Thermal expansion valve

Abstract

The utility model provides a thermostatic expansion valve. The thermostatic expansion valve comprises a valve body; the guide sealing cap is connected with the valve body; the protective cover is of a structure with an opening in one end, the protective cover comprises a containing cavity and is connected with the valve body, and the part of the structure, exposed out of the valve body, of the guide sealing cap is located in the containing cavity. According to the thermal expansion valve, the protective cover is additionally arranged, the part structure, exposed out of the valve body, of the guide sealing cap is located in the containing cavity of the protective cover, the protective cover can play a role in protecting the guide sealing cap, and when the thermal expansion valve is impacted by external force such as falling and collision accidentally, the protective cover can play a role in buffering; the sealing connection between the guide sealing cap and the valve body is prevented from being influenced, the sealing failure between the guide sealing cap and the valve body is avoided, and the leakage problem possibly occurring in the thermostatic expansion valve is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to a thermal expansion valve. BACKGROUND

[0002] The thermal expansion valve of the related art comprises a valve body and a guide cap, and the valve body and the guide cap are sealingly connected to ensure that the system refrigerant does not leak, but the thermal expansion valve may be accidentally dropped, collided or subjected to other impacts during transportation or installation by a customer, so that the guide cap is impacted, the sealing between the guide cap and the valve body is failed, and the product leaks, causing complaints from the customer. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the present application is to provide a thermal expansion valve to solve the leakage problem of the thermal expansion valve caused by impacts due to dropping, collision and other external forces.

[0004] To solve the above technical problems, the present application provides a thermal expansion valve, comprising:

[0005] a valve body;

[0006] a guide cap connected with the valve body;

[0007] a protective cover having an open structure at one end, the protective cover comprising a receiving cavity, the protective cover being connected with the valve body, and a portion of the guide cap exposed from the valve body being located in the receiving cavity.

[0008] The thermal expansion valve of the present embodiment is additionally provided with a protective cover, which can play a buffering role when the thermal expansion valve is accidentally impacted due to dropping, collision and other external forces, so as to protect the sealing connection between the guide cap and the valve body from being affected, avoid the sealing failure between the guide cap and the valve body, and solve the leakage problem that may occur in the thermal expansion valve.

[0009] Optionally, one of the peripheral wall of the valve body and the inner peripheral wall of the protective cover is provided with a clamping groove, and the other is provided with a clamping protrusion, and the clamping protrusion is clamped in the clamping groove.

[0010] Optionally, the clamping protrusion is arranged on the inner peripheral wall of the protective cover, and the clamping protrusion and the clamping groove are in the shape of a matching sharp angle.

[0011] Optionally, the inner cross-sectional area of the protective cover gradually increases in the direction from the sharp corner end of the clamping protrusion to the open end of the protective cover.

[0012] Optionally, the peripheral wall of the protective cover is provided with one or more notched grooves, and a plurality of notched grooves are distributed at intervals along the circumference of the protective cover, and the notched grooves penetrate the open end wall of the protective cover.

[0013] Optionally, the guide cap and the valve body abut and seal, and the abutment and sealing position of the guide cap and the valve body is within the axial range of the notch groove.

[0014] Optionally, there is a gap between the inner wall of the guide cap and the protective cover, and an end wall opposite the opening end of the protective cover is provided with a detection hole penetrating the inner and outer surfaces of the end wall.

[0015] Optionally, the axial end of the valve body has an end wall portion, and the inner wall of the protective cover has a step wall portion facing the end wall portion, and the first gap is between the end wall portion and the step wall portion.

[0016] Optionally, the inner surface of the end wall of the protective cover opposite the opening end has a protrusion, and the second gap is between the protrusion and the end wall of the guide cap, and the first gap is smaller than the second gap.

[0017] Optionally, the peripheral wall of the protective cover includes a first wall portion and a second wall portion connected in the axial direction, the thickness of the first wall portion is smaller than the thickness of the second wall portion, and the first wall portion is closer to the opening end of the protective cover than the second wall portion.

[0018] Optionally, the protective cover is an injection molded part, and the protective cover is made of polyethylene material. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A partial cross-sectional view of a specific embodiment of the thermal expansion valve provided in the present application;

[0020] Figure 2 A partial cross-sectional view of a specific embodiment of the thermal expansion valve provided in the present application; Figure 1 A structural schematic diagram of the thermal expansion valve when the protective cover is removed;

[0021] Figure 3 A partial cross-sectional view of a specific embodiment of the thermal expansion valve provided in the present application; Figure 1 An enlarged view of area A in the middle;

[0022] Figure 4 A partial cross-sectional view of a specific embodiment of the thermal expansion valve provided in the present application; Figure 2 An enlarged view of area B in the middle;

[0023] Figure 5 A partial cross-sectional view of a specific embodiment of the thermal expansion valve provided in the present application; Figure 1 A structural schematic diagram of the protective cover in the thermal expansion valve;

[0024] Figure 6 A partial cross-sectional view of a specific embodiment of the thermal expansion valve provided in the present application; Figure 5 A structural schematic diagram of the protective cover at a second angle;

[0025] Figure 7 A partial cross-sectional view of a specific embodiment of the thermal expansion valve provided in the present application; Figure 5 An axial cross-sectional view of the protective cover along the A-A direction;

[0026] Figure 8 As Figure 5 The axial sectional view of the protective cover along B-B direction;

[0027] Figure 9 As Figure 3 The enlarged view of area C in FIG. 4;

[0028] Wherein, Figures 1-9 The reference signs in the drawings are as follows:

[0029] 1-valve body; 11-clip groove; 12-end wall part;

[0030] 2-guide cap;

[0031] 3-protective cover; 3A-housing cavity; 31-clip protrusion; 32-notch groove; 33-detection hole; 34-step wall part; 35-protruding part; 36-end wall; 371-first wall part; 372-second wall part. DETAILED DESCRIPTION

[0032] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0033] Please refer to Figures 1-4 , Figure 1 The partial sectional view of one specific embodiment of the thermal expansion valve provided by the present application; Figure 2 As Figure 1 The structural schematic view of the thermal expansion valve when the protective cover is removed; Figure 3 As Figure 1 The enlarged view of area A in FIG. 4; Figure 4 As Figure 2 The enlarged view of area B in FIG. 4.

[0034] The present embodiment provides a thermal expansion valve, which comprises: a valve body 1, a guide cap 2 connected with the valve body 1, and a protective cover 3 having an open end structure, wherein the protective cover 3 comprises a housing cavity 3A, the protective cover 3 is connected with the valve body 1, and the part of the guide cap 2 exposed to the valve body 1 is located in the housing cavity 3A.

[0035] The thermal expansion valve of the present embodiment is additionally provided with the protective cover 3, which is connected with the valve body 1 and covers the part of the guide cap 2 exposed to the valve body 1. Thus, the protective cover 3 can play a protective role for the guide cap 2. When the thermal expansion valve is accidentally impacted by external force such as falling or collision, the protective cover 3 can play a buffering role to avoid the external force directly acting on the guide cap 2, protect the sealing connection between the guide cap 2 and the valve body 1 as much as possible, avoid the sealing failure between the guide cap 2 and the valve body 1 as much as possible, and solve the possible leakage problem of the thermal expansion valve as much as possible.

[0036] The protective cover 3 can be made of a high polymer material.

[0037] As arranged above, the high polymer material has good toughness and ductility, so that when the thermal expansion valve is impacted due to external force such as falling, collision, etc., the protective cover 3 can absorb part of the impact energy through its own deformation, thereby playing a buffering role and protecting the sealed connection between the guide cap 2 and the valve body 1 as much as possible; at the same time, the high polymer material also has the advantages of small density, light weight, high production efficiency, low cost, etc.

[0038] In some embodiments of the present application, the protective cover 3 is an injection molded part, and the protective cover 3 is made of a polyethylene material.

[0039] The protective cover 3 is an injection molded part, in other words, the protective cover 3 is formed by injection molding, which has the advantages of high cost-effectiveness, good quality consistency, strong flexibility, high production efficiency, high precision, and wide material application range; the protective cover 3 is made of a polyethylene material, which has excellent flowability in a molten state and excellent processability; the polyethylene material has a short cooling and solidification time and a fast injection molding cycle, which significantly improves the production efficiency of the protective cover 3; the polyethylene material has high strength and impact resistance, which effectively improves the protection performance of the protective cover 3.

[0040] Please continue to refer to Figure 3 and Figure 4 In the present embodiment, the outer peripheral wall of the valve body 1 is provided with a clamping groove 11, and the inner peripheral wall of the protective cover 3 is provided with a clamping protrusion 31, and the clamping protrusion 31 is clamped in the inside of the clamping groove 11.

[0041] As arranged above, on the one hand, the valve body 1 and the protective cover 3 can be fixed by the clamping and fitting of the clamping protrusion 31 and the clamping groove 11, which ensures the reliable connection of the valve body 1 and the protective cover 3, and has a simple structure, which improves the production efficiency of the thermal expansion valve; on the other hand, when the thermal expansion valve is impacted due to external force such as falling, collision, etc., the protective cover 3 can transmit part of the impact force to the valve body 1 through the clamping protrusion 31, so as to avoid the impact force acting directly on the guide cap 2 as much as possible, so that the sealed connection between the guide cap 2 and the valve body 1 is not affected, and the leakage problem that may occur in the thermal expansion valve is solved.

[0042] The structure of the clamping groove 11 is not limited, for example, in some embodiments of the present application, the clamping groove 11 is an annular structure arranged around the valve body 1, the design of the annular clamping groove simplifies the assembly process, and the protective cover 3 can be easily sleeved on the outer periphery of the valve body 1 without complex alignment operation, thereby improving the assembly efficiency of the protective cover 3; in some other embodiments of the present application, the clamping grooves 11 are arranged along the circumference of the valve body 1 at intervals, and the clamping grooves 11 and the clamping protrusions 31 are arranged one by one and are distributed at intervals, only the local area of the clamping groove 11 is processed, and the valve body 1 maintains the complete wall thickness in the non-clamping groove area, thereby avoiding the weakening of the entire circumferential wall thickness of the valve body 1 by the annular clamping groove, the valve body 1 has higher structural strength, and the number and distribution of the clamping grooves 11 can be adjusted according to actual requirements, and the design flexibility is higher.

[0043] In the present embodiment, the clamping groove 11 is arranged on the outer peripheral wall of the valve body 1, and the clamping protrusion 31 is arranged on the inner peripheral wall of the protective cover 3. In some other embodiments of the present application, the outer peripheral wall of the valve body 1 is provided with the clamping protrusion 31, and the inner peripheral wall of the protective cover 3 is provided with the clamping groove 11, which is also feasible and can achieve the above technical effects.

[0044] By Figure 3 and Figure 4 It can be seen that, in the present embodiment, the clamping protrusion 31 is arranged on the inner peripheral wall of the protective cover 3, and the clamping protrusion 31 and the clamping groove 11 are matched in the form of sharp corners.

[0045] As arranged above, on the one hand, the sharp-cornered clamping groove 11 has good directivity, so that the clamping protrusion 31 can slide along the inner wall of the clamping groove 11 and be finally positioned during the assembly of the protective cover 3, thereby improving the assembly efficiency of the protective cover 3; on the other hand, in the direction close to the free end of the clamping protrusion 31, the cross-sectional area of the clamping protrusion 31 gradually decreases, so that the clamping protrusion 31 is easy to deform under the action of impact force to play a role in energy absorption, thereby reducing the influence of the impact force on the thermal expansion valve and avoiding the sealing failure between the guide cap 2 and the valve body 1 as much as possible.

[0046] Please refer to Figure 5 and Figure 6 , Figure 5 for Figure 1 the structure diagram of the protective cover in the thermal expansion valve; Figure 6 for Figure 5 the structure diagram of the second angle of the protective cover.

[0047] In the present embodiment, from the sharp corner end of the clamping protrusion 31 to the opening end of the protective cover 3, the inner cross-sectional area of the protective cover 3 gradually increases.

[0048] As arranged above, the gradual increase of the inner cross-sectional area of the protective cover 3 makes the protective cover 3 have a larger opening, which is easier to align and sleeve into the valve body 1 during assembly, reduces the resistance of the protective cover 3 during assembly, and improves the assembly efficiency of the protective cover 3.

[0049] Please refer to Figures 5-7 , Figure 7 For Figure 5 Protective cover third angle structure diagram.

[0050] In this embodiment, the peripheral wall of the protective cover 3 is provided with one or more notched grooves 32, and the plurality of notched grooves 32 are distributed along the circumference of the protective cover 3 and penetrate the open end wall of the protective cover 3, that is, the opening of the notched groove 32 is located on the end face of the open end of the protective cover 3.

[0051] As arranged above, the notched groove 32 can reduce the amount of material of the open end of the protective cover 3, thereby adjusting the elasticity of the open end of the protective cover 3. During the assembly of the protective cover 3, the open end of the protective cover 3 is more likely to deform, reducing the resistance during the assembly of the protective cover 3, facilitating the clamping of the clamping protrusion 31 in the inner part of the clamping groove 11, improving the assembly smoothness of the protective cover 3, and further improving the assembly efficiency of the protective cover 3.

[0052] Further, in this embodiment, the guide cap 2 and the valve body 1 are in abutting sealing, and the abutting sealing position of the guide cap 2 and the valve body 1 is located within the axial range of the notched groove 32.

[0053] It can be understood that when the protective cover 3 is arranged outside the part of the guide cap 2 exposed to the valve body 1, if the sealing of the guide cap 2 and the valve body 1 fails and leaks, it cannot be directly observed from the outside. Therefore, the abutting sealing position of the guide cap 2 and the valve body 1 is located within the axial range of the notched groove 32, and the notched groove 32 can also serve as a detection channel. The user can insert a detection device from the outside to the inside through the notched groove 32, and detect the leakage at the abutting sealing position of the guide cap 2 and the valve body 1. When the thermal expansion valve is detected to leak, maintenance can be performed in time to solve the problem of customer complaints.

[0054] Specifically, the flowmeter is inserted from the notched groove 32, the reference flow value displayed by the flowmeter is recorded, and the reference flow value represents the flow of the valve in the normal working state without leakage; the reading of the flowmeter is continuously monitored, and if the flow value displayed by the flowmeter is higher than the reference flow value, it may indicate that the valve has a leak.

[0055] Please continue to refer to Figure 6 , Figure 8 and Figure 9 , Figure 8 For Figure 5 Axial sectional view of the protective cover along the direction of B-B; Figure 9 For Figure 3 Enlarged view of area C in FIG.

[0056] In the embodiment, a gap is provided between the inner wall of the guide cap 2 and the protective cover 3, and the end wall 36 opposite to the opening end of the protective cover 3 is provided with a detection hole 33 penetrating through the inner and outer surfaces of the end wall 36.

[0057] As arranged above, a gap is provided between the inner wall of the guide cap 2 and the protective cover 3, and if leakage occurs at the abutting sealing position between the guide cap 2 and the valve body 1, part of the fluid can enter between the end wall of the guide cap 2 facing away from the valve body 1 and the end wall 36 of the protective cover 3 through the gap between the inner wall of the guide cap 2 and the protective cover 3. At this time, the user can also insert the detection device from the outside to the inside through the detection hole 33 to detect the leakage of the valve, and timely maintenance can be performed when the heat expansion valve is detected to be leaking, so as to solve the problem of customer complaints.

[0058] In some embodiments of the present application, when the protective cover 3 is simultaneously provided with the notch groove 32 and the detection hole 33, the user can detect the leakage of the valve in two directions of radial and axial directions, so as to avoid the detection dead angle and improve the detection accuracy.

[0059] By Figure 7 It can be seen that in the embodiment, the number of detection holes 33 is three, and the three detection holes 33 are distributed in a circumferential direction. It can be understood that in practice, the number of detection holes 33 is not limited, and the number of detection holes 33 can be at least one.

[0060] Please continue to refer to Figure 3 In the embodiment, the axial end portion of the valve body 1 has an end wall portion 12, the inner wall of the protective cover 3 has a stepped wall portion 34 facing the end wall portion 12, and the first spacing is provided between the end wall portion 12 and the stepped wall portion 34.

[0061] As arranged above, when the heat expansion valve is accidentally impacted by external force such as falling, collision, etc., on one hand, the protective cover 3 can transmit the impact force to the valve body 1 through the clamping protrusion 31, and on the other hand, the clamping protrusion 31 can also offset part of the impact force by itself deformation, thereby playing a buffering role.

[0062] When the impact force is large, the protective cover 3 will deform in the direction close to the valve body 1 under the action of the impact force, and the impact force is transmitted to the valve body 1 through the abutting of the end wall portion 12 and the stepped wall portion 34, so as to reduce the direct action of the external force on the guide cap 2 as much as possible; at the same time, the stepped wall portion 34 also deforms to offset part of the impact force, thereby reducing the impact of the impact force on the heat expansion valve, and avoiding the sealing failure between the guide cap 2 and the valve body 1 as much as possible.

[0063] Please continue to refer to Figure 3 In the embodiment, the inner surface of the end wall 36 opposite to the opening end of the protective cover 3 has a protruding portion 35, and the second spacing is provided between the protruding portion 35 and the end wall of the guide cap 2 in the axial direction of the guide cap 2, and the first spacing is smaller than the second spacing.

[0064] As set forth above, when the thermal expansion valve is impacted by external force due to falling, collision or the like, on the one hand, the protective cover 3 can transmit the impact force to the valve body 1 through the clamping protrusion 31, and on the other hand, the clamping protrusion 31 can also offset part of the impact force by itself deformation, thereby playing a buffering role.

[0065] When the impact force is large, the protective cover 3 will deform in the direction close to the valve body 1 under the action of the impact force, and the impact force is transmitted to the valve body 1 through the abutment of the end wall part 12 and the step wall part 34, so as to reduce the external force directly acting on the guide cap 2 as much as possible. At the same time, the step wall part 34 also deforms to offset part of the impact force, thereby reducing the impact of the impact force on the thermal expansion valve.

[0066] When the deformation force of the step wall part 34 is not enough to offset the remaining impact force, the protective cover 3 will continue to deform in the direction close to the valve body 1, at this time, the protective cover 3 will deform through the abutment of the protruding part 35 and the end wall of the guide cap 2 to reduce the impact force, so as to reduce the external force directly acting on the guide cap 2 as much as possible, and to avoid the sealing failure between the guide cap 2 and the valve body 1 as much as possible.

[0067] Please continue to refer to Figure 8 In the embodiment, the peripheral wall of the protective cover 3 includes a first wall part 371 and a second wall part 372 connected in the axial direction, the wall thickness of the first wall part 371 is smaller than that of the second wall part 372, and the first wall part 371 is closer to the opening end of the protective cover 3 than the second wall part 372.

[0068] As set forth above, the wall thickness of the opening end of the protective cover 3 is smaller, the thin-wall design of the opening end of the protective cover 3 cooperates with the notch groove 32, so that the structural strength of the opening end of the protective cover 3 is lower, the opening end of the protective cover 3 is more prone to deformation in the assembly process, the assembly resistance of the protective cover 3 is reduced, and the assembly smoothness of the protective cover 3 is effectively improved.

[0069] As can be seen from 8, in the embodiment, the first wall part 371 and the second wall part 372 form the aforementioned step wall part 34.

[0070] The above is only an example of the embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should be considered as the protection scope of the present application.

Claims

1. A thermostatic expansion valve, characterized by, The utility model relates to a valve body (1) and a guide cap (2) connected with the valve body (1), and a protective cover (3) connected with the valve body (1) and having an open end. One of the outer peripheral wall of the valve body (1) and the inner peripheral wall of the protective cover (3) is provided with a clamping groove (11), and the other is provided with a clamping protrusion (31) clamped in the clamping groove (11). The clamping protrusion (31) is arranged on the inner peripheral wall of the protective cover (3), and the clamping protrusion (31) and the clamping groove (11) are matched in the form of a sharp corner. The inner cross-sectional area of the protective cover (3) gradually increases from the sharp corner end of the clamping protrusion (31) to the open end of the protective cover (3).

2. The thermal expansion valve according to claim 1, characterized in that The peripheral wall of the protective cover (3) is provided with one or more notched grooves (32), and a plurality of notched grooves (32) are arranged at intervals along the circumference of the protective cover (3), and the notched grooves (32) penetrate the open end wall of the protective cover (3).

3. The thermal expansion valve according to claim 2, characterized in that The guide cap (2) and the valve body (1) are in abutting sealing, and the abutting sealing part of the guide cap (2) and the valve body (1) is located in the axial range of the notched groove (32).

4. The thermal expansion valve according to claim 3, characterized in that There is a gap between the inner wall of the guide cap (2) and the protective cover (3), and the end wall (36) opposite to the open end of the protective cover (3) is provided with a detection hole (33) penetrating the inner and outer surfaces of the end wall (36).

5. The thermal expansion valve according to any one of claims 1 to 4, characterized in that The axial end of the valve body (1) has an end wall part (12), the inner wall of the protective cover (3) has a step wall part (34) facing the end wall part (12), and the first spacing is formed between the end wall part (12) and the step wall part (34).

6. The thermal expansion valve according to claim 5, characterized in that The inner surface of the end wall (36) opposite to the open end of the protective cover (3) has a protruding part (35), and the second spacing is formed between the protruding part (35) and the end wall of the guide cap (2) in the axial direction of the guide cap (2), and the first spacing is smaller than the second spacing.

7. The thermal expansion valve according to any one of claims 1 to 4, characterized in that The peripheral wall of the protective cover (3) comprises a first wall part (371) and a second wall part (372) connected in the axial direction, the wall thickness of the first wall part (371) is smaller than that of the second wall part (372), and the first wall part (371) is closer to the open end of the protective cover (3) than the second wall part (372).

8. The thermal expansion valve according to any one of claims 1 to 4, characterized in that The protective cover (3) is an injection molded part made of polyethylene.

9. The thermal expansion valve according to claim 8, characterized in that ​ 10. The thermal expansion valve according to any one of claims 1 to 4, characterized in that ​ 11. The thermal expansion valve according to any one of claims 1 to 4, characterized in that ​

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