valve top seat 150 can be assembled together by the above-mentioned method, and then the valve needle 310, the spring and other matching components are installed into the guide channel 133 through the through hole 153, and then the limiting ring 170 is assembled into the installation ring groove 156. The installation of the limiting ring 170 can limit the assembly position of the limiting ring 170, thereby facilitating positioning and welding. One end of the spring can abut against the limiting ring, and the other end can abut against the matching ring table 311.

[0073] Of course, the limiting ring 170 can also be connected with the valve top seat 150 by interference fit, threaded connection and the like. Even the limiting ring 170 can be integrally formed with the valve top seat 150.

[0074] Please refer to Figures 5 to 9 In this embodiment, the outer periphery of the end of the second side of the valve top seat 150 is provided with a positioning ring groove 157, and the shell 350 is inserted into the positioning ring groove 157. The end of the shell 350 abuts against the valve top seat 150, and the two are welded.

[0075] Please refer to Figure 1 and Figure 5In the embodiment, the electronic expansion valve 300 is a double-valve needle 310 electronic expansion valve 300. In the double-valve needle 310 electronic expansion valve 300, the valve needle 310 includes a small valve needle 310 and a large valve needle 310, the small valve needle 310 is assembled in the large valve needle 310, and the top end of the small valve needle 310 is in transmission connection with the driving assembly 330, the small valve needle 310 is driven to move by the driving assembly 330, and then the small valve needle 310 drives the large valve needle 310 to move. The spring is sleeved outside the large valve needle 310, and the cooperation ring table 311 is also arranged on the outer periphery of the large valve needle 310. In the initial stage of opening of the valve needle 310, only the small valve needle 310 is lifted due to the action of the spring, and the large valve needle 310 is not lifted, and only when the small valve needle 310 abuts against the large valve needle 310, the small valve needle 310 drives the large valve needle 310 to be lifted against the elastic force of the spring.

[0076] Of course, in some embodiments of the application, the electronic expansion valve 300 can also be a single-valve needle 310 electronic expansion valve 300. In this embodiment, the spring can be cancelled.

[0077] Please refer to Figure 1 and Figure 5 Secondly, the driving assembly 330 includes a rotor and a driving nut, the rotor is rotatably installed in the shell 350, and the rotor shaft is provided with threads. The driving nut is installed in the rotor shaft through nut cooperation. The valve seat assembly 100 is also provided with a sliding groove for limiting rotation of the driving nut, the driving nut is arranged in the sliding groove, and the top end of the small valve needle 310 is connected with the driving nut. Rotation of the rotor can drive the driving nut to move along the sliding groove, so as to drive the valve needle 310 to move.

[0078] In summary, in the embodiment, the valve seat assembly 100 is provided with a split valve base 110 and a guide seat 130, the second end 132 of the guide seat 130 is inserted into the assembly cavity from the opening 111 of the valve base 110, the second end 132 is above the communication hole 115 after the guide seat 130 is assembled, and the interval annular groove 134 is formed between the second end 132 and the sealing valve seat 114, so that the interval annular groove 134 can be obtained without machining the annular groove on the inner side wall, and the machining difficulty of the valve base 110 assembly is reduced.

[0079] The above merely illustrates the specific embodiments of the utility model, but the protection scope of the utility model is not limited to this, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A valve seat assembly, characterized by The valve seat assembly comprises: a valve base (110) having a mounting cavity (112) with a top opening (111), a bottom of the valve base (110) being provided with a communication opening (113) in communication with the mounting cavity (112), a periphery of the communication opening (113) being formed with a sealing valve seat (114); a side wall of the valve base (110) being located on a side of the sealing valve seat (114) close to the opening (111) and being provided with a plurality of communication holes (115) in communication with the mounting cavity (112) and being spaced apart along a radial direction of the valve base (110); a guide seat (130) having opposite first and second ends (131, 132), the guide seat (130) being provided with a guide channel (133) penetrating through the guide seat (130) from the first end (131) to the second end (132), the guide channel (133) being used for assembling a valve needle (310) and guiding the valve needle (310) during movement of the valve needle (310); the second end (132) of the guide seat (130) is inserted into the mounting cavity (112) through the opening (111), and the second end (132) is located above the communication holes (115) to form a spacing annular groove (134) between the second end (132) and the sealing valve seat (114).

2. The valve seat assembly of claim 1, wherein, a periphery of the guide seat (130) is provided with an abutting annular platform (135), the abutting annular platform (135) abutting an end of the valve base (110) provided with the opening (111) to limit an insertion depth of the guide seat (130).

3. The valve seat assembly of claim 2, wherein, the abutting annular platform (135) is welded to the valve base (110).

4. Valve seat assembly according to any of claims 1-3, characterized in that a limiting annular platform (137) is arranged on an inner side wall of the first end (131) of the guide channel (133), the limiting annular platform (137) being used for abutting a spring driving the valve needle (310) to move.

5. The valve seat assembly of claim 4, wherein, the limiting annular platform (137) is integrally formed with the guide seat (130).

6. The valve seat assembly of claim 2, wherein, the valve seat assembly further comprises a valve top base (150) having opposite first and second sides (151, 152), the valve top base (150) being provided with a penetrating hole (153) penetrating through the valve top base (150) from the first side (151) to the second side (152) and being used for the valve needle (310) to pass through; the first side (151) of the valve top base (150) is assembled to a top of the valve base (110) and is fixedly connected to the valve base (110), and the abutting annular platform (135) is clamped between the valve base (110) and the valve top base (150).

7. The valve seat assembly of claim 6, wherein, an assembly annular groove (154) is arranged on the first side (151) of the valve top base (150) and on a periphery of the penetrating hole (153); the top of the valve base (110) is inserted into the assembly annular groove (154), and the abutting annular platform (135) is clamped between a top surface of the valve base (110) and a bottom wall of the assembly annular groove (154).

8. The valve seat assembly of claim 7, wherein, a chamfer (155) is arranged on a side of the assembly annular groove (154) away from the bottom wall. The valve base (110) is welded with the valve top base (150).

9. The valve seat assembly of any one of claims 6 to 8, wherein, The valve seat assembly further comprises a limiting ring (170); The valve top base (150) is located at one side of the second side, and a mounting ring groove (156) is arranged at the outer periphery of the through hole (153); The limiting ring (170) is mounted in the mounting ring groove (156), and the limiting ring (170) is used for abutting against the spring for driving the valve needle (310) to reset.

10. An electronic expansion valve characterized by The valve seat assembly comprises a housing (350), a valve needle (310), a driving assembly (330) and the valve seat assembly according to any one of claims 1-9. The driving assembly (330) is mounted in the housing (350), and the valve needle (310) is mounted in the guide channel (133); The housing (350) is mounted on the valve seat assembly, and the driving assembly (330) is in transmission connection with the valve needle (310), and the driving assembly (330) can drive the valve needle (310) to move.

Images