Simple two-way variable throttling device

Abstract

A simple two-way variable throttling device is composed of valve pipe, valve seat, valve core, big spring, filter screen, limit seat, valve needle seat, small spring and valve needle. The device is composed of two one-way channels which are interlocked. When the high-pressure end refrigerant drives the valve core to move forward to the valve seat overflow groove area, the refrigerant flows through the overflow groove, the limit seat overflow hole, the low-pressure end valve core, the valve needle seat and the valve needle to flow out from the cone head. The limit seat is used to limit the maximum stroke of the input end valve core, and the valve core stop shoulder is used to limit the stroke of the output state of the valve core. The output end valve needle seat moves forward under the refrigerant pressure, and then pushes away the valve needle cone head. The amount of refrigerant flowing out will depend on the pressure of the refrigerant and the size of the stroke of the valve needle. The device can mirror the combination of the valve seat, valve core, filter screen, valve needle seat, spring, valve needle parts with the same structure around the limit seat, which can reduce the number of part varieties, simplify the production process and reduce the production cost.

Description

Technical Field

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

[0002] Existing bidirectional throttling valves typically employ two throttling valve assemblies connected in parallel or series to achieve bidirectional refrigerant flow while regulating refrigerant flow. This type of bidirectional throttling valve suffers from drawbacks such as large size, high material consumption, and high manufacturing costs. With increasing innovation and technological advancements, bidirectional throttling valves with integrated single-valve-pipe designs are emerging. Reform and innovation to serve society have become a driving force for modern progress, and there is a strong expectation for mature, reliable, and cost-effective products to become available. Summary of the Invention

[0003] This utility model provides a simple bidirectional variable throttling device. 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, a valve seat, a valve core, a large spring, a filter screen, a limit seat, a valve needle seat, a small spring, and a 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 material, and is cylindrical in shape. Its outer diameter matches 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. The valve core can move freely in the valve seat. Several flow grooves are radially provided on the wall of the valve seat hole. The flow groove is sealed on one side. Its physical length should meet the requirements of the valve core stroke to change the flow of refrigerant. 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 valve core reaches the limit seat at its maximum stroke. The high-pressure refrigerant passes through the flow groove of the valve seat, through the flow hole of the limit seat, and pushes the low-pressure valve needle seat forward. The refrigerant flows out from the valve core cone hole through the liquid outlet of the valve needle seat. The same applies when the system reverses direction. The interlocking function set here is a reliable guarantee for the realization of bidirectional variable conduction. The limiting seat is made of metal or nylon and is annular in shape. Its outer diameter transitions with the inner diameter of the valve tube. A fixing groove is provided on the outer diameter. During installation, the valve tube is positioned and fixed to the limiting seat by riveting at the corresponding position of the fixing groove on the outer circumference of the valve tube. A through hole is provided in the middle, penetrating both valve needle seats. Several refrigerant flow holes are provided in the annulus between the central hole and the outer diameter. The valve core is cylindrical in shape and made of metal. The opening of the cylinder has a flanged shoulder for stroke limiting. The inside of the cylinder has a stepped hole for installing the large spring, valve needle seat, small spring, and valve needle. The bottom of the cylinder has a conical hole that meshes with the conical surface of the valve needle cone. The valve needle seat is made of metal and is cylindrical in shape. The opening end has an outward-curved step. The outer circumference of the outward-curved step is clearance-fitted with the valve core hole. The cylinder body and the outward-curved step 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 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 symmetrically or mixed with valve cores of other structural types. When the arrangement is symmetrical, valve seats, valve cores, filter screens, valve needle seats, small springs, valve needles and other parts with identical structures can be mirrored and combined with the limit seat as the midpoint. This can reduce the number of parts, simplify the production process and reduce production costs.

[0006] Assembly: Install the limiting seat at the designated position on the valve tube and rivet it in place. Then, install the valve core into the valve seat. Next, fit a small spring around the outer circumference of the valve needle seat and install the valve core. Then, install the valve needle through the conical end of the valve core and screw it into the threaded hole of the valve needle seat using the screwdriver groove at the end of the valve needle. Pre-install another identical assembly using the same method. Then, install the two pre-installed assemblies into the two ends of the limiting seat inside the valve tube. During installation, a large spring should be inserted between the two valve cores, pressing against the valve needle seat. Finally, fix the two valve seats in the designated position and rivet them in place. 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, comprehensively fine-tuning the distance between the valve needle and the valve needle seat thread and the strength of the small spring preload. Once the data meets the standards, remove the assembly from the testing station and wait for the adhesive 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 flow groove of the valve seat, the high-pressure refrigerant forces the low-pressure valve core to move forward. As the flow and pressure of the high-pressure refrigerant increase, the flange of the low-pressure valve core then contacts the valve seat, blocking the flow groove. The high-pressure refrigerant continues to push the output valve needle seat and valve needle forward. Although this structure does not achieve perfect synchronization between the opening and closing of the two valve cores, the large spring can automatically coordinate and buffer pressure fluctuations between the two valve cores and valve needles. The device can meet the basic requirements of bidirectional variable throttling in the system. The arrows show a schematic diagram of the refrigerant flow path. The amount of refrigerant flowing out depends on the refrigerant pressure and the stroke of the valve needle. 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 limiting seat.

[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. Large spring; 5. Filter screen; 6. Limit seat; 7. Valve needle seat; 8. Small spring; 9. Valve needle; 01. Liquid outlet orifice; 02. Flow orifice; 03. Positioning groove; 04. Flow groove. Detailed Implementation

[0018] A simple bidirectional variable throttling device comprises a valve tube 1, a valve seat 2, a valve core 3, a large spring 4, a filter screen 5, a limiting seat 6, a valve needle seat 7, a small spring 8, and a valve needle 9. The valve tube 1 is a circular tube, serving as the housing of this invention, and is made of metal. The valve seat 2 can be made of metal or high-strength nylon, and is cylindrical in shape, with its outer diameter matching the inner diameter of the valve tube 1. The valve seat 2 is fixed to the valve tube 1, and its outer diameter has a positioning groove 03 fixed to the valve tube 1. The center of the valve seat 2 has a circular hole matching the valve core 3, allowing the valve core 3 to move freely within the valve seat 2. Several flow grooves 04 are radially arranged on the wall of the valve seat 2 hole. Each flow groove 04 has a single-sided end cap, and its length should satisfy the flow of refrigerant on the left and right sides as the valve core 3's stroke changes, i.e., the high-pressure end valve core. When valve core 3 moves to the liquid inlet position of the flow groove 04, the low-pressure valve core 3 enters the closed position of the flow groove 04. The high-pressure valve core 3 reaches its maximum stroke from the limit seat 6. The high-pressure refrigerant passes through the flow groove 04 of the valve seat 2 and the flow hole 02 of the limit seat 6, pushing the low-pressure valve needle seat 7 forward. The refrigerant flows out from the cone hole of the valve core 3 through the liquid outlet flow hole 01 of the valve needle seat 7. The same applies when the system reverses direction. The interlocking function set here is a reliable guarantee for the bidirectional variable conduction. The limit seat 6 is made of metal or nylon material and is circular in shape. The outer diameter transitions with the inner diameter of the valve tube 1. The outer diameter is provided with a positioning groove 03. During installation, the valve tube 1 can be positioned and fixed with the valve tube 1 by riveting at the position of the positioning groove 03 of the limit seat 6 on the outer circumference. A through hole is provided in the middle, penetrating the left and right valve needle seats 7. Several refrigerant flow holes 02 are provided in the annulus between the central hole and the outer diameter. The valve core 3 is cylindrical in shape and made of metal. The opening of the cylinder has a flanged shoulder for stroke limiting. Inside the cylinder are stepped holes for installing the large spring 4, valve needle seat 7, small spring 8, and valve needle 9. The bottom of the cylinder has a conical hole that meshes with the conical surface of the valve needle 9. The valve needle seat 7 is also cylindrical and made of metal. Its open end has an outward-curved step, the outer circumference of which is clearance-fitted with the hole in the valve core 3. The cylinder body and the outward-curved step can move freely at their corresponding installation positions on the valve core 3. A threaded hole matching the thread of the valve needle 9 is located at the center of the bottom of the cylinder, and several refrigerant outlet holes 01 are arranged around the axis. The small spring 8 is installed on the outer circumference of the valve needle seat 7 cylinder body, one end abutting against the outward-curved step, and the other end abutting against the valve core 3. Its function is to resist and balance the refrigerant input pressure and provide reset kinetic energy for the output valve needle 9. The filter screen 5 is bowl-shaped or spherical, made of metal, and is fixed to the valve seat 2. The valve needle 9 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 β 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.

[0019] This utility model can be arranged symmetrically or mixed with valve cores of other structural types. When the arrangement is symmetrical, parts such as valve seat 2, valve core 3, filter screen 5, valve needle seat 7, small spring 8, and valve needle 9 with identical structures can be mirrored and combined with limit seat 6 as the midpoint. This can reduce the number of parts, simplify the production process and reduce production costs.

[0020] Assembly: Install the limiting seat 6 at the designated position in valve tube 1 and rivet it in place. Then, install the valve core 3 into the valve seat 2. Next, fit the small spring 8 around the outer circumference of the valve needle seat 7 and then install the valve core 3. Then, install the valve needle 9 through the tapered end of the valve core 3 and screw the valve needle 9 into the threaded hole of the valve needle seat 7 using the screwdriver groove at the end of the valve needle 9. Pre-install the other identical configuration in the same way. Then, install the two pre-installed assemblies into the two ends of the limiting seat 6 inside valve tube 1. During installation, a large spring 4 should be installed between the two valve cores 3 against the valve needle seat 7. Finally, fix the two valve seats 2 in the designated position and rivet them in place. 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 thread of the valve needle 9. Correct the test data at the testing station, and comprehensively fine-tune the distance between the threads of the valve needle 9 and the valve needle seat 7, as well as the strength of the preload of the small spring 8. After the data meets the standards, remove the assembly from the testing 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 high-pressure refrigerant forces the low-pressure valve core 3 to move forward. As the flow rate and pressure of the high-pressure refrigerant increase, the flange of the low-pressure valve core 3 then contacts the valve seat 2, blocking the flow groove 04. The high-pressure refrigerant continues to push the output valve needle seat 7 and valve needle 9 forward. Although the two valve cores 3 do not achieve complete synchronization between opening and closing, the large spring 4 can automatically coordinate and buffer pressure fluctuations between the two valve cores 3 and the two valve needles 9. The device can meet the basic requirements of bidirectional variable throttling of the system. The arrows show a schematic diagram of the refrigerant flow path. The amount of refrigerant flowing out depends on the refrigerant pressure and the stroke of the valve needle 9.

Claims

1. A simple bidirectional variable throttling device, characterized in that: It consists of a valve tube, valve seat, valve core, large spring, filter screen, limit seat, valve needle seat, small spring, and valve needle. The valve tube is a circular tube made of metal. The valve seat is cylindrical, with its 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 its 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, and each flow groove is sealed on one side. The length of the flow groove should be sufficient to allow for the flow of refrigerant on the left and right sides as the valve core stroke changes. 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 valve core reaches its maximum stroke from the limit seat. The high-pressure refrigerant flows through the flow groove of the valve seat and through the flow hole of the limit seat, pushing the low-pressure valve needle seat forward. The refrigerant flows out from the valve core cone hole through the liquid outlet of the valve needle seat. The small spring is installed on the outer circumference of the valve needle seat cylinder, with one end abutting against the outward 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 output valve needle.

2. The simple bidirectional variable throttling device according to claim 1, characterized in that: The limiting seat is made of metal or nylon material and is circular in shape. Its outer diameter is matched with the inner diameter of the valve tube. The outer diameter is provided with a fixing groove. The limiting seat and the valve tube are positioned and fixed at the fixing groove. The limiting seat is provided with a through hole in the middle that passes through the left and right valve needle seats. Several refrigerant flow holes are provided in the annulus between the central hole and the outer diameter.

3. A simple bidirectional variable throttling device according to claim 1, characterized in that: The valve core is cylindrical in shape and made of metal. The cylinder opening is provided with a flanged shoulder for limiting the stroke. The cylinder is provided with a stepped hole for installing a large spring, valve needle seat, small spring and valve needle. The bottom of the cylinder is provided with a conical hole that meshes with the conical surface of the valve needle cone.

4. A simple bidirectional variable throttling device 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 fitted with the valve core hole with a clearance. The cylinder body and the outward step can move freely in the corresponding installation position of the valve core. The center position of the bottom end of the cylinder is provided with a screw hole that matches the valve needle thread, and several refrigerant outlet passage holes are provided around the axis.

5. A simple bidirectional variable throttling device according to claim 1, characterized in that: 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 screw hole of the valve needle seat.

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