CN114704647B

CN114704647B - Electric switching valve

Info

Publication number: CN114704647B
Application number: CN202210429080.7A
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Current assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Priority date: 2022-04-22
Filing date: 2022-04-22
Publication date: 2024-07-02
Anticipated expiration: 2042-04-22
Also published as: CN114704647A

Abstract

The invention discloses an electric switching valve, wherein a valve needle is provided with a first adjusting section and a second adjusting section which are adjacently arranged, the outer peripheral surface of the second adjusting section is provided with a concave adjusting groove, the second adjusting section is positioned at the upstream side of the first adjusting section along the opening direction of the valve needle, the cross section of the adjusting groove of the second adjusting section is gradually increased, and the cross section of the first adjusting section is gradually decreased; a seal radially adapted to the valve needle is disposed in the interior cavity to form a flow barrier between an inlet side and an outlet side of the interior cavity and configured to: after the valve needle is separated from the valve port, the sealing element sequentially constructs corresponding flow rate with the second adjusting section and the first adjusting section of the valve needle; wherein the second flow rate established by the sealing element and the second adjusting section is smaller than the first flow rate established by the sealing element and the first adjusting section. By the adoption of the scheme, large-flow regulation and accurate small-flow regulation can be achieved, and good regulation functions are achieved.

Description

Electric switching valve

Technical Field

The invention relates to the technical field of fluid control, in particular to an electric switching valve.

Background

In order to accurately regulate the temperature of the refrigerator, micro flow regulation of a refrigerating medium is needed, and how to improve an electric switching valve to perform optimal design so as to realize high-precision small flow regulation is a technical problem to be solved urgently for a person skilled in the art.

Disclosure of Invention

In order to solve the technical problems, the invention provides the novel-structure electric switching valve which can realize accurate adjustment of small flow.

The invention provides an electric switching valve which comprises a valve seat and a shell, wherein the valve seat is provided with an inner cavity capable of communicating an inlet and an outlet; the valve needle is at least partially inserted into the valve seat, and a screw rod transmission mechanism is arranged in the shell, and the output end of the screw rod transmission mechanism is matched with the valve needle so as to axially control the valve needle to switch working positions relative to a valve port of the valve seat; the valve needle has a first and a second adjacently arranged adjustment segment, the adjustment slot cross-section of the second adjustment segment that is relatively closer to the first adjustment segment being larger than the adjustment slot cross-section of the second adjustment segment that is relatively farther from the first adjustment segment, the adjustment slot cross-section of the first adjustment segment that is relatively closer to the second adjustment segment being larger than the adjustment slot cross-section of the first adjustment segment that is relatively farther from the second adjustment segment; a seal adapted to the valve needle is arranged in the inner chamber, and can construct corresponding throughflow with the second adjusting section and the first adjusting section of the valve needle; wherein the second flow rate established by the sealing element and the second adjusting section is smaller than the first flow rate established by the sealing element and the first adjusting section.

Compared with the background art, the valve needle is provided with the first adjusting section and the second adjusting section, and the sealing element matched with the valve needle is arranged in the valve seat inner cavity so as to form a through flow barrier between the inlet side and the outlet side of the inner cavity; in the working process, after the valve needle is separated from the valve port, the sealing element can sequentially form corresponding flow rate with the second adjusting section and the first adjusting section of the valve needle; the second flow rate of the sealing element formed by the second adjusting section is smaller than the first flow rate of the sealing element formed by the first adjusting section. By the arrangement, along with the axial displacement of the valve needle, small flow regulation and large flow regulation can be respectively realized; simultaneously, when carrying out low flow and adjusting, the sealing member with the radial adaptation of needle can keep the cohesion relation with the needle outer peripheral surface, and this in-process fluid can only flow out through the adjustment groove of second adjustment section, can effectively avoid the too big problem of internal leakage. Simple and reliable structure and good adjusting function.

Drawings

FIG. 1 is a schematic diagram of an electric switching valve according to an embodiment;

FIG. 2 is an axial cross-sectional view of the electrically operated switching valve shown in FIG. 1;

FIG. 3 is an enlarged view of section I of FIG. 2;

FIG. 4 is a schematic view of the overall structure of the valve needle shown in FIG. 2;

FIG. 5 is a schematic diagram of the small flow adjustment state adaptation of the electrically actuated switching valve shown in FIG. 2;

FIG. 6 is a schematic diagram of the mass flow rate regulation status adaptation of the electrically operated switching valve shown in FIG. 2;

FIG. 7 is a section II-II of FIG. 3;

FIG. 8 is an enlarged view of portion III of FIG. 7;

Fig. 9 is an axial sectional view of the electric switching valve shown in the second embodiment;

fig. 10 is an enlarged view of the portion iv of fig. 9.

In the figure:

The valve seat comprises a shell 1, a rotor 2, a valve seat 3, a valve seat body 31, a first mounting spigot 311, a second mounting spigot 312, a valve seat core 32, a valve port 321, a valve seat body 31', a first mounting spigot 311', a valve seat core 32', a third spigot 322', a valve needle 4, an adjusting groove 41, a screw rod 5, a nut 6, a spring 7, a sealing element 8, a limiting element 9, a limiting ring 91, a cylinder 92, a middle through hole 93, a limiting element 9', a middle through hole 93 and a sealing ring 10;

an inlet nipple 14, an outlet nipple 15.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Embodiment one:

referring to fig. 1 and 2, fig. 1 is a schematic diagram of an electric switching valve according to the present embodiment, and fig. 2 is an axial sectional view of the electric switching valve shown in fig. 1.

The electric switching valve comprises a shell 1 and a rotor 2 arranged in the shell 1, and a coil assembly (not shown in the figure) sleeved outside and the rotor 2 form a stepping motor. The valve seat 3 has an inner cavity A which can be communicated with an inlet and an outlet, and the inlet and the outlet are respectively connected with an inlet connecting pipe 14 and an outlet connecting pipe 15 to form a fluid passage.

As shown in fig. 2, the valve needle 4 capable of axially displacing is partially inserted into the valve seat 3, the adapting end of the valve needle 4 is adapted to the valve port 321 on the valve seat 3 to switch between a fully-closed working position and a fully-open working position, and the opening degree is adjustable. A screw transmission mechanism is provided in the housing 1 for converting the rotational driving force of the rotor 2 into linear displacement and transmitting to the needle 4. The output end of the screw rod transmission mechanism is matched with the valve needle 4 to axially control the valve needle 4 to switch working positions relative to the valve port 321 of the valve seat 3.

Without loss of generality, the present embodiment illustrates a power transmission path by a screw transmission mechanism constructed by a screw 5 and a nut 6. In the figure, a rotor 2 and a screw rod 5 are relatively fixed, the screw rod 5 is driven to rotate along with the rotation of the rotor 2, and a nut 6 matched with the screw rod 5 is fixed with a valve seat 3, so that the rotation motion of the screw rod 5 is converted into axial linear motion. The screw rod 5 abuts against the valve needle 4 and pushes the valve needle 4 to move towards the direction of the valve port 321, and when the adapting end of the valve needle 4 moves downwards to be in contact with the round corner of the valve port 321, the valve needle 4 cannot move continuously, so that the fully-closed working position shown in fig. 2 is determined. In this process, the spring 7 between the needle 4 and the seat 3 is deformed under compression.

When the screw rod 5 is displaced in a direction away from the valve port, the spring 7 releases the reserved elastic deformation to push the valve needle 4 to displace synchronously with the screw rod 5. It will be appreciated that the form of the screw drive is not limited to that shown in the figures, as long as the above-described power transmitting function is fulfilled, depending on the needs of the different product types.

In this embodiment, the valve needle 4 has a first adjusting section S1 and a second adjusting section S2 that are adjacently arranged, please refer to fig. 3 and fig. 4 together, wherein fig. 3 is an enlarged view of a portion i of fig. 2, and fig. 4 is a schematic overall structure of the valve needle 4.

The second adjusting section S2 is provided with a concave adjusting groove 41 on the outer peripheral surface thereof, the second adjusting section S2 is located on the upstream side of the first adjusting section S1 along the opening direction of the valve needle 4, and the cross section of the adjusting groove 41 of the second adjusting section S2 is gradually changed in an increasing trend, and correspondingly, the cross section of the first adjusting section S1 is gradually changed in a decreasing trend, so that the adjustment of the corresponding flow rate is respectively realized in the valve opening process. That is, the adjustment groove cross section of the second adjustment section S2 that is relatively close to the first adjustment section S1 is larger than the adjustment groove cross section of the second adjustment section S2 that is relatively far away from the first adjustment section S1, and the adjustment groove cross section of the first adjustment section S1 that is relatively close to the second adjustment section S2 is larger than the adjustment groove cross section of the first adjustment section S1 that is relatively far away from the second adjustment section S2.

Accordingly, the present solution provides in the inner cavity a of the valve seat 3 a seal 8 radially adapted to the valve needle 4 to form a through-flow barrier between the inlet side and the outlet side of the inner cavity a and is configured to: after the valve needle 4 is separated from the valve port 321, the sealing element 8 sequentially constructs corresponding flow rates with the second adjusting section S2 and the first adjusting section S1 of the valve needle 4; referring to fig. 5 and 6, fig. 5 is a small flow rate adjusting state in which the sealing member 8 is adapted to the second adjusting section S2 of the valve needle 4, and fig. 6 is a large flow rate adjusting state in which the sealing member 8 is adapted to the first adjusting section S1 of the valve needle 4. The second flow rate of the sealing element 8, which is formed with the second control section S2, is smaller than the first flow rate of the sealing element, which is formed with the first control section S1.

As shown in fig. 4, the outer circumferential surface of the second adjustment segment S2 is of equal diameter to the body surface of the valve needle 4. When the valve needle 4 is displaced from the full-closing working position to the small flow regulating region, the surface matched with the sealing element 8 has no radial dimension change, the sealing element 8 is smoothly transited relative to the valve needle 4 during the switching of the region, the abrasion can be reduced, and the actuation noise can be effectively controlled.

In order to improve the sealing performance at the time of full closure, when the valve needle 4 is switched to the full closure operation position, as shown in fig. 3, the seal 8 and the body surface of the valve needle 4 on the upstream side of the second adjustment section S2 constitute a radial seal pair; in this state, on the one hand, a seal is formed between the seal 8 and the valve needle 4, while the fitting end of the valve needle 4 presses against the valve port 321 to form a second seal.

Of course, in this embodiment, the first adjusting section S1 is further fully utilized as an adaptation end of the valve needle 4 corresponding to the valve port 321, i.e. the valve port 321 is blocked by the first adjusting section S1 when the valve needle 4 is in the fully closed operating position shown in fig. 2. It is understood that the valve-port-fitting end of the valve needle 4 can also be configured in a separate manner, i.e. separately from the first adjusting section S1. In comparison, the first adjusting section S1 of the valve needle 4 in the scheme has the functions of large flow adjustment and valve port adaptation, has the characteristics of simple structure and high product integration level, and is relatively controllable in process cost.

In addition, the first adjustment section S1 of the valve needle 4 is tapered with a gradually decreasing cross section in the opening direction of the valve needle 4, such as, but not limited to, the conical shape shown in the figure, the cross section of the first adjustment section S1 having a linearly decreasing trend. At the same time, the cross-section of the adjustment groove 41 of the second adjustment section S2 of the valve needle 4 is in a linearly increasing trend along the opening direction of the valve needle 4. Therefore, the through flow cross sections of the two adjusting sections are linearly changed, and good technical guarantee is provided for accurately controlling the flow.

In addition, in order to facilitate the design of the transition structure and the manufacturability, the adjusting groove 41 is arranged along the axial direction as shown in fig. 4 and extends to the adjacent position of the first adjusting section S1 and the second adjusting section S2. It should be noted that the adjusting groove 41 on the first adjusting section S1 may be disposed along a direction parallel to the axial line of the valve needle 4, or other arrangements may be adopted, so long as the functional requirement that the cross section of the adjusting groove 41 is gradually changed is met, which is within the scope of the present application.

The number of the adjusting grooves 41 may be selected according to the setting requirements of different valve functions. For example, but not limited to, two adjustment slots 41 are provided at circumferentially spaced intervals as shown in the present embodiment, see fig. 7, which is a sectional view ii-ii of fig. 3.

The two adjustment grooves 41 are shown symmetrically arranged with respect to the body of the needle 4, but may be provided in a plurality of circumferentially spaced apart positions (not shown). The shape of the groove wall and the adjusting groove 41 may be selected as needed, for example, but not limited to, a concave folded line shape as shown in fig. 8, or may be a concave arc shape.

Based on the above basic structure, the gradually increasing trend of the cross section of the adjusting groove 41 of the second adjusting section S2 includes increasing the dimensions of the groove depth and the groove width, and of course, the cross section of the adjusting groove 41 is gradually changed, or the groove depth and the groove width may be unchanged, or the groove depth and the groove width may be increased.

The flow rate adjustment mechanism in the valve opening process of the electric switching valve according to the present embodiment will be briefly described with reference to fig. 2, 5 and 6.

1. Small flow regulation.

From the fully closed working position shown in fig. 2, when the rotor 2 drives the screw rod 5 to move upwards, the valve needle 4 moves upwards synchronously to be separated from the valve port 321, and the second adjusting section S2 of the valve needle 4 is firstly matched with the sealing element 8, as shown in fig. 5, based on the gradual increasing trend change of the cross section of the adjusting groove 41, the corresponding cross section area of the adjusting groove 41 is different along with the change of the axial relative position of the valve needle 4 and the sealing element 8, so that the small flow adjustment of the refrigerant flow flowing into the outlet connecting pipe 15 is realized.

Here, in order to achieve the same flow rate, the hydraulic radius of the flow-through groove 41 of this embodiment is larger than that of the concentric circular flow through hole of the conventional cone valve, and thus clogging is less likely to occur.

2. And (5) large flow rate adjustment.

When the rotor 2 drives the screw rod 5 to move upwards continuously, the valve needle 4 moves upwards synchronously until the first adjusting section S1 of the valve needle is matched with the sealing element 8, as shown in fig. 6, based on the gradual decreasing trend change of the cross section of the first adjusting section S1, the corresponding through flow section gradually increases along with the change of the axial relative position of the valve needle 4 and the sealing element 8, so that the large flow adjustment of the refrigerant flow flowing into the outlet connecting pipe 15 is realized.

In order to further optimize the assembly of the seal, a stop 9 with a central passage 93 can be preferably provided in the interior of the valve seat 3, in which central passage 93 the valve needle 4 is inserted.

Please refer to fig. 3. Based on the setting of the limiting piece 9, a sealing ring groove is formed between the limiting piece 9 and the valve seat 3, and the sealing piece 8 is placed in the sealing ring groove to form a limit meeting the assembly requirement. Preferably, the seal 8 is configured as a lip seal with a lip size larger than the central through hole 93 and smaller than the radial fitting surface of the valve needle 4, thereby satisfying a reliable sealing relationship. When the second adjusting section S2 of the valve needle 4 is displaced to be matched with the lip-shaped sealing ring, the lip size is smaller than the radial matching surface of the valve needle 4, so that the lip size and the radial matching surface always keep a fit relationship, and the refrigerant medium entering the inlet side of the inner cavity can only flow to the outlet side through the adjusting groove 41 on the second adjusting section S2, thereby solving the problem of overlarge internal leakage and ensuring the small flow adjusting precision.

Along with the reciprocating operation of valve switching, the spring ring of the lip-shaped sealing ring compresses the lubricating plastic ring, and even if lip abrasion occurs, the lip-shaped sealing ring can be kept to be always stuck to the outer peripheral surface of the valve needle 4, so that the abrasion loss is compensated, and the sealing reliability is good.

In this solution, the valve seat 3 includes a valve seat body 31 and a valve seat core 32 enclosing to form an inner cavity, where the valve seat body 31 has a first mounting spigot 311 adapted to the valve seat core 32, and may specifically accommodate the valve seat core 32 as shown in the figure, or partially accommodate the valve seat core 32 (not shown in the figure) according to structural design requirements. Accordingly, a seal ring groove for mounting the seal 8 is formed between the stopper 9 and the valve seat core 32.

Specifically, the limiting member 9 shown in fig. 3 includes a cylinder 92 and a limiting ring 91, the limiting ring 91 extends radially inward from an end portion of the cylinder 92 and forms a middle through hole 93, the inner wall of the valve seat body 31 has a second mounting spigot 312 capable of partially accommodating the cylinder 92, and two ends of the cylinder 92 are respectively pressed against the step surface valve seat core 32 of the second mounting spigot 312 in an axial direction, so that axial assembly and positioning are completed.

In addition, in order to prevent the fluid from flowing into the outlet nipple 15 from the fitting gap, a seal ring 10 may be provided between the valve seat body 31 and the valve seat core 32, for example, but not limited to, the seal ring 10 being provided between the step surface of the first mounting spigot 311 and the valve seat core 32, the valve seat core 32 pressing the seal ring 10 to deform, and the inner edge of the seal ring 10 and the outer peripheral surface of the cylinder 92 of the stopper 9 constituting a radial seal pair. Thus, fluid cannot flow from the gap between the cylinder 92 and the valve seat body 31 to the outlet nipple 15.

Embodiment two:

The present solution differs from the first embodiment in that a different stop 9' and its assembly relation is provided for the seal 8. Referring to fig. 9 and 10, fig. 9 is an axial sectional view of the electric switching valve according to the present embodiment, and fig. 10 is an enlarged view of the iv portion of fig. 9. To clearly illustrate the differences and associations of the present solution with the first embodiment, the same functional constitution and structure are shown with the same reference numerals in the drawings.

As shown, the valve seat 3 includes a valve seat body 31' and a valve seat core 32' enclosing a cavity, and likewise, the valve seat body 31' has a first mounting spigot 311' that can at least partially receive the valve seat core 32 '; a seal ring groove is formed between the stopper 9 'and the valve seat core 32'. In this solution, the limiting piece 9' with the middle through hole 93' is a limiting ring plate, the valve seat core 32' is provided with a third spigot 322', the third spigot 322' can at least partially accommodate the limiting ring plate, and the limiting ring plate (9 ') and the step surface of the third spigot 322' are axially pressed against to establish an axially fixed assembly relationship.

Other structures and connection relationships are the same as those of the first embodiment, and will not be described here again.

It should be noted that, the fixing structure of the electric switching valve in this embodiment is not limited to the structure shown in the drawings, and may be specifically selected according to the design requirement and manufacturability of the product, for example, the sealing member 8 may adopt other limiting structures.

The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims

1. The electric switching valve is characterized by comprising a valve seat and a shell, wherein the valve seat is provided with an inner cavity capable of communicating an inlet and an outlet; the valve needle is at least partially inserted into the valve seat, and a screw rod transmission mechanism is arranged in the shell, and the output end of the screw rod transmission mechanism is matched with the valve needle so as to axially control the valve needle to switch working positions relative to a valve port of the valve seat; the valve needle is provided with a first adjusting section and a second adjusting section which are adjacently arranged, the outer peripheral surface of the second adjusting section is provided with a concave adjusting groove, and the concave adjusting groove extends to the adjacent position of the first adjusting section and the second adjusting section; in the opening direction of the valve needle, the second adjustment section is located on the upstream side of the first adjustment section, the adjustment groove cross section of the second adjustment section relatively close to the first adjustment section is larger than the adjustment groove cross section of the second adjustment section relatively far from the first adjustment section, and the adjustment groove cross section of the first adjustment section relatively close to the second adjustment section is larger than the adjustment groove cross section of the first adjustment section relatively far from the second adjustment section; a seal adapted to the valve needle is arranged in the inner chamber, and can construct corresponding throughflow with the second adjusting section and the first adjusting section of the valve needle; wherein the second flow rate established by the sealing element and the second adjusting section is smaller than the first flow rate established by the sealing element and the first adjusting section.

2. The electrically operated switching valve as set forth in claim 1 wherein said seal establishes a radial seal pair with a body surface of said valve needle on an upstream side of said second adjustment segment when said valve needle is switched to a fully closed operating position.

3. The electrically operated switching valve as set forth in claim 2 wherein said first adjustment segment forms an adapter end of said valve needle corresponding to said valve port, said valve port being blocked by said first adjustment segment when said valve needle is in a fully closed operating position.

4. The electrically operated switching valve as set forth in any one of claims 1 to 3, further comprising a retainer having a central passage therein, a seal ring groove being formed between said retainer and said valve seat, said seal disposed in said seal ring groove being configured as a lip seal; the valve needle is inserted into the middle through hole, and the lip size of the lip-shaped sealing ring is larger than that of the middle through Kong Juxiao on the radial adaptation surface of the valve needle.

5. The electrically operated switching valve as set forth in claim 4 wherein said valve seat includes a valve seat body and a valve seat core circumscribing said interior cavity, said valve seat body having a first mounting spigot at least partially receiving said valve seat core; the sealing ring groove is formed between the limiting piece and the valve seat core, the limiting piece comprises a cylinder body and a limiting ring, the limiting ring radially extends inwards from the end part of the cylinder body and forms the middle through hole, the inner wall of the valve seat body is provided with a second installation spigot capable of at least partially accommodating the cylinder body, and two ends of the cylinder body are respectively pressed against the step surface of the second installation spigot and the valve seat core in the axial direction.

6. The electric switching valve according to claim 5, wherein a seal ring is further provided between the step surface of the first mounting spigot and the valve seat core, and an inner edge of the seal ring and an outer peripheral surface of the cylinder constitute a radial seal pair.

7. The electrically operated switching valve as set forth in claim 4 wherein said valve seat includes a valve seat body and a valve seat core circumscribing said interior cavity, said valve seat body having a first mounting spigot at least partially receiving said valve seat core; the sealing ring groove is formed between the limiting piece and the valve seat core, the limiting piece is a limiting ring plate, the valve seat core is provided with a third spigot capable of at least partially accommodating the limiting ring plate, and the limiting ring plate is axially pressed against the step surface of the third spigot.

8. The electrically operated switching valve as set forth in claim 2, wherein an outer peripheral surface of said second adjustment segment is isodiametric with a body surface of said valve needle.

9. The electrically operated switching valve as set forth in claim 8, wherein said first adjustment section is tapered with a gradually decreasing cross section in an opening direction of said valve needle.

10. The electrically operated switching valve as claimed in claim 8 or 9, characterized in that the adjusting groove cross-section of the second adjusting section has a linearly increasing trend and the cross-section of the first adjusting section has a linearly decreasing trend along the opening direction of the valve needle.

11. The electric switching valve according to claim 1, wherein the regulating grooves are provided in a plurality of circumferentially spaced apart positions, and the groove wall is in a concave arc shape or a concave folded line shape.

12. The electrically operated switching valve as in claim 11 wherein said gradual increasing trend in the cross-section of the adjustment groove of said second adjustment section along the opening direction of said valve needle comprises increasing groove depth and/or groove width dimensions.