An electrically operated switching valve

Abstract

The application discloses an electric switch valve, which is characterized in that: a regulating valve port matched with a rotating slider is divided into a large flow area and a small flow area, the slit-shaped small flow area is located at the radial outside of the large flow area and is formed by extending outward from the flow area; a slider working surface matched with the regulating valve port can realize small flow regulation and large flow regulation by rotating the slider; during the working process, the working surface corresponding to the small flow regulation section can gradually change the shielding area of the small flow area while shielding the large flow area completely, so as to realize small flow regulation; meanwhile, the working surface corresponding to the large flow regulation section can gradually change the shielding area of the large flow area, so as to realize large flow regulation. Based on the design of the small flow area of the regulating valve port, the flow change amount is small during the shielding process of small flow regulation under the condition that the displacement amount of the slider is the same, so that the functional requirement of high-precision small flow regulation can be met, and meanwhile, large flow regulation can also be realized.

Description

Technical Field

[0001] This invention relates to the field of fluid control technology, and more specifically to an electrically operated switching valve. Background Technology

[0002] To achieve precise temperature control in a refrigerator, it is necessary to adjust the flow rate of the refrigerant. For those skilled in the art, how to improve the electric switching valve and optimize its design to achieve high-precision small-flow rate adjustment is a technical problem that urgently needs to be solved. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a novel structured electric switching valve capable of precise regulation of small flow rates.

[0004] The electronic switching valve provided by this invention includes a valve seat and a housing, the valve seat being fixedly connected to the housing; it also includes a slider and a gear transmission mechanism, the output end of which is connected to the slider to drive the slider to rotate relative to the valve seat to switch working positions; the end of the slider opposite to the valve seat has a working surface adapted to a regulating valve port, the regulating valve port communicating with an outlet hole opened on the valve seat, and configured such that: in a projection plane parallel to the working surface, the regulating valve port includes a large flow area and a small flow area, the small flow area being located within the diameter of the large flow area. Outwardly, and the small flow area is a slit-like structure extending outward from the large flow area, the outer periphery of the working surface includes a small flow adjustment section and a large flow adjustment section; during the process of the slider switching working positions, the small flow adjustment section and the large flow adjustment section of the working surface are sequentially adapted to the regulating valve port; wherein, the working surface corresponding to the small flow adjustment section constitutes complete shielding of the large flow area, and the shielding area of ​​the small flow area can be gradually changed; the working surface corresponding to the large flow adjustment section can gradually change the shielding area of ​​the large flow area.

[0005] Compared to the prior art, the regulating valve port of this invention, adapted to the rotating slider, is divided into a large flow zone and a small flow zone. The slit-shaped small flow zone is located radially outside the large flow zone and extends outward from it. Correspondingly, the working surface of the slider adapted to the regulating valve port can respectively realize small flow rate regulation and large flow rate regulation as the slider rotates. During operation, the working surface corresponding to the small flow rate regulation section can gradually change the coverage area of ​​the small flow zone while completely blocking the large flow zone to achieve small flow rate regulation; simultaneously, the working surface corresponding to the large flow rate regulation section can gradually change the coverage area of ​​the large flow zone to achieve large flow rate regulation. In comparison, based on the design of the small flow zone of the regulating valve port, under the same slider displacement, the flow rate change during the small flow rate regulation blocking process of this invention is smaller, thus meeting the functional requirements of high-precision small flow rate regulation, while also achieving large flow rate regulation. It has excellent regulating function. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of the overall structure of the electronic switching valve described in a specific embodiment;

[0007] Figure 2 for Figure 1 The exploded view of the electronic switching valve assembly shown.

[0008] Figure 3 for Figure 1 A top view of the valve seat shown;

[0009] Figure 4 for Figure 3 AA section view;

[0010] Figure 5 The relative positions of the large-flow-through region and the small-flow-through region configured on the throttling plate are shown.

[0011] Figure 6 It shows Figure 2 View of the slider shown from direction B;

[0012] Figure 7a , Figure 7b , Figure 7c , Figure 7d , Figure 7e and Figure 7f The characteristic points of the adaptation relationship between the slider and the regulating valve port under different working conditions are shown respectively;

[0013] Figure 8 Top view showing the fit between the throttling vane and the valve seat;

[0014] Figure 9 This is a schematic diagram of the overall structure of the retaining ring;

[0015] Figure 10 An exploded view showing the assembly relationship of the valve seat, throttle plate, retaining ring, and slider.

[0016] In the picture:

[0017] 1. Housing; 2. Rotor; 3. Coil assembly; 4. Valve seat; 41. Inlet hole; 42. Outlet hole; 43. Large flow channel; 44. Small flow channel; 45. Inner concave ring groove; 46. Positioning hole; 47. Protruding edge; 5. Shaft; 6. Bushing; 7. Slider; 71. Working surface; 71. Fully closed section; 711. Small flow regulating section; 712. Large flow regulating section; 713. Fully open section; 714. Boss; 72. Outer protrusion; 73. Center hole; 74. Planetary gear transmission mechanism; 8. Sun gear; 81. Internal gear ring; 82. Throttling plate; 9. Large flow area; 91. Small flow area; 92. Positioning block; 93. Center hole; 94. Retaining ring; 10. Limiting part; 101. Positioning groove; 102. Stopping part; 103. Outer ring support part; 104. Positioning column; 105. Inlet transition channel; 107. Spring; 11. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Please see Figure 1 and Figure 2 ,in, Figure 1 This is a schematic diagram of the overall structure of the electronic switching valve described in this embodiment. Figure 2 for Figure 1 The exploded view of the electronic switching valve assembly is shown.

[0020] The electronic switching valve includes a housing 1 and a rotor 2 built into the housing 1. A coil assembly 3 mounted on the outside and the rotor 2 together form a stepper motor. A valve seat 4 is sealed to the housing 1 to form an internal valve cavity. The valve seat 4 has an inlet port 41 and an outlet port 42, which are connected to the inlet pipe and the outlet pipe, respectively, to form a fluid passage. Please refer to [further details omitted]. Figure 3 and Figure 4 ,in, Figure 3 for Figure 1 The top view of the valve seat shown. Figure 4 for Figure 3 AA sectional view.

[0021] like Figure 1 and Figure 2 As shown, one end of shaft 5 is fixed to valve seat 4, and the other end is inserted into bushing 6, serving as the basic component of the valve. When coil assembly 3 is energized, rotor 2 rotates around shaft 5, driving slider 7, which is adapted to regulating valve ports (91, 92), to rotate relative to valve seat 4, switching between fully open and fully closed operating positions, while adjusting the opening degree according to system requirements.

[0022] Without loss of generality, this embodiment illustrates the power transmission path using a planetary gear transmission mechanism 8. As shown in the figure, the input end of the planetary gear transmission mechanism 8 is the sun gear 81, and the output end is the internal gear ring 82. In this embodiment, the sun gear 81 is mounted on the shaft 3 and can rotate synchronously under the drive of the rotor 2, driving the slider 7 to rotate via the internal gear ring 82. It should be understood that, depending on the needs of different product types, the transmission principle of the planetary gear transmission mechanism 8 is not limited to the planetary transmission form shown in the figure; alternatively, non-planetary gear transmission mechanisms can also be used, as long as the function of transmitting power is satisfied.

[0023] The slider 7 has a working surface 71 at the end opposite to the valve seat 4. This working surface 71 is adapted to the regulating valve ports (91, 92) of the connecting outlet hole 42, and is configured such that, within a projection plane parallel to the working surface 71, the regulating valve port includes a large flow area 91 and a small flow area 92. Please refer to [further details omitted]. Figure 5 The figure shows the relative positions of the large flow region 91 and the small flow region 92 configured on the throttling vane 9. The small flow region 92 is located radially outside the large flow region 91, and the small flow region 92 is a slit-shaped extension from the flow region to form a small flow regulation.

[0024] The slider 7 has a central hole 74 for mounting on the shaft 5, and the slider 7 is axially pressed against the throttling plate 9 by a spring 11. (See also...) Figure 6 The figure shows a view of the slider from direction B.

[0025] The outer periphery of the working surface of the slider 7 includes a fully closed section 711, a small flow rate regulating section 712, a large flow rate regulating section 713, and a fully open section 714 arranged sequentially; please refer to the above. Figure 7a , Figure 7b , Figure 7c , Figure 7e and Figure 7f The diagram illustrates the characteristic points of the fit between the slider and the regulating valve orifice under different operating conditions. For example, but not limited to, Figure 7a The slider 7, which is in the fully closed working position, rotates counterclockwise to switch to... Figure 7f The fully open working position shown, wherein, Figure 7b The critical point at which the working surface 71 of slider 7 completely covers the regulating valve port. Figure 7c This is an adaptation state for adjusting the flow rate. Figure 7d This is an adaptation state for the transition between small flow rate adjustment and large flow rate adjustment. Figure 7e This is an adaptation state for high flow rate adjustment.

[0026] like Figure 7aAs shown, the working surface 71 corresponding to the fully closed section 711 can completely block the regulating valve port. In this state, the valve is closed and no flow passes through the regulating valve port. During valve opening operation, as the slider 7 rotates counterclockwise to... Figure 7b As shown in the critical point, its working surface 71 first adapts to the small flow region 92, and then adapts to the large flow region 91. During the rotation of the slider 7, the area of ​​the outer contour of its working surface 71 that shields the regulating valve port groove is continuously changed, thereby realizing flow regulation.

[0027] During the rotation of slider 7, the working surface 71 corresponding to the small flow rate adjustment section 712 completely shields the large flow area 92, and the shielding area of ​​the small flow area 92 can be gradually changed, as shown in Figure 7c, to perform small flow rate adjustment. Next, the working surface 71 corresponding to the large flow rate adjustment section 713 can gradually change the shielding area of ​​the large flow area 92, as shown in Figure 7c. Figure 7e As shown, this is for adjusting the flow rate. Slider 7 continues to rotate until... Figure 7f When the valve is in the fully open working position as shown, the working surface 71 corresponding to the fully open section 714 does not block the regulating valve port. In this state, the sum of the flow rate in the large flow area 91 and the flow rate in the small flow area 92 of the regulating valve port is the maximum opening of the valve port.

[0028] It is understandable that, based on the rotational shielding relationship between the slider working surface 71 and the large flow area 91 and the small flow area 92, the large flow area 91 and the small flow area 92 can be arranged symmetrically along the radial center line passing through the center of the circle, or they can be configured in a direction other than the radial center line. As long as they are arranged radially inward and outward to meet the need to be adapted to the working surface 71 in sequence, they are all within the scope of protection claimed in this application.

[0029] To further improve the controllability of the small flow rate adjustment, preferably, at least the small flow rate adjustment section 712 of the outer periphery of the working surface 71 is configured as an Archimedean spiral arc segment formed with the rotation center of the slider 7 as a fixed point. Correspondingly, the slit constructing the small flow passage 92 is a radially extending straight line, which can be processed using laser engraving technology. With this configuration, during the rotation of the slider 7, the front section of the valve port ( Figure 7b Position Orientation Figure 7c The near-linear change in the shielding area of ​​the action makes the process of small flow rate adjustment more linear, resulting in better controllability and reliability.

[0030] In this design, the large flow zone 91 of the regulating valve port can be a circular hole concentric with the outlet hole 42.

[0031] For example, but not limited to, the fully enclosed section 711 of the outer periphery of the working surface 71 can also be an Archimedean spiral arc segment, as shown in the figure. This fully enclosed section 711 and the small flow rate adjustment section 712 can leave the fixed point at the same uniform speed, and at the same time rotate around the rotation center at a fixed angular velocity to form the outer periphery, which can effectively balance the operation performance and process cost.

[0032] in addition, Figure 5 The high-flow-rate regulating section 713 shown is a straight section and is located in... Figure 7d When transitioning between small and large flow rate regulation, the straight segment (713) is parallel to the straight slit that forms the small flow zone 92. This allows the valve to quickly and fully open when transitioning from small flow rate regulation segment 712 to large flow rate regulation, further improving valve opening efficiency. Furthermore, the fully open segment shown in the figure consists of another straight segment perpendicular to the straight segment (713) and another straight segment (714) connected in the same direction as the straight segment (713); naturally, each segment of the outer contour of the working surface 71 uses rounded corners for transition.

[0033] It should be noted that the outer periphery of the working surface of the slider 7 is sequentially arranged with a fully closed section 711, a small flow rate regulating section 712, a large flow rate regulating section 713, and a fully open section 714. The transition position of the outer periphery of adjacent working sections can be divided and set according to the actual product opening degree. It should be understood that, without affecting the normal valve function, the transition position of each outer periphery does not constitute an absolute physical division of the functions of adjacent working sections.

[0034] To further improve manufacturability, slider 7 can be further optimized, combined with... Figure 1 and Figure 6 As shown, the slider body of this solution has an axially extending boss 72, and the working surface 71 adapted to the regulating valve port is formed by the end face of the boss 72.

[0035] It should be noted that the regulating valve port in this design is located on the throttling plate 9 to facilitate control of machining and assembly accuracy. Theoretically, the regulating valve port could also be formed directly on the upper surface of the valve seat, which would also allow for opening adjustment in conjunction with the rotating slider. However, this design places the regulating valve port on the throttling plate 9, which is independent of the valve seat 4, thus offering better manufacturability.

[0036] Combination Figure 1 and Figure 2 As shown, the throttling vane 9 is fixedly fitted to the valve seat 4 to prevent the medium from passing between the throttling vane 9 and the valve seat 7. Specifically, the throttling vane 9 is provided with a central hole 94 for fitting onto the shaft 5. An outlet transition flow channel corresponding to the regulating valve port is opened on the mating end face of the valve seat 4 and the throttling vane 9 to establish a complete medium outflow path.

[0037] Please see also Figure 1 , Figure 2 , Figure 3 and Figure 8 ,in, Figure 8 This is a top view showing the fitting relationship between the throttling plate and the valve seat in this scheme. Corresponding to the large flow zone 91 and the small flow zone 92, the outlet transition flow channel includes a large flow channel 43 and a small flow channel 44. In the projection plane parallel to the working surface 71, the large flow channel 43 covers the large flow zone 91 of the regulating valve port, and the large flow channel 44 covers the small flow zone 92 of the regulating valve port. In this way, the medium can flow out smoothly in different flow regulation stages, ensuring the accuracy of flow control.

[0038] Furthermore, the retaining ring 10 can be used to limit the axial relative position between the throttling plate 9 and the valve seat 4. Please refer to [further details]. Figure 1 , Figure 2 and Figure 9 ,in, Figure 9 This is a schematic diagram of the overall structure of the retaining ring.

[0039] As shown in the figure, the retaining ring 10 has a radially extending limiting part 101. After assembly, the limiting part 101 can axially press against the throttling plate 9 so that the throttling plate 9 can be fitted and fixed to the valve seat 4. Of course, the limiting part 101 only needs to press against the outer peripheral edge of the throttling plate 9, thereby minimizing the size of the associated components and improving the product integration. In this solution, a circumferential flange 47 can be provided on the valve seat 4 for flange riveting and fixing the retaining ring 10, which is simple in structure and easy to operate.

[0040] Here, the limiting parts 101 are configured as multiple circumferentially distributed parts, which can evenly limit the axial movement of the throttling vane 9. For the throttling vane 9, a circumferential positioning structure can be further added, such as... Figure 9 As shown, at least one limiting part 101 has a positioning groove 102 on its inner edge, and correspondingly, the outer edge of the throttling plate 9 has a positioning block 93 that is adapted to the positioning groove 102 to limit the circumferential position of the throttling plate 9.

[0041] To achieve optimal valve operation, an optimized structure can be used to limit the fully open and fully closed positions of the slider 7. For example... Figure 6 As shown, the outer peripheral surface of the slider 7 has a radially outwardly extending convex portion 73, combined with... Figure 1 , Figure 2 and Figure 9 As shown, the retaining ring 10 has a stop portion 103 that extends axially toward the slider 7.

[0042] Based on the rotation of slider 7, the two sides of its outward protrusion 73 can respectively abut and fit against the two sides of the stop portion 103 of retaining ring 10 in the circumferential direction, such as... Figure 7aAs shown, when the slider rotates to the fully closed working position, one side of the protrusion 73 abuts against one side of the stop 103, as... Figure 7f As shown, when the slider rotates to the fully open working position, the other side of the protrusion 73 abuts against the other side of the stop 103; thereby, the fully open working position and the fully closed working position of the slider 7 are respectively defined.

[0043] Here, the slider 4 can be integrally formed with the internal gear ring 82 of the planetary gear transmission mechanism 8 to reduce manufacturing costs. In addition, based on the feature that the slider 4 and the internal gear ring 82 are integrally formed, the boss 72 can be axially arranged along the outer surface of the internal gear ring 82, so that the fitting part with the limiting part 101 can make full use of the upper space of the slider 4, and the structure is more reliable and stable.

[0044] Other examples Figure 1 , Figure 3 and Figure 4 As shown, the mating end face of the valve seat 4 and the throttling plate 9 has a concave annular groove 45 to accommodate at least a portion of the retaining ring 10 structure. An inlet hole 41 is formed at the bottom of the concave annular groove 45; at least a portion of the retaining ring 10 is fitted into the concave annular groove 45, and the outer edge of the retaining ring 10 has an outer annular support portion 104 extending axially toward the valve seat 4 to abut against the bottom of the concave annular groove 45 for axial assembly and positioning. Please also refer to... Figure 10 The figure shows an exploded view of the assembly relationship of the valve seat, throttle plate, retaining ring and slider.

[0045] Furthermore, a positioning hole 46 is provided on the bottom of the concave annular groove 45, and a positioning post 105 adapted to the positioning hole 46 is provided on the opposite side of the retaining ring 10. In this way, when the two are assembled, the positioning post 105 and the positioning hole 46 can form a circumferential positioning between the retaining ring 10 and the valve seat 4, ensuring that the associated structure on the medium flow path can be accurately aligned. At the same time, this circumferential positioning can also prevent the medium from impacting the retaining ring 10 and causing abnormal displacement.

[0046] In addition, such as Figure 9 As shown, the body of the retaining ring 10 has multiple circumferentially distributed inlet transition channels 107 to divert the flow of medium flowing into the valve through the inlet hole 41, thereby preventing the air flow from acting on the slider 7 and causing unnecessary impact, which can reduce internal leakage of the product.

[0047] It should be noted that the fixing structure of the electronic switching valve described in this embodiment is not limited to the structure shown in the figure. The specific structure can be selected according to the product design requirements and manufacturability. For example, the housing 1 can adopt a split housing structure and be connected by welding, such as brazing.

[0048] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An electronic switching valve, characterized in that, The device includes a valve seat and a housing, the valve seat being fixedly connected to the housing; it also includes a slider and a gear transmission mechanism, the output end of which is connected to the slider to drive the slider to rotate relative to the valve seat to switch working positions; the end of the slider opposite to the valve seat has a working surface adapted to a regulating valve port, the regulating valve port communicating with an outlet hole opened on the valve seat, and configured such that: in a projection plane parallel to the working surface, the regulating valve port includes a large flow area and a small flow area, the small flow area being located radially outside the large flow area, and... The small flow zone is a slit-like structure extending outward from the large flow zone. The outer periphery of the working surface includes a small flow rate adjustment section and a large flow rate adjustment section. During the process of the slider switching working positions, the small flow rate adjustment section and the large flow rate adjustment section of the working surface are sequentially adapted to the regulating valve port. The working surface corresponding to the small flow rate adjustment section constitutes complete shielding of the large flow zone and can gradually change the shielding area of ​​the small flow zone. The working surface corresponding to the large flow rate adjustment section can gradually change the shielding area of ​​the large flow zone.

2. The electronic switching valve according to claim 1, characterized in that, At least the small flow adjustment section of the outer periphery of the working surface is configured as follows: an Archimedean spiral arc segment formed with the rotation center of the slider as a fixed point, and the slit that constructs the small flow zone is a straight line extending radially.

3. The electronic switching valve according to claim 2, characterized in that, The high-flow-rate adjustment section is a straight line segment, and is configured such that the straight line segment located at the transition position between the low-flow-rate adjustment and the high-flow-rate adjustment is parallel to the straight slit.

4. The electronic switching valve according to claim 3, characterized in that, The large flow zone is a circular hole concentric with the outlet hole.

5. The electronic switching valve according to claim 4, characterized in that, The body of the slider has an axially extending boss, and the end face of the boss forms the working surface.

6. The electronic switching valve according to any one of claims 1 to 5, characterized in that, The valve seat is provided with a throttling plate that fits and is fixed thereto. The regulating valve port is opened on the throttling plate. The valve seat has an outlet transition flow channel that is correspondingly provided to the regulating valve port on the mating end face of the throttling plate.

7. The electronic switching valve according to claim 6, characterized in that, The outlet transition channel includes a high-flow-rate channel and a low-flow-rate channel. In a projection plane parallel to the working surface, the high-flow-rate channel covers the large-flow area of ​​the regulating valve orifice, and the high-flow-rate channel covers the low-flow-rate area of ​​the regulating valve orifice.

8. The electronic switching valve according to claim 6, characterized in that, It also includes a retaining ring fixedly connected to the valve seat, the retaining ring having a radially inwardly extending limiting portion, the limiting portion axially pressing against the throttling plate so that the throttling plate fits and is fixed to the valve seat.

9. The electronic switching valve according to claim 8, characterized in that, The limiting parts are configured as a plurality of circumferentially distributed parts, and at least one of the limiting parts has a positioning groove on its inner edge. The outer edge of the throttling plate has a positioning block that matches the positioning groove to limit the circumferential position of the throttling plate.

10. The electronic switching valve according to claim 9, characterized in that, The outer periphery of the working surface also includes a fully closed section and a fully open section, and is configured such that: along the rotation direction of the slider from the fully closed working position to the fully open working position, the fully closed section is located upstream of the small flow rate regulating section, and the fully closed section is located downstream of the large flow rate regulating section; the working surface corresponding to the fully closed section can completely shield the regulating valve port, and the working surface corresponding to the fully open section does not shield the regulating valve port.

11. The electronic switching valve according to claim 10, characterized in that, The outer peripheral surface of the slider has a radially outwardly extending convex portion, and the retaining ring has a stop portion extending axially toward the slider; the two sides of the convex portion can respectively abut and fit against the two sides of the stop portion in the circumferential direction to define the fully open working position and the fully closed working position of the slider respectively.

12. The electronic switching valve according to claim 11, characterized in that, The valve seat has an inner concave annular groove on its mating end face with the throttling plate, and the inlet hole on the valve seat is opened at the bottom of the inner concave annular groove; at least part of the retaining ring is embedded in the inner concave annular groove, and the outer edge of the retaining ring has an outer ring support portion extending axially toward the valve seat to abut against the bottom of the inner concave annular groove.

13. The electronic switching valve according to claim 12, characterized in that, The retaining ring body has multiple circumferentially distributed inlet transition channels.

14. The electronic switching valve according to claim 12, characterized in that, The bottom of the concave annular groove and the retaining ring on the opposite side are provided with a positioning hole on one side and a positioning post that matches the positioning hole on the other side.

15. The electronic switching valve according to any one of claims 1 to 5, characterized in that, The gear transmission mechanism is a planetary gear transmission mechanism, with its sun gear as the input end and its internal gear ring as the output end; and the slider and the internal gear ring are integrally formed.

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