CN205136674U - Three -way change valve - Google Patents

Abstract

The utility model discloses a three-way reversing valve, which belongs to the technical field of valves and comprises a valve body and a cylinder. The valve body has a first chamber, a second chamber and a third chamber; There is a first communication port, a second communication port between the third chamber and the second chamber, a valve plate is provided between the first communication port and the second communication port, the upper and lower sides of the valve plate are provided with sealing gaskets, and one side of the valve plate A bag groove is arranged on the top, and the head of the piston rod of the cylinder is provided with a spherical expander, which is located in the bag groove, and the diameter of the bag groove is smaller than the diameter of the spherical expander. The device has tight sealing, high safety and is very practical.

Description

A three-way reversing valve

technical field

The utility model relates to the technical field of valves, in particular to a three-way reversing valve.

Background technique

A three-way reversing valve is required in the heating furnace equipment, and the three-way reversing valve is used to switch the flow of gas and waste gas. Specifically, when the three-way reversing valve is in the first state, the gas pipe is connected to the main pipe, the waste gas pipe is closed, and the gas flows along the direction from the main pipe to the gas pipe; when the three-way reversing valve is in the second state, The waste gas pipe is communicated with the main pipe, the gas pipe is closed, and the waste gas flows along the direction from the waste gas pipe to the main pipe.

In the prior art, this three-way reversing valve uses a valve plate to block the gas pipe or waste gas pipe, and the valve plate controls the movement through the cylinder. However, in actual use, it often occurs that the cylinder and the three-way reversing valve are not on the same centerline, which causes the valve plate to not seal the gas pipe or exhaust pipe tightly, resulting in gas leakage, gas leakage, and potential safety hazards.

Utility model content

The technical problem to be solved by the utility model is to provide a three-way reversing valve for the above-mentioned deficiencies in the prior art. Even if the directional valve is not on a central line, it can ensure the complete sealing of the valve plate to the communication port, so that it has the effect of tight sealing and high safety, which is very practical.

In order to solve the problems of the technologies described above, the technical solution adopted by the utility model is:

A three-way reversing valve, which includes a valve body and a cylinder, the valve body has a first chamber for connecting a gas pipe, a second chamber for connecting a main pipe, and a third chamber for connecting a waste gas pipe; the first There is a first communication port between the chamber and the second chamber, a second communication port between the third chamber and the second chamber, a valve plate is provided between the first communication port and the second communication port, and the upper and lower sides of the valve plate are It has a gasket, which is used to seal the communication port more tightly. There is a groove on one side of the valve plate, and the head of the cylinder piston rod is provided with a spherical expansion. The spherical expansion is located in the groove, and the diameter of the groove is smaller than that of the spherical expansion. diameter.

The trough can be composed of a trough body and a gland. There is an opening on the gland. The spherical expansion is located in the trough and is restricted by the gland. The piston rod passes through the opening. The opening of the gland is the opening of the trough. The diameter is smaller than that of the spherical dilation.

The gasket can be a rubber ring.

The piston rod of the cylinder can also be provided with a stopper for preventing excessive lifting of the piston rod. When the valve plate seals the first communication port, the stopper just abuts against the inner wall of the valve.

The beneficial effects produced by adopting the above-mentioned technical scheme are:

The three-way reversing valve in the prior art is usually fixedly connected with the valve plate and the piston rod in the form of threaded connection, but it is impossible to ensure that the cylinder and the three-way reversing valve are on the same center line in actual use, so the valve An included angle will be formed between the sealing plane of the plate and the opening plane of the communication port, resulting in poor sealing of the valve plate to the communication port.

The utility model connects the valve plate and the piston rod together in a movable way, and the valve plate can rotate freely around the spherical expansion, so that even if there is an included angle with the communication port, the valve plate can also rotate spontaneously under the drive of the cylinder to realize the connection with the piston rod. The communication ports are completely parallel to achieve a tight seal on the communication ports, eliminating the possibility of air leakage and improving the safety of the three-way reversing valve, which is very practical.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment;

Fig. 2 is a partially enlarged view of part A in Fig. 1 .

In the figure: 1. Valve body; 11. Gas pipe interface; 12. Main pipe interface; 121. First communication port; 122. Second communication port; 13. Waste gas pipe interface; 20. Limit stopper; 21. Valve plate ; 211, tank body; 212, gland; 3, cylinder; 31, piston rod; 311, spherical expansion.

detailed description

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

Embodiment one:

As shown in Figure 1, a three-way reversing valve includes a valve body 1 and a cylinder 3, the valve body 1 has a first chamber, a second chamber and a third chamber, the first chamber has a gas pipe interface 11, the second The cavity has a main pipe interface 12, and the third cavity has an exhaust pipe interface 13; there is a first communication port 121 between the first cavity and the second cavity, and a second communication port 122 between the third cavity and the second cavity. A valve plate 21 is provided between the port 121 and the second communication port 122. The upper and lower sides of the valve plate 21 are provided with rubber ring seals. The valve plate 21 is provided with a groove, and the head of the piston rod 31 is provided with a spherical expansion 311. The ladle is composed of a tank body 211 and a gland 212. An opening is provided on the gland 212. The spherical expansion 311 is located in the tank body 211 and is restricted by the gland 212. The piston rod 31 passes through the opening, and the diameter of the opening is smaller than that of the spherical expansion. 311 diameter, the piston rod 31 is also provided with a limit stopper 20 .

When the piston rod moves downward, the valve plate blocks the second communication port, while the first communication port is opened, and the main pipe is connected with the gas pipe; when the piston rod moves upward, the valve plate blocks the first communication port, while the second communication port is connected. The mouth is open, and the main pipe is connected with the exhaust pipe. Because the device uses a movable connection structure, the piston rod may escape from the opening of the bag groove under the action of a large force, so a limit stopper can be set on the piston rod to prevent the excessive rise of the piston rod.

The utility model connects the valve plate and the piston rod together in a movable way, and the valve plate can rotate freely around the spherical expansion, so that even if there is an included angle with the communication port, the valve plate can also rotate spontaneously under the drive of the cylinder to realize the connection with the piston rod. The communication ports are completely parallel to achieve a tight seal on the communication ports, eliminating the possibility of air leakage and improving the safety of the three-way reversing valve, which is very practical.

It should be pointed out that the above specific implementation methods are only specific examples of the implementation scheme of this patent, and they do not and cannot cover all the implementation methods of this patent, so they cannot be regarded as limiting the scope of protection of this patent; Implementation schemes are all within the protection scope of this patent.

Claims (4)

1. a three-way diverter valve, is characterized in that: comprise valve body (1) and cylinder (3), and valve body (1) has the first chamber for connecting gas pipe, for connecting second chamber of house steward, and for connecting the 3rd chamber of flue gas leading; There is between first chamber and the second chamber the first connecting port (121), there is between 3rd chamber and the second chamber the second connecting port (122), valve plate (21) is provided with between first connecting port (121) and the second connecting port (122), the upper and lower surface of valve plate (21) all has sealing gasket, the one side of valve plate (21) is provided with bag groove, the head of cylinder piston rod is provided with spherical expand (311), and spherical expand (311) are positioned at bag groove, and bag notch footpath is less than the spherical diameter expanding (311).

2. three-way diverter valve according to claim 1, is characterized in that: described bag groove is made up of cell body (211) and gland (212), and gland (212) is provided with opening, and opening diameter is less than the spherical diameter expanding (311).

3. three-way diverter valve according to claim 1, is characterized in that: described sealing gasket is rubber ring.

4. three-way diverter valve according to claim 1, it is characterized in that: the piston rod (31) of described cylinder (3) is provided with the spacing block piece (20) for preventing piston rod (31) from excessively promoting, time valve plate (21) closed first connecting port (121), spacing block piece (20) props up valve body (1) inwall just.