A slide and a directional control valve using the same

Abstract

The application discloses a slider and a reversing valve using the slider. The slider (3) is provided with a flow channel cavity (31) and two flow adjusting cavities (32). The two flow adjusting cavities (32) are respectively located on the two axial sides of the flow channel cavity (31). The flow adjusting cavity (32) comprises a transition cavity (321) and an adjusting flow channel (322). The adjusting flow channel (322) is transversely communicated with the transition cavity (321). The slider (3) comprises a first sealing surface (3a) and an outer side surface (3b). The longitudinal openings of the transition cavity (321) and the adjusting flow channel (322) are arranged on the first sealing surface (3a). The transverse port (323) of the adjusting flow channel (322) is located on the outer side surface (3b). The above-mentioned technology can improve the control precision of the intermediate flow of the reversing valve by arranging the flow adjusting cavity on the slider.

Description

Technical Field

[0001] This invention relates to the field of fluid control technology, and more specifically to a slider and a directional valve using the slider. Background Technology

[0002] Reversing valves are widely used in industrial equipment, such as the four-way reversing valve commonly used in air conditioning systems, to change the direction of fluid flow.

[0003] Please refer to Figures 1-2 , Figure 1 This is a schematic diagram of the main valve structure of a typical four-way directional valve. Figure 2 for Figure 1 A magnified view of a portion of region A in the middle.

[0004] A four-way directional valve consists of a main valve and a pilot valve. For example... Figure 1 As shown, a typical four-way directional valve's main valve includes a valve body 01, a valve seat 02, and a slider 03. The valve seat 02 is mounted on the valve body 01 and has three valve holes 021 spaced apart along the axial direction of the valve body 01. Each valve hole 021 is connected to a connecting pipe 04. The slider 03 can move within the valve body 01 to switch the connection state of each valve hole 021, thereby changing the connection state between each connecting pipe 04 and between each connecting pipe 03 and the valve body 01.

[0005] When slider 03 moves to the middle position, the valve holes 021 on both sides can connect with the inside of valve body 01, thus forming an intermediate flow state. The flow rate in this intermediate flow state is determined by the intermediate flow channel X. Figure 2 As shown, in the above typical four-way reversing valve, the intermediate flow channel X is formed by the valve hole 021 and the slider 03. The shape of the intermediate flow channel X is affected by the structural configuration of the valve seat 02 and the slider 03. Summary of the Invention

[0006] The purpose of this invention is to provide a reversing valve and a slider applied to the reversing valve, wherein the slider is provided with a flow regulating chamber, which can improve the control accuracy of intermediate flow.

[0007] To solve the above-mentioned technical problems, the present invention provides a slider, the slider being provided with a flow channel cavity and two flow regulating cavities, the two flow regulating cavities being respectively located on both axial sides of the flow channel cavity; the flow regulating cavity includes a transition cavity and a regulating flow channel, the regulating flow channel being laterally connected to the transition cavity, the slider including a first sealing surface and an outer surface, the longitudinal openings of the transition cavity and the regulating flow channel being disposed on the first sealing surface, and the lateral port of the regulating flow channel being located on the outer surface.

[0008] Meanwhile, the present invention also provides a reversing valve, including a valve body, a valve seat, and a slider, wherein the slider adopts the aforementioned slider technology; the valve seat is provided with valve holes spaced apart along the axial direction, the valve holes including a central hole and two side holes, the reversing valve includes a first switching direction position and a second switching direction position, and in the intermediate state between the first switching direction position and the second switching direction position, the transition chambers of the two flow regulating chambers are respectively connected to the two side holes, and the regulating flow channel connects the transition chambers with the valve chamber outside the slider.

[0009] By using this approach, a flow regulation cavity can be set on the slider, which can improve the control accuracy of the intermediate flow. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the main valve of a typical four-way directional valve. Figure 2 for Figure 1 A magnified view of a portion of region A in the middle; Figure 3 This is a schematic diagram of the main valve structure of the four-way directional valve provided by the present invention; Figure 4 This is a schematic diagram of the slider of the four-way directional valve provided by the present invention. Figure 5 A simplified structural diagram showing the left-side hole and the middle hole in a connected state when the slider and valve seat are engaged; Figure 6 for Figure 5 A simplified diagram of the structure when the middle slider moves to the right and begins to enter the intermediate flow state; Figure 7 for Figure 6 A simplified diagram of the structure when the middle slider moves to the right to the middle position; Figure 8 for Figure 7 A simplified diagram of the structure when the middle slider moves to the right and is about to leave the intermediate flow state; Figure 9 for Figure 8 A simplified diagram of the structure in which the middle slider moves to the right and the right side hole and the middle hole are connected. Figure 10 The graph shows the flow rate and slider stroke during use of the slider in the prior art and the slider provided by the present invention.

[0011] Figures 1-2 The annotations in the accompanying drawings are explained as follows: 01 Valve body, 02 Valve seat, 021 Valve hole, 03 Slider, 04 Connecting pipe, X Intermediate flow channel.

[0012] Figures 3-9 The annotations in the accompanying drawings are explained as follows: 1 Valve body, 2 Valve seat, 2a Second sealing surface, 21 Valve hole, 211 Middle hole, 212 Right side hole, 213 Left side hole, 3 Slider, 3a First sealing surface, 3b Outer surface, 31 Flow channel cavity, 32 Flow regulating cavity, 321 Transition cavity, 322 Regulating flow channel, 323 Outer port, 33 Support roller, 4 Connecting pipe, 5 Valve cavity. Detailed Implementation

[0013] 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.

[0014] The terms "first" and "second" used in this article are used only for the convenience of describing two or more structures or components that are identical or similar in structure and / or function, and do not indicate any special limitation on order and / or importance.

[0015] Please refer to Figures 3-10 , Figure 3 This is a schematic diagram of the main valve structure of the four-way directional valve provided by the present invention. Figure 4 This is a schematic diagram of the slider of the four-way directional valve provided by the present invention. Figure 5 This is a simplified structural diagram showing the left-side hole and the middle hole in a connected state when the slider and valve seat are engaged. Figure 6 for Figure 5 A simplified diagram of the structure when the middle slider moves to the right to begin entering the intermediate flow state. Figure 7 for Figure 6 A simplified diagram of the structure when the middle slider moves to the right to the middle position. Figure 8 for Figure 7 A simplified diagram of the structure when the middle slider moves to the right and is about to leave the intermediate flow state. Figure 9 for Figure 8 A simplified diagram showing the structure in which the middle slider moves to the right and the right-side hole and the middle hole are connected. Figure 10 The graph shows the flow rate and slider stroke during use of the slider in the prior art and the slider provided by the present invention.

[0016] The following description uses a four-way directional valve with a pilot valve as an example to illustrate the technology of this invention. However, the technical solution of this invention is not limited to a four-way directional valve structure; it can be applied to structures such as five-way valves or three-way valves. Similarly, the technical solution of this invention can also be used in non-piloted straight-through directional valves. Further details will not be elaborated here.

[0017] This invention relates to a four-way reversing valve, which is commonly used in air conditioning systems to change the flow direction of refrigerant, thereby enabling the switching between cooling and heating modes of the air conditioning system. However, its application is not limited to air conditioning systems.

[0018] The aforementioned four-way directional valve includes a main valve and a pilot valve, wherein, Figure 3The structure of the main valve is shown. (Example) Figure 3 As shown, the main valve includes a valve body 1, a valve seat 2, a slider 3, and a connecting pipe 4. The valve seat 2 is mounted on the valve body 1. The mounting method can be welding, or other methods, as long as the reliability and sealing requirements between the two are met. Along the axial direction of the four-way directional valve, the valve seat 2 has three valve holes 21 (see...). Figure 5 Each valve hole 21 can be connected to a connecting pipe 4. The slider 3 can slide within the valve body 1 to adjust the communication between the connecting pipes 4 and between the connecting pipes 4 and the valve body 1.

[0019] For ease of description, the three valve holes 21 can be named the middle hole 211 and the two side holes, respectively. Figures 5 to 9 From this perspective, the two side holes are the right side hole 212 and the left side hole 213, respectively. Axially, the middle hole 211 is located between the right side hole 212 and the left side hole 213. (Combined) Figure 4 In this embodiment of the invention, the slider 3 is not only provided with a flow channel cavity 31 for connecting each pipe 4, but also with two flow regulating cavities 32, which are located on opposite axial sides of the flow channel cavity 31. Figures 6-8 In the intermediate flow state, the two flow regulating chambers 32 can be connected to the two side holes respectively, and the flow regulating chambers 32 can also be connected to the outside of the slider 3 (i.e., the valve chamber 5 of the valve body 1).

[0020] During the switching process, the above-mentioned four-way directional valve includes a first switching position and a second switching position. With this scheme, when the directional valve is in the intermediate state between the first switching position and the second switching position, the magnitude of the intermediate flow is mainly determined by the shape of the flow regulating chamber 32, and the control accuracy of the intermediate flow can be improved.

[0021] Here, the shape of the flow regulating cavity 32 is not limited in this embodiment of the invention. In specific implementation, those skilled in the art can make the setting according to actual needs, as long as it can meet the requirements of use.

[0022] In one exemplary embodiment, the slider 3 has a first sealing surface 3a facing the valve seat 2 and an outer surface 3b facing the valve cavity 5. The flow regulating cavity 32 may include a transition cavity 321 and a regulating channel 322. The longitudinal openings of the transition cavity 321 and the regulating channel 322 are located on the first sealing surface 3a. The regulating channel 322 is used to communicate with the side hole in the intermediate flow state. The regulating channel 322 is laterally connected to the transition cavity 321, and the lateral port 323 of the regulating channel 322 is located on the outer surface 3b. The regulating channel 322 is used to connect the transition cavity 321 and the valve cavity outside the slider 3. That is, in the intermediate flow state, the fluid in the valve cavity outside the slider 3 can enter the transition cavity 321 through the regulating channel 322, and then enter the corresponding valve hole 21 through the transition cavity 321.

[0023] Combination Figure 4 The longitudinal cavity of the regulating channel 322 is located on the first sealing surface 3a. In practice, by designing the shape of the regulating channel 322, the maximum value of the intermediate flow rate can be adjusted.

[0024] The structure of the regulating channel 322 can be varied. In this embodiment of the invention, the cross-section of the regulating channel 322 perpendicular to its extension direction can be set as a rectangle. This type of regulating channel 322 is simple to process, and in practice, only the length and width of the rectangle need to be changed to adjust the maximum value of the intermediate flow rate, which facilitates the improvement of control accuracy.

[0025] Here, the embodiments of the present invention do not limit the number of regulating channels 322. In practice, those skilled in the art can set them according to actual needs, as long as the requirements of the set intermediate flow curve can be met.

[0026] In some optional embodiments, the first sealing surface 3a may have a central axis along the axial direction, and the number of adjusting channels 322 may be even. Each adjusting channel 322 may be axially symmetrically arranged about the central axis, thus making the distribution of the adjusting channels 322 more uniform and improving the stability of the slider 3 within the valve body 1. Combined with... Figure 4 In the embodiment shown in the attached figure, each transition cavity 321 may be configured with two regulating channels 322.

[0027] Combination Figure 7 and Figure 8 The slider 3 has a dimension L3 on the central axis. The distance between the left end of the left hole 213 and the right end of the right hole 212 on the central axis is L2. The distance between the left end of the left transition cavity 321 and the right end of the right transition cavity 321 on the central axis is L1. The valve seat 2 has a second sealing surface 2a facing the slider 3. In practice, L3 can be set to be greater than L2, such as... Figure 7As shown, when the slider 3 slides to the intermediate position, the projection contour of the first sealing surface 3a onto the second sealing surface 2a can enclose the three valve ports 21, so that the two side holes can only form an intermediate flow rate with the inner cavity of the valve body 1 through the flow regulating cavity, so as to precisely control the maximum value of the intermediate flow rate; moreover, the dimensions of L1 and L2 can also be adjusted, so as to adjust the curve shape of the intermediate flow rate.

[0028] Please continue to refer to Figure 5 , the first sealing surface 3a has an axial central axis, on the central axis, the dimension of the transition cavity 321 is B1, the dimension of the region of the first sealing surface 3a between the flow passage cavity 31 and the transition cavity 321 is B2, and B1<B2. With such an arrangement, the dimension of the transition cavity 321 can be relatively small, and the structural strength of the slider 3 can be relatively high.

[0029] The side of the valve seat 2 facing the slider 3 may be the second sealing surface 2a, the second sealing surface 2a has a right side region on the axial right side of the right side hole 212, and the second sealing surface 2a has a left side region on the axial left side of the left side hole 213, both the right side region and the left side region may be referred to as side regions. The projection of the transition cavity 321 onto the second sealing surface 2a can completely fall into the side region, or it can also be said that the projection of the side region onto the first sealing surface 3a can cover the flow regulating cavity 32; in this way, during the displacement process of the slider 3, there are moments (from Figure 5 the state in Figure 6 to the state in and from Figure 8 the state in to Figure 9 the state in), the side region of the second sealing surface 2a can block the transition cavity 321, so as to prevent the transition cavity 321 from directly communicating the side holes with the outer side of the slider 3.

[0030] In a specific embodiment, in combination with Figure 5 , the dimension of the side region of the second sealing surface 2a on the central axis is C, C≥B2, and correspondingly, C>B1. This can avoid the situation that the transition cavity 321 communicates the side holes with the outer side of the slider 3 at the same time.

[0031] Further, the slider 3 is further provided with a support roller 33, and the support roller 33 is installed in the flow passage cavity 31, for improving the structural strength of the slider 3.

[0032] In combination with Figure 10 , it is verified by tests that after adopting the slider 3 provided by the embodiment of the present invention, the intermediate flow rate curve is more gentle, which can reduce the pressure fluctuation during the movement of the slider 3, and further improve the smoothness of commutation, so as to reduce the jitter noise of the slider 3.

[0033] As shown in Figures 5-9As shown, the connection state of the four-way directional valve changes during the movement of slider 3. Figure 5 In the shown state, the left hole 213 can be connected to the middle hole 211 through the flow channel cavity 31, and the right hole 212 is directly connected to the inner cavity of the valve body 1. When the slider 3 moves from... Figure 5 Move to the middle state Figure 6 In the intermediate state, the flow regulating chamber 32 on the left side can connect the left hole 213 and the inner cavity of the valve body 1, and the intermediate flow begins to appear. When the slider 3 moves from... Figure 6 Move to the middle state Figure 7 In the intermediate state, slider 3 can be approximately in the middle position axially, the three valve holes 21 can be interconnected, the left flow regulating chamber 32 can connect the left hole 213 and the inner cavity of valve body 1, and the right flow regulating chamber 32 can connect the right hole 212 and the inner cavity of valve body 1. At this time, the four-way directional valve has the maximum intermediate flow. When slider 3 moves from... Figure 7 Move to the middle state Figure 8 In the intermediate state, the intermediate flow is about to disappear. When slider 3 moves from... Figure 8 Move to the middle state Figure 9 In the middle state, the right hole 212 can be connected to the middle hole 211 through the flow channel cavity 31, and the left hole 213 can be directly connected to the inner cavity of the valve body 1.

[0034] As a further optimization, after the reversing valve is assembled, in the state where the second sealing surface 2a abuts against the first sealing surface 3a, the equivalent flow area of ​​the regulating channel 322 is smaller than the equivalent flow area of ​​the transition cavity 321. This design controls the intermediate flow rate by adjusting the design of the flow channel 322, and the transition cavity 321 acts as a buffer cavity in the middle of the fluid, reducing fluid fluctuations and making the reversing process smoother.

[0035] 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. A slider, characterized in that: The slider (3) is provided with a flow channel cavity (31) and two flow regulating cavities (32), and the two flow regulating cavities (32) are respectively located on both sides of the axial direction of the flow channel cavity (31); the flow regulating cavity (32) includes a transition cavity (321) and a regulating flow channel (322), the regulating flow channel (322) is laterally connected to the transition cavity (321), the slider (3) includes a first sealing surface (3a) and an outer surface (3b), the longitudinal openings of the transition cavity (321) and the regulating flow channel (322) are provided on the first sealing surface (3a), and the lateral port (323) of the regulating flow channel (322) is located on the outer surface (3b).

2. The slider according to claim 1, characterized in that, The cross-section of the regulating channel (322) perpendicular to its extension direction is rectangular.

3. The slider according to claim 1, characterized in that, The first sealing surface (3a) has a central axis along the axial direction, and the number of the regulating channels (322) is even, with each regulating channel (322) arranged axially symmetrically about the central axis.

4. The slider according to claim 3, characterized in that, Each of the aforementioned transition cavities (321) is equipped with two of the aforementioned regulating channels (322).

5. The slider according to any one of claims 1-4, characterized in that, The first sealing surface (3a) has a central axis along the axial direction, on which the dimension of the transition cavity (321) is B1, and the dimension of the area of ​​the first sealing surface (3a) between the flow channel cavity (31) and the transition cavity (321) is B2. <B2。 6. The slider according to any one of claims 1-4, characterized in that, It also includes a support roller (33), which is installed inside the flow channel cavity (31).

7. A directional control valve, comprising a valve seat (2) and a slider (3), characterized in that, The slider (3) is the slider according to any one of claims 1-6; The valve seat (2) is provided with valve holes (21) spaced apart along the axial direction of the reversing valve. The valve holes (21) include a central hole (211) and two side holes. The reversing valve includes a first switching position and a second switching position. When the reversing valve is in the intermediate state between the first switching position and the second switching position, the transition chambers (321) of the two flow regulating chambers (32) can be connected to the two side holes respectively. The regulating flow channel (322) connects the transition chamber (321) with the valve chamber (5) outside the slider (3).

8. The reversing valve according to claim 7, characterized in that, The valve seat (2) has a second sealing surface (2a) facing the slider (3), the projection of the second sealing surface (2a) onto the first sealing surface (3a) can cover the flow regulating cavity (32), and the outer contour of the projection of the first sealing surface (3a) onto the second sealing surface (2a) can surround the three valve holes (21).

9. The reversing valve according to claim 8, characterized in that, When the second sealing surface (2a) is in contact with the first sealing surface (3a), the equivalent flow area of ​​the regulating channel (322) is smaller than the equivalent flow area of ​​the transition cavity (321).

10. The reversing valve according to claim 8, characterized in that, The first sealing surface (3a) has a central axis along the axial direction. On the central axis, the size of the area of ​​the first sealing surface (3a) between the flow channel cavity (31) and the transition cavity (321) is B2, and the size of the side area of ​​the second sealing surface (2a) on both sides of the valve hole (21) is C, where C≥B2.

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