Negative pressure balancing valve

Abstract

The utility model discloses a negative pressure balancing valve which comprises a valve body, the valve body is provided with an inner cavity, a steam inlet channel and a steam outlet channel, the valve body is provided with a first steam port and a second steam port which are communicated with the inner cavity, a steam outlet of the steam inlet channel is communicated with the inner cavity through the first steam port, and a steam inlet of the steam outlet channel is communicated with the inner cavity through the second steam port. The valve is characterized in that an atmosphere channel and a movable sealing piece are further arranged on the valve body, a third steam opening communicated with the inner cavity is formed in the valve body, and an air outlet of the atmosphere channel is communicated with the inner cavity through the third steam opening; the movable sealing piece is movably arranged in the inner cavity, and the movable sealing piece corresponds to the third steam opening in position. The negative pressure balancing valve is simple in structure, low in manufacturing cost and capable of automatically balancing air pressure inside and outside a pipeline when heating is stopped or steam is interrupted, and solution back suction is avoided.

Description

Technical Field

[0001] The utility model relates to the field of valves, in particular to a negative pressure balancing valve. Background Art

[0002] For equipment that uses steam to directly heat the solution, when the heating stops or the steam is interrupted, the steam pipeline generates negative pressure due to cooling, which will suck the solution back into the steam pipeline and the supporting facilities of the steam pipeline. At this time, the acidic and alkaline solutions will corrode the steam pipeline and the supporting facilities of the pipeline. Therefore, the current equipment will install a balancing valve in the steam pipeline to adjust the equipment pressure. For example, a pneumatic balancing valve disclosed with the publication number CN101943286A and the publication date of January 12, 2011 includes a valve core and a valve body, wherein the pneumatic balancing valve also includes a pressure regulating chamber and an equipment pressure feedback chamber, a first valve core top plate is provided in the pressure regulating chamber, a second valve core top plate is provided in the equipment pressure feedback chamber, the two ends of the radial hole of the valve core are respectively connected to the air inlet and the air outlet, and the two ends of the axial hole of the valve core are respectively connected to the first valve core top plate and the second valve core top plate. By providing the pressure regulating chamber and the equipment pressure feedback chamber, the pneumatic balancing valve can automatically adjust the air source control valve when the equipment pressure changes. However, this type of balancing valve has a complex structure and high manufacturing cost. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a negative pressure balancing valve, which has a simple structure and low manufacturing cost and can automatically balance the air pressure inside and outside the pipeline when heating stops or steam is interrupted to avoid solution back suction.

[0004] In order to solve the above technical problems, the technical solutions adopted are as follows:

[0005] A negative pressure equalizing valve comprises a valve body, the valve body is provided with an inner cavity, a steam inlet channel and a steam outlet channel, a first steam port and a second steam port connected to the inner cavity are opened on the valve body, the steam outlet of the steam inlet channel is connected to the inner cavity through the first steam port, and the steam inlet of the steam outlet channel is connected to the inner cavity through the second steam port. It is characterized in that: the valve body is also provided with an atmospheric channel and a movable sealing component, the valve body is provided with a third steam port connected to the inner cavity, and the air outlet of the atmospheric channel is connected to the inner cavity through the third steam port; the movable sealing component is movably arranged in the inner cavity, and the movable sealing component corresponds to the position of the third steam port.

[0006] When in use, the negative pressure equalizing valve is connected between the steam pipeline and the equipment heated by steam, and the steam inlet channel of the valve body is connected to the steam outlet of the steam pipeline, and the steam outlet channel of the valve body is connected to the equipment heated by steam. When steam is heated and produced normally, the steam sent from the steam pipeline enters the inner cavity from the steam inlet channel of the valve body, and then flows out from the steam outlet channel to the equipment heated by steam. At this time, the pressure in the inner cavity is greater than the external pressure. The movable seal seals the outlet of the atmosphere channel under the action of the internal steam pressure, and the steam will not leak out, and the production can proceed normally; when the heating stops or the steam is interrupted, the steam pipeline will generate negative pressure due to cooling or steam stopping. At this time, the movable seal is lifted up and moves along the inner cavity under the action of the external atmospheric pressure, and the outlet of the atmosphere channel is no longer sealed. The external atmosphere can enter the steam pipeline from the inner cavity of the valve body through the atmospheric channel, so that the air pressure inside and outside the pipeline is balanced, and the solution is prevented from being sucked back into the equipment to cause corrosion.

[0007] In a preferred embodiment, the movable seal comprises a movable pressing plate and a sealing gasket, wherein the movable pressing plate is movably arranged in the inner cavity, and the movable pressing plate has a shielding portion corresponding to the position of the air outlet of the atmosphere channel; the sealing gasket matches the shape of the movable pressing plate, the sealing gasket fits tightly with the movable pressing plate, and the sealing gasket is located between the movable pressing plate and the air outlet of the atmosphere channel, and the sealing gasket is provided with a through hole corresponding to the position of the air outlet of the atmosphere channel, and the size of the through hole is smaller than the shielding portion. The shielding portion of the movable pressing plate can shield the air outlet of the atmosphere channel during normal steam heating production, and the sealing gasket can prevent steam leakage.

[0008] In a further preferred embodiment, the third steam port is opened at the bottom of the valve body, and the movable seal is located directly above the third steam port. With this arrangement, the movable seal sticks to the bottom of the valve body under the action of gravity and covers the third steam port, and when steam is heated normally, the movable seal sticks to the bottom of the valve body under the combined action of internal steam pressure and gravity and seals the third steam port.

[0009] In a further preferred embodiment, the valve body is cylindrical, and the third steam port is opened in the middle position on the lower end surface of the valve body; the movable pressing plate includes the shielding portion and a plurality of first extension portions, each of which extends outward from the edge of the shielding portion and is evenly distributed along the circumference of the shielding portion, and the outer end of each first extension portion is in contact with the inner wall of the valve body. With this arrangement, the movable seal can move up and down along the valve body, and during the movement, the movable seal will not flip over; when the movable seal moves upward, the outside atmosphere can enter the valve body through the gap formed between the shielding portion and each first extension portion. In a further preferred embodiment, the first steam port and the second steam port are respectively opened on the upper end surface or side surface of the valve body.

[0010] The valve body, steam inlet channel, steam outlet channel and atmosphere channel can be made of polypropylene.

[0011] The negative pressure equalizing valve of the utility model is closed during normal steam heating production to prevent steam leakage; when heating stops or steam is interrupted, it can automatically balance the air pressure inside and outside the pipeline to avoid solution back-absorption. Moreover, the negative pressure equalizing valve of the utility model has a simple structure and a low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a cross-sectional view of the negative pressure equalizing valve in the embodiment of the utility model;

[0013] Figure 2 A top view of the movable pressing sheet in the embodiment of the utility model;

[0014] Figure 3 It is a top view of the sealing gasket in the embodiment of the utility model. Implementation

[0015] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments:

[0016] like Figure 1-3 A negative pressure equalizing valve shown in the figure includes a valve body 1, which is provided with an inner cavity 101, a steam inlet channel 102, a steam outlet channel 103, an atmosphere channel 104 and a movable seal 105. The valve body 1 is provided with a first steam port, a second steam port and a third steam port connected to the inner cavity 101. The steam outlet of the steam inlet channel 102 is connected to the inner cavity 101 through the first steam port, the steam inlet of the steam outlet channel 103 is connected to the inner cavity 101 through the second steam port, and the air outlet of the atmosphere channel 104 is connected to the inner cavity 101 through the third steam port; the movable seal 105 is movably arranged in the inner cavity 101, and the movable seal 105 corresponds to the position of the third steam port.

[0017] When in use, the negative pressure equalizing valve is connected between the steam pipeline and the device heated by steam, the steam inlet channel 102 of the valve body 1 is connected to the steam outlet of the steam pipeline, and the steam outlet channel 103 of the valve body 1 is connected to the device heated by steam. When steam is heated normally for production, the steam sent from the steam pipe enters the inner cavity 101 from the steam inlet channel 102 of the valve body 1, and then flows out from the steam outlet channel 103 to the equipment that uses steam for heating. At this time, the pressure in the inner cavity 101 is greater than the external pressure. The movable seal 105 seals the air outlet of the atmosphere channel 104 under the action of the internal steam pressure, and the steam will not leak out, so that the production can proceed normally; when the heating stops or the steam is interrupted, the steam pipe will generate negative pressure due to cooling or steam stop. At this time, the movable seal 105 is lifted up and moves along the inner cavity 101 under the action of the external atmospheric pressure, and the air outlet of the atmosphere channel 104 is no longer sealed. The outside atmosphere can enter the steam pipe from the inner cavity 101 of the valve body 1 through the atmospheric channel 104, so that the air pressure inside and outside the pipe is balanced, avoiding the solution from being sucked back into the equipment to cause corrosion.

[0018] The movable sealing member 105 comprises a movable pressing plate 1051 and a sealing gasket 1052. The movable pressing plate 1051 is movably arranged in the inner cavity 101, and the movable pressing plate 1051 has a shielding portion 10511 corresponding to the position of the air outlet of the atmosphere channel 104; the sealing gasket 1052 matches the shape of the movable pressing plate 1051, and the sealing gasket 1052 is tightly fitted with the movable pressing plate 1051, and the sealing gasket 1052 is located between the movable pressing plate 1051 and the air outlet of the atmosphere channel 104, and a through hole 10521 corresponding to the position of the air outlet of the atmosphere channel 104 is opened on the sealing gasket 1052, and the size of the through hole 10521 is smaller than the shielding portion 10511. The shielding portion 10511 of the movable pressing plate 1051 can shield the air outlet of the atmosphere channel 104 when steam is heated normally for production, and the sealing gasket 1052 can prevent steam leakage.

[0019] The third steam port is opened at the bottom of the valve body 1, and the movable seal 105 is located directly above the third steam port. With this arrangement, the movable seal 105 sticks to the bottom of the valve body 1 under the action of gravity and covers the third steam port, and when steam is heated and produced normally, the movable seal 105 sticks to the bottom of the valve body 1 under the combined action of internal steam pressure and gravity and seals the third steam port.

[0020] The valve body 1 is cylindrical, and the third steam port is opened in the middle position of the lower end surface of the valve body 1; the movable pressing plate 1051 includes a shielding portion 10511 and a plurality of first extension portions 10512, each of which extends outward from the edge of the shielding portion 10511 and is evenly distributed along the circumference of the shielding portion 10511, and the outer end of each first extension portion 10512 is in contact with the inner side wall of the valve body 1. Through this arrangement, the movable seal 105 can move up and down along the valve body 1, and during the movement, the movable seal 105 will not turn over; when the movable seal 105 moves upward, the outside atmosphere can enter the valve body 1 through the gap formed between the shielding portion 10511 and each of the first extension portions 10512. The first steam port and the second steam port are respectively opened on the upper end surface of the valve body 1.

[0021] The valve body 1, the steam inlet channel 102, the steam outlet channel 103 and the atmosphere channel 104 are all made of polypropylene.

Claims

1. A negative pressure equalizing valve, comprising a valve body, the valve body being provided with an inner cavity, a steam inlet channel and a steam outlet channel, the valve body being provided with a first steam port and a second steam port communicating with the inner cavity, the steam outlet of the steam inlet channel being communicated with the inner cavity through the first steam port, the steam inlet of the steam outlet channel being communicated with the inner cavity through the second steam port, characterized in that: The valve body is also provided with an atmospheric passage and a movable seal. The valve body is provided with a third steam port connected to the inner cavity. The air outlet of the atmospheric passage is connected to the inner cavity through the third steam port. The movable seal is movably arranged in the inner cavity, and the movable seal corresponds to the position of the third steam port.

2. A negative pressure equalizing valve according to claim 1, characterized in that: The movable sealing member includes a movable pressing plate and a sealing gasket. The movable pressing plate is movably arranged in the inner cavity, and the movable pressing plate has a shielding portion corresponding to the position of the air outlet of the atmospheric channel; the sealing gasket matches the shape of the movable pressing plate, the sealing gasket fits tightly with the movable pressing plate, and the sealing gasket is located between the movable pressing plate and the air outlet of the atmospheric channel, and a through hole corresponding to the position of the air outlet of the atmospheric channel is opened on the sealing gasket, and the size of the through hole is smaller than the shielding portion.

3. A negative pressure equalizing valve according to claim 2, characterized in that: The third steam port is opened at the bottom of the valve body, and the movable sealing component is located just above the third steam port.

4. A negative pressure equalizing valve according to claim 3, characterized in that: The valve body is cylindrical, and the third steam port is opened in the middle position of the lower end surface of the valve body; the movable pressing plate includes the shielding portion and multiple first extension portions, each of the first extension portions extends outward from the edge of the shielding portion and is evenly distributed along the circumference of the shielding portion, and the outer end portion of each first extension portion is in contact with the inner side wall of the valve body respectively.

5. A negative pressure equalizing valve according to claim 4, characterized in that: The first steam port and the second steam port are respectively opened on the upper end surface or the side surface of the valve body.

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