Double-return-valve structure

Abstract

The utility model discloses a double return valve structure which comprises a valve body, a valve rod, a first valve bonnet, a second valve bonnet and a dynamic seal, and the valve body is provided with a first valve cavity, a second valve cavity, a third valve cavity, an inlet, a first outlet and a second outlet. A first bonnet is arranged at the part of the valve rod in the first valve cavity; a second bonnet is arranged at the part of the valve rod in the third valve cavity; the reciprocating motion of the valve rod drives the first valve bonnet and the second valve bonnet to move, and when the valve rod moves to enable the first valve bonnet to block the communication position of the first valve cavity and the second valve cavity, the second valve bonnet releases the communication position of the second valve cavity and the third valve cavity. On the contrary, when the valve rod moves to enable the first valve bonnet to release the communicating position of the first valve cavity and the second valve cavity, the second valve bonnet blocks the communicating position of the second valve cavity and the third valve cavity; the first outlet or the second outlet is switched for backflow through reciprocating motion of the valve rod, the device is suitable for coating backflow pressures with different gaps, backflow of the gaps can be controlled respectively, and the surface density of the head of the pole piece can be rapidly adjusted.

Description

Technical Field

[0001] This utility model belongs to the field of lithium battery manufacturing, specifically relating to a double reflux valve structure for use in double-gap coating reflux of a coating machine. Background Technology

[0002] Coating is a crucial process in the production of lithium-ion battery electrodes. Depending on the arrangement of the electrode tabs, coating methods can be selected, including gap coating or continuous coating. Gap coating is used to reserve space for the tabs in the blank areas. Currently, the main gap coating methods are single-gap coating and double-gap coating.

[0003] For dual-gap coating technology, there is generally one large gap and one small gap. The different lengths of the two gaps result in different slurry recirculation times for the large and small gaps, leading to different pressures in the recirculation pipeline and coating valve cavity. The original dual-gap coating method involved opening the coating valve and closing the recirculation valve during coating, and opening the recirculation valve and closing the coating valve during the gap. Two gaps of different sizes shared a single recirculation valve. One recirculation valve could only correspond to one recirculation channel, and a diaphragm valve was used to control the recirculation pressure. Because the large and small gaps were different in size, there was inconsistency in the recirculation flow rate and pressure between the two gaps. This resulted in a significant difference in the surface density of the electrode heads in the two gaps, and the surface density of the electrode heads was difficult to adjust and fluctuated greatly. Utility Model Content

[0004] This utility model addresses the shortcomings described in the prior art by providing a dual reflux valve structure, enabling the original reflux valve to correspond to two reflux channels, thus facilitating the setting of reflux channels for different gap sizes.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A dual reflux valve structure includes a valve body and a valve stem, and further includes a first valve cap, a second valve cap, and a dynamic seal. The valve body has a first valve chamber, a second valve chamber, a third valve chamber, an inlet, a first outlet, and a second outlet. The first, second, and third valve chambers are interconnected. The second valve chamber is located between the first and third valve chambers, and the inner diameter of the second valve chamber is smaller than the inner diameters of the first and third valve chambers. The inlet communicates with the second valve chamber. The first outlet communicates with the first valve chamber. The second outlet communicates with the third valve chamber.

[0007] One end of the valve stem passes through the third and second valve chambers and is located in the first valve chamber. The other end of the valve stem passes through the dynamic seal at the third valve chamber and is exposed in the valve body. The valve stem reciprocates within the valve body. The reciprocating motion of the valve stem drives the first and second valve caps to move. When the valve stem moves and the first valve cap blocks the connection between the first and second valve chambers, the second valve cap releases the connection between the second and third valve chambers. Conversely, when the valve stem moves and the first valve cap releases the connection between the first and second valve chambers, the second valve cap blocks the connection between the second and third valve chambers.

[0008] The portion of the valve stem located within the first valve chamber is provided with a first valve cap, the outer diameter of which is smaller than the inner diameter of the first valve chamber and larger than the inner diameter of the second valve chamber; the portion of the valve stem located within the third valve chamber is provided with a second valve cap, the outer diameter of which is smaller than the inner diameter of the third valve chamber and larger than the inner diameter of the second valve chamber.

[0009] In a preferred embodiment of this utility model, the first valve cap is detachably mounted on the valve stem. This detachable mounting facilitates valve stem installation and allows adjustment of the valve stem's stroke by changing the position of the first valve cap on the valve stem. When the valve body is a one-piece structure, an opening is provided at the top of the first valve cavity; after installing the first valve cap, the opening is sealed with an end cap. When the valve body is a split structure, the valve stem and the first valve cap are assembled first, and then the uppermost first valve body is assembled.

[0010] As a preferred embodiment of this utility model, the first valve cap and the valve stem are threaded together; in order to prevent the first valve cap from moving up and down, a valve cap fixing nut is threadedly installed on the valve stem above the first valve cap.

[0011] In a preferred embodiment of this utility model, the valve body includes a first valve body, a second valve body, and a third valve body. A first valve cavity and a first outlet are located in the first valve body; an inlet and a second valve cavity are located in the second valve body; and a second outlet and a third valve cavity are located in the third valve body. The first, second, and third valve bodies are fixed together with bolts. The first valve cavity is closed at the top and open at the bottom, with its side communicating with the first outlet. The second valve cavity is a through hole, and an inlet is provided on the side wall of the second valve body, communicating with both the second and third valve cavities and the discharge port of the original reflux valve. The third valve cavity is also a through hole, and a second outlet is provided on the side wall of the third valve body, communicating with the third valve cavity. The first, second, and third valve bodies are ultimately fixed together with bolts.

[0012] As a preferred embodiment of this utility model, sealing rings are provided at the contact parts of the first valve body and the second valve body, and at the contact parts of the second valve body and the third valve body. After the valve body is assembled in a split structure, sealing rings are installed at the contact parts of each pair to prevent material leakage.

[0013] In a preferred embodiment of this invention, a valve seat is installed within the cavity of the second valve body. The channel of the valve seat serves as the second valve chamber, and the valve seat has a connection port communicating with the inlet. The inner diameter of the second valve chamber is the smallest compared to the first and third valve chambers. The cavity of the second valve body can be directly made into a channel with a small inner diameter, or the inner diameter of the channel can be changed by installing a valve seat, using the channel of the valve seat as the second valve chamber.

[0014] In a preferred embodiment of this invention, a retaining ring is provided on the inner wall of the cavity of the second valve body, and the retaining platform of the valve seat abuts against the retaining ring to confine the valve seat within the second valve body. To ensure stable installation of the valve seat, a retaining ring is provided on the inner wall of the cavity of the second valve body. The valve seat is inserted from the upper part of the cavity of the second valve body, and then the retaining platform abuts against the retaining ring. The lower part of the valve seat passes through the central hole of the retaining ring, and a fixing screw is used to fix the valve seat within the second valve body above the retaining ring.

[0015] As a preferred embodiment of this utility model, a first sealing ring placement groove I is provided on the end face of the valve seat facing the first valve body, and a second sealing ring placement groove I is provided at the corresponding position of the first valve body; the first sealing ring placement groove I and the second sealing ring placement groove I constitute a sealing ring limiting groove; a first sealing ring placement groove II is provided on the end face of the second valve body facing the third valve body, and a second sealing ring placement groove II is provided at the corresponding position of the third valve body; the first sealing ring placement groove II and the second sealing ring placement groove II constitute another sealing ring limiting groove.

[0016] As a preferred embodiment of this utility model, the dynamic seal is an oil seal structure, which includes an oil seal seat and an oil seal. A sealing ring I and an oil seal are provided between the oil seal seat and the valve stem; a sealing ring is provided between the oil seal seat and the inner wall of the third valve cavity.

[0017] As a preferred embodiment of this utility model, the third valve body is provided with a valve stem through hole, the dynamic seal is installed at the valve stem through hole, and a bearing seat is fixed at the end of the dynamic seal away from the second valve body. The bearing seat protrudes from the third valve body, and the end of the valve stem passes through the dynamic seal and the bearing seat to protrude from the third valve body.

[0018] This invention uses an inlet to receive the original reflux valve's discharge and a valve stem to switch between the first and second outlets for reflux via reciprocating motion. This is used to accommodate different reflux pressures during coating with varying gap sizes. This invention allows for separate control of reflux with different gap sizes, enabling rapid adjustment of the electrode head surface density. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is an exploded view of the present invention.

[0022] Figure 3 This is a cross-sectional view of the present invention.

[0023] Figure 4 This is a schematic diagram of the structure of the first valve body of this utility model.

[0024] Figure 5 This is a schematic diagram of the structure of the second valve body of this utility model. Figure 1 .

[0025] Figure 6 This is a schematic diagram of the structure of the second valve body of this utility model. Figure 2 .

[0026] Figure 7 This is a schematic diagram of the structure of the third valve body of this utility model.

[0027] Figure 8 This is a schematic diagram of the valve seat of this utility model.

[0028] Figure 9 This is a schematic diagram of the dynamic seal of this utility model.

[0029] Figure 10 This is an assembly diagram of the valve stem, first valve cap, and second valve cap of this utility model. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Example 1:

[0032] A dual reflux valve structure, such as Figure 1-3As shown, the valve includes a valve body 1, a valve stem 2, a first valve cap 3, a second valve cap 4, and a dynamic seal 5. The valve body 1 has a first valve chamber 101, a second valve chamber 102, a third valve chamber 103, an inlet 104, a first outlet 105, and a second outlet 106. The first valve chamber 101, the second valve chamber 102, and the third valve chamber 103 are interconnected. The second valve chamber 102 is located between the first valve chamber 101 and the third valve chamber 103, and the inner diameter of the second valve chamber 102 is smaller than the inner diameters of the first valve chamber 101 and the third valve chamber 103. The inlet 104 communicates with the second valve chamber 102. The first outlet 105 communicates with the first valve chamber 101. The second outlet 106 communicates with the third valve chamber 103.

[0033] In this embodiment, as Figure 2 and 3 As shown, valve body 1 adopts a three-section assembly structure, including a first valve body 107, a second valve body 108, and a third valve body 109, which are fixed together by bolts; the first valve chamber 101 and the first outlet 105 are located in the first valve body 107; the inlet 104 and the second valve chamber 102 are located in the second valve body 108; and the second outlet 106 and the third valve chamber 103 are located in the third valve body 109. Figure 4-7 As shown, the first valve chamber is closed at the top and open at the bottom, with its side connected to the first outlet; the second valve chamber is a through hole, with an inlet on the side wall of the second valve body, which is connected to the second valve chamber and the outlet of the original reflux valve; the third valve chamber is also a through hole, with a second outlet on the side wall of the third valve body, which is connected to the third valve chamber.

[0034] To prevent leakage, sealing rings 7 are provided at the contact portions of the first valve body 107 and the second valve body 108, and at the contact portions of the second valve body 108 and the third valve body 109.

[0035] Because the inner diameter of the second valve chamber is the smallest compared to the first and third valve chambers, the cavity of the second valve body can be made into a channel with a small inner diameter, or the inner diameter of the channel can be changed by installing a valve seat, and the channel of the valve seat can be used as the second valve chamber. In this embodiment, the valve seat 8 is installed in the second valve body to achieve this.

[0036] like Figure 5 and 6 As shown, a valve seat 8 is installed in the cavity of the second valve body 108. The channel of the valve seat 8 serves as the second valve cavity 102, and the valve seat 8 is provided with a connection port 81 that communicates with the inlet 104.

[0037] To ensure a secure valve seat installation, a retaining ring 1081 is provided on the inner wall of the cavity of the second valve body 108. The retaining platform 82 of the valve seat 8 abuts against the retaining ring 1081, confining the valve seat 8 within the second valve body 108. (The valve seat is as follows...) Figure 8As shown, the valve seat is installed from the upper part of the second valve body cavity, and then the retaining plate abuts against the retaining ring. The lower part of the valve seat passes through the central hole of the retaining ring, and the valve seat is fixed in the second valve body by fixing screws above the retaining ring.

[0038] like Figure 4-6 As shown, the sealing ring between the first valve body and the second valve body is installed by providing a first sealing ring placement groove I83 on the end face of the valve seat 8 facing the first valve body 107, and a second sealing ring placement groove I1071 is provided at the corresponding position of the first valve body 107; the first sealing ring placement groove I83 and the second sealing ring placement groove I1071 form a sealing ring limiting groove, and the sealing ring is installed in the sealing ring limiting groove to prevent material leakage between the first valve body and the second valve body.

[0039] like Figure 5-7 As shown, for the installation of the sealing ring between the second valve body and the third valve body, the end face of the second valve body 108 facing the third valve body 109 is provided with a first sealing ring placement groove II1082, and the third valve body 109 is provided with a second sealing ring placement groove II1091 at the corresponding position; the first sealing ring placement groove II1082 and the second sealing ring placement groove II1091 constitute another sealing ring limiting groove, and the sealing ring is installed in the sealing ring limiting groove to prevent material leakage between the second valve body and the third valve body.

[0040] The third valve body 109 is provided with a valve stem through hole, and the dynamic seal 5 is installed at the valve stem through hole. In this embodiment, as shown... Figure 2 and 3 As shown in Figure 9, the dynamic seal 5 is an oil seal structure, which includes an oil seal seat 71 and an oil seal 72. A sealing ring I9 and an oil seal 72 are provided between the oil seal seat 71 and the valve stem 2. In specific installation, sealing grooves are provided at the upper and lower parts of the central hole of the oil seal seat 71. The sealing ring I9 is ​​located at the upper part of the central hole of the oil seal seat 71, and the oil seal 72 is located at the lower part of the central hole of the oil seal seat 71. A sealing ring 7 is provided between the oil seal seat 71 and the inner wall of the third valve chamber 103, and a sealing ring mounting groove is provided on the outer wall of the oil seal.

[0041] The end of the dynamic seal 5 away from the second valve body is fixed with a bearing housing 10 by bolts, and the bearing housing 10 is exposed in the third valve body.

[0042] One end of the valve stem 2 passes through the third valve chamber 103 and the second valve chamber 102 and is located in the first valve chamber 101. The other end of the valve stem 2 is exposed after the dynamic seal 5 and the bearing seat 10.

[0043] like Figure 2 and 3As shown in Figure 10, a first valve cap 3 is provided on the portion of the valve stem 2 located within the first valve chamber 101. The outer diameter of the first valve cap 3 is smaller than the inner diameter of the first valve chamber 101, and the outer diameter of the first valve cap 3 is larger than the inner diameter of the second valve chamber 102. Because the first valve body is a top-closed structure, the first valve cap 3 is detachably mounted on the valve stem 2 for ease of assembly. In this embodiment, the first valve cap 3 and the valve stem 2 are threaded together. To prevent the first valve cap from moving up and down, a valve cap fixing nut 6 is threadedly installed on the valve stem above the first valve cap 3. The detachable installation facilitates the installation of the valve stem and also allows adjustment of the valve stem's stroke by changing the position of the first valve cap on the valve stem.

[0044] The valve stem 2 located in the third valve chamber 103 is provided with a second valve cap 4. The outer diameter of the second valve cap 4 is smaller than the inner diameter of the third valve chamber 103 and the outer diameter of the second valve cap 4 is larger than the inner diameter of the second valve chamber 102. The second valve cap can be integrally formed on the valve stem or can be detachably set.

[0045] During assembly, first assemble the second valve body and the third valve body with bolts, then assemble the valve seat 8 and the valve stem 2, and then assemble the oil seal and bearing seat; then assemble the first valve cap, and finally install the first valve body and fix it together with the second valve body.

[0046] The valve stem 2 is subjected to force at the end exposed in the valve body, causing the valve body to reciprocate within the valve body 1. The reciprocating motion of the valve stem drives the first valve cap and the second valve cap to move. When the valve stem moves and the first valve cap blocks the connection between the first valve chamber and the second valve chamber, the second valve cap releases the connection between the second valve chamber and the third valve chamber. The material entering from the inlet enters the second valve chamber, then enters the third valve chamber, and is discharged from the second outlet, corresponding to a large gap backflow.

[0047] Conversely, when the valve stem moves to open the connection between the first valve chamber and the second valve chamber by the first valve cap, the second valve cap blocks the connection between the second valve chamber and the third valve chamber; the material entering from the inlet enters the second valve chamber, then enters the first valve chamber, and is discharged from the first outlet, corresponding to a small gap backflow.

[0048] Example 2:

[0049] A dual reflux valve structure is provided, wherein the valve body adopts an integral structure, an opening is provided at the top of the first valve chamber, and the opening is sealed with an end cap after the first valve cap is installed; the rest is the same as in Embodiment 1.

[0050] In this specification, the terms "an embodiment," "example," "specific example," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0051] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A dual reflux valve structure, comprising a valve body (1) and a valve stem (2), characterized in that: It also includes a first valve cap (3), a second valve cap (4), and a dynamic seal (5). The valve body (1) is provided with a first valve chamber (101), a second valve chamber (102), a third valve chamber (103), an inlet (104), a first outlet (105), and a second outlet (106). The first valve chamber (101), the second valve chamber (102), and the third valve chamber (103) are connected. The second valve chamber (102) is located between the first valve chamber (101) and the third valve chamber (103). The inner diameter of the second valve chamber (102) is smaller than the inner diameter of the first valve chamber (101) and the inner diameter of the third valve chamber (103). The inlet (104) is connected to the second valve chamber (102). The first outlet (105) is connected to the first valve chamber (101). The second outlet (106) is connected to the third valve chamber (103). One end of the valve stem (2) passes through the third valve chamber (103) and the second valve chamber (102) and is located in the first valve chamber (101). The other end of the valve stem (2) passes through the dynamic seal (5) at the third valve chamber (103) and is exposed in the valve body (1). The valve stem (2) reciprocates in the valve body (1). The portion of the valve stem (2) located in the first valve chamber (101) is provided with a first valve cap (3), the outer diameter of the first valve cap (3) is smaller than the inner diameter of the first valve chamber (101) and the outer diameter of the first valve cap (3) is larger than the inner diameter of the second valve chamber (102); the portion of the valve stem (2) located in the third valve chamber (103) is provided with a second valve cap (4), the outer diameter of the second valve cap (4) is smaller than the inner diameter of the third valve chamber (103) and the outer diameter of the second valve cap (4) is larger than the inner diameter of the second valve chamber (102).

2. The dual reflux valve structure according to claim 1, characterized in that: The first valve cap (3) is detachably mounted on the valve stem (2).

3. The dual reflux valve structure according to claim 2, characterized in that: The first valve cap (3) and valve stem (2) are threaded together.

4. The dual reflux valve structure according to any one of claims 1-3, characterized in that: The valve body (1) includes a first valve body (107), a second valve body (108) and a third valve body (109). The first valve chamber (101) and the first outlet (105) are located in the first valve body (107); the inlet (104) and the second valve chamber (102) are located in the second valve body (108); and the second outlet (106) and the third valve chamber (103) are located in the third valve body (109).

5. The dual reflux valve structure according to claim 4, characterized in that: A sealing ring (7) is provided at the contact portion of the first valve body (107) and the second valve body (108), and at the contact portion of the second valve body (108) and the third valve body (109).

6. The dual reflux valve structure according to claim 5, characterized in that: The cavity of the second valve body (108) is equipped with a valve seat (8), the channel of the valve seat (8) serves as the second valve cavity (102), and the valve seat (8) is provided with a connection port (81) that communicates with the inlet (104).

7. The dual reflux valve structure according to claim 6, characterized in that: The inner wall of the cavity of the second valve body (108) is provided with a retaining ring (1081), and the retaining plate (82) of the valve seat (8) abuts against the retaining ring (1081) to confine the valve seat (8) within the second valve body (108).

8. The dual reflux valve structure according to claim 7, characterized in that: A first sealing ring placement groove I (83) is provided on the end face of the valve seat (8) facing the first valve body (107), and a second sealing ring placement groove I (1071) is provided at the corresponding position of the first valve body (107); the first sealing ring placement groove I (83) and the second sealing ring placement groove I (1071) constitute a sealing ring limiting groove; a first sealing ring placement groove II (1082) is provided on the end face of the second valve body (108) facing the third valve body (109), and a second sealing ring placement groove II (1091) is provided at the corresponding position of the third valve body (109); the first sealing ring placement groove II (1082) and the second sealing ring placement groove II (1091) constitute another sealing ring limiting groove.

9. The dual reflux valve structure according to claim 1, characterized in that: The dynamic seal (5) is an oil seal structure, which includes an oil seal seat (71) and an oil seal (72). A sealing ring I (9) and an oil seal (72) are provided between the oil seal seat (71) and the valve stem (2); a sealing ring (7) is provided between the oil seal seat (71) and the inner wall of the third valve chamber (103).

10. The dual reflux valve structure according to claim 9, characterized in that: The third valve body (109) is provided with a valve stem through hole. The dynamic seal (5) is installed at the valve stem through hole, and the end of the dynamic seal (5) away from the second valve body is fixed with a bearing seat (10). The bearing seat (10) protrudes from the third valve body, and the end of the valve stem (2) passes through the dynamic seal (5) and the bearing seat (10) to protrude from the third valve body.

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