Seat-type back pressure valve

Abstract

This application relates to the field of fluid chemistry technology, and particularly to a seat-type back pressure valve, comprising a top cover, a middle tube, and a base. The base has a first inlet channel inside, and an inlet port and an outlet port on its sides, the inlet port communicating with the first inlet channel. The middle tube has a second inlet channel inside, and an outlet channel within its wall. A first outlet branch extending to the outside of the tube wall and communicating with the second inlet channel is formed on the upper side wall of the middle tube. A second outlet branch extending to the outlet channel and communicating with the outlet channel is formed on the middle side wall of the middle tube from the outside in. A back pressure sleeve is fitted around the outer periphery of the middle tube. The top cover is fitted around the outer periphery of the middle tube, and its bottom is fastened to the base. The seat-type back pressure valve proposed in this application, through the structural design of the middle tube and the cooperation between the middle tube and the back pressure sleeve, can effectively filter out powdery solids in a gas-liquid mixture.

Description

Technical Field

[0001] This application relates to the field of fluid chemistry technology, and more particularly to a seated back pressure valve. Background Technology

[0002] Fluid chemistry mainly studies chemical reactions, mass transport, and related physicochemical phenomena in fluids (including liquids, gases, and powdered solids). It involves knowledge from multiple disciplines such as chemical engineering, physical chemistry, and materials science. Through precise control and operation of fluid systems, it enables efficient chemical reactions, separation and purification of substances, and preparation of new materials.

[0003] In fluid chemistry research, reaction conditions are typically high temperature and high pressure to increase reaction rates. Back pressure valves are usually used to ensure precise control of reactant supply. However, in the mixing and transport of gas-liquid mixtures, which may be formed after pre-reaction with solid reactants, powdery solid deposits often occur during transport. Furthermore, existing back pressure valves are usually large-scale, lacking sufficient control precision, and are unsuitable for fluid chemistry. Moreover, the structure and shape of the back pressure valve often vary depending on the reaction equipment connected to it. Summary of the Invention

[0004] In view of this, the purpose of this application is to propose a seat-type back pressure valve to solve the technical problem that the back pressure valves in the prior art are not applicable or universal in the field of fluid chemistry.

[0005] To achieve the above objectives, this application proposes a seated back pressure valve, comprising:

[0006] Top cover, middle tube, and base;

[0007] The top cover has an inner cavity, and a back pressure air interface is provided on the top of the top cover, which is connected to the inner cavity; the base has a first liquid inlet channel inside, and a liquid inlet interface and a liquid outlet interface are respectively provided on the side of the base, which are connected to the first liquid inlet channel; a connecting seat is provided on the top of the base, and the bottom of the connecting seat is open, which is connected to the first liquid inlet channel; the middle tube has a second liquid inlet channel inside, and a liquid outlet channel is provided inside the tube wall of the middle tube; a first liquid outlet branch is opened on the upper side wall of the middle tube, which is connected to the second liquid inlet channel and extends to the outside of the tube wall; a second liquid outlet branch is opened from the outside to the inside on the middle side wall of the middle tube, which extends to the liquid outlet channel and is connected to the liquid outlet channel; the outlet of the liquid outlet channel is located at the bottom of the middle tube; the top of the middle tube is closed, and a back pressure rubber sleeve is fitted on the outer periphery of the middle tube;

[0008] One end of the intermediate tube is disposed inside the connecting seat, the upper cover is sleeved on the outer periphery of the intermediate tube, and the bottom of the upper cover is fastened to the base.

[0009] In some embodiments, the back pressure diaphragm is made of one of FFKM, PFA, PTFE, FMA or stainless steel.

[0010] In some embodiments, the top of the intermediate tube is closed by a locking screw.

[0011] In some embodiments, a first groove is provided axially on the threaded rod of the locking screw at the position corresponding to the first liquid outlet channel.

[0012] In some embodiments, the outer periphery of the connector is provided with a first annular protrusion.

[0013] In some embodiments, a second annular protrusion is provided on the inner sidewall of the top cover at a position corresponding to the annular protrusion.

[0014] In some embodiments, the position on the back pressure sleeve corresponding to the first annular protrusion is concave, corresponding to the first annular protrusion.

[0015] In some embodiments, the intermediate tube is connected to the connecting seat by a thread, and a second groove is provided axially on the thread of the intermediate tube at the connection.

[0016] In some embodiments, the base is provided with a third liquid outlet channel communicating with the liquid outlet interface, and the inlet of the liquid outlet channel is located on the top surface of the base at a position corresponding to the second groove.

[0017] In some embodiments, a sealing ring is also provided at the connection between the intermediate tube and the connector.

[0018] The seat-type back pressure valve provided in the application embodiment has a back pressure diaphragm that is resistant to high temperature and high pressure, and has a small overall size, which can meet the needs of the fluid chemistry field. Through the tight fastening of the base and the upper pressure cover, it can meet the high pressure resistance requirements of the fluid chemistry field. Through the precise cooperation of the base, the upper pressure cover and the back pressure diaphragm, it can meet the sealing requirements under high pressure conditions. At the same time, through the structural design of the intermediate tube and the cooperation between the intermediate tube and the back pressure rubber sleeve, it can effectively filter out powdery solids in the gas-liquid mixture while ensuring control accuracy. Attached Figure Description

[0019] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0020] Figure 1 This is an exploded view of the seat-type back pressure valve in the embodiments of this application;

[0021] Figure 2 This is a cross-sectional view of the back pressure valve in the embodiments of this application. Detailed Implementation

[0022] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] like Figure 1 The figure shown is an exploded view of the seat-type back pressure valve in an embodiment of this application; Figure 2 This is a cross-sectional view of the back pressure valve in an embodiment of this application. From Figure 1 and Figure 2 As can be seen from the above, the seated back pressure valve of this embodiment includes:

[0025] The upper cover 1, the intermediate tube 4, and the base 5 are used. In the embodiments of this application, the overall sealing of the back pressure valve is achieved by the fastening of the upper cover 1 and the base 5. The upper cover 1 can be connected to an external back pressure air source to achieve back pressure. The gas-liquid mixture flows through the intermediate tube 4 under back pressure, thereby ensuring the pressure of the gas-liquid mixture.

[0026] Specifically, in this embodiment, the upper cover 1 has an inner cavity, and a back pressure gas interface 101 is provided on the top of the upper cover 1 for connecting to an external back pressure gas source. The pressure of the gas-liquid mixture is ensured by the external back pressure gas source; that is, the mixture cannot pass through if the pressure is less than the pressure provided by the external back pressure gas source. The back pressure gas interface 101 is connected to the inner cavity. It is conceivable that the back pressure gas interface 101 can be located at other positions on the upper cover; as long as it is connected to the inner cavity, the purpose of back pressure can be achieved. This embodiment is merely an optional embodiment among several embodiments to illustrate the technical solution of this application and should not be construed as limiting the technical solution of this application.

[0027] The base 5 has a first liquid inlet channel 403 inside, and a liquid inlet port 501 and a liquid outlet port 502 are respectively provided on the side of the base 5. The liquid inlet port 501 is connected to the first liquid inlet channel 403. In this embodiment, the liquid inlet port 501 can be a conical interface with threads, and a sealing ring can also be provided inside the interface. The threads can achieve a stable connection under high pressure, and the sealing ring can achieve a seal under high pressure. Similarly, the liquid outlet port 502 can also be designed in this way, which will not be described in detail here.

[0028] The base 5 has a connecting seat 503 at its top, and the connecting seat 503 has an opening at its bottom, which communicates with the first liquid inlet channel 403. In this embodiment, the base 5 can be a disc-shaped structure, and the liquid inlet port 501 and the liquid outlet port 502 can be arranged opposite each other, in a direction along approximately the same diameter of the base 5. Alternatively, the base 5 can be configured with other shapes as needed. The first liquid inlet channel 403 can be vertically upward from the center of the base 5, and the liquid inlet port 501 extends to communicate with the first liquid inlet channel 403. The connecting seat 503 can be positioned above the first liquid inlet channel 403.

[0029] The intermediate tube 4 has a second liquid inlet channel 405 inside. The second liquid inlet channel 405 can be aligned with the axis of the first liquid inlet channel 403, and the inner diameter of the second liquid inlet channel 405 can be the same as the inner diameter of the first liquid inlet channel 403. The intermediate tube 4 has two or more liquid outlet channels 404 inside its wall. The liquid outlet channels 404 are distributed on both sides or around the second liquid inlet channel 405. Each liquid outlet channel 404 is a hollow tubular cavity inside the wall of the intermediate tube 4. One end of the liquid outlet channel 404 is closed, and the opening at the other end is located at the bottom of the intermediate tube 4, at the interface with the connecting seat 503. The upper sidewall of the intermediate tube 4 has a first outlet branch 401 that communicates with the second inlet channel 405 and extends to the outside of the tube wall. The first outlet branch 401 is one or more thin tubular cavities penetrating the upper wall of the intermediate tube 4, appearing as multiple openings on the intermediate tube 4. One end of the first outlet branch 401 communicates with the second inlet channel 405, and the other end extends to the outside of the tube wall of the intermediate tube 4, thus achieving communication between the second inlet channel 405 and the outside of the tube wall of the intermediate tube 4. The middle sidewall of the intermediate tube 4 has a second outlet branch 402 that extends from the outside to the inside and communicates with the outlet channel 404. The outlet of the outlet channel 404 is located at the bottom of the intermediate tube 4. The top of the intermediate tube 4 is closed, which can be achieved by integrally forming a top cover and the intermediate tube, or by other means, such as blocking the top of the intermediate tube with a fixed plug. The outer periphery of the intermediate tube 4 is fitted with a back pressure rubber sleeve 2. Under the action of the back pressure rubber sleeve 2, the high-pressure gas-liquid mixture flows out through the first liquid outlet branch 401 and into the gap between the back pressure rubber sleeve 2 and the intermediate tube 4, and then flows into the liquid outlet channel 404 through the second liquid outlet branch 402.

[0030] In this way, the high-pressure gas-liquid mixture flows sequentially through the inlet port 501, the first inlet channel 403, the second inlet channel 405, the first outlet branch 401, the gap between the back pressure sleeve 2 and the intermediate tube 4, the second outlet branch 402, and the outlet channel 404.

[0031] One end of the intermediate tube 4 is disposed inside the connecting seat 503, the upper cover 1 is sleeved on the outer periphery of the intermediate tube 4, and the bottom of the upper cover 1 is fastened to the base 5.

[0032] The seat-type back pressure valve provided in the application embodiment has a back pressure diaphragm that is resistant to high temperature and high pressure, and has a small overall size, which can meet the needs of the fluid chemistry field. Through the tight fastening of the base and the upper pressure cover, it can meet the high pressure resistance requirements of the fluid chemistry field. Through the precise cooperation of the base, the upper pressure cover and the back pressure diaphragm, it can meet the sealing requirements under high pressure conditions. At the same time, through the structural design of the intermediate tube and the cooperation between the intermediate tube and the back pressure rubber sleeve, it can effectively filter out powdery solids in the gas-liquid mixture while ensuring control accuracy.

[0033] Specifically, since the back pressure sleeve is under back pressure, the gap between the back pressure sleeve and the intermediate tube is very small, allowing the gas-liquid mixture to pass through. However, the powdery solids in the gas-liquid mixture will remain between the back pressure sleeve and the intermediate tube, thus achieving the filtration of the powdery solids.

[0034] In addition, in some embodiments, the back pressure diaphragm is made of one of FFKM, PFA, PTFE, FMA or stainless steel, which has excellent high temperature resistance, high pressure resistance and impact resistance.

[0035] As an optional embodiment of this application, the top of the intermediate tube is closed by a locking screw 301. Specifically, the upper inner surface of the intermediate tube can be threaded, and the top of the intermediate tube is closed by the engagement of the locking screw 301 with the thread. This facilitates the manufacturing of the intermediate tube, reduces manufacturing costs, and also facilitates disassembly and cleaning. In order to reduce the overall size of the device, i.e., reduce the height of the intermediate tube of the back pressure valve, and thus reduce the overall height of the back pressure valve, the threaded rod 302 of the locking screw 301 can extend into the interior of the intermediate tube. To prevent the threaded rod 302 from blocking the first liquid outlet channel 401, a first groove (not shown in the figure) is provided axially on the threaded rod 302 of the locking screw 301 at the position corresponding to the first liquid outlet channel 401. Correspondingly, the thread on the intermediate tube can also be provided with a corresponding groove 404. It is easy to see that having a groove on either the threaded rod 302 or the thread on the intermediate tube can prevent the blockage of the first liquid outlet channel 401.

[0036] In some embodiments, in order to fix the back pressure sleeve and prevent it from falling off the intermediate tube under the impact of the high-pressure gas-liquid mixture, a first annular protrusion is provided on the outer periphery of the connector. The back pressure sleeve fitted on the first annular protrusion will undergo elastic deformation, which on the one hand achieves a sealing function, and on the other hand can better fix the back pressure sleeve.

[0037] To further secure the back pressure sleeve, a second annular protrusion is provided on the inner wall of the top cover at a position corresponding to the first annular protrusion. The back pressure sleeve is secured by the pressing action of the first and second annular protrusions.

[0038] To further secure the back pressure sleeve, the position on the back pressure sleeve corresponding to the first annular protrusion is concave. This concave portion of the back pressure sleeve allows it to better engage with the first annular protrusion, thus achieving a secure fit.

[0039] To reduce the overall size of the device, in some embodiments, the intermediate tube is connected to the connecting seat by a thread, and a second groove is formed axially on the thread of the intermediate tube at the connection. Correspondingly, a groove corresponding to the second groove may also be selectively provided on the thread of the connecting seat.

[0040] In some embodiments, the base has a third liquid outlet branch communicating with the liquid outlet port. The inlet of the liquid outlet branch is located on the top surface of the base corresponding to the second groove. The gas-liquid mixture flowing through the second liquid outlet branch converges to the liquid outlet port through the third liquid outlet branch. In this embodiment, the third liquid outlet branch is located inside the base and is not connected to any other pipes or ports besides the liquid outlet port. The shape of the third liquid outlet branch can be configured as needed; for example, it can be a pipe surrounding the first liquid inlet channel 403, which is not specifically limited here.

[0041] To achieve a better sealing effect, in some embodiments, a sealing ring is also included at the connection between the intermediate tube and the connecting seat.

[0042] The seat-type back pressure valve provided in the application embodiment has a back pressure diaphragm that is resistant to high temperature and high pressure, and has a small overall size, which can meet the needs of the fluid chemistry field. Through the tight fastening of the base and the upper pressure cover, it can meet the high pressure resistance requirements of the fluid chemistry field. Through the precise cooperation of the base, the upper pressure cover and the back pressure diaphragm, it can meet the sealing requirements under high pressure conditions. At the same time, through the structural design of the intermediate tube and the cooperation between the intermediate tube and the back pressure rubber sleeve, it can effectively filter out powdery solids in the gas-liquid mixture while ensuring control accuracy.

[0043] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A seated back pressure valve characterized by, include: Top cover, middle tube, and base; The top cover has an inner cavity, and a back pressure air interface is provided on the top of the top cover, which is connected to the inner cavity; the base has a first liquid inlet channel inside, and a liquid inlet interface and a liquid outlet interface are respectively provided on the side of the base, which are connected to the first liquid inlet channel; a connecting seat is provided on the top of the base, and the bottom of the connecting seat is open, which is connected to the first liquid inlet channel; the middle tube has a second liquid inlet channel inside, and a liquid outlet channel is provided inside the tube wall of the middle tube; a first liquid outlet branch is opened on the upper side wall of the middle tube, which is connected to the second liquid inlet channel and extends to the outside of the tube wall; a second liquid outlet branch is opened from the outside to the inside on the middle side wall of the middle tube, which extends to the liquid outlet channel and is connected to the liquid outlet channel; the outlet of the liquid outlet channel is located at the bottom of the middle tube; the top of the middle tube is closed, and a back pressure rubber sleeve is fitted on the outer periphery of the middle tube; One end of the intermediate tube is disposed inside the connecting seat, the upper cover is sleeved on the outer periphery of the intermediate tube, and the bottom of the upper cover is fastened to the base.

2. The seated pressure relief valve of claim 1, wherein The back pressure diaphragm is made of one of the following materials: FFKM, PFA, PTFE, FMA, or stainless steel.

3. The seated pressure relief valve of claim 1, wherein The top of the intermediate tube is closed by a locking screw.

4. The seated pressure relief valve of claim 3, wherein, The locking screw has a first groove axially provided on its threaded shaft at the position corresponding to the first liquid outlet channel.

5. The seated pressure relief valve of claim 1, wherein The outer periphery of the connector is provided with a first annular protrusion.

6. The seat-type back pressure valve according to claim 5, characterized in that, A second annular protrusion is provided on the inner side wall of the top cover at the position corresponding to the annular protrusion.

7. The seat-type back pressure valve according to claim 6, characterized in that, The back pressure sleeve has an inward concave shape corresponding to the first annular protrusion at the position.

8. The seat-type back pressure valve according to claim 1, characterized in that, The intermediate tube is connected to the connecting seat by a thread, and a second groove is provided axially on the thread of the intermediate tube at the connection.

9. The seat-type back pressure valve according to claim 8, characterized in that, The base has a third liquid outlet channel that communicates with the liquid outlet interface. The inlet of the liquid outlet channel is located on the top surface of the base at the position corresponding to the second groove.

10. The seated back pressure valve according to claim 1, characterized in that, It also includes a sealing ring disposed at the connection between the intermediate tube and the connecting seat.

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