Multi-channel rotary valve for pressure swing adsorption

Abstract

The utility model relates to the technical field of pressure swing adsorption auxiliary equipment, and provides a multi-channel rotary valve for pressure swing adsorption, which comprises an upper valve and a lower valve, the upper valve comprises an upper valve body and an upper valve core, the lower valve comprises a lower valve body and a lower valve core, the upper valve core is connected with the lower valve core through a rotating shaft, and the rotating shaft is connected with a driving mechanism for driving the rotating shaft to rotate. A plurality of pressure equalizing holes are formed in the top face of the upper valve element in the circumferential direction, every two pressure equalizing holes form a group, the pressure equalizing holes in each group are communicated through pressure equalizing channels in the upper valve element, adjusting holes with the same number as the pressure equalizing channels are formed in the bottom face of the upper valve element, the adjusting holes are communicated with the pressure equalizing channels in a one-to-one correspondence mode, and adjusting plungers are connected into the adjusting holes through threads. The flow of the pressure equalizing channel is changed by changing the shielding degree of the pressure equalizing channel by the adjusting plunger. According to the utility model, the shielding degree of the regulating plunger to the pressure equalizing channel is changed by screwing the regulating plunger, so that the flow channel area of the pressure equalizing channel can be changed, and the purpose of changing the flow of the pressure equalizing channel is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure swing adsorption auxiliary equipment, in particular to a multi-channel rotary valve used for pressure swing adsorption. Background Art

[0002] Pressure Swing Adsorption (PSA) is a method of separating gases by using the difference in the amount of gas adsorbed on an adsorbent at different pressures. This technology has been widely used in the fields of gas drying and purification, gas separation, and purification, especially in small and medium-scale air separation, nitrogen production, and oxygen production, as well as process gas purification.

[0003] In order to solve the problems of a large number of control valves and a complex control process in the traditional pressure swing adsorption process, in the prior art, for example, in patent technologies with publication numbers "CN112892153A", "CN113637508A", "CN210978624U", etc., a multi-channel rotary valve is used to replace several valves in the traditional pressure swing adsorption process. The multi-channel rotary valve mainly includes an upper valve, a lower valve and a driving mechanism for driving the two to rotate, wherein the upper valve is provided with a corresponding number of upper connecting pipes according to the number of adsorption towers, and the upper connecting pipes are connected to the top gas ports of each adsorption tower in a one-to-one correspondence, and the lower valve is provided with a corresponding number of lower connecting pipes according to the number of adsorption towers, and the lower connecting pipes are connected to the bottom gas ports of each adsorption tower in a one-to-one correspondence, wherein, in order to balance the pressure of the two towers working successively, a plurality of equalizing pressure channels are provided in the upper valve, and the equalizing pressure channels are connected to the upper connecting pipes corresponding to the two towers.

[0004] The flow rate of the pressure equalizing channel will have more or less influence on various parameters in the adsorption process (such as adsorption efficiency, energy consumption, etc.). However, in the prior art, the flow rate of the pressure equalizing channel is fixed after the valve is manufactured, and it is difficult to adjust according to the actual situation in the production process. Therefore, how to adjust the flow rate of each pressure equalizing channel is a technical problem that needs to be urgently solved in this field. Utility Model Content

[0005] The utility model aims to provide a multi-channel rotary valve for pressure swing adsorption, which can adjust the flow of each pressure equalizing channel.

[0006] The embodiments of the present invention are implemented by the following technical solutions:

[0007] A multi-channel rotary valve for pressure swing adsorption comprises an upper valve and a lower valve, the upper valve comprises an upper valve body and an upper valve core, the lower valve comprises a lower valve body and a lower valve core, the upper valve core and the lower valve core are connected by a rotating shaft, the rotating shaft is connected to a driving mechanism for driving the upper valve core to rotate, a plurality of pressure equalizing holes are arranged on the top surface of the upper valve core in a circumferential direction, and every two pressure equalizing holes form a group, and each group of pressure equalizing holes is connected through a pressure equalizing channel inside the upper valve core, and the bottom surface of the upper valve core is provided with adjusting holes having the same number as the pressure equalizing channels, and the adjusting holes are connected to the pressure equalizing channels in a one-to-one correspondence, and an adjusting plunger is threadedly connected in the adjusting hole to change the flow of the pressure equalizing channel by changing the degree of blocking of the pressure equalizing channel by the adjusting plunger.

[0008] Optionally, the major diameter of the thread of the regulating plunger is greater than the diameter of the pressure equalizing channel.

[0009] Optionally, the adjustment hole runs through both sides of the pressure equalizing channel.

[0010] Optionally, the upper valve body includes an upper outer valve sleeve and an upper sealing valve sleeve, the upper sealing valve sleeve is connected to the upper outer valve sleeve by fasteners, and both ends of the upper valve core are connected to the upper outer valve sleeve by bearings; a plurality of sealing rings are provided on the contact surface between the upper valve core and the upper sealing valve sleeve.

[0011] Optionally, the side wall of the upper valve core is provided with a plurality of upper outer steps, and the inner wall of the upper sealing valve sleeve is provided with a plurality of upper inner steps matching with the upper outer steps.

[0012] Optionally, the upper sealing valve sleeve is made of polytetrafluoroethylene.

[0013] Optionally, the lower valve body includes a lower outer valve sleeve and a lower sealing valve sleeve, the lower sealing valve sleeve is connected to the lower outer valve sleeve by fasteners, and both ends of the lower valve core are connected to the lower outer valve sleeve by bearings; a plurality of sealing rings are provided on the contact surface between the lower valve core and the lower sealing valve sleeve.

[0014] Optionally, the side wall of the lower valve core is provided with a plurality of lower outer steps, and the inner wall of the lower sealing valve sleeve is provided with a plurality of lower inner steps matching with the lower outer steps.

[0015] Optionally, the lower sealing valve sleeve is made of polytetrafluoroethylene.

[0016] The technical solution of this utility model has at least the following advantages and beneficial effects: In this utility model, the bottom surface of the upper valve core is provided with an adjustment hole connected to the pressure equalizing channel, and an adjustment plunger is connected to the adjustment hole through a thread. When in use, the flow area of ​​the pressure equalizing channel can be changed by twisting the adjustment plunger to change the degree of blocking the pressure equalizing channel, thereby achieving the purpose of changing the flow of the pressure equalizing channel. In addition, online adjustment can also be achieved, that is, without stopping the machine, the upper valve core can be adjusted by rotating the clearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the structure of a multi-channel rotary valve for pressure swing adsorption provided by the utility model;

[0019] Figure 2 is a cross-sectional view of the upper valve;

[0020] Figure 3 It is a structural schematic diagram of the upper valve core;

[0021] Figure 4 It is a top view of the upper valve core;

[0022] Figure 5 for Figure 4 AA section view;

[0023] Figure 6 for Figure 4 The state diagram of the adjusting plunger when it is assembled;

[0024] Figure 7 is a cross-sectional view of the lower valve;

[0025] Icon: 1-upper valve, 101-upper outer valve sleeve, 102-upper sealing valve sleeve, 103-upper valve core, 1031-pressure equalizing hole, 1032-pressure equalizing channel, 1033-adjusting hole, 104-upper connecting pipe, 2-lower valve, 201-lower outer valve sleeve, 202-lower sealing valve sleeve, 203-lower valve core, 3-rotating shaft, 4-driving mechanism, 6-adjusting plunger, 7-upper mounting plate, 8-lower mounting plate, 9-frame. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the present invention, it should be noted that if the terms "center", "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the product of the application is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] refer to Figure 1 A multi-channel rotary valve for pressure swing adsorption includes an upper valve 1 and a lower valve 2. The upper valve 1 includes an upper valve 1 body and an upper valve 1 core. The lower valve 2 includes a lower valve 2 body and a lower valve 2 core. The upper valve 1 core and the lower valve 2 core are connected by a rotating shaft 3. The rotating shaft 3 is connected to a driving mechanism 4 for driving the rotation thereof. The driving mechanism 4 includes a motor and a reducer. In practical applications, the top of the upper valve 1 is connected to an upper mounting plate 7, which is connected to a frame 9. The top of the lower valve 2 is connected to a lower mounting plate 8, which is connected to a frame 9. It should be understood that the above content is prior art. Where not described in detail, the setting method of the prior art or the conventional method of the user can be adopted. The present application has made the following improvements on this.

[0031] refer to Figure 2 and Figure 7 The upper valve 1 body includes an upper outer valve sleeve 101 and an upper sealing valve sleeve 102, the upper sealing valve sleeve 102 is connected to the upper outer valve sleeve 101 by fasteners (such as bolts and screws), and the two ends of the upper valve 1 core are connected to the upper outer valve sleeve 101 by bearings; the lower valve 2 body includes a lower outer valve sleeve 201 and a lower sealing valve sleeve 202, the lower sealing valve sleeve 202 is connected to the lower outer valve sleeve 201 by fasteners (such as bolts and screws), and the two ends of the lower valve 2 core are connected to the lower outer valve sleeve 201 by bearings. In this embodiment, the bearing is a thrust tapered roller bearing, that is, the roller is tilted, and the inner and outer rings are inclined. On the one hand, the axis deviation can be adjusted, and on the other hand, tightening helps to seal more tightly.

[0032] The contact surface between the upper valve core 1 and the upper sealing valve sleeve 102 is provided with a plurality of sealing rings to ensure the sealing between the upper valve core 1 and the upper sealing valve sleeve 102; the contact surface between the lower valve core 2 and the lower sealing valve sleeve 202 is provided with a plurality of sealing rings to ensure the sealing between the lower valve core 2 and the lower sealing valve sleeve 202. It should be understood that in actual applications, annular grooves for installing sealing rings are provided on the upper valve core 1 and the lower valve core 2.

[0033] In this embodiment, the side wall of the upper valve core 1 is provided with a plurality of upper outer steps, and the inner wall of the upper sealing valve sleeve 102 is provided with a plurality of upper inner steps that match the upper outer steps; the side wall of the lower valve core 2 is provided with a plurality of lower outer steps, and the inner wall of the lower sealing valve sleeve 202 is provided with a plurality of lower inner steps that match the lower outer steps. That is, the upper valve core 1, the upper sealing valve sleeve 102, the lower valve core 2 and the lower sealing valve sleeve 202 are all stepped. Such a configuration increases the contact area between the upper valve core 1 and the upper seal, and the contact area between the lower valve core 2 and the lower seal, forming a labyrinth seal and improving the sealing performance. In addition, it is easy to understand that in actual applications, in order to ensure the sealing effect, sealing rings can be provided on the axial side and the radial side of each step, and at the same time, sealing rings are also provided on the upper and lower end faces of the upper valve core 1 and the lower valve core 2.

[0034] The upper sealing valve sleeve 102 and the lower sealing valve sleeve 202 are both made of polytetrafluoroethylene, which has an extremely low friction coefficient, so that the rotation resistance of the upper valve core 1 and the lower valve core 2 is extremely small.

[0035] In the prior art, the top surface of the upper valve core 1 is provided with a plurality of equalizing pressure holes 1031 along the circumferential direction, and each two equalizing pressure holes 1031 form a group, and each group of equalizing pressure holes 1031 is connected through the equalizing pressure channel 1032 inside the upper valve core 1. It should be understood that the equalizing pressure holes 1031 can be connected to the upper connecting pipe 104 at the top of the upper valve 1 in a one-to-one correspondence, and after the gas ports at the tops of the two adsorption towers are connected to the corresponding two upper connecting pipes 104, the pressure balance of the two towers can be achieved through the equalizing pressure channel 1032. The present application has made the following improvements on this basis.

[0036] refer to Figure 3-6 The bottom surface of the upper valve core 1 is provided with the same number of adjustment holes 1033 as the pressure equalizing channels 1032. The adjustment holes 1033 are connected to the pressure equalizing channels 1032 one by one. The adjustment holes 1033 are connected with the adjustment plungers 6 by threads. In practical applications, the flow area of ​​the pressure equalizing channels 1032 can be changed by twisting the adjustment plungers 6 to change the degree of blocking the pressure equalizing channels 1032, thereby achieving the purpose of changing the flow of the pressure equalizing channels 1032. In addition, online adjustment can be achieved, that is, without stopping the machine, the upper valve core 1 can be adjusted by rotating the clearance.

[0037] Furthermore, in this embodiment, the major diameter of the thread of the regulating plunger 6 is larger than the diameter of the pressure equalizing channel 1032, and the regulating hole 1033 runs through both sides of the pressure equalizing channel 1032. With such a configuration, when the regulating plunger 6 completely withdraws from the pressure equalizing channel 1032, the flow rate of the pressure equalizing channel 1032 is the largest, and when the regulating plunger 6 completely blocks the pressure equalizing channel 1032, the gas in the pressure equalizing channel 1032 can only flow through the thread gap, and at this time, the flow rate of the pressure equalizing channel 1032 is the smallest.

[0038] It is easy to understand that in actual application, the side wall of the adjusting plunger 6 is provided with a sealing ring groove, and the sealing ring groove is provided with a sealing ring to ensure the gap between the adjusting plunger 6 and the adjusting hole 1033. In addition, the outer end surface of the adjusting plunger 6 can be designed with a structure such as a slot or a plum blossom slot, so that the adjusting plunger 6 can be easily screwed by tools (such as a screwdriver, a socket wrench, etc.).

[0039] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-channel rotary valve for pressure swing adsorption, comprising an upper valve and a lower valve, wherein the upper valve comprises an upper valve body and an upper valve core, and the lower valve comprises a lower valve body and a lower valve core, wherein the upper valve core and the lower valve core are connected by a rotating shaft, and the rotating shaft is connected to a driving mechanism for driving the rotation thereof, wherein a plurality of pressure equalizing holes are arranged on the top surface of the upper valve core along the circumferential direction, wherein every two pressure equalizing holes form a group, and each group of pressure equalizing holes is connected through a pressure equalizing channel inside the upper valve core, wherein the pressure equalizing holes are connected to each other through a pressure equalizing channel inside the upper valve core, and ... The bottom surface of the upper valve core is provided with adjusting holes with the same number as the pressure equalizing channels. The adjusting holes are connected to the pressure equalizing channels one by one. An adjusting plunger is threadedly connected in the adjusting hole to change the flow of the pressure equalizing channel by changing the degree of blocking of the pressure equalizing channel by the adjusting plunger.

2. The multi-channel rotary valve for pressure swing adsorption according to claim 1, characterized in that: The major diameter of the thread of the regulating plunger is larger than the diameter of the pressure equalizing channel.

3. The multi-channel rotary valve for pressure swing adsorption according to claim 2, characterized in that: The adjustment holes run through both sides of the pressure equalizing channel.

4. The multi-channel rotary valve for pressure swing adsorption according to any one of claims 1 to 3, characterized in that: The upper valve body comprises an upper outer valve sleeve and an upper sealing valve sleeve. The upper sealing valve sleeve is connected to the upper outer valve sleeve by fasteners. Both ends of the upper valve core are connected to the upper outer valve sleeve by bearings. The contact surface between the upper valve core and the upper sealing valve sleeve is provided with a plurality of sealing rings.

5. The multi-channel rotary valve for pressure swing adsorption according to claim 4, characterized in that: The side wall of the upper valve core is provided with a plurality of upper outer steps, and the inner wall of the upper sealing valve sleeve is provided with a plurality of upper inner steps matched with the upper outer steps.

6. The multi-channel rotary valve for pressure swing adsorption according to claim 4, characterized in that: The upper sealing valve sleeve is made of polytetrafluoroethylene.

7. The multi-channel rotary valve for pressure swing adsorption according to any one of claims 1 to 3, characterized in that: The lower valve body comprises a lower outer valve sleeve and a lower sealing valve sleeve. The lower sealing valve sleeve is connected to the lower outer valve sleeve by fasteners. Both ends of the lower valve core are connected to the lower outer valve sleeve by bearings. The contact surface between the lower valve core and the lower sealing valve sleeve is provided with a plurality of sealing rings.

8. The multi-channel rotary valve for pressure swing adsorption according to claim 7, characterized in that: The side wall of the lower valve core is provided with a plurality of lower outer steps, and the inner wall of the lower sealing valve sleeve is provided with a plurality of lower inner steps matched with the lower outer steps.

9. The multi-channel rotary valve for pressure swing adsorption according to claim 7, characterized in that: The lower sealing valve sleeve is made of polytetrafluoroethylene.

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