Pressing plate and plunger pump

Abstract

The utility model discloses a pressing plate and a plunger pump, and relates to the technical field of plunger pumps, and the pressing plate is used for being installed on the side, close to a plunger, of a swash plate; a groove is formed in the pressing plate, the first end of the groove is communicated with the end, facing the swash plate, of the pressing plate, and a lubricating medium is stored in the groove; the first end of the groove is communicated with the end, facing the swash plate, of the pressing plate, and the lubricating medium is stored in the groove, so that the lubricating medium in the groove can flow to the position between the swash plate and the pressing plate to serve as a lubricating layer, contact between the swash plate and the pressing plate is reduced or even avoided, friction between the swash plate and the pressing plate is reduced, and the service life of the swash plate is prolonged. Therefore, the service lives of the swash plate and the pressing plate are prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of plunger pumps, in particular to a pressing plate and a plunger pump. Background Art

[0002] In the prior art, the pressure plate in the plunger pump is used to fix the return plate and force the return plate to return. However, since the pressure plate is fixed to the swash plate, and as the swash plate continues to rotate, the swash plate and the pressure plate continue to rub against each other, causing the friction pair formed by the return plate and the swash plate to fail, thereby shortening the service life of the swash plate and the pressure plate.

[0003] Therefore, how to reduce the friction between the swash plate and the pressure plate and extend the service life of the swash plate and the pressure plate has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0004] The purpose of the utility model is to provide a pressing plate and a plunger pump, so as to reduce the friction between the swash plate and the pressing plate and prolong the service life of the swash plate and the pressing plate.

[0005] To achieve the above purpose, the present invention provides the following solutions:

[0006] The utility model provides a pressing plate, which is used to be installed on a side of a swash plate close to a plunger;

[0007] A groove is provided in the pressure plate, a first end of the groove is communicated with an end of the pressure plate facing the swash plate, and lubricating medium is stored in the groove.

[0008] Preferably, a first flow channel and a second flow channel are provided in the pressure plate;

[0009] The first end of the first flow channel is connected to the first end of the second flow channel, the second end of the first flow channel is used to inject a lubricating medium into the first flow channel, the groove is provided on the flow path of the first flow channel, the groove is connected to the first flow channel, and the first flow channel is connected to the second end of the groove;

[0010] A blocking member is provided at the second end of the second flow channel to prevent the lubricating medium from overflowing.

[0011] Preferably, the pressing plate includes a mounting area for mounting the return disc, the mounting area being provided on a first side of the pressing plate, and the mounting area being provided along the first side of the pressing plate;

[0012] A plurality of installation parts are staggeredly distributed in the installation area, and the installation parts are used to install the return disk in the installation area.

[0013] Preferably, nine mounting portions are provided in the mounting area, and the mounting portions include first mounting holes, wherein four of the first mounting holes are provided near the first end of the pressing plate, and the other five of the first mounting holes are provided near the second end of the pressing plate;

[0014] The angles between two adjacent first mounting holes in the four first mounting holes near the first end of the pressure plate are the same, and the angles between two adjacent first mounting holes in the five first mounting holes near the second end of the pressure plate gradually increase along the direction close to the first end of the pressure plate.

[0015] Preferably, the pressing plate further comprises a first fastener, the first fastener cooperates with the mounting portion, and the first fastener is used to fix the return disc in the mounting area;

[0016] The first fastener includes a rod portion passing through the return disc and the mounting portion in sequence, and a head portion connected to the rod portion and abutting against the mounting area;

[0017] The diameter of the head is larger than the aperture of the first mounting hole. A wear-resistant layer is provided on a side of the head close to the first mounting hole and a side of the mounting area facing the head.

[0018] Preferably, a plurality of second mounting holes are provided on the pressure plate, and the second mounting holes are used for second fasteners to pass through so as to fix the pressure plate to the swash plate.

[0019] Preferably, a third mounting hole for mounting the piston rod is provided on the opposite side of the second mounting hole, and an anti-falling groove is provided in the third mounting hole to prevent the piston from falling off.

[0020] Preferably, the pressing plate is further provided with a weight-reducing groove, and the weight-reducing groove is arranged in the non-working area of the pressing plate.

[0021] In addition, the utility model also provides a plunger pump, which includes the pressure plate.

[0022] Compared with the prior art, the utility model has achieved the following technical effects:

[0023] In the present invention, the first end of the groove is connected to the end of the pressure plate facing the swash plate, and a lubricating medium is stored in the groove, so that the lubricating medium in the groove can flow between the swash plate and the pressure plate to serve as a lubricating layer, thereby reducing or even avoiding contact between the swash plate and the pressure plate, reducing the friction between the swash plate and the pressure plate, and thus extending the service life of the swash plate and the pressure plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 is a top view of the pressure plate;

[0026] Figure 2 is a bottom view of the pressure plate;

[0027] Figure 3 is a schematic structural diagram of a first fastener;

[0028] Figure 4 Schematic diagram of the structure of the first oil channel and the second oil channel;

[0029] Figure 5 Schematic diagram of the distribution of the installation part;

[0030] Among them, 100, pressure plate; 101, first mounting through hole; 102, first mounting through hole; 103, pin hole; 104, groove; 105, mounting area; 106, mounting part; 107, third mounting hole; 108, weight reduction groove; 109, first flow channel; 110, sealing member mounting hole; 111, second flow channel; 200, first fastener; 201, head. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0033] like Figures 1 to 5As shown, the present invention discloses a pressure plate 100, which is mounted on the side of a swash plate near the plunger. A groove 104 is defined within the pressure plate 100, with a first end communicating with the end of the pressure plate 100 facing the swash plate. Lubricating medium is stored within the groove 104. In the present invention, the first end of the groove 104 communicates with the end of the pressure plate 100 facing the swash plate, and the lubricating medium is stored within the groove 104. This allows the lubricating medium within the groove 104 to flow between the swash plate and the pressure plate 100, serving as a lubricating layer. This reduces or even eliminates contact between the swash plate and the pressure plate 100, lowering friction between the two, and thereby extending the service life of the swash plate and the pressure plate 100.

[0034] Among them, not only a lubricating medium can be placed in the groove 104, but also a medium with both lubrication and heat dissipation properties, such as lubricating oil, can be injected; there are many forms of the medium, which can be a medium with both lubrication and heat dissipation properties, or two media with lubrication and heat dissipation properties can be injected separately. However, it should be noted that when injecting two media with lubrication and heat dissipation properties separately, it is necessary to confirm that the two media will not interfere with each other (for example, the two media react, resulting in a decrease or disappearance of one of the lubrication and heat dissipation properties). The shape of the groove 104 is not unique, such as Figure 1 As shown, it can be set to a special shape.

[0035] Furthermore, the present invention can either only provide the groove 104 and inject the lubricating medium directly into the channel, or provide a channel connected to the groove 104 and extend the channel to the outside of the pressure plate 100 to facilitate the injection of the lubricating medium. Figure 4 As shown, a first flow channel 109 and a second flow channel 111 are provided in the pressure plate 100; a first end of the first flow channel 109 is communicated with a first end of the second flow channel 111, and the second end of the first flow channel 109 is used to inject a lubricating medium into the first flow channel 109, a groove 104 is provided on the flow path of the first flow channel 109, and the groove 104 is communicated with the first flow channel 109, and the first flow channel 109 is communicated with the second end of the groove 104; a sealing member is provided at the second end of the second flow channel 111 to prevent the lubricating medium from overflowing.

[0036] The first flow channel 109 is configured so that the medium in the piston rod cavity can flow out into the first flow channel 109, and then flow from the first flow channel 109 through the groove 104 into the space between the swash plate and the pressure plate 100, achieving a lubricating (or lubricating + heat dissipating) effect. The second flow channel 111 is configured so that after entering the first flow channel 109, the oil can not only reach the groove 104, but also enter the second flow channel 111. That is, the second flow channel 111 plays a role in flow and pressure distribution, so that the oil will not violently impact the swash plate and the pressure plate 100, thus avoiding damage to the swash plate and the pressure plate 100. Figure 4As shown, the second flow channel 111 is arranged perpendicularly relative to the first flow channel 109, but the second flow channel 111 may not be arranged perpendicularly relative to the first flow channel 109. However, no matter how the second flow channel 111 is arranged, the second flow channel 111 must be connected to the first flow channel 109 to achieve the flow and pressure separation effect. The blocking member can be a screw that is twisted off, or other structure that can prevent the lubricating medium from overflowing, such as Figure 3 As shown, a blocking piece installation hole 110 for the blocking piece to enter is provided at one end of the first flow channel 109 away from the second flow channel 111. When the blocking piece is a twist-off screw, the blocking piece installation hole 110 is a twist-off screw installation hole.

[0037] like Figure 1 、 Figure 2 and Figure 5 As shown, the pressure plate 100 includes an installation area 105 for installing the return disc, and the installation area 105 is provided on the first side of the pressure plate 100, and the installation area 105 is provided along the first side of the pressure plate 100; a plurality of installation portions 106 are staggeredly distributed in the installation area 105, and the installation portion 106 is used to install the return disc into the installation area 105. The first side of the pressure plate 100 refers to the side of the pressure plate 100 close to the main shaft that can drive the swash plate to rotate. By providing a plurality of installation portions 106, the force on the return disc can be dispersed, so that the return disc will not be concentrated in a local area when subjected to external force, thereby avoiding the problems of stress concentration and uneven force, reducing damage to the return disc, and extending the service life of the return disc. The installation area 105 can specifically be an arc-shaped installation area 105. At this time, the installation area 105 matches the shape of the return disc, and the return disc can be better installed on the pressure plate 100. The mounting area 105 can be specifically a mounting plate. The mounting area 105 can be formed by extending the pressure plate 100 toward the first side of the pressure plate 100, or by connecting the pressure plate 100 without the mounting area 105 to the mounting area 105 through welding or other connection methods to obtain the pressure plate 100 with the mounting area 105. The staggered distribution means that the mounting portions 106 are unevenly and asymmetrically distributed within the mounting area 105, which further improves the effect of dispersing the force on the return plate and further reduces the potential damage to the return plate.

[0038] Furthermore, nine mounting portions 106 are provided in the mounting area 105 of the utility model, and the mounting portions 106 include first mounting holes, wherein four first mounting holes are arranged near the first end of the pressure plate 100, and the other five first mounting holes are arranged near the second end of the pressure plate 100; the angles between adjacent two of the four first mounting holes near the first end of the pressure plate 100 are the same, and the angles between adjacent two of the five first mounting holes near the second end of the pressure plate 100 gradually increase along the direction close to the first end of the pressure plate 100.

[0039] Specifically, the angle between two adjacent first mounting holes among the four first mounting holes near the first end of the pressure plate 100 can be 10°; the angle between two adjacent first mounting holes among the five first mounting holes near the second end of the pressure plate 100 can be 6°, 7°, 8°, and 9° respectively along the direction close to the first end of the pressure plate 100; the angle between the first mounting hole closest to the first end of the pressure plate 100 and the first mounting hole closest to the second end of the pressure plate 110 is 90°, and the angle between the fourth first mounting hole and the fifth first mounting hole in the direction from the first end of the pressure plate 100 toward the second end of the pressure plate 100 is 30°; based on the above settings, this further avoids the problem of uneven force on the return disk.

[0040] like Figure 3 As shown, the pressure plate 100 also includes a first fastener 200, which cooperates with the mounting portion 106 to fix the return disc in the mounting area 105; the first fastener 200 includes a rod portion that passes through the return disc and the mounting portion 106 in sequence, and a head portion 201 that is connected to the rod portion and abuts against the mounting area 105; the diameter of the head portion 201 is larger than the aperture of the first mounting hole, and a wear-resistant layer is provided on the side of the head portion 201 close to the first mounting hole and the side of the mounting area 105 facing the head portion 201.

[0041] The mounting portion 106 can be specifically a bolt hole, a through hole, a pin hole, or other structure that can cooperate with the first fastener 200 to install the return disc in the installation area 105; the first fastener 200 can be specifically a bolt, a screw, a pin, or other structure that can cooperate with the mounting portion 106 to install the return disc in the installation area 105; regardless of the structures of the first fastener 200 and the mounting portion 106, the two cooperate with each other. Mutual cooperation means that when the first fastener 200 is a bolt, the mounting portion 106 is a bolt hole that can install the bolt, and when the first fastener 200 is a screw, the mounting portion 106 is a mounting hole that can install the screw. When the first fastener 200 is a screw and the mounting portion 106 is a screw mounting hole that cooperates with the screw, the screw and the screw mounting hole can be installed in an interference fit, so that the return disc can be firmly installed in the installation area 105, that is, on the pressure plate 100. The head 201 of the first fastener 200 has a larger diameter, which increases the force-bearing area of the first fastener 200, so that the first fastener 200 is subjected to less pressure and is less susceptible to damage; the wear-resistant layer can be a paint layer coated on the head 201 of the first fastener 200 facing the installation area 105; or, when the first fastener 200 is made of a wear-resistant material, the wear-resistant layer is actually the side of the head 201 of the first fastener 200 facing the installation area 105. Specifically, the first fastener 200 can be made of copper; based on this, a wear-resistant friction pair is formed between the first fastener 200 and the return disk.

[0042] The pressure plate 100 of the present invention is provided with a plurality of second mounting holes, which are used for the second fasteners to pass through to fix the pressure plate 100 to the swash plate. The plurality of second mounting holes can be symmetrically arranged with the center line of the pressure plate 100 as the axis of symmetry, so that the force on the swash plate can be evenly distributed on the swash plate, and the force on the pressure plate 100 can be evenly distributed on the pressure plate 100. The second mounting holes can be pin holes, bolt holes or other structures that can cooperate with the second fasteners to fix the pressure plate 100 to the swash plate. Figure 1 As shown, the second mounting hole includes a first mounting through hole 101 and a second mounting through hole 102 symmetrically arranged, and a pin hole 103. The first mounting through hole 101 and the second mounting through hole 102 can be used to install bolts or screws, and the pin hole 103 is used to install a cylindrical pin. The pin hole 103 is not a through hole, and the pin hole 103 can be understood as a slotted hole.

[0043] like Figure 2 As shown, a third mounting hole 107 for mounting the piston rod is provided on the opposite side of the second mounting hole, and an anti-falling groove is provided in the third mounting hole 107 to prevent the piston from falling off.

[0044] The pressure plate 100 of the present invention is also provided with a weight reduction groove 108, which is provided in the non-working area of the pressure plate 100. The weight reduction groove 108 is provided in the non-working area of the pressure plate 100, which means that the setting of the weight reduction groove 108 will not affect the normal operation of the original function of the pressure plate 100.

[0045] Furthermore, the intermediate pressure plate 100 of the present invention eliminates the minimum displacement limit surface, which reduces the weight of the pressure plate 100 and increases the return force. This allows the plunger pump using the intermediate pressure plate 100 of the present invention to limit the minimum displacement of the plunger pump through the limit screw, thereby eliminating the need for the minimum displacement limit surface on the pressure plate 100. Figure 1 、 Figure 2 As shown, the pressure plate 100 in the present invention is a three-section structure, which enables the pressure plate 100 to fit more closely to the swash plate and the return plate.

[0046] In addition, the present invention also provides a plunger pump, which includes the pressure plate 100 described above. The plunger pump can be an axial swash plate type plunger pump or other plunger pumps using structures such as a swash plate, a return plate and a pressure plate.

[0047] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A pressing plate, characterized in that: The pressure plate is used to be installed on a side of the swash plate close to the plunger; A groove is provided in the pressure plate, a first end of the groove is connected to an end of the pressure plate facing the swash plate, and a lubricating medium is stored in the groove; The pressure plate is provided with a first flow channel and a second flow channel; The first end of the first flow channel is connected to the first end of the second flow channel, the second end of the first flow channel is used to inject a lubricating medium into the first flow channel, the groove is provided on the flow path of the first flow channel, the groove is connected to the first flow channel, and the first flow channel is connected to the second end of the groove; A blocking member is provided at the second end of the second flow channel to prevent the lubricating medium from overflowing.

2. The pressing plate according to claim 1, wherein The pressure plate includes a mounting area for mounting a return disc, the mounting area being provided on a first side of the pressure plate and being arranged along the first side of the pressure plate; A plurality of installation parts are staggeredly distributed in the installation area, and the installation parts are used to install the return disk in the installation area.

3. The pressing plate according to claim 2, wherein: Nine mounting portions are provided in the mounting area, each mounting portion including first mounting holes, four of which are located near the first end of the pressing plate, and the other five of which are located near the second end of the pressing plate; The angles between two adjacent first mounting holes in the four first mounting holes near the first end of the pressure plate are the same, and the angles between two adjacent first mounting holes in the five first mounting holes near the second end of the pressure plate gradually increase along the direction close to the first end of the pressure plate.

4. The pressing plate according to claim 3, wherein: The pressure plate further includes a first fastener, which cooperates with the mounting portion and is used to fix the return disc in the mounting area; The first fastener includes a rod portion passing through the return disc and the mounting portion in sequence, and a head portion connected to the rod portion and abutting against the mounting area; The diameter of the head is larger than the aperture of the first mounting hole. A wear-resistant layer is provided on a side of the head close to the first mounting hole and a side of the mounting area facing the head.

5. The pressing plate according to claim 1, wherein The pressure plate is provided with a plurality of second mounting holes, and the second mounting holes are used for second fasteners to pass through so as to fix the pressure plate to the swash plate.

6. The pressing plate according to claim 5, characterized in that A third mounting hole for mounting the piston rod is provided on the opposite side of the second mounting hole, and an anti-falling groove is provided in the third mounting hole to prevent the piston from falling off.

7. The pressing plate according to claim 1, wherein The pressing plate is further provided with a weight-reducing groove, which is arranged in the non-working area of the pressing plate.

8. A plunger pump, characterized in that: The plunger pump comprises the pressure plate according to any one of claims 1 to 7.

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