KR20230170459A - Refrigerant pipe connection structure of service valve for air conditioner outdoor unit - Google Patents

Abstract

The present invention relates to a refrigerant pipe connection structure of a service valve for an outdoor unit of an air conditioner, in which an outdoor unit connection port (10) to which a valve tube (T) connected to the outdoor unit is welded and a refrigerant pipe (P) connected to the indoor unit are detachably coupled. An air conditioner equipped with an indoor unit connection port (20), a spindle port (30) into which a spindle that opens and closes the outdoor unit connection port (10) is inserted, and an air vent port (40) for refrigerant injection or air discharge from the refrigerant pipe. In the refrigerant pipe connection structure of the service valve for an outdoor unit, the indoor unit connection port (20) includes a pressurized male screw (100) formed on the outer periphery; At the inner periphery of the tip of the indoor unit connection port 20 where the pressure-fastening male screw 100 is formed, an airtight insertion groove 200 is enlarged beyond the pipe inner diameter and has a support ridge 210 on one side in communication with the pipe inner diameter; A female thread 310 is formed on the inner periphery of one side to be screwed to the pressurized male thread, and a refrigerant pipe coupling hole 320 corresponding to the diameter of the refrigerant pipe is formed at the tip of the other side, and through the refrigerant pipe coupling hole 320 A pressurized union nut (300) fitted to one side of the tip of the refrigerant pipe; The pressurized union nut 300 is coupled to the outer periphery of the refrigerant pipe so as to be seated and coupled to the inner edge formed in the refrigerant pipe coupling hole 320, and the pressurized union nut 300 is connected to the pressurized male screw 100 of the indoor unit connection port. As it is screwed together, one end is inserted into the airtight insertion groove 200, and as the pressure union nut 300 moves forward in the screw-fastening direction along the pressure fastening male screw 100, one end is inside the airtight insertion groove 200. A pressurizing block 400 that moves forward; The refrigerant pipe is inserted and coupled into the airtight insertion groove 200, and as one end of the pressurizing block 400 moves forward inside the airtight insertion groove 200, it is pressurized and compressed to form an inner periphery of the airtight insertion groove 200 and the refrigerant pipe. A refrigerant pipe of a service valve for an air conditioner outdoor unit, characterized in that it is formed by an airtight wedge means (500) that is closely attached to the outer circumference of the refrigerant pipe and is airtightly coupled to the indoor unit connection port of the refrigerant pipe and is closely adhered to the outer circumference of the refrigerant pipe to prevent the refrigerant pipe from leaving. It's about connection structure.

Description

{Refrigerant pipe connection structure of service valve for air conditioner outdoor unit}

The present invention relates to a refrigerant pipe connection structure of a service valve for an air conditioner outdoor unit. More specifically, the present invention relates to a refrigerant pipe connection structure of a service valve for an air conditioner outdoor unit, and more specifically, to improve the structure of the area where the refrigerant pipe is connected in a general service valve formed in a cross-shaped branch formed in an air conditioner outdoor unit. It allows for quick and easy connection and disconnection while effectively preventing refrigerant leaks, and simplifies the parts used to connect service valves and refrigerant pipes to reduce manufacturing costs and improve workability for easy maintenance. This relates to the refrigerant pipe connection structure of the service valve for an air conditioner outdoor unit.

Generally, the refrigeration cycle of a refrigerator includes a compressor that compresses the sucked refrigerant to high pressure and discharges it, a condenser that condenses the refrigerant discharged from the compressor by heat radiation, an expansion valve that expands the condensed refrigerant supplied from the condenser, and It includes an evaporator that turns the blown air into cold by evaporating the refrigerant supplied from the expansion valve through heat exchange with the blown air.

In the refrigeration cycle, a service valve is installed in the refrigerant pipe installed between the condenser and the expansion valve and the refrigerant pipe installed between the evaporator and the compressor to charge refrigerant or replenish insufficient refrigerant.

Meanwhile, the service valve installed on the outdoor unit side for an air conditioner includes an outdoor unit connection port to which a valve tube connected to the outdoor unit is welded, an indoor unit connection port to which a refrigerant pipe connected to the indoor unit is removably coupled, and a spindle that opens and closes the outdoor unit connection port. And, an air vent port is provided for refrigerant injection or air discharge from the refrigerant pipe.

The method of connecting the refrigerant pipe connected to the indoor unit connection port in this service valve is, first, a connection method in which the tip of the refrigerant pipe is expanded and the expanded part is compressed with a tightening nut to maintain airtightness, and second, the indoor unit A connection method is used to maintain airtightness by inserting a snap ring and an O-ring inside the connection port and fastening a tightening nut from the outside to press the O-ring.

On the other hand, the method of expanding the tip of the refrigerant pipe is a construction method in which if the tightening nut is excessively tightened, the expanded tip will be torn due to the soft nature of the copper pipe, and airtightness will not be maintained due to the torn area, resulting in loss of refrigerant gas. In addition to the above-mentioned problems, there is a problem that construction costs increase because separate equipment and skilled technicians are required.

On the other hand, the latter method of inserting the snap ring and O-ring and tightening the tightening nut from the outside does not require separate expansion work, but due to the nature of the refrigerant pipe made of copper pipe, the refrigerant pipe is inserted with the tightening nut loosened. After that, the tightening nut must be tightened. However, if the refrigerant pipe is inserted while the tightening nut is full to a certain extent, scratches will be formed on the surface of the not-hard copper pipe by the snap ring, which may cause fine refrigerant to leak through this part. There were also concerns.

In addition, since the latter tightening nut was exposed to the outside, there was a risk of refrigerant leaking even if a child or other curious person other than the air conditioner installer loosened the tightening nut slightly or accidentally, resulting in unintentional cooling. In addition to a decrease in efficiency, a situation in which re-injection of refrigerant may be necessary may occur, resulting in unnecessary waste of cost.

Furthermore, the latter method of maintaining airtightness by inserting a snap ring and an O-ring maintains the snap ring in a state of combining the copper pipe with the female thread formed on the inner periphery of the indoor unit connection port of the service valve, thereby preventing excessive leakage when replacing the copper pipe. Because the copper pipe is separated from the service valve only by using external force, the worker faces considerable difficulties during the repair process, and even if the tip of the copper pipe is damaged and only a portion of the expensive copper pipe tip is cut off and used, the process of separating it from the service valve The problem of the entire copper pipe being damaged due to excessive external force is frequent, ultimately increasing the economic burden of having to replace it with a new copper pipe.

Moreover, since only the tip of the copper pipe is connected to the service valve by a snap ring, the tip of the copper pipe expands even if the snap ring is defective or an outsider simply pulls the copper pipe, causing the problem of the pipe tip being more easily separated than the combined electronic configuration. As mentioned earlier, in the process of joining copper pipes, in addition to the difficulty in maintaining airtightness due to damage to the surface of the copper pipe by the snap ring, the O-ring is also damaged in the process of fitting the copper pipe to the service valve. Since it is easy to curl up and form a gap, there is a problem of leakage of refrigerant gas through this.

In order to improve this problem, Republic of Korea Patent No. 10-1440223, registration date: September 3, 2014. A service valve for connecting air conditioner refrigerant pipes is being developed.

The service valve is connected to the indoor unit connection port in the following order: snap ring - washer - O-ring - tightening bolt - cap, and is configured to maintain airtightness and cohesion of the refrigerant pipe. In fact, damage to the outer circumference of the copper pipe due to the snap ring is prevented. Only the tip where the snap ring is connected is damaged, and since it corresponds to the first step of the copper pipe, even if the refrigerant gas leaks, it is blocked by the O-ring at the rear end to maintain airtightness, The circular cross-section of the O-ring is irregularly transformed into an oval shape by the tightening bolt to expand the contact area, thereby enabling airtightness.

However, in the above configuration, the snap ring is still coupled to the tip of the copper pipe, so the copper pipe is frequently damaged during the process of separating the copper pipe, and the O-ring also has a limitation in being compressed by the tightening bolt, making it airtight. There is a limit to maintaining it. Furthermore, as the tightening bolt continues to advance, the O-ring becomes longer in the vertical direction and becomes narrower on the left and right, so that the actual airtight contact on the outer periphery of the copper pipe maintains a linear contact or a point contact in cross section. There is a problem that if the tightening bolt is continuously filled, the O-ring may exceed its compression limit and be damaged, resulting in loss of outflow gas.

Moreover, the O-ring is usually made of an elastic rubber material and has a circular cross-section, so when the O-ring is compressed by the actual tightening bolt, the circular shape of the O-ring bursts into an irregular shape, ultimately resulting in leakage of expensive refrigerant gas. It will happen.

Furthermore, the structure that substantially restrains the refrigerant pipe is restrained by a snap ring, so if the snap ring connection is defective, the refrigerant pipe easily falls out or a part of the refrigerant pipe falls out, and the tip of the refrigerant pipe cannot maintain airtightness within the indoor unit connection port and refrigerant In addition to the problem of gas leaking, when high pressure is applied to the refrigerant gas, the leak of refrigerant gas occurs frequently due to the separation of the refrigerant pipe bound by the snap ring, resulting in significant economic loss in maintaining this. there is.

1. Republic of Korea Patent No. 10-1440223, registration date: September 3, 2014.

Therefore, the present invention was created to solve the problems described above, and when a refrigerant pipe is connected to the indoor unit connection port of the service valve formed in the outdoor unit of an air conditioner, economic benefits are achieved through simplification of parts and ease of assembly provides expert knowledge. Anyone can assemble it without any knowledge, and even if the pressure inside the pipe increases, the refrigerant pipe does not slide or fall out from inside the service valve. Even if an external force is applied, the refrigerant pipe does not fall out, so the pipe connection between the refrigerant pipe and the service valve is stably connected. The purpose is to provide a refrigerant pipe connection structure for service valves for air conditioner outdoor units that can maintain airtightness.

In addition, the present invention is easy to disassemble and assemble when replacement or repair of the refrigerant pipe is required, so maintenance is simple, the refrigerant pipe is not damaged during the disassembly and assembly process, so it is easy to maintain the airtightness of the refrigerant pipe, and it is a reusable air conditioner outdoor unit. Another purpose is to provide a refrigerant pipe connection structure for the service valve.

The refrigerant pipe connection structure of the service valve for the outdoor unit of the air conditioner according to the present invention is the outdoor unit connection port (10) where the valve tube (T) connected to the outdoor unit is welded, and the refrigerant pipe (P) connected to the indoor unit are detachably coupled to the indoor unit. For an air conditioner outdoor unit equipped with a connection port (20), a spindle port (30) into which a spindle that opens and closes the outdoor unit connection port (10) is inserted, and an air vent port (40) for refrigerant injection or air discharge from the refrigerant pipe. In the refrigerant pipe connection structure of the service valve, the indoor unit connection port (20) includes a pressurized male screw (100) formed on the outer periphery; At the inner periphery of the tip of the indoor unit connection port 20 where the pressurized male screw 100 is formed, an airtight insertion groove 200 is enlarged beyond the pipe inner diameter and has a support ridge 210 on one side in communication with the pipe inner diameter; A female thread 310 is formed on the inner periphery of one side to be screwed to the pressurized male thread, and a refrigerant pipe coupling hole 320 corresponding to the diameter of the refrigerant pipe is formed at the tip of the other side, and through the refrigerant pipe coupling hole 320 A pressurized union nut (300) fitted to one side of the tip of the refrigerant pipe; The pressurized union nut 300 is coupled to the outer periphery of the refrigerant pipe so as to be seated and coupled to the inner edge formed in the refrigerant pipe coupling hole 320, and the pressurized union nut 300 is connected to the pressurized fastening male screw 100 of the indoor unit connection port. As it is screwed together, one end is inserted into the airtight insertion groove 200, and as the pressure union nut 300 moves forward in the screw fastening direction along the pressure fastening male screw 100, one end is inside the airtight insertion groove 200. A pressurizing block 400 that moves forward; The refrigerant pipe is inserted and coupled to the airtight insertion groove 200, and as one end of the pressurizing block 400 moves forward inside the airtight insertion groove 200, it is pressurized and compressed, and the inner periphery of the airtight insertion groove 200 and the refrigerant pipe are connected. It is characterized by being formed with an airtight wedge means (500) that is closely attached to the outer periphery and is airtightly coupled to the indoor unit connection port of the refrigerant pipe and is tightly attached to the outer periphery of the refrigerant pipe to prevent the refrigerant pipe from leaving.

Meanwhile, the pressurization block 400 is placed on the inner edge of the refrigerant pipe coupling hole 320 of the pressurization union nut 300, and is airtight when moving forward by screwing on the pressure fastening male screw 200 of the pressurization union nut 300. A resting groove 330 is formed to support and press the wedge means 500, and a locking step 340 is formed between the female screw 310 and the resting groove 330 and has a diameter smaller than the inner diameter of the female screw and larger than the resting groove; It is characterized by its formation.

Here, the pressurizing block 400 is formed in a cylindrical shape at one end and is inserted into the airtight insertion groove 200, and moves forward inside the airtight insertion groove 200 according to the forward movement of the pressurizing union nut 300 to create an airtight wedge. a pressurizing part 410 provided to correspond to the inner diameter of the airtight insertion groove 200 to pressurize the means 500; The other side, which is the opposite side of the pressurizing part 410, is placed in the seating groove 320 of the pressurizing union nut 300 and is provided to press and move along the center line of the inner diameter of the pipe without moving according to the screwing direction of the pressurizing union nut. (420) and; The diameter is enlarged between the pressurizing part 410 and the support support part 420, and is engaged with the locking step 340, and is caught on the tip of the indoor unit connection port of the service valve, so that the pressurizing part 410 is inserted into the airtight insertion groove 200. ) a stop portion 430 provided to limit forward movement within; Characterized in that a fitting hole 440 is formed through the center so that the tip of the refrigerant pipe fitted with the pressurizing union nut is fitted from the support support portion 420 to the outside of the tip of the pressurizing portion 410.

Meanwhile, the airtight wedge means 500 is inserted into the airtight insertion groove 200 and is provided with a support washer 510 and a pressure washer 520 formed in a circular ring shape so that the refrigerant pipe is inserted into the center, A ring-shaped airtight elastic pad 530 is formed between the back washer 510 and the pressure washer 520, and the back washer 510 coupled to the support ledge 210 inside the airtight insertion groove 200 is It serves as a support uniformly around the circular circumference according to the expansion deformation of the airtight elastic pad 530, and the pressure washer 520 in contact with the pressure block 400 presses the airtight elastic pad 530 with uniform pressure around the circular circumference. The airtight elastic pad 530 is located between the support washer 510 and the pressure washer 520 to form an elastic wedge portion 532 having a cross-section of a “V” shape on one side. , the angle of the elastic wedge portion 532 is formed at an angle of 45 degrees or 46 degrees to 135 degrees or less, and the pressure block 400, which moves forward according to the screwing of the pressure union nut 300, is airtightly inserted. As the pressure washer 520 inserted into the groove 200 is pressed, the support washer 510 exerts a support force in the opposite direction to the pressing direction, so that the angle of the elastic wedge portion 532 of the airtight elastic pad 530 increases. As it spreads, the contact area expands to the inner periphery of the airtight insertion groove 200 and the outer periphery of the refrigerant pipe, and is tightly coupled to form an airtight connection.

Furthermore, the outer periphery of the inner refrigerant pipe communicating with the refrigerant pipe coupling hole 320 of the pressurization union nut 300 prevents the pressurization union nut 300, which is located and coupled to one side of the refrigerant pipe front end, from falling to one side of the refrigerant pipe front end. It is preferable that a grip ring 600 coupled to is further provided.

The present invention relates to a refrigerant pipe connection structure of a service valve for an air conditioner outdoor unit. When the refrigerant pipe is connected to the indoor unit connection port of the service valve formed in the air conditioner outdoor unit, the refrigerant pipe can be connected to the service valve while maintaining airtightness. The wedge unit makes it easy to simplify and disassemble and assemble parts, and there is no damage to the outer periphery of the refrigerant pipe during the disassembly and assembly process, making reuse and maintenance of the refrigerant pipe easy. Anyone can make the same airtight pipe connection without specialized knowledge or technology. This has a possible effect.

In addition, an airtight pipe connection capable of responding to various pipe pressures is possible, and the refrigerant pipe can be used even at high pressure without the phenomenon of coming off the service valve, minimizing the outflow of refrigerant gas, eliminating the hassle of recharging due to external outflow of refrigerant gas. It has the advantage of being cost-free and economically advantageous.

Figure 1 is an overall perspective view of the refrigerant pipe connection structure of the service valve for an air conditioner outdoor unit according to the present invention.
Figure 2 is an exploded perspective view of the refrigerant pipe connection structure of the service valve for an air conditioner outdoor unit according to the present invention.
Figure 3 is a side cross-sectional view of the refrigerant pipe connection structure of the service valve for an air conditioner outdoor unit according to the present invention in an exploded state.
Figure 4 is a side cross-sectional view showing the pipe-coupled pressurized state of the refrigerant pipe connection structure of the service valve for an air conditioner outdoor unit according to the present invention.
Figure 5 is a side cross-sectional view showing the pressurized state of the refrigerant pipe connection structure of the service valve for an air conditioner outdoor unit according to the present invention after pipe connection.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and will be implemented in many different forms.

In this specification, the present embodiments are provided to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention. And the present invention is only defined by the scope of the claims. Accordingly, in some embodiments, well-known components, well-known operations and well-known techniques are not specifically described in order to avoid ambiguous interpretation of the present invention.

Like reference numerals refer to like elements throughout the specification. Also, the terms used (mentioned) in this specification are for describing embodiments and are in no way intended to limit the present invention. As used herein, singular forms also include plural forms, unless specifically stated otherwise in the context. Additionally, components and operations referred to as 'including (or, including)' do not exclude the presence or addition of one or more other components and operations.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used with meanings that can be commonly understood by those skilled in the art to which the present invention pertains. Additionally, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless they are defined.

Hereinafter, technical features according to an embodiment of the refrigerant pipe connection structure of the service valve for an air conditioner outdoor unit according to the present invention will be described in detail with reference to the attached drawings.

Figure 1 is an overall perspective view of the refrigerant pipe connection structure of the service valve for an air conditioner outdoor unit according to the present invention, Figure 2 is an exploded perspective view of the refrigerant pipe connection structure of the service valve for an air conditioner outdoor unit according to the present invention, and Figure 3 is an exploded perspective view of the refrigerant pipe connection structure of the service valve for an air conditioner outdoor unit according to the present invention. It is a side cross-sectional view of the disassembled state of the refrigerant pipe connection structure of the service valve for an air conditioner outdoor unit according to the present invention, and Figure 4 is a side cross-sectional view showing the pipe-coupled pressurized state of the refrigerant pipe connection structure of the service valve for an air conditioner outdoor unit according to the present invention. Figure 5 is a side cross-sectional view showing the pressurized state of the refrigerant pipe connection structure of the service valve for an air conditioner outdoor unit according to the present invention after pipe connection.

A typical service valve for an outdoor air conditioner unit includes an outdoor unit connection port (10) to which a valve tube (T) connected to the outdoor unit is welded, and an indoor unit connection port (20) to which a refrigerant pipe (P) connected to the indoor unit is detachably coupled. It consists of a spindle port (30) into which the spindle that opens and closes the outdoor unit connection port (10) is inserted, and an air vent port (40) for refrigerant injection or air discharge from the refrigerant pipe. Here, if the refrigerant pipe connected to the indoor unit side connected to the indoor unit connection port is not properly connected for indoor cooling, refrigerant gas leaks, which causes a problem in indoor cooling.

The cause of such refrigerant leakage may be leakage due to damage to the refrigerant pipe, but in many cases, it is caused by various problems in the airtight connection with the refrigerant pipe connected to the indoor unit connection port. That is, looking at the conventional connection structure, as previously described in the prior art, the tip of the refrigerant pipe is partially missing within the indoor unit connection port, or the refrigerant gas leaks due to damage occurring on the outer periphery when inserting the refrigerant pipe during the process of fixing it with a snap ring. This is happening. Moreover, the refrigerant pipe fixed to the tip of the refrigerant pipe by a snap ring has a problem of refrigerant leakage due to the problem of the refrigerant pipe easily falling out due to the problem that only a portion of the outer circumference of the refrigerant pipe is connected during the connection process. During the joining process, excessive pressure is applied to the outer periphery of the refrigerant pipe, which causes the part where the snap ring is connected to be easily cut or cracked, causing the refrigerant pipe to easily fall out even with a small force.

In other words, the problem as described above has been solved. The refrigerant pipe connection structure of the service valve for the outdoor unit of the air conditioner according to the present invention is configured so that the refrigerant pipe is not easily separated from the indoor unit connection port without damaging the refrigerant pipe, and is easy to disassemble and assemble. This makes it easy to replace or maintain the refrigerant pipe, and the number of parts is simplified, which not only has an economic advantage, but can also be easily applied to the indoor unit connection port of a conventional service valve, enabling universal use.

To this end, the refrigerant pipe connection structure of the service valve for the outdoor unit of the air conditioner according to the present invention is as shown in Figures 1 to 3. First, the indoor unit connection port 20 is formed with a pressure-fastening male screw 100 on the outer periphery. , an airtight insertion groove 200 is formed on the inner periphery of the tip where the pressure-fastening male screw 100 is formed, which is enlarged than the inner diameter of the pipe and has a support ridge 210 on one side in communication with the inner diameter of the pipe. Here, the airtight insertion groove is a cylinder that pressurizes the refrigerant pipe and the indoor unit connection port to make an airtight connection while the airtight wedge means is pressurized by a pressurizing block, which will be described later, and is a cylinder for transmitting pressure by the pressurizing block to the airtight wedge means without pressure loss. performs the same role as

After forming the pressure fastening male screw 100 and the airtight insertion groove 200 in the indoor unit connection port 20 as described above, as shown in FIGS. 2 and 3, a pressure union is used to connect the refrigerant pipe therein. It consists of a nut (300), a pressure block (400), and an airtight wedge means (500).

The pressurizing union nut 300 moves forward inside the airtight insertion groove when the refrigerant pipe and the indoor unit connection port 20 are connected to each other in the airtight insertion groove, and connects the refrigerant pipe from the indoor unit connection port. When the connection is to be released, the pressure block is provided to move backwards to the outside of the airtight insertion groove by the elastic force of the airtight wedge means, which will be described later. A female screw 310 is formed on the inner periphery of one side and screwed to the pressure fastening male screw, and on the other side, A refrigerant pipe coupling hole 320 corresponding to the diameter of the refrigerant pipe is formed at the tip, and the refrigerant pipe is fitted to one side of the tip of the refrigerant pipe through the refrigerant pipe coupling hole 320.

In addition, a pressure block, which will be described later, is placed on the pressure union nut 300, and is screwed and coupled to the pressure fastening sudana of the indoor unit connection port of the pressure union nut, so that the pressure block can be airtightly inserted without deviating from the axis line according to the distance it moves. A settling groove 330 is formed to enable forward movement into the groove, and a stopping step 340 in which a stop described later formed to limit further forward movement when the pressure block moves forward within the maximum airtight insertion groove is placed. This is formed.

Here, as described above, the placement groove 330 is configured so that the pressure block is located on the same axis as the airtight insertion groove so that it can be easily inserted without peripheral interference by the pressure union nut, and the refrigerant pipe coupling hole 320 ) The pressure block 400 is placed on the inner edge of the pressure union nut 300 and is configured to support and pressurize the airtight wedge means 500 when moving forward according to the screw fastening to the pressure fastening male screw 200 of the pressure union nut 300.

On the other hand, as described above, in the stopping step 340, the pressurizing block continues to enter the airtight insertion groove, causing the airtight wedge means to be excessively pressurized, causing a problem in which the outer periphery of the refrigerant pipe is deformed or the airtight wedge means is damaged. A stop portion configured to prevent the pressure from being damaged is placed between the female screw 310 formed on the inner periphery of the tip of the press union nut 300 and the seating groove 330, and has a diameter smaller than the inner diameter of the female thread and larger than the seating groove. That is, the stopping step 340 is also circular with a larger diameter than the seating groove, and its center is formed on the same axis as the airtight insertion groove.

As shown in FIGS. 4 and 5, the pressure block 400 is a piston rod that moves forward and backward along the inside of the piston cylinder if the airtight insertion groove 200 described above serves as a piston cylinder of the syringe. Performing the role, the refrigerant pipe coupling hole 320 of the pressurization union nut 300 is coupled to the outer periphery of the refrigerant pipe so as to be placed and coupled to the inner edge formed, and the pressurization union nut 300 pressurizes the indoor unit connection port. As it is screwed to the fastening male screw 100, one end is inserted into the airtight insertion groove 200, and as the pressurized union nut 300 moves forward in the screw fastening direction along the pressure fastening male screw 100, one end is inserted into the airtight insertion groove. It is configured to move forward inside the groove 200 and press the airtight wedge means, which will be described later, through the forward movement.

As shown in Figures 2 and 3, the pressing block 400 is composed of a pressing part 410, a support part 420, a stop part 430, and a fitting hole 440.

The pressing part 410 is a part corresponding to the tip of the pressing block 400 and enters the airtight insertion groove 200 to press the airtight wedge means 500, which will be described later, shown in Figures 4 and 5. As shown, one end is formed in a cylindrical shape and is inserted into the airtight insertion groove 200, and moves forward inside the airtight insertion groove 200 according to the forward movement of the pressurizing union nut 300 to pressurize the airtight wedge means 500. It is provided to correspond to the inner diameter of the airtight insertion groove 200.

The support portion 420 is formed in the same cylindrical shape as the pressing portion, is provided on the other side opposite to the pressing portion 410, and is placed in the seating groove 320 of the pressing union nut 300. It is provided to pressurize and move along the center line of the inner diameter of the pipe without moving according to the screwing direction of the pressurized union nut. In other words, the support support portion 420 is a part through which the pushing force is directly transmitted according to the direction of travel according to the screwing of the pressurized union nut, and as it is placed in the resting groove, it is positioned on the airtight insertion groove and the same axis as described above. The pressurizing part 410 can stably enter the airtight insertion groove 200 without moving to apply pressure.

The stop portion 430 has an enlarged diameter between the pressurizing portion 410 and the support portion 420, is engaged with the engaging step 340, and is caught on the tip of the indoor unit connection port of the service valve to pressurize the pressurizing portion 410. ) is provided to limit forward movement within the airtight insertion groove (200). That is, as described above, the stop unit 430 continues to enter the airtight insertion groove and the airtight wedge means is excessively pressurized, causing the problem of refrigerant gas leaking into the space created by deformation of the outer periphery of the refrigerant pipe. In addition, since the airtight wedge means is damaged and the problem of leakage of refrigerant gas also occurs, the part to prevent this and the stop part 430 are caught on the tip of the indoor unit connection port 20 and come into surface contact, thereby creating an airtight connection. It becomes stronger.

The fitting hole 440 is formed through the center so that the tip of the refrigerant pipe fitted with the press union nut is fitted from the support portion 420 to the outside of the tip of the pressurizing portion 410.

As shown in FIGS. 4 and 5, the airtight wedge means 500 is provided with the airtight insertion groove 200 so that the pressurization union nut coupled to the outer periphery of the refrigerant pipe tip and the outer periphery of the refrigerant pipe tip of the pressurizing block are fitted. It is inserted and coupled to the refrigerant pipe. The airtight wedge means 500 combined as described above is pressurized and compressed as the pressurizing portion, which is one end of the pressurizing block 400, enters the inside of the airtight insertion groove 200 and moves forward, thereby pressurizing and compressing the airtight insertion groove inner periphery and the refrigerant pipe. It is closely attached to the outer periphery and is airtightly connected to the indoor unit connection port of the refrigerant pipe and is tightly attached to the outer periphery of the refrigerant pipe to prevent the refrigerant pipe from leaving.

As described above, the gas-tight wedge means 500 is inserted into the gas-tight insertion groove 200, and the pressurization union nut 300 and the pressurization block 400 are inserted into the center of the refrigerant pipe on the outer periphery. It is provided with a support washer 510 and a pressure washer 520, which are formed in a circular ring shape so that the tip is fitted, and a ring-shaped airtight elastic pad 530 is provided between the support washer 510 and the pressure washer 520. is formed.

The support washer 510 is formed in a circular plate shape with a through hole (symbol omitted) so that a refrigerant pipe is inserted into the center, and the pressure washer 520, which will be described later, also has the same shape. The support washer 510 is coupled to the support ledge 210 inside the airtight insertion groove 200 and supports the airtight elastic pad described later, which is pressed and moved along the airtight insertion groove 200, against pressure. I will support it. In other words, the support washer 510 serves as a support evenly around the circular circumference according to the expansion deformation of the airtight elastic pad 530.

The pressure washer 520 is pressed in direct contact with the pressure portion 410 of the pressure block 400, which moves forward by the force applied by the screw tightening of the pressure union nut 300, and the pressure is airtight, which will be described later. It is formed to be applied evenly along the circumference of the elastic pad, and the pressure washer 520 in contact with the pressure block 400 presses the airtight elastic pad 530 with uniform pressure around the circular circumference to connect the indoor unit to the outer circumference of the refrigerant pipe. The airtight elastic pad adheres evenly around the inner periphery of the airtight insertion groove of the port to enable airtight connection between the refrigerant pipe and the indoor unit connection port.

As shown in FIGS. 3 to 5, the airtight elastic pad 530 is located between the support washer 510 and the pressure washer 520 and has an elastic wedge portion ( 532) is formed.

Here, the elastic wedge portion 532 expands to the outer periphery of the refrigerant pipe and the inner periphery of the airtight insertion groove as pressure is applied, and the contact area of the tip and central portion where the elastic wedge portion is expanded due to continued pressure is expanded. Adheres closely to the refrigerant pipe and airtight insertion groove. That is, as the airtight elastic pad 530 is compressed by the pressure of the pressurizing block as described above, a "V" shaped cross section is formed between the outer circumference of the elastic wedge portion 532 of the airtight elastic pad and the central side where the refrigerant pipe is fitted. As it expands, it expands and adheres tightly to the refrigerant pipe and the airtight insertion groove in an airtight state.

Additionally, with the combination, the refrigerant pipe is prevented from leaving the airtight insertion groove. This is when the refrigerant pipe is pulled out from the indoor unit connection port by external force, and when the refrigerant pipe moves outward in a ">" shape, as shown in Figures 4 and 5, the part of the elastic wedge part that contacts the refrigerant pipe The direction of the refrigerant pipe is inclined in the opposite direction to the direction of movement of the refrigerant pipe, so the refrigerant pipe does not easily come off due to the role of a wedge. However, when the pressure union nut is disconnected, the pressure is released and the configuration is restored to its original state, making it easy to remove the refrigerant pipe separately, making maintenance such as replacement easy.

The angle of the elastic wedge portion 532 as described above is formed at an angle of 45 degrees or 46 degrees to 135 degrees or less, and the pressure block 400, which moves forward according to the screwing of the pressure union nut 300, is airtight. As the pressure washer 520 inserted into the insertion groove 200 is pressed, the support washer 510 exerts a support force in the opposite direction to the pressing direction, thereby changing the angle of the elastic wedge portion 532 of the airtight elastic pad 530. As it spreads, the contact area expands to the inner periphery of the airtight insertion groove 200 and the outer periphery of the refrigerant pipe, and comes into close contact with them to form an airtight connection.

Here, if the angle of the elastic wedge is formed to be less than 45 degrees, there is a problem in that the wedge action of the elastic wedge is not properly achieved, and if the angle is formed to be greater than 135 degrees, the elastic wedge becomes a meaningless configuration. In other words, there is no significant difference from a regular O-ring.

The elastic wedge part is configured to maintain airtightness by changing the contact area and wedge action when pressed, but after the pressure is released, it returns quickly due to elastic force, and as described above, it returns more quickly, shortening maintenance time. This is possible, and by simplifying the parts, not only is it easier to work with, but virtually anyone can do it without any special skills.

In the above, the present invention has been described in detail as an embodiment, but the scope of the present invention is not limited thereto, and it is clear that many variations and modifications can be made by those skilled in the art within the scope of the technical idea, and the present invention It will be said to include the scope of substantial equivalence with the embodiment of. The technical features will be described in detail.

10: Outdoor unit connection port 20: Indoor unit connection port
30: Spindle port 40: Air vent port
T: Valve tube P: Refrigerant pipe
100: Pressure fastening male screw 200: Airtight insertion groove
210: Support jaw 300: Pressure union nut
310: female thread 320: refrigerant pipe coupling hole
330: Anchoring groove 340: Stopping step
400: Pressure block 410: Pressure unit
420: support support 430: stop part
440: Tonggong 500: Confidential wedge means
510: support washer 520: pressure washer
530: airtight elastic pad 532: elastic wedge portion

Claims (5)

An outdoor unit connection port (10) to which a valve tube (T) connected to the outdoor unit is welded, an indoor unit connection port (20) to which a refrigerant pipe (P) connected to the indoor unit is detachably coupled, and the outdoor unit connection port (10). In the refrigerant pipe connection structure of the service valve for the air conditioner outdoor unit, which has a spindle port 30 into which the opening and closing spindle is inserted, and an air vent port 40 for refrigerant injection or air discharge from the refrigerant pipe,
The indoor unit connection port 20 includes a pressurized male screw 100 formed on the outer periphery;
At the inner periphery of the tip of the indoor unit connection port 20 where the pressurized male screw 100 is formed, an airtight insertion groove 200 is enlarged beyond the pipe inner diameter and has a support ridge 210 on one side in communication with the pipe inner diameter;
A female thread 310 is formed on the inner periphery of one side to be screwed to the pressurized male thread, and a refrigerant pipe coupling hole 320 corresponding to the diameter of the refrigerant pipe is formed at the tip of the other side, and through the refrigerant pipe coupling hole 320 A pressurized union nut (300) fitted to one side of the tip of the refrigerant pipe;
The pressurized union nut 300 is coupled to the outer periphery of the refrigerant pipe so as to be seated and coupled to the inner edge formed in the refrigerant pipe coupling hole 320, and the pressurized union nut 300 is connected to the pressurized fastening male screw 100 of the indoor unit connection port. As it is screwed together, one end is inserted into the airtight insertion groove 200, and as the pressure union nut 300 moves forward in the screw fastening direction along the pressure fastening male screw 100, one end is inside the airtight insertion groove 200. A pressurizing block 400 that moves forward;
The refrigerant pipe is inserted and coupled to the airtight insertion groove 200, and as one end of the pressurizing block 400 moves forward inside the airtight insertion groove 200, it is pressurized and compressed, and the inner periphery of the airtight insertion groove 200 and the refrigerant pipe are connected. A refrigerant pipe of a service valve for an air conditioner outdoor unit, characterized in that it is formed by an airtight wedge means (500) that is closely attached to the outer circumference of the refrigerant pipe and is airtightly coupled to the indoor unit connection port of the refrigerant pipe and is closely adhered to the outer circumference of the refrigerant pipe to prevent the refrigerant pipe from leaving. Connection structure.
According to paragraph 1,
The pressurizing block 400 is placed on the inner edge of the refrigerant pipe coupling hole 320 of the pressurization union nut 300, and is used as an airtight wedge means when moving forward by screwing on the pressure fastening male screw 200 of the pressurization union nut 300. A seating groove 330 is formed to support the support to press (500),
A refrigerant pipe connection structure of a service valve for an air conditioner outdoor unit, characterized in that a stopping step 340 is formed between the female screw 310 and the placing groove 330 and has a diameter smaller than the internal diameter of the female screw and larger than the placing groove.
According to clause 2,
The pressurizing block 400 is formed in a cylindrical shape at one end and is inserted into the airtight insertion groove 200, and moves forward inside the airtight insertion groove 200 according to the forward movement of the pressurizing union nut 300 to form an airtight wedge means ( a pressurizing part 410 provided to correspond to the inner diameter of the airtight insertion groove 200 to pressurize the 500);
The other side, which is the opposite side of the pressurizing part 410, is placed in the seating groove 320 of the pressurizing union nut 300 and is provided to press and move along the center line of the inner diameter of the pipe without moving according to the screwing direction of the pressurizing union nut. (420) and;
The diameter is enlarged between the pressurizing part 410 and the support support part 420, and is engaged with the locking step 340, and is caught on the tip of the indoor unit connection port of the service valve, so that the pressurizing part 410 is inserted into the airtight insertion groove 200. ) a stop portion 430 provided to limit forward movement within;
A service valve for an air conditioner outdoor unit, characterized in that a fitting hole 440 is formed through the center so that the tip of the refrigerant pipe fitted with the pressurization union nut is fitted from the support support part 420 to the outside of the tip of the pressurizing part 410. Refrigerant pipe connection structure.
According to clause 1,
The airtight wedge means 500 is inserted into the airtight insertion groove 200 and is provided with a support washer 510 and a pressure washer 520 formed in a circular ring shape so that the refrigerant pipe is inserted into the center, and the support A ring-shaped airtight elastic pad 530 is formed between the washer 510 and the pressure washer 520,
The support washer 510 coupled to the support 210 inside the airtight insertion groove 200 serves as a support evenly around the circular circumference according to the expansion deformation of the airtight elastic pad 530, and pressurizes the block 400. The pressure washer 520 in contact with is formed to press the airtight elastic pad 530 with a uniform pressure around the circular circumference,
The airtight elastic pad 530 is located between the support washer 510 and the pressure washer 520 to form an elastic wedge portion 532 having a “V”-shaped cross section on one side,
The angle of the elastic wedge portion 532 is formed at an angle of 45 degrees or 46 degrees to 135 degrees or less, and the pressure block 400, which moves forward as the pressure union nut 300 is screwed, has an airtight insertion groove. As the pressure washer 520 inserted into (200) is pressed, the support washer 510 exerts a support force in the opposite direction to the pressing direction, so that the angle of the elastic wedge portion 532 of the airtight elastic pad 530 widens. The refrigerant pipe connection structure of the service valve for an air conditioner outdoor unit, characterized in that the contact area is expanded to the inner periphery of the airtight insertion groove (200) and the outer periphery of the refrigerant pipe and is tightly coupled to form an airtight connection.
According to clause 1,
The pressurization union nut 300, which is located and coupled to one side of the tip of the refrigerant pipe, is coupled to the outer periphery of the inner refrigerant pipe that communicates with the refrigerant pipe coupling hole 320 of the pressurization union nut 300 so that it does not fall to one side of the refrigerant pipe tip. A refrigerant pipe connection structure of a service valve for an air conditioner outdoor unit, characterized in that it is further provided with a grip ring (600).

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