Reversing valve

Abstract

The invention provides a reversing valve which comprises a valve element component, the valve element component comprises a valve element and a throttling component, the throttling component comprises a shielding part which is defined on a horizontal projection plane parallel to the sliding direction of the valve element component, the area defined by the projection outline of the shielding part is Q, the area defined by the projection outline of a first valve port is Q1, and the area defined by the projection outline of a second valve port is Q; areas defined by projection contours of a first port of the first inlet channel and a first port of the second inlet channel are Q21 and Q22 respectively; when the valve element part is located in the middle position area, the conditions that Q1 and Q21 have an overlapping area, and the area is defined as A1; q1 and Q22 have an overlapping region, and the region is defined as A2; the Q part covers A1, and the Q part covers A2. According to the reversing valve, the flexibility in the reversing process can be improved, the throttling component is easy to machine, and flow control is facilitated.

Description

[0001] This application is a divisional application of the Chinese invention patent application No. 202211071481.6, filed on September 2, 2022, with the title of "A reversing valve". TECHNICAL FIELD

[0002] The present application relates to the technical field of fluid control, in particular to a reversing valve. BACKGROUND

[0003] Reversing valves are widely used in the field of fluid control. For example, a reversing valve used in a heat pump air conditioning system can realize the reversing of the medium flow path in both cooling and heating modes. With the development of industrial technology and the improvement of people's living needs, large-capacity reversing valves are increasingly used in heat pump air conditioning systems. For example, a four-way reversing valve is disclosed in the patent with the publication number CN202056350U. In this technology, a valve core component with a whole circular structure is provided, which slides in a cylindrical valve cavity to switch the flow path. In the above background technology, the reversing performance of the reversing valve in the reversing process has room for improvement. SUMMARY

[0004] To this end, the present application provides a reversing valve, which comprises a valve body component and a valve core component. The valve core component comprises a valve core, which comprises a first outer wall part and a second outer wall part. The valve core comprises a first inlet channel, a second inlet channel, a first reversing channel and a second reversing channel. The first port of the first inlet channel and the first port of the second inlet channel are respectively located on the first outer wall part. The first port of the first reversing channel and the first port of the second reversing channel are respectively located on the second outer wall part.

[0005] The valve body component comprises a valve body, which comprises a first inner wall part and a second inner wall part. The first inner wall part is arranged opposite to the first outer wall part, and the second inner wall part is arranged opposite to the second outer wall part. The valve body further comprises a first valve port, a second valve port, a third valve port and a fourth valve port. The first valve port is located on the first inner wall part, and the second valve port is located on the second inner wall part.

[0006] When the valve core component is located at a first reversing position, the first inlet channel is in communication with the first valve port and the third valve port, the first reversing channel is in communication with the second valve port and the fourth valve port, and the first inlet channel is not in communication with the first reversing channel.

[0007] When the valve core component is located at a second reversing position, the second inlet channel is in communication with the first valve port and the fourth valve port, the second reversing channel is in communication with the second valve port and the third valve port, and the second inlet channel is not in communication with the second reversing channel.

[0008] The valve core component further includes a throttle component, which is fixedly connected or limit-connected to the valve core. The throttle component includes a shielding portion, which is defined on a horizontal projection plane parallel to the sliding direction of the valve core component. The area defined by the projection outline of the shielding portion is Q, the area defined by the projection outline of the first valve port is Q1, and the areas defined by the projection outlines of the first port of the first inlet channel and the first port of the second inlet channel are Q21 and Q22, respectively.

[0009] The area where the first inlet channel, the second inlet channel, the first reversing channel and the second reversing channel are interconnected when the valve core component is located between the first reversing position and the second reversing position is defined as the intermediate position area. When the valve core component is located in the intermediate position area, the following conditions are satisfied: Q1 and Q21 have an overlapping area and the area is defined as A1; Q1 and Q22 have an overlapping area and the area is defined as A2; the Q portion covers A1, and the Q portion covers A2.

[0010] The reversing valve provided by the present invention has a blocking portion arranged on the throttling component. When the valve core component is located in the middle position area, the flow rate of the fluid entering the reversing valve is preset to improve the flexibility of the reversing valve during the reversing process. The throttling component is simple to process and facilitates flow control. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 : A structural schematic diagram of a reversing valve provided by the present invention;

[0012] Figure 2 : Figure 1 Schematic diagram of the local structure of the reversing valve in the middle position area;

[0013] Figure 3 : Figure 1 The three-dimensional structure diagram of the valve body components;

[0014] Figure 4 : Figure 1 Three-dimensional structure diagram of the middle valve core;

[0015] Figure 5 A / 5B / 5C: Figure 1 The main view of the throttle plate of three specific structures;

[0016] Figure 6 : A projection diagram of the reversing valve at a first reversing position, perpendicular to the sliding direction of the valve core component;

[0017] Figure 7 : A projection diagram of the reversing valve at a second reversing position, perpendicular to the sliding direction of the valve core component;

[0018] Figure 8 Fig. 5 is a schematic view of the coverage relationship on the horizontal projection plane parallel to the sliding direction of the spool member when the throttle plate, the first valve port, and the inlet passage port are at different positions;

[0019] Figure 9 Fig. 6 is a schematic view of the effect of an optimized reversing process using the present technology.

[0020] Figures 1-9 Symbol explanation:

[0021] 1 - reversing valve, 2 - pilot valve;

[0022] 10 - valve body member;

[0023] 100 - valve body;

[0024] 110 - first inner wall portion, 111 - first valve port;

[0025] 120 - second inner wall portion, 121 - second valve port;

[0026] 130 - third inner wall portion, 131 - third valve port;

[0027] 140 - fourth inner wall portion, 141 - fourth valve port;

[0028] 150 - square portion, 151 - square cavity;

[0029] 210 - first cover;

[0030] 212 - first piston cavity;

[0031] 220 - second cover;

[0032] 222 - second piston cavity;

[0033] 310 - first connecting pipe, 320 - second connecting pipe;

[0034] 330 - third connecting pipe, 340 - fourth connecting pipe;

[0035] 40 - valve body member;

[0036] 400 - spool;

[0037] 410 - first outer wall portion, 420 - second outer wall portion;

[0038] 430 - third outer wall portion, 440 - fourth outer wall portion;

[0039] 450 - first inlet passage;

[0040] 451 - first end port of the first inlet passage, 452 - second end port of the first inlet passage;

[0041] 460 - second inlet channel;

[0042] 461 - first port of the second inlet channel, 462 - second port of the second inlet channel;

[0043] 470 - first diverting channel;

[0044] 471 - first port of the first diverting channel, 472 - second port of the first diverting channel;

[0045] 480 - second diverting channel;

[0046] 481 - first port of the second diverting channel, 482 - second port of the second diverting channel;

[0047] 491 - first end, 492 - second end;

[0048] 50 - throttling member;

[0049] 500 - throttle plate;

[0050] 510 - throttling portion;

[0051] 511 - blocking portion;

[0052] 520 - mounting portion;

[0053] 521 - first side portion, 522 - second side portion;

[0054] 610 - first piston, 620 - second piston;

[0055] 630 - first connecting rod, 640 - second connecting rod;

[0056] 80 - valve cavity;

[0057] 900 - balancing channel;

[0058] 910 - groove segment, 911 - longitudinal protrusion. DETAILED DESCRIPTION

[0059] In order to make the technical solution of the present application better understood by those skilled in the art, the present application will be further described in detail below in combination with the drawings and specific embodiments. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can also be obtained from these drawings without creative labor for those skilled in the art. The orientation words such as up, down, etc. involved herein are defined by the positions of the parts shown in the drawings relative to each other, and are only for the purpose of expressing the clarity and convenience of the technical solution. It should be understood that the orientation words used herein should not limit the scope of the present application.

[0060] Figure 1 Fig. 1 is a schematic view of a reversing valve according to the present application, Figure 2 Fig. 2 is a schematic view of a reversing valve according to the present application, Figure 1 Fig. 3 is a schematic view of a reversing valve according to the present application, Figure 3 Fig. 4 is a schematic view of a reversing valve according to the present application, Figure 1 Fig. 5 is a schematic view of a reversing valve according to the present application, Figure 4 Fig. 6 is a schematic view of a reversing valve according to the present application, Figure 1 Fig. 7 is a schematic view of a reversing valve according to the present application, Figure 5 Fig. 8 is a schematic view of a reversing valve according to the present application, Figure 1 Fig. 9 is a schematic view of a reversing valve according to the present application, Figure 6 Fig. 10 is a schematic view of a reversing valve according to the present application, Figure 7 Fig. 11 is a schematic view of a reversing valve according to the present application.

[0061] Figure 1 Figure 3 Fig. 1 is a schematic view of a reversing valve according to the present application, Figure 4 Fig. 2 is a schematic view of a reversing valve according to the present application,

[0062] Fig. 3 is a schematic view of a reversing valve according to the present application,

[0063] Fig. 4 is a schematic view of a reversing valve according to the present application, Figure 6 Figure 7 Fig. 5 is a schematic view of a reversing valve according to the present application,

[0064] ​​Four rectangular cavities 151 with substantially vertical inner walls are formed within the rectangular body 150. A cylindrical first piston cavity 212 is formed within the tubular portion of the first cover 210, and a cylindrical second piston cavity 222 is formed within the tubular portion of the second cover 220. The rectangular cavities 151, the first piston cavity 212, and the second piston cavity 222 constitute the valve cavity 80.

[0065] The valve core component 40 includes a valve core 400, a first connecting rod 630, a second connecting rod 640, a first piston 610, and a second piston 620. The first piston 610 is fixedly connected to the valve core 400 via the first connecting rod 630; the second piston 620 is fixedly connected to the valve core 400 via the second connecting rod 640. The first piston 610 is located in the first piston chamber 212, the second piston 620 is located in the second piston chamber 222, and the valve core 400 is located in the square chamber 151. By reversing the flow path of the pilot valve 2, the pressure difference between the outer sides of the first piston 610 and the second piston 620 is changed, which can drive the valve core component 40 to slide in the valve chamber 80.

[0066] Corresponding to the valve body 100, the valve core 400 has a square projection on a projection plane perpendicular to the sliding direction of the valve core component 40. The valve core 400 includes a first outer wall portion 410 and a second outer wall portion 420 arranged horizontally, and a third outer wall portion 430 and a fourth outer wall portion 440 arranged longitudinally.

[0067] like Figure 2 、 Figure 5 、 Figure 6 and Figure 7 As shown, and refer to Figure 1 The first outer wall portion 410 is located at the upper end of the valve core 400, and the second outer wall portion 420 is located at the lower end of the valve core 400. The first outer wall portion 410 is disposed opposite the first inner wall portion 110, the second outer wall portion 420 is disposed opposite the second inner wall portion 120, the third outer wall portion 430 is disposed opposite the third inner wall portion 130, and the fourth outer wall portion 440 is disposed opposite the fourth inner wall portion 140.

[0068] like Figure 6 、 Figure 7 As shown, and refer to Figure 1 and Figure 4The valve core 400 is provided with a first inlet channel 450 and a second inlet channel 460, which are spaced apart in the longitudinal direction of the valve core 400. The valve core 400 is also provided with a first reversing channel 470 and a second reversing channel 480, which are spaced apart in the longitudinal direction of the valve core 400. The first port 451 of the first inlet channel and the first port 461 of the second inlet channel are respectively located on the first outer wall portion 410; the second port 452 of the first inlet channel is located on the third outer wall portion 430, and the second port 462 of the second inlet channel is located on the fourth outer wall portion 440. The first port 47 of the first reversing channel and the first port 481 of the second reversing channel are respectively located on the second outer wall portion 420; the second port 472 of the first reversing channel is located on the fourth outer wall portion 440, and the second port 482 of the second reversing channel is located on the third outer wall portion 430.

[0069] like Figure 2 and Figure 5 As shown, and refer to Figure 1 、 Figure 6 and Figure 7 The valve core component 40 further includes a throttle component 50 , and the throttle component 500 is fixedly connected or position-limitedly connected to the valve core 400 .

[0070] The throttle component 50 includes a throttle plate 500, which is generally in the shape of an I-shaped element and includes a central throttle portion 510 and mounting portions 520 located on both sides of the throttle portion 510. The throttle portion 510 includes a shielding portion 511. The mounting portion 520 includes a first side portion 521 and a second side portion 522.

[0071] The upper end of the valve core 400 includes transversely extending longitudinal protrusions 911 on both sides, with a groove 910 formed in the middle of the longitudinal protrusions 911. The throttle plate 500 is inserted into the groove 910, and the first side portion 521 and the second side portion 522 are respectively engaged with the longitudinal protrusions 911. The throttle plate 500 and the valve core 400 can be made of metal and fixed by welding.

[0072] As a further design extension, to avoid the high pressure fluid in the valve cavity 80 to generate resistance when the valve core component 40 slides, improve the flexibility of the valve core component 40 sliding movement, a flow gap is formed between the first inner wall 110 of the valve body 100 and the upper end of the throttle plate 500. The flow gap serves as a balance channel 900, which extends longitudinally into the valve cavity 80 outside the first end 491 and the second end 492 of the valve core. The balance channel 900 communicates with the first valve port 111, and the high pressure fluid of the first valve port 111 on both sides is balanced when the valve core component 40 slides. Of course, as an alternative technical solution, the balance channel 900 can also be arranged between the first outer wall 410 of the valve core 400 and the lower end of the throttle plate 500.

[0073] Referring to Figure 1 and Figure 6 When the valve core component 40 is in the first switching position, the first port 451 of the first inlet channel communicates with the first valve port 111, and the second port 452 of the first inlet channel communicates with the third valve port 131; the first port 471 of the first switching channel communicates with the second valve port 121, and the second port 472 of the first switching channel communicates with the fourth valve port 141; the first inlet channel 450 does not communicate with the first switching channel 470.

[0074] Referring to Figure 1 and Figure 7 When the valve core component 40 is in the second switching position, the first port 461 of the second inlet channel 460 communicates with the first valve port 111, and the second port 462 of the second inlet channel communicates with the fourth valve port 141; the first port 481 of the second switching channel communicates with the second valve port 121, and the second port 482 of the second switching channel communicates with the third valve port 131; the second inlet channel 460 does not communicate with the second switching channel 480.

[0075] Referring to Figure 2 To reduce the overall volume of the switching valve 1, the longitudinal length of the valve core component 40 sliding is as short as possible (i.e. shorten the sliding distance between the first switching position and the second switching position). In this way, the valve core component 400 is located in a region between the first switching position and the second switching position, and the first inlet channel 450, the second inlet channel 460, the first switching channel 470 and the second switching channel 480 are connected to each other in this region, which is defined as the intermediate position region. In this region, the first inlet channel 450 and the second inlet channel 460 simultaneously communicate with the first valve port 111 and the second valve port 121, and the first switching channel 470 and the second switching channel 480 simultaneously communicate with the third valve port 131 and the second valve port 141. Therefore, the related ports are in a serial state. When the valve core component 400 is in this region, the pressure fluid flowing from the first valve port 111 will have a pressure loss, and if the pressure loss is too large, it will affect the flexibility of the switching valve switching.

[0076] The technical solution provided by the present application is that, in the intermediate position region, the valve core component 40 partially blocks the first port 451 of the first inlet channel through the first blocking part 511 of the throttling part 510 and partially blocks the first port 461 of the second inlet channel through the second blocking part 512, so that the flow of high-pressure fluid from the first valve port 111 into the valve cavity 80 can be controlled, the pressure loss is reduced, and the reversing process is smooth and flexible.

[0077] Figure 8 The figure is a schematic diagram of the coverage relationship in different positions of the throttling plate, the first valve port and the port of the inlet channel on the horizontal projection plane parallel to the sliding direction of the valve core component.

[0078] As shown in Figure 8 , and referring to Figure 1 and Figure 5 A. In the horizontal projection plane parallel to the sliding direction of the valve core component, the area defined by the projection contour of the blocking part 51 is Q, the area defined by the projection contour of the first valve port 111 is Q1, and the areas defined by the projection contours of the first port 451 of the first inlet channel and the first port 461 of the second inlet channel are Q21 and Q22, respectively.

[0079] When the valve core component 40 is in the intermediate position region (see Figure 8 C), Q1 and Q21 have an overlapping area A1, Q1 and Q22 have an overlapping area A2, and Q partially covers A1 and A2 (both included in the coverage areas B1 and B2 and the non-coverage areas C1 and C2, A1=B1+C1, A2=B2+C2).

[0080] The beneficial effect of this technical solution is that, in the intermediate position region, the first valve port 111 flows into the valve cavity through the C1 area and the C2 area, reducing the flow (if no blocking part is provided, the first valve port 111 flows into the valve cavity through the A1 area and the A2 area).

[0081] As a further technical solution, by providing different structural forms of the blocking part 51, the shapes of the different cross-sectional contours of the areas A1, A2, C1 and C2 can be adjusted, the flow variation process of the fluid flowing into the first valve port 111 in the intermediate position region can be pre-designed and optimized, and the reversing performance of the reversing valve 1 is improved. Moreover, the throttling component is simple to process and facilitates flow control.

[0082] Figure 9 The figure is an effect diagram of an optimized reversing process using the technology of the present application.

[0083] As can be seen from the figure, the optimized intermediate flow variation is smooth, which is beneficial to improve the reversing flexibility of the reversing valve.

[0084] As a further technical solution extension, as defined: when the valve core component 40 is located in the intermediate position area, the fluid flow from the first valve port 111 is W1, when the valve core component 40 is located in the first reversing position, the fluid flow from the first valve port 111 is W21, and when the valve core component 40 is located in the second reversing position, the fluid flow from the first valve port 111 is W22, then it satisfies: W1≤20%×W21, W1≤20%×W22. That is, in this optimized solution, the maximum fluid flow in the intermediate flow area is less than 20% of the steady-state fluid flow.

[0085] As a further technical solution extension, as defined: the sum of the area of C1 and C2 is V, and the area of Q1 is S1, then it satisfies: V≤20%×S1.

[0086] As a further technical solution extension, in Figure 5 The two side surfaces of the throttling part 510A in A include arc-shaped surfaces, and the arc-shaped surface area is the shielding part 511A. In Figure 5 The two side surfaces of the throttling part 510B in B include symmetrically arranged angular surfaces, and the angular surface area is the shielding part 511B. In Figure 5 The two side surfaces of the throttling part 510C in C are straight surfaces, and the straight surface area is the shielding part 511C.

[0087] As a further technical solution extension, as Figure 8 A, Figure 8 B. When the valve core component 40 is located in the first reversing position, Q21 and Q are tangent without overlapping; when the valve core component 40 is located in the second reversing position, Q22 and the Q are tangent without overlapping. Such arrangement is to prevent the throttling plate 550 from protruding from the flow passage and increasing the flow resistance in the stable state of the reversing valve during the reversing process.

[0088] As a further extension of the above technical solution, to improve the smoothness of fluid change during the reversing process, as defined: the area of Q1 is S1, the area of Q21 is S21, and the area of Q22 is S22, then it satisfies: 1.1×S1≤S21≤1.3×S1; 1.1×S1≤S22≤1.3×S1.

[0089] The above application of specific examples has described the principles and implementation modes of the present application. The above example is only used to help understand the technical solutions and core ideas of the present application. It should be noted that for ordinary technical personnel in the technical field, without departing from the principles of the present application, the present application can be improved and modified. These improvements and modifications also fall within the protection scope of the present application.

Claims

1. A reversing valve comprising a valve body member having a valve cavity and a valve spool member located in the valve cavity, characterised in that, The valve core component comprises a valve core, the valve core comprises a first outer wall part and a second outer wall part, the valve core comprises a first inlet channel, a second inlet channel, a first reversing channel and a second reversing channel, a first port of the first inlet channel and a first port of the second inlet channel are respectively located at the first outer wall part, a first port of the first reversing channel and a first port of the second reversing channel are respectively located at the second outer wall part; The valve body component comprises a valve body, the valve body comprises a first inner wall part and a second inner wall part, the first inner wall part is oppositely arranged with the first outer wall part, and the second inner wall part is oppositely arranged with the second outer wall part, the valve body further comprises a first valve port, a second valve port, a third valve port and a fourth valve port, the first valve port is located at the first inner wall part, and the second valve port is located at the second inner wall part; When the valve core component is located at the first reversing position, the first inlet channel is communicated with the first valve port and the third valve port, the first reversing channel is communicated with the second valve port and the fourth valve port, and the first inlet channel is not communicated with the first reversing channel; When the valve core component is located at the second reversing position, the second inlet channel is communicated with the first valve port and the fourth valve port, the second reversing channel is communicated with the second valve port and the third valve port, and the second inlet channel is not communicated with the second reversing channel; The valve core component further comprises a shielding part, the shielding part is located between the first port of the first inlet channel and the first valve port, and a projection profile of the shielding part defines an area Q, a projection profile of the first valve port defines an area Q1, and the Q and the Q1 both have an overlapping area when the valve core component is located at the first reversing position and the second reversing position.

2. The reversing valve of claim 1, wherein An upper end part of the valve core comprises a groove part, a side wall of the groove part is limitedly matched with the first side part and the second side part, a balance channel is arranged between the first inner wall part and the throttling part, and the balance channel is communicated with the first valve port and the valve cavity.

3. The reversing valve of claim 2, wherein A projection profile of the valve core on a projection plane perpendicular to a sliding direction of the valve core component is square, the valve core further comprises a third outer wall part and a fourth outer wall part, a second port of the first inlet channel is located at the third outer wall part, and a second port of the second inlet channel is located at the fourth outer wall part; the valve body further comprises a third inner wall part and a fourth inner wall part, the third inner wall part is oppositely arranged with the third outer wall part, and the fourth inner wall part is oppositely arranged with the fourth outer wall part, the third valve port is located at the third inner wall part, and the fourth valve port is located at the fourth inner wall part.

4. A reversing valve according to any one of claims 1-3, characterized in that The valve body component further comprises a first cover body and a second cover body, the first cover body and the second cover body are threadedly connected or weldedly connected with the valve body; the valve core component comprises a valve core, a first connecting rod, a second connecting rod, a first piston and a second piston, the first piston is connected with the valve core through the first connecting rod, and the second piston is connected with the valve core through the second connecting rod; The valve cavity comprises a first piston cavity and a second piston cavity, the first cover comprises the first piston cavity, the second cover comprises the second piston cavity, the first piston is located in the first piston cavity, and the second piston is located in the second piston cavity.

5. The reversing valve of claim 4, wherein The projection profiles of the first ports of the first inlet channel and the first ports of the second inlet channel define areas Q21 and Q22, respectively; An intermediate position area is defined as an area in which the first inlet channel, the second inlet channel, the first switching channel, and the second switching channel are interconnected when the spool component is located between the first switching position and the second switching position, and when the spool component is located in the intermediate position area, the following conditions are met: the Q1 and the Q21 have an overlapping area, which is defined as A1; the Q1 and the Q22 have an overlapping area, which is defined as A2; the Q partially covers the A1, and the Q partially covers the A2. When the spool component is located in the first switching position, the Q21 and the Q have no overlapping area, and when the spool component is located in the second switching position, the Q22 and the Q have no overlapping area.

6. The reversing valve of claim 5, wherein As defined, the area of the Q1 is S1, the area of the Q21 is S21, and the area of the Q22 is S22, and the following conditions are met: 1.1×S1≤S21≤1.3×S1; 1.1×S1≤S22≤1.3×S1.

7. The reversing valve of claim 5, wherein As defined, when the spool component is located in the intermediate position area, the fluid flow from the first valve port is W1; when the spool component is located in the first switching position, the fluid flow from the first valve port is W21, and when the spool component is located in the second switching position, the fluid flow from the first valve port is W22, and the following conditions are met: W1≤20%×W21, W1≤20%×W22.

8. The diverter valve of claim 5, wherein, As defined, when the spool component is located in the intermediate position area, the area of the Q that is not covered by the A1 is C1, the area of the Q that is not covered by the A2 is C2, the sum of the areas of the C1 and the C2 is V, and the area of the Q1 is S1, and the following conditions are met: V≤20%×S1.

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