Cock type large-displacement drain valve

Abstract

The utility model relates to a cock type large-displacement drain valve which comprises a valve body, a valve cover, a cock body, a valve rod and a handle. An inlet of the valve body is connected with a water inlet connecting pipe, and an outlet of the valve body is connected with a drain pipe. A discharging channel, an upper through hole and a lower through hole are formed in the cock body, in the initial stage, the handle is rotated to communicate the discharging channel of the cock body with the inlet and the outlet so that condensate water can be rapidly discharged, then the handle is rotated to communicate the upper through hole and the lower through hole of the cock body with the inlet and the outlet, the condensate water is discharged through a medium through the drainage steam blocking valve, and steam leakage is blocked; the condensate water is rapidly discharged, the condensate water is prevented from influencing the steam conveying efficiency, and the steam pipeline is suitable for discharging large-flow condensate water.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the valve field, especially relate to a drain valve. The utility model is suitable for discharging large flow condensate steam pipeline. BACKGROUND

[0002] Drain valve is used for engine group high temperature steam pipeline, and when starting, it is the valve that removes condensate in pipeline and prevents steam leakage. Such as the announcement number CN218378945U lever ball float type drain valve, the valve body is formed valve chamber and drainage chamber through the baffle, the inlet is arranged on the valve chamber, the water outlet is arranged on the drainage chamber, the membrane box exhaust valve is fixedly installed above the baffle, the drainage valve core is fixedly installed below the baffle, the valve plate that is rotatably arranged to open or close the valve core is arranged on the drainage valve core, the connecting rod is fixedly connected to the valve plate, the float ball is fixedly connected to the other end of the connecting rod, when the generator set starts, the condensate enters the valve chamber, the float ball floats and opens the drainage valve to discharge condensate, along with the discharge of condensate in the valve chamber, the float ball falls and closes the drainage valve, and normal steam conveying is realized. Its main defect is that in the steam pipeline with large condensate discharge capacity, the condensate cannot be discharged rapidly, which hinders normal steam conveying. CONTENT

[0003] The utility model provides a cock type large discharge capacity drain valve that can discharge condensate in stages, discharges condensate rapidly and ensures normal steam conveying in view of the defects in the prior art.

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

[0005] A cock type large discharge capacity drain valve, which comprises a valve body, a valve cover, a plug body, a valve rod and a handle, the valve body is provided with an inlet and an outlet, the inlet is connected to a water inlet pipe, and the outlet is connected to a drain pipe, the plug body is sealingly installed in the valve chamber by the valve cover, the lower end of the valve rod is fixedly connected to the upper end surface of the plug body, and the upper end is fixedly connected to the handle, characterized in that: the plug body is provided with a discharge passage connecting the inlet and the outlet, the inlet passage and the outlet passage are arranged at the radially symmetrical positions of the inlet and the outlet of the valve body, the plug body is provided with upper and lower through holes connecting the inlet and the inlet passage and the outlet and the outlet passage, and a drainage steam blocking valve is arranged between the inlet passage and the outlet passage.

[0006] In the above technical solution, a lower boss is provided at the center of the lower end face of the plug body, and a conical hole is provided at the center of the bottom of the valve cavity of the valve body. A ball bearing is installed between the lower boss and the conical hole. An axial limiting device is provided between the upper end face of the plug body and the valve cover. The axial limiting device is composed of a plane bearing that is pressed and installed between the limiting step on the upper end face of the plug body and the lower end face of the valve cover.

[0007] In the above technical solution, valve seats are respectively installed in the inlet, outlet, inlet channel, and outlet channel, and the sealing surface of the valve seat and the outer cylindrical surface of the plug body cooperate with each other to form a sealing pair.

[0008] In the above technical solutions, a filter is installed inside the inlet cavity outside the secondary valve seat, secondary valve core, and temperature sensor.

[0009] The advantages of this invention compared to the prior art are as follows: The plug body is provided with a discharge channel, an upper through hole, and a lower through hole. In the initial stage, rotating the handle connects the discharge channel of the plug body to the inlet and outlet, allowing the condensate to be discharged quickly. Then, rotating the handle connects the upper through hole and the lower through hole of the plug body to the inlet and outlet, allowing the medium to discharge the condensate through the drain steam valve, blocking steam leakage, achieving rapid discharge of condensate, and avoiding the condensate from affecting the steam transport efficiency. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model.

[0011] Figure 2 This is a utility model Figure 1 A schematic diagram of the structure of the middle rotary plug.

[0012] In the diagram: 1 Valve body, 2 Screw plug, 3 Plug body, 4 Valve seat, 5 Filter screen, 6 Temperature sensor, 7 Secondary valve cover, 8 Valve cover, 9 Packing, 10 Pressure ring, 11 Pressure cap, 12 Inlet chamber, 13 Secondary valve core, 14 Secondary valve body, 15 Outlet chamber, 16 Handle, 17 Valve stem, 18 Limit step, 19 Surface bearing, 20 Lower boss, 21 Ball bearing, 22 Inlet water pipe, 23 Drain pipe, 24 Inlet, 25 Outlet, 26 Outlet channel, 27 Inlet channel, 28 Discharge channel, 29 Upper through hole, 30 Lower through hole. Detailed Implementation

[0013] like Figure 1The large-capacity plug-type steam trap shown includes a valve body 1, a valve cover 8, a plug body 3, a valve stem 17, and a handle 16. The valve body 1 has an inlet 24 and an outlet 25. The inlet 24 is connected to an inlet pipe 22, and the outlet 25 is connected to a drain pipe 23. The plug body 3 is sealed and installed in the valve cavity by the valve cover 8. The lower end of the valve stem 17 is fixedly connected to the upper end face of the plug body 3, and the upper end is fixedly connected to the handle 16. The valve stem 17 and the plug body 3 can also be an integral structure. Packing 9 is installed between the valve cover 8 and the valve stem 17. The packing 9 is pressed into the packing cavity between the valve stem 17 and the valve cover 8 by a pressure ring 10 and a pressure cap 11. Its characteristic is that the plug body 3 has a discharge channel 28 connecting the inlet 24 and the outlet 25. When the generator set is started, the two ends of the discharge channel 28 are connected to the inlet 24 and the outlet 25 by rotating the handle 16, so that... Condensate in the pipeline is rapidly discharged through the discharge channel to prevent condensate accumulation in the pipeline from affecting steam flow. An inlet channel 27 and an outlet channel 26 are radially symmetrically positioned at the inlet 24 and outlet 25 of valve body 1. Specifically, inlet channel 27 and inlet 24 are located at opposite ends of the diameter of the cylindrical bore within the valve body 1, and outlet channel 26 and outlet 25 are located at opposite ends of the diameter of the cylindrical bore within the valve body 1. The plug body 3 has an upper through-hole 29 and a lower through-hole 30 connecting inlet 24 and inlet channel 27, and outlet 25 and outlet channel 26. The upper through-hole 29 connects to both ends of inlet 24 and inlet channel 27, and the lower through-hole 30 connects to both ends of outlet 25 and outlet channel 26. The centerlines of the upper through-hole 29 and lower through-hole 30 form a 90º arc on the outer cylindrical surface of the plug body 3 with the centerlines of the radial holes at both ends of the discharge channel 28. Figure 2 As shown, by rotating the handle 16 by 90°, the discharge channel 28 and the upper through hole 29 and lower through hole 30 are switched to connect with the inlet 24 and outlet 25 respectively. A drain steam trap valve is installed between the inlet channel 27 and the outlet channel 26. The drain steam trap valve includes a secondary valve body 14, a secondary valve cover 7, and a secondary valve core 13. The secondary valve cover 7 and the secondary valve body 14 form a secondary valve chamber. The secondary valve chamber consists of an inlet chamber 12 and an outlet chamber 15. The inlet chamber 12 is connected to the inlet channel 27, and the outlet chamber 15 is connected to the outlet channel 26. A secondary valve seat is provided between the valve body and the valve body 1. The secondary valve core 13 is installed in the inlet cavity 12 on the lower end face of the secondary valve cover 7 via a temperature sensor 6. The lower end face of the secondary valve core 13 has a sealing surface that cooperates with the secondary valve seat. When the inlet cavity 12 is filled with condensate, the secondary valve core 13 and the secondary valve seat are in the open state. The condensate is discharged through the secondary valve seat, the outlet cavity 15, the outlet channel 26, the lower through hole 30, the outlet 25, and the drain pipe 23. When the condensate is discharged and steam enters the inlet cavity 12, the temperature sensor 6 expands due to high temperature, pushing the secondary valve core 13 and the secondary valve seat to seal and close, preventing steam leakage. The secondary valve body 14 and the valve body 1 can be integrally cast and machined. The outlet channel 26 is machined by drilling a hole in the secondary valve body 14. The outlet channel 26 is located at one end of the secondary valve body 14 and is fitted with bolts 2.

[0014] A lower boss 20 is arranged at the center of the lower end surface of the plug body 3, a conical hole is arranged at the center of the bottom of the valve cavity of the valve body 1, and a ball 21 is arranged between the lower boss 20 and the conical hole, so as to reduce the contact area between the lower end surface of the plug body 3 and the bottom of the valve cavity of the valve body 1 and to reduce the rotating friction force; an axial limiting device is arranged between the upper end surface of the plug body 3 and the valve cover 8, so as to limit the axial movement of the plug body 3, and the axial limiting device is composed of a limiting step 18 arranged at the upper end surface of the plug body 3 and a flat bearing 19 arranged between the limiting step 18 and the lower end surface of the valve cover 8.

[0015] Valve seats 4 are arranged in the inlet 24, the outlet 25, the inlet channel 27 and the outlet channel 26 respectively, and the sealing surfaces of the valve seats 4 and the outer cylindrical surface of the plug body 3 form a sealing pair.

[0016] A filter 5 is arranged in the inlet cavity 12 outside the auxiliary valve seat, the auxiliary valve core 13 and the temperature sensor 6, so as to prevent impurities from entering between the stainless steel elastic sheets of the temperature sensor 6 and to maintain the normal operation of the temperature sensor 6.

Claims

1. A cock type large capacity drain valve, comprising a valve body (1), a valve cover (8), a cock body (3), a valve rod (17) and a handle (16), the valve body (1) is provided with an inlet (24) and an outlet (25), the inlet (24) is connected with a water inlet pipe (22), the outlet (25) is connected with a drain pipe (23), the cock body (3) is sealingly installed in a valve cavity by the valve cover (8), the lower end of the valve rod (17) is fixedly connected with the upper end surface of the cock body (3), and the upper end is fixedly connected with the handle (16); characterized in that: The plug body (3) is provided with a discharge channel (28) connecting the inlet (24) and the outlet (25), the inlet channel (27) and the outlet channel (26) are provided at the radially symmetrical positions of the inlet (24) and the outlet (25) of the valve body (1), the upper through hole (29) and the lower through hole (30) are provided on the plug body (3) and connect the inlet (24) and the inlet channel (27) and the outlet (25) and the outlet channel (26), and the drain steam valve is arranged between the inlet channel (27) and the outlet channel (26); the drain steam valve comprises a secondary valve body (14), a secondary valve cover (7) and a secondary valve core (13), the secondary valve cover (7) and the secondary valve body (14) form a secondary valve cavity, the secondary valve cavity is composed of an inlet cavity (12) and an outlet cavity (15), the inlet cavity (12) is communicated with the inlet channel (27), the outlet cavity (15) is communicated with the outlet channel (26), a secondary valve seat is arranged between the inlet cavity (12) and the outlet cavity (15), the secondary valve core (13) is installed in the inlet cavity (12) of the lower end surface of the secondary valve cover (7) through the temperature sensor (6), the lower end surface is provided with a sealing surface matched with the secondary valve seat, and when the steam enters the inlet cavity (12), the temperature sensor (6) is elastically expanded to push the secondary valve core (13) to be sealingly matched with the secondary valve seat. ​ 2. The plug-type high-capacity steam trap according to claim 1, characterized by: The lower end surface of the plug body (3) is provided with a lower boss (20) at the center, a conical hole is arranged at the center of the bottom of the valve cavity of the valve body (1), and the ball (21) is installed between the lower boss (20) and the conical hole; the axial limiting device is arranged between the upper end surface of the plug body (3) and the valve cover (8), and the axial limiting device is composed of the flat bearing (19) installed between the limiting step (18) of the upper end surface of the plug body (3) and the lower end surface of the valve cover (8).

3. The plug-type high-capacity steam trap according to claim 1 or 2, characterized in that: Valve seats (4) are arranged in the inlet (24), the outlet (25), the inlet channel (27) and the outlet channel (26), respectively, and the sealing surface of the valve seat (4) and the outer cylindrical surface of the plug body (3) are matched to form a sealing pair.

4. The plug-type high-capacity steam trap according to claim 3, characterized in that: A filter (5) is arranged in the inlet cavity (12) outside the secondary valve seat, the secondary valve core (13) and the temperature sensor (6).

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