control valve

Abstract

The application discloses a control valve, comprising a valve body, a rotating shaft and a valve core, the control valve comprises a sealing element, the sealing element is sleeved on the outer periphery of the rotating shaft, the rotating shaft is provided with a groove, and at least part of the sealing element is located in the groove; the sealing element is provided with a main body part, the main body part is provided with a first part and a second part, and the second part is away from the rotating shaft relative to the first part; the sealing element is provided with a first part, a second part and a third part, the material of the first part and the second part comprises graphite, the first part is limited in the first part, the first part is in sealing arrangement with the outer periphery of the rotating shaft, the second part is limited in the second part, and the second part is in sealing arrangement with the wall part of the valve body; in the axial direction of the rotating shaft, at least part of the third part is limited in the second part, and the third part is arranged away from the valve core relative to the second part. The control valve is good in sealing performance.

Description

Technical Field

[0001] This invention relates to the field of fluid control, and more specifically to a control valve. Background Technology

[0002] Many valves are used in refrigeration systems. With increasing environmental concerns, CO2 is being considered as a new refrigerant for automotive air conditioning. Due to CO2's transcritical cycle, its operating pressure is approximately 10 times higher than that of the traditional refrigerant R134a. Conventional valves typically use rubber for sealing, but rubber's high CO2 permeability under high pressure and temperature results in poor sealing, failing to meet system requirements.

[0003] In view of this, and also considering the excellent sealing properties of graphite, graphite is used as the sealing element. Since the system pressure is very high when CO2 is used as the refrigerant, the valve body used in the system is generally made of metal. When graphite is used to seal metal, there will be a certain amount of moisture in the air, which will have a certain corrosion inhibition effect on the contact surface between graphite and metal. Once corrosion inhibition occurs, the metal at the sealing point in contact with graphite will be corroded, affecting the sealing performance. Summary of the Invention

[0004] To provide a control valve that exhibits good sealing performance under high pressure and high temperature environments, the following technical solution is provided:

[0005] A control valve includes a valve body and a valve core assembly, the valve core assembly including a rotating shaft and a valve core, and the control valve including a seal sleeved around the outer periphery of the rotating shaft.

[0006] The seal has a main body portion, which has a first portion and a second portion disposed along the radial extension direction of the rotating shaft. The first portion is adjacent to the rotating shaft relative to the second portion, and the second portion is opposite to the rotating shaft relative to the first portion.

[0007] The seal has a first part, a second part, and a third part. The first part and the second part are made of graphite. The first part is located at the first location and is sealed to the outer periphery of the rotating shaft. The second part is located at the second location and is sealed to the wall of the valve body. Along the axial direction of the rotating shaft, at least a portion of the third part is located at the second location and the third part is located away from the valve core relative to the second part.

[0008] In this way, the control valve has good sealing performance. Attached Figure Description

[0009] Figure 1 This is a simplified structural diagram of a control valve;

[0010] Figure 2 for Figure 1 Enlarged diagram of A in the middle;

[0011] Figure 3 This is a schematic diagram of the cross-sectional structure of a sealing element;

[0012] Figure 4 This is a schematic diagram of the cross-sectional structure of another type of seal.

[0013] Figure 5 for Figure 4 A three-dimensional structural schematic diagram of the seal shown;

[0014] Figure 6 This is a cross-sectional structural diagram of another type of seal;

[0015] Figure 7 for Figure 6 A three-dimensional structural schematic diagram of the seal shown.

[0016] Figure 8 This is a cross-sectional structural diagram of another type of seal;

[0017] Figure 9 This is a cross-sectional structural diagram of another type of seal;

[0018] Figure 10 This is a cross-sectional structural diagram of another type of seal;

[0019] Figure 11 This is a cross-sectional structural diagram of another type of seal;

[0020] Figure 12 for Figure 1 Another cross-sectional view of section A;

[0021] The components include: valve body 11, rotating shaft 12, valve core 13, seal 14, groove 121, fixing bracket 111, seat portion 112, main body portion 141, first part 142, second part 143, third part 144, fourth part 145, first section 146, second section 147, and third section 148.

[0022] First annular groove 1421, second annular groove 1431, third annular groove 1441, first annular corner groove 149, fourth annular groove 1432, sixth annular groove 1451, second annular corner groove 150, first sealing surface 1481, second sealing surface 1482, first sub-section 1483, second sub-section 1484, third sub-section 1485, fourth sub-section 1486, first branch 1461, second branch 1462. Detailed Implementation

[0023] The technical solution of the specific embodiments is described below with reference to the accompanying drawings. Figures 1-2 , Figure 1 A simplified structure of a control valve is illustrated. The control valve includes a valve body 11 and a valve core assembly, the valve core assembly including a shaft 12 and a valve core 13, and the control valve includes a seal 14 fitted around the outer periphery of the shaft 12. In this embodiment, the shaft 12 has a groove 121, and at least a portion of the seal 14 is located in the groove 121.

[0024] In other embodiments, the groove 121 may also be located on the valve body 11.

[0025] Figure 1 A cross-sectional view of a ball valve is shown. The valve body 11 includes a fixing frame 111 and a seat 112. The fixing frame 111 and the seat 112 are sealed together. At least a portion of the rotating shaft 12 is located on the fixing frame 111. The sealing element 14 is sealed together with the fixing frame 111. The valve core 13 is a spherical core. The rotating shaft 12 drives the spherical core to rotate.

[0026] It should be understood that the control valve of this technical solution, in addition to Figure 1 Besides the ball valve illustrated, other types of valves can also be used, including but not limited to needle valves, butterfly valves, and disc valves. The function of a control valve can be multiple, such as shut-off or regulation. No limitations are imposed here.

[0027] The seal 14 has a main body 141, which has a first part 142, a second part 143, a third part 144 and a fourth part 145. The first part 142 and the second part 143 are arranged along the radial extension direction of the rotating shaft 12. The first part 142 is adjacent to the rotating shaft 12 relative to the second part 143. The second part 143 is away from the rotating shaft 12 relative to the first part 142. The third part 144 and the fourth part 145 face the sidewall corresponding to the groove 121 and are along the axial direction of the rotating shaft 12. The third part 144 is away from the valve core 13 relative to the fourth part 145.

[0028] The sealing element 14 has a first portion 146 and a second portion 147, the first portion 146 and the second portion 147 are made of graphite, the first portion 146 is located at the first part 142 and is sealed to the outer periphery of the rotating shaft 12, the second portion 147 is located at the second part 143 and is sealed to the wall of the valve body 11.

[0029] The seal 14 also has a third portion 148, at least a portion of which is confined to the second portion 143 along the axial direction Z of the rotating shaft, and the third portion is disposed away from the valve core relative to the second portion. The first portion being confined to the first portion and the second portion being confined to the second portion can be achieved by means of detachable fixation, non-detachable fixation, detachable limiting, or non-detachable limiting, etc.

[0030] Since the control valve needs to be used in a CO2 system, where the fluid pressure and temperature are high, the materials of Part 146 and Part 147 include graphite. Under high temperature and pressure, graphite has low permeability to CO2, which can help seal the control valve. The inclusion of graphite in Part 146 and Part 147 means, but is not limited to, single-component graphite. Graphite can also be modified, for example, by adding clay, metal wire, binder, corrosion-resistant particles, etc.

[0031] The first part 146 contacts and seals the rotating shaft 12, and the second part 147 contacts and seals the valve body 11. The first part 146 and the second part 147 are located on opposite sides of the rotating shaft 12 in the radial direction. The first part 146 and the second part 147 are generally annular, so the seal 14 can effectively seal the rotating shaft 12 and the valve body 11. The first part 146 is made of graphite, and the second part is also made of graphite. When the rotating shaft rotates relative to the valve body, the first and second parts, due to the lubrication and sealing properties of graphite, not only facilitate the rotation of the rotating shaft, but also effectively seal it.

[0032] The main body 141 is annular and made of metal. The material of the third part 148 differs from that of the first part 146 and the second part 147. The material of the third part 148 includes at least one selected from synthetic rubber, nylon plastic, fluororubber, and natural rubber. The material of the third part 148 can be a common sealing material. The function of the third part 148 is to prevent moisture from the external environment from entering the sealing parts of the first part 146 and the second part 147 of the control valve. The material of the third part 148 includes non-graphite materials, with the greater function of preventing moisture from entering. In this text, "annular main body" means that the main body is generally annular, but includes slightly concave or convex structures.

[0033] The main body 141 of the seal 14 is made of metal. Since graphite is inherently fragile, and this control valve is used in a high-temperature, high-pressure environment where it is subjected to significant pressure, pure graphite material is prone to breakage during the compression process, affecting the seal. Furthermore, even without breakage, localized debris may be generated during compression, creating impurities within the system and impacting its operation. Using metal as the skeleton material of the seal 14 provides strong support for the first part 146 and the second part 147, improving the seal 14's compressive strength and overall strength.

[0034] Since the control valve can be used in air conditioning systems, when the outside air is humid, moisture in the air can enter the sealing part through the gaps in the valve body 11, forming an electrolytic cell at the contact point between graphite and metal, leading to metal corrosion and affecting the seal. However, in this control valve, at least a portion of the third part 148 is located within the second part, and the third part is positioned relatively far from the valve core. The third part 148 is made of a sealing material different from graphite, which can be used to block moisture in the environment, reduce moisture at the contact point between graphite and metal, reduce metal corrosion, and improve sealing performance.

[0035] The first part 146 and the main body 141 are fixed together by means of adhesive or by means of mechanical structure such as edge binding. In this article, the first part 146 and the main body 141 are fixed together by means of non-removable fixation or fixation by means of detachable fixation.

[0036] As one implementation method, refer to Figure 3 , Figure 3 A schematic diagram of the seal 14' is shown, with at least a portion of the third part confined within the third location. The main body 141 has a first annular groove 149, and the third part 148 is confined within the first annular groove 149. The third part 148 has a first sealing surface 1481 and a second sealing surface 1482. The first sealing surface 1481 is located between the third location 144 and the sidewall corresponding to the groove 121, and the second sealing surface 1482 is located between the second location 143 and the wall of the valve body 11. The third part 148 can be looped around the first annular groove 149 of the main body 141 and confined within it. When the seal 14' is placed in the valve body 11, the third part 148 effectively intercepts water vapor.

[0037] There are two first annular corner grooves 149, located on both sides of the second part 147 along the axial direction of the rotating shaft 12. The third part is located at the position of the first annular corner groove 149. Through the sealing effect of the first sealing surface and the second sealing surface, the influence of external environment and possible moisture in the system on the graphite sealing part can be effectively blocked, thereby improving the sealing performance.

[0038] In this article, the axial direction of the rotating shaft 12 refers to... Figure 2 Up Z direction.

[0039] The first part 142 has a first annular groove 1421, the first portion 146 is embedded in the first annular groove 1421, the first part 142 is fixed to the first portion 146, and the first portion 146 protrudes from the first part 142.

[0040] The first part may also omit the first annular groove 1421, and the first part may be directly fixed to the main body by adhesive bonding or other methods. Alternatively, the first part 146 and the main body 141 may be connected by riveting, or the first part and the main body 141 may be first glued together, and then the edge of the main body 141 may be riveted to the first part 146, which is beneficial for the firm fixation between the main body 141 and the first part 146.

[0041] As another implementation method, refer to Figure 4 and Figure 5 , Figure 4 , Figure 5 A schematic diagram of the seal 14'' is shown. The second portion 143 has a second annular groove 1431, and the second part 147 is embedded in the second annular groove 1431. The second part 147 is fixed to the second portion 143 and protrudes from the second portion 143. The first part 146 protrudes from the first portion 142, and the second part 147 protrudes from the second portion 143. When the seal 14 is between the rotating shaft 12 and the valve body 11, the sealing portion is located at the first part 146 and the second part 147. This ensures that the most important sealing portion of the control valve is sealed through the first part 146 and the second part 147, effectively preventing high-temperature, high-pressure CO2 from penetrating the sealing portion and providing good sealing performance.

[0042] The third portion 144 has a third annular groove 1441, the third part 148 is embedded in the third annular groove 1441, the third portion 144 is fixed to the third part 148, and the third part 148 protrudes from the third portion 144. The third part 148 protrudes from the third portion 144, and the seal of the third portion 144 is formed in the third part 148.

[0043] The second portion 143 has a fourth annular groove 1432. In the axial direction of the rotating shaft 12, the fourth annular groove 1432 is opposite to the valve core 13 relative to the second annular groove 1431. The third portion 148 is received in the fourth annular groove 1432 and protrudes from the second portion 143. The third portion in the fourth annular groove 1432 can be used to prevent moisture from the external environment from entering the contact area between the first portion 147 and the valve body, thereby reducing corrosion.

[0044] The first part 146 and the main body 141 are directly fixed together by adhesive. The first part 146 is a ring structure that is attached to the inner ring of the main body 141.

[0045] In another embodiment, the second portion also has a fifth annular groove, along the axial direction of the rotating shaft 12, with the fourth annular groove 1432 and the fifth annular groove located on both sides of the second portion 147. For example, see... Figure 6 A portion of the third part is housed in the fifth annular groove, thus the third part in the fifth annular groove can be used to prevent water vapor in the system from entering the contact area between the first part 147 and the valve body, further reducing corrosion.

[0046] In the radial direction of the rotating shaft 12, when the seal 14 is not assembled to the valve body 11, the thickness of the second part 147 is greater than the thickness of the third part 148.

[0047] As another implementation method, refer to Figure 6 and Figure 7 , Figure 6 , Figure 7 A schematic diagram of the seal 14''' is shown. The fourth portion 145 has a sixth annular groove 1451. A portion of the third portion 148 is received in the sixth annular groove 1451, and the third portion 148 protrudes from the fourth portion 145.

[0048] In the radial direction of the rotating shaft 12, when the seal 14 is not assembled to the valve body 11, the thickness of the second part 147 is greater than the thickness of the third part 148.

[0049] As another implementation method, refer to Figure 8 , Figure 8 A schematic diagram of the sealing element 14'''' is shown. The first part 146 is located on the inner periphery of the main body 141 and can be fixed to the main body 141 by adhesive.

[0050] The main body 141 has a first annular corner groove 149, and the third part 148 is confined within the first annular corner groove 149. The third part 148 has a first sealing surface 1481 and a second sealing surface 1482. The first sealing surface 1481 is located between the third part 144 and the side wall corresponding to the groove 121, and the second sealing surface 1482 is located between the second part 143 and the wall of the valve body 11. The third part 148 can be looped around the first annular corner groove 149 of the main body 141 and confined by the first annular corner groove 149. When the seal 14' is placed in the valve body 11, the third part 148 can effectively intercept water vapor.

[0051] There are two first annular corner grooves 149, located on both sides of the second part 147 along the axial direction of the rotating shaft 12. The third part is located at the position of the first annular corner groove 149. Through the sealing effect of the first sealing surface and the second sealing surface, the influence of external environment and possible moisture in the system on the graphite sealing part can be effectively blocked, thereby improving the sealing performance.

[0052] Alternatively, the second part 147 and the main body 141 can be positioned by adhesive bonding or other methods described above. Along the axial direction Z of the shaft, the third part 148 is disposed on both sides of the second part 147, with one side of the third part 148 abutting against the second part 147. This not only serves to prevent moisture from entering the sealed area of ​​the second part 147 but also to further position the second part 147, thus improving the positioning between the second part 147 and the main body 141.

[0053] As another implementation method, refer to Figure 9 , Figure 9 The schematic diagram shows the sealing element 14'''''. The first part 146 is located on the inner periphery of the main body 141, and the first part 146 can be fixed to the main body 141 by adhesive.

[0054] The main body 141 has a second annular corner groove 150, and a third part 148 is confined within the second annular corner groove 150. There are two second annular corner grooves along the axial direction of the rotating shaft. The second annular corner grooves 150 are respectively disposed on both sides of the first part 146. The first part 146 and the main body 141 are fixedly disposed, and one side of the third part abuts against the first part 146, and the other side of the third part abuts against the first part 146. This not only serves to block moisture at the sealing position of the first part 146, but also to further confine the first part 146, improving the confinement between the first part 146 and the main body 141. As another embodiment, see... Figure 10 , Figure 10The schematic diagram shows the sealing element 14''''''. The first part 146 includes a first portion 1461 and a second portion 1462. The first portion 1461 and the second portion 1462 are located on the inner periphery of the main body 141. The first portion 1461 and the second portion 1462 are fixed to the main body 141. In this embodiment, the main body 141 has two first annular grooves 1421. The first portion 1461 and the second portion 1462 are respectively located in one of the first annular grooves. The first portion and the second portion protrude from the inner peripheral wall of the main body 141. In this way, the rotating shaft can rotate relative to the first portion and the second portion. Along the axial direction of the rotating shaft, the sum of the heights of the first portion and the second portion is less than the height of the main body. In this way, the contact area between the rotating shaft and the first portion can be reduced, and the wear of the first portion can be reduced.

[0055] As another implementation method, refer to Figure 11 , Figure 11 A schematic diagram of the sealing element 14''''''' is shown. The second part 147 is located on the outer periphery of the main body 141 and is fixed to the main body 141. The third part 148 includes a first sub-part 1483 and a second sub-part 1484. Along the axial direction of the rotating shaft, the first sub-part 1483 and the second sub-part 1484 are respectively disposed on both sides of the second part 147. One side of the second part 147 abuts against the first sub-part 1483, and the other side of the second part 147 abuts against the second sub-part 1484. The first sub-part 1483 is fitted around the outer periphery of the main body 141 and is fixed to the main body 141. The second sub-part 1484 is fitted around the outer periphery of the main body 141 and is fixed to the main body 141. The first sub-part 1483 and the second sub-part 1484 can be made of materials such as silicone or rubber. The first and second sub-parts can not only prevent moisture from entering the sealing part of the second part 147, but also limit the second part 147, which is more conducive to the fixation of the structure and convenient for installation.

[0056] Furthermore, the third part 148 may also include a third sub-part 1485 and a fourth sub-part 1486. ​​The third sub-part 1485 and the fourth sub-part 1486 are located within the inner circumference of the main body 141 and are fixed to the main body 141. Along the axial direction of the rotating shaft, the third sub-part 1485 and the fourth sub-part 1486 are respectively disposed on both sides of the first part 146. One side of the first part 146 abuts against the third sub-part 1485, and the other side of the first part 146 abuts against the fourth sub-part 1486. ​​The third and fourth sub-parts can also be made of materials such as rubber, which can prevent moisture from entering the sealing portion of the first part 146 and can also be used to limit the position of the first part 146, facilitating the installation and fixation of the first part. For other embodiments, see [reference needed]. Figure 12There are two seals 14, which are fitted around the outer circumference of the rotating shaft. The seals 14 are open ring structures, that is, approximately ring structures with notches. The seals 14 are defined as an upper seal and a lower seal. The notches of the upper seal and the lower seal are not in the same position in the axial direction of the rotating shaft. This makes it easy for the seals 14 to be embedded in the main body 141. The two-layer seals also make the seals 14 have good sealing performance and can be used in high-pressure and high-temperature environments such as CO2.

[0057] It should be noted that although this specification has described the present invention in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify, combine or make equivalent substitutions to the present invention, and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A control valve, comprising a valve body (11) and a valve core assembly, characterized in that, The valve core assembly includes a rotating shaft (12) and a valve core (13), and the control valve includes a seal (14) that is fitted around the outer periphery of the rotating shaft (12). The seal (14) has a main body (141), the main body (141) has a first part (142) and a second part (143) arranged in a radially extending direction along the rotating shaft (12), the first part (142) is adjacent to the rotating shaft (12) relative to the second part (143), and the second part (143) is away from the rotating shaft (12) relative to the first part (142). The seal (14) has a first part (146), a second part (147) and a third part (148), the third part (148) being made of a non-graphite sealing material; the first part (146) and the second part (147) are made of graphite, the first part (146) is located at the first location (142), the first part (146) is sealed to the outer periphery of the shaft (12), the second part (147) is located at the second location (143), the second part (147) is sealed to the wall of the valve body (11); along the axial direction of the shaft (12), at least a portion of the third part (148) is located at the second location (143) and the third part (148) is located away from the valve core (13) relative to the second part (147).

2. The control valve according to claim 1, characterized in that, The main body is ring-shaped and made of metal. The material of the third part is different from that of the first and second parts. The material of the third part includes at least one selected from synthetic rubber, nylon plastic, fluororubber, and natural rubber.

3. The control valve according to claim 1, characterized in that, The first part has a first annular groove, the first portion is embedded in the first annular groove, the first part is fixed to the first portion, and the first portion protrudes from the first part; The second part has a second annular groove, the second portion is embedded in the second annular groove, the second portion is fixed to the second part, and the second portion protrudes from the second part.

4. The control valve according to claim 1, 2, or 3, characterized in that, The rotating shaft (12) has a groove (121), and at least a portion of the seal (14) is located in the groove (121); the main body includes a third portion and a fourth portion, the third portion and the fourth portion facing the sidewall corresponding to the groove, and along the axial direction of the rotating shaft, the third portion is away from the valve core relative to the fourth portion; at least a portion of the third portion is limited to the third portion.

5. The control valve according to claim 4, characterized in that, The main body has a first annular corner groove, the third part is limited to the first annular corner groove, the third part has a first sealing surface and a second sealing surface, the first sealing surface is located between the third part and the side wall corresponding to the groove, and the second sealing surface is located between the second part and the wall of the valve body.

6. The control valve according to claim 4, characterized in that, The third part has a third annular groove, the third portion is embedded in the third annular groove, the third part is fixed to the third portion, and the third portion protrudes from the third part.

7. The control valve according to claim 3, characterized in that, The second portion has a fourth annular groove, which is located away from the valve core relative to the second annular groove in the axial direction of the rotating shaft. The third portion is received in the fourth annular groove and protrudes from the second portion.

8. The control valve according to claim 7, characterized in that, The second part also has a fifth annular groove, and the fourth and fifth annular grooves are located on both sides of the second part along the axial direction of the rotating shaft.

9. The control valve according to claim 4, characterized in that, The fourth portion has a sixth annular groove, a part of the third portion is received in the sixth annular groove, and the third portion protrudes from the fourth portion.

10. The control valve according to claim 3, characterized in that, The second part is located on the outer periphery of the main body and is fixed to the main body; the third part includes a first sub-part and a second sub-part. Along the axial direction of the rotating shaft, the first sub-part and the second sub-part are located on both sides of the second part. One side of the second part abuts against the first sub-part, and the other side of the second part abuts against the second sub-part. The first sub-part is fitted around the outer periphery of the main body and is fixed to the main body. The second sub-part is fitted around the outer periphery of the main body and is fixed to the main body.

11. The control valve according to claim 10, characterized in that, The third part includes a third sub-part and a fourth sub-part. The third sub-part and the fourth sub-part are located on the inner periphery of the main body and are fixed to the main body. Along the axial direction of the rotating shaft, the third sub-part and the fourth sub-part are disposed on both sides of the first part. One side of the first part abuts against the third sub-part, and the other side of the first part abuts against the fourth sub-part.

12. The control valve according to any one of claims 1-3 or 5-11, characterized in that, The valve body includes a fixed frame and a seat portion, the fixed frame and the seat portion are sealed together, at least a portion of the rotating shaft is located on the fixed frame, the sealing element is sealed together with the fixed frame, the valve core is a spherical core, and the rotating shaft drives the spherical core to rotate.

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