Expansion valve with high reliability

Abstract

The utility model provides a kind of high reliability expansion valve belongs to valve technical field.It solves the problem of lower reliability of the use of expansion valve in prior art.The high reliability expansion valve, including tubular valve body and the elastic member being arranged in valve body, valve body is further fixed with the female valve core being in barrel shape and the male valve core being slidably arranged, the end face of male valve core has the cylindrical plug-in connector, the inner wall of female valve core has the annular sealing ring, the plug-in connector of male valve core passes through sealing ring under the action of elastic member and forms the first flow passage between sealing ring, the inside of plug-in connector further has the throttling passage axially penetrating end face, first flow passage and throttling passage are respectively communicated with the both ends of valve body, plug-in connector is further provided with sealing block, when male valve core retreats and compresses elastic member, the sealing block on plug-in connector forms sealed abutment with sealing ring and blocks first flow passage.The utility model has the advantages of improving the use reliability of expansion valve.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology and relates to a highly reliable expansion valve. Background Technology

[0002] The expansion valve is an important component of the refrigeration system. It is generally installed between the condenser and the evaporator. It works with the compressor to liquefy the gas evaporated in the evaporator into a liquid refrigerant at a high temperature and high pressure. After the liquid refrigerant at a high temperature and high pressure passes through the throttling orifice of the expansion valve, it forms a low temperature and low pressure mist-like liquid refrigerant. Finally, heat exchange occurs in the evaporator, which enables the air conditioner to achieve the cooling effect.

[0003] For example, Chinese patent literature discloses a one-way self-balancing expansion valve (authorization announcement number: CN220249048U), which includes a tubular valve body, a female valve core fixed in the valve body, a male valve core slidably connected in the valve body, a limiting seat fixed in the valve body, and a spring that elastically acts between the male valve core and the limiting seat. The female valve core has a through throttling hole, and the male valve core has a plug on its end face. The plug passes through the throttling hole. The outer circumferential surface of the plug has a pressure stabilizing surface and several throttling surfaces. The inner circumferential surface of the throttling hole has an annular surface. Under the action of the spring, the annular surface and the pressure stabilizing surface are opposite to each other and form a pressure stabilizing channel. When the male valve core pushes the spring to move, the annular surface can form a throttling channel with the corresponding throttling surface.

[0004] This one-way self-balancing expansion valve still has room for improvement in its use: During use, the two ends of the expansion valve body need to be welded to the condenser and evaporator respectively. The high temperature generated during the welding process will be quickly conducted to the annular surface of the female valve core and the plug of the male valve core, causing the annular surface of the female valve core and the plug of the male valve core to expand due to heat. In addition, the distance between the annular surface and several throttling surfaces opposite it is small. After the annular surface of the female valve core and the plug expand due to heat, the plug is prone to jamming with the female valve core, thus affecting the normal use of the expansion valve and resulting in poor reliability of the existing expansion valve. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a highly reliable expansion valve. The technical problem this invention aims to solve is how to improve the reliability of the expansion valve.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A highly reliable expansion valve includes a tubular valve body and an elastic element disposed within the valve body. The valve body also contains a cylindrical female valve core and a slidably disposed male valve core. The male valve core has a columnar connector on its end face. The female valve core has an annular sealing ring on its inner wall. The connector of the male valve core passes through the sealing ring under the action of the elastic element, forming a first flow channel between the connector and the sealing ring. The connector also has an axially penetrating throttling channel inside its end face. Both the first flow channel and the throttling channel are connected to the two ends of the valve body. A sealing block is also provided on the connector. When the male valve core retracts and compresses the elastic element, the sealing block on the connector forms a seal with the sealing ring, blocking the first flow channel.

[0008] The throttling channel of this highly reliable expansion valve is located inside the male valve core connector. Even if the throttling ring and connector expand due to heat when the valve body is welded to other copper pipes, the throttling channel will not be blocked and the "throttling" will not be interrupted. In the normally open state, the refrigerant can pass through the valve body simultaneously from the first flow channel and the throttling channel, allowing a larger flow of refrigerant to pass through the valve body. In the throttling state, the sealing block and the sealing ring form a seal and block the first flow channel, so that the refrigerant can only pass through the narrow throttling channel on the connector. The throttling effect is good, thereby improving the reliability of the expansion valve.

[0009] In the aforementioned high-reliability expansion valve, the sealing block is sleeved and fixed on the plug of the male valve core. The outer peripheral wall of the sealing block has an annular sealing surface, and the sealing ring has an arc-shaped chamfered surface near the inner edge of the sealing block. During refrigeration throttling, the sealing surface and the arc-shaped chamfered surface form a sealing contact. The sealing surface is an annular plane, and the arc-shaped chamfered surface is an arc surface. When the arc surface contacts the plane, it can tolerate a certain angular deviation and lateral offset, reducing the alignment requirement, automatically compensating for misalignment, and ensuring the sealing effect between the sealing block and the sealing ring.

[0010] In the aforementioned high-reliability expansion valve, the outer peripheral wall of the connector has an annular step, the sealing block abuts against the annular step, and the inner peripheral wall of the sealing block has an annular limiting surface. The edge of the throttling channel is turned outward and abuts against the limiting surface to form a fixed structure. In use, the male valve core is first assembled into the valve body, then the sealing block is fitted onto the connector of the male valve core, and then the edge of the throttling channel is turned outward and abuts against the limiting surface to form a fixed structure, i.e., riveting. This facilitates the assembly of the male valve core into the valve body and also ensures a gapless connection between the sealing block and the male valve core, resulting in high connection rigidity and stronger overall structural integrity. During use, vibration loads are evenly distributed, stress concentration is low, fretting wear is less likely to occur, and reliability is high.

[0011] In the aforementioned high-reliability expansion valve, the male valve core has an inwardly inclined auxiliary inlet on its side wall. The interior of the male valve core has a second flow channel that simultaneously communicates with the auxiliary inlet and the throttling channel. The orifice diameter of the second flow channel is larger than that of the throttling channel. When this high-reliability expansion valve is in the normally open state, refrigerant can enter the second flow channel from the auxiliary inlet and pass through the valve body, preventing the narrow throttling channel from being insufficient to supply refrigerant.

[0012] In the aforementioned high-reliability expansion valve, the inner wall of the female valve core has an annular blocking ring. The blocking ring and the sealing block are located on opposite sides of the sealing ring, with the blocking ring adjacent to the sealing ring. The cross-section of the blocking ring is a trapezoid with its short side facing the male valve core. In the normally open state, the blocking ring guides refrigerant containing impurities to the side wall of the male valve core for backflow or direct introduction into the auxiliary inlet, preventing impurities from entering the gap between the male and female valve cores and affecting the normal movement of the male valve core.

[0013] Compared with existing technologies, the advantages of this highly reliable expansion valve are as follows: The throttling channel of this highly reliable expansion valve is opened inside the male valve core connector. Even if the female valve core and connector expand due to heat, the throttling channel will not be blocked and the "throttling" will not be interrupted. In addition, when in the throttling state, the sealing block and the sealing ring form a seal and block the first flow channel, so that the refrigerant can only pass through the narrow throttling channel on the connector, resulting in a good throttling effect and thus improving the reliability of the expansion valve. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of a highly reliable expansion valve in its normally open state.

[0015] Figure 2 This is a cross-sectional view of the highly reliable expansion valve in a refrigeration throttling state.

[0016] In the diagram, 1 is the valve body; 1a is the heating end; 1b is the cooling end; 2 is the male valve core; 2a is the connector; 2a1 is the throttling channel; 2a2 is the annular step; 2b is the second flow channel; 2c is the auxiliary inlet; 3 is the female valve core; 3a is the sealing ring; 3a1 is the arc-shaped chamfered surface; 3b is the blocking ring; 4 is the elastic element; 5 is the sealing block; 5a is the sealing surface; 5b is the limiting surface; and 6 is the first flow channel. Detailed Implementation

[0017] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0018] Example 1

[0019] A highly reliable expansion valve, reference Figure 1 and Figure 2 The valve body includes a tubular valve body 1 and an elastic element 4 disposed within the valve body 1. A cylindrical female valve core 3 and a sliding male valve core 2 are also fixed within the valve body 1. The male valve core 2 has a columnar connector 2a on its end face. The inner wall of the female valve core 3 has an annular sealing ring 3a. The connector 2a of the male valve core 2 passes through the sealing ring 3a under the action of the elastic element 4, forming a first flow passage 6 between the connector 2a and the sealing ring 3a. The connector 2a also has an axially penetrating throttling channel 2a1 extending through its end face. Both the first flow passage 6 and the throttling channel 2a1 are connected to both ends of the valve body 1. A sealing block 5 is also provided on the connector 2a. When the connector 2a of the male valve core 2 retracts and compresses the elastic element 4, the sealing block 5 on the connector 2a forms a seal against the sealing ring 3a, blocking the first flow passage 6.

[0020] Combination Figure 2 Specifically, the sealing block 5 is sleeved and fixed on the connector 2a of the male valve core 2. The outer peripheral wall of the sealing block 5 has an annular sealing surface 5a, and the sealing ring 3a has an arc-shaped chamfered surface 3a1 near the inner ring edge of the sealing block 5. In the refrigeration throttling state, the sealing surface 5a and the arc-shaped chamfered surface 3a1 can form a sealing seal. Figure 1 and Figure 2 More specifically, the outer peripheral wall of the connector 2a has an annular step 2a2, the sealing block 5 abuts against the annular step 2a2, and the inner peripheral wall of the sealing block 5 has an annular limiting surface 5b, the edge of the throttling channel 2a1 is turned outward and abuts against the limiting surface 5b to form a fixed shape.

[0021] Combination Figure 1 and Figure 2 Furthermore, the male valve core 2 has an inwardly inclined auxiliary inlet 2c on its side wall, and the interior of the male valve core 2 has a second flow channel 2b that is simultaneously connected to the auxiliary inlet 2c and the throttling channel 2a1. The diameter of the second flow channel 2b is larger than the diameter of the throttling channel 2a1.

[0022] In this embodiment, the male valve core 2 preferably has an inwardly inclined auxiliary inlet 2c on its side wall, and the interior of the male valve core 2 has a second flow channel 2b that communicates with both the auxiliary inlet 2c and the throttling channel 2a1. The width of the second flow channel 2b is greater than the width of the throttling channel 2a1. Figure 1 and Figure 2As shown, preferably, a mounting seat located on one side of the male valve core 2 is also fixed inside the valve body 1. One end of the elastic element 4 is fixed to the mounting seat, and the other end of the elastic element 4 is fixed to the male valve core 2. The mounting seat, the elastic element 4, and the male valve core 2 are coaxially arranged, so that the elastic element 4 can better push the male valve core 2 to move towards the female valve core 3 and can be better compressed by the male valve core 2.

[0023] This highly reliable expansion valve has a unidirectional interconnection structure. Specifically, when refrigerant flows into valve body 1 from heating end 1a or into valve body 1 at a small flow rate from cooling end 1b (i.e., when the refrigerant cannot yet push the male valve core 2 to compress the elastic element 4), this highly reliable expansion valve is in the following state: Figure 1 In the normally open state shown, the blocking ring 3b can guide the refrigerant containing impurities to the side wall of the male valve core 2 and then backflow or directly into the auxiliary inlet 2c, preventing impurities from entering the gap between the male valve core 2 and the female valve core 3 and affecting the normal movement of the male valve core 2. During refrigeration, the refrigerant flows into the valve body 1 in a large flow from the refrigeration end 1b and pushes the male valve core 2 to compress the elastic element 4 and move away from the female valve core 3 until the sealing block 5 on the male valve core 2 connector 2a abuts against the sealing ring 3a on the female valve core 3, and the annular sealing surface 5a on the sealing block 5 and the arc-shaped chamfered surface 3a1 on the sealing ring 3a form a sealing abutment (e.g., Figure 2 As shown), at this time, the highly reliable expansion valve is in a refrigeration throttling state, and the refrigerant can only pass through the valve body 1 through the narrow throttling channel 2a1 on the connector 2a. After refrigeration is completed, the male valve core 2 returns to its original position under the action of the elastic element 4. Figure 1 The state shown.

[0024] Example 2

[0025] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference is that the outer peripheral wall of the plug 2a has an annular step 2a2, and the sealing block 5 is threadedly connected to the plug 2a and abuts against the annular step 2a2 (not shown in the figure).

[0026] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A highly reliable expansion valve, comprising a tubular valve body (1) and an elastic element (4) disposed within the valve body (1), wherein a cylindrical female valve core (3) and a slidably disposed male valve core (2) are also fixedly disposed within the valve body (1), and the male valve core (2) has a columnar connector (2a) on its end face, characterized in that, The inner wall of the female valve core (3) has an annular sealing ring (3a). The plug (2a) of the male valve core (2) passes through the sealing ring (3a) under the action of the elastic element (4) and forms a first flow passage (6) with the sealing ring (3a). The plug (2a) also has an axially penetrating throttling channel (2a1) inside. The first flow passage (6) and the throttling channel (2a1) are respectively connected to the two ends of the valve body (1). The plug (2a) is also provided with a sealing block (5). When the male valve core (2) retracts and compresses the elastic element (4), the sealing block (5) on the plug (2a) forms a seal with the sealing ring (3a) and blocks the first flow passage (6).

2. The high-reliability expansion valve according to claim 1, characterized in that, The sealing block (5) is sleeved and fixed on the plug (2a) of the male valve core (2). The outer peripheral wall of the sealing block (5) has an annular sealing surface (5a). The sealing ring (3a) has an arc-shaped chamfered surface (3a1) near the inner ring edge of the sealing block (5). In the refrigeration throttling state, the sealing surface (5a) and the arc-shaped chamfered surface (3a1) can form a sealing abutment.

3. A highly reliable expansion valve according to claim 1 or 2, characterized in that, The outer peripheral wall of the connector (2a) has an annular step (2a2), the sealing block (5) abuts against the annular step (2a2), and the inner peripheral wall of the sealing block (5) has an annular limiting surface (5b). The edge of the throttling channel (2a1) is turned outward and abuts against the limiting surface (5b) to form a fixed connection.

4. A highly reliable expansion valve according to claim 1 or 2, characterized in that, The male valve core (2) has an inwardly inclined auxiliary inlet (2c) on its side wall. The male valve core (2) has a second flow channel (2b) that is connected to both the auxiliary inlet (2c) and the throttling channel (2a1). The diameter of the second flow channel (2b) is larger than the diameter of the throttling channel (2a1).

5. The high-reliability expansion valve according to claim 4, characterized in that, The inner wall of the female valve core (3) has an annular blocking ring (3b). The blocking ring (3b) and the sealing block (5) are located on both sides of the sealing ring (3a), and the blocking ring (3b) is arranged adjacent to the sealing ring (3a). The cross-section of the blocking ring (3b) is a trapezoid with its short side opposite to the male valve core (2).

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