A back-blowing pulse valve

Abstract

The utility model discloses a back-blowing pulse valve, comprising: a valve body; a valve stem, an end of which is provided with a guide sleeve, the valve stem passes through the guide sleeve, is slidably arranged in the valve body, and a valve core is arranged on the guide sleeve; a guide support ring is arranged at a first step at the outlet of the valve body; a valve seat support ring is arranged at the end of the guide support ring; a valve seat is arranged at the valve seat support ring and a second step in the valve body; a guide body is arranged at the center of the guide support ring through a connecting rod and is supported by the end of the valve stem; a valve seat, a valve seat support ring and a guide support ring are axially arranged in sequence between the first step and the second step in the valve body, a guide body is arranged in the middle of the guide support ring, and the valve stem is supported between the guide sleeve and the guide body, so that during the reciprocating motion of the valve stem, the valve stem is always supported by the guide sleeve and the guide body, and the valve core is sealed against the valve seat, which can ensure the axial movement accuracy of the valve stem and prevent the valve stem from bending.

Description

Technical Field

[0001] The utility model relates to the field of valves, in particular to a back-blowing pulse valve. Background Art

[0002] In recent years, with the advancement of the localization of the domestic coal chemical industry, the application of domestic pulverized coal gasification equipment has gradually increased. The pulse backflush valve is an important device in the online backflush cleaning system of the ceramic high-temperature and high-pressure fly ash filter element in the Shell pulverized coal gasification device. It is used to control the pressure drop of the fly ash filter element after backflush cleaning to be lower than the maximum value of 4kPa (normally 2kPa), to prevent damage and failure of the filter element, and to ensure the normal operation of the coal gasification process system; the valve is frequently switched, directly in contact with the high-temperature and high-pressure crude synthesis gas, and requires the generation of pulsed airflow under high pressure difference conditions, which leads to the bending of the valve stem due to corrosion impact, resulting in unstable equipment operation;

[0003] In summary, how to improve the stability of the valve stem has become an urgent problem that researchers in this field need to solve. Utility Model Content

[0004] The technical problem to be solved by the utility model is: how to improve the stability of the valve stem;

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] The utility model is a back-blowing pulse valve, comprising: a valve body; a valve stem, a guide sleeve is arranged at the end thereof, the valve stem passes through the guide sleeve, is slidably arranged in the valve body, and a valve core is arranged on the guide sleeve; a guide support ring is arranged at a first step at the outlet of the valve body; a valve seat support ring is arranged at the end of the guide support ring; a valve seat is arranged at the valve seat support ring and at a second step in the valve body; a guide body is arranged at the center of the guide support ring through a connecting rod and is supported by the end of the valve stem;

[0007] In this solution, a valve seat, a valve seat support ring, and a guide support ring are axially arranged between the first step and the second step in the valve body in sequence. A guide body is arranged in the middle of the guide support ring, and the valve stem is supported between the guide sleeve and the guide body. In this way, the valve stem is always supported by the guide sleeve and the guide body during the reciprocating motion of the valve stem, and the valve core and the valve seat are abutted against each other for sealing, which can ensure the axial movement accuracy of the valve stem and prevent the valve stem from bending.

[0008] In order to increase the service life of the guide body, the utility model adopts a guide sleeve made of polyethylamide provided in the guide body;

[0009] The guide sleeve made of polyamide is not easily worn, ensuring the centering and stability of the valve stem.

[0010] In order to ensure that the valve stem will not be corroded, the utility model adopts a bellows, which is sleeved outside the valve stem, one end of which is fixed to the valve stem, and the other end is fixedly connected to the guide sleeve;

[0011] The bellows sleeve is fixed outside the valve stem. On the one hand, it prevents the leakage of inlet and outlet gases, that is, the bellows plays a sealing role after compression. On the other hand, it protects most of the valve stem, eliminates the erosion and corrosion of high-pressure crude synthesis gas, and effectively extends the service life of the valve stem.

[0012] In order to ensure the sealing of the valve body, valve core and valve seat, the utility model adopts a slope extending obliquely downward from the center of the top surface of the valve seat toward the inner diameter of the valve seat, and the angle between the slope and the horizontal plane is 15°. The top surface of the valve seat and an annular groove are opened on the outside of the slope.

[0013] In this solution, the valve seat is made of special engineering plastic PBI that is resistant to high temperature, wear, corrosion, and not easy to break and deform. The self-lubricating PBI has outstanding sliding characteristics among all plastics and is suitable for use in environments with strict requirements for low friction coefficient and wear resistance. It can meet the design temperature of 250℃ and is more impact-resistant and wear-resistant. The valve core and the valve seat overlap on one side of the 15° end face to form a tight annular surface seal. After the valve seat receives the impact force, it is easy to deform under the force of the ring groove. The valve seat is concave along the inner side of the ring groove, and the outer side of the valve seat is tilted. The outer ring of the valve seat is tilted and tightly attached to the inner wall of the valve body to form a tight sealing surface. The inner ring of the valve seat is recessed downward, and the contact surface between the valve seat and the valve core is reduced. The contact surface between the valve seat and the second step surface of the valve body is reduced to form a reliable annular line seal, which makes the valve more sealed under pressure shock, ensures the sealing of the valve body, valve core and valve seat, and reduces the occurrence of medium leakage.

[0014] The beneficial effects of the utility model: the utility model is a back-blow pulse valve, in which a valve seat, a valve seat support ring and a guide support ring are axially arranged in sequence between the first step and the second step in the valve body, a guide body is arranged in the middle of the guide support ring, and the valve stem is supported between the guide sleeve and the guide body, so that during the reciprocating motion of the valve stem, the valve stem is always supported by the guide sleeve and the guide body, and the valve core and the valve seat are abutted against each other for sealing, which can ensure the axial movement accuracy of the valve stem and prevent the valve stem from bending. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0016] Figure 1 It is a cross-sectional view of the utility model;

[0017] Figure 2 It is a cross-sectional view of the valve body;

[0018] Figure 3It is the matching diagram of valve core, guide support ring, valve seat support ring and valve seat;

[0019] Figure 4 yes Figure 3 A cross-sectional view of

[0020] Figure 5 It is a structural diagram of the valve seat;

[0021] Figure 6 It is a cross-sectional view of the valve seat;

[0022] In the figure: 1-valve body, 2-valve stem, 3-guide sleeve, 4-valve core, 5-guide support ring, 6-valve seat support ring, 7-valve seat, 8-guide body, 9-connecting rod, 10-guide sleeve, 11-first step, 12-second step, 14-bellows, 15-inclined surface, 16-ring groove. DETAILED DESCRIPTION

[0023] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0024] like Figure 1-4 As shown, the utility model is a back-blowing pulse valve, comprising: a valve body 1; a valve stem 2, the end of which is provided with a guide sleeve 3, the valve stem 2 passes through the guide sleeve 3, is slidably arranged in the valve body 1, and a valve core 4 is arranged on the guide sleeve 5; a guide support ring 5, which is arranged at a first step 11 at the outlet of the valve body 1; a valve seat support ring 6, which is arranged at the end of the guide support ring 5; a valve seat 7, which is arranged at the valve seat support ring 6 and the second step 12 in the valve body 1; a guide body 8, which is arranged at the center of the guide support ring 5 through a connecting rod 9 and is supported by the end of the valve stem 2;

[0025] In this solution, a valve seat, a valve seat support ring, and a guide support ring are axially arranged between the first step and the second step in the valve body in sequence. A guide body is arranged in the middle of the guide support ring, and the valve stem is supported between the guide sleeve and the guide body. In this way, the valve stem is always supported by the guide sleeve and the guide body during the reciprocating motion of the valve stem, and the valve core and the valve seat are abutted against each other for sealing, which can ensure the axial movement accuracy of the valve stem and prevent the valve stem from bending.

[0026] like Figure 1 , 2 As shown in 3, in order to increase the service life of the guide body, the utility model adopts a guide sleeve 10 made of polyamide material arranged in the guide body 9;

[0027] The guide sleeve made of polyamide is not easily worn, ensuring the centering and stability of the valve stem.

[0028] like Figure 1 As shown, in order to ensure that the valve stem will not be corroded, the utility model adopts a bellows 14, which is sleeved outside the valve stem 2, one end of which is fixed to the valve stem 2, and the other end is fixedly connected to the guide sleeve 3;

[0029] The bellows sleeve is fixed outside the valve stem. On the one hand, it prevents the leakage of inlet and outlet gases, that is, the bellows plays a sealing role after compression. On the other hand, it protects most of the valve stem, eliminates the erosion and corrosion of high-pressure crude synthesis gas, and effectively extends the service life of the valve stem.

[0030] like Figure 4 , 5 As shown, in order to ensure the sealing of the valve body, valve core and valve seat, the utility model adopts a slope 15 extending obliquely downward from the center of the top surface of the valve seat 7 toward the inner diameter of the valve seat 7, and the angle between the slope 15 and the horizontal plane is 15°. An annular groove 16 is provided on the top surface of the valve seat 7 and on the outside of the slope 15.

[0031] In this solution, the valve seat is made of PBI polymer material, a 15° bevel is opened on the top of the valve seat, and an R1-sized annular groove is processed on the inner ring. The valve core and the valve seat overlap on one side of the 15° end face to form a tight annular surface seal. After the valve seat receives impact force, it is easy to deform under the force of the annular groove. The valve seat is concave along the inner side of the annular groove, and the outer side of the valve seat is tilted. The outer ring of the valve seat is tilted and tightly adheres to the inner wall of the second step of the valve body to form a tight sealing surface. The inner ring of the valve seat is recessed downward, and the contact surface between the valve seat and the valve core is reduced. The contact surface between the valve seat and the second step of the valve body is reduced to form a reliable annular line seal, which makes the valve more sealed under pressure shock, ensures the sealing of the valve body, valve core and valve seat, and reduces the occurrence of medium leakage.

[0032] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A back-blowing pulse valve, characterized in that: include: Valve body; A valve stem, an end of which is provided with a guide sleeve, the valve stem passes through the guide sleeve, is slidably arranged in the valve body, and a valve core is arranged on the guide sleeve; A guide support ring, which is arranged at the first step at the outlet of the valve body; a valve seat support ring, which is arranged at the end of the guide support ring; A valve seat, which is arranged at the valve seat support ring and the second step in the valve body; The guide body is arranged at the center of the guide support ring through a connecting rod and is used to support the end of the valve stem.

2. A backflush pulse valve according to claim 1, characterized in that: A guide sleeve made of polyethylamide is arranged in the guide body.

3. A backflush pulse valve according to claim 1, characterized in that: Also includes: The bellows is sleeved outside the valve stem, one end of which is fixed to the valve stem, and the other end of which is fixedly connected to the guide sleeve.

4. A backflush pulse valve according to claim 1, characterized in that: An inclined surface is provided at the center of the top surface of the valve seat and extends obliquely downward toward the inner diameter of the valve seat.

5. A backflush pulse valve according to claim 4, characterized in that: The top surface of the valve seat is provided with an annular groove outside the inclined surface.

6. A backflush pulse valve according to claim 4, characterized in that: The angle between the inclined plane and the horizontal plane is 15°.

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