Expansion valve capable of dynamically and stably throttling

Abstract

The dynamic stable throttling expansion valve comprises an expansion valve body, an inlet of the expansion valve body is in threaded connection with a pressure adjusting device, and the pressure adjusting device comprises a connecting pipe in threaded connection with the expansion valve body; a fixing support, an adjusting ring and a limiting ring are sequentially and fixedly connected to the inner wall of the connecting pipe in the direction away from the expansion valve body, a pressure adjusting unit is inserted into the fixing support, and by means of cooperation of the adjusting ring and the pressure adjusting unit, the flow in the pressure adjusting device can be changed according to changes of refrigerant pressure; meanwhile, when the pressure intensity of the refrigerant is too high, the sealing end makes contact with the limiting ring, circulation of the pressure adjusting device is completely closed, and the situation that the pressure in the expansion valve body is too high, and the position where the overpressure of the expansion valve occurs is transferred to the pressure adjusting device from the interior of the expansion valve body is avoided; and irreversible damage of the expansion valve main body due to overpressure is avoided.

Description

Technical Field

[0001] The present invention relates to an expansion valve, in particular to a dynamic stable throttling expansion valve applied in the field of refrigeration technology. Background Art

[0002] The expansion valve is a crucial component in refrigeration systems, typically installed between the reservoir and the evaporator. It throttles medium-temperature, high-pressure liquid refrigerant through its throttle valve, converting it into low-temperature, low-pressure wet vapor. The refrigerant then absorbs heat in the evaporator, achieving the desired cooling effect. The expansion valve controls flow by adjusting the superheat at the end of the evaporator, preventing underutilization of the evaporator area and cylinder knocking.

[0003] The invention patent CN201611142861.9 specification discloses a control method for an air-conditioning expansion valve. The method uses the indoor ambient temperature and the current indoor ambient humidity to meet the set temperature and humidity conditions to execute a limited valve adjustment process: if the current indoor coil temperature is not greater than the current coil temperature threshold, the current return air superheat is obtained according to the current indoor coil temperature; if the current indoor coil temperature is greater than the current coil temperature threshold, the current return air superheat is obtained according to the current coil temperature threshold; the opening of the expansion valve is adjusted according to the current return air superheat, thereby realizing adaptive adjustment of the expansion valve with changes in temperature and humidity, and improving the system's operating performance and temperature adjustment comfort when the superheat valve is adjusted.

[0004] Patent CN202310017441.1 discloses a correction method for an air conditioner electronic expansion valve. This method calculates the corrected opening of the electronic expansion valve, performs correction verification, and transmits this information to a control module. The control module receives information from the cooling / heating self-correction module and controls the opening of the electronic expansion valve. This method eliminates throttling errors in the electronic expansion valve and improves the reliability of product operation.

[0005] In the prior art, in addition to facing overtemperature, the expansion valve usually also needs to face overpressure. Once the pressure in the expansion valve is too high for a long time, it is very easy to cause irreversible damage to the entire expansion valve system. Summary of the Invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that once the pressure in the expansion valve is too high for a long time, it is very easy to cause irreversible damage to the entire expansion valve system.

[0007] To solve the above problems, the present invention provides a dynamic stable throttling expansion valve, comprising an expansion valve body, an inlet of the expansion valve body being threadedly connected to a pressure regulating device, the pressure regulating device comprising a connecting pipe threadedly connected to the expansion valve body, a sealing ring being connected between the connecting pipe and the expansion valve body, a fixing bracket, an adjusting ring, and a limiting ring being fixedly connected in sequence to the inner wall of the connecting pipe in a direction away from the expansion valve body, and a pressure regulating unit being inserted into the fixing bracket;

[0008] The pressure regulating unit includes an adjusting rod body that is slidably connected to a fixed bracket, an end of the adjusting rod body close to the expansion valve body is fixedly connected to a limiting end, an end of the adjusting rod body away from the expansion valve body passes through an adjusting ring and a limiting ring in sequence and is fixedly connected to a sealing end, an adjusting portion is cut out on the adjusting rod body, the position of which matches the limiting ring and the fixed bracket, and the depth of the adjusting portion gradually becomes shallower from the limiting ring toward the adjusting ring, and a tension spring is fixedly connected between the fixed bracket and the limiting end.

[0009] In the above-mentioned dynamically stable throttling expansion valve, the flow rate in the pressure regulating device can be changed according to the change of the refrigerant pressure, thereby forming a stable refrigerant flow. At the same time, when the refrigerant pressure is too high, the location where the expansion valve overpressure occurs is moved from the expansion valve body to the pressure regulating device, thereby avoiding irreversible damage to the expansion valve body due to overpressure.

[0010] As a further improvement of the present application, a pressure tube is fixedly connected to the side wall of the pressure regulating device. The pressure tube is located on the side of the limiting ring away from the expansion valve body. The pressure tube includes a tube body, and the tube body is connected to the connecting tube. A movable plug is slidably connected to the tube body, and the movable plug has an interference fit with the tube body. The pressure in the connecting tube can be known by observing the height of the movable plug, and corresponding maintenance measures can be formulated.

[0011] As a further improvement of the present application, fluorescent pigments are added to the refrigerant, and the inner wall of the tube body is frosted. When the refrigerant pushes the movable plug to move, it will leave a mark on the inner wall of the tube body. On the one hand, it can prevent the pressure tube from being recycled and reused and causing unnecessary damage. On the other hand, the maximum pressure in the pressure regulating device can also be determined based on the mark, thereby providing a basis for judging the failure of the air-conditioning system.

[0012] As a further improvement of the present application, a safety bottle is provided at the end of the pressure tube away from the pressure regulating device. The safety bottle includes a transparent acrylic bottle body, which is fixedly connected to the tube body. When the movable plug moves toward one end of the original tube body, the air pressure at the end of the tube body away from the pressure regulating device will increase until the end of the tube body away from the pressure regulating device explodes. The presence of the transparent acrylic bottle body can prevent fragments of the broken tube body from splashing, which is not likely to cause safety accidents. At the same time, the transparent acrylic bottle body can also temporarily collect part of the refrigerant to avoid pollution to the environment.

[0013] As another improvement of the present application, a buffer pad is fixedly connected to the inner top of the transparent acrylic bottle body, and a woven mesh is fixedly connected to the lower end of the buffer pad, which can cushion the flying tube fragments and protect the transparent acrylic bottle body, so that the transparent acrylic bottle body is not easily damaged and failed under the impact of the tube body rupture.

[0014] As another improvement supplement of the present application, the woven net is woven from a high-toughness material, which further increases the use effect of the woven net and makes it less likely to be cut and rendered ineffective by flying pipe fragments.

[0015] As another improved supplement to the present application, a plurality of evenly distributed counterweight blocks are fixedly connected to the lower end of the woven net. The plurality of counterweight blocks are all made of magnetic material, and the adjacent sides of two adjacent counterweight blocks repel each other. Under the joint action of the plurality of counterweight blocks, the woven net as a whole can be easily kept in a barrel shape, and the protective effect can be easily maintained.

[0016] In summary, in the present application, by utilizing the cooperation of the regulating ring and the regulating part, it is possible to change the flow rate in the pressure regulating device according to the change of the refrigerant pressure, thereby forming a stable refrigerant flow. At the same time, when the refrigerant pressure is too high, the sealing end contacts the limit ring, completely closing the circulation of the pressure regulating device, avoiding excessive pressure in the expansion valve body, and migrating the location where the expansion valve overpressure occurs from the expansion valve body to the pressure regulating device, avoiding irreversible damage to the expansion valve body due to overpressure.

[0017] At the same time, a pressure tube and a safety bottle are added. By observing the height of the movable plug, the pressure in the connecting pipe can be obtained, and then corresponding maintenance measures can be formulated. The existence of the safety bottle can prevent the fragments of the broken pipe from splashing, which is not easy to cause safety accidents. At the same time, the safety bottle can also temporarily collect part of the refrigerant to avoid pollution to the environment, and increase the safety of the expansion valve body and the pressure regulating device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of an expansion valve with a pressure regulating device according to a first embodiment of the present application;

[0019] Figure 2 This is a schematic structural diagram of a pressure regulating device according to a first embodiment of the present application;

[0020] Figure 3 This is a front cross-sectional view of the pressure regulating device according to the first embodiment of the present application;

[0021] Figure 4 This is a schematic diagram of the refrigerant flow in the pressure regulating device according to the first embodiment of the present application;

[0022] Figure 5Schematic diagram of the pressure regulating unit in the first embodiment of the present application moving to different states;

[0023] Figure 6 This is a schematic structural diagram of a pressure regulating unit according to the first embodiment of the present application;

[0024] Figure 7 This is a schematic structural diagram of an expansion valve with a pressure tube and a safety bottle according to a second embodiment of the present application;

[0025] Figure 8 This is a schematic structural diagram of a pressure regulating device, a pressure tube, and a safety bottle according to a second embodiment of the present application;

[0026] Figure 9 A front cross-sectional view of the regulating device, the pressure tube, and the safety bottle according to the second embodiment of the present application;

[0027] Figure 10 This is a schematic structural diagram of a movable plug in a pressure tube according to the second embodiment of the present application.

[0028] Description of the numbers in the figure:

[0029] 1 Expansion valve body, 2 Pressure regulating device, 201 Connecting pipe, 202 Sealing ring, 203 Limiting ring, 204 Adjusting ring, 205 Fixed bracket, 3 Pressure regulating unit, 301 Adjusting rod, 302 Sealing end, 303 Limiting end, 304 Adjusting part, 4 Tension spring, 5 Pressure tube, 501 Tube, 502 Movable stopper, 6 Safety bottle, 601 Transparent acrylic bottle, 602 Buffer pad, 603 Braided mesh, 604 Counterweight. DETAILED DESCRIPTION

[0030] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0031] The first implementation method:

[0032] Figure 1-3 and Figure 6 A dynamic stable throttling expansion valve is shown, comprising an expansion valve body 1, with a pressure regulating device 2 threadedly connected to the inlet of the expansion valve body 1. The pressure regulating device 2 comprises a connecting pipe 201 threadedly connected to the expansion valve body 1, a sealing ring 202 connected between the connecting pipe 201 and the expansion valve body 1, and a fixing bracket 205, an adjusting ring 204, and a limiting ring 203 fixedly connected in sequence to the inner wall of the connecting pipe 201 in a direction away from the expansion valve body 1. A pressure regulating unit 3 is inserted into the fixing bracket 205;

[0033] The pressure regulating unit 3 includes an adjusting rod body 301 that is slidably connected to the fixed bracket 205. The end of the adjusting rod body 301 close to the expansion valve body 1 is fixedly connected to the limiting end 303. The end of the adjusting rod body 301 away from the expansion valve body 1 passes through the adjusting ring 204 and the limiting ring 203 in sequence and is fixedly connected to the sealing end 302. An adjusting portion 304 is carved on the adjusting rod body 301, the position of which matches the limiting ring 203 and the fixed bracket 205, and the depth of the adjusting portion 304 gradually becomes shallower from the limiting ring 203 to the direction of the adjusting ring 204. A tension spring 4 is fixedly connected between the fixed bracket 205 and the limiting end 303.

[0034] See also Figure 4-5 When the refrigerant pressure is at a normal stage, the refrigerant flows into the expansion valve body 1 from the end of the pressure regulating unit 3 away from the expansion valve body 1, passes through the gaps between the pressure regulating unit 3 and the limit ring 203 and the regulating ring 204, and passes through the fixing bracket 205 to flow into the expansion valve body 1. When the refrigerant pressure is higher than the preset value, it will generate a thrust on the regulating ring 204 and the regulating part 304, causing the pressure regulating unit 3 to move as a whole toward the expansion valve body 1 until the sealing end 302 contacts the limit ring 203, completely closing the circulation of the pressure regulating device 2, avoiding excessive pressure in the expansion valve body 1, and migrating the location where the expansion valve overpressure occurs from the expansion valve body 1 to the pressure regulating device 2, avoiding irreversible damage to the expansion valve body 1 due to overpressure. At the same time, as the circulation of the pressure regulating device 2 is closed, the refrigerant in the expansion valve body 1 will also decrease, and the temperature detected by the expansion valve body 1 will change greatly in a short period of time. At this time, the entire operation of the air conditioner and the expansion valve body 1 will be shut down, waiting for further maintenance.

[0035] In the present application, by utilizing the cooperation of the regulating ring 204 and the regulating portion 304, it is possible to change the flow rate in the pressure regulating device 2 according to the change in the refrigerant pressure, thereby forming a stable refrigerant flow. At the same time, when the refrigerant pressure is too high, the sealing end 302 contacts the limiting ring 203, completely closing the circulation of the pressure regulating device 2, avoiding excessive pressure in the expansion valve body 1, and moving the location where the expansion valve overpressure occurs from the expansion valve body 1 to the pressure regulating device 2, avoiding irreversible damage to the expansion valve body 1 due to overpressure.

[0036] The second implementation method:

[0037] Figure 7-9 A dynamic stable throttling expansion valve is shown. A pressure tube 5 is fixedly connected to the side wall of the pressure regulating device 2. The pressure tube 5 is located on the side of the limiting ring 203 away from the expansion valve body 1. The pressure tube 5 includes a tube body 501, and the tube body 501 is connected to the connecting tube 201. A movable plug 502 is slidably connected in the tube body 501, and the movable plug 502 is interference fit with the tube body 501.

[0038] See also Figure 10 After the sealing end 302 contacts the limiting ring 203, the refrigerant pressure on the side of the limiting ring 203 away from the expansion valve body 1 will continue to increase before the air conditioner is turned off, thereby pushing the movable plug 502 to move in the direction of the principle pressure regulating device 2 in the pipe body 501. When the maintenance personnel arrive at the site for maintenance, they can know the pressure in the connecting pipe 201 by observing the height of the movable plug 502 and then formulate corresponding maintenance measures.

[0039] The refrigerant is mixed with fluorescent pigments, and the inner wall of the tube body 501 is frosted. When the refrigerant pushes the movable plug 502 to move, it will leave a mark on the inner wall of the tube body 501. On the one hand, it can prevent the pressure tube 5 from being recycled and reused and causing unnecessary damage. On the other hand, the maximum pressure in the pressure regulating device 2 can also be determined based on the mark, thereby providing a basis for judging the failure of the air-conditioning system.

[0040] See also Figure 7-9 A safety bottle 6 is sleeved on the end of the pressure tube 5 away from the pressure regulating device 2. The safety bottle 6 includes a transparent acrylic bottle body 601, which is fixedly connected to the tube body 501. When the movable plug 502 moves toward one end of the original tube body 501, the air pressure at the end of the tube body 501 away from the pressure regulating device 2 will increase until the end of the tube body 501 away from the pressure regulating device 2 explodes. The presence of the transparent acrylic bottle body 601 can prevent the fragments of the broken tube body 501 from splashing, which is not likely to cause a safety accident. At the same time, the transparent acrylic bottle body 601 can also temporarily collect part of the refrigerant to avoid pollution to the environment.

[0041] In particular, the structural strength of the tube body 501 can be controlled so that the movable plug 502 is located inside the safety bottle 6 when the tube body 501 explodes, and the fracture position of the tube body 501 is located inside the safety bottle 6.

[0042] A buffer pad 602 is fixedly connected to the inner top of the transparent acrylic bottle body 601, and a woven mesh 603 is fixedly connected to the lower end of the buffer pad 602, which can cushion the flying fragments of the tube body 501 and protect the transparent acrylic bottle body 601, so that the transparent acrylic bottle body 601 is not easily damaged and failed under the impact of the tube body 501 breaking.

[0043] The braided mesh 603 is woven from a material with high toughness, which further enhances the use effect of the braided mesh 603 and makes the braided mesh 603 less likely to be cut and rendered ineffective by flying fragments of the tube body 501 .

[0044] The lower end of the woven net 603 is fixedly connected to a plurality of evenly distributed counterweight blocks 604. The plurality of counterweight blocks 604 are all made of magnetic material, and the adjacent sides of two adjacent counterweight blocks 604 repel each other. Under the joint action of the plurality of counterweight blocks 604, the woven net 603 as a whole is easy to maintain in a cylindrical shape, and the protective effect is easy to maintain.

[0045] Based on the first embodiment, this embodiment adds a pressure tube 5 and a safety bottle 6. By observing the height of the movable plug 502, the pressure in the connecting pipe 201 can be obtained, and then corresponding maintenance measures can be formulated. The existence of the safety bottle 6 can prevent the fragments of the broken tube body 501 from splashing, which is not likely to cause safety accidents. At the same time, the safety bottle 6 can also temporarily collect part of the refrigerant to avoid pollution to the environment, thereby increasing the safety of the expansion valve body 1 and the pressure regulating device 2.

[0046] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A dynamic stable throttling expansion valve, characterized by: The invention comprises an expansion valve body (1), wherein the inlet of the expansion valve body (1) is threadedly connected to a pressure regulating device (2), wherein the pressure regulating device (2) comprises a connecting pipe (201) threadedly connected to the expansion valve body (1), a sealing ring (202) is connected between the connecting pipe (201) and the expansion valve body (1), and a fixing bracket (205), an adjusting ring (204) and a limiting ring (203) are fixedly connected to the inner wall of the connecting pipe (201) in a direction away from the expansion valve body (1), and a pressure regulating unit (3) is inserted into the fixing bracket (205); The pressure regulating unit (3) comprises an adjusting rod (301) slidably connected to a fixed bracket (205); an end of the adjusting rod (301) close to the expansion valve body (1) is fixedly connected to a limiting end (303); an end of the adjusting rod (301) away from the expansion valve body (1) sequentially passes through an adjusting ring (204) and a limiting ring (203) and is fixedly connected to a sealing end (302); an adjusting portion (304) is cut on the adjusting rod (301) at a position matching the limiting ring (203) and the fixed bracket (205); and the depth of the adjusting portion (304) gradually decreases from the limiting ring (203) toward the adjusting ring (204); and a tension spring (4) is fixedly connected between the fixed bracket (205) and the limiting end (303).

2. The dynamic stable throttling expansion valve according to claim 1, characterized in that: A pressure pipe (5) is fixedly connected to the side wall of the pressure regulating device (2), and the pressure pipe (5) is located on a side of the limiting ring (203) away from the expansion valve body (1). The pressure pipe (5) includes a pipe body (501), and the pipe body (501) is connected to the connecting pipe (201). A movable plug (502) is slidably connected in the pipe body (501), and the movable plug (502) and the pipe body (501) are interference fit.

3. The dynamic stable throttling expansion valve according to claim 2, characterized in that: The inner wall of the tube body (501) is a frosted wall.

4. The dynamic stable throttling expansion valve according to claim 3, characterized in that: A safety bottle (6) is sleeved on one end of the pressure tube (5) away from the pressure regulating device (2). The safety bottle (6) comprises a transparent acrylic bottle body (601), and the transparent acrylic bottle body (601) is fixedly connected to the tube body (501).

5. The dynamic stable throttling expansion valve according to claim 4, characterized in that: The inner top end of the transparent acrylic bottle body (601) is fixedly connected to a buffer pad (602), and the lower end of the buffer pad (602) is fixedly connected to a woven mesh (603).

6. The dynamic stable throttling expansion valve according to claim 5, characterized in that: The braided mesh (603) is made of a high-toughness material.

7. The dynamic stable throttling expansion valve according to claim 6, characterized in that: The lower end of the woven mesh (603) is fixedly connected to a plurality of evenly distributed counterweight blocks (604), wherein the plurality of counterweight blocks (604) are all made of magnetic material, and adjacent sides of two adjacent counterweight blocks (604) repel each other.

Images