JPH0314606Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a check valve that is lightweight, compact, and has a simple configuration. (Conventional technology) As an example of the recent multi-functional and versatile use of automobiles,
Some vehicles are equipped with a so-called cool box inside the vehicle, but this cool box is generally configured to cool the interior of the vehicle by being supplied with refrigerant from the cooling system of the car air conditioner, and the cool box is connected to the vehicle interior and each evaporator of the cool box. A solenoid valve or the like is installed in the refrigerant supply path so that refrigerant is alternately supplied to each evaporator, and the refrigerant that has passed through the evaporators is forced to be sent to the compressor side. In this case, the evaporator for the passenger compartment and the evaporator for the cool box generally have a much larger capacity, so there is a pressure difference in the refrigerant pressure on their outlet sides, and the former is in a higher pressure state. It is located in Therefore, when the refrigerant supply to the evaporator for the Cool Box is stopped, if a part of the refrigerant that has passed through the evaporator for the passenger compartment flows back to the evaporator side of the Cool Box, when the Cool Box is used, the refrigerant that flowed back will cause
A problem arises in that the cooling effect of the Cool Box decreases. Therefore, when the refrigerant supply to the cool box evaporator is stopped, a means is required to prevent the refrigerant that has passed through the passenger compartment evaporator from flowing backwards. A method of attaching a stop valve is used. Various proposals have been made regarding this check valve, for example, the
- In Publication No. 145770, two valve guides press-formed into a bowl shape are pinned back to back on both sides of a mandrel, and a check spring is housed in one of the valve guides to urge the mandrel toward the seat surface side. Japanese Utility Model Publication No. 60-5157 discloses a check valve in which a ball valve is seated on the valve surface of a seat disposed between the body and the end connector. has been done. (Problems to be solved by the invention) However, in the former case, for example, in the case of the former check valve, it is necessary to assemble the valve guide and the mandrel, and a check spring is also required when it is housed in the valve body. In the latter case, there is a problem that the number of parts is large, which promotes an increase in weight and reduces responsiveness to pressure fluctuations. There is a problem that it is bulky and cannot respond to slight pressure fluctuations. The present invention solves these conventional problems by simplifying the structure, making it smaller and lighter, and achieving high-speed response to pressure fluctuations, as well as ensuring reliable and stable opening/closing valve operation and improving service life. The purpose of this invention is to provide a check valve with (Means for solving the problem) Therefore, in the check valve of the present invention, a valve body made of synthetic resin can be moved between a pipe joint in which a seat surface is formed inside and a conduit connected to the joint. The valve body is provided with a valve surface that can engage with the seat surface, and a valve guide is protruded from the end surface of the valve body, and the valve guide is arranged so as to be able to come into sliding contact with the inner surface of the conduit. In the stop valve, a valve body is disposed in a non-energized state between the pipe joint and the conduit, and a plurality of valve guides are protruded at equiangular positions on a concentric circle of the end face of the valve body, and these valve guides are arranged in a non-energized state. The base of the valve guide is connected by a plate-shaped reinforcing frame extending radially from the center of the valve body, and an engaging protrusion that can engage with the end surface of the conduit is provided in the middle part of the valve guide, thereby providing a simple configuration and high-speed response. The valve is characterized by being able to operate, provide reliable and stable opening/closing valve operation, and improve its lifespan. (Example) Hereinafter, an illustrated example in which the present invention is applied to prevent backflow of refrigerant to a cool box evaporator installed in the cooling system of a car air conditioner will be described.
In Figs. 1 to 4, 1 is a first conduit for refrigerant circulation whose one end is connected to the refrigerant outflow side of a cool box evaporator (not shown), and the other end has a tubular half union 2 as a pipe joint. It is fixed by appropriate means such as brazing. half union 2
A nut 3 is attached to the helical shaft portion 2a, and a second conduit 5 for refrigerant flow is inserted into a through hole 4 formed in the head of the nut 3. This second conduit 5 communicates with the refrigerant outlet side of the compressor inserted in the cooling system and the evaporator for the passenger compartment (both not shown), and the end of the pipe inserted into the passage hole 4 A bead-shaped protrusion 6 is formed, and the opening edge of the through hole 4 is engaged with the outer surface of the protrusion 6. Further, the inner surface of the convex portion 6 engages with the shaft end of the helical shaft portion 2a, and an O-ring 7 is interposed inside these two engaging portions, and the O-ring 7 is inserted into the half union 2. Airtight or liquid tightness is achieved between the end of the second conduit 5 and the end of the helical shaft portion 2a. A tapered seat surface 9 whose diameter is reduced in the direction of the first conduit 1 is formed at the stepped portion of the stepped hole 8 formed in the half union 2, and the valve body is inserted into the stepped hole 8 opposite to this seat surface 9. 10 are accommodated.
The valve body 10 is made of a lightweight member such as synthetic resin, and has a valve mount 12 projecting from one side of a disk-shaped valve disk 11, as shown in FIGS. 2 to 4. Valve mount 12
A tapered valve surface 13 that can be seated on the seat surface 9 is formed on the peripheral surface of the distal end thereof, and an annular groove 15 that can accommodate an O-ring 14 is formed between the valve surface 13 and the valve disk 11. It is provided. On the other hand, a plurality of columnar valve guides 16 are provided concentrically on the other side of the valve disk 11, and the diameter of the locus circle inscribed in the outer peripheral surface of these valve guides 16 is approximately the same as the inner diameter of the second conduit 5. The second conduit 5 is formed so that it can be moved in and out along the inner circumferential surface of the second conduit 5 when the valve is operated. In addition, 17 in the figure
18 is an engaging protrusion protruding from the middle and high position of the outer peripheral surface of the valve guide 16, which engages with the end surface of the second conduit 5 to restrict movement of the valve body 10 ; is a reinforcing frame provided at the base of each valve guide 16. (Function) Since the check valve constructed in this way has the valve surface 13 and the valve guide 16 integrally molded, it can be used without the need for assembling work as in the past. O within 15
Since it is only necessary to attach the ring 14, it can be used quickly. The valve body 10 assembled in this way is
When installing the second conduit 1, 5, for example, the second conduit 5 is housed in the stepped hole 8 of the half union 2 with the valve surface 13 facing the first conduit 1 side, and the O-ring 7 is attached to the second conduit 5. After inserting the pipe end into the stepped hole 8, screw the nut 3 onto the screw shaft 2a and tighten it to connect the first and second conduits 1 and 5 through the half union 2 and nut 3. All you have to do is connect them, and there is no need to install a check spring like in the past. Valve body 1 accommodated in stepped hole 8 in this way
0 is forced to take various postures when piping the first and second conduits 1 and 5 to the vehicle, but even in such cases, the valve disc 11, valve mount 12,
Furthermore, since the valve guide 16 and the engaging protrusion 17 come into contact with the peripheral portion and maintain the opposing relationship between the valve surface 13 and the seat surface 9, the reliability of the valve operation, which will be described later, is maintained. 13 is the seat surface 9
Since the valve surface 13 is made of synthetic resin, both surfaces 9 and 13 will not be damaged even if they come into contact with each other. Next, cooling operation of the car air conditioner is started, and for convenience, refrigerant is first supplied to the evaporator for the cool box, then refrigerant is supplied to the evaporator for the passenger compartment, and then the supply of refrigerant to the evaporator for the passenger compartment is stopped. Then, the refrigerant introduced to the cool box evaporator via the condenser transforms from a liquid to a gas, absorbs the heat inside the refrigerator and performs a predetermined endothermic action, and then flows from the first conduit 1 to the first conduit 1. 2 to the conduit 5. Since such a refrigerant flow path acts in the forward direction with respect to the valve body 10 , the lightweight valve body 10 is swept away by the refrigerant and flows into the second conduit 5.
move to the side and form its open state. In this case, the refrigerant flowing into the stepped hole 8 from the first conduit 1 is divided into equal parts and rectified by the reinforcing wall 18, and the valve body 10 moves in this refrigerant flow, so that the body 10 is stabilized. and move. At this time, the refrigerant exerts pressure on the reinforcement chamber 18, and the wall 18 functions like an impeller to urge the valve body 10 to rotate. In this case, the above function is further enhanced by disposing the valve guide 16 on the outer periphery of the end face of the valve body 10 and increasing the pressure receiving area of the reinforcing frame 18 that connects them. As a result, the valve body 10 moves straight and rotates while being guided by the valve guide 16, thereby preventing the valve guide 16 from being anchored to the inner surface of the second conduit 5. In this way, when the valve body 10 has moved approximately half the distance between the seat surface 9 and the tube end of the second conduit 5, the engagement protrusion 17 comes into contact with the tube end of the second conduit 5 and stops moving. Therefore, compared to conventional valve bodies that directly contact the valve body, the travel distance is halved, and the impact at the time of contact is reduced, and compared to those that apply fluid pressure and elasticity such as a spring to the valve body. Therefore, the contact force is reduced, and since this impact force is dispersed to the three engaging protrusions 17 and its strength is reinforced by the reinforcing wall 18, the engaging protrusions 17 are not damaged by the above contact. or valve guide 1
6 will not break and the life will be improved accordingly. On the other hand, a solenoid valve (not shown) is activated to switch the refrigerant supply flow path, supplying the refrigerant to the evaporator for the passenger compartment, and stopping the supply of refrigerant to the evaporator for the cool box. After the refrigerant absorbs heat from the casing and performs a predetermined endothermic action, it is led to the compressor side through the outflow side pipe. At that time, a part of the refrigerant may flow back from the outflow side pipe into the second conduit 5 communicating with the flow path. In such a case, since the valve body 10 is lightweight, it is swept away by the above-mentioned reverse flow and quickly moves toward the first conduit 1 side. After the valve body 10 moves inward, the valve surface 13 comes into contact with the seat surface 9 and the movement is stopped. However, since the end surface of the valve disk 11 receives back pressure from the reverse flow, the valve surface 13 The engagement state between the seat surface 9 and the seat surface 9 becomes tight, forming a closed state. in this case,
During the movement of the valve body 10 , the reinforcing wall 18
The pressure of the refrigerant is applied equally to the end space partitioned by, stabilizing the movement of the refrigerant, and the reinforcing wall 18 functions like an impeller in the same way as when the valve is opened.
To encourage rotation of the valve body 10 . Therefore, the valve guide 16 moves smoothly without being moored to the inner surface of the second conduit 5, and when the valve surface 13 and the seat surface 9 come into contact,
As the valve body 10 rotates, both surfaces 13 and 9 slide against each other, promoting uniform engagement, thereby creating a reliable and stable valve closed state. Therefore, the course of reverse flow within the second conduit 5 is blocked, and leakage of the refrigerant from the second conduit 5 to the first conduit 1 is prevented, so that the refrigerant flows into the cool box evaporator communicating with the first conduit 1. This prevents the backflow from entering the cooling box, and prevents the cooling effect of the cool box from decreasing due to the backflow.
Note that when the valve body 10 is closed, the O-ring 14 attached to the body 10 contacts the valve surface 13.
Since the valve is sealed between the valve and the seat surface 9 to further strengthen the valve closed state, the valve is closed with certainty and high reliability. Moreover,
The valve body 10 is made of lightweight synthetic resin,
Even with the slight dynamic pressure of the reverse flow, the valve can be quickly reacted to form a closed state, resulting in high-speed response. (Effect of the invention) As described above, the check valve of the present invention has the valve body disposed between the pipe joint and the conduit in a non-energized state, so it does not require a biasing means such as a spring as in the past. In comparison, the configuration can be simplified. In addition, in this invention, a plurality of valve guides are protruded from concentric circles on the end face of the valve body at equiangular positions, and the bases of these valve guides are connected by a plate-shaped reinforcing frame that extends radially from the center of the valve body. Since, the valve body has become lighter,
Since it is possible to quickly respond to fluid pressure fluctuations and to uniformly apply the pressure of the moving fluid to the end face space of the valve body, the movement of the valve body can be stabilized. Moreover, by placing the above-mentioned reinforcing frame in the moving fluid, it functions like an impeller, and this function is enhanced due to the position of the valve guide, promoting rotation of the valve body. prevents the situation from being moored to the inner surface of the pipe,
In addition to moving the valve body smoothly, the valve surface and seat surface slide against each other when the valve is closed.
This has the effect of promoting uniform engagement and achieving a reliable and stable valve closing state. In addition, in the present invention, an engaging protrusion that can engage with the end surface of the conduit is provided in the middle part of the valve guide, so the moving distance is reduced compared to the conventional valve body that directly contacts the conduit. However, the impact at the time of contact can be alleviated, and the impact at the time of contact can be alleviated compared to a valve body in which fluid pressure and elasticity by a biasing means such as a spring are applied. Moreover, in the present invention, the above-mentioned impact force is distributed to a plurality of engagement protrusions, and the strength thereof is further reinforced by the reinforcing wall as described above, so that the engagement protrusions are not damaged due to the above-mentioned contact. This prevents the valve guide from breaking, and therefore has the practical effect of extending the life of this type of check valve.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of the usage state of the present invention, Fig. 2 is a perspective view showing an embodiment of the invention, Fig. 3 is a front view of Fig. 2, and Fig. 4 is a view of Fig. 2. FIG. 10 ... Valve body, 13... Valve surface, 1
6...Valve guide.

Claims (1)

[Scope of utility model registration request] A valve body made of synthetic resin is movably disposed between a pipe joint that has a seat surface formed therein and a conduit connected to the joint, and a valve surface that can engage with the seat surface is formed on the valve body. With,
A check valve having a valve guide protruding from an end face of the valve body and arranged so as to be able to slide on the inner surface of the conduit, wherein the valve body is disposed in a non-energized state between the pipe joint and the conduit, A plurality of valve guides are protruded from concentric circles on the end face of the valve body at equiangular positions, and the bases of these valve guides are connected by a plate-shaped reinforcing frame extending radially from the center of the valve body. A check valve characterized in that an engaging protrusion capable of engaging with an end surface of the conduit is provided in an intermediate portion of the check valve.