Plug valve and water air conditioner

Abstract

This invention relates to a stopcock valve and a water-cooled air conditioner. The stopcock valve includes: a valve body having a fluid inlet and a fluid outlet; a valve core disposed within the valve body and rotatable between an open position and a closed position, the valve core including a first valve plate and a second valve plate, wherein in the closed position, the first valve plate closes the fluid inlet and the second valve plate closes the fluid outlet; and a scraping structure disposed on an opposing surface that slides in contact with the sealing surface of the second valve plate and is located on the rotation path of the second valve plate, and configured to scrape the sealing surface of the second valve plate during rotation of the valve core.

Description

Technical Field

[0001] The present invention relates to a stopcock valve and a water air conditioner including such a stopcock valve. Background Technology

[0002] A plug valve is a rotary valve with a shut-off element or plunger. It is opened or closed by rotating the plug 90 degrees to open or close the passage on the plug relative to the passage on the valve body. The plug can be cylindrical or conical. In cylindrical plugs, the passage is typically rectangular.

[0003] In traditional plug valves, the valve body is typically fitted directly onto the outer circumference of the valve core, which is usually in direct contact with the valve core and is made of metal. Due to manufacturing processes, the inner sides of the passage openings on both sides of the valve body have angular structures. This can cause the valve core to jam during rotation, preventing it from turning.

[0004] A plug valve typically consists of a valve disc on the "upstream" side and a valve disc on the "downstream" side. When the plug valve is closed, the pressure difference between the valve body's inlet and outlet is significant, allowing fluid to push open the upstream valve disc and enter the valve body. Meanwhile, the downstream valve disc, under the pressure of the fluid, presses tightly against the inner surface of the valve body, achieving a reliable seal. The "upstream" side generally refers to the side from which the fluid originates, while the "downstream" side generally refers to the side to which the fluid flows.

[0005] During the operation of such a plug valve, especially when the downstream valve plate is opened to a certain angle, the valve plate will slightly oscillate due to fluid pressure, causing a portion of the downstream valve plate to deviate from the inner surface of the valve body, thus leading to leakage. In cases of contaminated fluid, impurities may accumulate in the gap between the outer surface of the downstream valve plate and the inner surface of the valve body, adhering to the outer surface of the downstream valve plate. This causes wear on the downstream valve plate and prevents complete contact between the valve plate and the inner surface of the valve body, resulting in leakage. Furthermore, the plug valve experiences significant torque during rotation. Summary of the Invention

[0006] This invention relates to a plug valve, comprising: a valve body including a fluid inlet and a fluid outlet; a valve core disposed within the valve body and rotatable between an open position and a closed position, the valve core including a first valve plate and a second valve plate, wherein in the closed position, the first valve plate closes the fluid inlet and the second valve plate closes the fluid outlet; and a scraping structure disposed on an opposing surface that slides in contact with the sealing surface of the second valve plate and is located on the rotation path of the second valve plate, and configured to scrape the sealing surface of the second valve plate during rotation of the valve core.

[0007] Advantageously, the opposing surfaces are formed on the inner surface of the valve body.

[0008] Advantageously, it also includes a protective sleeve fixedly mounted to the valve body and disposed between the valve core and the valve body, the opposing surfaces being formed on the protective sleeve, the protective sleeve including a first opening and a second opening respectively communicating with the fluid inlet and the fluid outlet, the valve core rotating within the protective sleeve such that the first and second valve plates respectively open or close the first and second openings.

[0009] Advantageously, the scraping structure has a first scraping member and a second scraping member, the first scraping member being configured to scrape a portion of the sealing surface of the second valve plate when the valve core rotates from the closed position to the open position, and the second scraping member being configured to scrape the remaining portion of the sealing surface of the second valve plate when the valve core rotates from the open position to the closed position.

[0010] Advantageously, the scraping structure includes a groove, a first edge of which is configured as a first scraping element, and a second edge of which is configured as a second scraping element.

[0011] Advantageously, the plug valve further includes another scraping structure configured to scrape a portion of the sealing surface of the second valve plate as the valve core rotates from the closed position to the open position, and the other scraping structure configured to scrape the remaining portion of the sealing surface of the second valve plate as the valve core rotates from the closed position to the open position.

[0012] Advantageously, the scraping structure includes a first groove disposed on the opposing surface, along the rotational direction of the valve core from the closed position to the open position, the first groove being disposed downstream of the fluid outlet, and the first groove including a first edge configured to scrape a portion of the sealing surface of the second valve plate when the valve core rotates from the closed position to the open position; the other scraping structure includes a second groove disposed on the opposing surface, along the rotational direction, upstream of the fluid outlet, and including a first edge configured to scrape the remaining portion of the sealing surface of the second valve plate when the valve core rotates from the closed position to the open position.

[0013] Advantageously, the plug valve further includes another scraping structure configured to scrape a first portion of the sealing surface of the second valve plate when the valve core rotates from the closed position to the open position, a second portion of the sealing surface of the second valve plate when the valve core rotates from the closed position to the open position, and a third portion of the outer surface of the second valve plate when the valve core rotates from the open position to the closed position, the first, second, and third portions together covering at least the entire area of ​​the sealing surface of the second valve plate.

[0014] Advantageously, the scraping structure includes a first groove disposed on the opposing surface along the rotational direction of the valve core from the closed position to the open position, the first groove being disposed downstream of the fluid outlet, and the first groove including a first edge and a second edge, the first edge being configured to scrape a second portion of the sealing surface of the second valve plate when the valve core rotates from the closed position to the open position, and the second edge being configured to scrape a third portion of the sealing surface of the second valve plate when the valve core rotates from the open position to the closed position. The other scraping structure includes a second groove disposed on the opposing surface along the rotational direction upstream of the fluid outlet, and including a first edge, the first edge being configured to scrape a first portion of the sealing surface of the second valve plate when the valve core rotates from the closed position to the open position.

[0015] Advantageously, the valve body includes a valve body body for receiving the valve core and a plug cap removably mounted to the valve body body.

[0016] Advantageously, the valve body is provided with a stop member configured to abut against the second valve plate to prevent the outer surface of the second valve plate from moving away from the inner surface of the protective sleeve under the action of fluid pressure.

[0017] Advantageously, the stop includes a first stop disposed on the valve body and / or a second stop disposed on the stopcock cover.

[0018] Advantageously, the second valve plate has a valve plate body and a first mating member and a second mating member extending outward from both ends of the valve plate body, the first stop member abutting against the first mating member and the second stop member abutting against the second mating member.

[0019] Advantageously, an annular mounting groove is provided on the outer surface of the protective sleeve. The annular mounting groove has a first portion extending along the outer surface above a first opening, a second portion extending along the outer surface below a second opening, and an intermediate portion extending obliquely on the outer surface to connect the first portion and the second portion, respectively. An annular sealing ring is disposed in the annular mounting groove, with a first portion of the annular sealing ring disposed in the first portion of the annular mounting groove, a second portion of the annular sealing ring disposed in the second portion of the annular mounting groove, and a third portion of the annular sealing ring disposed in the intermediate portion of the annular mounting groove.

[0020] Advantageously, the inner surface of the protective sleeve is provided with a first annular groove, which is disposed in a first plane perpendicular to the longitudinal axis of the protective sleeve, and the first plane in which the first annular groove is located is different from the plane in which the first part of the annular mounting groove is located, and the first sealing ring is disposed in the first annular groove.

[0021] Advantageously, the inner surface of the protective sleeve is provided with a second annular groove, which is disposed in a second plane perpendicular to the longitudinal axis of the protective sleeve, and the second plane in which the second annular groove is located is different from the plane in which the second part of the annular mounting groove is located, and the second sealing ring is disposed in the second annular groove.

[0022] Advantageously, the valve core further includes a connecting rod, the first end of which is connected to the first valve plate and the second end of which is connected to the second valve plate.

[0023] Advantageously, the first valve plate has a first groove for receiving a first end of the connecting rod, and the second valve plate has a second groove for receiving a second end of the connecting rod. There is a first gap between the first end of the connecting rod and the closed end of the first groove, and a second gap between the second end of the connecting rod and the closed end of the second groove, such that the connecting rod can move relative to the first valve plate and the second valve plate.

[0024] Advantageously, the valve core further includes a first return spring and a second return spring, the first return spring being connected between the inner surface of the first valve plate and the valve stem, and the second return spring being connected between the inner surface of the second valve plate and the valve stem.

[0025] Advantageously, the valve body has a mounting hole through which the valve core passes, the stopcock cap is partially inserted into the protective sleeve to close the mounting hole, and a plurality of sealing rings are disposed between the protective sleeve and the stopcock cap, between the stopcock cap and the valve body, and between the top of the protective sleeve and the valve body.

[0026] Advantageously, the protective sleeve is a plastic protective sleeve.

[0027] Advantageously, the plug valve further includes a locating pin inserted into the protective sleeve and the valve body to position the relative positions of the protective sleeve and the valve body.

[0028] The present invention also relates to a water-cooled air conditioner, which includes a stopcock valve as described above. Attached Figure Description

[0029] The advantages and objectives of the invention will be better understood from the preferred embodiments described below in conjunction with the accompanying drawings. The drawings are not to scale in order to better illustrate the relationships between the components.

[0030] Figure 1 A perspective view of a plug valve according to the present invention is shown.

[0031] Figure 2 A side view of a plug valve according to the present invention is shown.

[0032] Figure 3 The plug valve according to the invention is shown along Figure 2A sectional view of line AA.

[0033] Figure 4 A perspective view of the plug valve according to the invention with the valve body removed is shown.

[0034] Figure 5 Show Figure 4 Front view of the structure.

[0035] Figure 6a and 6b Show Figure 4 The left and right views of the structure.

[0036] Figure 7 Show along Figure 6a The sectional view taken by line BB.

[0037] Figure 8 Show Figure 7 The sectional view of the valve core and valve stem has been removed.

[0038] Figure 9 A schematic diagram showing the positional relationship between the first sealing ring, the second sealing ring, and the annular sealing ring is provided.

[0039] Figure 10-13 A top view of the plug valve according to the invention is shown, illustrating the rotation process of the plug valve from the closed position to the open position.

[0040] Figure 14-15 A top view of the plug valve according to the invention is shown, illustrating the rotation process of the plug valve from the open position to the closed position. Detailed Implementation

[0041] Various embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that, in the drawings, the same reference numerals are assigned to components having substantially the same or similar structure and function, and repeated descriptions of them are omitted. The term "comprising A, B, C, etc." only indicates the order in which the included components A, B, C, etc., are arranged, and does not exclude the possibility of including other components between A and B and / or between B and C. In the following description, directional terms are used for convenience, where "longitudinal" refers to the direction of the length of the valve stem, around which the valve stem and valve core rotate, and the direction of rotation of the valve stem or valve core is called the direction of rotation; "up" and "down" refer to the longitudinal direction, respectively; the direction in which the valve stem extends from the valve body is called "up," and the opposite direction is called "down"; "upstream" refers to the direction from which the fluid originates or the direction from which rotation begins along the direction of rotation; and "downstream" refers to the direction in which the fluid is to flow or the direction to be reached by rotation along the direction of rotation. However, it should be noted that the above directions are merely illustrative examples, and the present disclosure is not limited thereto; various features may have different orientations under different orientations.

[0042] The accompanying drawings in this specification are schematic diagrams used to help illustrate the concept of the invention, and schematically show the shape of each part and their interrelationship.

[0043] Figures 1 to 3 Perspective view, side view, and sectional view of the plug valve 1 according to the present invention are shown respectively. The plug valve 1 includes a valve body 11, a valve core 12, and a valve stem 13. The valve core 12 is disposed within the valve body 11. The valve stem 13 is rotatably mounted to the valve body 11 and fixedly connected to the valve core 12. The valve stem 13 is driven by an external drive source (not shown), such as an electric motor, thereby enabling the valve stem 13 to drive the valve core 12 to rotate within the valve body between an open valve position and a closed valve position. The open valve position and the closed valve position differ by, for example, 90 degrees.

[0044] The valve body 11 includes a valve body 111 and a cap 112, the valve body defining a fluid inlet 113 and a fluid outlet 114. The valve body 111 includes a mounting hole located on its lower side, through which the valve core 12 passes during installation (see...). Figure 3 The valve core 12 is inserted into the valve body body. After the valve core 12 is installed into the valve body body, the cap 112 is used to close the mounting hole. A sealing ring 115 is provided between the cap 112 and the valve body body 111. A sealing ring 117 is provided between the valve stem 13 and the valve body body 111.

[0045] The valve core 12 includes a first valve plate 121, a second valve plate 122, and a connecting rod 123 connecting the first and second valve plates. The connecting rod 123 is fixedly connected to the valve stem 13, enabling the valve stem 13 to drive the valve core to rotate. In the closed position of the plug valve, the first valve plate 121 is positioned against the fluid inlet of the valve body, i.e., the first valve plate 121 is the upstream valve plate, and the second valve plate 122 is positioned against the fluid outlet of the valve body, i.e., the second valve plate 122 is the downstream valve plate.

[0046] like Figure 7As shown, the first end 1231 of the connecting rod 123 is connected to the first valve plate 121, and the second end 1232 is connected to the second valve plate 122. Specifically, the first end 1231 of the connecting rod is inserted into the first groove 1211 of the first valve plate 121, and there is a first gap between the first end 1231 of the connecting rod and the closed end of the first groove 1211. The second end of the connecting rod is inserted into the second groove 1221 of the second valve plate 122, and there is a second gap between the second end 1232 of the connecting rod and the closed end of the second groove 1221. Thus, when fluid entering through the fluid inlet pushes the first valve plate 121, due to the presence of the first gap, the first valve plate can move slightly away from the valve body relative to the connecting rod, thereby forming a small gap between the fluid inlet and the first valve plate 121 to allow fluid to enter the interior of the valve body. The fluid entering the valve body presses on the upstream side of the second valve plate 122 and thus pushes the second valve plate 122 against the inner surface of the valve body. Therefore, near the first end of the connecting rod, a first return spring 124 is disposed between the inner surfaces of the valve stem and the first valve plate 121 to bias the first valve plate 121 toward the inner surface of the valve body. Near the second end of the connecting rod, a second return spring 125 is disposed between the inner surfaces of the valve stem and the second valve plate 122 to bias the second valve plate 122 toward the inner surface of the valve body. For example, the first and second return springs can be conical springs, with the larger end of the conical spring contacting the first or second valve plate and the smaller end of the conical spring contacting the valve stem 13.

[0047] like Figure 3 As shown, in one embodiment, the plug valve 1 may further include a protective sleeve 14, which is fixedly installed to the valve body 111 and disposed between the valve core 12 and the valve body 111, i.e., the protective sleeve surrounds the valve core, allowing the valve core to rotate within the protective sleeve. The protective sleeve is formed, for example, of a wear-resistant or self-lubricating material, such as plastic, which avoids direct contact between the valve core and the valve body, prevents wear on the valve core, and ensures that the valve core can rotate normally without jamming.

[0048] The protective sleeve also includes a locating pin 146 for positioning the relative positions of the protective sleeve 14 and the valve body 11. The locating pin 146 is embedded, for example, in corresponding grooves formed within the protective sleeve 14 and the valve body 11, thereby fixing the protective sleeve 14 relative to the valve body 11.

[0049] like Figure 4 , 5 As shown in 6a-6b, the protective sleeve 14 includes a first opening 141 and a second opening 142. The first opening 141 is aligned with the fluid inlet 113 of the valve body, and the second opening 142 is aligned with the fluid outlet 114 of the valve body. In the circumferential direction of the rotation axis of the valve core 12, the middle portion of the opening walls of the first and second openings gradually recesses to both sides.

[0050] An annular mounting groove is provided on the outer surface of the protective sleeve. This annular mounting groove is a closed ring surrounding the protective sleeve, having a first portion extending a certain range around the outer peripheral surface of the protective sleeve above a first opening 141, a second portion extending a certain range around the outer peripheral surface of the protective sleeve below a second opening 142, and an intermediate portion extending obliquely around the outer surface of the protective sleeve to connect the first and second portions. The certain range exceeds the span between the first opening 141 and the second opening 142. Figure 6a and Figure 6b As shown. Therefore, in Figure 5 In the side view, the mounting groove forms a horizontal fold shape. An annular sealing ring 144 is disposed in the annular mounting groove. Specifically, the annular sealing ring 144 has a first portion 1441 located in the first part of the annular mounting groove, a second portion 1442 located in the middle part of the annular mounting groove, and a third portion 1443 located in the second part of the annular mounting groove.

[0051] like Figure 8 and 9 As shown, in addition, a first annular groove is provided on the inner surface of the protective sleeve. The first annular groove is provided in a first plane perpendicular to the longitudinal axis of the protective sleeve. The first plane where the first annular groove is located is different from the plane where the first part of the annular mounting groove is located. In the figure, the first plane where the first annular groove is located is located above the plane where the first part of the annular mounting groove is located, that is, higher than the first part. The first sealing ring 143 is provided in the first annular groove.

[0052] The inner surface of the protective sleeve is also provided with a second annular groove. The second annular groove is located in a second plane perpendicular to the longitudinal axis of the protective sleeve. The second plane where the second annular groove is located is different from the plane where the second part of the annular mounting groove is located. In the attached figure, the second plane where the second annular groove is located is located below the plane where the second part of the annular mounting groove is located, that is, below the position of the second part. The second sealing ring 145 is located in the second annular groove.

[0053] The first plane is offset from the first part, and the second opening is offset from the second part, which effectively reduces the thickness of the protective sleeve. The cooperation of the first sealing ring, the second sealing ring, and the annular sealing ring achieves a better sealing effect.

[0054] The valve body 11 also includes a stop configured to abut against the second valve plate 122 to prevent the outer surface of the second valve plate from moving away from the inner surface of the protective sleeve under fluid pressure. Specifically, during valve core rotation, the pressure of the fluid entering through the fluid inlet on the second valve plate may be unbalanced, which may cause a portion of the second valve plate to move away from the inner surface of the protective sleeve about the connecting rod 123. Therefore, the stop is configured to prevent such movement of the second valve plate.

[0055] like Figure 3 As shown, in this embodiment, the stop members include a first stop member 115 disposed on the valve body 111 and a second stop member 116 disposed on the stopcock cap. The second valve plate 122 has a valve plate body 1221 and a first mating member 1222 and a second mating member 1223 extending outward from both ends of the valve plate body along the longitudinal direction. Thus, the first stop member 115 is configured to slide against the first mating member 1222, and the second stop member 116 slides against the second mating member 1223, thereby preventing any part of the second valve plate from deviating from the inner surface of the protective sleeve during the rotation of the second valve plate. The stop members reduce the risk of leakage, thereby reducing the possibility of impurities adhering to the outer surface of the second valve plate.

[0056] The plug valve also includes a scraping structure configured to scrape the outer or sealing surface of the sealing component (i.e., the second valve disc) of the valve core during rotation, thereby removing impurities from the outer surface. Without a protective sleeve, the scraping structure can be located on the valve body; with a protective sleeve, the scraping structure is located on the sleeve, i.e., on the opposing surface where the valve disc makes sealing and sliding contact during rotation. The following description uses the example of the scraping structure being located on the protective sleeve. Furthermore, in the following description, the scraping structure is described as a groove on the inner surface of the protective sleeve; however, those skilled in the art will understand that the scraping structure can also take other forms, such as utilizing variations in the roughness of the inner surface of the protective sleeve, as long as the scraping function is achieved.

[0057] In the following description, the plug valve 1 includes a scraping structure 15 and another scraping structure 16, in Figure 10 In the top view shown, scraping structure 15 and another scraping structure 16 can be respectively disposed within the protective sleeves on the upstream and downstream sides of the second outlet in the rotation direction of the second valve plate. Scraping structure 15 is, for example, in the form of a first groove, having a first edge 151 configured as a first scraper and a second edge 152 configured as a second scraper. The other scraping structure 16 can be in the form of a second groove, having a first edge 161 configured as a scraper, while the second edge 162 does not function as a scraper in this example.

[0058] Figure 10 This indicates that the plug valve is in the closed position. Figure 11 This illustrates the scenario where the valve stem 13 drives the valve core 12 to rotate counterclockwise, for example, by 20 degrees. As can be seen from the figure, when... Figure 10 Rotate the position to Figure 11 During the positioning process, the first edge 161 of the second groove scrapes against a first portion of the outer surface of the second valve plate 122, which in... Figure 10S1 represents the position of the valve plate. At this time, the upper end of the outer surface of the second valve plate 122 is rotated to the first edge 151 of the first groove.

[0059] As the valve core continues to rotate counterclockwise by 40 degrees, it reaches... Figure 12 As shown, at the position of 60 degrees rotation, the second part S2 of the outer surface of the second valve plate 122 is scraped. When the valve core rotates to the position... Figure 13 During the valve open position shown, the first edge 151 of the first groove 15 scrapes the third portion S3 of the outer surface of the second valve plate 122, the third portion S3 including the second portion S2.

[0060] The valve core is rotated 20 degrees clockwise to reach... Figure 14 At the position shown, the fourth part S4 of the outer surface of the second valve plate 122 is scraped, when the valve core rotates to reach... Figure 15 When rotated 60 degrees as shown, the second edge 152 of the first groove 15 scrapes the fifth portion S5 of the outer surface of the second valve plate 122, the fifth portion comprising the fourth portion. Then, the valve core rotates to... Figure 10 The valve is closed as shown, and the outer surface of the second valve plate is further scraped. In fact, the first part S1, the third part S3 and the fifth part S5 together cover at least the entire area of ​​the outer surface of the second valve plate 122, thereby enabling the scraping of the outer surface of the second valve plate.

[0061] The above description is merely an example of one type of scraping, but those skilled in the art will understand that various forms of scraping can be achieved by reasonably designing the size and position of the first or second groove and the size of the outer surface of the second valve plate.

[0062] For example, another scraping structure can be omitted, that is, the second groove can be omitted, and only the scraping structure formed by the first groove can be provided, such that during the rotation of the second valve plate from the closed valve position to the open valve position, a portion of the outer surface of the second valve plate is scraped by the first edge of the first groove, while during the rotation of the second valve plate from the open valve position to the closed valve position, the remaining portion of the outer surface of the second valve plate is scraped by the second edge of the first groove.

[0063] For example, in the presence of another scraping structure, when the valve core rotates from the closed position to the open position, the first edge of the first groove is configured to scrape a portion of the outer surface of the second valve piece, and the first edge of the second groove is configured to scrape the remaining portion of the outer surface of the second valve piece.

[0064] By setting a grooved scraping structure, not only can impurities on the outer surface of the second valve plate be scraped off, but also, due to the grooves, the friction between the second valve plate and the protective sleeve when rotating inside the protective sleeve is reduced, thereby reducing torque and simultaneously reducing the sealing area G. Figure 10 As shown.

[0065] Although the scraping structure is described in this embodiment as an example of a groove with a scraping edge, the present disclosure is not limited thereto. For example, the scraping structure can also be implemented by changing the roughness of a portion of the opposing surface or by providing slightly protruding ridges.

[0066] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0067] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A plug valve, comprising: Valve body, the valve body including a fluid inlet and a fluid outlet; A valve core is disposed in the valve body and is rotatable between an open valve position and a closed valve position. The valve core includes a first valve plate and a second valve plate. In the closed valve position, the first valve plate closes the fluid inlet and the second valve plate closes the fluid outlet. as well as A first scraping structure is disposed on an opposing surface that slides in contact with the sealing surface of the second valve plate and is located on the rotation path of the second valve plate, and is configured to scrape the sealing surface of the second valve plate during valve core rotation. The valve core also includes a connecting rod, a first end of which is connected to a first valve plate, and a second end of which is connected to a second valve plate. The connecting rod is configured to move relative to the first and second valve plates. The valve body is provided with a stop member, which is configured to abut against the second valve plate to prevent the outer surface of the second valve plate from moving away from the relative surface with the connecting rod as the center under the action of fluid pressure. The first scraping structure includes a first scraping member and a second scraping member. The first scraping member is configured to scrape a portion of the sealing surface of the second valve plate when the valve core rotates from the closed position to the open position. The second scraping member is configured to scrape the remaining portion of the sealing surface of the second valve plate when the valve core rotates from the open position to the closed position. The first scraping structure includes a first groove, a first edge of the first groove forming a first scraping element, and a second edge of the first groove forming a second scraping element.

2. The plug valve as described in claim 1, characterized in that, The opposing surfaces are formed on the inner surface of the valve body.

3. The plug valve as described in claim 1, characterized in that, It also includes a protective sleeve that is fixedly installed to the valve body and disposed between the valve core and the valve body, the opposing surfaces being formed on the protective sleeve, the protective sleeve including a first opening and a second opening respectively communicating with the fluid inlet and the fluid outlet, the valve core rotating within the protective sleeve, such that the first valve plate and the second valve plate respectively open or close the first opening and the second opening.

4. The plug valve as described in claim 2 or 3, characterized in that, The plug valve further includes a second scraping structure, the first scraping structure being configured to scrape a portion of the sealing surface of the second valve plate when the valve core rotates from the closed position to the open position, and the second scraping structure being configured to scrape the remaining portion of the sealing surface of the second valve plate when the valve core rotates from the closed position to the open position.

5. The plug valve as described in claim 4, characterized in that, The first scraping structure includes a first groove disposed on the opposing surface, along the rotational direction of the valve core from the closed position to the open position, the first groove being disposed downstream of the fluid outlet, and the first groove including a first edge configured to scrape a portion of the sealing surface of the second valve plate when the valve core rotates from the closed position to the open position. The second scraping structure includes a second groove disposed on the opposing surface, along the rotational direction, on the upstream side of the fluid outlet, and includes a third edge configured to scrape the remaining portion of the sealing surface of the second valve plate when the valve core rotates from the closed position to the open position.

6. The plug valve as described in claim 2 or 3, characterized in that, The plug valve further includes a second scraping structure configured to scrape a first portion of the sealing surface of the second valve disc when the valve core rotates from the closed position to the open position, the first scraping structure configured to scrape a second portion of the sealing surface of the second valve disc when the valve core rotates from the closed position to the open position, and a third portion of the outer surface of the second valve disc when the valve core rotates from the open position to the closed position, the first portion, the second portion and the third portion together covering at least the entire area of ​​the sealing surface of the second valve disc.

7. The plug valve as described in claim 6, characterized in that, The first scraping structure includes a first groove disposed on the opposing surface, along the rotational direction of the valve core from the closed position to the open position, the first groove being disposed downstream of the fluid outlet, and the first groove including a first edge and a second edge, the first edge being configured to scrape a second portion of the sealing surface of the second valve plate when the valve core rotates from the closed position to the open position, and the second edge being configured to scrape a third portion of the sealing surface of the second valve plate when the valve core rotates from the open position to the closed position. The second scraping structure includes a second groove disposed on the opposing surface, the second groove being disposed upstream of the fluid outlet along the rotational direction, and including a third edge, the third edge being configured to scrape a first portion of the sealing surface of the second valve plate when the valve core rotates from the closed position to the open position.

8. The plug valve as described in claim 3, characterized in that, The valve body includes a valve body body for accommodating the valve core and a stopcock cap that is detachably mounted to the valve body body.

9. The plug valve as claimed in claim 1, characterized in that, The stopper includes a first stopper disposed on the valve body and / or a second stopper disposed on the stopcock cover.

10. The plug valve as claimed in claim 9, characterized in that, The second valve plate has a valve plate body and a first mating member and a second mating member extending outward from both ends of the valve plate body. The first stop member abuts against the first mating member, and the second stop member abuts against the second mating member.

11. The plug valve as claimed in claim 3, characterized in that, An annular mounting groove is provided on the outer surface of the protective sleeve. The annular mounting groove has a fourth portion extending along the outer surface above a first opening, a fifth portion extending along the outer surface below a second opening, and a middle portion extending obliquely on the outer surface to connect the fourth portion and the fifth portion respectively. An annular sealing ring is disposed in the annular mounting groove. A sixth portion of the annular sealing ring is disposed in the fourth portion of the annular mounting groove, a seventh portion of the annular sealing ring is disposed in the fifth portion of the annular mounting groove, and an eighth portion of the annular sealing ring is disposed in the middle portion of the annular mounting groove.

12. The plug valve as claimed in claim 11, characterized in that, The inner surface of the protective sleeve is provided with a first annular groove, which is located in a first plane perpendicular to the longitudinal axis of the protective sleeve. The first plane in which the first annular groove is located is different from the plane in which the fourth part of the annular mounting groove is located. The first sealing ring is located in the first annular groove.

13. The plug valve as claimed in claim 12, characterized in that, The inner surface of the protective sleeve is provided with a second annular groove, which is located in a second plane perpendicular to the longitudinal axis of the protective sleeve. The second plane in which the second annular groove is located is different from the plane in which the fifth part of the annular mounting groove is located. The second sealing ring is located in the second annular groove.

14. The plug valve as claimed in claim 1, characterized in that, The first valve plate has a first groove for receiving a first end of the connecting rod, and the second valve plate has a second groove for receiving a second end of the connecting rod. There is a first gap between the first end of the connecting rod and the closed end of the first groove, and a second gap between the second end of the connecting rod and the closed end of the second groove, so that the connecting rod can move relative to the first valve plate and the second valve plate.

15. The plug valve as claimed in claim 14, characterized in that, The valve core also includes a first return spring and a second return spring. The first return spring is connected between the inner surface of the first valve plate and the valve stem, and the second return spring is connected between the inner surface of the second valve plate and the valve stem.

16. The plug valve as claimed in claim 8, characterized in that, The valve body has a mounting hole through which the valve core passes. The stopcock cap is partially inserted into the protective sleeve to close the mounting hole. Multiple sealing rings are disposed between the protective sleeve and the stopcock cap, between the stopcock cap and the valve body, and between the top of the protective sleeve and the valve body.

17. The plug valve as claimed in claim 3, characterized in that, The protective cover is a plastic protective cover.

18. The plug valve as claimed in claim 3, characterized in that, The plug valve also includes a positioning pin, which is inserted into the protective sleeve and the valve body to position the relative positions of the protective sleeve and the valve body.

19. A water-cooled air conditioner, characterized in that, The water-cooled air conditioner includes a stopcock valve as described in any one of claims 1-18.

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