CN220134627U - Expansion valve - Google Patents

Abstract

The utility model provides an expansion valve, and relates to the technical field of expansion valves. The expansion valve comprises a valve body, a mounting seat, a valve bead, a base and a locking piece; the valve body is internally provided with a valve cavity and an opening communicated with the valve cavity, and a part of cavity wall of the valve cavity is enclosed to form a valve port; the mounting seat can be movably mounted in the valve cavity; the valve bead can be movably arranged in the valve cavity, is positioned on one side of the mounting seat away from the opening, and is elastically connected with the mounting seat; the base is arranged at the opening of the valve body and can seal the opening, and the base is axially provided with an installation through hole along the base; the locking piece is arranged through the mounting through hole and is detachably connected with the base; when the locking piece is in a detached state, the mounting seat can axially move along the valve body under the action of external force. Through set up the installation through-hole on the mount pad and be convenient for adjust the instrument and pass the installation through-hole and adjust the mount pad, reduce adjusting bolt and nut's use, reduce consumptive material cost and installation time cost.

Description

Expansion valve

Technical Field

The utility model relates to the technical field of expansion valves, in particular to an expansion valve.

Background

The expansion valve is an important part in the refrigeration system, is generally arranged between the liquid storage cylinder and the evaporator, and adjusts the flow of the refrigerant according to the outlet pressure of the evaporator, so that the evaporator has a certain degree of superheat, and liquid refrigerant is prevented from entering the compressor to generate liquid impact. The existing expansion valve comprises an adjusting bolt, a base and a screw cap, wherein the adjusting bolt is installed in the base, and the screw cap is sleeved outside the base and connected with the base. In the process of manually adjusting the superheat degree, a nut is required to be opened, and an adjusting bolt is screwed to control the flow of the refrigerant, so that the expansion valve is more complicated in structure and higher in material and processing cost.

Disclosure of Invention

Based on this, it is necessary to provide an expansion valve that can reduce the cost.

An expansion valve comprises a valve body, a mounting seat, a valve bead, a base and a locking piece; the valve body is internally provided with a valve cavity and an opening communicated with the valve cavity, and part of the cavity wall of the valve cavity is surrounded to form a valve port; the mounting seat can be movably mounted in the valve cavity; the valve bead is movably arranged in the valve cavity, is positioned on one side of the mounting seat, which is away from the opening, and is elastically connected with the mounting seat; the base is arranged at the opening of the valve body and can seal the opening, and the base is axially provided with an installation through hole along the base; the locking piece is arranged through the mounting through hole in a penetrating mode and is detachably connected with the base; when the locking piece is in a disassembly state, the mounting seat can move axially along the valve body under the action of external force so as to push the valve bead to move relative to the valve port.

It can be understood that the size of the elastic force can be adjusted by the axial movement of the mounting seat along the valve body, the elastic force is different, and the gap between the valve bead and the valve port is also different, so that the flow of the refrigerant can be adjusted, and the superheat degree is further adjusted. Therefore, the installation through hole is formed in the base, so that the adjusting tool can conveniently pass through the installation through hole to be matched and adjusted with the installation seat. The setting of retaining member then can be when need not artifical flow control, cooperates the base to carry out the shutoff to the valve body opening, guarantees sealed effect. Through the use of adjusting bolt and nut has been reduced in the setting more for the structure of expansion valve is simple more compact, reduces consumable cost and installation time cost, realizes the lightweight design.

In one embodiment, the operation part is configured at one end of the mounting seat, which axially deviates from the valve port, and the operation part comprises a first mounting groove axially recessed along the mounting seat, the first mounting groove of the mounting seat and the mounting through hole on the base are respectively and completely overlapped along the projection of the axial direction of the valve body, and the projection area of the first mounting groove of the mounting seat along the axial direction of the valve body is smaller than or equal to the projection area of the mounting through hole of the base along the axial direction of the valve body.

It will be appreciated that the provision of the operating portion on the mounting seat facilitates adjustment of the operating portion by the adjustment tool to enable movement of the mounting seat within the valve body. The operation part is arranged as the first installation groove, so that the structure is simple and the operation is convenient. Through the setting of projection area, make adjusting tool can pass installation through-hole and first mounting groove cell wall cooperation, ensure that there is sufficient cooperation area to adjust.

In one embodiment, the mounting through hole of the base comprises a divergent section and a straight section connected with the divergent section, and the straight section is arranged close to the mounting seat; along the axial direction of the base, the inner diameter of the diverging section gradually increases from the straight section to the outside of the valve body; the locking piece is arranged on the straight section in a penetrating mode and is abutted to the diverging section.

It can be appreciated that the arrangement is convenient for the locking piece to prop against the divergent section, and the base is driven to rotate and lock so as to realize sealing.

In one embodiment, the valve cavity wall is provided with a first limiting part, the expansion valve further comprises a limiting structure, and the first limiting part and the limiting structure are arranged at intervals along the axial direction of the valve body; the outer wall of the mounting seat is provided with a first limiting protrusion outwards in the radial direction of the mounting seat, one side of the first limiting protrusion, facing the valve bead, is a first limiting surface, and one side of the first limiting protrusion, facing the base, is a second limiting surface; the first limiting part can be abutted with the first limiting surface so as to limit the movement of the mounting seat towards one side of the valve bead; the limiting structure can be abutted with the second limiting surface so as to limit the movement of the mounting seat towards one side of the base.

It can be understood that setting up first spacing portion and limit structure does benefit to spacing the mount pad, makes the elastic component can keep the compression state and can keep certain elasticity allowance again.

In one embodiment, a part of the cavity wall of the valve cavity facing one end of the base is recessed radially outwards to form a first step surface, and the first step surface is the first limiting part; and/or the end surface of the base extending into the valve cavity is the limit structure.

It can be understood that the first limiting part is arranged to be a stepped surface, the limiting structure is arranged to be a base end surface, the stepped surface is simple in structure, the base end surface is fully utilized, and the operation is simple and easy.

In one embodiment, the expansion valve further comprises an elastic piece and a fixing seat, wherein one end of the elastic piece in the axial direction of the elastic piece is connected with the fixing seat, and the other end of the elastic piece in the axial direction of the elastic piece is connected with the mounting seat; the fixing seat is provided with a central hole, the valve bead part is positioned in the central hole, and the valve bead is abutted to the edge of the central hole.

It can be understood that the elastic piece is arranged to have elastic force on the valve bead, and the size of the gap between the valve bead and the valve port can be changed by adjusting the elastic force of the elastic piece; the fixing seat is arranged to support the valve beads, so that the valve beads are promoted to move stably.

In one embodiment, the mounting seat is configured with a second mounting groove, the second mounting groove and the first mounting groove are axially opposite to each other along the valve body, and part of the elastic piece is located in the second mounting groove and is abutted to the groove bottom of the second mounting groove.

It will be appreciated that the groove wall of the second mounting groove guides the resilient member to facilitate axial movement of the resilient member along the valve body.

In one embodiment, the expansion valve further comprises a valve rod movably installed in the valve cavity, one end of the valve rod along the axial direction of the valve rod is connected with an elastic membrane, and the other end of the valve rod is in butt joint with the valve bead; and a sealing piece is arranged between the outer wall of the valve rod and the valve cavity wall, and part of the outer wall of the valve rod is tightly attached to the valve cavity wall.

It can be understood that the valve rod can move under the pressure action of the elastic membrane, so as to drive the valve bead to move, and the gap between the valve bead and the valve port is changed, so that the flow of the refrigerant is regulated. The arrangement of the sealing element promotes the sealing between the valve rod and the valve body, and prevents the leakage of fluid. The close fit of the valve body and the valve rod plays a guiding role in the movement of the valve rod.

In one embodiment, a third mounting groove recessed toward the valve body is formed in one end, which axially faces away from the valve body, of the locking piece, and the first mounting groove and/or the third mounting groove is/are arranged in a triangular shape, a quadrangular shape or a pentagonal shape in a section along the radial direction of the valve body.

It can be understood that the third mounting groove is beneficial to screwing the locking piece to realize locking; through setting up the cross-sectional shape of first mounting groove and third mounting groove, can be different from the mounting groove among the prior art, collocation specialized tool prevents to artificially adjust at will and lead to the maloperation simultaneously.

In one embodiment, the valve beads have a plurality of diameter specifications, and the valve beads with the plurality of diameter specifications are alternatively arranged in the valve cavity of the valve body; when the stroke of the valve bead along the axial direction of the valve body is the same, the gap between the valve bead and the valve port is changed along with the diameter of the valve bead.

It will be appreciated that the provision of valve beads of different diameters facilitates replacement according to the refrigeration capacity requirements to meet the actual requirements.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present utility model, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following descriptions are only some embodiments of the present utility model, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.

FIG. 1 is a schematic view of an expansion valve according to the present utility model in a lock-down state;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a schematic view of the expansion valve according to the present utility model in a non-disassembled state of the locking member;

FIG. 4 is a schematic view showing the change of the valve opening angle in the process of moving the valve beads in the expansion valve according to the present utility model;

FIG. 5 is a schematic view of the valve opening area of the expansion valve according to the present utility model for different diameter beads in the same stroke;

FIG. 6 is a graph of the valve opening area as a function of evaporation load provided by the present utility model.

Reference numerals: 100. an expansion valve; 200. a first connection pipe; 300. a second connection pipe; 400. adjusting the tool; 10. a valve body; 20. a mounting base; 30. a valve bead; 40. a base; 50. a locking member; 60. an elastic member; 70. a fixing seat; 80. a valve stem; 90. an elastic membrane; 11. a first limit part; 12. a second limit part; 21. a first mounting groove; 22. a second mounting groove; 23. the first limiting protrusion; 41. mounting through holes; 42. the second limiting bulge; 51. a third mounting groove; 71. a central bore; 101. a valve cavity; 102. an opening; 103. a valve port; 104. a first port; 105. a second port; 111. a first step surface; 121. a second step surface; 231. a first limiting surface; 232. the second limiting surface; 401. a limiting end face; 411. a divergent section; 412. a straight section; 421. and a third limiting surface.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and the like are used in the description of the present utility model for the purpose of illustration only and do not represent the only embodiment.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" on a second feature may be that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through intermedial media. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely under the second feature, or simply indicating that the first feature is less level than the second feature.

Unless defined otherwise, all technical and scientific terms used in the specification of the present utility model have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used in the description of the present utility model includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 6, the present utility model provides an expansion valve 100, wherein a valve cavity 101 and an opening 102 communicating with the valve cavity 101 are configured in a valve body 10, and a part of a cavity wall of the valve cavity 101 is surrounded by a valve port 103. A first port 104 and a second port 105 are arranged at two ends of the valve body 10 along the radial direction, the valve body 10 is connected with the first connecting pipe 200 through the first port 104, and is connected with the second connecting pipe 300 through the second port 105; along the axial direction of the valve body 10, the valve port 103 is located between the first port 104 and the second port 105. In this way, the valve body 10 can realize the circulation of the refrigerant through the first port 104 and the second port 105. Specifically, the refrigerant flows from the first connecting pipe 200 into the first port 104, into the valve chamber 101, and then flows out of the second port 105 into the second connecting pipe 300.

As shown in fig. 1 to 3, the expansion valve 100 further includes a mounting base 20, a valve bead 30, a base 40, and a locking member 50. Specifically, the mounting seat 20 is movably mounted in the valve cavity 101; the valve bead 30 is movably mounted in the valve cavity 101, and the valve bead 30 is located on the side of the mounting seat 20 facing away from the opening 102 and is elastically connected with the mounting seat 20. The base 40 is installed at the opening 102 of the valve body 10 and can seal the opening 102, and the base 40 is axially provided with an installation through hole 41 along the self axis; the locking piece 50 is arranged through the mounting through hole 41 and is detachably connected with the base 40; when the locking member 50 is in the detached state, the mounting seat 20 can move axially along the valve body 10 under the action of external force, so as to push the valve bead 30 to move relative to the valve port 103.

In this way, when the mounting seat 20 moves axially along the valve body 10, the acting force is transmitted to the valve bead 30 through the elastic connection, so that the valve bead 30 moves axially along the valve body 10 along with the change of the elastic force, and the gap between the valve bead 30 and the valve port 103 also changes accordingly. Since the refrigerant at the first port 104 enters the valve body 10, and then needs to enter the valve port 103 and then flow out of the second port 105, the gap between the valve bead 30 and the valve port 103 affects the flow rate of the refrigerant, and the flow rate of the refrigerant is regulated.

In a preferred embodiment, the mounting base 20 is configured with an operating portion at an end axially facing away from the valve port 103, and the positioning of the operating portion on the mounting base 20 can further facilitate the engagement of the adjustment tool 400 with the operating portion. Specifically, the adjusting tool 400 uses a wrench, under the actual working condition, the outer wall of the mounting seat 20 is in threaded connection with the inner wall of the valve body 10, one end of the wrench is clamped into the first mounting groove 21, and the wrench is screwed to drive the mounting seat 20 to axially move along the valve body 10.

Further, as shown in fig. 1, when the locking member 50 is in the detached state, the adjusting tool 400 can directly pass through the mounting through hole 41 to be matched with the mounting seat 20 for adjustment, and an adjusting bolt is not required to be arranged on the expansion valve 100 for adjustment, so that corresponding nuts are not required to be arranged, parts are reduced, consumable materials and mounting cost can be reduced, and light-weight design is realized. Meanwhile, as shown in fig. 3, when the locking member 50 is in a connection state with the base 40, the base 40 can be locked on the valve body 10, so that the installation opening can be blocked to prevent fluid leakage.

As shown in fig. 1 and 3, in a preferred embodiment, the operation portion includes a first mounting groove 21 recessed along the axial direction of the mounting seat 20, the first mounting groove 21 of the mounting seat 20 completely overlaps with the projection of the mounting through hole 41 on the base 40 along the axial direction of the valve body 10, and the projection area of the first mounting groove 21 of the mounting seat 20 along the axial direction of the valve body 10 is smaller than or equal to the projection area of the mounting through hole 41 of the base 40 along the axial direction of the valve body 10 (specifically, the projection area of the mounting through hole 41 at the minimum diameter). Thus, the first mounting groove 21 is provided, and the expansion valve 100 is simple in structure, convenient to be matched with the adjusting tool 400, free from influence on the external dimension of the mounting seat 20, and compact in internal installation of the expansion valve. Meanwhile, the first mounting groove 21 and the mounting through hole 41 are respectively arranged along the projection of the axial direction of the valve body 10, so that the adjusting tool 400 can smoothly penetrate through the mounting through hole 41 to fully contact and match the groove wall of the first mounting groove 21, and has enough contact area to drive the mounting seat 20 to move.

In a more preferred embodiment, the central axis of the first mounting groove 21 and the central axis of the mounting through hole 41 are coincident, so that the first mounting groove 21 and the mounting through hole 41 are opposite, so that the adjusting tool 400 can directly extend into the first mounting groove 21 after passing through the mounting through hole 41, and the adjusting tool 400 is beneficial to adjusting.

As shown in fig. 1 and 3, in a preferred embodiment, the mounting hole 41 of the base 40 includes a divergent section 411 and a straight section 412 connected to the divergent section 411, the straight section 412 being disposed adjacent to the mounting base 20; along the axial direction of the base 40, the inner diameter of the diverging section 411 gradually increases from the straight section 412 to the outside of the valve body 10; the locking member 50 is disposed through the straight section 412 and abuts against the diverging section 411. In this way, the locking member 50 is tightly attached to the diverging section 411, the locking member 50 can exert force on the base 40 through the diverging section 411, and because of the threaded connection between the outer wall of the base 40 and the cavity wall of the valve cavity 101, the locking member 50 can drive the base 40 to move towards the valve body 10, and finally the base 40 is tightly attached to the end face of the valve body 10 towards the end face of the valve body 10, which faces the base 40, so that the locking seal of the base 40 relative to the valve body 10 is realized.

Further, the locking member 50 is configured with a third mounting groove 51 recessed toward the valve body 10 along an end of the locking member 50 facing away from the valve body 10 in an axial direction, so that the adjusting tool 400 can be conveniently inserted into the third mounting groove 51 to be screwed to drive the locking member 50. In one particular embodiment, retaining member 50 may be secured using a retaining nut.

In a preferred embodiment, the first mounting groove 21 and the third mounting groove 51 are provided with triangular cross sections along the radial direction of the valve body 10, and the corresponding wrench ends are also provided with an adapted shape to facilitate the engagement with the first mounting groove 21 or the second mounting groove 22. Because generally in the production process, regular hexagon groove and spanner cooperation commonly use, so through setting up the cross-section for triangle-shaped so must use special spanner to revolve to twist, avoid personnel's maloperation, reduce the condition that non-professional carries out manual regulation to expansion valve 100. Of course, in other embodiments, the cross sections of the first mounting groove 21 and the second mounting groove 22 along the radial direction of the valve body 10 may be quadrangular or pentagonal, which is simple in structure and can achieve similar effects.

For better installation, a sealing element is further arranged between the outer wall of the base 40 and the cavity wall of the valve cavity 101 for sealing, and part of the outer wall of the valve rod is tightly attached to the cavity wall of the valve cavity, so that the sealing can be further enhanced, and fluid leakage is prevented. In some embodiments, the mounting may be provided as a sealing ring, with the respective outer wall of the base 40 being configured with a mounting groove radially recessed in itself and extending circumferentially for mounting the sealing ring for sealing effect.

As shown in fig. 1 and 3, in a preferred embodiment, the expansion valve 100 further includes an elastic member 60 and a fixing base 70, wherein one end of the elastic member 60 along its axial direction is connected to the fixing base 70, and the other end of the elastic member 60 along its axial direction is connected to the mounting base 20; the holder 70 is configured with a central bore 71, the valve bead 30 being partially located within the central bore 71, the valve bead 30 abutting at the edge of the central bore 71. In this way, the elastic member 60 can regulate and control the gap between the valve bead 30 and the valve port 103 by changing the elastic force, and the fixing seat 70 can reliably support the valve bead 30. Specifically, when the mounting seat 20 moves along the axial direction of the valve body 10 and approaches the valve bead 30, the elastic member 60 is extruded, the elastic force is transmitted to the valve bead 30 through the fixing seat 70, and the valve bead 30 is pushed, so that the valve bead 30 moves near the valve port 103, the gap between the valve bead 30 and the valve port 103 can be reduced, and the flow rate of the refrigerant is reduced; when the mount 20 moves away from the valve bead 30 in the axial direction of the valve body 10, the pressing force of the elastic member 60 decreases, and the gap between the valve bead 30 and the valve port 103 can be increased, thereby increasing the flow rate of the refrigerant. In some embodiments, the spring 60 is a spring, which is simple to install and easy to operate.

As shown in fig. 1 and 2, in a preferred embodiment, the valve cavity 101 has a cavity wall configured with a first limiting portion 11, and the expansion valve 100 further includes a limiting structure, and the two limiting structures are arranged at intervals along the axial direction of the valve body 10; the outer wall of the mounting seat 20 is radially outwards convexly provided with a first limiting protrusion 23, one side of the first limiting protrusion 23 facing the valve bead 30 is a first limiting surface 231, and one side facing the base 40 is a second limiting surface 232; the first limiting part 11 can abut against the first limiting surface 231 to limit the movement of the mounting seat 20 toward the valve bead 30; the limiting structure can abut against the second limiting surface 232 to limit the movement of the mounting base 20 towards the base 40.

So set up, mount pad 20 can be in order to carry out the regulation of refrigerating output between first spacing portion 11 and limit structure back and forth. Specifically, the distance that the first limiting portion 11 abuts against the first limiting surface 231 and can limit the movement of the mounting seat 20 towards the valve bead 30 is set, and the elastic member 60 is set between the mounting seat 20 and the valve bead 30, so that the compression amount of the elastic member 60 by the mounting seat 20 can be limited, the elastic member 60 can maintain a certain elastic allowance, and the elastic member 60 is prevented from being completely compressed and the superheat degree cannot be adjusted. The distance that the mounting seat 20 can be limited to the base 40 by setting the abutting of the limiting structure and the second limiting surface 232 can avoid that the elastic piece 60 is reset or stretched to have no acting force on the valve bead 30 or generate reaction force on the valve bead 30, so as to ensure the normal adjustment of the flow of the refrigerant.

As shown in fig. 1 and 2, further, a part of the cavity wall of the valve cavity 101 facing one end of the base 40 is recessed radially outwards to form a first step surface 111, and the first step surface 111 is a first limiting portion 11; the end surface of the base 40 extending into the valve cavity 101 is a limiting structure. That is, the end surface of the base 40 extending into the valve chamber 101 may serve as a limiting end surface 401 for limiting the mount 20. In this way, the mount 20 can move back and forth between the first stepped surface 111 and the stopper end surface 401. The first step surface 111 abuts against the first limiting surface 231, so that the contact area between the cavity wall of the valve body 10 and the mounting seat 20 is large, and an effective limiting effect can be achieved. The setting of spacing terminal surface 401 has fully utilized base 40 structure, need not to additionally set up the locating part in valve pocket 101, and simultaneously, spacing terminal surface 401 and the butt of second spacing face 232, area of contact is great, also can play the effect of effective spacing.

In a preferred embodiment, the cavity wall of the valve cavity 101 is further provided with a second limiting part 12, and a part of the cavity wall of the valve cavity 101 facing one end of the base 40 is recessed radially outwards to form a second step surface 121, wherein the second step surface 121 is the second limiting part 12; the outer wall of the base 40 is radially outwards convexly provided with a second limiting protrusion 42, one side of the second limiting protrusion 42 facing the valve bead 30 is provided with a third limiting surface 421, and the third limiting surface 421 is abutted with the second step surface 121. By the arrangement, the base 40 can be better positioned, the contact area with the base 40 is increased, and the stability of the installation of the base 40 is enhanced.

As shown in fig. 1 and 3, in a preferred embodiment, the mounting base 20 is configured with a second mounting groove 22, the second mounting groove 22 and the first mounting groove 21 are disposed opposite to each other along the axial direction of the valve body 10, and a part of the elastic member 60 is located in the second mounting groove 22 and abuts against the groove bottom of the second mounting groove 22. In this way, the groove wall of the second mounting groove 22 has a limiting effect on the elastic element 60 along the radial direction of the valve body 10, so that the elastic element 60 moves along the axial direction of the valve body 10, the elastic force is ensured to be transferred along the axial direction of the valve body 10, and the adjustment of the valve bead 30 is more stable.

As shown in fig. 1 and 3, in some embodiments, the expansion valve 100 further includes a valve rod 80 movably installed in the valve cavity 101, one end of the valve rod 80 along the axial direction thereof is connected with an elastic membrane 90, and the other end is abutted against the valve bead 30; a sealing element is arranged between the outer wall of the valve rod 80 and the cavity wall of the valve cavity 101, and part of the outer wall of the valve rod 80 is tightly attached to the cavity wall of the valve cavity 101. In this way, the elastic membrane 90 can deform according to the pressure of the evaporator outlet, so as to push the valve rod 80 to move. When the outlet pressure of the evaporator is increased, the deformation of the elastic diaphragm 90 is increased, the valve rod 80 is pushed to axially move along the valve body 10, the valve rod 80 pushes the valve bead 30 to move away from the valve port 103, the gap between the valve bead 30 and the valve port 103 is increased, and the flow rate of the refrigerant is increased; when the outlet pressure of the evaporator is reduced, the deformation of the elastic diaphragm 90 is reduced, the valve bead 30 pushes the valve rod 80 to move toward the elastic diaphragm 90 under the action of the elastic member 60, the gap between the valve bead 30 and the valve port 103 is reduced, and the refrigerant flow is reduced. Besides, the sealing effect between the valve rod 80 and the valve body 10 can be enhanced by the arrangement of the sealing element, the refrigerant is prevented from flowing out of a gap between the valve rod 80 and the valve body 10, and the valve rod 80 and the valve body 10 are tightly attached to each other and can also have a guiding effect on the movement of the valve rod 80, so that the valve rod 80 moves along the axial direction of the valve body 10. In some embodiments, the seal may be provided as a seal ring, and accordingly, the outer wall of the valve stem 80 is configured with a seal groove recessed radially and extending circumferentially therealong to mount the seal ring for sealing.

As shown in fig. 5, in a preferred embodiment, the valve bead 30 has a plurality of diameter specifications, and the valve bead 30 of the plurality of diameter specifications is alternatively installed in the valve chamber 101 of the valve body 10; when the stroke of the valve bead 30 in the axial direction of the valve body 10 is the same, the gap between the valve bead 30 and the valve port 103 varies with the diameter of the valve bead 30. It should be noted that, one expansion valve 100 is provided with a corresponding valve bead 30, and the valve bead 30 has various diameter specifications, which indicates that when actually installed, the valve bead 30 with different diameters can be replaced according to the requirement of the actual refrigerating capacity, so as to increase the adjustment range of the superheat degree. Specifically, as shown in the figure, when Φ2 > Φ1 (Φ represents the diameter of the valve bead 30), h1=h2 (h represents the axial stroke of the valve bead 30 along the valve body 10), the valve opening 102 corresponding to the valve bead 30 with the diameter Φ2 has a large area, i.e. the opening of the valve port 103 is large, and the gap between the corresponding valve bead 30 and the valve port 103 is large. That is, a larger diameter valve bead 30 will have a larger opening 102 area to meet a larger flow demand for the same stroke.

In addition, the valve bead 30 and the valve rod 80 are separated, so that the valve rod 80 of a general type can be selected, and the production cost is reduced. Meanwhile, at the stage when the evaporation pressure just starts to increase, when the refrigerant passes through the valve port 103, as shown in fig. 4 and 6, the valve α is opened ₂ ＞α ₁ (α represents the valve opening angle), the valve opening flow rate increases as the valve opening 103 becomes larger. Since the curvature of the valve bead 30 is small, the valve opening area corresponding to the valve bead 30 is small in magnitude, and the occurrence of hunting in the micro opening area of the expansion valve 100 and the refrigeration cycle can be alleviated, as compared with the integral valve stem 80 in which the end portion at the valve port 103 is tapered (the clearance between the tapered end portion and the valve port 103 is used for the circulation of the refrigerant, that is, the tapered end portion functions as the valve bead 30). Meanwhile, as shown in fig. 6, the load can be driven by the small valve opening area, and the effect of quickly opening the valve in place can be realized. When the evaporating pressure is raised to a certain value, the valve opening area is rapidly increased, and the flow of the refrigerant is increased so as to meet the evaporating requirement.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of the utility model should be determined from the following claims.

Claims (10)

1. An expansion valve, comprising:

the valve body is internally provided with a valve cavity and an opening communicated with the valve cavity, and part of the cavity wall of the valve cavity is surrounded to form a valve port;

the mounting seat can be movably mounted in the valve cavity;

the valve bead is movably arranged in the valve cavity, is positioned on one side of the mounting seat away from the opening, and is elastically connected with the mounting seat;

the base is arranged at the opening of the valve body and can seal the opening, and the base is axially provided with an installation through hole along the self axis;

the locking piece is penetrated through the mounting through hole and detachably connected with the base;

when the locking piece is in a disassembly state, the mounting seat can move axially along the valve body under the action of external force so as to push the valve bead to move relative to the valve port.

2. The expansion valve of claim 1, wherein the mounting seat has an operating portion configured at an end axially facing away from the valve port, the operating portion includes a first mounting groove recessed axially along the mounting seat, the first mounting groove of the mounting seat completely overlaps with a projection of the mounting through hole on the base in the axial direction of the valve body, and a projection area of the first mounting groove of the mounting seat in the axial direction of the valve body is smaller than or equal to a projection area of the mounting through hole of the base in the axial direction of the valve body.

3. The expansion valve of claim 2, wherein the mounting through-hole of the base includes a diverging section and a straight section connected to the diverging section, the straight section being disposed proximate the mounting seat; along the axial direction of the base, the inner diameter of the diverging section gradually increases from the straight section to the outside of the valve body;

the locking piece is arranged on the straight section in a penetrating mode and is abutted to the diverging section.

4. The expansion valve of claim 3, wherein the valve chamber wall is configured with a first limit, the expansion valve further comprising a limit structure, the first limit and the limit structure being spaced apart along an axial direction of the valve body;

the outer wall of the mounting seat is provided with a first limiting protrusion outwards in the radial direction of the mounting seat, one side of the first limiting protrusion, facing the valve bead, is a first limiting surface, and one side of the first limiting protrusion, facing the base, is a second limiting surface;

the first limiting part can be abutted with the first limiting surface so as to limit the movement of the mounting seat towards one side of the valve bead; the limiting structure can be abutted with the second limiting surface so as to limit the movement of the mounting seat towards one side of the base.

5. The expansion valve of claim 4, wherein a portion of the cavity wall of the valve cavity facing one end of the base is recessed radially outwardly to form a first stepped surface, the first stepped surface being the first stop portion; and/or the number of the groups of groups,

the end face of the base extending into the valve cavity is of the limiting structure.

6. The expansion valve according to any one of claims 2 to 5, further comprising an elastic member and a fixed seat, wherein one end of the elastic member in the self axial direction is connected to the fixed seat, and the other end of the elastic member in the self axial direction is connected to the mount;

the fixing seat is provided with a central hole, the valve bead part is positioned in the central hole, and the valve bead is abutted to the edge of the central hole.

7. The expansion valve of claim 6, wherein the mounting base is configured with a second mounting groove disposed axially opposite the first mounting groove, and wherein a portion of the resilient member is disposed in the second mounting groove and abuts a groove bottom of the second mounting groove.

8. The expansion valve according to claim 7, further comprising a valve rod movably mounted in the valve cavity, wherein one end of the valve rod in the axial direction thereof is connected with an elastic membrane, and the other end of the valve rod is abutted against the valve bead;

and a sealing piece is arranged between the outer wall of the valve rod and the valve cavity wall, and part of the outer wall of the valve rod is tightly attached to the valve cavity wall.

9. Expansion valve according to claim 2, characterized in that the locking element is provided with a third mounting groove recessed towards the valve body at an end facing away from the valve body in the axial direction of the locking element, and that the first mounting groove and/or the third mounting groove is/are provided with a triangular, quadrangular or pentagonal cross section in the radial direction of the valve body.

10. The expansion valve of claim 1, wherein said valve bead has a plurality of diameter gauges, said valve bead of a plurality of diameter gauges being alternatively mounted within a valve cavity of said valve body;

when the strokes of the valve beads along the axial direction of the valve body are the same, the gap between the valve beads and the valve ports changes along with the diameter change of the valve beads.