A gas reflux device for a blower

Abstract

The present invention relates to the technical field of blowers, and specifically to a gas reflux device for a blower; it comprises a connecting pipe provided with an air inlet and an air outlet, a reflux cooling body and a reflux protection valve; a first flange is provided on the air inlet; the upper and lower ends of the outer cylinder of the reflux cooling body are respectively sealed and fixedly connected with the upper cover plate and the lower cover plate, and a water inlet and a water outlet are also provided on the cylinder wall of the outer cylinder; the inner cylinder is arranged inside the outer cylinder, the upper and lower ends of the inner cylinder respectively pass through the upper cover plate and the lower cover plate, the upper cover plate and the lower cover plate are both sealed and fixedly connected with the inner cylinder, a second flange is provided at the upper end of the inner cylinder, and the second flange cooperates with the first flange; a reflux protection valve is also provided in the air inlet of the connecting pipe. By providing a reflux cooling body to cool the refluxed gas, and then the cooled gas flows to the blower inlet through the reflux protection valve, the damage to the equipment caused by the direct reflux of high-temperature and high-pressure gas is reduced; a partition is provided between the inner and outer cylinders to increase the cooling effect.

Description

Technical Field

[0001] The invention relates to the technical field of blowers, in particular to a gas reflux device of a blower. Background Art

[0002] Blowers convey flammable, explosive and toxic gases. When the blower itself is over-pressured or the flow rate is too large, the exhausted gas needs to flow back to the blower inlet. The traditional practice is to set a reflux pipe between the exhaust port and the air inlet to return the high-pressure gas to the air inlet. However, this practice does not take into account the temperature requirements of most equipment for the inlet gas. The direct reflux of high-temperature and high-pressure gas can easily cause damage to the equipment and affect the service life of the blower. At the same time, high-pressure toxic gas may also leak, endangering human health. The high-temperature gas is not cooled and directly enters the blower from the air inlet. After being discharged by the blower, the temperature will further increase, resulting in the possibility of deflagration of the conveyed flammable and explosive gas, causing a serious accident. Summary of the invention

[0003] Aiming at the technical problems in the prior art of direct reflux of high-temperature and high-pressure gas causing equipment damage, toxic gas leakage and easy explosion of flammable gas, the present invention proposes a gas reflux device for a blower.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a blower gas reflux device, including a connecting pipe, a reflux cooling body and a reflux protection valve; the connecting pipe includes an air inlet and an air outlet, and the air inlet is provided with a first flange; the reflux cooling body includes an outer cylinder, an upper cover plate, a lower cover plate and an inner cylinder; the upper and lower ends of the outer cylinder are respectively sealed and fixedly connected with the upper cover plate and the lower cover plate, and a water inlet and a water outlet are also provided on the cylinder wall of the outer cylinder; the inner cylinder is arranged inside the outer cylinder, and the upper and lower ends of the inner cylinder respectively pass through the upper cover plate and the lower cover plate, and the upper cover plate and the lower cover plate are both sealed and fixedly connected with the inner cylinder, and the upper end of the inner cylinder is provided with a second flange, and the second flange cooperates with the first flange; the reflux protection valve is arranged in the air inlet of the connecting pipe.

[0005] Preferably, the water inlet is located at the lower end of the outer cylinder wall, the water outlet is located at the upper end of the outer cylinder wall, and the center line of the water inlet and the center line of the water outlet are perpendicular to each other.

[0006] Preferably, a partition is further provided between the outer cylinder and the inner cylinder, the upper and lower ends of the partition are respectively sealed and fixedly connected to the upper cover plate and the lower cover plate, and the left and right sides of the partition are respectively sealed and fixedly connected to the inner cylinder and the outer cylinder; the partition is located on one side of the water inlet and close to the water outlet.

[0007] Preferably, a first groove is provided on the inner side of the first flange end surface; a second groove is provided on the inner side of the second flange end surface, and the first groove is arranged opposite to the second groove.

[0008] Preferably, the center line of the air inlet and the center line of the air outlet are perpendicular to each other, and the connecting pipe is provided with a threaded hole on the pipe wall on the side opposite to the air inlet; the backflow protection valve comprises a valve seat, a valve body and an adjusting device; the valve seat comprises a valve seat body and a sealing edge, the valve seat body is cylindrical, and the upper end face is a conical surface inclined inwardly; the sealing edge is arranged on the outside of the valve seat body and surrounds the circumference of the cylindrical valve seat body, and the valve seat body and the sealing edge are cast integrally; the upper part of the sealing edge is located in the first groove of the first flange, and the lower part of the sealing edge is located in the second groove of the second flange; the side surface of the valve body is a conical surface, and cooperates with the conical upper end face of the valve seat body; the adjusting device is arranged above the valve body, and the adjusting device comprises an adjusting screw, the adjusting screw is threadably cooperated with the threaded hole, and the upper end of the adjusting screw extends outward through the threaded hole.

[0009] Preferably, the adjusting device also includes a spring sleeve, a pressure guide sleeve and a spring; a through hole is provided in the middle of the valve body, the spring sleeve passes through the through hole in the middle of the valve body, and the upper end is sealed and fixedly connected to the valve body, and the lower end is sealed and fixedly connected to the spring bottom cover; the spring is vertically arranged in the spring sleeve, and the bottom end is attached to the spring bottom cover; the pressure guide sleeve is sleeved on the upper end of the spring; a guide hole is provided in the middle of the upper surface of the pressure guide sleeve, and a guide head is provided at the lower end of the adjusting screw rod, and the guide head is located in the guide hole.

[0010] Preferably, a wrench head is provided at the upper end of the adjusting screw rod, and the wrench head is a square block.

[0011] Preferably, a nut is provided on the adjusting screw, and the nut cooperates with the adjusting screw through a thread; the nut is pressed against the upper surface of the threaded hole of the connecting pipe; a cover is provided on the upper part of the adjusting screw, the lower end of the cover is open, and a thread is provided on the inner side of the opening, and the cover cooperates with the adjusting screw through the thread on the inner side of the lower end opening.

[0012] Preferably, a sealing gasket is provided between the lower portion of the sealing edge and the second groove of the second flange.

[0013] Preferably, a plurality of heat sinks are evenly arranged in the circumferential direction inside the inner cylinder, the lower ends of the heat sinks are aligned with the lower end of the inner cylinder, and the upper ends of the heat sinks are aligned with the upper end of the inner cylinder.

[0014] Compared with the prior art, the advantages and positive effects of the present invention are: (1) by providing a reflux cooling body to cool the reflux gas, the cooled gas is then directed to flow to the blower inlet through a reflux protection valve, thereby reducing damage to the equipment caused by direct reflux of high-temperature and high-pressure gas; (2) a partition is provided between the inner and outer cylinders, and the partition is located on the side of the water inlet that is biased toward the water outlet. The water entering from the water inlet must make a circle before leaving from the water outlet, thereby increasing the cooling effect; (3) a sealing edge is provided on the outer side of the valve seat body, and the sealing edge is embedded in the grooves of the first flange and the second flange. A sealing gasket is also provided between the lower part and the second groove of the second flange, thereby increasing the sealing performance of the valve seat with the first flange and the second flange and reducing gas leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the following briefly introduces the drawings required for describing the embodiment;

[0016] Figure 1 is a cross-sectional view of the device;

[0017] Figure 2 for Figure 1 Sectional view at AA in the middle;

[0018] Figure 3 for Figure 1 The enlarged view of point B in the middle;

[0019] Figure 4 It is a cross-sectional view of the connecting pipe and the reflux cooling body of the device;

[0020] Figure 5 for Figure 4 Enlarged view of point C in the middle;

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

[0022] Figure 7 It is a cross-sectional view of the spring sleeve;

[0023] Figure 8 It is a cross-sectional view of the pressure guide sleeve;

[0024] Fig. 9 This is a cross-sectional view of the adjusting screw;

[0025] Fig.10 This is a schematic diagram of the installation of this device in the blower.

[0026] Description of reference numerals:

[0027] 1-connecting pipe, 11-air inlet, 12-air outlet, 13-first flange, 14-first groove, 15-threaded hole;

[0028] 2- reflux cooling body, 21- outer cylinder, 211- water inlet, 212- water outlet, 22- upper cover plate, 23- lower cover plate, 24- inner cylinder, 25- heat sink, 26- partition, 27- second flange, 28- second groove;

[0029] 3-valve seat, 31-valve seat body, 32-sealing edge;

[0030] 4-valve body;

[0031] 5-spring sleeve, 51-spring bottom cover;

[0032] 6-pressure guide sleeve, 61-guide hole;

[0033] 7- Spring;

[0034] 8-adjusting screw rod, 81-guide head, 82-wrench screw head, 83-nut, 84-cover;

[0035] 9-Sealing gasket;

[0036] 10- Blower body. DETAILED DESCRIPTION

[0037] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure. Example

[0039] The following is combined with Figure 1-10 The present invention is further described, a blower gas reflux device, such as Figure 1 , 4As shown in Figure 10, it includes a connecting pipe 1, a reflux cooling body 2 and a reflux protection valve; the connecting pipe 1 includes an air inlet 11 and an air outlet 12, and the air inlet 11 is provided with a first flange 13; the reflux cooling body 2 includes an outer cylinder 21, an upper cover plate 22, a lower cover plate 23 and an inner cylinder 24; the upper and lower ends of the outer cylinder 21 are respectively sealed and fixedly connected to the upper cover plate 22 and the lower cover plate 23, and the cylinder wall of the outer cylinder 21 is also provided with a water inlet 211 and a water outlet 212; the inner cylinder 24 is arranged inside the outer cylinder 21 The upper and lower ends of the inner cylinder 24 pass through the upper cover plate 22 and the lower cover plate 23 respectively, and the upper cover plate 22 and the lower cover plate 23 are both sealed and fixedly connected to the inner cylinder 24. The upper end of the inner cylinder 24 is provided with a second flange 27, and the second flange 27 cooperates with the first flange 13; the backflow protection valve is arranged in the air inlet 11 of the connecting pipe 1; the air inlet 11 of the connecting pipe 1 is connected to the air inlet end of the blower body 10 through a pipeline, and the lower end of the inner cylinder 24 of the reflux cooling body 2 is connected to the exhaust end of the blower body 10 through a pipeline.

[0040] Cooling water is input from the water inlet 211 on the outer cylinder 21, and the cooling water fills the space between the inner cylinder 24, the outer cylinder 21, and the upper cover plate 22 and the lower cover plate 23; a backflow protection valve is arranged in the connecting pipe 1, and when the gas transported by the blower is over-pressured or the flow rate is too large, the backflow protection valve opens, and the high-temperature and high-pressure gas flows back from the exhaust end of the blower body 10 through the inner cylinder 24, the connecting pipe 1, and then through the air inlet 11 and the air intake pipeline of the blower body 10 to the blower inlet; when the high-temperature and high-pressure reflux gas passes through the inner cylinder 24, heat exchange is performed with the cooling water, which reduces the temperature of the reflux gas and reduces the damage to the equipment caused by the direct reflux of the high-temperature and high-pressure gas.

[0041] like Figure 1 and 2 As shown, the water inlet 211 is located at the lower end of the wall of the outer cylinder 21, and the water outlet 212 is located at the upper end of the wall of the outer cylinder 21. The center line of the water inlet 211 and the center line of the water outlet 212 are perpendicular to each other.

[0042] like Figure 2 As shown, a partition plate 26 is further provided between the outer cylinder 21 and the inner cylinder 24, and the upper and lower ends of the partition plate 26 are respectively sealed and fixedly connected to the upper cover plate 22 and the lower cover plate 23, and the left and right sides of the partition plate 26 are respectively sealed and fixedly connected to the inner cylinder 24 and the outer cylinder 21; the partition plate 26 is located on one side of the water inlet 211 and close to the water outlet 212.

[0043] Since the center lines of the water inlet 211 and the water outlet 212 are perpendicular to each other, and a partition 26 is provided on one side which is 90° apart from the other, the cooling water entering from the water inlet 211 goes around the inner cylinder 24 once and then is discharged from the water outlet 212, thereby improving the utilization efficiency of the cooling water and enhancing the cooling effect.

[0044] like Figure 4 and 5 As shown, a first groove 14 is provided on the inner side of the end surface of the first flange 13 ; a second groove 28 is provided on the inner side of the end surface of the second flange 27 , and the first groove 14 and the second groove 28 are arranged opposite to each other.

[0045] like Figure 1 , 4 , 5 and 6, the center line of the air inlet 11 and the center line of the air outlet 12 are perpendicular to each other, and the connecting pipe 1 is provided with a threaded hole 15 on the pipe wall on the side opposite to the air inlet 11; the backflow protection valve comprises a valve seat 3, a valve body 4 and an adjusting device; the valve seat 3 comprises a valve seat body 31 and a sealing edge 32, the valve seat body 31 is cylindrical, and the upper end surface is an inwardly inclined conical surface; the sealing edge 32 is arranged on the outside of the valve seat body 31, and surrounds the cylindrical valve seat body 31 in a circle, and the valve seat body The valve body 31 and the sealing edge 32 are integrally cast; the upper part of the sealing edge 32 is located in the first groove 14 of the first flange 13, and the lower part of the sealing edge 32 is located in the second groove 28 of the second flange 27; the side surface of the valve body 4 is a conical surface, and cooperates with the conical upper end surface of the valve seat body 31; the adjusting device is arranged above the valve body 4, and the adjusting device includes an adjusting screw rod 8, and the adjusting screw rod 8 is threadedly matched with the threaded hole 15, and the upper end of the adjusting screw rod 8 extends outward through the threaded hole 15.

[0046] The sealing edge 32 of the valve seat 3 is inserted into the first groove 14 and the second groove 28. The protruding sealing edge 32 makes the gas leakage route more tortuous, and the coordinated arrangement reduces the gas leakage from the first flange 13, the second flange 27 and the valve seat 3, thereby enhancing the sealing performance.

[0047] like Figure 1 , 7 As shown in , 8 and 9, the regulating device also includes a spring sleeve 5, a pressure guide sleeve 6 and a spring 7; a through hole is provided in the middle of the valve body 4, the spring sleeve 5 passes through the through hole in the middle of the valve body 4, and the upper end is sealed and fixedly connected to the valve body 4, and the lower end is sealed and fixedly connected to the spring bottom cover 51; the spring 7 is vertically arranged in the spring sleeve 5, and the bottom end is attached to the spring bottom cover 51; the pressure guide sleeve 6 is sleeved on the upper end of the spring 7; a guide hole 61 is provided in the middle of the upper surface of the pressure guide sleeve 6, and a guide head 81 is provided at the lower end of the adjusting screw rod 8, and the guide head 81 is located in the guide hole 61.

[0048] like Fig. 9 As shown, a wrench head 82 is provided at the upper end of the adjusting screw rod 8, and the wrench head 82 is a square block.

[0049] like Figure 1As shown, a nut 83 is provided on the adjusting screw rod 8, and the nut 83 cooperates with the adjusting screw rod 8 through a thread; the nut 83 is pressed tightly on the upper surface of the threaded hole 15 of the connecting pipe 1; a cover 84 is sleeved on the upper part of the adjusting screw rod 8, and the lower end of the cover 84 is open, and a thread is provided on the inner side of the opening, and the cover 84 cooperates with the adjusting screw rod 8 through the thread on the inner side of the lower end opening.

[0050] The spring 7 can be configured with different specifications according to the set pressure of different blowers, and the pressure of the spring 7 can be fine-tuned by adjusting the screw rod 8.

[0051] like Figure 1 and 3 As shown, a sealing gasket 9 is further provided between the lower portion of the sealing edge 32 and the second groove 28 of the second flange 27. The sealing gasket 9 is provided under the sealing edge 32 to enhance the sealing performance of the device.

[0052] like Figure 1 and 2 As shown, eight heat sinks 25 are evenly arranged in the circumferential direction of the inner cylinder 24, and the lower ends of the heat sinks 25 are aligned with the lower end of the inner cylinder 24, and the upper ends of the heat sinks 25 are aligned with the upper end of the inner cylinder 24. The eight heat sinks 25 absorb part of the heat of the high-temperature gas entering from the lower end of the inner cylinder 24, especially the gas in the middle of the cylinder is difficult to contact with the inner cylinder 24 to conduct the heat away, and the heat sink 25 transfers the absorbed heat to the inner cylinder 24, which is absorbed by the cooling water, thereby enhancing the cooling effect.

[0053] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes for application in other fields. However, any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A blower gas reflux device, characterized in that: It comprises a connecting pipe (1), a reflux cooling body (2) and a reflux protection valve; The connecting pipe (1) comprises an air inlet (11) and an air outlet (12), and the air inlet (11) is provided with a first flange (13); The reflux cooling body (2) comprises an outer cylinder (21), an upper cover plate (22), a lower cover plate (23) and an inner cylinder (24); the upper and lower ends of the outer cylinder (21) are respectively sealed and fixedly connected to the upper cover plate (22) and the lower cover plate (23); a water inlet (211) and a water outlet (212) are also provided on the cylinder wall of the outer cylinder (21); the inner cylinder (24) is arranged inside the outer cylinder (21); the upper and lower ends of the inner cylinder (24) respectively pass through the upper cover plate (22) and the lower cover plate (23); the upper cover plate (22) and the lower cover plate (23) are both sealed and fixedly connected to the inner cylinder (24); a second flange (27) is provided at the upper end of the inner cylinder (24); the second flange (27) cooperates with the first flange (13); The backflow protection valve is arranged in the air inlet (11) of the connecting pipe (1); A first groove (14) is provided on the inner side of the end surface of the first flange (13); a second groove (28) is provided on the inner side of the end surface of the second flange (27), and the first groove (14) and the second groove (28) are arranged opposite to each other; The center line of the air inlet (11) and the center line of the air outlet (12) are perpendicular to each other, and the connecting pipe (1) is provided with a threaded hole (15) on the pipe wall on the side opposite to the air inlet (11); The backflow protection valve comprises a valve seat (3), a valve body (4) and a regulating device; The valve seat (3) comprises a valve seat body (31) and a sealing edge (32); the valve seat body (31) is cylindrical, and the upper end surface is an inwardly inclined conical surface; the sealing edge (32) is arranged on the outside of the valve seat body (31) and surrounds the cylindrical valve seat body (31) in a circle in the circumferential direction; the valve seat body (31) and the sealing edge (32) are integrally cast; the upper part of the sealing edge (32) is located in the first groove (14) of the first flange (13), and the lower part of the sealing edge (32) is located in the second groove (28) of the second flange (27); The side surface of the valve body (4) is a conical surface, and cooperates with the conical upper end surface of the valve seat body (31); The adjusting device is arranged above the valve body (4), and comprises an adjusting screw rod (8). The adjusting screw rod (8) is threadably matched with the threaded hole (15), and the upper end of the adjusting screw rod (8) passes through the threaded hole (15) and protrudes outward; The regulating device further comprises a spring sleeve (5), a pressure guide sleeve (6) and a spring (7); A through hole is provided in the middle of the valve body (4); the spring sleeve (5) passes through the through hole in the middle of the valve body (4); the upper end is sealed and fixedly connected to the valve body (4); and the lower end is sealed and fixedly connected to a spring bottom cover (51); the spring (7) is vertically arranged in the spring sleeve (5), and the bottom end is attached to the spring bottom cover (51); the pressure guide sleeve (6) is sleeved on the upper end of the spring (7); A guide hole (61) is provided in the middle of the upper surface of the pressure guide sleeve (6), and a guide head (81) is provided at the lower end of the adjusting screw rod (8), wherein the guide head (81) is located in the guide hole (61).

2. A blower gas reflow device according to claim 1, characterized in that: The water inlet (211) is located at the lower end of the wall of the outer cylinder (21), the water outlet (212) is located at the upper end of the wall of the outer cylinder (21), and the center line of the water inlet (211) and the center line of the water outlet (212) are perpendicular to each other.

3. A blower gas reflow device according to claim 2, characterized in that: A partition plate (26) is further provided between the outer cylinder (21) and the inner cylinder (24); the upper and lower ends of the partition plate (26) are respectively sealed and fixedly connected to the upper cover plate (22) and the lower cover plate (23); and the left and right sides of the partition plate (26) are respectively sealed and fixedly connected to the inner cylinder (24) and the outer cylinder (21); The partition plate (26) is located on one side of the water inlet (211) and is close to the water outlet (212).

4. A blower gas reflow device according to claim 1, characterized in that: The upper end of the adjusting screw rod (8) is provided with a wrench screw head (82), and the wrench screw head (82) is a square block.

5. A blower gas reflow device according to claim 4, characterized in that: The adjusting screw rod (8) is provided with a nut (83), and the nut (83) and the adjusting screw rod (8) are threadably matched; the nut (83) is pressed tightly against the upper surface of the threaded hole (15) of the connecting pipe (1); The upper part of the adjusting screw rod (8) is sleeved with a cover (84), the lower end of the cover (84) is open, and a thread is provided on the inner side of the opening, and the cover (84) cooperates with the adjusting screw rod (8) through the thread on the inner side of the lower end opening.

6. A blower gas reflow device according to claim 1, characterized in that: A sealing gasket (9) is also provided between the lower portion of the sealing edge (32) and the second groove (28) of the second flange (27).

7. A blower gas reflow device according to claim 1, characterized in that: A plurality of heat sinks (25) are evenly arranged in the circumferential direction inside the inner cylinder (24), the lower ends of the heat sinks (25) being aligned with the lower end of the inner cylinder (24), and the upper ends of the heat sinks (25) being aligned with the upper end of the inner cylinder (24).

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