CN116608290A - Reversing valve - Google Patents

Abstract

The invention discloses a reversing valve. The four-way reversing valve is a four-way reversing valve or the superposition of more than 2 four-way reversing valves, the four-way reversing valve comprises an upper shell, a lower shell, valve discs, valve seats, valve shafts and springs, the valve seats are disc-shaped, the upper surfaces of the valve seats are sealing surfaces, the valve discs consist of a chassis, a channel pipe and a channel pipe B, the lower surfaces of the chassis are sealing surfaces, the valve discs are arranged on the valve seats, end surfaces between the valve discs and the valve seats are sealed, the valve discs are always clung to the valve seats under the action of the springs, and the valve discs can rotate in a 90-degree reciprocating manner. The reversing valve can be independently used as a four-way reversing valve, two stacks can be used as eight-way reversing valves, and more than two combinations can be used as multi-way reversing valves. The invention is used in regenerative combustion and regenerative air preheater, and has the advantages of good sealing performance, simple and reliable structure, high cost performance and the like.

Description

Reversing valve

Technical Field

The invention belongs to the technical field of regenerative combustion technology and regenerative air preheaters, and relates to a reversing valve for changing the flow direction of smoke and air.

Background

The regenerative combustion technology is a brand new combustion technology which is popularized and adopted in the ferrous and metallurgical industry in the 90 th century. The flue gas waste heat recovery device has the advantages of high efficiency of flue gas waste heat recovery, low flue gas temperature of 150 ℃, high preheated air temperature, air temperature of about 1000 ℃, low NOx emission and the like.

The reversing valve is an important device for realizing the regenerative combustion technology, and changes the flow direction of the smoke and the air by switching the reversing valve, and the function is consistent with that of the reversing valve of the regenerative air preheater.

Document one (Liu Zhanzeng, jiang Yanghu, ding Cuijiao, etc., the collection of the annual meeting of steel in 2007, 2007: 1138-1139.) describes 6 common reversing valves for regenerative furnaces at home and abroad in the steel industry: the combined reversing valve, the two-position five-way reversing valve, the large four-way reversing valve, the small rotary four-way reversing valve, the small three-way reversing valve and the double-closing three-way reversing valve are used for discussing the control mode, the reversing time, the sealing performance and the service life of the reversing valve. The literature firstly points out the common problems of the 6 reversing valves in practical use: the sealing ring is burnt, the actuating mechanism is inflexible and not in place, the sealing is not tight, the air leakage problem is solved, and the valve clack of the rotary valve is fallen off, the medium is short-circuited and the like.

The flame heating furnace is widely used in petrochemical industry, and mainly uses fuel gas as fuel, and the flame directly heats the process stream flowing in the furnace tube. In recent years, as the thermal efficiency of a heating furnace is continuously improved, the exhaust gas temperature is lower and lower, and even reaches about 80 ℃, and the dew point corrosion problem of the air preheater made of metal materials is more remarkable.

The literature II (development and industrial application of novel ceramic heat accumulating air preheaters) (Wang Derui, she Dongsheng, shang Gongnian, etc. [ J ]. Oil refining technology and engineering, 2020,50 (01): 41-47.) describes that the domestic petrochemical industry starts to try to adopt the valve switching type ceramic heat accumulating air preheaters in the waste heat recovery system of the flame heating furnace, and the working principle is as follows: the flow direction of the gas is changed through the switching of the valve, so that the air and the flue gas alternately flow through the heat accumulation chamber, and the purpose that the flue gas and the air exchange heat in the heat accumulation chamber through the ceramic heat accumulation body is realized.

Chinese patent CN 206191632U discloses an eight-way valve U-shaped pipe heat accumulating type air preheater, comprising a reversing valve and a regenerator, wherein the reversing valve is a rotary eight-way reversing valve, and the regenerator comprises a left chamber and a right chamber in the form of U-shaped pipes. The eight-way reversing ball valve adopted by the patent is composed of two four-way reversing ball valves through a common valve shaft, so that synchronous reversing of the two four-way ball valves is ensured; the rotary spherical surface after manual grinding is completely matched with the sealing ring to ensure complete sealing. Although the patent solves two problems of reversing valve synchronization and sealing, the eight-way ball valve has the problems of large-scale sealing difficulty, high cost and the like.

Disclosure of Invention

The invention aims to provide a reversing valve for a regenerative combustion and regenerative air preheater, so as to solve the problems of the reversing valve in the prior art and meet the performance requirements of quick action, good sealing, low cost and long service life.

The specific technical scheme of the invention is as follows:

a reversing valve is used in a regenerative combustion and regenerative air preheater, and flue gas and air are communicated with a regenerative chamber through the reversing valve, so that the purpose that the flue gas and the air alternately flow through the regenerative chamber to complete heat exchange is achieved. The reversing valve is characterized in that:

the reversing valve is a four-way reversing valve or the superposition of more than 2 four-way reversing valves, the four-way reversing valve comprises an upper shell, a lower shell, a valve disc, a valve seat, a valve shaft and a spring, end face sealing is arranged between the valve disc and the valve seat, the valve disc is always clung to the valve seat under the action of the spring, and the valve disc can rotate back and forth by 90 degrees;

the upper shell is cylindrical, the bottom of the upper shell is open and connected with the lower shell, the top of the upper shell is closed except the shaft hole, and the side wall of the upper shell is free of interfaces;

the lower shell is cylindrical, the bottom is closed, the top opening is connected with the valve seat and the upper shell, and the side wall is provided with four connectors; the lower shell is internally provided with four partition boards and a shaft sleeve to divide the internal space into four compartments which are not communicated, the side wall of each compartment is provided with an interface, and the top of each compartment is provided with an equal-diameter through hole of a valve seat; the valve seat is disc-shaped, the upper surface of the valve seat is a sealing surface, the valve seat is provided with four equal-diameter through holes with the circle centers on the same circumference except the shaft hole, the four equal-diameter through holes are uniformly distributed at intervals of 90 degrees, and the hole diameter of each equal-diameter through hole is smaller than or equal to 0.5 times of the hole spacing between two adjacent equal-diameter through holes;

the valve disc consists of a chassis, an A channel pipe and a B channel pipe, wherein the lower surface of the chassis is a sealing surface, the A channel pipe and the B channel pipe are positioned on the upper surface of the chassis, and the A channel pipe and the B channel pipe are identical. The chassis is disc-shaped, except the shaft hole and the key groove, four equal-diameter through holes with the centers on the same circumference are arranged on the chassis, the four equal-diameter through holes are uniformly distributed at intervals of 90 degrees, have the same diameters with the four equal-diameter through holes on the valve seat and correspond to each other one by one, and have the same diameter with the circle with the centers of the four equal-diameter through holes on the valve seat. The four equal-diameter through holes of the chassis are sequentially a first chassis hole, a second chassis hole, a third chassis hole and a fourth chassis hole according to the sequence of the anticlockwise directions. On the upper surface of the chassis, the channel A is communicated with the chassis hole I and the chassis hole II, and the channel B is communicated with the chassis hole III and the chassis hole IV.

The spring is sleeved outside the valve shaft between the upper shell and the valve disc.

As a preferred aspect of the present invention, it is further characterized in that: the A channel pipe of the valve disc is a 180-degree bent pipe.

As a preferred aspect of the present invention, it is further characterized in that: the cross section of the A channel pipe of the valve disc is inverted U-shaped, square and trapezoid.

As a preferred aspect of the present invention, it is further characterized in that: the valve seat is made of composite materials, and the optimal combination is a metal plate and a polytetrafluoroethylene plate.

As a preferred aspect of the present invention, it is further characterized in that: the reversing valve is formed by superposing two four-way valves, so that an eight-way valve is formed.

The invention has the beneficial effects that:

1) Compared with the prior art, the reversing valve has the advantages that only one sealing surface is arranged at four interfaces, the sealing surface is obviously reduced, and the leakage probability is greatly reduced.

2) Compared with the sealing mode of the reversing valve in the prior art, the sealing mode of the end face of the reversing valve has the advantages of better sealing performance, simpler structure, higher cost performance, easier manufacture, lower cost and easier realization of large-scale.

3) Compared with the three-dimensional rotation of the valve core of the reversing valve in the prior art, the valve disc plane of the invention rotates in two dimensions, has smaller friction resistance and lower power required by rotation, and is more beneficial to miniaturization of an actuating mechanism.

4) Compared with the three-dimensional rotation of the reversing valve in the prior art, the two-dimensional rotation of the valve disc plane is higher in freedom degree of the valve disc, free expansion can be realized in the radial direction and the axial direction, and abrasion of the sealing surface can be automatically compensated.

5) The valve disc of the invention can automatically grind and polish the sealing surface continuously in the intermittent reciprocating rotation process of 90 degrees, and the sealing performance is improved continuously.

The invention will now be described in further detail with reference to the drawings and the detailed description, without limiting the scope of the invention.

Drawings

FIG. 1 is a schematic diagram of a reversing valve according to the present invention;

FIG. 2 is a cross-sectional view of a reversing valve according to the present invention;

FIG. 3 is an exploded view of a reversing valve of the present invention;

FIG. 4 is a top housing of a reversing valve of the present invention;

FIG. 5 is a lower housing of a reversing valve of the present invention;

FIG. 6 is a top view of a valve disc of a reversing valve of the present invention;

FIG. 7 is a bottom view of a valve disc (see sealing surface of lower surface) of a reversing valve of the present invention;

FIG. 8 is an exploded view of the valve disc of one reversing valve of the present invention;

FIG. 9 is a top view of a valve seat of a reversing valve of the present invention;

FIG. 10 is a top plan view of the change in relation to the conductance of the valve disc and the valve seat openings as the valve disc of the reversing valve of the present invention is intermittently rotated back and forth through 90 degrees;

FIG. 11 is a schematic diagram of the operation of the present invention as a four-way reversing valve (piston rod retracted, valve disc parked in 0 position);

FIG. 12 is a schematic diagram of the operation of the present invention as a four-way reversing valve (piston rod extended, valve disc parked in 90 °);

FIG. 13 is a schematic representation of the operation of two stacked eight-way reversing valves of the present invention (piston rod retracted, valve disc parked in 0 position);

fig. 14 is a schematic representation of the operation of the two stacked eight-way reversing valve of the present invention (piston rod extended, valve disc parked in 90 deg. position).

The reference numerals shown in the figures are:

110. a flue gas stream; 120. an air stream;

1. a valve shaft; 2. a connecting piece; 3. a spring; 4. bolt holes;

10. a reversing valve;

20. an upper housing;

21. a cylinder; 22. a cover plate; 23. a flange; 24. a shaft hole;

30. a valve disc;

31. a channel pipe A; 32. a B channel tube; 33. a chassis; 34. a shaft hole;

35. a key slot; 36. sealing surfaces;

31-1, port one of the A channel tube; 31-2, channel A tube port two;

32-1, port one of the B channel tube; 32-2, B channel tube port two;

33-1, chassis hole one; 33-2, chassis holes II; 33-3, chassis holes III; 33-4, chassis holes IV;

40. a valve seat;

40-1, valve seat hole one; 40-2, valve seat hole II; 40-3, valve seat hole III; 40-4, valve seat hole IV;

40-5, shaft holes; 41. sealing surfaces;

50. a lower housing;

50-1, compartment one; 50-2, compartment two; 50-3, compartment three; 50-4, compartment four;

51. a cylinder; 52. a flange; 53. a cover plate; 54. a partition plate; 55. a shaft sleeve; 56. an interface flange;

57. an interface sleeve;

57-1, four-way interface I; 57-2, a four-way interface II;

57-3, a four-way interface III; 57-4, four-way interface four;

60. an actuator;

61. a cylinder; 62. a piston rod; 63. swing arms; 64. a support; 65. a shaft fixing assembly;

70. a left U-shaped tube; 71. a right U-shaped pipe;

100. an eight-way reversing valve;

100-1, eight-way interface I; 100-2, eight-way interface two;

100-3, eight-way interface three; 100-4, eight-way interface four;

100-5, eight-way interface five; 100-6, eight-way interface six;

100-7, eight-way interface seven; 100-8, eight-way interface eight.

Detailed Description

Fig. 1 is a schematic diagram of a reversing valve 10 according to the present invention.

Fig. 2 shows a sectional view of a reversing valve 10 according to the invention.

Fig. 3 shows an exploded view of a reversing valve 10 of the present invention, more visually depicting the components and mounting locations of the reversing valve 10.

As shown in fig. 1 to 10, the reversing valve 10 is mainly composed of a valve shaft 1, an upper housing 20, a valve disc 30, a valve seat 40, a lower housing 50, and a spring 3. The upper case 20 and the lower case 50 are integrally connected by the connection member 2. The valve seat 40 is located at an inner upper end of the lower housing 50 and is hermetically connected to the lower housing 50. The valve disc 30 is above the valve seat 40, the sealing surface 36 of the valve disc 30 is closely attached to the sealing surface 41 of the valve seat 40, and the valve disc 30 is integrally connected with the valve shaft 1 through the shaft hole 34 and the key groove 35, and synchronously operates. The spring 3 is sleeved outside the valve shaft 1 between the upper shell 20 and the valve disc 30, and the elastic force of the spring 3 presses the valve disc 30, so that the sealing surface 36 of the valve disc 30 always clings to the sealing surface 41 of the valve seat 40, and an end face seal is formed.

Fig. 4 shows an upper housing 20 of a reversing valve 10 of the present invention. The novel flange consists of a cylinder 21, a cover plate 22 and a flange 23, wherein a shaft hole 24 is formed in the center of the cover plate 22, bolt holes 4 are formed in the outer edge of the cover plate 22, and the bolt holes 4 are formed in the outer edge of the flange 23.

Fig. 5 shows a lower housing 50 of a reversing valve 10 of the present invention. The four-way joint consists of a cylinder body 51, a flange 52, a cover plate 53, a partition plate 54, a shaft sleeve 55, a joint flange 56 and a joint sleeve 57, wherein the number of the joint flange 56 and the joint sleeve 57 is four, four round holes which are uniformly distributed at intervals of 90 degrees are formed in the side wall of the cylinder body 51 and are in butt joint with the joint sleeve 57 to form four joints, namely a four-way joint one 57-1, a four-way joint two 57-2, a four-way joint three 57-3 and a four-way joint four 57-4. Four partition plates 54 and a shaft sleeve 55 are positioned in the cylinder 51 to divide the inner space of the lower shell 50 into four compartments which are not communicated with each other, namely a first compartment 50-1, a second compartment 50-2, a third compartment 50-3 and a fourth compartment 50-4, and each compartment side wall is provided with a side wall interface in a corresponding relationship that the first compartment 50-1 corresponds to the first four-way interface 57-1, the second compartment 50-2 corresponds to the second four-way interface 57-2, the third compartment 50-3 corresponds to the third four-way interface 57-3 and the fourth compartment 50-4 corresponds to the fourth four-way interface 57-4. The top of each compartment is distributed with an equal diameter through hole of the valve seat 40, and the corresponding relationship is that the first compartment 50-1 corresponds to the first valve seat hole 40-1, the second compartment 50-2 corresponds to the second valve seat hole 40-2, the third compartment 50-3 corresponds to the third valve seat hole 40-3, and the fourth compartment 50-4 corresponds to the fourth valve seat hole 40-4. The outer edge of the cover plate 53 is provided with bolt holes 4, and the outer edge of the flange 52 is also provided with bolt holes 4.

Fig. 6 shows a top view of a valve disk 30 of a reversing valve 10 according to the invention.

Fig. 7 shows a bottom view of the valve disk 30 (see seal surface 36 of the lower surface) of a reversing valve 10 of the present invention.

Fig. 8 shows an exploded view of a valve disc 30 of a reversing valve 10 of the present invention.

As shown in fig. 6 to 8, the valve disc 30 is composed of an a-channel tube 31, a B-channel tube 32, and a chassis 33, the a-channel tube 31 and the B-channel tube 32 are located above the chassis 33, and the lower surface of the chassis 33 is a sealing surface 36.

As shown in fig. 6 to 8, the a-channel pipe 31 is a 180-degree bent pipe, and two ports thereof are a-channel pipe port one 31-1 and a-channel pipe port two 31-2, respectively.

As shown in fig. 6 to 8, the B-channel tube 32 is identical to the a-channel tube 31, and is also a 180-degree bent tube, and two ports thereof are a B-channel tube port one 32-1 and a B-channel tube port two 32-2, respectively.

As shown in fig. 6 to 8, the chassis 33 is disc-shaped, the center of the disc is provided with a shaft hole 34 and a key groove 35, in addition, the chassis 33 is provided with four equal diameter through holes with the centers on the same circumference, the four equal diameter through holes of the chassis are sequentially 33-1, 33-2, 33-3 and 33-4 of the chassis, the four chassis holes 33-1, 33-2, 33-3 and 33-4 are uniformly distributed at intervals of 90 degrees, the diameters of the four equal diameter through holes on the valve seat 40 are the same and correspond to each other one by one, and the diameters of the holes of the chassis holes 33-1, 33-2, 33-3 and 33-4 are smaller than or equal to 0.5 times the distance between two adjacent chassis holes.

As shown in fig. 6-8, the first port 31-1 of the channel A pipe is welded with the first 33-2 of the chassis hole, and the second port 31-2 of the channel A pipe is welded with the second 33-3 of the chassis hole; the first port 32-1 of the B channel tube is welded with the first 33-1 of the chassis hole, and the second port 32-2 of the B channel tube is welded with the first 33-4 of the chassis hole, so that the A channel tube 31, the B channel tube 32 and the chassis 33 form a complete valve disc 30. The valve disc 30 is integrally connected to the valve shaft 1 via the shaft hole 34 and the key groove 35.

Fig. 9 is a top view of a valve seat 40 of a reversing valve 10 of the present invention. As shown in FIG. 9, the valve seat 40 is also disc-shaped, four equal diameter through holes with the centers on the same circumference are arranged on the valve seat 40, and are respectively a first valve seat hole 40-1, a second valve seat hole 40-2, a third valve seat hole 40-3 and a fourth valve seat hole 40-4, the four valve seat holes 40-1, 40-2, 40-3 and 40-4 are uniformly distributed at intervals of 90 degrees, the hole diameters of the valve seat holes 40-1, 40-2, 40-3 and 40-4 are smaller than or equal to 0.5 times of the distance between two adjacent valve seat holes, the diameters of the equal diameter through holes are the same as and correspond to the diameters of the four equal diameter through holes on the chassis 33 of the valve seat 30, the diameters of the circles with the centers of the four equal diameter through holes on the valve seat 40 are equal to the diameters of the circles with the centers of the four equal diameter through holes on the chassis 33, and the center of the disc of the valve seat 40 is also provided with a shaft hole 40-5.

As shown in fig. 2 and 3, the valve seat 40 is sealingly connected to the upper portion of the lower housing 50, and each valve seat aperture has a corresponding compartment, which corresponds to: the first valve seat hole 40-1 corresponds to the first compartment 50-1, the second valve seat hole 40-2 corresponds to the second compartment 50-2, the third valve seat hole 40-3 corresponds to the third compartment 50-3, and the fourth valve seat hole 40-4 corresponds to the fourth compartment 50-4.

As shown in fig. 3, four compartments of the lower housing 50: compartment one 50-1, compartment two 50-2, compartment three 50-3 and compartment four 50-4, and four channel interfaces of the lower housing 50: four valve seat holes of the valve seat 40, four-way interface one 57-1, four-way interface two 57-2, four-way interface three 57-3, and four-way interface four 57-4: valve seat hole one 40-1, valve seat hole two 40-2, valve seat hole three 40-3 and valve seat hole four 40-4 form four completely isolated channels as follows:

four-way interface one 57-1- > compartment one 50-1- > valve seat hole one 40-1;

four-way interface two 57-2-compartment two 50-2-valve seat hole two 40-2;

four-way interface III 57-3-compartment III 50-3-valve seat hole III 40-3;

four-way interface IV 57-4- > compartment IV 50-4- > valve seat hole IV 40-4;

the four fully isolated passages are interconnected by the valve disc 30.

Fig. 10 is a top view showing the change in the communication relationship between the valve disc 30 and the respective holes of the valve seat 40 when the valve disc 30 is intermittently reciprocated by 90 deg. in the reversing valve 10 according to the present invention.

As shown in fig. 10, the valve seat 40 is fixed, the valve disc 30 is intermittently and reciprocally rotated by 90 °, and the valve disc 30 is conducted through the through holes of the valve seat 40 as follows:

when the valve disc 30 rotates to the 0 position, 40-1 and 40-4 are in communication and 40-3 and 40-2 are in communication.

When the valve disc 30 rotates to the 90 position, 40-1 and 40-2 are in communication and 40-3 and 40-4 are in communication.

When the valve disc 30 is rotated to the 45 DEG position, the bottom plate holes 33-1, 33-2, 33-3, 33-4 of the valve disc 30 are just located between the holes of the valve seat holes 40-1, 40-2, 40-3, 40-4, and since the hole diameters of the valve seat holes 40-1, 40-2, 40-3, 40-4 are smaller than or equal to 0.5 times the hole spacing between the adjacent two valve seat holes, the hole diameters of the bottom plate holes 33-1, 33-2, 33-3, 33-4 are the same as the diameters of the valve seat holes 40-1, 40-2, 40-3, 40-4, so that the valve disc 30 and the valve seat 40 are mutually blocked and opened, and therefore, the valve seat 30 cannot be conducted to any two holes of the valve seat 40, and the through holes of the valve seat 40 are not mutually communicated and mutually isolated.

From the above description of the rotation of the valve disc 30 to the 0 °, 45 °, 90 ° positions, it can be seen that the reversing conduction between the through holes of the valve seat 40 can be achieved by the intermittent reciprocation of the valve disc 30 by 90 °. Since the four through holes of the valve seat 40 are communicated with the four interfaces of the lower housing 50 in one-to-one correspondence, reversing flow of the flue gas stream and the air stream at the four interfaces of the lower housing 50 is realized in the reversing valve 10 by the intermittent reciprocating rotation of 90 ° of the valve disc 30.

The following is a detailed description of examples.

Example 1

Example 1 the present invention operates as a four-way reversing valve.

By this embodiment, it is specifically described how the present invention works as a four-way reversing valve, with the flue gas stream and the air stream being reversed by the reversing valve 10. In this embodiment the flue gas stream is indicated at 110 and the air stream is indicated at 120.

As shown in fig. 11 and 12, this embodiment is composed of a reversing valve 10 and an actuator 60. The actuator 60 is composed of a cylinder 61, a piston rod 62, a swing arm 63, a support 64 and a shaft fixing assembly 65.

As shown in fig. 11 and 12, the cylinder 61 is fixed to the upper surface side of the cover plate of the upper housing 20 of the reversing valve 10 by a bracket 64, and the valve shaft 1 is positioned at the center of the cover plate of the upper housing 20 of the reversing valve 10 by a shaft fixing assembly 65. The swing arm 63 is driven to rotate the valve shaft 1 by intermittent expansion and contraction of the piston rod 62 in the cylinder 61, and the valve shaft 1 drives the valve disc 30 to perform 90-degree intermittent reciprocating rotation.

In fig. 11 and 12, the upper housing 20 is partially cut away and the position of the valve disc 30 is visible.

FIG. 11 is a schematic diagram of the operation of the present invention as a four-way reversing valve (piston rod retracted, valve disc parked in 0 position).

As shown in FIG. 11, at this point, the piston rod 62 is retracted and the valve disc 30 is in the 0 position, and the air stream 120 enters at four-way port one 57-1 and exits at four-way port four 57-4 of the reversing valve 10; the flue gas stream 110 enters from the four-way joint three 57-3 of the reversing valve 10 and flows out from the four-way joint two 57-2, and the specific route is as follows:

air stream 120: -four-way interface one 57-1-four-way interface four 57-4- >;

flue gas stream 110: four-way interface three 57-3, four-way interface two 57-2.

Fig. 12 is a schematic diagram of the operation of the present invention as a four-way reversing valve (piston rod extended, valve disc parked in 90 deg. position).

As shown in FIG. 12, at this point, the piston rod 62 is extended and the valve disc 30 is resting in the 90 position, the air stream 120 enters from the four-way port one 57-1 of the reversing valve 10 and exits from the four-way port two 57-2; the flue gas stream 110 enters from the four-way port three 57-3 of the reversing valve 10 and flows out from the four-way port four 57-4, and the specific route is as follows:

air stream 120: -four-way interface one 57-1-four-way interface two 57-2- >;

flue gas stream 110: four-way interface three 57-3 > four-way interface four 57-4 >.

As can be seen by comparing fig. 11 and 12, by intermittently reciprocating the piston rod 62, the valve disc 30 is intermittently and reciprocally stopped at the 0 deg. position and the 90 deg. position in synchronization, so that the reversing valve 10 has a reversing function, the air stream 120 alternately flows through the four-way port four 57-4 and the four-way port two 57-2 through the reversing valve 10, and simultaneously, the flue gas stream 110 alternately flows through the four-way port two 57-2 and the four-way port four 57-4 through the reversing valve 10 in synchronization. Thereby achieving the purpose of synchronously reversing the air stream 120 and the flue gas stream 110 within the reversing valve 10.

In the reversing valve 10, the elastic force of the spring 3 presses the valve disc 30, so that the sealing surface 36 of the valve disc 30 always clings to the sealing surface 41 of the valve seat 40, and no matter the valve disc 30 is static or rotating, the flue gas flow 110 and the air flow 120 can not leak at the sealing surfaces.

Example 2

Example 2 is an eight-way reversing valve operated by superimposing two reversing valves according to the invention.

By this embodiment, it is specifically described how the two reversing valves 10 of the present invention are stacked to operate as eight-way reversing valves, and the flue gas stream and the air stream are reversed. In this embodiment the flue gas stream is indicated at 110 and the air stream is indicated at 120.

As shown in fig. 13 and 14, the present embodiment is composed of two stacked reversing valves 10, an actuator 60, a left U-shaped pipe 70, and a right U-shaped pipe 71. The two reversing valves 10 are stacked up and down to share the valve shaft 1. The actuator 60 is composed of a cylinder 61, a piston rod 62, a swing arm 63, a support 64 and a shaft fixing assembly 65. The left U-shaped pipe 70 and the right U-shaped pipe 71 are distributed on the left and right sides of the two superimposed reversing valves 10.

As shown in fig. 13 and 14, the cylinder 61 is fixed to the upper surface side of the upper case 20 of the upper reversing valve 10 by a bracket 64, and the common valve shaft 1 is positioned at the center of the upper case 20 of the upper reversing valve 10 by a shaft fixing assembly 65. The swing arm 63 is driven to rotate the common valve shaft 1 by the expansion and contraction of the piston rod 62 in the cylinder 61, and the common valve shaft 1 drives the upper and lower valve plates 30 to synchronously and intermittently reciprocate by 90 degrees.

For convenience of description, in fig. 13 and 14, the combined reversing valve formed by stacking two reversing valves 10 one above the other is designated as an eight-way reversing valve 100, and eight ports of the two reversing valves 10 are also designated.

The four interfaces of the underlying reversing valve 10 are renamed as follows:

the four-way interface one 57-1 is renamed as an eight-way interface one 100-1;

the four-way interface II 57-2 is renamed as an eight-way interface II 100-2;

the four-way interface III 57-3 is renamed as an eight-way interface III 100-3;

the four-way interface IV 57-4 is renamed as eight-way interface IV 100-4;

the four ports of the upper reversing valve 10 are renamed as follows:

the four-way interface one 57-1 is renamed as eight-way interface five 100-5;

the four-way interface II 57-2 is renamed as an eight-way interface six 100-6;

the four-way interface III 57-3 is renamed as an eight-way interface seven 100-7;

the four-way interface IV 57-4 is renamed as eight-way interface eight 100-8;

two ends of the left U-shaped pipe 70 are respectively connected with the eight-way joint four 100-4 and the eight-way joint eight 100-8.

Two ends of the right U-shaped pipe 71 are respectively connected with an eight-way joint two 100-2 and an eight-way joint six 100-6.

In fig. 13 and 14, the upper housing 20 is partially cut away to reveal the position of the upper and lower valve discs 30.

Fig. 13 is a schematic diagram of the operation of two reversing valves of the present invention stacked as an eight-way reversing valve (piston rod retracted, valve disc parked in 0 deg.).

At this point, as shown in fig. 13, the piston rod 62 is retracted, the valve disc 30 is in the 0 position, the air stream 120 flows through the left U-shaped tube 70, the flue gas stream 110 flows through the right U-shaped tube 71, and the specific route is as follows:

air stream 120: -eight-way interface one 100-1-eight-way interface four 100-4-left U-shaped tube 70-eight-way interface eight 100-8-eight-way interface five 100-5.

Flue gas stream 110: -eight-way interface seven 100-7-eight-way interface six 100-6-right U-shaped tube 71-eight-way interface two 100-2-eight-way interface three 100-3.

Fig. 14 is a schematic diagram of the operation of two reversing valves of the present invention stacked as an eight-way reversing valve (piston rod extended, valve disc stopped at 90 deg.).

At this point, as shown in fig. 14, the piston rod 62 is extended and the valve disc 30 is in the 90 position, the flue gas stream 110 flows through the left U-shaped tube 70, and the air stream 120 flows through the right U-shaped tube 71, as follows:

air stream 120: -eight-way interface one 100-1-eight-way interface two 100-2-right U-shaped tube 71-eight-way interface six 100-6-eight-way interface five 100-5.

Flue gas stream 110: eight-pass interface seven 100-7, > eight-pass interface eight 100-8, > left U-shaped tube 70, > eight-pass interface four 100-4, > eight-pass interface three 100-3, >.

As can be seen by comparing fig. 13 and 14, by intermittent reciprocating expansion and contraction of the piston rod 62, the upper and lower valve discs 30 intermittently reciprocate synchronously in the 0 deg. position and the 90 deg. position, so that the eight-way reversing valve 100 has a reversing function, and the air stream 120 alternately flows through the left U-shaped pipe 70 and the right U-shaped pipe 71 through the eight-way reversing valve 100. Simultaneously, the flue gas stream 110 alternately flows through the right U-shaped tube 71 and the left U-shaped tube 70 via the eight-way reversing valve 100. Thereby achieving the purpose of synchronously reversing the air stream 120 and the flue gas stream 110 within the eight-way reversing valve 100.

In the eight-way directional valve 100, the elastic force of the spring 3 presses the valve disc 30, so that the sealing surface 36 of the valve disc 30 always clings to the sealing surface 41 of the valve seat 40, and no matter the valve disc 30 is static or rotating, the flue gas stream 110 and the air stream 120 can not leak at the sealing surfaces.

In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Claims (7)

1. A reversing valve, characterized in that: the reversing valve is a four-way reversing valve or the superposition of more than 2 four-way reversing valves, and the four-way reversing valve comprises an upper shell, a lower shell, a valve disc, a valve seat, a valve shaft and a spring, wherein the valve disc is arranged on the valve seat, end face sealing is arranged between the valve disc and the valve seat, the valve disc is always clung to the valve seat under the action of the spring, and the valve disc can rotate in a 90-degree reciprocating manner;

the upper shell is cylindrical, the bottom of the upper shell is open and connected with the lower shell, the top of the upper shell is closed except the shaft hole, and the side wall of the upper shell is free of interfaces;

the lower shell is cylindrical, the bottom is closed, the top opening is connected with the valve seat and the upper shell, and the side wall is provided with four connectors; the lower shell is internally provided with four partition boards and a shaft sleeve to divide the internal space into four compartments which are not communicated, the side wall of each compartment is provided with an interface, and the top of each compartment is provided with an equal-diameter through hole of a valve seat;

the valve seat is disc-shaped, the upper surface of the valve seat is a sealing surface, the valve seat is provided with four equal-diameter through holes with the circle centers on the same circumference except the shaft hole, the four equal-diameter through holes are uniformly distributed at intervals of 90 degrees, and the hole diameter of each equal-diameter through hole is smaller than or equal to 0.5 times of the hole spacing between two adjacent equal-diameter through holes;

the valve disc consists of a chassis, a channel pipe A and a channel pipe B, wherein the lower surface of the chassis is a sealing surface, the channel pipe A and the channel pipe B are positioned on the upper surface of the chassis, the channel pipe A and the channel pipe B are completely identical, the chassis is disc-shaped, four equal-diameter through holes with the circle centers on the same circumference are uniformly distributed on the chassis except for a shaft hole and a key slot at intervals of 90 degrees, the diameters of the four equal-diameter through holes on the valve seat are identical and correspond to the diameters of the circles with the circle centers of the four equal-diameter through holes on the valve seat one by one, the diameters of the four equal-diameter through holes on the chassis are also identical, the diameters of the circles with the circle centers of the four equal-diameter through holes on the valve seat are ordered in a anticlockwise direction, the four equal-diameter through holes of the chassis are in sequence a chassis hole I, a chassis hole II, a chassis hole III and a chassis hole IV, and the channel pipe B is communicated with the chassis hole III and the chassis hole IV on the upper surface of the chassis;

the spring is sleeved outside the valve shaft between the upper shell and the valve disc.

2. A reversing valve according to claim 1, characterized in that: the valve disc is arranged on the valve seat, the lower surface of the chassis of the valve disc is clung to the upper surface of the valve seat, the valve disc is connected with the valve shaft into a whole through the shaft hole and the key groove, the valve shaft is synchronously operated, the spring is sleeved outside the valve shaft between the upper shell and the valve disc, and the elastic force of the spring compresses the valve disc, so that the valve disc and the valve seat form end face sealing.

3. A reversing valve according to claim 1, characterized in that: the A channel pipe of the valve disc is a 180-degree bent pipe.

4. A reversing valve according to claim 1, characterized in that: the cross section of the A channel pipe of the valve disc is inverted U-shaped, square or trapezoid.

5. A reversing valve according to claim 1, characterized in that: the valve seat is made of composite material.

6. A reversing valve according to claim 1, characterized in that: the reversing valve is formed by superposing two four-way valves, so that an eight-way valve is formed.

7. A reversing valve according to claim 5, characterized in that: the valve seat is made of a composite material of a metal plate and a fluoroplastic plate.