Pilot valve elastic piece and pilot valve provided with same and used for four-way reversing valve

By designing a shrapnel with a curled part and annular structure in the pilot valve of the four-way valve, the problem of sliding block disengagement and baffle impact damage under medium pressure fluctuation is solved, and higher stiffness and deformation capabilities are achieved, ensuring that the four-way valve The normal operation and service life of the valve.

CN222255135UActive Publication Date: 2024-12-27ZHEJIANG OUDI FLUID CONTROL CO LTD
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Patent Information

Application Number
CN202420881910.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-26
Publication Date
2024-12-27
Estimated Expiration
2034-04-26

AI Technical Summary

Technical Problem

When the medium pressure fluctuates greatly, the shrapnel cannot resist the slider, causing the slider to break away from the bracket, affecting the normal operation of the system, and under the impact force, it is easy to cause the baffle to collide with the inner wall of the valve pipe. , causing damage.

Method used

A pilot valve shrapnel is designed, including a fixing part, a connecting part and abutment part. A curling part is provided at one end of the abutment part away from the connecting part. The curling part is rolled upwards and forms an annular structure with the abutment part, increasing stiffness, and Vertical sections, folded edges or oblique sections are provided on the curling part to improve deformation and buffering ability and avoid impact damage.

Benefits of technology

Effectively prevent the slider from rushing over the shrapnel when the medium pressure is too high, enhance the stiffness of the abutment part, avoid bending and deformation of the abutment part colliding with the inner wall of the casing, extend the service life of the four-way valve and ensure normal operation.

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Abstract

The utility model provides a pilot valve elastic piece and a pilot valve with the same for a four-way reversing valve, the pilot valve elastic piece comprises an elastic piece body, the elastic piece body comprises a fixing part, a connecting part and an abutting part, and the connecting part is located between the fixing part and the abutting part and connected with the fixing part and the abutting part into a whole; the end, away from the connecting part, of the abutting part is provided with a curled part, the curled part is curled towards the upper portion of the abutting part, the free end of the curled part abuts against the upper surface of the abutting part, and an annular structure is defined by the curled part and the abutting part; the pilot valve for the four-way reversing valve comprises the pilot valve elastic piece. After the pilot valve elastic piece is applied to a pilot valve of a four-way reversing valve, the elastic piece body can be prevented from being impacted and overturned by a sliding block when medium pressure is too large, the rigidity of the abutting part is enhanced, and bending deformation caused by collision between the abutting part and the inner wall of a sleeve under the action of impulsive force is prevented; and the elastic piece body can be prevented from impacting and damaging a sleeve in the pilot valve.
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Description

Technical Field

[0001] The utility model relates to the technical field of pilot valves of four-way valves, in particular to a pilot valve spring and a pilot valve for a four-way reversing valve having the same. Background Art

[0002] The four-way valve reversing valve (hereinafter referred to as the four-way valve) is mainly used in heat pump air conditioners, water heaters and other systems. Its function is to switch the flow direction of the refrigerant flow channel in the system, thereby realizing the cooling, heating, defrosting and other functions of the entire system;

[0003] Among them, the pilot valve is the core component of the four-way valve, and its working reliability is the guarantee for realizing the basic functions of the reversing valve; among them, the support frame assembly is an indispensable component of the pilot valve. The support frame assembly generally includes a bracket, a spring and a slider placed in the bracket. The movement of the bracket drives the movement of the slider to realize the switching of different flow channels. The spring is used to resist the slider to prevent the slider from detaching.

[0004] However, when the medium pressure fluctuates greatly, the spring sheet in the prior art cannot press the slider; under a large impact pressure, the impact force acting on the slider will overturn the spring sheet, causing the slider to detach from the bracket hole, thereby causing the four-way valve to fail to work normally, with serious consequences.

[0005] To this end, Chinese Patent Publication No.: CN209925678U discloses a pilot valve of a four-way valve, the pilot valve of the four-way valve includes a valve tube, a core iron arranged in the valve tube, a valve seat and an anti-overturn bracket assembly. The anti-overturn bracket assembly includes a drag frame, a slider arranged on the drag frame, and a spring with a mounting portion and a supporting portion. The drag frame is connected to the core iron, the slider is slidably arranged on the upper surface of the valve seat, the mounting portion is connected to the drag frame, one side of the supporting portion presses the slider, and the other side of the supporting portion is provided with a baffle, which is bent or extended along the edge of the supporting portion; the pilot valve of the above-mentioned four-way valve is provided with a baffle that is bent and extended or bent along the edge of the supporting portion of the spring to prevent the slider from overturning the spring when the medium pressure is too large. At the same time, the baffle is arranged to be bent or extended along the supporting portion, thereby strengthening the rigidity of the baffle, preventing the baffle from colliding with the inner wall of the valve tube under the action of the impact force and causing bending and deformation, and further ensuring the normal operation of the pilot valve of the four-way valve.

[0006] However, in the pilot valve structure of the above-mentioned four-way valve, after a baffle plate that is bent and extended or folded and extended is provided at the edge of the abutment portion of the reed, under the action of the baffle plate, although it can prevent the slider from overturning the reed when the medium pressure is too high, and can enhance the rigidity of the baffle plate, the baffle plate that is bent and extended or folded and extended at the edge of the abutment portion of the reed does not have the ability to deform. When the medium pressure is too high and impacts the slider, the slider will push the reed to make the baffle plate hit the inner wall of the valve tube. Since the baffle plate does not have the ability to deform, it is easy to cause impact damage to the valve tube, which will affect the service life of the pilot valve of the four-way valve. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a pilot valve spring and a pilot valve for a four-way reversing valve having the same. After the pilot valve spring is applied to the pilot valve of the four-way reversing valve, it can prevent the slider from overturning the spring body when the medium pressure is too large, and strengthen the rigidity of the abutment part to prevent the abutment part from colliding with the inner wall of the sleeve under the action of the impact force, causing bending and deformation. In addition, it can also prevent the spring body from causing impact damage to the sleeve in the pilot valve.

[0008] The utility model provides a pilot valve spring, comprising a spring body, the spring body comprising a fixed portion, a connecting portion and a supporting portion, the connecting portion is located between the fixed portion and the supporting portion and is connected to the fixed portion and the supporting portion as a whole; a curled portion is provided at one end of the supporting portion away from the connecting portion, the curled portion is rolled up toward the top of the supporting portion and the free end of the curled portion is abutted against the upper surface of the supporting portion, and the curled portion and the supporting portion surround each other to form an annular structure.

[0009] The utility model provides a curled portion at one end of the abutting portion away from the connecting portion, and because the curled portion is rolled up toward the top of the abutting portion and the free end of the curled portion abuts against the upper surface of the abutting portion, the rigidity of the abutting portion can be improved. That is, after the pilot valve spring piece is applied to the pilot valve of the four-way reversing valve, it can prevent the slider from overturning the spring piece body when the medium pressure is too large, and strengthen the rigidity of the abutting portion to prevent bending and deformation caused by the collision between the abutting portion and the inner wall of the sleeve under the action of the impact force. Moreover, because the curled portion and the abutting portion surround to form an annular structure, the curled portion can have a certain deformation and buffering capacity, so that when the curled portion hits the inner wall of the sleeve, it can avoid the spring piece body from causing impact damage to the inner wall of the sleeve, thereby further ensuring the normal operation of the pilot valve of the four-way valve.

[0010] In a possible embodiment, a vertical section is provided on the free end of the curled portion, and one end of the vertical section away from the curled portion abuts against the upper surface of the abutting portion; by providing the vertical section on the free end of the curled portion, and because one end of the vertical section away from the curled portion abuts against the upper surface of the abutting portion, the vertical section can reliably support the curled portion, thereby avoiding bending and deformation caused by the collision of the curled portion with the inner wall of the sleeve.

[0011] In a possible embodiment, a folded edge is provided on the front side and / or the rear side of the curled portion, and the folded edge is folded toward the inside or outside of the curled portion and abuts against the curled portion; by providing a folded edge on the front side and / or the rear side of the curled portion, and the folded edge is folded toward the inside or outside of the curled portion and abuts against the curled portion, the bending and deformation of the curled portion can be effectively avoided when the curled portion collides with the inner wall of the sleeve.

[0012] In a possible embodiment, one end of the folded edge extends to the end of the vertical section away from the curled portion, the other end of the folded edge extends to the end of the abutting portion away from the curled portion and leaves a gap with the connecting portion, and the end of the vertical section away from the curled portion abuts against the folded edge where the abutting portion is located; by adopting this structure, the structural strength of the abutting portion and the vertical section can be further improved, that is, the abutting portion and the vertical section can achieve reliable support for the curled portion, thereby preventing the slider from overturning the spring body when the medium pressure is too large, and avoiding bending and deformation of the curled portion.

[0013] In a possible embodiment, a pressing portion protruding downward from the abutting portion is provided in the middle portion of the abutting portion, and the pressing portion is used to abut against the upper end surface of the slider in the pilot valve; when the folded edge is folded toward the outside of the curled portion, the lower surface of the folded edge is higher than the lower end of the pressing portion; by providing a pressing portion protruding downward from the abutting portion in the middle portion of the abutting portion, the abutting portion presses the slider through the pressing portion, which is beneficial for the abutting portion to better apply force to the slider and further prevent the slider from detaching from the bracket, and because when the folded edge is folded toward the outside of the curled portion, the lower surface of the folded edge is higher than the lower end of the pressing portion, the lower end of the pressing portion can be reliably pressed against the upper end surface of the slider.

[0014] In a possible embodiment, an inclined section is provided on the free end of the curled portion, and an extension section is provided on the end of the inclined section away from the curled portion, and the extension section extends to the upper surface of the abutting portion and is fixed to the abutting portion; by adopting this structure, under the action of the inclined section and the extension section, the inclined section and the extension section can reliably support the curled portion, thereby avoiding bending and deformation caused by the collision of the curled portion with the inner wall of the sleeve, and in addition, the extension section can be fixed to the abutting portion by welding.

[0015] In a possible embodiment, a folded edge is provided on the front side and / or the rear side of the curled portion, and the folded edge is folded toward the inside or outside of the curled portion and abuts against the curled portion; by providing a folded edge on the front side and / or the rear side of the curled portion, and the folded edge is folded toward the inside or outside of the curled portion and abuts against the curled portion, the bending and deformation of the curled portion can be effectively avoided when the curled portion collides with the inner wall of the sleeve.

[0016] In a possible embodiment, one end of the folded edge extends to the end of the oblique section away from the curled portion, and the other end of the folded edge extends to the end of the abutting portion away from the curled portion and leaves a gap with the connecting portion, and when the folded edge is folded toward the inside of the curled portion, the extended section abuts and is fixed on the folded edge where the abutting portion is located; by adopting this structure, the structural strength of the abutting portion and the oblique section can be further improved, that is, the abutting portion and the oblique section can achieve reliable support for the curled portion, thereby preventing the slider from overturning the spring body when the medium pressure is too large, and avoiding bending and deformation of the curled portion.

[0017] In a possible embodiment, a pressing portion protruding downward from the abutting portion is provided in the middle portion of the abutting portion, and the pressing portion is used to abut against the upper end surface of the slider in the pilot valve; when the folded edge is folded toward the outside of the curled portion, the lower surface of the folded edge is higher than the lower end of the pressing portion; by providing a pressing portion protruding downward from the abutting portion in the middle portion of the abutting portion, the abutting portion presses the slider through the pressing portion, which is beneficial for the abutting portion to better apply force to the slider and further prevent the slider from detaching from the bracket, and because when the folded edge is folded toward the outside of the curled portion, the lower surface of the folded edge is higher than the lower end of the pressing portion, the lower end of the pressing portion can be reliably pressed against the upper end surface of the slider.

[0018] A pilot valve for a four-way reversing valve comprises an electromagnet, a sleeve, a valve core, a spring, a valve seat, a slider and a bracket; the electromagnet is fixed on one end of the sleeve, the valve seat is fixed on the side wall of the sleeve, the valve core is arranged in the sleeve between the electromagnet and the valve seat and can move in the axial direction of the sleeve, the spring is arranged between the valve core and the electromagnet, and the spring is used to apply a thrust to the valve core to move away from the electromagnet; one end of the bracket is fixed to the end of the valve core away from the spring, and the slider is vertically movably penetrated in the other end of the bracket; the pilot valve for a four-way reversing valve also comprises the above-mentioned pilot valve spring piece, the fixing part is fixed to the end of the valve core away from the spring, and the abutting part abuts against the It rests on the upper end of the slider and is used to apply a downward thrust to the slider so that the lower end of the slider rests on the valve seat; after adopting the above-mentioned pilot valve spring for the four-way reversing valve, the pilot valve can prevent the slider from overturning the spring body when the medium pressure is too large, and strengthen the rigidity of the abutting part to prevent the bending and deformation caused by the collision between the abutting part and the inner wall of the sleeve under the action of the impact force. Moreover, since the curled part and the abutting part are surrounded to form an annular structure, the curled part can have a certain deformation and buffering capacity, so that when the curled part hits the inner wall of the sleeve, it can avoid the spring body from causing impact damage to the inner wall of the sleeve, thereby further ensuring the normal operation of the pilot valve of the four-way valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the pilot valve spring piece when the technical solution of implementation mode 1 is adopted;

[0020] Figure 2-1It is a schematic diagram of the structure when the curling portion adopts a semicircular structure;

[0021] Figure 2-2 It is a schematic diagram of the structure when the curling portion adopts an arc-shaped structure;

[0022] Figure 2-3 It is a schematic diagram of the structure when the curling portion adopts a rectangular structure;

[0023] Figure 2-4 It is a structural schematic diagram when the curling portion adopts a triangular structure;

[0024] Figure 2-5 It is a schematic diagram of the structure when the curling portion adopts a trapezoidal structure;

[0025] Figure 3 It is a first three-dimensional structural schematic diagram when the pilot valve spring piece adopts the technical solution of implementation mode 4;

[0026] Figure 4 A second three-dimensional structural schematic diagram of the pilot valve spring piece when the technical solution of the fourth implementation mode is adopted;

[0027] Figure 5 A third three-dimensional structural schematic diagram of the pilot valve spring piece when the technical solution of the fourth implementation mode is adopted;

[0028] Figure 6 It is a three-dimensional structural schematic diagram of the pilot valve spring piece when the technical solution of implementation mode five is adopted;

[0029] Figure 7 It is a schematic diagram of the three-dimensional structure when the pilot valve spring piece adopts the technical solution of implementation mode 6;

[0030] Figure 8 It is a schematic diagram of the cross-sectional structure of a pilot valve for a four-way reversing valve. DETAILED DESCRIPTION

[0031] First, those skilled in the art should understand that these embodiments are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0032] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it 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. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0033] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] The present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0035] Implementation Method 1

[0036] See also Figure 1 As shown, an embodiment of the present application discloses a pilot valve spring, including a spring body 1, the spring body 1 includes a fixing portion 11, a connecting portion 12 and a resting portion 13, the connecting portion 12 is located between the fixing portion 11 and the resting portion 13 and is connected to the fixing portion 11 and the resting portion 13 as a whole; a curled portion 14 is provided at one end of the resting portion 13 away from the connecting portion 12, the curled portion 14 is rolled up toward the top of the resting portion 13 and the free end of the curled portion 14 rests on the upper surface of the resting portion 13, and the curled portion 14 and the resting portion 13 surround each other to form an annular structure.

[0037] A vertical section 15 is provided on the free end of the curled portion 14, and one end of the vertical section 15 away from the curled portion 14 abuts against the upper surface of the abutting portion 13; by providing the vertical section on the free end of the curled portion, and because one end of the vertical section away from the curled portion abuts against the upper surface of the abutting portion, the vertical section can reliably support the curled portion, thereby avoiding bending and deformation caused by collision between the curled portion and the inner wall of the sleeve.

[0038] Implementation Method 2

[0039] See also Figure 2-1 , Figure 2-2 , Figure 2-3 , Figure 2-4 and Figure 2-5 As shown, the difference from the first embodiment is that the cross section of the curling portion 14 can be semicircular, arc-shaped, rectangular, triangular, trapezoidal, etc. This embodiment is only an example of the shape of the curling portion.

[0040] Implementation Method 3

[0041] See again Figure 2-1 , Figure 2-2 , Figure 2-3 and Figure 2-4As shown, the top of the curled portion can be a dome-shaped structure. By setting the top of the curled portion to a dome-shaped structure, the valve core in the pilot valve for the four-way reversing valve can reduce the friction resistance between the curled portion and the inner wall of the sleeve when driving the spring body to move, thereby making the spring body move more smoothly relative to the sleeve and effectively avoiding wear of the curled portion and the inner wall of the sleeve.

[0042] Implementation Method 4

[0043] See also Figure 3 , Figure 4 and Figure 5 As shown, what is different from the first embodiment is that: a folded edge 16 is provided on the front side and / or the rear side of the curled portion 14, and the folded edge 16 is folded toward the inside or the outside of the curled portion 14 and abuts against the curled portion 14; by providing a folded edge on the front side and / or the rear side of the curled portion, and the folded edge is folded toward the inside or the outside of the curled portion and abuts against the curled portion, the bending and deformation of the curled portion can be effectively avoided when the curled portion collides with the inner wall of the sleeve.

[0044] One end of the folded edge 16 extends to the end of the vertical section 15 away from the curled portion 14, and the other end of the folded edge 16 extends to the end of the abutting portion 13 away from the curled portion 14 and leaves a gap with the connecting portion 12. The end of the vertical section 15 away from the curled portion 14 abuts against the folded edge 16 located at the abutting portion 13. By adopting this structure, the structural strength of the abutting portion and the vertical section can be further improved, that is, the abutting portion and the vertical section can achieve reliable support for the curled portion, thereby preventing the slider from overturning the spring body when the medium pressure is too large, and avoiding bending and deformation of the curled portion.

[0045] A pressing portion 17 protruding downward from the abutting portion 13 is provided in the middle part of the abutting portion 13, and the pressing portion 17 is used to abut against the upper end surface of the slider 2 in the pilot valve; when the folded edge 16 is folded toward the outside of the curled portion 14, the lower surface of the folded edge 16 is higher than the lower end of the pressing portion 17; after the pressing portion protruding downward from the abutting portion is provided in the middle part of the abutting portion, the abutting portion presses the slider through the pressing portion, which is beneficial for the abutting portion to better apply force to the slider and further prevent the slider from detaching from the bracket, and because when the folded edge is folded toward the outside of the curled portion, the lower surface of the folded edge is higher than the lower end of the pressing portion, the lower end of the pressing portion can be reliably pressed against the upper end surface of the slider.

[0046] Implementation Method 5

[0047] See also Figure 6As shown, what is different from the first embodiment is that an inclined section 18 is provided on the free end of the curled portion 14, and an extension section 19 is provided on the end of the inclined section 18 away from the curled portion 14, and the extension section 19 extends to the upper surface of the abutment portion 13 and is fixed to the abutment portion 13; by adopting this structure, under the action of the inclined section and the extension section, the inclined section and the extension section can reliably support the curled portion, thereby avoiding bending and deformation caused by the collision of the curled portion with the inner wall of the sleeve, and in addition, the extension section can be fixed to the abutment portion by welding.

[0048] Implementation Method 6

[0049] See also Figure 7 As shown, what is different from the fifth embodiment is that: a folded edge 16 is provided on the front side and / or the rear side of the curled portion 14, and the folded edge 16 is folded toward the inside or the outside of the curled portion 14 and abuts against the curled portion 14; by providing a folded edge on the front side and / or the rear side of the curled portion, and the folded edge is folded toward the inside or the outside of the curled portion and abuts against the curled portion, the bending and deformation of the curled portion can be effectively avoided when the curled portion collides with the inner wall of the sleeve.

[0050] One end of the folded edge 16 extends to the end of the oblique section 18 away from the curled portion 14, and the other end of the folded edge 16 extends to the end of the abutting portion 13 away from the curled portion 14 and leaves a gap with the connecting portion 12. When the folded edge 16 is folded toward the inside of the curled portion 14, the extension section 19 abuts against and is fixed on the folded edge 16 located at the position of the abutting portion 13; by adopting this structure, the structural strength of the abutting portion and the oblique section can be further improved, that is, the abutting portion and the oblique section can achieve reliable support for the curled portion, thereby preventing the slider from overturning the spring sheet body when the medium pressure is too large, and avoiding bending and deformation of the curled portion; in the above structure, when the folded edge is folded toward the inside of the curled portion, the extension section abuts against and can be fixed to the folded edge located at the position of the abutting portion by welding.

[0051] A pressing portion 17 protruding downward from the abutting portion 13 is provided in the middle part of the abutting portion 13, and the pressing portion 17 is used to abut against the upper end surface of the slider 2 in the pilot valve; when the folded edge 16 is folded toward the outside of the curled portion 14, the lower surface of the folded edge 16 is higher than the lower end of the pressing portion 17; after the pressing portion protruding downward from the abutting portion is provided in the middle part of the abutting portion, the abutting portion presses the slider through the pressing portion, which is beneficial for the abutting portion to better apply force to the slider and further prevent the slider from detaching from the bracket, and because when the folded edge is folded toward the outside of the curled portion, the lower surface of the folded edge is higher than the lower end of the pressing portion, the lower end of the pressing portion can be reliably pressed against the upper end surface of the slider.

[0052] See also Figure 8As shown, a pilot valve for a four-way reversing valve comprises an electromagnet 3, a sleeve 4, a valve core 5, a spring 6, a valve seat 7, a slider 2 and a bracket 8; the electromagnet 3 is fixed on one end of the sleeve 4, the valve seat 7 is fixed on the side wall of the sleeve 4, the valve core 5 is arranged in the sleeve 4 between the electromagnet 3 and the valve seat 7 and can move along the axial direction of the sleeve 4, the spring 6 is arranged between the valve core 5 and the electromagnet 3, and the spring 6 is used to apply a thrust to the valve core 5 to move toward the side away from the electromagnet 3; one end of the bracket 8 is fixed to the end of the valve core 5 away from the spring 6, and the slider 2 is vertically movably penetrated in the other end of the bracket 8; the pilot valve for a four-way reversing valve also includes the above-mentioned pilot valve spring piece, the fixing part 11 is fixed to the end of the valve core 5 away from the spring 6, the abutting part 13 abuts against the upper end of the slider 2 and is used to apply a thrust to the slider 2 The thrust is to make the lower end of the slider 2 abut against the valve seat 7; after the pilot valve for the four-way reversing valve adopts the above-mentioned pilot valve spring, it can prevent the slider from overturning the spring body when the medium pressure is too large, and strengthen the rigidity of the abutting part to prevent the bending and deformation caused by the collision between the abutting part and the inner wall of the sleeve under the action of the impact force, and because the curled part and the abutting part are surrounded to form an annular structure, the curled part can have a certain deformation and buffering capacity, so that when the curled part hits the inner wall of the sleeve, the spring body can be prevented from causing impact damage to the inner wall of the sleeve, further ensuring the normal operation of the pilot valve of the four-way valve; the working principle of the above-mentioned pilot valve for the four-way reversing valve is the prior art, such as the working principle of a pilot valve of a four-way valve disclosed in Chinese Patent Announcement No.: CN209925678U, so it will not be repeated here.

[0053] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A pilot valve spring, comprising a spring body (1), wherein the spring body (1) comprises a fixing portion (11), a connecting portion (12) and a supporting portion (13), wherein the connecting portion (12) is located between the fixing portion (11) and the supporting portion (13) and is integrally connected to the fixing portion (11) and the supporting portion (13); characterized in that: A curled portion (14) is provided at one end of the abutting portion (13) away from the connecting portion (12); the curled portion (14) is rolled up toward the top of the abutting portion (13) and the free end of the curled portion (14) abuts against the upper surface of the abutting portion (13); the curled portion (14) and the abutting portion (13) surround each other to form an annular structure.

2. The pilot valve spring according to claim 1, characterized in that: A vertical section (15) is arranged on the free end of the curled portion (14), and one end of the vertical section (15) away from the curled portion (14) abuts against the upper surface of the abutting portion (13).

3. The pilot valve spring according to claim 2, characterized in that: A folded edge (16) is provided on the front side and / or the rear side of the curled portion (14); the folded edge (16) is folded toward the inside or outside of the curled portion (14) and abuts against the curled portion (14).

4. The pilot valve spring according to claim 3, characterized in that: One end of the folded edge (16) extends to the end of the vertical section (15) away from the curled portion (14), and the other end of the folded edge (16) extends to the end of the abutting portion (13) away from the curled portion (14) with a gap between the end and the connecting portion (12), and the end of the vertical section (15) away from the curled portion (14) abuts against the folded edge (16) located at the position of the abutting portion (13).

5. The pilot valve spring according to claim 4, characterized in that: A pressing portion (17) is provided in the middle of the abutting portion (13) and protrudes downward from the abutting portion (13). The pressing portion (17) is used to abut against the upper end surface of the slider (2) in the pilot valve. When the folded edge (16) is folded toward the outside of the curled portion (14), the lower surface of the folded edge (16) is higher than the lower end of the pressing portion (17).

6. The pilot valve spring according to claim 1, characterized in that: An oblique section (18) is provided on the free end of the curled portion (14), and an extension section (19) is provided on one end of the oblique section (18) away from the curled portion (14); the extension section (19) extends to the upper surface of the abutting portion (13) and is fixed to the abutting portion (13).

7. The pilot valve spring according to claim 6, characterized in that: A folded edge (16) is provided on the front side and / or the rear side of the curled portion (14); the folded edge (16) is folded toward the inside or outside of the curled portion (14) and abuts against the curled portion (14).

8. The pilot valve spring according to claim 7, characterized in that: One end of the folded edge (16) extends to the end of the oblique section (18) away from the curled portion (14), and the other end of the folded edge (16) extends to the end of the abutting portion (13) away from the curled portion (14) with a gap between the folded edge (16) and the connecting portion (12). When the folded edge (16) is folded toward the inside of the curled portion (14), the extension section (19) abuts against and is fixed to the folded edge (16) located at the abutting portion (13).

9. The pilot valve spring according to claim 8, characterized in that: A pressing portion (17) is provided in the middle of the abutting portion (13) and protrudes downward from the abutting portion (13). The pressing portion (17) is used to abut against the upper end surface of the slider (2) in the pilot valve. When the folded edge (16) is folded toward the outside of the curled portion (14), the lower surface of the folded edge (16) is higher than the lower end of the pressing portion (17).

10. A pilot valve for a four-way reversing valve, comprising an electromagnet (3), a sleeve (4), a valve core (5), a spring (6), a valve seat (7), a slider (2) and a bracket (8); the electromagnet (3) is fixed on one end of the sleeve (4), the valve seat (7) is fixed on the side wall of the sleeve (4), the valve core (5) is arranged in the sleeve (4) between the electromagnet (3) and the valve seat (7) and can move along the axial direction of the sleeve (4), the spring (6) is arranged between the valve core (5) and the electromagnet (3), and the spring (6) is used to apply a thrust to the valve core (5) to move away from the electromagnet (3); one end of the bracket (8) is fixed to the end of the valve core (5) away from the spring (6), and the slider (2) is vertically movably arranged in the other end of the bracket (8); characterized in that: The pilot valve for the four-way reversing valve also includes a pilot valve spring as described in any one of claims 1 to 9, the fixing portion (11) is fixed to the end of the valve core (5) away from the spring (6), and the abutting portion (13) abuts against the upper end of the slider (2) and is used to apply a downward thrust to the slider (2) so that the lower end of the slider (2) abuts against the valve seat (7).