CN212899920U - Check valve and static vacuum pouring equipment - Google Patents

Abstract

The utility model provides a check valve and static vacuum casting equipment. The one-way valve comprises a valve body, a valve core and a pre-tightening elastic structure; the valve body is provided with a valve cavity, a feed inlet and a discharge outlet which are communicated with the valve cavity; the valve core is arranged in the valve cavity; the pre-tightening elastic structure is arranged in the valve cavity, one end of the pre-tightening elastic structure is connected to the valve body, and the other end of the pre-tightening elastic structure is connected to the valve core so as to apply pre-tightening force towards the feed port to the valve core and enable the feed port to be closed under the normal state of the valve core. Through the structure design, the utility model provides a check valve realizes the normal close formula design of valve, adopts the pretension to seal and has replaced current pneumatic seal, adopts passive pressure to open and close and has replaced current active control and open and close to can satisfy the material transport requirement of measuring pump periodic type, in addition, the utility model discloses effective reduce cost retrencies control, has improved the reliability of valve.

Description

Check valve and static vacuum pouring equipment

Technical Field

The utility model relates to a static vacuum casting equipment technical field especially relates to a check valve and static vacuum casting equipment.

Background

The outlet of the metering pump of the static vacuum casting equipment produced at present at home generally adopts a pneumatic valve to control materials, silicon powder (powdery particles) is added into resin during casting, and the valve is opened/closed at the frequency of 4 times per minute and the sealed part of the valve core is quickly abraded and damaged, so that the service life of the valve is greatly shortened, and the failure occurrence rate of the equipment is increased.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to overcome at least one of the drawbacks of the prior art and to provide a check valve with a long service life and a low failure rate.

Another main object of the present invention is to overcome at least one of the drawbacks of the prior art and to provide a static vacuum casting apparatus having the check valve.

For realizing the purpose, the utility model adopts the following technical scheme:

according to one aspect of the present invention, there is provided a check valve; the check valve comprises a valve body, a valve core and a pre-tightening elastic structure; the valve body is provided with a valve cavity, a feeding hole and a discharging hole which are communicated with the valve cavity; the valve core is arranged in the valve cavity; the pre-tightening elastic structure is arranged in the valve cavity, one end of the pre-tightening elastic structure is connected to the valve body in a relative mode, the other end of the pre-tightening elastic structure is connected to the valve core, so that pre-tightening force towards the feeding hole is applied to the valve core, and the feeding hole is closed by the valve core under a normal state.

According to one embodiment of the present invention, the feed inlet is in a frustum shape, and the size of the end of the feed inlet adjacent to the valve cavity is larger than the size of the end of the feed inlet away from the valve cavity; the valve core is provided with a closed end corresponding to the feeding hole, and the closed end is in a frustum shape; when the valve core is sealed at the feed port, the outer conical surface of the valve core is abutted against the inner conical surface of the feed port to realize sealing.

According to one embodiment of the present invention, the inner conical surface of the feed inlet and/or the outer conical surface of the valve element is provided with a sealing member.

According to one of the embodiments of the present invention, the check valve further comprises an adjusting nut; the adjusting nut is arranged in the valve cavity, and one end of the pre-tightening elastic structure is connected to the adjusting nut and is relatively connected to the valve body through the adjusting nut; the cavity wall of the valve cavity is provided with threads so that the adjusting nut is in threaded fit with the valve cavity and can be adjusted relative to the feeding hole, and then the pretightening force applied to the valve core by the pretightening elastic structure is adjusted.

According to one embodiment of the present invention, the valve body comprises a body, a first end cap and a second end cap; the body is of a cylindrical structure, and a cylindrical cavity of the body defines the valve cavity; the first end cover is detachably sealed outside a cylindrical opening of the body; the second end cover is detachably sealed outside the other end cylinder opening of the body; wherein, the feed inlet contains to be seted up in the first feed inlet of first end cover, the discharge gate contains to be seted up in the first discharge gate of second end cover.

According to one embodiment of the present invention, the valve body further comprises a first gland; the first gland is detachably sealed in an end socket of the body and is adjacent to the inner side of the first end cap; wherein, the feed inlet contains to set up in the second feed inlet of first gland, the second feed inlet communicate in first feed inlet.

According to the utility model discloses a one of them embodiment, first feed inlet is the column, the second feed inlet is the frustum form.

According to one embodiment of the present invention, the valve body further comprises a second gland; the second gland is detachably sealed in the barrel opening at the other end of the body and is adjacent to the inner side of the second end cover; the discharge port comprises a second discharge port arranged on the second gland, and the second discharge port is communicated with the first discharge port.

According to the utility model discloses a one of them embodiment, first discharge gate is the column, the second discharge gate is the frustum form.

According to another aspect of the present invention, there is provided a static vacuum casting apparatus; wherein the static vacuum casting device comprises a metering pump, a casting line and the one-way valve according to the invention and described in the embodiments; the feeding hole of the one-way valve is communicated with the metering pump, and the discharging hole of the one-way valve is communicated with the pouring pipeline.

By technical scheme can know, the utility model provides an advantage and the positive effect of check valve and static vacuum casting equipment lie in:

the utility model provides a check valve through set up pretension elastic construction in the valve pocket, connects pretension elastic construction one end in the valve body relatively, and the other end is connected in the case of valve intracavity. Therefore, the pretightening force towards the feed port can be applied to the valve core through the pretightening elastic structure, so that the feed port is closed by the valve core under a normal state. Through the structure design, the utility model provides a check valve realizes the normal close formula design of valve, adopts the pretension to seal and has replaced current pneumatic seal, adopts passive pressure to open and close and has replaced current active control and open and close to can satisfy the material transport requirement of measuring pump periodic type, in addition, the utility model discloses effective reduce cost retrencies control, has improved the reliability of valve.

Drawings

The various objects, features and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments of the invention, when considered in conjunction with the accompanying drawings. The drawings are merely exemplary of the invention and are not necessarily drawn to scale. In the drawings, like reference characters designate the same or similar parts throughout the different views. Wherein:

FIG. 1 is a perspective view of a one-way valve shown in accordance with an exemplary embodiment;

FIG. 2 is a front view of the check valve shown in FIG. 1;

FIG. 3 is a top view of the check valve shown in FIG. 1;

fig. 4 is an axial cross-sectional view of the check valve shown in fig. 1.

The reference numerals are explained below:

100. a valve body;

101. a body;

102. a first end cap;

1021. a first feed port;

103. a second end cap;

1031. a first discharge port;

104. a first gland;

1041. a second feed port;

105. a second gland;

1051. a second discharge port;

106. a screw;

110. a valve cavity;

120. a feed inlet;

130. a discharge port;

140. fastening a screw rod;

150. installing a bolt;

200. a valve core;

300. pre-tightening the elastic structure;

400. a seal member;

500. adjusting the nut;

510. a through hole;

520. a hexagonal socket structure;

530. a clamping groove.

Detailed Description

Exemplary embodiments that embody features and advantages of the invention are described in detail below. It is to be understood that the invention is capable of other and different embodiments and its several details are capable of modification without departing from the scope of the invention, and that the description and drawings are to be regarded as illustrative in nature and not as restrictive.

In the following description of various exemplary embodiments of the invention, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration various exemplary structures, systems, and steps in which aspects of the invention may be practiced. It is to be understood that other specific arrangements of parts, structures, example devices, systems, and steps may be utilized, and structural and functional modifications may be made without departing from the scope of the present invention. Moreover, although the terms "over," "between," "within," and the like may be used in this specification to describe various example features and elements of the invention, these terms are used herein for convenience only, e.g., in accordance with the orientation of the examples described in the figures. Nothing in this specification should be construed as requiring a specific three dimensional orientation of structures to fall within the scope of the invention.

Referring to fig. 1, a perspective view of a check valve in accordance with the present invention is representatively illustrated. In this exemplary embodiment, the check valve proposed by the present invention is described by way of example as applied to a static vacuum casting apparatus. Those skilled in the art will readily appreciate that various modifications, additions, substitutions, deletions, or other changes may be made to the embodiments described below in order to utilize the inventive concepts of the present invention in other types of valves or other devices, and still fall within the scope of the principles of the check valves set forth herein.

As shown in fig. 1, in the present embodiment, the check valve according to the present invention includes a valve body 100, a valve body 200, and a biasing elastic structure 300. Referring to fig. 2-4 in combination, fig. 2 representatively illustrates a front view of a one-way valve which can embody principles of the present disclosure; representatively illustrated in fig. 3 is a top view of a one-way valve which can embody principles of the present invention; representatively illustrated in fig. 4 is an axial cross-sectional view of a one-way valve which can embody principles of the present invention. The structure, connection mode and functional relationship of the main components of the check valve proposed by the present invention will be described in detail below with reference to the above drawings.

As shown in fig. 1 to 4, in the present embodiment, the valve body 100 has a valve chamber 110, and a feed port 120 and a discharge port 130 communicating with the valve chamber 110. The valve core 200 is disposed in the valve chamber 110. The pre-tightening elastic structure 300 is disposed in the valve cavity 110, one end of the pre-tightening elastic structure 300 is connected to the valve body 100, and the other end is connected to the valve core 200. The pre-tightening elastic structure 300 can apply a pre-tightening force to the valve element 200 toward the feed port 120, so that the valve element 200 closes the feed port 120 in a normal state. The term "under normal conditions" refers to that the material (e.g., the casting slurry) is not input from the input port 120, or refers to the impact force of the material input from the input port 120 to the valve element 200, and the pre-tightening force applied to the valve element 200 by the pre-tightening elastic structure 300 is not overcome, i.e., the impact force is less than or equal to the pre-tightening force. Through the structure design, the utility model provides a check valve realizes the normal close formula design of valve, adopts the pretension to seal and has replaced current pneumatic seal, adopts passive pressure to open and close and has replaced current active control and open and close to can satisfy the material transport requirement of measuring pump periodic type, in addition, the utility model discloses effective reduce cost retrencies control, has improved the reliability of valve.

Alternatively, as shown in fig. 4, in the present embodiment, the feed inlet 120 may preferably be substantially frustum-shaped, i.e., the size of the end of the feed inlet 120 adjacent to the valve chamber 110 is larger than the size of the end of the feed inlet 120 away from the valve chamber 110. The valve core 200 has a closed end corresponding to the feed port 120, and the closed end of the valve core 200 may preferably be substantially frustoconical. Accordingly, when the valve core 200 is sealed at the feeding hole 120, the outer conical surface of the frustum-shaped valve core 200 abuts against the inner conical surface of the frustum-shaped feeding hole 120, thereby realizing the sealing function of the valve core 200 on the feeding hole 120. Through the structural design, the valve core 200 can be effectively prevented from being eccentric by utilizing the matching of the outer conical surface and the inner conical surface, and the sealing reliability is ensured. The above structural design can further optimize the closing effect of the valve element 200 on the feed port 120, and can provide a guiding function for the valve element 200 in the process that the valve element 200 moves towards the feed port 120.

Further, as shown in fig. 4, based on the structure design that the inlet 120 is in the shape of a frustum and the closed end of the valve core 200 is in the shape of a frustum, in the present embodiment, a sealing member 400 may be preferably disposed between the inner conical surface of the inlet 120 and the outer conical surface of the valve core 200. By providing the above structural design, when the closed end of the valve element 200 is closed at the feed port 120, the sealing effect between the two can be further optimized.

For example, as shown in fig. 4, in the present embodiment, a seal 400 is provided on the outer tapered surface of the valve body 200. Further, the seal 400 may be, but is not limited to, a gasket. Correspondingly, the outer conical surface of the valve core 200 is provided with a sealing groove for the sealing ring to be installed in the sealing groove. Through the interface structure shown in fig. 4, it can be seen that a part of the sealing ring (section) is exposed to the sealing groove, so that when the outer conical surface of the valve core 200 is pressed against the inner conical surface of the feed port 120, a seal is formed therebetween by the sealing ring. In other embodiments, the sealing ring may also be disposed in the feed opening 120, for example, in a sealing groove formed in an inner conical surface of the feed opening 120. Alternatively, the valve element 200 and the feed port 120 may be provided with a sealing member, respectively, without being limited to this embodiment.

Alternatively, as shown in fig. 3 and 4, in the present embodiment, the one-way valve proposed by the present invention may preferably include an adjustment nut 500. Specifically, the adjusting nut 500 is disposed in the valve cavity 110, and one end of the pre-tightening elastic structure 300 is connected to the adjusting nut 500 and is relatively connected to the valve body 100 through the adjusting nut 500. On this basis, the cavity wall of the valve cavity 110 is provided with threads for the adjusting nut 500 to be in threaded fit with the valve cavity 110, so that the adjusting nut 500 can be rotated to adjust the axial direction of the valve body 100 relative to the feed port 120, and further adjust the pre-tightening force applied to the valve core 200 by the pre-tightening elastic structure 300. In addition, the adjusting nut 500 is provided with a through hole 510 or a through groove for material circulation. Through the structure design, the utility model discloses can utilize adjusting nut 500 to realize the regulation of the pretightning force that pretension elastic structure 300 applyed to case 200 to can adapt to the use needs under the multiple different work condition.

Further, as shown in fig. 3 and 4, based on the structural design that the check valve includes the adjustment nut 500, in the present embodiment, the adjustment nut 500 may be preferably provided with a hexagon socket 520 toward the center of the discharge hole 130 side surface. Through above-mentioned structural design, can supply the user to utilize outer hexagonal spanner (for example pass discharge gate 130) to adjust nut 500, further optimize the portability to the regulation of pretightning force. In other embodiments, the center of the surface of the adjusting nut 500 facing the discharge hole 130 may also be provided with other structures, such as a straight groove, an inner triangular structure, an outer hexagonal structure, etc., which are not limited by the present embodiment.

Further, as shown in fig. 4, based on the structural design that the check valve includes the adjusting nut 500, in the present embodiment, a surface of the adjusting nut 500 facing the feed inlet 120 may be preferably provided with a clamping groove 530, and the clamping groove 530 can be used for clamping and positioning the pre-tightening elastic structure 300, so that the pre-tightening elastic structure 300 is more stable in the process of rotating or moving along with the adjusting nut 500.

Alternatively, as shown in fig. 4, in the present embodiment, the pre-tensioned elastic structure 300 may preferably be a spring. In other embodiments, the pre-tightening elastic structure 300 may be an elastic structure such as a spring plate or a leaf spring, and is not limited to this embodiment.

Alternatively, as shown in fig. 1 to 4, in the present embodiment, the valve body 100 may preferably include a body 101, a first end cap 102, and a second end cap 103. Specifically, the body 101 is substantially cylindrical in shape, and a cylindrical cavity of the body 101 substantially defines a valve cavity 110 of the valve body 100. The first end cap 102 is removably closed outside a cylindrical opening of the body 101. The second end cap 103 is removably closed outside the other end opening of the body 101. On this basis, the feed inlet 120 may preferably include a first feed inlet 1021, the first feed inlet 1021 is opened in the first end cover 102, and the discharge outlet 130 may preferably include a first discharge outlet 1031, and the first discharge outlet 1031 is opened in the second end cover 103.

Further, as shown in fig. 1 to 4, based on the structural design that the valve body 100 includes the body 101, the first bonnet and the second bonnet, in the present embodiment, the valve body 100 may also preferably include the first gland 104. Specifically, the first pressing cover 104 is removably enclosed in an end socket of the body 101 and abuts against the inside of the first end cover 102. On this basis, the feed inlet 120 may preferably include a second feed inlet 1041, the second feed inlet 1041 is opened in the first gland 104, and the second feed inlet 1041 is communicated with the first feed inlet 1021, that is, the first feed inlet 1021 and the second feed inlet 1041 together form the feed inlet 120.

Further, as shown in fig. 4, based on the structural design that the valve body 100 includes the first gland 104, in the present embodiment, the first gland 104 may be preferably fixed with the body 101 by a screw 106. On the basis of this, the screw 106 can be radially penetrated from the outer wall of the body 101. In other embodiments, the first pressing cover 104 may also be fixed to the body 101 by other connecting members, and the installation position of the connecting member may be flexibly adjusted, which is not limited to this embodiment.

Further, as shown in fig. 4, based on the structural design that the valve body 100 includes the first gland 104, in the present embodiment, a seal may be preferably provided between the first gland 104 and the body 101. Wherein the seal may be, but is not limited to, a gasket. Through the above structural design, the sealing effect between the first gland 104 and the body 101 can be further optimized.

Further, as shown in fig. 4, based on the structural design of the valve body 100 including the first gland 104, in the present embodiment, a seal may be preferably provided between the first gland 104 and the first end cap 102. Wherein the seal may be, but is not limited to, a gasket. Through the above structural design, the sealing effect between the first gland 104 and the first end cap 102 can be further optimized.

Further, as shown in fig. 4, based on the structural design of the feed inlet 120 including the first feed inlet 1021 and the second feed inlet 1041, in the present embodiment, the first feed inlet 1021 may preferably be substantially cylindrical, and the second feed inlet 1041 may preferably be substantially frustum-shaped. On this basis, the inner tapered surface of the second feeding hole 1041 in a frustum shape is the inner tapered surface of the feeding hole 120.

Further, as shown in fig. 4, based on the design that the first feeding hole 1021 is cylindrical and the second feeding hole 1041 is frustum-shaped, in the present embodiment, the size of the larger end of the second feeding hole 1041 may be preferably smaller than or equal to the size of the valve cavity 110 (i.e. the cylinder cavity of the body 101), and the size of the smaller end may be preferably equal to the size of the first feeding hole 1021.

Further, as shown in fig. 1 to 4, based on the structural design that the valve body 100 includes the body 101, the first valve cover and the second valve cover, in the present embodiment, the valve body 100 may also preferably include the second gland 105. Specifically, the second cover 105 is removably sealed in the other end opening of the body 101 and abuts against the inside of the second cover 103. On this basis, the outlet 130 may preferably include a second outlet 1051, the second outlet 1051 is opened in the second cover 105, and the second outlet 1051 is communicated with the first outlet 1031, that is, the first outlet 1031 and the second outlet 1051 together form the outlet 130.

Further, as shown in fig. 4, based on the structural design that the valve body 100 includes the second gland 105, in the present embodiment, the second gland 105 may be preferably fixed with the body 101 by a screw 106. On the basis of this, the screw 106 can be radially penetrated from the outer wall of the body 101. In other embodiments, the second pressing cover 105 may also be fixed to the body 101 by other connecting members, and the installation position of the connecting member may be flexibly adjusted, which is not limited to this embodiment.

Further, as shown in fig. 4, based on the structural design that the valve body 100 includes the second gland 105, in the present embodiment, a sealing member may be preferably provided between the second gland 105 and the body 101. Wherein the seal may be, but is not limited to, a gasket. Through the above structural design, the sealing effect between the second gland 105 and the body 101 can be further optimized.

Further, as shown in fig. 4, based on the structural design that the valve body 100 includes the second gland 105, in the present embodiment, a seal may be preferably provided between the second gland 105 and the second end cap 103. Wherein the seal may be, but is not limited to, a gasket. Through the above structural design, the sealing effect between the second gland 105 and the second end cap 103 can be further optimized.

Further, as shown in fig. 4, based on the structural design that the inlet 120 includes the first outlet 1031 and the second outlet 1051, in the present embodiment, the first outlet 1031 may preferably have a substantially cylindrical shape, and the second outlet 1051 may preferably have a substantially frustum shape.

Further, as shown in fig. 4, based on the structural design that the first discharge port 1031 is in a column shape and the second discharge port 1051 is in a frustum shape, in the present embodiment, the size of the larger end of the second discharge port 1051 may be preferably smaller than or equal to the size of the valve cavity 110 (i.e., the cylinder cavity of the body 101), and the size of the smaller end may be preferably equal to the size of the first discharge port 1031.

Further, as shown in fig. 1 to 4, based on the structural design of the valve body 100 including the first end cap 102 and the second end cap 103, in the present embodiment, the first end cap 102 and the second end cap 103 may preferably be connected by a plurality of fastening screws 140. Specifically, both ends of the fastening screw 140 are detachably fixed to the first end cap 102 and the second end cap 103 by a structure such as a nut. In the present embodiment, the first end cap 102 and the second end cap 103 are connected by four fastening screws 140. Through the above structure design, the utility model discloses can utilize fastening screw 140 to closely install first end cap 102 and second end cap 103 at the both ends of body 101. In other embodiments, other connection structures may be used to connect the first end cap 102 and the body 101 and the second end cap 103 and the body 101, respectively. When the fastening screws 140 are used, the number and distribution of the fastening screws 140 can be flexibly adjusted, and the present embodiment is not limited thereto.

It should be noted herein that the check valves shown in the drawings and described in the present specification are but a few examples of the many types of check valves that can employ the principles of the present invention. It should be clearly understood that the principles of the present invention are in no way limited to any of the details of the check valve or any of the components of the check valve shown in the drawings or described in the specification.

Based on the above detailed description of an exemplary embodiment of the check valve, an exemplary embodiment of the static vacuum casting apparatus of the present invention will be described below.

In this embodiment, the present invention provides a static vacuum casting apparatus comprising a metering pump, a casting line and the check valve provided by the present invention and described in detail in the above embodiments. On the basis, the feed inlet of the one-way valve is communicated with the metering pump, and the discharge outlet of the one-way valve is communicated with the pouring pipeline.

Alternatively, as shown in fig. 1 to 4, in the present embodiment, based on the structural design that the valve body 100 of the check valve includes the first end cap 102, in the present embodiment, the first end cap 102 may preferably be provided with mounting bolts 150, and the mounting bolts 150 may be capable of mounting the check valve on a substrate, which may be, for example, a mounting seat of a metering pump or other mounting structure of a static vacuum casting device.

Based on the above-mentioned detailed description to the exemplary embodiment of the static vacuum casting apparatus provided by the present invention, it will be right below that the working process of the check valve provided by the present invention in this static vacuum casting apparatus is explained.

In the initial state (i.e. the above-mentioned "normal state"), the valve core of the check valve is pressed on the feed port under the action of the pre-tightening force of the pre-tightening elastic structure, and the valve core is in a sealed state. When the piston of the metering pump moves downwards to convey materials (such as resin and curing agent) to the feed inlet through the pipeline, the valve core moves upwards under the pressure of the materials in the pipeline, and the one-way valve is in an open state at the moment. When the piston of the metering pump moves upwards, the pressure in the pipeline disappears, the valve core of the one-way valve is re-closed at the feed inlet under the pre-tightening force of the pre-tightening elastic structure, the material in the pipeline is prevented from flowing back, the one-way valve returns to the initial state at the moment, and the material conveying which is suitable for the working requirement of the static vacuum casting equipment can be completed by the reciprocating operation.

It should be noted herein that the static vacuum casting apparatus illustrated in the drawings and described in the present specification are but a few examples of the many types of static vacuum casting apparatus that can employ the principles of the present invention. It should be clearly understood that the principles of the present invention are in no way limited to any details of the static vacuum casting apparatus or any components of the static vacuum casting apparatus shown in the drawings or described in the specification.

To sum up, the utility model provides a check valve through set up pretension elastic construction in the valve pocket, connects pretension elastic construction one end in the valve body relatively, and the other end is connected in the case of valve intracavity. Therefore, the pretightening force towards the feed port can be applied to the valve core through the pretightening elastic structure, so that the feed port is closed by the valve core under a normal state. Through the structure design, the utility model provides a check valve realizes the normal close formula design of valve, adopts the pretension to seal and has replaced current pneumatic seal, adopts passive pressure to open and close and has replaced current active control and open and close to can satisfy the material transport requirement of measuring pump periodic type, in addition, the utility model discloses effective reduce cost retrencies control, has improved the reliability of valve.

Exemplary embodiments of the check valve and static vacuum casting apparatus proposed by the present invention are described and/or illustrated in detail above. Embodiments of the invention are not limited to the specific embodiments described herein, but rather, components and/or steps of each embodiment may be utilized independently and separately from other components and/or steps described herein. Each component and/or step of one embodiment can also be used in combination with other components and/or steps of other embodiments. When introducing elements/components/etc. described and/or illustrated herein, the articles "a," "an," and "the" are intended to mean that there are one or more of the elements/components/etc. The terms "comprising," "including," and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc. Furthermore, the terms "first" and "second" and the like in the claims and the description are used merely as labels, and are not numerical limitations of their objects.

While the present invention has been described in terms of various specific embodiments, those skilled in the art will recognize that the invention can be practiced with modification within the spirit and scope of the claims.

Claims (10)

1. A one-way valve, comprising:

the valve body is provided with a valve cavity, and a feed inlet and a discharge outlet which are communicated with the valve cavity;

the valve core is arranged in the valve cavity;

and the pre-tightening elastic structure is arranged in the valve cavity, one end of the pre-tightening elastic structure is relatively connected to the valve body, and the other end of the pre-tightening elastic structure is connected to the valve core so as to apply pre-tightening force towards the feed port to the valve core, so that the feed port is closed by the valve core under a normal state.

2. The check valve of claim 1, wherein the feed port is frustoconical, and the size of the feed port is larger at an end adjacent to the valve chamber than at an end away from the valve chamber; the valve core is provided with a closed end corresponding to the feeding hole, and the closed end is in a frustum shape; when the valve core is sealed at the feed port, the outer conical surface of the valve core is abutted against the inner conical surface of the feed port to realize sealing.

3. The check valve of claim 2, wherein the inner tapered surface of the inlet and/or the outer tapered surface of the poppet are provided with a seal.

4. The one-way valve of claim 1, further comprising:

the adjusting nut is arranged in the valve cavity, and one end of the pre-tightening elastic structure is connected to the adjusting nut and is relatively connected to the valve body through the adjusting nut;

the cavity wall of the valve cavity is provided with threads so that the adjusting nut is in threaded fit with the valve cavity and can be adjusted relative to the feeding hole, and then the pretightening force applied to the valve core by the pretightening elastic structure is adjusted.

5. The one-way valve of claim 1, wherein the valve body comprises:

the body is of a cylindrical structure, and a cylindrical cavity of the body defines the valve cavity;

the first end cover is detachably sealed outside a cylinder opening at one end of the body; and

the second end cover is detachably sealed outside the other end cylinder opening of the body;

wherein, the feed inlet contains to be seted up in the first feed inlet of first end cover, the discharge gate contains to be seted up in the first discharge gate of second end cover.

6. The one-way valve of claim 5, wherein the valve body further comprises:

the first gland is detachably sealed in an end socket of the body and is adjacent to the inner side of the first end cap;

wherein, the feed inlet contains to set up in the second feed inlet of first gland, the second feed inlet communicate in first feed inlet.

7. The check valve of claim 6, wherein the first feed port is cylindrical and the second feed port is frustoconical.

8. The one-way valve of claim 5, wherein the valve body further comprises:

the second gland is detachably sealed in the barrel opening at the other end of the body and is adjacent to the inner side of the second end cover;

the discharge port comprises a second discharge port arranged on the second gland, and the second discharge port is communicated with the first discharge port.

9. The check valve of claim 8, wherein the first outlet is cylindrical and the second outlet is frustoconical.

10. A static vacuum casting apparatus, comprising:

metering pumps and pouring pipelines; and

a one-way valve as claimed in any one of claims 1 to 9;

the feeding hole of the one-way valve is communicated with the metering pump, and the discharging hole of the one-way valve is communicated with the pouring pipeline.

Images