Electronic expansion valve and refrigeration equipment

Abstract

The invention discloses an electronic expansion valve and refrigeration equipment, and the electronic expansion valve comprises a valve body, a valve base and a valve port seat; the valve body comprises a shell and a valve needle assembly, and the valve needle assembly is movably installed on the shell. One end of the valve base is connected to the shell, the valve base is provided with a first cavity and a second cavity which are communicated with each other, and the first cavity is used for allowing the valve needle assembly to penetrate through; and the valve port seat is made of plastic which can resist the temperature not lower than 240 DEG C, the valve port seat is riveted in the second cavity, a valve port is formed in the valve port seat in a penetrating mode, and the valve needle assembly can be inserted into the valve port through the valve port. According to the technical scheme, the sealing performance of the valve needle assembly inserted into the valve port can be optimized, and therefore the using effect of the electronic expansion valve is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and in particular to an electronic expansion valve and refrigeration equipment. Background Art

[0002] In the refrigeration system, the electronic expansion valve is used to adjust and control the refrigerant flow into the evaporator. With the advancement of technology, electronic expansion valves are gradually used in automotive air-conditioning systems, heat pump air-conditioning systems, and battery cooling systems. In the related technology, the valve port of a common electronic expansion valve is made of metal material through machining, and burrs and flanging are easily generated at the sealing position where the valve port contacts the valve needle assembly. When the electronic expansion valve is in the closed state, the burrs and flanging will cause the valve needle assembly to be poorly sealed when plugged into the valve port, which may cause leakage, resulting in poor use of the electronic expansion valve. Summary of the invention

[0003] The main purpose of the present invention is to provide an electronic expansion valve, aiming to optimize the sealing performance of a valve needle assembly inserted into a valve port, thereby improving the use effect of the electronic expansion valve.

[0004] To achieve the above object, the electronic expansion valve proposed in the present invention comprises:

[0005] The valve body comprises a housing and a valve needle assembly, wherein the valve needle assembly is movably mounted on the housing;

[0006] A valve base, one end of which is connected to the housing, the valve base being provided with a first chamber and a second chamber which are interconnected, the first chamber being used for the valve needle assembly to pass through; and

[0007] The valve seat is made of plastic with a temperature resistance of not less than 240 degrees Celsius, the valve seat is riveted in the second chamber, and a valve port is pierced on the valve seat, and the valve port is used for the valve needle assembly to be plugged in.

[0008] Optionally, a mounting boss is provided inside the valve base, and a connecting portion is provided at one end of the valve seat, and the connecting portion is interference fit with the mounting boss.

[0009] Optionally, the mounting boss is arranged at the connection between the first chamber and the second chamber, the mounting boss extends in a ring shape along the inner circumference of the second chamber, the mounting boss is provided with a plug hole, the connecting part is arranged on the side of the valve seat facing the valve base, the connecting part is an annular convexity convexly arranged on the valve seat, and the connecting part is plugged into the plug hole.

[0010] Optionally, in a direction toward the first chamber, an upper end of the mounting boss protrudes beyond an upper end of the connecting portion.

[0011] Optionally, the valve seat is clearance-matched with the second chamber.

[0012] Optionally, the electronic expansion valve further comprises a sealing structure, and the sealing structure is arranged between the valve port seat and the valve base.

[0013] Optionally, a sealing groove is formed on the outer peripheral wall of the valve seat, and the sealing groove is extended along the circumference of the valve seat. The sealing structure is a sealing ring, and the sealing ring is arranged in the sealing groove, and the sealing ring is used to abut against the inner wall of the second chamber.

[0014] Optionally, the valve seat is integrally injection molded.

[0015] Optionally, the valve seat is made of PPS plastic added with 10% to 20% glass fiber or PTFE plastic added with 10% to 20% glass fiber.

[0016] The present invention also provides a refrigeration device, comprising the electronic expansion valve as described above.

[0017] In the technical solution of the present invention, the valve seat is made of plastic. Since the molecules on the surface of the plastic usually present a relatively regular arrangement, this regular arrangement can make the plastic surface have a relatively smooth texture. After further processing of the plastic part, the surface of the plastic valve seat is smoother than the surface of the metal valve seat, and it is not easy for debris to remain in the valve seat. Therefore, when the electronic expansion valve is closed, no debris will remain in the gap between the valve needle assembly and the valve port, so that the valve needle assembly completely seals the valve port. This arrangement can optimize the sealing of the valve needle assembly and the valve port, thereby improving the use effect of the electronic expansion valve. At the same time, the valve seat is made of plastic with a temperature resistance greater than or equal to 240 degrees Celsius, that is, the valve seat will not deform when the ambient temperature is lower than 240 degrees Celsius, so that the overall strength of the valve seat is reliable. The valve seat is connected to the valve base by riveting, which can ensure the connection stability of the valve base and the valve seat. In addition, the valve seat made of plastic also has a certain self-lubricating property. After the valve needle assembly is inserted into the valve port for multiple times, the surface of the valve port can still remain smooth. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of an embodiment of an electronic expansion valve of the present invention;

[0020] Figure 2 for Figure 1 Schematic diagram of the structure when the middle valve base and the valve port seat are assembled;

[0021] Figure 3 for Figure 1 Schematic diagram of the structure without assembly of the middle valve base and the valve port seat.

[0022] Description of Figure Numbers:

[0023] Label name Label name 10 Valve seat 101 First chamber 102 Second chamber 103 Mounting boss 104 Socket 20 Valve seat 201 Valve port 202 Connection 203 Seal groove 204 Sealing ring 30 case 31 Valve needle assembly

[0024] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0029] The invention provides an electronic expansion valve.

[0030] In one embodiment of the present invention, Figures 1 to 3 As shown, the electronic expansion valve includes a valve body, a valve base 10 and a valve port seat 20; the valve body includes a shell 30 and a valve needle assembly 31, and the valve needle assembly 31 is movably mounted on the shell 30; one end of the valve base 10 is connected to the shell 30, and the valve base 10 is provided with a first chamber 101 and a second chamber 102 which are interconnected, and the first chamber 101 is used for the valve needle assembly 31 to pass through; the valve port seat 20 is made of plastic with a temperature resistance of not less than 240 degrees Celsius, the valve port seat 20 is riveted in the second chamber 102, and a valve port 201 is passed through the valve port seat 20, and the valve port 201 is used for the valve needle assembly 31 to be plugged in.

[0031] In the related art, the common valve port 201 is made of metal SUS304 or SUS303Cu and is made by mechanical processing. After the metal parts are processed, some debris will remain in the valve port 201 and is difficult to clean. As a result, when the valve needle assembly 31 is plugged into the valve port 201, the debris will remain in the sealing position of the valve needle assembly 31 and the valve port 201. There is no way to completely seal the valve port 201, so that liquid will leak from the valve port 201, resulting in poor use of the electronic expansion valve. In addition, the debris can easily enter the refrigeration equipment pipeline and cause blockage.

[0032] In the technical solution of the present invention, the valve seat 20 is made of plastic. Since the molecules on the surface of the plastic usually present a relatively regular arrangement, this regular arrangement can make the plastic surface have a relatively smooth texture. After further processing of the plastic part, the surface of the plastic valve seat 20 is smoother than the surface of the metal valve seat 20. It is not easy for debris to remain in the valve seat 20. Therefore, when the electronic expansion valve is closed, no debris will remain in the gap between the valve needle assembly 31 and the valve port 201, so that the valve needle assembly 31 completely seals the valve port 201. This arrangement can optimize the valve needle assembly 31 and the valve port 201. 01's sealing performance can be improved, thereby improving the use effect of the electronic expansion valve. At the same time, the valve seat 20 is made of plastic with a temperature resistance greater than or equal to 240 degrees Celsius, that is, the valve seat 20 will not be deformed when the ambient temperature is lower than 240 degrees Celsius, so that the overall strength of the valve seat 20 is reliable. The valve seat 20 is connected to the valve base 10 by riveting, which can ensure the connection stability of the valve base 10 and the valve seat 20. In addition, the valve seat 20 made of plastic also has a certain self-lubricating property. After the valve needle assembly 31 is inserted into the valve port 201 for multiple times, the surface of the valve port 201 can still remain smooth.

[0033] In this embodiment, the electronic expansion valve also includes a stator, a rotor component and a nut component installed in the shell 30. The valve needle assembly 31 is rotatably connected to the nut component. By applying electric pulses of a certain regularity to the stator, the rotor component is stimulated to rotate, thereby controlling the valve needle assembly 31 to rotate relative to the nut component, thereby controlling the valve needle assembly 31 to move linearly along the axial direction, thereby achieving the approach and distance between the valve needle assembly 31 and the valve port 201.

[0034] In one embodiment, a mounting boss 103 is provided inside the valve base 10 , and a connecting portion 202 is provided at one end of the valve seat 20 . The connecting portion 202 is interference-fitted with the mounting boss 103 .

[0035] Specifically, the advantage of interference fit is that the connection is highly stable, and the structure is simple compared to other connection methods, and no additional structural parts are required to connect the valve seat 20 and the valve base 10. This arrangement facilitates the assembly of the valve seat 20 and the valve base 10, improves efficiency, and can ensure the stability of the connection between the valve seat 20 and the valve base 10. In some other embodiments, the mounting boss 103 is clearance-matched with the connecting portion 202.

[0036] In one embodiment, the mounting boss 103 is disposed at the connection between the first chamber 101 and the second chamber 102. The mounting boss 103 extends in a ring shape along the inner circumference of the second chamber 102. A plug hole 104 is provided in the mounting boss 103. The connecting portion 202 is disposed on the side of the valve seat 20 facing the valve base 10. The connecting portion 202 is an annular protrusion protruding from the valve seat 20. The connecting portion 202 is plugged into the plug hole 104.

[0037] Specifically, the valve seat 20 is first placed in the second chamber 102 so that the axis of the mounting boss 103 coincides with the axis of the connecting portion 202, and the connecting portion 202 is pushed toward the plug hole 104 by a pressing tool. The edge of the connecting portion 202 will be deformed to squeeze into the plug hole 104 of the mounting boss 103. At this time, the friction between the plug hole 104 and the connecting portion 202 is very large, so that the connecting portion 202 and the plug hole 104 can be relatively fixed, thereby connecting the valve seat 20 and the valve base 10 together. This arrangement ensures the connection stability of the valve seat 20 and the valve base 10, and the pressing is a cold processing method, which does not require a heat source for welding, does not cause waste of resources, and can save costs. In some other embodiments, there are multiple mounting protrusions, which are distributed along the circumference of the second chamber 102, and are in the shape of bosses. The connecting part 202 is squeezed and inserted into the hole formed by the multiple mounting protrusions so that the mounting boss 103 and the connecting part 202 have an interference fit.

[0038] In one embodiment, in a direction toward the first chamber 101 , an upper end of the mounting boss 103 protrudes beyond an upper end of the connecting portion 202 .

[0039] Specifically, the upper surface of the mounting boss 103 is higher than the upper surface of the connecting portion 202, so that the connecting portion 202 does not extend into the first chamber 101. If the mounting boss 103 is lower than the connecting portion 202, the side wall of the connecting portion 202 will form an angle with the upper surface of the mounting boss 103, and some debris may remain at the angle. When refrigerant flows in the first chamber 101, it will mix with the debris and remain at the angle, thereby affecting the use effect of the electronic expansion valve. Therefore, the present embodiment is set in this way to avoid this situation, thereby ensuring the use effect of the electronic expansion valve. In some other embodiments, the upper end of the mounting boss 103 is flush with the upper end of the connecting portion 202.

[0040] In one embodiment, the valve seat 20 and the second chamber 102 are clearance-matched.

[0041] Specifically, in this embodiment, the valve seat 20 is cylindrical, the second chamber 102 is circular hole-shaped, and the valve seat 20 and the second chamber 102 are clearance-matched, so that the valve seat 20 is easily installed in the second chamber 102, and it is not easy for oversized impurities to enter the gap between the valve seat 20 and the second chamber 102 during installation. In some other embodiments, the valve seat 20 and the second chamber 102 are interference-fitted.

[0042] In one embodiment, the electronic expansion valve further includes a sealing structure, which is disposed between the valve seat 20 and the valve base 10 .

[0043] Specifically, a sealing structure is provided between the valve seat 20 and the second chamber 102, which can prevent external impurities from entering the valve base 10 and can also ensure that the medium inside the valve base 10 will not leak from here, thereby ensuring the sealing effect.

[0044] In one embodiment, a sealing groove 203 is formed on the outer peripheral wall of the valve seat 20 , and the sealing groove 203 is extended along the circumference of the valve seat 20 . The sealing structure is a sealing ring 204 , which is arranged in the sealing groove 203 and is used to abut the inner wall of the second chamber 102 .

[0045] Specifically, the valve seat 20 is cylindrical, and a sealing groove 203 is provided on the outer periphery of the valve seat 20. The sealing groove 203 extends along the outer periphery of the valve seat 20 to form an annular groove. The sealing structure is a sealing ring 204, which is sleeved in the sealing groove 203. The diameter of the sealing ring 204 is slightly larger than the groove depth of the sealing groove 203, so that a part of the sealing ring 204 protrudes from the outer peripheral surface of the valve seat 20, and the protruding part of the sealing ring 204 can abut against the inner wall of the second chamber 102, thereby sealing the outer peripheral wall of the valve seat 20 and the inner peripheral wall of the second chamber 102 to achieve the sealing purpose. In some other embodiments, the inner wall of the second chamber 102 is provided with an installation groove, which is extended in the circumferential direction, and the sealing ring 204 is provided in the installation groove, and the sealing ring 204 is sleeved on the valve seat 20, and the sealing ring 204 abuts against the groove bottom wall of the installation groove.

[0046] In one embodiment, the valve seat 20 is integrally injection molded.

[0047] Specifically, the one-piece injection-molded valve seat 20 has no welding seams or cutting marks, so the surface of the valve port 201 formed inside the valve port seat 20 is smooth, with a small friction coefficient, and no debris will remain in the valve port 201. This ensures that when the valve needle is inserted into the valve port 201, the valve needle assembly 31 can be completely sealed in the gap of the valve port 201, thereby ensuring the sealing effect, preventing the refrigerant from leaking from the valve port 201 and causing internal leakage of the electronic expansion valve, thereby ensuring the use effect of the electronic expansion valve. In some other embodiments, the valve seat 20 is molded.

[0048] In one embodiment, the valve seat 20 is made of PPS plastic or PTFE plastic.

[0049] Specifically, PPS plastic has the advantages of high hardness, good heat resistance, good thermal stability, high mechanical strength, good chemical resistance and small molding shrinkage; PTFE plastic has the advantages of good high temperature resistance, good low temperature resistance, good mechanical toughness, good corrosion resistance and small friction coefficient. The valve seat 20 made of PPS plastic or PTFE plastic is stable in size and not easy to deform. The surface of the valve seat 20 is smooth and not easy to adhere to impurities. The valve seat 20 has a self-lubricating effect. After the valve needle assembly 31 is inserted into the valve port 201 for multiple times, the surface of the valve port 201 can still remain smooth. This setting can improve the overall performance of the valve seat 20, thereby ensuring the sealing of the electronic expansion valve and ensuring the use effect. In some other embodiments, the valve seat 20 is made of PA plastic.

[0050] Furthermore, the valve seat 20 is made of PPS plastic added with 10% to 20% glass fiber or PTFE plastic added with 10% to 20% glass fiber.

[0051] Specifically, after adding glass fiber to modify the plastics, these plastics can overcome the shortcomings of high brittleness, poor toughness and low impact strength, so that the valve seat 20 made of these two plastics can obtain very excellent comprehensive performance to improve the use effect of the electronic expansion valve.

[0052] According to the data in the table, the mechanical properties of PPS plastic will change to a certain extent when different amounts of glass fiber are added. The greater the amount of glass fiber added to the PPS plastic, the greater the tensile strength, the better the toughness, and the lower the brittleness, but the surface friction coefficient will gradually increase. Among the parameters of PPS plastic with 10% to 20% glass fiber added, the increase in tensile strength is large, and the increase in surface friction coefficient is small, which increases the tensile strength while ensuring the self-lubricating property of the PPS plastic.

[0053]

[0054] The present invention also proposes a refrigeration device, which includes an electronic expansion valve. The specific structure of the electronic expansion valve refers to the above embodiment. Since the refrigeration device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. Among them, the refrigeration device can be used in a vehicle, can be used to cool the driver's cabin, and can also dissipate heat for the components of the vehicle. The electronic expansion valve is used to control the flow of the refrigerant in the refrigerant pipe, thereby controlling the cooling effect on the vehicle.

[0055] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. An electronic expansion valve, applied to refrigeration equipment, characterized in that: The electronic expansion valve comprises: The valve body comprises a housing and a valve needle assembly, wherein the valve needle assembly is movably mounted on the housing; A valve base, one end of which is connected to the housing, the valve base being provided with a first chamber and a second chamber which are interconnected, the first chamber being used for the valve needle assembly to pass through; and The valve seat is made of plastic with a temperature resistance of not less than 240 degrees Celsius, the valve seat is riveted in the second chamber, and a valve port is pierced on the valve seat, and the valve port is used for the valve needle assembly to be plugged in.

2. The electronic expansion valve according to claim 1, characterized in that: A mounting boss is provided inside the valve base, and a connecting portion is provided at one end of the valve seat, and the connecting portion is interference-fitted with the mounting boss.

3. The electronic expansion valve according to claim 2, characterized in that: The mounting boss is arranged at the connection between the first chamber and the second chamber, and the mounting boss extends in a ring shape along the inner circumference of the second chamber. A plug hole is provided in the mounting boss, and the connecting portion is arranged on the side of the valve seat facing the valve base, and the connecting portion is an annular convexity convexly arranged on the valve seat, and the connecting portion is plugged into the plug hole.

4. The electronic expansion valve according to claim 3, characterized in that: In the direction of the first cavity, the upper end of the mounting boss protrudes beyond the upper end of the connecting portion.

5. The electronic expansion valve according to claim 2, characterized in that: The valve seat is clearance-matched with the second chamber.

6. The electronic expansion valve according to claim 1, characterized in that: The electronic expansion valve further comprises a sealing structure, and the sealing structure is arranged between the valve port seat and the valve base.

7. The electronic expansion valve according to claim 6, characterized in that: The outer peripheral wall of the valve seat is provided with a sealing groove, and the sealing groove is extended along the circumference of the valve seat. The sealing structure is a sealing ring, and the sealing ring is arranged in the sealing groove, and the sealing ring is used to abut against the inner wall of the second chamber.

8. The electronic expansion valve according to claim 1, characterized in that: The valve seat is integrally injection molded.

9. The electronic expansion valve according to claim 1, characterized in that: The valve seat is made of PPS plastic added with 10% to 20% glass fiber or PTFE plastic added with 10% to 20% glass fiber.

10. A refrigeration device, characterized in that: The invention comprises the electronic expansion valve as claimed in any one of claims 1 to 9.

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