Zero-steam-leakage lever floating ball type drain valve

Abstract

The utility model relates to a lever floating ball type drain valve with zero steam leakage, which belongs to the field of valves and comprises a valve body, a valve cover, a valve core, a valve seat, a floating ball, a lever and an exhaust valve, the exhaust valve is arranged in an inner cavity of the valve body, at the initial stage of starting of equipment, the water level of condensate water in the valve cavity is lower than the position of a water outlet, air in the valve cavity is discharged through the water outlet, and the phenomenon of air blockage is prevented. When steam enters the valve cavity, the exhaust valve diaphragm is expanded and closed due to temperature rise, and steam circulation is prevented; the buffering water tank is arranged at the left end of the lever, the floating ball is controlled to fall slowly along with gradual discharging of condensate water in an inner cavity of the buffering water tank when the floating ball falls, impact between the valve element and the valve seat is reduced, and impact damage of a sealing pair is avoided. The utility model has the advantages of zero steam leakage, reliable sealing performance, long service life and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the valve field especially relates to a lever ball float type drain valve. BACKGROUND

[0002] Drain valve is used for steam pipeline system, automatically removes the condensed water in steam using equipment and pipeline. There are many kinds of drain valves, and the lever ball float type drain valve is one of the common structures, which uses water level to lift the float ball, and opens the valve to discharge the condensed water through the lever. For example, the "lever ball float type drain valve" with the application number CN202222420760.0 forms a valve cavity and a drainage cavity in the valve body through a partition plate, the valve cavity is connected with the inlet, the drainage cavity is connected with the water outlet, the drainage valve core connected with the lever and the float ball is arranged on the partition plate, and the exhaust valve is arranged on the upper part of the valve cavity to exhaust the air in the valve cavity and prevent air blockage. The main disadvantage is that the exhaust valve is installed on the upper part of the valve body, and the diaphragm is inflated at high temperature to seal with the valve seat, which is easy to cause steam leakage; the connecting rod is arranged on the lifting frame, and the lead screw driving the lifting frame to move up and down is installed at the bottom of the valve body, which increases the leakage point of the valve body and reduces the sealing performance; when the steam pressure fluctuation causes the valve cavity pressure fluctuation to be large, the float ball is easy to be impacted, the valve disc is vibrated to impact the valve seat, the sealing surface is damaged, and even the steam is leaked. CONTENT OF THE UTILITY MODEL

[0003] The utility model provides a valve body without external leakage point, and the falling speed of the float ball can be reduced through the buffer water tank, the impact damage of the valve disc and the valve seat is avoided, the sealing performance is reliable, and the zero steam leakage lever ball float type drain valve is provided.

[0004] The technical scheme of the utility model is realized as follows:

[0005] A zero steam leakage lever floating ball type drain valve, comprising a valve body, a valve cover, a valve core, a valve seat, a floating ball, a lever, one end of the lever is fixedly connected with the floating ball, the other end is fixed in the inner cavity of the valve body through a mounting seat, the inner cavity of the valve body is communicated with a steam pipeline, the valve core and the valve seat form a sealing pair; characterized in that: the mounting seat is composed of a lever mounting seat, a valve seat mounting seat and a drain pipe; the valve seat mounting seat has an L-shaped inner hole, the valve seat is mounted above the horizontal hole of the L-shaped inner hole, the inner hole of the valve seat is communicated with the L-shaped inner hole, and the upper end of the sealing surface of the valve seat is communicated with the valve cavity; the lever mounting seat is fixedly mounted on the valve seat mounting seat outside the valve seat, the lever is rotatably mounted on the lever mounting seat on the left side of the valve seat through a pin, the valve core adopts a cylindrical pin structure and is movably mounted in the guide hole of the lever mounting seat, the guide hole is concentric with the through hole of the valve seat, the upper end of the valve core is rotatably mounted on the lever through a pin shaft, the upper end of the lever mounting seat is provided with a radial positioning groove, and the lever is located in the radial positioning groove to prevent the lever from swinging radially when the floating ball is impacted; one end of the drain pipe is fixedly mounted on the valve cover, the other end is fixedly mounted on the valve seat mounting seat, the inner hole of the drain pipe is communicated with the drain port on the valve cover at one end and communicated with the vertical hole of the L-shaped inner hole of the valve seat mounting seat at the other end, the outlet of the drain port is connected with a condensate water recovery pipe, the position of the outlet is higher than the upper end surface of the sealing surface of the valve seat, a diaphragm box type exhaust valve is arranged at the upper end of the vertical hole of the L-shaped inner hole of the valve seat mounting seat, the diaphragm box type exhaust valve is opened at low temperature to discharge air by communicating the valve cavity with the drain port, and the diaphragm in the diaphragm box is expanded to be closed to block steam at high temperature.

[0006] In the above technical scheme, the buffer water tank is fixedly mounted at the left end of the lever, the lower end surface of the buffer water tank is provided with a through hole communicating the inner cavity with the valve cavity, and the weight of the buffer water tank when the inner cavity is filled with water is smaller than the weight of the floating ball, so that the floating ball can slowly fall.

[0007] In the above technical scheme, the upper end surface of the valve seat is sealingly connected with the lower end of the guide hole of the lever mounting seat, the water suction pipe communicated with the guide hole is arranged on the side wall of the lever mounting seat, and the inner hole of the water suction pipe connected with the lever mounting seat at one end is lower than the drain port and the other end is lower than the horizontal hole of the L-shaped inner hole.

[0008] The beneficial effects of the utility model compared with the prior art are:

[0009] 1. The exhaust valve is arranged in the inner cavity of the valve body, at the initial stage of starting the equipment, the water level of the condensate water in the valve cavity is lower than the position of the drain port, the air in the valve cavity is discharged through the drain port to prevent the gas block phenomenon, when the steam enters the valve cavity, the diaphragm of the exhaust valve is expanded to be closed due to the temperature rise, the steam flow is blocked, and the zero steam leakage is realized;

[0010] 2. The buffer water tank is arranged at the left end of the lever, when the floating ball falls, the condensate water in the inner cavity of the buffer water tank is gradually discharged to control the floating ball to slowly fall, the impact between the valve core and the valve seat is reduced, the sealing pair is prevented from being damaged, the sealing performance and the service life of the product are improved. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] In the diagram: 1 Steam pipe, 2 Valve cover, 3 Drain pipe, 4 Valve seat mounting base, 5 Buffer water tank, 6 Valve seat, 7 Pin, 8 Valve core, 9 Lever, 10 Float, 11 Valve body, 12 Lever mounting base, 13 Suction pipe, 14 Pin, 15 L-shaped inner hole, 16 Air vent valve, 17 Drain outlet, 18 Water level discharge line. Detailed Implementation

[0013] like Figure 1The zero-steam-leakage lever-float steam trap includes a valve body 11, a valve cover 2, a valve core 8, a valve seat 6, a float 10, and a lever 9. The float 10 is made of hollow steel ball. One end of the lever 9 is fixedly connected to the float 10, and the other end is fixed to the inner cavity of the valve body 11 via a mounting base. The inner cavity of the valve body 11 is connected to the flow channel of the steam pipe 1. The valve core 8 and the valve seat 6 form a sealing pair. When the equipment is turned on to transport steam, the condensate in the steam pipe 1 flows into the valve cavity. As the water level in the valve cavity rises, the float 10 floats up, the valve core 8 disengages from the valve seat 6, and the valve opens. The condensate is discharged through the valve seat 6. When the condensate is discharged to the set water level, the float 10 falls, causing the valve core 8 and the valve seat 6 to seal and close, preventing steam leakage. Its characteristic is that the mounting base is formed by a lever. The system comprises a mounting base 12, a valve seat mounting base 4, and a drain pipe 3. The valve seat mounting base 4 has an L-shaped inner hole 15. The valve seat 6 is fixedly mounted above the transverse hole of the L-shaped inner hole 15. The inner hole of the valve seat 6 communicates with the L-shaped inner hole 15, and the upper end of the sealing surface of the valve seat 6 communicates with the valve cavity. The lever mounting base 12 is fixedly mounted on the valve seat mounting base 4 outside the valve seat 6. The lever 9 is rotatably mounted on the lever mounting base 12 on the left side of the valve seat 6 via a pin 7. The valve core 8 adopts a cylindrical pin structure and is movably mounted in the guide hole of the lever mounting base 12. This guide hole is concentric with the through hole of the valve seat 6. The upper end of the valve core 8 is rotatably mounted on the lever 9 via a pin 14. When the float 10 rises, it drives the lever 9 to rotate counterclockwise around the pin 7, and simultaneously drives the valve core 8 to rotate counterclockwise around the pin 14. 4 rotates around the center and is lifted within the guide hole of the lever mounting base 12 to maintain the concentricity of the sealing surfaces between the valve core 8 and the valve seat 6. The upper end of the lever mounting base 12 is provided with a radial positioning groove, and the lever 9 is located within this radial positioning groove to prevent the float 10 from being impacted and causing the lever 9 to swing radially, resulting in misalignment between the sealing surfaces of the valve core 8 and the valve seat 6. One end of the drain pipe 3 is fixedly installed on the valve cover 2, and the other end is fixedly installed on the valve seat mounting base 4. One end of its inner hole is connected to the drain port 17 on the valve cover 2, and the other end is connected to the vertical hole of the L-shaped inner hole 15. The outlet of the drain port 17 is connected to the condensate recovery pipe. The position of the drain port 17 is higher than the upper surface of the sealing surface of the valve seat 6. The drain port 17 is located below the water level discharge line 18. When the valve cavity is filled with water... When the water level is higher than the discharge line 18, the float 10 rises, causing the valve core 8 to rise, opening the sealing pair to discharge condensate. An air vent valve 16 is installed at the upper end of the vertical hole of the L-shaped inner hole 15. This air vent valve 16 adopts a diaphragm box structure. It opens at low temperatures to connect the valve chamber with the drain port 17 to discharge air. At high temperatures, the diaphragm inside the diaphragm box expands, causing the air vent valve 16 to close and block steam. In the initial stage of equipment operation, the condensate water level in the valve chamber is lower than the discharge line 18. The valve core 8 and valve seat 6 are in the closed state, and the air vent valve 16 is in the open state. Air is discharged from the drain port 17 through the air vent valve 16, avoiding air resistance. When the condensate water level in the valve chamber exceeds the discharge line 18, the valve core 8 rises and opens the sealing pair, and the condensate is discharged from the drain port 16 through the valve seat 6.When the condensate level reaches the discharge line 18, the valve core 8 and valve seat 6 close. The water accumulated in the transverse hole of the L-shaped inner hole 15 and the condensate in the valve cavity form a bidirectional water seal between the valve seat 6 and valve core 8, improving the sealing performance. At the same time, the air vent valve 16 closes as the temperature inside the valve cavity rises. The structure and working principle of the air vent valve 16 are well-known technologies and will not be described in detail here.

[0014] A buffer water tank 5 is fixedly installed on the left end of the lever 9. The lower end face of the buffer water tank 5 is provided with a through hole connecting its inner cavity and the valve cavity. When the inner cavity of the buffer water tank 5 is full of water, its weight is less than the weight of the float 10. When the float 10 falls, the buffer water tank 5 is filled with water, and the water in its inner cavity flows out from the through hole, causing the float 10 to fall slowly. This avoids the collision between the valve core 8 and the valve seat 6, protects the safety of the sealing surfaces of both, improves the sealing performance, and extends the service life of the product.

[0015] The upper end face of the valve seat 6 is sealed to the lower end of the guide hole of the lever mounting seat 12. A suction pipe 13 connected to the guide hole is provided on the side wall of the lever mounting seat 12. The inner hole of one end of the suction pipe 13 is lower than the drain outlet 17, and the other end is lower than the transverse hole of the L-shaped inner hole 15, which reduces water surface fluctuation when condensate is discharged and improves the stability of the float 10.

[0016] The directional words such as "left," "right," "up," and "down" in this utility model are used to describe the positions in the figure and should not be construed as limiting this utility model.

Claims

1. A zero-steam-leakage lever-floating-ball type drain valve, comprising a valve body (11), a valve cover (2), a valve core (8), a valve seat (6), a floating ball (10), and a lever (9), one end of the lever (9) being fixedly connected with the floating ball (10), and the other end being fixedly installed in an inner cavity of the valve body (11) through a mounting seat, the inner cavity of the valve body (11) being in flow communication with a steam pipeline (1), and the valve core (8) and the valve seat (6) forming a sealing pair; characterized in that: The mounting seat is composed of a lever mounting seat (12), a valve seat mounting seat (4) and a drain pipe (3); the valve seat mounting seat (4) has an L-shaped inner hole (15), a valve seat (6) is fixedly installed above the transverse hole of the L-shaped inner hole (15), the inner hole of the valve seat (6) is communicated with the L-shaped inner hole (15), and the upper end of the sealing surface of the valve seat (6) is communicated with the valve cavity; the lever mounting seat (12) is fixedly installed on the valve seat mounting seat (4) outside the valve seat (6), a lever (9) is rotatably installed on the lever mounting seat (12) left side of the valve seat (6) through a pin (7), a valve core (8) in a cylindrical pin structure is movably installed in the guide hole of the lever mounting seat (12), the guide hole is concentric with the inner hole of the valve seat (6), the upper end of the valve core (8) is rotatably installed on the lever (9) through a pin shaft (14), the upper end of the lever mounting seat (12) is provided with a radial positioning groove, and the lever (9) is arranged in the radial positioning groove; one end of the drain pipe (3) is fixedly installed on the valve cover (2), the other end is fixedly installed on the valve seat mounting seat (4), the inner hole of the drain pipe (3) is communicated with the drain port (17) on the valve cover (2) at one end and communicated with the vertical hole of the L-shaped inner hole (15) at the other end, the outlet of the drain port (17) is connected with a condensed water recovery pipe, the position of the drain port (17) is higher than that of the upper end surface of the sealing surface of the valve seat (6), and the drain port 17 is located below the water level discharge line 18; an exhaust valve (16) is arranged at the upper end of the vertical hole of the L-shaped inner hole (15), the exhaust valve (16) adopts a diaphragm box type structure, is opened at low temperature to communicate the valve cavity with the drain port (17) and discharge air, and is closed to block steam when the diaphragm in the diaphragm box expands at high temperature. ​ 2. The zero vapor leakage lever and float type trap according to claim 1, wherein: A buffer water tank (5) is fixedly installed at the left end of the lever (9), the lower end surface of the buffer water tank (5) is provided with a through hole communicating the inner cavity of the buffer water tank (5) with the valve cavity, and the weight of the buffer water tank (5) when the inner cavity is filled with water is less than the weight of the float ball (10).

3. A zero vapour leakage lever and float type trap according to claim 1 or 2 wherein: The upper end surface of the valve seat (6) is sealingly connected with the lower end of the guide hole of the lever mounting seat (12), a water suction pipe (13) is arranged on the side wall of the lever mounting seat (12) and communicated with the guide hole, and the inner hole of the water suction pipe (13) connected with the lever mounting seat (12) is lower than the drain port (17) at one end and lower than the transverse inner hole of the L-shaped inner hole (15) at the other end.

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