Dynamic sealing structure of refrigerant multi-way valve

Abstract

The utility model discloses a dynamic sealing structure of a refrigerant multi-way valve, which comprises a valve casing, a plurality of through holes, a plurality of sealing rings, a plurality of sealing rings and a plurality of sealing rings, wherein the valve casing is provided with a plurality of through holes communicated with an inner cavity of the valve casing and externally connected with pipelines; the valve element is installed in an inner cavity of the valve shell in a sliding fit mode in the mode that the valve element can be driven to slide in the axial direction, a plurality of grooves are formed in the peripheral face of the valve element at intervals in the axial direction, annular grooves are formed in the two ends, corresponding to the grooves, of the wall face of the inner cavity of the valve shell in the axial direction of the valve element respectively, and sealing rings are arranged in the annular grooves. Extrusion is formed between the inner diameter face of the sealing ring and the peripheral face of the valve element. According to the dynamic sealing structure of the refrigerant multi-way valve, each sealing ring can correspondingly complete effective sealing of the corresponding groove, so that each through hole can be correspondingly communicated in a leakage-free mode through the corresponding groove, the sealing rings do not slide along with the valve element, rubbing between the sealing rings and the cut edges of the bottoms of the through holes is avoided, and the sealing performance of the refrigerant multi-way valve is improved. The sealing reliability is improved; certainly, the risk that residues fall off from the cut edge of the bottom of the through hole is also reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile component structure design, and in particular relates to a refrigerant multi-way valve dynamic sealing structure. Background Art

[0002] The refrigerant multi-way valve is an important component of the automobile air-conditioning system. It cooperates with the external pipeline connection to realize the flow direction control of the refrigerant in the automobile air-conditioning system, and then completes the switching of the hot and cold modes of the air-conditioning system. The existing refrigerant multi-way valve is generally composed of a valve body shell and a valve core slidably arranged in the valve body shell. The valve body shell is provided with a plurality of through holes connected to the inner cavity of the valve body for external pipelines. The valve core is provided with a plurality of grooves. Relatively independent sealed chambers are formed between the grooves and the wall surface of the inner cavity of the valve body. When the valve core slides to different positions, the corresponding through holes are connected through the sealed chambers at the corresponding positions. Since the refrigerant has high-temperature and high-pressure sections in the pipeline system, the sealing performance requirements between each sealed chamber are relatively high. If the sealing structure is damaged, the refrigerant is prone to flow and heat, which affects the normal operation of the air-conditioning system. In the prior art, the corresponding sealing between adjacent sealed chambers is generally completed by fixing an O-ring on the outer peripheral surface of the valve core, and the O-ring moves with the valve core to form a dynamic seal. In such a structure, the O-ring is easily damaged when passing through the through hole, especially when there are flashes or burrs at the bottom of the through hole that are inconvenient to process or not processed properly, which makes it easier to damage the O-ring, causing the refrigerant to flow, and in severe cases, the entire part to fail. In addition, the residues dropped from the cutting edge will also affect the cleanliness and noise of the system.

[0003] Therefore, there is an urgent need to improve the design of the sealing structure of the existing refrigerant multi-way valve in order to improve the reliability of the sealing structure, thereby improving the overall reliability of the refrigerant multi-way valve. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a dynamic sealing structure for a refrigerant multi-way valve, which can effectively reduce damage to the sealing components, improve the sealing reliability, and thus enhance the overall reliability of the refrigerant multi-way valve.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a refrigerant multi-way valve dynamic sealing structure, comprising: a valve housing, the valve housing having a plurality of through holes connected to the inner cavity of the valve housing for external piping; a valve core, the valve core is slidably mounted in the inner cavity of the valve housing in a manner that can be driven axially to slide, a plurality of grooves are arranged on the outer peripheral surface of the valve core at axial intervals, annular grooves are respectively arranged at both ends of the valve core along the axial direction of the corresponding grooves on the wall surface of the inner cavity of the valve housing, a sealing ring is arranged in the annular groove, and extrusion is formed between the inner diameter surface of the sealing ring and the outer peripheral surface of the valve core.

[0006] Furthermore, the cross section of the sealing ring is rectangular.

[0007] Furthermore, a plurality of annular protrusions are evenly distributed on the inner diameter surface of the sealing ring along its own axial direction.

[0008] Furthermore, the cross section of the annular protrusion is V-shaped, and the tip of the annular protrusion has a rounded transition.

[0009] Furthermore, the transition portion between the groove and the outer peripheral surface of the valve core is a rounded transition structure.

[0010] Furthermore, the axial width of the annular groove is greater than the axial thickness of the sealing ring.

[0011] Furthermore, the difference between the axial width of the annular groove and the axial thickness of the sealing ring ranges from 1 mm to 4 mm.

[0012] Furthermore, the sealing ring is made of EPDM rubber.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] In the dynamic sealing structure of the refrigerant multi-way valve provided by the utility model, each sealing ring can correspondingly complete the effective sealing of the corresponding groove, thereby ensuring that each through hole can achieve corresponding leakage-free connection through the corresponding groove position. Since the sealing ring is arranged on the valve housing, when the valve core moves, the sealing ring does not slide with the valve core, so that the sealing ring will not pass through the position of the through hole and will not be scratched with the bottom cut edge of the through hole, which effectively reduces the risk of damage to the sealing ring and improves the sealing reliability; of course, it also reduces the risk of residues falling from the bottom cut edge of the through hole, thereby improving the overall reliability of the refrigerant multi-way valve as a whole.

[0015] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and research, or can be taught from the practice of the present invention to some extent. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of the utility model.

[0017] Figure 2 for Figure 1 A partial enlarged view of the center

[0018] Figure 3 Schematic diagram of the cross-section structure of the sealing ring

[0019] Figure numerals: 1-valve housing; 101-through hole; 102-annular groove; 2-valve core; 201-groove; 201a-rounded transition structure; 3-sealing ring; 301-annular protrusion; 301a-tip. DETAILED DESCRIPTION

[0020] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only used to illustrate the basic concept of the present invention, and the following embodiments and the features in the embodiments can be combined with each other without conflict.

[0021] See also Figure 1-3 This embodiment discloses a refrigerant multi-way valve dynamic seal structure, including:

[0022] A valve housing 1, wherein the valve housing 1 has a plurality of through holes 101 communicating with the inner cavity of the valve housing 1 for external pipes, wherein the through holes 101 are also valve ports of the multi-way valve;

[0023] The valve core 2 is installed in the inner cavity of the valve housing 1 in a sliding manner so as to be driven to slide axially. A plurality of grooves 201 are arranged at intervals along the axial direction on the outer peripheral surface of the valve core 2. The inner cavity wall of the valve housing 1 is provided with annular grooves 102 at both ends of the valve core 2 along the axial direction corresponding to the grooves 201. A sealing ring 3 is arranged in the annular groove 102. An extrusion is formed between the inner diameter surface of the sealing ring 3 and the outer peripheral surface of the valve core 2. Usually, the valve core 2 is installed in the inner cavity of the valve housing 1 with a clearance fit, and can be driven to move by structures such as solenoid valves and pilot valves. When the valve core 2 moves to a certain position, the corresponding through hole 101 corresponding to the position of the groove 201 can be connected. The specific number and distribution of the through holes 101, as well as the corresponding position relationship between the grooves 201 and the through holes 101, can be determined according to the control logic of the hot and cold switching pipeline of the automobile air-conditioning system, and can be designed with reference to the existing conventional refrigerant multi-way valve structure. The specific connection relationship of the through hole 101 is not described here. The valve core 2 is preferably cylindrical.

[0024] In the above structural design, each sealing ring 3 can correspondingly complete the effective sealing of the corresponding groove 201, thereby ensuring that each through hole 101 can achieve corresponding leakage-free connection through the corresponding groove 201. Since the sealing ring 3 is arranged on the valve housing 1, when the valve core 2 moves, the sealing ring 3 does not slide with the valve core 2, so that the sealing ring 3 will not pass through the position of the through hole 101, and will not be scratched with the bottom cut edge of the through hole 101, which effectively reduces the risk of damage to the sealing ring 3 and improves the sealing reliability; of course, it also reduces the risk of residue falling from the bottom cut edge of the through hole 101, thereby improving the overall reliability of the refrigerant multi-way valve.

[0025] In this embodiment, the cross-section of the sealing ring 3 is rectangular, and the contact area between the rectangular sealing ring and the valve core 2 is larger, which can better adapt to the operating conditions of the refrigerant multi-way valve with higher pressure, can better adapt to the sealing of the reciprocating valve core 2, and can better resist the impact of the corners of the groove 201 on the sealing ring 3 when the valve core 2 moves, which is beneficial to further improve the sealing reliability of the valve core 2 and the valve housing 1.

[0026] In this embodiment, the inner diameter surface of the sealing ring 3 is evenly distributed along its own axial direction with multiple annular protrusions 301, specifically, there are four of them here. By providing multiple annular protrusions 301, multiple seals can be formed between the valve core 2, forming a labyrinth seal structure, which is beneficial to further improve the sealing reliability of the valve core 2 and the valve housing 1, and reduce the leakage of refrigerant in adjacent grooves 201; at the same time, it can improve fault tolerance. Even if one of the annular protrusions 301 is damaged, the remaining annular protrusions 301 can also play a sealing role, and will not cause the overall failure of the parts.

[0027] In this embodiment, the cross-section of the annular protrusion 301 is V-shaped, and the tip 301a of the annular protrusion 301 has a rounded transition; the V-shaped cross-section has good elasticity and adaptability, and the rounded transition of the tip 301a has strong wear resistance, which is particularly suitable for reciprocating sealing occasions, and is beneficial to further improve the reliability of use and reduce the risk of sealing ring failure.

[0028] In this embodiment, the transition portion between the groove 201 and the outer peripheral surface of the valve core 2 is a rounded transition structure 201a. By designing the rounded structure, the impact and scratches on the sealing ring 3 can be effectively reduced when the groove 201 passes through the sealing ring 3 during the movement of the valve core 2, especially under the premise of the rounded transition of the tip 301a of the annular protrusion 301, the friction between the valve core 2 and the sealing ring 3 is small, which is conducive to further improving the sealing effect; of course, since the rounded transition structure 201a is located on the outer peripheral surface of the valve core 2, it is easy to process.

[0029] In this embodiment, the axial width of the annular groove 102 is greater than the axial thickness of the sealing ring 3. This design is conducive to the installation of the sealing ring 3. At the same time, a certain thermal expansion gap can be reserved for the sealing ring 3, which is conducive to further ensuring the sealing reliability. During operation, the gap can be filled with refrigerant, which can play a certain buffering role on the sealing ring 3, which is conducive to further reducing the risk of damage to the sealing ring.

[0030] In this embodiment, the difference between the axial width of the annular groove 102 and the axial thickness of the sealing ring 3 is in the range of 1 mm to 4 mm. Within this range, the sealing ring 3 can be effectively limited in the axial direction, and the sealing effect is good.

[0031] In this embodiment, the sealing ring 3 is made of EPDM rubber. EPDM rubber has excellent heat resistance, water vapor resistance, and wear resistance, and is particularly suitable for refrigerant multi-way valves. It has high durability and is beneficial to further improve the durability of the overall structure.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A refrigerant multi-way valve dynamic seal structure, characterized in that: include: A valve housing (1), the valve housing (1) having a plurality of through holes (101) communicating with an inner cavity of the valve housing (1) for external piping; A valve core (2), the valve core (2) is slidably mounted in the inner cavity of a valve housing (1) in a manner that it can be driven to slide axially, a plurality of grooves (201) are arranged on the outer peripheral surface of the valve core (2) at intervals along the axial direction, and annular grooves (102) are respectively arranged on the inner cavity wall surface of the valve housing (1) corresponding to the grooves (201) at both ends of the axial direction of the valve core (2), a sealing ring (3) is arranged in the annular groove (102), and an extrusion is formed between the inner diameter surface of the sealing ring (3) and the outer peripheral surface of the valve core (2).

2. The refrigerant multi-way valve dynamic seal structure according to claim 1, characterized in that: The cross section of the sealing ring (3) is rectangular.

3. The refrigerant multi-way valve dynamic seal structure according to claim 2, characterized in that: The inner diameter surface of the sealing ring (3) is provided with a plurality of annular protrusions (301) evenly distributed along its own axial direction.

4. The refrigerant multi-way valve dynamic seal structure according to claim 3, characterized in that: The cross section of the annular protrusion (301) is V-shaped, and the tip (301a) of the annular protrusion (301) has a rounded transition.

5. The refrigerant multi-way valve dynamic seal structure according to claim 4, characterized in that: The transition portion between the groove (201) and the outer peripheral surface of the valve core (2) is a rounded transition structure (201a).

6. The refrigerant multi-way valve dynamic seal structure according to claim 2, characterized in that: The axial width of the annular groove (102) is greater than the axial thickness of the sealing ring (3).

7. The refrigerant multi-way valve dynamic seal structure according to claim 6, characterized in that: The difference between the axial width of the annular groove (102) and the axial thickness of the sealing ring (3) is in the range of 1 mm to 4 mm.

8. The refrigerant multi-way valve dynamic seal structure according to claim 1, characterized in that: The sealing ring (3) is made of EPDM rubber.

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