JP2023035813A - electronic expansion valve - Google Patents

Abstract

To provide an electronic expansion valve relating to a technical field of air conditioning cooling, in particular, the electronic expansion valve in which a fitting portion is fitted to a nut seat as a connection sleeve includes the fitting portion, thus, not only connection strength between the connection sleeve and the nut seat is enhanced but also a contact area in mounting the connection sleeve and the valve seat is increased, and further connection strength among the nut seat, the connection sleeve and the valve seat, and vertical strength in mounting, are enhanced in comparison with a conventional technology.SOLUTION: In an electronic expansion valve including a valve seat, a nut seat and a connection sleeve in a manner that the nut seat is inserted to the connection sleeve, and the nut seat and the connection sleeve are mounted in the valve seat, the connection sleeve includes a main body portion and a fitting portion connected to each other, the main body portion is disposed in a state of surrounding the nut seat, and the fitting portion is inserted to the connection sleeve along the nut seat and fitted to the nut seat.SELECTED DRAWING: Figure 1

Description

The present invention relates to the technical field of air conditioning cooling, and more particularly to electronic expansion valves.

With the spread of inverter air conditioners, the performance of electronic expansion valves as a main component of inverter air conditioners has a great influence on the comfort and energy efficiency of air conditioning.

Since the connecting area between the connecting sleeve and the nut seat in the conventional electronic expansion valve is small, the connecting strength between the nut seat, the connecting sleeve and the valve seat is greatly reduced.

In view of the above, the present invention provides an electronic expansion valve that can improve the connection strength between the nut seat, the connecting sleeve and the valve seat.

In order to solve the above technical problems, the present invention provides the following technical aspects.

An electronic expansion valve comprising a valve seat, a nut seat and a connecting sleeve, wherein the nut seat is inserted into the connecting sleeve, the nut seat and the connecting sleeve are mounted within the valve seat, and wherein the connecting sleeve is a body portion connected to each other. and a fitting portion, the body portion is provided surrounding the nut seat, and the fitting portion is inserted into the connecting sleeve according to the nut seat and fitted into the nut seat.

The present application not only strengthens the connection strength between the connecting sleeve and the nut seat by including the fitting portion in the connecting sleeve so that the fitting portion is fitted into the nut seat, but also the connecting sleeve and the valve seat. It can be seen that the contact area when installing the valve is also increased, and the connection strength and verticality of installation between the nut seat, the connecting sleeve and the valve seat are further strengthened.

In one embodiment, one end of the main body is provided with an opening for mounting the nut seat, the fitting part is located at one end of the main body remote from the opening, the fitting part has an annular shape, and the fitting part has an annular shape. has a first connecting hole, one end of the nut seat is inserted into the opening, and the connecting sleeve is passed through the first connecting hole.

By drilling the first connection hole for the nut seat to be drilled and connected to the fitting part, not only the contact area between the connection sleeve and the nut seat is increased, but also the connection sleeve and the valve seat It can be seen that the contact area between the nut seat, the connecting sleeve and the valve seat has been increased as well to enhance the connection strength and mounting perpendicularity between the nut seat, the connecting sleeve and the valve seat.

In one embodiment, the fitting portion is further provided with a second connection hole, and the second connection hole and the first connection hole communicate with each other.

By drilling a second connection hole communicating with the first connection hole in the fitting portion, the contact area between the nut seat and the connection sleeve is further increased, and the connection between the nut seat and the connection sleeve is improved. It can be understood that the strength was further strengthened.

In one embodiment, the fitting portion is a plurality of convex ribs, and the plurality of convex ribs are circumferentially spaced from the inner wall of the body portion.

A plurality of convex ribs are provided on the inner wall of the main body at intervals in the circumferential direction to increase the contact area between the nut seat and the connecting sleeve, and further to increase the contact area between the nut seat and the connecting sleeve. It can be understood that the connection strength has been strengthened.

In one embodiment, the nut seat includes a mounting segment and a guide segment connected together, the guide segment being located at one end relatively close to the valve seat, the mounting segment abutting the connecting sleeve, and one end of the guide segment. protrudes from the first connecting hole, the hole diameter of the first connecting hole being smaller than the outer diameter of the guide segment.

By making the hole diameter of the first connection hole smaller than the maximum diameter of the guide segment, the depth of fitting between the nut seat and the connection sleeve is increased, and the connection strength between the nut seat and the connection sleeve is strengthened. I can understand that.

In one embodiment, the inner wall of the body portion is provided with threaded segments, the threaded segments circumferentially surrounding the inner wall of the body portion.

It can be seen that the provision of the threaded segments on the inner wall of the body part has enhanced the strength of the injection molded connection between the nut seat and the connecting sleeve.

In one embodiment, the hardness of the connecting sleeve is greater than the hardness of the nut seat and/or the hardness of the connecting sleeve is greater than or equal to the hardness of the valve seat.

By making the hardness of the connecting sleeve greater than the hardness of the nut seat, it can be seen that the connecting sleeve protects the integrity of the nut seat and improves the reliability of the threads of the nut seat.

In one embodiment, the connecting sleeve is a powder metallurgy material, stainless steel material or copper material.

In one embodiment, the inner wall of the connecting sleeve is pierced with a notch, the notch is located at one end of the connecting sleeve remote from the valve seat, the nut seat is provided with a balancing hole, and the The notches and the balancing holes communicate with each other.

It can be seen that the inner wall of the connecting sleeve is drilled with a notch communicating with the balancing hole to balance the medium pressure in the electronic expansion valve.

In one embodiment, the outer wall of the connecting sleeve is provided with a rotation stop, the connection sleeve is mounted in the valve seat, the rotation stop is engaged with the valve seat, and positions the connection sleeve in the circumferential direction. can be done.

It can be appreciated that providing a rotation stop on the outer wall of the connecting sleeve enhances the strength of the connection between the connecting sleeve and the valve seat.

Compared with the prior art, the present application only needs to include the fitting part in the connecting sleeve so that the fitting part is fitted into the nut seat to strengthen the connection strength between the connecting sleeve and the nut seat. In addition, the contact area between the connecting sleeve and the valve seat is increased to further enhance the connection strength and verticality of installation between the nut seat, the connecting sleeve and the valve seat.

1 is a structural schematic diagram of an electronic expansion valve provided in the present invention; FIG. FIG. 4 is a structural schematic diagram of the assembly of the nut seat and connecting sleeve provided in the present invention; 1 is a structural schematic diagram of a connecting sleeve in one embodiment provided in the present invention; FIG. FIG. 3 is a top structural schematic diagram of a connecting sleeve in one embodiment provided in the present invention; 1 is a structural schematic diagram of a connecting sleeve in one embodiment provided in the present invention; FIG. FIG. 3 is a top structural schematic diagram of a connecting sleeve in one embodiment provided in the present invention;

Reference numerals in the drawings are as follows.
100 electronic expansion valve, 10 valve seat, 20 nut seat, 21 mounting segment, 22 guide segment, 23 balancing hole, 30 connecting sleeve, 31 body, 311 aperture, 312 threaded segment, 313 notch, 314 mounting chamber, 32 fitting part, 321 first connecting hole, 322 second connecting hole, 33 rotation stop part, 331 included angle segment, 40 spindle, 50 valve sleeve, 60 rotor, 70 screw.

In order to make the objects, technical aspects and advantages of the present invention clearer, the present invention will be described in more detail below with reference to the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for the purpose of interpreting the present invention and do not limit the protection scope of the present invention.

It should be noted that when an assembly is said to be "attached" to another assembly, it may be attached directly to the other assembly or there may be intervening assemblies. When an assembly is considered to be "provided" in another assembly, it may be provided directly in the other assembly or there may be intervening assemblies at the same time. When an assembly is considered to be "fixed" to another assembly, it may be fixed directly to the other assembly or there may be intervening assemblies at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for the purpose of description and do not represent the only embodiments.

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

1 to 6, the present invention is applied to an air conditioning system and uses electrical signals generated by the parameters to be adjusted to control the voltage or current applied to the electronic expansion valve 100, and An electronic expansion valve 100 is provided that achieves the purpose of adjusting the amount of liquid supplied.

Since the connecting area between the connecting sleeve and the nut seat in the conventional electronic expansion valve is small, the connecting strength between the nut seat, the connecting sleeve and the valve seat is greatly reduced.

The purpose is to solve the problem of low connection strength between the nut seat, the connecting sleeve and the valve seat of the conventional electronic expansion valve. The electronic expansion valve 100 provided in the present invention includes a valve seat 10, a nut seat 20 and a connecting sleeve 30, the nut seat 20 is inserted into the connecting sleeve 30, and the nut seat 20 and the connecting sleeve 30 are attached to the valve seat 10. Mounted, the connecting sleeve 30 includes a body portion 31 and a fitting portion 32 that are connected to each other, the body portion 31 being provided surrounding the nut seat 20 , and the fitting portion 32 being inserted into the connecting sleeve 30 along the nut seat 20 . is fitted into the nut seat 20.

The present application includes a fitting portion 32 in the connecting sleeve 30 so that the fitting portion 32 fits into the nut seat 20 to not only strengthen the connection strength between the connecting sleeve 30 and the nut seat 20. , the contact area between the connecting sleeve 30 and the valve seat 10 is also increased to further enhance the connection strength and verticality of mounting between the nut seat 20 , the connecting sleeve 30 and the valve seat 10 .

As shown in FIGS. 1 and 2, the electronic expansion valve 100 further includes a spindle 40 inserted into the nut seat 20. As shown in FIG. The spindle 40 is movable relative to the nut seat 20 along the axis of the valve seat 10 to provide flow regulation to the electronic expansion valve 100 .

In this embodiment, the nut seat 20 is made of engineering plastics, which not only reduces the weight of the nut seat 20, but also can be molded by injection molding. Quality can be ensured. Preferably, the nut seat 20 is made of PPS (Phenylenesulfide), which has self-lubricating properties and reduces wear between the spindle 40 and the nut seat 20. can be avoided. Of course, in another embodiment, the nut seat 20 may be processed by adopting materials such as powder metallurgy, and is not limited here.

It should be noted that the nut seat 20, which is machined using a metal material, requires a large amount of cutting and the machining quality of the internal thread is unstable. The nut seat 20 is made of engineering plastic, which is softer than metal. A connection sleeve 30 is provided between 20 and the valve seat 10, the arrangement of the connection sleeve 30 protects the integrity of the nut seat 20, and sufficiently stabilizes the processing quality of the internal thread to ensure product quality. rice field.

In this embodiment, the hardness of the connecting sleeve 30 is greater than the hardness of the nut seat 20 and/or the hardness of the connecting sleeve 30 is greater than or equal to the hardness of the valve seat 10 . By making the hardness of the connecting sleeve 30 greater than that of the nut seat 20, the integrity of the nut seat 20 is protected by the connecting sleeve 30, improving the thread reliability of the nut seat. By making the hardness of the connecting sleeve 30 equal to or greater than the hardness of the valve seat 10, it is ensured that when the connecting sleeve 30 is pressed into the valve seat 10, very little or almost no deformation occurs.

Preferably, the valve seat 10 is a brass alloy or stainless steel to allow constant deformation to protect the size stability of the internal insert material.

Preferably, the connecting sleeve 30 is a powder metallurgical material, a stainless material or a copper material.

Further, one end of the body portion 31 is provided with an opening 311 for attaching the nut seat 20 , and the fitting portion 32 is positioned at one end of the body portion 31 away from the opening 311 . The body portion 31 is substantially hollow inside and has a columnar shape with both ends penetrating. do. Of course, the body portion 31 is not limited to being cylindrical, and in other embodiments, the body portion 31 may have other shapes and is not limited herein.

Specifically, the connecting sleeve 30 is put into an injection mold, and the nut seat 20 is injection molded. Located in the chamber 314 , the other portion protrudes from the fitting 32 . In this way, injection molding between the nut seat 20 and the connecting sleeve 30 can be achieved, and then the injection-molded nut seat 20 and the connecting sleeve 30 can be released from the mold integrally.

Furthermore, the outer wall of the connection sleeve 30 is provided with a rotation stopper 33 . The connecting sleeve 30 is attached to the valve seat 10 and the rotation stop 33 is engaged with the valve seat 10 to position the connecting sleeve 30 in the circumferential direction. Normally, the connecting sleeve 30, which has a substantially cylindrical shape, is likely to rotate with respect to the valve seat 10 during the process of assembling with the valve seat 10, thus affecting the assembling effect between the connecting sleeve 30 and the valve seat 10. Therefore, it is necessary to dispose a rotation stopper 33 on the outer wall surface of the connecting sleeve 30 to prevent the connecting sleeve 30 from rotating with respect to the valve seat 10 . Enhance connection strength and mounting perpendicularity.

Specifically, the rotation stopper 33 is a flat surface or an arcuate surface provided on the outer wall of the connection sleeve 30 . It is to avoid concentricity with the arc surface of the outer wall surface and avoid overlap with the arc surface of the outer wall surface of the connecting sleeve 30 . If the anti-rotation part 33 is a flat surface or an arc surface provided on the outer wall of the connecting sleeve 30 , an included angle segment 331 is formed between the anti-rotation part 33 and the outer wall surface of the connecting sleeve 30 so that the connecting sleeve 30 is rotated with respect to the valve seat 10 , the included angle segment 331 abuts against the valve seat 10 to form a positioning, which has the effect of preventing the connecting sleeve 30 from rotating with respect to the valve seat 10 .

Furthermore, a first connection hole 321 is formed in the fitting portion 32 . Nut seat 20 includes a mounting segment 21 and a guide segment 22 that are connected to each other. The guide segment 22 is located at one end relatively close to the valve seat 10 , the mounting segment 21 is located within the mounting chamber 314 , and the guide segment 22 protrudes from the first connecting hole 321 .

It should be noted that the contact area between the connection sleeve 30 and the nut seat 20 is reduced by drilling the first connection hole 321 through which the nut seat 20 is drilled and connected to the fitting portion 32 . In addition to increasing the contact area between the connecting sleeve 30 and the valve seat 10 as well, the connection strength between the three of the nut seat 20, the connecting sleeve 30 and the valve seat 10 and the verticality of the mounting are increased. and strengthened.

As shown in FIGS. 3 and 4, in one embodiment, the inset 32 has an annular shape. At this time, along the axial cross section of the connecting sleeve 30, the cross section of the connecting sleeve 30 exhibits an "L" shape, the long side of the "L" shape is the main body portion 31, and the short side of the "L" shape is It is an annular fitting portion 32 . Compared with the connecting sleeve 30 having an "I" cross section, the "L" type connecting sleeve 30 has an increased structure of the fitting portion 32, and this increase in structure increases the contact area between the connecting sleeve 30 and the nut seat 20. not only increase the contact area between the connecting sleeve 30 and the valve seat 10, but also increase the contact area between the nut seat 20, the connecting sleeve 30 and the valve seat 10. The connection strength between and the verticality of installation are further enhanced.

Furthermore, a threaded segment 312 is provided on the inner wall of the body portion 31 . The threaded segment 312 is provided to surround the inner wall of the body portion 31 along the circumferential direction, and the threaded segment 312 and the body portion 31 are provided coaxially. When the connecting sleeve 30 is injection molded to the nut seat 20 , the thread segment 312 can increase the engagement area so that the connecting sleeve 30 is more stably connected to the nut seat 20 .

It should be mentioned that the inner wall of the body part 31 is not limited to the arrangement of the threaded segments 312, but it is also possible to arrange other structures such as annular grooves, if the connecting sleeve 30 is injection molded into the nut seat 20. , the connection sleeve 30 can be more stably connected to the nut seat 20 by increasing the area of engagement between the nut seat 20 and the connection sleeve 30, and is not limited here.

Furthermore, when the nut seat 20 and the connecting sleeve 30 are integrally injection molded and then assembled to the valve seat 10 , the hole diameter of the first connecting hole 321 is smaller than the outer diameter of the guide segment 22 . The reason why the hole diameter of the first connection hole 321 is smaller than the outer diameter of the guide segment 22 is that the fitting portion 32 is already fitted into the nut seat 20 and a stronger connection is formed with the nut seat 20. , thereby greatly improving the connection strength between the nut seat 20 and the connection sleeve 30 and the perpendicularity of installation.

As shown in FIGS. 5 and 6, in one embodiment, the fitting portion 32 is further provided with a second connecting hole 322 . The second connection hole 322 and the first connection hole 321 communicate with each other. The second connecting hole 322 has a strip shape, and the length of the second connecting hole 322 is greater than the hole diameter of the first connecting hole 321, so that when the nut seat 20 is injection molded on the connecting sleeve 30, the connection The contact area between the sleeve 30 and the nut seat 20 is further increased, and the connection strength and mounting perpendicularity between the nut seat 20 and the connecting sleeve 30 are further enhanced.

Of course, the second connection hole 322 is not limited to the strip shape, and may be set to other shapes such as circles, triangles, and the like. It is sufficient if the contact area between the seat 20 and the connecting sleeve 30 can be further increased, and is not limited here.

In one embodiment, the fitting portion 32 is a plurality of convex ribs, and the plurality of convex ribs are circumferentially spaced from the inner wall of the body portion 31 . Of course, if the fitting portion 32 is a plurality of convex ribs, the cross-section of the connecting sleeve 30 still exhibits an "L" shape when cut in the axial direction of the connecting sleeve 30 . In addition, since the plurality of convex ribs are provided at intervals, when the nut seat 20 is injection molded on the connecting sleeve 30, the gap between the convex ribs further increases the contact area between the nut seat 20 and the connecting sleeve 30. , further enhancing the connection strength between the nut seat 20 and the connection sleeve 30 and the verticality of the installation.

Of course, in other embodiments, the fitting part 32 may have other structures, as long as the contact area between the nut seat 20 and the connecting sleeve 30 can be increased.

Furthermore, a notch 313 is formed in the body portion 31 . The notch 313 is located at one end of the connecting sleeve 30 close to the opening 311, the nut seat 20 is provided with the balancing hole 23, and the notch 313 and the balancing hole 23 communicate with each other. A notch 313 communicating with the balancing hole 23 is drilled in the inner wall of the connecting sleeve 30 to balance the medium pressure in the electronic expansion valve 100 .

In the electronic expansion valve 100, the connecting sleeve 30 in this embodiment is injection molded on the outer wall of the nut seat 20 for easy mounting. First, a simple metal connection sleeve 30 is processed, and then the nut seat 20 made of PPS material and the metal connection sleeve 30 are integrally injection-molded, and then press-fitted into the valve seat 10 and fixed. However, the stress during press fit is in the metal connecting sleeve 30 .

The electronic expansion valve 100 further includes a valve sleeve 50, a rotor 60, a screw 70 and a coil (not shown), the rotor 60 being connected to the nut seat 20, the valve sleeve 50 being fitted outside the nut seat 20 and It is solder-welded to the valve seat 10, the screw 70 is provided in the nut seat 20 and is screwed into the nut seat 20, the screw 70 is rotationally connected to the spindle 40, the coil is provided outside the valve sleeve 50, and is connected to the coil. When energized, the rotor 60 can be driven to rotate, and the rotor 60 rotates the screw 70 in conjunction with the nut seat 20. Since the nut seat 20 is positioned by the valve seat 10, the nut seat 20 does not rotate. 70 is driven to move along the axial direction, and further the spindle 40 is driven to move the nut seat 20 along the axial direction.

Each technical feature in the above embodiments may be combined arbitrarily, and for the sake of brevity, not all possible combinations of each technical feature in the above embodiments are described, but the combination of these technical features is inconsistent. Unless otherwise stated, all should be considered within the ranges described herein.

The above examples merely represent some embodiments of the invention, and while the description is specific and detailed, they should not be taken as limiting the scope of the invention. It should be pointed out that for those skilled in the art, several further variations and improvements can be made without departing from the spirit of the present invention, which all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims (10)

comprising a valve seat (10), a nut seat (20) and a connection sleeve (30), said nut seat (20) being inserted into said connection sleeve (30), said nut seat (20) and said connection sleeve (30) ) is an electronic expansion valve mounted on said valve seat (10),
The connection sleeve (30) includes a body portion (31) and a fitting portion (32) which are connected to each other, the body portion (31) is provided surrounding the nut seat (20), and the fitting portion (32) is provided to surround the nut seat (20). ) is an electronic expansion valve inserted into the connection sleeve (30) according to the nut seat (20) and fitted into the nut seat (20). An opening (311) for mounting the nut seat (20) is bored in one end of the main body (31), and the fitting portion (32) is inserted into the opening (31) of the main body (31). 311), the fitting portion (32) has an annular shape, a first connection hole (321) is drilled in the fitting portion (32), and the nut seat (20) 2. The electronic expansion valve according to claim 1, wherein one end of is inserted into the opening (311), penetrates the connection sleeve (30) and protrudes from the first connection hole (321). A second connection hole (322) is further formed in the fitting portion (32), and the second connection hole (322) and the first connection hole (321) communicate with each other. Item 3. The electronic expansion valve according to item 2. 2. The method according to claim 1, wherein said fitting portion (32) is a plurality of convex ribs, and said plurality of convex ribs are provided at intervals along the circumferential direction of the inner wall of said body portion (31). Electronic expansion valve. said nut seat (20) includes a mounting segment (21) and a guide segment (22) connected to each other, said guide segment (22) being located at one end relatively close to said valve seat (10); The mounting segment (21) abuts the connecting sleeve (30), one end of the guide segment (22) protrudes from the first connecting hole (321), the hole diameter of the first connecting hole (321) is less than the outer diameter of the guide segment (22). 2. The inner wall of the body portion (31) is provided with a threaded segment (312), and the threaded segment (312) is provided circumferentially surrounding the inner wall of the body portion (31). The electronic expansion valve according to . the hardness of the connection sleeve (30) is greater than the hardness of the nut seat (20),
and/or electronic expansion valve according to claim 1, wherein the connecting sleeve (30) has a hardness greater than or equal to that of the valve seat (10). 8. The electronic expansion valve according to claim 7, wherein the connecting sleeve (30) is a powder metallurgical material, a stainless material or a copper material. A notch (313) is formed in the inner wall of the connecting sleeve (30), and the notch (313) is located at one end of the connecting sleeve (30) away from the valve seat (10). , The nut seat (20) is provided with a balancing hole (23), and the notch (313) and the balancing hole (23) communicate with each other. . An outer wall of the connection sleeve (30) is provided with a rotation stopper (33), the connection sleeve (30) is attached to the valve seat (10), and the rotation stopper (33) is attached to the valve seat. Electronic expansion valve according to claim 1, engaged with (10) and able to position said connecting sleeve (30) in the circumferential direction.

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