CN112923070A

CN112923070A - Electronic expansion valve assembly with good noise reduction stability

Info

Publication number: CN112923070A
Application number: CN202110088804.1A
Authority: CN
Inventors: 何永水; 何泽淼; 张永涛
Original assignee: Zhejiang Hengsen Industry Group Co ltd
Current assignee: Zhejiang Hengsen Industry Group Co ltd
Priority date: 2021-01-22
Filing date: 2021-01-22
Publication date: 2021-06-08

Abstract

The invention discloses an electronic expansion valve assembly with good noise reduction stability, which relates to the technical field of electronic expansion valves and comprises an electronic expansion valve body, an A connecting pipe and a B connecting pipe, wherein the electronic expansion valve body is respectively connected with the A connecting pipe and the B connecting pipe, the electronic expansion valve body comprises a supporting seat, a shell, a shaft, a spring guide rail, a magnetic ring, a valve needle spring, a valve seat, a valve needle, a nut, a spring supporting seat, a lead screw, a stop rod, a sliding ring and a fixed seat, the nut in the electronic expansion valve body is provided with an extended lower positioning structure, and a section of volume extends from the lower part of the lead screw to. Has the following beneficial effects: (1) the noise reduction effect is good. (2) Good stability and difficult material fatigue. (3) The service life is long. (4) The assembly and disassembly are convenient, and the production efficiency of the parts is high.

Description

Electronic expansion valve assembly with good noise reduction stability

Technical Field

The invention relates to the technical field of electronic expansion valves, in particular to an electronic expansion valve assembly with good noise reduction stability.

Background

The electronic expansion valve controls the voltage or current applied to the expansion valve by using the electric signal generated by the regulated parameter, thereby achieving the purpose of regulating the liquid supply amount. The stepless variable capacity refrigerating system has wide refrigerating liquid supply regulating range and fast regulating reaction, and the traditional throttling device (such as a thermal expansion valve) is hard to be well qualified, while the electronic expansion valve can well meet the requirement. The conventional electronic expansion valve also has the disadvantages of a valve, such as serious noise, poor stability of a valve needle, easy occurrence of material fatigue, and easy loss of performance and service life of the electronic expansion valve.

Disclosure of Invention

1. Technical problem to be solved by the invention

Aiming at the technical problems of serious noise, poor valve needle stability, easy material fatigue and easy loss of the performance and service life of the electronic expansion valve, the invention provides the electronic expansion valve assembly with good noise reduction stability, which adopts a lower positioning structure of a nut, thereby not only saving raw materials, but also increasing the stability of the valve needle, reducing the space of vortex and effectively solving the problems.

2. Technical scheme

In order to solve the problems, the technical scheme provided by the invention is as follows:

an electronic expansion valve assembly with good noise reduction stability comprises an electronic expansion valve body, an A connection pipe and a B connection pipe, wherein the electronic expansion valve body is respectively connected with the A connection pipe and the B connection pipe and comprises a supporting seat, a shell, a shaft, a spring guide rail, a magnetic ring, a valve needle spring, a valve seat, a valve needle, a nut, a spring supporting seat, a lead screw, a stop rod, a sliding ring and a fixed seat; a stop rod extends out of the supporting seat, and a sliding ring matched with the spring guide rail is arranged on the stop rod; a valve needle is rotatably connected in the screw rod, the valve needle is abutted with the spring supporting seat, the valve needle is fixedly connected with the screw rod in a limiting way, a nut is connected to the outer side of the screw rod in a threaded manner, an extended lower positioning structure is arranged below the nut, and a section of volume is extended from the lower part of the screw rod to enter the space in the valve seat and is sleeved with the nut; the valve seat is fixedly connected with the shell, the shell covers the upper half part of the electronic expansion valve body, and a fixing frame is arranged outside the shell. The supporting seat is fixedly connected with the shaft through the tooth-shaped groove and the step limit, and the shaft and the spring guide rail can axially slide. The connection part of the magnetic ring and the screw rod is fixedly connected in an anti-rotation mode, and the rotation of the magnetic ring can be consistent with the rotation of the screw rod. The anti-rotation fixed connection is realized through an asymmetric connecting sleeve. The stop rod is used for preventing the valve needle and parts such as the spring guide rail from losing positions when the valve is opened, and the magnetic ring and other parts connected with the magnetic ring can prop against the lower end of the stop rod when the positions of the magnetic ring and other parts are too high, so that the limiting is realized. Therefore, the stop rod is made of soft metal such as aluminum alloy, and can provide certain buffering during stopping to protect components in the electronic expansion valve. The slip ring is used for the location, makes the structure more stable. The valve needle and the valve seat are of a sealing structure, and whether the medium circulates or not is controlled. The lower positioning structure extends out to enable the limiting length of the valve needle to be longer, so that the valve needle is more stable, and the transverse force resistance performance is stronger. After the valve needle is stable, the loss of the transmission thread on the screw rod can be reduced, meanwhile, the damage probability of the valve seat and the valve needle is greatly reduced, the material is not easy to fatigue, and therefore the service life of the electronic expansion valve is prolonged. The lower positioning structure can save the screw pitch, and if the positioning structure is arranged at one end, close to the supporting seat, of the nut, certain screw pitch can be sacrificed, so that the connection strength is ensured by prolonging the length of the nut in order to ensure the connection strength, raw materials can be saved by arranging the lower positioning structure, and the implementation of the die technology is also facilitated. The space that is the medium vortex when the original nut that does not have extension volume in the disk seat inner space damages great to needle and other parts, also makes the needle unstable easily, bad conditions such as shake appear, and lower location structure stretches into this space after the compression has reduced the space of vortex, makes the needle more stable, the damage probability greatly reduced of needle to electronic expansion valve's life has been prolonged. Most of the noise is generated by vortex and instability and shaking of moving parts in the valve, so the electronic expansion valve also has good noise reduction performance.

Optionally, the supporting seat is provided with a toothed groove matched with the shaft at a fixed connection position, a notch of the groove is provided with a step, and the supporting seat is internally provided with a hollow structure. The tooth-shaped grooves and the steps are used for limiting, and the hollow structure is used for reducing weight.

Optionally, one end of the spring supporting seat is in a ball head rivet shape, the large-diameter part is in clearance fit with the inner diameter of the screw rod, and the head part of the rivet is chamfered and removed with sharp edges; the other end is a small diameter and is in transition fit with the inner diameter of the valve needle spring, and the valve needle spring is arranged outside the small diameter. The contact surface of the bulb rivet shape is only one point, and the two parts can rotate without mutual influence. The valve needle spring is used for improving certain pre-pressure, and the valve needle is limited and not limited to be convenient to assemble and disassemble.

Optionally, the screw rod is connected with the connecting sleeve in an embedded mode through a step.

Optionally, the screw threads of the screw rod and the nut are trapezoidal transmission screw threads. Trapezoidal drive threads can carry larger loads and are commonly used for drives.

Optionally, the shaft is slidably connected to the spring guide rail, the shaft is a slide bar, and the spring guide rail is a slide way.

Optionally, the valve seat is respectively connected with a connecting pipe A and a connecting pipe B, and the connecting pipe B is a bent pipe. The medium is introduced into and flows out from the pipe A and the pipe B.

Optionally, the root of the stop rod is provided with a flange. The flange is in contact with the surface of the connection sleeve.

Optionally, the stop rod is made of aluminum alloy. The stop rod is made of soft metal such as aluminum alloy, and can provide certain buffering during stopping to protect components in the electronic expansion valve.

Optionally, the shell is provided with an inward annular protrusion, and the annular protrusion is clamped with a concave ring on the supporting seat in a matching manner. The installation of shell and supporting seat is convenient.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:

(1) the electronic expansion valve assembly that stability of making an uproar is good falls that this application embodiment provided, the noise reduction effect is good.

(2) The electronic expansion valve assembly with the noise reduction function and the good stability provided by the embodiment of the application has the advantages of good stability and difficulty in material fatigue.

(3) The electronic expansion valve assembly that stability of making an uproar is good that this application embodiment provided, long service life.

(4) The electronic expansion valve assembly that stability of making an uproar is good that this application embodiment provided, easy to assemble and dismantlement, the production efficiency of part is high.

Drawings

Fig. 1 is a schematic structural diagram of an electronic expansion valve assembly with good noise reduction stability according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a nut of an electronic expansion valve assembly with good noise reduction stability according to an embodiment of the present invention;

fig. 3 shows an open state of the electronic expansion valve assembly with good noise reduction and stability according to an embodiment of the present invention.

1. A supporting seat; 2. a housing; 3. a shaft; 4. a spring guide rail; 5. a magnetic ring; 6. a valve needle spring; 7. a valve seat; 8. a valve needle; 9. a nut; 91. a lower positioning structure; 10. a spring support seat; 11. a screw rod; 12. a stopper rod; 13. a slip ring; 14. a fixed seat; 15. a, taking over a pipe; 16. and B, taking over the tube.

Detailed Description

For a further understanding of the present invention, reference will now be made in detail to the embodiments illustrated in the drawings.

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings. The terms first, second, and the like in the present invention are provided for convenience of describing the technical solution of the present invention, and have no specific limiting effect, but are all generic terms, and do not limit the technical solution of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. The technical solutions in the same embodiment and the technical solutions in different embodiments can be arranged and combined to form a new technical solution without contradiction or conflict, and the technical solutions are within the scope of the present invention.

Examples

With reference to fig. 1-2, an electronic expansion valve assembly with good noise reduction stability comprises an electronic expansion valve body, an a connection pipe 15 and a B connection pipe 16, wherein the electronic expansion valve body is respectively connected with the a connection pipe 15 and the B connection pipe 16, the electronic expansion valve body comprises a support seat, a shell 2, a shaft, a spring guide rail 4, a magnetic ring 5, a valve needle spring 6, a valve seat 7, a valve needle 8, a nut 9, a spring support seat 10, a lead screw 11, a stop rod 12, a sliding ring 13 and a fixed seat 14, the support seat is fixedly connected with the shaft, the shaft is sleeved with the spring guide rail 4, the magnetic ring 5 which is arranged in parallel is arranged outside the spring guide rail 4, and the magnetic ring 5 is; a stop rod 12 extends out of the supporting seat, and a sliding ring 13 matched with the spring guide rail 4 is arranged on the stop rod 12; a valve needle 8 which is rotatably connected is arranged in the screw rod 11, the valve needle 8 is abutted with the spring supporting seat 10, the valve needle 8 is fixedly connected with the screw rod 11 in a limiting way, a nut 9 is connected with the outer side of the screw rod 11 in a threaded way, an extended lower positioning structure 91 is arranged below the nut 9, and a section of volume is extended from the lower part of the screw rod 11 to enter the space in the valve seat 7 and be sleeved with the nut 9; the valve seat 7 is fixedly connected with the shell 2, the shell 2 covers the upper half part of the electronic expansion valve body, and a fixing frame is arranged outside the shell 2. The supporting seat and the shaft are fixedly connected through the tooth-shaped groove and the step limit, and the shaft and the spring guide rail 4 can axially slide. The connection part of the magnetic ring 5 and the screw rod 11 is fixedly connected in an anti-rotation mode, and the rotation of the magnetic ring 5 is consistent with the rotation of the screw rod 11. The anti-rotation fixed connection is realized through an asymmetric connecting sleeve. The stop rod 12 is used for preventing the valve needle 8, the spring guide rail 4 and other parts from being out of position when the valve is opened, and the magnetic ring 5 and other parts connected with the magnetic ring can be propped against the lower end of the stop rod 12 when the positions of the magnetic ring 5 and other parts are too high, so that the limiting is realized. Therefore, the stopper rod 12 is made of a relatively soft metal such as an aluminum alloy, and can provide a certain buffer during stopping to protect the components inside the electronic expansion valve. The slip ring 13 is used for positioning, so that the structure is more stable. The valve needle 8 and the valve seat 7 are sealed structures, and the control of whether media flow or not is realized. The lower positioning structure 91 extends out to enable the limiting length of the valve needle 8 to be longer, so that the valve needle 8 is more stable, and the transverse force resistance performance is stronger. After the valve needle 8 is stable, the loss of the transmission thread on the screw rod 11 can be reduced, meanwhile, the damage probability of the valve seat 7 and the valve needle 8 is greatly reduced, the material is not easy to fatigue, and therefore the service life of the electronic expansion valve is prolonged. The shape of the screw rod 11 is in a truncated cone step shape, the small end is provided with an external thread which is meshed with the guide nut 9, the outer diameter of the middle part is in clearance fit with a stepped hole of the guide nut 9, and the excircle of the large end is matched with the connecting sleeve; the center of the screw rod 11 is provided with a stepped hole, the aperture of the small end is in clearance fit with a valve needle 8 with a retaining shoulder, the central area of the stepped hole is provided with the valve needle 8 retaining shoulder, a spring support and a valve needle spring 6, the aperture of the large end of the stepped hole is fixedly connected with a guide rail shaft, and the central area of the stepped hole is also provided with a pressure guide hole communicated with an excircle. Lower location structure 91 can save the pitch, and certain pitch can be sacrificed if this location structure sets up in being close to supporting seat direction one end of nut 9, in order to guarantee the intensity of connecting, will prolong nut 9 length and guarantee joint strength, establishes to location structure 91 can save raw materials down, also is convenient for the implementation of mould technology. The space of the medium vortex is originally not provided with the space of the nut 9 in the valve seat 7 when extending the volume, the damage to the valve needle 8 and other parts is large, the valve needle 8 is easy to be unstable, and the shaking and other adverse conditions occur, the lower positioning structure 91 is compressed after stretching into the space to reduce the space of the vortex, so that the valve needle 8 is more stable, the damage probability of the valve needle 8 is greatly reduced, and the service life of the electronic expansion valve is prolonged. Most of the noise is generated by vortex and instability and shaking of moving parts in the valve, so the electronic expansion valve also has good noise reduction performance.

The supporting seat is fixedly connected with the shaft, toothed grooves matched with each other are formed in the fixing position of the supporting seat and the shaft, steps are arranged on notches of the grooves, and a hollow structure is arranged in the supporting seat. The tooth-shaped grooves and the steps are used for limiting, and the hollow structure is used for reducing weight. One end of the spring supporting seat 10 is in a ball head rivet shape, the large-diameter part is in clearance fit with the inner diameter of the screw rod 11, and the head part of the rivet is chamfered and removed with sharp; the other end is a small diameter and is in transition fit with the inner diameter of the valve needle spring 6, and the valve needle spring 6 is arranged outside the small diameter. The contact surface of the bulb rivet shape is only one point, and the two parts can rotate without mutual influence. The valve needle spring 6 is used for improving certain pre-pressure, and limiting the valve needle 8 without being limited so as to be convenient to assemble and disassemble.

The screw rod 11 is connected with the connecting sleeve in an embedded mode through a step. The screw threads of the screw rod 11 and the nut 9 are trapezoidal transmission screw threads. Trapezoidal drive threads can carry larger loads and are commonly used for drives. The shaft is connected with the spring guide rail 4 in a sliding mode, the shaft is a sliding strip, and the spring guide rail 4 is a sliding way. The valve seat 7 is respectively connected with a connecting pipe A15 and a connecting pipe B16, and the connecting pipe B16 is a bent pipe. The medium is introduced and discharged from the connection pipe A15 and the connection pipe B16. The root of the stop rod 12 is provided with a flange. The flange is in contact with the surface of the connection sleeve.

The shell 2 is provided with an inward annular protrusion, and the annular protrusion is clamped with a concave ring on the supporting seat in a matching manner. The installation of the shell 2 and the supporting seat is convenient.

Referring to fig. 3, this is the open valve state, in which the valve needle 8 is separated from the valve seat 7.

The working principle is as follows:

the magnetic ring 5 is controlled by an electric signal generated by the regulated parameter, and a voltage or a current is applied to the expansion valve, so that the magnetic ring 5 rotates, the screw rod 11 rotates, the external thread of the screw rod 11 converts the rotation into axial movement, the axial movement of the valve needle 8 is controlled, the closing and the separation of the valve needle 8 and the valve seat 7 are controlled, and the purpose of regulating the medium flow is achieved.

The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.

Claims

1. An electronic expansion valve assembly with good noise reduction stability is characterized by comprising an electronic expansion valve body, an A connecting pipe and a B connecting pipe, wherein the electronic expansion valve body is respectively connected with the A connecting pipe and the B connecting pipe, the electronic expansion valve body comprises a supporting seat, a shell, a shaft, a spring guide rail, a magnetic ring, a valve needle spring, a valve seat, a valve needle, a nut, a spring supporting seat, a screw rod, a stop rod, a sliding ring and a fixed seat, the supporting seat is fixedly connected with the shaft, the shaft is sleeved with the spring guide rail, the outside of the spring guide rail is provided with the magnetic ring which is arranged in parallel, and the magnetic ring is; a stop rod extends out of the supporting seat, and a sliding ring matched with the spring guide rail is arranged on the stop rod; a valve needle is rotatably connected in the screw rod, the valve needle is abutted with the spring supporting seat, the valve needle is fixedly connected with the screw rod in a limiting way, a nut is connected to the outer side of the screw rod in a threaded manner, an extended lower positioning structure is arranged below the nut, and a section of volume is extended from the lower part of the screw rod to enter the space in the valve seat and is sleeved with the nut; the valve seat is fixedly connected with the shell, the shell covers the upper half part of the electronic expansion valve body, and a fixing frame is arranged outside the shell.

2. The electronic expansion valve assembly with noise reduction and good stability as claimed in claim 1, wherein the fixing portion of the supporting seat and the shaft has mutually matching toothed grooves, the notch of the groove has steps, and the supporting seat has a hollow structure.

3. The electronic expansion valve assembly with noise reduction and good stability as claimed in claim 1, wherein one end of the spring support seat is in a ball head rivet shape, the large diameter portion is in clearance fit with the inner diameter of the screw rod, and the head portion of the rivet is chamfered and sharpened; the other end is a small diameter and is in transition fit with the inner diameter of the valve needle spring, and the valve needle spring is arranged outside the small diameter.

4. The electronic expansion valve assembly with noise reduction and good stability as claimed in claim 1, wherein the lead screw is connected with the connecting sleeve by a step in an embedded manner.

5. The electronic expansion valve assembly with noise reduction and good stability as claimed in claim 4, wherein the screw threads of the screw mandrel and the nut are trapezoidal transmission screw threads.

6. The electronic expansion valve assembly with noise reduction and good stability of claim 1, wherein the shaft is slidably connected with the spring guide rail, the shaft is a slide bar, and the spring guide rail is a slide way.

7. The electronic expansion valve assembly with noise reduction and good stability according to claim 1, wherein the valve seat is connected with a connection pipe A and a connection pipe B respectively, and the connection pipe B is an elbow pipe.

8. The electronic expansion valve assembly with noise reduction and good stability as claimed in claim 1, wherein a flange is provided at a root of the stopper rod.

9. The electronic expansion valve assembly with noise reduction and good stability as claimed in any one of claims 1 to 8, wherein the stop rod is made of aluminum alloy.

10. The electronic expansion valve assembly with noise reduction and good stability as claimed in any one of claims 1 to 8, wherein the housing is provided with an inward ring protrusion, and the ring protrusion is engaged with the concave ring on the support seat.