An ultra-low temperature hard-sealed fixed ball valve

Abstract

The present application relates to an ultra-low temperature hard-sealed fixed ball valve, which relates to the technical field of valves, and comprises a valve body, a valve ball, a valve stem and a valve cover fixedly arranged on the valve body, wherein a flow channel is opened in the valve body, a mounting cavity located in the middle of the flow channel and for inserting the valve ball, a valve seat for limiting the valve ball is arranged on the inner wall of the mounting cavity, one end of the valve stem penetrates the valve cover and is inserted into the valve body and is coaxially fixedly connected to the valve ball, and an operating mechanism is fixedly arranged on the other end of the valve stem; a pressure ring is provided on the side of the valve seat away from the valve ball, a mounting ring groove for inserting the pressure ring and the valve seat is opened on the inner wall of the mounting cavity around the axial direction of the flow channel, and a plurality of compression springs in a compressed state are arranged on the side of the pressure ring away from the valve seat; in the present application, the compression spring in a compressed state continuously squeezes the pressure ring, thereby making one side of the valve seat press against the outer peripheral surface of the valve ball, reducing the possibility of a gap between the valve seat and the valve ball due to loosening of the pressing, and improving the sealing performance of the ball valve when it is used.

Description

Technical Field

[0001] The present application relates to the technical field of valves, and in particular to an ultra-low temperature hard-sealed fixed ball valve. Background Art

[0002] Ultra-low temperature hard-sealed fixed ball valves, as the core components of fluid control in extremely low temperature environments, are specially designed for cryogenic fluid pipeline systems that have extremely high requirements for sealing and operational stability. With their excellent performance, these valves play an indispensable role in the cryogenic industry, ensuring the safe and efficient transmission of fluids under extreme conditions.

[0003] At present, the design of ultra-low temperature top-entry ball valve is relatively mature, and its structure mainly includes key components such as valve body, valve cover, valve stem and operating mechanism. The carefully designed flow channel in the valve body and the detachable valve cover together constitute the main channel of the fluid. In the middle cavity of the valve body, the valve ball and the valve seat are closely matched, and the valve ball is driven to rotate by the rotation of the valve stem to realize the opening and closing of the flow channel. Inside the valve cover, there is also a packing cavity filled with special packing to further enhance the sealing effect.

[0004] However, despite the significant progress made in the existing technology, challenges still exist in practical applications. In particular, after long-term operation, due to the continuous impact and wear of the cryogenic fluid medium on the contact surface of the valve seat and the valve ball, the tight contact between the two may gradually loosen, becoming a potential leakage risk point; when the ball valve is closed, the cryogenic fluid medium may leak from the worn gap, and there is room for improvement. Summary of the invention

[0005] The purpose of the present application is to provide an ultra-low temperature hard-sealed fixed ball valve to solve the problem in the above-mentioned related art that the above-mentioned ball valve may leak fluid medium in the closed state after long-term use.

[0006] The ultra-low temperature hard-sealed fixed ball valve provided in this application adopts the following technical solution:

[0007] A super-low temperature hard-sealed fixed ball valve comprises a valve body, a valve ball, a valve stem and a valve cover fixedly mounted on the valve body, a flow channel and an installation cavity located in the middle of the flow channel for inserting the valve ball within the valve body, a valve seat for limiting the valve ball is arranged on the inner wall of the installation cavity, one end of the valve stem passes through the valve cover and is inserted into the valve body and is coaxially fixedly connected to the valve ball, an operating mechanism is fixedly mounted on the other end of the valve stem; a pressure ring is arranged on the side of the valve seat away from the valve ball, an installation ring groove for inserting the pressure ring and the valve seat is arranged on the inner wall of the installation cavity around the axial direction of the flow channel, and a plurality of compression springs in a compressed state are arranged on the side of the pressure ring away from the valve seat.

[0008] By adopting the above technical scheme, during the application of the ball valve, the user can control the rotation of the valve stem through the operating mechanism, thereby controlling the rotation of the valve ball and controlling the on-and-off of the flow channel; in addition, due to the matching arrangement of the compression spring and the pressure ring, the compression spring in a compressed state continuously squeezes the pressure ring, thereby making one side of the valve seat press against the outer peripheral surface of the valve ball, reducing the possibility of a gap between the valve seat and the valve ball due to loosening of the pressing, thereby improving the sealing performance of the ball valve during application.

[0009] Optionally, a mounting recess for inserting a compression spring is provided on the side of the pressure ring away from the valve seat, and two ends of the compression spring are respectively pressed against the bottom side of the mounting recess and the side wall of the mounting ring groove.

[0010] By adopting the above technical solution, due to the setting of the installation groove, the compression spring can be placed in the corresponding installation groove in advance, thereby improving the installation stability of the compression spring and reducing the possibility of displacement or dislocation of the compression spring during the extrusion process.

[0011] Optionally, a fixed clamping ring is fixed on the outer edge of the side of the pressure ring facing the valve seat, and an annular clamping groove is provided on the valve seat for inserting the fixed clamping ring; a fixed convex ring is fixed on the inner wall of the side of the pressure ring away from the valve seat, and an annular groove is provided on the inner wall of the installation cavity for inserting the fixed convex ring.

[0012] By adopting the above technical solution, when the pressure ring is assembled, the fixed clamping ring is inserted into the corresponding annular clamping groove, and the fixed convex ring is inserted into the corresponding annular groove, so as to improve the installation stability of the pressure ring in the valve body.

[0013] Optionally, a first sealing ring inserted into the annular groove is fixedly provided in the valve body, and one side of the fixed clamping ring is tightly pressed against the first sealing ring.

[0014] By adopting the above technical solution, when the fixing clamp ring is inserted into the annular groove, due to the installation setting of the first sealing ring, one side of the fixing clamp ring is pressed against the first sealing ring, thereby sealing the gap between the pressure ring and the inner wall of the installation ring groove, thereby improving the corresponding sealing performance.

[0015] Optionally, an annular mounting groove is opened on the inner wall edge of the annular groove facing the pressure ring, and a second sealing ring is fixed in the annular mounting groove. One side of the second sealing ring abuts against the side of the pressure ring away from the valve seat, and an opening is opened on the side of the second sealing ring facing the axis of the flow channel.

[0016] By adopting the above technical solution, due to the installation setting of the second sealing ring, when the second sealing ring is installed, one side of the second sealing ring abuts against the side of the pressure ring away from the valve seat, and the other side is fixedly connected to the annular mounting groove, thereby improving the sealing performance between the fixed convex ring and the annular groove, and then enhancing the overall sealing performance of the ball valve.

[0017] Optionally, an insert ring groove is provided on the inner edge of the side surface of the valve seat facing the pressure ring, and a first spring in an extrusion state is provided inside the insert ring groove, and two ends of the first spring are respectively fixedly connected to the inner wall of the insert ring groove and abut against one side of the pressure ring; a positioning ring groove is provided on the side wall of the mounting ring groove, and a second spring in an extrusion state is provided inside the positioning ring groove, and two ends of the second spring are respectively fixedly connected to the inner wall of the positioning ring groove and abut against the side of the pressure ring away from the valve seat.

[0018] By adopting the above technical solution, due to the installation arrangement of the first spring and the second spring, the extrusion force on the pressure ring is strengthened, and at the same time, the clamping force of the pressure ring on the valve seat and the valve seat on the ball valve is also improved, thereby reducing the possibility of a gap between the valve seat and the ball valve due to loose abutment, thereby improving the sealing performance of the ball valve during use.

[0019] Optionally, the side of the pressure ring away from the valve seat can be flipped to a state of being in contact with the side of the valve seat; after the pressure ring is flipped, the fixed convex ring can be inserted into the ring groove and pressed against the first spring, and the fixed clamping ring can be inserted into the positioning ring groove and pressed against the second spring.

[0020] By adopting the above technical solution, when the pressure ring is flipped, the fixed convex ring further presses against the first spring, the fixed clamping ring further presses against the second spring, and one end of the compression spring presses against the side of the valve seat facing the pressure ring, so that the pressure ring has a greater pressing force on the valve seat; therefore, the state of the pressure ring can be adjusted according to the actual application scenarios of the ball valve, thereby improving the application range and performance of the ball valve.

[0021] Optionally, a third sealing ring is provided inside the annular groove, and an opening is provided on the side of the third sealing ring close to the pressure ring.

[0022] By adopting the above technical solution, when the pressure ring needs to be adjusted to a flipped state for application, the third sealing ring is inserted into the annular groove to further seal the gap between the pressure ring and the inner wall of the mounting annular groove, thereby improving the corresponding sealing performance.

[0023] Optionally, a wear-resistant layer is fixedly provided on the side of the valve seat facing the valve ball.

[0024] By adopting the above technical solution, due to the provision of the wear-resistant layer, the possibility of the ball valve itself being worn when rotating relative to the valve seat is reduced, thereby extending the service life of the valve seat.

[0025] Optionally, a drip plate is fixedly provided on the outer peripheral surface of the valve cover.

[0026] By adopting the above technical solution, due to the installation of the drip plate, in an ultra-low temperature environment, low-temperature media or condensed water may accumulate in the valve components and surrounding areas, posing a risk of cold burns to operators. The drip plate reduces this risk by reducing the generation and accumulation of condensed water.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. Due to the matching setting of the compression spring and the compression ring, the compression spring in the compressed state continuously squeezes the compression ring, so that one side of the valve seat is pressed against the outer peripheral surface of the valve ball, reducing the possibility of a gap between the valve seat and the valve ball due to loosening of the pressing, and improving the sealing performance of the ball valve when used.

[0029] 2. When the pressure ring is flipped, the fixed convex ring further presses against the first spring, the fixed clamping ring further presses against the second spring, and one end of the compression spring presses against the side of the valve seat facing the pressure ring, so that the pressure ring has a greater pressing force on the valve seat; therefore, the state of the pressure ring can be adjusted according to the actual application scenarios of the ball valve, thereby improving the application range and performance of the ball valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 It is a side view structural diagram of the installation and matching of the ball valve in Example 1 of the present application;

[0032] Figure 2 It is a manifestation Figure 1 Schematic diagram of the cross-sectional structure in the AA direction;

[0033] Figure 3 yes Figure 2 A magnified schematic diagram of part A;

[0034] Figure 4 This is a partial cross-sectional structural schematic diagram of Example 2 of the present application when the pressure ring is normally installed;

[0035] Figure 5 It is a schematic diagram of the partial cross-sectional structure of Example 2 of the present application when the pressure ring is installed in reverse.

[0036] In the figure, 1, valve body; 11, flow channel; 12, installation cavity; 121, installation ring groove; 1211, positioning ring groove; 122, annular groove; 1221, annular installation groove; 13, second sealing ring; 14, second spring; 2, valve ball; 3, valve stem; 31, operating mechanism; 4, valve cover; 41, drip plate; 5, valve seat; 51, wear-resistant layer; 52, annular groove; 53, first sealing ring; 54, inserted ring groove; 55, first spring; 56, third sealing ring; 6, pressure ring; 61, installation sink groove; 62, fixing clamp ring; 63, fixing convex ring; 7, compression spring. DETAILED DESCRIPTION

[0037] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0038] Embodiment 1:

[0039] Reference Figure 1 and Figure 2 , an ultra-low temperature hard-sealed fixed ball valve, comprising a valve body 1, a valve ball 2, a valve stem 3 and a valve cover 4 fixed on the valve body 1, wherein the valve body 1 is provided with a flow channel 11, a mounting cavity 12 located in the middle of the flow channel 11 and for the valve ball 2 to be placed, and valve seats 5 for limiting the two sides of the valve ball 2 are symmetrically mounted on the inner wall of the mounting cavity 12;

[0040] One end of the valve stem 3 passes through the valve cover 4 and is inserted into the valve body 1 and is coaxially fixedly connected with the valve ball 2. An operating mechanism 31 is fixedly arranged at the other end of the valve stem 3, wherein the operating mechanism 31 is a combination structure of a conventional gear box and a hand wheel, which will not be described in detail here. The user can control the rotation of the valve stem 3 through the operating mechanism 31, and then control the rotation of the valve ball 2 to control the on-off of the flow channel 11.

[0041] Reference Figure 1 and Figure 2 A drip plate 41 is fixed on the outer peripheral surface of the valve cover 4; in an ultra-low temperature environment, low-temperature medium or condensed water may accumulate in the valve components and surrounding areas, posing a risk of cold burns to operators. The drip plate 41 reduces this risk by reducing the generation and accumulation of condensed water.

[0042] Reference Figure 2 and Figure 3 A pressing ring 6 is provided on the side of the valve seat 5 away from the valve ball 2, wherein an installation annular groove 121 for inserting the pressing ring 6 and the valve seat 5 is provided on the inner wall of the installation cavity 12 around the axial direction of the flow channel 11, and a plurality of compression springs 7 in a compressed state are distributed on the side of the pressing ring 6 away from the valve seat 5, and installation recessed grooves 61 for inserting the compression springs 7 are evenly provided on the side of the pressing ring 6 away from the valve seat 5;

[0043] When the ball valve is assembled, the two ends of the compression spring 7 are respectively pressed against the bottom side of the mounting groove 61 and the side wall of the mounting ring groove 121, thereby pressing one side of the valve seat 5 against the outer peripheral surface of the valve ball 2. A wear-resistant layer 51 is fixed on the side of the valve seat 5 facing the valve ball 2, thereby reducing the possibility of wear of the ball valve itself when rotating relative to the valve seat 5, and extending the service life of the valve seat 5.

[0044] Reference Figure 2 and Figure 3 A fixing clamp ring 62 is integrally formed on the outer edge of the side of the pressure ring 6 facing the valve seat 5, wherein the valve seat 5 is provided with an annular groove 52 for inserting the fixing clamp ring 62; a first sealing ring 53 inserted into the annular groove 52 is fixedly provided in the valve body 1, and the first sealing ring 53 is made of rubber; when the fixing clamp ring 62 is inserted into the annular groove 52, one side of the fixing clamp ring 62 is tightly pressed against the first sealing ring 53.

[0045] Reference Figure 2 and Figure 3 A fixing convex ring 63 is integrally formed on the inner wall of the side of the pressure ring 6 away from the valve seat 5, and an annular groove 122 for inserting the fixing convex ring 63 is opened on the inner wall of the installation cavity 12; when the pressure ring 6 is assembled, the fixing convex ring 63 is inserted into the corresponding annular groove 122, so as to improve the installation stability of the pressure ring 6 in the valve body 1.

[0046] The implementation principle of the embodiment of the present application is:

[0047] During the application of the ball valve, the compression spring 7 in the compressed state squeezes the pressure ring 6, thereby keeping the pressure ring 6 pressed against the valve seat 5, and the wear-resistant layer 51 on the valve seat 5 keeps the valve ball 2 in a tight state, which not only reduces the possibility of wear of the valve seat 5, but also reduces the possibility of a gap between the valve seat 5 and the valve ball 2 due to loosening of the tight contact.

[0048] Embodiment 2:

[0049] Reference Figure 4 and Figure 5 The difference between the embodiment of the present application and embodiment 1 is that an annular mounting groove 1221 is provided on the inner wall edge of the annular groove 122 facing the pressure ring 6, wherein a second sealing ring 13 made of rubber is fixed in the annular mounting groove 1221 by glue, and an opening is provided on the side of the second sealing ring 13 facing the axis of the flow channel 11; when the second sealing ring 13 is installed, one side of the second sealing ring 13 abuts against the side of the pressure ring 6 away from the valve seat 5, and the other side is fixedly connected to the annular mounting groove 1221.

[0050] Reference Figure 4The valve seat 5 is provided with an insert ring groove 54 on the inner edge of the side facing the pressure ring 6, wherein the first spring 55 in a squeezed state is evenly distributed inside the insert ring groove 54, wherein the two ends of the first spring 55 are respectively fixedly connected to the inner wall of the insert ring groove 54 and abut against one side of the pressure ring 6;

[0051] A positioning ring groove 1211 is provided on the side wall of the mounting ring groove 121. A second spring 14 in a squeezed state is provided inside the positioning ring groove 1211. Both ends of the second spring 14 are respectively fixedly connected to the inner wall of the positioning ring groove 1211 and pressed against the side of the pressing ring 6 away from the valve seat 5. This increases the pressing force of the pressing ring 6 against the valve seat 5 and the valve seat 5 against the ball valve, reduces the possibility of a gap between the valve seat 5 and the ball valve due to loosening of the abutment, and improves the sealing performance of the ball valve when in use.

[0052] Reference Figure 5 , the side of the pressure ring 6 away from the valve seat 5 can be flipped to a state of being in contact with the side of the valve seat 5, that is, the pressure ring 6 can be flipped 180 degrees and then fixed in the installation cavity 12; when the pressure ring 6 is flipped, the fixed convex ring 63 can be inserted into the inserted ring groove 54 and pressed against the first spring 55, and the fixed snap ring 62 can be inserted into the positioning ring groove 1211 and pressed against the second spring 14; when the pressure ring 6 is flipped, the fixed convex ring 63 further presses against the first spring 55, and the fixed snap ring 62 further presses against the second spring 14, and one end of the compression spring 7 presses against the side of the valve seat 5 facing the pressure ring 6, so that the pressure ring 6 has a greater pressing force on the valve seat 5.

[0053] When the ball valve is used in a scenario where the impact force of the conveyed medium from the valve ball 2 is relatively large, the pressure ring 6 can be turned over to give it a greater pressing force on the valve seat 5, further enhancing the sealing performance of the ball valve; when the ball valve is used in a scenario where the impact force is not strong, the compression spring 7 can be kept in its original state; in addition, the pressure ring 6 can be turned over on the medium inlet side of the flow channel 11, and the pressure ring 6 can be kept in its original state on the outlet side. The state of the pressure ring 6 is not unique and can be adjusted according to actual needs.

[0054] Reference Figure 5 A third sealing ring 56 made of rubber is provided inside the annular groove 52, and an opening is provided on the side of the third sealing ring 56 facing the pressure ring 6; when the pressure ring 6 needs to be adjusted to a 180-degree flipped state for application, the third sealing ring 56 is inserted into the annular groove 52 to further seal the gap between the pressure ring 6 and the inner wall of the mounting ring groove 121, thereby improving the corresponding sealing performance.

[0055] The implementation principle of the embodiment of the present application is:

[0056] The state of the pressing ring 6 can be adjusted according to different actual application scenarios of the ball valve. When the ball valve is used in a scenario where the impact force of the conveyed medium from the valve ball 2 is large, the pressing ring 6 can be turned over to have a greater pressing force on the valve seat 5, further enhancing the sealing performance of the ball valve; when the ball valve is used in a scenario where the impact force is not strong, the compression spring 7 can be kept in its original state.

[0057] Unless otherwise defined, the terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The "first", "second", "third" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and other similar words do not indicate a quantitative limit, but indicate that there is at least one. "Including" or "comprising" and other similar words mean that the elements or objects appearing in front of "including" or "comprising" cover the elements or objects listed after "including" or "comprising" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0058] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A cryogenic hard-sealed fixed ball valve, comprising a valve body (1), a valve ball (2), a valve stem (3) and a valve cover (4) fixedly mounted on the valve body (1); a flow channel (11) and a mounting cavity (12) located in the middle of the flow channel (11) for the valve ball (2) to be placed therein; a valve seat (5) for limiting the position of the valve ball (2) is provided on the inner wall of the mounting cavity (12); one end of the valve stem (3) passes through the valve cover (4) and is then inserted into the valve body (1) and is coaxially fixedly connected with the valve ball (2); an operating mechanism (31) is fixedly mounted on the other end of the valve stem (3); It is characterized in that A pressure ring (6) is provided on the side of the valve seat (5) away from the valve ball (2); a mounting ring groove (121) for the pressure ring (6) and the valve seat (5) to be placed is provided on the inner wall of the mounting cavity (12) around the axial direction of the flow channel (11); and a plurality of compression springs (7) in a compressed state are provided on the side of the pressure ring (6) away from the valve seat (5); A fixed clamping ring (62) is fixedly provided on the outer edge of the side surface of the pressure ring (6) facing the valve seat (5), and an annular clamping groove (52) is provided on the valve seat (5) for inserting the fixed clamping ring (62); a fixed convex ring (63) is fixedly provided on the inner wall of the side surface of the pressure ring (6) away from the valve seat (5), and an annular groove (122) is provided on the inner wall of the installation cavity (12) for inserting the fixed convex ring (63); A first sealing ring (53) inserted into the annular groove (52) is fixedly provided in the valve body (1), and one side of the fixed clamping ring (62) is tightly abutted against the first sealing ring (53); an annular mounting groove (1221) is provided on the inner wall edge of the annular groove (122) facing the pressure ring (6), and a second sealing ring (13) is fixedly provided in the annular mounting groove (1221), one side of the second sealing ring (13) is abutted against the side of the pressure ring (6) away from the valve seat (5), and an opening is provided on the side of the second sealing ring (13) facing the axis of the flow channel (11); The valve seat (5) is provided with an insertion ring groove (54) on the inner edge of the side surface facing the pressure ring (6), and a first spring (55) in a squeezed state is provided inside the insertion ring groove (54), and two ends of the first spring (55) are respectively fixedly connected to the inner wall of the insertion ring groove (54) and abut against one side of the pressure ring (6); a positioning ring groove (1211) is provided on the side wall of the installation ring groove (121), and a second spring (14) in a squeezed state is provided inside the positioning ring groove (1211), and two ends of the second spring (14) are respectively fixedly connected to the inner wall of the positioning ring groove (1211) and abut against the side of the pressure ring (6) away from the valve seat (5); The side of the pressure ring (6) away from the valve seat (5) can be flipped to a state where it fits the side of the valve seat (5); after the pressure ring (6) is flipped, the fixed convex ring (63) can be inserted into the annular groove (54) and pressed against the first spring (55), and the fixed clamping ring (62) can be inserted into the positioning annular groove (1211) and pressed against the second spring (14); a third sealing ring (56) is provided inside the annular clamping groove (52), and the third sealing ring (56) is provided with an opening on the side facing the pressure ring (6).

2. The ultra-low temperature hard-sealed fixed ball valve according to claim 1, characterized in that: A mounting recess (61) for inserting a compression spring (7) is provided on the side of the pressure ring (6) away from the valve seat (5), and two ends of the compression spring (7) are respectively pressed against the bottom side of the mounting recess (61) and the side wall of the mounting ring groove (121).

3. The ultra-low temperature hard-sealed fixed ball valve according to claim 1, characterized in that: A wear-resistant layer (51) is fixedly provided on the side of the valve seat (5) facing the valve ball (2).

4. The ultra-low temperature hard-sealed fixed ball valve according to claim 1, characterized in that: A drip plate (41) is fixedly provided on the outer peripheral surface of the valve cover (4).

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