A vertical gate valve

Abstract

This invention relates to the field of gate valves, and provides a vertical gate valve including a valve body with a valve cavity inside. A valve stem is located within the valve cavity. The valve body has a maintenance port flow channel, which is laterally arranged beside the valve stem and communicates with the valve cavity. A detachable flow-stabilizing and pressure-tapping sleeve is provided within the maintenance port flow channel. Along the flow direction of the recovered refrigerant from the valve cavity to the outside of the maintenance port flow channel, the flow-stabilizing and pressure-tapping sleeve is sequentially formed from the inlet end to the outlet end with a flow-collecting and stabilizing cavity, a swirl treatment cavity, and a ring-shaped pressure-stabilizing cavity. An annular folding flow-stopping element is integrally formed inside the annular folding flow-stopping element, with a main flow through-hole penetrating through its center. In use, this invention solves the problems of unstable refrigerant recovery flow and fluctuating pressure readings by setting a flow-stabilizing and pressure-tapping sleeve with a closed-loop pressure measuring cavity within the maintenance port flow channel.

Description

Technical Field

[0001] This invention relates to the field of gate valves, and more specifically, to a vertical gate valve. Background Technology

[0002] Vertical shut-off valves are key control components in refrigeration systems, directly installed on the compressor's suction and discharge ports. Essentially, they are multi-functional, multi-way manual valves that serve as the "throat" connecting the compressor to the entire refrigeration system piping. Their core function is to isolate the compressor from the system, enabling operations such as vacuuming, refrigerant charging, and maintenance.

[0003] The existing vertical gate valve has a service port with a straight orifice of equal diameter. The connection between the valve cavity and the service port is a right-angle abrupt change in cross-section. The service port is used for refrigerant recovery at the lower sealing position of the valve stem, and for charging refrigerant into the system and connecting a pressure gauge for pressure testing at the middle inspection position of the valve stem.

[0004] In refrigerant recovery mode, with the valve stem in the lower sealing position, the flow cross-section contracts sharply when the refrigerant enters the service port from the valve chamber on the system side. This causes a sudden change in the flow direction, which easily generates local eddies and significant local resistance losses, resulting in unstable recovery flow and poor discharge. This is especially noticeable in high-flow-rate or two-phase gas-liquid recovery, affecting the determination of the recovery endpoint and prolonging the recovery time. In pressure detection mode, with the valve stem in the intermediate maintenance position and the service port connected to the pressure gauge, the service port has a simple flow channel structure and small diameter. Furthermore, the abrupt right-angle change between the valve chamber and the service port lacks effective buffering and damping for pressure pulsations. Periodic pressure pulsations from the compressor are easily transmitted to the pressure gauge through the service port, causing significant fluctuations in the pressure gauge reading and hindering the rapid and accurate reading of pressure values.

[0005] Therefore, this application proposes a vertical stop valve to solve the above problems. Summary of the Invention

[0006] Technical problem to be solved: In view of the problems existing in the prior art, the purpose of this invention is to provide a vertical shut-off valve to solve the problems of local eddies, unstable flow, and poor discharge of refrigerant during refrigerant recovery caused by the abrupt right-angle change at the connection between the valve cavity and the service port flow channel, as well as insufficient pulsation damping and pressure gauge reading fluctuations during pressure detection.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a vertical shut-off valve, comprising a valve body, a valve cavity inside the valve body, a valve stem inside the valve cavity, a maintenance port flow channel in the valve body, the maintenance port flow channel being laterally arranged beside the valve stem and communicating with the valve cavity, and a detachable flow stabilizing and pressure tapping sleeve inside the maintenance port flow channel; along the flow direction of the recovered refrigerant discharged from the valve cavity to the outside of the maintenance port flow channel, the flow stabilizing and pressure tapping sleeve is sequentially formed from the inlet end to the outlet end with a flow collecting and stabilizing cavity, a vortex... The device includes a flow processing chamber and a ring-shaped pressure regulating chamber. The ring-shaped pressure regulating chamber has an integrally formed ring-shaped flow-blocking component. A main flow through-hole is formed through the center of the ring-shaped flow-blocking component, and damping micro-holes are evenly distributed in a ring on the upper surface of the ring-shaped flow-blocking component. The main flow through-hole is located in the middle of the pressure regulating sleeve, forming a main medium flow channel. The outer side of the ring-shaped flow-blocking component and the inner wall of the pressure regulating sleeve enclose a closed-loop pressure measuring chamber. A lateral pressure guide tube is horizontally fixed through the side wall of the pressure regulating sleeve, and the inner end of the lateral pressure guide tube is connected to the pressure measuring chamber.

[0008] Furthermore, the flow collection and stabilization cavity includes an annular converging opening integrally formed at the inlet end of the flow stabilization and pressure tapping sleeve. The annular converging opening has a flared structure that gradually narrows from bottom to top. Multiple axial flow guide ribs are evenly arranged circumferentially on the inner side of the annular converging opening. The axial flow guide ribs are set in close contact with the inner wall of the flared opening and have the same curvature as the inner wall of the flared opening.

[0009] Furthermore, the swirl processing cavity includes an equal-thickness annular opening integrally formed inside the stabilizing pressure tapping sleeve, the axial thickness of the equal-thickness annular opening being consistent with the thickness of the top of the annular converging opening; the inner wall of the equal-thickness annular opening is continuously provided with micro-spiral streamline grooves, and the top of the equal-thickness annular opening is provided with an outer inclined annular surface.

[0010] Furthermore, the annular pressure stabilizing cavity is formed by expanding the inner wall of the upper end of the pressure tapping sleeve. The radial inner diameter of the annular pressure stabilizing cavity is larger than the radial inner diameter of the flow channel of the vortex treatment cavity, forming a stepped expansion chamber structure.

[0011] Furthermore, the outer inclined annular surface at the top of the equal-thickness annular opening is positioned directly opposite the lower part of the annular folding flow cutter, and the radial projection width of the outer inclined annular surface is adapted to the radial width of the lower end plane of the annular folding flow cutter.

[0012] Furthermore, the annular folding flow cutter has an inverted L-shaped cross-section structure, and an inner inclined annular surface is formed at the upper end of the annular folding flow cutter. A plurality of damping micro-holes are distributed in a ring array along the inner inclined annular surface.

[0013] Furthermore, a positioning stepped groove is provided on the lower outer side of the stabilizing pressure tapping sleeve, and a matching stepped platform is provided on the inner wall of the maintenance port flow channel. The positioning stepped groove and the matching stepped platform are limited and fitted to achieve axial positioning. A sealing ring groove is provided on the lower outer periphery of the stabilizing pressure tapping sleeve, and a sealing rubber ring is installed inside the sealing ring groove.

[0014] Furthermore, the flow-stabilizing pressure tapping sleeve is made of brass, and an outer threaded sleeve is integrally formed on the outer wall of the middle part of the flow-stabilizing pressure tapping sleeve. The outer threaded sleeve is matched and connected to the external thread at the upper end of the service port flow channel.

[0015] Furthermore, a horizontal head nut is installed on the top of the current stabilizing pressure tapping sleeve, and a copper sealing cap is provided inside the horizontal head nut.

[0016] Beneficial effects: Compared with the prior art, the advantages of the present invention are: 1. The present application improves the problem of unstable flow and pressure detection reading fluctuation when the refrigerant is recovered by setting a detachable multi-stage stabilizing pressure tapping sleeve in the maintenance port flow channel of the valve body to replace the original straight flow channel with right-angle sudden change.

[0017] 2. By dividing the stabilizing pressure tapping sleeve into a flow collection and stabilizing chamber, a swirling flow treatment chamber, and an annular pressure stabilizing chamber, the three chambers form a continuous transition flow channel. The refrigerant is guided and dispersed in two phases by means of an annular converging opening, axial guide ribs, and micro spiral streamline grooves, reducing inlet eddies, lowering local flow resistance, and making the refrigerant recovery process flow more smoothly.

[0018] 3. A closed-loop pressure measuring chamber is formed by enclosing the flow-blocking component. The circumferentially evenly arranged damping micropores connect the pressure measuring chamber and the central main channel. The medium entering the pressure measuring chamber can stay in the chamber for a short time. The volume of the chamber buffers the pressure pulsation. The micropores make the pressure in the chamber circumferentially balanced, reduce the fluctuation of the pressure detection reading, and improve the stability of pressure acquisition.

[0019] 4. The flow stabilizing and pressure tapping sleeve adopts a double limiting structure of stepped positioning and threaded locking, and is equipped with radial sealing, which ensures reliable sealing. The sleeve is completely detachable, and the valve body can be disassembled and replaced without modification, retaining all the original valve's operating functions and making future maintenance convenient. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0021] Figure 2 This is a top view of the present invention.

[0022] Figure 3 This is a schematic diagram of the valve stem in the upper sealing position within the valve body according to the present invention.

[0023] Figure 4 This is a schematic diagram of the valve stem of the present invention in the lower sealing position within the valve body.

[0024] Figure 5 This is a schematic diagram of the valve stem of the present invention in the middle position within the valve body.

[0025] Figure 6 For the present invention Figure 5 Enlarged view of point A.

[0026] Figure 7 This is a schematic diagram of the disassembled structure of the maintenance port flow channel, the flow stabilizing pressure tapping sleeve, and the horizontal head nut of the present invention.

[0027] Figure 8 This is a schematic diagram of the structure of the stepped platform in this invention.

[0028] Figure 9 This is a schematic diagram of the internal structure of the current tapping sleeve of the present invention.

[0029] Figure 10 This is a schematic diagram of the flow collection and stabilization cavity structure of the present invention.

[0030] Figure 11 This is a schematic diagram of the annular folding flow-cutting component structure of the present invention.

[0031] Figure 12 This is a schematic diagram showing the flow direction of the recovered refrigerant in the pressure tapping sleeve of the present invention.

[0032] The attached figures are labeled as follows: 1. Valve body; 101. Valve stem; 102. Plug; 103. Gasket; 104. Teflon gasket; 105. Plastic nut;

[0033] 2. Maintenance port flow channel; 21. Matching stepped platform;

[0034] 3. Flow stabilizing and pressure tapping sleeve; 31. Positioning stepped groove; 32. Sealing ring groove; 33. Sealing rubber ring; 34. Outer threaded sleeve;

[0035] 4. Flow collection and stabilizing cavity; 41. Annular converging opening; 42. Axial guide ribs;

[0036] 5. Swirl treatment chamber; 51. Uniform thickness annular opening; 52. Miniature spiral streamline groove; 53. Outer inclined annular surface;

[0037] 6. Circular pressure regulating chamber; 61. Circular folding flow cut-off element; 62. Main flow through hole; 63. Damping micro-orifice; 64. Pressure measuring chamber; 65. Lateral pressure guide tube; 66. Inner inclined annular surface;

[0038] 7. Horizontal head nut; 8. Copper sealing cap. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0040] This application provides a vertical shut-off valve that solves the problems of local eddies, unstable flow, and poor discharge during refrigerant recovery caused by the abrupt right-angle change at the connection between the valve cavity and the service port flow channel in existing vertical shut-off valves, as well as insufficient pulsation damping and pressure gauge reading fluctuations during pressure detection. In use, by setting a flow-stabilizing pressure tapping sleeve with a closed-loop pressure measuring chamber in the service port flow channel, the problems of unstable refrigerant recovery flow and pressure detection reading fluctuations are solved.

[0041] The technical solutions in this application are intended to solve the above-mentioned technical problems, and the overall approach is as follows.

[0042] Example 1, please refer to Figures 1-12 As shown, a vertical shut-off valve includes a valve body 1, a valve cavity inside the valve body 1, a valve stem 101 inside the valve cavity, a maintenance port flow channel 2 on the valve body 1, the maintenance port flow channel 2 being laterally arranged beside the valve stem 101 and communicating with the valve cavity, and a detachable flow stabilizing and pressure tapping sleeve 3 inside the maintenance port flow channel 2; along the flow direction of the recovered refrigerant from the valve cavity to the outside of the maintenance port flow channel 2, the flow stabilizing and pressure tapping sleeve 3 is sequentially formed from the inlet end to the outlet end with a flow collecting and stabilizing cavity 4, a swirl treatment cavity 5, and an annular pressure stabilizing cavity 6; The annular pressure regulating chamber 6 has an integrally formed annular folding flow-blocking component 61. The annular folding flow-blocking component 61 has a main flow through hole 62 through its center. The upper end face of the annular folding flow-blocking component 61 has damping micro-holes 63 evenly distributed in a ring. The main flow through hole 62 is located in the middle of the flow-regulating pressure tapping sleeve 3 to form the main medium flow channel. The outer side of the annular folding flow-blocking component 61 and the inner wall of the flow-regulating pressure tapping sleeve 3 form a closed-loop pressure measuring chamber 64. A lateral pressure guide tube 65 is fixedly fixed through the side wall of the flow-regulating pressure tapping sleeve 3. The inner end of the lateral pressure guide tube 65 is connected to the pressure measuring chamber 64.

[0043] Furthermore, a horizontal head nut 7 is installed on the top of the pressure tapping sleeve 3, and a copper sealing cap 8 is provided inside the horizontal head nut 7.

[0044] Specifically, a detachable flow-stabilizing and pressure-tapping sleeve 3 is installed in the maintenance port flow channel 2 connected to the side of the valve body 1. After the refrigerant flows out of the valve cavity, it passes through the flow-stabilizing chamber 4, the swirling treatment chamber 5, and the annular pressure-stabilizing chamber 6 in sequence. The multi-stage chamber can sort out the disordered refrigerant flow and weaken the pressure pulsation generated by the recovered medium. After the refrigerant reaches the position of the annular folding and cutting element 61, most of the medium flows upward through the main flow through hole 62, and a small part of the medium enters the closed-loop pressure measuring chamber 64 through the damping micro-holes 63. The damping micro-holes 63, which are evenly distributed along the circumference, can balance the internal pressure of the closed-loop pressure measuring chamber 64 and form a stable and uniform pressure field in the chamber. The lateral pressure guide tube 65 can thus collect a more accurate refrigerant pressure signal.

[0045] Furthermore, the pressure tapping sleeve 3 is detachable, making it easy to inspect and replace; the horizontal nut 7 at the top of the sleeve and the copper sealing cap 8 work together to achieve effective sealing of the upper outlet of the sleeve and prevent refrigerant leakage.

[0046] The valve body 1 serves as the load-bearing foundation of this vertical gate valve and is forged from high-strength brass alloy. The valve stem 101, as the actuator, transmits torque and is the key transmission component for opening and closing the valve. Rotating the valve stem 101 converts the manual mechanical torque into axial driving force, providing the original power for the valve core displacement. It is the starting point of the entire switching mechanism. The change in the position of the valve stem 101 directly determines the connection or cut-off of the airflow channel, thereby distributing the refrigerant flow to the compressor, external pipeline, or maintenance port 2.

[0047] Secondly, the valve body 1 of the vertical stop valve is provided with a compressor interface, a system pipeline interface, a valve interface, and a maintenance port flow channel 2; a plug 102 is installed inside the valve interface, and a gasket 103, a Teflon sealing gasket 104, a Teflon sealing gasket 104, and a gasket 103 are stacked sequentially at the sealing mating position between the plug 102 and the valve interface; a valve stem 101 passes through the middle of the plug 102; a plastic nut 105 is installed on the outside of the valve interface.

[0048] Among them, the Teflon sealing gasket 104 serves as a sealing packing ring to achieve dynamic sealing at the valve stem 101, eliminating the risk of external leakage; it integrates a standard interface, which can monitor the valve chamber pressure in real time, providing data support for the safe operation of the system;

[0049] Meanwhile, the operating conditions of the valve stem 101 at different positions within the valve body 1 are as follows:

[0050] refer to Figure 3 When valve stem 101 is in the upper sealing position inside valve body 1: when valve stem 101 is rotated counterclockwise to the end, the compressor and pipeline are unobstructed, and the maintenance port flow channel 2 is closed; this is suitable for normal equipment operation and ensures free flow of refrigerant.

[0051] refer to Figure 4 The valve stem 101 is in the lower sealing position inside the valve body 1: when the valve stem 101 is rotated clockwise to the bottom, it cuts off the passage between the compressor and the pipeline, and only the maintenance port flow channel 2 is connected to the compressor; it is mainly used to isolate the compressor and perform refrigerant recovery operations.

[0052] refer to Figure 5 The valve stem 101 is in the middle position inside the valve body 1: the valve stem 101 is rotated clockwise from the full upper sealing position to about the middle position, and all three are connected; this is the most commonly used maintenance position, used for pressure detection, vacuuming and refrigerant charging.

[0053] Specifically, the operating procedure of this vertical shut-off valve for the refrigerant piping system is as follows:

[0054] Overview: This vertical shut-off valve is mainly used in refrigerant recovery and detection pipeline systems. The valve body 1 has a valve cavity inside, and the valve stem 101 can switch between different working positions. The valve body 1 has a maintenance port flow channel 2 on the side, which is connected to the valve cavity. The flow stabilizing and pressure tapping sleeve 3 is detachably assembled inside the maintenance port flow channel 2.

[0055] First, during assembly, remove the horizontal head nut 7 from the service port flow channel 2, and insert the flow stabilizing pressure tapping sleeve 3 from the outside of the service port flow channel 2. The positioning stepped groove 31 on the lower part of the outer side of the flow stabilizing pressure tapping sleeve 3 and the mating stepped platform 21 on the inner wall of the service port flow channel 2 mutually limit and fit each other, completing the axial positioning of the sleeve. The sealing ring groove 32 on the lower outer periphery of the flow stabilizing pressure tapping sleeve 3 is fitted with a sealing rubber ring 33 to achieve radial sealing of the lower part of the flow stabilizing pressure tapping sleeve 3. The outer threaded sleeve 34 integrally formed on the outer wall of the middle part of the flow stabilizing pressure tapping sleeve 3 is matched and connected with the external thread at the upper end of the service port flow channel 2 to achieve overall locking and fixing of the sleeve. Then, the previously removed horizontal head nut 7 is fitted on the top of the flow stabilizing pressure tapping sleeve 3. A copper sealing cap 8 is set inside the horizontal head nut 7 to achieve sealing and protection of the top of the flow stabilizing pressure tapping sleeve 3.

[0056] It should be noted that after the maintenance port flow channel 2 is inserted into the pressure tapping sleeve 3, the original cavity of the maintenance port flow channel 2 is occupied by the body of the pressure tapping sleeve 3, and the effective flow cross section is limited by the internal flow channel of the pressure tapping sleeve 3. The flow channel matching design of each chamber inside the pressure tapping sleeve 3 will not cause a decrease in the overall flow capacity. On the contrary, the regular flow channel will eliminate the local eddies caused by the right angle change and reduce the local resistance loss.

[0057] Second, this type of shut-off valve has two typical operating conditions: refrigerant recovery condition and pressure detection condition;

[0058] Mode 1, refrigerant recovery condition: Valve stem 101 is in the lower sealing position, and the refrigerant on the system side is discharged from the valve cavity of valve body 1 to the outside of the maintenance port flow channel 2; when the flow stabilizing pressure tapping sleeve 3 is not installed, the medium (refrigerant medium, i.e. gas-liquid two-phase refrigerant) will experience a sharp contraction of the flow cross section and a sudden change of right angle when entering the maintenance port from the valve cavity, which is very easy to generate local eddies and large local resistance loss, resulting in unstable recovery flow and poor medium discharge. This problem is particularly prominent under the condition of large flow and coexistence of gas and liquid phases, which interferes with the judgment of the recovery endpoint and prolongs the recovery operation time;

[0059] In this scheme, after the medium flows out of the valve cavity, it directly enters the inside of the stabilizing pressure tapping sleeve 3 and flows sequentially through the flow collection and stabilizing cavity 4, the swirling treatment cavity 5, and the annular pressure stabilizing cavity 6, avoiding the unfavorable flow caused by the right-angle sudden change in the original maintenance port flow channel.

[0060] First, the medium enters the flow collection and stabilization chamber 4: The flow collection and stabilization chamber 4 is an annular converging opening 41 integrally formed at the inlet end of the flow stabilization and pressure tapping sleeve 3. The annular converging opening 41 has a bell-shaped structure that gradually narrows from bottom to top. Multiple axial flow guide ribs 42 are arranged circumferentially on the inner side of the annular converging opening 41. The axial flow guide ribs 42 fit the inner wall of the bell-shaped opening and are consistent with the curvature of the inner wall. The turbulent gas-liquid two-phase refrigerant flowing in from the side of the valve cavity is gathered and guided by the annular converging opening 41 and the axial flow guide ribs 42, which initially regulates the incoming flow, weakens the local eddies at the inlet, improves the inlet flow conditions, and reduces local resistance.

[0061] Next, the regulated medium flows upward into the swirl treatment chamber 5; the swirl treatment chamber 5 is provided with an integrally formed equal-thickness annular opening 51. The axial thickness of the equal-thickness annular opening 51 is the same as the top thickness of the annular converging opening 41, so that the flow channel cross section transitions smoothly at the junction without abrupt expansion or contraction, avoiding additional turbulence caused by sudden changes in cross section.

[0062] The inner wall of the uniform thickness annular opening 51 is provided with continuous micro-spiral streamline grooves 52. When the medium flows through the micro-spiral streamline grooves 52, the medium in the near-wall region is subjected to tangential disturbance by the geometric constraint of the spiral groove wall, while the central mainstream region maintains axial flow. This near-wall tangential disturbance has a shearing and tearing effect on the continuous liquid film attached to the wall, destroying the integrity of the liquid film and dispersing the large volume liquid clumps gathered at the wall into fine droplets. When the droplets dispersed by the wall are transported upward with the central airflow, their distribution uniformity is significantly improved, thereby avoiding the large volume liquid clumps from directly impacting the downstream annular folding flow cut-off member 61 in a concentrated form. At the same time, it also weakens the violent disturbance caused by the liquid phase being carried by the high-speed airflow, making the phase distribution of the downstream flow field tend to be uniform.

[0063] Furthermore, the top of the equal thickness annular opening 51 is provided with an outer inclined annular surface 53, which is directly opposite the lower side of the annular folding flow cutter 61, and the inclination angle of the outer inclined annular surface 53 is adapted to the inclination angle of the lower end face of the annular folding flow cutter 61; the medium after disturbance and combing is obliquely fed into the annular folding pressure stabilizing cavity 6 under the guidance of the outer inclined annular surface 53.

[0064] Subsequently, since the annular pressure stabilizing chamber 6 is formed by expanding the inner wall of the upper end of the flow stabilizing pressure tapping sleeve 3, the radial inner diameter of the annular pressure stabilizing chamber 6 is larger than the inner diameter of the flow channel of the swirl treatment chamber 5, forming a stepped expansion chamber; after the above-mentioned medium enters the annular pressure stabilizing chamber 6, it expands and releases pressure, further dissipates the flow kinetic energy, suppresses refrigerant pressure pulsation, and at the same time provides a short-term buffer space for the gas and liquid phases, reducing the violent disturbance of the two-phase medium;

[0065] Mode 2, pressure detection condition: Valve stem 101 is in the middle maintenance position, and the pressure gauge is connected to the external pressure gauge through the maintenance port flow channel 2. When the flow stabilizing and pressure tapping sleeve 3 is not installed, there is a sudden right angle change between the valve cavity and the maintenance port flow channel 2. Without buffering and damping, the periodic pressure pulsation of the compressor will be directly transmitted to the pressure gauge, causing the reading to fluctuate.

[0066] In this design, an inverted L-shaped cross-section annular folding flow-blocking component 61 is integrally formed inside the annular folding flow-blocking chamber 6; a through main flow hole 62 is opened in the center of the annular folding flow-blocking component 61, which constitutes the main flow channel for refrigerant recovery; under refrigerant recovery conditions, most of the refrigerant directly passes through the main flow hole 62 and is discharged outward, ensuring the flow capacity of the recovery operation; an inner inclined annular surface 66 is formed at the upper end of the annular folding flow-blocking component 61, and several damping micro-holes 63 are distributed in a ring array on the inner inclined annular surface 66; a closed-loop pressure measuring chamber 64 is formed between the outer wall of the annular folding flow-blocking component 61 and the upper inner wall of the flow-stabilizing pressure tapping sleeve 3;

[0067] After the medium is collected and regulated by the flow collection and stabilization cavity 4, stirred and combed by the swirling treatment cavity 5, and expanded and stabilized by the annular choke pressure stabilization cavity 6, under the guidance of the outer inclined annular surface 53 at the top of the swirling treatment cavity 5, the external part of the medium flows into the closed-loop pressure measuring cavity 64 along the outer wall of the annular folding flow cut-off component 61, and smoothly enters the closed-loop pressure measuring cavity 64, so that a relatively stable outer pressure field is formed in the circumference of the pressure measuring cavity 64.

[0068] The medium entering the closed-loop pressure measuring chamber 64 can flow back to the central main flow channel through the damping micro-holes 63 opened on the inner inclined annular surface 66 and be discharged along the top opening of the stabilizing pressure tapping sleeve 3. Since the flow cross-section of the damping micro-holes 63 is small, it plays a throttling and blocking role, slowing down the rate of outward flow of the medium inside the pressure measuring chamber 64, prolonging the residence time of the medium in the closed-loop pressure measuring chamber 64, allowing the pressure inside the chamber to fully diffuse and equalize, and further weakening the pressure fluctuations caused by the gas-liquid two-phase refrigerant impact disturbance and the periodic pulsation of the compressor.

[0069] Under pressure detection conditions, the lateral pressure guide tube 65, which is fixed horizontally through the side wall of the stabilizing pressure tapping sleeve 3, is connected to the closed-loop pressure measuring chamber 64. The lateral pressure guide tube 65 collects the balanced and stable pressure signal in the pressure measuring chamber 64 and transmits it to the pressure detection element. The pressure signal has small fluctuations and stable output, which makes it easy for the system to quickly and accurately obtain the pressure value of the refrigerant in the valve.

[0070] Third, when it is necessary to inspect or replace the internal flow channel components, remove the top horizontal head nut 7, loosen the outer threaded sleeve 34, and the entire flow stabilizing and pressure tapping sleeve 3 can be pulled out from the maintenance port flow channel 2 as a whole. The sealing rubber ring 33, the positioning step groove 31 and the mating step platform 21 are disengaged, and the overall disassembly and maintenance are completed.

[0071] Please see Figure 9 and Figure 10 As shown, the flow collection and stabilization cavity 4 includes an annular converging opening 41 integrally formed at the inlet end of the flow stabilization and pressure tapping sleeve 3. The annular converging opening 41 has a flared mouth structure that gradually narrows from bottom to top. Multiple axial flow guide ribs 42 are evenly arranged circumferentially on the inner side of the annular converging opening 41. The axial flow guide ribs 42 are set to fit against the inner wall of the flared mouth and have the same curvature as the inner wall of the flared mouth.

[0072] Specifically, the flow collection and stabilization cavity 4 is integrally formed and set at the medium inlet end of the flow stabilization and pressure tapping sleeve 3. As the first-level flow guiding structure of the entire sleeve flow channel, the annular converging opening 41 has a horn structure that gradually narrows from bottom to top, so that the refrigerant medium flowing out of the valve cavity can smoothly transition into the internal flow channel of the flow stabilization and pressure tapping sleeve 3, and avoid sudden changes in the flow cross section when the medium enters the flow stabilization and pressure tapping sleeve 3.

[0073] Meanwhile, multiple axially arranged guide ribs 42, evenly distributed along the circumference, divide the near-wall region of the annular converging port 41 into multiple fan-shaped sub-channels distributed in an annular array. The central region of the annular converging port 41 remains unobstructed, with part of the medium being directly transported upward from the central region, while the other part of the near-wall medium is constrained by the guide ribs and flows axially upward along each fan-shaped sub-channel. The two fluids enter the swirling treatment chamber 5 together. This structure can guide the refrigerant flow direction, enabling the near-wall fluid to obtain an effective axial velocity component, weakening the local eddies in the inlet transition region, and reducing local flow resistance.

[0074] Please see Figure 9 As shown, the swirl processing chamber 5 includes an equal-thickness annular opening 51 integrally formed inside the stabilizing pressure tapping sleeve 3. The axial thickness of the equal-thickness annular opening 51 is consistent with the thickness of the top of the annular converging opening 41. The inner wall of the equal-thickness annular opening 51 is continuously provided with micro spiral streamline grooves 52, and the top of the equal-thickness annular opening 51 is provided with an outer inclined annular surface 53.

[0075] Specifically, the equal-thickness annular opening 51 and the annular converging opening 41 adopt the same axial thickness, so that the connecting end faces of the two flow channels are flush and transitioned, eliminating the uneven steps at the connection and avoiding additional flow disturbances caused by abrupt changes in the flow channel cross-section; the micro spiral streamline groove 52 is continuously arranged around the inner wall of the equal-thickness annular opening 51, and the groove is opened at a small depth, so it will not occupy the flow area of ​​the central mainstream channel; when the medium flows through this position, only the fluid near the pipe wall is constrained by the spiral groove and generates tangential disturbance, while the refrigerant medium at the center of the flow channel still maintains axial upward flow. The outer inclined annular surface 53 extends outward from the upper end of the equal-thickness annular opening 51, and after the fluid is guided by the slope, part of it flows to the lower part of the annular folding flow cut-off part 61, thus providing a basis for the pressure tapping flow field of the subsequent pressure measuring chamber 64.

[0076] Please see Figure 9 and Figure 12 As shown, the annular pressure stabilizing cavity 6 is formed by expanding the inner wall of the upper end of the pressure tapping sleeve 3. The radial inner diameter of the annular pressure stabilizing cavity 6 is larger than the radial inner diameter of the flow channel of the vortex treatment cavity 5, forming a stepped expansion chamber structure.

[0077] Specifically, after the diameter is expanded, a radially expanding annular space is formed on the inner side of the inner wall of the pressure tapping sleeve 3 to accommodate the downstream annular folding flow cut-off component 61; the upper outlet of the swirl treatment chamber 5 is connected to the expansion section of the annular folding pressure stabilizing chamber 6, and together with the outer inclined annular surface 53 at the top, a circumferential fluid channel is formed around the annular folding flow cut-off component 61.

[0078] This expansion only adjusts the radial dimension of the inner flow channel. The outer diameter of the outer wall of the stabilizing pressure tapping sleeve 3 remains unchanged. The expansion space of the annular pressure stabilizing cavity 6 serves as a transition cavity between the swirling flow treatment cavity 5 and the annular folding flow cut-off component 61, reserving space for the deflection adjustment of the fluid flow direction. At the same time, it provides flow channel layout conditions for a portion of the refrigerant to laterally merge into the closed-loop pressure measuring cavity 64.

[0079] Please see Figure 9 and Figure 12 As shown, the outer inclined annular surface 53 at the top of the equal thickness annular opening 51 is positioned directly opposite the lower part of the annular folding flow cutter 61, and the radial projection width of the outer inclined annular surface 53 is adapted to the radial width of the lower end plane of the annular folding flow cutter 61.

[0080] Specifically, the radial coverage of the outer inclined annular surface 53 corresponds to the lower plane of the annular folding flow cut-off component 61. The refrigerant flowing out from the outer inclined annular surface 53 can act precisely on the lower plane area of ​​the annular folding flow cut-off component 61. Relying on the inclined guidance of the slope, the refrigerant is guided to the outside of the annular folding flow cut-off component 61, so that a part of the refrigerant can be diverted into the closed-loop pressure measuring chamber 64.

[0081] Please see Figure 9 and Figure 11 As shown, the annular folding flow cutter 61 has an inverted L-shaped cross-section structure. The upper end of the annular folding flow cutter 61 forms an inner inclined annular surface 66, and a number of damping micro-holes 63 are distributed in a ring array along the inner inclined annular surface 66.

[0082] Specifically, the inverted L-shaped cross-section annular folding flow cut-off element 61 extends radially inward to form a central through-hole area and extends radially outward to form an annular enclosure sidewall; through the cooperation of this enclosure sidewall with the inner wall of the flow stabilizing pressure tapping sleeve 3, an outer annular cavity is formed.

[0083] The inner inclined annular surface 66 is set on the upper end of the annular folding flow cut-off component 61, forming an inclined mounting base. All damping micro-holes 63 have the same diameter and are arranged at equal angles around the inner inclined annular surface 66. The damping micro-holes 63 penetrate the inner inclined annular surface 66 along the thickness direction, forming multiple circumferentially evenly distributed connecting channels between the central main channel and the closed-loop pressure measuring chamber 64. This also facilitates that the refrigerant injected later will not be trapped at the top of the annular folding flow cut-off component 61.

[0084] Please see Figure 9As shown, a positioning stepped groove 31 is provided on the lower outer side of the flow tapping sleeve 3, and a matching stepped platform 21 is provided on the inner wall of the maintenance port flow channel 2. The positioning stepped groove 31 and the matching stepped platform 21 are limited and fitted to achieve axial positioning; a sealing ring groove 32 is provided on the lower outer periphery of the flow tapping sleeve 3, and a sealing rubber ring 33 is installed inside the sealing ring groove 32.

[0085] Further, please refer to Figure 9 As shown, the flow tapping sleeve 3 is made of brass. The outer wall of the flow tapping sleeve 3 is integrally formed with an outer threaded sleeve 34, which is matched and connected to the external thread at the upper end of the maintenance port flow channel 2.

[0086] Specifically, the positioning stepped groove 31 and the mating stepped platform 21 are matched in outline dimensions. After the stabilizing pressure tapping sleeve 3 is installed, the positioning stepped groove 31 and the mating stepped platform 21 abut against each other, restricting the axial displacement of the stabilizing pressure tapping sleeve 3 along the medium flow direction. The sealing ring groove 32 is opened above the positioning stepped groove 31. The sealing rubber ring 33 is embedded in the sealing ring groove 32 and abuts tightly against the inner wall of the maintenance port flow channel 2, forming a radial sealing surface between the outer wall of the stabilizing pressure tapping sleeve 3 and the inner wall of the maintenance port flow channel 2, preventing refrigerant from leaking outward from the assembly gap between the two.

[0087] Meanwhile, the outer threaded sleeve 34 is connected to the external thread at the upper end of the maintenance port flow channel 2, locking the entire flow stabilizing and pressure tapping sleeve 3 inside the maintenance port flow channel 2. Together with the axial abutment of the positioning stepped groove 31 and the mating stepped platform 21, it forms a double axial limit to prevent the flow stabilizing and pressure tapping sleeve 3 from moving upward under the impact of the medium.

[0088] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vertical stop valve, comprising a valve body (1), wherein a valve cavity is provided inside the valve body (1), a valve stem (101) is provided inside the valve cavity, the valve body (1) is provided with a maintenance port flow channel (2), the maintenance port flow channel (2) is laterally arranged beside the valve stem (101) and communicates with the valve cavity, and a detachable flow-stabilizing pressure tapping sleeve (3) is provided inside the maintenance port flow channel (2); characterized in that: Along the flow direction of the recovered refrigerant from the valve cavity to the outside of the maintenance port flow channel (2), the flow stabilizing and pressure tapping sleeve (3) is formed sequentially from the inlet end to the outlet end with a flow stabilizing cavity (4), a swirling treatment cavity (5) and an annular pressure stabilizing cavity (6). The annular stabilizing chamber (6) has an integrally formed annular folding flow cut-off component (61), and the annular folding flow cut-off component (61) has a main flow through hole (62) through the center, and the annular folding flow cut-off component (61) has damping micro-holes (63) evenly distributed in annular shape on the upper end face. The main through hole (62) is located in the middle of the steady flow pressure tapping sleeve (3) to form the main medium flow channel. The outer side of the ring fold cut-off element (61) and the inner wall of the steady flow pressure tapping sleeve (3) form a closed-loop pressure measuring cavity (64). The side wall of the stabilizing pressure tapping sleeve (3) is fixed with a lateral pressure guide tube (65), and the inner end of the lateral pressure guide tube (65) is connected to the pressure measuring chamber (64).

2. A vertical stop valve as described in claim 1, characterized in that, The flow collection and stabilization cavity (4) includes an annular converging opening (41) integrally formed at the inlet end of the flow stabilization and pressure tapping sleeve (3), and the annular converging opening (41) has a flared structure that gradually narrows from bottom to top. Multiple axial flow guide ribs (42) are evenly arranged on the inner circumference of the annular converging opening (41). The axial flow guide ribs (42) are set in close contact with the inner wall of the horn opening and have the same curvature as the inner wall of the horn opening.

3. A vertical stop valve as described in claim 1, characterized in that, The swirling treatment chamber (5) includes an equal-thickness annular opening (51) integrally formed inside the stabilizing pressure tapping sleeve (3), and the axial thickness of the equal-thickness annular opening (51) is consistent with the top thickness of the annular converging opening (41). The inner wall of the equal-thickness annular opening (51) is continuously provided with micro spiral streamline grooves (52), and the top of the equal-thickness annular opening (51) is provided with an outer inclined annular surface (53).

4. A vertical stop valve as described in claim 1, characterized in that, The annular pressure stabilizing cavity (6) is formed by expanding the inner wall of the upper end of the pressure tapping sleeve (3). The radial inner diameter of the annular pressure stabilizing cavity (6) is larger than the radial inner diameter of the flow channel of the vortex treatment cavity (5), forming a stepped expansion chamber structure.

5. A vertical stop valve as described in claim 3, characterized in that, The outer inclined annular surface (53) at the top of the equal thickness annular opening (51) is positioned directly opposite the lower part of the annular folding flow cutter (61), and the radial projection width of the outer inclined annular surface (53) is adapted to the radial width of the lower end plane of the annular folding flow cutter (61).

6. A vertical stop valve as described in claim 1, characterized in that, The annular folding flow cutter (61) has an inverted L-shaped cross-section structure. The upper end of the annular folding flow cutter (61) forms an inner inclined annular surface (66), and a plurality of damping micro-holes (63) are distributed in a ring array along the inner inclined annular surface (66).

7. A vertical stop valve as described in claim 1, characterized in that, The lower outer side of the pressure tapping sleeve (3) is provided with a positioning stepped groove (31), and the inner wall of the maintenance port flow channel (2) is provided with a corresponding mating stepped platform (21). The positioning stepped groove (31) and the mating stepped platform (21) are limited and fitted to achieve axial positioning. The lower outer periphery of the pressure tapping sleeve (3) is provided with a sealing ring groove (32), and a sealing rubber ring (33) is assembled inside the sealing ring groove (32).

8. A vertical stop valve as described in claim 1, characterized in that, The pressure tapping sleeve (3) is made of brass. The outer wall of the middle part of the pressure tapping sleeve (3) is integrally formed with an outer threaded sleeve (34). The outer threaded sleeve (34) is matched and connected to the upper external thread of the maintenance port flow channel (2).

9. A vertical stop valve as described in claim 1, characterized in that, The top of the pressure tapping sleeve (3) is fitted with a horizontal head nut (7), and a copper sealing cap (8) is provided inside the horizontal head nut (7).

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