CN114704647A

CN114704647A - Electric switching valve

Info

Publication number: CN114704647A
Application number: CN202210429080.7A
Authority: CN
Inventors: 不公告发明人
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: 2022-07-05
Anticipated expiration: 2042-04-22
Also published as: CN114704647B

Abstract

The invention discloses an electric switching valve, wherein a valve needle of the electric switching valve is provided with a first adjusting section and a second adjusting section which are adjacently arranged, the peripheral surface of the second adjusting section is provided with an inward 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 in gradually increasing trend change, and the cross section of the first adjusting section is in gradually decreasing trend change; a seal is arranged in the inner chamber, radially adapted to the valve needle, to form a through-flow barrier between an inlet side and an outlet side of the inner chamber, and configured to: after the valve needle is separated from the valve port, the sealing element and the second adjusting section and the first adjusting section of the valve needle sequentially form corresponding flow rates; wherein a second through-flow rate established by the sealing element with the second regulating section is smaller than a first through-flow rate established by the sealing element with the first regulating section. By applying the scheme, large-flow regulation and accurate small-flow regulation can be realized, and the regulator has good regulation function.

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 control the temperature of the refrigerator, a small flow rate of the refrigerant needs to be adjusted, and how to improve the electric switching valve to perform the optimal design to achieve the small flow rate adjustment with higher accuracy is a technical problem to be solved urgently for those skilled in the art.

Disclosure of Invention

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

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 in the valve seat, and the 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 the working position relative to the 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 cross section of an adjusting groove of the second adjusting section, which is relatively close to the first adjusting section, is smaller than that of an adjusting groove of the second adjusting section, which is relatively far away from the first adjusting section, and the cross section of the adjusting groove of the first adjusting section, which is relatively close to the second adjusting section, is larger than that of the adjusting groove of the first adjusting section, which is relatively far away from the second adjusting section; a sealing element which is matched with the valve needle is arranged in the inner cavity, and the sealing element can establish corresponding flow with the second adjusting section and the first adjusting section of the valve needle; wherein a second through-flow rate established by the sealing element with the second regulating section is smaller than a first through-flow rate established by the sealing element with the first regulating 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 inner cavity of the valve seat to form through-flow obstruction 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 establish corresponding through flow with the second adjusting section and the first adjusting section of the valve needle; the second through flow constructed by the sealing element and the second adjusting section is smaller than the first through flow constructed by the sealing element and the first adjusting section. With the arrangement, small flow regulation and large flow regulation can be respectively realized along with the axial displacement of the valve needle; simultaneously, when carrying out little flow control, can keep laminating with the sealing member of the radial adaptation of needle and needle periphery surface and hold the relation tightly, the fluid can only flow through the adjustment tank of second regulation section in this process, can effectively avoid the too big problem of internal leakage. Simple and reliable structure and good regulating 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;

figure 4 is a schematic view of the overall construction of the valve needle shown in figure 2;

FIG. 5 is a schematic diagram of a small flow regulation state adaptation relationship of the electric switch valve shown in FIG. 2;

FIG. 6 is a schematic diagram of a large flow regulation state adaptation relationship of the electric switching valve shown in FIG. 2;

FIG. 7 is a sectional view taken along line II-II of FIG. 3;

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

fig. 9 is an axial sectional view of the electric switch 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 piece 9, a limiting ring 91, a cylinder 92, a middle through hole 93, a limiting piece 9 ', a middle through hole 93' and a sealing ring 10;

an inlet connection pipe 14 and an outlet connection pipe 15.

Detailed Description

In order to make the technical solutions 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.

The first embodiment is as follows:

referring to fig. 1 and fig. 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 includes a housing 1 and a rotor 2 built in the housing 1, and a stepping motor is constituted by a coil assembly (not shown) fitted to the outside and the rotor 2. The valve seat 3 has an inner cavity a for communicating an inlet and an outlet, which are connected to an inlet connection pipe 14 and an outlet connection pipe 15, respectively, to form a fluid passage.

As shown in fig. 2, the valve needle 4 capable of axial displacement is partially inserted into the valve seat 3, and the adapting end of the valve needle 4 is adapted to the valve port 321 on the valve seat 3 to switch between the fully closed working position and the 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 a linear displacement and transmitting it to the needle 4. The output end of the screw rod transmission mechanism is adapted to the valve needle 4 to control the valve needle 4 to switch the working position relative to the valve port 321 of the valve seat 3 along the axial direction.

Without loss of generality, the present embodiment is illustrated as a power transmission path of a screw transmission mechanism constructed by the illustrated screw 5 and nut 6. As shown in the figure, the rotor 2 and the screw rod 5 are relatively fixed, the rotor 2 drives the screw rod 5 to synchronously rotate when rotating, and the nut 6 matched with the screw rod 5 is fixed with the valve seat 3, so that the rotating motion of the screw rod 5 is converted into axial linear motion. The screw rod 5 abuts on the valve needle 4 and pushes the valve needle 4 to displace towards the direction of the valve port 321, and when the adaptive end of the valve needle 4 moves downwards to contact with the rounded 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 pressure.

When the screw rod 5 moves towards the direction far away from the valve port, the spring 7 releases the stored elastic deformation to push the valve needle 4 to move synchronously with the screw rod 5. It should be understood that the structure of the screw driving mechanism is not limited to that shown in the drawings as long as the above-described function of transmitting power is satisfied, according to the requirements of different product types.

In this embodiment, the valve needle 4 has a first adjusting section S1 and a second adjusting section S2 which are adjacently disposed, 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 view of the whole structure of the valve needle 4.

The outer peripheral surface of the second adjusting section S2 is provided with an inward concave adjusting groove 41, the second adjusting section S2 is located at the upstream side of the first adjusting section S1 along the opening direction of the valve needle 4, 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 as to respectively realize the adjustment of the corresponding flow rate in the valve opening process. That is, the adjustment groove cross-section of second adjustment segment S2 relatively closer to first adjustment segment S1 is smaller than the adjustment groove cross-section of second adjustment segment S2 relatively farther from first adjustment segment S1, and the adjustment groove cross-section of first adjustment segment S1 relatively closer to second adjustment segment S2 is larger than the adjustment groove cross-section of first adjustment segment S1 relatively farther from second adjustment segment S2

Accordingly, the present solution provides a seal 8 in the inner cavity a of the valve seat 3, 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 configured to: after the valve needle 4 is separated from the valve port 321, the sealing element 8 establishes corresponding flow rates with the second adjusting section S2 and the first adjusting section S1 of the valve needle 4 in sequence; referring to fig. 5 and 6, fig. 5 shows a small flow regulating state in which the sealing member 8 is fitted to the second regulating section S2 of the valve needle 4, and fig. 6 shows a large flow regulating state in which the sealing member 8 is fitted to the first regulating section S1 of the valve needle 4. Wherein the second throughflow rate of the sealing element 8 with the second adjusting portion S2 is smaller than the first throughflow rate of the sealing element 8 with the first adjusting portion S1.

As shown in fig. 4, the outer peripheral surface of the second regulation section S2 is of the same diameter as the body surface of the valve needle 4. When the valve needle 4 displaces from the fully-closed working position to the small flow regulation interval, the surface matched with the sealing element 8 has no radial dimension change, the sealing element 8 can be smoothly transited relative to the valve needle 4 when switching in the interval, the abrasion can be reduced, and the actuating noise can be effectively controlled.

In order to improve the sealing performance at the time of full closure, when the needle 4 is switched to the full closure operating position, as shown in fig. 3, the seal 8 forms a radial seal pair with the body surface of the needle 4 on the upstream side of the second regulation section S2; in this state, on the one hand, the sealing element 8 forms a seal with the valve needle 4, and at the same time, the adapting end of the valve needle 4 presses against the valve port 321 to form a second seal.

Of course, the first adjustment section S1 is further fully utilized in the present embodiment as an adapting end of the valve needle 4 corresponding to the valve port 321, that is, when the valve needle 4 is in the fully closed working position shown in fig. 2, the valve port 321 is blocked by the first adjustment section S1. It will be appreciated that the valve port-adapting end of the valve needle 4 may also be configured as a separate structure, i.e., separately designed from the first regulating section S1. In comparison, the first adjusting section S1 of the valve needle 4 in the present scheme has two functions of large flow adjustment and valve port adapting end, and has the characteristics of simple structure and high product integration, and the process cost is relatively controllable.

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

In addition, to facilitate the transition structure design and the machining process, as shown in fig. 4, the adjustment groove 41 is axially disposed and extends to a position adjacent to the second adjustment section S2 of the first adjustment section S1. It should be noted that the adjusting groove 41 on the first adjusting section S1 may be arranged in a direction parallel to the axial line of the valve needle 4, and other arrangements may also be adopted, as long as the functional requirements that the cross section of the adjusting groove 41 changes in an increasing trend are satisfied, and all that is within the scope of the claimed application.

It should be noted that the number of the adjustment grooves 41 can be selected according to the setting requirements of different valve functions. For example, but not limiting of, two adjustment grooves 41 are shown in this embodiment at circumferentially spaced intervals, see fig. 7, which is a sectional view ii-ii of fig. 3.

As shown in the figure, the two adjustment grooves 41 are symmetrically arranged with respect to the body of the needle 4, and may be provided in plurality (not shown in the figure) at intervals in the circumferential direction. In addition, the shape of the adjustment groove 41 and the groove wall can be selected according to the requirement, such as but not limited to the inner fold line shape shown in fig. 8, or the inner arc shape can be also used.

Based on the basic structure, the gradually increasing trend of the cross section of the adjusting groove 41 of the second adjusting segment S2 includes the size increase of the groove depth and the groove width, and of course, the cross section of the adjusting groove 41 is gradually changed, and may also be the groove depth is not changed, the groove width is increased, or may be the groove depth is increased, and the groove width is not changed.

The flow rate adjusting 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.

First, small flow regulation.

From the fully-closed working position shown in fig. 2, when the rotor 2 drives the screw rod 5 to move upward, the valve needle 4 moves upward synchronously to separate from the valve port 321, and the second adjusting section S2 of the valve needle 4 is firstly adapted to the sealing element 8, as shown in fig. 5, based on the trend that the cross section of the adjusting groove 41 gradually increases, the cross section area of the corresponding 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 realize the same flow rate, the hydraulic radius of the circulation of the regulating groove 41 is larger than that of the concentric circular circulation hole of the conventional cone valve, so that the blockage is not easy to generate.

And secondly, adjusting the large flow.

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

In order to further optimize the installation of the sealing element, a stop element 9 with a central passage hole 93 can preferably be arranged in the interior of the valve seat 3, the valve needle 4 being inserted into the central passage hole 93.

Please refer to fig. 3. Based on the setting of the limiting part 9, a sealing ring groove is formed between the limiting part 9 and the valve seat 3, and the sealing element 8 is arranged in the sealing ring groove to form limiting meeting the assembling requirement. Preferably, the seal 8 is configured as a lip seal with a lip dimension larger than the central through hole 93 and smaller than the radial mating 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 fit with the lip-shaped sealing ring, since the lip size is smaller than the radial fit surface of the valve needle 4, the lip size and the radial fit surface are always in a fit relationship, the cold 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 excessive internal leakage and ensuring the small flow adjusting precision.

Along with the reciprocating operation of valve switching, the spring ring of lip sealing washer compresses tightly lubricated plastic ring, even if produce lip wearing and tearing, also can keep still closely the peripheral surface of needle 4 to realize the compensation to this wearing and tearing volume, have better sealing reliability.

In this scheme, valve seat 3 closes valve seat body 31 and valve seat core 32 that forms the inner chamber including enclosing, and valve seat body 31 has the first installation tang 311 with valve seat core 32 adaptation, specifically can hold valve seat core 32 as shown in the figure according to structural design needs, or part holds valve seat core 32 (not shown in the figure). Accordingly, a seal ring groove in which the seal 8 is installed 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 of the cylinder 92 and forms a middle through hole 93, the inner wall of the valve seat body 31 has a second installation seam allowance 312 capable of partially accommodating the cylinder 92, and two ends of the cylinder 92 are respectively pressed against the stepped surface valve seat core 32 of the second installation seam allowance 312 in the axial direction, so as to complete the axial assembly positioning.

In addition, in order to prevent the fluid from flowing into the outlet nipple 15 from the fitting clearance, 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 is provided between the step surface of the first mounting spigot 311 and the valve seat core 32, the valve seat core 32 compresses and deforms the seal ring 10, and the inner edge of the seal ring 10 and the outer peripheral surface of the cylinder 92 of the stopper 9 construct a radial seal pair. Thus, the fluid cannot flow from the clearance between the cylinder 92 and the valve seat body 31 to the outlet nipple 15.

Example two:

the present solution differs from the first embodiment in that a different stop element 9' and its assembly relationship are provided for the sealing element 8. Referring to fig. 9 and 10 together, fig. 9 is an axial sectional view of the electric changeover valve shown in the present embodiment, and fig. 10 is an enlarged view of an iv portion of fig. 9. For the sake of clearly illustrating the differences and connections between the present solution and the first embodiment, the same functional components and structures are shown by the same reference numerals in the drawings.

As shown, the valve seat 3 comprises a valve seat body 31 ' and a valve seat core 32 ' enclosing to form an inner cavity, and similarly, the valve seat body 31 ' has a first mounting spigot 311 ' capable of at least partially accommodating the valve seat core 32 '; a seal ring groove is formed between the stopper 9 'and the valve seat core 32'. In this embodiment, the limiting member 9 ' having the middle through hole 93 ' is a limiting ring plate, the valve seat core 32 ' has a third seam allowance 322 ', the third seam allowance 322 ' can at least partially accommodate the limiting ring plate, and the limiting ring plate (9 ') is axially pressed against a step surface of the third seam allowance 322 ' to establish an axially fixed assembling relationship.

Other components and connection relationships are the same as those in the first embodiment, and are not described herein again.

It should be noted that the fixing structure of the electric switching valve according to the present 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 element 8 may adopt other limiting structures.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection 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 which can be communicated with an inlet and an outlet; the valve needle is at least partially inserted in the valve seat, and the 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 the working position relative to the 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, an inward concave adjusting groove is formed in the peripheral surface of the second adjusting section, the second adjusting section is located on 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, which is relatively close to the first adjusting section, is smaller than that of the adjusting groove of the second adjusting section, which is relatively far away from the first adjusting section, and the cross section of the adjusting groove of the first adjusting section, which is relatively close to the second adjusting section, is larger than that of the adjusting groove of the first adjusting section, which is relatively far away from the second adjusting section; a sealing element matched with the valve needle is arranged in the inner cavity, and the sealing element can establish corresponding flow with the second adjusting section and the first adjusting section of the valve needle; wherein a second through-flow rate established by the sealing element with the second regulating section is smaller than a first through-flow rate established by the sealing element with the first regulating section.

2. The electrically switchable valve of claim 1 wherein the seal forms a radial seal pair with a body surface of the valve needle on an upstream side of the second adjustment segment when the valve needle is switched to the fully closed position.

3. The electrical switching valve of claim 2, wherein the first adjustment section forms an adaptive end of the valve needle corresponding to the valve port, and the valve needle is in the fully closed working position, and the valve port is blocked by the first adjustment section.

4. The electrical switching valve of any one of claims 1 to 3 further comprising a retainer having a central through hole in the interior cavity, wherein a sealing ring groove is formed between the retainer and the valve seat, and wherein the sealing member disposed in the sealing ring groove is 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 the middle through hole and smaller than the radial adaptation surface of the valve needle.

5. The electrically switchable valve of claim 4 wherein the valve seat comprises a valve seat body and a valve seat core enclosing the internal cavity, the valve seat body having a first mounting spigot that at least partially receives the valve seat core; the sealing ring groove forms the locating part with between the valve seat core, the locating part includes barrel and spacing ring, the spacing ring certainly the tip of barrel radially inwards stretches and forms the middle part via hole, the inner wall of valve seat body has and can at least partly holding the second installation tang of barrel, the both ends of barrel respectively with the step face of second installation tang with the valve seat core is to pressing.

6. The electrical switching valve of claim 5 wherein a sealing ring is further disposed between the stepped surface of the first installation spigot and the valve seat core, and an inner edge of the sealing ring and an outer peripheral surface of the barrel form a radial sealing pair.

7. The electrically switchable valve of claim 4 wherein the valve seat comprises a valve seat body and a valve seat core enclosing the internal cavity, the valve seat body having a first mounting spigot that at least partially receives the valve seat core; the sealing ring groove is formed between the limiting part and the valve seat core, the limiting part is a limiting ring plate, the valve seat core is provided with a third spigot which can at least partially accommodate the limiting ring plate, and the limiting ring plate is axially pressed against the step surface of the third spigot.

8. The electrically switchable valve of claim 2 wherein the outer peripheral surface of the second adjustment segment is of the same diameter as the body surface of the valve needle.

9. The electrically switchable valve of claim 8 wherein the first adjustment section is tapered with a gradually decreasing cross-section in the opening direction of the valve needle.

10. The electric switching valve according to claim 8 or 9, wherein along the opening direction of the valve needle, the cross section of the adjusting groove of the second adjusting section changes in a linearly increasing trend, and the cross section of the first adjusting section changes in a linearly decreasing trend.

11. The electrically switchable valve of claim 10 wherein the adjustment slot extends to a location adjacent the first adjustment segment and the second adjustment segment.

12. The electrical switching valve according to claim 1, wherein the adjustment grooves are provided in a plurality at intervals in the circumferential direction, and the groove wall is in an inner concave arc shape or an inner concave broken line shape.

13. The electrically switchable valve of claim 12 wherein the increasing trend of the cross-sectional profile of the adjustment groove of the second adjustment section in the opening direction of the valve needle comprises an increasing size of the groove depth and/or the groove width.