Reversing valve suitable for booster pump and booster pump

Abstract

The invention provides a reversing valve suitable for a booster pump and the booster pump, and the reversing valve comprises a valve body, a reversing driving piece, a sealing piece and an air valve sliding block. The valve body is provided with an air inlet cavity, a first driving branch, a second driving branch, an exhaust channel and an air inlet, and the air inlet communicates with the air inlet cavity to feed a first driving medium. And the reversing driving piece is driven by the second driving medium to move. The sealing piece is detachably arranged in the driving cavity, the sealing piece is provided with a first through hole in butt joint with the first driving branch, a second through hole in butt joint with the second driving branch and a third through hole located between the first through hole and the second through hole, and the third through hole is in butt joint with the exhaust channel; the air valve sliding block is connected with the reversing driving piece and located in the driving cavity, the first side of the air valve sliding block is provided with a communicating cavity and makes surface contact with the sealing piece, and the air valve sliding block can move between the first position and the second position relative to the sealing piece along with the reversing driving piece.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of booster pumps, in particular, to a reversing valve suitable for a booster pump and the booster pump. BACKGROUND

[0002] The booster pump comprises a cylinder part and a reversing valve part, the cylinder part comprises a driving cylinder and a booster cylinder, a piston in the driving cylinder reciprocates under the action of a driving medium to output fluid in the booster cylinder at a high pressure. The reversing valve is used to change the direction of the driving medium entering the driving cylinder to realize the reciprocation of the piston in the driving cylinder.

[0003] The reversing valve has a valve sleeve and a valve core, and the valve core and the valve sleeve are in precise fit to realize sealing, and there is a gap with a size of less than 0.008 mm between the valve core and the valve sleeve. The two ends of the valve core also have driving media, and the valve core moves under the pressure of the driving media, and the movement of the valve core can change the direction of the driving medium entering the driving cylinder.

[0004] In use, the existing booster pump may be stuck due to impurities in the air and the like, and the valve core and the valve sleeve cannot move relative to each other; in a low-temperature environment, the valve core and the valve sleeve may be stuck due to icing in the reversing valve, and ice appears between the valve core and the valve sleeve, which causes the booster pump to fail to work normally. SUMMARY

[0005] The purpose of the present application is to provide a reversing valve suitable for a booster pump and the booster pump, which can be used in a low-temperature environment and is not prone to the situation that the structure in the reversing valve is stuck due to ice, causing the booster pump to fail to work normally.

[0006] Embodiments of the present application are implemented as follows:

[0007] In a first aspect, the embodiments of the present application provide a reversing valve suitable for a booster pump, comprising a valve body, a reversing driving member, a sealing sheet and a gas valve slider.

[0008] The valve body has an air inlet cavity, a first driving branch, a second driving branch, an exhaust passage and an air inlet, and the air inlet communicates with the air inlet cavity to send in a first driving medium.

[0009] The reversing driving member is driven by a second driving medium to move, the reversing driving member is installed in the valve body, and the reversing driving member is further provided with a first sealing ring, the first sealing ring divides the air inlet cavity into a driving cavity for the first driving medium to pass through and a first pilot cavity for the second driving medium to pass through, so as to separate the first driving medium from the second driving medium;

[0010] A sealing sheet is detachably arranged in the driving cavity, the sealing sheet has a first through hole for connecting with the first driving branch, a second through hole for connecting with the second driving branch, and a third through hole between the first through hole and the second through hole, the third through hole is connected with the exhaust passage;

[0011] A valve slider is connected with the reversing driving member, the valve slider is arranged in the driving cavity, a first side of the valve slider has a communication cavity and is in surface contact with the sealing sheet, the valve slider can move relative to the sealing sheet between a first position and a second position;

[0012] In the first position, the communication cavity connects the first through hole with the third through hole, the communication cavity is not connected with the second through hole, and the second through hole is connected with the driving cavity, so that the first driving medium in the driving cavity enters the second driving branch; in the second position, the communication cavity connects the second through hole with the third through hole, the communication cavity is not connected with the first through hole, and the first through hole is connected with the driving cavity, so that the first driving medium in the driving cavity enters the first driving branch.

[0013] In the reversing valve provided by the above technical solution, the valve slider can move between the first position and the second position, in the first position, the driving cavity, the first through hole and the first driving branch are connected to form a passage, the first driving medium in the driving cavity can be output to the outside, the exhaust passage is connected with the second driving branch through the communication cavity; in the second position, the driving cavity, the second through hole and the second driving branch are connected to form a passage, the first driving medium in the driving cavity can be output to the outside, the exhaust passage is connected with the first driving branch through the communication cavity. The reversing valve provided by the above technical solution can be used in a driving booster pump to make the piston of the booster pump reciprocate, when the valve slider is in the first position, the first driving medium is provided from the first side of the piston through the first driving branch, and the first driving medium on the second side of the piston is pushed out from the second driving branch by the piston; when the valve slider is in the second position, the first driving medium is provided from the second side of the piston through the second driving branch, and the first driving medium on the first side of the piston is pushed out from the first driving branch by the piston.

[0014] The reversing valve provided by the technical scheme has the following advantages. The driving cavity and the pilot cavity are separated by the first sealing ring. The sealing mode makes the gap between the valve body and the reversing driving member larger, and the two are not easily stuck by frost generated in a low-temperature environment and unable to move relative to each other. The gas valve slider and the sealing sheet are in surface contact, and theoretically, there is no gap between the two. Therefore, frost generated in a low-temperature environment does not appear between the gas valve slider and the sealing sheet, and the gas valve slider is not easily stuck by frost and unable to move. The reversing valve is suitable for a booster pump. The piston in the booster pump needs to continuously move back and forth. Therefore, the gas valve slider continuously moves back and forth on the sealing sheet. The sealing sheet is detachably arranged in the driving cavity, so that the sealing sheet can be replaced after being worn out.

[0015] In combination with the first aspect, in some optional embodiments, the sealing sheet and the gas valve slider are both ceramic structural members.

[0016] In the technical scheme, the ceramic material has good wear resistance, so that the sealing sheet and the gas valve slider have a long service life.

[0017] In combination with the first aspect, in some optional embodiments, the reversing driving member is further provided with a second sealing ring. The second sealing ring separates a second pilot cavity from the gas inlet cavity. The driving cavity is located between the first pilot cavity and the second pilot cavity. The first pilot cavity and the second pilot cavity are used to contain a second driving medium to drive the reversing driving member and the gas valve slider to move between the first position and the second position.

[0018] In the technical scheme, the first sealing ring and the second sealing ring separate the first pilot cavity and the second pilot cavity in the gas inlet cavity. The second driving medium is alternately introduced into the first pilot cavity and the second pilot cavity, so that the reversing driving member can move back and forth.

[0019] In combination with the first aspect, in some optional embodiments, the valve body is further provided with a first pilot branch and a second pilot branch. A first end of the first pilot branch is in communication with the first pilot cavity, and a second end of the first pilot branch is located on the surface of the valve body. The first pilot branch is used to introduce the second driving medium into the first pilot cavity to drive the reversing driving member to move to the second position. A first end of the second pilot branch is in communication with the second pilot cavity, and a second end of the second pilot branch is located on the surface of the valve body. The second pilot branch is used to introduce the second driving medium into the second pilot cavity to drive the reversing driving member to move to the first position.

[0020] In some optional embodiments of the first aspect, the valve body is further provided with a pilot device, the pilot device comprising a mounting portion and a movable portion, the movable portion being configured to extend into the first pilot branch to cut off the first pilot branch and prevent the second driving medium from entering the first pilot chamber, and / or the movable portion being configured to extend into the second pilot branch to cut off the second pilot branch and prevent the second driving medium from entering the second pilot chamber.

[0021] In the above technical solution, the pilot device provided in the valve body can prevent the second driving medium from entering the first pilot chamber and / or the second pilot chamber, so that the reversing driving member cannot realize reciprocating motion. Therefore, the booster pump provided with the reversing valve of the above technical solution can cut off the first pilot branch or the second pilot branch by the pilot device, so that the piston of the booster pump cannot realize reciprocating motion, and thus the output of the pressurized fluid is stopped.

[0022] In some optional embodiments of the first aspect, the diameters of the first pilot branch and the second pilot branch are 2.5-5 mm, preferably 3-3.5 mm.

[0023] In the above technical solution, the size of the pilot branch is small, and the pilot device is used to prevent the second driving medium in the first pilot branch and the second pilot branch, so as to control whether the reversing valve works, and the cost is lower.

[0024] In some optional embodiments of the first aspect, the reversing driving member is a plastic structural member, the valve body is provided with a self-lubricating plastic shaft sleeve, the first sealing ring is arranged at the first end of the reversing driving member and in contact with one of the shaft sleeves, and the second sealing ring is arranged at the first end of the reversing driving member and in contact with one of the shaft sleeves.

[0025] In the above technical solution, the reversing driving member is a plastic structural member, which is less likely to freeze compared with a metal material, and can further reduce the problem that ice and snow cause the reversing driving member to be stuck with the valve body. The first sealing ring and the second sealing ring are in contact with the self-lubricating plastic shaft sleeve in the valve body, so that the first sealing ring and the second sealing ring have a long service life and are less likely to fail.

[0026] In some optional embodiments of the first aspect, one end of the reversing driving member is provided with a spring, one end of the spring is connected with the valve body, the other end of the spring is connected with the reversing driving member, and the spring is used to move the reversing driving member to the first position or the second position.

[0027] In the technical solution, the spring is arranged, so that when the reversing valve stops working, the reversing driving member moves to the first position or the second position under the action of the spring, and the reversing valve can work normally again.

[0028] In combination with the first aspect, in some optional embodiments, an end of the reversing driving member is provided with a mounting hole, the spring is arranged in the first pilot cavity or the second pilot cavity, one end of the spring abuts against the valve body, and the other end of the spring is located in the mounting hole and abuts against the bottom of the mounting hole.

[0029] In the technical solution, the mounting hole is arranged at the end of the reversing driving member, and the spring is arranged in the mounting hole, so that the deformation of the spring is constrained by the hole wall of the mounting hole, and the spring can work normally.

[0030] In combination with the first aspect, in some optional embodiments, the air valve slider comprises a pressure bearing surface on the side opposite to the sealing sheet, and the contact area of the pressure bearing surface with the reversing driving member is smaller than the area of the pressure bearing surface. In addition, a compression state elastic member is arranged between the air valve slider and the reversing driving member, and the air valve slider is configured to be in contact with the sealing sheet under the action force of the elastic member.

[0031] In the technical solution, since the contact area of the pressure bearing surface with the reversing driving member is smaller than the area of the pressure bearing surface, part of the pressure bearing surface is exposed to the first driving medium, so that the air valve slider can be pressed against the sealing sheet under the pressure of the first driving medium, and the sealing property between the air valve slider and the sealing sheet can be improved. The compression state elastic member is arranged between the air valve slider and the reversing driving member, and the air valve slider is pressed against the sealing sheet by the elastic member, so that the sealing property between the air valve slider and the sealing sheet can be improved.

[0032] In the second aspect, the application provides a reversing valve suitable for a booster pump, comprising a valve body, a reversing driving member, an air valve slider and a sealing sheet.

[0033] The valve body has an air inlet cavity, a first driving branch, a second driving branch, an exhaust passage and an air inlet, and the first driving branch and the second driving branch are used to discharge the first driving medium entering the air inlet cavity from the air inlet.

[0034] The reversing driving member is arranged in the air inlet cavity.

[0035] The sealing sheet is arranged in the air inlet cavity, and the sealing sheet has a first through hole butting against the first driving branch, a second through hole butting against the second driving branch and a third through hole between the first through hole and the second through hole, and the third through hole butts against the exhaust passage.

[0036] The air valve slider is connected with the reversing driving member, and is located in the air inlet cavity. A first side of the air valve slider has a communication cavity and is in surface contact with the sealing sheet.

[0037] The driving assembly is connected with the reversing driving member and is installed on the valve body to drive the reversing driving member to reciprocate the air valve slider between the first position and the second position.

[0038] In the first position, the communication cavity communicates the first through hole with the third through hole, and the communication cavity is not communicated with the second through hole. The second through hole is communicated with the air inlet cavity to enable the first driving medium in the air inlet cavity to enter the second driving branch. In the second position, the communication cavity communicates the second through hole with the third through hole, and the communication cavity is not communicated with the first through hole. The first through hole is communicated with the air inlet cavity to enable the first driving medium in the air inlet cavity to enter the first driving branch.

[0039] In combination with the second aspect, in some optional embodiments, a distance between the reversing driving member and an inner wall of the air inlet cavity is not less than 0.008 mm.

[0040] In a third aspect, the application provides a booster pump, which comprises a driving cylinder unit and the reversing valve provided in the first aspect or the second aspect. The driving cylinder unit comprises a first cylinder body and a first piston located in the first cylinder body. The first piston is configured to reciprocate between a first end and a second end of the first cylinder body.

[0041] The first cylinder body is provided with a third driving branch and a fourth driving branch. A first end of the third driving branch is communicated with an inside of the first cylinder body from the first end of the first cylinder body, and a second end of the third driving branch is butted against the first driving branch. The first driving branch is used to send the first driving medium into the first cylinder body from the first end of the first cylinder body through the third driving branch. A first end of the fourth driving branch is communicated with the inside of the first cylinder body from the second end of the first cylinder body, and a second end of the fourth driving branch is butted against the second driving branch. The second driving branch is used to send the first driving medium into the first cylinder body from the second end of the first cylinder body through the fourth driving branch.

[0042] In the above technical solution, when the air valve slider in the reversing valve is in the first position, the first driving branch can provide the first driving medium from the first end of the first cylinder body to the inside of the first cylinder body through the third driving branch, the first driving medium pushes the first piston to move towards the second end of the first cylinder body from the first side of the first piston, and the first driving medium on the second side of the first piston can be discharged through the fourth driving branch, the second driving branch and the exhaust passage. When the air valve slider in the reversing valve is in the second position, the second driving branch can provide the first driving medium from the second end of the first cylinder body to the inside of the first cylinder body through the fourth driving branch, the first driving medium pushes the first piston to move towards the first end of the first cylinder body from the second side of the first piston, and the first driving medium on the first side of the first piston can be discharged through the third driving branch, the second driving branch and the exhaust passage.

[0043] In a fourth aspect, the application provides a booster pump, comprising a driving cylinder unit and the reversing valve provided in the first aspect, the driving cylinder unit comprising a first cylinder body and a first piston located in the first cylinder body, the first piston being configured to reciprocate between a first end and a second end of the first cylinder body;

[0044] The first cylinder body is provided with a third pilot branch, a fourth pilot branch, a first normally closed switch and a second normally closed switch, the first switch being used to cut off the third pilot branch in the closed state, and the second switch being used to cut off the fourth pilot branch in the closed state;

[0045] The first end of the third pilot branch is in communication with the second end of the first pilot branch, and the first end of the fourth pilot branch is in communication with the second end of the second pilot branch;

[0046] The first cylinder body is configured such that the first piston can open the first switch when moving to the first end of the first cylinder body, so that the second driving medium enters the first pilot cavity through the third pilot branch and the first pilot branch, and pushes the reversing driving member to move towards the second position; and the first piston can open the second switch when moving to the second end of the first cylinder body, so that the second driving medium enters the second pilot cavity through the fourth pilot branch and the second pilot branch, and pushes the reversing driving member to move towards the first position.

[0047] In the technical solution, the second driving medium in the first pilot chamber and the second pilot chamber drives the reversing driving member to move. When the first piston moves to the first end of the first cylinder body, the first switch is opened, so that the second driving medium enters the first pilot chamber, and the reversing driving member moves to the second position. When the reversing driving member is in the second position, the first driving medium in the driving chamber enters the inside of the first cylinder body through the first driving branch and the third driving branch from the first end of the first cylinder body, and the first driving medium pushes the first piston to move to the second end of the first cylinder body from the first side of the first piston. Similarly, when the first piston moves to the second end of the first cylinder body, the second switch is opened, so that the second driving medium enters the second pilot chamber, and then the reversing driving member moves to the first position, and then the first piston moves to the first end of the first cylinder body. The technical solution can realize uninterrupted automatic operation of the booster pump without the participation of an electric control element, and improves the safety and reliability of the booster pump.

[0048] In combination with the fourth aspect, in some embodiments, the valve body is further provided with a fifth pilot branch and a sixth pilot branch; the fifth pilot branch and the sixth pilot branch are in communication with the gas inlet at the first end and located on the surface of the valve body at the second end;

[0049] The second end of the third pilot branch is in communication with the second end of the fifth pilot branch, and the second end of the fourth pilot branch is in communication with the second end of the sixth pilot branch;

[0050] When the first switch is opened, the driving medium in the driving chamber can enter the first pilot chamber through the fifth pilot branch, the third pilot branch and the first pilot branch in sequence, and push the reversing driving member to move to the second position; when the second switch is opened, the driving medium in the driving chamber can enter the second pilot chamber through the sixth pilot branch, the fourth pilot branch and the second pilot branch in sequence, and push the reversing driving member to move to the first position.

[0051] In the technical solution, the fifth pilot branch and the sixth pilot branch are in communication with the gas inlet, and the first driving medium introduced into the driving chamber through the gas inlet can also enter the first pilot chamber through the fifth pilot branch, the third pilot branch and the first pilot branch, or enter the second pilot chamber through the sixth pilot branch, the fourth pilot branch and the second pilot branch, so as to realize that only one kind of driving medium introduced into the gas inlet can drive the first piston to move and drive the reversing driving member to move.

[0052] In combination with the fourth aspect, in some embodiments, further comprising a first exhaust branch and a second exhaust branch; when the first switch is open, a first end of the first exhaust branch is in communication with the third pilot branch, and when the first switch is closed, the first end opening of the first exhaust branch is closed by the first switch; when the second switch is open, a first end of the second exhaust branch is in communication with the fourth pilot branch, and when the second switch is closed, the first end opening of the second exhaust branch is closed by the second switch; the second ends of the first exhaust branch and the second exhaust branch are in communication with the atmosphere.

[0053] In the above technical solution, the driving medium in the first pilot cavity can be exhausted through the first exhaust branch, so as to facilitate the movement of the reversing driving member and the air valve slider to the first position; the driving medium in the second pilot cavity can be exhausted through the second exhaust branch, so as to facilitate the movement of the reversing driving member and the air valve slider to the second position. BRIEF DESCRIPTION OF DRAWINGS

[0054] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0055] Figure 1 A schematic diagram of a reversing valve with a valve sleeve and a valve core structure in the prior art;

[0056] Figure 2 A schematic diagram of the reversing valve provided by the embodiments of the present application, in which the reversing driving member and the air valve slider are in the first position;

[0057] Figure 3 A schematic diagram of the reversing valve provided by the embodiments of the present application, in which the reversing driving member and the air valve slider are in the second position;

[0058] Figure 4 A schematic diagram of the dead angle position in the reversing valve provided by the embodiments of the present application;

[0059] Figure 5 A schematic diagram of the structure of the valve body in the reversing valve provided by the embodiments of the present application;

[0060] Figure 6 A schematic diagram of the connection of the reversing driving member and the air valve slider in the reversing valve provided by the embodiments of the present application;

[0061] Figure 7 A schematic diagram of the reversing valve provided by the embodiments of the present application, in which an impeller is used as the reversing driving member;

[0062] Figure 8 Schematic diagram of the booster pump provided by the embodiment of the present application;

[0063] Figure 9 Schematic diagram of the first cylinder provided by the embodiment of the present application;

[0064] Figure 10 Schematic diagram of the driving cylinder unit provided by the embodiment of the present application;

[0065] Figure 11 Schematic diagram of the enlarged view of A in FIG. 1; Figure 10 Schematic diagram of the enlarged view of B in FIG. 1;

[0066] Figure 12 Schematic diagram of the first piston triggering the first switch;

[0067] Figure 13 Schematic diagram of the enlarged view of C in FIG. 1; Figure 12

[0068] Schematic diagram of the enlarged view of D in FIG. 1. Figures 14 to 17

[0069] Figure: 100 - reversing valve; 110 - valve body; 111 - air inlet cavity; 1110 - air inlet; 1111 - first pilot cavity; 1112 - second pilot cavity; 1113 - driving cavity; 1121 - first driving branch; 1122 - second driving branch; 113 - exhaust passage; 1141 - first pilot branch; 1142 - second pilot branch; 115 - fifth pilot branch; 116 - sixth pilot branch; 120 - reversing driving member; 121 - first sealing ring; 122 - second sealing ring; 123 - spring; 124 - mounting hole; 125 - first flange; 126 - second flange; 130 - air valve slider; 131 - communication cavity; 140 - sealing sheet; 141 - first through hole; 142 - second through hole; 143 - third through hole; 150 - pilot; 160 - shaft sleeve; 200 - driving cylinder unit; 210 - first cylinder; 211 - first end cover; 2111 - third driving branch; 2112 - third pilot branch; 21121 - first opening; 21122 - second opening; 2113 - blind hole; 2114 - first exhaust branch; 212 - second end cover; 2121 - fourth driving branch; 2122 - fourth pilot branch; 2123 - second exhaust branch; 213 - barrel; 220 - first piston; 231 - first switch; 2311 - third flange; 2312 - fourth flange; 232 - second switch; 230 - second piston; 240 - piston rod; 310 - valve core; 320 - valve sleeve; 321 - through hole. DETAILED DESCRIPTION

[0070] ​In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0071] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0072] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0073] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the application is used, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0074] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0075] In the description of the present application, it should also be noted that unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0076] In the prior art, the two ends of the valve core 310 are provided with pilot air paths to push the valve core 310 to move; the structure of the valve core 310 also participates in forming a driving air path, and a driving medium provided by the driving air path drives the piston to move to pressurize the fluid output by the booster pump; the valve core 310 changes position to realize reversing through the pilot air path, and after the valve core 310 reverses, the path of the driving medium entering the cylinder body of the booster pump can be changed to push the piston in the cylinder body to move from different directions. Therefore, in the prior art, the pilot air paths at the two ends of the valve core 310 need to be separated from the driving air path in which the valve core 310 participates, otherwise air leakage will occur, which will cause the booster pump to fail to work normally, that is, sealing measures need to be taken between the valve core 310 and the valve sleeve 320 to separate the pilot air path from the driving air path.

[0077] In Figure 1 In the prior structure shown in the figure, since the driving air path needs to pass through the valve sleeve 320, a plurality of through holes 321 are provided on the valve sleeve 320. Since the valve core 310 needs to move to realize reversing, the valve core 310 will move relative to the valve sleeve 320, and therefore sealing needs to be performed between the valve core 310 and the valve sleeve 320 to separate the pilot air path that pushes the valve core 310 to move from the driving air path controlled by the valve core 310. However, the through holes 321 on the valve sleeve 320 make it impossible to seal between the valve core 310 and the valve sleeve 320 by a sealing ring, otherwise the sealing ring may be scratched by the through holes 321 on the valve sleeve 320 during movement with the valve core 310, resulting in sealing failure.

[0078] Therefore, in the prior art, since the valve core 310 needs to realize sealing with the valve core 310 and relative movement with the valve sleeve 320 to realize reversing, the valve core 310 and the valve sleeve 320 are precisely matched to realize sealing, that is, the valve core 310 and the valve sleeve 320 have a very small gap, such as Figure 1 As shown in the figure, the single-sided gap between the valve core 310 and the valve sleeve 320 is not more than 0.008 mm. If impurities, frost or other foreign matters appear in the gap, the valve core 310 and the valve sleeve 320 will be stuck, so that the valve core 310 cannot move to realize reversing, correspondingly, the path of the driving medium entering the cylinder body cannot be changed, and thus the direction of the piston cannot be changed, and the booster pump cannot work normally.

[0079] Based on this, the inventors of the present application provide a reversing valve 100 suitable for a booster pump, as shown in Figures 2 to 4 The reversing valve 100 provided by the present application includes a valve body 110, a reversing driving member 120 arranged in the valve body 110, a sealing piece 140 and an air valve slider 130. The booster pump with the reversing valve 100 provided by the present application is as shown in Figure 8As shown, there is a driving cylinder unit 200, which includes a first cylinder body 210 and a first piston 220 in the first cylinder body 210. The first piston 220 moves under the action of the first driving medium provided by the reversing valve 100 and can change the direction of movement under the action of the reversing valve 100.

[0080] like Figure 5 As shown, the valve body 110 has an air inlet cavity 111 and is provided with an air inlet port 1110 connected to the air inlet cavity 111 to feed the first driving medium into the air inlet cavity 111; that is, when no structures such as the reversing driving member 120 are installed in the valve body 110, the cavity that can be filled with the first driving medium and can accommodate the reversing driving member 120 is the air inlet cavity 111. The valve body 110 is also provided with a first drive branch 1121, a second drive branch 1122 and an exhaust channel 113. Similar to the existing reversing valve 100, the first drive branch 1121, the second drive branch 1122 and the exhaust channel 113 are all channel structures arranged in the valve body 110, and have openings at both ends. The first drive branch 1121 and the second drive branch 1122 can output the first drive medium from the valve body 110 to drive the first piston 220 in the booster pump to move; the exhaust channel 113 can discharge the first drive medium pushed out of the cylinder by the first piston 220 when the first piston 220 in the booster pump moves. It should be noted that the directions of the first drive branch 1121, the second drive branch 1122 and the exhaust channel 113 shown in the accompanying drawings are for the purpose of explaining the principle of the reversing valve 100 provided in this application. When implementing the reversing valve 100 provided in this application, the directions of the channel structures such as the first drive branch 1121, the second drive branch 1122 and the exhaust channel 113 can be designed according to actual needs.

[0081] Further, in Figure 5 In the embodiment shown, the valve body 110 includes a cylindrical structure and end caps mounted on both ends of the cylindrical structure, which enclose an air inlet cavity 111. A cylindrical cylindrical structure and two end caps with the same structure can be used to reduce production costs.

[0082] The reversing drive member 120 is driven by the second driving medium to move. The reversing drive member 120 is located in the air inlet cavity 111. Figures 4 to 6As shown, the reversing drive 120 is also provided with a first sealing ring 121. The first sealing ring 121 separates the driving chamber 1113 for the first driving medium to pass through and the first pilot chamber 1111 for the second driving medium to pass through in the air inlet chamber 111, so as to separate the first driving medium from the second driving medium. It is easy to understand that the first sealing ring 121 is located between the inner wall of the valve body 110 and the reversing drive 120, and the first pilot chamber 1111 and the driving chamber 1113 are respectively located on both sides of the first sealing ring 121, and the first sealing ring 121 plays a sealing role to prevent the second driving medium in the first pilot chamber 1111 and the first driving medium in the driving chamber 1113 from mixing with each other through the gap between the reversing drive 120 and the valve body 110. Since this application does not adopt Figure 1 The structure in which the valve core and the valve sleeve move relative to each other realizes reversing, and there is no through hole that will scratch the sealing ring. Therefore, a sealing ring can be used to achieve sealing between the reversing drive 120 and the valve body 110 without the sealing ring being damaged during the movement of the reversing drive.

[0083] like Figures 2 to 4 ,as well as Figure 6 As shown, the sealing plate 140 is located in the driving cavity 1113. The sealing plate 140 has a first through hole 141 connected to the first driving branch 1121, a second through hole 142 connected to the second driving branch 1122, and a third through hole 143 connected to the exhaust channel 113. The third through hole 143 is located between the first through hole 141 and the second through hole 142.

[0084] The air valve slider 130 is connected to the reversing drive 120 so as to move with the reversing drive 120. The air valve slider 130 is located in the drive chamber 1113. The first side of the air valve slider 130 has a connecting chamber 131 and is in surface contact with the sealing plate 140. The air valve slider 130 can move between a first position and a second position relative to the sealing plate 140 along with the reversing drive 120. In some embodiments, in order to facilitate the air valve slider 130 and the reversing drive 120 to stop at the first position and the second position, the air valve slider 130 or the reversing drive 120 is located at the extreme position in the direction of movement at the first position and the second position. Since the second pilot medium is used to drive the reversing drive 120, and the reversing drive 120 then drives the air valve slider 130 to move together, it is preferred that in the first position (such as Figure 2 ) and the second position (as shown Figure 3 As shown), the reversing drive member 120 is located at the extreme position in the direction of movement.

[0085] like Figure 2As shown, in the first position, the communication cavity 131 communicates the first through hole 141 with the third through hole 143, the communication cavity 131 is not communicated with the second through hole 142, and the second through hole 142 is communicated with the driving cavity 1113. Therefore, in the first position, the first driving medium in the driving cavity 1113 can enter the second driving branch 1122 from the second through hole 142. As shown in the figure, Figure 3 As shown, in the second position, the communication cavity 131 communicates the second through hole 142 with the third through hole 143, the communication cavity 131 is not communicated with the first through hole 141, and the first through hole 141 is communicated with the driving cavity 1113. Therefore, in the second position, the first driving medium in the driving cavity 1113 can enter the first driving branch 1121 through the first through hole 141.

[0086] The reversing valve 100 provided in the application can realize reversing by changing the position of the gas valve slider 130 and the reversing driving member 120, and then change the output path of the first driving medium, and by changing the output path of the first driving medium, the function of changing the movement direction of the first piston 220 in the booster pump is realized.

[0087] In the reversing valve 100 provided in the application, the communication cavity 131 of the gas valve slider 130 participates in the construction of the driving gas circuit, and the gas valve slider 130 does not need to be sealed with the valve body 110; the reversing driving member 120 is driven by the second driving medium, so the first sealing ring 121 can be arranged between the reversing driving member 120 and the valve body 110 to play a sealing role, and the first pilot cavity 1111 provided with the second driving medium is separated from the driving cavity 1113 provided with the first driving medium. Compared with the valve core and valve sleeve structure in the prior art, and the valve core needs to realize sealing with the valve core and relative movement with the valve sleeve to realize reversing, in the application, the structure of the gas valve slider 130 and the sealing sheet 140 is adopted, and the valve sleeve in the prior art is not adopted, so the first sealing ring 121 can be adopted to play a sealing role, and the sealing position is between the reversing driving member 120 and the valve body 110, and the reversing function is realized by the movement of the gas valve slider 130 relative to the sealing sheet 140. Reversing and sealing are realized by different structures, so that in the application, the sealing ring can be used to separate the second driving medium for driving reversing from the first driving medium for driving the movement of the first piston 220 between the reversing driving member 120 and the valve body 110. Therefore, the gap between the valve body 110 and the reversing driving member 120 can be relatively large, and the one-sided gap between the reversing driving member 120 and the valve body 110 at the position of the first sealing ring 121 arranged on the reversing driving member 120 can be greater than 0.008mm, so as to avoid the situation that impurities between the valve body 110 and the reversing driving member 120 cause the reversing driving member 120 to be stuck. The gap can be specifically 0.2mm-0.5mm, so as to facilitate the sealing of the first sealing ring 121.

[0088] In the present application, the second driving medium driving the commutating driving member 120 to move can be compressed air or hydraulic oil, and the moisture in the second driving medium can freeze in a low temperature environment. Even if the commutating valve 100 provided by the present application is applied in a low temperature environment such as oil and gas exploitation and petrochemical industry, the frost in the valve body 110 is not easy to jam the commutating driving member 120. Further, since the gas valve slider 130 and the sealing sheet 140 are in surface contact, theoretically, there is no gap between them, therefore, the frost generated in the low temperature environment will not appear between the gas valve slider 130 and the sealing sheet 140, and the gas valve slider 130 is not easy to be jammed by frost and unable to move.

[0089] The present application also provides another commutating valve 100 suitable for a booster pump, which is different from the commutating valve 100 shown in Figure 2 The difference between the commutating valve 100 shown in Figure 7 In the embodiment shown in the present application, a rotatable impeller is used as the commutating driving member 120 to move the gas valve slider 130. The impeller can be driven to rotate by a motor, and specifically, Figure 7 In the embodiment shown in the present application, the commutating valve 100 includes a valve body 110, a commutating driving member 120, a sealing sheet 140, and a gas valve slider 130. The impeller is a plate-shaped or rod-shaped structural member, and the impeller drives the gas valve slider 130 to move between the first position and the second position during rotation. In other embodiments, other forms of commutating driving member 120 can also be used. In the embodiment shown in the present application, Figure 7 In the embodiment shown in the present application, no second driving medium is needed, and therefore, the first sealing ring 121 can not be used to separate the first pilot chamber 1111 and the driving chamber 1113 in the air inlet chamber 111. Of course, the precise fit between the commutating driving member 120 and the valve body 110 is not needed to achieve sealing, and the distance between the commutating driving member 120 and the inner wall of the valve body 110 can be greater than or equal to 0.008 mm to avoid the commutating driving member 120 being jammed. The gap between the commutating driving member 120 and the valve body 110 is large enough to avoid the frost generated in the low temperature environment from causing the commutating driving member 120 to be jammed and unable to move.

[0090] In the commutating valve 100 provided in other embodiments of the present application, a gas cylinder or a hydraulic cylinder can also be used as a driving assembly to push the commutating driving member 120 to move. The cylinder body of the gas cylinder or the hydraulic cylinder is arranged on the valve body 110, and the piston rod extends into the air inlet chamber 111 and is connected with the commutating driving member 120.

[0091] In the embodiment where the cylinder or the liquid cylinder is used as the driving component to drive the reversing driving member 120 to move, the second driving medium is not needed, and thus the sealing ring can not be used to separate the first pilot chamber 1111 and the second pilot chamber 1112 in the air inlet chamber 111. Of course, the sealing by the precise fit is not needed, and the distance between the reversing driving member 120 and the inner wall of the air inlet chamber 111 can be greater than or equal to 0.008 mm to avoid the reversing driving member 120 from being stuck. The gap between the reversing driving member 120 and the valve body 110 is large enough to avoid the ice generated in the low-temperature environment from causing the reversing driving member 120 to be stuck and unable to move.

[0092] When the reversing valve 100 provided in the present application is applied to the booster pump, the air valve slider 130 in the reversing valve 100 needs to move back and forth between the first position and the second position, which can cause the sealing sheet 140 to be worn. Therefore, in some embodiments, the sealing sheet 140 is detachably connected to the driving chamber 1113 to facilitate the replacement of the sealing sheet 140.

[0093] Further, in some embodiments, the sealing sheet 140 and the air valve slider 130 are both ceramic structural members to improve the wear resistance of the air valve slider 130 and the sealing sheet 140, thereby prolonging the service life of the sealing sheet 140 and the air valve slider 130.

[0094] In some embodiments, as shown in Figures 4 to 6 the reversing driving member 120 is further provided with a second sealing ring 122. The second sealing ring 122 separates the second pilot chamber 1112 from the air inlet chamber 111, and the driving chamber 1113 is located between the first pilot chamber 1111 and the second pilot chamber 1112. The first pilot chamber 1111 and the second pilot chamber 1112 are used to contain the second driving medium to drive the reversing driving member 120 and the air valve slider 130 to move between the first position and the second position. As shown in the embodiment of Figure 4 the second driving medium in the first pilot chamber 1111 acts on the left end of the reversing driving member 120, and the second driving medium in the second pilot chamber 1112 acts on the right end of the reversing driving member 120. By alternately filling the second driving medium into the first pilot chamber 1111 and the second pilot chamber 1112, the reversing driving member 120 can reciprocate between the first position and the second position.

[0095] In some other embodiments, the second sealing ring 122 may not be provided, and accordingly, the second pilot chamber 1112 may not be provided. Instead, the reversing drive member 120 may be driven to move by providing a spring at one end of the valve core. For example, in some embodiments, a first pilot chamber 1111 capable of admitting a second driving medium is provided at one end of the reversing drive member 120, and a spring is provided at the other opposite end of the reversing drive member 120. The reversing drive member 120 is moved from the first position to the second position and the spring is compressed by filling the first pilot chamber 1111 with the second driving medium. The reversing drive member 120 is moved from the second position to the first position under the action of the spring 123 by discharging the second driving medium from the first pilot chamber 1111, thereby achieving reciprocating motion of the reversing drive member 120. In other embodiments, other methods may be used to achieve reciprocating motion of the reversing drive member 120.

[0096] In some embodiments, as Figure 4 As shown, a first pilot chamber 1111 and a second pilot chamber 1112 are respectively provided at both ends of the reversing drive member 120 to drive the reversing drive member 120 to move; at the same time, a spring 123 is also provided at one end of the reversing drive member 120. Due to the presence of the spring 123, the movement speed of the reversing drive member 120 can be slowed down, thereby slowing down the reversing frequency; under the same usage time, the number of direction changes of the reversing drive member 120 and the number of direction changes of the first piston 220 in the booster pump are less, thereby reducing the wear of the reversing drive member 120 and the first piston 220, thereby extending the service life. Furthermore, the spring 123 is always in a compressed state, so that after the boost pump is normally shut down, the reversing drive member 120 can be pushed to the first position by the spring 123, so that the valve slider 130 is in a state of connecting the first drive branch 1121 with the exhaust channel 113; or the reversing drive member 120 can be pushed to the second position by the spring 123, so that the valve slider 130 is in a state of connecting the second drive branch 1122 with the exhaust channel 113, thereby avoiding Figure 4 The dead angle position shown (i.e., the air valve slider 130 blocks the first through hole 141 and the second through hole 142 at the same time, so that the first driving medium in the driving chamber 1113 can neither enter the first driving branch 1121 nor the second driving branch 1122) enables the booster pump to work normally after being restarted.

[0097] In some embodiments, as Figure 6As shown, an installation hole 124 is arranged at the end of one end of the reversing driving member 120, a spring 123 is arranged in the installation hole 124, and one end of the spring 123 abuts against the valve body 110 and the other end abuts against the bottom of the installation hole 124. The hole wall of the installation hole 124 can constrain the deformation of the spring 123, so that the spring 123 can work normally for a long time. Further, the spring 123 can be arranged in the first pilot chamber 1111 or the second pilot chamber 1112, and in Figures 2 to 4 In the embodiment shown, the spring 123 is arranged in the first pilot chamber 1111. In other embodiments, the spring 123 can be sleeved outside one end of the reversing driving member 120.

[0098] Further, in some embodiments, in order to reduce the wear of the reversing driving member 120 and the valve body 110, a bushing 160 made of self-lubricating plastic material is further arranged in the valve body 110. The self-lubricating plastic material refers to a plastic material that can release lubricant during friction and wear, has lubricating performance without adding external lubricant, and can reduce friction. The self-lubricating plastic material used in the embodiments of the present application can be polytetrafluoroethylene, and can also be polystyrene, polyethylene, polyimide, etc. As shown in the figure, the bushing 160 is arranged in the valve body 110. Figure 4 In the embodiment shown, two bushings 160 are arranged in the valve body 110, and the two bushings 160 are respectively located at the two ends of the reversing driving member 120. The first sealing ring 121 is arranged at the first end of the reversing driving member 120 and the outer side thereof is in contact with one bushing 160; the second sealing ring 122 is arranged at the second end of the reversing driving member 120 and the outer side thereof is in contact with the other bushing 160; further, the one-sided gap between the bushing 160 and the reversing driving member 120 is greater than 0.008 mm, so as to avoid the situation that impurities cause the reversing driving member 120 to be stuck; the gap can be specifically 0.2 mm to 0.5 mm, so as to facilitate the sealing of the first sealing ring 121 and the second sealing ring 122. Further, the reversing driving member 120 can also be made of plastic material, such as POM plastic or other types of plastic, so that the reversing driving member 120 is not easy to freeze in a low-temperature environment, and thus is not easy to be stuck.

[0099] In some embodiments, as shown in the figure, Figure 6As shown, the reversing driving member 120 has a first flange 125 and a second flange 126, and the air valve slider 130 is clamped between the first flange 125 and the second flange 126 to realize the movement of the air valve slider 130 driven by the reversing driving member 120. Further, the reversing driving member 120 can be a rotary body to facilitate processing, and in other embodiments, the reversing driving member 120 can be only cylindrical at both ends to facilitate the arrangement of the first sealing ring 121 and the second sealing ring 122. In other embodiments, a groove can be arranged on the peripheral surface of the reversing driving member 120, and the air valve slider 130 is installed in the groove to realize the movement of the air valve slider 130 driven by the reversing driving member 120.

[0100] In some embodiments, the side of the air valve slider 130 away from the sealing sheet 140 is a pressure bearing surface, and the contact area of the pressure bearing surface with the reversing driving member 120 is less than the area of the pressure bearing surface, so the reversing driving member 120 does not completely block the pressure bearing surface of the air valve slider 130. When the booster pump is working, the first driving medium first passes through the driving cavity 1113 and then passes through the communication cavity 131 in the air valve slider 130. When the first driving medium passes through the driving cavity 1113, the pressure bearing surface of the air valve slider 130 is exposed to the first driving medium, so the air valve slider 130 is pressed against the sealing sheet 140 under the action of the first driving medium; realizing the surface contact with the sealing sheet 140.

[0101] Further, a compression state elastic member can also be arranged between the air valve slider 130 and the reversing driving member 120, and the air valve slider 130 is pressed against the sealing sheet 140 by the force exerted by the elastic member to realize the surface contact between the air valve slider 130 and the sealing sheet 140 and achieve sealing.

[0102] In some embodiments, as shown, Figures 2 to 5 As shown, the valve body 110 is also provided with a first pilot branch 1141 and a second pilot branch 1142. The first end of the first pilot branch 1141 is in communication with the first pilot cavity 1111, and the second end is located on the surface of the valve body 110 to introduce the second driving medium into the first pilot cavity 1111 to move the reversing driving member 120 to the second position. The first end of the second pilot branch 1142 is in communication with the second pilot cavity 1112, and the second end is located on the surface of the valve body 110 to introduce the second driving medium into the second pilot cavity 1112 to move the reversing driving member 120 to the first position. It should be noted that the directions of the first pilot branch 1141 and the second pilot branch 1142 shown in the drawings are for the purpose of facilitating the explanation of the principle of the reversing valve 100 provided in the present application. When implementing the reversing valve 100 provided in the present application, the directions of the hole structures such as the first pilot branch 1141 and the second pilot branch 1142 can be designed according to actual needs.

[0103] In order to reduce the control cost of the reversing valve 100 and the booster pump, in some embodiments, the valve body 110 is further provided with a pilot 150, which includes a mounting portion for mounting and fixing the pilot 150, and a movable portion that can move relative to the mounting portion. The movable portion can extend into the first pilot branch 1141 and / or the second pilot branch 1142 to block the flow of the second driving medium. That is, the first pilot branch 1141 or the second pilot branch 1142 can be cut off by the pilot 150 alone, or by the pilot 150 simultaneously. There can be one pilot 150 for each of the first pilot branch 1141 and the second pilot branch 1142, or there can be two movable portions in the pilot 150, one for cutting off the first pilot branch 1141 to block the second driving medium from entering the first pilot chamber 1111, and the other for cutting off the second pilot branch 1142 to block the second driving medium from entering the second pilot chamber 1112. In this embodiment, the first pilot branch 1141 is understood to be all the channel structures in the valve body 110 for introducing the second driving medium into the first pilot chamber 1111. In the case where the channel for introducing the second driving medium into the first pilot chamber 1111 not only passes through the valve body 110 but also passes through the driving cylinder unit 200, the channel structure will be disconnected. As mentioned later Figure 2 With Figure 8 the embodiment shown, the channel structure for introducing the second driving medium into the first pilot chamber 1111 includes the fifth pilot branch 115 and the first pilot branch 1141; therefore, in the scheme where the movable portion is configured to extend into the first pilot branch 1141 to cut off the first pilot branch 1141 and block the second driving medium from entering the first pilot chamber 1111, the first pilot branch 1141 includes Figure 2 With Figure 8 the first pilot branch 1141 and the fifth pilot branch 115 in the embodiment shown. Similarly, in the scheme where the movable portion is configured to extend into the second pilot branch 1142 to cut off the second pilot branch 1142 and block the second driving medium from entering the second pilot chamber 1112, the second pilot branch 1142 includes Figure 2 With Figure 8 the second pilot branch 1142 and the sixth pilot branch 116 in the embodiment shown.

[0104] In the above embodiment, the pilot 150 can adopt a cylinder or a hydraulic cylinder or other existing device. The cylinder body of the cylinder and the hydraulic cylinder corresponds to the mounting portion, and the extendable piston rod corresponds to the movable portion. Other existing branches that can cut off the first pilot branch 1141 or the second pilot branch 1142 can also be adopted. After the pilot 150 cuts off the first pilot branch 1141 or the second pilot branch 1142, the second driving medium cannot be introduced into the first pilot chamber 1111 or the second pilot chamber 1112, and the reciprocating movement of the reversing driving member 120 cannot be realized, and the booster pump cannot continue to work. After the movable portion of the pilot 150 is moved away from the first pilot branch 1141 or the second pilot branch 1142, the reversing driving member 120 can continue to reciprocate, and the booster pump can continue to work to output the pressure fluid. That is, in the above embodiment, the pilot 150 can realize the work suspension of the reversing valve 100 and the booster pump with the reversing valve 100. In the existing way of realizing the temporary stop of the work of the reversing valve 100 and the booster pump, an electromagnetic valve is arranged on the valve body 110. When the electromagnetic valve is powered on or powered off, the first driving medium cannot enter the intake chamber 111 from the intake port 1110, and the function of suspending the work of the booster pump is realized.

[0105] In the embodiment in which the first pilot branch 1141 and the second pilot branch 1142 are used to drive the reversing driving member 120 to move, a larger flow rate does not need to be provided in the first pilot chamber 1111 and the second pilot chamber 1112, and thus the sizes of the first pilot branch 1141 and the second pilot branch 1142 are small. For example, the diameters of the holes of the first pilot branch 1141 and the second pilot branch 1142 can be controlled in the range of 2.5 mm to 5 mm, and the specific diameters can be 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, or 5 mm, and the preferred diameter is in the range of 3 mm to 3.5 mm. The flow rate of the first driving medium output by the reversing valve 100 to the driving cylinder unit 200 is large, and thus the intake port 1110 needs to have a large diameter to provide a large flow rate to the intake chamber 111. The size of the existing intake port 1110 is mostly above 12.5 mm. Because the size of the intake port 1110 is large, the size of the electromagnetic valve required is also large, resulting in a large cost. Because the diameters of the holes of the first pilot branch 1141 and the second pilot branch 1142 are small, the cost of the embodiment provided in the present application in which the pilot 150 is arranged is lower.

[0106] In some embodiments of the present application, the timing at which the first pilot branch 1141 and the second pilot branch 1142 introduce the second driving medium into the first pilot chamber 1111 and the second pilot chamber 1112 is separately controlled. For example, the electromagnetic reversing valve 100 is used to introduce the second driving medium into the first pilot chamber 1111 or the second pilot chamber 1112.

[0107] In some other embodiments, the timing of the first pilot branch 1141 and the second pilot branch 1142 to introduce the second driving medium into the first pilot chamber 1111 and the second pilot chamber 1112 can also be directly controlled by the first piston 220. When the first piston 220 moves forward to the limit position, the first pilot branch 1141 introduces the second driving medium into the first pilot chamber 1111 to make the reversing driving member 120 move to the second position. When the first piston 220 moves reversely to the limit position, the second pilot branch 1142 introduces the second driving medium into the second pilot chamber 1112 to make the reversing driving member 120 move to the first position. In this embodiment, a third pilot branch 2112 and a fourth pilot branch 2122 need to be arranged on the first cylinder 210 connected with the reversing valve 100, and a switch triggered by the first piston 220 needs to be arranged on the third pilot branch 2112 and the fourth pilot branch 2122. The structure of the booster pump will be described later.

[0108] The reversing valve 100 provided in the present application can be used with the first driving medium and the second driving medium from the same supply device. A part of the driving medium enters the first driving branch 1121 and the second driving branch 1122 to drive the first piston 220 to move, and another part of the driving medium enters the first pilot branch 1141 and the second pilot branch 1142 to drive the reversing valve 100 to reverse. As shown in the embodiment, the valve body 110 is provided with a fifth pilot branch 115 and a sixth pilot branch 116, and the fifth pilot branch 115, the sixth pilot branch 116 and the driving chamber 1113 are all connected with the air inlet 1110. Therefore, a part of the driving medium enters the fifth pilot branch 115 and the sixth pilot branch 116 at the air inlet 1110 to become the second driving medium, and then enters the first pilot chamber 1111 and the second pilot chamber 1112 through the first pilot branch 1141 and the second pilot branch 1142 (the specific method will be described in the booster pump part later). Another part of the driving medium enters the driving chamber 1113 and then enters the first driving branch 1121 and the second driving branch 1122 to become the first driving medium. Figure 5

[0109] Further, as shown in the embodiment, the valve body 110 is provided with a fifth pilot branch 115 and a sixth pilot branch 116, and the fifth pilot branch 115, the sixth pilot branch 116 and the driving chamber 1113 are all connected with the air inlet 1110. Therefore, a part of the driving medium enters the fifth pilot branch 115 and the sixth pilot branch 116 at the air inlet 1110 to become the second driving medium, and then enters the first pilot chamber 1111 and the second pilot chamber 1112 through the first pilot branch 1141 and the second pilot branch 1142 (the specific method will be described in the booster pump part later). Another part of the driving medium enters the driving chamber 1113 and then enters the first driving branch 1121 and the second driving branch 1122 to become the first driving medium. Figure 2 ​In the illustrated embodiment, the pilot 150 is disposed in the sixth pilot branch 116, in other embodiments, the pilot 150 can be disposed in the fifth pilot branch 115, or the third pilot branch 2112, or the fourth pilot branch 2122.

[0110] The reversing valve 100 provided by the present application, the first driving medium and the second driving medium can be supplied separately, that is, the valve body 110 is connected by a separate pipeline to provide the first driving medium; the valve body 110 is connected by a separate pipeline to provide the second driving medium.

[0111] The present application also provides a booster pump, comprising a first cylinder 210 and the reversing valve 100 provided by the present application, so as to adopt Figure 2 、 Figure 3 The reversing valve 100 as shown is taken as an example, the reversing valve 100 provided by the present application is installed in the first cylinder 210, the first cylinder 210 has a first piston 220, the first piston 220 reciprocates between the first end and the second end of the first cylinder 210. In some embodiments, as shown in Figure 8 , when the reversing driving member 120 and the valve slider 130 are in the first position, the first piston 220 moves from the first end of the first cylinder 210 to the second end of the first cylinder 210; in other embodiments, when the reversing driving member 120 and the valve slider 130 are in the first position, the first piston 220 can also move from the second end of the first cylinder 210 to the first end of the first cylinder 210.

[0112] As shown in Figure 2 、 Figure 5 、 Figure 8 and Figure 9As shown, the first cylinder 210 is further provided with a third driving branch 2111 and a fourth driving branch 2121. The first end of the third driving branch 2111 is communicated with the inside of the first cylinder 210 from the first end of the first cylinder 210, and the second end is butted against the first driving branch 1121, so that the first driving branch 1121 sends the first driving medium into the first cylinder 210 from the first end of the first cylinder 210 through the third driving branch 2111. The first end of the fourth driving branch 2121 is communicated with the inside of the first cylinder 210 from the second end of the first cylinder 210, and the second end is butted against the second driving branch 1122, so that the second driving branch 1122 sends the first driving medium into the first cylinder 210 from the second end of the first cylinder 210 through the fourth driving branch 2121. Therefore, when the reversing driving member 120 and the valve slider 130 are in the first position, the first driving medium enters the first cylinder 210 from the second end of the first cylinder 210 and pushes the first piston 220 to move towards the first end of the first cylinder 210; when the reversing driving member 120 and the valve slider 130 are in the second position, the first driving medium pushes the first piston 220 to move towards the second end of the first cylinder 210.

[0113] In some embodiments in which the reversing valve 100 used in the booster pump is provided with the first pilot branch 1141 and the second pilot branch 1142, as shown in Figure 2 , Figure 5 and Figures 8 to 11 , the first cylinder 210 is further provided with a third pilot branch 2112 and a fourth pilot branch 2122, and a normally closed first switch 231 and a normally closed second switch 232; the first switch 231 in the closed state is used to cut off the third pilot branch 2112, and the second switch 232 in the closed state is used to cut off the fourth pilot branch 2122. The first end of the third pilot branch 2112 is communicated with the second end of the first pilot branch 1141; the first end of the fourth pilot branch 2122 is communicated with the second end of the second pilot branch 1142. Further, as shown in Figure 12 and Figure 13As shown, when the first piston 220 moves to the first end of the first cylinder 210, the first switch 231 can be opened, so that the second driving medium enters the first pilot chamber 1111 through the third pilot branch 2112 and the first pilot branch 1141, pushing the reversing drive member 120 to move from the first position to the second position. When the reversing drive member 120 moves to the second position, the first driving medium enters the first cylinder 210 from the first end of the first cylinder 210, causing the first piston 220 to move toward the second end of the first cylinder 210. Therefore, the first switch 231 is restored to the closed state. state; similarly, when the first piston 220 moves to the second end of the first cylinder body 210, the second switch 232 can be turned on to allow the second driving medium to enter the second pilot chamber 1112 through the fourth pilot branch 2122 and the second pilot branch 1142, pushing the reversing driving member 120 to move toward the first position. When the reversing driving member 120 is in the first position, the first driving medium enters the first cylinder body 210 from the second end of the first cylinder body 210, causing the first piston 220 to move toward the first end of the first cylinder body 210, and therefore, the second switch 232 returns to the closed state.

[0114] Further, if Figure 9 As shown, the first cylinder 210 includes a cylinder 213, a first end cap 211 disposed at a first end of the cylinder 213, and a second end cap 212 disposed at a second end of the cylinder 213. The first end of the cylinder 213 faces the first end of the first cylinder 210, and the second end of the cylinder 213 faces the second end of the first cylinder 210. The third pilot branch 2112 and the first switch 231 are disposed on the first end cap 211, and the fourth pilot branch 2122 and the second switch 232 are disposed on the second end cap 212.

[0115] Furthermore, in some embodiments where the first driving medium and the second driving medium of the booster pump are supplied from the same supply device, such as Figure 5 As shown, the valve body 110 is also provided with a fifth pilot branch 115 and a sixth pilot branch 116; the first ends of the fifth pilot branch 115 and the sixth pilot branch 116 are connected to the air inlet 1110. At the position of the air inlet 1110, a part of the driving medium enters the fifth pilot branch 115 and the sixth pilot branch 116 and becomes the second driving medium for driving the reversing driving member 120 to move; the other part of the driving medium enters the driving chamber 1113 through the position of the air inlet 1110, and then becomes the first driving medium for driving the first piston 220 to move. The second ends of the fifth pilot branch 115 and the sixth pilot branch 116 are located on the surface of the valve body 110. As shown Figure 8As shown, the second end of the third pilot branch 2112 is connected to the second end of the fifth pilot branch 115, and the second end of the fourth pilot branch 2122 is connected to the second end of the sixth pilot branch 116, so as to be connected to the third drive branch 2111 and the fourth drive branch 2121 in the first cylinder body 210, so as to realize the control of the second drive medium to enter the first pilot chamber 1111 through the fifth pilot branch 115, the third pilot branch 2112 and the first pilot branch 1141 in sequence, or to enter the second pilot chamber 1112 through the sixth pilot branch 116, the fourth pilot branch 2122 and the second pilot branch 1142 in sequence by triggering the first switch 231 and the second switch 232 through the first piston 220.

[0116] In some embodiments, the third pilot branch 2112 and the fourth pilot branch 2122 may not be provided, and the first pilot branch 1141 is directly connected to the fifth pilot branch 115 , and the second pilot branch 1142 is directly connected to the sixth pilot branch 116 .

[0117] In some embodiments, a first exhaust branch 2114 for exhausting the second driving medium in the first pilot chamber 1111 and a second exhaust branch 2123 for exhausting the second driving medium in the second pilot chamber 1112 are further provided. Figure 9 、 Figure 11 and Figure 13 As shown, as shown, the first exhaust branch 2114 and the second exhaust branch 2123 are arranged in the first cylinder body 210 and are controlled by the first switch 231 and the second switch 232. When the first switch 231 is closed, the first end of the first exhaust branch 2114 is connected to the first pilot branch 1141 through the third pilot branch 2112. When the first switch 231 is turned on, the first end opening of the first exhaust branch 2114 is closed by the first switch 231; when the second switch 232 is closed, the first end of the second exhaust branch 2123 is connected to the second pilot branch 1142 through the fourth pilot branch 2122. When the second switch 232 is turned on, the first end opening of the second exhaust branch 2123 is closed by the second switch 232; the second ends of the first exhaust branch 2114 and the second exhaust branch 2123 are both connected to the atmosphere. Therefore, when the first switch 231 is closed, the second driving medium in the first pilot chamber 1111 can be discharged through the first pilot branch 1141, the third pilot branch 2112 and the first exhaust branch 2114; when the second switch 232 is closed, the second driving medium in the second pilot chamber 1112 can be discharged through the second pilot branch 1142, the fourth pilot branch 2122 and the second exhaust branch 2123.

[0118] In some embodiments, as Figures 9 to 13As shown, the first switch 231 and the second switch 232 are both composed of a pilot valve and a reset spring, and the first end cover 211 is provided with a blind hole 2113 for mounting the first switch 231, the blind hole 2113 is located in the third pilot branch 2112, and the third pilot branch 2112 is formed with a first opening 21121 and a second opening 21122 facing the blind hole 2113, the pilot valve has a third flange 2311 and a fourth flange 2312, and when the first switch 231 is in a closed state, one of the third flange 2311 and the fourth flange 2312 blocks the first opening 21121 of the third pilot branch 2112, thereby cutting off the third pilot branch 2112, and the first exhaust branch 2114 is connected to the third pilot branch 2112 through the second opening 21122 and then connected to the first pilot cavity 1111. When the first switch 231 is in an open state, the fourth flange 2312 of the pilot valve blocks the first end of the first exhaust branch 2114, and the first opening 21121 and the second opening 21122 of the third pilot branch 2112 are connected to each other.

[0119] In some embodiments, the third pilot branch 2112, the fourth pilot branch 2122, the first switch 231, the second switch 232, the fifth pilot branch 115 and the sixth pilot branch 116 can also not be provided; the device for supplying the second driving medium is directly connected through the first pilot branch 1141 and the second pilot branch 1142.

[0120] In some embodiments, the booster pump further comprises a booster unit, and the first piston 220 and the second piston 230 are connected through a piston rod 240. The area of the second piston 230 is smaller than the area of the first piston 220, so that the pressure of the fluid output from the booster unit can be increased.

[0121] Please refer to Figure 8 , Figure 12 , Figures 14 to 17 The working principle of the booster pump provided by the present application is as follows:

[0122] In Figure 8 , the reversing driving member 120 and the valve slider 130 are located at the first position, at this time, the first driving medium in the driving cavity 1113 enters the first cylinder body 210 from the second end of the first cylinder body 210 through the second driving branch 1122 and the fourth driving branch 2121, and pushes the first piston 220 to move towards the first end of the first cylinder body 210 from the right side of the first piston 220, and the first driving medium on the left side of the first piston 220 is discharged through the third driving branch 2111, the first driving branch 1121 and the exhaust passage 113.

[0123] As Figure 12 and Figure 14As shown, the first piston 220 moves to trigger the first switch 231, so that when the first switch 231 is turned on, the pilot valve in the first switch 231 blocks the first end of the first exhaust branch 2114, and the second driving medium enters the first pilot chamber 1111 from the fifth pilot branch 115, the third pilot branch 2112 and the first pilot branch 1141 in sequence, and pushes the reversing drive member 120 to move to the second position. During the movement of the reversing drive valve, the second driving medium in the second pilot chamber 1112 is discharged through the second pilot branch 1142, the fourth pilot branch 2122 and the second exhaust branch 2123.

[0124] like Figure 14 and Figure 15 As shown, after the reversing drive member 120 and the air valve slider 130 move to the second position, the first driving medium in the driving chamber 1113 enters from the first end of the first cylinder 210 through the first driving branch 1121 and the third driving branch 2111, and pushes the first piston 220 to move toward the second end of the first cylinder 210; during the process of changing the movement direction of the first piston 220, the first piston 220 separates from the first switch 231, so that the first switch 231 returns to the normally closed state.

[0125] Likewise, if Figure 16 and Figure 17 As shown, after the first piston 220 moves to the second end of the first cylinder 210 and triggers the second switch 232, the reversing drive member 120 and the valve slider 130 move to the first position under the action of the second driving medium, and then the movement direction of the first piston 220 is reversed again.

[0126] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A reversing valve suitable for use in a booster pump, characterized in that, The valve body has an air inlet cavity, a first driving branch, a second driving branch, an exhaust passage, and an air inlet, wherein the air inlet is connected to the air inlet cavity to send in the first driving medium. A reversing driving member driven by the second driving medium is installed in the valve body, and the reversing driving member is further provided with a first sealing ring, which separates the first driving cavity for the first driving medium and the first pilot cavity for the driving medium in the air inlet cavity, so as to separate the first driving medium from the second driving medium. A sealing sheet is detachably arranged in the driving cavity, and the sealing sheet has a first through hole connected to the first driving branch, a second through hole connected to the second driving branch, and a third through hole between the first through hole and the second through hole, wherein the third through hole is connected to the exhaust passage. A valve slider connected to the reversing driving member is arranged in the driving cavity, and the first side of the valve slider has a communication cavity and is in surface contact with the sealing sheet, and the valve slider can move relative to the sealing sheet between a first position and a second position. In the first position, the communication cavity connects the first through hole and the third through hole, the communication cavity is not connected to the second through hole, and the second through hole is connected to the driving cavity, so that the first driving medium in the driving cavity enters the second driving branch; in the second position, the communication cavity connects the second through hole and the third through hole, the communication cavity is not connected to the first through hole, and the first through hole is connected to the driving cavity, so that the first driving medium in the driving cavity enters the first driving branch. The sealing sheet and the valve slider are both ceramic structural members. The reversing driving member is further provided with a second sealing ring, which separates the second pilot cavity in the air inlet cavity, and the driving cavity is located between the first pilot cavity and the second pilot cavity; the first pilot cavity and the second pilot cavity are used to contain the second driving medium to drive the reversing driving member and the valve slider to move between the first position and the second position.

2. The reversing valve of claim 1, wherein The valve body is further provided with a first pilot branch and a second pilot branch, wherein the first end of the first pilot branch is connected to the first pilot cavity, and the second end is located on the surface of the valve body, so that the second driving medium is introduced into the first pilot cavity to drive the reversing driving member to move to the second position; the first end of the second pilot branch is connected to the second pilot cavity, and the second end is located on the surface of the valve body, so that the second driving medium is introduced into the second pilot cavity to drive the reversing driving member to move to the first position.

3. The reversing valve of claim 1, wherein The valve body is further provided with a pilot device, which includes a mounting part and a movable part, wherein the movable part is configured to extend into the first pilot branch to cut off the first pilot branch and prevent the second driving medium from entering the first pilot cavity; 4. The reversing valve of claim 3, wherein and / or the movable part is configured to extend into the second pilot branch to cut off the second pilot branch and prevent the second driving medium from entering the second pilot cavity.

5. The reversing valve of claim 4, wherein ​ ​ 6. The reversing valve of claim 5, wherein The diameters of the first pilot branch and the second pilot branch are 2.5mm-5mm, preferably 3mm-3.5mm.

7. The diverter valve of claim 3, wherein, The reversing drive member is a plastic structure, and the valve body is provided with a self-lubricating plastic shaft sleeve; the first sealing ring is arranged at the first end of the reversing drive member and in contact with the shaft sleeve on the outside, and the second sealing ring is arranged at the first end of the reversing drive member and in contact with the shaft sleeve on the outside.

8. The diverter valve of claim 3, wherein, One end of the reversing drive member is provided with a spring, one end of the spring is connected with the valve body, and the other end is connected with the reversing drive member, and the spring is used to move the reversing drive member to the first position or the second position.

9. The reversing valve of claim 8, wherein, The end of the reversing drive member is provided with a mounting hole, the spring is arranged in the first pilot cavity or the second pilot cavity, one end of the spring is in abutment with the valve body, and the other end is located in the mounting hole and in abutment with the bottom of the mounting hole.

10. The reversing valve of claim 1, wherein The gas valve slider includes a pressure bearing surface on the side opposite to the sealing sheet, and the contact area of the pressure bearing surface with the reversing drive member is less than the area of the pressure bearing surface. And / or a compression state elastic member is arranged between the gas valve slider and the reversing drive member, and the gas valve slider is configured to be in contact with the sealing sheet under the action of the elastic member.

11. A reversing valve suitable for use in a booster pump, characterized in that Comprise: A valve body has an air inlet cavity, a first drive branch, a second drive branch, an exhaust passage, and an air inlet, the first drive branch and the second drive branch are used to discharge the first drive medium entering the air inlet cavity from the air inlet; A reversing drive member is arranged in the air inlet cavity; A sealing sheet is arranged in the air inlet cavity, the sealing sheet has a first through hole opposite to the first drive branch, a second through hole opposite to the second drive branch, and a third through hole between the first through hole and the second through hole, the third through hole is opposite to the exhaust passage; And A gas valve slider connected with the reversing drive member, the gas valve slider is located in the air inlet cavity, the first side of the gas valve slider has a communication cavity and is in surface contact with the sealing sheet; A drive assembly connected with the reversing drive member, the drive assembly is mounted on the valve body to drive the reversing drive member to reciprocate the gas valve slider between the first position and the second position; In the first position, the communication cavity communicates the first through hole with the third through hole, the communication cavity does not communicate with the second through hole, and the second through hole communicates with the air inlet cavity, so that the first drive medium in the air inlet cavity enters the second drive branch; in the second position, the communication cavity communicates the second through hole with the third through hole, the communication cavity does not communicate with the first through hole, and the first through hole communicates with the air inlet cavity, so that the first drive medium in the air inlet cavity enters the first drive branch.

12. The reversing valve of claim 11, wherein, The distance between the reversing drive member and the inner wall of the air inlet cavity is not less than 0.008mm.

13. A booster pump characterized by The reversing valve comprises a drive cylinder unit and the reversing valve of any one of claims 1-12, the drive cylinder unit comprising a first cylinder body and a first piston located in the first cylinder body, the first piston being configured to reciprocate between a first end and a second end of the first cylinder body; The first cylinder body is provided with a third drive branch and a fourth drive branch, a first end of the third drive branch being in communication with the inside of the first cylinder body from the first end of the first cylinder body, a second end of the third drive branch being in abutment with the first drive branch, so that the first drive branch sends the first drive medium into the first cylinder body from the first end of the first cylinder body through the third drive branch; a first end of the fourth drive branch being in communication with the inside of the first cylinder body from the second end of the first cylinder body, a second end of the fourth drive branch being in abutment with the second drive branch, so that the second drive branch sends the first drive medium into the first cylinder body from the second end of the first cylinder body through the fourth drive branch.

14. A booster pump characterized by The reversing valve comprises a drive cylinder unit and the reversing valve of any one of claims 4-6, the drive cylinder unit comprising a first cylinder body and a first piston located in the first cylinder body, the first piston being configured to reciprocate between a first end and a second end of the first cylinder body; The first cylinder body is provided with a third pilot branch, a fourth pilot branch, a normally closed first switch and a normally closed second switch, the first switch being used to cut off the third pilot branch in the closed state, the second switch being used to cut off the fourth pilot branch in the closed state; A first end of the third pilot branch is in communication with a second end of the first pilot branch; a first end of the fourth pilot branch is in communication with a second end of the second pilot branch; The first cylinder body is configured to open the first switch when the first piston moves to the first end of the first cylinder body, so that the second drive medium enters the first pilot chamber through the third pilot branch and the first pilot branch, and pushes the reversing drive member to move to the second position; the first cylinder body is configured to open the second switch when the first piston moves to the second end of the first cylinder body, so that the second drive medium enters the second pilot chamber through the fourth pilot branch and the second pilot branch, and pushes the reversing drive member to move to the first position.

15. The booster pump of claim 14, wherein, The valve body is further provided with a fifth pilot branch and a sixth pilot branch; both the fifth pilot branch and the sixth pilot branch have a first end in communication with the gas inlet and a second end on the surface of the valve body; A second end of the third pilot branch is in communication with a second end of the fifth pilot branch, and a second end of the fourth pilot branch is in communication with a second end of the sixth pilot branch; When the first switch is opened, the drive medium in the drive chamber can enter the first pilot chamber through the fifth pilot branch, the third pilot branch and the first pilot branch in sequence, and push the reversing drive member to move to the second position; when the second switch is opened, the drive medium in the drive chamber can enter the second pilot chamber through the sixth pilot branch, the fourth pilot branch and the second pilot branch in sequence, and push the reversing drive member to move to the first position.

16. The booster pump of claim 14, wherein, Further comprising a first exhaust branch and a second exhaust branch; when the first switch is closed, a first end of the first exhaust branch is communicated with the first pilot branch through the third pilot branch; when the first switch is opened, the first end opening of the first exhaust branch is closed by the first switch; when the second switch is closed, a first end of the second exhaust branch is communicated with the second pilot branch through the fourth pilot branch; when the second switch is opened, the first end opening of the second exhaust branch is closed by the second switch; the second ends of the first exhaust branch and the second exhaust branch are communicated with the atmosphere.

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