A device with bidirectional double variable throttling

Abstract

A device with bidirectional double variable throttling is composed of valve pipe, valve seat, valve core, screw, filter screen, valve core bearing pipe, big spring, valve needle seat, small spring and valve needle. The valve seat is cylindrical in shape, the outer diameter of which is consistent with the inner diameter of the valve pipe, the valve seat is consolidated with the valve pipe, the outer diameter is provided with positioning pressure groove consolidated with the valve pipe, the center of the valve seat is provided with a round hole matched with the valve core, the valve core is freely movable in the valve seat, a number of flow grooves are radially arranged at the hole wall of the valve seat, the flow grooves are single-side sealed head, the physical length thereof should satisfy the on-off of the left and right refrigerants with the change of the valve core stroke, when the valve core of the high-pressure end moves to the flow groove liquid inlet conducting position, the valve core of the low-pressure end enters the flow groove closed position, the high-pressure end refrigerant flows from the valve core bearing pipe to the low-pressure end through the flow hole, and pushes the valve needle seat to move forward, and then opens the valve needle cone head, the refrigerant is output through the liquid outlet flow hole, and the same is true when the system is reversed. The device also has the characteristics of reliable structure, simple process, low production cost and the like.

Description

Technical Field

[0001] This utility model relates to a device with bidirectional dual variable throttling in the field of air conditioning technology. Background Technology

[0002] Existing bidirectional throttling valves come in a wide variety of types, typically employing two throttling valve assemblies connected in parallel or series to achieve bidirectional refrigerant flow while regulating refrigerant flow. However, these types of bidirectional throttling valves are often large in size, require more materials, have complex manufacturing processes, and are costly to produce. There are also bidirectional throttling valves with a single valve-pipe integrated structure, which, while possessing the ability to switch refrigerant flow in both directions, often cannot meet the requirement of achieving a wide range of bidirectional refrigerant flow regulation. Summary of the Invention

[0003] This utility model provides a device with bidirectional dual variable throttling. The design involves constructing a variable throttling one-way channel opposite to the original flow direction within the body of the one-way valve core. Two essentially identical variable throttling one-way channels are combined in reverse to create a throttling valve device with mutually restrictive forward and reverse flow functions. This utility model also has advantages such as small size, simple structure, ease of processing, and low manufacturing cost.

[0004] This invention is implemented as follows: it consists of a valve tube, valve seat, valve core, screw, filter screen, valve core receiving tube, large spring, valve needle seat, small spring, and valve needle. The valve tube is a circular tube and serves as the housing of this invention; the valve tube is made of metal. The valve seat can be made of metal or high-strength nylon, and is cylindrical in shape. Its outer diameter matches the inner diameter of the valve tube, and the valve seat is fixed to the valve tube. A positioning groove is provided on the outer diameter to be fixed to the valve tube. A circular hole matching the valve core is located at the center of the valve seat, allowing the valve core to move freely within the valve seat. Several flow grooves are radially arranged on the valve seat hole wall, each with a single-sided end cap. The length of these flow grooves should accommodate the change in valve core stroke to control the flow of refrigerant. Specifically, when the high-pressure end valve core moves to the liquid inlet position of the flow groove, the low-pressure end valve core enters the closed position of the flow groove. The high-pressure end refrigerant flows through the flow hole from the valve core receiving tube to the low-pressure end, pushing the valve needle seat forward and opening the valve needle cone. The refrigerant is then output through the liquid outlet flow hole. The same applies when the system reverses direction. This interlocking function is a reliable guarantee for achieving bidirectional, dual-variable conduction. The valve core is made of metal and is cylindrical in shape. The outer diameter of the cylinder is dynamically fitted to the central hole of the valve seat. The cylinder has stepped holes inside for installing the valve needle seat, valve needle, large spring, and small spring. The bottom of the cylinder has a tapered hole that meshes with the tapered surface of the valve needle tip. The outer diameter of the cylinder opening is firmly connected to the inner diameter of the valve core receiving tube. The valve core receiving tube is a metal cylindrical tube with a positioning shaft in its inner hole. The inner diameters at both ends of the shaft are fixedly fitted to the outer diameter of the valve core. The fixing method is not limited to interference fit, adhesive bonding, welding, or screw fastening. Several flow holes are provided in the middle section of the valve core receiving tube. The valve needle seat is made of metal and is cylindrical in shape. An outwardly stepped section is provided at the open end. The outer circumference of the outwardly stepped section is clearance-fitted to the valve core hole. The cylinder body and the outwardly stepped section can move freely in the corresponding installation position of the valve core. A threaded hole matching the valve needle thread is provided at the center of the bottom end of the cylinder, and several refrigerant outlet flow holes are provided around the axis. The small spring is installed on the outer periphery of the valve needle seat cylinder, with one end abutting against the outward-facing step and the other end abutting against the valve core. Its function is to resist and balance the pressure at the refrigerant input end and provide reset kinetic energy for the valve needle at the output end. The large spring is located between the two valve needle seats, which can mitigate the fluctuation caused by sudden changes in refrigerant pressure, ensuring relatively stable system operation. The filter screen is bowl-shaped or spherical, made of metal, and fixed to the valve seat. The valve needle is made of metal and is a rod-shaped component with an inverted cone at one end and an external thread at the other end. The cone angle of the inverted cone matches the cone angle of the cone hole at the bottom of the valve core cylinder, and the external thread matches the threaded hole of the valve needle seat.

[0005] This utility model can be arranged in a fully symmetrical layout or mixed with other types of valve cores. If a fully symmetrical layout is adopted, valve seats, valve cores, filters, valve needle seats, small springs, and valve needles with identical structures can be mirrored and combined. This can reduce the number of parts, simplify the production process, and reduce production costs.

[0006] Assembly: First, fix a valve seat inside the valve tube. Then, put the small spring on the valve needle seat and install the valve core. Next, install the valve needle through the conical end of the valve core and screw the valve needle thread into the valve needle seat screw hole. Finally, fix the valve core with the large diameter end reaching the positioning shaft in the valve core receiving tube hole. This embodiment uses screw fixing, but is not limited to screw fixing. Then, install the above assembly into the valve seat in the valve tube, and then install the large spring. With the valve core receiving tube as the center, mirror the same components as the previous assembly as required. Then, snap the other valve seat into the valve tube and fix it. After the above steps are completed, the testing and debugging process can begin. Apply a small amount of slow-curing agent or slow gel to the valve needle thread. Correct the test data at the testing station, and comprehensively fine-tune the distance between the valve needle and the valve needle seat thread and the strength of the small spring preload. After the data meets the standard, remove it from the testing station and wait for the colloid to cure.

[0007] Mechanism of Operation: In an air conditioning system, the high-pressure and low-pressure ends of the refrigerant are constantly switching. When the high-pressure refrigerant pushes open the valve core to the valve seat's flow groove, the two valve cores in this invention are rigidly connected via a valve core receiving pipe, meaning their movements are synchronized. The design requires that when the flow groove on the input valve seat is open, the flow groove on the output valve seat should be closed. If the output flow groove is not completely closed, some refrigerant will flow out of the valve seat without passing through the valve needle hole, inevitably affecting the control of throttling accuracy. Therefore, in principle, when one channel is opened, the other channel should be closed. The arrow illustrates the path of the refrigerant flowing from high pressure to low pressure. When the input valve core moves to the maximum flow position in the valve seat's flow groove, the valve core receiving pipe end face will act as a limit stop when it reaches the output valve seat. The refrigerant reaches the inner cavity of the valve core receiving tube through the flow hole. Under the action of refrigerant pressure, the valve needle seat at the output end moves forward, thereby pushing open the valve needle cone. The refrigerant then flows out through the valve core cone hole. The amount of refrigerant flowing out is related to the pressure of the small spring resisting the refrigerant and the size of the valve needle opening stroke. Attached Figure Description

[0008] Figure 1 The overall structure and principle diagram of this utility model.

[0009] Figure 2 Axial sectional view of the valve seat.

[0010] Figure 3 for Figure 2 Left view.

[0011] Figure 4 for Figure 2 Sectional view of section AA.

[0012] Figure 5 This is a schematic diagram of the valve core structure.

[0013] Figure 6 This is a schematic diagram of the valve needle seat structure.

[0014] Figure 7 This is a schematic diagram of the valve core support pipe.

[0015] Figure 8 This is a schematic diagram of the valve needle structure.

[0016] β – The cone angle of the valve core cone hole and the valve needle cone.

[0017] In the diagram: 1. Valve tube; 2. Valve seat; 3. Valve core; 4. Screw; 4-1. Screw fitting hole; 5. Filter screen; 6. Valve core receiving tube; 7. Large spring; 8. Valve needle seat; 9. Small spring; 10. Valve needle; 01. Liquid outlet flow hole; 02. Flow hole; 03. Positioning groove; 04. Flow groove. Detailed Implementation

[0018] A device with bidirectional dual variable throttling is composed of a valve tube 1, a valve seat 2, a valve core 3, a screw 4, a filter screen 5, a valve core receiving tube 6, a large spring 7, a valve needle seat 8, a small spring 9, and a valve needle 10; the valve tube 1 is a circular tube and serves as the housing of this utility model, and the valve tube 1 is made of metal material. The valve seat 2 can be made of metal or high-strength nylon material, and is cylindrical in shape. Its outer diameter matches the inner diameter of the valve pipe 1. The valve seat 2 is fixed to the valve pipe 1, and a positioning groove 03 is provided on its outer diameter to be fixed to the valve pipe 1. The center of the valve seat 2 has a circular hole that matches the valve core 3. The valve core 3 can move freely in the valve seat 2. Several flow grooves 04 are radially arranged on the wall of the valve seat 2 hole. The flow grooves 04 are single-sided sealed, and their physical length should meet the requirements of the flow of the refrigerant on the left and right sides due to the change of the stroke of the valve core 3. That is, when the high-pressure end valve core 3 moves to the liquid inlet position of the flow groove 04, the low-pressure end valve core 3 enters the closed position of the flow groove 04. The high-pressure end refrigerant flows from the valve core receiving pipe 6 through the flow hole 02 to the low-pressure end, and pushes the valve needle seat 8 forward, thereby opening the cone of the valve needle 10. The refrigerant is output through the liquid outlet flow hole 01. The same applies when the system reverses direction. The interlocking function set here is a reliable guarantee for the realization of bidirectional dual variable conduction. The valve core 3 is made of metal and is cylindrical in shape. The outer diameter of the cylinder is dynamically fitted to the central hole of the valve seat 2. The cylinder has stepped holes inside for installing the valve needle seat 8, valve needle 10, large spring 7, and small spring 9. The bottom of the cylinder has a tapered hole that meshes with the tapered surface of the valve needle 10. The outer diameter of the cylinder opening is firmly connected to the inner diameter of the valve core receiving tube 6. The valve core receiving tube 6 is a metal cylindrical tube with a positioning shaft in its inner hole. The inner diameters at both ends of the shaft are fixedly fitted to the outer diameter of the valve core 3. The fixing method is not limited to interference fit, adhesive bonding, welding, or screw fastening. Several flow holes 02 are provided in the middle section of the valve core receiving tube 6. The valve needle seat 8 is made of metal and is cylindrical in shape. An outwardly stepped end is provided at the opening. The outer circumference of the outwardly stepped end is clearance-fitted to the hole in the valve core 3. The cylinder body and the outwardly stepped end can move freely at the corresponding installation position of the valve core 3. A threaded hole matching the thread of the valve needle 10 is provided at the center of the bottom of the cylinder, and several refrigerant outlet flow holes 01 are provided around the axis. The small spring 9 is installed on the outer periphery of the valve needle seat 8, with one end abutting against the outward-facing step and the other end abutting against the valve core 3. Its function is to resist and balance the pressure at the refrigerant input end and provide reset kinetic energy for the valve needle 10 at the output end. The large spring 7 is located between the two valve needle seats 8, which can alleviate the fluctuation caused by sudden changes in refrigerant pressure and ensure relatively stable system operation. The filter screen 5 is bowl-shaped or spherical, made of metal, and fixed to the valve seat 2. The valve needle 10 is made of metal and is a rod-shaped component with an inverted cone head at one end and an external thread at the other end. The cone angle β of the inverted cone head matches the cone angle β of the cone hole at the bottom of the valve core 3, and the external thread matches the threaded hole of the valve needle seat 8.

[0019] This utility model can be arranged in a fully symmetrical layout or mixed with other types of valve cores 3. If a fully symmetrical layout is adopted, valve seat 2, valve core 3, filter screen 4, valve needle seat 8, small spring 9, and valve needle 10 with identical structures can be mirrored and combined. This can reduce the number of parts, simplify the production process and reduce production costs.

[0020] Assembly: First, fix a valve seat 2 inside the valve tube 1. Then, put the small spring 9 on the valve needle seat 8 and install the valve core 3. Next, install the valve needle 10 from the tapered end of the valve core 3. Screw the valve needle 10 into the threaded hole of the valve needle seat 8. Then, fix the valve core 3 with the large diameter end reaching the positioning shaft in the valve core receiving tube 6. In this embodiment, screws 4 are used for fixing, but it is not limited to the method of fixing with screws 4. Then, install the above-mentioned assembly into the valve seat 2 in the valve tube 1, and then install the large spring 7. With the valve core receiving tube 6 as the center, mirror the same components as the previous assembly as required. Then, snap the other valve seat 2 into the valve tube 1 and fix it. After the above steps are completed, the testing and debugging process can be entered. After applying a small amount of slow curing agent or slow gel to the thread of the valve needle 10, correct the test data at the test station. Adjust the distance between the threads of the valve needle 10 and the valve needle seat 8 and the strength of the preload of the small spring 9. After the data meets the standard, remove it from the test station and wait for the colloid to cure.

[0021] Mechanism of Operation: In an air conditioning system, the high-pressure and low-pressure ends of the refrigerant are constantly switching. When the high-pressure refrigerant pushes open the valve core 3 to the flow groove 04 of the valve seat 2, the two valve cores 3 in this invention are rigidly connected by the valve core receiving pipe 6, meaning their movements are synchronized. The design requires that when the flow groove 04 of the input valve seat 2 is open, the flow groove 04 of the output valve seat 2 should be in a closed position. If the output flow groove 04 is not completely closed, some refrigerant will flow out of the valve seat 2 without passing through the valve needle 10 orifice, which will inevitably affect the control of throttling accuracy. Therefore, in principle, when one end of the channel is opened, the other end should be closed. The arrow represents the path of the refrigerant flowing from high pressure to low pressure. When the input valve core 3 moves to the maximum flow position in the flow groove 04 of the valve seat 2, the end face of the valve core receiving pipe 6 will act as a limit stop when it reaches the output valve seat 2. The refrigerant reaches the inner cavity of the valve core receiving pipe 6 through the flow hole. The valve needle seat 8 at the output end moves forward under the action of refrigerant pressure, thereby pushing open the cone of the valve needle 10. The refrigerant then flows out through the cone hole of the valve core 3. The amount of refrigerant flowing out is related to the pressure of the small spring 9 resisting the refrigerant and the size of the stroke of the valve needle 10.

Claims

1. A device with bidirectional dual variable throttling, characterized in that: It consists of a valve tube, valve seat, valve core, filter screen, valve core receiving tube, large spring, valve needle seat, small spring, and valve needle. The valve tube is circular and made of metal. The valve seat is cylindrical with an outer diameter matching the inner diameter of the valve tube. The valve seat is fixed to the valve tube, and a positioning groove is provided on the outer diameter to be fixed to the valve tube. A circular hole matching the valve core is provided in the center of the valve seat, allowing the valve core to move freely within the valve seat. Several flow grooves are radially arranged on the wall of the valve seat hole. Each flow groove is sealed on one side, and its length should be sufficient to allow for the flow of refrigerant on the left and right sides as the valve core stroke changes. That is, when the high-pressure valve core moves to the liquid inlet position of the flow groove, the low-pressure valve core enters the closed position of the flow groove. The high-pressure refrigerant flows from the valve core receiving tube to the low-pressure end through the flow hole, pushing the valve needle seat forward and opening the valve needle cone. The refrigerant is then output through the liquid outlet flow hole. The same applies when the system reverses direction.

2. The device with bidirectional dual variable throttling according to claim 1, characterized in that: The valve core is made of metal and is cylindrical in shape. The outer diameter of the cylinder is dynamically matched with the center hole of the valve seat. The cylinder has stepped holes for installing the valve needle seat, valve needle, large spring and small spring. The bottom of the cylinder has a conical hole that meshes with the conical surface of the valve needle cone. The outer diameter of the cylinder opening is firmly connected with the inner diameter of the valve core receiving tube.

3. The device with bidirectional dual variable throttling according to claim 1, characterized in that: The valve core support tube is a metal round tube with a positioning shaft in the inner hole. The inner diameters at both ends of the shaft are fixedly matched with the outer diameter of the valve core. The fixing method is not limited to interference fit, bonding, welding, or screws. The middle section of the valve core support tube is provided with several flow holes.

4. The device with bidirectional dual variable throttling according to claim 1, characterized in that: The valve needle seat is made of metal and has a cylindrical shape. The open end is provided with an outward step, and the outer circumference of the outward step is in clearance fit with the valve core hole. The cylinder body and the outward step can move freely in the corresponding installation position of the valve core. The bottom end of the cylinder is provided with a threaded hole that matches the valve needle thread, and several refrigerant outlet holes are provided around the axis.

5. The device with bidirectional dual variable throttling according to claim 1, characterized in that: The small spring is installed on the outer periphery of the valve needle seat, with one end abutting against the outward-facing step and the other end abutting against the valve core. Its function is to resist and balance the pressure at the refrigerant input end and to provide reset kinetic energy for the valve needle at the output end.

6. The device with bidirectional dual variable throttling according to claim 1, characterized in that: The valve needle is made of metal and has the shape of a rod-shaped component with an inverted cone head at one end and an external thread at the other end. The cone angle β of the inverted cone head matches the cone angle of the cone hole at the bottom of the valve core cylinder, and the external thread matches the screw hole of the valve needle seat.

7. The device with bidirectional dual variable throttling according to claim 1, characterized in that: The valve seat may be made of metal or high-strength nylon material.

Images