Pilot valve and four-way valve

Abstract

The application provides a pilot valve and a four-way valve, and the pilot valve comprises a guide valve sleeve, a magnetic concentrating sleeve made of a magnetic conducting material, the magnetic concentrating sleeve being sleeved on the guide valve sleeve, a static iron core arranged at one end in the guide valve sleeve, the end of the magnetic concentrating sleeve and the end of the static iron core being spaced apart in the axial direction of the guide valve sleeve, a coil assembly having a mounting cavity, the magnetic concentrating sleeve and a part of the guide valve sleeve being arranged in the mounting cavity, and the static iron core being arranged in the mounting cavity, and a moving iron core movably arranged in the guide valve sleeve, the magnetic concentrating sleeve surrounding the moving iron core. The technical scheme provided by the application can solve the problem of poor temperature rise effect of the magnetic concentrating sleeve on the pilot valve in the prior art.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic four-way valve technology, and more specifically, to a pilot valve and a four-way valve. Background Technology

[0002] Currently, for the pilot valve of the four-way valve in the prior art, since the pilot valve sleeve is usually made of stainless steel, the heat dissipation is poor and the temperature rise is high. Therefore, those skilled in the art mainly use a magnetic sleeve installed on the pilot valve sleeve. The magnetic sleeve is used in conjunction with a coil to increase the magnetic flux of the coil through the pilot valve sleeve, reduce the magnetic resistance, reduce the power, and thus reduce the temperature rise.

[0003] In the prior art, the magnetic sleeve of the pilot valve covers the stationary iron core of the pilot valve. During the operation of the pilot valve, the stationary iron core of the pilot valve will affect the increase of magnetic flux, thus limiting the ability of the magnetic sleeve and failing to effectively reduce the temperature rise. Summary of the Invention

[0004] This invention provides a pilot valve and a four-way valve to solve the problem of poor temperature rise reduction effect of the magnetic sleeve on the pilot valve in the prior art.

[0005] To address the aforementioned problems, according to one aspect of the present invention, a pilot valve is provided, comprising: a pilot valve sleeve; a magnetic sleeve made of a magnetically conductive material, the magnetic sleeve being sleeved on the pilot valve sleeve; a stationary iron core, one end of which is disposed within the pilot valve sleeve, the end of the magnetic sleeve and the end of the stationary iron core being spaced apart axially in the pilot valve sleeve; a coil assembly having a mounting cavity, the magnetic sleeve and a portion of the pilot valve sleeve passing through the mounting cavity, the stationary iron core being located within the mounting cavity; and a movable iron core, the movable iron core being movably disposed within the pilot valve sleeve, the magnetic sleeve being disposed around the movable iron core.

[0006] Furthermore, a spacer cavity is formed in the area between the end of the stationary iron core and the end of the magnetic sleeve, and the end of the moving iron core facing the stationary iron core is always located in the spacer cavity.

[0007] Furthermore, the pilot valve also includes: a support portion, on which the pilot valve sleeve is disposed; and a fixing member, one end of the magnetic sleeve being connected to the support portion via the fixing member.

[0008] Furthermore, the magnetic sleeve includes: a sleeve body, which is fitted onto the pilot valve sleeve, with a support portion and a stop fitting between the sleeve body; and a flange, which is disposed on the periphery of one end of the sleeve body, with a fastener connected to the support portion, and the fastener and the flange fitting together on the side of the flange away from the support portion.

[0009] Furthermore, the flange has a notch in the circumferential direction, which avoids the support and the fastener so that the fastener and the support fit together.

[0010] Furthermore, the fastener has a ring-shaped structure, is sleeved on the magnetic sleeve, and is welded to the support.

[0011] Furthermore, the magnetic sleeve has an assembly seam that extends through the magnetic sleeve and extends axially along the magnetic sleeve.

[0012] Furthermore, the support includes: a pilot valve bracket, a pilot valve sleeve disposed on the pilot valve bracket, the pilot valve bracket cooperating with a magnetic sleeve stop; a connector, the connector being connected to the pilot valve bracket, a fixing member cooperating with the magnetic sleeve stop, and the fixing member being connected to the connector.

[0013] Furthermore, the pilot valve support has an arc surface, and the outer wall of the pilot valve sleeve is matched with the arc surface for limiting; the connecting piece is located on the side of the pilot valve support away from the pilot valve sleeve.

[0014] According to another aspect of the present invention, a four-way valve is provided, the four-way valve including a main valve body and the aforementioned pilot valve, wherein the main valve body and the pilot valve are connected by a support portion.

[0015] The present invention provides a pilot valve, comprising: a pilot valve sleeve; a magnetic sleeve made of magnetically conductive material, which is fitted onto the pilot valve sleeve; a stationary iron core disposed at one end within the pilot valve sleeve, with the end of the magnetic sleeve and the end of the stationary iron core spaced apart axially along the pilot valve sleeve; a coil assembly having a mounting cavity, in which the magnetic sleeve and a portion of the pilot valve sleeve pass through, and the stationary iron core is located within the mounting cavity; and a movable iron core movably disposed within the pilot valve sleeve, with the magnetic sleeve surrounding the movable iron core. This design, with a gap between the magnetic sleeve and the stationary iron core, prevents the magnetic sleeve from being fitted onto the outer periphery of the stationary iron core. Thus, the effective length is defined from the point where the magnetic sleeve enters the coil assembly to the end of the magnetic sleeve extending into the coil assembly. This avoids the stationary iron core affecting the increase in magnetic flux when using the pilot valve, thereby affecting the use of the magnetic sleeve. With this configuration, during the operation of the pilot valve, the magnetic sleeve will work with the coil assembly to increase the magnetic flux and reduce the magnetic resistance, thereby better driving the moving iron core to move, thus reducing the power of the pilot valve and improving the effect of reducing temperature rise. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0017] Figure 1 A schematic diagram of the structure of the four-way valve provided in an embodiment of the present invention is shown;

[0018] Figure 2 It shows Figure 1 A cross-sectional view of the four-way valve in the image;

[0019] Figure 3 It shows Figure 2 A magnified view of the selected location;

[0020] Figure 4 It shows Figure 1 A schematic diagram of the structure of the magnetic sleeve in the pilot valve;

[0021] Figure 5 It shows Figure 1 A schematic diagram of the structure of the fixing component in the pilot valve.

[0022] The above figures include the following reference numerals:

[0023] 10. Support section; 11. Pilot valve bracket; 12. Connector; 13. Main valve bracket; 21. Pilot valve sleeve; 22. Static iron core; 23. Moving iron core; 24. Spacing cavity; 25. Elastic element; 30. Magnetizing sleeve; 31. Sleeve body; 32. Flanged edge; 33. Notch; 34. Assembly seam; 40. Fixing element; 50. Coil assembly; 51. Mounting cavity; 60. Main valve body. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0025] like Figures 1 to 5 As shown, an embodiment of the present invention provides a pilot valve, comprising: a pilot valve sleeve 21; a magnetic sleeve 30 made of magnetically conductive material, which is sleeved on the pilot valve sleeve 21; a stationary iron core 22, one end of which is disposed within the pilot valve sleeve 21, wherein the end of the magnetic sleeve 30 and the end of the stationary iron core 22 are spaced apart along the axial direction of the pilot valve sleeve 21; a coil assembly 50 having a mounting cavity 51, wherein the magnetic sleeve 30 and a portion of the pilot valve sleeve 21 pass through the mounting cavity 51, and the stationary iron core 22 is located within the mounting cavity 51; and a movable iron core 23, which is movably disposed within the pilot valve sleeve 21, with the magnetic sleeve 30 surrounding the movable iron core 23.

[0026] In this embodiment, the stationary iron core 22 is fixedly disposed at one end of the pilot valve sleeve 21. There is a gap between the magnetic sleeve 30 and the stationary iron core 22, preventing the magnetic sleeve 30 from being fitted over the outer periphery of the stationary iron core 22. Thus, the effective length W is the portion from the point where the magnetic sleeve 30 enters the coil assembly 50 to the end of the magnetic sleeve 30 extending into the coil assembly 50. This avoids the stationary iron core 22 affecting the increase of magnetic flux when using the pilot valve, thereby affecting the use of the magnetic sleeve 30. With this configuration, during the use of the pilot valve, the magnetic sleeve 30 cooperates with the coil assembly 50 to increase the magnetic flux and reduce the magnetic resistance, thereby better driving the moving iron core 23 to move, thus reducing the power of the pilot valve and improving the temperature rise reduction effect. The magnetic sleeve 30 mainly increases the magnetic flux through its effective length W.

[0027] The coil assembly 50 includes an electromagnetic coil and a coil frame. The electromagnetic coil is wound around the magnetic sleeve 30 along the circumference of the magnetic sleeve 30. The coil frame is arranged along the circumference of the magnetic sleeve 30 and is sleeved on the outer side wall of the magnetic sleeve 30. The electromagnetic coil is wound around the coil frame along the circumference of the magnetic sleeve 30. The mounting cavity 51 is located inside the coil frame.

[0028] Furthermore, the outer wall of the magnetic sleeve 30 is fitted with the inner wall of the mounting cavity 51, and one end of the pilot valve sleeve 21 abuts against the bottom wall of the mounting cavity 51. This arrangement limits the position of the pilot valve sleeve 21, increasing the stability and reliability of the pilot valve.

[0029] Optionally, the material of the magnetic sleeve 30 is silicon steel sheet type material, such as B20AT1500, or other materials with good magnetic permeability, such as ST12, DC01, SPCC, SUS430 or Cr12, to ensure the magnetic permeability of the magnetic sleeve 30.

[0030] Alternatively, the magnetic sleeve 30 is prone to rust, and can be maintained by electroplating to prevent rust.

[0031] like Figure 2 As shown, the area between the end of the stationary iron core 22 and the end of the magnetic sleeve 30 forms a spacer cavity 24, and the end of the moving iron core 23 facing the stationary iron core 22 is always located within the spacer cavity 24. In this embodiment, the spacer cavity 24 is located axially on the pilot valve sleeve 21, at the right end of the magnetic sleeve 30 and the left end of the stationary iron core 22. During the operation of the pilot valve, the end of the moving iron core 23 facing the stationary iron core 22 always reciprocates within the spacer cavity 24. In this region, the magnetic flux within the pilot valve is relatively large, which leads to a decrease in magnetic resistance, thereby reducing power and temperature rise.

[0032] The pilot valve also includes an elastic element 25, which is disposed inside the pilot valve sleeve 21. The elastic element 25 is located between the stationary iron core 22 and the moving iron core 23. The moving iron core 23 has a mounting groove. One end of the elastic element 25 is disposed in the mounting groove and abuts against the bottom surface of the mounting groove. The other end of the elastic element 25 is connected to the stationary iron core 22. The automatic reset of the moving iron core 23 is achieved through the elastic element 25, thereby improving the performance and efficiency of the pilot valve.

[0033] like Figure 1 As shown, the pilot valve also includes: a support part 10, on which the pilot valve sleeve 21 is disposed; and a fixing member 40, one end of the magnetic sleeve 30 being connected to the support part 10 via the fixing member 40.

[0034] In this embodiment, the support portion 10 and the magnetic sleeve 30 are connected by a fastener 40, thereby limiting the axial movement of the magnetic sleeve 30 and fixing it onto the pilot valve sleeve 21. This solution achieves the connection between the magnetic sleeve 30 and the support portion 10 through the fastener 40, thus fixing the magnetic sleeve 30 onto the pilot valve sleeve 21. This reduces the number of mating steps involved in installing the magnetic sleeve 30, making its installation easier and improving reliability and stability.

[0035] like Figure 4 As shown, the magnetic sleeve 30 includes: a sleeve body 31, which is sleeved on the pilot valve sleeve 21, and a support part 10 and a stop engagement with the sleeve body 31; a flange 32, which is disposed on the periphery of one end of the sleeve body 31, and a fixing member 40 is connected to the support part 10, and the fixing member 40 and the flange 32 are engaged with the side opposite to the support part 10.

[0036] In this embodiment, the sleeve 31 is fitted onto the pilot valve sleeve 21. The support portion 10 and the sleeve 31 engage with a stop to axially limit the sleeve 31. Further axial limitation of the sleeve 31 is achieved through the engagement of the fixing member 40 and the stop on the side of the flange 32 facing away from the support portion 10. The fixing member 40 is then connected to the support portion 10. This configuration allows the magnetic sleeve 30 to engage with the fixing member 40 and the stop on the support portion 10 in two axial directions, thereby defining the position of the magnetic sleeve 30 on the pilot valve sleeve 21. The magnetic sleeve 30 can have a small axial displacement on the pilot valve sleeve 21, which depends on the distance between one end of the sleeve 31 engaging with the stop on the support portion 10 and the support portion 10. This embodiment effectively determines the position of the magnetic sleeve 30 on the pilot valve sleeve 21, ensuring the reliability and stability of the installation of the magnetic sleeve 30.

[0037] Specifically, the flange 32 has a notch 33 in the circumferential direction, which avoids the support 10 and the fastener 40, thus preventing the flange 32 from blocking the fastener 40 so that the fastener 40 and the support 10 fit together.

[0038] In this embodiment, since the flange 32 is located on the periphery of one end of the sleeve 31, during the installation of the magnetic sleeve 30 with the fixing member 40 onto the valve guide sleeve 21, if the flange 32 is a complete annular structure, the flange 32 will first engage with the stop of the support part 10, and the fixing member 40 will not engage with the stop of the support part 10. Therefore, a notch 33 is opened in the circumferential direction of the flange 32 to avoid the support part 10 and the fixing member 40. With this configuration, during the installation of the magnetic sleeve 30 with the fixing member 40 onto the valve guide sleeve 21, the notch 33 will avoid the support part 10 and the fixing member 40, making it easier for the support part 10 and the fixing member 40 to fit together.

[0039] Furthermore, the fixing member 40 has a ring-shaped structure and is sleeved on the magnetic sleeve 30. The fixing member 40 and the support part 10 are welded together. In this embodiment, the fixing member 40 is sleeved on the magnetic sleeve 30, so that the fixing member 40 and the magnetic sleeve 30 can be mutually limited in the circumferential direction. The contact parts of the fixing member 40 and the support part 10 are connected together by welding, which results in a stable, reliable, and high-strength connection.

[0040] In this design, the fixing member 40 engages with the end of the flange 32 that is away from the support portion 10, and the fixing member 40 is sleeved on the magnetic sleeve 30, that is, the fixing member 40 is sleeved on the sleeve body 31. A portion of the end of the fixing member 40 that engages with the flange 32 is in contact with the support portion 10, and then the in contact portion of the fixing member 40 and the support portion 10 are welded together. The axial displacement of the magnetic sleeve 30 is restricted by the fixing of the fixing member 40.

[0041] Specifically, the magnetic sleeve 30 has an assembly seam 34 extending through the magnetic sleeve 30 along its axial direction. In this embodiment, by providing the assembly seam 34, the magnetic sleeve 30 can undergo a certain elastic deformation in the radial direction, which facilitates the fitting of the magnetic sleeve 30 onto the pilot valve sleeve 21, making installation convenient and the structure simple.

[0042] like Figure 1 As shown, the support part 10 includes: a pilot valve bracket 11, a pilot valve sleeve 21 disposed on the pilot valve bracket 11, the pilot valve bracket 11 and the magnetic sleeve 30 stop cooperation; a connector 12, the connector 12 is connected to the pilot valve bracket 11, the fixing part 40 and the magnetic sleeve 30 stop cooperation, and the fixing part 40 is connected to the connector 12.

[0043] In this embodiment, the support portion 10 includes a valve guide bracket 11 and a connector 12 connected to each other. One end of the magnetic sleeve 30 is engaged with the stop of the valve guide bracket 11, that is, one end of the upper sleeve body 31 of the magnetic sleeve 30 is engaged with the stop of the valve guide bracket 11. The fixing member 40 is engaged with the stop of the magnetic sleeve 30, that is, the fixing member 40 is engaged with the end of the upper flange 32 of the magnetic sleeve 30 that is away from the support portion 10. The fixing member 40 is then connected to the connector 12, thus fixing the magnetic sleeve 30 between the valve guide bracket 11 and the fixing member 40, thereby fixing the magnetic sleeve 30 on the valve guide sleeve 21. This arrangement limits the position of the magnetic sleeve 30 on the valve guide sleeve 21. The valve guide bracket 11, the connector 12, and the fixing member 40 limit the axial direction of the magnetic sleeve 30 on the valve guide sleeve 21, further ensuring the reliability and stability of the installation of the magnetic sleeve 30.

[0044] Optionally, the pilot valve bracket 11 and the connector 12 can be fixed by welding, which ensures a reliable and stable connection and facilitates processing.

[0045] Furthermore, the pilot valve support 11 has an arcuate surface, and the outer wall of the pilot valve sleeve 21 is fitted with the arcuate surface for limiting. The connecting piece 12 is located on the side of the pilot valve support 11 away from the pilot valve sleeve 21. This arrangement makes the support of the pilot valve support 11 for the pilot valve sleeve 21 more reliable, and the connecting piece 12 is connected to the pilot valve support 11 to support the pilot valve support. Optionally, the connecting piece 12 is a plate-like structure, and there are two connecting pieces 12, each connected to the pilot valve support 11, without affecting each other. Alternatively, the connecting piece 12 can also be a hollow frame structure, with at least one end face of the connecting piece 12 connected to the pilot valve support 11. This arrangement saves materials and simplifies the structure.

[0046] Optionally, the connection between the pilot valve bracket 11 and the pilot valve sleeve 21 can be made by welding, which ensures a reliable and stable connection.

[0047] like Figure 1 and Figure 2 As shown, another embodiment of the present invention provides a four-way valve, which includes a main valve body 60 and the aforementioned pilot valve. The main valve body 60 and the support portion 10 of the pilot valve are connected. The support portion 10 of the pilot valve is connected to the main valve body 60 to connect the main valve body 60 and the pilot valve sleeve 21 of the pilot valve.

[0048] The pilot valve support 10 also includes a main valve bracket 13. The main valve bracket 13 and the pilot valve bracket 11 are connected together by a connector 12. The main valve bracket 13 and the connector 12 can be welded together, and the main valve bracket 13 and the main valve body 60 can also be welded together. The connection is stable and reliable, so as to ensure the stability and reliability of the four-way valve.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pilot valve, characterized in that, include: Pilot valve sleeve (21); A magnetic sleeve (30) is made of magnetically conductive material and is fitted onto the valve sleeve (21). A stationary iron core (22) is disposed at one end inside the guide valve sleeve (21). In the axial direction of the guide valve sleeve (21), the end of the magnetic sleeve (30) and the end of the stationary iron core (22) are spaced apart. A coil assembly (50) having a mounting cavity (51), a portion of the magnetic sleeve (30) and the valve sleeve (21) passing through the mounting cavity (51), and a stationary iron core (22) located within the mounting cavity (51); A moving iron core (23) is movably disposed within the valve sleeve (21), and a magnetic sleeve (30) is disposed around the moving iron core (23). The region between the end of the stationary iron core (22) and the end of the magnetic sleeve (30) forms a spacer cavity (24), and the end of the moving iron core (23) facing the stationary iron core (22) is always located in the spacer cavity (24); The pilot valve further includes: a support (10), on which the pilot valve sleeve (21) is disposed; and a fixing member (40), one end of the magnetic sleeve (30) being connected to the support (10) through the fixing member (40). The magnetic sleeve (30) includes: a sleeve body (31), which is sleeved on the valve guide sleeve (21), and the support part (10) and the sleeve body (31) are in a stop-fitting relationship; a flange (32), which is disposed on the periphery of one end of the sleeve body (31), and the fixing member (40) is connected to the support part (10), and the fixing member (40) and the flange (32) are in a stop-fitting relationship on the side away from the support part (10).

2. The pilot valve according to claim 1, characterized in that, The flange (32) has a notch (33) in the circumferential direction, the notch (33) avoiding the support (10) and the fastener (40) so that the fastener (40) and the support (10) fit together.

3. The pilot valve according to claim 1, characterized in that, The fixing member (40) is a ring structure. The fixing member (40) is sleeved on the magnetic sleeve (30). The fixing member (40) and the support part (10) are welded together.

4. The pilot valve according to claim 1, characterized in that, The magnetic sleeve (30) has an assembly seam (34) that extends through the magnetic sleeve (30) and the assembly seam (34) extends axially along the magnetic sleeve (30).

5. The pilot valve according to claim 1, characterized in that, The support portion (10) includes: A guide valve bracket (11) is provided on the guide valve bracket (11), and the guide valve sleeve (21) is engaged with the magnetic sleeve (30) for a stop. The connector (12) is connected to the valve support (11), the fixing member (40) and the magnetic sleeve (30) are in a stop cooperation, and the fixing member (40) is connected to the connector (12).

6. The pilot valve according to claim 5, characterized in that, The valve support (11) has an arc surface, and the outer wall of the valve sleeve (21) is limited to the arc surface; the connector (12) is disposed on the side of the valve support (11) away from the valve sleeve (21).

7. A four-way valve, characterized in that, The four-way valve includes a main valve body (60) and a pilot valve as described in any one of claims 1 to 6, wherein the main valve body (60) and the support portion (10) of the pilot valve are connected.

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