Pressing sleeve, electronic expansion valve and air conditioner

Abstract

The utility model discloses a pressing sleeve, an electronic expansion valve and an air conditioner, which relate to the technical field of air conditioners, are applied to the electronic expansion valve, and are characterized in that the pressing sleeve comprises at least two sub-bodies which are arranged in a split manner, each sub-body is provided with an assembly groove, and the assembly groove is formed along the circumferential direction of a first valve needle of the electronic expansion valve; the sub-bodies are spliced to form a pressing sleeve, so that the assembling grooves are spliced to form an assembling hole, and the first valve needle movably penetrates through the assembling hole. According to the technical scheme, the machining and manufacturing process of parts of the electronic expansion valve is simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, and particularly relates to a pressing sleeve, an electronic expansion valve and an air conditioner. Background Art

[0002] An electronic expansion valve is an intelligent control element widely used in refrigeration and air conditioning systems. Its main function is to regulate the refrigerant flow in the system to achieve precise temperature control and efficient energy management.

[0003] There is a conventional electronic expansion valve, which includes a large valve needle, a small valve needle and a pressing sleeve assembly. The pressing sleeve assembly is fixed in the mounting hole of the large valve needle. The small valve needle passes through the pressing sleeve assembly, and the small valve needle can move relative to the pressing sleeve assembly or drive the large valve needle to move through the pressing sleeve assembly. Among them, the pressing sleeve assembly includes a pressing sleeve and a sealing gasket. The pressing sleeve and the sealing gasket are respectively sleeved on the outer wall of the small valve needle from both ends of the small valve needle, and then are abutted and buckled together.

[0004] The types of components forming such a pressing sleeve assembly are relatively numerous, resulting in a complex processing and manufacturing process. Summary of the Utility Model

[0005] The main object of the utility model is to propose a pressing sleeve, an electronic expansion valve and an air conditioner, aiming to simplify the processing and manufacturing process of the components of the electronic expansion valve.

[0006] To achieve the above object, the pressing sleeve proposed by the utility model is applied to an electronic expansion valve. The pressing sleeve includes at least two separately arranged sub-bodies. Each sub-body is provided with an assembly groove. Along the circumference of the first valve needle of the electronic expansion valve, the sub-bodies are spliced to form the pressing sleeve so that the assembly grooves are spliced to form an assembly hole, and the first valve needle movably passes through the assembly hole.

[0007] In an embodiment, the pressing sleeve is formed by splicing two of the sub-bodies.

[0008] In an embodiment, the sub-body is provided with a limiting structure for limiting the relative movement stroke of the first valve needle relative to the pressing sleeve.

[0009] In an embodiment, the limiting structure includes a first limiting groove provided on the inner wall of the assembly groove, which cooperates with a first limiting protrusion corresponding to the outer peripheral wall of the first valve needle. The first limiting protrusion is inserted into the first limiting groove to limit the relative movement stroke of the first valve needle relative to the pressing sleeve; or,

[0010] The limiting structure includes a second limiting protrusion provided on the inner wall of the assembly groove, which cooperates with a second limiting groove corresponding to the outer peripheral wall of the first valve needle. The second limiting protrusion is inserted into the second limiting groove to limit the relative movement stroke of the first valve needle relative to the pressing sleeve.

[0011] In one embodiment, the assembly hole includes a first sub-hole and a second sub-hole that communicate with each other. The inner diameter of the first sub-hole is larger than that of the second sub-hole, and both the first sub-hole and the second sub-hole are in clearance fit with the first valve needle.

[0012] In one embodiment, there is a first gap between the inner wall of the first sub-hole and the outer peripheral wall of the first valve needle, and a second gap between the inner wall of the second sub-hole and the outer peripheral wall of the first valve needle. The distance of the first gap is less than or equal to the distance of the second gap.

[0013] In one embodiment, the depth of the first sub-hole is greater than the depth of the second sub-hole; and / or,

[0014] The distance of the first gap ranges from 0.05 mm to 0.1 mm; and / or,

[0015] The distance of the second gap ranges from 0.1 mm to 0.2 mm.

[0016] In one embodiment, the sub-body is provided with an installation structure for positioning the elastic reset member of the electronic expansion valve.

[0017] In one embodiment, the installation structure includes a first installation groove provided on the inner wall of the assembly groove, and the first installation groove is provided at one end of the assembly groove facing the elastic reset member.

[0018] In one embodiment, the material of the sub-body is a non-metallic material.

[0019] In one embodiment, the material of the sub-body is an engineering plastic.

[0020] In one embodiment, the engineering plastic is polyphenylene sulfide or polyether ether ketone.

[0021] In one embodiment, the material of the sub-body includes, by weight percentage: 70% - 90% of engineering plastic and 10% - 30% of reinforcing fiber.

[0022] In one embodiment, the reinforcing fiber is glass fiber or carbon fiber.

[0023] The present utility model also proposes an electronic expansion valve, including:

[0024] The above-mentioned compression sleeve;

[0025] A first valve needle movably penetrating through the assembly hole; and

[0026] A second valve needle provided with an installation hole, and the compression sleeve is arranged in the installation hole.

[0027] In one embodiment, a terminal stop structure is provided on the periphery of the mounting hole, and the terminal stop structure blocks the compression sleeve from being disengaged from the mounting hole.

[0028] In one embodiment, a third gap is provided between the inner wall of the mounting hole and the outer peripheral wall of the compression sleeve.

[0029] In one embodiment, the distance range of the third gap is 0.05 mm to 0.1 mm.

[0030] In one embodiment, the second valve needle is further provided with a second mounting groove communicating with the mounting hole, and the electronic expansion valve further includes a sealing ring. The sealing ring is disposed in the second mounting groove and sleeved outside the first valve needle to seal and connect the first valve needle and the second valve needle, and the compression sleeve blocks the sealing ring from being disengaged from the second mounting groove.

[0031] The present utility model further provides an air conditioner, including the above-mentioned electronic expansion valve.

[0032] The compression sleeve in the technical solution of the present utility model includes at least two separately arranged sub-bodies. The compression sleeve is formed by splicing each sub-body along the circumferential direction of the first valve needle. The compression sleeve is composed of sub-bodies with the same material, structure and shape, which reduces the types of components in the electronic expansion valve, thereby simplifying the processing and manufacturing process of the components of the electronic expansion valve, and reducing the types of components that need to be processed during assembly, making the assembly more convenient. In addition, the assembly grooves on all the sub-bodies jointly form an assembly hole. When the first valve needle passes through the assembly hole and moves along its own axial direction, since each sub-body is spliced along the circumferential direction of the first valve needle, the first valve needle will not scatter each sub-body during movement, avoiding the influence of the movement of the first valve needle on the integrity of the compression sleeve, thereby improving the reliability of the compression sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0034] Figure 1 It is a schematic structural diagram of a sub-body of an embodiment of the compression sleeve provided by the present utility model;

[0035] Figure 2 It is a cross-sectional view of an embodiment of the compression sleeve provided by the present utility model;

[0036] Figure 3Cross-section of a partial structure of an embodiment of the electronic expansion valve provided by the present utility model Figure 1 ;

[0037] Figure 4 is Figure 3 the partial enlarged view at position A in ;

[0038] Figure 5 is Figure 3 the partial enlarged view at position B in ;

[0039] Figure 6 Cross-section of a partial structure of an embodiment of the electronic expansion valve provided by the present utility model Figure 2 ;

[0040] Figure 7 is Figure 6 the partial enlarged view at position C in ;

[0041] Figure 8 Cross-sectional view of the second valve needle of an embodiment of the electronic expansion valve provided by the present utility model

[0042] Figure 9 Cross-sectional view of an embodiment of the electronic expansion valve provided by the present utility model

[0043] Explanation of the reference numerals in the drawings:

[0044] 100, gland; 101, assembly hole; 1011, first sub-hole; 1012, second sub-hole; 102, first gap; 103, second gap; 110, sub-body; 111, assembly groove; 112, first limit groove; 113, first installation groove;

[0045] 200, first valve needle; 201, first limit protrusion;

[0046] 300, second valve needle; 310, small valve port; 320, installation hole; 321, third gap; 330, end stop structure; 340, second installation groove;

[0047] 400, valve seat; 410, large valve port;

[0048] 500, nut seat;

[0049] 600, elastic reset member;

[0050] 700, sealing ring.

[0051] The realization, functional characteristics and advantages of the object of the present utility model will be further described in conjunction with the embodiments with reference to the drawings. Specific embodiments

[0052] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0053] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0054] In the present utility model, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; "connection" can be a mechanical connection, an electrical connection, can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. Unless otherwise clearly limited, for those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0055] In addition, if there are descriptions such as "first" and "second" involved in the embodiments of the present utility model, the descriptions of "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0056] There is currently an electronic expansion valve, which includes a large valve needle, a small valve needle, and a bushing assembly. The bushing assembly is fixed in the mounting hole of the large valve needle. The small valve needle passes through the bushing assembly, and the small valve needle can move relative to the bushing assembly or drive the large valve needle to move through the bushing assembly. Among them, the bushing assembly includes a bushing and a gasket. The bushing and the gasket are respectively sleeved on the outer wall of the small valve needle from both ends of the small valve needle, and then abut and buckle together. The materials, structures, and shapes of the bushing and the gasket are all different, and completely different processes are required for manufacturing, resulting in a relatively complex processing and manufacturing process.

[0057] The present utility model provides a bushing applied to an electronic expansion valve.

[0058] Please refer to Figures 1 to 3 , Figure 1 which is a schematic structural diagram of a sub-body of an embodiment of the bushing provided by the present utility model, Figure 2 which is a cross-sectional view of an embodiment of the bushing provided by the present utility model, Figure 3 which is a cross-section of a partial structure of an embodiment of the electronic expansion valve provided by the present utility model Figure 1 .

[0059] In an embodiment of the present utility model, the bushing 100 includes at least two separately arranged sub-bodies 110. Each sub-body 110 is provided with an assembly groove 111. Along the circumferential direction of the first valve needle 200 of the electronic expansion valve, the sub-bodies 110 are spliced to form the bushing 100 such that the assembly grooves 111 are spliced to form an assembly hole 101, and the first valve needle 200 movably passes through the assembly hole 101.

[0060] The bushing 100 in the technical solution of the present utility model includes at least two separately arranged sub-bodies 110. By splicing the respective sub-bodies 110 along the circumferential direction of the first valve needle 200 to form the bushing 100, the bushing 100 is composed of sub-bodies 110 with the same material, structure, and shape, reducing the types of components in the electronic expansion valve, thereby simplifying the component processing and manufacturing process of the electronic expansion valve, and reducing the types of components that need to be processed during assembly, making the assembly more convenient. In addition, the assembly grooves 111 on all the sub-bodies 110 jointly form the assembly hole 101. When the first valve needle 200 passes through the assembly hole 101 and moves along its own axial direction, since the respective sub-bodies 110 are spliced along the circumferential direction of the first valve needle 200, the first valve needle 200 will not disperse the respective sub-bodies 110 during movement, avoiding the movement of the first valve needle 200 from affecting the integrity of the bushing 100, thereby improving the reliability of the bushing 100.

[0061] In one embodiment, the bushing 100 is formed by splicing two sub-bodies 110.

[0062] Refer to Figure 1 and Figure 2, in the embodiment of the present utility model, the compression sleeve 100 is composed of two sub-bodies 110. Each sub-body 110 is provided with an assembly groove 111. When the two sub-bodies 110 are spliced, the two assembly grooves 111 are mutually combined to form a complete assembly hole 101. In this embodiment, the types and quantities of the components constituting the compression sleeve 100 are both small, reducing the assembly difficulty of the compression sleeve 100 and improving the assembly efficiency of the electronic expansion valve.

[0063] In one embodiment, the sub-body 110 is provided with a limiting structure, and the limiting structure is used to limit the relative movement stroke of the first valve needle 200 relative to the compression sleeve 100.

[0064] In the embodiment of the present utility model, the sub-body 110 is provided with a limiting structure. The relative movement stroke of the first valve needle 200 relative to the compression sleeve 100 is limited through the limiting structure, that is, the relative movement stroke of the first valve needle 200 relative to the second valve needle 300 is limited. When the first valve needle 200 moves relative to the compression sleeve 100, the first valve needle 200 moves to open and close the small valve port 310, and the second valve needle 300 remains stationary and closes the large valve port 410; when the first valve needle 200 drives the compression sleeve 100 to move synchronously through the limiting structure, the first valve needle 200 and the second valve needle 300 move synchronously, and both the small valve port 310 and the large valve port 410 are in an open state.

[0065] In one embodiment, the limiting structure includes a first limiting groove 112 provided on the inner wall of the assembly groove 111 to cooperate with a first limiting protrusion 201 provided on the outer peripheral wall of the first valve needle 200. The first limiting protrusion 201 is inserted into the first limiting groove 112 to limit the relative movement stroke of the first valve needle 200 relative to the compression sleeve 100; or,

[0066] The limiting structure includes a second limiting protrusion provided on the inner wall of the assembly groove 111 to cooperate with a second limiting groove provided on the outer peripheral wall of the first valve needle 200. The second limiting protrusion is inserted into the second limiting groove to limit the relative movement stroke of the first valve needle 200 relative to the compression sleeve 100.

[0067] Referring to Figure 3 , in the embodiment of the present utility model, the limiting structure is the first limiting groove 112. The first limiting groove 112 is provided on the inner wall of the assembly groove 111 and cooperates with the first limiting protrusion 201 provided on the outer peripheral wall of the first valve needle 200, such that the first limiting protrusion 201 can only move within the first limiting groove 112, thereby limiting the relative movement stroke of the first valve needle 200 relative to the compression sleeve 100. The structure of the entire limiting structure is relatively simple and easy to process, which is beneficial to reducing the production cost of the compression sleeve 100.

[0068] In an embodiment of the present utility model, the limiting structure is a second limiting protrusion. The second limiting protrusion is provided on the inner wall of the assembly groove 111 and extends into a second limiting groove provided on the outer peripheral wall of the first valve needle 200, such that the second limiting protrusion can only move within the second limiting groove, thereby restricting the stroke of the relative movement of the first valve needle 200 relative to the pressure sleeve 100. The structure of the entire limiting structure is relatively simple and easy to process, which is beneficial to reducing the production cost of the pressure sleeve 100.

[0069] In an embodiment, the assembly hole 101 includes a first sub-hole 1011 and a second sub-hole 1012 that are connected and communicate with each other. The inner diameter of the first sub-hole 1011 is larger than the inner diameter of the second sub-hole 1012, and both the first sub-hole 1011 and the second sub-hole 1012 are in clearance fit with the first valve needle 200.

[0070] Referring to Figure 2 and Figure 3 In an embodiment of the present utility model, the inner diameter of the first sub-hole 1011 is larger than the inner diameter of the second sub-hole 1012, making the assembly hole 101 more conformable to the outer shape of the first valve needle 200, reducing the wobbling and offset of the first valve needle 200 within the assembly hole 101, and improving the stability of the first valve needle 200 during movement. Both the first sub-hole 1011 and the second sub-hole 1012 are in clearance fit with the first valve needle 200, reducing the contact and friction between the first valve needle 200 and the pressure sleeve 100. This not only reduces the wear of the first valve needle 200 and the pressure sleeve 100, extends the service life of the electronic expansion valve, but also reduces the noise caused by the movement of the first valve needle 200. Additionally, the clearance fit makes it easy for the first valve needle 200 to be inserted into the assembly hole 101 and move more smoothly within the assembly hole 101, avoiding jamming of the first valve needle 200, thereby improving the smoothness of the opening and closing of the electronic expansion valve.

[0071] In an embodiment, there is a first gap 102 between the inner wall of the first sub-hole 1011 and the outer peripheral wall of the first valve needle 200, and a second gap 103 between the inner wall of the second sub-hole 1012 and the outer peripheral wall of the first valve needle 200. The distance of the first gap 102 is less than or equal to the distance of the second gap 103.

[0072] In an embodiment of the present utility model, the distance of the first gap 102 is less than or equal to the distance of the second gap 103. When the distance of the first gap 102 is set to be less than the distance of the second gap 103, the pressing sleeve 100 guides the first valve needle 200 through the inner wall of the first sub-hole 1011, so that the first valve needle 200 moves along a predetermined trajectory, improving the positioning accuracy and repeated positioning accuracy of the first valve needle 200 during the movement process, thereby improving the accuracy of the opening and closing of the electronic expansion valve and the flow control; in addition, since the guiding is only through the inner wall of the first sub-hole 1011, only the manufacturing accuracy of the first gap 102 needs to be controlled, reducing the manufacturing difficulty of the pressing sleeve 100. When the distance of the first gap 102 is set to be equal to the distance of the second gap 103, the inner walls of the first sub-hole 1011 and the second sub-hole 1012 simultaneously guide the first valve needle 200, making the positioning accuracy and repeated positioning accuracy of the first valve needle 200 higher, thereby improving the accuracy of the opening and closing of the electronic expansion valve and the flow control.

[0073] In one embodiment, the depth of the first sub-hole 1011 is greater than the depth of the second sub-hole 1012; and / or,

[0074] The distance range of the first gap 102 is 0.05 mm to 0.1 mm; and / or,

[0075] The distance range of the second gap 103 is 0.1 mm to 0.2 mm.

[0076] In an embodiment of the present utility model, since the distance of the first gap 102 is less than or equal to the distance of the second gap 103, that is, the pressing sleeve 100 mainly guides the first valve needle 200 through the inner wall of the first sub-hole 1011, setting the depth of the first sub-hole 1011 deeper is beneficial to improving the guiding effect of the inner wall of the first sub-hole 1011 on the first valve needle 200, and further improving the positioning accuracy and repeated positioning accuracy of the first valve needle 200 during the movement process.

[0077] Refer to Figure 4 , in an embodiment of the present utility model, the distance range of the first gap 102 is 0.05 mm to 0.1 mm, for example: 0.05 mm, 0.08 mm, 0.1 mm, etc. The assembly accuracy between the first sub-hole 1011 and the first valve needle 200 is relatively high, which not only reduces the shaking and offset of the first valve needle 200 in the first sub-hole 1011, ensuring the guiding effect of the inner wall of the first sub-hole 1011 on the first valve needle 200, but also avoids excessive friction between the first valve needle 200 and the inner wall of the first sub-hole 1011, thereby ensuring the opening and closing of the electronic expansion valve and the flow control effect, and prolonging the service life of the electronic expansion valve.

[0078] Refer to Figure 5, in the embodiment of the present utility model, the distance range of the second gap 103 is 0.1 mm to 0.2 mm. For example: 0.1 mm, 0.12 mm, 0.15 mm, 0.18 mm, 0.2 mm, etc. The distance of the second gap 103 is not less than the distance of the first gap 102, which reduces the manufacturing precision requirement of the second sub-hole 1012 of the pressure sleeve 100, reduces the manufacturing difficulty of the sub-body 110, is beneficial to improving the processing efficiency, and reduces the processing cost.

[0079] In an embodiment, the sub-body 110 is provided with an installation structure for positioning the elastic reset member 600 of the electronic expansion valve.

[0080] In the embodiment of the present utility model, the pressure sleeve 100 is fixed in the installation hole 320 of the second valve needle 300. The first valve needle 200 moves within the pressure sleeve 100 to open and close the small valve port 310. The first valve needle 200 drives the pressure sleeve 100 to move in the direction away from the small valve port 310, so that the pressure sleeve 100 drives the second valve needle 300 to move to open the large valve port 410. When the first valve needle 200 moves in the direction close to the small valve port 310, the elastic reset member 600 is used to drive the second valve needle 300 to close the large valve port 410. An installation structure is provided on the sub-body 110 that composes the pressure sleeve 100 for positioning and installing the elastic reset member 600. The installation structure can adopt various forms such as grooves, protrusions, and buckles.

[0081] In an embodiment, the installation structure includes a first installation groove 113 provided on the inner wall of the assembly groove 111, and the first installation groove 113 is provided at one end of the assembly groove 111 facing the elastic reset member 600.

[0082] Refer to Figure 3 , in the embodiment of the present utility model, a first installation groove 113 is provided at one end of the assembly groove 111 of the sub-body 110 facing the elastic reset member 600. One end of the elastic reset member 600 extends into the first installation groove 113 and abuts against the pressure sleeve 100. The radial movement of the elastic reset member 600 is restricted by the inner wall of the first installation groove 113, thereby achieving the positioning function of the elastic reset member 600. The structure of the first installation groove 113 is simple, easy to process, and easy to assemble with the elastic reset member 600. The shape and size of the first installation groove 113 are correspondingly set with the elastic reset member 600, and only need to meet the functional requirements, and are not limited herein.

[0083] In an embodiment, the material of the sub-body 110 is made of a non-metallic material.

[0084] In an embodiment of the present utility model, the sub-body 110 of the compression sleeve 100 is made of a non-metallic material, such as plastic, resin, etc. On the one hand, the non-metallic material has a lower density, which can reduce the weight of the entire compression sleeve 100, and further reduce the weight of the electronic expansion valve; on the other hand, the manufacturing cost of the non-metallic material is relatively low, which helps to reduce the production cost of the entire compression sleeve 100; on the other hand, the compression sleeve 100 made of the non-metallic material is not easy to scratch the outer peripheral surface of the first valve needle 200, thereby reducing the possibility of dynamic seal failure of the first valve needle 200, further ensuring the system energy efficiency of the electronic expansion valve, and reducing the possibility of failure and damage of the electronic expansion valve.

[0085] In one embodiment, the material of the sub-body 110 is engineering plastic.

[0086] In an embodiment of the present utility model, the sub-body 110 of the compression sleeve 100 is made of engineering plastic. The engineering plastic has high rigidity, small creep, and high mechanical strength, so that the sub-body 110 of the compression sleeve 100 has good strength and stiffness, a long service life, and is not easy to be damaged; in addition, the engineering plastic has good cold resistance and heat resistance, and can be used for a long time in relatively harsh chemical and physical environments. The electronic expansion valve in this embodiment is applied to the refrigerant pipeline of an air conditioner, and the compression sleeve 100 made of engineering plastic is less affected by the environment and has a long service life; in addition, the engineering plastic has a certain self-lubricating property, which further reduces the friction between the compression sleeve 100 and the first valve needle 200, and extends the service life of the compression sleeve 100 and the first valve needle 200.

[0087] In one embodiment, the engineering plastic is polyphenylene sulfide or polyether ether ketone.

[0088] In an embodiment of the present utility model, the engineering plastic used for the sub-body 110 is PPS (Polyphenylenesulfide) or PEEK (poly-ether-ether-ketone). Among them, polyphenylene sulfide has the advantages of high temperature resistance, corrosion resistance, good thermal stability, etc., and is not easy to be damaged and thermally deformed, which is beneficial to extending the service life of the compression sleeve 100; polyether ether ketone has the advantages of high mechanical strength, high temperature resistance, impact resistance, wear resistance, fatigue resistance, etc., and is not easy to be damaged even under the movement impact of the first valve needle 200, which is beneficial to extending the service life of the compression sleeve 100.

[0089] In one embodiment, the material of the sub-body 110 includes, by weight percentage: 70% - 90% of engineering plastic and 10% - 30% of reinforcing fiber.

[0090] In an embodiment of the present utility model, the sub-body 110 is made by mixing engineering plastics and reinforcing fibers in a certain proportion. Among them, the weight proportion of engineering plastics is 70% - 90%, and the weight proportion of reinforcing fibers is 10% - 30%. For example, it includes 70% engineering plastics and 30% reinforcing fibers, 80% engineering plastics and 20% reinforcing fibers, 90% engineering plastics and 10% reinforcing fibers, etc. Engineering plastics account for a relatively large weight percentage, and reinforcing fibers account for a relatively small weight percentage, which helps to maintain the light weight and corrosion resistance of the gland 100. And adding reinforcing fibers helps to improve the mechanical strength of the gland 100, thereby improving the strength and impact resistance of the gland 100 and extending the service life of the gland 100.

[0091] In an embodiment, the reinforcing fiber is glass fiber or carbon fiber.

[0092] In an embodiment of the present utility model, glass fiber can be used as the reinforcing fiber, which has high strength, mature manufacturing process, is easy to obtain, and has low cost. Carbon fiber can also be used as the reinforcing fiber, which has high strength and is lightweight, not only improving the strength and impact resistance of the gland 100, but also not affecting the light weight of the gland 100.

[0093] Refer to Figure 6 and Figure 9 , the present utility model also proposes an electronic expansion valve, including:

[0094] The above-mentioned gland 100;

[0095] The first valve needle 200, movably passing through the assembly hole 101; and

[0096] The second valve needle 300, provided with an installation hole 320, and the gland 100 is arranged in the installation hole 320.

[0097] For the specific structure of the gland 100, refer to the above-mentioned embodiment. Since this electronic expansion valve adopts all the technical solutions of the above-mentioned all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated here one by one. Among them, the second valve needle 300 is provided with an installation hole 320, and the gland 100 is arranged in the installation hole 320. The gland 100 and the second valve needle 300 can be connected by various methods such as interference fit, bonding or clamping.

[0098] Refer to Figure 9, specifically in this embodiment, the electronic expansion valve includes a valve seat 400, a nut seat 500, an elastic reset member 600, a first valve needle 200, a second valve needle 300, and a gland 100. The valve seat 400 is provided with a valve cavity, and the valve cavity has a large valve port 410; the nut seat 500 is installed on the valve seat 400; the second valve needle 300 is arranged in the valve cavity and is used to open and close the large valve port 410. A small valve port 310 and an installation hole 320 communicating with the small valve port 310 are arranged on the second valve needle 300; the gland 100 is installed in the installation hole 320; one end of the first valve needle 200 is threadedly connected to the nut seat 500 to form a lead screw nut mechanism, and the middle part thereof passes through the assembly hole 101 of the gland 100. The other end of the first valve needle 200 is used to close and open the small valve port 310; the elastic reset member 600 is a spring, one end of which extends into the first installation groove 113 of the gland 100, and the other end of the elastic reset member 600 is connected to the nut seat 500.

[0099] When the electronic expansion valve is closed, the first valve needle 200 closes the small valve port 310 and the second valve needle 300 closes the large valve port 410. At this time, the first limit protrusion 201 on the outer peripheral wall of the first valve needle 200 abuts against the lower inner wall of the first limit groove 112 on the pressure sleeve 100; when the first valve needle 200 moves away from the small valve port 310, the first valve needle 200 opens the small valve port 310. At this time, the first valve needle 200 moves within the fitting hole 101 of the pressure sleeve 100, and the first limit protrusion 201 is located between the lower inner wall and the upper inner wall of the first limit groove 112; the first valve needle 200 continues to move away from the small valve port 310 until the first limit protrusion 201 abuts against the upper inner wall of the first limit groove 112. The first valve needle 200 will drive the pressure sleeve 100 to move, and then drive the second valve needle 300 to move away from the large valve port 410, so that the second valve needle 300 opens the large valve port 410. At this time, both the large valve port 410 and the small valve port 310 of the electronic expansion valve are opened. During this process, it is necessary to overcome the resistance of the elastic reset member 600 to drive the elastic reset member 600 to deform; when it is necessary to switch the electronic expansion valve back to the closed state, the first valve needle 200 moves towards the small valve port 310. At this time, the elastic reset member 600 tends to restore its own deformation, driving the pressure sleeve 100 to move with the first valve needle 200, and then driving the second valve needle 300 to move towards the large valve port 410. During this process, the first limit protrusion 201 still abuts against the upper inner wall of the first limit groove 112; the first valve needle 200 continues to move towards the small valve port 310, so that the second valve needle 300 closes the large valve port 410; the first valve needle 200 continues to move. At this time, the pressure sleeve 100 stops moving, and the first limit protrusion 201 separates from the upper inner wall of the first limit groove 112. The first valve needle 200 moves within the fitting hole 101 of the pressure sleeve 100; until the first valve needle 200 closes the small valve port 310 and the first limit protrusion 201 abuts against the lower inner wall of the first limit groove 112, at this time both the large valve port 410 and the small valve port 310 of the electronic expansion valve are closed.

[0100] Among them, the diameter of the large valve port 410 is larger than that of the small valve port 310, so that the flow rate of the fluid flowing out through the large valve port 410 is larger. Through the setting of the double valve needles, the electronic expansion valve can realize three states: the large valve port 410 and the small valve port 310 are both closed, only the small valve port 310 is opened, and both the large valve port 410 and the small valve port 310 are opened. And in the two cases of only opening the small valve port 310 and both the large valve port 410 and the small valve port 310 are opened, the opening degree of the valve port will also affect the flow rate, so as to realize the flow rate adjustment function of the electronic expansion valve.

[0101] In an embodiment, an end stop structure 330 is provided on the periphery of the mounting hole 320, and the end stop structure 330 prevents the pressure sleeve 100 from coming out of the mounting hole 320.

[0102] Refer to Figure 7, in the embodiment of the present utility model, a terminal stop structure 330 is provided on the periphery of the mounting hole 320 of the second valve needle 300. The terminal stop structure 330 can be realized in various forms such as flanging and clamping. By providing the terminal stop structure 330, the compression sleeve 100 is prevented from coming out of the mounting hole 320, ensuring the firmness of the assembly of the compression sleeve 100 and the second valve needle 300. Specifically in this embodiment, in combination with Figures 7 to 8 , a chamfer is provided on the periphery of the mounting hole 320, so that the wall thickness of the periphery of the mounting hole 320 is relatively thin. After the compression sleeve 100 is inserted into the mounting hole 320, the periphery of the mounting hole 320 is flanged inward to form the terminal stop structure 330, which has a simple structure and is convenient for the assembly of the compression sleeve 100.

[0103] In an embodiment, a third gap 321 is provided between the inner wall of the mounting hole 320 and the outer peripheral wall of the compression sleeve 100.

[0104] Referring to Figures 6 to 7 , in the embodiment of the present utility model, the terminal stop structure 330 is provided to prevent the compression sleeve 100 from coming out of the mounting hole 320. It can be understood that providing the third gap 321 between the inner wall of the mounting hole 320 and the outer peripheral wall of the compression sleeve 100 is beneficial to improving the convenience of inserting the compression sleeve 100 into the mounting hole 320, reducing the assembly difficulty of the compression sleeve 100 and the second valve needle 300, and improving the assembly efficiency of the electronic expansion valve.

[0105] In an embodiment, the distance range of the third gap 321 is 0.05 mm to 0.1 mm.

[0106] In the embodiment of the present utility model, the distance range of the third gap 321 is 0.05 mm to 0.1 mm, for example: 0.05 mm, 0.08 mm, 0.1 mm, etc. The assembly accuracy between the compression sleeve 100 and the mounting hole 320 is relatively high, reducing the shaking and offset of the compression sleeve 100 in the mounting hole 320, ensuring both the opening and closing accuracy and the flow control accuracy of the electronic expansion valve, and reducing the noise during the opening and closing process of the electronic expansion valve.

[0107] In an embodiment, the second valve needle 300 is further provided with a second mounting groove 340 communicating with the mounting hole 320. The electronic expansion valve further includes a sealing ring 700. The sealing ring 700 is disposed in the second mounting groove 340 and sleeved outside the first valve needle 200 to seal and connect the first valve needle 200 and the second valve needle 300, and the compression sleeve 100 blocks the sealing ring 700 from coming out of the second mounting groove 340.

[0108] In combination with Figure 6 , Figure 8 and Figure 9, in the embodiment of the present utility model, the second valve needle 300 is further provided with a second installation groove 340, and a sealing ring 700 is provided in the second sealing ring 700. The dynamic seal between the first valve needle 200 and the second valve needle 300 is achieved through the sealing ring 700, preventing fluid from flowing into the installation hole 320 from the small valve port 310, and prolonging the service life of the compression sleeve 100 and the first valve needle 200. Among them, after the compression sleeve 100 is inserted into the installation hole 320, it blocks the sealing ring 700 from coming out of the second installation groove 340, thus ensuring the sealing effect of the sealing ring 700.

[0109] The present utility model also proposes an air conditioner, including the above-mentioned electronic expansion valve. The specific structure of this electronic expansion valve refers to the above-mentioned embodiment. Since this air conditioner adopts all the technical solutions of the above-mentioned all embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated here one by one.

[0110] The above is only the exemplary embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structural transformation made by using the content of the specification and drawings of the present utility model under the technical concept of the present utility model, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. A compression sleeve, applied to an electronic expansion valve, characterized in that: The compression sleeve comprises at least two separately arranged sub-bodies, each of which is provided with an assembly groove. Along the circumference of the first valve needle of the electronic expansion valve, the sub-bodies are spliced ​​to form the compression sleeve so that the assembly grooves are spliced ​​to form an assembly hole, and the first valve needle is movably inserted into the assembly hole.

2. The compression sleeve according to claim 1, characterized in that: The pressing sleeve is formed by splicing two sub-bodies.

3. The compression sleeve according to claim 1, characterized in that: The sub-body is provided with a limiting structure, and the limiting structure is used to limit the relative movable stroke of the first valve needle relative to the pressing sleeve.

4. The compression sleeve according to claim 3, characterized in that: The limiting structure includes a first limiting groove provided on the inner wall of the assembly groove to cooperate with a first limiting protrusion provided on the outer peripheral wall of the first valve needle, and the first limiting protrusion is inserted into the first limiting groove to limit the relative movable stroke of the first valve needle relative to the pressing sleeve; or, The limiting structure includes a second limiting protrusion arranged on the inner wall of the assembly groove to cooperate with a second limiting groove corresponding to the outer peripheral wall of the first valve needle, and the second limiting protrusion is inserted into the second limiting groove to limit the relative movable stroke of the first valve needle relative to the pressing sleeve.

5. The compression sleeve according to claim 1, characterized in that: The assembly hole includes a first sub-hole and a second sub-hole that are connected. The inner diameter of the first sub-hole is larger than the inner diameter of the second sub-hole. Both the first sub-hole and the second sub-hole are clearance-matched with the first valve needle.

6. The pressing sleeve according to claim 5, characterized in that: There is a first gap between the inner wall of the first sub-hole and the outer peripheral wall of the first valve needle, and there is a second gap between the inner wall of the second sub-hole and the outer peripheral wall of the first valve needle. The distance of the first gap is less than or equal to the distance of the second gap.

7. The compression sleeve according to claim 6, characterized in that: The depth of the first sub-hole is greater than the depth of the second sub-hole; and / or, The distance range of the first gap is 0.05 mm to 0.1 mm; and / or, The distance range of the second gap is 0.1 mm to 0.2 mm.

8. The compression sleeve according to claim 1, characterized in that: The sub-body is provided with a mounting structure, and the mounting structure is used to position the elastic reset member of the electronic expansion valve.

9. The compression sleeve according to claim 8, characterized in that: The mounting structure comprises a first mounting groove arranged on the inner wall of the mounting groove, and the first mounting groove is arranged at one end of the mounting groove facing the elastic return member.

10. The compression sleeve according to claim 1, characterized in that: The sub-body is made of non-metallic material.

11. The compression sleeve according to claim 10, characterized in that: The material of the sub-body is engineering plastic.

12. The compression sleeve according to claim 11, characterized in that: The engineering plastic is polyphenylene sulfide or polyetheretherketone.

13. The compression sleeve according to claim 10, characterized in that: The material of the sub-body includes, by weight percentage, 70% to 90% of engineering plastics and 10% to 30% of reinforcing fibers.

14. The compression sleeve according to claim 13, characterized in that: The reinforcing fibers are glass fibers or carbon fibers.

15. An electronic expansion valve, characterized in that: include: The compression sleeve according to any one of claims 1 to 14; A first valve needle movably inserted into the assembly hole; and The second valve needle is provided with a mounting hole, and the pressing sleeve is arranged in the mounting hole.

16. The electronic expansion valve according to claim 15, characterized in that: An end stop structure is provided on the periphery of the mounting hole, and the end stop structure prevents the pressing sleeve from escaping from the mounting hole.

17. The electronic expansion valve according to claim 16, characterized in that: A third gap is defined between the inner wall of the mounting hole and the outer peripheral wall of the pressing sleeve.

18. The electronic expansion valve according to claim 17, characterized in that: The distance range of the third gap is 0.05 mm to 0.1 mm.

19. The electronic expansion valve according to claim 15, characterized in that: The second valve needle is also provided with a second mounting groove connected to the mounting hole. The electronic expansion valve also includes a sealing ring, which is arranged in the second mounting groove and sleeved on the outside of the first valve needle to seal the first valve needle and the second valve needle. The compression sleeve prevents the sealing ring from escaping from the second mounting groove.

20. An air conditioner, characterized in that: Comprising the electronic expansion valve as claimed in any one of claims 15 to 19.

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