An anti-crystallization straight-through membrane plug valve for battery electrolyte filling

Abstract

The present invention relates to an anti-crystallization straight-through membrane plug valve for battery electrolyte filling, wherein the lower valve body and the upper valve body are fixed, the lower valve body is formed with an inlet, an outlet and a connecting portion, the inlet and the outlet are connected through the connecting portion, the diaphragm includes a tapered portion and a connecting portion, the connecting portion is located outside the tapered portion and is integrally formed with the tapered portion, the edge of the connecting portion is fixed relative to the lower valve body, the tapered portion is formed with a first tapered surface, the connecting portion is formed with a second tapered surface, and the first tapered surface and the second tapered surface are adapted. The connecting portion of the present invention does not have a valve seat, nor is it narrowed, but is sealed by the second tapered surface and the tapered portion, the straight flow path improves the flow coefficient and reduces the accumulated liquid, thereby reducing the number of crystals left after the accumulated liquid dries, improving the sealing and life of the diaphragm and the valve body, and solving the problem of low flow coefficient and high crystallization of the existing membrane plug valve.

Description

Technical Field

[0001] The invention relates to the field of membrane plug valves, in particular to an anti-crystallization straight-through membrane plug valve for battery electrolyte filling. Background Art

[0002] Existing diaphragm plug valves are all provided with valve seats, and the diaphragm and the valve seat are in contact to separate the two ends of the diaphragm plug valve. Since the valve body has a valve seat or a narrow neck structure, when the diaphragm is opened, the flow path of the liquid is not a straight line, which causes the flow coefficient of the existing diaphragm plug valve to be low. At the same time, since the flow path is not a straight line, the volume of accumulated liquid will be large at the bends of the flow path. After drying, the battery electrolyte will leave crystals on the diaphragm and valve body of the diaphragm plug valve, resulting in a decrease in the life and sealing of the diaphragm plug valve.

[0003] The valve stem and diaphragm of the existing diaphragm plug valve are fixed, so that the valve stem and diaphragm can only move up and down relative to the valve body, resulting in the phenomenon that the sealing surfaces of the diaphragm and the valve body do not fit together when they are in contact. Especially after the sealing surface of the diaphragm is worn, the diaphragm and the valve seat are even less fitted, affecting the sealing performance of the diaphragm plug valve. Summary of the invention

[0004] The present invention aims to solve the above-mentioned problems and provides an anti-crystallization straight-through membrane plug valve for battery electrolyte filling, which solves the problems of low flow coefficient and high crystallization of existing membrane plug valves, and solves the problem of insufficient sealing caused by the non-fitting of the sealing surface of the diaphragm and the sealing surface of the valve seat.

[0005] An anti-crystallization straight-through diaphragm plug valve for battery electrolyte filling, comprising: a lower valve body, an upper valve body and a diaphragm, the lower valve body and the upper valve body are fixedly connected, the lower valve body is formed with an inlet, an outlet and a connecting portion, the inlet and the outlet are connected through the connecting portion, the diaphragm comprises a tapered portion and a connecting portion, the connecting portion is located outside the tapered portion and is integrally formed with the tapered portion, the edge of the connecting portion is fixed relative to the lower valve body, the tapered portion is formed with a first tapered surface, the connecting portion is formed with a second tapered surface, the first tapered surface and the second tapered surface are adapted to each other.

[0006] On the basis of the above technical solution, it also includes a valve stem and a screw rod, wherein the screw rod penetrates into the conical portion and is fixed relative to the conical portion, the valve stem moves up and down relative to the upper valve body, and the valve stem drives the screw rod to move.

[0007] On the basis of the above technical solution, it also includes a movable block and a pin shaft, the valve stem is formed with a mounting groove, the movable block is inserted into the mounting groove and there is a gap between the movable block and the inner wall of the mounting groove, the pin shaft is located in the mounting groove, both ends of the pin shaft are respectively fixedly connected to the valve stem, the pin shaft passes through the movable block and there is a gap between the movable block, and the screw rod is inserted into the movable block and is threadedly connected to the movable block.

[0008] Based on the above technical solution, the diaphragm further includes a sealing protrusion, which is located below the conical portion and is integrally formed with the conical portion, and the connecting portion is formed with a sealing groove for accommodating the sealing protrusion.

[0009] Based on the above technical solution, the thickness of the sealing protrusion is consistent at all places, the sealing groove includes a middle sealing groove and a side sealing groove, the two ends of the middle sealing groove are respectively connected to the side sealing groove, the depth of the middle sealing groove is consistent at all places, and the depth of the side sealing groove gradually decreases along the direction away from the middle sealing groove.

[0010] Based on the above technical solution, the conical portion and the connecting portion are both rotating bodies, the edge of the connecting portion is clamped and fixed by the lower valve body and the upper valve body, and the diaphragm is made of elastic material.

[0011] On the basis of the above technical solution, it also includes a piston, a piston guide ring and an O-ring. The piston is located inside the upper valve body and is slidably connected to the upper valve body. The valve stem is fixedly connected to the piston. The piston guide ring and the O-ring are respectively mounted on the outside of the piston. The piston guide ring and the O-ring are respectively in contact with the inner wall of the upper valve body. The piston guide ring is made of polytetrafluoroethylene.

[0012] On the basis of the above technical solution, it also includes a spring, the piston divides the inner part of the upper valve body into two isolated chambers, the two isolated chambers of the upper valve body are respectively formed with vents, the top of the upper valve body is fixedly connected to the valve cover, the two ends of the spring are respectively in contact with the valve cover and the piston, and the spring is used to drive the piston to move toward the lower valve body.

[0013] On the basis of the above technical solution, a third chamber is formed between the upper valve body and the diaphragm, a first through hole is formed on the upper valve body, and the third chamber is communicated with the first through hole.

[0014] On the basis of the above technical solution, it also includes a first sealing ring and a sealing retaining ring, the upper valve body is formed with a valve stem hole, the valve stem passes through the valve stem hole, the inner wall of the valve stem hole is formed with an annular groove, the first sealing ring and the sealing retaining ring are located in the annular groove, the first sealing ring is located between the groove bottom of the annular groove and the sealing retaining ring, the inner and outer sides of the sealing retaining ring are respectively in contact with the valve stem and the first sealing ring, and the valve stem is slidably connected with the sealing retaining ring;

[0015] The sealing retaining ring is made of polytetrafluoroethylene, an arc-shaped groove is formed on the outer side of the sealing retaining ring, and the first sealing ring part is located in the arc-shaped groove.

[0016] The present invention has the following advantages: the connecting portion is not provided with a valve seat, nor is it narrowed, but is sealed by the second conical surface and the conical portion. The straight flow path improves the flow coefficient and reduces the accumulated liquid, thereby reducing the number of crystals left after the accumulated liquid dries, improving the sealing and service life of the diaphragm and the valve body, and solving the problems of low flow coefficient and high crystallization in the existing diaphragm plug valve; the conical portion of the diaphragm moves with the movable block, and the movable block makes axial, rotational and radial movements relative to the valve stem, so that the first conical surface fits the second conical surface, thereby improving the sealing of the sealing point, and solving the problem of insufficient sealing caused by the non-fitting of the sealing surface of the diaphragm and the sealing surface of the valve seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only one embodiment of the present invention, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0018] Figure 1 : A schematic diagram of the main cross-sectional structure of the present invention when it is closed;

[0019] Figure 2 : A schematic diagram of the main cross-sectional structure of the present invention when it is opened;

[0020] Figure 3 : Schematic diagram of the cross-sectional structure at AA;

[0021] Figure 4 : Schematic diagram of the local enlarged structure at B;

[0022] Figure 5 : Schematic diagram of the local enlarged structure at C;

[0023] Figure 6 : Schematic diagram of the top view of part of the lower valve body;

[0024] Figure 7 : Schematic diagram of the three-dimensional structure of part of the lower valve body;

[0025] Figure 8 : Schematic diagram of the three-dimensional structure of the tapered portion and the sealing protrusion. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and examples:

[0027] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] Embodiment 1:

[0031] like Figures 1 to 8 As shown, this embodiment provides an anti-crystallization straight-through diaphragm plug valve for battery electrolyte filling, including: a lower valve body 1, an upper valve body 2 and a diaphragm 3, the lower valve body 1 and the upper valve body 2 are fixedly connected, the lower valve body 1 is formed with an inlet 11, an outlet 12 and a connecting portion 13, the inlet 11 and the outlet 12 are connected through the connecting portion 13, the diaphragm 3 includes a tapered portion 31 and a connecting portion 32, the connecting portion 32 is located on the outside of the tapered portion 31 and is integrally formed with the tapered portion 31, the edge of the connecting portion 32 is fixed relative to the lower valve body 1, the tapered portion 31 is formed with a first tapered surface 311, the connecting portion 13 is formed with a second tapered surface 131, the first tapered surface 311 and the second tapered surface 131 are adapted to each other.

[0032] On the basis of the above technical solution, it also includes a conical core 44, the conical core 44 is located inside the conical portion 31, the outer side surface of the conical core 44 is in contact with the inner wall of the conical portion 31, and the conical core 44 is made of a rigid material;

[0033] The valve stem 4 and the screw 43 are also included. The screw 43 penetrates into the conical portion 31 and is fixedly connected to the conical core 44. The valve stem 4 moves up and down relative to the upper valve body 2, and the valve stem 4 drives the screw 43 to move.

[0034] On the basis of the above technical solution, it also includes a movable block 41 and a pin shaft 42, the valve stem 4 is formed with a mounting groove 40, the movable block 41 is inserted into the mounting groove 40 and there is a gap with the inner wall of the mounting groove 40, the pin shaft 42 is located in the mounting groove 40, both ends of the pin shaft 42 are respectively fixedly connected to the valve stem 4, the pin shaft 42 passes through the movable block 41 and there is a gap between the movable block 41, and the screw rod 43 is inserted into the movable block 41 and is threadedly connected to the movable block 41.

[0035] Based on the above technical solution, the diaphragm 3 further includes a sealing protrusion 33 , which is located below the conical portion 31 and is formed integrally with the conical portion 31 , and the connecting portion 13 is formed with a sealing groove 132 for accommodating the sealing protrusion 33 .

[0036] On the basis of the above technical solution, the thickness of the sealing protrusion 33 is consistent at all locations, the sealing groove 132 includes a middle sealing groove 1321 and a side sealing groove 1322, the two ends of the middle sealing groove 1321 are respectively connected to the side sealing groove 1322, the depth of the middle sealing groove 1321 is consistent at all locations, and the depth of the side sealing groove 1322 gradually decreases along the direction away from the middle sealing groove 1321.

[0037] Based on the above technical solution, the conical portion 31 and the connecting portion 32 are both rotating bodies, the edge of the connecting portion 32 is clamped and fixed by the lower valve body 1 and the upper valve body 2, and the diaphragm 3 is made of elastic material. Preferably, the diaphragm 3 is made of polytetrafluoroethylene.

[0038] On the basis of the above technical solution, it also includes a piston 5, a piston guide ring 51 and an O-ring 52. The piston 5 is located inside the upper valve body 2 and is slidably connected to the upper valve body 2. The valve stem 4 is fixedly connected to the piston 5. The piston guide ring 51 and the O-ring 52 are respectively mounted on the outside of the piston 5. The piston guide ring 51 and the O-ring 52 are respectively in contact with the inner wall of the upper valve body 2. The piston guide ring 51 is made of polytetrafluoroethylene.

[0039] On the basis of the above technical solution, it also includes a spring 53, and the piston 5 divides the interior of the upper valve body 2 into two isolated chambers. The two isolated chambers of the upper valve body 2 are respectively formed with vents. The top of the upper valve body 2 is fixedly connected to the valve cover 21, and the two ends of the spring 53 are respectively in contact with the valve cover 21 and the piston 5. The spring 53 is used to drive the piston 5 to move toward the lower valve body 1.

[0040] On the basis of the above technical solution, a third chamber 30 is formed between the upper valve body 2 and the diaphragm 3 , a first through hole 22 is formed on the upper valve body 2 , and the third chamber 30 is communicated with the first through hole 22 .

[0041] On the basis of the above technical solution, it also includes a first sealing ring 23 and a sealing retaining ring 24, the upper valve body 2 is formed with a valve stem hole 20, the valve stem 4 passes through the valve stem hole 20, the inner wall of the valve stem hole 20 is formed with an annular groove 25, the first sealing ring 23 and the sealing retaining ring 24 are located in the annular groove 25, the first sealing ring 23 is located between the groove bottom of the annular groove 25 and the sealing retaining ring 24, the inner and outer sides of the sealing retaining ring 24 are in contact with the valve stem 4 and the first sealing ring 23 respectively, and the valve stem 4 is slidably connected with the sealing retaining ring 24;

[0042] The sealing retaining ring 24 is made of polytetrafluoroethylene, and an arc-shaped groove is formed on the outer side of the sealing retaining ring 24, and a part of the first sealing ring 23 is located in the arc-shaped groove.

[0043] The elasticity of the first sealing ring 23 (the cross-section line is not shown in the figure) is greater than the elasticity of the sealing retaining ring 24 (made of rubber and silicone), and the first sealing ring 23 applies an inward force to the sealing retaining ring 24, so that the sealing retaining ring 24 is tightly attached to the valve stem 4.

[0044] The inner side surface of the sealing retaining ring 24 contacts the valve stem 4 to perform a sealing function. At the same time, the two sealing retaining rings 24 limit the valve stem 4 so that the valve stem 4 moves roughly in the up and down directions to complete the opening and closing of the valve.

[0045] Working principle:

[0046] When the valve is opened, high-pressure gas enters the vent hole of the chamber below the piston 5, and the piston 5 is forced upward by the high-pressure gas. The piston 5 slides upward, driving the valve stem 4 and the center portion 31 to move upward, and the first cone surface 311 and the second cone surface 131 are out of contact. The liquid entering the inlet 11 passes through the connecting portion 13 and is discharged from the outlet 12. The liquid flows in the direction of Figure 2 As indicated by the arrow.

[0047] When the valve is closed, the high-pressure gas in the chamber below the piston 5 is discharged from the vent hole, and the piston 5 is forced downward by the spring 53. The piston 5 moves downward, driving the valve stem 4 and the tapered portion 31 to move downward. The connecting portion 32 is elastically deformed, and the length of the connecting portion 32 increases and the thickness decreases. At the same time, the connecting portion 32 pulls the tapered portion 31, so that the tapered portion 31 (such as the tapered portion 31) whose wall thickness gradually increases from bottom to top Figure 2 The wall thickness gradually becomes uniform (as shown in Figure 1 As shown in FIG. 1 , the taper of the first conical surface 311 is changed. In this process, the inner wall of the conical portion 31 always keeps in contact with the conical surface of the conical core 4. Similarly, the bottom thickness of the V-shaped sealing protrusion 33 remains unchanged, while the thickness on both sides decreases.

[0048] When the valve stem 4 stops moving, the first conical surface 311 fits with the second conical surface 131 and applies pressure to the second conical surface 131. At this time, the sealing protrusion 33 is inserted into the sealing groove 132 and fits with the sealing protrusion 33. The side sealing groove 1322 and the two sides of the sealing protrusion 33 are completely fitted. The sealing protrusion 33 is inserted into the sealing groove 132 to enhance the sealing performance.

[0049] The movable block 41 is formed with a second through hole 410, through which the pin 42 passes, and the inner diameter of the second through hole 410 is greater than the outer diameter of the pin 42. The movable block 41 can move axially, rotate, and radially relative to the pin 42. The first conical surface 311 and the second conical surface 131 guide the conical portion 31 moving downward. During this process, the movable block 41 moves relative to the valve stem 4 that can only move up and down, so that the first conical surface 311 fits with the second conical surface 131, and the sealing protrusion 33 fits with the sealing groove 132.

[0050] The volume of the third chamber 30 will change during the movement of the diaphragm 3, and the first through hole 22 can play the role of air intake and exhaust. At the same time, the first through hole 22 can also play the role of discharging the liquid under the diaphragm 3 after the diaphragm 3 is broken. The liquid flows out of the first through hole 22, which can remind the user to replace the diaphragm 3.

[0051] The piston guide ring 51 with a rectangular cross section cooperates with the O-ring 52 to achieve a better sealing effect. The piston guide ring 51 is slidably connected to the inner wall of the upper valve body 2 to prevent the piston 5 from directly rubbing against the interior of the upper valve body 2 (cylinder), thereby extending the service life of the piston 5 and the upper valve body 2.

[0052] The flow path of the liquid in the inlet 11, the outlet 12 and the connecting portion 13 is straight, which improves the flow coefficient compared with the diaphragm valve narrowed at the neck. Since there is no narrowing at the neck and no valve seat, the lower valve body 1 has less liquid accumulation when closed, thereby reducing the number of crystals left after the accumulated liquid dries.

[0053] The present invention is described above by way of examples, but the present invention is not limited to the above specific embodiments, and any changes or modifications made based on the present invention belong to the scope of protection claimed by the present invention.

Claims

1. An anti-crystallization straight-through membrane plug valve for battery electrolyte filling, characterized in that: include: A lower valve body (1), an upper valve body (2) and a diaphragm (3), wherein the lower valve body (1) and the upper valve body (2) are fixedly connected, the lower valve body (1) is formed with an inlet (11), an outlet (12) and a connecting portion (13), the inlet (11) and the outlet (12) are connected via the connecting portion (13), the diaphragm (3) comprises a conical portion (31) and a connecting portion (32), the connecting portion (32) is located outside the conical portion (31) and is integrally formed with the conical portion (31), the edge of the connecting portion (32) is fixed relative to the lower valve body (1), the conical portion (31) is formed with a first conical surface (311), the connecting portion (13) is formed with a second conical surface (131), and the first conical surface (311) and the second conical surface (131) are adapted to each other; It also includes a valve stem (4) and a screw (43), It also includes a movable block (41) and a pin shaft (42), the valve stem (4) is formed with a mounting groove (40), the movable block (41) is inserted into the mounting groove (40) and has a gap with the inner wall of the mounting groove (40), the pin shaft (42) is located in the mounting groove (40), both ends of the pin shaft (42) are respectively fixedly connected to the valve stem (4), the pin shaft (42) passes through the movable block (41) and has a gap with the movable block (41), and the screw rod (43) is inserted into the movable block (41) and is threadedly connected to the movable block (41).

2. The anti-crystallization straight-through membrane plug valve for battery electrolyte filling according to claim 1 is characterized in that: The screw rod (43) penetrates into the conical portion (31) and is fixed relative to the conical portion (31); the valve stem (4) moves up and down relative to the upper valve body (2); and the valve stem (4) drives the screw rod (43) to move.

3. The anti-crystallization straight-through membrane plug valve for battery electrolyte filling according to claim 1 is characterized in that: The diaphragm (3) further comprises a sealing protrusion (33), wherein the sealing protrusion (33) is located below the conical portion (31) and is integrally formed with the conical portion (31), and the connecting portion (13) is formed with a sealing groove (132) for accommodating the sealing protrusion (33).

4. The anti-crystallization straight-through membrane plug valve for battery electrolyte filling according to claim 3 is characterized in that: The thickness of the sealing protrusion (33) is uniform at all locations, the sealing groove (132) comprises a middle sealing groove (1321) and a side sealing groove (1322), both ends of the middle sealing groove (1321) are respectively connected to the side sealing groove (1322), the depth of the middle sealing groove (1321) is uniform at all locations, and the depth of the side sealing groove (1322) gradually decreases in a direction away from the middle sealing groove (1321).

5. The anti-crystallization straight-through membrane plug valve for battery electrolyte filling according to claim 1, characterized in that: The conical portion (31) and the connecting portion (32) are both rotating bodies; the edge of the connecting portion (32) is clamped and fixed by the lower valve body (1) and the upper valve body (2); and the diaphragm (3) is made of elastic material.

6. The anti-crystallization straight-through membrane plug valve for battery electrolyte filling according to claim 2, characterized in that: It also comprises a piston (5), a piston guide ring (51) and an O-ring (52); the piston (5) is located inside the upper valve body (2) and is slidably connected to the upper valve body (2); the valve stem (4) is fixedly connected to the piston (5); the piston guide ring (51) and the O-ring (52) are respectively sleeved on the outside of the piston (5); the piston guide ring (51) and the O-ring (52) are respectively in contact with the inner wall of the upper valve body (2); the piston guide ring (51) is made of polytetrafluoroethylene.

7. The anti-crystallization straight-through membrane plug valve for battery electrolyte filling according to claim 6, characterized in that: It also includes a spring (53), the piston (5) divides the interior of the upper valve body (2) into two isolated chambers, the two isolated chambers of the upper valve body (2) are respectively formed with vent holes, the top of the upper valve body (2) is fixedly connected to the valve cover (21), the two ends of the spring (53) are respectively in contact with the valve cover (21) and the piston (5), and the spring (53) is used to drive the piston (5) to move in a direction close to the lower valve body (1).

8. The anti-crystallization straight-through membrane plug valve for battery electrolyte filling according to claim 1, characterized in that: A third chamber (30) is formed between the upper valve body (2) and the diaphragm (3), a first through hole (22) is formed on the upper valve body (2), and the third chamber (30) is in communication with the first through hole (22).

9. The anti-crystallization straight-through membrane plug valve for battery electrolyte filling according to claim 2, characterized in that: The valve body (2) further comprises a first sealing ring (23) and a sealing retaining ring (24); the upper valve body (2) is formed with a valve stem hole (20); the valve stem (4) passes through the valve stem hole (20); an annular groove (25) is formed on the inner wall of the valve stem hole (20); the first sealing ring (23) and the sealing retaining ring (24) are located in the annular groove (25); the first sealing ring (23) is located between the groove bottom of the annular groove (25) and the sealing retaining ring (24); the inner and outer sides of the sealing retaining ring (24) are in contact with the valve stem (4) and the first sealing ring (23) respectively; the valve stem (4) is slidably connected to the sealing retaining ring (24); the sealing retaining ring (24) is made of polytetrafluoroethylene; an arc groove is formed on the outer side of the sealing retaining ring (24); a portion of the first sealing ring (23) is located in the arc groove.

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