Energy-saving type preheating air seal horizontal pushing valve

Abstract

A valve shell is provided with an inner cavity, a gas flow channel is formed in the position, beside a gas port, of a valve seat, a driving mechanism is arranged on the valve shell and extends into the inner cavity, and a valve plate is arranged at the output end of the driving mechanism. The sealing assembly comprises a support of an annular structure and a sealing ring located on the outer side of the support, when the valve plate is driven to move downwards to abut against the sealing assembly together with the valve seat, a gas cavity communicated with the gas flow channel is formed between the support and the sealing ring, and at least part of the gas heating pipeline is wound around the valve shell and communicated with the gas flow channel. The gas heating pipeline preheats gas seal gas and preheats the gas seal gas to the temperature of the valve in the gas flow channel, so that the gas seal gas and the valve are at the same temperature, the sealing effect is good, condensation cannot be formed on the sealing face of the valve plate and the valve seat, namely the periphery of the support due to temperature difference, corrosion of the support can be avoided, and project investment, occupied space and energy consumption can be saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve device technical field especially relates to a kind of energy-saving preheating gas seal flat slide valve. BACKGROUND

[0002] The heat accumulating incinerator has the characteristics of high-efficiency combustion, is reliable and is widely used in the organic waste gas treatment industry. The incinerator adopts the heat accumulator to accumulate heat and reversely preheat the organic waste gas to be treated, and the air flow direction needs to be frequently switched. The valve provided needs to have simple and reliable structure and low leakage rate. The traditional heat accumulating incinerator is provided with a flat slide valve or a gas seal valve. The flat slide valve has a single sealing surface and has ordinary sealing effect, and cannot be used in a high-efficiency incinerator system. The gas seal valve has double sealing surfaces, and a sealing gas channel is arranged between the sealing surfaces. After high-pressure gas is introduced into the sealing gas channel, the high-pressure gas is blown to the two sealing surfaces to avoid that the low-pressure waste gas is directly leaked to the outlet side of the valve without being treated.

[0003] After the incineration, the temperature of the waste gas of the incinerator usually fluctuates in the range of 60-120℃, and the temperature of the valve also fluctuates with the temperature of the waste gas. In a system containing corrosive waste gas, if a normal-temperature sealing gas is used, the corrosive medium in the untreated waste gas on the inlet side of the valve will be condensed due to the cooling of the sealing surface of the valve, and the condensed corrosive medium will accelerate the corrosion of the valve after contacting the valve. If a high-temperature sealing gas is used, the existing technology generally provides an external heating device to heat and treat the sealing gas. However, the external heating device increases the cost of the system, increases the land occupation of the system, and increases the energy consumption, which is not conducive to energy saving and emission reduction. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims to provide an energy-saving preheating gas seal flat slide valve. The gas heating pipeline preheats the sealing gas and preheats the sealing gas to the temperature of the valve in the gas flow channel, so that the sealing gas has the same temperature as the valve, the sealing effect is good, and condensation is not formed around the sealing surface of the valve plate and the valve seat, i.e. the bracket, due to the temperature difference. The bracket corrosion can be avoided, the project investment, land occupation and energy consumption can be saved.

[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme that an energy-saving preheating gas seal flat slide valve comprises:

[0006] A valve housing has an inner cavity, and a gas port communicating with the inner cavity is arranged on the valve seat of the valve housing. A gas flow channel is arranged on the valve seat on the side of the gas port,

[0007] A driving mechanism is arranged on the valve housing and extends into the inner cavity,

[0008] A valve plate is arranged on the output end of the driving mechanism and is used to open or close the gas port,

[0009] A sealing assembly includes a ring-shaped support and a sealing ring located outside the support. The support and sealing ring are disposed on the valve seat or valve plate. When the valve plate is driven to move downward and abuts against the sealing assembly together with the valve seat, a gas cavity communicating with the gas flow channel is formed between the support and the sealing ring.

[0010] A gas heating pipe, at least partially wrapped around the valve housing and connected to the gas flow channel.

[0011] As a further optimization, the bracket and the sealing ring are both disposed on the valve seat, and are located on the inner and outer sides of the gas flow channel, respectively.

[0012] As a further optimization, the vertical cross-section of the support is a trapezoidal structure.

[0013] As a further optimization, the valve seat includes a lower plate and an upper plate welded together. The lower plate is provided with an annular groove, and the upper plate is provided with a vent hole. The lower end of the vent hole is connected to the annular groove to form the gas flow channel, and the upper end of the vent hole is connected to the gas chamber.

[0014] As a further optimization, the gas heating pipeline includes an inlet pipe, a coil, and multiple branch pipes connected in sequence. The coil is attached to the valve body, and the branch pipes are connected to the gas flow channel. The coil realizes the heat conduction and heating of the sealing gas by the valve body.

[0015] As a further optimization, an insulation layer is provided on the side of the coil away from the valve housing and on the branch pipe to maintain the temperature of the preheated gas seal gas.

[0016] As a further optimization, the gas heating pipeline is equipped with a pressure regulating valve and a shut-off valve, which can adjust the gas sealing gas pressure.

[0017] As a further optimization, a pressure sensor is provided on the valve body to monitor the pressure inside the valve body in real time. For example, two pressure sensors can be used to monitor the pressure on the valve inlet and outlet sides respectively.

[0018] As a further optimization, the drive mechanism includes a drive cylinder and a shaft disposed at the output end of the drive cylinder, the shaft extending into the inner cavity and connecting to the valve plate.

[0019] As a further optimization, a bushing is provided on the valve body, and the shaft extends into the bushing to ensure the stability and accuracy of the vertical movement of the shaft and the valve.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The gas heating pipeline preheats the gas sealing gas and preheats it to the valve temperature in the gas flow channel, so that the gas sealing gas and the valve are at the same temperature. Under the premise of excellent sealing effect, condensation will not form around the sealing surface of the valve plate and valve seat, i.e. the support, due to the temperature difference between the gas sealing gas and the valve, thus avoiding corrosion of the support.

[0022] 2. The heat from the waste gas is used to heat the gas seal gas through gas heating pipes and valve seats, which greatly saves project investment, land area and energy consumption. Attached Figure Description

[0023] Figure 1 This is a structural diagram of the present invention.

[0024] Figure 2 This is a cross-sectional view of the present invention.

[0025] Figure 3 for Figure 2 Enlarged view of point A in the middle. Detailed Implementation

[0026] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0027] like Figures 1 to 3 As shown, an energy-saving preheating gas-sealed push valve includes a valve housing 10, a drive mechanism 20, a valve plate 30, a sealing assembly, and a gas heating pipe 40. The valve housing 10 has an inner cavity 100, and its valve seat 11 is provided with a gas port 101 communicating with the inner cavity 100. A gas flow channel 110 is provided on the valve seat 11 next to the gas port 101. The drive mechanism 20 is disposed on the valve housing 10 and extends into the inner cavity 100. The valve plate 30 is disposed at the output end of the drive mechanism 20 for opening or closing the gas port 101. The sealing assembly includes a ring-shaped bracket 121 and a sealing ring 122 located outside the bracket 121. The bracket 121 and the sealing ring 122 are disposed on the valve housing 10. On the valve seat 11 or valve plate 30, the bracket 121 is made of metal and the sealing ring 122 is made of soft material. Preferably, both the bracket 121 and the sealing ring 122 are disposed on the valve seat 11 and are located on the inner and outer sides of the gas flow channel 110, respectively. When the valve plate 30 is driven down by the drive mechanism 20 and abuts against the sealing assembly together with the valve seat 11, the lower end face of the valve plate 30 abuts against the upper end face of the bracket 121 and the upper end face of the sealing ring 122 located on the valve seat 11. A gas cavity 1000 communicating with the gas flow channel 110 is formed between the bracket 121 and the sealing ring 122. The gas heating pipe 40 is at least partially wrapped around the valve body 10 and communicates with the gas flow channel 110.

[0028] In this invention, since the bracket 121 and the sealing ring 122 are mounted on the valve seat 11, after the driving mechanism 20 drives the valve plate 30 to move downward, the lower end face of the valve plate 30 abuts against the upper end face of the bracket 121 and the sealing ring 122, thus forming a gas cavity 1000 for accommodating the gas sealing gas. When this energy-saving preheating gas sealing push valve is working, the external gas used to form the gas sealing gas enters from the gas heating pipe 40. The gas heating pipe 40 heats the gas sealing gas through heat conduction with the valve body 10, so that the temperature of the gas sealing gas can gradually rise within the gas heating pipe 40. After the gas sealing gas is preheated and heated, it enters the gas flow channel 110 on the valve seat 11, where it can be heated again through heat conduction by the valve seat 11 to the same temperature as the inner cavity 100 and the gas port 101.

[0029] The gas sealing gas of this invention is initially preheated in the gas heating pipe 40 and further preheated to the valve temperature in the gas flow channel 110, so that the gas sealing gas and the valve are at the same temperature. The gas sealing gas has excellent sealing effect and will not cause condensation around the sealing surface (support 121) of the valve plate 30 and the valve seat 11 due to the temperature difference between the gas sealing gas and the valve. In particular, the support 121 is made of metal, which can avoid corrosion.

[0030] The vertical cross-section of the preferred support 121 is a trapezoidal structure, such as an isosceles trapezoidal structure, which can have better structural strength and facilitate the formation of abutment against the valve plate 30.

[0031] Furthermore, the valve seat 11 includes a lower plate 111 and an upper plate 112 welded together. The lower plate 111 is provided with an annular groove 1110. After the gas sealing gas preheated by the gas heating pipe 40 flows in the annular groove 1110, it can fully conduct heat with the valve seat 11 and continue to heat up. The upper plate 112 is provided with a vent 1120. The lower end of the vent 1120 is connected to the annular groove 1110 to form a gas flow channel 110. The upper end of the vent 1120 is connected to the gas chamber 1000. The vent 1120 can guide the heated gas sealing gas in the annular groove 1110 into the gas chamber 1000. The vent 1120 has multiple vents arranged at intervals to ensure that the gas sealing gas has a longer time and a longer path to flow in the annular groove 1110, which can more effectively realize the heat conduction between the gas sealing gas and the valve seat 11.

[0032] The specific structure of the gas heating pipe 40 includes an inlet pipe 41, a coil 42, and multiple branch pipes 43 connected in sequence. The coil 42 is attached to the valve body 10, and the branch pipes 43 are connected to the gas flow channel 110. Preferably, the inlet pipe 41 is connected to the lower end of the coil 42, and the upper end of the branch pipe 43 is connected to the upper end of the coil 42. After being bent, the lower end of the branch pipe 43 is connected to the gas flow channel 110. The sealing gas enters through the inlet pipe 41 and gradually heats up by conducting heat with the outer wall of the valve body 10 during the spiral ascent in the coil 42. The gas is then sent to multiple different positions in the gas flow channel 110 by the multiple branch pipes 43 to achieve temperature uniformity.

[0033] Preferably, the side of the coil 42 away from the valve housing 10 and the branch pipe 43 are provided with a heat insulation layer, which can prevent heat loss caused by heat conduction between the preheated gas seal gas and the external environment.

[0034] In addition, the gas heating pipe 40 is equipped with a shut-off valve 441 and a pressure regulating valve 442, which are preferably located at the connection between the coil 42 and the branch pipe 43, so as to realize the on / off of the gas sealing gas and the adjustment of the pressure.

[0035] Furthermore, the valve body 10 is equipped with pressure sensors, such as an upper chamber pressure sensor 51 and a lower chamber pressure sensor 52, which are used to monitor the pressure on the valve inlet side and the pressure on the outlet side, respectively. The two pressure sensors monitor the pressure and transmit it to the control system. They can cooperate with the shut-off valve 441 and / or the pressure regulating valve 442. Specifically, the control system sends a signal to the pressure regulating valve 442 based on the two pressure values ​​monitored by the upper chamber pressure sensor 51 and the lower chamber pressure sensor 52, to ensure that the gas sealing pressure is always greater than the valve inlet and outlet pressures. The gas pressure in the gas chamber 1000 is higher than the pressure inside the bracket 121 and outside the sealing ring 122, so that the low-pressure gas on the inlet side cannot pass through the sealing ring 122, the gas chamber 1000 and the bracket 121 to reach the outlet side, thus achieving zero leakage of VOCs at the inlet.

[0036] In this utility model, the drive mechanism 20 specifically includes a drive cylinder 21 and a shaft 22 disposed at the output end of the drive cylinder 21. The shaft 22 is connected to the drive cylinder 21 through a coupling 211, and the shaft 22 extends into the inner cavity 100 to connect to the valve plate 30.

[0037] To ensure the stability and accuracy of the valve plate 30 moving up and down driven by the shaft 22, the valve body 10 is provided with bushings, namely the first bushing 231 and the second bushing 232 are respectively fitted on the upper and lower parts of the shaft 22.

[0038] This utility model is based on a simple push valve, with an air seal function added to it. The air seal function is modified so that the air seal gas is preheated by the waste heat of the exhaust gas before entering the air seal chamber, so that it reaches the same temperature as the exhaust gas and avoids condensation on the blow-off sealing surface.

[0039] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. An energy saving preheated gas seal flat slide valve characterized by, The utility model relates to a valve device, comprising: a valve housing having an inner cavity, and a valve seat provided with a gas port communicating with the inner cavity, and a gas flow channel provided on the valve seat at the side of the gas port, a driving mechanism provided on the valve housing and extending into the inner cavity, a valve plate provided on the output end of the driving mechanism for opening or closing the gas port, a sealing assembly comprising a bracket in annular structure and a sealing ring provided outside the bracket, the bracket and the sealing ring being provided on the valve seat or the valve plate, and when the valve plate is driven to move downward and abut against the sealing assembly together with the valve seat, a gas cavity is formed between the bracket and the sealing ring and communicates with the gas flow channel, a gas heating pipeline at least partially wound on the valve housing and communicating with the gas flow channel.

2. The energy saving preheating gas seal flat slide valve according to claim 1, characterized in that, The bracket and the sealing ring are both provided on the valve seat and are respectively located at the inner side and the outer side of the gas flow channel.

3. The energy saving preheating gas seal flat slide valve according to claim 1 or 2, characterized in that, The vertical section of the bracket is in trapezoidal structure.

4. The energy saving preheating gas seal flat slide valve according to claim 1 or 2, characterized in that, The valve seat comprises a lower plate and an upper plate welded together, the lower plate is provided with an annular groove, the upper plate is provided with a gas hole, the lower end of the gas hole communicates with the annular groove to form the gas flow channel, and the upper end of the gas hole communicates with the gas cavity.

5. The energy saving preheating gas seal flat slide valve according to claim 1 or 2, characterized in that, The gas heating pipeline comprises a gas inlet pipe, a coil pipe and a plurality of branch pipes connected in sequence, the coil pipe is attached to the valve housing, and the branch pipes communicate with the gas flow channel.

6. The energy saving preheat gas seal piston valve according to claim 5, wherein, The coil pipe is provided with a heat preservation layer on the side away from the valve housing, and the branch pipes are also provided with a heat preservation layer.

7. The energy saving preheat gas seal piston valve according to claim 5, wherein, The gas heating pipeline is provided with a pressure regulating valve and a shut-off valve.

8. The energy saving preheat gas seal piston valve according to claim 7, wherein, The valve housing is provided with a pressure sensor.

9. The energy saving preheat gas seal piston valve according to claim 1, wherein, The driving mechanism comprises a driving cylinder and a shaft provided on the output end of the driving cylinder, the shaft extends into the inner cavity and connects the valve plate.

10. The energy saving preheat gas seal piston valve according to claim 9, wherein, The valve housing is provided with a shaft sleeve, and the shaft extends into the shaft sleeve.

Images