A steam trap with improved flow control accuracy

Abstract

A steam trap for improving flow control accuracy comprises a Y-shaped valve body, a filter assembly, a valve seat, a valve plate, a valve core, a connecting flange and a valve cover, wherein an inlet and an outlet are respectively provided at both ends of the valve body, a flow guide channel is provided at the middle bottom, and the connecting flange is fixedly connected to the inlet and the outlet of the valve body, the filter assembly is arranged in the flow guide channel, the valve seat is arranged inside the valve body, and the lower end is connected to the valve core, the upper end is provided with a valve plate, and the lower end surface of the valve plate is provided with capillary grooves regularly distributed through the center of a circle; it also comprises a valve stem and a limit assembly, the limit assembly comprises a limit rod, the lower end of the valve stem is hemispherical, which can be closely matched with the valve core, the upper end passes through the valve plate and can contact with the lower end of the limit rod, and the upper end of the limit rod passes through the valve cover. The present invention provides a steam trap for improving flow control accuracy by adjusting the internal structure during use to accurately control the flow, thereby reducing steam leakage during the long-term opening and closing of the valve plate.

Description

Technical Field

[0001] The invention relates to the field of steam traps, and in particular to a steam trap capable of improving flow control accuracy. Background Art

[0002] The function of steam trap (referred to as steam trap) is to automatically remove steam condensate and non-condensable gases such as air in heating equipment or steam pipelines without leaking steam. Since the steam trap has the function of blocking steam and draining water, it can make the steam heating equipment evenly heat. The basic function of the steam trap is to discharge the air and cold non-condensable gases in the steam system and the condensate generated after the steam is used as soon as possible, while automatically preventing steam leakage.

[0003] In the prior art, even when the steam trap is operating normally, some steam must leak in order to close the valve in order to generate the pressure difference required to close the valve. In addition, the valve's opening and closing frequency is too high, which affects the durability of the valve. In addition, the prior art does not have sufficient means for controlling the flow of the steam trap, causing the flow to fluctuate and making it impossible to stably maintain the preset flow. The flow accuracy deviation often exceeds the permitted range of industrial standards.

[0004] Therefore, the present invention provides a steam trap with improved flow control accuracy, which can accurately control the flow rate by adjusting the internal structure during use, thereby reducing steam leakage during the long-term opening and closing of the valve plate. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide a steam trap that can accurately control the flow rate by adjusting the internal structure and reduce steam leakage when the valve is opened and closed for a long time, thereby solving the problems in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the present invention is as follows: A steam trap for improving flow control accuracy comprises a Y-shaped valve body, a filter assembly, a valve seat, a valve disc, a valve core, a connecting flange and a valve cover, wherein an inlet and an outlet are respectively provided at two ends of the valve body, a guide channel is provided at the middle bottom, the connecting flange is fixedly connected to the inlet and the outlet of the valve body, the filter assembly is arranged in the guide channel, the valve seat is arranged inside the valve body, and the valve core is connected to the lower end of the valve seat, the valve disc is arranged at the upper end of the valve seat, and capillary grooves regularly distributed through the center of a circle are arranged on the lower end surface of the valve disc, a second channel connecting the inside of the valve body and the inside of the valve core is arranged on the side of the valve seat, and the second channel is connected to the bottom of the valve disc through a third channel, and also comprises a valve stem and a limit assembly, the limit assembly comprises a limit rod, the lower end of the valve stem is a hemisphere and is tightly matched with the valve core, the upper end of the valve stem passes through the valve disc, the lower end of the limit rod limits the axial stroke of the valve stem, and the upper end of the limit rod passes through the valve cover.

[0007] Preferably, the valve stem further comprises a valve stem shoulder, and the lower end surface of the valve stem shoulder is tightly matched with the upper end surface of the valve plate.

[0008] Preferably, a circular notch is formed at the lower end of the valve core, and a diameter of the upper opening is slightly larger than a diameter of the valve stem, so that the circular notch can achieve close contact with the hemispherical portion of the lower end of the valve stem.

[0009] Preferably, the outer peripheral contour of the valve core is consistent with the inner contour of the lower end of the valve seat and fits tightly.

[0010] Preferably, an opening is provided at the upper end of the valve cover for the limit rod to pass through, and a sealing member is provided at the middle of the upper end of the valve cover.

[0011] Preferably, an outer circumference of the upper end of the limiting rod is provided with an external thread, which is threadedly connected to the valve cover.

[0012] Preferably, the limiting assembly further comprises a handwheel, the handwheel is connected and fixed to the limiting rod via a nut, and an arrow direction for controlling the flow rate is engraved on the upper end face of the handwheel.

[0013] Preferably, the limiting rod comprises a limiting protrusion, and the diameter of the limiting protrusion is larger than the diameter of the upper opening of the valve cover.

[0014] Preferably, an annular protrusion is provided inside the valve body and is in close contact with the lower end of the valve core, and the valve core is confined between the valve seat and the annular protrusion.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. The present invention reduces the mirror surface area and prolongs the time of opening the valve plate by arranging capillary grooves regularly distributed through the center of the circle on the lower end surface of the valve plate. Condensed water can be smoothly discharged from the capillary grooves, effectively reducing steam leakage;

[0017] Second, the present invention sets the lower end of the valve stem to be in a hemispherical shape, and the circular notch at the lower end of the valve core is adjusted to adapt to the different steam flow requirements at different reaction stages in production, thereby achieving flow control;

[0018] 3. The present invention realizes effective sealing of the valve by providing a close fit between the valve core and the valve seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0020] Figure 1 It is a three-dimensional structural schematic diagram of a steam trap for improving flow control accuracy according to the present invention;

[0021] Figure 2 A three-dimensional cross-sectional view of a steam trap for improving flow control accuracy according to the present invention;

[0022] Figure 3 for Figure 1 The overall structural cross-section view along the AA direction in the structure;

[0023] Figure 4 for Figure 2 A cross-sectional view of the main structure inside the valve body in the structure;

[0024] Figure 5 for Figure 4 Detailed cross-sectional view of the valve core in the structure;

[0025] Figure 6 It is a schematic diagram of the structure of the valve plate;

[0026] Figure 7 for Figure 2 Exploded diagram of the filter components in the structure;

[0027] Figure 8 for Figure 2 Exploded diagram of the limiter assembly in the structure;

[0028] In the figure: 1-valve body; 10-valve cavity; 11-flow guide channel; 12-first channel; 13-annular protrusion;

[0029] 2-filter assembly; 20-filter screen; 21-gasket; 22-plug;

[0030] 3-valve seat; 30-second channel; 31-third channel; 4-valve plate; 40-capillary groove;

[0031] 5-connecting flange; 50-inlet flange; 51-outlet flange;

[0032] 6-valve cover; 7-valve stem; 70-valve stem shoulder;

[0033] 8-limiting assembly; 80-limiting rod; 801-limiting protrusion; 81-handwheel; 82-nut; 83-washer; 84-seal;

[0034] 9-valve core; 90-circular notch. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0037] The directions and positions mentioned in the present invention, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only directions or positions with reference to the drawings. Therefore, the directions and positions used are used to explain and understand the present invention, but are not intended to limit the scope of protection of the present invention.

[0038] Example:

[0039] The present invention provides a steam trap with improved flow control accuracy, which mainly controls the flow accurately by adjusting the internal structure during use, thereby reducing steam leakage during the long-term opening and closing of the valve plate.

[0040] See also Figures 1 to 3 In an embodiment of the present invention, a steam trap for improving flow control accuracy comprises a Y-shaped valve body 1, a filter assembly 2, a valve seat 3, a valve plate 4, a connecting flange 5, a valve cover 6, a valve stem 7, a limit assembly 8 and a valve core 9, wherein the valve body 1 is provided with an inlet and an outlet at both ends, a guide channel 11 is provided at the middle bottom, the filter assembly 2 is provided in the guide channel 11, a first channel 12 is provided in the valve body 1, the first channel 12 is communicated with the guide channel 11, the upper end of the valve body 1 is connected and fixed to the valve cover 6, and the valve A chamber 10 is formed between the valve body 1 and the valve cover 6, and the chamber 10 is communicated with the guide channel 11 through the first channel 12. The valve seat 3 is arranged in the chamber 10, and is fixedly connected to the valve body 1 through an external thread arranged at the lower end, and a valve plate 4 is arranged at the upper end. The lower end of the valve stem 7 passes through the valve seat 3 and can contact the valve core 9, and the upper end can abut against the limit assembly 8. The limit assembly 8 includes a limit rod 80, and the limit rod 80 passes through the valve cover 6 through an external thread arranged at the upper end and is threadedly connected thereto.

[0041] Specifically, when the valve is working, different pressure differences are generated on the upper and lower parts of the valve plate 4 according to the flow rate and volume changes of steam and condensed water when they pass through. Condensed water flows into the valve through the inlet of the valve body 1, and flows into the chamber 10 through the guide channel 11 and the first channel 12. At this time, there are only condensed water and air in the chamber 10. The condensed water and air push the valve plate 4 open by the working pressure, and the condensed water is quickly discharged; when the steam reaches the valve body 1, the pressure at the lower end of the valve plate is reduced because the volume of steam is larger than that of condensed water and the flow rate is faster. Under the pressure difference between the upper chamber and the lower outlet, the valve plate is quickly closed to prevent steam leakage; when the steam in the steam trap chamber 10 cools down to condensed water, the pressure on the upper end of the valve plate 4 disappears, and the condensed water at the outlet pushes the valve plate 4 open again by the working pressure until the condensed water is discharged, and the pressure difference at both ends is formed again to close, and the cycle works and the water is discharged intermittently.

[0042] See also Figures 4 to 6 The valve core 9 is arranged inside the lower end of the valve seat 3, and the lower end of the valve core 9 is tightly based on the annular protrusion 13 in the valve body 1. The outer peripheral contour of the valve core 9 is consistent with the inner contour of the lower end of the valve seat 3, and the diameter of the upper end opening is slightly smaller than the outer diameter of the valve stem 7. The lower end of the valve stem 7 is a hemispherical body, which can be tightly connected with the circular notch 90 opened at the lower end of the valve core 9. A valve stem shoulder 70 is provided on the valve stem 7, and the valve plate 4 is sleeved outside the valve stem 7, and the valve plate 4 is arranged between the valve seat 3 and the valve stem shoulder 70. The lower end surface of the valve plate 3 is provided with capillary grooves 30 regularly distributed through the center of the circle, and the side of the valve seat 3 is also provided with a second channel 30 and a third channel 31.

[0043] Specifically, when the valve is closed, the hemispherical body at the lower end of the valve stem 7 is tightly matched with the circular notch 90 opened at the lower end of the valve core, the lower end surface of the valve plate 4 is in contact with the upper end of the valve seat 3, and the lower end surface of the valve stem shoulder 70 is in contact with the upper end surface of the valve plate 4. At this time, the chamber 10 is filled with air; when the valve is opened, condensed water flows into the chamber 10, and after the condensed water flows into the internal space of the valve core 9 and the valve seat 3 through the second channel 30, the condensed water fills the third channel 31 through the second channel 30, pushes open the valve plate 4, and when the valve plate 4 rises, it drives the valve stem 7 to move upward, the lower end of the valve stem is separated from the circular notch 90, the valve is opened, and the condensed water flows out of the valve through the outlet. At this time, the chamber 10 is filled with condensed water and air; when steam flows into the valve, due to the flow rate of steam Faster than condensed water, steam flows into the chamber 10 and flows at a high speed at the lower end of the valve plate 4. At this time, a pressure difference is formed at the upper and lower ends of the valve plate 4. The valve plate 4 moves downward under the action of pressure, driving the valve stem 7 to move downward. At this time, the lower end surface of the valve plate 4 contacts the upper end of the valve seat 3, and the lower end of the valve stem 7 is tightly abutted against the circular notch 90, and the valve is closed. At this time, there is condensed water and steam in the chamber 10; after the valve is closed, the steam in the chamber 10 gradually cools down to condensed water, the pressure at the upper end of the valve plate 4 disappears, and the valve opens again; in the process of steam cooling down to condensed water, the capillary groove 40 arranged at the lower end of the valve plate 4 reduces the mirror area of ​​the lower end surface of the valve plate 4, and the steam can also be cooled down to condensed water in the capillary groove, which prolongs the time for the valve plate 4 to be pushed open, thereby preventing steam leakage.

[0044] See also Figure 7 The filter assembly 2 includes a filter screen 20, a gasket 21 and a plug 22. The filter screen 20 is arranged in the guide channel 11, and the outer diameter of the filter screen 20 is equivalent to the inner diameter of the plug 22, and the upper end of the filter screen 20 is in contact with the guide channel 11. The first channel 12 is connected to the guide channel 11 and is separated by the filter screen 20 in the middle. The plug extends into the guide channel 11 and is connected to the valve body 1 by threads.

[0045] Specifically, when condensate flows into the valve, it flows through the guide channel 11, fills the guide channel 11, and then flows into the chamber 10 through the first channel 12. During this process, the filter 20 filters impurities in the condensate to prevent the impurities from flowing into the chamber 10, causing wear and erosion to the internal components and shortening their service life. The plug 22 is connected to the valve body 1 by threads, and the filter component 2 can be disassembled at any time to clean or replace the filter 20.

[0046] See also Figure 8The limit assembly 8 includes a limit rod 80, a hand wheel 81, a nut 82 and a washer 83. The upper end of the limit rod 80 is provided with an external thread, which can be threadedly connected with the upper opening of the valve cover 6. The lower end of the limit rod 80 is provided with a limit bump 801, whose diameter is larger than the diameter of the upper opening of the valve cover 6. The hand wheel 81 is fixedly connected to the limit rod 80 through the nut 82 and the washer 83.

[0047] Specifically, the upper end face of the handwheel 81 is engraved with an arrow direction for controlling the flow rate. The axial position of the limit rod 80 is adjusted by the handwheel 81 to limit the lifting distance of the valve plate 4 and the valve stem 7 between the valve seat 3 and the limit protrusion 801. When the valve plate 4 drives the valve stem 7 to lift upward, the upper end of the valve stem 7 abuts against the lower end of the limit protrusion 801. By limiting the lifting height of the valve plate 4 and the valve stem 7, the separation degree of the hemisphere at the lower end of the valve stem 7 and the circular notch 90 is adjusted to achieve precise control of the flow rate.

[0048] When the hemisphere at the lower end of the valve stem 7 is slightly separated from the circular notch 90, the valve flow rate decreases. When the hemisphere at the lower end of the valve stem 7 is completely separated from the circular notch 90, the valve flow rate reaches a maximum, thereby meeting the flow rate required for different production conditions.

[0049] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A steam trap for improving flow control accuracy, comprising a Y-shaped valve body (1), a filter assembly (2), a valve seat (3), a valve plate (4), a valve core (9), a connecting flange (5) and a valve cover (6), wherein the valve body (1) is provided with an inlet and an outlet at two ends respectively, and a flow guide channel (11) is provided at the middle bottom, the connecting flange (5) is fixedly connected to the inlet and the outlet of the valve body (1), the filter assembly (2) is arranged in the flow guide channel (11), the valve seat (3) is arranged inside the valve body (1), and the valve core (9) is connected to the lower end of the valve seat (3), and the valve plate (4) is provided at the upper end of the valve seat (3), characterized in that: The lower end surface of the valve plate (4) is provided with capillary grooves (40) which are regularly distributed through the center of a circle, and the side of the valve seat (3) is provided with a second channel (30) which is connected to the interior of the valve body (1) and the interior of the valve core (9), and the second channel (30) is connected to the bottom of the valve plate (4) through a third channel (31). The valve plate (4) further comprises a valve stem (7) and a limit assembly (8), wherein the limit assembly (8) comprises a limit rod (80), the lower end of the valve stem (7) is a hemispherical body and is tightly matched with the valve core (9), the upper end of the valve stem (7) passes through the valve plate (4), the lower end of the limit rod (80) limits the axial travel of the valve stem (7), and the upper end of the limit rod (80) passes through the valve cover (6); The lower end of the valve core (9) is provided with a circular notch (90), the diameter of the upper opening is slightly larger than the diameter of the valve stem (7), and the circular notch (90) is in close contact with the hemispherical portion of the lower end of the valve stem (7).

2. A steam trap for improving flow control accuracy according to claim 1, characterized in that: The valve stem (7) further comprises a valve stem shoulder (70), the lower end surface of the valve stem shoulder (70) being tightly matched with the upper end surface of the valve plate (4).

3. A steam trap for improving flow control accuracy according to claim 1, characterized in that: The outer contour of the valve core (9) is consistent with the inner contour of the lower end of the valve seat (3), and fits tightly.

4. A steam trap for improving flow control accuracy according to claim 1, characterized in that: The upper end of the valve cover (6) is provided with an opening through which the limiting rod (80) can pass, and a sealing member (84) is provided in the middle of the upper end of the valve cover (6).

5. A steam trap for improving flow control accuracy according to claim 1, characterized in that: The upper end of the limiting rod (80) is provided with an external thread on its outer periphery and is connected to the valve cover (6) via a thread.

6. A steam trap for improving flow control accuracy according to claim 1, characterized in that: The limiting assembly (8) further comprises a hand wheel (81), wherein the hand wheel (81) is connected and fixed to the limiting rod (80) via a nut (82), and a direction arrow for controlling the flow rate is engraved on the upper end surface of the hand wheel (81).

7. A steam trap for improving flow control accuracy according to claim 1, characterized in that: The limiting rod (80) comprises a limiting protrusion (801), and the diameter of the limiting protrusion (801) is larger than the diameter of the upper opening of the valve cover (6).

8. A steam trap for improving flow control accuracy according to claim 1, characterized in that: An annular protrusion (13) is provided inside the valve body (1) and is in close contact with the lower end of the valve core (9). The valve core (9) is confined between the valve seat (3) and the annular protrusion (13).

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