Hydraulic vacuum valve and mold

Abstract

The utility model discloses a hydraulic vacuum valve and a die, and relates to the technical field of vacuum valves, the hydraulic vacuum valve comprises a valve body and a valve core, the valve body is provided with an air exhaust cavity, one side of the valve body is connected with a vacuum pipe, and the vacuum pipe is communicated with the air exhaust cavity; the valve element is slidably connected to the valve body and provided with a communicating section and a sealing section, the outer wall of the sealing section and the inner wall of the air exhaust cavity are in abutting fit in the radial direction of the valve element, a radial sealing function is achieved, a communicating cavity is formed in the side, facing the vacuum pipe, of the communicating section, and when the sealing section extends out of the valve body, the communicating cavity, the air exhaust cavity and the vacuum pipe are communicated with the outside of the valve body. By arranging the radial seal, the valve element and the valve body do not need to be tensioned, sealing failure caused by looseness can be avoided, the sealing stability is improved, the machining difficulty can be lowered, and the maintenance cost can be lowered.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum valves, in particular to a hydraulic vacuum valve and a mold. Background Art

[0002] In the related art, a vacuum valve is often installed in the casting mold to evacuate the mold cavity. The vacuum valve is connected to the vacuum system to extract the air in the mold cavity, which can significantly reduce the formation of pores. The gas generated by the release agent and other volatile substances can be extracted by vacuum, which improves the surface finish of the die-casting and reduces defects. The valve core and the valve body of the current vacuum valve are matched through a conical surface. The conical surface needs to be ground and processed, which has high requirements for matching accuracy and is difficult to process. On the other hand, the valve core and the valve body need to be tightened to achieve sealing. If the valve core is axially loose, it will easily cause metal chips to enter the valve core and clog it, resulting in poor sealing stability and high maintenance costs. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a hydraulic vacuum valve and a mold, which can reduce the processing difficulty and improve the sealing stability.

[0004] A hydraulic vacuum valve according to an embodiment of the first aspect of the utility model comprises:

[0005] The valve body has an air pumping cavity, one side of the valve body is connected to a vacuum tube, and the vacuum tube is in communication with the air pumping cavity;

[0006] The valve core is slidably connected to the valve body. The valve core has a connecting section and a sealing section. Along the radial direction of the valve core, the outer wall of the sealing section abuts against the inner wall of the vacuum chamber. A connecting chamber is provided on the side of the connecting section facing the vacuum tube. When the sealing section extends out of the valve body, the connecting chamber, the vacuum chamber and the vacuum tube are connected to the outside of the valve body.

[0007] A hydraulic vacuum valve according to the first aspect of the embodiment of the utility model has at least the following beneficial effects: the embodiment is provided with a valve body and a valve core, the valve body has an exhaust cavity, one side of the valve body is connected to a vacuum tube, and the vacuum tube is connected to the exhaust cavity; the valve core is slidably connected to the valve body, the valve core has a connecting section and a sealing section, along the radial direction of the valve core, the outer wall of the sealing section abuts against the inner wall of the exhaust cavity to achieve a radial sealing function, a connecting cavity is provided on the side of the connecting section facing the vacuum tube, when the sealing section extends out of the valve body, the connecting cavity, the exhaust cavity and the vacuum tube are connected to the outside of the valve body to achieve a vacuum function, by setting a radial seal, there is no need to tighten the valve core and the valve body, can avoid sealing failure due to looseness, improve sealing stability, and can reduce processing difficulty and maintenance costs.

[0008] According to an embodiment of the first aspect of the utility model, a gas avoidance groove is provided at the end of the valve body, and the sealing section is located in the gas avoidance groove when the valve core extends out of the valve body.

[0009] According to an embodiment of the first aspect of the utility model, the air avoidance groove has a first wall surface, and the end of the valve core close to the air avoidance groove is provided with a second wall surface, and in a sealed state, the second wall surface overlaps with the first wall surface.

[0010] According to the embodiment of the first aspect of the utility model, communication cavities are provided on both sides of the communication section facing toward and away from the vacuum tube, and the two communication cavities are connected to each other.

[0011] According to an embodiment of the first aspect of the utility model, a passage connecting the two connecting cavities is provided between an end of the connecting section away from the sealing section and the bottom wall of the air pumping cavity.

[0012] According to an embodiment of the first aspect of the utility model, along the radial direction of the valve core, the communication cavity is arranged around the outer circumference of the communication section.

[0013] According to the embodiment of the first aspect of the utility model, the end of the connecting section away from the sealing section has a third wall surface, and the air suction cavity is provided with a fourth wall surface facing the third wall surface. In the sealed state, a channel is formed between the third wall surface and the fourth wall surface.

[0014] According to the embodiment of the first aspect of the utility model, a sealing sleeve is provided on the valve body, and the valve core has a rod portion inserted into the sealing sleeve.

[0015] According to the embodiment of the first aspect of the utility model, a sealing ring is provided on one end of the sealing sleeve close to the connecting section, a sealing platform is provided in the valve body, and the sealing ring abuts against the wall surface of the sealing platform facing away from the connecting section.

[0016] According to an embodiment of the second aspect of the utility model, a mold is provided, comprising the above-mentioned hydraulic vacuum valve.

[0017] The mold according to the second embodiment of the utility model has at least the following beneficial effects:

[0018] Compared with the prior art, the valve core of the present embodiment is slidably connected to the valve body, and the valve core has a connecting section and a sealing section. Along the radial direction of the valve core, the outer wall of the sealing section abuts against the inner wall of the air pumping cavity to realize the radial sealing function. When the sealing section extends out of the valve body, the connecting cavity, the air pumping cavity and the outside of the valve body are connected to realize the vacuum pumping function. By setting the radial seal, there is no need to tighten the valve core and the valve body, which can avoid sealing failure due to looseness, improve the sealing stability, reduce the processing difficulty and reduce the maintenance cost.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 An isometric view of a hydraulic vacuum valve in an embodiment of the first aspect of the utility model;

[0022] Figure 2 A first cross-sectional view of a hydraulic vacuum valve in an embodiment of the first aspect of the utility model;

[0023] Figure 3 for Figure 2 A magnified view of center A;

[0024] Figure 4 This is a second cross-sectional view of a hydraulic vacuum valve in an embodiment of the first aspect of the utility model.

[0025] Reference numerals:

[0026] Valve body 100; air avoidance groove 101; air extraction cavity 102; vacuum tube 103; first wall surface 104; sealing platform 105; fourth wall surface 106; sealing sleeve 107; sealing ring 108; nut 109;

[0027] Valve core 110 ; connecting section 111 ; sealing section 112 ; connecting chamber 113 ; second wall surface 114 ; channel 115 ; third wall surface 116 ; rod 117 ; hydraulic cylinder 118 ; connector 119 . DETAILED DESCRIPTION

[0028] The 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.

[0029] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, 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, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0032] Reference Figure 1 In the first aspect of the present invention, a hydraulic vacuum valve is provided, comprising a valve body 100 and a valve core 110. The valve body 100 has an air extraction cavity 102. A vacuum tube 103 is connected to one side of the valve body 100, and the vacuum tube 103 is connected to the air extraction cavity 102. The valve core 110 is slidably connected to the valve body 100. The valve core 110 has a connecting section 111 and a sealing section 112. Along the radial direction of the valve core 110, the outer wall of the sealing section 112 is abutted against the inner wall of the air extraction cavity 102 to achieve a radial sealing function. It can be understood that the outer wall of the valve core 110 and the inner wall of the air extraction cavity 102 are cylindrically matched, and the air tightness between the valve core 110 and the valve body 100 is achieved through radial sealing. There is no need to tighten the valve core 110 and the valve body 100, which can avoid sealing failure due to looseness, improve sealing stability, and reduce processing difficulty and maintenance costs.

[0033] Reference Figure 4 , a communication cavity 113 is provided on the side of the communication section 111 facing the vacuum tube 103. It can be understood that the communication cavity 113 is recessed in the radial side wall of the valve core 110. When the sealing section 112 extends out of the valve body 100, the communication cavity 113, the air pumping cavity 102 and the vacuum tube 103 are connected to the outside of the valve body 100 to achieve the vacuum pumping function. It can be understood that in the sealed state, the sealing section 112 is located in the air pumping cavity 102, and the radial outer wall of the sealing section 112 cooperates with the inner wall of the air pumping cavity 102 to achieve the sealing function.

[0034] It is understandable that both sides of the connecting section 111 facing and facing away from the vacuum tube 103 are provided with connecting cavities 113, and the two connecting cavities 113 are connected to each other, which helps to improve the efficiency of extracting air. Furthermore, a channel 115 connecting the two connecting cavities 113 is provided between the end of the connecting section 111 away from the sealing section 112 and the bottom wall of the air extraction cavity 102. Figure 2 and Figure 3Specifically, a sealing platform 105 is provided in the valve body 100, and the sealing platform 105 extends toward the valve core 110, thereby forming a fourth wall surface 106 on the air extraction chamber 102 facing the third wall surface 116. At the same time, the end of the connecting section 111 away from the sealing section 112 has a third wall surface 116. In a sealed state, a channel 115 is formed between the third wall surface 116 and the fourth wall surface 106. The channel 115 extends along the circumferential direction of the connecting section 111, which helps to ensure that the connecting chambers 113 located on both sides of the connecting section 111 are connected to each other, thereby improving the efficiency of extracting air when vacuuming. It is understandable that, in the sealed state, the sealing section 112 is located in the air extraction chamber 102, and the channel 115 has a preset thickness that enables the two connecting chambers 113 to communicate with each other. When the valve core 110 moves and the sealing section 112 extends outside the valve body 100, the thickness of the channel 115 will increase, which will further improve the air flow communication efficiency of the two connecting chambers 113, thereby ensuring a good vacuum function. On the other hand, the connecting chamber 113 can also be arranged around the outer periphery of the connecting section 111, which can also achieve the effect of improving the air extraction efficiency.

[0035] Furthermore, the end of the valve body 100 has an air-avoiding groove 101, and the sealing section 112 is located in the air-avoiding groove 101 when the valve core 110 extends out of the valve body 100. It can be understood that the air-avoiding groove 101 is recessed toward the valve body 100, which helps to prevent the valve core 110 from interfering with the mold or casting when it extends out of the valve body 100 in a vacuum state. Furthermore, the air-avoiding groove 101 has a first wall surface 104 on one side close to the valve core 110, and the end of the valve core 110 close to the air-avoiding groove 101 is provided with a second wall surface 114, and in a sealed state, the second wall surface 114 overlaps with the first wall surface 104. It is understandable that when the second wall surface 114 protrudes outside the first wall surface 104, the radial outer wall of the sealing section 112 has a portion that does not cooperate with the inner wall of the vacuum chamber 102, so the sealing area between the valve core 110 and the valve body 100 will be reduced, resulting in poor sealing effect, which is easy to cause the pressure in the mold cavity to deviate; when the second wall surface 114 is recessed in the first wall surface 104, a groove is formed between the second wall surface 114 and the air avoidance groove 101, and this groove is easy to accumulate metal chips or other impurities. In the vacuum state, the sealing section 112 extends out of the air avoidance groove 101, and metal chips or other impurities are easy to fall into the interior of the valve body 100 along the connecting cavity 113, thereby causing blockage. Therefore, in the sealed state, the second wall surface 114 overlaps with the first wall surface 104, which can achieve good sealing while avoiding the accumulation of debris and blockage.

[0036] Reference Figure 2It can be understood that the valve core 110 has a rod 117, and the rod 117 is located at one end of the valve core 110 away from the valve body 100. A hydraulic cylinder 118 is connected to the end of the rod 117 away from the valve body 100, and the valve core 110 is driven to move by the hydraulic cylinder 118. At the same time, a connector 119 connecting the hydraulic cylinder 118 and the rod 117 is provided between the hydraulic cylinder 118 and the rod 117. The connector 119 is buckled with the end of the rod 117, which helps to achieve a quick connection between the rod 117 and the hydraulic cylinder 118.

[0037] Reference Figure 4 The valve body 100 is provided with a sealing sleeve 107, the rod 117 is inserted into the sealing sleeve 107 and is slidably connected with the sealing sleeve 107, the radial outer wall of the rod 117 cooperates with the inner wall of the sealing sleeve 107, so as to achieve a sealing effect, and the valve core 110 can be limited by the sealing sleeve 107 to ensure that the valve core 110 moves in the axial direction, so as to ensure that the valve core 110 can stably cooperate with the air extraction cavity 102 before and after the switch, thereby improving the working stability. Further, a sealing ring 108 is provided between the end surface of the sealing sleeve 107 and the sealing platform 105, and the sealing ring 108 abuts against the wall surface of the sealing platform 105 that is away from the connecting section 111, so as to achieve radial sealing between the sealing sleeve 107 and the valve body 100, thereby improving the air tightness of the valve body 100. Further, at least two sealing sleeves 107 are provided along the axial direction of the rod 117, which is helpful to further improve the sealing effect and the movement stability of the valve core 110. At the same time, a sealing ring 108 is disposed between two adjacent sealing sleeves 107 , and the sealing ring 108 abuts against the ends of the two sealing sleeves 107 to achieve a good sealing effect.

[0038] In an embodiment of the second aspect of the utility model, a mold is provided, which includes the above-mentioned hydraulic vacuum valve. Since the mold adopts all technical solutions of the hydraulic vacuum valve of the above-mentioned embodiment, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiment.

[0039] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A hydraulic vacuum valve, characterized in that: include: A valve body having an air pumping cavity, one side of the valve body being connected to a vacuum tube, the vacuum tube being in communication with the air pumping cavity; The valve core is slidably connected to the valve body, and the valve core has a connecting section and a sealing section. Along the radial direction of the valve core, the outer wall of the sealing section abuts against the inner wall of the air pumping cavity. The connecting section is provided with a connecting cavity on the side facing the vacuum tube. When the valve core is extended out of the valve body, the sealing section is separated from the air pumping cavity, and the connecting cavity, the air pumping cavity and the vacuum tube are connected to the outside of the valve body.

2. A hydraulic vacuum valve according to claim 1, characterized in that: The end of the valve body is provided with a gas avoidance groove, and when the valve core extends out of the valve body, the sealing section is located in the gas avoidance groove.

3. A hydraulic vacuum valve according to claim 2, characterized in that: The air avoidance groove has a first wall surface, and the end of the valve core close to the air avoidance groove is provided with a second wall surface. In a sealed state, the second wall surface overlaps with the first wall surface.

4. A hydraulic vacuum valve according to claim 1, characterized in that: The communicating section is provided with the communicating cavities on both sides facing toward and away from the vacuum tube, and the two communicating cavities are communicated with each other.

5. A hydraulic vacuum valve according to claim 4, characterized in that: A passage for connecting the two connecting cavities is provided between an end of the connecting section away from the sealing section and the bottom wall of the air pumping cavity.

6. A hydraulic vacuum valve according to claim 1, characterized in that: Along the radial direction of the valve core, the communication cavity is arranged around the outer periphery of the communication section.

7. A hydraulic vacuum valve according to claim 5, characterized in that: The connecting section has a third wall at one end away from the sealing section, and the air pumping cavity is provided with a fourth wall facing the third wall. In a sealed state, the third wall and the fourth wall form the channel.

8. A hydraulic vacuum valve according to claim 1, characterized in that: The valve body is provided with a sealing sleeve, and the valve core has a rod portion inserted into the sealing sleeve.

9. A hydraulic vacuum valve according to claim 8, characterized in that: A sealing ring is provided on one end of the sealing sleeve close to the connecting section, a sealing platform is provided in the valve body, and the sealing ring abuts against the wall surface of the sealing platform facing away from the connecting section.

10. A mold, characterized in that A hydraulic vacuum valve comprising any one of claims 1 to 9.

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