Venturi drain valve with bypass

Abstract

The utility model relates to the technical field of flow regulation of drain valves, in particular to a venturi drain valve with a bypass, which comprises a valve body with a hollow inner cavity, a sliding plate type valve core is arranged in the hollow inner cavity, and the sliding plate type valve core comprises a movable disc base, a movable disc, a fixed disc and a gland. The movable disc base, the movable disc, the fixed disc and the gland are sequentially installed on the valve body from inside to outside, and a plurality of first flow channel holes are formed in the movable disc. A plurality of second runner holes are formed in the fixed disc; when the drain valve is closed, the first flow channel hole and the second flow channel hole are in a staggered closed state, and when the drain valve is opened, the first flow channel hole and the second flow channel hole are in an aligned communication state; one first circulation hole is aligned and communicated with the second flow channel hole to form a drainage channel, and a Venturi nozzle is in threaded connection with the interior of the drainage channel; according to the drain valve, the whole valve set does not need to be installed, the function of integrating a plurality of valves is achieved only through a single valve, and the drain valve is small in size, convenient to install and small in heat dissipation loss.

Description

Technical Field

[0001] The utility model relates to the technical field of steam trap flow regulation, in particular to a Venturi steam trap with a bypass. Background Art

[0002] The Venturi nozzle, also known as the critical flow Venturi nozzle, is mainly used for the transmission of flow standards, gas flow measurement and the limitation of the maximum flow of the flow system. It is generally used alone on a certain production equipment.

[0003] Steam traps are important control valves to ensure the normal operation of steam systems (heating equipment or steam pipe networks), condensate recycling, and energy conservation. On the one hand, they can prevent steam leakage and avoid energy waste caused by excessive steam consumption; on the other hand, they can discharge condensate in time to avoid corrosion, water hammer and other phenomena that harm the pipeline.

[0004] Most of the existing steam traps need to be equipped with front and rear stop valves and bypass stop valves during installation, so that when the trap fails to effectively discharge condensate during production, the condensate can be discharged by opening the bypass stop valve. However, the steam trap with this configuration not only has a large initial investment, but also has a large valve group and occupies a lot of space. At the same time, the heat dissipation area is large, and the heat loss is large. Utility Model Content

[0005] In order to solve the technical defects raised in the above-mentioned background technology, the purpose of the utility model is to provide a Venturi steam trap with bypass, which does not need to install the entire valve group, but only uses a single valve to realize the function of multiple valve sets, and has a small size, easy installation and small heat dissipation loss.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A Venturi steam trap with bypass, comprising a valve body with a hollow inner cavity, a slide-type valve core is arranged in the hollow cavity of the valve body, the slide-type valve core comprises a movable disc base, a movable disc, a fixed disc and a gland, the movable disc base, the movable disc, the fixed disc and the gland are sequentially installed on the valve body from inside to outside, a plurality of first flow channel holes are opened on the movable disc; a plurality of second flow channel holes are opened on the fixed disc; when the steam trap is closed, the first flow channel holes and the second flow channel holes are in a staggered closed state, and when the steam trap is opened, the first flow channel holes and the second flow channel holes are in an aligned connected state;

[0008] One of the first flow channel holes is aligned with the second flow channel hole and connected to form a drain channel, and a Venturi nozzle is threadedly connected to the drain channel; so that when the drain valve is closed or opened, the drain channel on the Venturi nozzle is in a normally open drain state.

[0009] Preferably, the valve body comprises a circular ring segment and a sleeve segment, both ends of the circular ring segment are provided with openings connected to the hollow inner cavity, a flange fixing plate is detachably connected to the opening, and the flange fixing plate is connected to the valve body; the sleeve segment is arranged perpendicular to the circular ring segment, and the sleeve segment and the circular ring segment are an integrally formed structure.

[0010] Preferably, the movable disk base is provided with springs on both sides to press the movable disk onto the fixed disk, and one end of the movable disk base is connected to the valve stem through a groove engagement, and moves up and down with the valve stem.

[0011] Preferably, the valve stem is installed in the sleeve section, and a valve stem sealing assembly is connected between the valve stem and the port of the sleeve section; the valve stem extends out of the valve stem sealing assembly and is transmission-connected to a lifting drive actuator assembly, and the lifting drive actuator assembly is used to drive the valve stem to drive the movable disk base to slide up and down.

[0012] Preferably, the valve stem sealing assembly includes a sealing valve cover, a spring compensator and a sealing ring; the sealing valve cover is screwed onto the top end of the sleeve section by threads, and a sealing gasket is sleeved at the connection between the sealing valve cover and the sleeve section; the spring compensator is arranged in the sleeve section, and the spring compensator is sleeved on the outer side surface of the valve stem; a plurality of sealing rings are provided, and the plurality of sealing rings are respectively sleeved on the sealing valve cover and the spring compensator.

[0013] Preferably, the lifting drive actuator assembly includes a lifting rod, a connecting plate and an actuator; the lower part of the lifting rod is connected to the valve stem, the middle part of the lifting rod is connected to the connecting plate through a thread, and the upper part of the lifting rod is transmission-connected to the actuator; the actuator drives the lifting rod and the valve stem to move up and down to open or close the slide-type valve core.

[0014] Preferably, the connecting plate is a U-shaped structure composed of a plurality of plates spliced ​​together, and one end of the connecting plate is fixed to the sleeve section by a round nut.

[0015] Preferably, the actuator is a hand wheel, an electric actuator or a pneumatic actuator.

[0016] Preferably, the fixed disk is pressed onto one of the openings of the valve body by the pressure cover, and a cushion block is connected between the fixed disk and the pressure cover.

[0017] Preferably, the first flow channel hole and the second flow channel hole are both U-shaped structures, and the diameters of the first flow channel hole and the second flow channel hole are the same.

[0018] In summary, the beneficial effects of the utility model are:

[0019] 1. The Venturi trap with bypass of the utility model integrates the functions of draining and bypassing, and utilizes the slide valve and the Venturi nozzle to be arranged in the valve body, so that when the trap is opened, the first flow channel hole on the movable disk is aligned and connected with the second flow channel hole, so that the condensed water is directly discharged quickly through the flow channel of the trap (equivalent to opening the bypass), and when the trap is closed, the first flow channel hole and the second flow channel hole are staggered, and the condensed water cannot be discharged through the normal flow channel hole, while the Venturi nozzle arranged on one side remains in a normally open state. Therefore, even when the trap is closed, the condensed water in the steam-water mixture can be drained through the Venturi nozzle, and its working efficiency will not be affected.

[0020] 2. The Venturi steam trap with bypass of the utility model does not need to install the entire valve group, and only uses a single valve to achieve the function of a plurality of valve groups; at the same time, it has a compact structure, complete functions, reliable working performance, saves production costs, and also has the advantages of easy installation and small heat dissipation loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a Venturi steam trap with bypass according to the utility model;

[0022] Figure 2 It is a cross-sectional view of the Venturi steam trap with bypass of the utility model;

[0023] Figure 3 It is a structural schematic diagram of the slide plate type valve core in the utility model;

[0024] Figure 4 It is a side view of the slide plate type valve core in the utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the slide plate type valve core in the utility model when it is open and working;

[0026] Figure 6 This is a schematic diagram of the structure of the slide plate type valve core in the utility model when it is closed;

[0027] Figure 7 It is a schematic diagram of the structure of the Venturi steam trap with bypass driven by a hand wheel of the utility model;

[0028] Figure 8 The utility model is a schematic structural diagram of a Venturi steam trap with bypass driven by an electric / pneumatic actuator.

[0029] Description of reference numerals in the figures:

[0030] 1. Valve body; 11. Circular ring section; 12. Sleeve section; 13. Flange fixed disk; 2. Moving disk base; 21. Spring; 22. Groove; 3. Moving disk; 31. First flow channel hole; 4. Fixed disk; 41. Second flow channel hole; 5. Gland; 6. Venturi nozzle; 7. Valve stem; 8. Valve stem sealing assembly; 81. Sealing valve cover; 82. Spring compensator; 83. Sealing ring; 84. Sealing gasket; 9. Lifting drive actuator assembly; 91. Lifting rod; 92. Connecting plate; 93. Actuator; 94; Round nut; 10. Spacer. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.

[0032] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0033] In the description of the utility model, if there is a word description such as "several", it means one or more, and the meaning of "more" is two or more. Greater than, less than, and more than are understood to exclude the number itself, and above, below, and within are understood to include the number itself. If there is a description of the first, second, and third, it is only used to distinguish the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0034] The following is combined with Figure 1-8 , an embodiment of a Venturi steam trap with bypass of the utility model is further described in detail.

[0035] A Venturi steam trap with bypass, such as Figure 1 , 2As shown, it comprises a valve body 1 with a hollow inner cavity, a slide-type valve core is arranged in the hollow cavity of the valve body 1, and the slide-type valve core comprises a movable disk 3 base 2, a movable disk 3, a fixed disk 4 and a gland 5, and the movable disk 3 base 2, the movable disk 3, the fixed disk 4 and the gland 5 are sequentially installed on the valve body 1 from the inside to the outside, and a plurality of first flow channel holes 31 are opened on the movable disk 3; a plurality of second flow channel holes 41 are opened on the fixed disk 4; when the steam trap is closed, the first flow channel holes 31 and the second flow channel holes 41 are in a staggered closed state, and when the steam trap is opened, the first flow channel holes 31 and the second flow channel holes 41 are in an aligned and connected state;

[0036] One of the first flow channel holes 31 is aligned and connected with the second flow channel hole 41 to form a drain channel, and a Venturi nozzle 6 is threadedly connected to the drain channel so that when the drain valve is closed or opened, the drain channel on the Venturi nozzle 6 is in a normally open drain state.

[0037] Specifically, the steam trap is used in various production equipment, such as a heat exchanger. During the heat exchange process of the heat exchanger, a large amount of steam is needed to provide heat during the initial heating. The steam trap can be opened, and the steam trap and the Venturi nozzle 6 can be used to drain water together to provide a large amount of heat. For example, when the heat exchanger is initially heated up, the steam trap can be opened to quickly discharge the cold water accumulated in the original heat exchanger. After the cold water is drained, the steam trap can be closed to drain water normally, which can increase the heating rate. Or, when the machine is shut down, the steam trap can be opened to use the residual steam in the original heat exchanger to discharge the condensed water as soon as possible, so that the condensed water will not accumulate in the heat exchanger, reduce the generation of water hammer when starting up, and quickly increase the temperature. When the heat exchanger does not need a large amount of steam for normal heating, the steam trap is closed to keep the Venturi nozzle 6 in a draining state. The steam-water mixture can be drained through the Venturi nozzle 6, thereby ensuring effective drainage while preventing steam leakage, making it suitable for applications with huge changes in steam load.

[0038] Among them, Figures 3 to 6As shown, the first flow channel hole 31 and the second flow channel hole 41 are both U-shaped structures, and the diameters of the first flow channel hole 31 and the second flow channel hole 41 are the same. In the present utility model, the first flow channel hole 31 and the second flow channel hole 41 are at least three, and one of the first flow channel holes 31 or the second flow channel hole 41 is changed from a U-shaped hole to a threaded hole, so as to facilitate the installation of the Venturi nozzle 6. The Venturi nozzle 6 can be fixed in the first flow channel hole 31 on the movable plate 3, and can also be fixed in the second flow channel hole 41 on the fixed plate 4, but it is necessary to ensure that the flow channel holes where the Venturi nozzle 6 is set are in a state of interconnection, that is, to ensure that the Venturi nozzle 6 is in a state of interconnection regardless of whether the steam trap is closed or opened. The flow channels of the nozzles 6 are always in a drain state; that is, when the drain valve is closed, condensed water in the steam-water mixture can be drained through the Venturi nozzle 6, and when the drain valve is opened, the condensed water is directly discharged quickly through the flow channel of the drain valve (equivalent to opening a bypass); and when the remaining first flow channel holes 31 on the movable disk 3 and the second flow channel holes 41 on the fixed disk 4 are aligned and connected, the first flow channel holes 31 and the second flow channel holes 41 form a flow channel so that the fluid can flow out through the flow channel; and when the first flow channel holes 31 and the second flow channel holes 41 on the movable disk 3 and the fixed disk 4 are staggered from each other, the flow channel is blocked, which is equivalent to closing the valve, so that the fluid is blocked in front of the flow channel.

[0039] It is worth mentioning that the flow coefficient of the steam trap can be designed and produced according to the user's actual working conditions, and the flow curve can be linear or equal percentage.

[0040] In this embodiment, if Figure 2 As shown, the valve body 1 includes a circular ring segment 11 and a sleeve segment 12. Openings connected to the hollow inner cavity are provided at both ends of the circular ring segment 11. A flange fixing plate 413 is detachably connected to the opening, and the flange fixing plate 413 is connected to the valve body 1. The sleeve segment 12 is arranged perpendicular to the circular ring segment 11, and the sleeve segment 12 and the circular ring segment 11 are an integrally formed structure.

[0041] Specifically, the vertical cross-section of the valve body 1 is a T-shaped structure. On the one hand, the circular ring section 11 at its bottom can be connected to the slide-type valve core to control the flow of steam; on the other hand, the sleeve section 12 at its top can cooperate to control the opening and closing of the slide-type valve core to meet production needs.

[0042] In this embodiment, if Figure 1 As shown, the base 2 of the movable disk 3 presses the movable disk 3 against the fixed disk 4 by means of springs 21 arranged on both sides, and one end of the base 2 of the movable disk 3 is engaged with the valve stem 7 through a groove 22, and moves up and down following the valve stem 7; the valve stem 7 is installed in the sleeve section 12, and a valve stem sealing assembly 8 is connected between the valve stem 7 and the port of the sleeve section 12; the valve stem 7 extends out of the valve stem sealing assembly 8 and is transmission-connected to a lifting drive actuator 9, and the lifting drive actuator 9 is used to drive the valve stem 7 to drive the base 2 of the movable disk 3 to slide up and down.

[0043] Specifically, the valve stem sealing assembly 8 includes a sealing valve cover 81, a spring compensator 82 and a sealing ring 83; the sealing valve cover 81 is screwed onto the top of the sleeve section 12 by threads, and a sealing gasket 84 is sleeved at the connection between the sealing valve cover 81 and the sleeve section 12; the spring compensator 82 is arranged in the sleeve section 12, and the spring compensator 82 is sleeved on the outer surface of the valve stem 7; a plurality of sealing rings 83 are arranged, and the plurality of sealing rings 83 are sleeved on the sealing valve cover 81 and the spring compensator 82 respectively. The sealing valve cover 81 can be used to seal the gap between the sleeve section 12 and the valve stem 7, and the sealing valve cover 81 is further sealed with the sealing ring 83, thereby avoiding steam leakage when the steam trap is opened. At the same time, a spring compensator 82 is provided to compensate for the tension change in the valve stem 7. Since the steam trap acts in high-temperature steam, the valve stem 7 will be affected by the temperature. After the length of the valve stem 7 changes (caused by temperature), the tension in the contact suspension and the position of the contact line are kept basically constant as much as possible; when the temperature changes, the valve stem 7 is affected by the temperature and extends or shortens. Due to the action of the spring compensator 82, the valve stem 7 moves along the line direction and automatically adjusts the tension of the valve stem 7 to keep the sag of the valve stem 7 in compliance with the regulations; the specific working process is that a spring with a certain initial compression force and a fixing rope wound around the valve stem 7 are installed inside the spring compensator 82. When the soft cross-over upper and lower fixing ropes are extended, the spring is released, and the valve stem 7 is retracted to tighten the soft cross-over upper and lower fixing ropes; when the upper and lower fixing ropes shrink, the spring is compressed, and the valve stem 7 is extended, so that the tension of the soft cross-over upper and lower fixing ropes is kept within a certain range.

[0044] In this embodiment, the lifting drive actuator 9 includes a lifting rod 91, a connecting plate 92 and an actuator 93; the lower part of the lifting rod 91 is connected to the valve stem 7, the middle part of the lifting rod 91 is connected to the connecting plate 92 through a thread, and the upper part of the lifting rod 91 is transmission-connected to the actuator 93; the actuator 93 drives the lifting rod 91 and the valve stem 7 to move up and down to open or close the slide-type valve core; wherein, the connecting plate 92 is a square-shaped structure composed of multiple plate bodies spliced ​​together, and one end of the connecting plate 92 is fixed to the sleeve section 12 through a round nut 94.

[0045] Specifically, the sliding of the movable disk 3 is driven by the lifting drive actuator 9. During the driving process, the actuator driver 93 provides a driving source, thereby driving and controlling the lifting rod 91 to move up and down, and at the same time driving the valve stem 7 to move synchronously, thereby causing the base 2 of the movable disk 3 connected to the valve stem 7 through the groove 22 to slide, thereby completing the valve opening and closing control of the steam trap.

[0046] It is worth noting that if Figure 7 , 8As shown, the actuator 93 can be a hand wheel, an electric actuator or a pneumatic actuator; different actuators 93 can be selected according to production needs, wherein the hand wheel is a manual rotation control, and the lifting rod 91 and the valve stem 7 are driven up and down by rotating the hand wheel, thereby opening or closing the steam trap; and the electric actuator or the pneumatic actuator are both used to automatically switch the steam trap; the opening of the steam trap can even be automatically controlled by detecting the temperature of the condensed water after the valve to achieve automatic drainage; generally, the Venturi nozzle 6 is used for drainage at a small flow rate, and the electric / pneumatic control of the steam trap opening is used for drainage at a large flow rate, so as to avoid steam leakage and meet production needs.

[0047] In addition, the valve body 1 can be connected to the heating device by using a flange or a clamping type. Different connection methods are only for heating devices that do not pass through, so they are not limited in the present utility model.

[0048] Furthermore, the fixed disk 4 is pressed against one of the openings of the valve body 1 by the gland 5, and a cushion block 10 is connected between the fixed disk 4 and the gland 5. The cushion block 10 enables the gland 5 to be sealed and connected to the valve body 1, while also ensuring a tight connection between the fixed disk 4 and the gland 5, thereby further improving the sealing effect of the steam trap.

[0049] The working principle of this utility model:

[0050] When the steam trap is used for draining, the opening and closing of the slide valve core is controlled by the lifting and driving actuator 9, so that when the steam trap is opened, the first flow channel hole 31 on the movable disk 3 is aligned and connected with the second flow channel hole 41, so that the steam trap can drain normally, and at the same time, the condensed water is directly discharged quickly through the flow channel of the steam trap (equivalent to opening a bypass). When the steam trap is closed, the first flow channel hole 31 and the second flow channel hole 41 are staggered and not connected to each other, and the steam cannot be discharged through the normal flow channel hole, while the Venturi nozzle 6 set on one side remains in a normally open state. Therefore, even when the steam trap is closed, the condensed water in the steam-water mixture can also be drained through the Venturi nozzle 6 without affecting its operation.

[0051] 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 Venturi steam trap with bypass, characterized in that: It comprises a valve body with a hollow inner cavity, a slide-type valve core is arranged in the hollow cavity of the valve body, the slide-type valve core comprises a movable disc base, a movable disc, a fixed disc and a gland, the movable disc base, the movable disc, the fixed disc and the gland are sequentially installed on the valve body from inside to outside, a plurality of first flow channel holes are opened on the movable disc; a plurality of second flow channel holes are opened on the fixed disc; when the steam trap is closed, the first flow channel holes and the second flow channel holes are in a dislocated closed state, and when the steam trap is opened, the first flow channel holes and the second flow channel holes are in an aligned connected state; One of the first flow channel holes is aligned with the second flow channel hole and connected to form a drain channel, and a Venturi nozzle is threadedly connected to the drain channel; so that when the drain valve is closed or opened, the drain channel on the Venturi nozzle is in a normally open drain state.

2. The Venturi steam trap with bypass according to claim 1, characterized in that: The valve body includes a circular ring segment and a sleeve segment. Openings communicating with the hollow inner cavity are formed at both ends of the circular ring segment. A flange fixing plate is detachably connected to the opening, and the flange fixing plate is communicated with the valve body. The sleeve segment is arranged perpendicular to the circular ring segment, and the sleeve segment and the circular ring segment are an integrally formed structure.

3. The Venturi steam trap with bypass according to claim 2, characterized in that: The movable disk base is provided with springs on both sides to press the movable disk onto the fixed disk, and one end of the movable disk base is connected with the valve stem through a groove clamping, and moves up and down with the valve stem.

4. The Venturi steam trap with bypass according to claim 3, characterized in that: The valve stem is installed in the sleeve section, and a valve stem sealing assembly is connected between the valve stem and the port of the sleeve section; the valve stem extends out of the valve stem sealing assembly and is transmission-connected to a lifting drive actuator assembly, and the lifting drive actuator assembly is used to drive the valve stem to drive the movable disk base to slide up and down.

5. The Venturi steam trap with bypass according to claim 4, characterized in that: The valve stem sealing assembly includes a sealing valve cover, a spring compensator and a sealing ring; the sealing valve cover is screwed onto the top end of the sleeve section through threads, and a sealing gasket is sleeved at the connection between the sealing valve cover and the sleeve section; the spring compensator is arranged in the sleeve section, and the spring compensator is sleeved on the outer side of the valve stem; a plurality of sealing rings are provided, and the plurality of sealing rings are respectively sleeved on the sealing valve cover and the spring compensator.

6. The Venturi steam trap with bypass according to claim 4, characterized in that: The lifting drive actuator assembly includes a lifting rod, a connecting plate and an actuator; the lower part of the lifting rod is connected to the valve stem, the middle part of the lifting rod is connected to the connecting plate through a thread, and the upper part of the lifting rod is transmission-connected to the actuator; the actuator drives the lifting rod and the valve stem to move up and down to open or close the slide-type valve core.

7. The Venturi steam trap with bypass according to claim 6, characterized in that: The connecting plate is a square-shaped structure composed of a plurality of plates spliced ​​together, and one end of the connecting plate is fixed to the sleeve section through a round nut.

8. The Venturi trap with bypass according to claim 6, characterized in that: The actuator is a hand wheel, an electric actuator or a pneumatic actuator.

9. The Venturi steam trap with bypass according to claim 2, characterized in that: The fixing plate is pressed onto one of the openings of the valve body by the pressure cover, and a cushion block is connected between the fixing plate and the pressure cover.

10. The Venturi trap with bypass according to claim 1, characterized in that: The first flow channel hole and the second flow channel hole are both U-shaped structures, and the diameters of the first flow channel hole and the second flow channel hole are the same.

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